Front projection screen
US4068922A · kind A · utility
16Cited by
7References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 1, 1976 |
| Grant date | Jan 17, 1978 |
| Priority date | — |
| Expiry date | Oct 1, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/60
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A cellulose acetate butyrate lacquer film containing minute beads of the clear lacquer is backed by a reflective surface, to form a high resolution front projection screen of selective gain. The gain of the screen depends upon the thickness of the lacquer film and the reflectivity of the backing member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.