WO2013094185A1 - Magnetron, and microwave heating device - Google Patents

Magnetron, and microwave heating device Download PDF

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Publication number
WO2013094185A1
WO2013094185A1 PCT/JP2012/008087 JP2012008087W WO2013094185A1 WO 2013094185 A1 WO2013094185 A1 WO 2013094185A1 JP 2012008087 W JP2012008087 W JP 2012008087W WO 2013094185 A1 WO2013094185 A1 WO 2013094185A1
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Prior art keywords
magnetron
top hat
hat
joined
lead
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PCT/JP2012/008087
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French (fr)
Japanese (ja)
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石井　健
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パナソニック株式会社
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    • 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
    • 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

Definitions

  • the present invention includes a magnetron cathode that increases the application area of the getter material, improves the degree of vacuum, stabilizes the quality characteristics, realizes a lighter component, and increases reliability.
  • the present invention relates to a magnetron and a microwave heating apparatus.
  • Magnetron is widely used in microwave communication devices and home appliances as an electron tube for generating microwaves as a kind of bipolar vacuum tube.
  • the magnetron generates a microwave by applying a high DC voltage of several kilovolts between a cylindrical cathode (cathode) and an anode (anode) surrounding the cathode.
  • a magnetron is widely used as a main part of a microwave oven that irradiates food with microwaves having a frequency of 2450 MHz and an output of about 700 to 1500 W and heats the food by a dielectric heating method.
  • FIG. 3 is a longitudinal sectional view showing a conventional magnetron.
  • FIG. 4 is a longitudinal sectional view showing another conventional magnetron.
  • magnetrons for microwave ovens have a magnetron cathode (cathode) installed in the magnetron body.
  • This magnetron cathode has a structure shown in FIG. 4, for example. That is, the magnetron cathode 1 includes a top hat 3d joined to the upper end of the center lead 2 and an end hat 5 joined to the upper end of the side lead 4 so as to face each other in the axial direction, and the top hat 3d and the end hat are arranged. 5 and the filament coil 6 is arranged between them.
  • the top hat 3d is formed of a molded product obtained by pressing a flat material made of a refractory metal (refractory metal), and is integrally joined to the upper end portion of the center lead 2.
  • a centering guide member 7 is fixed to the outer periphery of the upper end of the center lead 2. Further, the upper end of the filament coil 6 is fitted into the outer periphery of the centering guide member 7, and the upper end of the filament coil 6 is fixed.
  • the end hat 5 is formed of a sintered body of a high melting point metal such as molybdenum (Mo).
  • Mo molybdenum
  • the lower end of the filament coil 6 is fitted into the insertion opening formed in the center of the end hat 5, and the lower end of the filament coil 6 is fixed.
  • the side lead 4 is integrally joined to the bottom surface of the end hat 5 by resistance welding in a state where the upper end portion of the side lead 4 is butted.
  • the magnetron cathode 1 may have, for example, the structure shown in FIG.
  • the top hat 3 c is formed of a sintered body of a refractory metal and is integrally joined to the upper end portion of the center lead 2.
  • getter materials 10c and 10d are applied to the upper end portions of the top hats 3c and 3d in order to improve the degree of vacuum.
  • the area where the getter material can be applied is determined by the outer diameter of the top hat. For this reason, when the outer diameter of the top hat is small, the application area of the getter material may not be sufficient and the degree of vacuum may decrease.
  • the purpose of the present invention is to improve the degree of vacuum by increasing the coating area of the getter material to stabilize the quality characteristics, realize weight reduction of the constituent members, and improve the reliability of the magnetron and microwave heating Is to provide a device.
  • a top hat joined to the upper end of the center lead and an end hat joined to the upper end of the side lead are disposed to face each other in the axial direction, and a filament coil is provided between the top hat and the end hat.
  • the top hat is formed of a refractory metal. As a specific shape of the molded body constituting the top hat, the following forms are preferable.
  • the top hat has a convex portion that fits with an upper end portion of the filament coil, and a concave portion provided at the upper end of the top hat, and the end portion of the center lead is formed on the convex portion. It is preferable that the structure is bonded.
  • the cathode top hat is formed so that the surface area of the upper end portion is increased, the coating area of the getter material is increased and the degree of vacuum of the magnetron is increased as compared with the conventional top hat. It can be improved.
