Illumination device and projector
US7008070B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 26, 2004 |
| Grant date | Mar 7, 2006 |
| Priority date | — |
| Expiry date | Aug 6, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/285
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An illumination device includes: a light source; a polarization converter (114) that converts a light beam irradiated by the light source into a substantially uniform linear polarized light, the polarization converter (114) being slanted relative to a central axis of the light beam irradiated by the light source and including a plurality of polarization-separating films (1141) and a plurality of light reflection films (1143) alternately arranged in a direction substantially orthogonal to the central axis of the light beam irradiated by the light source; an optical filter (311) provided between the light source and the polarization converter (114) and having a plurality of optical conversion layers, which are formed striped with the pitch thereof corresponding to the arrangement of the polarization-separating films (1141) to optically convert the incident light beam; a holder frame (312) that holds the optical filter (311); and a filter-driving mechanism (313) that moves the holder frame (312) in a direction in which the polarization-separating films (1141) are arranged.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.