JPH05114352A - Impregnated type cathode body structure and its manufacture - Google Patents

Impregnated type cathode body structure and its manufacture

Info

Publication number
JPH05114352A
JPH05114352A JP27750591A JP27750591A JPH05114352A JP H05114352 A JPH05114352 A JP H05114352A JP 27750591 A JP27750591 A JP 27750591A JP 27750591 A JP27750591 A JP 27750591A JP H05114352 A JPH05114352 A JP H05114352A
Authority
JP
Japan
Prior art keywords
impregnated
cathode
thin plate
electron emitting
porous tungsten
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
Application number
JP27750591A
Other languages
Japanese (ja)
Inventor
Toru Yakabe
徹 矢壁
Akito Hara
昭人 原
Eiji Yamamoto
栄治 山本
Noboru Kitamori
昇 北森
Shigetaka Kajima
繁貴 梶間
Junji Hatakeyama
淳二 畠山
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Toshiba Development and Engineering Corp
Original Assignee
Toshiba Corp
Toshiba Electronic Engineering Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toshiba Corp, Toshiba Electronic Engineering Co Ltd filed Critical Toshiba Corp
Priority to JP27750591A priority Critical patent/JPH05114352A/en
Publication of JPH05114352A publication Critical patent/JPH05114352A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To reduce the quantity of excess adhesion after electron emitting material has been impregnated as well as to stabilize quality by lapping the surface of a body substrate made of a porous tungsten sheet, and thereby finishing the surface within a specified range in roughness. CONSTITUTION:An impregnated type cathode is furnished with a cathode base substrate 1 composed of a porous tungsten sheet the hole sections of which are impregnated with electron emitting material, and with a cathode sleeve 4 to one end opening section of which the base substrate is joined. Finishing the surface of the base substrate 1 within a range of Rmax. 0.5 to 3.2mum lowers the quantity of adhesion of excess electron emitting material so as to facilitate the cleaning of the surface with adhesion removed. The base substrate 1 is formed as follows, tungsten powder is molded by press, it is sintered thereafter so as to be turned out to be a porous membrane, and the surface of it is then lapped, so that it is finished within a range of roughness as mentioned above. Following which, the hole sections are impregnated with electron emitting material, and after excess emitting material on the surface has been removed, it is formed and inserted into the sleeve 4 so as to be joined.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】この発明は、含浸型陰極構体及び
その製造方法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impregnated cathode assembly and a method for manufacturing the same.

【0002】[0002]

【従来の技術】一般に、陰極線管等の電子管用陰極とし
て、従来より多孔質タングステン薄板の空孔部に電子放
射性物質を含浸させ、且つこの多孔質タングステン薄板
の一方の面(背面)にルテニウム・モリブデン溶融層を
形成して、電子放射性物質の蒸発を防ぐようにした含浸
型陰極基体がある。
2. Description of the Related Art Generally, as a cathode for an electron tube such as a cathode ray tube, a porous tungsten thin plate is conventionally impregnated with an electron emissive substance, and one surface (back surface) of this porous tungsten thin plate is ruthenium-coated. There is an impregnated type cathode substrate in which a molybdenum molten layer is formed to prevent evaporation of an electron emissive material.

【0003】この種の含浸型陰極基体の製造方法として
は、既に各種の方法が知られているが、その一方法とし
て特開昭58−44643号公報には、次の方法が示さ
れている。
Various methods have been already known as a method of manufacturing this type of impregnated cathode substrate, and the following method is disclosed in Japanese Patent Application Laid-Open No. 58-44643 as one method. ..

【0004】先ず、タングステン粉末を圧縮成形した
後、還元性雰囲気中で焼結して径大長大な多孔質タング
ステンロッドを形成する。次に、この多孔質タングステ
ンロッドの空孔部に銅を含浸する。そして、この銅含浸
多孔質タングステンロッドを、旋盤加工あるいはワイヤ
放電加工などにより、厚さ0.5mm、直径30mm程
度の薄板にスライスする。次に、硝酸によりこの薄板中
の銅を溶解、あるいは還元性雰囲気中で加熱処理して、
薄板から銅を除去する。
First, a tungsten powder is compression-molded and then sintered in a reducing atmosphere to form a large-diameter and long-sized porous tungsten rod. Next, copper is impregnated into the pores of this porous tungsten rod. Then, the copper-impregnated porous tungsten rod is sliced into a thin plate having a thickness of 0.5 mm and a diameter of about 30 mm by lathe machining or wire electric discharge machining. Next, dissolve the copper in this thin plate with nitric acid, or heat-treat in a reducing atmosphere,
Remove copper from sheet.

