Projection lens with high resolution and reduced overall length
US7742243B2 · kind B2 · utility
3Cited by
3References
17Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 7, 2007 |
| Grant date | Jun 22, 2010 |
| Priority date | — |
| Expiry date | Mar 21, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B9/64
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An exemplary projection lens includes, in this order from the magnification side to the minification side thereof, a negative lens group of negative fraction power, and a positive lens group of positive fraction power. The projection lens satisfies the formulas of: −2.5<F1/F<−1.5; and 1.3<F2/F<1.5, where F1, F2, and F respectively represent the effective focal lengths of the negative lens group, the positive lens group, and the projection lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.