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:
Jul. 06, 2004
Filed:
Jan. 16, 2003
Applicant:
Inventors:
Yoshinori Ito, Nagano-ken, JP;
Kazuhiro Hane, Miyagi-ken, JP;
Assignee:
Harmonic Drive Systems, Inc., Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01D 5/34 ; G01B 1/114 ;
U.S. Cl.
CPC ...
G01D 5/34 ; G01B 1/114 ;
Abstract
In a projection encoder based on a triple-grating concept, a light-transmitting grating group for detecting A- and B-phase signals, a photodiode group for detecting A- and B-phase signals, and a photodiode group for detecting a home position are formed on a movable grating plate of a projection linear encoder ; and a reflecting grating group for detecting A- and B-phase signals, and a reflecting grating group for detecting the home position are formed on a reflecting grating plate