Glass manufacturing – Processes – Operating under inert or reducing conditions
Patent
1996-12-16
1999-11-09
Griffin, Steven P.
Glass manufacturing
Processes
Operating under inert or reducing conditions
65 34, 65 41, 65 43, 65 55, 65 592, 65 5922, 65 5925, 65 5927, 65 5928, 65 596, 65108, 445 26, 445 28, 445 29, H01J 932, C03B 2313, C03C 2700
Patent
active
059791870
ABSTRACT:
In a method of forming a glass to metal seal between one end of a glass lamp tube (for, for example, a flash lamp or laser lamp), a metal rod which is terminated by the electrode is heated, and has molten glass sealing material applied thereto to form a beaded sleeve. The tube to which the electrode is to be attached is heated, and further sealing material is applied to the end of the tube so as to create a dome of material which closes off that end. Excess sealing material is then removed from the dome so as to leave an annulus of sealing material around the end wall of the, now open, tube. The electrode and rod can then be inserted into the tube until the bead on the rod is near the annulus at the end of the tube, and the tube can be worked, while being rotated, down to form a frusto-conical end such that movement of the bead relative to the annulus then brings the two into contact while a positive gas pressure is maintained within the tube. The pressure between the inside and outside of the tube is then balanced while the tube is worked down onto the bead to cause the bead in the annulus to become completely fused. The tube is then pressurized so that the sealing material conforms to a smooth internal concave shape. Since the annulus of material is formed by removing excess material from the dome, it is possible to avoid the need to bring a carbon tool into contact with the annulus, thus avoiding possible contamination of the sealing material.
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Churchley Martin Ross
Lewandowski Janusz Karol
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