摘要:
An apparatus for reproducing information recorded on an optical recording medium, including a disk-like substrate, a spiral or concentric-shaped groove structure along tracks formed on the substrate, each of the tracks being divided into a plurality of recording units. Each of the recording units includes a dropout portion in a circumferential direction of the groove structure with the dropout portion being a non-groove portion. The groove structure is formed with a wobble in a fixed cycle in a radial direction which continues in the circumferential direction along the track. Each length of the recording units is an integer multiple of the cycle of the wobble. The apparatus includes an irradiation source for irradiating a light spot on the medium, an optical detector for detecting a reflected light from the medium, and a reproducer for reproducing information by using a signal from the optical detector.
摘要:
A recording method for an optical medium having a disk-like substrate, a plurality of tracks extending in a circumferential direction on the substrate and associated with a plurality of grooves, and a plurality of zones being 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 including at least two tracks, and each track being divided into a plurality of units of circular arc shape extending in the circumferential direction with radially adjacent units of a respective zone being delimited by a pair of radial lines joined to form a central angle at an apex proximate to a center of the substrate. The method includes providing the optical medium, and recording information on the optical medium by irradiating an optical spot thereon.
摘要:
An optical reproducing method for an optical medium including a disk-like substrate having a groove structure along tracks divided into a plurality of units. Each of the units includes a dropout portion of the groove structure along the track which is a non-groove portion. The groove structure is wobbled in a fixed cycle in a radial direction. When the wobble is formed in the circumferential direction of the track, the dropout portion is formed so that a phase of the wobble is continued with a phase of the wobble of the groove structure within another unit adjacent to the dropout portion. The method includes irradiating an optical spot on the optical medium, detecting a reflected beam from the optical medium, and reproducing information on the optical medium by using a signal obtained by the reflected beam.
摘要:
An optical reproducing method for an optical medium including a disk-like substrate, a spiral or concentric-shaped groove structure along a track formed on the disk-like substrate, the groove structure being wobbled in a radial direction of the optical medium, the track being divided into a plurality of units in the track direction by at least one radial boundary line, at least two adjacent units in the radial direction of the optical medium comprise one zone, and the groove structure included in the respective units within one zone having substantially a same number of wobbling. The method includes irradiating an optical spot on the optical medium, detecting a reflected beam from the optical medium, and reproducing information on the optical medium by sing a signal obtained by the reflected beam.
摘要:
Before original information is recorded in areas such as a recording medium management area where the same pattern of information is recorded many times, a dummy pattern that minimizes a recording film flow is recorded. Because the direction of the recording film flow depends on the length of a mark length, the dummy pattern is a pattern including marks with a unique length. Randomly or sequentially selecting and recording a plurality of dummy patterns, each with a recording film flow direction different from others, prevents jitters, which will be caused by the recording film flow, from increasing.
摘要:
An information recording medium having spiral or concentric tracks with a plurality of grooves and lands formed on a disk-like substrate. Each of the tracks is divided into a plurality of recording units and each of the recording units includes a blank portion in a circumferential direction of the track. The track is formed with a wobble in a radial direction and each of the recording units has a length which is an integer multiple of a cycle of the wobble.
摘要:
A video optical disk system which can record/reproduce information in the same recording format as that of a read only type optical disk such as an LD, and is therefore compatible with both the read only type optical disk and a writable optical disk. A writable optical disk exhibiting a C/N ratio of at least 60 [dB] is employed, and has information recorded thereon with the same address signals as those of the LD and in the NTSC direct FM recording format. An optical head and an image processing circuit which are included in a player unit are made common to the recorded disk and the LD, and characteristics of a focusing/tracking control circuit, an RF signal preamplifier circuit and a tilt control circuit which are included in the player unit are changed over on the basis of reflectances of both types of optical disks, thereby enabling both the recorded disk and the LD to be reproduced. The users of the optical disk system can produce original video software by themselves, and can effectively utilize a software stock of read only type optical disks.
摘要:
A recording method for an optical medium having a disk-like substrate with a spiral or concentric-shaped groove structure along a track formed on the substrate. The groove structure is wobbled in a radial direction of the medium and the track is divided into a plurality of units in the track direction by at least one radial boundary line formed by a dropout portion. Identification information is disposed in the track at a head of each recording unit at the dropout portion and the medium is divided into a plurality of zones in a radial direction with a length of a circular arc being substantially the same between the zones in a circumferential direction. At least two adjacent units in the radial direction of the medium comprise one zone. The method includes providing the optical medium, and recording information on the optical medium by irradiating an optical spot thereon.
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 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.