The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 09, 1996
Filed:
Sep. 26, 1995
Hiroshi Kondo, Yokohama, JP;
Kou Ishizuka, Ohmiya, JP;
Satoshi Ishii, Tokyo, JP;
Yasushi Kaneda, Tokyo, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
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.