Servo system for a videodisc player carriage assembly

Details Servo system for a videodisc player carriage assembly Servo system for a videodisc player carriage assembly

1981-09-22

1983-09-20

Stephan, Steven L.

Dynamic information storage or retrieval

Dynamic mechanism subsystem

Having power driven transducer assembly

369 58, G11B 2104, G11B 1700

Patent

active

044060025

ABSTRACT:
A servo system for a VideoDisc player stylus carrying carriage assembly is described which precludes the servo system entering a hunt mode due to the signal pickup stylus tracking an eccentric signal track. The player comprises a carriage for housing a track following signal pickup stylus compliantly mounted therein. A position detector generates an analog signal proportional to the stylus position relative to a relaxed or centered position. The position signal is converted to a bilevel signal (i.e. relatively positive and relatively negative levels), the two levels corresponding to the stylus being to the right or left of the centered position respectively. The bilevel signal is sampled at regular intervals, e.g. eight, per disc revolution. Counter circuitry counts the number of samples per disc revolution which are at the relatively positive level. The resulting number is examined to determine whether it is greater or lesser than one half the total number of samples per revolution and forward or backward control signals are generated respectively. The control signals are applied to a stepper motor coupled to the carriage for translating the carriage and thereby the stylus radially across the disc.

REFERENCES:
patent: 4198871 (1980-04-01), Dunn et al.
patent: 4249746 (1981-02-01), Mimasu
patent: 4280023 (1981-07-01), Christopher
patent: 4313189 (1982-01-01), McGuffin
patent: 4327434 (1982-04-01), Christopher
patent: 4334276 (1982-06-01), Turnbull
patent: 4340949 (1982-07-01), Kelleher

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