JPH0457057B2

JPH0457057B2 -

Info

Publication number: JPH0457057B2
Application number: JP57120471A
Authority: JP
Inventors: Yoshihiro Kato
Original assignee: Tokyo Shibaura Electric Co Ltd
Current assignee: Toshiba Corp
Priority date: 1982-07-13
Filing date: 1982-07-13
Publication date: 1992-09-10
Also published as: JPS5912536A

Description

【発明の詳細な説明】〔発明の技術的分野〕この発明は、電子管に使用する傍熱形陰極用ヒ
ータの製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for manufacturing an indirectly heated cathode heater used in an electron tube.

[Technical background of the invention and its problems]

陰極線管、例えばカラー受像管に使用される傍
熱形陰極には、第１図に示すような傍熱形陰極用
のヒータが装着される。このヒータ２１は、所定
長さのタングステン線またはレニウム入りタング
ステン線の直線またはコイル線からなるヒータ素
材を、後述する巻線装置により、ヒータコイル部
２２、およびヒータ脚部２３に整形し、ヒータコ
イル部２２およびヒータ脚部２３の一部にアルミ
ナなどの絶縁部材２２ａを塗布したものである。
このヒータ２１は、脚部２３が図示しない受像管
電子銃構体のラグに溶接され、主としてヒータコ
イル部２２が陰極スリーブ内に挿入され、ラグを
介して電流が流される。それによつて、陰極スリ
ーブの頂部の基体金属上に被着された熱電子放射
物質が加熱されて、熱電子が放出される。 A heater for an indirectly heated cathode as shown in FIG. 1 is attached to an indirectly heated cathode used in a cathode ray tube, for example, a color picture tube. This heater 21 is made by shaping a heater material made of a straight or coiled tungsten wire or rhenium-containing tungsten wire of a predetermined length into a heater coil portion 22 and a heater leg portion 23 using a winding device to be described later. An insulating member 22a such as alumina is applied to a portion of the section 22 and the heater leg section 23.
In this heater 21, leg portions 23 are welded to lugs of a picture tube electron gun assembly (not shown), and a heater coil portion 22 is mainly inserted into a cathode sleeve, and a current is passed through the lugs. Thereby, the thermionic emissive material deposited on the base metal on top of the cathode sleeve is heated and thermionic electrons are emitted.

