US3588588A - Magnetron device with exiting permanent magnet free from magnetic short-circuiting by frame - Google Patents

Magnetron device with exiting permanent magnet free from magnetic short-circuiting by frame Download PDF

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Publication number
US3588588A
US3588588A US833253A US3588588DA US3588588A US 3588588 A US3588588 A US 3588588A US 833253 A US833253 A US 833253A US 3588588D A US3588588D A US 3588588DA US 3588588 A US3588588 A US 3588588A
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US
United States
Prior art keywords
permanent magnet
vessel
magnetron
insulator
magnetron device
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
US833253A
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English (en)
Inventor
Tsuneo Numata
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita 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
Priority claimed from JP4350768A external-priority patent/JPS5249306B1/ja
Priority claimed from JP4350668A external-priority patent/JPS4945620B1/ja
Priority claimed from JP43056614A external-priority patent/JPS4925393B1/ja
Priority claimed from JP43056613A external-priority patent/JPS4925392B1/ja
Priority claimed from JP7982168U external-priority patent/JPS5126051Y1/ja
Application filed by Matsushita Electronics Corp filed Critical Matsushita Electronics Corp
Application granted granted Critical
Publication of US3588588A publication Critical patent/US3588588A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • H01J23/10—Magnet systems for directing or deflecting the discharge along a desired path, e.g. a spiral path
    • 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
    • H01J23/005—Cooling methods or arrangements

