Short-arc discharge lamp

Details Short-arc discharge lamp Short-arc discharge lamp

H - Electricity

01

J

313/135

H01J 61/35 (2006.01) H01J 61/36 (2006.01)

Patent

CA 1135780

1 PHN, 9129. ABSTRACT: A short-arc discharge lamp having tungsten electrodes, tungsten electrode pins, and a sealed vacuum-tight lamp envelope filled with a rare gas. Hitherto the electrode pins have been sealed into neck- shaped portions of the envelope using graded seals. In a lamp according to the invention, the electrode pins extend through neck-shaped portions of the envelope. In the vicinity of the respective envelope to electrode pin seal, the electrode pin bears a local glass coating. An annular glass bead-shaped member is sealed to this glass coating and the neck-shaped portion is sealed to at least part of the length (in the direction of the longitudinal axis of the electrode pin) of the bead-shaped member. The glass coating and the bead-shaped member each have a coefficient of thermal expansion within the range from 11 to 17 x 10-7 per deg C.

327935

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