Cathode for high intensity discharge lamp

Details Cathode for high intensity discharge lamp Cathode for high intensity discharge lamp

1994-09-01

1995-09-19

O'Shea, Sandra L.

Electric lamp and discharge devices

With gas or vapor

Having electrode heated by space discharge current

313574, 313631, 313632, 313335, H01J 6106

Patent

active

054518377

ABSTRACT:
A cathode for a discharge lamp includes a longitudinally extending central core of a high temperature, electrically conductive metal; and a coil of high temperature, electrically conductive metal wound thereabout, said coil being fastened to said core at least in part by mechanical interference. The mechanical interference can be achieved by keyways formed in the core surface. During winding, at least some of the turns of the coil enter the keyways providing a good, mechanical engagement of the coil with the core. The keyways can be formed by heating the core and compressing or forging areas with tools or the keyways can be formed by grinding or by any other suitable means.

REFERENCES:
patent: 3168668 (1965-02-01), Rexer
patent: 3170081 (1965-02-01), Rokosz
patent: 3849690 (1974-11-01), Cosco et al.
patent: 4275329 (1981-06-01), Fridrich et al.
patent: 4847534 (1989-07-01), der Kinderen et al.
patent: 4952841 (1990-08-01), Coomans et al.

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