Patent · US Active

Imaging lens

US8570670B2 · kind B2 · utility

5Cited by

0References

10Claims

0Family size

Assignees

OPTICAL LOGIC INC. · JP
Kantatsu Co., Ltd · JP

Inventors

Yoji Kubota · Nagano, JP
Kenichi Kubota · Tochigi, JP
Hitoshi Hirano · Nagano, JP
Ichiro Kurihara · Tochigi, JP
Yoshio Ise · Tochigi, JP
Sumio Fukuda · Tochigi, JP

Key dates

Filing date	Mar 1, 2012
Grant date	Oct 29, 2013
Priority date	—
Expiry date	Apr 25, 2032

Classification

Technology area (CPC G)Physics
CPC primaryG02B13/0045
WIPO fieldOptics
WIPO sectorInstruments

Abstract

An imaging lens includes a first lens having negative refractive power; a second lens having negative refractive power; a third lens; a fourth lens; and a fifth lens. The first lens has a positive curvature radius on an image plane side. The second lens has a sharp convex surface, and a positive curvature radius on the image plane side. The third lens has a positive curvature radius on the object side and a negative curvature radius on the image plane side. The fourth lens has a negative curvature radius on the object side and a positive curvature radius on the image plane side. The fifth lens has a positive curvature radius on the object side and a negative curvature radius on the image plane side, and an aspheric surface.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.