Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1978-02-14
1980-06-10
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250237R, G01D 534
Patent
active
042074630
ABSTRACT:
As a substitute for the conventionally used pair of polarizer panels, a sensor disc is used in relatively rotatable combination with a pair of photo-sensitive elements arranged spatially on one side of the sensor disc and a light source system arranged spacially on the other side of the sensor disc. The optical transmittancy of the sensor disc changing either continuously and/or discontinuously in a selected diametral direction. The difference in the incident optical quantity caused by relative rotation of the disc and the elements causes generation of corresponding output from a detecting mechanism electrically coupled to the elements. The wide range of the detectable rotation angle enables advantageous use of the sensor for a navigation course finder, linear tracking arm system for record players, automatic steering system and weighing balance.
REFERENCES:
patent: 3171034 (1965-02-01), Tomasolo et al.
patent: 3689079 (1972-09-01), Matsuda et al.
patent: 3853191 (1974-12-01), Yamagiwa
patent: 3875405 (1975-04-01), Ferguson
Nelms David C.
Nippon Gakki Seizo Kabushiki Kaisha
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