Patent application number | Description | Published |
20080199602 | Method for manufacturing magneto-optical recording medium - A method for manufacturing a magneto-optical recording medium in which reading of recorded information is performed through domain wall displacement in a reproduction layer is provided, in which magnetic separation of groove side-wall portions is performed more reliably; as a result a magneto-optical recording medium with satisfactory recording and reproduction characteristics can be provided. The method is to manufacture a magneto-optical recording medium in which on a substrate | 08-21-2008 |
20080239922 | OPTICAL DISC APPARATUS, INFORMATION RECORDING METHOD, AND INFORMATION REPRODUCTION METHOD - An optical disc apparatus that records recording marks in a plurality of mark layers by irradiating predetermined light onto a disc-like volume type recording medium on the basis of information to be recorded is disclosed. The apparatus includes: a first focus position adjusting means for adjusting the position of a focus on which a first light beam focuses within the volume type recording medium, in the direction of an optical axis of the first light beam; a second focus position adjusting means for adjusting the position of a focus on which a second light beam focuses within the volume type recording medium, in the direction of an optical axis of the second light beam; a focus control means for controlling the first focus position adjusting means and the second focus position adjusting means; and a recording control means for forming the recording marks at the positions of respective focuses. | 10-02-2008 |
20080239924 | OPTICAL DISC APPARATUS AND METHOD FOR REPRODUCING INFORMATION - An optical disc apparatus reproducing information on the basis of a standing wave recorded on a disc-like volume type recording medium is disclosed. The apparatus includes: first focus position adjusting means for adjusting the position of a focus on which a first light beam focuses inside a recording layer inside the volume type recording medium in the optical axis direction of the first light beam; second focus position adjusting means for adjusting the position of a focus on which a second light beam focuses inside the recording layer in the optical axis direction of the second light beam; controlling means for controlling the first focus position adjusting means and the second focus position adjusting means; and first and second detecting means for detecting the first and second reproduction light beams. | 10-02-2008 |
20080253271 | OPTICAL DISK AND METHOD OR PRODUCING OPTICAL DISK - An optical disk is disclosed. The optical disk includes a substrate having lands and pits arranged and formed along a recording track so that data are recorded; a reflective film deposited on the substrate; and a protective layer formed on the reflective film, where an edge of the pits in the array direction is irradiated with light from a side of the protective layer to deform the pits, so that pit data are rewritten and recorded, and the reflective film includes an alloy formed of AlFeX having Al as a main component, where X contains any one or more of Ti, Cu, Au, Pt, and Si. | 10-16-2008 |
20080304399 | RECORDING MEDIUM, REPRODUCING APPARATUS, AND METHOD OF MANUFACTURING RECORDING MEDIUM - A recording medium is disclosed. The recoding medium includes a recording layer on which binary data is recorded, and a reflecting layer. The recording layer includes a recording portion having a flat portion and a concave portion. The flat portion and the concave portion are formed on the surface of the recording portion. The flat portion is configured to represent first data of the binary data, and the concave portion is configured to represent second data of the binary data. The reflecting layer is formed on one side of the recording layer. | 12-11-2008 |
20090010115 | OPTICAL-DISK RECORDING MEDIUM, PLAYING APPARATUS AND METHOD FOR SAME, AND RECORDING APPARATUS AND METHOD FOR SAME - In an optical disk, a substrate has main data recorded in the form of a combination of pits and lands on one side thereof, and at least a reflective layer and cover layer are stacked on the substrate to cover the pits and lands on the substrate. To the optical disk, sub data is recorded in the form of marks formed by irradiating writing-power laser light to the reflective layer. The marks are formed so that reading signal level will be raised where the marks are formed while it will be lowered where the marks are formed in a counterfeit disk produced based on an authenticated disk, namely, the reading signal level where the marks are formed is different in polarity between in the authenticated and counterfeit disks. Further, in a player for the optical disk, discrimination is made between the authenticated and counterfeit disks by detecting the sub data recorded in the optical disk and judging whether the value of the detected sub data has been read at a correct polarity. | 01-08-2009 |
