Optical disk system with laser safety arrangement

Details Optical disk system with laser safety arrangement Optical disk system with laser safety arrangement

1982-04-30

1985-02-12

McElheny, Jr., Donald E.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 58, 369243, G11B 700

Patent

active

044995717

ABSTRACT:
An optical disk apparatus has a detector for detecting absence of an optical disk in a prescribed position, a detection circuit for detecting non-rotation of the disk and an AND circuit for producing a logical product of the outputs from the detector and detection circuit. The detector comprises a light-emitting diode and a light-receiving element. An output signal from the AND circuit is supplied to a beam source driver/control circuit, thereby turning off a beam source.

REFERENCES:
patent: 4032971 (1977-06-01), Camerik
patent: 4196907 (1980-04-01), Takizawa et al.
patent: 4376305 (1983-03-01), Dennis et al.

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