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:
May. 30, 2017
Filed:
Oct. 05, 2015
Applicant:
Olympus Corporation, Shibuya-ku, Tokyo, JP;
Inventor:
Yo Furuya, Kamiina, JP;
Assignee:
OLYMPUS CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 21/00 (2006.01); G02B 21/02 (2006.01); G02B 9/14 (2006.01); G02B 21/36 (2006.01);
U.S. Cl.
CPC ...
G02B 21/02 (2013.01); G02B 9/14 (2013.01); G02B 21/361 (2013.01);
Abstract
A tube lens for a microscope includes, in the order from an object, a first lens group that has positive power and that includes a cemented lens, a second lens group that has negative power, and a third lens group has positive power. The tube lens satisfies the following condition expressions, where NA is a numerical aperture on an image side of the tube lens, FN is a field number of the tube lens, and ε is an airy disk diameter with respect to d line of the tube lens (588 nm):0.04<NA; and1700≦FN/ε.