20090028014 | RECORDING DEVICE, RECORDING METHOD, DISC MANUFACTURING METHOD AND OPTICAL DISC RECORDING MEDIUM - An optical disc recording medium is irradiated with laser light having a predetermined laser power to deform an irradiated portion of a substrate into a protruding portion. Since the substrate is deformed so as to have protruding portions, a reflecting layer arranged on the substrate is also deformed so as to have protruding portions. For a pit, the deformed state of a protruding portion allows to obtain a reproduced signal level equivalent to that in each land. For a land, the deformed state of a protruding portion allows to obtain a reproduced signal level equivalent to that in each pit. Since the deformed state of each protruding portion can be controlled on the basis of the power of the laser light for irradiation, pit-to-land deformation and land-to-pit deformation can be performed by setting the laser power. Thus, recorded data can be rewritten on the optical disc recording medium recorded with the data using a combination of pits and lands formed in the substrate. | 01-29-2009 |
20090052310 | OPTICAL DISC REPRODUCTION METHOD AND DEVICE, AND OPTICAL DISC MANUFACTURING METHOD - According to the present invention, there is provided an optical disc player adapted to record a unique ID on a read-only optical disc and positively read the unique ID from the optical disc. The optical disc ( | 02-26-2009 |
20090052312 | RECORDING APPARATUS, REPRODUCING APPARATUS, RECORDING METHOD, REPRODUCING METHOD, AND RECORDING MEDIUM - A recording apparatus for recording data on a recording medium having at least one recording layer, includes a loading unit and a recorder unit. On the loading unit, the recording medium is capable of being loaded. The recorder unit is configured to cause the at least one recording layer a physical change to collectively record a plurality of pieces of data on the at least one recording layer of the recording medium loaded on the loading unit, in a thickness direction of the at least one recording layer, such that the physical change of the at least one recording layer is capable of being detected at one time when the recording medium is reproduced. | 02-26-2009 |
20090067309 | OPTICAL DISC MANUFACTURING METHOD AND DEVICE, OPTICAL DISC, AND OPTICAL DISC REPRODUCTION METHOD - According to the present invention, there is provided a method of recording a unique ID to a read-only optical disc based on the 17PP modulation. The read-only optical disc ( | 03-12-2009 |
20090147652 | OPTICAL DISC DEVICE AND OPTICAL INFORMATION RECORDING METHOD - An optical disc device that irradiates a light beam on an optical disc having a recording layer in which information is recorded and a positioning layer in which tracks for specifying a recording position of the information in the recording layer are provided includes an information recording unit that irradiates a light beam for information on a target position in the recording layer to record the information by shifting a position in an optical axis direction of the light beam for information, a terminal-end recognizing unit that recognizes, when new information is recorded in a recording layer having a recorded area in which information is already recorded, a terminal end of the recorded area, and a target-position setting unit that sets the target position to separate the terminal end of the recorded area and a start end of a recording planned area in which information is recorded anew. | 06-11-2009 |
20090168632 | OPTICAL DISK APPARATUS, POSITION CONTROL METHOD, AND OPTICAL PICKUP - An optical disk apparatus appropriately adjusts the optical paths of a reference light beam and information light beam in an optical path forming section of an optical pickup, condenses the reference light beam and information light beam using an objective lens, and performs position control of the objective lens in the focusing and tracking directions so as to focus the reference light beam onto a reference track in a target mark layer, thereby focusing the focal point of the information light beam condensed by the objective lens onto a target track TG in the target mark layer. | 07-02-2009 |
20090189302 | METHOD FOR MANUFACTURING MICROLENS AND METHOD FOR MANUFACTURING SOLID-STATE IMAGE SENSOR - A method for manufacturing a microlens includes forming a microlens by pressing a microlens mold having a reverse shape of a microlens formed therein on a microlens-forming film formed on a substrate to transfer the reverse shape of the microlens to the microlens-forming film. The microlens mold is formed by irradiating an inorganic resist film which is formed on a mold substrate with exposure light by relative two-dimensional scanning, and etching an exposed region of the inorganic resist film to form the reverse shape of the microlens. The irradiation intensity of the exposure light is adjusted to correspond to the depth of the reverse shape of the microlens from the surface of the inorganic resist film on the basis of profile data of the reverse shape of the microlens. | 07-30-2009 |
