Patent application number | Description | Published |
20080277562 | Information Processing Device - Light emitted from alight source ( | 11-13-2008 |
20090009886 | OPTICAL PICKUP AND OPTICAL DISK DEVICE HAVING THIS PICKUP - An optical pickup according to the present invention includes a plurality of light sources for emitting a plurality of light beams including first and second light beams of respectively different wavelengths, an objective lens for converging the plurality of light beams, and a grating structure shaped axisymmetrically with respect to the optical axis of the objective lens. P | 01-08-2009 |
20090010119 | Optical Disk Apparatus - An optical disk apparatus according to the present invention includes: a rotation driving section on which an optical disk is to be mounted and which drives the optical disk so as to be rotated; a light source; an objective lens for converging light from the light source onto an optical disk mounted on the rotation driving section; a photodetector having at least two detection sections for detecting reflected light, from the optical disk, of the light; and an error signal generation section for deriving a difference signal and a sum signal of respective outputs from the two detection sections of the photodetector, adjusting an offset in at least the sum signal among the difference signal and the sum signal, and thereafter dividing the difference signal by the sum signal whose offset has been adjusted to generate a position error signal of the objective lens. | 01-08-2009 |
20090028036 | OPTICAL DISC DEVICE - The invention permits stable tracking with few control errors, uninfluenced by stray light reflected by signal surfaces other than the signal surface being used for focusing during recording and playback of a multilayer disc. To this end, the optical splitter element of the optical disc device according to the present invention has first areas ( | 01-29-2009 |
20090154323 | OPTICAL PICKUP DEVICE AND OPTICAL DISC DEVICE - When recording on and/or reproducing from an information recording medium having a plurality of recording layers is performed, there has been a problem in appropriately detecting a control signal at the time of the recording and/or reproducing, since reflected light from a recording layer, which does not undergo the recording and/or reproducing, enters a photodetector concurrently with reflected light from a recording layer which undergoes the recording and/or reproducing. In the present invention, a polarization hologram is used to diffract light outputted from a light source and to generate a main beam, which is a zeroth-order light beam, and a pair of sub beams, which is a positive first-order light beam and a negative first-order light beam each having a polarization direction perpendicular to a polarization direction of the main beam. Accordingly, it is possible to prevent the reflected sub beams from a recording layer, which is a target undergoing recording and/or reproducing, from interfering with the reflected main beam from a recording layer, which is a non-target not undergoing the recording and/or reproducing. Therefore, it is possible to obtain an accurate control signal based on the sub beams, and also possible to realize an optical pickup device having a preferable recording performance. | 06-18-2009 |
20090238051 | OPTICAL DISC DRIVE - A tracking error signal is generated with stability without being easily affected by a distribution fluctuation of light reflected from an optical disc or by a lens shift. | 09-24-2009 |
20090245068 | OPTICAL PICKUP DEVICE AND OPTICAL DISC DRIVE - An optical pickup device according to the present invention includes: first and second light sources that are driven selectively and that emit blue and red light beams, respectively; an optical element for splitting the blue and red light beams emitted into main and sub-blue beams and main and sub-red beams, respectively; first and second photodetectors that receive the main and sub-blue beams reflected from the optical disc, thereby outputting electrical signals; and third and fourth photodetectors that receive the main and sub-red beams reflected from the optical disc, thereby outputting electrical signals. A dead zone that outputs no electrical signal representing the intensity of the light received is provided for respective parts of the second and fourth photodetectors. | 10-01-2009 |
20090268583 | INFORMATION RECORDING DEVICE AND INFORMATION REPRODUCING DEVICE - An information recording/reproducing device includes a radiation light source | 10-29-2009 |
20090279403 | OPTICAL DISC DEVICE - Light emitted from a radiation light source | 11-12-2009 |
20100039686 | HOLOGRAM PATTERN GENERATION METHOD AND MULTIPLE LIGHT POINTS GENERATION APPARATUS - In order to change the number of light points and light intensities and to move positions of the light points in a real-time manner, an extremely large capacity of a memory is required. In a method according to the present invention, a memory ( | 02-18-2010 |
20100135144 | OPTICAL PICKUP DEVICE AND LENS FOR OPTICAL PICKUP - An optical pickup device according to the present invention comprises: a first mirror for reflecting a first light beam outputted from a first light source and letting a second light beam outputted from a second light source pass therethrough; a first object lens for converging the first light beam reflected by the first mirror on an information recording surface of a recording medium; a second mirror for reflecting the second light beam passing through the first mirror; a second object lens for converging the second light beam reflected by the second mirror on the information recording surface of the recording medium; and an achromatic lens for correcting an axial chromatic aberration of the second object lens generated by wavelength variation of the second light beam, wherein the achromatic lens is provided in an optical path between the first mirror and the second mirror. | 06-03-2010 |
20100135146 | OPTICAL PICKUP DEVICE AND OPTICAL DISC DEVICE - When first-order diffracted beams leak into a region, which is for receiving only a zeroth-order diffracted beam from an optical disc, due to positional displacement between an objective lens and a hologram element, an offset compensation signal includes an AC component, the offset compensation signal preferably including a DC component only. Accordingly, there may be caused deterioration in a modulation degree of the tracking error (TE) signal. A partial light shielding element | 06-03-2010 |
