US2513933A - Cold cathode magnetron - Google Patents

Cold cathode magnetron Download PDF

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Publication number
US2513933A
US2513933A US657716A US65771646A US2513933A US 2513933 A US2513933 A US 2513933A US 657716 A US657716 A US 657716A US 65771646 A US65771646 A US 65771646A US 2513933 A US2513933 A US 2513933A
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US
United States
Prior art keywords
cathode
anode
gap
members
magnetron
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 - Lifetime
Application number
US657716A
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English (en)
Inventor
Anatole M Gurewitsch
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.)
General Electric Co
Original Assignee
General Electric Co
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
Priority to BE474423D priority Critical patent/BE474423A/xx
Application filed by General Electric Co filed Critical General Electric Co
Priority to US657716A priority patent/US2513933A/en
Priority to FR943296D priority patent/FR943296A/fr
Priority to GB8492/47A priority patent/GB627343A/en
Application granted granted Critical
Publication of US2513933A publication Critical patent/US2513933A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01J1/30—Cold cathodes, e.g. field-emissive cathode
    • H01J1/304—Field-emissive cathodes
    • 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
    • H01J25/00—Transit-time tubes, e.g. klystrons, travelling-wave tubes, magnetrons
    • H01J25/50—Magnetrons, i.e. tubes with a magnet system producing an H-field crossing the E-field
    • H01J25/52—Magnetrons, i.e. tubes with a magnet system producing an H-field crossing the E-field with an electron space having a shape that does not prevent any electron from moving completely around the cathode or guide electrode
    • H01J25/58—Magnetrons, i.e. tubes with a magnet system producing an H-field crossing the E-field with an electron space having a shape that does not prevent any electron from moving completely around the cathode or guide electrode having a number of resonators; having a composite resonator, e.g. a helix
    • H01J25/587—Multi-cavity magnetrons

Definitions

  • the cold cathode requires no separate heatingv circuit, as does the'hot emission type, considerably simplifies tube manufacture and, operation. This feature, together with the fact that it generally requires no electron emissive coating, fa-
  • the cathode may be subjected to undesirable overheating and destruction by bombardment by. electrical particles within the; tube. Because of their generally more durable construction coldcathodes are more able to withstand such effects thereby lengthening the life of the tube and the cathode inoperation.
  • FIG. 1 represents a magnetron incorporate ingY the improved cathode of the invention
  • Fig, 2 represents a detailed View ofthe cathode
  • Fig. 3 represents a cross sectional View of the anode-cathode structure taken along the line l--I of Fig. 1.
  • the magnetron comprises the conventional elements including )an anodel I0 and permanent magnetic pole vpieces Il and l2'which supply the magnetic eldfor operation of the magnetron in thel well known manner.
  • Useful output power of the magnetron may be ⁇ taken from the output y'loop I3 inserted within one of the anode cavities I4 in the usual manner.
  • the entire ensemble including the novel cathode I5 to be hereinafter described, is supported in any suitable manner within an evacuated envelope I6 which may be of metal, glass, or any of the equivalent materials common in the art.
  • a potential difference between the anode and cathode may be imposed by any source of intermittent or continuous voltage such as the pulser circuit l1 which has its negative terminal connected to the cathode l5 and its positive terminal connected to the 5 Claims, (Cl. 256-27.5)
  • the cathode I5 comprises two generally cylindrical sections 23 and yZllhaving closed end por-V tio-ns 25 and 26, respectively, and juxtaposed open endsZland 28.
  • The. cathodeA sections, 23 and,l 24 are ccaxially mounted as shown andvmaintained in fixed spaced relation by means of the insu-A lator 29 which maintains electrical insulation,between the members 23 and. 24, at least as. re-
  • the. juxtaposed edges. ofthe openends 2l and 28 are so constructed asY toform sharpv or pointed surt faces which willrfacilitate the inductionwof Van electrical discharge, when a voltagev difference exists between the two sectionsl y23 and ,24.
  • the openends 21 andZil may be pro.
  • sharp edges or pointed surfaces create a high potentialvgradient inthe neighborhood of Vthe edge or point which gradient facilitatesthe initiationy of a discharge. It is to be understood, therefore, that. anyconstruction in which a series of sharp points are.
  • the cathode section 23 isconnected by lead-2
  • An electron discharge device comprising a cathode of the cold emission type comprising juxtaposed members electrically insulated from each other and forming a gap of high electric field intensity, an electrode in electron receiving relation to said cathode, means connected to said electrode and to one of said cathode members for applying an operating voltage between said electrode and one of said cathode members,
  • An electron discharge device comprising an anode and a cathode of the cold emission type comprising spaced cylindrical members e1ectri ⁇ cally insulated from each other and having juxtaposed sharp edges forming a gap of high electric field intensity, means connected to said anoderand one of said spaced cylindrical members for applying an operating volta-ge between said anode and one of said cathode members, a relatively high resistance connecting said anode to the other of said cathode members whereby said operating voltage is applied to said resistance and said gap in series to induce an electrical discharge at said gap.
  • An electron discharge device of the magnetron type comprising a cathode of the cold emission type comprising juxtaposed members electrically insulated from each other and forming a gap of high electric field intensity, an anode, a relatively highimpedance connecting said anode to one of said cathode members, and means connected to said anode and said other of said cathode members for imposing a positive potential upon said anode with respect to said cathode.
  • An electron discharge device of the magnetron type comprising a cathode of the cold emission type comprising juxtaposed members electrically insulated from each other and forming a gap of high electric eld intensity, an anode positioned kin electron receiving relation to said cathode, means connected to said anode and to one of said cathode rmembers for applying an operating'voltage between said anode and said one of said cathode members, a relatively high resistance connecting said anode to the other of saidr cathode members whereby said operating voltage is applied in said resistance and said gap in series to induce an electrical discharge at said gap.
  • An electron discharge device of the magnetron type comprising a cathode of the cold emission type comprising spaced coaxial cylindrical members electrically insulated from each other and having juxtaposed sharp edges forming a gap of high electric field intensity, an anode spaced from said cathode, means connected to said anode and to one 0f said cathode members for imposing a positive potential upon said anode with respect to said one of said cathode members, a relatively high resistance connecting said anode to the other of said cathode members whereby said positive potential is applied across said gap at the initial moment of operation to initiate an electrical discharge in said cathode.