Definitions

  • a magnetron device in which an upper insulator vessel including therein cathode lead members extending from a cathode contained, together with an anode, a cavity resonator and magnetic pole pieces, in a metal vessel is disposed in an axial hole in a cylindrical or conical permanent magnet for exciting a magnetron with an interstice therebetween to define a ventilation flue for effectively cooling the upper insulator vessel and the permanent magnet to prevent the insulator vessel from breakage due to uneven heating of the insulator vessel by making the distribution of the temperature of the insulator vessel even.
  • the present invention relates to magnetron devices, and more particularly to magnetron devices suitable for use in electronic ranges.
  • a magnetron comprising a tubular metal vessel including therein a cathode, an anode surrounding said cathode, an upper magnetic pole piece, a lower magnetic pole piece, and a cavity resonator; an upwardly projecting upper insulator vessel contiguous to said upper pole piece and enclosing therein a cathode lead member; and a downwardly projecting lower insulator vessel contiguous to said lower pole piece and enclosing therein an antennalike electromagnetic wave emitting electrode extending from said cavity resonator is disclosed, for example, in U.S. Pat. No. 2,721,294 to E. J. Shelton.
  • a magnetron coupled with a cylindrical permanent magnet is also known, for example, by U.S. Pat. No. 2,824,261 to P. H. Peters et al.
  • a magnetron device comprising a magnetron having a tubular metal vessel including therein a cathode, an anode surrounding said cathode, an upper magnetic pole piece, a lower magnetic pole piece, and a cavity resonator, an upwardly projecting upper insulator vessel contiguous to said upper pole piece and enclosing a cathode lead member therein, and a downwardly projecting lower insulator vessel contiguous to said lower pole piece and enclosing therein an antennalike electromagnetic wave emitting electrode extending from said cavity resonator; a permanent magnet having an axial hole the diameter of which is greater than the diameter of said upper insulator vessel; and yoke means for magnetically coupling said permanent magnet with said magnetron, characterized in that said permanent magnet is arranged coaxially with said metal vessel in such a manner that at least a great part of said upper insulator vessel is disposed in said axial hole of said pennanent magnet with interstice there
  • FIG. 1 is a partly broken perspective view of an embodiment of the invention
  • FIG. 2 is a partly broken side view of the embodiment of FIG. 1;
  • FIG. 3 is a partly broken perspective view of another embodiment of the invention.
  • FIG. 4 is a partly broken side view of the embodiment of FIG. 3;
  • FIG. 5 is a partly broken perspective view of a further embodiment of the invention.
  • FIG. 6 is a partly exploded side view of a still further embodiment of the invention.
  • FIG. 7 is a partly exploded perspective view of another embodiment of the invention.
  • a magnetron 1 comprises a cylindrical metal vessel 2 and cup-shaped insulator vessels 3 and 4 made of glass, ceramic or the like sealed to the upper and lower ends of the cylindrical metal vessel 2.
  • a cathode 17 and an anode 19 surrounding the cathode 17 are provided coaxially with the vessel 2, and upper and lower magnetic pole pieces 24 and 25 are provided at the upper and lower ends of the vessel 2, respectively.
  • a cavity resonator 26 in a space adjacent to the anode inside the vessel 2 there is provided a cavity resonator 26.
  • Cathode lead members connected with the cathode are enclosed in the upper insulator vessel 3, and an antennalike electromagnetic wave emitting electrode 5 extending from the cavity resonator 26 is enclosed in the lower insulator vessel 4.
  • a radiator 6 for air cooling the magnetron 1 comprises an appropriate number of good thermally conductive radiating plates 9 piled up with certain intervals therebetween disposed between an intake port 7 and an exhaust port 8.
  • the heat radiating plates 9 are welded to the circumference of 'the metal vessel 2.
  • the radiator 6 effects forced cooling of the magnetron 1 by combination with a blower.
  • a conical or cylindrical permanent magnet 10 preferably made of ferrite has an axial hole 11 within which the whole or a great part of the upper insulator vessel 3 is disposed without touching the magnet 10.
  • the lower end surface of the permanent magnet 10 is in contact with the upper surface of the upper pole piece 24 in the metal vessel 2 directly or through the intermediary of a thin heat insulating packing, whereby one pole of the pennanent magnet 10 is magnetically coupled with the upper pole piece 24.
  • the other pole, Le. the upper surface of the permanent magnet 10 is magnetically coupled with the lower pole piece 25 through a high permeability metal frame members 12 and 13 which serve as magnetic coupling means, the frame member 13 being in contact with the lower surface of the lower pole piece 25 directly or through an interposed thin heat insulating packing.
  • the frame member 13 has a hole 14 through which the lower insulator vessel 4 enclosing therein the electromagnetic wave emitting electrode 5 protrudes downward.
  • the frame member 13 has also an appropriate number of holes 15 for screws for mounting the magnetron device on an electronic range.
  • Leadout parts 16 of the cathode lead members extend outward from the upper insulator vessel 3.
  • the radiator 6 has a second exhaust port 18, and the permanent magnet 10 has a ventilation flue 20 cut through the sidewall thereof.
  • a cooling air current fed from the intake port 7 of the radiator 6 through the exhaust port 18 to the permanent magnet 10 is led to the magnetron 1 through the ventilation flue 20, and goes up in the axial hole 11 along the surface of the heated upper insulator vessel 3 to effectively cool the permanent magnet 10 and the upper insulator vessel 3.
