Pick-up head abnormality detector for optical recording/reproduc

Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval

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Details

369122, 369 44, 369 46, G11B 7085, G11B 2736

Patent

active

047501634

ABSTRACT:
A device for detecting the abnormality of an optical pick-up head has a laser diode for emitting a light beam through an optical system to a reference reflective region formed at a predetermined portion of an optical disk, a photosensor for receiving a reflected light from the reflective region through the optical system, and a photosensor for detecting directly the light amount of the laser diode. The difference or a ratio of the detection signals of the photosensors is obtained, and the difference or the ratio is compared with a predetermined value. When the compared result exceeds a predetermined value, the result is decided to be an abnormality of the pick-up head.

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patent: 4145758 (1979-03-01), Drexler
patent: 4363116 (1982-12-01), Kleuters
patent: 4375091 (1983-02-01), Dakins
patent: 4611317 (1986-09-01), Takeuchi
patent: 4627725 (1986-12-01), Nishio
patent: 4642803 (1987-02-01), Drexler

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