JPH0554822A - Cathode-ray tube and manufacture of electron gun - Google Patents

Cathode-ray tube and manufacture of electron gun

Info

Publication number
JPH0554822A
JPH0554822A JP21503191A JP21503191A JPH0554822A JP H0554822 A JPH0554822 A JP H0554822A JP 21503191 A JP21503191 A JP 21503191A JP 21503191 A JP21503191 A JP 21503191A JP H0554822 A JPH0554822 A JP H0554822A
Authority
JP
Japan
Prior art keywords
electrode
electron gun
mandrel
hole diameter
hole
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
JP21503191A
Other languages
Japanese (ja)
Inventor
Yukio Koizumi
幸生 小泉
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP21503191A priority Critical patent/JPH0554822A/en
Publication of JPH0554822A publication Critical patent/JPH0554822A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To enhance focus characteristics and to prevent generation of grid emissions by making the aperture of a G1 electrode smaller than that of a G2 electrode, the G1 and G2 electrodes forming a control electrode and an accelerating electrode, respectively. CONSTITUTION:The aperture of a G1 electrode 21 which serves as a control electrode is larger than that of a G2 electrode 22 which serves as an accelerating electrode. Focus characteristics on a fluorescent screen are such that a crossover aperture focused by a prefocus lens system comprising a cathode 20 and the G1-G3 electrodes 21-23 is focused on the fluorescent screen by a main lens system. Therefore the larger the main lens aperture and the smaller the crossover aperture, the better the focus characteristics, and the crossover aperture is almost proportional to the aperture of the electrode 22 and the focus characteristics are enhanced by reducing the crossover aperture. By making the aperture of the electrode 22 smaller than that of the electrode 21 penetration of the electric potential of the electrode 23 into the hole of the electrode 21 is restrained so that generation of grid emissions is restrained.

Description

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

【0001】[0001]

【産業上の利用分野】本発明はカラー映像表示に用いる
陰極線管及び電子銃製造方法に係り、特に電子銃構体及
びその組立治具に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cathode ray tube used for color image display and an electron gun manufacturing method, and more particularly to an electron gun assembly and a jig for assembling the same.

【0002】[0002]

【従来の技術】カラー映像表示に用いる陰極線管(以下
カラーブラウン管という)は、映像スクリーンであるパ
ネル部、電子銃を収納するネック部及びパネル部とネッ
ク部を連結するファンネル部とから構成され、上記ファ
ンネル部分には電子銃から発射された電子ビームをパネ
ル内面に塗布形成された蛍光面上を走査させる偏向装置
が装着される。
2. Description of the Related Art A cathode ray tube used for displaying a color image (hereinafter referred to as a color cathode ray tube) is composed of a panel portion which is an image screen, a neck portion for accommodating an electron gun, and a funnel portion for connecting the panel portion and the neck portion, A deflection device is mounted on the funnel portion to scan an electron beam emitted from an electron gun on a phosphor screen coated and formed on the inner surface of the panel.

【0003】上記ネック部内に収納される電子銃は、陰
極、制御電極、加速電極、集束電極等の各種の電極を備
え、陰極からの電子ビームを制御電極に印加される信号
で変調し、加速、集束電極を通して所要の断面形状とエ
ネルギーを付与して、上記蛍光面に射突させる。電子ビ
ームは、電子銃から蛍光面に達する途上において、ファ
ンネル部に設けた前記偏向装置により、水平方向、垂直
方向の偏向を受けることで、蛍光面上に映像を形成する
ものである(特開昭59ー215640号公報)。
The electron gun housed in the neck portion has various electrodes such as a cathode, a control electrode, an accelerating electrode, and a focusing electrode, and an electron beam from the cathode is modulated by a signal applied to the control electrode to accelerate the electron beam. A desired cross-sectional shape and energy are applied through the focusing electrode so that the fluorescent surface is bombarded. The electron beam is deflected in the horizontal direction and the vertical direction by the deflecting device provided in the funnel portion on the way from the electron gun to the phosphor screen, thereby forming an image on the phosphor screen. Sho 59-215640).

