Holographic device for formation of light beams with predetermined spectral compositions and projector of video images containing such a device
US6323896A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 1, 1999 |
| Grant date | Nov 27, 2001 |
| Priority date | — |
| Expiry date | Oct 1, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/32
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The device includes a) flat mirror (7) formed by adjacent areas (5.sub.i, 6.sub.i) that are alternately transparent and reflecting with parallel and straight lines of demarcation, b) identical first (4) and second (4') reflection holograms, each delivering at least one diffracted beam with a predetermined spectral composition, c) illuminating source (1) for illuminating said holograms (4, 4') at normal incidence by the intermediary of said mirror (7), said holograms (4, 4') being arranged symmetrically with respect to the plane of said mirror (7) in such a way as to be illuminated by the intermediary of transparent (6.sub.i) and reflecting (5.sub.i) strips, respectively, of mirror (7), and in such a way that the beams diffracted by the first and second holograms are reflected and transmitted, respectively, by reflecting (5.sub.i) and transparent (6.sub.i) strips, respectively, of mirror (7), in order to be combined into a continuous light beam with said spectral composition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.