Projecting lens system
US7626764B2 · kind B2 · utility
2Cited by
3References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 18, 2007 |
| Grant date | Dec 1, 2009 |
| Priority date | — |
| Expiry date | Dec 18, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/0055
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A projecting lens system includes a first lens positive in power, a second lens negative in power, a third lens positive in power, and a fourth lens positive in power. The projecting lens system meets a criteria of 1.4<TT/f<1.7; where TT denotes a total length of the projecting lens system and f denotes an effective focal length of the projecting lens system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.