Lamp
US6244732A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 16, 1999 |
| Grant date | Jun 12, 2001 |
| Priority date | — |
| Expiry date | Apr 16, 2019 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF21W2111/02
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
There is provided a lamp composed of a light source, a tilted ellipsoidal rotation surface reflector, and an annular cylindrical lens. The tilted ellipsoidal rotation surface reflector is formed of an ellipsoidal rotation surface emerging when an ellipsoid, having a first focal line located on the center axis of the light source and adjacent the light source and a second focal point located on an oblique line passing through the first focal point and tilted appropriately from the light-source center axis and assumed on a plane containing the light-source center axis and the oblique line, is rotated around the light-source center axis. The annular cylindrical lens is obtained by rotating, around the light-source center axis, the cross-sectional configuration of an aspheric lens having a focal point adjacent the second focal point of the ellipsoid and having an optical axis nearly parallel to the light-source center axis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.