Electrode structure for single ended high pressure discharge lam

Details Electrode structure for single ended high pressure discharge lam Electrode structure for single ended high pressure discharge lam

1989-01-13

1990-06-26

Yusko, Donald J.

Electric lamp and discharge devices

With gas or vapor

Having particular electrode structure

313 43, 313335, 313620, 313621, 313633, H01J 6104

Patent

active

049374958

ABSTRACT:
To improve the heat distribution of the electrodes within a high-pressure discharge vessel, particularly a vehicle (1) of quartz glass having a fill of mercury, a noble gas, and an additive which includes a metal or metal halide, especially, for good color rendition, tin which attacks the electrodes, the electrodes (4, 5) are pinch-sealed through the quartz glass envelope and include a parallel shaft portion (15, 17, 21) to which pin elements (16, 18, 19) are attached, for example by welding, which have a cross-sectional area larger, preferably by a factor of between 1.5 to 3, than the cross-sectional area of the shaft portion, to obtain high heat capacity of the electrodes while minimizing heat transfer to the pinch or press seal of the electrodes through the quartz glass vessel (2) via the shaft portions.

REFERENCES:
patent: 1655488 (1928-01-01), Wolff et al.
patent: 2459579 (1949-01-01), Noel
patent: 2662196 (1953-12-01), Buckingham
patent: 2697183 (1954-12-01), Neunhoeffer et al.
patent: 3625068 (1972-07-01), Strauss
patent: 4038579 (1977-07-01), Ekkelboom
patent: 4320322 (1982-03-01), Rothwell, Jr. et al.
patent: 4633136 (1986-12-01), Fromm et al.
Carless et al.; Lamps and Lighting, 3rd ed.; 1983, pp. 169-172.
"Electrode Development for Small Halogen Metal Vapor Lamps", published in chnisch-wissenschaftliche Abhandlugen der OSRAM-Gesellschaft (Technological and Scientific Discussions of the OSRAM Company), vol. 12, pp. 65-72 et seq. published by Springer, Berlin, 1986, Fromm et al.

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