GB1136139A - Improvements in filamentary cathodes - Google Patents

Improvements in filamentary cathodes

Info

Publication number
GB1136139A
GB1136139A GB32662/66A GB3266266A GB1136139A GB 1136139 A GB1136139 A GB 1136139A GB 32662/66 A GB32662/66 A GB 32662/66A GB 3266266 A GB3266266 A GB 3266266A GB 1136139 A GB1136139 A GB 1136139A
Authority
GB
United Kingdom
Prior art keywords
cathode
plates
portions
july
rods
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
GB32662/66A
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.)
Compagnie Francaise Thomson Houston SA
Original Assignee
Compagnie Francaise Thomson Houston SA
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 Compagnie Francaise Thomson Houston SA filed Critical Compagnie Francaise Thomson Houston SA
Publication of GB1136139A publication Critical patent/GB1136139A/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
    • H01J1/18—Supports; Vibration-damping arrangements

Landscapes

  • Solid Thermionic Cathode (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)

Abstract

1,136,139. Thermionic cathode constructions. COMPAGNIE FRANCAISE THOMSON HOUSTON - HOTCHKISS BRANDT. 20 July, 1966 [20 July, 1965], No. 32662/66. Heading H1D. A filamentary cathode for high power electronic tubes comprises at least two coaxial tubular portions of metal mesh each formed of two helically wound layers of wire, the ends of each portion being fixed to the edges of circular plates spaced axially by a distance less than their diameter. The cathode comprises a single tube of thoriated W wire mesh having Mo end plates 2, 3 and is divided into portions 30 by intermediate plates 4, 5. Pairs of rods 6, 7 attached to end plates 2, 3 respectively support the cathode and act as current conductors. Rods 6 are clamped to but insulated from plates 4, 5 by ceramic discs 8 and nuts 9. The cathode may comprise two separate portions connected to intermediate dished plates joined together and supported by two or three coaxial tubes which may be slotted to aid cooling. Current may be passed in series or parallel through the two portions using additional conductors in the latter case. In an electronic tube having a metal-ceramic envelope the cathode is surrounded by a control grid reinforced by a rigid ring which assists cooling of the grid wires.
GB32662/66A 1965-07-20 1966-07-20 Improvements in filamentary cathodes Expired GB1136139A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR25295A FR1455956A (en) 1965-07-20 1965-07-20 Direct heating cathode improvements

Publications (1)

Publication Number Publication Date
GB1136139A true GB1136139A (en) 1968-12-11

Family

ID=8584862

Family Applications (1)

Application Number Title Priority Date Filing Date
GB32662/66A Expired GB1136139A (en) 1965-07-20 1966-07-20 Improvements in filamentary cathodes

Country Status (4)

Country Link
US (1) US3449616A (en)
CH (1) CH443495A (en)
FR (1) FR1455956A (en)
GB (1) GB1136139A (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3560791A (en) * 1967-09-08 1971-02-02 Siemens Ag Mesh cathode for electron tubes
US3737711A (en) * 1968-11-21 1973-06-05 Varian Associates Electron tube having an improved filamentary cathode and support therefor and method of making same
CH549283A (en) * 1972-09-06 1974-05-15 Bbc Brown Boveri & Cie MESH CATHODE FOR ELECTRON TUBES.
FR2255697B1 (en) * 1973-12-21 1977-08-12 Thomson Csf
US3976909A (en) * 1975-07-11 1976-08-24 Rca Corporation Wire mesh cathode
SU1042105A1 (en) * 1980-02-05 1983-09-15 Организация П/Я Х-5263 Grid-type filamentary cathode for vacuum tubes and its manufacture method
EP0101108B1 (en) * 1982-07-27 1987-01-21 BBC Aktiengesellschaft Brown, Boveri & Cie. Electronic tube, particularly an emitter tube
FR2708379B1 (en) * 1993-07-27 1995-09-01 Thomson Tubes Electroniques Cathode with rapid switching on and off of the heating and electronic grid tube comprising such a cathode.

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2456649A (en) * 1943-06-12 1948-12-21 Glenn F Rouse Cathode
BE484368A (en) * 1947-08-15
FR1053139A (en) * 1952-03-28 1954-02-01 Thomson Houston Comp Francaise Improvements to thermionic cathodes
NL88786C (en) * 1955-04-02
GB874631A (en) * 1958-07-01 1961-08-10 Siemens Ag Improvements relating to cathodes for electronic valves
US3172002A (en) * 1960-11-21 1965-03-02 Rca Corp Cathode mount and method of fabrication
GB987461A (en) * 1962-05-31 1965-03-31 Standard Telephones Cables Ltd Thermionic valves

Also Published As

Publication number Publication date
US3449616A (en) 1969-06-10
CH443495A (en) 1967-09-15
FR1455956A (en) 1966-05-20

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