Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1986-03-05
1988-06-07
Faber, Alan
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
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: 4642803 (1987-02-01), Drexler
Sakamoto Masaharu
Yamamiya Kunio
Faber Alan
Olympus Optical Co,. Ltd.
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