JPS6117332B2 - - Google Patents
Info
- Publication number
- JPS6117332B2 JPS6117332B2 JP15495478A JP15495478A JPS6117332B2 JP S6117332 B2 JPS6117332 B2 JP S6117332B2 JP 15495478 A JP15495478 A JP 15495478A JP 15495478 A JP15495478 A JP 15495478A JP S6117332 B2 JPS6117332 B2 JP S6117332B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic pole
- magnets
- yoke
- magnetron
- magnet
- 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
Links
- 239000000696 magnetic material Substances 0.000 claims description 7
- 229910000859 α-Fe Inorganic materials 0.000 description 10
- 230000004907 flux Effects 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 3
- 229910000828 alnico Inorganic materials 0.000 description 2
- 239000010941 cobalt Substances 0.000 description 2
- 229910017052 cobalt Inorganic materials 0.000 description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000012212 insulator Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 229910052761 rare earth metal Inorganic materials 0.000 description 2
- 150000002910 rare earth metals Chemical class 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 1
- -1 manganese aluminum Chemical compound 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
Landscapes
- Microwave Tubes (AREA)
Description
【発明の詳細な説明】
本発明は、電子レンジ等に用いられるマグネト
ロンに係り、特にその磁気回路に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetron used in a microwave oven or the like, and particularly to a magnetic circuit thereof.
マグネトロンの磁気回路としては、従来、磁石
を管外に設置するタイプと、管内に設置するタイ
プとがある。 Conventionally, there are two types of magnetron magnetic circuits: one in which the magnet is installed outside the tube, and the other in which the magnet is installed inside the tube.
第１図は磁石を管外に設置するタイプを示す。
１，２は軸方向に磁化されたリング状のフエライ
ト磁石で、互いに異極性側が対向するように配置
されている。両磁石１，２の内側磁極面１ａ，２
ａには、それぞれ中間リング３，４を介して磁極
部材５，６が取付けられている。また、両磁石の
外側磁極面１ｂ，２ｂには、その間を磁気的に結
合するヨーク７が取付けられている。概略的に示
したが、８はマグネトロン管の陽極円筒であり、
９は陰極とベインの間に形成される円筒状の作用
空間である。 Figure 1 shows a type in which the magnet is installed outside the tube.
Reference numerals 1 and 2 are ring-shaped ferrite magnets magnetized in the axial direction, and are arranged so that opposite polarity sides face each other. Inner magnetic pole surfaces 1a, 2 of both magnets 1, 2
Magnetic pole members 5 and 6 are attached to a through intermediate rings 3 and 4, respectively. Furthermore, a yoke 7 is attached to the outer magnetic pole surfaces 1b and 2b of both magnets to magnetically couple them. Although shown schematically, 8 is the anode cylinder of the magnetron tube,
9 is a cylindrical working space formed between the cathode and the vane.
このタイプでは、磁石を管外に設置しているた
め、安価なフエライト磁石を使用することができ
るが、ヨークが大型となるため、マグネトロンは
重く大きくなる欠点がある。 In this type, the magnet is installed outside the tube, so an inexpensive ferrite magnet can be used, but the yoke is large, making the magnetron heavy and bulky.
第２図は磁石を管内に設置するタイプを示す。
１０，１１は軸方向に磁化された磁石、１２，１
３は磁極部材、１４はヨーク、９は作用空間であ
る。ヨーク１４はマグネトロン管の陽極円筒を兼
ねている。したがつて、磁石１０，１１は管内に
設置された構成となる。 Figure 2 shows a type in which the magnet is installed inside the pipe.
10, 11 are magnets magnetized in the axial direction, 12, 1
3 is a magnetic pole member, 14 is a yoke, and 9 is a working space. The yoke 14 also serves as the anode cylinder of the magnetron tube. Therefore, the magnets 10 and 11 are installed inside the pipe.
このタイプでは、ヨークが陽極円筒を兼ねてい
るのでマグネトロンを小型化できる利点はある
が、磁石を10-6〜10-7mmHgという高真空中に設
置することになるため、焼結製品であることから
真空中でガスを放出する性質のあるフエライト磁
石は使用できず、アルニコ系磁石や希土類コバル
ト系磁石のようなガスを放出しない性質の磁石を
使用する必要があり、コスト高となる欠点があ
る。 This type has the advantage of making the magnetron smaller because the yoke also serves as the anode cylinder, but since the magnet is placed in a high vacuum of 10 -6 to 10 -7 mmHg, it is a sintered product. For this reason, ferrite magnets that emit gas in a vacuum cannot be used, and it is necessary to use magnets that do not emit gas, such as alnico magnets or rare earth cobalt magnets, which have the disadvantage of high cost. be.
