Projection type image display apparatus
US7854515B2 · kind B2 · utility
2Cited by
10References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 30, 2006 |
| Grant date | Dec 21, 2010 |
| Priority date | — |
| Expiry date | Oct 12, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/7458
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An projection type image display apparatus includes a projection optical system having a plurality of concave mirrors and digital micromirror device (DMD). An optical path from the DMD to the concave mirror closest to the DMD is a sealed space which is surrounded by an image forming device holding plate holding the DMD, an optical component holding member holding the concave mirror and the image forming device holding plate, and a cover glass (transparent dust-proof cover) arranged on the optical path from the DMD to the concave mirror closest to the DMD.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.