Cathode filament for an ultra-violet discharge lamp

Details Cathode filament for an ultra-violet discharge lamp Cathode filament for an ultra-violet discharge lamp

1996-10-30

1999-01-26

Patel, Vip

Electric lamp and discharge devices

With gas or vapor

Discharge device with diverse electrodes

313578, 313631, 313344, H01J 1704

Patent

active

058642099

ABSTRACT:
A unique cathode (30) for an ultraviolet discharge lamp (10) is described. The cathode includes a triple-coil wire, i.e., the wire has a primary coil (43), a secondary coil (41) wound around the primary coil and a tertiary coil (36) wound around the secondary coil. The interstices of the primary coil and secondary coil, but not the tertiary coil, are occupied by a crystalline oxide emitter material. Filling the primary and secondary coils of the triple coil cathode provides a cathode having a greater amount of emitter material than prior art. In addition, as the outer layer of the emitter material sputters away from bombardment by positive ions, the remaining emitter material is protected by the now-exposed portion of the coil wire which protrudes beyond the remaining emitter material. Thus, incoming positive ions are apt to strike the exposed wire, and not the remaining emitter material.

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