Illuminating device and projector utilizing the same
US5692819A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 2, 1995 |
| Grant date | Dec 2, 1997 |
| Priority date | — |
| Expiry date | Mar 2, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/74
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A projector comprising a light source having first and second high-luminance light emitting areas, an illuminating optical system for directing the light, from said light source, toward an object to be illuminated, wherein said first and second high-luminance light-emitting areas are positioned on the optical axis of said illuminating optical system, and a projection optical system for projecting the light emerging from said illuminated object, wherein said illuminating optical system is constructed in such a manner that a central area of said illuminated object is illuminated by most of the light beam from said first high-luminance light-emitting area, and a peripheral area of said illuminated object is illuminated by the remainder of the light beam from said first high-luminance light emitting area and most of the light from said second high-luminance light-emitting area.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.