Image projector with polarization conversion system
US6053615A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 1, 1997 |
| Grant date | Apr 25, 2000 |
| Priority date | — |
| Expiry date | Aug 1, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/283
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An image projector has an optical path including, from upstream to downstream, a light source, a light pipe, a polarization conversion prism, a positive lens group and a light valve. The light pipe has an outlet and an inlet, and is constructed to receive light from the light source and to produce a unique projection display format as light is transmitted therethrough. The polarization conversion prism recycles light to optimize the amount of light that is properly polarized in the system. The positive lens group includes at least one positive lens positioned downstream of the polarization conversion prism. The positive lens group images the outlet of the light pipe onto the light valve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.