Electric lamp and discharge devices – Discharging devices with apertured electrode interposed...
Patent
1978-05-03
1981-04-21
Chatmon, Jr., Saxfield
Electric lamp and discharge devices
Discharging devices with apertured electrode interposed...
313107, 313348, 313444, 313448, H01J 146, H01J 2110
Patent
active
042635284
ABSTRACT:
In an electron gun having a control grid in contact with the face of the cathode, unwanted thermionic emission from the cathode can be effectively suppressed by applying a thin (1 micron) coating of boron nitride to the surface of the control grid. The boron nitride has low thermionic emission itself and, in addition, has an unusual ability to shed or eliminate any deposits of emissive material such as barium or its oxides which come in contact with the boron nitride layer. For optimum performance and longest lifetime, the boron nitride layer is applied over a pyrolytic graphite layer which may be the conductive grid itself.
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Chatmon, Jr. Saxfield
Cole Stanley Z.
Nishimura Keiichi
Sgarbossa Peter J.
Varian Associates Inc.
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