Patent application number | Description | Published |
20080205212 | OPTICAL HEAD APPARATUS, INFORMATION RECORDING/REPRODUCING APPARATUS INCLUDING THE OPTICAL HEAD APPARATUS, AND INFORMATION RECORDING/REPRODUCING METHOD - 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. | 08-28-2008 |
20080205216 | INFORMATION RECORDING APPARATUS CAPABLE OF RECORDING INFORMATION IN INFORMATION RECORDING MEDIUM, INFORMATION RECORDING METHOD, AND TARGET VALUE DETERMINING METHOD - According to one embodiment, an apparatus which records a signal in a recording medium in which information is written by using a first laser having a first wavelength and from which information is read by using a second laser having a second wavelength longer than that of the first laser, a signal is recorded in the recording medium by using the first laser, and a control section reproduces the signal recorded with the first laser and measures a first amount that is used to calculate a target value for optimization of recording conditions, reproduces a signal recorded with the second laser and measures a second amount for optimization of a reproduction signal, compares the first amount with the second amount, and determines the first amount under the recording conditions where the second amount becomes optimum as a target value for optimization of the recording conditions. | 08-28-2008 |
20080304401 | INFORMATION RECORDING MEDIUM, INFORMATION RECORDING METHOD, AND INFORMATION REPRODUCING METHOD - According to one embodiment, an optical information recording medium includes pre-grooves with an irregular shape and lands each of which is sandwiched between the pre-grooves adjacent to each other, where the pre-grooves and lands are defined on an interface between a recording layer and a light reflection layer in a recording film, where the recording film includes a light reflectivity that enables reproduction with light of 650±5 nm, the recording layer includes a recording sensitivity with respect to light by a wavelength shorter than 650±5 nm, and a recording mark can be formed on the pre-groove by using light with a wavelength shorter than 650±5 nm. | 12-11-2008 |
20090103422 | OPTICAL RECORDING HEAD DEVICE, OPTICAL RECORDING APPARATUS, AND RECORDING METHOD - According to one embodiment, an optical recording head device includes a light source which outputs such a relaxation oscillation optical pulse that a full width at half maximum of a single pulse is 820 ps or less, a driving unit for driving the light source, an objective lens which converges emission light from the light source on a recording layer of a recording medium, and captures reflective light which is reflected by the recording layer of the recording medium, a distribution unit, placed between the light source and the objective lens, for distributing incident light, and a photodetection unit for receiving via the distribution unit the reflective light which is reflected by the recording layer of the recording medium, wherein a resonator length of the light source is 6560 μm or less. | 04-23-2009 |
20090109808 | OPTICAL HEAD DEVICE AND INFORMATION - According to one embodiment, a laser drive circuit which supplies a drive current to a laser element which outputs light at a predetermined wavelength, and a laser control circuit which supplies a predetermined timing pulse for generation of relaxation oscillation in a laser drive current supplied to the laser drive circuit, the laser control circuit supplying a laser drive current higher than a threshold value which is supplied from the laser drive circuit to the laser element to enable laser light to be output from the laser element, the laser control circuit setting the laser drive current to a level lower than the threshold value on the basis of the timing pulse. | 04-30-2009 |
20090109809 | LASER DRIVE DEVICE AND INFORMATION RECORDING/REPRODUCING APPARATUS USING THE DEVICE - According to one embodiment, a laser drive circuit includes a photodetector which receives part of laser light emitted from a laser element to a recording medium independently of reflection laser light reflected by the recording medium, and outputs an output corresponding to the strength thereof, an integration circuit which integrates the output from the photodetector for a predetermined time, and a setting circuit which sets the intensity of a laser drive current supplied to the laser element on the basis of the output from the integration circuit. | 04-30-2009 |
20090109815 | OPTICAL DISC DEVICE AND OPTICAL DISC PROCESSING METHOD - According to one embodiment, an optical disc device includes a light source portion which applies laser light to an optical disc, a drive portion which supplies a drive current to the light source portion so as to cause the light source portion to apply laser light of light pulses having relaxation oscillation, and a controller which controls the drive portion to supply a drive current so as to cause the light source portion to emit laser light of (n−1)×N (N is an integral number) light pulses having relaxation oscillation with respect to a mark with recording mark length nT (n: integral number, T: channel clock) to be recorded on the optical disc. | 04-30-2009 |
