Polarizing conversion unit, illuminating device and projector using them
US5590942A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 8, 1993 |
| Grant date | Jan 7, 1997 |
| Priority date | — |
| Expiry date | Sep 8, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/3167
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A polarizing conversion unit is disclosed. The unit is provided with a polarizing beam splitter for separating light from a light source into first and second polarized lights differing in polarized state from each other, polarizing conversion means for varying the polarized state of the first polarized light and making it substantially coincident with the polarized state of the second polarized light, and reflecting means for reflecting the first or second polarized light, at least a portion of that surface of the outer peripheral portion of the polarizing conversion unit which is parallel to the optical path of the light functioning as a reflection surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.