【0005】その後、この多孔質タングステン薄板の一
方の面に、ルテニウムとモリブデンの混合粉末と有機バ
イダ−からなる懸濁液を滴下して乾燥する。更に還元性
雰囲気中で約2000℃に加熱し、ルテニウムとモリブ
デンを溶融させて、電子放射性物質の蒸発を防止するた
めのルテニウム・モリブデン溶融層を形成する。
Then, a suspension composed of a mixed powder of ruthenium and molybdenum and an organic binder is dropped on one surface of the porous tungsten thin plate and dried. Further, it is heated to about 2000 ° C. in a reducing atmosphere to melt ruthenium and molybdenum to form a ruthenium-molybdenum molten layer for preventing evaporation of electron emissive material.

【0006】次に、還元性雰囲気中で、この多孔質タン
グステン薄板の空孔部に、BaO、CaO、Al2 3
からなる電子放射性物質を含浸させる。そして、この電
子放射性物質が含浸された多孔質タングステン薄板を、
放電加工あるいはレ−ザ加工などにより、所定形状に切
り抜いて陰極基体とする。
Next, in a reducing atmosphere, the pores of this porous tungsten thin plate are filled with BaO, CaO, Al 2 O 3
Is impregnated with an electron emissive material. And, a porous tungsten thin plate impregnated with this electron emitting substance,
The cathode substrate is cut out into a predetermined shape by electric discharge machining or laser machining.

【0007】[0007]

【発明が解決しようとする課題】ところが、上記のよう
な従来の製造方法により得られた含浸型陰極基体は、そ
の表面粗さが10μm前後と粗く、陰極基体の製造工程
において、次のような問題が生じた。
However, the surface roughness of the impregnated type cathode substrate obtained by the above-described conventional manufacturing method is as rough as about 10 μm, and the following steps are taken in the manufacturing process of the cathode substrate. There was a problem.

【0008】即ち、多孔質タングステン薄板に電子放射
性物質を含浸させる工程において、不活性雰囲気中で溶
融含浸させた後、余剰の電子放射性物質を除去する際、
多孔質タングステン薄板の表面粗度が粗いため、溝部に
余剰の電子放射性物質が残り易く、大気中の水分あるい
は炭酸ガスと反応して不活性なBa(OH)2 あるいは
BaCO3 に変質し、電子放射に有害な部分が生ずると
いう問題があった。このように従来の製造方法による
と、大量生産において安定な品質の含浸型陰極構体を得
ることが容易ではない。
That is, in the step of impregnating a porous tungsten thin plate with an electron emissive substance, when the surplus electron emissive substance is removed after melt impregnation in an inert atmosphere,
Since the surface roughness of the porous tungsten thin plate is rough, excess electron emissive material is likely to remain in the groove, and it reacts with moisture or carbon dioxide in the atmosphere to be transformed into inactive Ba (OH) 2 or BaCO 3 to generate electrons. There was a problem that harmful parts were generated in the radiation. As described above, according to the conventional manufacturing method, it is not easy to obtain an impregnated-type cathode assembly having stable quality in mass production.

【0009】この発明は、以上のような問題点を解決し
て、大量生産において安定した品質の含浸型陰極構体が
得られる含浸型陰極構体及びその製造方法を提供するこ
とを目的とする。
An object of the present invention is to provide an impregnated-type cathode assembly and a method for producing the same, which solves the above-mentioned problems and can obtain an impregnated-type cathode assembly of stable quality in mass production.

【0010】[0010]

【課題を解決するための手段】この発明は、空孔部に電
子放射性物質が含浸された多孔質タングステン薄板から
なる陰極基体と、この陰極基体が一端開口部に直接又は
間接的に接合された陰極スリ−ブと、を具備する含浸型
陰極構体において、上記陰極基体の表面粗さが、Rma
x0.5乃至3.2μmの範囲内にある含浸型陰極構体
である。
According to the present invention, a cathode substrate made of a porous tungsten thin plate in which holes are impregnated with an electron emitting substance, and the cathode substrate is directly or indirectly bonded to an opening at one end. In the impregnated-type cathode assembly including a cathode sleeve, the surface roughness of the cathode substrate is Rma.
It is an impregnated-type cathode assembly in the range of x0.5 to 3.2 μm.

