Optical system for projection type image display device
US5103302A · kind A · utility
20Cited by
7References
28Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 18, 1990 |
| Grant date | Apr 7, 1992 |
| Priority date | — |
| Expiry date | Jan 18, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/31
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A projection type image display device provided with three projecting lenses projecting light emitted by cathode-ray tubes of different colors, red, green and blue, on a screen while enlarging an image is disclosed, in which clapper plates are disposed preferably in front of the red and the blue image source and the clapper plates have different shapes so as to obtain an image without the fluctuation in the color on the whole surface of the screen, even in the case where the distance from the cathode-ray tubes to the screen is shortened in order to reduce the size of the display device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.