Entries |
Document | Title | Date |
20080212418 | OPTICAL DISC DEVICE - According to one embodiment, an optical head device provides a signal processing circuit which sets a control amount to move an objective lens so that a distance between the objective lens and a given recording layer of the an optical disc coincides with a focal position, an optical path length correction mechanism which corrects an influence of an aberration component producing an error in the focal distance, a thickness difference detection circuit which finds an amount of correction to be made by the optical path length, and an aberration correction circuit which generates a correction signal to correct the influence of the aberration component producing the error in the focal distance detected by the thickness difference detection circuit, and supplies the correction signal to the optical path length correction mechanism. | 09-04-2008 |
20080225656 | Cross-Talk Cancellation in Three-Spots Push-Pull Tracking Error Signal in Optical Disc Systems - A method and system for cross-talk cancellation in a three-spots push-pull tracking error signal in an optical disc system is disclosed. A tracking error signal (TES) is determined from a plurality of error signals (PP | 09-18-2008 |
20080253240 | METHOD AND SYSTEM FOR CALIBRATING RECORDING TRACK OFFSET OF OPTICAL STORAGE DEVICE - A method for calibrating a recording track offset of an optical storage device accessing an optical storage medium of a land and groove recording/reproduction type includes: setting at least one control parameter of a track offset control loop of the optical storage device to drive the track offset control loop to enter an first state; and recording data onto the optical storage medium with the track offset control loop being enabled to derive the latest value of the recording track offset, where the track offset control loop is utilized for controlling the recording track offset. The method further includes setting the control parameter to drive the track offset control loop to enter a second state, where a loop response of the track offset control loop in the first state is different from that in the second state. | 10-16-2008 |
20080253241 | Optical pickup - An optical pickup includes an objective lens for focusing a light beam onto an optical disc surface, a bobbin for supporting the objective lens, the bobbin having a first side face and a second side face on the opposite side of the bobbin with respect to the first side face, a first pair of suspension wires and a second pair of suspension wires, each wire having a first end and a second end, each of the first pair of suspension wires being attached to the first side face of the bobbin at the first end, and each of the second pair of suspension wires being attached-to the second side face of the bobbin at the first end, and a base to which each of the first and second pair of suspension wires is attached at the second end, for supporting the bobbin so that the bobbin can swing on the base. The first and second pair of suspension wires are plated in accordance with at least one different plating requirement between the first pair of suspension wires and the second pair of suspension wires. | 10-16-2008 |
20080267024 | Optical Storage System Method for Improving Reliability Thereof - A method and system for improving reliability in an optical storage system ( | 10-30-2008 |
20080279059 | Method and System For Correction of Errors - A method and system for removing periodic disturbances pertaining to turntable and spindle motor errors during recording of a blank optical information carrier. The periodic disturbances are determined in advance and removed only during recording by a repetitive control/learning feedforward control circuit ( | 11-13-2008 |
20080285398 | Tracking Error Signal Calibration Method, and Disc Drive Implementing Such Method - A method for generating a calibration value for a tracking error signal in an optical disc drive comprises the steps of performing a plurality of N jumps towards respective target tracks of an optical disc inserted in said optical disc drive; in each jump, calculating a one-jump normalization value; calculating a multi-jump calibration value on the basis of the plurality of N one jump normalization values obtained from the respective jumps. A control signal for controlling the radial actuator of the optical disc drive is generated on the basis of a normalized tracking error signal, which is calculated on the basis of the tracking error signal and the multi jump calibration value. | 11-20-2008 |
20080285399 | Recorder, Player, and Recorder/Player - An apparatus according to the present invention includes a write compensation section, which generates a write signal to write information on an information storage medium, and a writing section for irradiating the information storage medium with a pulsed beam based on the write signal generated by the write compensation section. The information storage medium includes a recording layer, which has an optical constant that changes continuously with the total quantity of light received. The writing section radiates and condenses multiple pulsed beams on the recording layer at an interval that is shorter than the diameter of the pulsed beams on the recording layer. The write compensation section generates the write signal such that the each sum of variations in the optical constant at each irradiated spot of the pulsed beam on the recording layer through the end of a write operation forms a predetermined variation pattern. | 11-20-2008 |
20080298183 | Method and Device for Tilt Compensation In an Optical Storage System - The invention relates to a tilt controller for controlling the tilt (radial and/or tangential) of an actuator relative to a recording surface of an optical storage medium, compensation for the radial to tilt crosstalk being effected by feeding a filtered version of the radial control signal (r) into the tilt branch, and/or compensation for the focus to tilt crosstalk being effected by feeding a filtered version of the focus control signal (f) into the tilt branch. | 12-04-2008 |
20080310263 | COMPENSATION VALUE SETTING DEVICE AND COMPENSATION VALUE SETTING METHOD - A compensation value setting device selects, based on the first and second index values calculated by the first and second index value calculation sections for each combination of the spherical aberration compensation value and the lens' position compensation value, one combination of the spherical aberration compensation value and the lens' position compensation value and then sets the selected combination for correcting the spherical aberration and the position of the objective lens. | 12-18-2008 |
20090003152 | OPTICAL DISC APPARATUS, CONTROLLER OF OPTICAL DISC APPARATUS, AND CONTROL METHOD OF OPTICAL DISC APPARATUS - According to one embodiment, an optical disc apparatus, includes an offset addition section configured to add an offset amount to the electric signal output from each of a photo receiving elements in accordance with a first signal, a gain variable section configured to adjust a gain amount of each offset added electric signal obtained by adding an offset in accordance with a second signal, an A/D converter configured to convert each of the offset added electric signals to a digital signal from an analog signal, a servo signal arithmetic section configured to generate an error signal used for focus and tracking servo control from the digital signal, a reference signal generation section configured to generate the first signal and the second signal from the digital signal, and a gain/offset correction section configured to correct the error signal in accordance with the first signal and the second signal. | 01-01-2009 |
20090016180 | OPTICAL PICKUP APPARATUS - An optical pickup apparatus aiming at reduction of adverse effect on a tracking control signal and a data signal by preventing the reflected light from the adjacent layers of a multilayer disc changing to a stray light. In this optical pickup apparatus, the reflected light from the optical disc including the stray light from the adjacent layer is once focused with a focusing lens and is then reflected with the reflection plate. A flat attenuation element is provided between the lens and the reflection plate parallel to the optical axis with inclusion of the optical axis under the condition separated from the reflection plate. The reflection plate reflects the reflected light from the relevant layer and the attenuation element shields the reflected light from the adjacent layer. The light returning to the focusing lens includes less influence of the stray light. This light is detected with a detector to become a control signal and a data signal. | 01-15-2009 |
20090028011 | Optical disk device - An optical disk as disclosed herein includes, among other things, a summing module that sums a compensation signal to a predetermined signal in a servo loop. The compensation signal compensates for a periodical disturbance input into a servo system of the optical disk device in units of a rotation angle of the disk rotating module. A phase lead imparting module imparts a predetermined amount of phase lead to an output signal from an optical detector module and outputs the predetermined amount of phase lead as the compensation signal. The predetermined amount of phase lead is determined in accordance with the rotation period information. The optical disk device performs an accurate iterative learning control to provide stable servo performance. The iterative learning control is performed such that the signal having imparted an optimal amount of phase lead in accordance with the rotation period information is added to the servo loop. | 01-29-2009 |
20090046547 | SYSTEM, METHOD, AND APPARATUS FOR CHARACTERIZING, TRACKING, AND SEGREGATING KNOWN DEFECTIVE DISK REGIONS ON PATTERNED DISKS - A system for tracking and segregating repeated defects on media disks as tabled data in disk drives is disclosed. The disks have the same defects as the sub-master from which they are formed. Likewise, the sub-masters have the same defects as the master from which they are formed which, in turn, are passed down to the disks themselves. This information is recorded in the disk drives to avoid read/write operations in the affected sectors of the disks. In addition, the order and production quantities of sub-masters and disks made are tracked since replication performance decays over time. | 02-19-2009 |
20090046548 | OPTICAL HEAD APPARATUS AND OPTICAL INFORMATION RECORDING/REPRODUCING APPARATUS - An optical head apparatus of an optical information recording/reproducing apparatus is provided with a light source. An objective lens focuses an output light emitted by said light source on a disc optical recording medium for which a groove or a pit for tracking is provided. T photo-detector receives a reflected light reflected by said optical recording medium. A polarizing splitter unit splits said output light and said reflected light. A quarter-wave plate disposed between said polarizing splitter section and said objective lens. A birefringence compensating unit reduces a change in an amplitude of a track error signal caused by birefringence in a protective layer of said optical recording medium. | 02-19-2009 |
