Optical encoder with dual diffraction gratings

Details Optical encoder with dual diffraction gratings Optical encoder with dual diffraction gratings

1995-07-20

1997-08-26

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, 356356, G01B 902, H01J 312

Patent

active

056612958

ABSTRACT:
An optical encoder includes: a light source; a first grating plate having a first diffraction grating for diffracting a light beam emitted from the light source; a second grating plate having a second diffraction grating for further diffracting the light beam diffracted by the first diffraction grating; a reflector for reflecting the light beam from the second grating plate so as to allow the light beam to reenter the second grating plate; and a light-receiving portion for receiving the light beam reflected by the reflector and successively diffracted by the second and first grating plates, wherein a diffraction angle of plus and minus first-order diffracted light beams of the first diffraction grating is substantially equal to that of the plus and minus first-order diffracted light beams of the second diffraction grating, and the light-receiving portion generates an electric signal in accordance with the amount of the plus and minus first-order diffracted light beams of the first diffraction grating.

REFERENCES:
patent: 4188124 (1980-02-01), Jaerisch et al.
patent: 4200395 (1980-04-01), Smith et al.
patent: 4338012 (1982-07-01), Matsumura et al.
patent: 4656347 (1987-04-01), Une et al.
patent: 5196711 (1993-03-01), Matsugu et al.
patent: 5327218 (1994-07-01), Igaki

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