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. 04, 2014
Filed:
Jan. 10, 2012
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 a first lens Lthat has a biconvex shape near an optical axis and has positive refractive power, a second lens Lthat has a biconcave shape near the optical axis and has negative refractive power, a third lens Lthat has a shape of a meniscus lens directing a concave surface thereof to an object side near an optical axis and has positive refractive power, and a fourth lens Lthat has a biconcave shape near the optical axis and has negative refractive power, arranged in this order from the object side. When the whole lens system has a focal length f and the fourth lens Lhas a focal length f, the imaging lens of the invention satisfies the following expression:−0.7<4/<−0.1.