20090046549 | OPTICAL DISC DEVICE, CROSSTALK CORRECTION METHOD, AND INTEGRATED CIRCUIT - When a focus error signal (FE signal) is detected with an astigmatic method, a track crossing component leaks into the FE signal. Another detection method for the FE signal would reduce the leaking signal, but is not applicable when the light use efficiency decreases. An optical crosstalk correction amount determination unit ( | 02-19-2009 |
20090052287 | DISC CONTROL DEVICE - To obtain a construction in which unnecessary learning can be avoided and optimal and stable positioning control can be carried out upon introducing a repetition control method in an optical disc device. | 02-26-2009 |
20090059744 | OPTICAL DISC ACTUATOR CONTROL - An optimizing of a gain in a servo control loop ( | 03-05-2009 |
20090059745 | OPTICAL PICKUP DEVICE AND INFORMATION RECORDING/PLAYBACK APPARATUS - The present invention provides an optical pickup device and an information recording/playback apparatus capable of correcting aberration of an optical beam in correspondence with a plurality of recording formats of optical disks while realizing miniaturization of the device and the apparatus and reduction in manufacturing cost. | 03-05-2009 |
20090073826 | OPTICAL DEVICE FOR SCANNING AN INFORMATION CARRIER - An optical scanning device for scanning an information carrier. The device includes an array optical element arranged to generate an array of radiation spots from an incident radiation beam, for the scanning of the information carrier. The device further includes an aberration optical element arranged to apply a predetermined optical aberration to the radiation for correction of optical aberration in the radiation spots. | 03-19-2009 |
20090086593 | OPTICAL DISC APPARATUS - For achieving an improvement on recording/reproducing quality of information, with enabling more adequate tilt adjustment, even for an optical disc to be used under a circumstance having a large temperature change, an optical disc apparatus for conducting recording or reproducing of video information onto/from the optical disc | 04-02-2009 |
20090097366 | OPTICAL DISC APPARATUS AND LENS SHIFT CORRECTION METHOD OF OPTICAL DISC APPARATUS - An optical disc apparatus includes a first lens shift amount detection unit which detects a first lens shift amount for a objective lens, on the basis of a push-pull signal which is generated in a state in which a main body of the optical disc apparatus is horizontally disposed, a memory unit which stores the first lens shift amount which is detected by the first lens shift amount detection unit, a second lens shift amount detection unit which detects a second lens shift amount for the objective lens on the basis of the push-pull signal at a time of recording/reproduction on/from an optical disc, and an addition unit which constantly adds to a tracking actuator of the objective lens a lens shift corresponding to a difference between the first lens shift amount stored in the memory unit and the second lens shift amount. | 04-16-2009 |
20090097367 | OPTICAL AXIS SHIFT CORRECTING DEVICE AND METHOD, AND COMPUTER PROGRAM - An optical axis shift correcting device is provided in an optical information device including irradiation means ( | 04-16-2009 |
20090109811 | OPTICAL DISK APPARATUS, CONTROL METHOD, AND PROGRAM - An optical disk apparatus driving an optical disk includes a tilt-angle adjusting unit configured to adjust a tilt angle indicating the tilt of an optical axis of laser light emitted from a pickup to detect an optimal tilt angle at which a traverse signal has the maximum amplitude and a storing unit configured to store information about the optimal tilt angle. When the optical disk has multiple recording layers on one side, the tilt-angle adjusting unit adjusts the tilt angle with respect to each of the multiple recording layers to detect the optimal tilt angle and the storing unit stores information about the optimal tilt angle with respect to each of the multiple recording layers. The tilt angle with respect to each of the multiple recording layers is controlled in accordance with the information about the optimal tilt angle with respect to each of the multiple recording layers. | 04-30-2009 |
20090109812 | OPTICAL DISC DEVICE - An object of this invention is to measure the tilt quantity of, and perform a tilt control on, an optical disc accurately without depending on the rotation control method. | 04-30-2009 |
20090116348 | OFF-TRACK DETECTION CIRCUIT - In a state where vibration is constantly detected, a protection function by a vibration detection circuit loses effectiveness, and thereby there may possibly arise a malfunction of an off-track detection circuit due to a pseudo-generated off-track signal. An off-track detection circuit which is capable of preventing malfunction due to a pseudo-generated off-track signal and of maintaining stable reproduction even when being under vibration, is provided by constructing the circuit not to judge as off-track when a reproduction synchronization signal is detected. | 05-07-2009 |
20090122663 | Optical Disk Device - The optical disc apparatus according to the present invention includes a tilt detecting means; a coma aberration correcting means; and a spherical aberration correcting means. Based on the result of a tilt detection, the amount of the correction performed by the coma aberration correcting means is determined so that the amount of correction is constant for the whole circumference of an optical disc, and then a spherical aberration is corrected by the spherical aberration correcting means. Thus, it is possible to correct the spherical aberration that has occurred due to the coma aberration correcting means, while the tilt margin is secured, thereby improving the reliability of reproduction and recording by the optical disc apparatus. Further, the optical disc apparatus according to the present invention is configured, in the case where a thermal shock tilt has occurred during the activation of the apparatus, to wait until the thermal shock tilt has settled. Thus, it is possible to perform the activation while the influence of the thermal shock tilt is avoided, thereby improving the reliability of the recording and reproduction operations by the optical disc apparatus. | 05-14-2009 |
20090122664 | Optical disc apparatus and spherical aberration correcting method - An optical disc apparatus corrects spherical aberration by moving a movable lens along an optical axis direction. A spherical aberration correcting method in the optical apparatus includes: a step to obtain data which relates to a most appropriate adjusted position of the movable lens in the optical disc apparatus utilizing an optical discs for condition setting and to store the data in advance; a step to calculate the distance from the surface of the optical disc that is loaded in the optical disc apparatus to the information recording layer; a step to obtain difference of the distance between the calculated distance and distance that the optical disc should have as specified in standard, with respect to the distance from the surface of the optical disc that is loaded in the optical disc apparatus to the information recording layer; and a step to perform correction of the spherical aberration such that the most appropriate adjusted position which corresponds to the optical disc that is loaded in the optical disc apparatus is shifted in a distance which is substantially the same as the difference of distances that is obtained. | 05-14-2009 |
20090129218 | OPTICAL DISK DEVICE - There is provided an optical disk device in which no deterioration in playability at resisting vibrations in a disk servo system is generated by inadvertently recognizing it is in a non-vibrating state irregardless of it is in a vibrating state in a disk servo system. By providing two threshold values of a threshold value for detecting a vibration state during a non-vibration state and a threshold value for detecting the non-vibration state during the vibration state, or by performing a filtering to an error signal using a filter having filter constants different between during the vibrating state and during the non-vibrating state, it is possible to prevent erroneous recognition of the non-vibration state and thereby to prevent deterioration in playability of the disk servo during resisting earthquake. | 05-21-2009 |
20090135685 | ABERRATION CORRECTING APPARATUS AND PROGRAM FOR CORRECTING ABERRATION - An aberration correcting apparatus is provided, which is capable of suppressing occurrence of abnormal operation in an actuator for a tracking servo by reducing track cross noise caused by astigmatism in a 45-degree direction in which influence is exerted on the tracking servo. | 05-28-2009 |
20090135686 | OFFSET COMPENSATION METHOD FOR LASER POWER CONTROL CIRCUIT - A method for compensating the offset of a laser power control circuit, which predetermines a fixed reference voltage, adjusts the offset voltage by adding the reference voltage, outputs a summed voltage to a pick-up head, tries to ignite the pick-up head, detects the voltage of the pick-up head, checks whether the detected voltage rises to a specific threshold voltage, continues adjusting the offset voltage if the detected voltage has not risen to the specific threshold voltage and records the offset voltage if the detected voltage has risen to the specific threshold voltage, and configures the offset voltage to be the voltage offset compensation for the laser power control circuit, thereby eliminating feature differences of different pick-up heads of the laser power control circuit. | 05-28-2009 |
20090147632 | OPTICAL DISC DRIVE APPARATUS - In an optical disc drive apparatus, when a start time of a tracking pull-in operation is adjusted according to the eccentricity amount of the optical disc, a suitable starting point of the tracking pull-in operation can be always captured and the pull-in operation of the tracking control can be stably performed, without depending on the eccentricity amount of the optical disc. Further, the eccentricity amount and an eccentricity phase are detected from a track zero crossing signal before the tracking pull-in, and an eccentricity compensation signal of the track is added to the tracking control signal. As a result, also in the optical disc with the large eccentricity amount, the tracking pull-in operation can be stably performed. | 06-11-2009 |
20090154309 | NEAR-FIELD GAP PULL-IN METHOD AND OPTICAL DISC APPARATUS THEREFOR - A gap pull-in method and an optical disc apparatus. Whether light condensed on a disc as an actuator ascends is near-field light is determined using a gap error signal. The range of an actuator driving voltage value during a section where the decrease rate of the gap error signal is constant is obtained when it is determined that the light condensed on the disc is near-field light. Gap pull-in is performed on the disc during a section where the actuator driving voltage value is within the obtained range. | 06-18-2009 |
20090154310 | OPTICAL PICKUP APPARATUS - An optical pickup apparatus comprising: a laser diode emitting laser light having a first wavelength; an objective lens focusing the laser light having the first wavelength emitted from the laser diode to each signal recording layer of a first optical disc for which the laser light having the first wavelength is specified as laser light for reproducing a signal and a second optical disc for which laser light having a second wavelength different from the first wavelength is specified as laser light for reproducing a signal; and a spherical aberration correction element disposed in an optical path between the laser diode and the objective lens, the spherical aberration correction element correcting each spherical aberration of the first optical disc and the second optical disc to reproduce a signal recorded in each signal recording layer of the first optical disc and the second optical disc. | 06-18-2009 |