このような傍熱形陰極用ヒータの巻線方法とし
ては、例えば特開昭56−147341号公報、あるいは
特開昭57−87044号公報に開示された方法が知ら
れている。前者の公報に開示されているヒータ巻
線方法は、第２図に示すような、先端に凹溝２４
が形成されたマンドレル２５、およびスリーブ２
６を使用して巻く方法である。スリーブ２６に
は、中心にマンドレル２５が挿通される透孔２７
が形成されているとともに、先端にヒータ素材を
案内するための横方向のガイド溝２８、および外
周の一部に軸方向の送り溝２９が軸対称的に形成
されている。そして、第３図に示すように、スリ
ーブ２６の外径寸法よりも小さい内径寸法を有す
る作業孔３０を有する台３１を使用してヒータを
巻線する。すなわち、台３１の作業孔３０の上に
ヒータ素材を置き、マンドレル２５およびスリー
ブ２６の各先端の溝にヒータ素材を係止させる。
次に、マンドレル２５を所定んも回転速度および
図示下方への進行速度で、回転、進行させ手ヒー
タコイル部を形成する。この過程では、スリーブ
２６が上方のスプリング３３で先端面が台３１の
上面の作業孔３０のまわりに押付けられており、
そのガイド溝から引込まれたヒータ素材３２がマ
ンドレル２５の外周に巻き付けられて行く。そし
て、ヒータ脚部２３を形成する段階では、第４図
に示すように、スリーブ２６がそのままの状態
で、回転が停止されたマンドレル２５だけを図の
下方に直進させる。それによつて、ヒータ素材３
２のヒータ脚部となる両端部２３が、スリーブ２
６の軸方向の送り溝２９に一部が入るとともに、
マンドレル２５と台３１の作業孔３０の内面との
間を軸方向に絞り込まれてほぼ平行なヒータ脚部
が整形される。 As a winding method for such an indirectly heated cathode heater, the method disclosed in, for example, JP-A-56-147341 or JP-A-57-87044 is known. The heater winding method disclosed in the former publication has a concave groove 24 at the tip as shown in FIG.
mandrel 25 and sleeve 2 formed with
This is a method of winding using 6. The sleeve 26 has a through hole 27 in the center through which the mandrel 25 is inserted.
In addition, a lateral guide groove 28 for guiding the heater material at the tip and an axial feed groove 29 are axially symmetrically formed in a part of the outer periphery. Then, as shown in FIG. 3, the heater is wound using a table 31 having a working hole 30 having an inner diameter smaller than the outer diameter of the sleeve 26. That is, the heater material is placed on the working hole 30 of the table 31, and the heater material is locked in the grooves at the tips of the mandrel 25 and the sleeve 26.
Next, the mandrel 25 is rotated and advanced at a predetermined rotational speed and downward movement speed as shown in the figure to form a hand heater coil portion. In this process, the tip end of the sleeve 26 is pressed around the working hole 30 on the top surface of the table 31 by the upper spring 33.
The heater material 32 drawn through the guide groove is wound around the outer periphery of the mandrel 25. At the stage of forming the heater legs 23, as shown in FIG. 4, only the mandrel 25 whose rotation has been stopped is moved straight downward in the figure while the sleeve 26 remains as it is. Accordingly, the heater material 3
Both ends 23 that become the heater legs of sleeve 2
A portion enters the axial feed groove 29 of No. 6, and
The space between the mandrel 25 and the inner surface of the working hole 30 of the stand 31 is squeezed in the axial direction to form substantially parallel heater legs.

ところで、このような従来方法によると、第５
図に示すように、ヒータ脚部２３の整形過程で、
マンドレル２５のみを進行させるので、ヒータコ
イル部２２のピツチが点線で示したコイル整形過
程での規定ピツチから不所望に粗いピツチに変化
してしまいやすいことがわかつた。この現象は、
ヒータ脚部２３を軸に高精度に平行に整形するた
めにマンドレル２５と台３１の作業孔３０の内面
との間で強く拘束しながら絞り込んで整形すれば
するほど、このヒータ脚部でマンドレル外周のヒ
ータコイル部を引つ張る力が強くなり、コイルピ
ツチが大きく変化してしまう。 By the way, according to such conventional methods, the fifth
As shown in the figure, in the process of shaping the heater legs 23,
It has been found that since only the mandrel 25 is advanced, the pitch of the heater coil portion 22 tends to change from the prescribed pitch shown by the dotted line during the coil shaping process to an undesirably coarse pitch. This phenomenon is
The more tightly the mandrel 25 and the inner surface of the working hole 30 of the stand 31 are tightened and shaped, in order to shape the heater leg 23 parallel to the axis with high precision, the more the heater leg can be shaped in parallel with the mandrel outer periphery. The pulling force on the heater coil becomes stronger, and the coil pitch changes significantly.