  • the top hat can be reduced in weight, the load condition of the lead rod that supports the end hat under high temperature conditions is also eased, and a lead rod with a smaller diameter can be used. Accordingly, the amount of material used can be reduced, and an inexpensive cathode can be mass-produced.
  • the reliability of the magnetron can be improved and the reliability of the microwave heating device can also be improved.
  • the longitudinal cross-sectional view which shows the principal part of the magnetron of 1st Embodiment The longitudinal cross-sectional view which shows the principal part of the magnetron of 2nd Embodiment Longitudinal section showing a conventional magnetron Longitudinal sectional view showing another conventional magnetron
  • a top hat joined to the upper end of the center lead and an end hat joined to the upper end of the side lead are arranged opposite to each other in the axial direction, and a filament is interposed between the top hat and the end hat.
  • the top hat is formed of a refractory metal, so that the reliability of the magnetron can be improved.
  • the top hat has a convex portion that fits with an upper end portion of the filament coil, and a concave portion provided at the upper end of the top hat,
  • the reliability of the magnetron can be improved by joining the end portion of the center lead to the convex portion.
  • the top hat has a convex portion that fits with the upper end portion of the filament coil, a through hole through which the center lead is inserted, and an upper end of the top hat.
  • the reliability of the magnetron can be improved by joining the end portion of the center lead to the recessed portion.
  • the refractory metal is molybdenum (Mo), whereby the reliability of the magnetron can be improved.
  • the reliability of the microwave heating apparatus can be improved by using the microwave heating apparatus provided with the magnetron of any one of the first to fourth aspects of the invention.
  • FIG. 1 is a longitudinal sectional view showing a magnetron cathode of the magnetron according to the first embodiment.
  • the magnetron cathode 101 included in the magnetron of the first embodiment includes a center lead 102, a top hat 103 joined to the upper end of the center lead 102, a side lead 104, and a side lead 104.
  • An end hat 105 joined to the upper end and a filament coil 106 are provided.
  • the end hat 105 is disposed to face the top hat 103 in the axial direction of the center lead 102.
  • the filament coil 106 is disposed between the top hat 103 and the end hat 105.
  • the top hat 103 is made of a refractory metal such as molybdenum (Mo).
  • the top hat 103 has a top hat convex portion 109 fitted to the upper end portion of the filament coil 106 and a top hat concave portion 108 provided at the upper end of the top hat 103.
  • the end portion of the center lead 102 is joined to the top hat convex portion 109 by resistance welding.
  • the dimensions of the outer diameter D and the height H of the end hat 105 are the same as those of the conventional end hat 5 shown in FIGS. 3 and 4.
  • the top hat recessed portion 108 is provided at the upper end of the top hat 103.
  • the upper end portion of the top hat 103 can secure a surface area of about 120 to 130% as compared with the conventional top hats 3c and 3d shown in FIGS. That is, the area of the getter material 110 applied to the upper end portion of the top hat 103 can be increased, so that the degree of vacuum can be improved.
  • the degree of vacuum is the same as the degree of vacuum obtained conventionally, the exhaust time can be shortened in this embodiment, and improvement in work efficiency can be expected.
  • the top hat 103 and center lead 102 shown in FIG. Therefore, the load condition of the center lead 102 that supports the top hat 103 can be relaxed. For this reason, in the configuration shown in FIG. 3, the center lead 2 which is a thick lead rod having a diameter of about 1.5 to 1.7 mm is required, but in the present embodiment, the diameter is 1.0 to 1. It becomes possible to use a thin center lead 102 of about 3 mm.
  • FIG. 2 is a longitudinal sectional view showing a magnetron cathode of the magnetron of the second embodiment.
  • the magnetron cathode 201 included in the magnetron of the second embodiment includes a center lead 202, a top hat 203 joined to the upper end of the center lead 202, a side lead 204, and a side lead 204.
  • An end hat 205 joined to the upper end and a filament coil 206 are provided.
  • the end hat 205 is disposed to face the top hat 203 in the axial direction of the center lead 202.
  • the filament coil 206 is disposed between the top hat 203 and the end hat 205.
  • the top hat 203 is made of a refractory metal such as molybdenum (Mo).
