Head lamp device for an automobile
US6334701B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 30, 1998 |
| Grant date | Jan 1, 2002 |
| Priority date | — |
| Expiry date | Jul 30, 2018 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF21W2107/17
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A head lamp device includes a structure in which a discharge lamp has a discharge bulb and a reflector of a substantially hemispheric shape arranged in an upper part of a housing. A filament including a filament bulb and a reflector of a substantially hemispheric shape is arranged in a lower part of the housing. The front opening of the lamp housing is covered by a front lens. The discharge bulb can generate two to three times as much luminous flux as a conventional filament bulb. As a result, it is possible to reduce the size of the discharge bulb as compared to the filament bulb. This makes it possible to reduce the overall size of the head lamp device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.