20090285059 | APPARATUS FOR INITIALIZING AND METHOD OF MANUFACTURING OPTICAL DISC, AND INITIALIZATION REFERENCE PLATE - An embodiment of the present invention includes rotating an integrated disc formed by temporarily fixing an initialization reference plate to an uninitialized optical disc that is an optical disc to be irradiated with a light beam of light having a predetermined or higher intensity to record information as a recording mark. The initialization reference plate has a reference part that reflects at least a part of a servo light beam of servo light intended for servo control. The reference part contains information that indicates the position of a track of the optical disc for the recording mark to be formed on, in the form of a track of pit-and-projection pattern. | 11-19-2009 |
20090285085 | OPTICAL DISC RECORDING DEVICE, DATA RECORDING METHOD, AND DATA RECORDING PROGRAM - An optical disc recording device includes: an optical disc device to record optical recording data onto an optical disc; a recording data assigning unit to divide a recording region on the optical disc into multiple divisions, part as a data region, assign optical recording data thereto; a redundancy data calculating unit to calculate redundancy data for restoring recorded data; a redundancy data assigning unit to take divided regions other than the data region as a redundancy region, and assign the corresponding redundancy data thereto; a recording/playing device having a recording capacity greater than the data region; and a recording control unit configured to record optical recording data in the data region and also at least a part thereof in the recording/playing device, cause the recording/playing device to play the optical recording data recorded therein at the time of calculating redundancy data, and record calculated redundancy data in the redundancy region. | 11-19-2009 |
20100027403 | OPTICAL DISC APPARATUS AND SIGNAL GENERATION METHOD - An optical disc apparatus includes a light separator configured to separate a light beam emitted from a light source into a main beam and a sub-beam, an objective lens configured to, when the light beam is condensed and irradiated to an optical disc having a uniform recording layer in which a track is formed by record marks, irradiate at least part of the sub-beam to an area where the main beam is not irradiated in a radial direction which is defined as a direction of radius of the optical disc, and a signal generating unit configured to generate a mark layer distance signal, representing a distance between a focus of the light beam and a mark layer to which the track belongs, based on a return light beam resulting from at least one of the main beam and the sub-beam, which has been irradiated to the track. | 02-04-2010 |
20100027574 | OPTICAL INFORMATION RECORDING DEVICE, OPTICAL PICKUP, AND METHOD FOR EMITTING LASER LIGHT - An optical information recording device includes a semiconductor laser for emitting laser light, a light irradiation section for collecting the laser light and irradiating an optical information recording medium with the laser light, and a laser controller for supplying the semiconductor laser with a laser drive current wave in pulse form. The laser drive current wave has an oscillation current value that causes a relaxation oscillation of the semiconductor laser. | 02-04-2010 |
20100046345 | OPTICAL INFORMATION RECORDING MEDIUM, OPTICAL INFORMATION RECORDNG APPARATUS, AND OPTICAL INFORMATION RECORDING METHOD - An optical information recording medium includes a recording layer in which a track is formed, the track having recording marks linearly arranged thereon. Each recording mark has a dimension corresponding to a reference mark length, which serves as a reference, in a track direction along which the track extends, the dimension being smaller than dimensions of the recording mark in two directions perpendicular to the track direction. | 02-25-2010 |
20100238782 | OPTICAL PICKUP, OPTICAL INFORMATION RECORDING METHOD, AND OPTICAL DISK APPARATUS - The recording accuracy of information on an optical disc is increased. | 09-23-2010 |
20100254237 | SHORT-PULSE LIGHT SOURCE, LASER LIGHT EMITTING METHOD, OPTICAL DEVICE, OPTICAL DISK DEVICE, AND LIGHT PICKUP - The present invention can control output of pulses from a semiconductor laser. | 10-07-2010 |
20100309938 | LASER DRIVING DEVICE AND LASER DRIVING METHOD - A laser driving device includes: a pulse signal generating unit that, after a voltage has risen from a predetermined reference voltage to a predetermined output voltage and a time of a sum of an oscillation period of relaxation oscillation and a light emission start time in a predetermined laser diode has nearly elapsed, generates a pulse signal having a waveform that falls divisionally in two or more stages from the output voltage to the reference voltage; and an output unit that generates a laser drive signal by performing signal processing on the pulse signal and outputs the signal to the laser diode. | 12-09-2010 |
20100322063 | OPTICAL INFORMATION REPRODUCING APPARATUS AND OPTICAL INFORMATION REPRODUCING METHOD - An optical information reproducing apparatus includes: an irradiation section irradiating a light beam onto an optical information recording medium, in which holes are formed along a virtual track on a recording medium, along the virtual track; a light receiving section receiving a reflected light beam when the light beam is reflected by the optical information recording medium and sequentially generating a light receiving signal corresponding to the light intensity; a detection section detecting a variation pattern appearing when a signal level of the light receiving signal changes according to the hole; and a code string generating section, when generating a code string corresponding to the signal level, generating a code corresponding to the one hole from the variation pattern if the variation pattern falls within a range and generating a code string, which includes a plurality of codes, from the variation pattern if the variation pattern exceeds the range. | 12-23-2010 |
