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:
Aug. 13, 2013
Filed:
Aug. 09, 2011
Yoji Kubota, Nagano, JP;
Kenichi Kubota, Nagano, JP;
Hitoshi Hirano, Nagano, JP;
Ichiro Kurihara, Tochigi, JP;
Yoshio Ise, Tochigi, JP;
Sumio Fukuda, Tochigi, JP;
Yoji Kubota, Nagano, JP;
Kenichi Kubota, Nagano, JP;
Hitoshi Hirano, Nagano, JP;
Ichiro Kurihara, Tochigi, JP;
Yoshio Ise, Tochigi, JP;
Sumio Fukuda, Tochigi, JP;
Optical Logic Inc., Nagano, JP;
Kantatsu Co., Ltd., Tochigi, JP;
Abstract
An imaging lens includes an aperture stop ST, a first lens Lthat is shaped to form a meniscus lens that directs a convex surface to the object side near an optical axis and has positive refractive power, a second lens Lthat is shaped to form a meniscus lens that directs a convex surface to the object side near the optical axis and has negative refractive power, a third lens Lthat is shaped to form a meniscus lens that directs a concave surface to the object side near the optical axis and has positive refractive power, and a fourth lens Lthat is shaped to form a meniscus lens that directs a convex surface to the object side near the optical axis, arranged in this order from an object side to an image side. When the first lens Lhas a focal length f1 and the second lens Lhas a focal length f2, the imaging lens is configured such that a relationship 0.3<|f1/f2|<0.7 is satisfied.