Directional diffusing screen with suppressed zero-order light
US4586780A · kind A · utility
48Cited by
7References
4Claims
0Family size
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Key dates
| Filing date | Jul 30, 1982 |
| Grant date | May 6, 1986 |
| Priority date | — |
| Expiry date | Jul 30, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03H2250/32
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Optical assembly (34) has a transmission holographic optical element (46) which refracts the incoming ray (38) at an angle through the angularly oriented fiber (56) in fiber optic faceplate (48). Holographic optical element (50) refracts the ray (66) to become ray (44) toward a viewing pupil. The zero-order light from holographic optical element (46) is absorbed as ray (68) in the fiber optic faceplate. The zero-order light represented by ray (76) is absorbed in the holographic optical element (50). Holographic optical element (50) preferably forms a diffused viewing pupil for inspection of the light by the user.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.