JPS57134835A - Thermion emission cathode - Google Patents

Thermion emission cathode

Info

Publication number
JPS57134835A
JPS57134835A JP1945581A JP1945581A JPS57134835A JP S57134835 A JPS57134835 A JP S57134835A JP 1945581 A JP1945581 A JP 1945581A JP 1945581 A JP1945581 A JP 1945581A JP S57134835 A JPS57134835 A JP S57134835A
Authority
JP
Japan
Prior art keywords
lab6
top end
end part
potential
plane
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP1945581A
Other languages
Japanese (ja)
Inventor
Yasuo Furukawa
Masaki Yamabe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP1945581A priority Critical patent/JPS57134835A/en
Publication of JPS57134835A publication Critical patent/JPS57134835A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
    • H01J1/02—Main electrodes
    • H01J1/13—Solid thermionic cathodes
    • H01J1/15—Cathodes heated directly by an electric current
    • H01J1/16—Cathodes heated directly by an electric current characterised by the shape

Landscapes

  • Solid Thermionic Cathode (AREA)

Abstract

PURPOSE:To obtain a thermion emission cathode wherein the top end part of an electron emission cathode made of LaB6 is composed of a two planes-crossed body containing at least more than one of plane azimuth 100; also at least one of planes azimuth 100 is left it is, and the other plane is covered with a electron emission suppressed film whose work function is comparatively large. CONSTITUTION:(1) is a single crystal LaB6, (2) is a carbon heating unit, (3) is an electrode, (4) is a grid and (5) is an anode; the carbon heating unit 2 is heated by forcing a current to flow through the electrode 3, and thermoelectrons are emitted from the LaB6 1 which is heated by said generation of heat. In this thermion emission, the electron emission area of the top end part 1T of LaB6 is controlled by a potential gradient wherein the anode is positive potential the grid is negative potential and the LaB6 is zero potential. In the initial stage of use of such electron gun, the top end part of which is gradually consumed and sharpened as a result of long use, even if said top end part 1T has a minute curvation of less than radius 10mum. Consequently, a low exponential crystal face appears on the side plane.
JP1945581A 1981-02-12 1981-02-12 Thermion emission cathode Pending JPS57134835A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1945581A JPS57134835A (en) 1981-02-12 1981-02-12 Thermion emission cathode

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1945581A JPS57134835A (en) 1981-02-12 1981-02-12 Thermion emission cathode

Publications (1)

Publication Number Publication Date
JPS57134835A true JPS57134835A (en) 1982-08-20

Family

ID=11999787

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1945581A Pending JPS57134835A (en) 1981-02-12 1981-02-12 Thermion emission cathode

Country Status (1)

Country Link
JP (1) JPS57134835A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0207772A2 (en) * 1985-07-02 1987-01-07 Wilhelm Heinrich Dr. Brünger Electron source of lanthanum hexaboride and method of constructing same
GB2389450A (en) * 2001-10-30 2003-12-10 York Electron Optics Ltd Electron source

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52110563A (en) * 1976-03-15 1977-09-16 Hitachi Ltd Hexagonal boride cathode
JPS5588233A (en) * 1978-12-26 1980-07-03 Denki Kagaku Kogyo Kk Hexaboride single crystal cathode

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52110563A (en) * 1976-03-15 1977-09-16 Hitachi Ltd Hexagonal boride cathode
JPS5588233A (en) * 1978-12-26 1980-07-03 Denki Kagaku Kogyo Kk Hexaboride single crystal cathode

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0207772A2 (en) * 1985-07-02 1987-01-07 Wilhelm Heinrich Dr. Brünger Electron source of lanthanum hexaboride and method of constructing same
EP0207772A3 (en) * 1985-07-02 1987-11-19 Wilhelm Heinrich Dr. Brünger Electron source of lanthanum hexaboride and method of constructing same
GB2389450A (en) * 2001-10-30 2003-12-10 York Electron Optics Ltd Electron source

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