Xenon-metal halide lamp particularly suited for automotive applications having an improved electrode structure
US4968916A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 8, 1989 |
| Grant date | Nov 6, 1990 |
| Priority date | — |
| Expiry date | Sep 8, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/0732
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A xenon metal halide lamp having an improved electrode structure that is particularly suited for automotive applications is disclosed. The electrode is comprises of a tip portion that is located at one end of a shank with the shank having a filament coiled therearound. The tip and shank portions are designed to allow for high initial current during starting and low current during operation. The coil filament is situated in opposite neck portions of an envelope forming the light source so as to; (1) cause the electrodes to be axially aligned within the light source; (2) keep the shank of the electrode from intimate contact with the envelope thereby preventing the condensation of the mercury and allowing for substantial vaporization of the metal halide ingredients at the neck portion; and (3) prevent the thermal expansion of the electrode from cracking the envelope.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.