Vehicle headlamp
US4985816A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 27, 1989 |
| Grant date | Jan 15, 1991 |
| Priority date | — |
| Expiry date | Mar 27, 2009 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF21W2102/16
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Disclosed herein is a vehicle headlamp which comprises an ellipsoidal light reflector having first and second focuses; a light source positioned at the first focus, so that light rays produced by the light source are reflected forward by the light reflector and converged at the second focus; a converging lens positioned in front of the second focus; a shading device positioned near the second focus for partially shading the light rays which have been reflected by the light reflector; and control means for controlling the shading characteristic of the shading device in accordance with an operation mode of the vehicle, wherein said shading device comprises a liquid crystal matrix which has a plurality of small light transmitting elements independently and electrically controlled by said control means.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.