Control circuit for controlling light source in optical disc dev

Details Control circuit for controlling light source in optical disc dev Control circuit for controlling light source in optical disc dev

1983-01-03

1985-03-26

Faber, Alan

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369106, 369116, 369122, 250205, G11B 700, G11B 2736

Patent

active

045077673

ABSTRACT:
An optical disc device including a semiconductor laser as a light source and making the light output of the semiconductor laser different between an information recording operation and an information reproducing operation is disclosed in which the semiconductor laser is connected in parallel with protection circuit, and in which the protection circuit is put in a short-circuited state between two terminals thereof when a monitor signal corresponding to the light output of the semiconductor laser exceeds a predetermined value.

REFERENCES:
patent: 4051329 (1977-09-01), Blondet
patent: 4283785 (1981-08-01), Miyouchi
"High Density Direct Read After Write (DRAW) Recording" by Pepperl's et al.; Optica Acta, 1977, vol. 24, No. 4, pp. 427-431.

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