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:
Nov. 08, 2011
Filed:
Jun. 26, 2007
Applicant:
Hiroaki Kawada, Kanagawa, JP;
Inventor:
Hiroaki Kawada, Kanagawa, JP;
Assignee:
Mitutoyo Corporation, Kanagawa, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B 7/02 (2006.01);
U.S. Cl.
CPC ...
Abstract
The present invention provides: a lens optical system having: a plastic lens; and a lens restraining member for mechanically restraining a thermal expansion of the plastic lens to control a variation of a curvature of lens due to a temperature change so as to suppress a variation of a focal position due to a temperature change; and a photoelectric encoder including the lens optical system.