Title:
【発明の名称】冷陰極
Document Type and Number:
Japanese Patent JP2897520
Kind Code:
B2
Abstract:
Disclosed is a cold cathode (5) which has an emitter (2) formed in the center portion (6) where ion bombardment is likely to occur, and a gate (4) formed partially thicker, or which has a metal layer with the same potential as the emitter (2) and a high melting point, formed in the center portion (6) of the cathode. Therefore, even bombardment of positive ions at the center portion (6) of the cold cathode (5) will not affect the electron emission, thereby ensuring an always stable cathode current or electron beam. Further, as the cold cathode (5) is designed to prevent the deterioration of the insulation between the emitter (2) and gate (4), abrupt stopping of the electron emission hardly occurs. Therefore, an electron tube using this cold cathode (5) has a stable function and high reliability.
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Inventors:
MAKISHIMA HIDEO
YAMADA KEIZO
IMURA HIRONORI
YAMADA KEIZO
IMURA HIRONORI
Application Number:
JP8014692A
Publication Date:
May 31, 1999
Filing Date:
April 02, 1992
Export Citation:
Assignee:
NIPPON DENKI KK
International Classes:
H01J1/304; H04L12/28; H04L69/40; (IPC1-7): H01J1/30
Domestic Patent References:
| JP61128439A | ||||
| JP53121454A |
Attorney, Agent or Firm:
Naoki Kyomoto (2 outside)