Color-separating optical system
US4268119A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 22, 1979 |
| Grant date | May 19, 1981 |
| Priority date | — |
| Expiry date | Jan 22, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S359/90
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A color-separating prism arrangement for a small portable video camera having solid-state detectors about 0.35 inch in height includes three prisms with the first and second prisms being separated by an air gap, and color separation occurring at respective spectrally selective dichroic plates between the first and second prisms and the second and third prisms, respectively, the separated color components being directed in different directions. The specific geometry of the system provides a prism assembly which is extremely small and compact, having an overall length of about 1.1 inches and an entrance face height of about 1 inch, and with each of the exit faces of the assembly having an effective height of about 1/2 inch. Each detector is accurately held in position with respect to the associated prism by disposing therebetween and in contact therewith a resilient gasket of foamed material, adjusting the position of the detector, then impregnating the foamed gasket with epoxy resin which sets rigidly to hold the detector in position with respect to the prism.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.