JP3738261B2 - Magnetron - Google Patents

Magnetron Download PDF

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JP3738261B2
JP3738261B2 JP2004004063A JP2004004063A JP3738261B2 JP 3738261 B2 JP3738261 B2 JP 3738261B2 JP 2004004063 A JP2004004063 A JP 2004004063A JP 2004004063 A JP2004004063 A JP 2004004063A JP 3738261 B2 JP3738261 B2 JP 3738261B2
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conductive gasket
yoke
shim plate
opening
magnetron
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JP2005197160A (en
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啓成 橋本
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Toshiba Hokuto Electronics Corp
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Toshiba Hokuto Electronics Corp
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Description

この発明は、電子レンジなどに使用するマグネトロンに関する。   The present invention relates to a magnetron used for a microwave oven or the like.

マグネトロンは高周波を発生する電子管で、電子レンジの加熱源などに使用されている。   A magnetron is an electron tube that generates a high frequency and is used as a heating source of a microwave oven.

ここで、従来のマグネトロンについて、その主要部を抜き出して示した図3の断面図を参照して説明する。   Here, a conventional magnetron will be described with reference to the sectional view of FIG.

符号30は発振部本体を構成する陽極円筒で、陽極円筒30の内側空間に、複数の陽極ベイン31や陰極(図示せず)が配置されている。陽極円筒30の端部開口部分にポールピース32が設けられている。ポールピース32は管軸m上に開口32aが設けられ、管軸mからずれた位置に透孔32bが形成されている。ポールピース32の図示上方に筒状金属容器33が配置されている。   Reference numeral 30 denotes an anode cylinder constituting the oscillating unit main body, and a plurality of anode vanes 31 and cathodes (not shown) are arranged in an inner space of the anode cylinder 30. A pole piece 32 is provided at the end opening of the anode cylinder 30. The pole piece 32 is provided with an opening 32a on the tube axis m, and a through hole 32b is formed at a position shifted from the tube axis m. A cylindrical metal container 33 is disposed above the pole piece 32 in the figure.

金属容器33は、たとえば外側に広がるフランジ部33aおよび管軸mの延長方向に伸びる筒状部33b、高周波チョークとして機能する内側に折れ曲がった折曲部33cなどから構成され、フランジ部33aがポールピース32と気密に接合されている。   The metal container 33 includes, for example, an outer flange portion 33a, a tubular portion 33b extending in the extending direction of the tube axis m, an inner bent portion 33c that functions as a high frequency choke, and the flange portion 33a is a pole piece. 32 is airtightly joined.

金属容器33に、高周波チョークとして機能する筒状チョーク構造体34が接合されている。チョーク構造体34の上端はセラミックなどからなる絶縁円筒35に接合されている。絶縁円筒35に封着リング36が接合され、封着リング36に排気管37が封着されている。排気管37は金属キャップ38で保護されている。また、出力部を構成する出力アンテナ39の一端が排気管37に接続されている。出力アンテナ39の他端は絶縁円筒35などの内側空間を通り、さらにポールピース32の透孔32bを通って陽極円筒30の内側まで伸び、陽極ベイン31の1つに接続されている。   A cylindrical choke structure 34 that functions as a high-frequency choke is joined to the metal container 33. The upper end of the choke structure 34 is joined to an insulating cylinder 35 made of ceramic or the like. A sealing ring 36 is joined to the insulating cylinder 35, and an exhaust pipe 37 is sealed to the sealing ring 36. The exhaust pipe 37 is protected by a metal cap 38. In addition, one end of the output antenna 39 constituting the output unit is connected to the exhaust pipe 37. The other end of the output antenna 39 passes through the inner space such as the insulating cylinder 35, further extends through the through hole 32 b of the pole piece 32 to the inside of the anode cylinder 30, and is connected to one of the anode vanes 31.

