Headlamp for an automobile
US4562519A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 31, 1984 |
| Grant date | Dec 31, 1985 |
| Priority date | — |
| Expiry date | Jul 31, 2004 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF21S41/275
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A headlamp for an automobile, capable of emitting a beam of light with a cut-off comprising an elliptical reflector having two focii, a light source at the first focus of the reflector, and a convergent lens located opposite the reflector with respect to the second focus. The lens and the reflector have a common optical axis and the focus of the lens is at the second focus of the reflector. A screen is located at the common focus having an edge close to the optical axis in order to define the cut-off beam. Localized deflector elements are provided at the upper part and the lower part of the lens to produce a lateral dispersion and/or a lowering of the light passing through these parts of the lens in order to reduce the effects of the chromatic aberrations in the vicinity of the cut-off.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.