Patent · US Active

Optical lens system for taking image

US7813057B2 · kind B2 · utility

119Cited by

3References

20Claims

0Family size

Assignee

LARGAN PRECISION CO., LTD. · TW

Inventor

Ming-Ching Lin · Taichung, TW

Key dates

Filing date	Nov 27, 2008
Grant date	Oct 12, 2010
Priority date	—
Expiry date	Nov 27, 2028

Classification

Technology area (CPC G)Physics
CPC primaryG02B13/18
WIPO fieldOptics
WIPO sectorInstruments

Abstract

An optical lens system for taking image comprises: a first lens element with positive refractive power, an Abbe Number of the first lens element being V1, and it satisfying the relation: 50<V1<60; a second lens element with negative refractive power having a concave object-side surface and a convex image-side surface; a third lens element having a convex object-side surface and a concave image-side surface, at least one of the object-side and the image-side surfaces of the third lens element being aspheric; a fourth lens element having at least one aspheric surface; and an aperture stop being located in front of the second lens element.

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