Projection lens system with high resolution and compact size
US8248714B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Dec 11, 2010 |
| Grant date | Aug 21, 2012 |
| Priority date | — |
| Expiry date | Feb 16, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/18
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present disclosure relates to a projection lens system for a projector having a spatial light modulator (SLM). The projection lens system includes, in order from the magnified end to the minified end thereof, a first lens group with negative refraction power, a second lens group with positive refraction power, and a third lens group with positive refraction power. The projection lens system satisfies the following formulas: 3<TT/f<3.6, and 0.48<BFL/f; wherein, TT is the overall length of the projection lens system; f is an effective focal length of the projection lens system; BFL is the back focal length of the projection lens system, the back focal length is equal to the distance between the third lens group and the SLM.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.