Vapor discharge lamp with gradient temperature control
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United States of America Patent
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-
Oct 23, 1990
Grant Date -
N/A
app pub date -
Mar 10, 1989
filing date -
Mar 10, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An end-viewed vapor discharge lamp having a differential temperature control structure that removes heat more effectively from a base end of the lamp than from the light emitting output end of the lamp. The lamp envelope which contains an excitable vapor, such as mercury, includes a small bore capillary tube with a window at one end. A large bore extension contiguous with the capillary tube and a parallel second tube contain electrodes for providing a discharge in the capillary tube. A thermally conductive shell surrounds and is spaced apart from sides of the envelope and is partly filled with a thermally conductive material around the base end of the envelope. The output end around the capillary tube is free of this material. Heat conduction is better at the base end so that the capillary tube runs hotter, inhibiting condensation of vapor and giving a stable light output. An optional heater pad may be provided around the shell for maintaining an optimal temperature for maximum light output.
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