一方、上記後者、すなわち特開昭57−87044号
公報に開示された巻線方法は、第６図に示すよう
に、一対のガイド溝３５，３６を有するガイドダ
イス３７とマンドレル２５を使用する方法であ
る。まず、マンドレル２５の先端凹溝２４にヒー
タ素材３２を係止してガイドダイス３７の透孔３
８に通す。この時、ヒータ素材３２の両側をガイ
ド溝３５，３６に入れる。マンドレル２５の先端
およびその凹溝２４に係止されたヒータ素材３２
が、ガイドダイス３７の反対側から突き出た時点
から、マンドレル２５を回転しながら矢印の如く
図の下方に進行させてヒータコイル部２２を形成
する。そして、ヒータコイル部２２の終端位置で
マンドレル２５の回転を止め、コイル部が戻らな
いように別に用意したモリブデン細線を巻き付け
る。この状態で、マンドレル２５を矢印の方向に
さらに進行させてヒータ脚部を整形する方法であ
る。このヒータ巻線方法も、ヒータ素材をガイド
溝３５，３６に入れてここで拘束しながらマンド
レル２５のみを進行させてヒータ脚部を整形する
方法であるため、ヒータコイル部２２のピツチが
変化しないように別に用意したモリブデン細線等
でコイル部の端部を縛る工程が必要である。この
コイルピツチの変化を防止する手段を講じなけれ
ば、上記前者の巻線方法で説明したように、やは
りヒータコイル部のコイルピツチの変化、乱れが
発生してしまうという不都合がある。 On the other hand, the latter method, that is, the winding method disclosed in Japanese Patent Application Laid-Open No. 57-87044, uses a mandrel 25 and a guide die 37 having a pair of guide grooves 35 and 36, as shown in FIG. It is. First, the heater material 32 is locked in the groove 24 at the tip of the mandrel 25, and the through hole 3 of the guide die 37 is
Pass to 8. At this time, both sides of the heater material 32 are inserted into the guide grooves 35 and 36. The heater material 32 is engaged with the tip of the mandrel 25 and its groove 24.
From the point where the mandrel 25 protrudes from the opposite side of the guide die 37, the mandrel 25 is rotated and moved downward in the figure as shown by the arrow to form the heater coil portion 22. Then, the rotation of the mandrel 25 is stopped at the end position of the heater coil section 22, and a separately prepared thin molybdenum wire is wound around the coil section so that the coil section does not return. In this state, the mandrel 25 is further advanced in the direction of the arrow to shape the heater leg. This heater winding method is also a method in which the heater material is placed in the guide grooves 35 and 36 and restrained there while only the mandrel 25 is advanced to shape the heater legs, so the pitch of the heater coil portion 22 does not change. It is necessary to tie the end of the coil part with a separately prepared thin molybdenum wire or the like. Unless measures are taken to prevent this change in coil pitch, there will still be a problem in that the coil pitch of the heater coil section will change and become disordered, as explained in the former winding method.

[Purpose of the invention]

この発明は、以上のような従来方法の不都合を
解消し、比較的簡単な巻線装置および操作でヒー
タコイル部のコイルピツチの変化を防止して高精
度に且つ能率的にヒータを整形できる傍熱形陰極
用ヒータの製造方法を提供することを目的とす
る。 This invention eliminates the disadvantages of the conventional methods as described above, and provides indirect heating that prevents changes in the coil pitch of the heater coil section and shapes the heater with high precision and efficiency using a relatively simple winding device and operation. An object of the present invention is to provide a method for manufacturing a shaped cathode heater.

[Summary of the invention]

この発明は、ヒータ巻線工程において通孔部の
一部に内方に突出する一対の第１位置決め突出部
を有するダイ、先端に凹溝を有するマンドレル、
およびこのマンドレルのまわりにこのマンドレル
が回転可能で且つ相互に独立して軸方向に進退可
能に嵌合されるとともに外周に一対の第２位置決
め突出部が設けられ且つダイの通孔部内に挿入可
能な寸法を有するスリーブを用い、まずヒータ素
材の中央部をマンドレルの先端凹溝に係止させ、
次にスリーブ及びマンドレルをヒータ素材の両側
延長部がスリーブの外周両側に軸方向にほぼ沿つ
てＵ字状になるまでダイの通孔部内に挿入し、次
にスリーブを停止したままマンドレルを回転させ
ながら進行させてヒータコイル部を形成し、次に
マンドレルの回転を停止してスリーブ及びマンド
レルを一緒にさらに進行させ前記ヒータ素材の両
端部を前記ダイおよびスリーブの第１位置決め突
出部および第２位置決め突出部を避けた位置の隙
間で絞り込むようにして軸方向に平行なヒータ脚
部を形成する傍熱形陰極用ヒータの製造方法であ
る。 The present invention includes a die having a pair of first positioning protrusions protruding inwardly from a part of the through hole in a heater winding process, a mandrel having a groove at the tip,
The mandrel is fitted around the mandrel so that it can rotate and move back and forth in the axial direction independently of each other, and a pair of second positioning protrusions are provided on the outer periphery, and the mandrel can be inserted into the through hole of the die. Using a sleeve with suitable dimensions, first lock the center part of the heater material into the concave groove at the tip of the mandrel,
Next, insert the sleeve and mandrel into the through hole of the die until the extensions on both sides of the heater material form a U-shape along both sides of the outer circumference of the sleeve, and then rotate the mandrel while keeping the sleeve stationary. The rotation of the mandrel is then stopped and the sleeve and mandrel are further advanced together to align both ends of the heater material with the first and second positioning protrusions of the die and sleeve. This is a method for manufacturing an indirectly heated cathode heater, in which heater legs parallel to the axial direction are formed by narrowing the gap at a position that avoids a protrusion.

