Method of fabricating the diaphragm unit of a condenser microphone by electron beam welding
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United States of America Patent
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Aug 13, 1991
Issued Date -
N/A
app pub date -
Jan 16, 1990
filing date -
Mar 4, 1987
priority date (Note) -
Expired
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Abstract
A one-piece diaphragm unit for a condenser microphone fabricated by gripping a diaphragm with predetermined tension, between metallic first and second rings, and electron beam welding the two rings and diaphragm together. Preferably, one of the first and second rings is provided with an edge flange which is raised about its inner periphery and extends inwardly of the other ring, biasing thereinto the diaphragm. When the diaphragm unit is built in the condenser microphone, a support plate of an insulating material is disposed in engagement with the first ring.
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