Optical scanner masking means

Details Optical scanner masking means Optical scanner masking means

1976-11-26

1979-05-08

Cardillo, Jr., Raymond F.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

1791003V, 17910031, 250237R, 250239, 250570, 274 15R, G11B 1706, G11B 2110

Patent

active

041538218

ABSTRACT:
The present invention is directed to an improvement in optical scanners particularly for use on programmable phonograph record players which provide certain automatic features, principally selection of predetermined sound track portions on a record. The invention includes the provision of a mask to improve the performance of an optical scanner having a light emitter and a photodetector mounted on the stylus end of the phonograph tone arm. The mask, such as an opaque coating or thin film sheet, is secured to the face of the optical scanner. The mask includes a pair of apertures which permit a predetermined amount of directed light energy from the light emitter to emanate toward the record surface and be reflected onto a portion of the photodetector to increase the accuracy and performance of the sensor in the recognition of very narrow intraband land areas and precise recognition of very short, or narrow, recorded sound track portions.

REFERENCES:
patent: 2007370 (1935-07-01), Hopkins
patent: 2654810 (1953-10-01), Miessner
patent: 2952464 (1960-09-01), Stimler
patent: 3368080 (1968-02-01), Nakagiri et al.
patent: 3937903 (1976-02-01), Osann, Jr.
patent: 3979588 (1976-09-01), Park

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