【0004】従来の制御、加速、集束電極は、各々G1
電極、G2電極、G3電極より構成され、その孔径はG
1電極よりG2電極が大きいか又は等しく、またG2電
極よりG3電極が大きいか又は等しく形成されている。
集束電極の孔径を大きくするのは、静電レンズの収差を
小さくし、良好なフォーカス特性を得るためであり、G
1、G2、G3電極から成るプリフォーカス系の孔径が
小さいのは、主に電子銃組立治具のマンドレルの構造と
小さなクロスオーバ径を得るためである。
Conventional control, acceleration, and focusing electrodes are each G1
Electrode, G2 electrode, G3 electrode, the hole diameter is G
The G2 electrode is larger than or equal to one electrode, and the G3 electrode is larger than or equal to the G2 electrode.
The reason for increasing the hole diameter of the focusing electrode is to reduce the aberration of the electrostatic lens and obtain good focus characteristics.
The reason why the prefocus system composed of the 1, G2, and G3 electrodes has a small hole diameter is mainly to obtain the structure of the mandrel of the electron gun assembly jig and a small crossover diameter.

【0005】[0005]

【発明が解決しようとする課題】上記従来技術は、フォ
ーカス性能と陰極からの電子放射密度(カソードローデ
ィング)について配慮がされておらず、カソードローデ
ィングを緩和しようとするとフォーカス性能が劣化する
という問題があった。またフォーカス性能を向上させる
ためには、プリフォーカス系のクロスオーバ径を小さく
する必要があり、この結果、G1電極、G2電極の孔径
は小さくなりカソードローディングが増大する。カソー
ドローディングが許容値以上となると酸化物カソード層
(オキサイド)内でジュール熱が発生し、オキサイド層
が剥離して電子放射が不能となる。またしばしばG1電
極の孔周辺に陰極から蒸発したバリウムが付着し、電子
放射(グリッドエミッション)が発生することがある。
グリッドエミッションは、TVセットのカットオフ電圧
を調整するために偏向を切った時に問題となる現象であ
り、G1電極のG2電極側孔周辺の電界が強く、G1電
極から放出された電子がけい光面に到達することによ
る。この現象はG2電極孔径がG1電極孔径と等しい
か、またはそれより大きい時に顕著になる。
In the above-mentioned prior art, the focus performance and the electron emission density from the cathode (cathode loading) are not taken into consideration, and there is a problem that the focus performance deteriorates when trying to alleviate the cathode loading. there were. Further, in order to improve the focusing performance, it is necessary to reduce the crossover diameter of the prefocus system, and as a result, the hole diameters of the G1 electrode and the G2 electrode are reduced and the cathode loading is increased. When the cathode loading exceeds the allowable value, Joule heat is generated in the oxide cathode layer (oxide), and the oxide layer peels off and electron emission becomes impossible. Further, barium evaporated from the cathode often adheres to the periphery of the hole of the G1 electrode, and electron emission (grid emission) may occur.
The grid emission is a phenomenon that becomes a problem when the deflection is turned off to adjust the cutoff voltage of the TV set. The electric field around the G2 electrode side hole of the G1 electrode is strong, and the electrons emitted from the G1 electrode are fluorescent. By reaching the surface. This phenomenon becomes remarkable when the G2 electrode hole diameter is equal to or larger than the G1 electrode hole diameter.

【0006】本発明の目的は、フォーカス特性の向上、
グリッドエミッションの発生の防止及びカソードローデ
ィングの緩和を図ることができる陰極線管を提供するこ
とにある。
An object of the present invention is to improve focus characteristics,
It is an object of the present invention to provide a cathode ray tube capable of preventing generation of grid emission and mitigating cathode loading.

【0007】本発明の他の目的は、上記目的を達成する
ことができる陰極線管の電子銃構体の組立が可能な電子
銃製造方法を提供することにある。
Another object of the present invention is to provide an electron gun manufacturing method capable of assembling an electron gun assembly of a cathode ray tube capable of achieving the above object.

【0008】[0008]

【課題を解決するための手段】上記目的を達成するため
の陰極線管は、制御電極を構成するG1電極の孔径を加
速電極を構成するG2電極の孔径より大きく形成したこ
とを特徴とする。
A cathode ray tube for achieving the above object is characterized in that a hole diameter of a G1 electrode constituting a control electrode is larger than that of a G2 electrode constituting an accelerating electrode.