20090154311 | Pre-Filter For A Servo Control Loop, And Applications Thereof - A method, system and computer program product to control position of an error control module in a lithography apparatus using a servo control loop is described herein. The system comprises a filter, a servo controller coupled to the filter and configured to receive a control signal and an actuator coupled to the servo controller and configured to control the position of the error control module. The filter is configured to filter the control signal by modulating the amplitude and phase of the control signal in a desired frequency range, prior to the servo control loop. | 06-18-2009 |
20090154312 | Drive Signal Generation Circuit - A drive signal generation circuit comprising: a tracking signal output circuit to output a tracking signal based on an error signal indicating a track deviation of laser light output from the optical pickup relative to a track, the tracking signal being a signal for driving a motor to move an optical pickup in a radial direction of an optical disc to reduce the track deviation of the laser light; a stop signal output circuit to output a stop signal for driving the motor to stop moving the optical pickup in the radial direction; and a switch circuit to output the tracking signal as a drive signal for driving the motor when a level of an output signal from the optical pickup is higher than a predetermined level, and to output the stop signal as the drive signal when the level of the output signal is lower than the predetermined level. | 06-18-2009 |
20090154313 | Optical Disc Apparatus - In servo control within an optical disc apparatus, when iterative learning control is started, the servo characteristics are modified to servo characteristic giving increased gains during a given period of time. Under this condition, the iterative learning control is provided. | 06-18-2009 |
20090161505 | INFORMATION RECORDING APPARATUS AND METHOD, INFORMATION REPRODUCING APPARATUS AND METHOD, AND COMPUTER PROGRAM - An information recording apparatus ( | 06-25-2009 |
20090168615 | PARAMETER ADJUSTING METHOD AND DATA RECORDING/REPRODUCING DEVICE - A high-density land/groove recording method is provided which records random data used for parameter adjustment on either adjacent three grooves or adjacent three lands of an optical disk. The recorded data is reproduced, the radial tilt is first adjusted based on PRSNR of the reproduction data, and thereafter parameters are adjusted one by one in the order of focus offset, recording power and track offset. The recording power may be adjusted first. | 07-02-2009 |
20090168616 | SPHERICAL ABERRATION COMPENSATION METHOD OF OPTICAL STORAGE DEVICE - A spherical aberration compensation method of an optical storage device is provided. The method includes: deriving a first spherical aberration compensation value corresponding to a first track position on a recording layer of an optical storage medium to serve as a first reference value; deriving a second spherical aberration compensation value corresponding to a second track position on the recording layer of the optical storage medium to serve as a second reference value; and estimating a third spherical aberration compensation value corresponding to a third track position on the recording layer of the optical storage medium according to the first and second reference values. | 07-02-2009 |
20090180362 | Method and Apparatus for Deciding Spherical Aberration Compensation Value - A method and an apparatus for deciding a spherical aberration compensation (SAC) value for an optical storage medium are provided. The optical storage medium comprises at least one recording layer and a cover layer. The SAC value is suitable for a selected one of the at least one recording layer. First, a focus search on the optical storage medium is performed to derive a focus error (FE) signal in response to a testing SAC value. Then, a center level and a center basis corresponding to the testing SAC value according to the FE signal is determined. The SAC value according to the center level, the center basis, and the testing SAC value is also determined. When the center level and the center basis are equal, the SAC value is determined to be the testing SAC value. | 07-16-2009 |
20090185462 | Focus Controller and Focus Control Method - A focus controller and a focus control method are provided. The method allows the optical access apparatus focus from a current data layer onto a target layer. Each of the current layer and the target layer corresponds to a Spherical Aberration Compensation (SAC) value and a focus error related parameter. The method adjusts the SAC value in use to a temporary SAC value, adjusts the focus error related parameter in use to a temporary focus error related parameter, focuses on the target layer, adjusts the focus error related parameter in use to the focus error related parameter corresponding to the target layer, and adjusts the SAC value in use to the focus error related parameter corresponding to the target layer. | 07-23-2009 |
20090185463 | DIFFRACTION GRATING, OPTICAL PICKUP DEVICE AND OPTICAL DISC APPARATUS - A pickup device splits and detects a light beam reflected from a disc with the use of a grating. The grating has first to six areas, wherein the first area and the second area, the third area and the fifth area, and the fourth area and the sixth area are arranged in point symmetry with respect to the center of the grating, respectively. The first area is interposed between the fourth area and the fifth area and the second area is interposed between the third area and the sixth area. Further, the centers of the first area and the second area are arranged to be spaced by a distance d in a direction perpendicular to the displacement direction of the optical pickup device. Even though the center of an optical disc is not located on a straight line in the displacement direction of the optical pickup device, objective lens can obtain a stable servo signal. | 07-23-2009 |
20090190449 | OPTICAL HEAD TRANSFER DEVICE, INTEGRATED CIRCUIT FOR OPTICAL HEAD TRANSFER DEVICE, FOCUSING LENS DRIVING DEVICE, AND INTEGRATED CIRCUIT FOR FOCUSING LENS DRIVING DEVICE - When transferring an optical head in a radial direction of an optical disc, the optical head is initially transferred with a speed profile of a larger acceleration, and when abnormality is detected by an abnormality detection circuit which detects abnormality of a focus control system, the optical head is again transferred with a speed profile of a smaller acceleration, whereby preventing a movable part of a lens actuator from colliding with a fixed part when transferring the optical head in the radial direction of the optical disc, resulting in an optical head transfer device, an integrated circuit for the optical head transfer device, a focusing lens driving device, and an integrated circuit for the focusing lens driving device which can avoid an increase in the start-up time of the device, a reduction in the data reading speed from the optical disc, and the like. | 07-30-2009 |
20090190450 | OPTICAL ELEMENT, ABERRATION CORRECTING ELEMENT, LIGHT CONVERGING ELEMENT, OBJECTIVE OPTICAL SYSTEM, OPTICAL PICKUP DEVICE, AND OPTICAL INFORMATION RECORDING REPRODUCING DEVICE - An optical system for use in an optical pickup apparatus comprises a first optical surface having a superposition type diffractive structure including a plurality of ring-shaped zones which are formed concentrically around an optical axis, wherein each ring-shaped zone is composed of a plurality of stepped sections stepwise, and a second optical surface having a diffractive structure including a plurality of ring-shaped zones which are formed concentrically around an optical axis, wherein each of the plurality of ring-shaped zones are divided by a stepped section to generate a diffractive light ray of diffractive order whose absolute value is not small than 1 for the light flux. | 07-30-2009 |
20090201776 | OPTICAL INFORMATION RECORDING DEVICE AND RECORDING CORRECTION CALCULATION METHOD - When recording recording information by forming on a recording medium a recording mark whose mark length is an integral multiple of the reference mark length according to a recording signal generated from a recording information signal, this method performs a process of: generating, after recording compensation recording information on the recording medium, a reproduction signal by reading out the compensation recording information; generating from the reproduction signal a reproduction clock whose cycle corresponds to the reference mark length; setting a signal level suitable for binarization determination of the reproduction signal as a distribution reference level, according to the difference in variation between white and black levels of the reproduction signal; and calculating the recording correction value for correcting the compensation recording signal, so that the reproduction signal becomes closer to the distribution reference level around a target cross timing determined based on the reproduction clock. | 08-13-2009 |
20090201777 | OPTICAL PICKUP APPARATUS, REPRODUCING APPARATUS, RECORDING APPARATUS, AND TRACKING ERROR SIGNAL GENERATION METHOD - An optical pickup apparatus, a reproducing apparatus, a recording apparatus, and a tracking error signal generation method are provided. Four light-receiving elements receive stray light of main and sub beams reflected from, out of a plurality of recording layers of the optical disk, the one other than that for effecting recording or reproduction. The four light-receiving elements are disposed individually near every side of the four-part split light-receiving element, of which light-receiving elements are disposed between the two-part split light-receiving elements. Based on stray-light intensity detected by the four light-receiving elements, intensity distribution is calculated for tracking-error signal correction. | 08-13-2009 |
20090213705 | OPTICAL DISC DEVICE - The optical disc device has a circuit | 08-27-2009 |
20090213706 | OPTICAL PICKUP APPARATUS - An optical pickup apparatus comprising: a laser diode; an objective lens configured to focus laser light emitted from the laser diode on a signal recording layer of an optical disc; a first aberration correction element arranged in an optical path between the laser diode and the objective lens; and a second aberration correction element arranged in the optical path between the laser diode and the objective lens and having an aberration correction speed lower than the aberration correction speed of the first aberration correction element, the first aberration correction element and the second aberration correction element being selectively operated according to the required aberration correction speed. | 08-27-2009 |
