Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1995-01-31
1996-03-12
Sikes, William L.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
25023116, 356374, H01J 314, G01D 534
Patent
active
054988705
ABSTRACT:
An apparatus for detecting information as for the rotation of a scale having a diffraction grating arranged thereon along a direction of detection of the rotation is constituted by a light source portion for irradiating a light beam onto a first point on the diffraction grating of said scale wherein said light source portion emitting two diffracted lights having a predetermined order from the first point by the irradiation of the light beam, a transparent substrate to be parallelly arranged in the vicinity of the surface of said scale and having a plurality of optical elements arranged thereon, said plurality of optical elements directing the two diffracted lights of the predetermined order to a second point other than said first point on the diffraction grating of said scale and a photo-detector for detecting an interference light beam of the diffracted lights generated out of said second point on which the two diffracted lights of the predetermined order are incident whereby the information on the rotation of said scale relative to the photo-detector is detected by the photo-detection by said photo-detector.
REFERENCES:
patent: 4792678 (1988-12-01), Spies
patent: 4967072 (1990-10-01), Nishimura
patent: 4975571 (1990-12-01), McMurtry
patent: 5001340 (1991-03-01), Schwefel et al.
Canon Kabushiki Kaisha
Nguyen Tiep H.
Sikes William L.
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