  • Mo molybdenum
  • the top hat 203 includes a top hat convex portion 209 that fits with the upper end portion of the filament coil 206, a through hole through which the center lead 202 is inserted, and a top hat recessed portion 208 provided at the upper end of the top hat 203. Have. The end of the center lead 202 is joined to the top hat recess 208.
  • the top hat recess 208 is provided at the upper end of the top hat 203.
  • the upper end portion of the top hat 203 can secure a surface area of about 120 to 130% as compared with the conventional top hats 3c and 3d shown in FIGS. That is, since the application area of the getter material 210 to the upper end portion of the top hat 203 can be increased, the degree of vacuum can be improved. If the degree of vacuum is the same, the exhaust time can be shortened, and work efficiency can be improved.
  • the magnetron and the microwave heating apparatus according to the present invention can improve reliability, they can be applied not only to home appliances but also to industrial products.

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Abstract

In a magnetron, a top hat of a cathode for the magnetron is formed from a metal having a high melting point. In said magnetron: said top hat and an end hat are arranged to face each other in an axial direction, said top hat being joined to an upper end of a center lead, said end hat being joined to an upper end of a side lead; and a filament coil is placed between the top hat and the end hat.

Description

マグネトロン及びマイクロ波加熱装置Magnetron and microwave heating device
　本発明は、ゲッター材の塗布面積を増加することにより、真空度を向上させて品質特性の安定化を図るとともに、構成部材の軽量化を実現し、信頼性を高めたマグネトロン用カソードを備えたマグネトロン及びマイクロ波加熱装置に関する。 The present invention includes a magnetron cathode that increases the application area of the getter material, improves the degree of vacuum, stabilizes the quality characteristics, realizes a lighter component, and increases reliability. The present invention relates to a magnetron and a microwave heating apparatus.
　２極真空管の一種でマイクロ波を発生させるための電子管として、マグネトロンが、マイクロ波通信装置及び家庭電化製品に広く利用されている。マグネトロンは、円筒形状の陰極（カソード）と当該陰極を取り囲む陽極（アノード）との間に数キロボルトの直流高電圧を印加し、マイクロ波を発生させる。現在では、周波数が２４５０ＭＨｚ、出力が７００～１５００Ｗ程度のマイクロ波を食品に照射して、誘電加熱方式によって食品を加熱調理する電子レンジの主要部品としてマグネトロンが広く利用されている。 Magnetron is widely used in microwave communication devices and home appliances as an electron tube for generating microwaves as a kind of bipolar vacuum tube. The magnetron generates a microwave by applying a high DC voltage of several kilovolts between a cylindrical cathode (cathode) and an anode (anode) surrounding the cathode. At present, a magnetron is widely used as a main part of a microwave oven that irradiates food with microwaves having a frequency of 2450 MHz and an output of about 700 to 1500 W and heats the food by a dielectric heating method.
　図３は、従来のマグネトロンを示す縦断面図である。また、図４は、従来の他のマグネトロンを示す縦断面図である。 FIG. 3 is a longitudinal sectional view showing a conventional magnetron. FIG. 4 is a longitudinal sectional view showing another conventional magnetron.
　従来の電子レンジ用のマグネトロンは、マグネトロン本体内に装備されるマグネトロン用カソード（陰極）を有する。このマグネトロン用カソードは、例えば図４に示す構造を有している。すなわち、マグネトロン用カソード１は、センターリード２の上端に接合したトップハット３ｄと、サイドリード４の上端に接合したエンドハット５とを軸方向に対向して配設し、トップハット３ｄとエンドハット５との間にフィラメントコイル６を配置して構成されている。 Conventional magnetrons for microwave ovens have a magnetron cathode (cathode) installed in the magnetron body. This magnetron cathode has a structure shown in FIG. 4, for example. That is, the magnetron cathode 1 includes a top hat 3d joined to the upper end of the center lead 2 and an end hat 5 joined to the upper end of the side lead 4 so as to face each other in the axial direction, and the top hat 3d and the end hat are arranged. 5 and the filament coil 6 is arranged between them.