  • the ventilation flue 20 is shown as of slit shape in FIGS. 3 and 4, other shapes of hole or channel may be employed as well. Of course, two or more ventilation flues can be employed. It is not always necessary to supply the cooling air current to the ventilation flue 20 through the radiator 6, but it may be supplied directly from a blower.
  • the former magnet is preferable to the device of this invention for the reason that the ferrite group magnet has a good workability and is excellent in the efficiency of heat absorption and heat radiation because ofits pitch-dark color. Since the permanent magnet 10 surrounds the upper insulator vessel 3 almost along the entire length ofthe vessel 3, the magnet 10, when it is of ferrite, effectively dissipates the heat of the magnetron 1 generated at the time of its operation, and makes the heating of the whole of the upper insulator vessel 3 approximately even to reduce the strain of the vessel 3 resulting from uneven heating. It is desirable to provide a magnetoshielding metal layer on the surface of the wall of the axial hole of the ferrite magnet 10.
  • both poles of the permanent magnet 10 are substantially magnetically short circuited through the frame member 12 with the result that the density of magnetic flux to be supplied to the magnetron l is reduced.
  • An embodiment provided against this short circuiting is shown in FIG. 6.
  • magnets 30 for repulsion are provided on the inner side of the frame member 12 at positions corresponding to the lower pole of the permanent magnet 10 in such a manner that the lower pole of the permanent magnet 10 and the same kind of poles of the magnets 30 are opposed to each other. Consequently, the short circuiting of the permanent magnet 10 by means of the frame member 12 is prevented by the magnetic field originated from the magnets 30. It was found by experiments that while the density of magnetic flux supplied to the metal vessel 2 was about 1,730 gauss when the outer diameter of the metal vessel 2 was 70 mm., the outer diameter and height of the cylindrical permanent magnet 10 were about 80 mm.
  • the interval between the outer wall of the permanent magnet 10 and the inner wall of the frame member 112 was about mm., it was increased to about L880 gauss when two small permanent magnets for repulsive magnetic field generation were employed.
  • Either permanent magnets or electromagnets can be employed as the magnets 30 for the repulsive field generation.
  • a cylindrical permanent magnet 100 surrounds not only all or a great part of the insulator vessel 3, but also the metal vessel 2 and the radiator 6.
  • a window'ltll formed through the sidewall of the permanent magnet I00 fits the intake port 8 of the radiator 6.
  • a yoke 102 in this embodiment is cylindrical and arranged inside the cylindrical permanent magnet 100.
  • a magnetron device comprising a magnetron having a tubular metal vessel including therein a cathode, an anode surrounding said cathode, an upper magnetic pole piece 24, a lower magnetic pole piece, and a cavity resonator, an upwardly projecting upper insulator vessel contiguous to said upper pole piece and enclosing a cathode lead member therein, and a downwardly projecting lower insulator vessel contiguous to said lower pole piece and enclosing therein an antennalike electromagnetic wave emitting electrode extending from said cavity resonator; a permanent magnet having an axial hole the diameter of which is greater than the diameter of said upper insulator vessel; and a frame member magnetically coupling said permanent magnet with said magnetron, wherein said permanent magnet is arranged coaxially with said metal vessel in such a manner that at least a greater part of said upper insulator vessel is disposed in said axial hole of said permanent magnet with an air space therebetween with the lower end surface of said permanent magnet being coupled with the upper
  • a magnetron device according to claim 1, wherein said permanent magnet is provided with at least one hole or channel through its sidewall, said hole'or channel communicating with said air space to define a ventilation flue.
  • a magnetron device comprising a yoke member interposed between said permanent magnet and said upper magnetic pole, said yoke member being provided with at least one hole or channel through its sidewall, said hole or channel communicating with said air space to define a ventilation flue.
  • a magnetron device in which said permanent magnet is a ferrite group magnet.
  • a magnetron device wherein said frame member is provided with at least one magnet for developing a repulsive field to said permanent magnet at a position close to and opposing the periphery of the lower edge ofsaid permanent magnet.
  • a magnetron device wherein the sidewall of said axial hole of said permanent magnet is provided with a magnetoshielding metal layer.
  • a magnetron device comprising a magnetron having a tubular metal vessel including therein a cathode, an anode surrounding said cathode, an upper magnetic pole piece, a lower magnetic pole piece, and a cavity resonator, an upwardly projecting upper insulator vessel contiguous to said upper pole piece and enclosing a cathode lead member therein, and a downwardly projecting lower insulator vessel contiguous to said lower pole piece and enclosing therein an antennalike electromagnetic wave emitting electrode extending from said cavity resonator; a permanent magnet having an axial hole the diameter of which is greater than the diameter of said upper insulator vessel; and yoke means for magnetically coupling said permanent magnet with said magnetron, wherein said permanent magnet is arranged on said upper magnetic pole piece such that said upper insulator vessel is disposed in said axial hole of said permanent magnet with an air space therebetween defining a ventilation flue, and said lower insulator vessel extends downward through said yoke means
  • a magnetron device according to claim ll, wherein the lower diameter of said permanent magnet is smaller than the upper diameter thereof.
  • a magnetron device wherein the lateral extension of the lower part of said frame member is larger than that of the upper part thereof.
  • a magnetron device according to claim 3, wherein the lower diameter of said yoke member is smaller than the upper diameter thereof.

