Abstract: 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°, a second set of signal light and reference light having a phase difference of approximately 180°, a third set of signal light and reference light having a phase difference of approximately 90°, and a fourth set of signal light and reference light having a phase difference of approximately 270°, 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.

Abstract: 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°, a second set of signal light and reference light having a phase difference of approximately 180°, a third set of signal light and reference light having a phase difference of approximately 90°, and a fourth set of signal light and reference light having a phase difference of approximately 270°, 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: An acceleration sense presentation apparatus includes a vibrator group including a plurality of vibrators; an input unit to which information having directivity is inputted; and a vibration control unit for continuously switching a vibrator to be vibrated based on the information having directivity.

Abstract: An acceleration sensation presentation device which is attached to a vicinity of head of a user, the device including one or a plurality of spindles; and a spindle driving unit which generates a force in a direction different from a predetermined direction by moving the spindle in the predetermined direction.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.