20090141760 | DRIVE CONTROL APPARATUS AND DRIVE CONTROL METHOD OF SEMICONDUCTOR LASER - According to one embodiment, a drive control apparatus of a semiconductor laser includes a driving circuit which drives the semiconductor laser by applying pulses transiting from bias current to peak current to the semiconductor laser as laser driving current that causes relaxation oscillation of emission light intensity of the semiconductor laser, and a control circuit which controls the bias current such that the bias current has a predetermined ratio limiting fluctuation of a leading peak value of the relaxation oscillation occurring for each application of pulses relative to threshold current of the semiconductor laser. The control circuit changes the bias current to maintain the predetermined ratio relative to fluctuation of the threshold current. | 06-04-2009 |
20090196138 | INFORMATION RECORDING APPARATUS AND CONTROL METHOD THEREOF - According to one embodiment, in one embodiment of the invention, a laser drive circuit is provided with a first current source, a second drive current source, and a third current source. The control section selectively obtains a plurality of laser light use mode of controlling the from first to third current sources to use pulse laser light accompanying relaxation oscillation, and a complex laser light use mode of using laser light where laser pulses are combined, whose starting end has an abrupt impulse change portion caused by relaxation oscillation and whose intermediate section is a flat portion with a fixed intensity. | 08-06-2009 |
20090196142 | INFORMATION RECORDING MEDIUM, INFORMATION RECORDING METHOD, AND INFORMATION RECORDING AND REPRODUCING APPARATUS - According to one embodiment, in an information recording medium for which a phase change material is used and in which information is recorded on, reproduced from, and erased from a recording layer by light irradiation, a recrystallization width WR at a periphery of an amorphous recording mark formed on the recording layer by light irradiation, and a recording mark width WA and a track pitch TP satisfy 1.008-06-2009 | |
20090196148 | MASTER RECORDING APPARATUS AND MASTER RECORDING METHOD - According to one embodiment, the invention provides a master recording apparatus and method which can form a pit having a symmetrical pit shape with excellent reproducibility. An embodiment of the invention is a master recording apparatus where a resist film on a master for an optical disk is irradiated with irradiation light from a semiconductor laser to record information on the resist film, where the resist film is formed as an inorganic resist film, and means for outputting the irradiation light from the semiconductor laser as a short pulse laser with a pulse width between 200 ps and 1 ns is provided. | 08-06-2009 |
20100135436 | SIGNAL PROCESSING SYSTEM AND INFORMATION STORAGE MEDIUM - According to one embodiment, a first encoder encodes main information, a second encoder encodes sub-information, a first modulator modulates a carrier based on an output of the first encoder, a duplicating module duplicates an output of the second encoder to generate encoded sub-information units, and a second modulator amplitude-modulates an output of the first modulator based on the encoded sub-information units. The second modulator amplitude-modulates with σ/(μ×(2 | 06-03-2010 |
20110158059 | INFORMATION STORAGE MEDIUM, RECORDING METHOD, AND RECORDING APPARATUS - According to one embodiment, an information storage medium in which layer 0 and layer 1 are arranged from a read surface, a system lead-in area, data lead-in area, data area, and middle area are arranged from an inner circumference of the layer 0, and a system lead-out area, data lead-out area, data area, and middle area are arranged from an inner circumference of the layer 1. A guard track zone is arranged on a side of the data area in the data lead-out area, and a reference code zone, R physical format information zone, recording management zone, and drive test zone are arranged in the data lead-in area of the layer 0 and padding of the guard track zone of the data lead-out area is performed after padding of the drive test zone of data lead-in area and recording of the recording management zone. | 06-30-2011 |
20110158060 | INFORMATION STORAGE MEDIUM, RECORDING METHOD, AND RECORDING APPARATUS - According to one embodiment, an information storage medium in which layer | 06-30-2011 |
20110158061 | INFORMATION STORAGE MEDIUM, RECORDING METHOD, AND RECORDING APPARATUS - According to one embodiment, an information storage medium in which layer | 06-30-2011 |
20110164480 | INFORMATION STORAGE MEDIUM, RECORDING METHOD, AND RECORDING APPARATUS - According to one embodiment, an information storage medium in which layer | 07-07-2011 |
