JPH04144024A - Cathode structure body for electron tube - Google Patents
Cathode structure body for electron tubeInfo
- Publication number
- JPH04144024A JPH04144024A JP2268972A JP26897290A JPH04144024A JP H04144024 A JPH04144024 A JP H04144024A JP 2268972 A JP2268972 A JP 2268972A JP 26897290 A JP26897290 A JP 26897290A JP H04144024 A JPH04144024 A JP H04144024A
- Authority
- JP
- Japan
- Prior art keywords
- heater
- cathode
- sleeve
- layer
- melting point
- 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.)
- Granted
Links
- 229910052751 metal Inorganic materials 0.000 claims abstract description 13
- 239000002184 metal Substances 0.000 claims abstract description 13
- 239000000843 powder Substances 0.000 claims abstract description 10
- 238000002844 melting Methods 0.000 claims abstract description 9
- 230000008018 melting Effects 0.000 claims abstract description 7
- 239000000203 mixture Substances 0.000 claims abstract description 5
- 239000000945 filler Substances 0.000 claims description 5
- 239000010409 thin film Substances 0.000 claims description 4
- 239000010410 layer Substances 0.000 abstract description 19
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 abstract description 12
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 abstract description 7
- 239000011247 coating layer Substances 0.000 abstract description 6
- 229910052697 platinum Inorganic materials 0.000 abstract description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052759 nickel Inorganic materials 0.000 abstract description 3
- 239000008188 pellet Substances 0.000 abstract description 3
- 229910052721 tungsten Inorganic materials 0.000 abstract description 2
- 239000010937 tungsten Substances 0.000 abstract description 2
- 239000000463 material Substances 0.000 abstract 3
- 238000009792 diffusion process Methods 0.000 abstract 1
- HHIQWSQEUZDONT-UHFFFAOYSA-N tungsten Chemical compound [W].[W].[W] HHIQWSQEUZDONT-UHFFFAOYSA-N 0.000 abstract 1
- 238000001816 cooling Methods 0.000 description 11
- 230000000694 effects Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 4
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 3
- 239000002245 particle Substances 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
Landscapes
- Solid Thermionic Cathode (AREA)
Abstract
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は電子管用陰極構体に関する。[Detailed description of the invention] [Industrial application field] The present invention relates to a cathode assembly for an electron tube.
最近製作される電子管用陰極構体は、電子管の高帯域化
に伴い陰極径が小型化されてきた。陰極径の小型化によ
り陰極を加熱するヒータも小型化され、ヒータからの熱
伝達率を向上させる為、ヒータを陰極とスリーブにアル
ミナ充填材により埋め込むポツテッドヒータ陰極が用い
られている。Recently manufactured cathode assemblies for electron tubes have been made smaller in cathode diameter as electron tubes have higher bandwidths. As the diameter of the cathode has become smaller, the heater that heats the cathode has also become smaller, and in order to improve the heat transfer rate from the heater, a potted heater cathode is used in which the heater is embedded in the cathode and sleeve with alumina filler.
以下、第２図を参照して説明する。This will be explained below with reference to FIG.
さらに、陰極径の小型化が進みヒータ１が小型化される
様になると、ヒータ１の表面積を確保する為、ヒータ１
の径を細くしてヒータ線材の長さを長くせざるを得なく
なる。しかし、ヒータ線材の細線化は、ヒータ１のスリ
ーブ２から露出した部分（以下ヒータ脚部と記す）８の
熱容量低下を誘発する。Furthermore, as the diameter of the cathode progresses and the heater 1 becomes smaller, in order to secure the surface area of the heater 1,
This forces the diameter of the heater wire to be made smaller and the length of the heater wire to be made longer. However, the thinning of the heater wire induces a decrease in the heat capacity of the portion 8 of the heater 1 exposed from the sleeve 2 (hereinafter referred to as the heater leg).
ヒータ脚部８の熱容量の低下は、ヒータ電源ＯＮ時のラ
ッシュ電流によりヒータ脚部８の高温化をひき起こし、
使用条件によっては、ヒータ線材の高温脆化温度を超え
ヒータ断線不具合が発生する。The decrease in heat capacity of the heater legs 8 causes the heater legs 8 to become hotter due to the rush current when the heater power is turned on.
Depending on the usage conditions, the high temperature embrittlement temperature of the heater wire may be exceeded, causing a heater disconnection problem.
ヒータ脚部８の熱容量を上げ、ヒータ断線不具合を防止
する為、ヒータ脚部８にタングステン線をコイル状に巻
いたクーリングコイル３をヒータ脚部８に装着した陰極
構体が多く用いられている。In order to increase the heat capacity of the heater leg 8 and prevent the heater from breaking, a cathode structure in which a cooling coil 3 made of a tungsten wire wound in a coil is attached to the heater leg 8 is often used.
