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:
Dec. 24, 2019
Filed:
Dec. 18, 2017
Applicant:
Seiko Epson Corporation, Tokyo, JP;
Inventor:
Hiroshi Wada, Azumino, JP;
Assignee:
Seiko Epson Corporation, , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B62D 5/04 (2006.01); G01D 5/34 (2006.01); G01D 5/347 (2006.01); G01L 3/08 (2006.01); G01L 3/12 (2006.01); B41J 19/20 (2006.01);
U.S. Cl.
CPC ...
B62D 5/0481 (2013.01); G01D 5/345 (2013.01); B41J 19/207 (2013.01); G01D 5/3473 (2013.01); G01D 5/34715 (2013.01); G01L 3/08 (2013.01); G01L 3/12 (2013.01);
Abstract
An encoder includes an optical scale that has a phase difference plate, a light source section that irradiates the phase difference plate with light, and a light receiving section that receives the light from the phase difference plate, and outputs a signal corresponding to a received light intensity. The light emitted from the light source section is linearly polarized, and the light receiving section outputs a signal corresponding to a polarization state of the light from the phase difference plate.