【0009】上記目的を達成するための電子銃製造方法
は、第1の手段として、制御電極を構成するG1電極の
孔径が加速電極を構成するG2電極の孔径より大きく形
成された電子銃構体の電子銃組立治具であって、電子銃
組立治具のマンドレルは、G1電極とG2電極を組立る
副マンドレルと、G3電極以降を組立る主マンドレルと
からなり、上記副マンドレルと主マンドレルとを同軸上
に配設して電子銃構体を組立ることを特徴とする。
The electron gun manufacturing method for achieving the above object is, as a first means, an electron gun assembly in which the hole diameter of the G1 electrode forming the control electrode is larger than that of the G2 electrode forming the acceleration electrode. In the electron gun assembly jig, the mandrel of the electron gun assembly jig is composed of a sub mandrel for assembling the G1 electrode and the G2 electrode, and a main mandrel for assembling the G3 electrode and later, and the sub mandrel and the main mandrel. It is characterized in that the electron gun assembly is assembled by being arranged coaxially.

【0010】上記目的を達成するための電子銃製造方法
は、第2の手段として、制御電極を構成するG1電極の
孔径が加速電極を構成するG2電極の孔径より大きく形
成された電子銃構体の電子銃組立治具であって、電子銃
組立治具のマンドレルは、G1電極の孔が挿入される部
分とG2電極の孔が挿入される部分とを同径に形成した
G1、G2電極位置決め部を有し、このG1、G2電極
位置決め部の先端部分はG1電極の孔挿入部分とG2電
極の孔挿入部分の途中まで複数に分割されてなり、この
分割部分をピンによって押し広げるように構成してなる
ことを特徴とする。
As a second means, the electron gun manufacturing method for achieving the above object is an electron gun assembly in which the hole diameter of the G1 electrode constituting the control electrode is larger than that of the G2 electrode constituting the acceleration electrode. An electron gun assembly jig, wherein a mandrel of the electron gun assembly jig has a G1 and G2 electrode positioning portion in which a portion into which a hole of a G1 electrode is inserted and a portion into which a hole of a G2 electrode is inserted have the same diameter. The tip of the G1 and G2 electrode positioning part is divided into a plurality of parts up to the middle of the hole insertion part of the G1 electrode and the hole insertion part of the G2 electrode, and the divided part is configured to be spread by a pin. It is characterized by

【0011】[0011]

【作用】まず上記手段のように構成された電子銃構体を
有する陰極線管の作用について述べる。蛍光面における
フォーカス特性は、プリフォーカスレンズ系(陰極、G
1電極乃至G3電極よりなる)で集束したクロスオーバ
径を主レンズ系(最終電極とその前段電極)で蛍光面に
焦点を結んだものである。従って、主レンズ孔径が大き
いほど、またクロスオーバ径が小さいほどフォーカス特
性は良い。クロスオーバ径はG2電極の孔径にほぼ比例
しており、G2電極の孔径を小さくしていくと、これに
比例してフォーカス特性は向上する。グリッドエミッシ
ョンはG1電極の孔周辺、特にG2電極に対向する孔の
エッジを発生源としており、G1電極孔周辺のエッジに
おける電界強度に比例する。G2電極の孔径をG1電極
の孔径より小さくすることにより、G3電極電位のG1
電極孔に対する浸透が緩和され、電界強度が弱くなりグ
リッドエミッションの発生が抑制される。陰極の電子放
射面における電流密度ピーク値(カソードローディン
グ)は、G1電極の孔径の3乗に逆比例し、G2電極の
孔径に対する依存度は小さい。このためG1電極の孔径
をG2電極の孔径より大きくしてカソードローディング
を減少させることができ、この結果、電子放射物質層中
のジュール熱発生が抑制され、電子放射物質の消耗を防
ぐことができる。
First, the operation of the cathode ray tube having the electron gun assembly constructed as described above will be described. The focus characteristics on the phosphor screen are determined by the prefocus lens system (cathode, G
The crossover diameter focused by one electrode to the G3 electrode) is focused on the phosphor screen by the main lens system (final electrode and its predecessor electrode). Therefore, the larger the main lens hole diameter and the smaller the crossover diameter, the better the focusing characteristics. The crossover diameter is almost proportional to the hole diameter of the G2 electrode, and as the hole diameter of the G2 electrode is reduced, the focus characteristic is improved in proportion to this. The grid emission uses the edge of the hole around the G1 electrode, particularly the edge of the hole facing the G2 electrode as a generation source, and is proportional to the electric field intensity at the edge around the hole of the G1 electrode. By making the hole diameter of the G2 electrode smaller than the hole diameter of the G1 electrode,
Penetration into the electrode holes is relaxed, the electric field strength is weakened, and the generation of grid emissions is suppressed. The current density peak value (cathode loading) on the electron emission surface of the cathode is inversely proportional to the cube of the hole diameter of the G1 electrode, and has little dependence on the hole diameter of the G2 electrode. Therefore, the hole diameter of the G1 electrode can be made larger than the hole diameter of the G2 electrode to reduce the cathode loading, and as a result, the generation of Joule heat in the electron emitting material layer can be suppressed and the consumption of the electron emitting material can be prevented. ..

