High pressure discharge lamp having filament electrodes

Details High pressure discharge lamp having filament electrodes High pressure discharge lamp having filament electrodes

1993-09-24

1995-11-28

O'Shea, Sandra L.

Electric lamp and discharge devices

With temperature modifier

Double wall, jacket or casing for envelope

313 27, 313 47, 313 44, 313571, 313574, 313632, 313641, 313642, H01J 61073, H01J 6122, H01J 6136

Patent

active

054711100

ABSTRACT:
A high pressure discharge lamp having a discharge vessel with opposing end chambers includes discharge electrodes each consisting of an open elongate filament of refractory metal wire having a plurality of succesive coil turns extending transverse to the longitudinal axis of the discharge vessel. The filament electrodes are dimensioned so that the discharge arc which terminates thereon is sufficiently retracted into the end chamber of the discharge vessel so that the fill constituents condense on a region of the discharge vessel which is primarily axially between the filament electrodes. In a favorable embodiment, the lamp is a metal halide lamp in which the electrode and the discharge sustaining fill is free of thoria and its compounds.

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Lamp Catalog and Technical Guide 1991-1992 Brochure, pp. 1-48.

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