【0011】又、この発明は、タングステン粉末をプレ
ス成型した後、焼結して多孔質タングステン薄板を形成
する工程と、上記多孔質タングステン薄板を研磨により
Rmax0.5乃至3.2μmの範囲内で表面仕上げを
行ない陰極基体を得る工程と、上記陰極基体を陰極スリ
−ブに挿入し、直接又は間接的に接合する工程と、を具
備する含浸型陰極構体の製造方法である。
Further, according to the present invention, a step of forming a porous tungsten thin plate by press-molding tungsten powder and then sintering it, and polishing the porous tungsten thin plate within a range of Rmax 0.5 to 3.2 μm. It is a method for producing an impregnated-type cathode assembly, comprising a step of performing a surface finish to obtain a cathode substrate, and a step of inserting the cathode substrate into a cathode sleeve and directly or indirectly joining the cathode substrate.

【0012】[0012]

【作用】この発明によれば、多孔質タングステン薄板の
表面をバフ研磨により平坦にすることにより、電子放射
性物質を含浸させた後に、表面に残る余剰電子放射性物
質を減少させることが出来る。その結果、安定した品質
の含浸型陰極構体を容易に製造することが出来る。
According to the present invention, the surface of the porous tungsten thin plate is flattened by buffing, so that the surplus electron emitting substance remaining on the surface after impregnating the electron emitting substance can be reduced. As a result, it is possible to easily manufacture an impregnated-type cathode assembly with stable quality.

【0013】[0013]

【実施例】以下、図面を参照して、この発明の一実施例
を詳細に説明する。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

【0014】この発明による含浸型陰極構体は図1に示
すように構成され、図中の符号1は円板状の陰極基体で
ある。この陰極基体1は空孔部に電子放射性物質が含浸
された多孔質タングステン薄板からなり、その表面粗さ
が、Rmax0.5乃至3.2μmの範囲内に設定され
ている。そして、この陰極基体1の一面(背面)には、
電子放射性物質の蒸発を防止するためのルテニウム・モ
リブデン溶融層2が形成され、このルテニウム・モリブ
デン溶融層2が底部に位置するように、陰極基体1が有
底短円筒状のカップ3内に収納され固着されている。
The impregnated-type cathode assembly according to the present invention is constructed as shown in FIG. 1. Reference numeral 1 in the figure is a disk-shaped cathode substrate. The cathode substrate 1 is made of a porous tungsten thin plate having pores impregnated with an electron emitting substance, and its surface roughness is set within a range of Rmax 0.5 to 3.2 μm. Then, on one surface (back surface) of the cathode substrate 1,
A ruthenium / molybdenum molten layer 2 for preventing evaporation of an electron emissive substance is formed, and the cathode substrate 1 is housed in a cup 3 having a short cylindrical shape with a bottom so that the ruthenium / molybdenum molten layer 2 is located at the bottom. And is stuck.

【0015】このカップ3は、その底部側から円筒状の
陰極スリ−ブ4の一端開口部に挿入され、この一端開口
部に陰極基体1を露出させた状態で、カップ3が陰極ス
リ−ブ4に固着されている。尚、陰極スリ−ブ4内には
ヒ−タ5が配置されている。更に、陰極スリ−ブ4の他
端外周に、複数例えば3本のストラップ6の一端部が固
着され、各ストラップ6の他端部は、陰極スリ−ブ4の
外側に所定間隔で同軸的に配設された筒状ホルダ7の張
り出し部7aに懸垂固着されている。次に、上記のよう
な含浸型陰極構体の製造方法について説明するが、最初
に陰極基体1の製造方法について述べることにする。
The cup 3 is inserted into the one end opening of a cylindrical cathode sleeve 4 from the bottom side thereof, and the cup 3 is covered by the cathode sleeve 1 with the cathode base 1 exposed. It is fixed to 4. A heater 5 is arranged in the cathode sleeve 4. Further, one end of a plurality of, for example, three straps 6 is fixed to the outer periphery of the other end of the cathode sleeve 4, and the other end of each strap 6 is coaxial with the outside of the cathode sleeve 4 at a predetermined interval. It is suspended and fixed to the projecting portion 7a of the cylindrical holder 7 provided. Next, a method for manufacturing the above-mentioned impregnated cathode structure will be described. First, a method for manufacturing the cathode substrate 1 will be described.

