Code wheel for reflective optical rotary encoders

Details Code wheel for reflective optical rotary encoders Code wheel for reflective optical rotary encoders

1985-01-17

1987-02-17

LaRoche, Eugene R.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

29578, G01D 534

Patent

active

046441565

ABSTRACT:
A code wheel for use in a reflective optical rotary encoder includes a code wheel body formed of a light-reflective material, and a photosensitive layer directly coated on a flat surface of the code wheel body and exposed to light to produce angularly spaced non-reflecting surfaces, thereby providing alternate reflecting and non-reflecting surfaces on the code wheel body. The speed and direction of rotation of the code wheel can be detected by radiating light onto the reflecting and non-reflecting surfaces and detecting light reflected by the reflecting surfaces.

REFERENCES:
patent: 4286871 (1981-09-01), Erickson

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