Optical rotary encoder with light monitoring and control

Details Optical rotary encoder with light monitoring and control Optical rotary encoder with light monitoring and control

1985-02-19

1988-02-16

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250231SE, G01J 132

Patent

active

047257237

ABSTRACT:
An optical rotary encoder comprises reflecting portions and nonreflecting portions provided alternately on a peripheral surface of a measured body freely rotatable, a light emitting diode for projecting light onto the measured body, a number of light receiving elements each delivering an output pulse signal upon reception of the light reflected from the reflecting portions of the measured body, and a counter for counting the number of pulses of the output signal obtained from the light receiving element for providing an output corresponding to a rotating angle of the measured body. A monitoring light receiving element is further provided near the light emitting diode, and the light output of the light emitting diode is controlled based on the output signal obtained from the monitoring light receiving element.

REFERENCES:
patent: 3532434 (1970-10-01), Jones et al.
patent: 3775617 (1973-11-01), Dubauskas
patent: 4078173 (1978-03-01), Fultz
patent: 4254331 (1981-03-01), Dorman et al.

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