Optical disc

Details Optical disc Optical disc

1991-10-28

1993-09-07

Anderson, Bruce C.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

G11B 700

Patent

active

052435903

ABSTRACT:
The present invention is concerned with an optical disc in which a layer of a material undergoing partial phase transitions within a scanning light spot of a readout light so as to be changed in this manner in its optical constants is formed on a base plate, on which phase pits are formed in advance in accordance with information signals, and in which the layer of the material is reset to its initial state, even if the pit period is less than the limit of diffraction, satisfactory reproduction free of crosstalks may be achieved to enable high density recording.

REFERENCES:
patent: 4238803 (1980-12-01), Terao et al.
patent: 4290075 (1981-09-01), Jacobs et al.
patent: 4787077 (1988-11-01), Barton et al.
patent: 4975355 (1990-12-01), Suzuki
patent: 5130971 (1992-07-01), Ohno et al.

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