Optical lens system for taking image
US7564635B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 30, 2008 |
| Grant date | Jul 21, 2009 |
| Priority date | — |
| Expiry date | Aug 30, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/18
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical lens system for taking image consisting of: an aperture stop; a first lens element with positive refractive power having a convex object-side surface; a plastic second lens element with positive refractive power having a concave object-side surface and a convex image-side surface, at least one of the object-side and the image-side surfaces of the second lens element being aspheric; and a plastic third lens element with positive refractive power having a convex object-side surface, at least one of the object-side and the image-side surfaces of the third lens element being aspheric. A focal length of the optical lens system for taking image is f, a focal length of the second lens element is f2, a focal length of the third lens element is f3, and at least one of the relations of f/f2 and f/f3 is larger than 0.1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.