JPS6035A - Mounting device of electron gun cathode for color cathode-ray tube - Google Patents
Mounting device of electron gun cathode for color cathode-ray tubeInfo
- Publication number
- JPS6035A JPS6035A JP10805083A JP10805083A JPS6035A JP S6035 A JPS6035 A JP S6035A JP 10805083 A JP10805083 A JP 10805083A JP 10805083 A JP10805083 A JP 10805083A JP S6035 A JPS6035 A JP S6035A
- Authority
- JP
- Japan
- Prior art keywords
- cathode
- electrode
- axis
- axis table
- cylinder
- 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
- 238000003466 welding Methods 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 description 6
- 230000004907 flux Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
- H01J9/02—Manufacture of electrodes or electrode systems
- H01J9/18—Assembling together the component parts of electrode systems
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2209/00—Apparatus and processes for manufacture of discharge tubes
- H01J2209/18—Assembling together the component parts of the discharge tube
- H01J2209/185—Machines therefor, e.g. electron gun assembling devices
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
Abstract
Description
【発明の詳細な説明】
この発明は、カラーブラウン管用の電子銃組立工程に於
るカソード数句装置の改良に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a cathode pump device used in an electron gun assembly process for a color cathode ray tube.
電子軌構体の概略は第１図、第２図に示すようにカソー
ド１と＆ｈのグリッド、すなわち第１グリッド２．第２
グリツド３、第３グリツド４等が同一軸上にノ尻建の間
隔で配置され°Ｃいる。The outline of the electron trajectory structure is as shown in FIGS. 1 and 2, consisting of a cathode 1 and a grid of &h, that is, a first grid 2. Second
A grid 3, a third grid 4, etc. are arranged on the same axis at intervals of 100 degrees.
カラーブラウン管（陰極線管）のＭ要な動作特性として
カットオフ電圧がある。このカットオフ電圧はカソード
１と第１グリツド２との間隔（ｌぐＧｓ）による影響が
非常に太きい。従ってカソード１を第１グリツド２′に
対しＣいかに精度よく間隔を保って取付けるかが重要に
なる。A cutoff voltage is an important operating characteristic of a color cathode ray tube (cathode ray tube). This cutoff voltage is greatly influenced by the distance (lgGs) between the cathode 1 and the first grid 2. Therefore, it is important to mount the cathode 1 with respect to the first grid 2' with an accurate spacing.
従来のカソード取付方法は第１図に示すように前工程に
於いて各グリッドとカソード支持体５の組立がすでに完
了されている電子銃内に進退自由自在のエアーマイクロ
メーターノズル６が嵌合されている。電子銃ガイド芯棒
７に挿入し、次いで一定の長さ脚部を有するカソード取
付相ケー２８を図示入方向より挿入し、該脚部を第１グ
リツド２の端面に接触させた状態でエアーマイクロメー
ターノズル６を前進させ規定の間隔（ＫＯ＋）を辿ｊ定
後、該ノズル６の送りを止め前記取付用ゲージ８を引き
抜いた。In the conventional cathode mounting method, as shown in FIG. 1, an air micrometer nozzle 6 that can freely move forward and backward is fitted into an electron gun in which each grid and cathode support 5 have already been assembled in the previous process. ing. The electron gun guide core rod 7 is inserted into the electron gun guide core rod 7, and then the cathode mounting companion case 28 having legs of a certain length is inserted from the direction shown in the drawing, and with the legs in contact with the end surface of the first grid 2, the air micro After moving the meter nozzle 6 forward and following a specified interval (KO+), feeding of the nozzle 6 was stopped and the mounting gauge 8 was pulled out.
