Electric lamp subject to high operating temperatures
AssigneePatent-Treuhand-Gesellschaft F. Elektrische Gluehlampen mbH
InventorRalf Seedorf
Life of this patent
Estimating the term…
Abstract
To prevent corrosion of molybdenum connecting pins or wires extending from elt-sealed ends of high-power lamps, the region immediately adjacent the exit points from the melt-sealed end are cooled by a cooling gas, for example air or an inert gas such as nitrogen. The cooling gas is applied by cooling ducts which are made of metal and, simultaneously, provide for electrical connection of electrical energy to the connecting leads. Cooling gas can be introduced either through terminal pins or rods into the tubular elements, or the tubular elements can be connected, as usual, to the part-solid terminal pins or rods and additional gas connections are passed through the base through the tubular elements to supply cooling gas.
Claims12
High-power electric lamp having
- a lamp bulb (1, 1') having at least one melt-seal end (1a, 1b);
- two metal foils (2a, 2b) and two electrical connecting leads, one each (4a, 4b) electrically connected to each of the foils and extending outwardly of the bulb, and melt-sealed to the at least one melt-seal end (1a, 1b),
- a lamp base (5, 5'),
- electrical connection terminals (6a, 6b, 6a', 6b') for connecting the lamp to a source of electrical energy;
- connection means (7a, 7b, 7a', 7b') fitted in the base and electrically connecting said connection leads (4a, 4b) and said terminals
- and wherein, the base (5, 5') includes cooling gas connections (6a', 6b', 8a, 8b);
- and
- wherein the connection means (7a, 7b, 7a', 7b') comprises tubular elements terminating close to the at least one melt-seal end (1a, 1b) of the lamp bulb with the metal foils melt-sealed therein and pneumatically coupled to said cooling gas connections (6a', 6b', 8a, 8b), for directing a stream of cooling gas (G) to said at least one melt-seal end with the metal foil melt-sealed therein, and to adjacent portions of the respective connecting lead (4a, 4b).
Dependencies are inferred from the claim text.