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. 18, 2014
Filed:
Feb. 08, 2012
Yasushi Yoshida, Kitakyushu, JP;
Shirou Yoshidomi, Kitakyushu, JP;
Yasuhiro Matsutani, Kitakyushu, JP;
Jiro Muraoka, Kitakyushu, JP;
Yasushi Yoshida, Kitakyushu, JP;
Shirou Yoshidomi, Kitakyushu, JP;
Yasuhiro Matsutani, Kitakyushu, JP;
Jiro Muraoka, Kitakyushu, JP;
Kabushiki Kaisha Yaskawa Denki, Kitakyushu-Shi, JP;
Abstract
An encoder includes a slit array along a first measurement axis, and an optical module capable of relatively moving with respect to the slit array. The optical module comprises a point light source that irradiates the part of the slit array, and a light receiving array comprising a plurality of light receiving elements along a second measurement axis and arranged in positions offset with respect to the point light source. The light receiving elements is receiving light irradiated from the point light source and reflected from the reflection slit. The plurality of light receiving elements comprises respective shapes such that the light receiving element nearer to the point light source comprises a shorter length in a width direction and end parts on an opposite side of the light receiving element with respect to the point light source are arranged side by side in positions along the second measurement axis.