ポールピース32の管軸m方向における図示上方、たとえば金属容器33のフランジ部33a上方にリング状永久磁石40が配置されている。永久磁石40の管軸m方向における図示上方に、磁気回路の一部を形成するヨーク41が配置されている。ヨーク41は中央に開口41aが設けられ、その開口41aを、マグネトロンの真空容器部分を構成するたとえばチョーク構造体34や絶縁円筒35の部分が貫通している。また、ヨーク41と永久磁石40との間に、磁性材料のリング状シム板42が挟まれている。   A ring-shaped permanent magnet 40 is disposed above the pole piece 32 in the direction of the tube axis m, for example, above the flange portion 33 a of the metal container 33. A yoke 41 that forms part of the magnetic circuit is disposed above the permanent magnet 40 in the direction of the tube axis m. The yoke 41 is provided with an opening 41a in the center, and a portion of, for example, a choke structure 34 or an insulating cylinder 35 that constitutes a vacuum container portion of the magnetron passes through the opening 41a. A ring-shaped shim plate 42 made of a magnetic material is sandwiched between the yoke 41 and the permanent magnet 40.

シム板42は、その内側部分に管軸mと平行に突出する突出部42aが環状に形成され、また、突出部42aから下方に伸びる筒状端部42bが金属容器33の筒状部33bに接合されている。そして、ヨーク41の開口41a部分の内側面とシム板42の突出部42aとの間にリング状の導電ガスケット43が嵌め込まれている。この場合、ヨーク41の開口41a部分の内側面に段差41bを設け、その段差41bで形成された凹部空間に導電ガスケット43の一部を押し込み、導電ガスケット43が脱落しないようにしている。   The shim plate 42 is formed with an annular protrusion 42 a that protrudes in parallel with the tube axis m on the inner side of the shim plate 42, and a cylindrical end 42 b that extends downward from the protrusion 42 a on the cylindrical portion 33 b of the metal container 33. It is joined. A ring-shaped conductive gasket 43 is fitted between the inner side surface of the opening 41 a portion of the yoke 41 and the protruding portion 42 a of the shim plate 42. In this case, a step 41b is provided on the inner side surface of the opening 41a portion of the yoke 41, and a part of the conductive gasket 43 is pushed into the recessed space formed by the step 41b so that the conductive gasket 43 does not fall off.

上記した構成のマグネトロンは、電子レンジなどに組み込む場合、マイクロ波出力部、たとえばヨーク41から突出する部分を導波管内に挿入し、たとえばヨーク41と導波管をネジなどで固定する。このとき、0.1mm程度の金属線を編み込んだ弾力性のある導電ガスケット43が導波管に接触し、マイクロ波の漏洩が防止される。   When the magnetron having the above-described configuration is incorporated into a microwave oven or the like, a microwave output portion, for example, a portion protruding from the yoke 41 is inserted into the waveguide, and the yoke 41 and the waveguide are fixed with screws or the like, for example. At this time, an elastic conductive gasket 43 braided with a metal wire of about 0.1 mm comes into contact with the waveguide, and microwave leakage is prevented.

上記した構成のマグネトロンは特許文献1などに開示されている。
特開平4−368750号公報
A magnetron having the above-described configuration is disclosed in Patent Document 1 and the like.
JP-A-4-368750

従来のマグネトロンは、マイクロ波の漏洩を防止するために、ヨーク41の開口41aに導電ガスケットを圧入し、導電ガスケット43と導波管を電気的に接触させている。このとき、導電ガスケット43が外れないように、ヨーク41に設けた開口41a部分の内側面に段差41aを設け、その段差41aで形成された凹部空間に導電ガスケット43の一部を押し込んでいる。   In the conventional magnetron, in order to prevent leakage of microwaves, a conductive gasket is press-fitted into the opening 41a of the yoke 41, and the conductive gasket 43 and the waveguide are in electrical contact. At this time, a step 41a is provided on the inner surface of the opening 41a provided in the yoke 41 so that the conductive gasket 43 does not come off, and a part of the conductive gasket 43 is pushed into the recessed space formed by the step 41a.

しかし、導電ガスケット43は、ヨーク41の開口41a部分に単に圧入する構造であるため、製造過程や輸送途中の振動などで脱落する場合がある。   However, since the conductive gasket 43 has a structure that is simply press-fitted into the opening 41a portion of the yoke 41, the conductive gasket 43 may fall off due to vibration during the manufacturing process or transportation.