この従来のクーリングコイル付陰極構体ては、クーリン
グコイル３は、ヒータ脚部８にかしめにより固定される
。しかし、かしめ工程は、ヒータ脚部８に歪みを加える
ものであり、歪みによるヒータ線脆化、更には、ヒータ
断線を誘発するという問題点があった。In this conventional cathode structure with a cooling coil, the cooling coil 3 is fixed to the heater leg 8 by caulking. However, the caulking process applies strain to the heater leg portion 8, and there is a problem in that the strain causes the heater wire to become brittle, and furthermore, the heater may break.
又、クーリングコイル３は、ヒータ脚部８に密着してい
るのが理想であるか、ヒータ脚部８に挿入する為のはめ
合いしるが必要であり、又、ヒータ脚部８にクーリング
コイル３を挿入する工程の作業性を考慮すれば、クーリ
ングコイル３の密着性はある程度犠牲にせざるを得なく
なり、クーリングコイル３装着の効果を減少させてしま
うという問題点かあった。In addition, it is ideal that the cooling coil 3 is in close contact with the heater leg 8, or it is necessary to fit the cooling coil 3 in order to insert it into the heater leg 8. Considering the workability of the process of inserting the cooling coil 3, the adhesion of the cooling coil 3 has to be sacrificed to some extent, which leads to a problem in that the effect of mounting the cooling coil 3 is reduced.
本発明の目的は、ヒータの脆化による断線がなくヒータ
脚部のクーリング効果の高い電子管用陰極構体を提供す
ることにある。An object of the present invention is to provide a cathode assembly for an electron tube that does not cause disconnection due to heater embrittlement and has a high cooling effect on the heater legs.
本発明は、電子を放出する陰極と、ら線状のコイル部と
垂直に伸びたヒータ脚部からなる前記陰極を加熱するヒ
ータと、前記陰極を保持し前記ヒータの外周を覆うスリ
ーブと、前記ヒータと前記スリーブの間を充填する充填
材とを有する電子管用陰極構体において、前記ヒータの
前記充填材から露出している部分が金属薄膜層で被覆さ
れ、さらに、該金属薄膜層の外周が高融点金属粉末と該
高融点金属よりも融点が低い金属粉末の混合物による焼
結体層により被覆されている。The present invention provides a cathode that emits electrons, a heater that heats the cathode and includes heater legs that extend perpendicularly to a spiral coil portion, a sleeve that holds the cathode and covers the outer circumference of the heater, and a sleeve that holds the cathode and covers the outer periphery of the heater. In a cathode assembly for an electron tube having a filler filling between a heater and the sleeve, a portion of the heater exposed from the filler is covered with a metal thin film layer, and further, the outer periphery of the metal thin film layer is high. It is covered with a sintered body layer made of a mixture of a melting point metal powder and a metal powder whose melting point is lower than the high melting point metal.
次に、本発明の実施例について図面を参照して説明する
。Next, embodiments of the present invention will be described with reference to the drawings.
第１図は本発明の一実施例の電子管用陰極構体の断面図
である。FIG. 1 is a sectional view of a cathode assembly for an electron tube according to an embodiment of the present invention.
第１図に示すように、カソードベレット４は、スリーブ
２とろう付される。スリーブ２の内側には、ヒータ１が
アルミナ粉末焼結体５により埋め込まれている６ヒータ
１のスリーブ２より露出しなヒータ脚部８には、厚さ５
μｍの白金被覆層６がめつき法により形成される。１ら
に、白金被覆層６の外周には、平均粒径１０μｍの９５
％タングステン５％ニッケル粉末混合体からなる焼結体
層７が形成されている。焼結体層７は、１２００°Ｃの
水素雰囲気中で焼結されている。焼結体層７の平均厚さ
は５０μｍである。As shown in FIG. 1, the cathode pellet 4 is brazed to the sleeve 2. Inside the sleeve 2, the heater 1 is embedded with an alumina powder sintered body 5.The heater leg part 8 of the heater 1, which is not exposed from the sleeve 2, has a thickness of 5.
A platinum coating layer 6 having a thickness of μm is formed by a plating method. 1. On the outer periphery of the platinum coating layer 6, 95 particles having an average particle size of 10 μm are coated.
A sintered body layer 7 consisting of a powder mixture of 5% tungsten and 5% nickel is formed. The sintered body layer 7 is sintered in a hydrogen atmosphere at 1200°C. The average thickness of the sintered body layer 7 is 50 μm.
尚、白金被覆層６は、焼結体層７中に含まれるニッケル
成分がヒータ脚部８の中に熱拡散し、脆化をひきおこす
ことを防止している。The platinum coating layer 6 prevents the nickel component contained in the sintered body layer 7 from thermally diffusing into the heater leg 8 and causing embrittlement.
この白金被覆層６と焼結体層７の装着により、ヒータ電
力印加時にヒータ脚部８の温度が１６００℃まで上昇し
ていた電子管用陰極構体を１２００℃まで下げる効果を
発揮する。By attaching the platinum coating layer 6 and the sintered body layer 7, the temperature of the heater leg 8 of the electron tube cathode structure, which had risen to 1600°C when heater power was applied, is reduced to 1200°C.
