Position encoder employing three or more colors

Details Position encoder employing three or more colors Position encoder employing three or more colors

1986-07-22

1988-09-27

Sloyan, I. J.

Coded data generation or conversion

Digital pattern reading type converter

With directional discrimination

250231SE, 341 11, 341 13, H03M 130

Patent

active

047744944

ABSTRACT:
An incremental position encoder comprising a first member arranged for movement with a second member the movement of which is to be monitored, a plurality of light transmissive or reflective elements of three distinct colors, said elements being arranged in a row on said first member, and the elements being arranged in the row in a repeating sequence of said three colors, a light source directing light to said elements and a color sensitive light detector for receiving light transmitted by, or reflected from said elements, said color sensitive detector being arranged to produce, at any given instant, one of three distinct outputs dependant upon the color of the three available, of the element which is at that instant transmitting or reflecting light from the source to the detector.

REFERENCES:
patent: 2656106 (1953-10-01), Stabler
patent: 3671722 (1972-06-01), Christie
patent: 3738504 (1973-06-01), Vail et al.
patent: 3836958 (1974-09-01), McMurtry
patent: 3967271 (1976-06-01), Day
patent: 4172554 (1979-10-01), Clarinval et al.
patent: 4228396 (1980-10-01), Palombo et al.

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