　トップハット３ｄは、高融点金属（耐火性金属）の平板状素材をプレス加工した成形品から構成されており、センターリード２の上端部に一体に接合される。センターリード２の上端外周には、センタリング用ガイド部材７が固着されている。さらに、センタリング用ガイド部材７の外周にフィラメントコイル６の上端部が嵌挿されて、フィラメントコイル６の上端が固定される。 The top hat 3d is formed of a molded product obtained by pressing a flat material made of a refractory metal (refractory metal), and is integrally joined to the upper end portion of the center lead 2. A centering guide member 7 is fixed to the outer periphery of the upper end of the center lead 2. Further, the upper end of the filament coil 6 is fitted into the outer periphery of the centering guide member 7, and the upper end of the filament coil 6 is fixed.
　一方、エンドハット５は、モリブデン（Ｍｏ）などの高融点金属の焼結体で形成されている。エンドハット５の中央に形成された挿通口にはフィラメントコイル６の下端部が嵌挿されて、フィラメントコイル６の下端部が固定される。また、エンドハット５の底面には、サイドリード４の上端部が突き合された状態で、サイドリード４が抵抗溶接により一体に接合されている。 On the other hand, the end hat 5 is formed of a sintered body of a high melting point metal such as molybdenum (Mo). The lower end of the filament coil 6 is fitted into the insertion opening formed in the center of the end hat 5, and the lower end of the filament coil 6 is fixed. Further, the side lead 4 is integrally joined to the bottom surface of the end hat 5 by resistance welding in a state where the upper end portion of the side lead 4 is butted.
　マグネトロン用カソード１は、例えば図３に示す構造を有している場合もある。トップハット３ｃは、高融点金属の焼結体で形成されており、センターリード２の上端部に一体に接合される。 The magnetron cathode 1 may have, for example, the structure shown in FIG. The top hat 3 c is formed of a sintered body of a refractory metal and is integrally joined to the upper end portion of the center lead 2.
　図３及び図４に示したどちらの構成においても、真空度向上のためにトップハット３ｃ、３ｄの上端部にゲッター材１０ｃ、１０ｄ（粉末状のＴｉ等）が塗布されている。 3 and FIG. 4, getter materials 10c and 10d (powdered Ti or the like) are applied to the upper end portions of the top hats 3c and 3d in order to improve the degree of vacuum.
日本国特開２００１－３５３９８号公報（２００１年２月９日公開）Japanese Patent Laid-Open No. 2001-35398 (published on February 9, 2001) 日本国特開平１１－３０６９９８号公報（１９９９年１１月５日公開）Japanese Unexamined Patent Publication No. 11-306998 (published on November 5, 1999)
　しかしながら、上記説明したマグネトロン用カソードを有する従来のマグネトロンにおいて、ゲッター材を塗布できる面積はトップハットの外径で決まる。このため、トップハットの外径が小さいとゲッター材の塗布面積が足りずに真空度が低下する場合があった。 However, in the conventional magnetron having the above-described magnetron cathode, the area where the getter material can be applied is determined by the outer diameter of the top hat. For this reason, when the outer diameter of the top hat is small, the application area of the getter material may not be sufficient and the degree of vacuum may decrease.
　本発明の目的は、ゲッター材の塗布面積を増加することにより真空度を向上させて品質特性の安定化を図るとともに、構成部材の軽量化を実現し、信頼性を高めたマグネトロン及びマイクロ波加熱装置を提供することである。 The purpose of the present invention is to improve the degree of vacuum by increasing the coating area of the getter material to stabilize the quality characteristics, realize weight reduction of the constituent members, and improve the reliability of the magnetron and microwave heating Is to provide a device.
　本発明は、センターリードの上端に接合したトップハットと、サイドリードの上端に接合したエンドハットとを軸方向に対向して配設し、前記トップハットと前記エンドハットとの間にフィラメントコイルを配置したマグネトロンにおいて、前記トップハットが高融点金属から形成されたマグネトロンを提供する。トップハットを構成する成形体の具体的な形状としては、下記のような形態が好ましい。 In the present invention, a top hat joined to the upper end of the center lead and an end hat joined to the upper end of the side lead are disposed to face each other in the axial direction, and a filament coil is provided between the top hat and the end hat. In the arranged magnetron, the top hat is formed of a refractory metal. As a specific shape of the molded body constituting the top hat, the following forms are preferable.
