Abstract: An optical reproducing method for an optical medium, including a disk-like substrate, a spiral or concentric-shape 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 and at least two adjacent units in the radial direction of the medium comprise one zone. The optical medium includes a plurality of zones, and the groove structure included in the adjacent units within any zone have 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 using a signal obtained by the reflected beam.

Abstract: An information recording method which use an optical recording medium in which grooves and lands are formed on a substrate with information recording areas being formed in association with both a groove and a land and an address area being formed at the information recording area preceding the groove and the land. First and second address pits are disposed in the address area on an extension of a boundary between the groove and the land with the first and second address pits being disposed so as to satisfy predetermined requirements. Information is recorded on the optical recording medium by irradiating an optical spot on the optical recording medium.

Abstract: An optical reproducing method using an optical medium having a disk-like substrate with plural levels associated with grooves, and a plurality of zones. Each track is divided into a plurality of recording and radially adjacent recording units of a respective zone are delimited by a pair of radial lines joined to form a central angle at an apex proximate to a center of the disk-like substrate. The grooves are wobbled in the radial direction of the disk-like substrate with a length of each recording unit being an integer multiple of a cycle of the wobble, and the integer multiple being the same for the different zones. An optical spot is irradiated on the optical medium, a reflected beam from the optical medium is detected, and information on the optical medium is reproduced by using a signal obtained by the reflected beam.

Abstract: An information reproducing method for an optical recording medium in which grooves and lands are formed on a substrate, information recording areas are formed in association with both a groove and a land, and an address area is formed at the information recording area preceding the groove and the land. First and second address pits are disposed in the address area on an extension of a boundary between the groove and the land and the first and second address pits are disposed to satisfy predetermined requirements.

Abstract: An information recording apparatus for recording information to an optical recording medium including, a disk-like substrate, a spiral or concentric-shaped groove structure along a track formed on a disk-like substrate, the groove structure being wobbled in a radial direction of the optical recording medium, the track being divided into a plurality of recording units in the track direction by at least one radial boundary line, at least two adjacent recording units in the radius direction of the optical recording medium comprise one zone, the optical recording medium including a plurality of zones, and the groove structure included in the adjacent recording units within any zone having substantially the same number of wobbling. The information recording 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.

Abstract: A means for measuring the temperature in the surroundings of a semiconductor laser is provided and, if the temperature is not above a certain level, power correction is performed at high speed by linearly approximating the I-H characteristic according to one item out of reproduction power and multi-pulse recording power, or if the temperature is higher, accurate power correction of the semiconductor laser is accomplished by detecting a plurality of items out of reproduction power and multi-pulse recording power.

Abstract: An optical disk signal processing apparatus retains compatibility with the conventional continuous servo recording technique, and reduces the amount of noise included in a signal played back from the optical disk without the need to decrease the size of the area for recording data, resulting in a drastically increased signal-to-noise ratio. The optical disk signal processing apparatus has a light source, an optical system for leading a light beam generated by the light source, an optical device for converging the light beam output by the optical system and applying the converged beam to the rotating optical disk, a signal detecting optical system for detecting a signal reflected by the rotating disk through the optical device, and a light detecting instrument for converting light produced by the signal detecting optical system into an electrical signal and a data detecting circuit.

Abstract: Because a series of data is recorded continuously, the recording quality of data recorded in course of recording cannot be evaluated. Accordingly, the laser output cannot be controlled properly and there are a deterioration and dispersion of the recording quality. Further, when the recording lasts for a long time, the temperature in the vicinity of laser rises due to the heat from the inside of a disc drive and the recording quality is deteriorated.

Abstract: An information reproducing method for an optical recording medium in which grooves and lands are formed on a substrate, information recording areas are formed in association with both a groove and a land, and an address area is formed at the information recording area preceding the groove and the land. First and second address pits are disposed in the address area on an extension of a boundary between the groove and the land and the first and second address pits are disposed to satisfy predetermined requirements.

Abstract: An information recording apparatus for recording information to an optical recording medium including a disk-like substrate, a spiral or concentric-shaped groove structure along tracks formed on the disk-like substrate, each of the tracks being divided into a plurality of recording units, each of the recording units including a dropout portion of the groove structure along the track in a circumferential direction of the track, the dropout portion being a non-groove portion and the groove structure being wobbled in a fixed cycle in a radial direction, the fixed cycle of the wobble continuing in the circumferential direction along the track. The information recording 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.

