Ceramic discharge vessel having aluminum oxynitride seal region

Details Ceramic discharge vessel having aluminum oxynitride seal region Ceramic discharge vessel having aluminum oxynitride seal region

2008-04-22

2008-04-22

Macchiarolo, Peter (Department: 2879)

Electric lamp and discharge devices

With gas or vapor

Envelope composition

C313S623000

Reexamination Certificate

active

11047069

ABSTRACT:
The present invention is a ceramic discharge vessel for use in high-intensity-discharge (HID) lamps. The discharge vessel has a ceramic body and at least one seal region comprised of an aluminum oxynitride material. The seal region further has a surface layer for contacting a frit material wherein the surface layer is less reactive than the aluminum oxynitride material with respect to the molten frit during sealing. Preferably, the surface layer has a lower nitrogen content than the aluminum oxynitride material. The less reactive surface acts to minimize the formation of bubbles in the sealing frit during the sealing operation.

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