Optical system for taking image
US7397612B2 · kind B2 · utility
5Cited by
2References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 22, 2006 |
| Grant date | Jul 8, 2008 |
| Priority date | — |
| Expiry date | Nov 22, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/0035
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical system for taking image comprises three lens elements with refractive power, from the object side to the image side: a first lens element with negative refractive power, a second lens element with positive refractive power, and a third lens element with positive refractive power, wherein an aperture stop is located behind the first lens element, each of at least two lens elements is provided with at least one aspheric surface. By such arrangements, the optical system can obtain a good image quality, maintain enough back focal length and increase the field of view of the optical system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.