Electric lamp and discharge devices – With gas or vapor – Having particular electrode structure
Patent
1993-08-03
1995-06-06
O'Shea, Sandra L.
Electric lamp and discharge devices
With gas or vapor
Having particular electrode structure
313571, 313311, 313357, 445 49, 148649, H01J 6104, H01J 902
Patent
active
054225396
ABSTRACT:
To improve the operation of high-pressure discharge lamps by preventing pature deformation of the end face of an anode due to extremely high temperature, with subsequent vaporization of tungsten material from the electrode and deposition on the bulb or vessel of the high-pressure discharge lamp, the electrode is axially forged, for example by hammering, to compact and change the grain structure of the electrode towards a finer grain than elsewhere in the electrode and increase the hardness of the electrode across the end face surface. Both--higher density and finer grain structure--increase the parameters which characterize the lifetime of electrodes, and hence of the lamp, namely heat conductivity and resistance against deformation under heat stress.
REFERENCES:
patent: 2670451 (1964-02-01), Freeman et al.
patent: 4117367 (1978-09-01), de Bie et al.
patent: 4468586 (1984-08-01), Hohn
patent: 4575343 (1986-03-01), Kin et al.
patent: 4700107 (1987-10-01), Fischer
patent: 5258691 (1993-11-01), Dakin et al.
patent: 5304893 (1994-04-01), Nieda
O'Shea Sandra L.
Patel Ashok
Patent-Treuhand-Gesellschaft F. Elektrische Gluehlampen mbH
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