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  • Microwave Tubes (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
US657716A 1946-03-28 1946-03-28 Cold cathode magnetron Expired - Lifetime US2513933A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
BE474423D BE474423A (it) 1946-03-28
US657716A US2513933A (en) 1946-03-28 1946-03-28 Cold cathode magnetron
FR943296D FR943296A (fr) 1946-03-28 1947-03-14 Magnétron à cathode froide
GB8492/47A GB627343A (en) 1946-03-28 1947-03-28 Improvements in and relating to electron discharge devices of the magnetron type

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US657716A US2513933A (en) 1946-03-28 1946-03-28 Cold cathode magnetron

Publications (1)

Publication Number Publication Date
US2513933A true US2513933A (en) 1950-07-04

Family

ID=24638380

Family Applications (1)

Application Number Title Priority Date Filing Date
US657716A Expired - Lifetime US2513933A (en) 1946-03-28 1946-03-28 Cold cathode magnetron

Country Status (4)

Country Link
US (1) US2513933A (it)
BE (1) BE474423A (it)
FR (1) FR943296A (it)
GB (1) GB627343A (it)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2633556A (en) * 1951-08-02 1953-03-31 Beverly D Kumpfer Millimeter wave generator
US2691758A (en) * 1951-01-26 1954-10-12 Israel R Senitzky Method of measuring pressure with a magnetron
US2782342A (en) * 1947-07-01 1957-02-19 Rca Corp Magnetron
US2813992A (en) * 1952-11-29 1957-11-19 Rca Corp Gas discharge device utilizing controlled electron trapping
US2869031A (en) * 1955-03-01 1959-01-13 Brett Herbert Cathode
US3091719A (en) * 1959-04-14 1963-05-28 Field Emission Corp Microwave transducer
US4104559A (en) * 1976-11-01 1978-08-01 Microwave Associates, Inc. Isopolar magnetron supported with rigid insulation in a remote housing
US5159241A (en) * 1990-10-25 1992-10-27 General Dynamics Corporation Air Defense Systems Division Single body relativistic magnetron
US5552672A (en) * 1993-09-03 1996-09-03 State Of Israel Ministry Of Defense, Armament Development Authority, Rafael Magnetron construction particularly useful as a relativistic magnetron
US6686696B2 (en) * 2001-03-08 2004-02-03 Genvac Aerospace Corporation Magnetron with diamond coated cathode

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2238903B (en) * 1989-12-08 1994-10-19 Eev Ltd Magnetrons