その後、第２図に示すようにカソード１をカソード電極
芯棒９に被せて、エアーマイクロメーターノズル６で間
隔位置を測定しながら図示方向より挿入し、規定の間隔
（ＫＧＩ）で動作を止め両サイド溶接電極１０を矢印Ｂ
方向に加圧することで、カソード１をカソード支持体５
に溶着を行っＣきた。Thereafter, as shown in FIG. 2, the cathode 1 is placed over the cathode electrode core rod 9, and inserted from the direction shown while measuring the spacing position with the air micrometer nozzle 6. The operation is stopped at a specified spacing (KGI) and both are inserted. Arrow B indicates the side welding electrode 10.
By applying pressure in the direction, the cathode 1 is attached to the cathode support 5
I welded it to C.
しかし、上記組立方法に於いてはカソード１を規定の間
隔に挿入して溶着を行っても溶着時の加圧の影響や前工
程により電子銃として組立てられた側（カソード支持体
側）とカソードｌを挿入する側との機械的センター位置
精度は正確であるがカソード１を挿入される側、いわゆ
るカソード支持体５に第３図より示さ扛る通り機械的セ
ンター位置Ｍ１〜■４に対しα宜〜α４のように製品的
なバラツキが発生しているため、挿入時、仮にカソード
１がカソード支持体５に挿入されエアーマイクロメータ
で間隔（ＫＧＩ）を測定しながら無理矢理」１１人され
た状態で浴着することによりカソード１が第１グリツド
２より微少移動してしまい、溶着前後では測定値に大幅
な相違が生じた。以上のような要因によりカソード１と
第１グリツド２との間隔（ＫＧｌ） 精度が悪くなると
いう問題が起った。However, in the above assembly method, even if the cathode 1 is inserted at a specified interval and welded, the side assembled as an electron gun (cathode support side) and the cathode l due to the influence of pressure during welding and the previous process. Although the mechanical center position accuracy is accurate with respect to the side where the cathode 1 is inserted, the so-called cathode support 5, as shown in FIG. ~ Since product variations occur as shown in α4, when inserting the cathode 1, it is assumed that the cathode 1 is inserted into the cathode support 5 and 11 people are forced to insert it into the cathode support 5 while measuring the distance (KGI) with an air micrometer. Due to the bath welding, the cathode 1 moved slightly from the first grid 2, resulting in a large difference in the measured values before and after welding. Due to the above-mentioned factors, a problem occurred in that the accuracy of the distance (KGl) between the cathode 1 and the first grid 2 deteriorated.
本発明の目的は、前記従来技術の欠点に鑑みなされたも
ので、カソード支持体５を基準とし′Ｃ、カソード支持
体５へのカソード１の挿入を僚械的センター位置のみに
依存する事により起るカソード支持体のバラツキを考鳥
、することで無理な負荷を与えず、カソード支持体５に
カソード１が無理なく簡単に且つ都度を保って挿入でき
る事、まだ両サイド電極１０の加圧時においてカソード
支持体５に無理な負荷を与えずカソード１を溶着するこ
とでカソード１と第１グリツド２の間隔は規定設定値（
ＫＯ＋）に保たれ電子銃を精度よく組立てる方法および
その装置を提供するものである。The object of the present invention has been made in view of the above-mentioned drawbacks of the prior art. By taking into consideration the variations in the cathode support that may occur, it is possible to insert the cathode 1 into the cathode support 5 effortlessly and easily without applying an unreasonable load, and to maintain the pressure on both side electrodes 10. At times, by welding the cathode 1 without applying an unreasonable load to the cathode support 5, the distance between the cathode 1 and the first grid 2 can be set to a specified value (
The present invention provides a method and apparatus for assembling an electron gun with high precision while maintaining the KO+).
本発明によれば、カソード１を保持し且つ、浴接ヘッド
の原点位置を決めるカソード原点位置電極部と、カソー
ド１を挿入する該電極部の自在可動部と該自在可動部に
追従し動作する加圧部とから構成されることを特徴とす
るカラーブラウン管電子銃カソードの挿入および取付装
置が得られる。According to the present invention, there is a cathode origin position electrode part that holds the cathode 1 and determines the origin position of the bath contact head, a freely movable part of the electrode part into which the cathode 1 is inserted, and a movable part that follows the freely movable part. There is obtained a color cathode ray tube electron gun cathode insertion and attachment device characterized by comprising a pressurizing section.
