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:
Sep. 04, 2012
Filed:
Mar. 04, 2010
Yasushi Yoshida, Fukuoka, JP;
Yosuke Yamaguchi, Fukuoka, JP;
Koji Suzuki, Fukuoka, JP;
Kabushiki Kaisha Yaskawa Denki, Kitakyushu-Shi, JP;
Abstract
An optical encoder includes a rotation disc, an annular slit, a light source, an absolute-value-related detecting unit, and a signal processing device. The annular slit includes a first annular slit and a second annular slit which are decentered in a mutually different direction. The light source is configured to irradiate light on the annular slit. The absolute-value-related detecting unit is configured to detect transmitted light or reflected light irradiated from the light source and transmitted or reflected at the annular slit to output a detected signal. The absolute-value-related detecting unit includes a first detecting unit corresponding to the first annular slit and a second detecting unit corresponding to the second annular slit. The signal processing device is configured to detect an absolute rotational angle of the rotation disc based on the detected signal output from the absolute-value-related detecting unit.