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:
Sep. 04, 2012
Filed:
Nov. 25, 2009
Applicants:
Tatsuya Nagahama, Kawasaki, JP;
Kenji Okabe, Kawasaki, JP;
Sadayuki Matsumiya, Kawasaki, JP;
Inventors:
Assignee:
Mitutoyo Corporation, Kawasaki-shi, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B 7/04 (2006.01); G06M 7/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
An autofocus device includes an objective lens, an observation optical system, a driving mechanism that displaces the objective lens in an optical axis direction thereof, an illumination-optical-system optical path used to illuminate a measurement surface of a measurement object through the objective lens with light, and a pattern-projection-optical-system optical path. An electronic control shutter, a pattern projection plate having a predetermined pattern formed thereon, and a projection lens are provided in the pattern-projection-optical-system optical path.