GB830352A - Improvements in or relating to the mounting of thermionic cathodes - Google Patents

Improvements in or relating to the mounting of thermionic cathodes

Info

Publication number
GB830352A
GB830352A GB23986/56A GB2398656A GB830352A GB 830352 A GB830352 A GB 830352A GB 23986/56 A GB23986/56 A GB 23986/56A GB 2398656 A GB2398656 A GB 2398656A GB 830352 A GB830352 A GB 830352A
Authority
GB
United Kingdom
Prior art keywords
secured
ring
cathode
filament wires
wires
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.)
Expired
Application number
GB23986/56A
Inventor
George Albert Morton
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB830352A publication Critical patent/GB830352A/en
Expired 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

  • Microwave Tubes (AREA)
  • Electron Sources, Ion Sources (AREA)

Abstract

830,352. Thermionic-cathode tubes. STANDARD TELEPHONES & CABLES Ltd. Aug. 3, 1956, No. 23986/56. Class 39(1). A filamentary thermionic cathode for use in higher power valves comprises a set of filament wires 3, lying on the surface of an imaginary cylinder, welded at one end to a metal ring 1 which is attached by means of a set of flexible metal tapes 7 and a flange 6 to a coaxial current lead 5. This arrangement allows for axial and radial relative movement between the cathode and the lead 5. As shown the filament wires of tungsten or thoriated tungsten are arranged as a reticulated grid welded together at each cross-over 4, but the wires may form a squirrel cage. The current lead 5 is a hollow cylindrical or frusto-conical tube of molybdenum sheet, to the upper end of which is secured the skirted support flange 6. To allow for differential radial thermal expansion between the filament wires and the current lead the tapes are provided with crimped portions 8. At their lower ends the filament wires are welded to a tantalum or molybdenum ring 2. A disc 9 is secured to the lower end of the tube 5 and an annular dish 10 is secured inside the ring 2, so that the cathode structure may be mounted on a pair of rods 11 secured respectively to the disc 9 and dish 10. Alternatively, coaxial tubes may be secured to the ring 2 and tube 5 to provide a coaxial stem construction for base connections and supporting means.
GB23986/56A 1956-08-03 1956-08-03 Improvements in or relating to the mounting of thermionic cathodes Expired GB830352A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB352411X 1956-08-03

Publications (1)

Publication Number Publication Date
GB830352A true GB830352A (en) 1960-03-16

Family

ID=10375472

Family Applications (1)

Application Number Title Priority Date Filing Date
GB23986/56A Expired GB830352A (en) 1956-08-03 1956-08-03 Improvements in or relating to the mounting of thermionic cathodes

Country Status (2)

Country Link
CH (1) CH352411A (en)
GB (1) GB830352A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7202069A (en) * 1972-02-17 1973-08-21

Also Published As

Publication number Publication date
CH352411A (en) 1961-02-28

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