Tracking system for optical record medium

Details Tracking system for optical record medium Tracking system for optical record medium

1981-03-31

1983-09-20

Faber, Alan

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

250202, G11B 2110

Patent

active

044060009

ABSTRACT:
Tracking apparatus and related method 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 defect detection circuit for monitoring the tracking error signal and producing a pair of control signals that indicate when video disc defects of prescribed types are being scanned, and a threshold detector circuit for comparing the error signal to prescribed positive and negative thresholds that are selectively-variable in accordance with the pair of control signals. A tracking loop disable signal is produced whenever the magnitude of the error signal exceeds either threshold, and 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: 3474418 (1969-10-01), Jensen
patent: 4037252 (1977-07-01), Janssen
patent: 4138663 (1979-02-01), Lehureau
patent: 4268745 (1981-05-01), Okano
patent: 4271334 (1981-06-01), Yordy
patent: 4338682 (1982-07-01), Hosaka
Patent Abstracts of Japan, vol. 1, No. 37, 3/13/78, p. 102E78.
Patent Abstracts of Japan, vol. 2, No. 129, 10/27/78, p. 7876E78.

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