Lamp with radially graded cermet feedthrough assembly
US6020685A · kind A · utility
15Cited by
11References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 27, 1997 |
| Grant date | Feb 1, 2000 |
| Priority date | — |
| Expiry date | Jun 27, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/827
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
This invention involves a new type of feedthrough-plug member for metal halide HID lamp using PCA envelopes. The construction of the lamp housing consists of a PCA envelope and specially designed radially graded alumina-metal cermet multi-layers to eliminate cracking in cermet or PCA due to thermal stresses arising from thermal expansion mismatch. The fills are metal halides such as Na-Sc-I, rare earth halides, Hg, Sn, and inert gases. The PCA vessel and directly sealed cermetfeedthrough assemblies allow the metal halide lamps to operate at high wall temperatures with better lumen output, color temperature, and CRI.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.