　上記マグネトロンでは、前記トップハットは、前記フィラメントコイルの上端部と嵌合する凸部と、前記トップハットの上端に設けられた凹陥部と、を有し、前記凸部に前記センターリードの端部が接合された構成であることが好ましい。 In the magnetron, the top hat has a convex portion that fits with an upper end portion of the filament coil, and a concave portion provided at the upper end of the top hat, and the end portion of the center lead is formed on the convex portion. It is preferable that the structure is bonded.
　本発明に係るマグネトロンは、カソードのトップハットが上端部の表面積が増加するように成形されているため、従来のトップハットと比較して、ゲッター材の塗布面積が増加し、マグネトロンの真空度を向上できる。 In the magnetron according to the present invention, since the cathode top hat is formed so that the surface area of the upper end portion is increased, the coating area of the getter material is increased and the degree of vacuum of the magnetron is increased as compared with the conventional top hat. It can be improved.
　また、トップハットを軽量化できる構成でもあるため、高温条件下でエンドハットを支持するリード棒の荷重条件も緩和され、より細い径のリード棒を使用することができる。したがって、材料使用量を削減でき、安価なカソードを量産することが可能になる。 Also, since the top hat can be reduced in weight, the load condition of the lead rod that supports the end hat under high temperature conditions is also eased, and a lead rod with a smaller diameter can be used. Accordingly, the amount of material used can be reduced, and an inexpensive cathode can be mass-produced.
　また、本発明に係るマグネトロンをマイクロ波加熱装置に適用することにより、マグネトロンの信頼性が向上し、マイクロ波加熱装置の信頼性も向上することができる。 Also, by applying the magnetron according to the present invention to a microwave heating device, the reliability of the magnetron can be improved and the reliability of the microwave heating device can also be improved.
第１の実施の形態のマグネトロンの要部を示す縦断面図The longitudinal cross-sectional view which shows the principal part of the magnetron of 1st Embodiment 第２の実施の形態のマグネトロンの要部を示す縦断面図The longitudinal cross-sectional view which shows the principal part of the magnetron of 2nd Embodiment 従来のマグネトロンを示す縦断面図Longitudinal section showing a conventional magnetron 従来の他のマグネトロンを示す縦断面図Longitudinal sectional view showing another conventional magnetron
　第１の発明は、センターリードの上端に接合したトップハットと、サイドリードの上端に接合したエンドハットとを軸方向に対向して配設し、前記トップハットと前記エンドハットとの間にフィラメントコイルを配置したマグネトロンにおいて、前記トップハットが高融点金属から形成されるため、マグネトロンの信頼性を向上することができる。 According to a first aspect of the present invention, a top hat joined to the upper end of the center lead and an end hat joined to the upper end of the side lead are arranged opposite to each other in the axial direction, and a filament is interposed between the top hat and the end hat. In the magnetron in which the coil is arranged, the top hat is formed of a refractory metal, so that the reliability of the magnetron can be improved.
　第２の発明は、特に、第１の発明において、前記トップハットは、前記フィラメントコイルの上端部と嵌合する凸部と、前記トップハットの上端に設けられた凹陥部と、を有し、前記凸部に前記センターリードの端部が接合されることにより、マグネトロンの信頼性を向上することができる。 In a second aspect of the invention, in particular, in the first aspect of the invention, the top hat has a convex portion that fits with an upper end portion of the filament coil, and a concave portion provided at the upper end of the top hat, The reliability of the magnetron can be improved by joining the end portion of the center lead to the convex portion.
　第３の発明は、特に、第１の発明において、前記トップハットは、前記フィラメントコイルの上端部と嵌合する凸部と、前記センターリードが挿通するための貫通孔と、前記トップハットの上端に設けられた凹陥部と、を有し、前記凹陥部に前記センターリードの端部が接合されることにより、マグネトロンの信頼性を向上することができる。 According to a third aspect of the invention, in the first aspect of the invention, in the first aspect, the top hat has a convex portion that fits with the upper end portion of the filament coil, a through hole through which the center lead is inserted, and an upper end of the top hat. The reliability of the magnetron can be improved by joining the end portion of the center lead to the recessed portion.
　第４の発明は、特に、第１の発明において、前記高融点金属がモリブデン（Ｍｏ）とすることにより、マグネトロンの信頼性を向上することができる。 In the fourth invention, in particular, in the first invention, the refractory metal is molybdenum (Mo), whereby the reliability of the magnetron can be improved.