本発明は、上記した欠点を解決し、導電ガスケットの脱落を防止したマグネトロンを提供することを目的とする。   An object of the present invention is to provide a magnetron that solves the above-described drawbacks and prevents the conductive gasket from falling off.

本発明は、出力アンテナが真空容器部分の内側空間を管軸方向に伸びるマイクロ波出力部と、前記真空容器部分の外側に配置した永久磁石と、前記マイクロ波出力部が開口部分を貫通するヨークと、前記永久磁石と前記ヨークとの間に位置するシム板と、前記ヨークの開口部分に配置した導電ガスケットとを具備したマグネトロンにおいて、前記シム板と前記導電ガスケットとを溶接したことを特徴とする。   The present invention relates to a microwave output portion in which an output antenna extends in an inner space of a vacuum vessel portion in a tube axis direction, a permanent magnet disposed outside the vacuum vessel portion, and a yoke in which the microwave output portion passes through an opening portion. A magnet plate including a shim plate positioned between the permanent magnet and the yoke, and a conductive gasket disposed in an opening of the yoke, wherein the shim plate and the conductive gasket are welded. To do.

本発明によれば、導電ガスケットとシム板を溶接し、導電ガスケットをシム板に固定しているため、製造過程や輸送途中の振動などによって導電ガスケットが脱落しないマグネトロンが実現される。   According to the present invention, since the conductive gasket and the shim plate are welded and the conductive gasket is fixed to the shim plate, a magnetron is realized in which the conductive gasket does not fall off due to vibration during the manufacturing process or transportation.

本発明の実施形態について、その主要部を抜き出して示した図1の断面図を参照して説明する。   An embodiment of the present invention will be described with reference to the cross-sectional view of FIG.

符号10は発振部本体を構成する陽極円筒で、陽極円筒10の内側空間に複数の陽極ベイン11や陰極(図示せず)が配置されている。また陽極円筒10の端部開口部分にポールピース12が設けられている。ポールピース12は管軸m上に開口12aが設けられ、管軸mからずれた位置に透孔12bが形成されている。ポールピース12の図示上方に筒状金属容器13が配置されている。   Reference numeral 10 denotes an anode cylinder constituting the oscillating unit main body, and a plurality of anode vanes 11 and cathodes (not shown) are arranged in an inner space of the anode cylinder 10. A pole piece 12 is provided at the end opening of the anode cylinder 10. The pole piece 12 is provided with an opening 12a on the tube axis m, and a through hole 12b is formed at a position shifted from the tube axis m. A cylindrical metal container 13 is disposed above the pole piece 12 in the figure.

金属容器13は、たとえば外側に広がるフランジ部13aおよび管軸mの延長方向に伸びる筒状部13b、高周波チョークとして機能する内側に折れ曲がった折曲部13cなどから構成され、フランジ部13aがポールピース12に気密に接合されている。   The metal container 13 includes, for example, a flange portion 13a that spreads outward, a cylindrical portion 13b that extends in the extending direction of the tube axis m, a bent portion 13c that functions as a high-frequency choke, and the flange portion 13a is a pole piece. 12 is airtightly joined.

金属容器13に、高周波チョークとして機能する筒状チョーク構造体14が接合されている。チョーク構造体14の上端はセラミックなどからなる絶縁円筒15に接合されている。絶縁円筒15に封着リング16が接合され、封着リング16に排気管17が封着されている。排気管17は金属キャップ18で保護されている。また、出力部を構成する出力アンテナ19の一端が排気管17に接続されている。出力アンテナ19の他端は絶縁円筒15などの内側空間を通り、さらにポールピース12の透孔12bを通って陽極円筒11の内側まで伸び、陽極ベイン11の1つに接続されている。   A cylindrical choke structure 14 that functions as a high-frequency choke is joined to the metal container 13. The upper end of the choke structure 14 is joined to an insulating cylinder 15 made of ceramic or the like. A sealing ring 16 is joined to the insulating cylinder 15, and an exhaust pipe 17 is sealed to the sealing ring 16. The exhaust pipe 17 is protected by a metal cap 18. In addition, one end of the output antenna 19 constituting the output unit is connected to the exhaust pipe 17. The other end of the output antenna 19 passes through the inner space such as the insulating cylinder 15, further extends through the through hole 12 b of the pole piece 12 to the inside of the anode cylinder 11, and is connected to one of the anode vanes 11.

