Lens system
US7443610B1 · kind B1 · utility
57Cited by
6References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 7, 2007 |
| Grant date | Oct 28, 2008 |
| Priority date | — |
| Expiry date | Dec 7, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/22
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A lens system comprises a first lens positive in power, a second lens positive in power, a third lens negative in power, a fourth lens positive in power, and a fifth lens negative in power. The lens system meets a criteria of 1.6<TT/f<1.8, 1.6<f/f2<1.8, and −0.6<f/f5<−0.4, wherein TT denotes a distance between an object-side surface of the first lens and an image plane of the lens system; f2 denoting an effective focal length of the second lens; f denoting an effective focal length of the entire lens system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.