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:
Nov. 05, 2019
Filed:
Apr. 23, 2015
Nikon Corporation, Chiyoda-ku, Tokyo, JP;
Hiroyuki Ishigami, Yokohami, JP;
Kunihiko Shimizu, Tokorozawa, JP;
Akihiko Obama, Tokyo, JP;
Takuji Hamasaki, Tokyo, JP;
Nikon Corporation, Tokyo, JP;
Abstract
An optical system comprises a first lens group Gdisposed in a most object side and having positive refractive power, a stop member ST disposed at an image side of the first lens group G, and a second lens group Gdisposed at an image side of the stop member ST. A predetermined conditional expression is satisfied, whereby light beyond the maximum angle of view collected on the focal point position of a most object side lens group having positive refractive power is reduced, so that heat generated by a member in the vicinity of the focal point position is reduced.