20090245040 | OPTICAL DISC REPRODUCING APPARATUS AND OPTICAL DISC REPRODUCING METHOD - An optical disc reproducing apparatus according to the present invention includes an optical pickup for receiving a reflection signal from an optical disc having a land and a groove, an error signal creation unit for creating a tracking error signal from the reflection signal, a polarity switching unit arranged to switch the polarity of the tracking error signal, and a servo processing unit for performing a tracking servo process using the tracking error signal output from the polarity switching unit and creating a drive signal of a tracking actuator provided with the optical pickup, and the polarity switching unit switches the polarity of the tracking error signal in a reproduction state in which the optical disc is reproduced and in a waiting state in which the reproduction is interrupted. According to the optical disc reproducing apparatus, even if a reproduction laser beam is continuously radiated in the waiting state, deterioration of a recording film of a recording type optical disc can be prevented as well as a transition between the waiting state and the reproduction state can be securely performed in a short time. | 10-01-2009 |
20090245041 | SYSTEM FOR PREVENTING EXCESSIVE SKIPPING ON AUDIO DISKS - The present invention provides for a method for reducing undesirable skipping during playback of a compact disc in a compact disc player. A lens system of the compact disc player reads audio data and subcode data from the compact disc. The subcode data includes Q channel bits and P channel bits. The actual time lapse of the compact disc playback is calculated from the Q channel bits and the P channel bits, while a target time lapse is calculated based on data received from a real-time clock. The difference between the two time lapse values is calculated, and if the differences is greater than a predetermined threshold, the lens system is repositioned to read the audio data from the compact disc corresponding to a predetermined time interval in advance of the current position of the lens system. | 10-01-2009 |
20090252003 | OPTICAL RECORDING/REPRODUCING APPARATUS AND FOCUS SEARCH METHOD - Disclosed is an optical recording/reproducing apparatus capable of performing focus search with high reliability even when a wavefront aberration occurs due to a thickness of a protective layer of an optical disk. The optical recording/reproducing apparatus comprises: an optical system which focuses the beam spot into the recording medium; a spot moving section which moves the beam spot at least in a direction parallel to thickness of the protective layer; a surface detector which detects each of a surface of the protective layer and one or more signal recording surfaces based on a returning light; and a focus controller which starts focusing servo control with respect to the one or more signal recording surfaces when the surface detector detects the surface of the protective layer and thereafter detects the one or more signal recording surfaces. | 10-08-2009 |
20090274022 | OPTICAL DISC DEVICE - A focus error signal is generated by a first-order diffracted light diffracted by regions | 11-05-2009 |
20090290457 | OPTICAL FOCUS ERROR OFFSET TO REDUCE RADIAL TO VERTICAL CROSSTALK - A method and system are provided for minimizing or optimising radial to vertical crosstalk (RVC) in an error signal in an optical record carrier reader is record carrier losed. Focus error offset values are applied to the reader. The radial to vertical crosstalk is determined after each focus error offset value is applied. The focus error offset value which minimizes or optimises the radial to vertical crosstalk is selected for use by the reader. | 11-26-2009 |
20090296543 | DRIVE CONTROL APPARATUS, DRIVE CONTROL METHOD AND OPTICAL PICKUP APPARATUS - A control unit is caused to drive a collimator lens from a position of an origin, by a clock number A of drive pulses of a pulse rate T | 12-03-2009 |
20090303847 | OPTICAL DISC APPARATUS THEREFOR - There is a need to accurately lock focus of a laser beam onto a target data layer of a multilayer optical disc. The above need can be addressed by, for example, performing a focus lock operation after a spherical aberration correction amount is set in such a way as to make smaller the ratio of the focus error signal waveform amplitude at the data layer adjacent to a target data layer through which a laser beam passes earlier than through the target data layer to the focus error signal waveform amplitude at the target data layer than that when the spherical aberration correction amount is set so as to be optimal for the target data layer. | 12-10-2009 |
20090316539 | OPTICAL HEAD AND OPTICAL DISK APPARATUS - There are provided an interference type optical head and an optical disk apparatus, which have a signal amplification effect and which can be manufactured in sizes comparable to conventional optical heads. In an optical disk apparatus that performs signal amplification by making a light, which is used as a reference light without being irradiated on an optical disk and, interfere with reflected light from the optical disk, a corner cube prism that reflects the reference light is mounted on the same actuator as an objective lens. Further, there is provided a movable portion that adjusts the optical path length of the interfering light in accordance with the kind of optical disk being read and the recording layer being read. A wedge prism may be used for the movable portion, and a spherical aberration correction lens and an optical path length adjusting component may be moved integrally. Thus, a stable amplification effect may be obtained while keeping the overall size comparable to conventional apparatuses. | 12-24-2009 |
20090316540 | OPTICAL DISC APPARATUS AND CONTROL METHOD THEREOF - The present invention provides an optical disc apparatus that reduces access time while suppressing the emanation of heat from a beam expander. A microcomputer manages the operation time and pause time of a stepping motor constructed to move the movable lens of the beam expander, and in accordance with the duration of an immediately previous pause, limits the number of successive stepping-motor driving actions following the pause time, below a maximum permissible count. When the pause duration is shorter than a threshold value or when the number of successive stepping-motor driving actions reaches the maximum permissible count, the microcomputer starts next driving of the stepping motor after a required waiting time. | 12-24-2009 |
20090323483 | Acting Track-Crossing During Tracking Error Adjust - A method for enhancing the optical initializing operation comprises: sending a radial error signal from an optical pick-up unit to a radial error signal calibration unit; sending the radial error signal from the optical pick-up unit to an offset adjuster; sending a calibrated radial error signal from the radial error signal calibration unit to the offset adjuster and a gain adjuster; sending a radial actuator (RA) signal from the radial error signal calibration unit to activate a radial actuator during an initialization or a period for calculating RE signal calibrating parameters. | 12-31-2009 |
20100008196 | ABERRATION CORRECTING APPARATUS - In optical disc systems, read-out is hampered because of spherical aberrations resulting from cover layer thickness variations or because discs consists of multiple layers. The aberration correcting apparatus ( | 01-14-2010 |
20100020651 | Optical disk reproduction apparatus and optical disk reproduction method - Deterioration of error rate at reproduction time is prevented even if a photodetector with a poor characteristic is included. An optical pickup unit ( | 01-28-2010 |
20100027385 | ABERRATION CORRECTING DEVICE, OPTICAL HEAD, AND OPTICAL DISC APPARATUS - An aberration correcting device includes: a first transparent electrode; a second transparent electrode; and a liquid crystal layer disposed between the first transparent electrode and the second transparent electrode, having refractive index varying according to an electric field applied to the liquid crystal layer, wherein the first transparent electrode has a first circular dividing line and a second circular dividing line formed outside the first circular division line arranged to be concentric with the second circular dividing line, and wherein a region between the first circular dividing line and the second circular dividing line is radially divided by plural radial dividing lines. | 02-04-2010 |
20100027386 | OPTICAL PICKUP APPARATUS, FOCAL-POINT ADJUSTING METHOD, AND OPTICAL DISC APPARATUS - An optical pickup apparatus is provided with an angle adjusting element. The angle adjusting element changes a propagation direction of luminous fluxes of four luminous flux regions set about an optical axis of the laser light, out of laser light reflected by a disc, and mutually disperses the luminous fluxes. A signal light region in which signal light only is present appears on a detecting surface of a photodetector. A sensor pattern for signal light is placed at a position irradiated with the signal light within this region. A sensor pattern for a coma aberration detection is placed on an inner side of this region. | 02-04-2010 |
20100034061 | OPTICAL STORAGE APPARATUS AND CONTROL CHIP FOR ACCESSING AN OPTICAL DISC AND METHOD THEREOF - An optical storage apparatus includes an optical pickup head, a drive module, a spherical aberration compensator, and a controller module. The drive module is coupled to the optical pickup head for performing a predetermined operation associated with the optical pickup head. The spherical aberration compensator is coupled to the optical pickup head for performing a spherical aberration compensation upon the optical pickup head. The controller module is coupled to the drive module and the spherical aberration compensator for controlling the drive module to perform the predetermined operation during a first period of time and the spherical aberration compensator to perform the spherical aberration compensation during a second period of time. The first period of time overlaps the second period of time. | 02-11-2010 |
20100074066 | SERVO SYSTEM OF OPTICAL DISC AND RELATED SERVO METHOD - The present invention discloses a servo system of an optical storage device, the optical storage device includes a pick-up unit for detecting signals reflected from an optical disc to generate a plurality of detecting signals, the servo system includes: a focus error signal generating module coupled to the pick-up unit for generating a plurality of focus error signals according to the detecting signals; a focus servo control module coupled to the focus error signal generating module for generating a focus control signal according to the focus error signals; and a focus actuator coupled to the focus servo control module and the pick-up unit for controlling the pick-up unit to adjust a focus position on the optical disc according to the focus control signal. | 03-25-2010 |
20100074067 | OPTICAL DISK DRIVING APPARATUS, OPTICAL DISK DRIVING SYSTEM, VEHICLE EQUIPPED WITH OPTICAL DISK DRIVING SYSTEM, METHOD OF CORRECTING SPHERICAL ABERRATION IN OPTICAL DISK DRIVING APPARATUS, PROGRAM AND RECORDING MEDIUM - An optical disk driving apparatus includes an optical head device having a laser light source, a converging optical system converging a light beam emitted by the laser light source onto an optical disk, a photo detector receiving reflected light reflected by the optical disk, and an aberration correcting optical system controlling aberration of the converging optical system; a motor rotating the optical disk; and a control section receiving a signal from the photo detector, wherein the converging optical system has an objective lens formed using resin as a main material, the aberration correcting optical system has a spherical aberration correcting element correcting spherical aberration, and the control section evaluates quality of a reproduction signal for information in the optical disk by using the reflected light received by the photo detector, and utilizes a result of the evaluation to perform closed loop control on the spherical aberration correcting element. | 03-25-2010 |
