JPS60193237A - Cathode structure of magnetron - Google Patents
Cathode structure of magnetronInfo
- Publication number
- JPS60193237A JPS60193237A JP2620385A JP2620385A JPS60193237A JP S60193237 A JPS60193237 A JP S60193237A JP 2620385 A JP2620385 A JP 2620385A JP 2620385 A JP2620385 A JP 2620385A JP S60193237 A JPS60193237 A JP S60193237A
- Authority
- JP
- Japan
- Prior art keywords
- end shield
- shield
- diameter portion
- center support
- magnetron
- 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.)
- Pending
Links
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
- H01J23/02—Electrodes; Magnetic control means; Screens
- H01J23/04—Cathodes
- H01J23/05—Cathodes having a cylindrical emissive surface, e.g. cathodes for magnetrons
Landscapes
- Microwave Tubes (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は電子レンジ用マグネトロンの陰極構体に関する
ものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a cathode structure for a magnetron for a microwave oven.
近時、電子レンジは民生用として広く晋及しつつあり、
この電子レンジの主要部を１３成するのがマグネトロン
である。このような民生用のマグネトロンは、量産性を
有すると共に、部品コストが極力低く、しかも特性が均
一であることが必要である。Recently, microwave ovens have become widespread for consumer use.
The main part of this microwave oven is the magnetron. Such magnetrons for consumer use must be mass-producible, have as low a component cost as possible, and have uniform characteristics.
第１図は前記のような目的で製造されている従来のマグ
ネトロンの陽極構体の１例を示すものである。図におい
て、１はＴｈ−Ｗ（トリウム−タングステン）線をら線
状に巻回してなる陰極で、上端には上エンドシールド２
が、また下端には下エンドシールド３がろう付けまたは
アーク溶接などにより固着されている。上エンドシール
ド２には深穴部２ａが設けられておｐ、この深穴部２ａ
にはＭｏ（モリブデン）製金属棒からなるセンタサポー
ト４の小径部４ａが挿通され、かつ段部４ｂによシ上エ
ンドシールド２が軸方向に位ｆｆｆ決めされ。FIG. 1 shows an example of a conventional magnetron anode structure manufactured for the above purpose. In the figure, 1 is a cathode made by winding a Th-W (thorium-tungsten) wire in a spiral shape, and an upper end shield 2 is attached to the upper end.
However, a lower end shield 3 is fixed to the lower end by brazing or arc welding. The upper end shield 2 is provided with a deep hole 2a.
A small-diameter portion 4a of a center support 4 made of a metal rod made of Mo (molybdenum) is inserted through the center support 4, and the upper end shield 2 is positioned in the axial direction by the stepped portion 4b.
上エンドシールド２と下エンドシールド３の間隔Ｈが所
定の寸法に精度良く組立可能なようになっている。下エ
ンドシールド３はサイドサポート５に溶接固着され、ま
たセンタサポート４およびナイドサポート５はセラミッ
ク製のｔ３縁体６に設けられた穴６ａに挿通され、金属
ワッシャ７ｆ：介し絶縁体６の下端に気密的にろ９付け
されている。The interval H between the upper end shield 2 and the lower end shield 3 can be accurately assembled to a predetermined dimension. The lower end shield 3 is welded and fixed to the side support 5, and the center support 4 and the nide support 5 are inserted into a hole 6a provided in the ceramic T3 edge 6. It is airtightly sealed.
絶縁体６の上端には薄板製の金属病体８がろう付けされ
、更にこの金属構体８は図示省略した陽極に固着される
。A metal structure 8 made of a thin plate is brazed to the upper end of the insulator 6, and this metal structure 8 is further fixed to an anode (not shown).
このような構成よｐなる従来の陰極ｈｑ体は、センタサ
ポート４の端部に小径部４ａを設けるために切削加工を
必要とするが、センタサポート４は通常、極めて加工し
にくい材質であるＭｏ’ＰＷ１ｊ！で形成されているの
で、加工費用が高く、また切削加工時のバイトの摩耗も
涼しく、量産性に乏しいという欠泣を有していた。また
上エンドシールド２にはセンタサポート４の小径部４ａ
ＶＣ適合する小径の深穴部２ａを必要とするが、小径の
深穴を精度よく加工することは困難なことであシ、精度
上およびコスト上不利でちった。A conventional cathode hq body with such a configuration requires cutting to provide the small diameter portion 4a at the end of the center support 4, but the center support 4 is usually made of Mo, which is a material that is extremely difficult to process. 'PW1j! Since it is made of aluminum, the processing cost is high, and the cutting tool wears slowly during cutting, making it difficult to mass-produce. Also, the small diameter portion 4a of the center support 4 is attached to the upper end shield 2.