本発明の目的は、上記した従来技術の欠点を除
き、小形で安価なマグネトロンを提供するにあ
る。 An object of the present invention is to provide a small and inexpensive magnetron that eliminates the drawbacks of the prior art described above.
この目的を達成するため、本発明は、作用空間
をはさんで対向配置された二つの磁石の中心にそ
れぞれ穴を形成し、その二つの磁石を、対向する
内側磁極面間に円筒形のヨークを介して磁気的に
結合し、且つ、前記二つの磁石の外側磁極面に
は、それぞれ、その外側磁極面から前記穴を通り
前記作用空間へ向つて延びる磁極部材を取付け、
さらに、前記ヨークの内面と前記各磁極部材との
間をそれぞれ非磁性材からなる気密壁により密封
して前記ヨーク、各磁極部材および気密壁などで
真空管を構成し、前記二つの磁石をこの真空管の
外部に配置したことを特徴とする。 In order to achieve this object, the present invention forms a hole in the center of two magnets that are placed opposite each other with an action space in between, and connects the two magnets to a cylindrical yoke between opposing inner magnetic pole surfaces. and magnetically coupled to the outer magnetic pole surfaces of the two magnets, each having a magnetic pole member extending from the outer magnetic pole surface through the hole toward the working space,
Further, the inner surface of the yoke and each of the magnetic pole members are sealed by airtight walls made of non-magnetic material, so that the yoke, each magnetic pole member, the airtight wall, etc. constitute a vacuum tube, and the two magnets are connected to the vacuum tube. It is characterized by being placed outside.
以下、本発明の実施例を図面を参照して詳細に
説明する。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
第３図は本発明のマグネトロンに用いられる磁
気回路の基本的な構成を示す。 FIG. 3 shows the basic configuration of a magnetic circuit used in the magnetron of the present invention.
軸方向に磁化された二つの磁石１５，１６は、
互いに異極性側が対向するように所定の間隔をお
いて配置されており、それぞれ中心に穴１５ｃ，
１６ｃを有するリング状の形態となつている。こ
の二つの磁石１５と１６は、相対向する内側磁極
面１５ａ，１６ａ間に円筒形の磁性材からなるヨ
ーク１７を介して相互に結合されている。このヨ
ーク１７は例えば鉄で構成され、マグネトロン管
の陽極円筒を兼ねている。 The two magnets 15 and 16 magnetized in the axial direction are
They are arranged at a predetermined interval so that the opposite polarity sides face each other, and each has a hole 15c in the center.
It has a ring-like shape with 16c. These two magnets 15 and 16 are coupled to each other via a cylindrical yoke 17 made of a magnetic material between opposing inner magnetic pole surfaces 15a and 16a. This yoke 17 is made of iron, for example, and also serves as the anode cylinder of the magnetron tube.
また、両磁石１５，１６の外側磁極面１５ｂ，
１６ｂには、それぞれ、その外側磁極面１５ｂ，
１６ｂから前記穴１５ｃ，１６ｃ内を通り作用空
間９へ向つて延びる磁極部材１８，１９が取付け
られている。 In addition, the outer magnetic pole faces 15b of both magnets 15 and 16,
16b respectively have their outer magnetic pole faces 15b,
Magnetic pole members 18 and 19 are attached that extend from 16b through the holes 15c and 16c toward the working space 9.
このように構成されたマグネトロンの磁気回路
では、下側磁石１６より出た磁束は下側磁極部材
１９を通つて作用空間９に磁界を与え、上側磁極
部材１８に達する。上側磁極部材１８に達した磁
束は上側磁石１５に入り、さらにヨーク１７を通
つて元の下側磁石１６に達する。 In the magnetron magnetic circuit configured in this manner, the magnetic flux emitted from the lower magnet 16 passes through the lower magnetic pole member 19 to apply a magnetic field to the working space 9 and reaches the upper magnetic pole member 18 . The magnetic flux that has reached the upper magnetic pole member 18 enters the upper magnet 15, further passes through the yoke 17, and reaches the original lower magnet 16.
このような構成にすると、ヨークと陽極円筒を
を兼用することができるので、マグネトロンの小
形軽量化がはかれ、また、磁石径を大きくするこ
とができるので、フエライト磁石のような磁束密
度の低い磁石でも使用することが可能となる。 With this configuration, the yoke and anode cylinder can be used as both, making the magnetron smaller and lighter.Also, since the magnet diameter can be increased, it is possible to use a magnetron with a low magnetic flux density such as a ferrite magnet. It is also possible to use magnets.
