Patent application number | Description | Published |
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 |
20100322062 | OPTICAL PICKUP AND OPTICAL DISC DEVICE - An optical pickup includes: a light source that emits a light beam; an object lens that focuses the light beam on an optical disc having a recording layer formed of a fluorescent recording material and a reflecting section adjacent to the recording layer, the recording layer generating, according to presence or absence of a recording mark representing information, a reproduction light beam having wavelength different from that of the light beam when the light beam is irradiated thereon from the light beam, and the reflecting section reflecting the light beam; a wavelength selecting element that separates, from the reproduction light beam, a reflected light beam reflected by the reflecting section of the optical disc and having wavelength equivalent to that of the light beam; and a reflected light detector that receives the reflected light beam separated by the wavelength selecting element and generates a position detection signal. | 12-23-2010 |
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 |
20110007619 | OPTICAL DISC APPARATUS AND TRACKING CONTROL METHOD - An optical disc apparatus includes: a rotation section to rotate an optical disc including a spiral or concentric track with a predetermined track center, with a rotational center of the optical disc as the center; a light source to emit a light beam; an objective lens to collect the light beam on the optical disc; a lens drive section to drive the objective lens in a tracking direction; a light-receiving section to receive a reflected light beam and generate a light-receiving signal; a tracking error signal generation section to generate a first tracking error signal based on the light-receiving signal; an eccentric-state acquisition section to acquire an eccentric state of the track center; a correction section to generate a corrected tracking error signal; and a drive control section to drive the objective lens in the tracking direction by the lens drive section based on the corrected tracking error signal. | 01-13-2011 |
20110096648 | OPTICAL DRIVE DEVICE AND TILT DETECTION METHOD - An optical drive device for performing information recording or reproduction of recorded information by formation of a mark by focusing a first light at a necessary position in a recording layer of an optical recording medium by an objective lens includes a position control unit configured to focus a second light on a reflection film, in which a position guide element of the optical recording medium is formed, through the objective lens and to enable the spot position of the second light to follow the position guide element based on the reflected light of the second light focused on the reflection film so as to control the position of the objective lens. The optical drive device further includes a first focusing unit, a first light-sensing portion, and a surface reflection light deviation amount detection unit. | 04-28-2011 |
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 |
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 |
20110134742 | PICKUP APPARATUS, OPTICAL RECORDING AND REPRODUCTION APPARATUS, AND RECORDING AND REPRODUCTION METHOD - A pickup apparatus includes a light source; a light separator; an object lens that concentrates the light which penetrated the light separator on the optical recording medium; a movable lens; and a light sensing element that receives the reflected light from the optical recording medium separated by the light separator, wherein a coma aberration generated by the transverse shift of the object lens is corrected by a coma aberration which is generated by the deviation of a spherical aberration generated in an optical path from the light source to the object lens and a spherical aberration generated in an optical path from the object lens to a light concentration position on the optical recording medium which are due to the transverse shift. | 06-09-2011 |
20110242951 | OPTICAL PICKUP, OPTICAL DRIVE APPARATUS, AND LIGHT ILLUMINATION METHOD - There is provided an optical pickup including: an optical-system having an object-lens illuminating a first light for information recording or reproducing on a recording layer as a target and a second light on an optical-recording medium including a reference plane having a reflection-layer and the recording-layer at a layer position different from that of the reference-plane and on which information recording is performed through mark formation, and a focus-aligned-position-adjusting unit adjusting a focus-aligned position of the first light through the object-lens by changing collimation thereof incident to the object-lens; and a focusing-mechanism driving the object-lens in a focusing direction, wherein, when a depth of focus λ/NA | 10-06-2011 |
20120063287 | OBJECTIVE LENS, OPTICAL PICKUP, AND OPTICAL DRIVE DEVICE - Provided is an objective lens, which is provided in an optical pickup including a spherical aberration correction mechanism which performs a spherical aberration correction with respect to laser light applied to a recording layer of an optical recording medium, having the recording layer on which information can be recorded at a plurality of positions in a depth direction, via the objective lens, and a tilt correction unit which varies a lens tilt angle which is a tilt angle of the objective lens, thereby performing a tilt correction. | 03-15-2012 |
