Ceramic envelope device, lamp with such a device, and method of

Details Ceramic envelope device, lamp with such a device, and method of Ceramic envelope device, lamp with such a device, and method of

1997-06-27

1999-01-19

Patel, Ashok

Electric lamp and discharge devices

With gas or vapor

Having electrode lead-in or electrode support sealed to...

313572, 313636, 220 21R, H01J 1718, H01J 6136

Patent

active

058617140

ABSTRACT:
This invention involves a new type of feedthrough-plug member for metal halide HID lamp using PCA envelopes. The construction of the lamp housing consists of a PCA envelope and specially designed axially graded alumina-metal cermet multi-layers to eliminate cracking in cermet or PCA due to thermal stresses arising from thermal expansion mismatch. The fills are metal halides such as Na--Sc--I, rare earth halides, Hg, Sn, and inert gases. The PCA vessel and directly sealed cermet-feedthrough assemblies allow the metal halide lamps to operate at high wall temperatures with better lumen output, color temperature, and CRI.

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