以下図面に基づき本発明を評ｆｌ＋１１１に費、明する
。第４図は本発明によるカラーブラウン管用電子銃組立
工程に於るカソード取付装置の電子銃カソードの挿入及
び取付方法の改良に共なう、カソード原点位置電極部と
該電極部の自在可動部および該自在可動部に追従する加
圧部の一実施例の概要を示す模式的な正面図である。第
５図および第６図は上記概−要き示す模式的な平面図お
よび右側面図である。９はカソード１をカソード支持体
５に取付けるまでカソード１を吸着し保持するカソード
電極芯棒でめる。７ｊソード電極芯棒９は先端電極９ａ
と先端電極連結１１ｉ１１Ｊ ９ ｂより構成され′〔
いる。先端部センター案内＆１３０は支持台３７に嵌合
された案内軸３８を介し、真空吸引穴を有する連結棒２
９を連結し各々先端電極９ａにカソード１を吸着できる
ような構造を設け°Ｃある。カソード１をカソード電極
芯棒９に吸着保持させカソード支持体５に挿入しエアー
マイクロメーターでＫＧｌＩＩｋを測定する。測定終了
後Ｚ 羽ｉ＋ （第６図）自在可動用シリンダー３１を
後退させることにより連動棒２６と連結棹２９が動作す
ることで先端部センター案内軸３０と先端電極連結軸９
ｂのテーパ一部の接触部を断つことによりＺ軸テーブル
１９ａと先端電極連結軸９ｂはＺ軸方向に関して自在な
状態となるようにＸ軸テーブル１８ａ、Ｚ軸ベッド１９
ｂに直線用ガイドローラー２１を介し、シリンダ２４の
ロッド２２をＺ軸テーブル１９ａの下部に取付けるシリ
ンダ２４は通常市販されている複動シリンダと同様な形
状を伽えているが圧縮空気をロッド側２２とピストン側
２３０両方から入れることが特徴である。つまり、シリ
ンダ推力は商面積の差で発生する推力となる。この推力
はＺ軸テーブル１９ａに取付けられた先端型＆９ａ、先
端電極連結軸９ｂ及び該テーブル１９ａの鉛直方向の束
量とシリンダ推力とが打ち消し合い、力の釣り合いの状
態にすることを目的とするもので圧縮空気圧力をレギー
レーターで調節することで得られるような構造となって
いる。上記操作を行なうことでＺ軸テーブル１９ａ、先
端電極９ａおよび先端電極連結軸９ｂがカソード支持体
に与えるＺ軸方向（鉛直）負荷はゼロにすることが可能
となる。The present invention will be explained below based on the drawings. FIG. 4 shows the cathode origin position electrode part, the freely movable part of the electrode part, and FIG. 3 is a schematic front view showing an outline of an embodiment of a pressurizing section that follows the freely movable section. 5 and 6 are a schematic plan view and right side view showing the above-mentioned outline. 9 is a cathode electrode core rod that attracts and holds the cathode 1 until the cathode 1 is attached to the cathode support 5. 7j Sword electrode core rod 9 is the tip electrode 9a
and a tip electrode connection 11i11J9b'
There is. The tip center guide &130 connects the connecting rod 2 with a vacuum suction hole through a guide shaft 38 fitted to a support stand 37.
A structure is provided in which the cathodes 9 are connected to each other so that the cathode 1 can be adsorbed to the tip electrode 9a. The cathode 1 is adsorbed and held on the cathode electrode core rod 9, inserted into the cathode support 5, and KGlIIk is measured using an air micrometer. After the measurement is completed, Z wing i+ (Fig. 6) By retracting the freely movable cylinder 31, the interlocking rod 26 and the connecting rod 29 move, and the tip center guide shaft 30 and the tip electrode connecting shaft 9 are moved.
