Electric lamp and discharge devices – With temperature modifier – Electric heater
Patent
1989-03-10
1990-10-23
DeMeo, Palmer C.
Electric lamp and discharge devices
With temperature modifier
Electric heater
313 44, 313 46, 313634, 313611, H01J 6130, H01J 6120, H01J 6152
Patent
active
049654845
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.
REFERENCES:
patent: 2629836 (1953-02-01), Deri
patent: 4024431 (1977-05-01), Young
patent: 4074163 (1978-02-01), Van der Leeuw
patent: 4095142 (1978-06-01), Murayama et al.
DeMeo Palmer C.
Schneck Thomas
Tencor Instruments
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