Short-arc discharge lamp

Details Short-arc discharge lamp Short-arc discharge lamp

1979-04-19

1984-11-06

Moore, David K.

Electric lamp and discharge devices

With gas or vapor

Envelope composition

H01J 6330

Patent

active

044814437

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 with in the range from 11 to 17.times.10.sup.-7 per deg C.

REFERENCES:
patent: 2060043 (1936-04-01), Cox
patent: 3564328 (1971-02-01), Bagley et al.
patent: 4091951 (1978-05-01), Zijlstra et al.
patent: 4104418 (1978-08-01), Park et al.

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