EP2148358A2 - Magnetrongerät - Google Patents

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Publication number
EP2148358A2
EP2148358A2 EP09166085A EP09166085A EP2148358A2 EP 2148358 A2 EP2148358 A2 EP 2148358A2 EP 09166085 A EP09166085 A EP 09166085A EP 09166085 A EP09166085 A EP 09166085A EP 2148358 A2 EP2148358 A2 EP 2148358A2
Authority
EP
European Patent Office
Prior art keywords
core
type inductor
core type
air
diameter
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.)
Withdrawn
Application number
EP09166085A
Other languages
English (en)
French (fr)
Other versions
EP2148358A3 (de
Inventor
Sayuri Doi
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.)
Toshiba Hokuto Electronics Corp
Original Assignee
Toshiba Hokuto Electronics Corp
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 Toshiba Hokuto Electronics Corp filed Critical Toshiba Hokuto Electronics Corp
Publication of EP2148358A2 publication Critical patent/EP2148358A2/de
Publication of EP2148358A3 publication Critical patent/EP2148358A3/de
Withdrawn legal-status Critical Current

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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
    • H01J23/14—Leading-in arrangements; Seals therefor
    • H01J23/15—Means for preventing wave energy leakage structurally associated with tube leading-in arrangements, e.g. filters, chokes, attenuating devices
    • 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
    • H01J23/14—Leading-in arrangements; Seals therefor
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/70—Electron beam control outside the vessel
    • H01J2229/703—Electron beam control outside the vessel by magnetic fields
    • H01J2229/7031—Cores for field producing elements, e.g. ferrite

Definitions

  • the present invention relates to a magnetron device used for microwave ovens, etc., and especially to a choke coil mounted inside a filter box.
  • the magnetron is provided with an oscillating portion comprising an anode portion, an input portion and an output portion.
  • the anode portion comprises an anode cylinder and a plurality of vanes that are radially arranged inside the anode cylinder, a cathode portion of a filament positioned on the anode axis i.e. the tube axis, and a pair of pole pieces disposed on both ends of the anode cylinder.
  • the input portion comprises a stem that supports a cathode lead extending upon penetrating one of the pole pieces of the oscillating portion, and the output portion includes an antenna extending upon penetrating the other of the pole pieces of the oscillating portion.
  • the pole pieces are interposed between the permanent magnets, and converge the magnetic flux on the interaction space between the anode portion and the cathode portion.
  • the choke coil constituting the filter circuit consumes a microwave leaking from the cathode portion as a heat. Therefore, the choke coil may be burned out if the leakage output is increased.
  • leakage of microwave is raised because the inductance diminishes when the magnetic permeability of the ferrite core decreases due to overheat.
  • the air-core inductor attenuates the maximum amplitude of the standing wave of the fundamental wave of 2450 MHz, which is the greatest component of leaking waves, so as not to reach the core type inductor to alleviate load of the core type inductor.
  • the choke coil should be preferably large-sized in order to radiate the heat and to reduce the leakage power as mentioned above.
  • the choke coil gets close to the inner wall of the filter box due to large-sizing and, as a result, electric discharge takes place, so that the filter box cannot be miniaturized.
  • the cathode filament current supplied from an external power source is 9.0 to 12.0 A, and the current of leakage microwave is superposed thereon.
  • the standing wave of the fundamental wave of microwave has high amplitude at the position of the core type inductor, and as a result, the winding wire of the coil of the coil type inductor is damaged.
  • back heat cathode inverse bombardment
  • Back heat is a phenomenon in which a part of thermal electrons emitted from the filament cathode returns to the filament by obtaining energy from the oscillating microwave.
  • the back-heat (%) is represented by lfb/lf ⁇ 100 (%), which means that the number of electrons coming back to the cathode increase as the value of the back-heat decreases.
  • the minimum value of the back-heat should be 90% or more for the magnetron structure mentioned above.
  • the value can be maintained by making both the choke coil and the filter box large. However, the volume of the filter box is so large to the magnetron body that miniaturization thereof is prevented, and furthermore reduction of the cost of the choke coil is inhibited.
  • a magnetron device of the present invention comprising, a filter box disposed in order to cover a cathode terminal of a magnetron tube body, a choke coil accommodated in the filter box, comprised of a core type inductor having a magnetic core and an air-core type inductor, both thereof being connected together serially, and the air-core type inductor being connected with the cathode terminal, and a feed-through capacitor connected with the core type inductor of the choke coil, constituting a filter circuit together with the choke coil and penetrating the filter box; and the wire's diameter of coils for the core type inductor and the air-core type inductor being 1.0 to 1.4 mm, the cross sectional area of the magnetic core being 5 to 16 mm 2 , and the number T of turns of the coil for the air-core type inductor being represented by 55 ⁇ 2 ⁇ ⁇ ⁇ D + A / 2 ⁇ T ⁇ 90 , where A (mm) is the wire's diameter of the coil, and
  • the present invention is intended to make sure of a desired back-heat value and enable miniaturization of the filter box.
  • FIG. 2 shows the filter box 31 covering the input portion 30 of the magnetron and the inside of the filter box.
  • the input portion 30 is constituted of the ceramics stem 32 holding the cathode center lead 18 and the cathode side lead 19, and the cathode terminals 33, 33 connected to the leads respectively.
  • the 2-terminal feed-through capacitors 34, 34 are mounted on the wall portion of the filter box, and the choke coils 35, 35 are serially connected between the cathode terminals 33, 33 positioned at the central part of the filter box 31 and the feed-through capacitors 34, 34 respectively.
  • the filter circuit is composed of the capacitors and the choke coils.
  • the lower limit 55 of the formula (1) regulates the range where an appropriate back-heat characteristic can be obtained, and the upper limit 90 is a practical value to get away from large-sizing of the choke coil.
  • the diameter of the choke coil 35 comes to be 5mm on the condition of 3 mm of the diameter of the ferrite core and 1 mm of the diameter of the winding wire for the coil, and then the clearance of the inner wall of the filter box 31 is diminished to be 37 mm.
  • the formula (1) which the inventors have originated as a mathematical expression, shows a choke coil's structure capable of operating stably upon obtaining the back heat of 90% or more when the wire's diameter of the choke coil is decreased to 1.0 to 1.4 mm and the cross sectional area of the magnetic core is reduced to 5 to 16 mm 2 . Consequently, in accordance with the present invention, many effects such as high reliability of operation of the magnetron, suppression of temperature rising of the choke coil, miniaturization of the choke coil, reduction of cost about the choke coil, and miniaturization of the filter box can be obtained.

