Patent · US Active

Zoom lens

US7605986B2 · kind B2 · utility

2Cited by

3References

14Claims

0Family size

Assignee

FOXSEMICON INTEGRATED TECHNOLOGY, INC. · TW

Inventors

Chao-Yu Hung · Baoshan, TW
Jyh-Long Chern · Baoshan, TW

Key dates

Filing date	Dec 24, 2008
Grant date	Oct 20, 2009
Priority date	—
Expiry date	Dec 24, 2028

Classification

Technology area (CPC G)Physics
CPC primaryG02B13/009
WIPO fieldOptics
WIPO sectorInstruments

Abstract

An exemplary zoom lens comprises, in order from an object side of the zoom lens, a first lens module having a negative refractive power, a second lens module having a positive refractive power and a third lens module having a positive refractive power. When the zoom lens is adjusted from wide-angle to telephoto, the first lens module remain fixed in place, the second group is moved toward the object side thereof along an optical axis so as to perform the zooming, while the third group is moved along the optical axis so as to compensate for any fluctuation of in position of an image on the image plane caused by the movement of the second lens module.

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