Optical encoder

Details Optical encoder Optical encoder

1990-07-13

1991-11-26

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25023116, 356374, H01J 314, H01J 516, H01J 4014

Patent

active

050685309

ABSTRACT:
An optical encoder of the present invention includes a first diffraction grating and a second diffraction grating which is displaceable relative to the first diffraction grating to detect the relative displacement. The second diffraction grating has a grating pattern which removes a component having a period which is a factor of 1
(n: a positive odd number) of the period of a displacement signal representing the relative displacement. In the optical encoder according to the present invention, higher harmonic components are cancelled by adding the amounts of light which passes through the grating portions whose phase differs by a predetermined distance. Consequently, a non-distorted displacement signal can be obtained.

REFERENCES:
patent: 3983390 (1976-09-01), Liop
patent: 4943716 (1990-07-01), Ichikawa et al.
patent: 4979827 (1990-12-01), Matsui
patent: 4985623 (1991-01-01), Ichikawa et al.

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