以上説明したように本発明は、ヒータ脚部に、金属粉末
焼結体層を装着することにより、ヒータ電力印加時のヒ
ータ脚部の温度上昇を抑える効果を有する。As described above, the present invention has the effect of suppressing the rise in temperature of the heater leg when heater power is applied by attaching the metal powder sintered body layer to the heater leg.
例えば、ヒータ電力印加時ヒータ脚部が１６００°Ｃま
で上昇するヒータにおいて、ヒータ脚部に５０μｍの厚
さのタングステン粉末焼結層を装着することにより、ヒ
ータ脚部の温度は１２００℃まで低減することができ、
ヒータ脚部の高温による金！！脆化を防ぐ効果がある。For example, in a heater where the heater leg rises to 1600°C when heater power is applied, the temperature of the heater leg can be reduced to 1200°C by attaching a 50 μm thick tungsten powder sintered layer to the heater leg. It is possible,
Gold due to high temperature of heater legs! ! It has the effect of preventing embrittlement.
これは、ヒータ脚部周りの熱容量が増加するとともに、
焼結体層表面の凹凸によりヒータ脚部単体に比べ表面積
が増加し、輻射熱量が増加する為である。This increases the heat capacity around the heater legs and
This is because the unevenness of the surface of the sintered body layer increases the surface area compared to the heater leg alone, and the amount of radiant heat increases.
又、従来のクーリングコイルを装着する技術に比べ、本
発明はかしめ工程がない為、ヒータ脚部に歪を加えるこ
とがない。故に、ヒータ線材の歪によるヒータ線材脆化
及びヒータ断線を防ぐ効果がある。Furthermore, compared to conventional techniques for mounting cooling coils, the present invention does not require a caulking process, so no distortion is applied to the heater legs. Therefore, there is an effect of preventing heater wire embrittlement and heater breakage due to distortion of the heater wire.
更に、焼結層はヒータ脚部全面に接着している為、機械
的強度が均一で安定した品質を得るという効果がある。Furthermore, since the sintered layer is adhered to the entire surface of the heater leg, it has the effect of providing uniform mechanical strength and stable quality.
第１図は本発明の一実施例の電子管用陰極構体の断面図
、第２図は従来の電子管用陰極構体の一例の断面図であ
る。
１・・・ヒータ、２・・・スリーブ、３・・・クーリン
グコイル、４・・・カソードベレット、５・・アルミナ
充填材、６・・白金層被覆層、７・・・焼結体層、８
・ヒータ脚部。FIG. 1 is a sectional view of a cathode assembly for an electron tube according to an embodiment of the present invention, and FIG. 2 is a sectional view of an example of a conventional cathode assembly for an electron tube. DESCRIPTION OF SYMBOLS 1... Heater, 2... Sleeve, 3... Cooling coil, 4... Cathode pellet, 5... Alumina filler, 6... Platinum layer coating layer, 7... Sintered compact layer, 8
・Heater leg.
Claims (1)
たヒータ脚部からなる前記陰極を加熱するヒータと、前
記陰極を保持し前記ヒータの外周を覆うスリーブと、前
記ヒータと前記スリーブの間を充填する充填材とを有す
る電子管用陰極構体において、前記ヒータの前記充填材
から露出している部分が金属薄膜層で被覆され、さらに
、該金属薄膜層の外周が高融点金属粉末と該高融点金属
よりも融点が低い金属粉末の混合物による焼結体層によ
り被覆されていることを特徴とする電子管用陰極構体。A cathode that emits electrons; a heater that heats the cathode and includes a spiral coil portion and heater legs extending perpendicularly; a sleeve that holds the cathode and covers the outer periphery of the heater; and the heater and the sleeve. In the cathode assembly for an electron tube, the part of the heater exposed from the filler is covered with a metal thin film layer, and further, the outer periphery of the metal thin film layer is coated with high melting point metal powder. 1. A cathode structure for an electron tube, characterized in that the cathode structure for an electron tube is covered with a sintered body layer made of a mixture of metal powder having a melting point lower than that of the high melting point metal.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26897290A JP3127461B2 (en) | 1990-10-05 | 1990-10-05 | Cathode structure for electron tube |
| MX9101441A MX9101441A (en) | 1990-10-05 | 1991-10-04 | POLYACETAL RESIN COMPOSITION |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26897290A JP3127461B2 (en) | 1990-10-05 | 1990-10-05 | Cathode structure for electron tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04144024A true JPH04144024A (en) | 1992-05-18 |
| JP3127461B2 JP3127461B2 (en) | 2001-01-22 |
Family
ID=17465865
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26897290A Expired - Fee Related JP3127461B2 (en) | 1990-10-05 | 1990-10-05 | Cathode structure for electron tube |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP3127461B2 (en) |
| MX (1) | MX9101441A (en) |
-
1990
- 1990-10-05 JP JP26897290A patent/JP3127461B2/en not_active Expired - Fee Related
-
1991
- 1991-10-04 MX MX9101441A patent/MX9101441A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| MX9101441A (en) | 1992-06-05 |
| JP3127461B2 (en) | 2001-01-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |