Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1979-08-08
1981-05-19
Nelms, David C.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
250204, G01J 136
Patent
active
042687454
ABSTRACT:
A tracking servo drawing device in an optical type information reading device utilizes a tracking servo to allow an irradiation light beam to track a record track on an information record surface to read information by using said irradiation light beam illuminating said record surface. A speed detection circuit is used to sense a relative speed of the record track and the irradiation light beam at which the irradiation light beam goes across the video track. When the relative speed is lower than predetermined value, a first detection signal is produced. A signal level detection circuit detects the reproduction signal level of the information. When the level reaches a predetermined value, a second detection signal is produced. When the first and second detection signals are produced simultaneously an instruction signal is generated to close the servo loop of said tracking servo means.
REFERENCES:
patent: 4059841 (1977-11-01), Bricot et al.
patent: 4097730 (1978-06-01), Korpel
patent: 4160270 (1979-07-01), Goldschmidt et al.
patent: 4165519 (1979-08-01), Goto
Nelms David C.
Universal Pioneer Corporation
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