Apparatus for and methods of optical encoding having spiral shap

Details Apparatus for and methods of optical encoding having spiral shap Apparatus for and methods of optical encoding having spiral shap

1989-12-08

1991-05-21

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25023116, 250237G, G01D 534

Patent

active

050177761

ABSTRACT:
Disclosed are apparatus and methods for transducing mechanical movement into electrical signals indicative of the movement. The apparatus is an improved optical encoder of the type having a source of light, a code wheel for modulating the light according to movement of the object whose position is being measured and a photo detector for receiving the modulated light. The code wheel modulates the light from the light source into spiral-shaped beams of light separated by columns of spiral-shaped dark areas. Photo detectors are oriented to receive the modulated light.

REFERENCES:
patent: 3757128 (1973-09-01), Vermeulen
patent: 4253021 (1981-02-01), Ernst
patent: 4691101 (1987-09-01), Leonard

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