　第５の発明は、特に、第１～４のいずれか１つの発明のマグネトロンを備えたマイクロ波加熱装置とすることにより、マイクロ波加熱装置の信頼性を向上することができる。 In the fifth aspect of the invention, in particular, the reliability of the microwave heating apparatus can be improved by using the microwave heating apparatus provided with the magnetron of any one of the first to fourth aspects of the invention.
　以下、本発明の実施の形態について、図面を参照しながら説明する。なお、この実施の形態によって本発明が限定されるものではない。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.
　（第１の実施の形態）
　図１は、第１実施の形態のマグネトロンのマグネトロン用カソードを示す縦断面図である。 (First embodiment)
FIG. 1 is a longitudinal sectional view showing a magnetron cathode of the magnetron according to the first embodiment.
　図１に示すように、第１の実施の形態のマグネトロンが有するマグネトロン用カソード１０１は、センターリード１０２と、センターリード１０２の上端に接合したトップハット１０３と、サイドリード１０４と、サイドリード１０４の上端に接合したエンドハット１０５と、フィラメントコイル１０６とを備える。エンドハット１０５は、センターリード１０２の軸方向にトップハット１０３と対向して配設されている。また、フィラメントコイル１０６は、トップハット１０３とエンドハット１０５の間に配置されている。 As shown in FIG. 1, the magnetron cathode 101 included in the magnetron of the first embodiment includes a center lead 102, a top hat 103 joined to the upper end of the center lead 102, a side lead 104, and a side lead 104. An end hat 105 joined to the upper end and a filament coil 106 are provided. The end hat 105 is disposed to face the top hat 103 in the axial direction of the center lead 102. The filament coil 106 is disposed between the top hat 103 and the end hat 105.
　トップハット１０３は、モリブデン（Ｍｏ）などの高融点金属から形成されている。トップハット１０３は、フィラメントコイル１０６の上端部と嵌合するトップハット凸部１０９と、トップハット１０３の上端に設けられたトップハット凹陥部１０８とを有する。トップハット凸部１０９には、センターリード１０２の端部が抵抗溶接によって接合されている。エンドハット１０５の外径Ｄ及び高さＨの各寸法は、図３及び図４に示した従来のエンドハット５と同一である。 The top hat 103 is made of a refractory metal such as molybdenum (Mo). The top hat 103 has a top hat convex portion 109 fitted to the upper end portion of the filament coil 106 and a top hat concave portion 108 provided at the upper end of the top hat 103. The end portion of the center lead 102 is joined to the top hat convex portion 109 by resistance welding. The dimensions of the outer diameter D and the height H of the end hat 105 are the same as those of the conventional end hat 5 shown in FIGS. 3 and 4.
　本実施の形態のマグネトロンでは、トップハット１０３の上端にトップハット凹陥部１０８が設けられている。このため、トップハット１０３の上端部は、図３及び図４に示した従来のトップハット３ｃ、３ｄと比較して、約１２０～１３０％の表面積を確保できる。すなわち、トップハット１０３の上端部に対するゲッター材１１０の塗布面積を増加できるため、真空度の向上が可能である。なお、仮に従来得られていた真空度と同じ真空度であれば、本実施形態では排気時間を短縮することが可能であり、作業効率の改善も見込める。 In the magnetron of the present embodiment, the top hat recessed portion 108 is provided at the upper end of the top hat 103. For this reason, the upper end portion of the top hat 103 can secure a surface area of about 120 to 130% as compared with the conventional top hats 3c and 3d shown in FIGS. That is, the area of the getter material 110 applied to the upper end portion of the top hat 103 can be increased, so that the degree of vacuum can be improved. In addition, if the degree of vacuum is the same as the degree of vacuum obtained conventionally, the exhaust time can be shortened in this embodiment, and improvement in work efficiency can be expected.
