Internal lamp reflector
US4924134A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 15, 1988 |
| Grant date | May 8, 1990 |
| Priority date | — |
| Expiry date | Aug 15, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01K1/26
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An improved projector lamp with an internal reflector may be made by forming the reflector from pure aluminum, or an aluminum alloy not including amounts of vaporizable materials. Anodized aluminum is not used. A pure aluminum reflector is mechanically polished and chemically etched to attain a high level of reflectivity. The quality of the surface finish is retained by enclosing the reflector in an oxygen free lamp. The high purity aluminum acts as a getter for oxygen, and other detrimental contaminants, thereby tending to extend the lamp life and maintain lamp output. Since aluminum is lighter weight than the previous reflector materials, the lamps do not suffer as much breakage during manufacture and shipping.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.