【0016】先ず、平均粒径3〜5μmのタングステン
粉末と少量のパラフィンを混合し、一定量のプレス機の
ダイに供給後、〜5Kg/cm2 程度で加圧し直径35
mm,厚さ1.2mmに成型する。次に、水素炉中で1
800℃,数時間〜十数時間焼結を行ない、直径約30
mm,厚さ約1mm,空孔率約20%の多孔質タングス
テン薄板を製作する。
First, a tungsten powder having an average particle size of 3 to 5 μm and a small amount of paraffin are mixed and fed to a die of a press machine at a fixed amount, then to 5 Kg / cm 2 Pressing with a degree of 35
mm and thickness 1.2 mm. Next, 1 in a hydrogen furnace
Sintered at 800 ℃ for several hours to more than 10 hours, diameter about 30
mm, thickness about 1 mm, porosity about 20% to produce a porous tungsten thin plate.

【0017】その後、平面研削を行なった後、#150
0〜#3000程度のGCによるバフ研磨、又はGC#
380による粗いバフ研磨を行なった後、#1500〜
#3000程度の仕上げバフ研磨を行なうことにより、
厚さ0.4mmで表面粗度3.2μm以下、望ましくは
1.6μm以下の平坦な面を持つ多孔質タングステン薄
板を得る。
Then, after performing surface grinding, # 150
Buffing by GC of 0 to # 3000 or GC #
After rough buffing with 380, # 1500-
By performing the finish buffing of about # 3000,
A porous tungsten thin plate having a flat surface with a thickness of 0.4 mm and a surface roughness of 3.2 μm or less, preferably 1.6 μm or less is obtained.

【0018】次に、この多孔質タングステン薄板の一面
にルテニウム・モリブデンのろう材を塗布し、還元性雰
囲気で溶融させルテニウム・モリブデン溶融層を形成す
る。次に、ルテニウム・モリブデン溶融層の形成された
反対の面からBaO,CaO,Al2 3 からなる電子
放射物質を還元性雰囲気で溶融させ、多孔質タングステ
ン薄板の空孔部に含浸する。その後、アルコ−ル洗浄な
どにより、残存する余剰の電子放射物質を除去する。
Next, a brazing material of ruthenium / molybdenum is applied to one surface of the porous tungsten thin plate and melted in a reducing atmosphere to form a ruthenium / molybdenum molten layer. Next, an electron emitting material composed of BaO, CaO, and Al 2 O 3 is melted in a reducing atmosphere from the opposite surface on which the ruthenium-molybdenum molten layer is formed, and impregnates the pores of the porous tungsten thin plate. Then, the remaining excess electron emitting substance is removed by alcohol cleaning or the like.

【0019】表面粗度については、以下の検証実験によ
り決定した。即ち、表面粗度0.8乃至1.2μm,表
面粗度2.3乃至2.8μm,表面粗度6μmの多孔質
タングステン薄板に、電子放射物質を含浸させた後の表
面SEM写真によると、余剰の電子放射物質は表面粗度
の小さいもの程、少なく良好であることが判る。又、表
面粗度3.2μm以下なら、余剰の電子放射物質は後の
工程で簡単に除去することが出来る。次に表面粗度Rm
ax0.5以下が悪い理由について、説明する。
The surface roughness was determined by the following verification experiment. That is, according to a surface SEM photograph after impregnating a porous tungsten thin plate having a surface roughness of 0.8 to 1.2 μm, a surface roughness of 2.3 to 2.8 μm, and a surface roughness of 6 μm with an electron emitting substance, It can be seen that the surplus electron-emitting material has a smaller surface roughness and is better. Further, if the surface roughness is 3.2 μm or less, the surplus electron emitting substance can be easily removed in the subsequent process. Next, the surface roughness Rm
The reason why ax of 0.5 or less is bad will be described.

【0020】Rmax0.5より小さく仕上げると、多
孔質タングステン薄板の表面は殆ど鏡面になる。これを
SEM写真で観察すると、タングステン粒の粒界が認め
られ、細孔(pore)もはっきり開孔している。この
状態で不活性雰囲気で電子放射物質を含浸した後、大気
中に取出すと、余剰の電子放射物質の残量は極く少な
く、非常に綺麗である。又、後工程の洗浄等により、余
剰の電子放射物質の除去は簡単に出来る。
When finished smaller than Rmax 0.5, the surface of the porous tungsten thin plate becomes almost a mirror surface. When this is observed by an SEM photograph, the grain boundaries of the tungsten grains are recognized, and the pores are clearly opened. When the electron emitting substance is impregnated in this state in an inert atmosphere and then taken out into the atmosphere, the residual amount of the surplus electron emitting substance is extremely small and it is very beautiful. Further, the excess electron emitting material can be easily removed by washing in the subsequent process.

