Method and apparatus for indicating angular displacement

Details Method and apparatus for indicating angular displacement Method and apparatus for indicating angular displacement

1975-09-03

1977-06-28

Stephan, Steven L.

Undertaking

250230, 250237G, G11B 310, G01D 530

Patent

active

040321584

ABSTRACT:
A tone arm for a record player having a mirror at one end is provided. Opposite the mirror are a light source and two detector elements. When the tone are pivots from a desired angle light from the source is reflected upon the element more than on the other. The mirror is convexly curved so that pivotal motions of the tone arm in one plane will not affect the amount of light reaching the detectors.

REFERENCES:
patent: 2113436 (1938-04-01), Williams
patent: 2651019 (1953-09-01), Fink
patent: 3535538 (1970-10-01), Filloux
patent: 3572724 (1971-03-01), Rabinow
patent: 3768911 (1973-10-01), Erickson
patent: 3850435 (1974-11-01), Birch
The Servo Groove Tracker, A. G. Johnson, Audio, May 1966, pp. 21, 22.

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