Phonograph record eccentricity tester

Details Phonograph record eccentricity tester Phonograph record eccentricity tester

1975-09-15

1979-08-14

Phillips, Charles E.

Geometrical instruments

Area integrators

Electrical

340686, 274 1R, G01B 700

Patent

active

041640756

ABSTRACT:
A phonograph record groove eccentricity tester senses the eccentricity of the circular groove at the inner side of the spiral groove, by means of a groove engaging stylus on a pivoted arm operating a sensor that produces an output signal a peak value of which is displayed.

REFERENCES:
patent: 2113226 (1938-04-01), Young
patent: 3000005 (1961-09-01), Moyer
patent: 3263163 (1966-07-01), Foster et al.
patent: 3394303 (1968-07-01), Cressman et al.
patent: 3503615 (1970-03-01), Matsuda

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