Lighting system
US4947292A · kind A · utility
Inventor
Key dates
| Filing date | Nov 8, 1988 |
| Grant date | Aug 7, 1990 |
| Priority date | — |
| Expiry date | Nov 8, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E10/40
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A lighting system having a light source is disposed inside the reflective inner surface of a reflector. The longitudinal profile of the reflector is a continuous curve comprised of four substantially circular arcs and a parabolic segment. A first arc lies nearest the source. A second arc having a radius of substantially 1/2 (1+.sqroot.5) times the radius of the first "continues" the first in the sense that the arcs have the same slope at their point of contact. Likewise, a third arc having a radius of substantially 1/2 (1+.sqroot.5) times the radius of the second continues the second arc and a fourth has a radius substantial 1/2 (1+.sqroot.5) times the radius of the third. The parabolic segment continues the fourth arc and completes the profile. Internal and external reflecting means may be provided to further align and direct the exiting light.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.