20100232272 | WAVE PLATE, OPTICAL PICKUP AND OPTICAL DISC APPARATUS - An optical pickup includes a wave plate on an optical path to be followed by every light beam emitted from three light sources (with wavelengths λ | 09-16-2010 |
20110002117 | OPTICAL DISC DRIVE - An optical disc drive includes: at least one light source; an objective lens configured to focus the light that has been emitted from the at least one light source; a chromatic aberration compensation element, which is arranged on an optical path between the at least one light source and the objective lens in order to compensate for chromatic aberration that has been produced by the objective lens; and an actuator configured to change a position of the objective lens. The actuator changes the position of the objective lens in a tracking direction by a magnitude of an offset, which is determined by a variation in wavelength of the light to be produced when the power of the light emitted from the at least one light source changes. | 01-06-2011 |
20110002216 | OPTICAL PICKUP DEVICE AND OPTICAL DISC DEVICE - Regarding optical pickup devices usable for performing recording on and reproduction from a plurality of types of optical discs, there is a problem that because of the structure of locating many optical elements in a height direction of an optical system, the height of the optical system is increased and so it is difficult to realize a thin and compact optical pickup device. According to the present invention, a first wave plate is located between a first light source and a first mirror, a second wave plate is located between a second light source and a second mirror, and the first wave plate and the second wave plate cause a desirable phase shift to light beams of the first through third wavelengths. Owing to this, the number of optical elements located in the height direction of the optical system can be decreased, and so the height of the optical system can be reduced. | 01-06-2011 |
20110170384 | OPTICAL DISC DRIVE - An optical disc drive according to the present invention writes information on an optical disc, which includes a substrate on which a number of pre-pits have been formed on its tracks and a recording film that is supported on the substrate. The optical disc drive includes a writing control section for instructing an optical pickup to record marks on the tracks by irradiating the recording film with a writing light beam. In accordance with information that defines, on the tracks, recordable areas Aa | 07-14-2011 |
20110170385 | OPTICAL DISC DRIVE - An optical disc drive according to the present invention can write information on an optical disc, which includes a substrate on which a number of pre-pits | 07-14-2011 |
20110170386 | OPTICAL DISC DRIVE - An optical disc drive according to the present invention includes an optical pickup and a writing control section for instructing the optical pickup to record a mark, representing the information to be written, on the optical disc. In recording the mark on the optical disc, the writing control section instructs the optical pickup to irradiate the same area on the optical disc with a light beam a plurality of times so that the mark is recorded in that repeatedly irradiated area. | 07-14-2011 |
20110261670 | OPTICAL PICKUP DEVICE AND OPTICAL DISC DEVICE - When recording/reproducing an information recording medium having a plurality of information recording layers, a photodetector receives reflected light from a recording layer which is being recorded/reproduced, as well as reflected light from another recording layer which is not being recorded/reproduced, making it difficult to appropriately detect control signals during a recording/reproducing operation. The present invention employs a polarization hologram element so that the polarization direction of 0 | 10-27-2011 |
20110276989 | OPTICAL PICKUP DEVICE AND OPTICAL DISC DRIVE - Has an object of providing an optical pickup capable of realizing tracking control or focus control at a higher level of precision even when relative positions of a light source and a light detector are shifted due to a change in the environmental temperature, long-term deterioration or the like. The optical pickup includes a base member; a light source, fixed to the base member, for emitting a laser beam; an objective lens for collecting the laser beam onto an optical disc; a light detector, fixed to the base member, for detecting the laser beam reflected by the optical disc; fixing means for fixing the light source and/or the light detector to the base member; and a light blocking section for blocking a central portion of the laser beam in a circular shape on an optical path between the collimator lens and the light detector. | 11-10-2011 |
20110299372 | OPTICAL DRIVE - An optical drive according to the present invention can write information on an optical disc, which includes a substrate on which a number of pre-pits ( | 12-08-2011 |
20120117580 | OPTICAL PICKUP AND OPTICAL DISC DRIVE INCLUDING THE OPTICAL PICKUP - According to the present invention, a tracking error signal can be obtained with good stability by the three-beam differential push-pull method even if the track guide groove direction of the optical disc changes as viewed from the objective lens. | 05-10-2012 |
20120155237 | Optical Information Record/Playback Device - An optical information record/playback device of the present invention includes: a light source; a current driver for supplying current to the light source; an optical system for condensing light from the light source onto a recording medium; a monitoring section for monitoring light emission power of the light source; a current driver control section for controlling output current of the current driver; and an arithmetic/control section for controlling an operation of the current driver control section. Before recording information, the arithmetic/control section sequentially conducts a first test light-emission to cause the light source to emit light by using a closed loop circuit and a second test light-emission to cause the light source to emit light by using an open loop circuit, and compares first and second sampling values, which are respectively obtained by sampling the outputs of the monitoring section during the first and second test light-emissions. | 06-21-2012 |
