Position transducer having absolute position compensation

Details Position transducer having absolute position compensation Position transducer having absolute position compensation

1988-12-27

1990-11-13

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25023118, 341 3, G01D 534, H03M 122

Patent

active

049703870

ABSTRACT:
A scale (110) having apertures representing a binary code (113A-113E) and other apertures (115, 116, 111) generating two compensation signals and moire fringes in cooperation with a mask (105) having tilted apertures (112A) is scanned by a light beam (101A), and the light beam which has passed through the aperture is detected, and an approximate position of the scale is detected by means of the binary code, then a precise position is detected by a signal of the moire fringes which is compensated on the basis of a predetermined algorithm (Table 1) specified by the compensation signals.

REFERENCES:
patent: 4384204 (1983-05-01), Tamaki et al.
patent: 4412206 (1983-10-01), Schwefel
patent: 4439672 (1984-03-01), Salaman
patent: 4524347 (1985-06-01), Rogers
patent: 4572952 (1986-02-01), March
patent: 4621256 (1986-11-01), Rusk
patent: 4700062 (1987-10-01), Ernst
patent: 4712088 (1987-12-01), Ernst
patent: 4772872 (1988-09-01), Villani

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