Projection lens unit
US7612951B2 · kind B2 · utility
5Cited by
5References
24Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 23, 2007 |
| Grant date | Nov 3, 2009 |
| Priority date | — |
| Expiry date | Dec 24, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/22
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A projection lens system 1A enlarges and projects onto a screen 8, via a plurality of lenses G1 to G16, image light emitted from, a light source 4 and modulated by DMDs 3r to 3b. A movable lens barrel 25 holds the lens G16, having positive power, which is positioned closest to the DMDs 3r to 3b. An outer tube 24 holds the movable lens barrel 25 to enable movement in the optical axis direction. Through thermal deformation at the time of an increase in temperature, the bimetal member 27 moves the movable lens barrel 25 in the optical axis direction so as to recede from the image formation devices which are the DMDs 3r to 3b.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.