　また、図３に示したトップハット３ｃ、センターリード２と比較して、図１に示したトップハット１０３、センターリード１０２ではセンターリード１０２が短くなった分だけトップハット１０３側の重量が軽減されるため、トップハット１０３を支持するセンターリード１０２の荷重条件も緩和できる。このため、図３に示した構成では、直径が１．５～１．７ｍｍ程度の太いリード棒であるセンターリード２が必要であったが、本実施の形態では、直径が１．０～１．３ｍｍ程度の細いセンターリード１０２を使用することが可能になった。 Compared with the top hat 3c and center lead 2 shown in FIG. 3, the top hat 103 and center lead 102 shown in FIG. Therefore, the load condition of the center lead 102 that supports the top hat 103 can be relaxed. For this reason, in the configuration shown in FIG. 3, the center lead 2 which is a thick lead rod having a diameter of about 1.5 to 1.7 mm is required, but in the present embodiment, the diameter is 1.0 to 1. It becomes possible to use a thin center lead 102 of about 3 mm.
　（第２の実施の形態）
　図２は、第２実施の形態のマグネトロンのマグネトロン用カソードを示す縦断面図である。 (Second Embodiment)
FIG. 2 is a longitudinal sectional view showing a magnetron cathode of the magnetron of the second embodiment.
　図２に示すように、第２の実施の形態のマグネトロンが有するマグネトロン用カソード２０１は、センターリード２０２と、センターリード２０２の上端に接合したトップハット２０３と、サイドリード２０４と、サイドリード２０４の上端に接合したエンドハット２０５と、フィラメントコイル２０６とを備える。エンドハット２０５は、センターリード２０２の軸方向にトップハット２０３と対向して配設されている。また、フィラメントコイル２０６は、トップハット２０３とエンドハット２０５の間に配置されている。 As shown in FIG. 2, the magnetron cathode 201 included in the magnetron of the second embodiment includes a center lead 202, a top hat 203 joined to the upper end of the center lead 202, a side lead 204, and a side lead 204. An end hat 205 joined to the upper end and a filament coil 206 are provided. The end hat 205 is disposed to face the top hat 203 in the axial direction of the center lead 202. The filament coil 206 is disposed between the top hat 203 and the end hat 205.
　トップハット２０３は、モリブデン（Ｍｏ）などの高融点金属から形成されている。トップハット２０３は、フィラメントコイル２０６の上端部と嵌合するトップハット凸部２０９と、センターリード２０２が挿通するための貫通孔と、トップハット２０３の上端に設けられたトップハット凹陥部２０８とを有する。トップハット凹陥部２０８には、センターリード２０２の端部が接合されている。 The top hat 203 is made of a refractory metal such as molybdenum (Mo). The top hat 203 includes a top hat convex portion 209 that fits with the upper end portion of the filament coil 206, a through hole through which the center lead 202 is inserted, and a top hat recessed portion 208 provided at the upper end of the top hat 203. Have. The end of the center lead 202 is joined to the top hat recess 208.
　本実施の形態のマグネトロンでは、トップハット２０３の上端にトップハット凹陥部２０８が設けられている。このため、トップハット２０３の上端部は、図３及び図４に示した従来のトップハット３ｃ、３ｄと比較して、約１２０～１３０％の表面積を確保できる。すなわち、トップハット２０３の上端部に対するゲッター材２１０の塗布面積を増加できるため、真空度の向上が可能である。なお、同じ真空度であれば、排気時間を短縮することが可能であり、作業効率の改善も見込める。 In the magnetron of the present embodiment, the top hat recess 208 is provided at the upper end of the top hat 203. For this reason, the upper end portion of the top hat 203 can secure a surface area of about 120 to 130% as compared with the conventional top hats 3c and 3d shown in FIGS. That is, since the application area of the getter material 210 to the upper end portion of the top hat 203 can be increased, the degree of vacuum can be improved. If the degree of vacuum is the same, the exhaust time can be shortened, and work efficiency can be improved.
　本発明を詳細にまた特定の実施態様を参照して説明したが、本発明の精神と範囲を逸脱することなく様々な変更や修正を加えることができることは当業者にとって明らかである。 Although the present invention has been described in detail and with reference to specific embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention.
　本出願は、2011年12月20日出願の日本特許出願（特願2011－278098）に基づくものであり、その内容はここに参照として取り込まれる。 This application is based on a Japanese patent application filed on December 20, 2011 (Japanese Patent Application No. 2011-278098), the contents of which are incorporated herein by reference.
　本発明に係るマグネトロン及びマイクロ波加熱装置は、信頼性を向上できるので、家庭電化製品だけでなく工業用製品にも適用できる。 Since the magnetron and the microwave heating apparatus according to the present invention can improve reliability, they can be applied not only to home appliances but also to industrial products.