The X-axis table 18a and the Z-axis bed 19 are moved so that the Z-axis table 19a and the tip electrode connecting shaft 9b can be freely moved in the Z-axis direction by cutting off a part of the contact portion of the taper b.
The cylinder 24, in which the rod 22 of the cylinder 24 is attached to the lower part of the Z-axis table 19a via the linear guide roller 21, has the same shape as a commercially available double-acting cylinder, but the compressed air is transferred to the rod side 22. It is characterized by being able to enter from both the piston side 230 and the piston side 230. In other words, the cylinder thrust is the thrust generated by the difference in quotient areas. The purpose of this thrust is to create a state of force balance in which the vertical flux of the tip mold &9a attached to the Z-axis table 19a, the tip electrode connection shaft 9b, and the table 19a cancel each other out, and the cylinder thrust force is balanced. It has a structure that allows the compressed air pressure to be adjusted using a regirator. By carrying out the above operation, the Z-axis direction (vertical) load applied to the cathode support by the Z-axis table 19a, the tip electrode 9a, and the tip electrode connection shaft 9b can be reduced to zero.
同時に、Ｚ軸方向ではどの位置でも無負荷な状態を保持
できる。Ｘ軸方向はフランジ３９面にＸ軸ヘッド１８ｂ
とＸ軸テーブル１８ａは直線用ガイドローラー２０を介
して取付けられている。Ｘ軸テーブル１８ａの原点位置
出しはＺ軸自在可動用シリンダ３１０誤り１作すること
によシ、連動棒２６の先端にローラーを設けてガイドと
してＸ軸テーブル１８ａに取付けであるカム２５により
該Ｘ軸テーブル１８ａの原点位餉を出す。連動棒２７に
は溶接電極加圧用カム３４の連結棒３５が取付けられ加
圧用シリンダ２８が後退することにより加圧用カム３５
の面をローラー１６がころがりスプリング１７の力によ
り加圧連結棒１３が加圧受台１５の支点１４を中心にカ
ソードを加圧する。加圧用シリンダ２８の後退時に関し
ての動作順序は次の辿りである。シリンダ３１の後退に
より連動棒２６が矢印Ｃ方向へ後退しカム２５よりはず
扛るこの時点でＸ軸はＸ軸方向へ自在可動の状態を保持
することになる。次に加圧用シリンダ２８が後退し°Ｃ
電極加圧用カム３４により両サイド電極１０の加圧が始
まる加圧受台１５はＸ軸テーブル上に取付けられである
ため電極１０はＸＩＩＩＩＩｌに自在可動なため加圧時
には両サイド電極ｌＯかカソード支持体に追従して加圧
づれ且つカソード電極芯枠９はＸ、Ｚ方向に自在可動に
動作する。以上の動作によりカソード支持体５およびカ
ソード］に負荷を与えず挿入し取付けることが可能とな
った。At the same time, a no-load state can be maintained at any position in the Z-axis direction. In the X-axis direction, the X-axis head 18b is placed on the flange 39 surface.
and the X-axis table 18a are attached via linear guide rollers 20. The origin position of the X-axis table 18a can be determined by operating the Z-axis freely movable cylinder 310. A roller is provided at the tip of the interlocking rod 26, and a cam 25 attached to the X-axis table 18a serves as a guide. Bring out the origin position of the shaft table 18a. A connecting rod 35 of a welding electrode pressurizing cam 34 is attached to the interlocking rod 27, and when the pressurizing cylinder 28 moves back, the pressurizing cam 35 is attached to the interlocking rod 27.
As the roller 16 rolls on the surface of the cathode, the pressure connecting rod 13 presses the cathode around the fulcrum 14 of the pressure holder 15 due to the force of the spring 17. The sequence of operations when the pressurizing cylinder 28 is retracted is as follows. As the cylinder 31 retreats, the interlocking rod 26 retreats in the direction of arrow C and is dislodged from the cam 25. At this point, the X-axis remains freely movable in the X-axis direction. Next, the pressurizing cylinder 28 retreats to °C.
