Halogen cycle incandescent lamp having an intermediate lead-in conductor part

US4490646A · kind A · utility

Assignee

• Patent-Treuhand-Gesellschaft fur elektrische Gluhlampen mbH · DE

Inventors

• Axel Bunk · Berlin, DE
• Karl-Heinz Stadler · Adelschlag, DE

Key dates

• Filing date: May 19, 1982
• Grant date: Dec 25, 1984
• Expiry date: May 19, 2002

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01K1/40
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

To prevent the occurrence of brittle weld junctions upon joining thin intal lead-in wires (3a, 3a') to thicker connecting pin wires (3b, 3b'), an intermediate element of nickel (4) is positioned between the thinner and thicker wire parts, the nickel joining easily with the two parts of the molybdenum wires. The junction molybdenum-nickel-molybdenum, or tungsten-nickel-tungsten in case tungsten wires are used, is preferably located within the region of the press (5) of the lamp (1). In contrast to direct welding of molybdenum to molybdenum, or tungsten to tungsten, the weld does not decay.