20120257487 | OPTICAL DISC DRIVE - An optical disc drive according to the present invention includes: a laser light source | 10-11-2012 |
20120287766 | OPTICAL PICKUP DEVICE AND OPTICAL DISC DEVICE - When performing recording/reproduction of information for a given recording layer of an optical disc having three recording layers, influences of reflected light from other recording layers are reduced or removed, thus making it possible to obtain a more stable RF signal or focus error signal. | 11-15-2012 |
20120320727 | OPTICAL PICKUP AND OPTICAL READ/WRITE APPARATUS - An exemplary optical pickup comprises: a light source with first and second emission points; an optical branching element which branches light emitted from the first emission point into multiple light beams including a first main beam and first sub-beams and which also branches light emitted from the second emission point into multiple light beams including a second main beam and second sub-beams; an optical system which condenses the multiple light beams produced by the optical branching element onto an optical storage medium, thereby making the first and second main beams form a write light beam spot and a read light beam spot, respectively, on a target recording track on the storage medium and making the first and second sub-beams form reference light beam spots and other light beam spots somewhere on the storage medium other than the target recording track. | 12-20-2012 |
20130077456 | OPTICAL PICKUP AND OPTICAL READ/WRITE APPARATUS - In one embodiment, an optical pickup includes an optical system which forms multiple light beams based on the light emitted from a light source and which converges a write beam and a read beam, thereby forming a main spot and a sub-spot, respectively, on an optical storage medium. This optical system converges the write and read beams onto the optical storage medium so that the main spot moves through the same region on the optical storage medium ahead of the sub-spot. The optical pickup further includes a detector for sensing the write and read beams reflected from the storage medium. The detector includes a first photodiode | 03-28-2013 |
20130077458 | OPTICAL READ/WRITE APPARATUS - In one embodiment, an optical read/write apparatus includes first and second optical pickups | 03-28-2013 |
20130083640 | OPTICAL READ/WRITE APPARATUS - Disclosed is an improved DRAW technique for writing data on an optical storage medium and reading the data in parallel. In obtaining the optical power of a first light source | 04-04-2013 |
20130083641 | OPTICAL PICKUP DEVICE AND OPTICAL READ/WRITE APPARATUS - In one embodiment, the optical pickup device includes: a light source that emits a light beam; a diffractive element that diffracts the light beam and generates a zero-order and ±first-order diffracted light beams; an objective lens that converges the diffracted light beams onto the same track on the storage medium; and a photodetector that receives the diffracted light beams reflected from the storage medium. If a distance from a light beam spot left by the zero-order diffracted light beam on the track to light beam spots left by the ±first-order diffracted light beams on that track is d [μm], the scanning linear velocity of the storage medium is v [m/s], and a time it takes for a phase-change material of the storage medium that has once been melted by the zero-order diffracted light beam to solidify is T [μs], vT≦d is satisfied. | 04-04-2013 |
20130088948 | OPTICAL READ/WRITE APPARATUS - An optical read/write apparatus as an embodiment of the present invention includes: a light-splitting element configured to split a light beam emitted from a light source into multiple light beams including a write beam and a read beam; an optical system configured to converge the write and read beams onto the same track on an optical storage medium; a photodetector including a light receiving element configured to detect the read beam reflected from the optical storage medium and output an electrical signal; and a divider configured to generate a read signal by dividing the signal detected by the light receiving element by a signal that represents a write modulated component and that is obtained by detecting a part of the light beam emitted from the light source. | 04-11-2013 |
20130094338 | OPTICAL PICKUP AND OPTICAL READ/WRITE APPARATUS - An optical pickup includes: a light source; a first diffractive element which diffracts light polarized in a particular direction; an objective lens; a lens actuator which shifts the objective lens so that the magnitude of shift from its initial position in a tracking direction has an upper limit of 0.3 mm to 0.6 mm; a wave plate; a second diffractive element which has two diffraction regions configured to diffract light polarized in a direction that intersects with the particular direction at right angles and which splits the write beam reflected from the optical storage medium through each diffraction region into a transmitted light beam and at least one diffracted light beam; and a photodetector which detects the transmitted light beam, the diffracted light beams that have left the two diffraction regions, and the read beam reflected from the optical storage medium. | 04-18-2013 |
20130107692 | OPTICAL PICKUP AND OPTICAL READ/WRITE APPARATUS | 05-02-2013 |
20130329539 | OPTICAL READ/WRITE APPARATUS - An optical read/write apparatus as an embodiment of the present invention includes: a light-splitting element configured to split a light beam emitted from a light source into multiple light beams including a write beam and a read beam; an optical system configured to converge the write and read beams onto the same track on an optical storage medium; a photodetector including a light receiving element configured to detect the read beam reflected from the optical storage medium and output an electrical signal; and a divider configured to generate a read signal by dividing the signal detected by the light receiving element by a signal that represents a write modulated component and that is obtained by detecting a part of the light beam emitted from the light source. | 12-12-2013 |