Projection image display device
US8388144B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 9, 2011 |
| Grant date | Mar 5, 2013 |
| Priority date | — |
| Expiry date | Nov 2, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/16
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention provides a projection image display device capable of both minimizing a decrease in a cooling ability and simplifying maintenance of a filter. The projection image display device according to the present invention includes a filter material for filtering external air taken into a casing, a loop-shaped filter frame onto which the filter material is mounted, a drive mechanism for rotating the filter frame in a loop direction of the loop shape, and a dust removal brush to be brought into contact with the filter material while spinning at a predetermined position. The filter material is mounted onto a part of a loop-shaped surface of the filter frame. The filter material is not mounted but a ventilation part is provided in the other part of the loop-shaped surface of the filter frame.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.