Pressure on both side electrodes 10 is started by the electrode pressurizing cam 34. Since the pressurizing stand 15 is mounted on the X-axis table, the electrodes 10 can freely move in XIIIIIIl, so when pressurizing both side electrodes 10 or cathode support Following this, the cathode electrode core frame 9 moves freely in the X and Z directions as the pressure shifts. Through the above operations, it became possible to insert and attach the cathode support 5 and the cathode without applying any load.
この発明により、溶着時の加圧の影響は発生せず、溶着
前後のカソード１と第１グリツド２との間隔（ＫＧｌ）
の測定値は一定になり、製品品質向上が図れるという優
位性を有している。With this invention, the influence of pressure during welding does not occur, and the distance (KGl) between the cathode 1 and the first grid 2 before and after welding
It has the advantage of keeping the measured value constant and improving product quality.
第１図は取付ケージによるカソードと第１グリツドとの
間隔測定時の電子銃部分拡大の断面図、第２図はカソー
ド取付時の部分拡大の断面図、第３図はカソードを保持
する機械センターとカソード支持体とのバラツキの拡大
図である。第４図ｄ：本発明によるカソード原点位置ｔ
ｍ部とカソードを挿入する該電極部の自在可動部と該自
在可動部に追従する加圧部の構成説明のための概略正面
図、第５図は上記構成説明のための概略平面図、第６図
社上記構成説明のための概略右側面図を示す。
■・・・・・・カソード、２・・・・・・第１グリ、ド
、３・・・・・・第２グリツド、４・・・・・・第３グ
リツド、５・・・・・・カソード支持体、６・・・・・
・エアーマイクロメーターノズル、７・・・・・・カイ
ト芯枠、８・・・・・・カソード取付用ゲージ、９・・
・・・・カソード電極芯枠、９ａ・・・・・・先端電極
、９ｂ・・・・・・先端電極連結軸、１０・・・・・・
サイド溶接電極、１１・・・・・・溶接体板、１２・・
・・・・絶縁材、１３・・・・・・加圧浬結棒、１４・
・・・・・支点、１５・・・・・・加圧受台、１６・・
・・・・ローラー、１７・・・・・・スズリング（加圧
用）、１８ａ・・・・・・Ｘ軸テーブル、１８ｂ・・・
・・・Ｘ軸ペッド、１ ｇ ａ ′°゛°°Ｚ軸テーブ
ル、１９ｂ−・・・・・Ｚ軸ベッド、２０・・・・・・
直線用ガイドローラー、２１・・・・・・Ｍｆｍ用カイ
トローラー、２２・・・・・・ロッド、２３・・・・・
・ピストン、２４・・・・・・シリンダ、２５・・・・
・・カム、２６・・・・・・連動棒、２７・・・・・・
連動棒、２８・・・・・・加圧用シリンダ、２９・・・
°・°連結棒、３０・°・・°・先端部センター案内軸
、３１・・・・・・自在可動用シリンダ、３２・・・・
・・連結棒、３３・・・・・・シリンダ取付板、３４・
・・・・・電極加圧用カム、３５・・・・・・加圧力ム
連結杵、３６°°°゛°スペーサー、３７・・・・・・
支持台、３８・・・・・・案内軸、３９・・・・・・フ
ランジ。
７・′、−１
五・−ハ
代１Ａ 弁理′″） ｔ′ｑ ” ・、・・′ツ、３Ｚ
２７
第、Ｓ 図
１４４−
第 ６７Figure 1 is an enlarged sectional view of the electron gun when measuring the distance between the cathode and the first grid using the mounting cage, Figure 2 is an enlarged sectional view of the part when the cathode is installed, and Figure 3 is the mechanical center that holds the cathode. FIG. 3 is an enlarged view of the variation between the cathode support and the cathode support. Figure 4d: Cathode origin position t according to the invention
FIG. 5 is a schematic front view for explaining the structure of the freely movable part of the electrode part into which the m part and the cathode are inserted, and the pressurizing part that follows the freely movable part; FIG. 5 is a schematic plan view for explaining the above structure; 6. A schematic right side view for explaining the above configuration is shown. ■...Cathode, 2...1st grid, 3...2nd grid, 4...3rd grid, 5...・Cathode support, 6...