20120224462 | PICKUP HEAD, INFORMATION RECORDING METHOD AND REPRODUCING METHOD - According to one embodiment, a pickup head includes a plurality of light sources, a first objective lens, second objective lens, a driving unit, a first control unit, a second control unit, light receiving units. The first objective lens focuses a first light beam at a first recording layer. The second objective lens focuses a second light beam at a second recording layer. The driving unit moves the first objective lens and the second objective lens in a first direction and a second direction. The first control unit corrects displacement from target track along the first direction. The second control unit controls a moving direction of a position of the second light spot in the second direction. | 09-06-2012 |
20120236696 | FOCUS SERVO CONTROL DEVICE, AND INFORMATION RECORDING/REPRODUCING DEVICE USING THE SAME - A focus servo control device includes a first detector, first controller, second detector, and second controller. The first detector detects a first focus error signal. The first controller controls the objective lens based on the first focus error signal, so that a focal point of the first laser agrees with the guide layer. The second detector detects a second focus error signal. The second controller changes a relative distance between the focal point of the second laser and the focal point of the first laser, so that the focal point of the second laser agrees with a target recording/reproducing layer. | 09-20-2012 |
20120294130 | DATA STORAGE DEVICE - According to one embodiment, a data storage device includes a data recording medium, a light source, and following units. The light application unit splits the laser beam from the light source, and applies the first and second light beams to the data recording medium from different directions. The light detection unit detects reflected light beams from the data recording medium. The light deflection unit deflects the reflected light beams to direct the reflected light beams to the light detection unit. The arithmetic unit calculates positional error information based on the detection signal. The drive unit displaces a position and a posture of the data recording medium based on the positional error information. | 11-22-2012 |
20130021892 | INFORMATION RECORDING AND REPRODUCING APPARATUS - According to one embodiment, an information recording and reproducing apparatus including, a focus control module, an objective lens control module, a calculation module, and a tracking control module. If, detection the recording marks line, to focus a laser light of a second wavelength to the recording layer through an objective lens and to operation a recording layer tracking control using a tracking error signal taken out from a second reflected light and a laser light of a first wavelength to a track groove through the objective lens and to operation a guide layer tracking control to control the objective lens using a tracking error signal taken out from a first reflected light. | 01-24-2013 |
20130077457 | HOLOGRAPHIC RECORDING METHOD, AND RECORDING AND REPRODUCTION APPARATUS - In one embodiment, a method is disclosed for recoding information in form of a hologram. The method can generate a displacement signal by detecting a displacement of a holographic recording medium. The method can perform an exposure control operation that, if the sampling value of the displacement signal falls within an allowable displacement range, records the information item in the holographic recording medium, and if the sampling value of the displacement signal falls outside the allowable displacement range, blocks or reduces at least one of the information light and the reference light to a light intensity with which the information item is not recorded in the holographic recording medium. | 03-28-2013 |
20130094341 | OPTICAL PICKUP AND OPTICAL DISK APPARATUS - According to one embodiment, an optical pickup configured to record and to reproduce on a layer of a disk, including, a light source configured to emit a laser beam, an objective lens including a variable use magnification and configured to focus the laser beam on the layer, a collimator lens configured to change the magnification of the objective lens by moving along an optical axis direction, and a liquid crystal module configured to generate spherical aberration to cancel a coma aberration which may occur because an object point and an image point of the objective lens at the use magnification do not exist on an optical axis of the objective lens. | 04-18-2013 |
20130176576 | DISPLACEMENT DETECTION DEVICE AND METHOD - According to one embodiment, a displacement detection device includes a light source, objective lens, beam splitter, aperture limiting element, and detection device. The beam splitter may separate reflected light into portions. The reflected light may be reflected by the medium and then transmitted through the objective lens. The aperture limiting element may include an aperture limited so as to block a portion of the reflected light. The detection device may detect displacement of the medium in a direction of the optical axis based on the reflected light having passed through the aperture limiting element. | 07-11-2013 |