Although a small-diameter deep hole 2a that is compatible with the VC is required, it is difficult to accurately machine the small-diameter deep hole, which is disadvantageous in terms of accuracy and cost.
本発明は上記従来技術の欠点を解消し、加工容易かつ安
価で、しかも高精度で量産可能な′電子レンジ用マグネ
トロン陰ｔＩ／ｉｔｆ’７体を提供することを目的とす
る。It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and to provide a magnetron tI/itf for microwave ovens that is easy to process, inexpensive, and mass-producable with high precision.
マグネトロン陰極構体の支持金玩俸に保持する上エンド
シールドの嵌着部分に段部全、粉末プレス成形すること
により、精度よく容易に加工を可能にするものである。The entire stepped part is powder press molded to the fitting part of the upper end shield held on the support metal part of the magnetron cathode structure, making it possible to process it easily and with high precision.
以下、本発明を図示の実施例によシ説明する。 Hereinafter, the present invention will be explained with reference to illustrated embodiments.
第２図は本発明の一実施例の要部を示し、細線をら線状
に巻回してなる陰極！ｌの上端部を保持する上エンドシ
ールド１２は円形のフランジ部１２ａとボス部１２ｂと
を有し、中心部に大径部１３ａ、小径部１３ｂおよび段
部１３ｃからなる貫通穴部を設け、上エンドシールド１
２を保持するセンタサボー）１４￥ｃ−その上端部が上
エンドシールド１２の貫通穴部の段部１３Ｃに突当るま
で大径ｍ １３ ａに挿入し、上エンドシールド１２と
センタサボ−）１４との相互位置を定め得るように形成
されている。FIG. 2 shows the main part of an embodiment of the present invention, in which a cathode is formed by winding a thin wire in a spiral shape! The upper end shield 12 that holds the upper end of the l has a circular flange portion 12a and a boss portion 12b, and a through hole portion consisting of a large diameter portion 13a, a small diameter portion 13b, and a stepped portion 13c is provided in the center. end shield 1
2 (center sabot) 14￥c - insert it into the large diameter m13a until its upper end hits the step 13C of the through hole of the upper end shield 12, and connect the upper end shield 12 and center sabot) 14. They are configured to be reciprocally positionable.
このように、センタサポート１４に段部を設ける必要が
ないので、量産性が高く安価に製造できる。また上エン
ドシールド１２に設けられた小径部１３ｂは単なるスト
ッパーの役目をするためのものであり、その穴精度はＭ
要でなく、加工深さも小さいので加工が容易である。一
方、大径部１３ａの径が大きいので精度よく加工できる
。また、上エンドシールド１２はＭＯ粉末をプレス成形
後焼成する方式で加工できるので、内径が異なる２段穴
の加工は少しも困難でない。更に、上エンドシールド１
２の小径部１３ｂに几ｕ −Ｍ ｏろうなどを挿入して
上エンドシールド１２とセンタサボー）１４とをろう付
けできるので、ろう材の位置決めが確実にでき、ろう付
は時の搬送に伴う振動でろう材が脱落する恐れがない。In this way, since there is no need to provide the center support 14 with a stepped portion, mass productivity is high and manufacturing is possible at low cost. Further, the small diameter portion 13b provided in the upper end shield 12 is simply to serve as a stopper, and its hole accuracy is M.
It is easy to process because it does not require much work and the processing depth is small. On the other hand, since the large diameter portion 13a has a large diameter, it can be processed with high precision. Further, since the upper end shield 12 can be processed by press-molding MO powder and then firing it, it is not difficult at all to process two-stage holes with different inner diameters. Furthermore, upper end shield 1
Since the upper end shield 12 and the center sabot (14) can be brazed by inserting a solder, etc. into the small diameter portion 13b of 2, the brazing material can be positioned reliably, and brazing can be done without vibration caused by transportation. There is no risk of the brazing material falling off.
また更に、凹部にろう材を置く構造なので、ろう材とし
て粉末状、ペースト状、線状などいずれの性状のものを
もイ吏用できるなど数多くの利点を有する。Furthermore, since the brazing material is placed in the recess, it has many advantages, such as being able to use any type of brazing material, such as powder, paste, or wire.
