Sony Corporation

Sony Semiconductor Solutions Corporation

Sony Group Corporation

Toshihiro Horigome

Seiji Kobayashi

Kimihiro Saito

Satoru Higashino

Kunihiko Hayashi

Akira Suzuki

Naofumi Goto

Kotaro Kurokawa

Hirotaka Miyamoto

Koji Sekiguchi

Kenji Yamamoto

Goro Fujita

Hideki Ando

Tsutomu Ishimoto

Takao Kondo

Sakuya Tamada

Takashi Iwamura

Kazumine Ito

Joost De Kock

A reproduction apparatus dividing a cross section of superposed light into a plurality of regions in a tangential and/or radial direction includes: an optical system configured to generate each of a first set of signal light and reference light having a phase difference of approximately 0&#xb0;, a second set of signal light and reference light having a phase difference of approximately 180&#xb0;, a third set of signal light and reference light having a phase difference of approximately 90&#xb0;, and a fourth set of signal light and reference light having a phase difference of approximately 270&#xb0;, using a plurality of superposed light beams corresponding to the divided regions; an optical receiver configured to output signals corresponding to the sets of the signal light and the reference light; and a circuit configured to compute signals as differences between the signals, and obtain a reproduction signal by computation from the computed signals.

Reproduction apparatus and reproduction method

There are provided an optical disk from which high-density data is reproduced and a reproduction apparatus that reproduces data from such an optical disk having high-density data recorded thereon. A photo-detecting section has two split detectors A and B in the direction of tracks on the disk. A signal processing section generates a TPP (Tangential Push-pull) signal made of a differential signal derived from detection signals from the detectors A and B, and further generates a reproduced signal by extracting from the TPP signal a high-frequency component signal in a record signal recorded on the disk. The signal processing section reconstitutes a high-frequency component signal in the record signal recorded on the disk by frequency-shifting the TPP signal obtained as a readout signal from a superimposed signal having the carrier signal and the record signal superimposed with each other.

High density optical disk processing apparatus, method, and computer-readable medium

Provided is a reproducing apparatus including: a reproduction signal generating circuit that calculates a first difference signal which is a difference between a first light receiving signal obtained by the first light receiving element and a second light receiving signal obtained by the second light receiving element, and a second difference signal which is a difference between a third light receiving signal obtained by the third light receiving element and a fourth light receiving signal obtained by the fourth light receiving element, and uses the first difference signal, the second difference signal, a phase difference between a crosstalk component and an average phase of the signal light beam, and an optical path length difference between the signal light beam and the reference light beam to obtain a reproduction signal; and a phase extraction circuit that obtains a successive change amount and updates with a successive variation.

Reproducing apparatus and reproducing method

Provided is an optical information recording medium including: a continuously wobbling groove formed in advance by a CAV or a zone CAV. Information is allowed to be recorded on the groove and a land adjacent to the groove, address information is recorded by modulating the wobble, the address information includes a sync pattern indicating a position of the address information and address data, and the sync pattern includes a plurality of first wobble patterns and a second wobble pattern between the first wobble patterns, and at least part of intervals of the first wobble patterns are set to unequal intervals.

Optical information recording medium and optical information recording medium reproducing device

An acceleration sensation presentation apparatus includes: a frame to be worn on the head of a user; at least one or more weights provided to the frame; and a vibration driving unit configured to vibrate the weight to be moved.

Acceleration sensation presentation apparatus, acceleration sensation presentation method, and acceleration sensation presentation system

An information recording medium is provided with an information track formed thereon in a shape of concentric circles or in a spiral shape, wherein a continuously-wobbling groove in which information is recorded is formed in advance, the information is delimited by a predetermined number of wobble sections, a sync mark is placed in a plurality of wobble sections in the vicinity of a delimiter of the predetermined number of wobble sections, and the sync mark is spaced apart from data other than the sync mark at a distance.

Information recording medium, information reproducing method, and information 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.

Optical information recording medium and optical information recording medium reproducing apparatus

An optical-information recording medium includes a groove and a land that are alternately provided. Address information in the groove is recorded by wobbles in the groove, and address information on the land is recorded by a combination of the wobbles in the grooves provided at two opposite sides of the land.

Optical-information recording medium and playback apparatus

An optical drive device includes first and second light sources, an objective lens configured to receive a first light emitted from the first light source and a second light emitted from the second light source and to irradiate both the first light and the second light to an optical disc recording medium, a first focus mechanism configured to drive the objective lens in a focus direction, a second focus mechanism configured to change collimation of the second light incident to the objective lens and changing the focusing position of the second light independently of the first light, a first focus servo control unit configured to drive the first focus mechanism, an error signal subtraction unit configured to subtract the first focus error signal from a second focus error signal, and a second focus servo control unit configured to drive the second focus mechanism.

Optical drive device and focus servo control method

An optical disc apparatus can make the focus of an information light beam converged by an objective lens agree with a target track of a target mark layer of an optical disc by appropriately predefining the distance between the focus of a servo light beam and that of the information light beam with regard to the direction of the thickness and a radial direction of the optical disc by means of the optical pickup of the apparatus and then operating for focus control and tracking control of the objective lens so as to make focus of the servo light beam converged by the objective lens agree with a reference track of a reference mark layer.

Optical disc apparatus, position control method and optical pickup

An optical disc apparatus can highly accurately record a hologram representing information on or reproduce such a hologram from an optical disc. When recording information on an optical disc, the optical disc apparatus controls the position of an objective lens OLaccording to the outcome of detection of a red reflected light beam Lrso as to make the focus Fr thereof follow a target track and it also makes the focus Fbof a blue light beam Lbagree with a target mark position by the objective lens OLand also the focus Fbagree with the target mark position by controlling the position of another objective lens OLaccording to the outcome of detection of the blue light beam Lbby way of the objective lenses OLand OLso as to make the focus Fbof the blue light beam Lband the focus Fbof the blue light beam Lbagree with the target mark position and the blue light beam Lband the blue light beam Lbinterfere with each other. Thus, as a result, the optical disc apparatus can record a recording mark RM at the target mark position.

Optical disc apparatus, focus position control method and recording medium

A focus control section first performs a reference focus control process in which a reference optical beam is focused on a reference layer of an optical disc according to the result of receiving a reference reflection optical beam, and then switches from the reference focus control process to an information focus control process in which an information optical beam is focused on a mark layer of the optical disc according to the result of receiving an information reflection optical beam.

Optical disc device and focus control 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.

Optical disc apparatus, information recording method, and information reproduction 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.

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Kanagawa, Japan

Toshihiro Horigome