Focusing and projection screen
US4121234A · kind A · utility
3Cited by
12References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 5, 1977 |
| Grant date | Oct 17, 1978 |
| Priority date | — |
| Expiry date | Apr 5, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B13/24
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optica image forming screen which comprises a multiplicity of light-transmitting elements in a matrix of light-absorbing elements so that light incident upon the elements at an angle greater than a predetermined angle will be internally absorbed by the elements, with no significant reflection internal to the elements and with element size conducive to a scattering effect by using diffraction in the image space.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.