Phonograph record detecting arrangement

Details Phonograph record detecting arrangement Phonograph record detecting arrangement

1974-11-27

1976-06-29

Grimm, Siegfried H.

Optics: measuring and testing

Angle measuring or angular axial alignment

With photodetection remote from measured angle

250571, 274 15R, 274 39R, 356201, 356209, G11B 360, G11B 1704

Patent

active

039663302

ABSTRACT:
The presence and size of a recorded disc on a turntable is detected and indicated by the interruption of a beam or beams of energy which passes in the plane of the disc, through a hole or holes in a turntable, or beneath the turntable.

REFERENCES:
patent: 3368080 (1968-02-01), Nakagiri et al.
patent: 3804422 (1974-04-01), Kobashi et al.

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