Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1989-07-03
1990-08-14
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
25023114, 25023118, 356375, H01T 314, G01D 534, G01B 1114
Patent
active
049489682
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 beam 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: 3553469 (1971-01-01), Stutz et al.
patent: 3581306 (1971-05-01), Johnson, Jr.
patent: 3806913 (1974-04-01), Kerhoas et al.
patent: 3854823 (1974-12-01), Loxham
patent: 3950099 (1976-04-01), Malueg
patent: 4211489 (1980-07-01), Kleinknecht et al.
patent: 4253021 (1981-02-01), Ernst
patent: 4761660 (1988-08-01), Lee
Messinger Michael
Nelms David C.
Spectra Inc.
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