Rotational information output device

Details Rotational information output device Rotational information output device

1985-12-09

1988-03-22

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, G01D 534

Patent

active

047330708

ABSTRACT:
A fixed slit plate and a rotary slit plate which is secured to a rotating shaft are provided between two photoconductive elements and a light emitting element, and the two photoconductive elements provide two outputs which have the phase difference .pi. therebetween. These two outputs thus provided are added to extract the dc component, thereafter exerting feedback control over the light emitting element such that this dc component is maintained at a constant level.

REFERENCES:
patent: 3809895 (1974-05-01), Taisne
patent: 4580047 (1986-04-01), Sasaki et al.
patent: 4593194 (1986-06-01), Graham et al.
patent: 4620094 (1986-10-01), Tani et al.
patent: 4650332 (1987-03-01), Muraoka et al.

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