Fluorescent lamp cathode and method of making cathodes

Details Fluorescent lamp cathode and method of making cathodes Fluorescent lamp cathode and method of making cathodes

2005-02-16

2008-12-09

Roy, Sikha (Department: 2879)

Electric lamp and discharge devices

With gas or vapor

Having particular electrode structure

C313S631000, C313S344000, C445S048000, C445S049000

Reexamination Certificate

active

07462991

ABSTRACT:
A method of making cathodes includes forming a first intermediate assembly having a current wire in juxtaposition with an outer mandrel wire and a basket wire wound around the first two wires. The first intermediate assembly is wound around a central mandrel to form a second intermediate assembly. Pulses of energy are used to produce an alloy solder joint between the current wire and the basket wire at selected locations. The second intermediate assembly is cut into segments, and the mandrels are removed. This results in a cathode having a coiled current wire and a basket wire wound around the current wire, with the basket wire being bonded to the current wire by the alloy solder joints. The cathode includes a central bore that is substantially free of the alloy solder joint.

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