【0021】しかし、この電子放射物質を含浸した多孔
質タングステン薄板は、陰極構体の組み立て等の大気中
での滞留において、表面近傍の空孔中の電子放射物質が
空気中のH2 OあるいはCO2 ガスを吸着し反応するこ
とにより、電子放射物質がBa(OH)2 あるいはBa
CO3 に変質して膨潤し、表面近傍の細孔(pore)
から電子放射物質が表面に吹き出してくる。このタング
ステン粒1個1個の粒界がはっきり識別出来る程の仕上
げ面を持つ多孔質タングステン薄板は、この内部応力に
耐えられず、吹き出した細孔(pore)を中心にクラ
ックが生じて膨れ上がり、ひどい時にはバラバラに割れ
てしまう。
However, in the porous tungsten thin plate impregnated with the electron emitting substance, the electron emitting substance in the pores near the surface of the porous tungsten thin plate impregnated in the atmosphere during assembly of the cathode assembly or the like is H 2 O or CO in the air. By adsorbing two gases and reacting with each other, the electron-emitting substance becomes Ba (OH) 2 or Ba.
It transforms into CO 3 and swells, and pores near the surface
Electron emitting material is blown from the surface. This porous tungsten thin plate having a finished surface that allows the grain boundaries of each tungsten grain to be clearly identified cannot withstand this internal stress, and cracks center around the blown pores and swell. , When it is terrible, it will break apart.

【0022】逆に、表面粗度Rmax0.5以上の場合
には、タングステン粒がある程度延びてタングステンの
粒子間がブリッジ状に連なっており、この内部応力に耐
えられるので、クラックが生じることはない。
On the other hand, when the surface roughness Rmax is 0.5 or more, the tungsten grains extend to some extent and the tungsten grains are connected in a bridge shape, and the internal stress can withstand, so that no crack occurs. ..

【0023】尚、平面研削及びバフ研磨工程において、
多孔質タングステン薄板の目潰れ防止及び加工性向上の
ために、予め空孔部に銅あるいはプラスチックを含浸さ
せておき、バフ研磨後、還元性雰囲気中で加熱、除去し
多孔質タングステン薄板としても良い。
In the surface grinding and buffing process,
In order to prevent crushing of the porous tungsten thin plate and improve workability, the pores may be impregnated with copper or plastic in advance, buffed, and then heated and removed in a reducing atmosphere to form a porous tungsten thin plate. ..

【0024】次に、多孔質タングステン薄板の一面にル
テニウム・モリブデン粉末を適当な有機バインダ−と共
に溶媒に混合したろう材を塗布した後、還元性雰囲気で
加熱し、ルテニウム・モリブデンの溶融層を形成する。
Next, a brazing filler metal prepared by mixing ruthenium molybdenum powder with a suitable organic binder in a solvent is applied to one surface of the porous tungsten thin plate, and then heated in a reducing atmosphere to form a molten layer of ruthenium molybdenum. To do.

【0025】次に、多孔質タングステンの空孔部に電子
放射物質を含浸し、表面の余剰エミッタ−を除去した
後、放電加工あるいはレ−ザ加工により例えば直径1.
45mmの円板に切り抜くことにより、表面を電子放射
面とし、その反対面にルテニウム・モリブデン溶融層を
持つ含浸型陰極基体が得られる。以上述べたように、こ
の発明の製造方法では、量産性に優れ安定した品質の含
浸型陰極基体が得られる。さて次に、この発明の含浸型
陰極基体を使用した陰極構体の組み立て法について、説
明する。
Next, the hole portion of the porous tungsten is impregnated with an electron emitting substance to remove the surplus emitter on the surface, and then, for example, by electrical discharge machining or laser machining, for example, a diameter of 1.
By cutting into a disc of 45 mm, an impregnated cathode substrate having a ruthenium-molybdenum molten layer on the surface opposite to the electron emission surface can be obtained. As described above, according to the manufacturing method of the present invention, an impregnated-type cathode substrate having excellent mass productivity and stable quality can be obtained. Now, a method of assembling a cathode assembly using the impregnated cathode substrate of the present invention will be described.

