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JPS56103841A - Direct heated oxide cathode and its manufacture - Google Patents

Direct heated oxide cathode and its manufacture

Info

Publication number
JPS56103841A
JPS56103841A JP567280A JP567280A JPS56103841A JP S56103841 A JPS56103841 A JP S56103841A JP 567280 A JP567280 A JP 567280A JP 567280 A JP567280 A JP 567280A JP S56103841 A JPS56103841 A JP S56103841A
Authority
JP
Japan
Prior art keywords
powder
oxide layer
manufacture
oxide cathode
direct heated
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
JP567280A
Other languages
Japanese (ja)
Inventor
Seiji Kumada
Akira Misumi
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP567280A priority Critical patent/JPS56103841A/en
Priority to GB8029361A priority patent/GB2059676B/en
Priority to US06/186,742 priority patent/US4446404A/en
Publication of JPS56103841A publication Critical patent/JPS56103841A/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
    • H01J1/14—Solid thermionic cathodes characterised by the material

Landscapes

  • Solid Thermionic Cathode (AREA)

Abstract

PURPOSE:To reliably fix the oxide layer and prevent its peeling, by simultaneously coating Ni powder and Co powder having the grain size smaller than that of Ni powder and burning the coat. CONSTITUTION:Ni powder or an alloy powder 4 mainly composed of Ni is coated together with Co powder having the grain size smaller than that of Ni powder between a base metal 1 and an alkali earth metal oxide layer 3, then it is burnt to provide a formed layer. Consequently the diffusion of an activator or Zr into Ni particles is suppressed, thereby the deformation of Ni particles will never occur, thus preventing possible peeling of the oxide layer 3.
JP567280A 1979-09-12 1980-01-23 Direct heated oxide cathode and its manufacture Pending JPS56103841A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP567280A JPS56103841A (en) 1980-01-23 1980-01-23 Direct heated oxide cathode and its manufacture
GB8029361A GB2059676B (en) 1979-09-12 1980-09-11 Oxide-coated cathodes
US06/186,742 US4446404A (en) 1979-09-12 1980-09-12 Directly heated oxide cathode and production thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP567280A JPS56103841A (en) 1980-01-23 1980-01-23 Direct heated oxide cathode and its manufacture

Publications (1)

Publication Number Publication Date
JPS56103841A true JPS56103841A (en) 1981-08-19

Family

ID=11617585

Family Applications (1)

Application Number Title Priority Date Filing Date
JP567280A Pending JPS56103841A (en) 1979-09-12 1980-01-23 Direct heated oxide cathode and its manufacture

Country Status (1)

Country Link
JP (1) JPS56103841A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS536560A (en) * 1976-07-07 1978-01-21 Hitachi Ltd Manufacture of cathode for direct heating type cathode ray tube

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS536560A (en) * 1976-07-07 1978-01-21 Hitachi Ltd Manufacture of cathode for direct heating type cathode ray tube

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