Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1988-03-14
1989-07-18
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
250231SE, H01J 4014, G01D 534
Patent
active
048496219
ABSTRACT:
A non-contact, non-electromagnetic, compact, lightweight rotating body rotational-position detecting apparatus in which a disk or ring-shaped light source is spaced from a light receiving plate having thereon a region of photovoltaic material, by a shield plate which is coupled to the rotating body. The shield plate has a light-passing aperture therein so that the area of the photovoltaic material which is exposed to the light source varies with the angular position of the rotating body. The light source, photovoltaic regions, light shield and the shaft carrying the light shield and coupled to the rotating body are coaxial, the voltage produced across the load coupled to each of the photovoltaic regions being a function of the angle of rotation of the rotating body, thus indicating the angular position of the rotating body at any moment.
REFERENCES:
patent: 4238781 (1980-12-01), Vercellotti et al.
patent: 4314153 (1982-02-01), Humphries et al.
patent: 4587485 (1986-05-01), Papiernik
patent: 4637810 (1987-06-01), Babsch et al.
patent: 4737635 (1988-04-01), Uchida
Fujita Koetsu
Yanase Takao
Birchard Bruce L.
Fuji Electric & Co., Ltd.
Messinger Michael
Nelms David C.
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