上記の金属容器13やチョーク構造体14、絶縁円筒15、封着リング16、排気管17はマグネトロンの真空容器の一部を構成している。   The metal container 13, the choke structure 14, the insulating cylinder 15, the sealing ring 16, and the exhaust pipe 17 constitute a part of a magnetron vacuum container.

ポールピース12の管軸m方向における図示上方、たとえば真空容器部分の外側で金属容器13のフランジ部13a上方に、リング状永久磁石20が配置されている。また、永久磁石20の管軸m方向における図示上方に、磁気回路を形成するヨーク21が配置されている。図1では、ヨーク21の一部だけが示されている。   A ring-shaped permanent magnet 20 is arranged above the pole piece 12 in the direction of the tube axis m, for example, outside the vacuum vessel portion and above the flange portion 13a of the metal vessel 13. A yoke 21 that forms a magnetic circuit is disposed above the permanent magnet 20 in the direction of the tube axis m. In FIG. 1, only a part of the yoke 21 is shown.

ヨーク21は中央に開口21aが設けられ、その開口21a部分を、真空容器を構成するたとえばチョーク構造体14や絶縁円筒15が貫通している。また、ヨーク21と永久磁石20との間に、磁性体からなるリング状シム板22が挟まれている。   The yoke 21 is provided with an opening 21a at the center, and the opening 21a is penetrated by, for example, a choke structure 14 or an insulating cylinder 15 constituting a vacuum vessel. A ring-shaped shim plate 22 made of a magnetic material is sandwiched between the yoke 21 and the permanent magnet 20.

シム板22は、その内側部分に管軸m方向に突出する突出部22aが環状に形成され、また、突出部22aから下方に伸びる筒状端部22bが金属容器13の筒状部13bに接合されている。そして、ヨーク21の開口21a部分の内側面とシム板22の突出部22aとの間に、たとえば0.1mm程度の金属線を編み込んだ弾力性のあるリング状導電ガスケット23が嵌め込まれている。このとき、導電ガスケット23が脱落しないように、ヨーク21の開口21a部分の内側面に段差21bを設け、その段差21bによって形成された凹んだ空間部分に導電ガスケット23の一部を押し込んでいる。また、同時に、シム板22の複数箇所、たとえば4〜8個所に溶接用突起22aを設け、シム板22と導電ガスケット23をプロジェクシヨン溶接している。   The shim plate 22 is formed with an annular projection 22a projecting in the tube axis m direction at the inner portion thereof, and a cylindrical end 22b extending downward from the projection 22a is joined to the cylindrical portion 13b of the metal container 13. Has been. Then, between the inner side surface of the opening 21a portion of the yoke 21 and the protruding portion 22a of the shim plate 22, an elastic ring-shaped conductive gasket 23 in which a metal wire of about 0.1 mm, for example, is fitted is fitted. At this time, a step 21b is provided on the inner side surface of the opening 21a portion of the yoke 21 so that the conductive gasket 23 does not fall off, and a part of the conductive gasket 23 is pushed into the recessed space formed by the step 21b. At the same time, welding protrusions 22a are provided at a plurality of locations on the shim plate 22, for example, 4 to 8 locations, and the shim plate 22 and the conductive gasket 23 are projection welded.

ここで、シム板22と導電ガスケット23の溶接箇所の一例を図で説明する。図2は、図1に対応する部分に同じ符号を付し重複する説明を一部省略する。   Here, an example of the welding location of the shim plate 22 and the conductive gasket 23 will be described with reference to the drawings. In FIG. 2, parts corresponding to those in FIG.

