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:
Mar. 05, 2013
Filed:
Mar. 06, 2009
Yoshihiro Shoji, Nagano, JP;
Yoshi Ishizuka, Nagano, JP;
Shoji Ito, Nagano, JP;
Sanyo Denki Co., Ltd., Tokyo, JP;
Abstract
An optical encoder device is provided, in which the number of light transmissive slits of a stationary slit plate can be increased as much as possible according to the length of a light receiving surface of a light receiving element to produce an output signal with little distortion. A movable slit plateincludes a slit row Rin which a plurality of light transmissive slits (light transmissive portions) Seach having a slit width of 180° in terms of electrical angle and a plurality of light non-transmissive slits (light non-transmissive portions) Seach having a slit width of 180° in terms of electrical angle are alternately formed. A stationary slit plateincludes a slit row Rin which a plurality of light transmissive slits Seach having a slit width of 180° in terms of electrical angle and a plurality of light non-transmissive slits Seach having a slit width of (360Xk-180)° in terms of electrical angle are alternately formed. k is a value that satisfies k=1±(⅓) where n denotes the number of the light transmissive slits S