| 摘要 |
An arc tube mounting assembly ( 1 ) for a metal halide arc lamp ( 10 ) includes frame members ( 8, 9 ) for supporting an arc tube ( 2 ). The arc tube ( 2 ) is supported from above by a looped frame member ( 8 ) having a loop ( 8 A) which extends along opposing sides, and across top and base ends ( 2 A, 2 B) of the arc tube ( 2 ), thus evenly distributing the current to discharge electrode 7, thereby cancelling magnetic forces which could displace the arc from the center of the arc tube ( 2 ), resulting in improved lumen maintenance and extended life. A centering circle ( 8 B) of the frame member ( 8 ) wraps around the lower ceramic end plug ( 4 ), providing coaxial alignment of the arc tube ( 2 ) and the tubular outer envelope ( 11 ).
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