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:
Jul. 08, 2014
Filed:
Dec. 06, 2013
Nikon Corporation, Tokyo, JP;
Toshinori Take, Yokohama, JP;
Nikon Corporation, Tokyo, JP;
Abstract
A lens system comprises, on a side closest to an object, a first lens component having a positive refractive power and a second lens component having a positive refractive power in order from the object; and on a side closest to an image, a cemented lens constructed by cementing together a positive lens and a negative lens in order from the object; wherein the lens system satisfies the following conditional expressions:(1+2)/2>1.49(ν1+ν2)/2>60where n1 and ν1 denote a refractive index and an Abbe number of the first lens component at d-line, respectively, and n2 and ν2 denote a refractive index and an Abbe number of the second lens component at d-line, respectively.