第４図は、上記のような磁気回路を用いた本発
明に係るマグネトロンの一実施例を示す。 FIG. 4 shows an embodiment of a magnetron according to the present invention using a magnetic circuit as described above.
符号は第３図と同様で、１５は上側磁石、１６
は下側磁石、１７は陽極円筒を兼ねたヨーク、１
８は上側磁極部材、１９は下側磁極部材である。 The symbols are the same as in Fig. 3, 15 is the upper magnet, 16
is the lower magnet, 17 is the yoke that also serves as the anode cylinder, 1
8 is an upper magnetic pole member, and 19 is a lower magnetic pole member.
ヨーク１７の内側には空洞共振器を構成するベ
イン２０が取付けられ、さらにその中心にヒータ
からなる陰極２１が設置されている。このベイン
２０と陰極２１との間が作用空間９である。陰極
２１の支持体兼給電体２２は、下側磁極部材１９
の中心の穴１９ａを通つて下側磁極部材１９の下
方に突出し、セラミツク絶縁体２３，２４を介し
て下側磁極部材１９に取付けられている。２５，
２６は陰極２１の給電端子である。これら、給電
端子２５，２６、セラミツク絶縁体２３，２４、
下側磁極部材１９の各接合部は充分な気密性をも
つて接合されている。下側磁極部材１９の下部に
は、上記給電端子２５，２６を包囲するようにシ
ールドケース２７が設けられている。 A vane 20 constituting a cavity resonator is attached to the inside of the yoke 17, and a cathode 21 consisting of a heater is further installed at the center of the vane 20. The working space 9 is located between the vane 20 and the cathode 21 . The support body and power supply body 22 of the cathode 21 is the lower magnetic pole member 19
It protrudes below the lower magnetic pole member 19 through a central hole 19a, and is attached to the lower magnetic pole member 19 via ceramic insulators 23 and 24. 25,
26 is a power supply terminal for the cathode 21. These, power supply terminals 25, 26, ceramic insulators 23, 24,
Each joint of the lower magnetic pole member 19 is joined with sufficient airtightness. A shield case 27 is provided at the bottom of the lower magnetic pole member 19 so as to surround the power supply terminals 25 and 26.
また、ベイン２０には高周波電力を取り出すア
ンテナ２８が取付けられ、このアンテナ２８は上
側磁極部材１８に形成された穴１８ａを通つて真
空封止部２９に至つている。真空封止部２９はセ
ラミツク円筒３０及びアダプタリング３を介して
上側磁極部材１８の上面に気密に取付けられてい
る。 Further, an antenna 28 for extracting high frequency power is attached to the vane 20, and this antenna 28 reaches a vacuum sealing portion 29 through a hole 18a formed in the upper magnetic pole member 18. The vacuum sealing portion 29 is airtightly attached to the upper surface of the upper magnetic pole member 18 via a ceramic cylinder 30 and an adapter ring 3.
この実施例では、磁石１５，１６としてフエラ
イト磁石を用いており、このフエライト磁石の放
出ガス管内に入らないようにするため、上側磁極
部材１８とヨーク１７との間及び下側磁極部材１
９とヨーク１７との間は、非磁性材からなる気密
壁３２，３３で密封されている。なお、図示を省
略したが、ヨーク１７の外周面には放熱フインが
取付けられる。 In this embodiment, ferrite magnets are used as the magnets 15 and 16, and in order to prevent gas from entering the emitted gas pipe of the ferrite magnets, the space between the upper magnetic pole member 18 and the yoke 17 and the lower magnetic pole member 1
The space between the yoke 9 and the yoke 17 is sealed with airtight walls 32 and 33 made of a non-magnetic material. Although not shown in the drawings, heat dissipation fins are attached to the outer peripheral surface of the yoke 17.
このようなマグネトロンにおいては、上側磁極
部材１８と下側磁極部材１９とにより陰極２１と
ベイン２０の間の作用空間９に磁束が与えられ、
この状態で、ヨーク１７（陽極円筒）と陰極２１
との間に電圧を加えると、直流電力が高周波電力
に変換され、その高周波電力はアンテナ２８から
外部に取出される。 In such a magnetron, magnetic flux is applied to the working space 9 between the cathode 21 and the vane 20 by the upper magnetic pole member 18 and the lower magnetic pole member 19,
In this state, the yoke 17 (anode cylinder) and the cathode 21
When a voltage is applied between them, the DC power is converted to high frequency power, and the high frequency power is taken out from the antenna 28 to the outside.
