Optical disk apparatus

Details Optical disk apparatus Optical disk apparatus

1992-12-30

1995-01-17

Dzierzynski, Paul M.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369116, 369 4425, G11B 700

Patent

active

053831748

ABSTRACT:
An optical disk apparatus has a galvanic mirror error signal generation circuit for detecting that the galvanic mirror rotates more than an allowed limit value in directions P and Q. When it is detected by the galvanic mirror error signal generation circuit that the galvanic mirror rotates more than the allowed limit value, the light intensity of the light spot is changed from the recording-use (or erasing-use) light intensity into the reproducing-use light intensity. Accordingly, recording and erasing of information is always carried out by the projection of the light beam having a predetermined light intensity, thereby always providing a high grade of optical disk apparatus.

REFERENCES:
patent: 4544241 (1985-10-01), LaBudde et al.
patent: 4556964 (1985-12-01), Trethewey
patent: 4607356 (1986-08-01), Bricot et al.
patent: 4669072 (1987-05-01), Miura et al.

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