Electricity: motive power systems – Positional servo systems – Program- or pattern-controlled systems
Patent
1979-01-12
1980-11-18
Truhe, J.
Electricity: motive power systems
Positional servo systems
Program- or pattern-controlled systems
318576, 318640, 360 77, 3581285, 250202, G05B 1933
Patent
active
042348374
ABSTRACT:
A digital servo system for maintaining a detection device, such as a reading beam, as nearly as possible centered with respect to an information track, such as an optical track on a video recording disc. In each of the embodiments disclosed, circuitry is provided to process a signal obtained from the reading beam, to obtain timing signals indicative of transitions of the beam across noncentral switching lines parallel with the track. In one embodiment, a constant-magnitude acceleration signal is applied to a beam position transducer, and is reversed in polarity each time a switching line is crossed after first crossing the centerline. In another embodiment, the polarity of the constant-magnitude acceleration signal is reversed after crossing a switching line a second time and after applying an additional acceleration impulse of relatively short duration. In a third embodiment, an acceleration impulse is initiated when the beam reaches a switching line, and the beam moves at essentially constant velocity when not subject to an acceleration pulse.
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.
Clark Ronald J.
Indyk Eugene S.
MCA Discovision Inc.
Truhe J.
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