【0026】即ち、図1に示すように、上記方法により
製造された含浸型陰極基体1の均一なルテニウム・モリ
ブデン溶融層2が内側になるように、タンタルからなる
カップ3の内側に挿入し、抵抗溶接又はレ−ザ溶接によ
り、その陰極基体1をカップ3の底部に接合する。次
に、この陰極基体1が接合されたカップ3をタンタルか
らなる陰極スリ−ブ4の一端開口部に嵌め合わせ、その
側面を溶接により接合する。
That is, as shown in FIG. 1, the impregnated cathode substrate 1 manufactured by the above method is inserted inside the cup 3 made of tantalum so that the uniform ruthenium-molybdenum molten layer 2 is inside. The cathode substrate 1 is joined to the bottom of the cup 3 by resistance welding or laser welding. Next, the cup 3 to which the cathode substrate 1 is joined is fitted into one end opening of the cathode sleeve 4 made of tantalum, and the side surfaces thereof are joined by welding.

【0027】更に、この陰極スリ−ブ4の他端部側面に
3個のタンタルからなるストラップ6の一端を溶接によ
り接合し、これらストラップ6の他端をFe−Ni−C
o合金からなる陰極ホルダ7の一端部内側に張り出した
張り出し部7aに溶接接合する。次いで、陰極スリ−ブ
4内にヒ−タ5を配置することにより、所要の含浸型陰
極構体が完成する。
Further, one end of a strap 6 made of three tantalums is joined to the side surface of the other end of the cathode sleeve 4 by welding, and the other ends of these straps 6 are made of Fe-Ni-C.
The cathode holder 7 made of o alloy is welded to the protruding portion 7a protruding to the inside of one end. Next, the heater 5 is placed in the cathode sleeve 4 to complete the required impregnated cathode structure.

【0028】[0028]

【発明の効果】この発明によれば、多孔質タングステン
薄板からなる陰極基体の表面をラップ研磨し、表面粗度
をRmax0.5乃至3.2μmの範囲内に仕上げてい
るので、電子放射物質を含浸させた後の余剰電子放射物
質の付着量を低減させることが出来、且つ後の洗浄工程
で簡単に除去することが出来る。
According to the present invention, since the surface of the cathode substrate made of a porous tungsten thin plate is lap-polished and the surface roughness is finished within the range of Rmax 0.5 to 3.2 μm, the electron-emitting substance is eliminated. It is possible to reduce the adhered amount of the surplus electron emitting material after the impregnation, and it is possible to easily remove it in the subsequent cleaning step.

【0029】この結果、大気中の水分や炭酸ガスによ
り、陰極基体の表面が変質することはない。従って、組
立て工程でも変質することは少なく、極めて安定した高
品位の含浸型陰極構体が得られる。
As a result, the surface of the cathode substrate will not be altered by atmospheric moisture or carbon dioxide. Therefore, the quality of the impregnated cathode structure is not deteriorated even during the assembling process, and an extremely stable high-quality impregnated cathode structure can be obtained.

【図面の簡単な説明】[Brief description of drawings]

【図1】この発明の一実施例に係る含浸型陰極構体を一
部切り欠いて示す斜視図。
FIG. 1 is a perspective view showing an impregnated-type cathode assembly according to an embodiment of the present invention with a part cut away.

【符号の説明】[Explanation of symbols]

1…陰極基体、2…ルテニウム・モリブデン溶融層、3
…カップ、4…陰極スリ−ブ、5…ヒ−タ、6…ストラ
ップ、7…筒状ホルダ。
1 ... Cathode substrate, 2 ... Ruthenium / molybdenum fused layer, 3
... Cup, 4 ... Cathode sleeve, 5 ... Heater, 6 ... Strap, 7 ... Cylindrical holder.

