GB1174371A - Mesh Electrodes for Electron Tubes and Method of Making Same. - Google Patents

Mesh Electrodes for Electron Tubes and Method of Making Same.

Info

Publication number
GB1174371A
GB1174371A GB1156668A GB1156668A GB1174371A GB 1174371 A GB1174371 A GB 1174371A GB 1156668 A GB1156668 A GB 1156668A GB 1156668 A GB1156668 A GB 1156668A GB 1174371 A GB1174371 A GB 1174371A
Authority
GB
United Kingdom
Prior art keywords
wire
mandrel
mesh
cathode
molybdenum
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
GB1156668A
Inventor
James Paul Polese
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.)
Varian Medical Systems Inc
Original Assignee
Varian Associates Inc
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 Varian Associates Inc filed Critical Varian Associates Inc
Priority to CH348668A priority Critical patent/CH468074A/en
Priority to GB1156668A priority patent/GB1174371A/en
Publication of GB1174371A publication Critical patent/GB1174371A/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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J19/00—Details of vacuum tubes of the types covered by group H01J21/00
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0001—Electrodes and electrode systems suitable for discharge tubes or lamps
    • H01J2893/0012—Constructional arrangements
    • H01J2893/0015—Non-sealed electrodes
    • H01J2893/0017—Cylindrical, helical or annular grids
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0001—Electrodes and electrode systems suitable for discharge tubes or lamps
    • H01J2893/0012—Constructional arrangements
    • H01J2893/0019—Chemical composition and manufacture
    • H01J2893/0022—Manufacture
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0001—Electrodes and electrode systems suitable for discharge tubes or lamps
    • H01J2893/0012—Constructional arrangements
    • H01J2893/0019—Chemical composition and manufacture
    • H01J2893/0022—Manufacture
    • H01J2893/0025—Manufacture by winding wire upon a support

Abstract

1,174,371. Welding by pressure. VARIAN ASSOCIATES. 8 March, 1968, No. 11566/68. Heading B3R. [Also in Division H1] In making a tubular electrode of wire mesh for an electron tube a tubular mesh is formed by winding a wire comprising a refractory core coated with a metal of lower melting point about a mandrel, the wire having a coefficient of expansion lower than that of the mandrel and heating the assembly to a temperature at which sufficient pressure is produced by differential expansion of the mandrel and wire to cause the wire to wire contacts to weld, the temperature being below that at which the metal coating on the wire melts. A wire 18, of tungsten clad with nickel for a cathode or of molybdenum clad with gold for a grid, is helically wound about the enlarged portion 30 of a high alumina ceramic mandrel 20 and is wound over end rings 12, 14 of molybdenum plated with nickel for a cathode and with gold for a grid, arranged on the portion 30, to form a tubular mesh 16. When the mesh is formed the mandrel is removed from the wire-winding machine and a clamp formed by three part cylindrical sections 24 of ceramic and molybdenum tieing wire 25 is secured about the mandrel. The assembly is heated in a wet hydrogen atmosphere furnace to 1030‹ C. for 20 minutes when due to increased expansion of the mandrel and the clamping action of the sections 24 and wire 25 the wire to wire and wire to ring contacts weld. If the electrode is to form a cathode it is provided after removal from the mandrel with electron emissive material, e.g. barium oxide, strontium oxide or calcium oxide. The ring 12 may be replaced by an annular washer in a plane at right angles to the axis of the mesh and an annular clamp may be screwed to the mandrel to overlap the washer. A wire-mesh screen formed by the wire 18 may partially close one end of the electrode.
GB1156668A 1968-03-08 1968-03-08 Mesh Electrodes for Electron Tubes and Method of Making Same. Expired GB1174371A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CH348668A CH468074A (en) 1968-03-08 1968-03-08 Method of manufacturing a cylindrical electrode for an electron tube and an electrode obtained by this method
GB1156668A GB1174371A (en) 1968-03-08 1968-03-08 Mesh Electrodes for Electron Tubes and Method of Making Same.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1156668A GB1174371A (en) 1968-03-08 1968-03-08 Mesh Electrodes for Electron Tubes and Method of Making Same.

Publications (1)

Publication Number Publication Date
GB1174371A true GB1174371A (en) 1969-12-17

Family

ID=9988597

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1156668A Expired GB1174371A (en) 1968-03-08 1968-03-08 Mesh Electrodes for Electron Tubes and Method of Making Same.

Country Status (2)

Country Link
CH (1) CH468074A (en)
GB (1) GB1174371A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023056992A1 (en) * 2021-10-04 2023-04-13 Západoceska Univerzita V Plzni Power tube grid and method of its production

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023056992A1 (en) * 2021-10-04 2023-04-13 Západoceska Univerzita V Plzni Power tube grid and method of its production

Also Published As

Publication number Publication date
CH468074A (en) 1969-01-31

Similar Documents

Publication Publication Date Title
US2333622A (en) Method of uniting dissimilar materials and the product thereof
US4066928A (en) Resonant cavity magnetron having a helical cathode
US2177703A (en) Electric gaseous discharge device
GB1174371A (en) Mesh Electrodes for Electron Tubes and Method of Making Same.
US2497110A (en) Method of making electrodes
US1870968A (en) Heater element
US2404157A (en) Method of bonding structures
US3736458A (en) Filamentary electrode and fabrication thereof
US2165135A (en) Wire electrode
US2014539A (en) Electron tube
US1981245A (en) Space-current device
US2067129A (en) Cathode for discharge devices
US2443632A (en) Braid shielding
US3294125A (en) Electrode coil and method
US1975870A (en) Indirectly heated cathode
US2589521A (en) Heater
US3355619A (en) Incandescent lamp
US2693546A (en) Electron emitter for electron tubes
US3465400A (en) Method of making cylindrical mesh electrode for electron tubes
US2171238A (en) Discharge device and electrode
US2513387A (en) Grid electrode
US1733504A (en) Vacuum tube
US2482826A (en) Filament structure for thermionic tubes
US3404442A (en) Method of fabricating directly heated cathode
US3854180A (en) Method of connecting a filament to a support in an electric filament lamp

Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees