Patent · US Active

Imaging lens and imaging apparatus

US7911712B2 · kind B2 · utility

13Cited by

3References

16Claims

0Family size

Assignee

Fujinon Corporation · JP

Inventors

Yu Kitahara · Saitama, JP
Yoko Yamamoto · Osaka, JP
Taro Asami · Saitama, JP

Key dates

Filing date	Oct 28, 2009
Grant date	Mar 22, 2011
Priority date	—
Expiry date	Oct 28, 2029

Classification

Technology area (CPC G)Physics
CPC primaryG02B9/60
WIPO fieldOptics
WIPO sectorInstruments

Abstract

An imaging lens includes, in order from an object side, a first lens having a negative power and including a concave image-side surface, a second lens having a positive power, a stop, a third negative lens, which is a biconcave lens, a fourth lens having a positive power, and a fifth lens having a positive power and including a convex image-side surface. The imaging lens satisfies the following conditional expressions:0.18<(D4+D5)/f<0.44, and0.18<D1/f where f denotes a focal length of an entire lens system, D1 denotes a thickness of a center of the first lens, D4 denotes a distance from an image-side surface of the second lens to the stop on an optical axis, and D5 denotes a distance from the stop to an object-side surface of the third lens on the optical axis.

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