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. 02, 2013
Filed:
May. 23, 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;
Abstract
An imaging lens, although compact, has satisfactorily corrected aberrations. The imaging lens is configured by disposing, in sequence from the object side, a stop (ST); a first lens (L), which has a double convex shape near the optical axis; a meniscus-shaped negative second lens (L) which has near the optical axis a convex surface facing the object side; a meniscus-shaped positive third lens (L) which has near the optical axis a concave surface facing the object side; and a positive fourth lens (L) which has a double convex shape near the optical axis. In the configuration, the refractive power of the first lens (L) is greater than the refractive power of each of the second lens (L), the third lens (L), and the fourth lens (L).