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. 28, 2017
Filed:
Sep. 22, 2015
Mitsubishi Electric Corporation, Chiyoda-ku, JP;
Mitsubishi Electric Research Laboratories, Inc., Cambridge, MA (US);
Takuya Noguchi, Chiyoda-ku, JP;
Osamu Nasu, Chiyoda-ku, JP;
Hajime Nakajima, Chiyoda-ku, JP;
Haruhiko Takeyama, Chiyoda-ku, JP;
Toru Sasaki, Chiyoda-ku, JP;
Makito Seki, Chiyoda-ku, JP;
Yoshinao Tatei, Chiyoda-ku, JP;
Shigenori Takeda, Chiyoda-ku, JP;
Takeshi Musha, Chiyoda-ku, JP;
Jay E. Thornton, Cambridge, MA (US);
Amit Agrawal, Cambridge, MA (US);
MITSUBISHI ELECTRIC CORPORATION, Chiyoda-ku, JP;
Mitsubishi Electric Research Laboratories, Inc., Cambridge, MA (US);
Abstract
Provided is an absolute encoder capable of detecting the absolute angle at high resolution and with high precision. An image sensor receives light in an absolute value code pattern of a scale, an edge detecting unit detects from the received light signal an edge pixel position and an edge direction, and an edge position correcting unit corrects the edge pixel position based on the edge direction. A phase detecting unit detects from the corrected edge pixel position the phase shift amount of a shift from a reference pixel position of the image sensor, and a high precision detection unit uses a rough absolute position detected by a rough detection unit and the phase shift amount detected by the phase detecting unit to detect the absolute position with high precision.