JPS5760639A - Heat megative electrode consisting of single crystal of hexaboromide - Google Patents

Heat megative electrode consisting of single crystal of hexaboromide

Info

Publication number
JPS5760639A
JPS5760639A JP13394680A JP13394680A JPS5760639A JP S5760639 A JPS5760639 A JP S5760639A JP 13394680 A JP13394680 A JP 13394680A JP 13394680 A JP13394680 A JP 13394680A JP S5760639 A JPS5760639 A JP S5760639A
Authority
JP
Japan
Prior art keywords
hexaboromide
single crystal
negative electrode
apex
tip
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
JP13394680A
Other languages
Japanese (ja)
Inventor
Hideo Hiraoka
Hirotoshi Hagiwara
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.)
Denka Co Ltd
Original Assignee
Denki Kagaku Kogyo KK
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 Denki Kagaku Kogyo KK filed Critical Denki Kagaku Kogyo KK
Priority to JP13394680A priority Critical patent/JPS5760639A/en
Publication of JPS5760639A publication Critical patent/JPS5760639A/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 provide stable availability of a heat negative electrode for long huors, under the condition of the poor vacuum by forming each of the cone angle of the tip of hexaboromide single crystal and radius of curvature of its apex in each special configuration. CONSTITUTION:The tip of hexaboromide single crystal having the crystal structure of calcium hexaboromide type is used for the negative electrode of a physical and chemical device using electron beam. As the hexaboromide single crystal, the one of Sr, B6, BaB6, etc. and of <100>, <110>, <210>, etc. as crystal orientation is used. The configuration of a negative electrode tip is formed by a single crystal up with a conic angle in the range of 40 deg.-120 deg. and 20-80mum radius of curvature at its apex. Thereby, even under the poor vacuum, it takes a long time for the development of a corner line to reach the peak value and it is possible to maintain good beam stability because the apex of the negative electrode is round.
JP13394680A 1980-09-26 1980-09-26 Heat megative electrode consisting of single crystal of hexaboromide Pending JPS5760639A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13394680A JPS5760639A (en) 1980-09-26 1980-09-26 Heat megative electrode consisting of single crystal of hexaboromide

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13394680A JPS5760639A (en) 1980-09-26 1980-09-26 Heat megative electrode consisting of single crystal of hexaboromide

Publications (1)

Publication Number Publication Date
JPS5760639A true JPS5760639A (en) 1982-04-12

Family

ID=15116757

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13394680A Pending JPS5760639A (en) 1980-09-26 1980-09-26 Heat megative electrode consisting of single crystal of hexaboromide

Country Status (1)

Country Link
JP (1) JPS5760639A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2389450A (en) * 2001-10-30 2003-12-10 York Electron Optics Ltd Electron source
JP2013134874A (en) * 2011-12-26 2013-07-08 National Institute For Materials Science Filament and method for manufacturing the same

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51126030A (en) * 1975-04-24 1976-11-02 Natl Inst For Res In Inorg Mater Tip process for thermion radiation cathodes
JPS5451470A (en) * 1977-09-30 1979-04-23 Denki Kagaku Kogyo Kk Method of producing lanthanum hexaboride hottcathode
JPS5588233A (en) * 1978-12-26 1980-07-03 Denki Kagaku Kogyo Kk Hexaboride single crystal cathode

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51126030A (en) * 1975-04-24 1976-11-02 Natl Inst For Res In Inorg Mater Tip process for thermion radiation cathodes
JPS5451470A (en) * 1977-09-30 1979-04-23 Denki Kagaku Kogyo Kk Method of producing lanthanum hexaboride hottcathode
JPS5588233A (en) * 1978-12-26 1980-07-03 Denki Kagaku Kogyo Kk Hexaboride single crystal cathode

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2389450A (en) * 2001-10-30 2003-12-10 York Electron Optics Ltd Electron source
JP2013134874A (en) * 2011-12-26 2013-07-08 National Institute For Materials Science Filament and method for manufacturing the same

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