【0012】次に上記電子銃構体を組立る第1の手段に
よる電子銃組立治具の作用について述べる。マンドレル
はG1電極とG2電極を組立る副マンドレルと、G3電
極以降を組立る主マンドレルよりなるので、G1電極の
孔径がG2電極の孔径より大きくても副マンドレルに組
立ることができる。そこで、G1電極とG2電極を組立
た副マンドレルとG3電極以降を組立た主マンドレルと
を同軸上に組み合わせることにより、電子銃構体を組立
ることができる。
Next, the operation of the electron gun assembly jig by the first means for assembling the electron gun assembly will be described. Since the mandrel comprises a sub mandrel for assembling the G1 electrode and the G2 electrode and a main mandrel for assembling the G3 electrode and thereafter, the mandrel can be assembled on the sub mandrel even if the hole diameter of the G1 electrode is larger than that of the G2 electrode. Therefore, an electron gun assembly can be assembled by coaxially combining the sub mandrel in which the G1 electrode and the G2 electrode are assembled and the main mandrel in which the G3 electrode and later are assembled.

【0013】最後に上記電子銃構体を組立る第2の手段
による電子銃組立治具の作用について述べる。マンドレ
ルは1本よりなるが、G1電極とG2電極を組立る部分
は同径で、マンドレルのG1電極部分を押し広げるの
で、G1電極の孔径がG2電極の孔径より大きくても組
立ることができる。
Finally, the operation of the electron gun assembly jig by the second means for assembling the electron gun assembly will be described. Although the mandrel consists of one piece, the part where the G1 electrode and the G2 electrode are assembled has the same diameter, and the G1 electrode part of the mandrel is pushed wide, so it is possible to assemble even if the hole diameter of the G1 electrode is larger than that of the G2 electrode. ..

【0014】[0014]

【実施例】以下、本発明の一実施例を図により説明す
る。図1は本発明を適用したカラーブラウン管を示す。
図中、1はパネル部、2はファンネル部、3はネック
部、4は蛍光面(画面)、5はシャドウマスク、6は磁
気シールド、7は偏向ヨーク、8はピュリティ調整マグ
ネット、9はセンタービームスタティックコンバーゼン
ス調整マグネット、10はサイドビームスタティックコ
ンバーゼンス調整マグネット、11は電子銃、またBc
はセンタービーム、Bsはサイドビームである。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a color cathode ray tube to which the present invention is applied.
In the figure, 1 is a panel part, 2 is a funnel part, 3 is a neck part, 4 is a fluorescent screen (screen), 5 is a shadow mask, 6 is a magnetic shield, 7 is a deflection yoke, 8 is a purity adjusting magnet, and 9 is a center. Beam static convergence adjustment magnet, 10 side beam static convergence adjustment magnet, 11 electron gun, Bc
Is a center beam and Bs is a side beam.

【0015】このようなカラーブラウン管のコンバーゼ
ンス調整(スタティックコンバーゼンス)は、まず2本
のサイドビームBs、Bsのコンバーゼンスを取った
後、センタービームBcと上記サイドビームBsのコン
バーゼンス点とを集中させるようにしている。
In the convergence adjustment (static convergence) of such a color CRT, first, the convergence of the two side beams Bs and Bs is taken, and then the center beam Bc and the convergence point of the side beam Bs are concentrated. ing.