20100074068 | CORRECTING TEMPERATURE CHARACTERISTIC OF OPTICAL PICKUP OF AN OPTICAL DISK RECORDING/REPRODUCING APPARATUS - There is a need to provide correction of a temperature characteristic of an optical pickup of an optical disk recording/reproducing apparatus, in which items of the optical pickup including spherical aberration may be improved in temperature characteristic. To achieve the need, an optical disk drive is characterized by correcting a spherical aberration correction element when variation of a signal from the control circuit to the driver and/or a tracking or focusing error signal supplied to the controller has a value equal to or more than a predetermined value. | 03-25-2010 |
20100074069 | Optical Disk Device and Tilt Correction Method Thereof - There are provided an optical disk device and tilt correction processing method for performing recording/reproduction by rapidly acquiring an optimal tilt correction value for an optical disk having a plurality of recording/reproducing layers. In an optical disk device capable of recording or reproducing information by irradiating a laser beam to each of a plurality of recording/reproducing layers of an optical disk, the tilt value is stepwise set within a predetermined range at a predetermined radius position of the recording/reproducing layer located at the farthest distance from the laser beam irradiation side so that an optimal tilt correction value can be obtained from the quadratic function by the method of least squares of the jitter or the like obtained from the disk. By applying the optimal tilt value obtained to the other recording/reproducing layer, it is possible to start recording or reproduction in a short time. | 03-25-2010 |
20100080093 | OPTIMIZING FOCUS POINT FOR OPTICAL DISC - An apparatus includes a first circuit and a second circuit. The first circuit may be configured to generate status signals and an error signal in response to accessing a storage medium. The error signal provides a first value based on an accuracy of accessing the storage medium. The second circuit may be configured to offset the first value of the error signal to a second value to increase the accuracy of accessing said storage medium. The status signals include one or more of a data signal and a differential signal. In a first mode, an offset signal is generated in response to the data signal. In a second mode, the offset signal is generated in response to the differential signal. | 04-01-2010 |
20100103784 | OPTICAL DISC APPARATUS - An optical disc apparatus reliably executes a seek operation even if an optical disc is warped. Tilt adjustment values spanning from the inner circumference to the outer circumference of an optical disc are stored. When seeking from a start address to a destination address, a tilt adjustment value A at the start address and a tilt adjustment address C at the destination address are not directly used. A tilt adjustment value k·C (k<1) is used during a coarse seek operation until the neighborhood of the destination address and a tilt adjustment value C is used during a fine seek operation from the neighborhood of the destination address to the destination address. | 04-29-2010 |
20100118671 | TILT CONTROL METHOD, INTEGRATED CIRCUIT AND OPTICAL DISC DEVICE - There is provided an optical disc drive including a light axis deviation detection means ( | 05-13-2010 |
20100124153 | OPTICAL PICKUP AND OPTICAL INFORMATION REPRODUCING DEVICE - An optical pickup and an optical information recording and reproducing device in which spherical aberration correction control after a disc is loaded can be efficiently made in a short time. Before an information recording medium is loaded into a drive, an optical axis direction position of a concave lens is preset to a state so as to optimize a converging spot on a recording surface of a single-layered medium of as a first recording medium or a predetermined layer (first layer having a substrate thickness of 0.1 mm) of a medium having two or more layers to which the recording/reproduction is executed by a laser light source. After the information recording medium is loaded, if it is determined to be a second (third) recording medium to which the recording/reproduction is executed by a laser light source, setting of the optical axis direction position of the concave lens is changed. | 05-20-2010 |
20100128581 | OPTICAL DISK DRIVE AND METHOD FOR DRIVING A FEEDING DEVICE OF AN OPTICAL DISK DRIVE - The invention provides an optical disk drive. In one embodiment, the optical disk drive comprises a feeding device, a power driver, and a controller. The feeding device comprises a spherical aberration (SA) lens and a stepping motor, wherein the SA lens corrects spherical aberration of a light beam emitted by a pickup head, and the stepping motor moves the SA lens according to a plurality of control signals. The power driver generates the control signals to drive the stepping motor to move the SA lens. The controller directs the power driver to drive the stepping motor to move the SA lens with only stable steps when the SA lens is required to move, so that the stepping motor is in a stable state without inducing step errors after the stepping motor rotates with the stable steps. | 05-27-2010 |
20100135130 | OPTICAL PICKUP AND OPTICAL INFORMATION PROCESSING DEVICE - A disclosed optical pickup includes an aberration correction unit with a phase shifter surface. On the phase shifter surface, rectangular or staircase-like steps are formed in a concentric manner around an optical axial center, in certain regions where a light beam passes through. The steps have different heights in the optical axial direction. A light beam having a wavelength of 405 nm is directly transmitted through the steps so that a phase difference is applied for correcting spherical aberration that occurs on a first optical recording medium. A light beam that passes through an annular region without any steps is focused on a second optical recording medium. A light beam that passes through an outside region is focused by an object lens on the second optical recording medium, and is not focused on the first optical recording medium. | 06-03-2010 |
20100172223 | Optical Disk Apparatus - A servo control of an optical disk apparatus increases a suppression degree of an iterative learning control system, against a frequency disturbance of integer multiple of rotation frequency in a predetermined rotation phase range including a range, in which a servo deviation is detected, of the rotation phase. | 07-08-2010 |
20100195456 | OPTICAL DISC CONTROL DEVICE - There is provided an optical disc control device which can perform stable repetitive control without deteriorating the followability of a target value when performing jumping, retry, and long seek. The optical disc control device comprises an adder which receives a compensation target signal having a periodic frequency component, which is read out from an optical disc; a filter which outputs a signal component included in an arbitrarily determined learning frequency band in the output signal of the adder; a memory which successively updates and stores the output signal of the filter; a gain element which multiplies signal information outputted from the memory by a gain which is not less than 0 and not larger than 1, and inputs the product to the adder; a rotation speed detector which detects the rotation speed of the optical disc; a disc position detector which detects the position of the pickup on the optical disc; a circumferential direction move amount calculator which calculates the move amount of the pickup in the circumferential direction on the optical disc; and a memory controller which control the addresses for reading out the signal information stored in the memory on the basis of the circumferential direction move amount which is calculated by the circumferential direction move amount calculator. | 08-05-2010 |
20100195457 | OPTICAL DISC SIGNAL PROCESSING DEVICE, OPTICAL DISC SIGNAL PROCESSING METHOD, OPTICAL DISC REPRODUCTION AND RECORDING DEVICE, AND OPTICAL DISC REPRODUCTION AND RECORDING METHOD - An optimum method for adjusting the physical position or angle of an optical pickup (a | 08-05-2010 |
20100202258 | Optical Disk Drive and Operation Method Thereof - An optical disk drive includes a pickup apparatus and a servo error correction unit. The pickup apparatus reads data recorded on an optical disk or records encoded data on the optical disk. The pickup apparatus includes a servo control unit. The servo error correction unit generates, based upon data read by the pickup apparatus, a tilt control signal to correct the tilt of the pickup apparatus generated as a result of the eccentricity of the optical disk and the tilt of the optical disk,. The servo control unit of the pickup apparatus controls the tilt of the optical disk and the tilt of the pickup apparatus in response to the tilt control signal. | 08-12-2010 |
20100232266 | RECORDING/REPRODUCING APPARATUS AND ADJUSTMENT METHOD THEREFOR - A recording/reproducing apparatus includes: a light source; a first correction section to correct a position of an objective lens that collects laser light from the light source on a surface of an optical disc based on a focus bias setting value obtained from a focus bias value; a second correction section to correct an aberration of the laser light based on an aberration correction setting value obtained from an aberration correction value; an evaluation value generation section to generate an evaluation value; a focus bias adjustment section to change plus/minus of the focus bias value and calculate a new focus bias value based on the evaluation value every time a first cycle passes; and an aberration adjustment section to change plus/minus of the aberration correction value and calculate a new aberration correction value every time a second cycle passes, in parallel with an update of the focus bias value. | 09-16-2010 |
20100246343 | OPTICAL DISC DEVICE, OPTICAL HEAD, AND INFORMATION PROCESSING DEVICE - An object of the invention is to provide an optical disc device, an optical head, and an information processing device that enable to advantageously record or reproduce information with respect to an information recording medium having three or more information recording surfaces with light transmissive layers of different thicknesses from each other. Assuming that an aberration amount of third-order coma aberration resulting from tilting a multilayer optical disc ( | 09-30-2010 |
20100260018 | Optical Disk Apparatus with an Improved Track Jump Performance - An optical disk device for recording or reproducing an optical disk has: an objective lens for irradiating a laser beam to the optical disk; an actuator for moving the objective lens in the radial direction of the optical disk; and a spindle motor for rotating the optical disk. After the laser beam irradiated to the optical disk passed through a PID portion of the optical disk, the actuator moves the objective lens in the radial direction of the optical disk at a timing corresponding to a rotational speed. Between signals to drive the actuator, an output time of a deceleration signal is set to a predetermined ratio of a time during which an acceleration signal is outputted. While the deceleration signal is outputted, a light spot passes through the PID portion. | 10-14-2010 |
