JPH0412587Y2 - - Google Patents
Info
- Publication number
- JPH0412587Y2 JPH0412587Y2 JP8668587U JP8668587U JPH0412587Y2 JP H0412587 Y2 JPH0412587 Y2 JP H0412587Y2 JP 8668587 U JP8668587 U JP 8668587U JP 8668587 U JP8668587 U JP 8668587U JP H0412587 Y2 JPH0412587 Y2 JP H0412587Y2
- Authority
- JP
- Japan
- Prior art keywords
- end shield
- cathode
- thermionic
- thermionic emission
- metal coating
- 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
- 239000002184 metal Substances 0.000 claims description 11
- 229910052751 metal Inorganic materials 0.000 claims description 11
- 239000010953 base metal Substances 0.000 claims description 10
- 239000011248 coating agent Substances 0.000 claims description 10
- 238000000576 coating method Methods 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 9
- 239000000919 ceramic Substances 0.000 claims description 7
- 230000000694 effects Effects 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
Description
【考案の詳細な説明】
〔産業上の利用分野〕
この考案は、マグネトロン用カソードのエンド
シールドの構造に関するものである。[Detailed Description of the Invention] [Industrial Application Field] This invention relates to the structure of an end shield of a magnetron cathode.
第２図は従来のマグネトロン用カソードの一例
の構造を示す。図において１はカソードスリー
ブ、１１はベースメタル、１２はエンドシール
ド、２はバリウム、ストロンチウム、カルシウム
などの酸化物からなる熱電子放射物質である。
FIG. 2 shows the structure of an example of a conventional cathode for a magnetron. In the figure, 1 is a cathode sleeve, 11 is a base metal, 12 is an end shield, and 2 is a thermionic emitting material made of an oxide such as barium, strontium, or calcium.
図に示すように、従来マグネトロン用カソード
は、カソードスリーブ１にベースメタル１１を溶
接し、このベースメタル１１表面に熱電子放射物
質２を塗布し、この熱電子放出部の両端部にそれ
ぞれ該カソードの放出熱電子がアノード方向以外
へ放出することを防ぐためにエンドシールド１２
を設けた構造のカソードが使用されている。従来
のこの種のカソードは、エンドシールド１２が、
カソードスリーブ１やベースメタル１１とともに
Niなどの金属で構成されていた。 As shown in the figure, in the conventional magnetron cathode, a base metal 11 is welded to a cathode sleeve 1, a thermionic emitting material 2 is applied to the surface of the base metal 11, and the cathode is attached to both ends of the thermionic emitting part. The end shield 12 is used to prevent emitted thermionic electrons from being emitted in directions other than the anode direction.
A cathode with a structure is used. In a conventional cathode of this type, the end shield 12 is
Together with cathode sleeve 1 and base metal 11
It was composed of metals such as Ni.
従来のこの種のカソードでは、上記のように構
成されていたので、エンドシールド１２も熱伝導
がよく、使用時には、温度がベースメタル１１と
同程度に上昇する。このために、熱電子放出物質
２の一部が蒸発しエンドシールド１２に熱電子放
射物質が付着し、エンドシールド１２からポール
ピース（図示していない）に向かつて電子が放出
され（エンドシールドエミツシヨンと呼んでい
る）、この電子による暗流によつて、出力が低下
するという問題があつた。
Since the conventional cathode of this type is configured as described above, the end shield 12 also has good thermal conductivity, and its temperature rises to the same extent as the base metal 11 during use. For this reason, a part of the thermionic emission material 2 evaporates, the thermionic emission material adheres to the end shield 12, and electrons are emitted from the end shield 12 toward the pole piece (not shown). There was a problem in that the output decreased due to the dark current caused by this electron.
また、エンドシールド１２は、高温になるため
に、変形が起り易いという問題があつた。 Further, the end shield 12 has a problem of being easily deformed due to the high temperature.
この考案は、上記の問題を解消するためになさ
れたもので、エンドシールドエミツシヨンが発生
しにくく、暗流によつて出力が低下することな
く、また、温度上昇によつて変形することのない
エンドシールドを供えたマグネトロン用カソード
を提供することを目的とする。 This idea was made to solve the above problems, and the end shield emission is less likely to occur, the output does not decrease due to dark current, and it does not deform due to temperature rise. The purpose of the present invention is to provide a magnetron cathode equipped with an end shield.
この考案に係るマグネトロン用カソードは、エ
ンドシールドの材質をセラミツクにして、該エン
ドシールドの表面の少なくとも熱電子放出部側の
面を金属被膜で被覆し、該金属被膜は熱電子放出
部のベースメタルに導通させることを特徴とす
る。
In the magnetron cathode according to this invention, the material of the end shield is ceramic, and at least the surface of the end shield on the side of the thermionic emission part is coated with a metal coating, and the metal coating is the base metal of the thermionic emission part. It is characterized by being electrically conductive.
