Rear projection screen
US4708435A · kind A · utility
36Cited by
14References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 30, 1986 |
| Grant date | Nov 24, 1987 |
| Priority date | — |
| Expiry date | Oct 30, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/625
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A rear projection screen is provided for observing an image by introducing light from the rear side of the screen at a sharp angle. The screen has a plane of incidence which comprises a plurality of prisms extending in lines or arcs. Each prism has a total reflection surface which totally reflects incident light so that the light emerges toward an observer and a surface opposite to the total reflection surface, and toward the total reflection surface and/or the opposite surface having a curved surface so that the luminous flux of the totally reflected light is once converged and is then diffused.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.