図2は8個所で溶接した場合で、溶接箇所を十字部分の交点a〜hで示している。たとえば4個の溶接箇所a〜dは導電ガスケット23の外縁に近い1つの円周上に等間隔に設けられている。残りの4個の溶接箇所e〜hは、たとえば導電ガスケット23の内縁に近い1つの円周上に等間隔に、かつ、溶接箇所a〜dと半径方向で重ならない位置に設けられている。   FIG. 2 shows a case where welding is performed at eight locations, and the welding locations are indicated by cross points a to h. For example, four welding locations a to d are provided at equal intervals on one circumference close to the outer edge of the conductive gasket 23. The remaining four welding locations e to h are provided, for example, on one circumference close to the inner edge of the conductive gasket 23 at equal intervals and at positions that do not overlap with the welding locations a to d in the radial direction.

上記した構成によれば、導電ガスケットとシム板が溶接されている。そのため、製造過程や輸送途中の振動などで導電ガスケットが脱落するようなことがなくなる。また、導電ガスケットの脱落で発生するマイクロ波の漏洩が防止され、安全性の高いマグネトロンが得られる。   According to the above configuration, the conductive gasket and the shim plate are welded. Therefore, the conductive gasket does not fall off due to vibration during the manufacturing process or transportation. Further, leakage of microwaves generated when the conductive gasket is removed is prevented, and a highly safe magnetron can be obtained.

本発明の実施形態を説明するための一部断面図である。It is a partial sectional view for explaining an embodiment of the present invention. 本発明による溶接箇所を説明するための上面図である。It is a top view for demonstrating the welding location by this invention. 従来例を説明するための一部断面図である。It is a partial cross section figure for demonstrating a prior art example.

符号の説明Explanation of symbols

10…陽極円筒
11…陽極ベイン
12…ポールピース
13…金属容器
14…チョーク構造体
15…絶縁円筒
16…封着リング
17…排気管
18…金属キャップ
19…出力アンテナ
20…永久磁石
21…ヨーク
21a…ヨークの開口
22…シム板
23…導電ガスケット
DESCRIPTION OF SYMBOLS 10 ... Anode cylinder 11 ... Anode vane 12 ... Pole piece 13 ... Metal container 14 ... Choke structure 15 ... Insulating cylinder 16 ... Sealing ring 17 ... Exhaust pipe 18 ... Metal cap 19 ... Output antenna 20 ... Permanent magnet 21 ... Yoke 21a ... Yoke opening 22 ... Shim plate 23 ... Conductive gasket

Claims (2)

出力アンテナが真空容器部分の内側空間を管軸方向に伸びるマイクロ波出力部と、前記真空容器部分の外側に配置した永久磁石と、前記マイクロ波出力部が開口部分を貫通するヨークと、前記永久磁石と前記ヨークとの間に位置するシム板と、前記ヨークの開口部分に配置した導電ガスケットとを具備したマグネトロンにおいて、前記シム板と前記導電ガスケットとを溶接したことを特徴とするマグネトロン。   A microwave output portion in which an output antenna extends in an inner space of the vacuum vessel portion in the tube axis direction, a permanent magnet disposed outside the vacuum vessel portion, a yoke in which the microwave output portion penetrates an opening portion, and the permanent A magnetron comprising a shim plate positioned between a magnet and the yoke, and a conductive gasket disposed in an opening of the yoke, wherein the shim plate and the conductive gasket are welded. シム板と導電ガスケットとの溶接は、前記シム板の前記導電ガスケットとの溶接箇所に突起を設けたプロジェクション溶接である請求項1記載のマグネトロン。   The magnetron according to claim 1, wherein the welding of the shim plate and the conductive gasket is projection welding in which a protrusion is provided at a welding portion of the shim plate with the conductive gasket.
JP2004004063A 2004-01-09 2004-01-09 Magnetron Expired - Lifetime JP3738261B2 (en)

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JP5425577B2 (en) * 2009-09-25 2014-02-26 東芝ホクト電子株式会社 Microwave oven and magnetron for microwave oven

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