Optical data recording/reproducing apparatus with optical irradi

Details Optical data recording/reproducing apparatus with optical irradi Optical data recording/reproducing apparatus with optical irradi

1992-07-02

1994-04-19

Chin, Tommy

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369122, 369100, 369 4433, 369 54, G11B 700, G11B 7085

Patent

active

053052986

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 disables emission of a laser beam when a predetermined amount of light is not detected in recording or reproducing mode.

REFERENCES:
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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