Title:
ELECTRON GUN
Document Type and Number:
Japanese Patent JP3423111
Kind Code:
B2
Abstract:
PURPOSE: To realize an electron gun wherein a large current is obtained further with a long life, in the indirectly heated electron gun which emits a thermal electron with a cathode heated by irradiation of an electron beam emitted from an auxiliary electron gun.
CONSTITUTION: In this constitution, an LaB6 single crystal provided with a step difference for preventing coming off is used in a cathode 1, to coat a total surface except an electron emitting surface of the LaB6 cathode 1 with a burned unit or sintered unit mainly composed of B4C. Here is burned or sintered the burned unit or the sintered unit by compounding B4C powder, additive and a binder. Thus by suppressing diffusing B from the LaB6 cathode, in the B4C, corrosion of the burned unit or sintered unit and consuming LaB6 in a surface except the electron emitting surface are reduced. As a result, extending of a life of an electron gun is attained.
Inventors:
Katsuya Sugiyama
Katsuhiro Kuroda
Masatoshi Nishimura
Hiroshi Kumasaka
Toshiyuki Aida
Katsuhiro Kuroda
Masatoshi Nishimura
Hiroshi Kumasaka
Toshiyuki Aida
Application Number:
JP14576595A
Publication Date:
July 07, 2003
Filing Date:
June 13, 1995
Export Citation:
Assignee:
Hitachi Medical Co., Ltd.
International Classes:
H01J1/20; H01J37/075; G21K1/00; (IPC1-7): H01J37/075; G21K1/00; H01J1/20
Domestic Patent References:
| JP7335161A | ||||
| JP5128963A | ||||
| JP3147225A | ||||
| JP6388738A | ||||
| JP545840A | ||||
| JP5638029B1 |
Attorney, Agent or Firm:
Katsuo Ogawa (1 person outside)
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