Video projector
US6491398B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 28, 1999 |
| Grant date | Dec 10, 2002 |
| Priority date | — |
| Expiry date | Dec 28, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/7458
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A video projector using a reflection type optical modulation element whose lens system is simple in configuration and which can produce a high-brightness, high-contract projected image. A video projector has an optical source for radiating light; a reflecting mirror for reflecting the light radiated by the optical source as a reflected light beam goes along a particular optical axis; a converting optical system for converting a profile of the reflected light beam from the reflecting mirror; a plurality of color prisms for wavelength-separating the convertedlight from the converting optical system into a plurality of colored light beams; a plurality of reflection type optical modulation elements for selectively reflecting each of the colored light beams from the color prisms on a pixel—pixel basis in accordance with each of received video signals, respectively; a projecting lens for projecting light obtained through wavelength-combining, by the color prisms, of light beams reflected by each of the reflection type optical modulation elements; and a plurality of condenser lenses disposed between the color prisms and the reflection type optical modulation elements, respectively.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.