Optical lens system for taking image
US7957076B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 19, 2009 |
| Grant date | Jun 7, 2011 |
| Priority date | — |
| Expiry date | Nov 11, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/16
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical lens system for taking image comprises, in order from an object side to an image side: a first lens element with positive refractive power having an aspheric convex object-side surface and an aspheric concave image-side surface; a second lens element with positive refractive power having an aspheric convex object-side surface and an aspheric concave image-side surface. Radii of curvature of the object-side surface of the first lens element, the object-side and image-side surfaces of the second lens element are R1, R3 and R4 respectively, focal lengths of the optical lens system for taking image, the first and second lens elements are f, f1, f2 respectively, an on-axis distance between the first and second lens elements is T12, a center thickness of the second lens element is CT2, they satisfy the relations: 0.76 mm−1<1/R1<2.0 mm−1; 0.4<R3/R4<1.15; 0.35<(f/f1)−(f/f2)<0.72; T12/CT2>1.0.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.