[Embodiments of the invention]

以下、この発明の実施例を図面を参照して説明
する。なお、同一部分は同一符号であらわす。 Embodiments of the present invention will be described below with reference to the drawings. Note that the same parts are represented by the same symbols.

この発明の実施に使用するヒータ巻線装置は、
第７図および第８図に示すものである。円筒状の
固定台４１は、先端部に略円形の通孔部４２をも
つ厚肉のダイ４３を有している。ダイ４３は、内
周の中心軸を挟んで対向する位置に、ヒータ素材
の挿入位置を規定するねための一対の第１位置決
め突出部４４，４５が設けられている。一方、先
端に凹溝４６を有するマンドレル４７が、ダイと
同軸上に回転、および進退可能に上方に配置され
ている。 The heater winding device used to implement this invention is
This is shown in FIGS. 7 and 8. The cylindrical fixing base 41 has a thick die 43 having a substantially circular through hole 42 at its tip. The die 43 is provided with a pair of first positioning protrusions 44 and 45 for defining the insertion position of the heater material at opposing positions on the inner periphery with the central axis interposed therebetween. On the other hand, a mandrel 47 having a groove 46 at its tip is arranged above the die so that it can rotate coaxially with the die and move forward and backward.

そこで、マンドレル４７のまわりにスリーブ４
８が嵌合されている。このスリーブ４８は、比較
的薄肉の円筒部４９と、その外周の一部の中心軸
を挟んで対向する位置に、ヒータ素材の挿入位置
を規定するねための一対の第２位置決め突出部５
０，５１が設けられている。またこのスリーブ４
８は、中心透孔５２にマンドレル回転可能に嵌合
されており、しかもダイ４３の通孔部４２の内部
に第１位置決め突出部４４，４５を避けて挿入可
能な寸法、形状を有している。これらマンドレル
４７とスリーブ４８とは、相互に独立して軸方向
に進退可能であり、次のような手順のヒータ巻線
工程で操作される。 Therefore, the sleeve 4 is placed around the mandrel 47.
8 is fitted. This sleeve 48 includes a relatively thin cylindrical portion 49 and a pair of second positioning protrusions 5 for defining the inserting position of the heater material at positions facing each other across the central axis of a part of the outer periphery.
0,51 are provided. Also this sleeve 4
The mandrel 8 is rotatably fitted into the center hole 52 and has a size and shape that allows it to be inserted into the through hole 42 of the die 43 while avoiding the first positioning protrusions 44 and 45. There is. These mandrel 47 and sleeve 48 can move forward and backward in the axial direction independently of each other, and are operated in the heater winding process as follows.

まず、第９図に示すように、ダイ４３の上に所
定長さのヒータ素材３２を載せ、マンドレル４７
の先端凹溝４６にヒータ素材中央部を入れる。こ
の時、スリーブ４８はその下端がダイ４３よりも
高い位置、すなわちヒータ素材３２の上に保持さ
れている。 First, as shown in FIG. 9, the heater material 32 of a predetermined length is placed on the die 43, and the mandrel 47
Insert the center part of the heater material into the groove 46 at the tip. At this time, the lower end of the sleeve 48 is held at a position higher than the die 43, that is, above the heater material 32.

