Method of making a lead-in mount and seal
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United States of America Patent
Stats
-
Apr 30, 1991
Issued Date -
N/A
app pub date -
Aug 1, 1990
filing date -
Apr 24, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A thermal device, such as a glow discharge starter, includes an hermetically sealed envelope containing an ionizable medium, a bimetallic electrode having a bimetallic element associated therewith, and a counter electrode. A mount sealed in the envelope includes a glass stem having a disk-shaped portion extending substantially across the envelope and a longitudinally-extending planar portion. The transverse portion of the mount assists in centering the electrodes within the envelope and preventing the bimetallic element from oxidizing during the manufacturing process when the mount is sealed to the envelope. Preferably, the transverse portion is disk-shaped having a radius within the range of from about 89 to 93 percent of the internal radius of the envelope. The defined thickness of the planar portion of the glass stem allows rapid transfer of heat during sealing so that the planar portion can effectively be sealed to the envelope without developing seal cracks.
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