Compact, single-ended fluorescent lamp with fill vapor pressure control
US4694215A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 3, 1985 |
| Grant date | Sep 15, 1987 |
| Priority date | — |
| Expiry date | Sep 3, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/523
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
To improve the stability of operation of a compact, single-ended fluoresc lamp under "base down" operation, and provide for a predetermined temperature "cold spot" defining the vapor pressure within the fluorescent lamp, and particularly for a lamp having four parallel tubular portions which are interconnected to form a continuous discharge vessel, one of the tubular portions which does not carry an electrode has a small tube or stub element (16) connected into a pinch seal terminating the particular tubular element, the stub element extending below the pinch seal and into the base of the lamp. The lamp is formed with two vertically arranged openings to provide for passage of cooling air, by thermal convection, from a lower opening (17), past the cooling tube or stub (16) and to an upper outlet vent opening (19). A socket, in which the lamp may be inserted, is preferably likewise formed with openings to permit passage of air thereinto, from a lower side to an upper opening which matches the alignment of the opening in the lamp base. Combination of such a lamp, with a lamp base with lamp operating circuit components, is readily possible, in which case the lamp operating circuit comp…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.