Citations (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1230004A (en) * 1915-09-18 1917-06-12 Gen Electric Incandescent cathode device.
US1279850A (en) * 1913-05-06 1918-09-24 William Dubilier Wireless apparatus and method therefor.
US1309704A (en) * 1919-07-15 stoekle
US1559714A (en) * 1919-12-12 1925-11-03 John H Brickenstein Art of releasing electrons in vacuum discharge devices
US1565659A (en) * 1921-09-03 1925-12-15 Julius E Lilienfeld High-vacuum device for influencing currents
US1577846A (en) * 1918-12-27 1926-03-23 Western Electric Co Electric space discharge device and method of operating the same
US1661579A (en) * 1922-07-28 1928-03-06 Cooper Hewitt Electric Co Bulb rectifier
US1705377A (en) * 1922-08-08 1929-03-12 Vickers Electrical Co Ltd Thermionic device
US1863702A (en) * 1926-04-12 1932-06-21 Raytheon Inc Gaseous conduction method and apparatus
US1930088A (en) * 1929-01-03 1933-10-10 Gen Electric Vapor Lamp Co Electrical discharge device
US1965589A (en) * 1932-10-11 1934-07-10 Gen Electric Vapor Lamp Co Gaseous electric discharge device and method of making the same
US1984877A (en) * 1930-11-21 1934-12-18 Telefunken Gmbh Gaseous discharge amplifier tube
US1986894A (en) * 1931-07-22 1935-01-08 Radio Res Lab Inc Nonregenerative system and method of operating the same
US2163157A (en) * 1937-07-22 1939-06-20 Bell Telephone Labor Inc Electron discharge apparatus
US2293468A (en) * 1939-09-16 1942-08-18 Univ Illinois Cold cathode rectifier
US2406276A (en) * 1942-11-13 1946-08-20 Gen Electric Electric discharge device
US2409716A (en) * 1941-09-27 1946-10-22 Westinghouse Electric Corp High-voltage discharge device
US2456896A (en) * 1944-08-08 1948-12-21 Westinghouse Electric Corp Ultra high frequency device

Patent Citations (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1309704A (en) * 1919-07-15 stoekle
US1279850A (en) * 1913-05-06 1918-09-24 William Dubilier Wireless apparatus and method therefor.
US1230004A (en) * 1915-09-18 1917-06-12 Gen Electric Incandescent cathode device.
US1577846A (en) * 1918-12-27 1926-03-23 Western Electric Co Electric space discharge device and method of operating the same
US1559714A (en) * 1919-12-12 1925-11-03 John H Brickenstein Art of releasing electrons in vacuum discharge devices
US1565659A (en) * 1921-09-03 1925-12-15 Julius E Lilienfeld High-vacuum device for influencing currents
US1661579A (en) * 1922-07-28 1928-03-06 Cooper Hewitt Electric Co Bulb rectifier
US1705377A (en) * 1922-08-08 1929-03-12 Vickers Electrical Co Ltd Thermionic device
US1863702A (en) * 1926-04-12 1932-06-21 Raytheon Inc Gaseous conduction method and apparatus
US1930088A (en) * 1929-01-03 1933-10-10 Gen Electric Vapor Lamp Co Electrical discharge device
US1984877A (en) * 1930-11-21 1934-12-18 Telefunken Gmbh Gaseous discharge amplifier tube
US1986894A (en) * 1931-07-22 1935-01-08 Radio Res Lab Inc Nonregenerative system and method of operating the same
US1965589A (en) * 1932-10-11 1934-07-10 Gen Electric Vapor Lamp Co Gaseous electric discharge device and method of making the same
US2163157A (en) * 1937-07-22 1939-06-20 Bell Telephone Labor Inc Electron discharge apparatus
US2293468A (en) * 1939-09-16 1942-08-18 Univ Illinois Cold cathode rectifier
US2409716A (en) * 1941-09-27 1946-10-22 Westinghouse Electric Corp High-voltage discharge device
US2406276A (en) * 1942-11-13 1946-08-20 Gen Electric Electric discharge device
US2456896A (en) * 1944-08-08 1948-12-21 Westinghouse Electric Corp Ultra high frequency device

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2782342A (en) * 1947-07-01 1957-02-19 Rca Corp Magnetron
US2691758A (en) * 1951-01-26 1954-10-12 Israel R Senitzky Method of measuring pressure with a magnetron
US2633556A (en) * 1951-08-02 1953-03-31 Beverly D Kumpfer Millimeter wave generator
US2813992A (en) * 1952-11-29 1957-11-19 Rca Corp Gas discharge device utilizing controlled electron trapping
US2869031A (en) * 1955-03-01 1959-01-13 Brett Herbert Cathode
US3091719A (en) * 1959-04-14 1963-05-28 Field Emission Corp Microwave transducer
US4104559A (en) * 1976-11-01 1978-08-01 Microwave Associates, Inc. Isopolar magnetron supported with rigid insulation in a remote housing
US5159241A (en) * 1990-10-25 1992-10-27 General Dynamics Corporation Air Defense Systems Division Single body relativistic magnetron
US5552672A (en) * 1993-09-03 1996-09-03 State Of Israel Ministry Of Defense, Armament Development Authority, Rafael Magnetron construction particularly useful as a relativistic magnetron
US6686696B2 (en) * 2001-03-08 2004-02-03 Genvac Aerospace Corporation Magnetron with diamond coated cathode

Also Published As

Publication number Publication date
GB627343A (en) 1949-08-08
FR943296A (fr) 1949-03-03
BE474423A (it)

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