Stylus position sensing apparatus for video disc player

Details Stylus position sensing apparatus for video disc player Stylus position sensing apparatus for video disc player

1979-07-09

1981-07-21

Wolff, John H.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

369 61, 369126, 369219, G11B 338

Patent

active

042800234

ABSTRACT:
In a video disc player, a stylus arm, carrying a track-following stylus at one end thereof, has its other end secured to an arm cage by a compliant member. The arm cage is translated along a path disposed radially of the disc record during playback. Pickup circuits are employed for sensing the variations in a signal representative capacitance formed between an electrode incorporated in the pickup stylus and conductive material disposed in the record to recover prerecorded information from a spiral track disposed on the record. A stylus position indicative capacitance, established between a first electrode secured to the stylus arm and coupled to the pickup circuits and a second electrode mounted to the carriage in the vicinity of the first electrode, is modulated at a given frequency rate. Circuitry is provided for sensing signals at a given frequency appearing at the output of the pickup circuits to generate a signal indicative of the position of the pickup stylus relative to the arm cage. The rate of translation of the carriage is varied in response to the stylus position indicative signal to maintain a desired relationship between the pickup stylus and the arm cage.

REFERENCES:
patent: 2915315 (1959-12-01), Rabinow
patent: 3572724 (1971-03-01), Rabinow
patent: 3872265 (1975-03-01), Hilliker
patent: 4080625 (1978-03-01), Kawamoto et al.
patent: 4149730 (1979-04-01), Bois et al.
patent: 4163994 (1979-08-01), Sakamoto et al.
patent: 4164756 (1979-08-01), Toda et al.

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