Optical data recording/reproducing apparatus including device fo

Details Optical data recording/reproducing apparatus including device fo Optical data recording/reproducing apparatus including device fo

1989-09-26

1992-06-30

Envall, Jr., Roy N.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 32, 369 4433, 369 54, 369100, G11B 1300, G11B 700

Patent

active

051269937

ABSTRACT:
In an apparatus for optically recording data on and reproducing it from an optical disk, the level of a laser beam in reproducing mode is subjected to feedback control and the level of a laser beam in recording mode is controlled in accordance with the output of a capacitor which stores the level of the laser beam in reproducing mode. This apparatus monitors the output of a photodetector in a feedback circuit, which receives reflection light from the optical disk, and a current flowing through a drive transistor for supplying a drive signal to the laser source. When a large amount of light or a large drive current is detected in a standby mode or in a period in which the optical disk is rotated in a low speed, emission of the laser beam is disabled and the kind of malfunction is recorded.

REFERENCES:
patent: 4499571 (1985-02-01), Yokota
patent: 4507767 (1985-03-01), Takasugi
patent: 4509156 (1985-04-01), Ohara et al.
patent: 4730290 (1988-03-01), Takasago et al.
patent: 4750161 (1988-06-01), Takeuchi et al.
patent: 4858219 (1989-08-01), Yoshikawa

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