Electrode for a high-pressure discharge lamp, and methods of its

Details Electrode for a high-pressure discharge lamp, and methods of its Electrode for a high-pressure discharge lamp, and methods of its

1998-07-23

2000-08-29

Ramsey, Kenneth J.

Electric lamp or space discharge component or device manufacturi

Process

Electrode making

313631, H01J 914

Patent

active

061099953

ABSTRACT:
The electrode of tungsten material has a cylindrical shaft and a conical tip, in which the conical tip is made essentially by radial deformation, such as hammering or cross-rolling, of the tip portion (9) of the electrode blank (5). This changes the grain structure to be converging. A flat top or plateau (10) can be ground at the very end of the tip.

REFERENCES:
patent: 3678575 (1972-07-01), Akeyama et al.
patent: 4117367 (1978-09-01), De Bie et al.
patent: 4803395 (1989-02-01), Matesco
patent: 4859239 (1989-08-01), Passmore
patent: 4906895 (1990-03-01), Pabst et al.
patent: 5179313 (1993-01-01), Eves et al.
patent: 5422539 (1995-06-01), Chodora
patent: 5774780 (1998-06-01), Prause
"VDI Nachrichten" ("Bulletin of the Association of German Engineers") , No. 20, May 17, 1996, p. 11, entitled (translated) "Cross-rolling saves metal scrap".
Patent Abstracts of Japan; vol. 015, No. 250 (E-1082), Jun. 26, 1991 & JP 078929 A (Yokogawa Electric Corp), Apr. 4, 1991.

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