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US833253A 1968-06-21 1969-06-16 Magnetron device with exiting permanent magnet free from magnetic short-circuiting by frame Expired - Lifetime US3588588A (en)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP4350768A JPS5249306B1 (fr) 1968-06-21 1968-06-21
JP4350668A JPS4945620B1 (fr) 1968-06-21 1968-06-21
JP43056614A JPS4925393B1 (fr) 1968-08-07 1968-08-07
JP43056613A JPS4925392B1 (fr) 1968-08-07 1968-08-07
JP7982168U JPS5126051Y1 (fr) 1968-09-13 1968-09-13
JP8594968 1968-09-30

Publications (1)

Publication Number Publication Date
US3588588A true US3588588A (en) 1971-06-28

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Family Applications (1)

Application Number Title Priority Date Filing Date
US833253A Expired - Lifetime US3588588A (en) 1968-06-21 1969-06-16 Magnetron device with exiting permanent magnet free from magnetic short-circuiting by frame

Country Status (5)

Country Link
US (1) US3588588A (fr)
DE (1) DE1930015B2 (fr)
FR (1) FR2011445A1 (fr)
GB (1) GB1257505A (fr)
NL (1) NL6909461A (fr)

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3716750A (en) * 1970-05-13 1973-02-13 T Oguro Magnetrons
JPS4870545U (fr) * 1971-12-07 1973-09-05
JPS4870546U (fr) * 1972-09-25 1973-09-05
JPS4888866A (fr) * 1972-02-22 1973-11-21
JPS4899051U (fr) * 1972-02-28 1973-11-22
JPS48113355U (fr) * 1972-03-31 1973-12-25
US3794879A (en) * 1972-10-24 1974-02-26 Raytheon Co Microwave magnetron
JPS4922856A (fr) * 1972-04-24 1974-02-28
JPS4936852U (fr) * 1972-06-30 1974-04-01
JPS4936853U (fr) * 1972-06-30 1974-04-01
US3809950A (en) * 1972-02-18 1974-05-07 Tokyo Shibaura Electric Co Magnetron
JPS4977845U (fr) * 1972-10-19 1974-07-05
JPS4985962U (fr) * 1972-11-14 1974-07-25
JPS49108961A (fr) * 1973-12-12 1974-10-16
US3843904A (en) * 1973-08-01 1974-10-22 Us Navy Magnetic field geometry for crossed-field devices
US3881127A (en) * 1973-11-01 1975-04-29 Us Navy Bucking samarium cobalt magnets for crossed field devices
JPS5076973A (fr) * 1974-11-18 1975-06-24
US3916247A (en) * 1973-07-16 1975-10-28 Tokyo Shibaura Electric Co Shell type magnetron device
JPS51874A (ja) * 1974-06-20 1976-01-07 Matsushita Electronics Corp Magunetoronsochi
US4042851A (en) * 1975-07-30 1977-08-16 Sanyo Electric Co., Ltd. Magnetron
JPS5359356A (en) * 1976-11-09 1978-05-29 Matsushita Electronics Corp Magnetron unit
US4204138A (en) * 1977-04-27 1980-05-20 Tokyo Shibaura Electric Co., Ltd. Permanent magnet-containing magnetron
US4282459A (en) * 1978-09-06 1981-08-04 Tomokatsu Oguro Magnetron
US4794304A (en) * 1985-12-27 1988-12-27 Matsushita Electronics Corporation Magnetron with cooling fin structure
US5210465A (en) * 1989-11-06 1993-05-11 Eev Limited Magnetron having an tm01 output coupling probe passing through a coupling iris
US5508583A (en) * 1992-07-28 1996-04-16 Samsung Electronics Co., Ltd. Cathode support structure for magnetron
WO2003039192A1 (fr) * 2001-11-01 2003-05-08 Isis Innovation Limited Transducteur a bobine mobile ameliore

