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:
Jan. 15, 2013
Filed:
Sep. 17, 2010
Yasushi Yoshida, Kitakyushu, JP;
Yuji Arinaga, Kitakyushu, JP;
Shirou Yoshidomi, Kitakyushu, JP;
Yosuke Yamaguchi, Kitakyushu, JP;
Jiro Muraoka, Kitakyushu, JP;
Yasushi Yoshida, Kitakyushu, JP;
Yuji Arinaga, Kitakyushu, JP;
Shirou Yoshidomi, Kitakyushu, JP;
Yosuke Yamaguchi, Kitakyushu, JP;
Jiro Muraoka, Kitakyushu, JP;
Kabushiki Kaisha Yaskawa Denki, Kitakyushu-Shi, JP;
Abstract
An encoder includes: a main scale having two or more band-shaped tracks in each of which an optical main grating is formed so that longitudinal direction of the main scale corresponds to a measurement axis direction; and an index scale opposed to the main scale so as to form a diffraction interference optical system in cooperation with the main grating, disposed so as to be movable relative to the main scale in the measurement axis direction, and in which two or more optical index gratings are formed. A plurality of slits included in the main grating in at least one track are formed so as to be inclined at a predetermined inclination angle from a direction perpendicular to the measurement axis direction so that pitch of the slits in the track becomes equal to the pitch of the slits in the at least one other track.