EP0421372A3 - Electron tube cathode and method of its manufacture - Google Patents

Electron tube cathode and method of its manufacture Download PDF

Info

Publication number
EP0421372A3
EP0421372A3 EP19900118910 EP90118910A EP0421372A3 EP 0421372 A3 EP0421372 A3 EP 0421372A3 EP 19900118910 EP19900118910 EP 19900118910 EP 90118910 A EP90118910 A EP 90118910A EP 0421372 A3 EP0421372 A3 EP 0421372A3
Authority
EP
European Patent Office
Prior art keywords
manufacture
electron tube
tube cathode
cathode
electron
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.)
Granted
Application number
EP19900118910
Other versions
EP0421372B1 (en
EP0421372A2 (en
Inventor
Hisao C/O Mitsubishi Denki K.K. Nakanishi
Kinjiro C/O Mitsubishi Denki K.K. Sano
Toyokazu C/O Mitsubishi Denki K.K. Kamata
Takashi C/O Mitsubishi Denki K.K. Shinjo
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Publication of EP0421372A2 publication Critical patent/EP0421372A2/en
Publication of EP0421372A3 publication Critical patent/EP0421372A3/en
Application granted granted Critical
Publication of EP0421372B1 publication Critical patent/EP0421372B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • H01J1/20—Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment
    • H01J1/28—Dispenser-type cathodes, e.g. L-cathode
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/02—Manufacture of electrodes or electrode systems
    • H01J9/04—Manufacture of electrodes or electrode systems of thermionic cathodes
    • H01J9/042—Manufacture, activation of the emissive part

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Solid Thermionic Cathode (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)
EP90118910A 1989-10-06 1990-10-03 Method of manufacturing an electrode tube cathode Expired - Lifetime EP0421372B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP26236889A JPH0828183B2 (en) 1989-10-06 1989-10-06 Electron tube cathode
JP262368/89 1989-10-06

Publications (3)

Publication Number Publication Date
EP0421372A2 EP0421372A2 (en) 1991-04-10
EP0421372A3 true EP0421372A3 (en) 1991-11-21
EP0421372B1 EP0421372B1 (en) 1994-09-14

Family

ID=17374773

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90118910A Expired - Lifetime EP0421372B1 (en) 1989-10-06 1990-10-03 Method of manufacturing an electrode tube cathode

Country Status (4)

Country Link
EP (1) EP0421372B1 (en)
JP (1) JPH0828183B2 (en)
KR (1) KR940009756B1 (en)
DE (1) DE69012494T2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR930003229Y1 (en) * 1991-04-30 1993-06-03 주식회사 금성사 Heater structure of electronic gun for heat radiating type for crt tube
KR100449759B1 (en) * 2002-03-21 2004-09-22 삼성에스디아이 주식회사 Cathode for electron tube and preparing method thereof

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2726178A (en) * 1950-11-17 1955-12-06 Rca Corp Thermionic cathode with thoria coating
US4411827A (en) * 1981-03-18 1983-10-25 Corneille David M Coprecipitation process for thermionic cathode type materials
EP0204477A1 (en) * 1985-05-25 1986-12-10 Mitsubishi Denki Kabushiki Kaisha Cathode for electron tube and manufacturing method thereof
EP0327074A2 (en) * 1988-02-02 1989-08-09 Mitsubishi Denki Kabushiki Kaisha Cathode for a cathode ray tube

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6222347A (en) * 1985-07-19 1987-01-30 Mitsubishi Electric Corp Cathode for electron tube

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2726178A (en) * 1950-11-17 1955-12-06 Rca Corp Thermionic cathode with thoria coating
US4411827A (en) * 1981-03-18 1983-10-25 Corneille David M Coprecipitation process for thermionic cathode type materials
EP0204477A1 (en) * 1985-05-25 1986-12-10 Mitsubishi Denki Kabushiki Kaisha Cathode for electron tube and manufacturing method thereof
EP0327074A2 (en) * 1988-02-02 1989-08-09 Mitsubishi Denki Kabushiki Kaisha Cathode for a cathode ray tube

Also Published As

Publication number Publication date
EP0421372B1 (en) 1994-09-14
EP0421372A2 (en) 1991-04-10
JPH03127427A (en) 1991-05-30
DE69012494T2 (en) 1995-01-26
JPH0828183B2 (en) 1996-03-21
KR940009756B1 (en) 1994-10-17
KR910008766A (en) 1991-05-31
DE69012494D1 (en) 1994-10-20

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