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:
Oct. 25, 2016
Filed:
Jan. 09, 2014
Fujifilm Corporation, Tokyo, JP;
Katsuhisa Tsutsumi, Saitama-ken, JP;
Yoshiaki Ishii, Saitama-ken, JP;
FUJIFILM Corporation, Tokyo, JP;
Abstract
An imaging lens provided with a negative first lens group and a positive second lens group disposed in order from the object side. The first lens group is composed of a first group first lens which is a biconcave negative single lens, and the second lens group is composed of a positive second group first lens, an aperture stop, a positive second group second lens, and a negative second group third lens disposed in order from the object side. The second group second lens and second group third lens are cemented to form a cemented lens. The imaging lens is configured to satisfy conditional expressions (2): 0<fg2/f<1.3, (2b'): 0.5<fg2/f<1.25, and (6): 31<νd2 <70 at the same time, where fg2 is combined focal length of the second lens group, f is focal length of the entire lens system, and νd2 is Abbe number of the second group first lens.