JPS56141138A - Indirectly heated cathode - Google Patents

Indirectly heated cathode

Info

Publication number
JPS56141138A
JPS56141138A JP4333280A JP4333280A JPS56141138A JP S56141138 A JPS56141138 A JP S56141138A JP 4333280 A JP4333280 A JP 4333280A JP 4333280 A JP4333280 A JP 4333280A JP S56141138 A JPS56141138 A JP S56141138A
Authority
JP
Japan
Prior art keywords
heater
fit
coil
conical coil
sleeve
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
JP4333280A
Other languages
Japanese (ja)
Inventor
Fumiaki Kitano
Michihiko Tominaga
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP4333280A priority Critical patent/JPS56141138A/en
Publication of JPS56141138A publication Critical patent/JPS56141138A/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
    • H01J1/20—Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment
    • H01J1/24—Insulating layer or body located between heater and emissive material

Landscapes

  • Powder Metallurgy (AREA)
  • Solid Thermionic Cathode (AREA)

Abstract

PURPOSE:To prevent a potted heater from being subjected to damages such as cut- out, crack, deformation, etc. by laying a heater coil in the internal space of a conical coil made of a high melting point metallic wire using sintered powder aggregate and fit-inserting the conical coil in a cathode sleeve. CONSTITUTION:An alumina coated heater coil 1 is inserted in a conical coil 4 around which a molybdenum wire is tightly wound. 900-mesh alumina powder 2 is filled up in the space using the 1% aluminum nitrate aqueous solution as binder and sintered in the hydrogen atmosphere at 1,650 deg.C for five minutes. It is degassed in vacuum by electric heating and fit-inserted in a cathode sleeve 3. This can prevent a potted heater from being subjected to damages, such as cut-out, crack, deformation, etc. when an indirectly heated cathode is fit-inserted in its sleeve since its circumference consists of the metallic conical coil.
JP4333280A 1980-04-02 1980-04-02 Indirectly heated cathode Pending JPS56141138A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4333280A JPS56141138A (en) 1980-04-02 1980-04-02 Indirectly heated cathode

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4333280A JPS56141138A (en) 1980-04-02 1980-04-02 Indirectly heated cathode

Publications (1)

Publication Number Publication Date
JPS56141138A true JPS56141138A (en) 1981-11-04

Family

ID=12660871

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4333280A Pending JPS56141138A (en) 1980-04-02 1980-04-02 Indirectly heated cathode

Country Status (1)

Country Link
JP (1) JPS56141138A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5159236A (en) * 1989-02-21 1992-10-27 Hamamatsu Photonics K.K. Indirectly heated cathode for a gas discharge tube
US5208508A (en) * 1991-09-16 1993-05-04 Raytheon Company Cathode heater potting assembly

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4827630U (en) * 1971-08-04 1973-04-03
JPS5232260B1 (en) * 1971-01-18 1977-08-20

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5232260B1 (en) * 1971-01-18 1977-08-20
JPS4827630U (en) * 1971-08-04 1973-04-03

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5159236A (en) * 1989-02-21 1992-10-27 Hamamatsu Photonics K.K. Indirectly heated cathode for a gas discharge tube
US5208508A (en) * 1991-09-16 1993-05-04 Raytheon Company Cathode heater potting assembly

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