Lamp reflector
US5003447A · kind A · utility
5Cited by
6References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 15, 1990 |
| Grant date | Mar 26, 1991 |
| Priority date | — |
| Expiry date | Feb 15, 2010 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF21S41/336
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A lamp reflector comprises a dished body having a front opening and a rear aperture for a bulb having a filament. The dished body has an upper paraboloid reflective surface subtending an angle of about 165.degree. at the optical axis. The body also has a lower paraboloidal reflective surface whose optical axis is coincident with. The filament lies on axis. The filament lies in front of the focus of the upper reflective portion but behind the focus of the lower reflective portion. The reflective portions and define an upwardly inclined step portion and a horizontally disposed step portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.