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:
Feb. 15, 2011
Filed:
Dec. 09, 2009
Katsuya Watanabe, Yokohama, JP;
Takayuki Morita, Fujisawa, JP;
Katsuya Watanabe, Yokohama, JP;
Takayuki Morita, Fujisawa, JP;
Nikon Corporation, Tokyo, JP;
Abstract
An immersion microscope objective lens of the present invention has: in order from an object, a first lens group Ghaving positive refractive power and having a cemented lens of a plano convex lens having a plane facing the object and a meniscus lens having a concave surface facing the object, and a single meniscus lens having a convex surface facing the object; a second lens group having positive refractive power and having a plurality of cemented lenses; and a third lens group having negative refractive power and having a cemented meniscus lens having a concave surface facing an image, and a cemented meniscus lens having a concave surface facing the object. And the following conditional expressions 0.12<df<0.25, 0.04<θCt(p)−θCt(n)<0.09 and −0.03<θhg(p)−θhg(n)<0.00 are satisfied.