Electric lamp and discharge devices – With gas or vapor – Envelope with particular structure
Patent
1988-02-18
1989-10-31
Yusko, Donald J.
Electric lamp and discharge devices
With gas or vapor
Envelope with particular structure
313 22, 313 36, 31323171, 313573, 313609, 220 21R, H01J 6130, H01J 6152
Patent
active
048779970
ABSTRACT:
An end-viewed low-pressure gas discharge lamp and an envelope for said lamp having a capillary tube discharge bore for containing an excitable gas in which the capillary tube is in direct contact with a cooling medium. A window of optical quality fused silica, a thin section of bubble and particle free glass blown quality silica or sapphire is disposed on an end of the capillary tube for emitting light from a discharge of the excitable gas. A pair of electrodes are hermetically sealed through the envelope for producing a discharge in the capillary tube between the electrodes. The envelope may include a return path parallel to the capillary tube or a side tube as a means for connecting the two ends of the capillary tubes with the electrodes without obstructing the end view of the discharge. Filling the envelope with an excitable mixture of one or more gases, such as vaporized mercury, to a less than atmospheric pressure, and connecting the electrodes to a power supply completes the lamp. Cooling of the capillary tube may be with air or with water in a jacket surrounding the envelope.
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Horabik Michael
Schneck Thomas
Tencor Instruments
Yusko Donald J.
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