Phase change type optical recording apparatus and optical record

Details Phase change type optical recording apparatus and optical record Phase change type optical recording apparatus and optical record

1995-10-26

1997-09-30

Edun, Muhammad N.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 54, 369109, 3692754, G11B 700

Patent

active

056732481

ABSTRACT:
An optical recording apparatus that rewrites recorded information on a modified constant angular velocity type phase change optical disk by overwriting using at least a recording light beam, erasing light beam and off-pulse light beam irradiation. The apparatus comprises a semiconductor laser for irradiating the optical disk with the light beam and a control unit for controlling the intensities P1, P2 and P3, wherein P1>P2>P3, of the light beam with which the optical disk is irradiated and their irradiation periods .tau.1 and .tau.3 to obtain a relation of

REFERENCES:
patent: 4939717 (1990-07-01), Ohno et al.
patent: 5430696 (1995-07-01), Tokita et al.
patent: 5463600 (1995-10-01), Kirino et al.
patent: 5485449 (1996-01-01), Nakajo

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