第３因は本発明の他の実力６例を示し、上エンドシール
ド１５の段部１６ｃと小径部１６ｂｔ″テーパ状に形成
したものである。大径部１６ａに挿入されるセンタサポ
ートハテーノく状の小径１１１６ｂの下部の段部１６Ｃ
で位置決めされる。このように形成しても、前記実施例
と同様な効果が得られる。The third factor shows six other practical examples of the present invention, in which the step portion 16c and the small diameter portion 16b of the upper end shield 15 are formed into a tapered shape. The lower step portion 16C of the small diameter 1116b of the shape
is positioned. Even if formed in this way, the same effects as in the embodiment described above can be obtained.
以上の説明から明らかな如く、本発明によれば、従来に
比し製造コストを大幅に低減でき、かつ高精度で特性が
均一なマグネトロンの陰極溝体を容易に得ることができ
る。As is clear from the above description, according to the present invention, manufacturing costs can be significantly reduced compared to conventional methods, and a magnetron cathode groove body with high precision and uniform characteristics can be easily obtained.
第１図は従来のマグネトロン陰極６り体の縦断面図、第
２図は本発明になるマグネトロン陰極病体の１実施例を
示す要部縦断面図、第３図は本発明の他の実施例を示す
上エンドシールドの縦断面図である。
１１・・・・１１３ｉｔ１２．１５・・・・上エンドシ
ールド、１３ａ、１６ ａ−大径部、１３ｂ、ｌ ６
ｂ、、−、小径部、１３ｃ、１６ ｃ−段部、１４−
センタサポート。
第１図
竺２図 第３図FIG. 1 is a vertical sectional view of a conventional six-piece magnetron cathode body, FIG. 2 is a longitudinal sectional view of essential parts showing one embodiment of the magnetron cathode body according to the present invention, and FIG. 3 is another embodiment of the present invention. FIG. 3 is a vertical cross-sectional view of the upper end shield. 11...113it12.15...Top end shield, 13a, 16 a-large diameter part, 13b, l 6
b,, -, small diameter part, 13c, 16 c-step part, 14-
Center support. Figure 1 Figure 2 Figure 3
Claims (1)
ルドおよび下エンドシールドを配設し、前記上エンドシ
ールドに貫通穴部を設け、この貫通穴部に支持用金属棒
を挿入して前記陰極を支持しかつ通電する情造のマグネ
トロン陰極構体において、前記上エンドシールドに設け
た貫通穴部は大径部、小径部および大径部と小径部の連
接部に形成した段部を有し、前記支持用金属棒の端部が
前記上エンドシールドの貫通穴の段部に突当るまで大径
部に挿入し、上エンドシールドと支持用金属棒との相互
位置が定まるようにしたことを特徴とするマグネトロン
陰極構体。。 ２、 上エンドシールドは粉末プレス焼成によシ形成さ
れたことを特徴とする特許請求の範囲第１項記載のマグ
ネトロン陰極構体。[Claims] 1. An upper end shield and a lower end shield are provided at both upper and lower ends in the axial direction of a spiral cathode, a through hole is provided in the upper end shield, and a support hole is provided in the through hole. In the magnetron cathode structure in which a metal rod is inserted to support and energize the cathode, the through hole portion provided in the upper end shield is formed in a large diameter portion, a small diameter portion, and a connecting portion between the large diameter portion and the small diameter portion. The end of the supporting metal rod is inserted into the large diameter portion until it hits the step of the through hole of the upper end shield, and the mutual position of the upper end shield and the supporting metal rod is adjusted. A magnetron cathode structure characterized in that: . 2. The magnetron cathode structure according to claim 1, wherein the upper end shield is formed by powder press firing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2620385A JPS60193237A (en) | 1985-02-15 | 1985-02-15 | Cathode structure of magnetron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2620385A JPS60193237A (en) | 1985-02-15 | 1985-02-15 | Cathode structure of magnetron |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60193237A true JPS60193237A (en) | 1985-10-01 |
Family
ID=12186907
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2620385A Pending JPS60193237A (en) | 1985-02-15 | 1985-02-15 | Cathode structure of magnetron |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60193237A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100774469B1 (en) | 2006-01-05 | 2007-11-08 | 엘지전자 주식회사 | Magnetron for microwave oven |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51872A (en) * | 1974-06-20 | 1976-01-07 | Matsushita Electronics Corp | |
| JPS5116246B2 (en) * | 1971-11-29 | 1976-05-22 |
-
1985
- 1985-02-15 JP JP2620385A patent/JPS60193237A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5116246B2 (en) * | 1971-11-29 | 1976-05-22 | ||
| JPS51872A (en) * | 1974-06-20 | 1976-01-07 | Matsushita Electronics Corp |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100774469B1 (en) | 2006-01-05 | 2007-11-08 | 엘지전자 주식회사 | Magnetron for microwave oven |
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