Patent · US Active

Imaging lens

US8416510B2 · kind B2 · utility

5Cited by

4References

7Claims

0Family size

Assignee

OPTICAL LOGIC INC. · JP

Inventors

Yoji Kubota · Nagano, JP
Kenichi Kubota · Tochigi, JP
Hitoshi Hirano · Nagano, JP

Key dates

Filing date	Nov 4, 2011
Grant date	Apr 9, 2013
Priority date	—
Expiry date	Dec 2, 2031

Classification

Technology area (CPC G)Physics
CPC primaryG02B13/004
WIPO fieldOptics
WIPO sectorInstruments

Abstract

An imaging lens includes a first lens group having a first lens that directs a concave surface to an image plane side and is negative; a second lens group having a second lens that directs a concave surface to an object side and is positive; an aperture; a third lens group having a third lens that is positive; and a fourth lens group having a joined lens that is composed of a fourth lens that is positive and a fifth lens that is negative. In the configuration, when the whole lens system has a focal length f and a composite focal length of the first lens group to the third lens group is Fa, the imaging lens satisfies the following relation:0.3<f/Fa<1.0.

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