Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1997-03-17
1998-03-10
Tran, Thang V.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369116, 369 58, G11B 709
Patent
active
057269610
ABSTRACT:
An optical pickup control system is provided for recording and reproducing information on various types of discs which have different reflectivities of light. The pickup has a semiconductor laser radiating a laser beam, and a photodetector detecting reflected light from the disc for controlling tracking and focusing of the beam. An automatic laser power control device is provided for controlling the power of the laser beam from the semiconductor laser such that the detected lights by the photodetector become a predetermined value.
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Patent Abstracts of Japan, vol. 10, No. 300, Oct. 14, 1986.
Pioneer Electronic Corporation
Tran Thang V.
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