System for recording information on an optical recording medium

Details System for recording information on an optical recording medium System for recording information on an optical recording medium

1990-04-27

1992-11-03

Envall, Jr., Roy N.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 48, G11B 700

Patent

active

051611449

ABSTRACT:
In an information recording system, a semiconductor laser is energized in response to a drive current which is modulated in accordance with a recording signal in a recording mode so that a modulated laser beam is generated from the semiconductor laser. The modulated laser beam is focused on an optical disk and is reflected from the optical disk and the reflected laser beam is detected by an photo-detector. A detection signal from the detector is compared with a predetermined threshold level by a binary circuit and a relationship between the recording signal and an output signal from the binary circuit is detected by a detection circuit. In a overwrite mode in which the laser beam is focused on a pit or pits on the optical disk, an overwrite detection signal is generated from the detection circuit and the overwrite detection signal is counted by a counter circuit. When the counter circuit counts a predetermined count value, the counter circuit generates a recording inhibition signal for preventing the semiconductor laser from generating the modulated laser beam.

REFERENCES:
patent: 4308612 (1981-12-01), Miyauchi et al.
patent: 4546462 (1985-10-01), Kaishi et al.
patent: 4831611 (1989-05-01), Sasaki et al.
Patent Abstracts of Japan, unexamined applications, P. Field, vol. 11, No. 109, Apr. 7, 1987-The Patent Office Japanese Government (p. 115 P 564)-Kokai-no. 61-258 335 (Toshiba Corp.).
Patent Abstracts of Japan, unexamined applications, P Field, vol. 12, No. 46, Feb. 12, 1988-The Patent Office Japanese Government (p. 112 P 665)-Kokai-No. 62-192 938 (Canon Inc.).
EP-A2-0 289 304 (Sharp K. K.) FIG. 1; abstract.

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