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:
Jan. 16, 2018
Filed:
Jan. 09, 2015
Nikon Corporation, Minato-ku, Tokyo, JP;
Miho Matsumoto, Tokyo, JP;
Kotaro Yamaguchi, Kamakura, JP;
Nikon Corporation, Tokyo, JP;
Abstract
An objective lens (OL) according to the present invention comprises, in order from an object side, a first lens group (G) having positive refractive power, and a second lens group (G) having negative refractive power. The first lens group (G) comprises a positive meniscus lens (L) having a concave surface facing the object side, a positive lens (L) dispose close to an image of the positive meniscus lens (L), and a diffractive optical element (DOE) having a diffractive optical surface (D). The second lens group (G) is composed of three cemented lenses (CLto CL) which are configured with a positive lens and a negative lens cemented each other. When d00 denotes a distance from the object side to the positive meniscus lens (L), and TL0 denotes a distance from the object side to the objective lens rear end surface, 0.11≦d00/TL0≦0.19 is satisfied.