Lens system
US8427764B1 · kind B1 · utility
Assignees
Inventors
Key dates
| Filing date | Oct 27, 2011 |
| Grant date | Apr 23, 2013 |
| Priority date | — |
| Expiry date | Oct 27, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/04
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A lens system with positive refraction power, in order from the object-side to the image-side, includes a first lens group with negative refraction power and a second lens group with positive refraction power. The first lens group includes a first lens with negative refraction power, a second lens with positive refraction power, and a third lens with positive refraction power. The second lens group includes a fourth lens with negative refraction power, a fifth lens, and a sixth lens. The lens system satisfies the following condition: 5<D/F<5.3, wherein: D is a total length of the lens system; F is a focal length of the lens system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.