Projector
US6155685A · kind A · utility
5Cited by
2References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 28, 1997 |
| Grant date | Dec 5, 2000 |
| Priority date | — |
| Expiry date | Oct 28, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/3105
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical device includes four prisms joined into one body to combine light beams, a first type of multilayer coating being provided between joining surfaces of the four prisms, and a second type of multilayer coating being provided on at least one non-joining surface of the four right-angle prisms. Each prism bears the first type of multilayer coating and the second type of multilayer coating on two or less surfaces thereof. The optical device is further provided with liquid crystal image panels to combine optical images and project a combined optical image to a screen.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.