次に、第１０図に示すように、マンドレル４
７、およびスリーブ４８を回転させないままダイ
４３の通孔部４２に、ヒータ素材３２がスリーブ
４８の外周に軸方向にほぼ沿うＵ字状になるまで
挿入する。この状態では、ヒータ素材３２はその
両側延長部がダイ４３とスリーブ４８との間の、
各一対の位置決め突出部を避けた位置の隙間を通
つて図の上方に延長されている。 Next, as shown in FIG.
7, and without rotating the sleeve 48, insert the heater material 32 into the through hole 42 of the die 43 until it forms a U-shape that substantially follows the outer periphery of the sleeve 48 in the axial direction. In this state, the heater material 32 has its both side extensions between the die 43 and the sleeve 48.
It extends upward in the figure through a gap at a position avoiding each pair of positioning protrusions.

次に、第１１図に示すように、スリーブ４８は
そのまま停止して、マンドレル４７を所定ピツチ
で回転下降させ、ヒータコイル部を形成する。そ
して、第１２図に示すように所定巻数のヒータコ
イル部２２を形成した時点で、マンドレル４７の
回転を停止する。 Next, as shown in FIG. 11, the sleeve 48 is stopped and the mandrel 47 is rotated and lowered at a predetermined pitch to form a heater coil portion. Then, as shown in FIG. 12, when a predetermined number of turns of the heater coil portion 22 are formed, the rotation of the mandrel 47 is stopped.

次に、第１３図に示すように、マンドレル４７
およびスリーブ４８を一緒に下降させ、ヒータ脚
部となるヒータ素材の両端部２３をダイ４３とス
リーブ４８との間の隙間で絞り込むようにしてヒ
ータ脚部を整形する。こうして得たヒータの主と
してコイル部にアルミナのような絶縁部材を塗布
して、傍熱形陰極用ヒータを完成する。 Next, as shown in FIG.
Then, the sleeve 48 is lowered together, and both ends 23 of the heater material that will become the heater leg are squeezed in the gap between the die 43 and the sleeve 48, thereby shaping the heater leg. An insulating material such as alumina is applied mainly to the coil portion of the thus obtained heater, thereby completing an indirectly heated cathode heater.

この発明の製造方法によれば、第１２図および
第１３図に示して説明したヒータ脚部を整形する
過程で、ヒータコイル部の巻き終り部分をスリー
ブの下端で実質的に押さえ付けたままヒータ素材
をダイとスリーブとの間の隙間で絞り込むように
マンドレルおよびスリーブを一緒に下降させるた
め、ヒータコイル部のコイルピツチの変化が抑制
される。なお、ヒータ脚部の相互間隔は、ヒータ
コイル部のコイル直径よりも大きくなるが、ヒー
タ脚部が沿うスリーブの円筒部（第７図の符号４
９）の肉厚を薄くすれば、これらヒータ脚部の相
互間隔とヒータコイル部のコイル直径との差を実
用上問題ない程度に小さく止めることが可能であ
る。なお逆に、このスリーブの円筒部の肉厚を適
当に選定することにより、ヒータ脚部の相互間隔
を自動的に定めることができるという副次的な利
点もある。 According to the manufacturing method of the present invention, in the process of shaping the heater leg shown and explained in FIGS. Since the mandrel and sleeve are lowered together so that the material is squeezed in the gap between the die and the sleeve, changes in the coil pitch of the heater coil portion are suppressed. Note that the distance between the heater legs is larger than the coil diameter of the heater coil, but the cylindrical part of the sleeve along which the heater legs lie (reference numeral 4 in FIG. 7)
By reducing the wall thickness of 9), it is possible to keep the difference between the mutual spacing of these heater legs and the coil diameter of the heater coil portion small enough to pose no practical problem. On the other hand, by appropriately selecting the wall thickness of the cylindrical portion of the sleeve, there is a secondary advantage that the mutual spacing between the heater legs can be automatically determined.