20120127848 | RECORDING MEDIUM, METHOD OF INITIALIZING THE SAME, INITIALIZING DEVICE, AND REPRODUCING METHOD - There is provided a method of initializing a recording medium having a first surface and a second surface which face to each other with a recording layer in between. The method includes forming interference patterns to have a pitch wider than λr/2N by applying initializing light of a plane wave with a wavelength λf to the recording layer from both of the first surface side and the second surface side, where λr is a wavelength of reproducing light applied to the recording layer at the time of reproducing recorded information, and N is an average refractive index of the recording layer. | 05-24-2012 |
20120147725 | REPRODUCING APPARATUS AND REPRODUCING METHOD - A reproducing apparatus includes: a first laser irradiation section irradiating an optical recording medium having a bulk recording layer and recording marks formed by focusing a laser beam on each predetermined layer position in the recording layer, with a first laser beam through an objective lens; a focus position adjusting section adjusting a focus position of the first laser beam; a beam receiving section receiving a reflected beam of the first laser beam from the marks and generating a light receiving signal; a reproducing section reproducing information recorded with the marks based on the light receiving signal; and a control section performing control to allow the focus position in reproduction of the information to correspond to a position shifted by a certain distance to an upper layer side from a focus position of the laser beam in forming the mark at the layer positions as a reproducing object. | 06-14-2012 |
20120163141 | OPTICAL DISK DEVICE, OPTICAL PICKUP, AND OPTICAL RECORDING MEDIUM - The present invention can properly correct spherical aberration. | 06-28-2012 |
20120182851 | OPTICAL RECORDING MEDIUM AND RECORDING METHOD - Techniques for recording and reading information to/from a recording medium based on positions of a plurality of marks are described herein. Each of the plurality of marks may have the same length. The information may be recorded based on a mark interval between successive marks. Apparatus and a recording medium suitable for use with such techniques are also disclosed. | 07-19-2012 |
20120188864 | RECORDING MEDIUM AND REPRODUCING APPARATUS - A recording medium includes a photosensitive layer, a nonphotosensitive layer, and a recording layer formation region in which the photosensitive layer and the nonphotosensitive layer are laminated. The photosensitive layer includes a recording layer in which interference fringes formed in parallel with a recording medium surface are deleted or changed within a portion irradiated with focused light to record information or light reflected during irradiation of focused light is used to reproduce information. | 07-26-2012 |
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 |
20130010583 | OPTICAL PICK UP, OPTICAL DRIVE DEVICE, AND LIGHT IRRADIATION METHOD - The present invention relates to an optical pick, an optical drive device, and a light irradiation method capable of suppressing a generated amount of shift Δx of a spot position. | 01-10-2013 |
20130142028 | OPTICAL RECORDING MEDIUM, MANUFACTURING METHOD FOR OPTICAL RECORDING MEDIUM - The present disclosure relates to an optical recording medium and a manufacturing method for an optical recording medium capable of obtaining an appropriate reproduction signal, as a bar code-shaped recording region (BCA) on an optical recording medium. | 06-06-2013 |
20130322228 | OPTICAL INFORMATION RECORDING MEDIUM AND OPTICAL INFORMATION RECORDING MEDIUM REPRODUCING APPARATUS - An optical information recording medium of a CAV or a zone CAV, in which a groove wobbling continuously is formed in advance so as to record information to a groove and a land abutting the groove, the groove alternately has a first wobble position in which a wobble fundamental wave form has been modulated by groove address information, and a second wobble position of the wobble fundamental wave form, and in grooves of both sides by which the land is interposed, the first wobble position and the second wobble position are different from each other in position. | 12-05-2013 |
20130342885 | DISPERSION COMPENSATION OPTICAL APPARATUS AND SEMICONDUCTOR LASER APPARATUS ASSEMBLY - Disclosed is a dispersion compensation optical apparatus including a first transmission type volume hologram diffraction grating and a second transmission type volume hologram diffraction grating. The first and second transmission type volume hologram diffraction gratings are arranged facing each other. A sum of an incident angle of laser light and an emitting angle of first-order diffracted light is 90° in each of the first and second transmission type volume hologram diffraction gratings. | 12-26-2013 |
