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Title:
IMPREGNATION TYPE CATHODE STRUCTURE
Document Type and Number:
Japanese Patent JPH0644890
Kind Code:
A
Abstract:

PURPOSE: To prevent the drop of the cathode temp. due to the elongation of a heater installed inside of a cylindrical cathode of impregnation type, when the heater is turned on and off, and prevent shortcircuiting between the heater and cathode.

CONSTITUTION: The bottom of a heater coil 4 installed inside of a cylindrical cathode of impregnation type is supported by a heater supporting plate 10. This hinders the heater coil 4 from conducting linear expansion downward. Accordingly the metal base 5 is heated certainly by the heater coil 4.


Inventors:
MORI SHIGERU
Application Number:
JP21721792A
Publication Date:
February 18, 1994
Filing Date:
July 23, 1992
Export Citation:
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Assignee:
NEC CORP
International Classes:
H01J1/28; H01J1/15; H01J23/05; (IPC1-7): H01J1/15; H01J23/05
Attorney, Agent or Firm:
菅野 中