Pioneer Electronic Corporation

Nobuaki Onagi

Takamasa Yoshikawa

Shinichiro Suzuki

Nobuyasu Negishi

Kiyohide Ogasawara

Takahiro Kobayashi

Seiro Fujii

Fumihiko Yokogawa

Takanobu Higuchi

Masataka Yamaguchi

Satoshi Jinno

Masayasu Yamaguchi

Masayasu Yamaguchi, Deceased

An optical disk includes: a substrate shaped in a disk, and having a recording surface; a plurality of recording tracks formed substantially coaxially on the recording surface; a plurality of information pits, which are reproducible by a super resolution reproduction, recorded on the plurality of recording tracks in a recording operation of the optical disk; and an address pit for address reproduction formed in advance to the recording operation on the recording surface with respect to one set of recording tracks adjacent to each other in a radial direction of the optical disk.

Super resolution information reproduction by tracking address information in normal resolution

An optical recording medium includes: a substrate on which information is recorded as phase pits, and a polarization state varying layer for rotating a polarization state of a light beam irradiated thereon in accordance with a temperature distribution caused by irradiation of the light beam. A device for reproducing information recorded on the optical recording medium includes: light irradiation unit for irradiating a read-out light beam to produce a light spot on the optical recording medium so that a light intensity of the light beam at a first portion of the light spot is higher than a predetermined level, separation unit for separating a component of light beam having a predetermined polarization state from a light beam reflected by the optical recording medium, light receiving unit for receiving the light beam separated by said separation means and generating read-out signal, and reproducing unit for reproducing information recorded on the optical recording medium on the basis of the read-out signal.

Optical recording medium and device for reproducing the same

The magneto optical disc is provided with at least first and second recording layers such that the record information is recorded to the first recording layer at a vertically magnetized state thereof and is also recorded to the second recording layer at a vertically magnetized state thereof. The information recording method of recording record information to the magneto optical disc is provided with the steps of: controlling an output power of a recording light; irradiating the recording light to the record position; and applying, while irradiating the recording light to the magneto optical disc, to the record position, an external magnetic field.

Method of and apparatus for recording information to magneto optical

A magneto optical disc, is provided with: a record layer to which information is recorded in a perpendicular magnetization condition; a switch layer, which perpendicular magnetic anisotropy is reduced at a room temperature and is increased at a temperature close to a predetermined reproduction temperature; and a reproduction layer opposed to the record layer through the switch layer to have a switched connection with the record layer by the switch layer.

Magneto optical disc, apparatus for reproducing the same and method of

An optical disc has a plurality of tracks arranged in a radical direction of the disc. On each track, a plurality of servo areas for recording servo information and a plurality of data areas for recording data information are provided. A heat blocking band is provided between adjacent tracks in the data area for preventing heat from transmitting to the data area.

Optical disc with heat blocking bands between tracks

A magneto-optical recording medium includes: a mask layer having a first compensation temperature higher than a predetermined reproduction temperature and lower than a predetermined first recording temperature, a first Curie temperature higher than a predetermined second recording temperature and a first coercive force, and for storing information assigned to magnetizing directions; and an information recording layer having a second compensation temperature higher than the reproduction temperature and lower than the first compensation temperature, a second Curie temperature lower than the second recording temperature and a second coercive force, and for storing information assigned to magnetizing directions.

Exchange coupling optical recording medium and recording/reproducing

Method and apparatus for recording information on an overwritable optical disk in which data is recorded on the disk with a writing beam spot while shifting the writing beam spot in a radial direction by a pitch smaller than the diameter of the writing beam spot for each rotation of the disk. In a reading operation, a reading beam having a shorter wavelength than that of the writing beam is used to read recorded data.

Optical recording method and apparatus therefor

Super resolution information reproduction by tracking address

An optical recording disk includes a light transmissive substrate, a recording film disposed on the substrate directly or through an intermediate layer and a protection film disposed on the recording film. The protection film consists of a dielectric material and the entirety of an upper flat surface and a side surface of the recording film is integrally covered with the dielectric material protection film.

Optical recording disk and production process therefor

An optical recording disk in which a transfer layer having grooves made of ultraviolet setting resin is laminated on the surface of a substrate, and in which a recording layer is laminated on the transfer layer, the optical recording disk comprises a peeling protrusion projectingly provided on the inner circumferential side of the transfer layer.

Optical recording disk and manufacturing method thereof

A magneto-optical recording disk comprises a transparent substrate on which a magneto-optical recording layer made of a rare earth-transition metal alloy having an uniaxial magnetic anisotropy is sandwiched by a pair of dielectric layers is characterized that the dielectric layers are deposited in an amorphous state by means of a low pressure sputtering method.

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Tsurugashima, Japan

Nobuaki Onagi