Projector and lighting optical system therefor
US6109751A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 26, 1998 |
| Grant date | Aug 29, 2000 |
| Priority date | — |
| Expiry date | Jun 26, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/7441
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The structure of the present invention makes dark lines due to a central axis of a cross dichroic prism sufficiently inconspicuous. A stepped reflecting mirror is interposed between a second lens array and a condenser. The stepped reflecting mirror has the function of deviating the optical path of part of the partial light fluxes among a plurality of partial light fluxes passing through a plurality of small lenses aligned on the same column in lens arrays from the optical path of the other partial light fluxes. A planar transparent member may be used in place of the stepped reflecting mirror for the purpose of deviating the optical path. Another technique shifts part of rows in the lens arrays and to deviate the optical path of part of the partial light fluxes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.