Lamp with radially graded cermet feedthrough assembly

Electric lamp and discharge devices – With gas or vapor – Having electrode lead-in or electrode support sealed to...

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313623, H01J 524, H01J 526

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active

060206853

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 radially 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 cermetfeedthrough assemblies allow the metal halide lamps to operate at high wall temperatures with better lumen output, color temperature, and CRI.

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