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:
Jan. 27, 2015
Filed:
Feb. 06, 2013
Optical Logic Inc., Ina-shi, Nagano, JP;
Kantatsu Co., Ltd., Yaita-shi, Tochigi, JP;
Yoji Kubota, Ina, JP;
Kenichi Kubota, Ina, JP;
Hitoshi Hirano, Ina, JP;
Ichiro Kurihara, Yaita, JP;
Yukio Sekine, Yaita, JP;
Optical Logic Inc., Nagano, JP;
Kantatsu Co., Ltd., Tochigi, JP;
Abstract
An imaging lens includes a first lens; a second lens; and a third lens arranged from an object side to an image plane side. The first lens has an object-side surface with a positive curvature radius. The second lens has an object-side surface and an image plane-side surface with negative curvature radii. The third lens has an object-side surface and an image plane-side surface with positive curvature radii. The object-side surface and the image plane-side surface of the third lens are respectively formed as an aspheric shape having an inflexion point. When the whole lens system has a focal length f, the first lens has a focal length f, the second lens has a focal length f, and the third lens has a focal length f, the imaging lens satisfies the following conditional expressions:1<21.0<1/1.50.7<2/3<1.2.