Motor vehicle headlight including a two-filament lamp for selectively generating a main beam and an anti-fog beam
US5544021A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 29, 1993 |
| Grant date | Aug 6, 1996 |
| Priority date | — |
| Expiry date | Jul 29, 2013 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF21S41/164
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A motor vehicle headlight of the type comprising a two-filament lamp in which a first filament is provided with a cup so as to allow light to pass over a given angular extent only, and in which a second filament has no such cup, the headlight further comprising a closure glass and a reflector suitable for co-operating with one or the other of the two filaments respectively for generating an anti-fog beam and a main beam. According to the invention, the reflector comprises a reflecting surface having a first zone whose extent corresponds at least approximately to said given angular extent and whose shape is such that it generates, on its own, images of the first filament in which all of the points of the images lie below a cutoff that extends generally horizontally, thereby forming the anti-fog beam, and a second zone that runs continuously into the first zone, said first and second zones co-operating with the second filament to form the main beam.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.