20110051250 | OPTICAL ELEMENT, AND PROCESSING APPARATUS AND METHOD FOR REDUCING REFLECTION - An optical element includes: a pit forming portion of a material that forms a pit in the vicinity of each focal point of a predetermined light beam upon condensation, wherein the pits are formed in such a manner that the volume percentage of the pits with respect to the material at distances from a light incident face becomes smaller away from the incident face. | 03-03-2011 |
20110103211 | OPTICAL RECORDING MEDIUM, METHOD OF MANUFACTURING OPTICAL RECORDING MEDIUM, RECORDING METHOD AND REPRODUCING METHOD - An optical recording medium includes recording layers and intermediate layers. The recording layers include a diffraction grating that has a predetermined grating pitch and is obtained by alternately laminating first layers and second layers being transparent and having slightly different refractive indexes. The intermediate layers are transparent and have a larger thickness than that of the recording layers. In the optical recording medium, the recording layers and the intermediate layers are alternately laminated. | 05-05-2011 |
20110194391 | LASER DEVICE, OPTICAL PICKUP, AND OPTICAL DISK DEVICE - A laser device includes a semiconductor laser, a signal generating circuit generating a pulse signal for driving the semiconductor laser, an amplifying circuit amplifying the pulse signal, and a control circuit unit provided between the amplifying circuit and the semiconductor laser and controlling the pulse signal by letting alternating-current components of the pulse signal pass through and removing at least part of direct-current components of the pulse signal. | 08-11-2011 |
20110234744 | LIGHT OSCILLATION DEVICE AND RECORDING DEVICE - A light oscillation device has a self oscillation semiconductor laser that has a double quantum well separated confinement heterostructure made of GaInN/GaN/AlGaN materials and that includes a saturable absorber section which is applied with a negative bias voltage and a gain section into which a gain current is injected, a light separation unit that separates a portion of laser light beams from the self oscillation semiconductor laser, a light sensing element that senses the laser light beams separated by the light separation unit, and a current control circuit which controls a current injected into the gain section of the self oscillation semiconductor laser based on an amount of the laser light beams which are sensed by the light sensing element. | 09-29-2011 |
20120044791 | RECORDING APPARATUS - A recording apparatus, which records information in an optical recording medium, includes: a mode-lock laser unit including a saturable absorber section that applies a bias voltage, a gain section that feeds a gain current, a semiconductor laser that emits laser light used to record the information on the optical recording medium, and an external resonator; an optical modulation unit performing amplification modulation on the laser light emitted from the mode-lock laser unit; a reference signal generation unit generating a master clock signal and supplying a signal synchronized with the master clock signal to the gain section of the semiconductor laser; a recording signal generation unit generating a recoding signal based on the master clock signal; and a driving circuit generating a driving pulse used to drive the optical modulation unit based on the recording signal. | 02-23-2012 |
20120044793 | RECORDING DEVICE AND OPTICAL OSCILLATOR DEVICE - A recording device that records information in an optical recording medium includes: a self excited oscillation semiconductor laser including a saturable absorber section to apply a bias voltage and a gain section to inject a gain current, and also emitting a laser light to record the information in the optical recording medium; a reference signal generation unit generating a master clock signal and also supplying an injection signal synchronized with the master clock signal to the gain section of the self excited oscillation semiconductor laser; and a recording signal generation unit generating a recording signal based upon the master clock signal and also applying the recording signal to the saturable absorber section of the self excited oscillation semiconductor laser as the bias voltage. | 02-23-2012 |
20120063288 | RECORDING APPARATUS - A recording apparatus for recording information on an optical recording medium includes a mode-locked laser unit that includes a semiconductor laser emitting a laser beam for recording the information on the optical recording medium, and an external resonator, an optical modulation unit that amplifies and modulates the laser beam emitted from the mode-locked laser unit, a recording signal generation unit that generates a recording signal based on a reference signal from a drive of the optical recording medium, and a modulation unit that generates a modulation signal for driving the optical modulation unit by latching the recording signal using a laser clock generated by an oscillation pulse of the laser beam emitted from the mode-locked laser unit. | 03-15-2012 |
