Single-ended high-pressure discharge lamp with coil and mandrel

Details Single-ended high-pressure discharge lamp with coil and mandrel Single-ended high-pressure discharge lamp with coil and mandrel

1987-11-16

1989-07-25

Yusko, Donald J.

Electric lamp and discharge devices

With gas or vapor

Having particular electrode structure

313621, 313633, H01J 1704, H01J 61073

Patent

active

048517356

ABSTRACT:
To improve the heat distribution of single-ended metal-halide high-pressure discharge lamps, and particularly lamps in which the fill is apt to attack a helically wound electrode (4) facing a similar electrode (5) within a discharge vessel (2), the end portions of the electrodes have a mandrel or pin element (17) located within a plurality of coiled windings (16), such that the coiled windings of the electrodes surround the mandrel or pin elements (17). Preferably, the mandrel is made of thorium dioxide-doped tungsten, and the electrodes includes an electrode shaft portion (15) pinch-sealed through the quartz-glass vessel. The shaft portions are unitary with the coiled windings (16) and are made of undoped, essentially pure tungsten. The mandrel (17) may be retained within the coiled filament portion (16) by clamping or by being end-melted thereto, and preferably projects beyond the helical windings at the side remote from the discharge to improve the overall temperature distribution within the discharge vessel (2).

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Kaufman; FES Lighting Handbook; 12/86, 4th Edition, p. 8-5.
"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, p. 65 et seq. Published by Springer, Berlin 1986.

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