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:
Jun. 14, 2005
Filed:
May. 12, 2004
Applicant:
Kenji Kojima, Kawasaki, JP;
Inventor:
Kenji Kojima, Kawasaki, JP;
Assignee:
Mitutoyo Corporation, Kawasaki, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01D005/34 ;
U.S. Cl.
CPC ...
Abstract
A photoelectric encoder includes an optical receipt chip on which the light acceptance surfaces of a plurality of photodiodes are disposed two-dimensionally. Four optical signals different in phase from one another (i.e., light signals with phase 'A,' phase 'B,' phase “AA,” and phase “BB”) are guided to fall onto the light acceptance surfaces. The shape of each light acceptance surface is a regular hexagon.