Electric lamp and discharge devices – Electrode and shield structures – Filament or resistance heated electrodes
Patent
1983-06-10
1988-07-26
Lacey, David L.
Electric lamp and discharge devices
Electrode and shield structures
Filament or resistance heated electrodes
313344, 445 51, H01J 115, H01J 1908, H01J 904
Patent
active
047603062
ABSTRACT:
Electrons are copiously emitted by a device comprising a loop-shaped filament made of lanthanum hexaboride. The filament is directly heated by an electrical current produced along the filament by a power supply connected to the terminal legs of the filament. To produce a filament, a diamond saw or the like is used to cut a slice from a bar made of lanthanum hexaboride. The diamond saw is then used to cut the slice into the shape of a loop which may be generally rectangular, U-shaped, hairpin-shaped, zigzag-shaped, or generally circular. The filaments provide high electron emission at a relatively low operating temperature, such as 1600.degree. C. To achieve uniform heating, the filament is formed with a cross section which is tapered between the opposite ends of the filament to compensate for non-uniform current distribution along the filament due to the emission of electrons from the filament.
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Ehlers Kenneth W.
Leung Ka-Ngo
Pincosy Philip A.
Boyer Michael K.
Carnahan L. E.
Gaither Roger S.
Hightower Judson R.
Lacey David L.
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