Compact imaging lens assembly
US7839580B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 25, 2010 |
| Grant date | Nov 23, 2010 |
| Priority date | — |
| Expiry date | May 25, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B9/10
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
This invention provides a compact imaging lens assembly comprising, in order from an object side to an image side: a first lens element with negative refractive power having a convex object-side surface and a concave image-side surface; a second lens element with positive refractive power, at least one of the object-side and image-side surfaces thereof being aspheric; and an aperture stop disposed between the second lens element and an image plane; wherein there are two lens elements with refractive power in the compact imaging lens assembly; and wherein the compact imaging lens assembly satisfies the relations: 0.40<f/f2<1.20, |R3/R4|>1.5. Such an arrangement of optical elements can effectively improve the image quality of the system, reduce the total track length of the lens assembly while maintaining a sufficient back focal length, and achieve a wide field of view.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.