High resolution optical encoder having a long detection stroke

Details High resolution optical encoder having a long detection stroke High resolution optical encoder having a long detection stroke

1988-09-29

1990-08-21

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25023118, H01J 314, G01D 534

Patent

active

049508911

ABSTRACT:
In order to detect positions, an optical encoder utilizes the phenomenon that the ratio in intensities of diffracted light beams of different orders change depending on the patterns of aperture ratios in one pitch of a grating on the scale, and that the distance between the positive and the negative diffracted light beams of the same order vary depending on the patterns of the grating pitch on the scale, or that the light spots of the positive and the negative diffracted light beams of the same order move (rotate) depending on the patterns of the grating line direction. Therefore, this optical encoder is free from the adverse influence of fluctuations in the amount of coherent light illuminated from the light source to thereby enable precise positional detection.

REFERENCES:
patent: 2886718 (1959-05-01), Shepherd et al.
patent: 3166624 (1965-01-01), Vargady
patent: 3983390 (1976-09-01), Llop
patent: 3985448 (1976-10-01), Wiklund et al.
patent: 4074258 (1978-02-01), Dore et al.
patent: 4528448 (1985-07-01), Doggett
patent: 4667099 (1987-05-01), Arai et al.
patent: 4720699 (1988-01-01), Smith
patent: 4778273 (1988-10-01), Michel
patent: 4819051 (1989-04-01), Jacobson
patent: 4823001 (1989-04-01), Kobayashi et al.

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