Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1983-05-31
1986-04-01
McElheny, Jr., Donald
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 32, 369 48, G11B 700, G11B 2110
Patent
active
045802556
ABSTRACT:
A servo circuit for a signal reproducing apparatus for reproducing signals from a record medium such as a disc utilizing an optical pickup, wherein a variable gain amplifier is arranged in a servo loop between a pickup and an actuator so that the pickup is caused to track a signal track in accordance with a servo error signal produced by the variable gain amplifier. A playback condition of a disc is discriminated by detecting the number of errors in a signal reproduced from a recorded signal on the disc by the pickup, and a gain of the variable gain amplifier is controlled by the discrimination output so that the variation of the servo error signal caused by a difference in reflectance between individual discs is eliminated and a loop gain appropriate to an individual disc is automatically set.
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Arai Takao
Baba Tatsuo
Fukui Yukio
Inoue Shigeki
Nakagaki Harushige
Hitachi , Ltd.
McElheny Jr. Donald
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