Multi-layer oxide coating for high intensity metal halide discha

Details Multi-layer oxide coating for high intensity metal halide discha Multi-layer oxide coating for high intensity metal halide discha

1991-11-22

1993-12-14

Yusko, Donald J.

Electric lamp and discharge devices

With gas or vapor

Envelope with particular structure

313638, 313489, H01J 6135, H01J 6118

Patent

active

052706150

ABSTRACT:
A coating for the arc tube of a high intensity metal halide discharge lamp includes at least two oxide layers for protecting the arc tube from devitrification, cracking and etching of the arc tube wall and for avoiding arc instability, thereby extending the useful life of the lamp. A first layer of the multi-layer oxide coating is applied directly to the arc tube to provide thermal compatibility in order to avoid cracking during lamp operation. At least one additional layer provides chemical stability of the arc tube wall with respect to the lamp fill. As a result, a substantial loss of the metal portion of the fill and a corresponding substantial buildup of free halogen are avoided, thereby avoiding devitrification and etching of the arc tube wall. Furthermore, for HID lamps including as a fill ingredient a metal, such as sodium, which diffuses into the arc tube wall and causes further devitrification thereof, at least one layer of the multi-layer oxide coating acts as metal-barrier.

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