Abstract: 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.

Abstract: An information recording apparatus for recording information to an optical recording medium including, a disk-like substrate, a spiral or concentric-shaped groove structure along a track formed on a disk-like substrate, the groove structure being wobbled in a radial direction of the medium, the track being divided into a plurality of recording units in the track direction by at least one radial boundary line, at least two adjacent recording units in the radial direction of the medium comprise one zone, and the groove structure included in the respective recording units within one zone having substantially same number of wobbling. The information recording 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.

Abstract: 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.

Abstract: An optical reproducing method for reproducing information on an optical medium, including a disk-like substrate, a spiral or concentric-shaped groove structure along tracks formed on the disk-like substrate with each of the tracks being divided into a plurality of units including a dropout portion in a circumferential direction of the groove structure. The dropout portion is a non-groove portion. The groove structure is formed with a wobble in a fixed cycled in a radial direction with the fixed cycle of the wobble continuing in the circumferential direction along the track. Each length of the units is an integer multiple of the cycle of the wobble. 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.

Abstract: An information recording/reproducing apparatus for recording information by recording information of a plurality of sectors as one recording unit into an optical information recording medium. A recording area of the optical information recording medium including a plurality of zones, wherein each zone is different in a sector number per round of a track having recording means for recording information of a plurality of sectors into the optical information recording medium, and conducting means for conducting a verify control. The recording and the verify control are completed for each zone when the information of a plurality of sectors is to be recorded over a plurality of zones.

Abstract: An information recording medium including a disk-like substrate with a plurality of tracks extending in a circumferential direction on the disk-like substrate and associated with a plurality of grooves. The grooves are wobbled in a radial direction of the disk-like substrate and each track is divided into a plurality of recording units of circular arc shape extending in the circumferential direction. A zone is provided which includes at least two recording units which are adjacent each other in the radial direction, and radially adjacent recording units of a respective zone are delimited by a pair of radial lines, and central angles formed by the recording units are constant within one zone.

Abstract: An information recording apparatus for recording information to an optical recording medium, including a disk-like substrate, a spiral or concentric-shaped groove structure along tracks formed on the disk-like substrate, each of the tracks being divided into a plurality of recording units, each of the recording units including a dropout portion in a circumferential direction of the groove structure, the dropout portion being a non-groove portion, the groove structure is formed with a wobble in a fixed cycle in a radial direction, the fixed cycle of the wobble continuing in the circumferential direction along the track; and each length of the recording units is an integer multiple of the cycle of the wobble. The information recording 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.

Abstract: A method for reproducing information from an optical medium including a substrate with grooves and lands alternately formed on the substrate in a radial direction. The grooves and the lands both serve as tracks which are divided into units in the circumferential direction. Each unit has a prepit area in a non-groove portion of the substrate with a first prepit being represented as VFO information in the prepit area and a second prepit being represented as address information in the prepit area. The first prepit and second prepit are located on both sides of a center line of one track and are arranged with respect to one another. The method includes irradiating an optical spot on the optical medium, detecting address information, controlling the irradiation position of the optical spot on the basis of the address information and reproducing information.

Abstract: An optical disc apparatus and method for recording and reproducing information to/from an optical disc, including discrimination of the optical disc, reading control information in an un-recordable area formed in an inner periphery of the optical disc, conducting focus control based on a focus error signal in a recordable area formed outside of the un-recordable area, and determining an optimum offset value of the focus error signal in the recordable area. Further, adjustment in amplitude of a reproduced signal from an inner periphery of the recordable area is conducted, test-writing in the inner periphery of the recordable area is conducted, test-writing in an outer periphery of the recordable area is conducted, and adjustment in amplitude of a reproduced signal from the outer periphery of the recordable area is conducted. The respective operations are conducted sequentially so as to make the optical disc in a reproducible and recordable condition.

Abstract: A method for recording information and information recording/reproducing apparatus wherein information of a plurality of sectors is recorded as one recording unit into an optical information recording medium, a recording area of which is constructed with a plurality of zones, each being different in a sector number per one round of track. Information is recorded per one recording unit into the optical information recording medium and a verify control is conducted after the recording of information, wherein a number of recording units for conducting the verify control for each of the zones is changed upon basis of a number of sectors per one round of track and a number of sectors for turning back by the one round of track.