EP0220396A1 - Cathodes à chauffage indirect du type à réserve pour enceintes de décharge électriques - Google Patents

Cathodes à chauffage indirect du type à réserve pour enceintes de décharge électriques Download PDF

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Publication number
EP0220396A1
EP0220396A1 EP86110820A EP86110820A EP0220396A1 EP 0220396 A1 EP0220396 A1 EP 0220396A1 EP 86110820 A EP86110820 A EP 86110820A EP 86110820 A EP86110820 A EP 86110820A EP 0220396 A1 EP0220396 A1 EP 0220396A1
Authority
EP
European Patent Office
Prior art keywords
cathode
heater
sleeve
indirectly heated
cartridge
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
EP86110820A
Other languages
German (de)
English (en)
Other versions
EP0220396B1 (fr
Inventor
Erwin Dr. rer. nat. Hübner
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP0220396A1 publication Critical patent/EP0220396A1/fr
Application granted granted Critical
Publication of EP0220396B1 publication Critical patent/EP0220396B1/fr
Expired legal-status Critical Current

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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

Definitions

  • the invention relates to a supply cathode according to the preamble of patent claim 1.
  • Cathodes for electrical discharge vessels in which emission substances from an emission substance supply through fine openings of a porous emission substance carrier covering them, made of in particular porous sintered high-melting metal, such as e.g. Tungsten, migrate to the cathode surface and in which the supply of barium in operation consists of barium oxide, are known, for example, from DE-PS 12 17 503.
  • Cathodes of the type described are largely used today, among other things, in traveling wave tubes and disc tubes and work to full satisfaction.
  • one end of the heater is often soldered to the cathode cartridge at the same time as the cathode sleeve for heat-economic reasons.
  • the cathode sleeve has a notch where the cartridge, heater and sleeve are soldered at the same time.
  • the object of the present invention is to avoid wire embrittlement in a supply cathode and a heater breakage resulting therefrom under mechanical loads (thermal movements).
  • the main advantage of the proposed supply cathode is that the measure according to the invention, instead of providing a notch for providing a window in the cathode sleeve, which is preferably introduced about 1.5 mm below the edge of the cathode sleeve, ensures that the capillary action between the cathode sleeve and cathode cartridge, seen over the circumference, is no longer disturbed at any point and the solder is thus preferably held in this zone. It is therefore not possible to pull the solder up to the kink of the heating coil due to capillary forces between the cathode cartridge and the adjacent heater end, since there is no fear of excess solder at this point. The solder flow and heater bend can also be checked through the window.
  • the known supply cathode shown in FIG. 1 essentially consists of an emission carrier disk 8, which at the end covers a cathode cartridge 3 attached to a fastening ring 6 made of molybdenum.
  • the cathode cartridge 3 has an outwardly widened gradation on the end face and contains the supply of emissions.
  • the cathode cartridge 3 is surrounded by a helical heater 1, which is preferably operated with direct current.
  • the cathode cartridge 3 is arranged coaxially in a cathode sleeve 2, which is hollow-cylindrical.
  • the cathode sleeve 2 On the face side, the cathode sleeve 2 is provided with a notch 5, in the area of which the end of the heater 1 which has a kink 4 is soldered to the gradation of the cathode cartridge 3 and the cathode sleeve 2.
  • the cathode sleeve 2 is simultaneously fastened to the fastening ring 6 via the solder layer 7.
  • the cathode cartridge 3 is extended upwards towards the emission carrier plate 8 by a gradation and preferably contains barium oxide as the emission agent supply.
  • the cathode cartridge 3 is surrounded by a helical heater 1, which is preferably heated with direct current.
  • the cathode cartridge 3 is arranged coaxially in a cathode sleeve 2 made of tantalum or molybdenum, which is designed as a hollow cylinder.
  • the cathode sleeve 2 In its upper end area - preferably approximately 1.5 mm below the edge - the cathode sleeve 2 is provided with a recess 5 in the form of a window, in the area of which the end of the heater 1 with a kink 4 with the gradation of the cathode cartridge 3 and the cathode sleeve 2 is soldered.
  • the simultaneous soldering of the cathode sleeve to the fastening ring 6 takes place via the solder layer 7, which preferably consists of platinum solder.

Landscapes

  • Electron Sources, Ion Sources (AREA)
  • Solid Thermionic Cathode (AREA)
EP86110820A 1985-09-27 1986-08-05 Cathodes à chauffage indirect du type à réserve pour enceintes de décharge électriques Expired EP0220396B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3534553 1985-09-27
DE3534553 1985-09-27

Publications (2)

Publication Number Publication Date
EP0220396A1 true EP0220396A1 (fr) 1987-05-06
EP0220396B1 EP0220396B1 (fr) 1989-11-02

Family

ID=6282154

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86110820A Expired EP0220396B1 (fr) 1985-09-27 1986-08-05 Cathodes à chauffage indirect du type à réserve pour enceintes de décharge électriques

Country Status (2)

Country Link
EP (1) EP0220396B1 (fr)
DE (1) DE3666750D1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2735902A1 (fr) * 1995-06-21 1996-12-27 Samsung Display Devices Co Ltd Support de cathode d'un canon a electrons pour tubes cathodiques
EP0851453A1 (fr) * 1996-12-31 1998-07-01 Eaton Corporation Capuchon d'extrémité pour cathode à chauffage indirect dans une source d'ions

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105788998B (zh) * 2016-04-19 2017-11-21 北京航空航天大学 一种小尺寸、小功率钡钨空心阴极

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, unexamined applications, Sektion E, Band 4, Nr. 121, 27. August, 1980 THE PATENT OFFICE JAPANESE GOVERNMENT Seite 81 E 23 * JP - A - 55-76 551 * *
PATENT ABSTRACTS OF JAPAN, unexamined applications, Sektion E, Band 4, Nr. 8, 22. Janner 1980 THE PATENT OFFICE JAPANESE GOVERNMENT Seite 78 E 166 * JP - A - 54-147 371 * *
PATENT ABSTRACTS OF JAPAN, unexamined applications, Sektion E, Band 5, Nr. 44, 24. Marz 1981 THE PATENT OFFICE JAPANESE GOVERNMENT Seite 77 E 50 * JP - A - 55-166 845 * *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2735902A1 (fr) * 1995-06-21 1996-12-27 Samsung Display Devices Co Ltd Support de cathode d'un canon a electrons pour tubes cathodiques
EP0851453A1 (fr) * 1996-12-31 1998-07-01 Eaton Corporation Capuchon d'extrémité pour cathode à chauffage indirect dans une source d'ions

Also Published As

Publication number Publication date
DE3666750D1 (en) 1989-12-07
EP0220396B1 (fr) 1989-11-02

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