Projection screen
US7777948B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 15, 2008 |
| Grant date | Aug 17, 2010 |
| Priority date | — |
| Expiry date | Feb 3, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/56
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A projection screen is disclosed, which includes an upper housing, an upper roller, a reflecting curtain, a lower housing, a lower roller, a lower mask and a positioning assembly. The upper roller is pivoted in the upper housing. The reflecting curtain is wound on the upper roller and has a reflecting surface to form a projection area. The lower housing is fixed at a free end of the reflecting curtain. The lower roller is pivoted in the lower housing. The lower mask is wound on the lower roller. The positioning assembly detachably connects a free end of the lower mask to the reflecting curtain, so that the lower mask covers a portion of the reflecting surface of the reflecting curtain to define the boundary of the projection area.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.