Detector for distinguishing between recorded and unrecorded band

Details Detector for distinguishing between recorded and unrecorded band Detector for distinguishing between recorded and unrecorded band

1976-08-18

1978-03-14

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

1791003V, 250239, G06K 710

Patent

active

040792617

ABSTRACT:
A detector for scanning the surface of a record on a phonograph turntable to distinguish between recorded and unrecorded bands by detecting physical differences on the record surface. The detector illuminates a portion of the record surface and senses light reflected from such portion with a photoelectric cell. The portion of the record surface from which reflected light is detected is accurately controlled for reliable operation by a lens that focuses such reflected light at and through an aperture. The lens is fixedly mounted a first predetermined distance from the aperture and maintained a second predetermined distance from such portion of the record surface by a wheel that rides on the record surface.

REFERENCES:
patent: 1917003 (1933-07-01), Williams
patent: 2952464 (1960-09-01), Stimler
patent: 3368080 (1968-02-01), Nakagiri et al.
patent: 3937903 (1976-02-01), Osann
patent: 3979588 (1976-09-01), Park

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