Digital center tracking system

Electricity: motive power systems – Positional servo systems – Program- or pattern-controlled systems

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318640, 360 77, 250202, G05B 1933

Patent

active

042361052

ABSTRACT:
A digital servo system for maintaining a detection device, such as a light beam, centered as closely as possible over an information track, such as an optical track on a video recording disc. The servo system includes circuitry for detecting when the light beam traverses a switching line, which, in the illustrative embodiment, is the track centerline, for applying a constant-magnitude acceleration force to deflect the beam to a corrected position, and for reversing the polarity of the acceleration force when the beam traverses the switching line.

REFERENCES:
patent: 3994016 (1976-11-01), Moghadam
patent: 4037252 (1977-07-01), Janssen
patent: 4063287 (1977-12-01), Van Rosmalen
patent: 4138741 (1979-02-01), Hedlund et al.
patent: 4160270 (1979-07-01), Goldschmidt et al.

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