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:
Apr. 16, 2002
Filed:
Nov. 09, 2000
Mitutoyo Corporation, Kawasaki, JP;
Abstract
A bright and dark field switching device, according to the present invention, comprises a glare-proof filter and a condenser lens for a dark field, a guide mechanism , and a switching mechanism . The glare-proof filter and the condenser lens for a dark field are arranged on both sides with an optical path L of an illuminating optical system interposed therebetween. The guide mechanism holds the glare-proof filter and the condenser lens for a dark field such that they can be moved to the optical path L and can be returned from the optical path L. The switching mechanism moves the glare-proof filter and the condenser lens for a dark field to the optical path L and returns them from the optical path L. Further, the switching mechanism moves the glare-proof filter together so as to position the same on the optical path L only when returning the condenser lens for a dark field from the optical path L.