Hitachi, Ltd.

Other

Hitachi Maxell, Limited

Nobuhiro Tokushuku

Harukazu Miyamoto

Hiroyuki Minemura

Motoyuki Suzuki

Hisataka Sugiyama

Yoshio Suzuki

Tetsuya Fushimi

Makoto Miyamoto

Motoyasu Terao

Akemi Hirotsune

Yasushi Miyauchi

Tetsuya Nishida

Yukio Fukui

Hitoshi Yanagihara

Kazuo Shigematsu

Keikichi Andoo

Masaaki Kurebayashi

Tetsuya Ikeda

Yoshihiko Noro

Kenji Tokumitsu

Koichi Moritani

Toshifumi Takeuchi

Yoshie Kodera

Yasushi Fukuda

Katsuyuki Tanaka

Katashi Hazama

Keikichi Ando

Reiji Tamura

Takehiko Yorozu

Katsuo Konishi

Yoshihiro Ikari

Masaki Yoshii

Kouichi Moritani

Naomi Suzuki

Naotake Ebinuma

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.

Information recording method

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.

An optical recording 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 radical direction of the medium comprise one zone, the optical medium including a plurality of zones, and the groove structure included in the adjacent units within at least one zone having substantially a same number of wobbling. The method includes providing the optical medium, and recording information on the optical medium by irradiating an optical spot thereon.

A recording method for an optical 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 units, each of the units including a dropout portion of the groove structure which is a non-groove portion along the track in a circumferential direction of the track, the groove structure being wobbled in a fixed cycle in a radial direction which continues in the circumferential direction along the track. 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 providing the optical medium, and recording information by irradiating an optical spot on the medium.

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.

A reproducing apparatus for reproducing information recorded on an optical recording medium having a disk-like substrate, a spiral or concentric-shaped groove structure along tracks formed on the substrate, and each of the tracks being divided into a plurality of recording units. Each of the recording units includes a dropout portion of the groove structure which is a non-groove portion along the track in a circumferential direction of the track, and the groove structure is wobbled in a fixed cycle in a radial direction, which continues in the circumferential direction along the track. 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.

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.

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.

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.

An information 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 disk-like substrate and associated with a plurality of grooves wobbled in a radial direction, and 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 disk-like substrate. The information reproducing 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 optical detector.

An information recording method for a recording medium including a spiral or concentric-shaped groove structure along tracks formed on a disk-like substrate, wherein each of the tracks is divided into a plurality of recording units. Each of the recording units includes a blank portion in a circumferential direction of the groove structure, the blank portion being a non-groove portion, the groove structure being 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 method includes irradiating a light beam to the recording medium, and recording information to the recording medium.

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.

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.

Optical reproducing method

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.

Information recording medium recording data on wobbled groove structure of recording medium

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.

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Yokohama, Japan

Nobuhiro Tokushuku