GB982206A - Thermionic cathodes - Google Patents

Thermionic cathodes

Info

Publication number
GB982206A
GB982206A GB41420/62A GB4142062A GB982206A GB 982206 A GB982206 A GB 982206A GB 41420/62 A GB41420/62 A GB 41420/62A GB 4142062 A GB4142062 A GB 4142062A GB 982206 A GB982206 A GB 982206A
Authority
GB
United Kingdom
Prior art keywords
strands
coil
helix
larger
cathode
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
GB41420/62A
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
Publication of GB982206A publication Critical patent/GB982206A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
    • H01J23/02—Electrodes; Magnetic control means; Screens
    • H01J23/04—Cathodes
    • H01J23/05—Cathodes having a cylindrical emissive surface, e.g. cathodes for magnetrons
    • 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
    • H01J1/22—Heaters
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
    • H01J23/02—Electrodes; Magnetic control means; Screens
    • H01J23/04—Cathodes

Landscapes

  • Microwave Tubes (AREA)
  • Solid Thermionic Cathode (AREA)

Abstract

982,206. Thermionic cathodes. VARIAN ASSOCIATES. Nov. 1, 1962 [Nov. 29, 1961], No. 41420/62. Heading H1D. [Also in Division H5] A cathode heater comprises two wire strands 32, 33, Fig. 4a, wound to form a bifilar helical coil, which coil is then formed into a larger coil. Current is passed in opposite directions in the two strands so that magnetic fields set up by the currents in the two strands substantially neutralize one another. As shown, the two strands of the bifilar helix are connected in series by a turn 34 arranged in a plane perpendicular to the cathode surface 36. Alternatively, the two strands may be connected in parallel, the two ends 42, 43, Fig. 13, being passed down the centre of the larger helix 41. Instead of being formed into a larger helix, the bifilar helical coil may be wound into a flat coil, e.g. a single or double spiral or a zig-zag pancake coil. The cathode may be used in klystrons, travelling-wave tubes or magnetrons.
GB41420/62A 1961-11-29 1962-11-01 Thermionic cathodes Expired GB982206A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US155565A US3255375A (en) 1961-11-29 1961-11-29 Electrical heating device

Publications (1)

Publication Number Publication Date
GB982206A true GB982206A (en) 1965-02-03

Family

ID=22555935

Family Applications (1)

Application Number Title Priority Date Filing Date
GB41420/62A Expired GB982206A (en) 1961-11-29 1962-11-01 Thermionic cathodes

Country Status (3)

Country Link
US (1) US3255375A (en)
DE (1) DE1181825B (en)
GB (1) GB982206A (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4176293A (en) * 1978-02-17 1979-11-27 Varian Associates, Inc. Thermionic cathode heater having reduced magnetic field
DE2938248A1 (en) * 1979-09-21 1981-03-26 Standard Elektrik Lorenz AG, 70435 Stuttgart HEATING ELEMENT FOR AN INDIRECTLY HEATED CATHODE
USRE32918E (en) * 1983-03-11 1989-05-09 Technion, Inc. Heater/emitter assembly
US4569198A (en) * 1983-03-11 1986-02-11 Technion, Incorporated Heater/emitter assembly
DE3500832A1 (en) * 1985-01-12 1986-07-24 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Toroidal heating element
JPS6255833A (en) * 1985-09-04 1987-03-11 Hitachi Ltd Heater for indirectly-heated cathode
GB2192751B (en) * 1986-07-14 1991-02-13 Denki Kagaku Kogyo Kk Method of making a thermionic cathode structure.
DE4420607A1 (en) * 1994-06-13 1995-12-14 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Electric incandescent lamp and filament for incandescent lamps
CN111699539A (en) * 2019-12-23 2020-09-22 深圳联影医疗科技有限公司 Radiotherapy equipment and microwave source thereof

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1797990A (en) * 1926-02-06 1931-03-24 Arsene N Lucian Heater construction for cathodes
US1865442A (en) * 1930-01-28 1932-07-05 Westinghouse Lamp Co Method of manufacturing noninductive helical filaments
CH184974A (en) * 1934-04-17 1936-06-30 Philips Nv Activated hot cathode with a wire core wound in a helical manner with thin metal wire to hold the emitting substances in place.
US2406850A (en) * 1941-04-11 1946-09-03 Bell Telephone Labor Inc Electron discharge apparatus
US2394474A (en) * 1944-12-28 1946-02-05 Gen Electric Coiled filament or cathode and its manufacture
US3003077A (en) * 1953-07-10 1961-10-03 Sylvania Electric Prod Discharge lamp cathode
US2922916A (en) * 1953-11-10 1960-01-26 Duro Test Corp Electrode for fluorescent lamps
FR1273216A (en) * 1960-11-09 1961-10-06 Ass Elect Ind Improvements to indirectly heated cathodes for electron tubes

Also Published As

Publication number Publication date
US3255375A (en) 1966-06-07
DE1181825B (en) 1964-11-19

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