JPS5671237A - Electron gun - Google Patents

Electron gun

Info

Publication number
JPS5671237A
JPS5671237A JP14732079A JP14732079A JPS5671237A JP S5671237 A JPS5671237 A JP S5671237A JP 14732079 A JP14732079 A JP 14732079A JP 14732079 A JP14732079 A JP 14732079A JP S5671237 A JPS5671237 A JP S5671237A
Authority
JP
Japan
Prior art keywords
heat generating
thin film
generating member
permeation
diffusion
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
JP14732079A
Other languages
Japanese (ja)
Inventor
Kakuki Motoyama
Tadahiro Takigawa
Takashi Meguro
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.)
Toshiba Corp
Shibaura Machine Co Ltd
Original Assignee
Toshiba Corp
Toshiba Machine Co Ltd
Tokyo Shibaura Electric Co 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 Toshiba Corp, Toshiba Machine Co Ltd, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP14732079A priority Critical patent/JPS5671237A/en
Publication of JPS5671237A publication Critical patent/JPS5671237A/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

Landscapes

  • Electron Sources, Ion Sources (AREA)
  • Solid Thermionic Cathode (AREA)

Abstract

PURPOSE:To prevent the resistance of heat generating member from changing as time elapses, by coating the exposed face of electrical heat generating member with thin film by blocking the diffusion and the permeation of lanthanum and boron. CONSTITUTION:A relatively low temperature region on an exposed face of electrical heat generating members 2a, 2b is coated with a thin film 21a of carbon, metal carbide, metal boride, nitrogen boride or such material as not react with La, B, while the region on the heat generating members 2a, 2b contacting with the cathode 1 is also coated with thin film 21b of said material. Consequently the diffusion and the permeation of La, B into the heat generating member can be blocked and the resistance can be prevented from changing as the time elapses resulting in electron current stable for long time.
JP14732079A 1979-11-14 1979-11-14 Electron gun Pending JPS5671237A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14732079A JPS5671237A (en) 1979-11-14 1979-11-14 Electron gun

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14732079A JPS5671237A (en) 1979-11-14 1979-11-14 Electron gun

Publications (1)

Publication Number Publication Date
JPS5671237A true JPS5671237A (en) 1981-06-13

Family

ID=15427510

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14732079A Pending JPS5671237A (en) 1979-11-14 1979-11-14 Electron gun

Country Status (1)

Country Link
JP (1) JPS5671237A (en)

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