20100265804 | FOCUS JUMP METHOD FOR OPTICAL DISK DEVICE AND MULTI-LAYER DISK - An optical disk device for recording/reproducing information on/from a multi-layer optical disk moves a light focusing point for several layers by one focus jump. The optical disk device includes a controller to detect a level of a focus error signal to change an output level of a focus drive signal, and the controller changes timing to change the output level of the focus drive signal based on the number of layers for the focus jump. | 10-21-2010 |
20100302920 | Optical Disk Drive and Program Therefor - Provided is an optical disk drive including: an actuator for driving an objective lens for applying a beam from a laser to an optical disk to cause a focal point of the beam to move in a focus direction; and a servo controller for receiving an input of a focus error signal and driving the actuator to control a focusing position of the beam, which includes: a compensation unit for generating a drive signal for the actuator based on the focus error signal; a noise detection unit for detecting a noise component by changing a limiter characteristic according to a frequency of the drive signal; and a correction unit for correcting the drive signal by subtracting the noise component from the drive signal. Accordingly, an influence of a tracking error signal leaking into the focus error signal in a focus servo system can be reliably suppressed. | 12-02-2010 |
20100315912 | OPTICAL DISC DEVICE - An optical disc device includes: a first searching part which searches a condition where amplitude level of a TE signal is made maximum by changing either one of position of a movable lens and a focus balance value in a state where a focus servo control is performed based on a FE signal; an adjusting line setting part which sets an adjusting line that has an inclination α which is preliminarily stored in a memory portion and that passes the position of the movable lens and the focus balance value both of which are searched by the first searching part; and a second searching part which changes the position of the movable lens and the focus balance value to plural values on the adjusting line in a state where the focus servo control is performed consecutively to search a condition where the amplitude level of the tracking error signal is made maximum. | 12-16-2010 |
20100315913 | Method for Controlling Layer Changes for an Optical Disk Drive - A method for controlling layer changes for an optical disk drive is provided, where a focus of a laserbeam emitted by a pickup head of the optical disk drive is moved from a current data layer of a disk to a target data layer of the disk. First, a position of a collimator lens of the pickup head is adjusted for spherical aberration correction. The objective lens is then lowered to a low position to move the focus of the laserbeam off the surface of the disk. The objective lens is then raised towards the disk. A focusing error signal is generated while the objective lens is being raised. Whether a target S-curve corresponding to the target data layer is present in the focusing error signal is then started to be detected. If the target S-curve is detected, the focus on operation on the target data layer of the disk is successful. | 12-16-2010 |
20110038239 | OPTICAL DISC APPARATUS AND RECORDING METHOD - A recorded area is reproduced during a suspension of a recording operation; when degradation of the recorded signal is detected (S | 02-17-2011 |
20110058459 | METHOD AND DEVICE FOR ADJUSTING TILT OF RECORDING MEDIUM - A tilt control method of a recording medium comprises fixing the recording medium to a recording reproducing apparatus; performing first tilt compensation in a state that the recording medium is stopped; and performing second tilt compensation in a state that the recording medium in which the first tilt compensation has been performed is rotated. | 03-10-2011 |
20110075528 | OPTICAL DISC APPARATUS - An optical disc apparatus for shortening time necessary for adjustment while maintaining an accuracy of a result of adjustment, determines “A” pieces (A≧1, A03-31-2011 | |
20110075529 | OPTICAL DISC APPARATUS, FOCUS CONTROL METHOD AND INTEGRATED CIRCUIT - An optical disc apparatus has: a spherical aberration correction unit ( | 03-31-2011 |
20110096647 | Optical Disc Apparatus - An optical disc apparatus including means for calculating a spherical aberration correction quantity of an object lens, reproduced information signal generation means and spherical aberration correction means conducts spherical aberration correction, finds a spherical aberration correction quantity suitable for another layer by calculation on the basis of the obtained spherical aberration correction quantity, and sets the correction quantity as an initial correction quantity of spherical aberration correction. An optical disc apparatus including tilt correction quantity calculation means, reproduced information signal generation means and tilt adjustment means conducts tilt adjustment, finds a tilt correction quantity suitable for another layer by calculation on the basis of the obtained tilt correction quantity, and sets the correction quantity as an initial correction quantity of tilt adjustment. | 04-28-2011 |
20110103204 | METHOD AND APPARATUS FOR COMPENSATING FOR DEFECT OF STORAGE MEDIUM - An apparatus for compensating for a defect of a storage medium of an optical driving includes a memory to store sample values of a servo driving signal during at least one track sampled by a first signal and cycle information about the first signal; a servo driving signal estimator to estimate a servo driving signal during at least one next track using the sample values, the cycle information about the first signal, and cycle information based on a second signal; and a transmitter to transmit the servo driving signal estimated by the servo driving signal estimator to a servo driver of the optical driving device during a defect section of the storage medium; wherein the first signal is synchronized with a radial direction of the storage medium; and the second signal has a frequency higher than the first signal. | 05-05-2011 |
20110103205 | OPTICAL DISC APPARATUS AND TRACKING CONTROL METHOD - An optical disc apparatus of the present application has a lens position signal generator for generating a lens position signal representative of a position of an objective lens in a disc radial direction, an amplitude corrector for correcting an amplitude of a tracking error signal, and a tracking controller for generating an actuator drive signal for controlling an actuator, from an output of the amplitude corrector, wherein the amplitude corrector corrects an amplitude of the tracking error signal in accordance with the lens position signal to make approximately constant a tracking error detection sensitivity relative to a displacement between an optical spot and a track. | 05-05-2011 |
20110110206 | OPTICAL DISK DEVICE - Proposed is an optical disk device capable of optimally adjusting a current value of a direct current and a high frequency superimposed current for driving a laser diode. This optical disk device includes a laser driver for superimposing a high frequency current on a direct current to obtain a drive current and supplying the drive current to the laser beam source and driving the laser beam source, and a control unit for adjusting a current value of the direct current and/or the high frequency superimposed current supplied by the laser driver to the laser beam source based on the servo signal or the reproduction signal. The control unit adjusts the current value of the direct current and/or the high frequency superimposed current so that a value representing a waveform fluctuation of the servo signal or the reproduction signal satisfies a specified value of the waveform fluctuation, a value representing a reproduction performance of the reproduction signal satisfies a specified value of the reproduction performance, and a value representing a durability performance of the optical disk in relation to the laser beam satisfies a specified value of the durability performance. | 05-12-2011 |
20110110207 | OPTICAL UNIT, CONTROL METHOD, AND OPTICAL INFORMATION RECORDING/REPRODUCING DEVICE - An optical unit includes an optical system for shining a laser beam on an optical recording medium having a recording layer and a focus control reference surface. The optical system is composed of an objective lens for focusing a recording/reproducing beam emitting from a first light source in the recording layer and focusing a focus control beam emitted from a second light source on the focus control reference surface, a first lens system disposed along an optical path of the recording/reproducing beam and capable of discretely varying a focus position of the recording/reproducing beam in a direction of a thickness of the recording layer, and a second lens system disposed along an optical path common to the recording/reproducing beam and the focus control beam and capable of continuously varying focus positions of the recording/reproducing beam and the focus control beam in a direction of a thickness of the recording layer. | 05-12-2011 |
20110110208 | COMA ABERRATION COMPENSATING DEVICE, COMA ABERRATION COMPENSATING METHOD, AND OPTICAL DISC - A method for compensating the coma aberration in a pickup of a recording and reproducing device that records or reproduces data on or from an optical disc using the pickup is provided. The method includes a first coma aberration compensating step to compensate coma aberration in a body of an optical system including an objective lens for emitting a light beam to an optical disc including a plurality of recording layers and a second coma aberration compensating step to compensate coma aberration caused by relative inclination of the optical system with respect to the optical disc. | 05-12-2011 |
20110122746 | Assembly Method of Optical Pickup and Optical Pickup Apparatus - A method for assembling an optical pickup apparatus for recording/reproducing a high density DVD, DVD and CD including two objective lens and three laser light sources, the objective lenses being provided on the lens holder having an actuator base for supporting the actuator, the method for assembling the optical pickup apparatus comprises the steps of adjusting a first tilt angle of the actuator base so that a coma aberration of a spot formed by the first light beams decreases when the first light beams are converged onto the first recording medium via the first objective lens, and adjusting a second tilt angle formed between the second objective lens and the lens holder so that a coma aberration of a beam spot formed by the second light beams decreases when the second light beams are converged onto the second recording medium via the second objective lens. | 05-26-2011 |
