Reflective shaft angle encoder

Details Reflective shaft angle encoder Reflective shaft angle encoder

1989-03-10

1990-08-28

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, G01D 534

Patent

active

049527991

ABSTRACT:
An optical shaft angle encoder has a code wheel with alternating reflective and non-reflective areas in a circumferential path on one face of the wheel. A light emitting diode is spaced apart from the reflective areas on the wheel. Four photodetectors are also spaced apart from the same face of the wheel so that, as the wheel rotates, the photodetectors are alternately illuminated or not illuminated by light from the light emitting diode that is reflected from the reflective areas. Preferably the light emitting diode is relatively nearer the shaft axis than the photodetectors and is in a radial direction from the shaft axis which bisects the array of photodetectors.

REFERENCES:
patent: 4031386 (1977-06-01), Recker
patent: 4451731 (1984-05-01), Leonard
patent: 4508965 (1985-04-01), Casciani
patent: 4650995 (1987-03-01), Tokunaga
patent: 4691101 (1987-09-01), Leonard
patent: 4794250 (1988-12-01), Togami

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