Light source in the form of a sealed beam ARC lamp including three reflective surfaces
US5869920A · kind A · utility
3Cited by
3References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 27, 1996 |
| Grant date | Feb 9, 1999 |
| Priority date | — |
| Expiry date | Nov 27, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/98
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A light source suitable for use in a projection system is described. The light source is in a form of an arc lamp including an arc gap defined between an anode and a cathode. The arc gap is positioned at the focal point of a parabolic reflector which is truncated at its focal plane. A spherical reflector oppositely directed to the parabolic reflector and concentric with the focal point of the parabolic reflector is arranged so as to direct light from the arc which has not been intercepted by the parabolic reflector back into the arc gap.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.