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. 09, 2018
Filed:
May. 12, 2016
Optical Logic Inc., Nagano, JP;
Kantatsu Co., Ltd., Tochigi, JP;
Yoji Kubota, Nagano, JP;
OPTICAL LOGIC INC., Nagano, JP;
KANTATSU CO., LTD., Tochigi, JP;
Abstract
An imaging lens includes an aperture stop, a positive first lens with a biconvex shape, a negative second lens; a negative third lens, a positive fourth lens, and a negative fifth lens arranged in this order from an object side. When the whole lens system has a focal length f, focal lengths and Abbe's numbers of the first and the second lenses are f1, νd1, f2, and νd2, focal lengths of the fourth and fifth lenses are f4 and f5, a composite focal length of the first lens Land the second lens Lis f12, and a distance from a surface of the first lens Lon the object side to a surface of the fifth lens Lon the image side is Σd, the imaging lens satisfies the following conditional expressions:0.7<f12/f<1.40.2<|f1/f2|<0.615<νd1−νd20.4<f4/f<1.0Σd/f<1.2|f5/f|<1.0