摘要:
A method of recording information by irradiating a recording track in an information recording medium with light, the information recording medium comprising a plurality of layers for the recording of information by light irradiation. Each of the layers comprises asperities made up of a groove, the groove in each of the multiple layers having wobbles of a first frequency and wobbles of a second frequency that is different from the first frequency within a single track, wherein the first frequency is constant in each of the layers, and wherein a different signal is obtained from the wobbles of the first and second frequencies in each of the plurality of layers.
摘要:
A recording apparatus for recording information to an optical recording medium having grooves and lands alternately provided in a radial direction, information recording areas being formed in both of the grooves and the lands, and at least one prepit region where no grooves is formed. In the prepit region, first and second information marks are disposed on a virtual extension of respectively a first boundary between one groove and one adjacent land a second boundary between the one groove and an other adjacent land, the first and second information marks being disposed so as not to exist at opposing positions on both of the first and second boundaries of the one groove. The apparatus includes an irradiation source for irradiating a light spot on the optical recording medium, and a controller for controlling an irradiation position of an optical spot from the irradiation source.
摘要:
An optical reproducing method adds a dummy signal to at least a leading or trailing side of a recording signal recorded on an information recording medium. The duty ratio of the dummy signal is not greater than 50%, and the recording start position of the combined recording signal and dummy signal is shifted at random.
摘要:
An optical reproducing method using an optical recording medium having an aligned prepit portion straddled on a plurality of tracks in a radial direction which includes a first and a second prepit portion divided in a track direction. The respective first and second prepit portion are arranged on a boundary of respective tracks and include a synchronous information prepit arranged at every two-track pitch in the radial direction and positioned at opposite boundaries of the same track. A trailing end of the first prepit portion is aligned with the radial direction in arrangement. the method includes irradiating an optical spot on the optical recording medium, detecting a reflected beam from the optical recording medium, and reproducing information on the optical recording medium by using a signal obtained in accordance with the reflected beam.
摘要:
A reproducing apparatus for reproducing information recorded on an optical recording medium including a disk-like substrate, a spiral or concentric-shaped groove structure along a track formed on the substrate, wherein the groove structure is wobbled in a radial direction of the medium. The wobbled groove structure is utilized for recording of recording data, and the track is divided into a plurality of recording units in the track direction by at least one radial boundary line. The apparatus includes an irradiation source for irradiating a light spot on the optical recording medium, an optical detector for detecting a reflected light from the medium, and a reproducer for reproducing information by using a signal from the detector.
摘要:
A reproducing method for reproducing information from an optical recording medium having an aligned prepit portion straddled on a plurality of tracks in a radial direction, the prepit portion including first and second prepit portions divided in a track direction and arranged on a boundary line of the respective tracks. The first and second prepit portions each have address information prepits arranged at every two-track pitch in the radial direction, and the address information prepit of the first and second prepit portions are arranged with one track displaced in the radial direction. A trailing end of an end prepit of the first prepit portion is aligned with the radial direction. The method includes irradiating an optical spot on the medium, detecting a reflected beam from the medium, and reproducing information on the medium by using a signal obtained by the reflected beam.
摘要:
Disclosed here is an apparatus and method for realizing write/read of mass information by reducing cross-talk components that are apt to increase in narrow tracks when various disturbances and variations are recognized. In order to achieve the above object, the apparatus is provided with a plurality of equalizers for correcting frequency characteristics of signals reproduced from a plurality of spots, then outputs from those equalizers are subjected to a computing process to correct tap coefficients of the equalizers sequentially so as to minimize the influence of the subject cross-talk, thereby realizing stable reduction of the cross-talk components.
摘要:
A reproducing apparatus for reproducing information recorded on an optical recording medium including a disk-like substrate, a spiral or concentric-shaped groove structure along a track formed on the substrate, and the groove structure being wobbled in a radial direction of the medium. The track is divided into a plurality of recording units in the track direction by at least one radial boundary line formed by a dropout portion, wherein identification information is disposed in the track at a head of each recording unit at the dropout portion. The apparatus includes an irradiation source for irradiating a light spot on the optical recording medium, an optical detector for detecting a reflected light from the medium, and a reproducer for reproducing information by using a signal from the detector.
摘要:
A recording apparatus for recording information to an optical recording medium having an aligned prepit portion straddled on a plurality of tracks in a radial direction, which prepit portion includes first and second prepit portions divided in a track direction. A prepit of the respective first and second prepit portions is arranged on a boundary of the respective tracks. The first prepit portion has an address information prepit and a synchronous information prepit and the second prepit portion has synchronous information prepit, the prepit of the first and second prepit portions being arranged at every two-track pitch in the radial direction and with one track displaced in the radial direction. The apparatus includes an irradiation source for irradiating a light spot on the optical recording medium, and a controller for controlling an irradiation position of an optical spot from the irradiation source.
摘要:
A reproducing apparatus for reproducing information recorded on an optical recording medium including a disk-like substrate, a plurality of tracks extending in a circumferential direction on the substrate and associated with a plurality of grooves, with a plurality of zones provided on the disk-like substrate and extending between a first position and a second position in a radial direction of the substrate. Each zone includes at least two tracks with each track being divided into a plurality of recording units of circular arc shape extending in the circumferential direction. The apparatus includes an irradiation source for irradiating a light spot on the optical recording medium, an optical detector for detecting a reflected light from the medium, and a reproducer for reproducing information by using a signal from the detector.