Projection type image display apparatus
US7850309B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 29, 2007 |
| Grant date | Dec 14, 2010 |
| Priority date | — |
| Expiry date | May 7, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/2026
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Elements of an optical system (12) of a projection type image display apparatus are stored in an optical system storage (46) having an upper opening in such a way that the optical element to be arranged close to a light source is fitted in the frame provided in the high-temperature region of the optical system storage (46) close to the light source, while the rest of the optical elements are respectively fitted in the frames in the low-temperature region of the optical system storage (46) remote from the light source. The upper opening in the high-temperature region is covered, in the low-temperature region, with a resilient metal lid (471), and, in the low-temperature region, covered with a resilient resin lid (472). Portions of these lids are partially cut into spring-like narrow strips having tips configured to firmly and accurately hold the lenses fitted in the respective frames, whereby the dimensional tolerances of the optical elements and the frames can be absorbed solely by the lids without resorting to any other parts.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.