Patent · US Active

Imaging lens

US8531784B2 · kind B2 · utility

8Cited by

0References

12Claims

0Family size

Assignee

Kantatsu Co., Ltd · JP

Inventor

Masaya Hashimoto · Itami, JP

Key dates

Filing date	Oct 21, 2011
Grant date	Sep 10, 2013
Priority date	—
Expiry date	Oct 28, 2031

Classification

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

Abstract

An imaging lens includes: an aperture stop; a biconvex first lens directing convex surfaces toward an object and an image; a second lens directing a convex surface toward the object near the optical axis and having negative refractive power; a biconvex third lens directing convex surfaces toward the object and the image near the optical axis; a fourth lens directing a concave surface toward the object near the optical axis and having positive refractive power; and a fifth lens directing a convex surface toward the object near the optical axis and having negative refractive power. The aperture stop and the first to fifth lenses are arranged in this order from the object side, and a conditional expression 1 being 0.50<f1/f<0.76 is satisfied, where f1 represents the focal length of the first lens and f represents the focal length of the entire imaging lens.

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