Rear projection screen
US4674836A · kind A · utility
55Cited by
6References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 7, 1986 |
| Grant date | Jun 23, 1987 |
| Priority date | — |
| Expiry date | Mar 7, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/625
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Provided is a rear projection screen onto which light from a projector is introduced at an angle from about 40 to 70 deg. with respect to the rear light incidence surface of the screen. A plurality of elongated prisms are formed on the rear surface of the screen, extending along curved lines, each prism having a reflection surface extending along the associated curved line, thereby the light received by the rear surface is internally reflected by the reflection surface, and transmitted through the light transmitting medium of the screen and is then emerged from the front viewing surface thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.