20130194903 | ELECTRONIC DEVICE AND AUDIO OUTPUT METHOD - According to one embodiment, electronic device including, turntable configured to rotate recording medium including recording layer along plane on which surface of recording layer extends, servo data providing mechanism configured to provide on surface of turntable facing recording layer of recording medium and provides servo data used for recording of data on recoding medium or reproduction of data from recording medium, and recording and reproduction module configured to irradiate recording layer of recording medium with light having first wavelength and light having second wavelength different from light having first wavelength from opposite side of recording medium with respect to turntable. | 08-01-2013 |
20130229900 | INFORMATION STORAGE MEDIUM, RECORDING METHOD, AND RECORDING APPARATUS - According to one embodiment, an information storage medium in which layer 0 and layer 1 are arranged from a read surface, a system lead-in area, data lead-in area, data area, and middle area are arranged from an inner circumference of the layer 0, and a system lead-out area, data lead-out area, data area, and middle area are arranged from an inner circumference of the layer 1. A guard track zone is arranged on a side of the data area in the data lead-out area, and a reference code zone, R physical format information zone, recording management zone, and drive test zone are arranged in the data lead-in area of the layer 0 and padding of the guard track zone of the data lead-out area is performed after padding of the drive test zone of data lead-in area and recording of the recording management zone. | 09-05-2013 |
20140064052 | OPTICAL STORAGE MEDIUM, INFORMATION RECORDING APPARATUS, AND INFORMATION RECORDING METHOD - According to one embodiment, an optical storage medium includes a guide layer, a recording layer group, and a guide layer-side intermediate layer. The recording layer group comprises a plurality of recording layers and a plurality of intermediate layers arranged between the plurality of recording layers. The guide layer-side intermediate layer is arranged between the guide layer and a first recording layer closest to the guide layer out of the plurality of recording layers. A thickness T1 of the guide layer-side intermediate layer does not match a sum S1 of thicknesses of arbitrary continuous intermediate layers comprised in the recording layer group. | 03-06-2014 |
20140086030 | LENS DRIVING DEVICE, INFORMATION RECORDING AND PLAYBACK APPARATUS, AND ELECTRONIC INSTRUMENT - According to one embodiment, a lens driving device includes a movable member, a fixed member, and a magnet. The movable member is configured to retain a lens and a coil. The fixed member is configured to support the movable member such that the movable member is movable in an optical axis direction of the lens using an elastic member. The magnet is configured to generate a driving force for the movable member by interaction with the coil provided in the fixed member. At least one of the coil and the magnet is provided so as to be projected from the fixed member in a direction orthogonal to the optical axis of the lens. | 03-27-2014 |
20140086035 | LENS DRIVING DEVICE, INFORMATION RECORDING AND PLAYBACK APPARATUS, AND ELECTRONIC INSTRUMENT - According to one embodiment, a lens driving device includes a fixed member, a movable member, a support part, and a coil. The movable member is configured to retain a lens and a magnet. The supporting part is configured such that a guide member placed substantially in parallel with a lens optical axis supports the movable member at plural positions symmetric with respect to the lens optical axis while the movable member is movable in a direction of the lens optical axis with respect to the fixed member. The coil is configured such that a driving force is generated for the movable member by interaction with the magnet provided in the fixed member. | 03-27-2014 |
20140185420 | INFORMATION RECORDING MEDIUM, INFORMATION REPRODUCING APPARATUS, MANAGEMENT INFORMATION REPRODUCING METHOD, INFORMATION RECORDING/REPRODUCING APPARATUS AND IDENTIFICATION INFORMATION REPRODUCING/RECORDING METHOD - According to one embodiment, in an information recording medium including a plurality of data layers, at least one pre-format area is provided on each of the data layers and is circumferentially divided into a plurality of segments. Management information including data layer identification information for identifying the data layers is recorded in at least one of the segments in each of the data layers, using the marks include BCA marks extending radially uniformly. On adjacent ones of the data layers, the BCA marks associated with the management information are recorded in differently positioned segments which are not opposed to each other. | 07-03-2014 |