Incandescent lamp having two lead-in conductors sealed within one end and including expansion means
US4626735A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 23, 1985 |
| Grant date | Dec 2, 1986 |
| Priority date | — |
| Expiry date | Aug 23, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01K9/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A tungsten-halogen lamp including a tubular quartz envelope wherein both of the lead-in conductors designed for providing electrical energy to the lamp's coiled filament are strategically positioned within a single, press-sealed end portion of the lamp's envelope. Electrical connections to the lamp may thus be provided at only one end thereof to thereby facilitate positioning and connection of the lamp within a photocopier or similar machine. The lamp is suited for high wattage applications (i.e., about two-hundred watts per linear inch of filament or greater) by the utilization of an expansion coil section which is provided in one of the lamp's two lead-in conductors to prevent bowing of the lead-in conductor and its quartz sleeve. This coil section enables the conductor to expand during the high temperatures encountered when the lamp is operated at such high wattages.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.