Title:
OPTICALLY RECORDING MEDIUM
Document Type and Number:
WIPO Patent Application WO/1992/015092
Kind Code:
A1
Abstract:
An optically recording medium in which by projecting a light beam for reading out signals onto a magneto-optical recording medium having a multilayer film including the record retaining layer and the reproducing layer which is coupled magnetically to the record retaining layer, the signals recorded magnetically in a record retaining layer are transferred to a reproducing layer and the signals are read out through the conversion of the signal to optical signals by the magneto-optic effect. Another optically recording medium in which by projecting a light beam for reading out signals onto an optically recording medium in which phase pits are formed and their reflection factors change with temperature, the reflection factors are varied partially in a scanning spot, and the phase pits are read out. The track pitch (p) of a pit RP, which is a recorded signal, in the direction perpendicular to the scanning direction of a laser beam is a half or less of the diameter D of the spot of the laser beam. Thereby the track density is increased, and the recording capacity of the medium can be increased.
Inventors:
FUKUMOTO ATSUSHI (JP)
UDAGAWA TOSHIKI (JP)
YOSHIMURA SHUNJI (JP)
OHTA MASUMI (JP)
ONO MASUMI (JP)
YASUDA KOUICHI (JP)
UDAGAWA TOSHIKI (JP)
YOSHIMURA SHUNJI (JP)
OHTA MASUMI (JP)
ONO MASUMI (JP)
YASUDA KOUICHI (JP)
Application Number:
PCT/JP1991/001436
Publication Date:
September 03, 1992
Filing Date:
October 18, 1991
Export Citation:
Assignee:
SONY CORP (JP)
International Classes:
G11B7/005; G11B11/105; (IPC1-7): G11B7/00; G11B11/10
Foreign References:
| JPS62177737A | 1987-08-04 | |||
| JPS6450257A | 1989-02-27 | |||
| JPH01143041A | 1989-06-05 | |||
| JPH01143042A | 1989-06-05 |
Other References:
See also references of EP 0525191A4
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