・Air micrometer nozzle, 7... Kite core frame, 8... Cathode mounting gauge, 9...
...Cathode electrode core frame, 9a...Tip electrode, 9b...Tip electrode connection shaft, 10...
Side welding electrode, 11... Welding body plate, 12...
... Insulating material, 13 ... Pressure connection rod, 14.
...Fully point, 15...Pressure pedestal, 16...
...Roller, 17...Stin ring (for pressure), 18a...X-axis table, 18b...
...X-axis ped, 1g a'°゛°°Z-axis table, 19b-...Z-axis bed, 20...
Straight line guide roller, 21... Mfm kite roller, 22... Rod, 23...
・Piston, 24...Cylinder, 25...
...Cam, 26...Interlocking rod, 27...
Interlocking rod, 28... Pressure cylinder, 29...
°・°Connecting rod, 30・°・・°・Tip center guide shaft, 31・・・・Freely movable cylinder, 32・・・・
・・Connecting rod, 33・・・・Cylinder mounting plate, 34・
...Electrode pressure cam, 35...Press dam connecting punch, 36°°°゛°spacer, 37...
Support stand, 38... Guide shaft, 39... Flange. 7・', -1 5・-c 1A Patent Attorney''') t'q ''・,...'TS, 3Z
27th, S Figure 144- No. 67
Claims (1)
ソード原点位置電極部と、カソードを挿入する該電極部
の自在可動部と、該自在可動部に追従し動作する加圧部
とから構成されることを特徴とするカラーブラウン管電
子絖カソードの取付装Ｍ。It is composed of a cathode origin position electrode part that holds the cathode and determines the origin position of the welding head, a freely movable part of the electrode part into which the cathode is inserted, and a pressurizing part that follows and operates the freely movable part. Color cathode ray tube electronic cathode mounting equipment M featuring the following.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10805083A JPS6035A (en) | 1983-06-16 | 1983-06-16 | Mounting device of electron gun cathode for color cathode-ray tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10805083A JPS6035A (en) | 1983-06-16 | 1983-06-16 | Mounting device of electron gun cathode for color cathode-ray tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6035A true JPS6035A (en) | 1985-01-05 |
Family
ID=14474650
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10805083A Pending JPS6035A (en) | 1983-06-16 | 1983-06-16 | Mounting device of electron gun cathode for color cathode-ray tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6035A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60235323A (en) * | 1984-05-07 | 1985-11-22 | Nec Corp | Electron gun cathode attaching device for color cathode ray tube |
| JPS6271142A (en) * | 1985-09-25 | 1987-04-01 | Mitsubishi Electric Corp | Welder for cathode of electron gun |
| JPS6351027A (en) * | 1986-08-19 | 1988-03-04 | Mitsubishi Electric Corp | Cathode assembling device for electrode gun |
-
1983
- 1983-06-16 JP JP10805083A patent/JPS6035A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60235323A (en) * | 1984-05-07 | 1985-11-22 | Nec Corp | Electron gun cathode attaching device for color cathode ray tube |
| JPS6271142A (en) * | 1985-09-25 | 1987-04-01 | Mitsubishi Electric Corp | Welder for cathode of electron gun |
| JPS6351027A (en) * | 1986-08-19 | 1988-03-04 | Mitsubishi Electric Corp | Cathode assembling device for electrode gun |
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