Rear projection screen system
US4143943A · kind A · utility
69Cited by
3References
1Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 17, 1977 |
| Grant date | Mar 13, 1979 |
| Priority date | — |
| Expiry date | Feb 17, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/56
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A rear projection screen which eliminates speckle by only linear diffuser surface motion. One of a pair of closely spaced plates of the rear projection screen is maintained fixed while the other plate is driven such that it has a linear motion relative to the fixed plate. The plates are optically transparent and have their facing surfaces etched or coated to provide adjacent diffusing surfaces. The driven screen is supported by L-shaped spring metal straps thereby providing a strong plate support assembly which can operate at low noise levels and with low drive-power requirements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.