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:
Jan. 19, 2010
Filed:
Sep. 11, 2007
Jun Hane, Tokyo, JP;
Eiji Yamamoto, Oume, JP;
Yoshimi Kuroda, Funabashi, JP;
Iwao Komazaki, Saitama, JP;
Jun Hane, Tokyo, JP;
Eiji Yamamoto, Oume, JP;
Yoshimi Kuroda, Funabashi, JP;
Iwao Komazaki, Saitama, JP;
Olympus Corporation, Tokyo, JP;
Abstract
In a triple slit optical encoder, a first grating and a third grating are formed on separate members, and values of a first effective width Wand a first pitch pof an optical pattern on the first grating, and a third effective width Wand a third pitch pof an optical pattern on the third grating are set to values such that a periodic signal having the amplitude effective for detection of a relative displacement of a scale is achieved based on periodicity of the self-image, refractive indices of substances of substances and/or spaces interposed in the optical path from a bare LED up to a photodetector, and the thickness of those substances and/or spaces in a direction substantially perpendicular to a plane on which the second grating is formed.