Lamp with stepped reflector surface containing vertical ribs
US4351018A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 24, 1980 |
| Grant date | Sep 21, 1982 |
| Priority date | — |
| Expiry date | Jun 24, 2000 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF21S41/336
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In a motor vehicle headlamp or the like, the required distribution of the light rays is achieved entirely by selecting an appropriate configuration for the reflector; the front glass is a plain glass having smooth front and rear surfaces. The reflector surface is, as far as possible, a plain paraboloidal surface, but is provided with elongate ribs in selected zones, to produce a spreading of the light rays reflected from these ribs; the light is spread transversely to the length of the ribs. The reflector surface also has offset portions which, like the basic reflector shape, are paraboloidal, but have their focus or foci displaced from the focus of the basic reflector shape.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.