Electrode design in a ceramic metal halide (cmh) lamp
AssigneeGeneral Electric Company
InventorsAgoston Boroczki, Akos Peter, Erazmus Gerencser
Life of this patent
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Abstract
Provided is an electrode assembly for a CMH lamp containing: primary mandrel surrounded by a secondary mandrel, which is nested inside of a coil overwind. The assembly of the primary mandrel, secondary mandrel, and coil overwind are connect to an electrode on one end and a lead wire on the other end and housed in ceramic housing. This assembly is efficient for increased thermal resistance of a CMH electrode while at the same time allowing seal glass to penetrate seal voids within the ceramic assembly.
Claims20
An electrode assembly comprising:
- an overwind assembly including a secondary mandrel wire and a coil wire;
- wherein the coil wire is configured to receive the secondary mandrel wire, locating the secondary mandrel inside and proximal to a cylinder created by the coil wire helix and along a longitudinal axis of the secondary mandrel wire;
- and
- a primary mandrel wire configured to be received by the overwind assembly, the overwind assembly being received around the diameter of the primary mandrel.
A ceramic metal halide (CMH) lamp comprising:
- a ceramic body having a discharge chamber and an opening defining a cylinder formed by two parallel spaced legs;
- an electrode assembly including a tungsten electrode, a niobium mandrel wire, a molybdenum primary mandrel wire, and overwind assembly having, a molybdenum secondary mandrel wire, and a molybdenum coil wire;
- wherein the molybdenum secondary mandrel wire is received around a circumference created by the coil wire helix about the longitudinal axis of the molybdenum secondary mandrel wire;
- and
- wherein the overwind assembly is received around the diameter of the molybdenum primary mandrel;
- and
- at least a first seal extending over at least a portion of the niobium mandrel wire and over a limited portion of the molybdenum primary mandrel wire and the overwind assembly.
A method for controlling the sealing of an electrode assembly, comprising:
- introducing a primary mandrel wire having a first and second end point, inside and proximal to an overwind assembly comprising a secondary mandrel wire and a coil wire, wherein the secondary mandrel wire is located inside and proximal to the coil wire;
- attaching the primary mandrel wire and the overwind assembly to a first and second lead wire, one connecting to an electrode, wherein the one lead wire is attached to one end point of the primary mandrel wire and the other lead wire is attached to the remaining end point of the primary mandrel wire;
- introducing the primary mandrel wire connected to the first and second lead wires and the overwind assembly into an opening defined by a cylinder formed by two parallel spaced legs, wherein the a surface of the overwind assembly is proximal to one of the parallel spaced legs;
- and
- bonding a portion of the primary mandrel wire and overwind assembly to the parallel spaced legs, wherein a bonding material penetrates existing voids between the primary mandrel wire and the overwind assembly.
Dependencies are inferred from the claim text.