20110134732 | OPTICAL RECORDING MEDIUM, OPTICAL RECORDING MEDIUM DRIVING APPARATUS, AND OPTICAL RECORDING MEDIUM DRIVING METHOD - An optical recording medium driving apparatus includes an optical pickup which irradiates first and second laser lights from one object lens with respect to an optical recording medium having a bulk layer and a tilt detection surface; a focus control portion that performs the focus control relative to each predetermined position of the optical recording medium in regard to each of the first and second laser lights; a tracking control portion that controls the position of the object lens to perform the tracking control of the first and second laser lights relative to the optical recording medium; and a tilt control portion. | 06-09-2011 |
20110182160 | OPTICAL DISC APPARATUS, DRIVING METHOD OF OPTICAL DISC APPARATUS - An optical disc apparatus, for executing recording or reproducing on an optical disc having at least two (2) or more of recording/reproducing layers, comprises an optical pickup, having: a sphere aberration compensating portion, which is configured to set up a compensation volume of the sphere aberration; an objective lens; and a driver portion, which is configured to drive the objective lens, wherein the sphere aberration compensating portion sets up the compensation volume to that corresponding to an intermediate position between a deepest layer and a most front layer from the optical pickup; the driver portion drives the objective lens to come close to the optical disc, when the compensation volume is set to that corresponding to the intermediate position; the sphere aberration compensating portion sets up the compensation volume to that corresponding to the deepest layer, when the objective lens is driven in a direction of coming close to the optical disc; and the driver portion drives the objective lens in a direction of separating from the optical disc, when the compensation volume is set to that corresponding to the deepest layer, and thereby executing an adjustment process at high accuracy within a short time-period. | 07-28-2011 |
20110211430 | Disc discrimination apparatus and method - Detection is made as to at least one of a ratio between a tracking error and a focus error, and a duty cycle of an off-track signal with respect to an optical disc. A decision is made as to whether or not the optical disc is playable on the basis of the detected at least one of the ratio and the duty cycle. The ratio is a ratio of the focus error to the tracking error or a ratio of the tracking error to the focus error. | 09-01-2011 |
20110235482 | OPTICAL INFORMATION PROCESSING METHOD AND OPTICAL INFORMATION PROCESSING APPARATUS - An optical information processing method and apparatus performs a light irradiating and receiving step, a signal processing step, and an adjusting step of a spherical aberration and a focus offset on the basis of shift amount of first and second control devices and a performance evaluation value. The performance evaluation values for first, second, third and fourth points in an x and y coordinate system are detected, in which an x-coordinate is one of the shift amount of the first control device and the shift amount of the second control device and a y-coordinate is the other, the first point, second and third points having the same y-coordinate and different x-coordinates with each other, the fourth point being provided on a first straight line passing through the first point and being different from the first point. | 09-29-2011 |
20110235483 | DISC APPARATUS - A disc apparatus is disclosed that includes a jitter-value detection unit configured to detect a jitter value based on a signal to be read from a medium. A detrack-value setting unit is configured to set a detrack value for focusing an objective lens in the medium based on the jitter value. A detrack-value adjusting unit is configured to detect the jitter value every time the detrack value is changed stepwise within a predetermined range of the detrack value including a reference value of the detrack value, to obtain an optimum detrack value to be set in the detrack-value setting unit, based on a maximum jitter value and a minimum jitter value of the detected jitter values. | 09-29-2011 |
20110255386 | OPTICAL DISC DEVICE - The optical disc device has a circuit which forms a focus error signal for focus servo control based on reflection light from an optical disc exposed to laser light. Also, the device has a data processing unit which can control by feedback a position to which an objective lens is moved by a focusing actuator based on a focus error signal. In label printing, the data processing unit controls, by feedforward, a position to which the objective lens is moved by the focusing actuator based on control data for label printing. The operation resolution of the focusing actuator in feedforward control is made higher than that in feedback control. Thus, an intended position control accuracy is achieved in feedforward control. For instance, in feedforward control, the gain of the driver circuit for the focusing actuator is switched to a smaller one in comparison to that in feedback control. | 10-20-2011 |
20110292778 | OPTICAL PICKUP DEVICE - A tracking signal and a focusing signal are stabilized by eliminating multi-layer crosstalk. The diffraction position, with respect to a semiconductor detector, from a center region of a multi-region diffraction grating disposed along the return path of reflection light from the layer of interest is placed further away from the optical axis than the diffraction position from a peripheral part of the diffraction grating. Stray light from other layers is thus prevented from being incident on a sensing region for a peripheral region of the diffraction grating. Further, the area of the semiconductor detector is reduced by dividing the center region. | 12-01-2011 |
20110305123 | OPTICAL PICKUP CONTROL CIRCUIT AND OPTICAL DISC DRIVE DEVICE - An optical pickup control circuit includes an adding portion that adds a tracking driving signal which is for moving an objective lens, provided to face a discoid optical information recording medium, in a tracking direction of the corresponding optical information recording medium, to a tilt driving signal which is for moving the corresponding objective lens in a tilt direction of the corresponding optical information recording medium, and supplies the signal to a tilt actuator. | 12-15-2011 |
20120002518 | PLAYBACK DEVICE, PLAYBACK METHOD AND PROGRAM - There is provided a playback device including an adjustment portion that, based on a first data recording surface among a plurality of data recording surfaces of an optical recording medium, adjusts tilt with respect to the first data recording surface, an adjustment amount measurement portion that measures a first tilt adjustment amount from a result of the tilt adjustment, an acquisition portion that acquires a coma aberration of the playback device, and a calculation portion that, based on the first tilt adjustment amount and the coma aberration, calculates a second tilt adjustment amount to adjust tilt with respect to a second data recording surface that is different to the first data recording surface. | 01-05-2012 |
20120026849 | OPTICAL DISC DEVICE - An optical disc device includes: a focus error signal generation section configured to generate a focus error signal based on reflected light from an optical disc; and a focus control section configured to generate a drive signal for focus control of an optical pickup from the focus error signal. The focus control section includes a filter adjustment portion configured to activate a filter adjustment signal when the absolute value of the focus error signal is equal to or more than an error threshold, a proportional term computing unit, an integral term computing unit configured to multiply the focus error signal by an integral gain and integrate the multiplied result, a differential term computing unit, and an adder configured to add up results of these computing units to be output as the drive signal. The integral term computing unit decreases the integral gain when the filter adjustment signal is active. | 02-02-2012 |
20120044792 | METHOD AND APPARATUS FOR DETERMINING AN OPTIMAL FOCUS BIAS AND SPHERICAL ABERRATION COMPENSATING VALUE IN AN OPTICAL DISC DRIVE - A method for determining an optimal combination of focus bias and spherical aberration compensating value (SA value) in an optical disc drive is provided. Firstly, a first focus bias is set, the SA values are adjusted and the corresponding tracking error signal values are measured. Second-order-approximation is performed to obtain a first maximum value of tracking error signal. Secondly, a second focus bias is set, the SA values are adjusted and the corresponding tracking error signal values are measured. Second-order-approximation is performed to obtain a second maximum value of tracking error signal. Thirdly, a third focus bias is set, the SA values are adjusted and the corresponding tracking error signal values are measured. Second-order-approximation is performed to obtain a third maximum value of the tracking error signal. The three maximum values are compared to obtain the optimal combination of focus bias and SA compensating value in the optical disc drive. | 02-23-2012 |
20120069723 | OPTICAL RECORDING MEDIUM DRIVE DEVICE AND RECORDING METHOD - An optical recording medium drive device including: a combining prism for combining a recording first laser beam emitted from a first light source with a recording second laser beam emitted from the first light source so as to coaxially guide them; an objective lens for condensing the first and second laser beams from the combining prism toward an optical recording medium; a first photodetecting means for detecting reflected light of the first laser beam from a recording layer; a second photodetecting means for detecting reflected light of the second laser beam from a guide layer; a magnification conversion element disposed on an optical path of the second laser beam between a second light source and the combining prism for diffusing or converging the second laser beam incident upon the objective lens; a first focus error generating means for generating a first focus error signal indicating an error between a condensed spot position of the first laser beam and the recording layer based on an output signal of the first photodetecting means; a second focus error generating means for generating a second focus error signal indicating an error between a condensed spot position of the second laser beam and the guide layer based on an output signal of the second photodetecting means; a first focus control means for controlling the objective lens in an optical axis direction thereof in accordance with the first focus error signal; and a second focus control means for controlling a magnitude of the diffusion or convergence of the second laser beam by the magnification conversion element in accordance with the second focus error signal. | 03-22-2012 |
20120099409 | RECORDING DEVICE AND SPOT POSITION CONTROL METHOD - A recording device including a light irradiating and light receiving unit which, in regard to an optical recording medium, which has a reference surface and a recording layer which is formed at a depth position different from the reference surface, where a pit row where intervals of pit formable positions in one circumference is limited to a first interval is formed in the reference surface, and which has a plurality of pit row phases by intervals of the pit formable positions in a pit row formation direction being set in a position which is each deviated by a predetermined second interval in the pit row which are arranged in the radial direction, irradiates a first light as recording light with regard to the recording layer and a second light for obtaining reflected light from the reference surface and which receives reflected light of the second light from the reference surface. | 04-26-2012 |