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  • Microwave Tubes (AREA)
EP09166085A 2008-07-23 2009-07-22 Magnetrongerät Withdrawn EP2148358A3 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2008189971A JP2010027503A (ja) 2008-07-23 2008-07-23 マグネトロン装置

Publications (2)

Publication Number Publication Date
EP2148358A2 true EP2148358A2 (de) 2010-01-27
EP2148358A3 EP2148358A3 (de) 2010-07-28

Family

ID=41032481

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09166085A Withdrawn EP2148358A3 (de) 2008-07-23 2009-07-22 Magnetrongerät

Country Status (4)

Country Link
EP (1) EP2148358A3 (de)
JP (1) JP2010027503A (de)
KR (1) KR20100010917A (de)
CN (1) CN101635244B (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6723043B2 (ja) * 2016-03-25 2020-07-15 東芝ホクト電子株式会社 マグネトロン

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002343263A (ja) 2001-05-22 2002-11-29 Sanyo Electric Co Ltd マグネトロン

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06101305B2 (ja) * 1986-07-16 1994-12-12 松下電器産業株式会社 マグネトロンのチヨ−クコイル
JPH11233036A (ja) * 1998-02-12 1999-08-27 Matsushita Electron Corp マグネトロン装置
JP4898169B2 (ja) * 2005-04-26 2012-03-14 パナソニック株式会社 電子レンジ用マグネトロン及び電子レンジ

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002343263A (ja) 2001-05-22 2002-11-29 Sanyo Electric Co Ltd マグネトロン

Also Published As

Publication number Publication date
EP2148358A3 (de) 2010-07-28
CN101635244B (zh) 2011-08-10
CN101635244A (zh) 2010-01-27
KR20100010917A (ko) 2010-02-02
JP2010027503A (ja) 2010-02-04

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