20120099411 | OPTICAL INFORMATION RECORDING MEDIUM, OPTICAL INFORMATION RECORDING APPARATUS, AND OPTICAL INFORMATION RECORDING METHOD - An optical information recording medium includes a recording layer in which a track is formed, the track having recording marks linearly arranged thereon. Each recording mark has a dimension corresponding to a reference mark length, which serves as a reference, in a track direction along which the track extends, the dimension being smaller than dimensions of the recording mark in two directions perpendicular to the track direction. | 04-26-2012 |
20130021425 | OPTICAL OSCILLATION DEVICE AND RECORDING APPARATUS - Provided is a recording apparatus including a self-excited oscillation semiconductor laser that has a double quantum well separate confinement heterostructure and includes a saturable absorber section to which a negative bias voltage is applied and a gain section into which a gain current is injected, an optical separation unit, an objective lens, a light reception element, a pulse detection unit, a reference signal generation unit, a phase comparison unit, a recording signal generation unit, and a control unit. | 01-24-2013 |
20130021887 | OPTICAL OSCILLATION DEVICE AND RECORDING APPARATUS - Provided is a recording apparatus including a self-excited oscillation semiconductor laser that has a double quantum well separate confinement heterostructure and includes a saturable absorber section to which a negative bias voltage is applied and a gain section into which a gain current is injected, an optical separation unit, an objective lens, a light reception element, a pulse detection unit, a reference signal generation unit, a phase comparison unit, a recording signal generation unit, and a control unit. | 01-24-2013 |
20130021891 | OPTICAL OSCILLATION DEVICE AND RECORDING APPARATUS - Provided is a recording apparatus including a self-excited oscillation semiconductor laser that has a double quantum well separate confinement heterostructure and includes a saturable absorber section to which a negative bias voltage is applied and a gain section into which a gain current is injected, an optical separation unit, an objective lens, a light reception element, a pulse detection unit, a reference signal generation unit, a phase comparison unit, a recording signal generation unit, and a control unit. | 01-24-2013 |
20130100789 | RECORDING DEVICE AND OPTICAL OSCILLATOR DEVICE - A recording device that records information in an optical recording medium includes: a self excited oscillation semiconductor laser including a saturable absorber section to apply a bias voltage and a gain section to inject a gain current, and also emitting a laser light to record the information in the optical recording medium; a reference signal generation unit generating a master clock signal and also supplying an injection signal synchronized with the master clock signal to the gain section of the self excited oscillation semiconductor laser; and a recording signal generation unit generating a recording signal based upon the master clock signal and also applying the recording signal to the saturable absorber section of the self excited oscillation semiconductor laser as the bias voltage. | 04-25-2013 |
20130235710 | LIGHT SOURCE AND RECORDING APPARATUS - There is provided a light source including a mode-lock laser unit that includes a semiconductor laser and an external resonator unit and emits a laser beam having a predetermined frequency, the semiconductor laser including a saturable absorber unit that applies a reverse bias voltage and a gain unit that applies a gain current, a semiconductor optical amplifier that performs amplification modulation on the laser beam emitted from the mode-lock laser unit, a laser clock generating unit that generates a laser clock synchronized with the laser beam based on a signal detected from the saturable absorber unit when the laser beam oscillates in the mode-lock laser unit, and a modulating unit that generates a driving current synchronized with the laser clock and applies the driving current to the semiconductor optical amplifier. | 09-12-2013 |
20140353521 | LASER SCANNING MICROSCOPE SYSTEM - There is provided a laser scanning microscope system including a mode-locked laser unit configured to radiate a laser beam with a predetermined frequency, an intermittent light-emitting unit configured to intermittently emit the laser beam radiated from the mode-locked laser unit in a predetermined intermittent light-emission period, a detector configured to convert a fluorescent substance into an electric signal, the fluorescent substance receiving the intermittently emitted laser beam and then being excited from an object, and an A/D conversion unit configured to sample the electric signal in a sampling period synchronized with the intermittent light-emission period. | 12-04-2014 |