Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1981-03-31
1983-11-08
Faber, Alan
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
360 77, 250202, G11B 2110
Patent
active
044146558
ABSTRACT:
A control system for use in controllably adjusting a prescribed characteristic of a beam scanning a record medium. In the preferred embodiments, the control system is embodied in a tracking apparatus for use in a playback system for recovering information from a selected recording track on an optical record medium such as a video disc. The tracking apparatus produces a tracking error signal representative of the deviation of a scanning reading beam from the centerline of the selected track, and couples this error signal to a movable tracking mirror to form a servo for controllably positioning the beam in alignment with the track. The tracking apparatus further includes a dimple compensation circuit for monitoring the tracking error signal and producing a tracking loop disable signal whenever it determines that the reading beam is scanning a video disc defect, such as a dimple. This disable signal is used to uncouple the tracking error signal from the tracking mirror, so that the reading beam is maintained at its current position until the dimple has been passed.
REFERENCES:
patent: 4138663 (1979-02-01), Lehureau
patent: 4268745 (1981-05-01), Okano
patent: 4271334 (1981-06-01), Yardy
patent: 4338682 (1982-07-01), Hosaka
Patent Abstract of Japan, vol. 4, No. 74, 30 May 80, p. 3P13.
Patent Abstract of Japan, vol. 2, No. 37, 13 Mar. 78, p. 102E78.
European Patent Abstract 81200105.5, 9/9/81.
Chudy John S.
Shoji Robert M.
Clark Ronald J.
Discovision Associates
Faber Alan
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