High-pressure metal halide discharge lamp with electrodes substa

Details High-pressure metal halide discharge lamp with electrodes substa High-pressure metal halide discharge lamp with electrodes substa

1994-10-07

1996-06-25

Patel, Nimeshkumar D.

Electric lamp and discharge devices

With gas or vapor

Electrode composition

313630, 313346R, H01J 61073

Patent

active

055303170

ABSTRACT:
The high-pressure metal halide discharge lamp has tungsten electrodes in a light-transmitting lamp vessel which is closed in a vacuumtight manner. The electrodes comprise an emitter which is distributed throughout their mass and is formed by a first oxide chosen from hafnium oxide and zirconium oxide and by a second oxide chosen from yttrium oxide, lanthanum oxide, cerium oxide and scandium oxide, and are substantially free from thorium oxide. The lamp retains its initial light output to a high degree throughout its life.

REFERENCES:
patent: 3700951 (1972-10-01), Clarke et al.
patent: 4052634 (1977-10-01), De Kok
patent: 4136227 (1979-01-01), Saito et al.
patent: 4303848 (1981-12-01), Shimizu et al.
patent: 4574219 (1986-03-01), Davenport et al.

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