Fused silica lamp envelope and seal

Details Fused silica lamp envelope and seal Fused silica lamp envelope and seal

H - Electricity

01

J

313/135

H01J 5/34 (2006.01)

Patent

CA 1122255

LD-7652 ABSTRACT OF THE DISCLOSURE A seal into a fused silica envelope comprises a re- factory metal wire extending through an aperture in a fused silica neck leading into the envelope. A bead of glass having a coefficient of expansion intermediate those of the refractory metal and of the fused silica is formed around and wets the wire inlead. A hermetic seal is achieved by causing fused silica from the neck to shrink around the bead and be wetted by it, forming an annular sealing zone spaced out from the wire inlead. The wire may be of tungsten in which case the electrode and inlead may be of one piece without a joint.

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