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2453497A1 (fr) * 1979-04-03 1980-10-31 Thomson Csf Dispositif de focalisation a aimants permanents pour tube electronique, et tube electronique muni d'un tel dispositif

Cited By (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3716750A (en) * 1970-05-13 1973-02-13 T Oguro Magnetrons
JPS5336053Y2 (fr) * 1971-12-07 1978-09-02
JPS4870545U (fr) * 1971-12-07 1973-09-05
US3809950A (en) * 1972-02-18 1974-05-07 Tokyo Shibaura Electric Co Magnetron
JPS4888866A (fr) * 1972-02-22 1973-11-21
JPS4899051U (fr) * 1972-02-28 1973-11-22
JPS5435645Y2 (fr) * 1972-02-28 1979-10-29
JPS48113355U (fr) * 1972-03-31 1973-12-25
JPS5543650Y2 (fr) * 1972-03-31 1980-10-14
JPS5629333B2 (fr) * 1972-04-24 1981-07-08
JPS4922856A (fr) * 1972-04-24 1974-02-28
JPS4936853U (fr) * 1972-06-30 1974-04-01
JPS4936852U (fr) * 1972-06-30 1974-04-01
JPS5343078Y2 (fr) * 1972-09-25 1978-10-17
JPS4870546U (fr) * 1972-09-25 1973-09-05
JPS535476Y2 (fr) * 1972-10-19 1978-02-10
JPS4977845U (fr) * 1972-10-19 1974-07-05
US3794879A (en) * 1972-10-24 1974-02-26 Raytheon Co Microwave magnetron
JPS4985962U (fr) * 1972-11-14 1974-07-25
US3916247A (en) * 1973-07-16 1975-10-28 Tokyo Shibaura Electric Co Shell type magnetron device
US3843904A (en) * 1973-08-01 1974-10-22 Us Navy Magnetic field geometry for crossed-field devices
US3881127A (en) * 1973-11-01 1975-04-29 Us Navy Bucking samarium cobalt magnets for crossed field devices
JPS49108961A (fr) * 1973-12-12 1974-10-16
JPS51874A (ja) * 1974-06-20 1976-01-07 Matsushita Electronics Corp Magunetoronsochi
JPS574054B2 (fr) * 1974-06-20 1982-01-23
JPS5336310B2 (fr) * 1974-11-18 1978-10-02
JPS5076973A (fr) * 1974-11-18 1975-06-24
US4042851A (en) * 1975-07-30 1977-08-16 Sanyo Electric Co., Ltd. Magnetron
JPS5359356A (en) * 1976-11-09 1978-05-29 Matsushita Electronics Corp Magnetron unit
US4204138A (en) * 1977-04-27 1980-05-20 Tokyo Shibaura Electric Co., Ltd. Permanent magnet-containing magnetron
US4282459A (en) * 1978-09-06 1981-08-04 Tomokatsu Oguro Magnetron
US4794304A (en) * 1985-12-27 1988-12-27 Matsushita Electronics Corporation Magnetron with cooling fin structure
US5210465A (en) * 1989-11-06 1993-05-11 Eev Limited Magnetron having an tm01 output coupling probe passing through a coupling iris
US5508583A (en) * 1992-07-28 1996-04-16 Samsung Electronics Co., Ltd. Cathode support structure for magnetron
WO2003039192A1 (fr) * 2001-11-01 2003-05-08 Isis Innovation Limited Transducteur a bobine mobile ameliore
US20040245864A1 (en) * 2001-11-01 2004-12-09 Bailey Paul Brian Moving coil transducer

Also Published As

Publication number Publication date
DE1930015B2 (de) 1971-12-02
NL6909461A (fr) 1969-12-23
GB1257505A (fr) 1971-12-22
FR2011445A1 (fr) 1970-02-27
DE1930015A1 (de) 1970-01-15

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