High pressure discharge vessel for an alumina high-intensity...

Details High pressure discharge vessel for an alumina high-intensity... High pressure discharge vessel for an alumina high-intensity...

2005-11-29

2005-11-29

Williams, Joseph (Department: 2879)

Electric lamp and discharge devices

With gas or vapor

Envelope with particular structure

C313S623000

Reexamination Certificate

active

06969951

ABSTRACT:
A discharge vessel or chamber for a high-intensity discharge lamp is provided, including a central body having a discharge space provided therein, two capillaries closing off respective end openings of the central body and an electrode positioned within each respective one of the capillaries. The central body and the capillaries comprise an alumina material or an alumina-based ceramic material. An average diameter of alumina grains in the central body is greater than an average diameter of alumina grains in the capillaries, and the average diameter of alumina grains in the capillaries is in a range of 10 μm to 25 μm.

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