20140036651 | REPRODUCING DEVICE AND REPRODUCING METHOD - A reproducing device includes a light generation and emission unit that obtains signal light as reflection light, which reflects recording signals of a land and a groove, by irradiating an optical recording medium with light and generates reference light so as to emit the signal light and the reference light in a superposed manner, a detection optical system that generates a first combination of signal light and reference light, a second combination of signal light and reference light, a third combination of signal light and reference light, and a fourth combination of signal light and reference light respectively, a light receiving unit in which the first to fourth combinations of signal light and reference light are respectively received by first to fourth light receiving elements, and a reproduction unit that reproduces the recording signals of the land and the groove on the basis of first to fourth light receiving signals. | 02-06-2014 |
20140044940 | OPTICAL RECORDING MEDIUM AND METHOD FOR MANUFACTURING OPTICAL RECORDING MEDIUM - An optical recording medium includes a first transparent film layer, a second transparent film layer, and a recording material layer sandwiched between the first transparent film layer and the second transparent film layer. The recording material layer includes a hologram recording material. | 02-13-2014 |
20140064050 | SKEW DETECTION METHOD AND OPTICAL DISC DEVICE - There is provided a skew detection method including supplying reproduction signals, which are respectively reproduced approximately simultaneously from at least two tracks including a first adjacent track and a second adjacent track located on both sides of a main track, to first and second filters, causing a combining unit to combine output signals of the first and second filters with a reproduction signal which is reproduced from the main track approximately simultaneously with the first adjacent track and the second adjacent track so as to cancel crosstalk, causing a coefficient control unit to obtain an error with a target value of the output signal of the combining unit and control coefficients of the first and second filters so as to reduce the error, and detecting a skew of an optical disc from values of coefficients of predetermined taps of the first and second filters. | 03-06-2014 |
20140068642 | OPTICAL PICKUP AND OPTICAL DISC DEVICE - There is provided an optical pickup including a light source, an objective lens configured to focus light from the light source onto one signal face of an optical disc, the optical disc including two or more signal faces, each of the signal faces having a groove formed therein, a photodetector configured to receive returning rays from the optical disc, the photodetector having a light receiving face divided into four light receiving regions by a dividing line that is substantially parallel to a track direction of the optical disc and by a dividing line that is substantially perpendicular to the track direction, and a shading unit disposed at an incident side of the photodetector and configured to block, of returning rays from a signal face other than the one signal face of the optical disc, at least a diffracted ray that is diffracted by the groove. | 03-06-2014 |
20140140185 | PLAYBACK DEVICE AND PLAYBACK METHOD - There is provided a playback device including a light source, an objective lens that radiates light emitted onto an optical recording medium, and onto which is incident reflected light obtained from a recording surface of the optical recording medium, a condenser lens that condenses the reflected light, a photodetecting section configured to, provided that a confocal position is a focal position of the condenser lens, λ is a wavelength of light radiated onto the optical recording medium, and NA is a numerical aperture of the objective lens, extract and detect light within a range of a diameter less than 1.5λ/NA centered on an optical axis at the confocal position, and a phase difference imparting section that imparts a designated phase difference between a reflected light component from a readout track and a reflected light component from a track neighboring the readout track. | 05-22-2014 |
20140355404 | OPTICAL MEDIUM REPRODUCING APPARATUS AND OPTICAL MEDIUM REPRODUCING METHOD - An optical medium reproducing apparatus that optically reproduces an optical medium on which a plurality of tracks is formed in which a beam returning from the optical medium is divided into a first region of an outside portion and a second region of an inside region, according to the shape of the pupil of an object lens, and crosstalk between the tracks is reduced by using a first detection signal of the first region and a second detection signal of the second region. | 12-04-2014 |
20150036472 | REPRODUCING APPARATUS AND REPRODUCING METHOD - Provided is a reproducing apparatus including: an optical system that obtains a signal light by radiating light emitted from a light source and generates a reference light from the light emitted from the light source, with respect to a recording medium, and that generates first to fourth groups of the signal light beams and the reference light beams, with respect to the superposed light in which the signal light and the reference light are superposed onto each other; a light receiving unit that receives light beams of the first to fourth groups of the signal light beams and the reference light beams respectively through first to fourth light receiving elements; and a reproduction signal generation circuit that calculates a first differential signal and a second differential signal, and that generates a reproduction signal by performing an arithmetic operation using the first and second differential signals. | 02-05-2015 |