〔Effect of the invention〕

以上説明したようにこの発明によれば、比較的
簡単な巻線装置およびその操作手順により、ヒー
タ巻線工程でのコイルピツチの変化が抑制され、
精度の高い傍熱形陰極用ヒータを製造することが
できる。 As explained above, according to the present invention, changes in coil pitch in the heater winding process are suppressed by a relatively simple winding device and its operating procedure.
A highly accurate indirectly heated cathode heater can be manufactured.

[Brief explanation of the drawing]

第１図は、傍熱形陰極用ヒータを示す側面図、
第２図は従来の製法の一例に使用される巻線装置
の要部を示す分解斜視図、第３図および第４図は
それぞれ従来方法を示す要部縦断面図、第５図は
従来方法によるヒータ脚部整形工程を示す要部縦
断面図、第６図は同じく従来方法の他の例を示す
要部斜視図、第７図はこの発明の実施例に使用す
る巻線装置の要部を示す斜視図、第８図はその縦
断面図、第９図乃至第１３図はこの発明の製法を
各工程順に示すそれぞれ要部縦断面図である。４６……先端凹溝、４７……マンドレル、３２
……ヒータ素材、４２……ダイの通孔部、４３…
…ダイ、２１……ヒータ、２２……ヒータコイル
部、２２ａ……絶縁部材、２３……ヒータ脚部、
４４，４５……第１の位置決め突出部、５０，５
１……第２の位置決め突出部、４８……スリー
ブ。 FIG. 1 is a side view showing an indirectly heated cathode heater;
Figure 2 is an exploded perspective view showing the main parts of a winding device used in an example of the conventional manufacturing method, Figures 3 and 4 are vertical sectional views of the main parts showing the conventional method, and Figure 5 is the conventional method. FIG. 6 is a perspective view of a main part showing another example of the conventional method, and FIG. 7 is a main part of a winding device used in an embodiment of the present invention. FIG. 8 is a longitudinal sectional view thereof, and FIGS. 9 to 13 are longitudinal sectional views of essential parts showing the manufacturing method of the present invention in the order of each step. 46... Tip groove, 47... Mandrel, 32
...Heater material, 42...Die hole, 43...
...Die, 21...Heater, 22...Heater coil part, 22a...Insulating member, 23...Heater leg part,
44, 45...first positioning protrusion, 50, 5
1...Second positioning protrusion, 48...Sleeve.

Claims

[Scope of Claims] 1. Put the center part of the heater material into the groove of a mandrel having a groove at the top of the tip, and insert the heater material from the tip into the inside of a die having a through hole so that both side extensions of the heater material are inserted into the groove. The mandrel is bent along the mandrel to form a substantially U-shape, and is inserted into the through hole of the die while rotating the mandrel to form a heater coil portion, and then the rotation of the mandrel is stopped. In the method for manufacturing an indirectly heated cathode heater, the method includes a heater winding step of further advancing the mandrel to form a heater leg, and then a step of applying an insulating material to the obtained coil portion of the heater. , the heater winding process includes the die having a pair of first positioning protrusions protruding inwardly in a part of the through hole, the mandrel, and the mandrel being rotatable around the mandrel and mutually Using a sleeve that is fitted so that it can move back and forth independently in the axial direction, has a pair of second positioning protrusions on its outer periphery, and has dimensions that allow it to be inserted into the through hole of the die, first, the central part of the heater material is is locked in the concave groove at the tip of the mandrel, and then the sleeve and mandrel are inserted into the through hole of the die until the extensions on both sides of the heater material form a U-shape along both sides of the outer periphery of the sleeve in the axial direction. Next, while the sleeve is stopped, the mandrel is rotated and advanced to form a heater coil portion. Next, the rotation of the mandrel is stopped and the sleeve and mandrel are further advanced together to form the heater material. An indirect heating type characterized in that both ends of the die and sleeve are narrowed in a gap at a position avoiding the first positioning protrusion and the second positioning protrusion to form a heater leg parallel to the axial direction. A method for manufacturing a cathode heater.