Cueing device for phonographs

Details Cueing device for phonographs Cueing device for phonographs

1975-12-05

1978-03-21

Phillips, Charles E.

Undertaking

G11B 310

Patent

active

040799441

ABSTRACT:
The cueing device, to facilitate the operation of bringing the stylus of a phonograph pickup into engagement with a selected unrecorded zone of a phonograph record, so that the next recorded zone will be played, may include a light source mounted on the pickup for providing a light beam to be reflected from the face of the record to a photoelectric device on the pickup. A utilization device, preferably including a visual signal mounted on the pickup, is operated when the reflected light beam is received by the photoelectric device from the unrecorded zones. The light source, the photoelectric device and the light path therebetween are preferably mounted in a transverse perpendicular plane, transverse to the record grooves and generally perpendicular to the record face. The light reflected by the unrecorded zones is given a polarization in a plane transverse to such transverse perpendicular plane. A polarized light transmitting device, such as means forming a slit, is preferably mounted on the pickup between the record and the photoelectric device and is oriented to favor the transmission of the light polarized by the reflection from the unrecorded zones. The slit may have its longer dimension transverse to the plane of the light path. This construction produces an increased change in the photoelectric signal when the light beam makes a transition between recorded and unrecorded zones.

REFERENCES:
patent: 2615081 (1952-10-01), Hoff
patent: 2952464 (1960-09-01), Stimler
patent: 3368080 (1968-02-01), Nakagiri et al.
patent: 3472374 (1969-10-01), Ness et al.
patent: 3937903 (1976-02-01), Osann

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