Halogen incandescent lamp and method of manufacturing a halogen incandescent lamp
AssigneeU.S. Philips Corporation
InventorHenrikus J. H. Pragt
Life of this patent
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Abstract
The halogen incandescent lamp has a tipless lamp vessel (1) having a first seal (3), in which a current supply conductor (7) with a foil-shaped part (9) of small width (w.sub.1) is accommodated, and a second seal (4), in which a current supply conductor (8) with a foil-shaped part (10) of larger width (w.sub.2) is accommodated. This construction permits a simple method of manufacturing the lamp, in which the tube from which the lamp vessel (1) is formed has a constriction which allows the first current supply conductor (7) and the filament (5) to pass, but stops the foil-shaped part (10) of the second current supply conductor (8) and holds the filament positioned in axial direction in the tube.
Claims5
An incandescent lamp comprising a sealed, tubular, tiples envelope containing a halogen containing gas and having a central longitudinal axis along which is disposed a filament and first and second current supply conductors connected to respective first and second ends of the filament, characterized in that:
- a. the first current supply conductor includes an intermediate widened portion having a width which is smaller than a first internal diameter of an adjacent first portion of the envelope which exists before sealing of the envelope, but is larger than a second internal diameter of the envelope for stopping entry of the widened portion into the envelope and facilitating axial positioning of the filament before sealing of the envelope, and having a thickness which is substantially smaller than said second internal diameter;
- b. the second current supply conductor includes an intermediate widened portion having a width which is smaller than both the second internal diameter and the internal diameter of an adjacent second portion of the envelope which exists before sealing of the envelope;
- and
- c. the envelope is sealed around the widened portions of the first and second current supply conductors, with distal ends of said conductors projecting from respective ends of said envelope.
A method of manufacturing a halogen incandescent lamp comprising a tipless glass lamp vessel sealed in a vacuum-tight manner and having an axis, this lamp vessel having on each side a first and a second seal, respectively, in which
- a filament having an axis is connected to a first and a second current supply conductor having a first and a second foil-shaped part, respectively, and an external part connected thereto, which foil-shaped parts each have a width dimension transverse to the axis of the filament,
- the filament is axially introduced into a glass tube having an axis through an open first end thereof, means being provided for holding the filament positioned in the axial direction of the tube,
- the glass tube is heated at the area of the first foil-shaped part and a first seal is formed in the tube, in which the first foil-shaped part is accommodated;
- the tube is filled with a halogen-containing gas,
- the tube is sealed in a vacuum-tight manner by heating the tube at the area of the second foil-shaped part and forming a second seal in the tube in the axial direction at a certain distance from the seal, the second foil-shaped part being accommodated in this second seal, characterized in that the width dimension of the second foil-shaped part is larger than the width dimension of the first foil-shaped part and the glass tube has a constriction which allows the first current supply conductor and the filament to pass and stops the second foil-shaped part.
Dependencies are inferred from the claim text.