上記実施例では、円筒形のヨーク１７が陽極円
筒を兼ねたものを説明したが、陽極円筒はヨーク
とは別に設けてもよい。ただその場合でも、陽極
円筒とヨークは放熱を良好にするため密着させて
おくことが望ましい。 In the above embodiment, the cylindrical yoke 17 also serves as the anode cylinder, but the anode cylinder may be provided separately from the yoke. However, even in that case, it is desirable to keep the anode cylinder and yoke in close contact with each other in order to improve heat radiation.
また、上記実施例では、下側磁石１６はシール
ドケース２７の外に設けたが、マグネトロンの高
さを低くすることが要求されるときは、下側磁石
をシールドケース内に設けることも可能である。
このようにすると、マグネトロンの高さはおよそ
10mm低くすることができ、小型化には好都合であ
る。 Furthermore, in the above embodiment, the lower magnet 16 is provided outside the shield case 27, but if the height of the magnetron is required to be lowered, the lower magnet 16 may be provided inside the shield case. be.
In this way, the height of the magnetron is approximately
It can be lowered by 10mm, which is convenient for miniaturization.
また、上記実施例では、磁石１５，１６として
フエライト磁石を使用したが、これ以外にも、マ
ンガンアルミ磁石、希土類コバルト磁石、アルニ
コ系磁石等も必要に応じて用いることができる。
ただ、フエライト磁石は価格が安い点で有利であ
る。 Further, in the above embodiment, ferrite magnets are used as the magnets 15 and 16, but other than these, manganese aluminum magnets, rare earth cobalt magnets, alnico magnets, etc. can also be used as necessary.
However, ferrite magnets have the advantage of being cheap.
ところで、本発明においては、磁石の外周部が
露出するため、マグネトロンに鉄などの磁性材を
近づけると、磁石から、その磁性材に磁束が漏
れ、作用空間の磁界の強さが若干低下することが
考えられる。これを防止するには次のような手段
をとるとよい。 By the way, in the present invention, since the outer periphery of the magnet is exposed, when a magnetic material such as iron is brought close to the magnetron, magnetic flux leaks from the magnet to the magnetic material, causing a slight decrease in the strength of the magnetic field in the working space. is possible. To prevent this, the following measures may be taken.
(イ) 下側磁石をシールドケース内に収納する。こ
れにより磁界の変動を小さくすることが可能で
ある。(a) Store the lower magnet in the shield case. This makes it possible to reduce fluctuations in the magnetic field.
(ロ) 第４図に示すように、磁石１５，１６の外径
を磁極部材１８，１９のフランジ部１８ｂ，１
９ｂ及びヨーク１７のフランジ部１７ａ，１７
ａの外径より若干大きくする。フエライト磁石
の透磁率は真空より少し大きい1.1程度である
から、このようにすると、磁石の外周部付近で
若干の磁束の変動があつても作用空間での磁束
密度の変動はほとんどなくなる。(b) As shown in FIG. 4, the outer diameters of the magnets 15 and 16 are
9b and the flange portions 17a, 17 of the yoke 17
Make it slightly larger than the outer diameter of a. Since the magnetic permeability of a ferrite magnet is approximately 1.1, which is slightly higher than that of a vacuum, by doing this, even if there is a slight fluctuation in magnetic flux near the outer periphery of the magnet, there will be almost no fluctuation in magnetic flux density in the working space.
また、本発明においては、磁石の内周部と磁
極部材との間で磁束の漏洩が起きるから、この
漏洩によつて作用空間に与えられる磁束が低下
する可能性があるが、これは、磁石の内径をヨ
ークの内径より若干小さめにして、漏洩分を補
うようにすることで解決できる。 Furthermore, in the present invention, since magnetic flux leaks between the inner peripheral part of the magnet and the magnetic pole member, there is a possibility that the magnetic flux given to the working space decreases due to this leakage. This can be solved by making the inner diameter of the yoke slightly smaller than the inner diameter of the yoke to compensate for the leakage.
以上説明したように本発明によれば、二つの磁
石を磁気的に結合するヨークで陽極円筒を兼ねる
か又はそのヨークと陽極円筒を一体化することが
できるから、マグネトロンの小型軽量化が達成で
きる。また、磁石を管外に配置るので、磁石の材
質に制限がなく、例えば安価なフエライト磁石を
使用でき、安価なマグネトロンを提供することが
できる。さらに、磁石を管内に置かないことか
ら、管内の高真空度を保つことが容易となり、マ
グネトロンの信頼性を向上することができる。 As explained above, according to the present invention, the yoke that magnetically couples two magnets can also serve as the anode cylinder, or the yoke and the anode cylinder can be integrated, making it possible to reduce the size and weight of the magnetron. . Furthermore, since the magnet is placed outside the tube, there are no restrictions on the material of the magnet, and for example, an inexpensive ferrite magnet can be used, making it possible to provide an inexpensive magnetron. Furthermore, since no magnet is placed inside the tube, it is easy to maintain a high degree of vacuum inside the tube, and the reliability of the magnetron can be improved.
