Automatically operated record player system

Details Automatically operated record player system Automatically operated record player system

1976-10-26

1979-01-16

Haroian, Harry N.

Undertaking

274 39R, 274 15R, G11B 360

Patent

active

041345932

ABSTRACT:
A turntable includes nine apertures therethrough arranged in three concentric circles and on three radii of the turntable spaced apart 120.degree. C. Light reflectors are located in the respective apertures and selectively covered with different types of gramophone discs placed on the turntable. During the rotation of the turntable with a gramophone disc the reflectors direct light through the mating apertures to three phototransistors disposed along one radius of the turntable. A logic circuit processes outputs from the phototransistors to set up a rotational speed of the turntable and positions of a tone arm where it is lowered onto and raised from the disc in accordance with a gramophone disc on the turntable. The tone arm is vertically moved by an electric motor through a cam and horizontally swivelled by a reversible electric motor controlled by another logic circuit.

REFERENCES:
patent: 2056372 (1936-10-01), Schwartz
patent: 2370875 (1945-03-01), Pressley
patent: 2952464 (1960-09-01), Stimler
patent: 3179419 (1965-04-01), Churchill
patent: 3549153 (1970-12-01), Atzumi
patent: 3804422 (1974-04-01), Kobashi et al.
patent: 3966330 (1976-06-01), Ridler et al.

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