Catadioptrically coupled color television projection system
US4027328A · kind A · utility
Inventor
Key dates
| Filing date | Nov 28, 1975 |
| Grant date | May 31, 1977 |
| Priority date | — |
| Expiry date | Nov 28, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2005/7483
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A color television projection system that optically combines the outputs of three small cathode ray tubes, each projecting an image in one of three primary colors, to produce a full-color image that is not subject to the usual "color matrix" losses experienced by contemporary television receiver units. This system employs a solid optical system, similar to a classical Schmidt system, but modified by having the necessary colored beamsplitters immersed, as part of the fabrication process, within the solid optics near the primary focal plane to serve as the aperture stop for the system, and further modified by having an air separated corrector lens. Additional light energy efficiency, over contemporary techniques, is obtained by having the cathode ray tube faces immersed within the solid optics and optically coupled thereto by an appropriate optical bonding agent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.