１０１、２０１　マグネトロン用カソード
１０２、２０２　センターリード
１０３、２０３　トップハット
１０４、２０４　サイドリード
１０５、２０５　エンドハット
１０６、２０６　フィラメントコイル
１０８、２０８　トップハット凹陥部
１０９、２０９　トップハット凸部
１１０、２１０　ゲッター材 101, 201 Magnetron cathode 102, 202 Center lead 103, 203 Top hat 104, 204 Side lead 105, 205 End hat 106, 206 Filament coil 108, 208 Top hat concave portion 109, 209 Top hat convex portion 110, 210 Getter material

Claims (5)

  1. 　センターリードの上端に接合したトップハットと、サイドリードの上端に接合したエンドハットとを軸方向に対向して配設し、前記トップハットと前記エンドハットとの間にフィラメントコイルを配置したマグネトロンにおいて、
    　前記トップハットが高融点金属から形成されたことを特徴とするマグネトロン。     In a magnetron in which a top hat joined to the upper end of the center lead and an end hat joined to the upper end of the side lead are arranged facing each other in the axial direction, and a filament coil is arranged between the top hat and the end hat. ,
    The magnetron, wherein the top hat is made of a refractory metal.
  2. 　前記トップハットは、
    　前記フィラメントコイルの上端部と嵌合する凸部と、
    　前記トップハットの上端に設けられた凹陥部と、を有し、
    　前記凸部に前記センターリードの端部が接合されたことを特徴とする請求項１に記載のマグネトロン。     The top hat is
    A convex part to be fitted to the upper end part of the filament coil;
    A recessed portion provided at an upper end of the top hat,
    The magnetron according to claim 1, wherein an end portion of the center lead is joined to the convex portion.
  3. 　前記トップハットは、
    　前記フィラメントコイルの上端部と嵌合する凸部と、
    　前記センターリードが挿通するための貫通孔と、
    　前記トップハットの上端に設けられた凹陥部と、を有し、
    　前記凹陥部に前記センターリードの端部が接合されたことを特徴とする請求項１に記載のマグネトロン。     The top hat is
    A convex part to be fitted to the upper end part of the filament coil;
    A through hole through which the center lead is inserted;
    A recessed portion provided at an upper end of the top hat,
    The magnetron according to claim 1, wherein an end of the center lead is joined to the recessed portion.
  4. 　前記高融点金属はモリブデン（Ｍｏ）であることを特徴とする請求項１に記載のマグネトロン。 2. The magnetron according to claim 1, wherein the refractory metal is molybdenum (Mo).
  5. 　請求項１から４のいずれか１項に記載のマグネトロンを備えたマイクロ波加熱装置。 A microwave heating apparatus comprising the magnetron according to any one of claims 1 to 4.
PCT/JP2012/008087 2011-12-20 2012-12-18 Magnetron, and microwave heating device WO2013094185A1 (en)

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JPS51137237U (en) * 1975-04-28 1976-11-05
JPS62154535A (en) * 1985-12-27 1987-07-09 Hitachi Ltd Magnetron cathode structure
JPS63252340A (en) * 1987-04-08 1988-10-19 Hitachi Ltd Magnetron cathode structure
JPH04351834A (en) * 1991-05-29 1992-12-07 Hitachi Ltd Magnetron
JP2001035398A (en) * 1999-07-22 2001-02-09 Toshiba Corp Cathode for magnetron
JP2003242897A (en) * 2002-02-14 2003-08-29 Sanyo Electric Co Ltd Magnetron and method for manufacturing the same

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4866457U (en) * 1971-12-01 1973-08-23
JPS51137237U (en) * 1975-04-28 1976-11-05
JPS62154535A (en) * 1985-12-27 1987-07-09 Hitachi Ltd Magnetron cathode structure
JPS63252340A (en) * 1987-04-08 1988-10-19 Hitachi Ltd Magnetron cathode structure
JPH04351834A (en) * 1991-05-29 1992-12-07 Hitachi Ltd Magnetron
JP2001035398A (en) * 1999-07-22 2001-02-09 Toshiba Corp Cathode for magnetron
JP2003242897A (en) * 2002-02-14 2003-08-29 Sanyo Electric Co Ltd Magnetron and method for manufacturing the same

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