───────────────────────────────────────────────────── フロントページの続き (72)発明者 山本 栄治 神奈川県川崎市幸区堀川町72番地 株式会 社東芝堀川町工場内 (72)発明者 北森 昇 神奈川県横浜市磯子区新杉田町8番地 株 式会社東芝横浜事業所内 (72)発明者 梶間 繁貴 神奈川県横浜市磯子区新杉田町8番地 株 式会社東芝横浜事業所内 (72)発明者 畠山 淳二 神奈川県横浜市磯子区新杉田町8番地 株 式会社東芝横浜事業所内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Eiji Yamamoto Eiji Yamamoto 72 Horikawa-cho, Sachi-ku, Kawasaki-shi, Kanagawa Stock company Toshiba Horikawa-cho factory (72) Inventor Noboru Kitamori 8 Shinsugita-cho, Isogo-ku, Yokohama-shi, Kanagawa Ceremony Company Toshiba Yokohama Office (72) Inventor Shigeki Kajama 8 Shinsita-cho, Isogo-ku, Yokohama-shi Kanagawa Stock Company Inc. Toshiba Yokohama Office (72) Inventor Junji Hatakeyama 8 Shinsita-cho, Isogo-ku Yokohama-shi Kanagawa Stock Company Toshiba Yokohama Office

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 空孔部に電子放射性物質が含浸された多
孔質タングステン薄板からなる陰極基体と、この陰極基
体が一端開口部に直接又は間接的に接合された陰極スリ
−ブと、 を具備する含浸型陰極構体において、 上記陰極基体の表面粗さが、Rmax0.5乃至3.2
μmの範囲内にあることを特徴とする含浸型陰極構体。
1. A cathode substrate comprising a porous tungsten thin plate having pores impregnated with an electron emissive material, and a cathode sleeve in which the cathode substrate is directly or indirectly bonded to an opening at one end. In the impregnated-type cathode assembly, the surface roughness of the cathode substrate is Rmax 0.5 to 3.2.
An impregnated-type cathode assembly, which is in the range of μm.
【請求項2】 タングステン粉末をプレス成型した後、
焼結して多孔質タングステン薄板を形成する工程と、 上記多孔質タングステン薄板を研磨によりRmax0.
5乃至3.2μmの範囲内で表面仕上げを行ない陰極基
体を得る工程と、 上記陰極基体を陰極スリ−ブに挿入し、直接又は間接的
に接合する工程と、 を具備することを特徴とする含浸型陰極構体の製造方
法。
2. After press-molding tungsten powder,
Sintering to form a porous tungsten thin plate, and polishing the porous tungsten thin plate at Rmax 0.
The method comprises: a step of obtaining a cathode substrate by surface finishing within a range of 5 to 3.2 μm; and a step of inserting the cathode substrate into a cathode sleeve and directly or indirectly joining the cathode substrate. Method for manufacturing impregnated cathode assembly.
JP27750591A 1991-10-24 1991-10-24 Impregnated type cathode body structure and its manufacture Pending JPH05114352A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP27750591A JPH05114352A (en) 1991-10-24 1991-10-24 Impregnated type cathode body structure and its manufacture

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP27750591A JPH05114352A (en) 1991-10-24 1991-10-24 Impregnated type cathode body structure and its manufacture

Publications (1)

Publication Number Publication Date
JPH05114352A true JPH05114352A (en) 1993-05-07

Family

ID=17584531

Family Applications (1)

Application Number Title Priority Date Filing Date
JP27750591A Pending JPH05114352A (en) 1991-10-24 1991-10-24 Impregnated type cathode body structure and its manufacture

Country Status (1)

Country Link
JP (1) JPH05114352A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10286512A (en) * 1997-02-14 1998-10-27 Ngk Insulators Ltd Method for forming coat and coat-forming part
EP1063668A2 (en) * 1999-06-22 2000-12-27 Nec Corporation Cathode subassembly and color crt equipped therewith
EP1367620A1 (en) * 2002-05-31 2003-12-03 Thomson Licensing S.A. Cathode emissive body for an impregnated cathode of an electron tube

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10286512A (en) * 1997-02-14 1998-10-27 Ngk Insulators Ltd Method for forming coat and coat-forming part
EP1063668A2 (en) * 1999-06-22 2000-12-27 Nec Corporation Cathode subassembly and color crt equipped therewith
EP1063668A3 (en) * 1999-06-22 2004-09-08 NEC Electronics Corporation Cathode subassembly and color crt equipped therewith
EP1367620A1 (en) * 2002-05-31 2003-12-03 Thomson Licensing S.A. Cathode emissive body for an impregnated cathode of an electron tube
FR2840450A1 (en) * 2002-05-31 2003-12-05 Thomson Licensing Sa CATHODO-EMISSIVE BODY FOR CATHODE IMPREGNATED WITH ELECTRONIC TUBE
CN100353476C (en) * 2002-05-31 2007-12-05 汤姆森许可贸易公司 Cathode emitter of electronic tube immersed cathod

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