Servo system in data reading apparatus

Details Servo system in data reading apparatus Servo system in data reading apparatus

1984-03-15

1988-05-31

Psitos, Aristotelis M.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 46, G11B 7095

Patent

active

047486104

ABSTRACT:
A servo system for controlling the position of a reading beam in an optical video disc player or the like in which an offset signal for cancelling an offset in an error signal used for controlling the position of the reading beam is eliminated when the level of the reading signal falls below a predetermined level. Accordingly, erroneous operations such as defocusing and track jumping are prevented when the reading beam crosses scratches, dust, smudges or the like on the recording medium.

REFERENCES:
patent: 4406000 (1983-09-01), Shoji et al.
patent: 4512002 (1985-04-01), Kosaka et al.
patent: 4561080 (1985-12-01), Yamazaki
patent: 4587644 (1986-05-01), Fujiie

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