Image projector
US6467910B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 20, 2000 |
| Grant date | Oct 22, 2002 |
| Priority date | — |
| Expiry date | Oct 25, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/3114
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
White light L11 emitted from a white light source 11 is split into R, G, B effective light beams L12 and reflected in an opposite direction with respect to the white light source 11 by a reflection type color wheel 17. The beams strike a spatial light modulator where they are modulated to R, G, B optical images L13, and the images are projected to a screen by a projection lens 18. Consequently, the diameter of the color wheel can be made larger without increasing the overall height of the apparatus. Further, unwanted light L14 transmitted through the reflection type color wheel 17 is prevented from causing heating or is transformed to electricity by a solar battery etc.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.