Optical rotary encoder

Details Optical rotary encoder Optical rotary encoder

1983-08-10

1987-03-31

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, G01D 534

Patent

active

046545255

ABSTRACT:
An optical rotary encoder includes a slit plate having a plurality of circumferentially aligned slits of a pitch P, a light emitting diode, and a light responsive section. The light responsive section includes four photodiodes formed on a single substrate. The four photodiodes are aligned in the tangential direction of the slit plate with the interval corresponding to 1/4 P. Output signals derived from each of the four photodiodes are introduced into a detection circuit for determining the angular position and velocity of a rotating shaft to which the slit plate is secured.

REFERENCES:
patent: 3304434 (1967-02-01), Koster
patent: 3709611 (1973-01-01), Taisne
patent: 3757128 (1973-09-01), Vermeulen
patent: 3809895 (1974-05-01), Taisne
patent: 4097150 (1978-06-01), Wu
patent: 4118129 (1978-10-01), Grundherr
patent: 4152579 (1979-05-01), Feinland
patent: 4496835 (1985-01-01), Boella et al.

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