Thermionic electron source
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United States of America Patent
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-
Jun 2, 1992
Grant Date -
N/A
app pub date -
Mar 19, 1990
filing date -
Mar 24, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A high temperature low density operating element includes a porous high temperature operating element film formed into a predetermined configuration and disposed on one surface of an insulating member with good heat conductivity, a resistive film with a high melting point and good heat conductivity having a higher density than the high temperature operating element film, formed into a predetermined configuration on a second surface of the insulating member with good heat conductivity, a lead wire connected to the resistive film, an insulating protective film disposed on the insulating member covering the resistive film.
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