Refractory helical overwound electrode for high pressure...

Details Refractory helical overwound electrode for high pressure... Refractory helical overwound electrode for high pressure...

H - Electricity

01

J

313/132

H01J 61/073 (2006.01)

Patent

CA 1165373

LD 7759 REFRACTORY HELICAL OVERWOUND ELECTRODE FOR HIGH PRESSURE METAL VAPOR LAMP Abstract of the Disclosure An electrode for a high pressure metal vapor lamp comprises a hollow helix of tungsten wire projecting from an inlead. An open-wound overwind of tungsten wire on the turns of the helix provides quasi-point-contact spacers between adjacent turns of the helix. This arrangement gives rigidity to the helix and provides a substantial increase in electrode surface area with low axial heat flow. The electrode has good spot transfer characteristics in moving the arc terminus to the tip and has low energy loss in operation. The electrode is particulary suitable as a cathode in a miniature d.c. metal halide lamp.

352172

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