第１図はこの考案の一実施例の構造を示す。図
において１、２、１１は第２図の同一符号が示す
ものと同一または相当するものを示す。３はセラ
ミツク板３１の表面の熱電子放出部側の面を金属
被膜で被膜し、この金属被膜を熱電子放出部のベ
ースメタル１１にカソードスリーブ１を介して導
通（３２はメタライズ層）したエンドシールドで
ある。
FIG. 1 shows the structure of one embodiment of this invention. In the figure, 1, 2, and 11 indicate the same or equivalent components as those indicated by the same reference numerals in FIG. 3 is an end in which the surface of the ceramic plate 31 facing the thermionic emission section is coated with a metal coating, and this metal coating is electrically connected to the base metal 11 of the thermionic emission section via the cathode sleeve 1 (32 is a metallized layer). It is a shield.
エンドシールド３は、熱伝導率の小さいセラミ
ツク板３１でできているために、使用時、温度が
あまり上昇せず、熱電子放射物質が付着しても、
エンドシールドエミツシヨンが発生しにくく、エ
ンドシールドエミツシヨンによる暗流によつて出
力が低下するということがなくなる。 Since the end shield 3 is made of a ceramic plate 31 with low thermal conductivity, the temperature does not rise much during use, and even if thermionic emitting material adheres to it,
End shield emission is less likely to occur, and there is no possibility that the output will decrease due to dark current caused by end shield emission.
また、カソード全体の熱容量が小さくなり、熱
電子放射物質２が一定温度まで上昇するのに要す
る時間が短縮される。 Furthermore, the heat capacity of the entire cathode is reduced, and the time required for the thermionic emitting material 2 to rise to a certain temperature is shortened.
また、エンドシールド３は、高温においても変
形しにくいセラミツク板３１でできているため、
温度上昇によつて変形するということがなくな
る。 In addition, since the end shield 3 is made of a ceramic plate 31 that does not easily deform even at high temperatures,
Deformation due to temperature rise is eliminated.
エンドシールド３は、表面を金属被膜で被覆し
て（図には表面の熱電子放出部側の面のみを金属
被膜で被覆した例を示す）、この金属被膜を熱電
子放出部のベースメタルと導通し、同電位になる
ようにしたので、熱電子放出部から放出した電子
がエンドシールド３に衝突することもなく、二次
電子発生を心配する必要もない。 The end shield 3 has a surface coated with a metal coating (the figure shows an example in which only the surface on the thermionic emission part side is coated with a metal coating), and this metal coating is used as the base metal of the thermionic emission part. Since they are electrically conductive and have the same potential, the electrons emitted from the thermionic emission section will not collide with the end shield 3, and there is no need to worry about secondary electron generation.
以上のように、この考案によれば、エンドシー
ルドエミツシヨンによる暗流によつて、出力が低
下することがなくなり、エンドシールドが温度上
昇によつて変形することもなくなり、かつ、熱電
子放射物質が一定温度まで上昇するのに要する時
間を短縮できるという効果がある。
As described above, according to this invention, the output will not decrease due to the dark current caused by the end shield emission, the end shield will not be deformed due to temperature rise, and thermionic radiation This has the effect of shortening the time required for the temperature to rise to a certain level.
第１図はこの考案の一実施例の構造を示す断面
図、第２図は従来のマグネトロン用カソードの一
例の構造を示す断面図である。
１……カソードスリーブ、１１……ベースメタ
ル、２……熱電子放出物質、１２，３……エンド
シールド、３１……セラミツク板、３２……金属
被膜。
なお図中同一符号は同一または相当するものを
示す。
FIG. 1 is a sectional view showing the structure of an embodiment of this invention, and FIG. 2 is a sectional view showing the structure of an example of a conventional magnetron cathode. DESCRIPTION OF SYMBOLS 1... Cathode sleeve, 11... Base metal, 2... Thermionic emission material, 12, 3... End shield, 31... Ceramic plate, 32... Metal coating. Note that the same reference numerals in the figures indicate the same or equivalent parts.
Claims (1)
ルド備えたマグネトロン用カソードにおいて、 上記エンドシールドの材質をセラミツクにし
て、該エンドシールドの表面の少なくとも熱電子
放出部側の面を金属被膜で被覆し、該金属被膜は
熱電子放出部のベースメタルに導通させる特徴と
するマグネトロン用カソード。[Claims for Utility Model Registration] In a magnetron cathode having end shields at both ends of the thermionic emission part of the cathode, the material of the end shield is ceramic, and at least the surface of the end shield on the thermionic emission part side is made of ceramic. A cathode for a magnetron, the surface of which is coated with a metal coating, and the metal coating is electrically connected to a base metal of a thermionic emission part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8668587U JPH0412587Y2 (en) | 1987-06-05 | 1987-06-05 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8668587U JPH0412587Y2 (en) | 1987-06-05 | 1987-06-05 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63196548U JPS63196548U (en) | 1988-12-19 |
| JPH0412587Y2 true JPH0412587Y2 (en) | 1992-03-26 |
Family
ID=30943220
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8668587U Expired JPH0412587Y2 (en) | 1987-06-05 | 1987-06-05 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0412587Y2 (en) |
-
1987
- 1987-06-05 JP JP8668587U patent/JPH0412587Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63196548U (en) | 1988-12-19 |
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