Illumination device and image projection apparatus comprising the device
US6254246A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 1, 1999 |
| Grant date | Jul 3, 2001 |
| Priority date | — |
| Expiry date | Oct 1, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S362/80
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An illumination device and an image display apparatus using the same. The illumination device comprising a light source, an illumination uniformizing device, and a polarization converter. The image display apparatus comprises an illumination device provided in the invention, a synthesizing means, and a projection means. The illumination uniformizing device has an incident plane for receiving a light emitted from the light source. Opposite the incident plane, a mirror is used as a side plane of the illumination uniformizing device to reflect the light coming from the incident plane. A bottom plane at a lower side and projection plane at an upper side of the incident plane are disposed between the incident plane and the side plane. A scattering pattern gradually condensed from the incident side toward the side plane is formed on the bottom plane, so that the light incident from the incident plane is made uniform.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.