Lamp with light-source capsule support members having equal thermal conductivity
US4758759A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 6, 1986 |
| Grant date | Jul 19, 1988 |
| Priority date | — |
| Expiry date | Nov 6, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/52
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A single-ended lamp having a double-ended light-source capsule mounted axially within an outer envelope on thermally conductive support members such that the amount of heat conducted to the base region of the lamp through each support member is approximately equal. In a preferred embodiment, a high-pressure sodium lamp having a temperature-sensitive component in the lamp base employs two support wires for the arc tube; the support wire coupled with the arc tube end closer to the lamp base has a loop formed therein so that the lengths of both support wires are approximately equal and the thermal conductivity of both support wires are also approximately equal in the operating environment of the lamp; whereby the temperature-sensitive component operates within acceptable temperature limits. In alternate embodiments, each support member may employ one or more loops or other configurations in order to minimize the amount of heat transferred to the lamp base through conduction in the support members. The invention has particular application in lamps having temperature-sensitive components or materials in the base region of the lamp, or where the temperature of the lamp socket or its surr…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.