第１図及び第２図はそれぞれ従来のマグネトロ
ンの磁気回路を示す縦断面図、第３図は本発明に
係るマグネトロンの磁気回路の基本構成を示す縦
断面図、第４図は本発明の一実施例に係るマグネ
トロンの縦断面図である。
９……作用空間、１５，１６……磁石、１５
ａ，１６ａ……内側磁極面、１５ｂ，１６ｂ……
外側磁極面、１５ｃ，１６ｃ……穴、１７……ヨ
ーク、１７ａ……フランジ部、１８，１９……磁
極部材、１９ｂ……フランジ部、２０……ベイ
ン、２１……陰極、２７……シールドケース、３
２，３３……気密壁。
1 and 2 are longitudinal cross-sectional views showing the magnetic circuit of a conventional magnetron, respectively. FIG. 3 is a longitudinal cross-sectional view showing the basic configuration of the magnetic circuit of a magnetron according to the present invention. FIG. 2 is a longitudinal cross-sectional view of a magnetron according to an example. 9... Working space, 15, 16... Magnet, 15
a, 16a...inner magnetic pole surface, 15b, 16b...
Outer magnetic pole surface, 15c, 16c... hole, 17... yoke, 17a... flange section, 18, 19... magnetic pole member, 19b... flange section, 20... vane, 21... cathode, 27... shield case, 3
2,33...Airtight wall.
Claims (1)
はさんで、軸方向に磁化された二つの磁石を互い
に異極性側が対向するように配置したマグネトロ
ンにおいて、前記二つの磁石は、それぞれ中心に
穴を有するとともに、その内側磁極面間に磁性材
からなる円筒形のヨークを介して磁気的に結合さ
れており、且つ、前記二つの磁石の外側磁極面に
は、それぞれ、その外側磁極面から前記穴を通り
前記作用空間へ向つて延びる磁極部材が取付けら
れており、さらに、前記ヨークの内面と前記各磁
極部材との間はそれぞれ非磁性材からなる気密壁
により密封して前記ヨーク、各磁極部材および気
密壁などで真空管を構成し、前記二つの磁石をこ
の真空管の外部に配置したことを特徴とするマグ
ネトロン。1. In a magnetron in which two axially magnetized magnets are arranged with opposite polarity sides facing each other across an action space formed between a cathode and a vane, each of the two magnets is The two magnets have a hole, and are magnetically coupled to each other through a cylindrical yoke made of a magnetic material between the inner magnetic pole faces thereof, and the outer magnetic pole faces of the two magnets each have a hole from the outer magnetic pole face to the outer magnetic pole face of the two magnets. A magnetic pole member is attached that extends through the hole toward the working space, and further, the inner surface of the yoke and each of the magnetic pole members are sealed by an airtight wall made of a non-magnetic material, so that the yoke and each of the magnetic pole members are sealed. A magnetron characterized in that a vacuum tube is constituted by a magnetic pole member, an airtight wall, etc., and the two magnets are arranged outside the vacuum tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15495478A JPS5583131A (en) | 1978-12-18 | 1978-12-18 | Magnetron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15495478A JPS5583131A (en) | 1978-12-18 | 1978-12-18 | Magnetron |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5583131A JPS5583131A (en) | 1980-06-23 |
| JPS6117332B2 true JPS6117332B2 (en) | 1986-05-07 |
Family
ID=15595537
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15495478A Granted JPS5583131A (en) | 1978-12-18 | 1978-12-18 | Magnetron |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5583131A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02136900U (en) * | 1989-04-21 | 1990-11-15 |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5598441A (en) * | 1979-01-20 | 1980-07-26 | Matsushita Electronics Corp | Magnetron device |
| JP2000156171A (en) * | 1998-11-18 | 2000-06-06 | Matsushita Electronics Industry Corp | Magnetron apparatus and manufacture thereof |
-
1978
- 1978-12-18 JP JP15495478A patent/JPS5583131A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02136900U (en) * | 1989-04-21 | 1990-11-15 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5583131A (en) | 1980-06-23 |
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