Optical rotational encoder

Details Optical rotational encoder Optical rotational encoder

1977-09-28

1979-05-01

Mullins, James B.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, G01D 534

Patent

active

041525892

ABSTRACT:
An optical encoder of the type having a fixed and rotating disc adjacent each other with superimposed varying light transmission patterns, such as slits, wherein one or more light beams are passed therethrough and the light pattern detected is an indication of the relative rotation between the fixed and rotary disc. A special optical element is located on one side of the fixed and rotary discs while the light source, detectors and electronics are located on another side of said discs. The optical element is a single solid optically clear piece of material with certain outside surface areas selectively positioned with respect to the light beams at angles for either total reflection or total transmission in a manner to provide a desired optical path.

REFERENCES:
patent: 3244895 (1966-04-01), Anderegg

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