Optical displacement detection apparatus employing diffraction g

Details Optical displacement detection apparatus employing diffraction g Optical displacement detection apparatus employing diffraction g

1995-09-26

1996-07-09

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25023116, H01J 314

Patent

active

055346936

ABSTRACT:
In an optical displacement sensor for measuring a moving state of a moving object by projecting a light beam onto a diffraction grating provided on a surface of a scale connected to the moving object and utilizing diffracted light beams of specific orders from among diffracted light beams diffracted by the diffraction grating, a portion of the light beams incident upon the diffraction grating is reflected at a reflecting region provided on the back of the scale a plurality of times. A photosensor detects a change in the amount of light emanating from a transparent or a light-blocking reference position, formed on a region on the surface of the scale other than the region where the diffraction grating is formed. An output signal from the photosensor is utilized as a reference signal, which provides information relating to the moving state of the moving object.

REFERENCES:
patent: 4602155 (1986-07-01), LaPlante
patent: 4654527 (1987-03-01), Schmitt
patent: 4766310 (1988-08-01), Michel
patent: 5026985 (1991-06-01), Ishizuka et al.
patent: 5057686 (1991-10-01), Hikawa et al.
patent: 5059791 (1991-10-01), Ishizuka et al.
patent: 5067813 (1991-11-01), Ishizuka et al.
patent: 5212380 (1993-05-01), Sato et al.
patent: 5260568 (1993-11-01), Ieki
patent: 5283434 (1994-02-01), Ishizuka et al.

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