20120163142 | Objective Lens Element and Optical Pickup Device Using the Same - An objective lens element which can obtain appropriate spot performance only by simple position adjustment, and an optical pickup device using the objective lens element are provided. In the objective lens element, an amount of a generated third-order astigmatism of a spot which is formed when symmetry axes of optically functional surfaces are located parallel to the normal line of a base plate and an incident light beam incident such that a central light beam thereof is tilted at 0.5 degree with respect to the normal line of the base plate is converged, is reduced to be less than an amount of a generated spherical aberration of a spot which is formed when the symmetry axes of the optically functional surface are located parallel to the normal line of the base plate and an incident light beam incident parallel to the normal line of the base plate is converged. | 06-28-2012 |
20120213046 | OPTICAL PICKUP DEVICE AND OPTICAL DISC APPARATUS - In an optical pickup device for a simple optical system, a light beam emitted from a laser diode is split into first and second light beams by a polarized beam splitter, an optical disc is irradiated with the first light beam to obtain signal light, and the second beam is reflected by a reflection element to obtain reference light. Light beams of the signal light and the reference light are synthesized into one light beam, the synthesized light beam is separated into four light beams by a phase difference forming unit including a grating, a divided wave plate and a polarization grating, and different phase differences are afforded to the signal light and the reference light in each light beam. The four light beams are detected by one detector to generate the reproduction signal. | 08-23-2012 |
20120230171 | OPTICAL DISC DEVICE - The operability of an optical disc device for reading or writing data from/to a disc having a data layer and a servo layer is improved by increasing the resistance to control disturbances. An optical disc device in accordance with the present invention includes an objective lens, a relay lens, a blue-violet laser detector, a red laser detector, an objective lens focus actuator, an objective lens tracking actuator, a relay lens actuator, a pair of focus error signal generating units, a pair of focus control signal generating units, a switching unit for selecting a focus control signal, a pair of tracking error signal generating units, a pair of tracking control signal generating units, a switching unit for selecting a tracking control signal, a focus error conversion unit and a tracking error conversion unit. | 09-13-2012 |
20120294129 | OPTICAL DISC APPARATUS - An FE·FS ratio, which is a ratio of a focus error signal amplitude and a focus sum signal amplitude which are measured by using one kind of light source of at least two kinds of light sources that are compatible with different kinds of optical discs, is calculated; | 11-22-2012 |
20120300603 | OPTICAL DISC APPARATUS AND METHOD OF CONTROLLING THE SAME - An optical disc apparatus includes an optical pickup unit which reads data recorded on an optical disc and converts the data into a radio frequency (RF) signal. A defect detection unit detects a defect on the optical disc using the RF signal output from the optical pickup unit. A servo signal processing unit holds a servo control signal in a corresponding defective section when the defect is detected on the optical disc. A control unit detects the variance of the servo control signal after the defective section, and uses that as feedback so as to control a servo control signal of a subsequent defective section. | 11-29-2012 |
20120300604 | DISK DRIVE - A disk drive determines, from eccentric amounts of individual prescribed rotation phases for one round of an optical disk | 11-29-2012 |
20120307610 | OPTICAL DISC APPARATUS - An optical disc apparatus includes an optical pickup, a signal generation section which generates a total reflection signal and a focus error signal, and a servo control section which controls optical pickup. The optical disc apparatus further includes a main control section which binarizes the track cross signal by using a predetermined threshold value and, by using the binarized track cross signal, checks the tracing state of a track. The main control section controls the servo control section to check, by tracing one turn of the track of an optical disc, whether or not a tracking servo deviation occurs. When a tracking servo deviation occurs during the tracing, the main control section controls the servo control section to make the check once again. When, in the check made once again, a tracking servo deviation is found to occur again, the main control section increases the threshold value used in binarization. | 12-06-2012 |
20120314553 | OPTICAL INFORMATION REPRODUCTION DEVICE, OPTICAL INFORMATION RECORDING DEVICE, OPTICAL INFORMATION REPRODUCTION METHOD, AND OPTICAL INFORMATION RECORDING METHOD - The present invention accurately operates a tilt servo even if a gap servo is operated with a small gap. A condensing unit ( | 12-13-2012 |
20120320721 | OPTICAL RECORDING MEDIUM DRIVING APPARATUS, AND METHOD OF GENERATING TRACKING ERROR SIGNAL - An optical-recording-medium driving apparatus includes: a light irradiating/receiving section configured to irradiate light on a medium so as to form a first side spot, a main spot, and a second side spot, and to receive reflection light from the individual spots; a first delay section configured to delay a light reception signal on the first side spot in accordance with a disposition interval between the first and the second side spots; a second delay section configured to delay a light reception signal on the main spot in accordance with a disposition interval between the main and second side spots; and a tracking-error-signal generation section configured to generate a tracking error signal on the basis of a correlation between delayed light reception signals on the first side spot and the main spot, and a correlation between the light reception signals on the second side spot and the main spot. | 12-20-2012 |
20120320722 | OPTICAL DISC APPARATUS, TILT CORRECTION METHOD, AND PROGRAM - An optical disc apparatus includes: a light irradiation/reception section to irradiate an optical disc recording medium with light via an objective lens and receive return light of the light; a tilt adjustment section to tilt the lens; a focus servo control section to exert focus servo control over the lens; a focus bias application section to apply a focus bias to a focus servo loop; a tracking direction error signal generation section to generate a tracking direction error signal representing an error between light-reception signals; and a control section to perform a tilt adjustment value search process for making a search for a tilt adjustment value with which the tracking direction error signal is maximized, a tilt adjustment value revision process for revising the tilt adjustment value found by the tilt adjustment value search process, and an adjustment control process for causing the tilt adjustment section to perform tilt adjustment. | 12-20-2012 |
20150055443 | OPTICAL DISC DEVICE AND METHOD FOR DRIVING THE SAME - Provided is an optical disc device including: an optical pickup which includes an objective lens and a receiver unit which receives light reflected off an optical disc; a signal processing unit which generates a main push-pull signal and sub push-pull signals from signals from the receiver unit, and obtains a signal obtained by subtracting the main push-pull signal from the sub push-pull signal multiplied K times, to generate a tracking-error signal; and a control unit which performs a midpoint servo process, an offset process of adding an offset value to a lens-error signal indicating displacement of the objective lens, a stabilization awaiting process of waiting for oscillation of the optical disc to stabilize, a measurement process of measuring the tracking-error signal, and a K value adjusting process of adjusting a value of K in response to a result of the measurement process. | 02-26-2015 |
20150318011 | RECORDING/REPRODUCING APPARATUS AND RECORDING MEDIUM - This recording/reproducing apparatus that records or reproduces information by radiating light to a recording medium is provided with: a medium rotating unit that rotates the recording medium; a moving unit having a movable unit that is capable of moving within a predetermined plane; a rotation angle detecting unit that detects a rotating angle of the recording medium using an angle detection mark that is provided on the recording medium; a position detecting unit that detects a position of the recording medium using an eccentricity detection mark that is provided on the recording medium; and a member for fixing the rotation angle detecting unit and the position detecting unit. With respect to the member, the movable unit relatively moves within a plane substantially parallel to the recording surface of the recording medium, and the medium rotating unit is fixed to the movable unit. | 11-05-2015 |
20160027463 | Servo Processor Receiving Photodetector Signals - A digital servo method for an optical disk drive includes receiving low-pass filtered and gain-adjusted versions of photodetector output signals resulting from an illumination of an optical disk. Versions of the photodetector signals are digitized to produce digital signals. A focus control signal is determined through at least one servo algorithm in a digital signal processor based on a focus error determined from the digital signals. Alternatively, a tracking control signal is determined through at least one servo algorithm in the digital signal processor based on a tracking error determined from the digital signals. An optical disk drive includes an analog-to-digital converter configured to convert low-pass filtered and gain-adjusted versions of photodetector output signals into at least one digital signal and the digital signal processor. | 01-28-2016 |
20160140995 | Servo Processor Receiving Photodetector Signals - An optical disk drive and a digital servo method for the optical disk drive includes controlling functions of the optical disk drive with a microprocessor. Low-pass filtered and gain-adjusted versions of photodetector output signals resulting from an illumination of an optical disk are received. Versions of the photodetector signals are digitized to produce digital signals. A focus control signal is determined through at least one servo algorithm executed by a digital signal processor based on a focus error determined from the digital signals. Alternatively, a tracking control signal is determined through at least one servo algorithm executed by the digital signal processor based on a tracking error determined from the digital signals. The digital signal processor has a specialized structure and arrangement for processing digital signals at a higher speed than the microprocessor | 05-19-2016 |
20160155461 | TRACKING CONTROL DEVICE, TRACKING CONTROL METHOD, AND OPTICAL DISC APPARATUS | 06-02-2016 |
20160171997 | RECORDING/REPRODUCING APPARATUS | 06-16-2016 |