【0016】図2は前記電子銃11の電極構成を示す。
図中、20は陰極、21はG1電極、22はG2電極、
23はG3電極、24はG4電極、25はG5電極、2
6はG6電極である。この電子銃11は複数の主レンズ
を用い、良好なフォーカス特性が得られる。明るく高解
像度の画像を得るためには、陽極電圧Ebの値を高くす
る必要があり、通常Ebは25乃至35KVである。フ
ォーカス電圧Ec3 はEbの30%程度で、G2電極2
2の印加電圧Ec2は400乃至700V程度、G1電
極21は接地され、陰極20には各絵素の明るさに対応
した200V以下の信号の電圧Ekが印加される。な
お、27はG3電位給電線、28はG5電位給電線、2
9はビードガラスを示す。
FIG. 2 shows an electrode structure of the electron gun 11.
In the figure, 20 is a cathode, 21 is a G1 electrode, 22 is a G2 electrode,
23 is a G3 electrode, 24 is a G4 electrode, 25 is a G5 electrode, 2
6 is a G6 electrode. This electron gun 11 uses a plurality of main lenses and can obtain good focus characteristics. In order to obtain a bright and high-resolution image, it is necessary to increase the value of the anode voltage Eb, and usually Eb is 25 to 35 KV. The focus voltage Ec 3 is about 30% of Eb, and the G2 electrode 2
The applied voltage Ec 2 of 2 is about 400 to 700 V, the G1 electrode 21 is grounded, and the cathode 20 is applied with a signal voltage Ek of 200 V or less corresponding to the brightness of each pixel. In addition, 27 is a G3 electric potential feeder, 28 is a G5 electric potential feeder, 2
9 shows a bead glass.

【0017】本実施例においては、前記G1電極21の
孔径(電子ビーム通過孔径)は、G2電極22の孔径よ
り大きく形成されている。1例を示すと、G1電極21
の孔径は0.60mmφ、G2電極22の孔径は0.5
5mmφ、G3電極23の孔径は1.50mmφに形成
されている。次にこのように形成された電子銃11を有
するカラーブラウン管の特性について調査した結果につ
いて述べる。
In this embodiment, the hole diameter of the G1 electrode 21 (electron beam passage hole diameter) is larger than the hole diameter of the G2 electrode 22. As an example, the G1 electrode 21
Has a diameter of 0.60 mm and the G2 electrode 22 has a diameter of 0.5.
The G3 electrode 23 has a hole diameter of 5 mmφ and a hole diameter of 1.50 mmφ. Next, the results of investigating the characteristics of the color CRT having the electron gun 11 thus formed will be described.

【0018】まずフォーカス特性について調査した結果
を述べる。蛍光面4におけるフォーカス特性は、良く知
られているように、プリフォーカスレンズ系(陰極2
0、G1電極21乃至G3電極23よりなる)で集束し
たクロスオーバ径を主レンズ系(最終電極とその前段電
極、本実施例の場合はG5電極25とG6電極26)で
蛍光面4に焦点を結んだものである。従って、主レンズ
孔径が大きいほど、またクロスオーバ径が小さいほどフ
ォーカス特性は良い。図3に示すように、クロスオーバ
径はG2電極22の孔径にほぼ比例しており、電子銃構
造の中でG2電極22の孔径を小さくしていくと、これ
に比例してフォーカス特性は向上する。この傾向は、商
用放送・モノスコパターン等の500μA以下の低電流
域において特に効果がある。例えば、本実施例に示すよ
うに、G1電極21の孔径を0.60mmφ、G2電極
22の孔径を0.55mmφとした場合は、G1電極2
1の孔径とG2電極22の孔径を同じ0.60mmφと
した場合に比較して、シミュレーションではクロスオー
バ径で約5%の改良が見込まれ、また実測では500μ
A以下の低電流領域でけい光面上の電子ビーム径は約5
%小さくなった。
First, the result of an investigation on focus characteristics will be described. As is well known, the focus characteristics on the phosphor screen 4 are prefocus lens systems (cathode 2
0, which is composed of the G1 electrode 21 to the G3 electrode 23) and focuses the crossover diameter on the phosphor screen 4 with the main lens system (the final electrode and the preceding electrode, G5 electrode 25 and G6 electrode 26 in this embodiment). Are tied together. Therefore, the larger the main lens hole diameter and the smaller the crossover diameter, the better the focusing characteristics. As shown in FIG. 3, the crossover diameter is almost proportional to the hole diameter of the G2 electrode 22, and as the hole diameter of the G2 electrode 22 is reduced in the electron gun structure, the focus characteristic is improved in proportion to this. To do. This tendency is particularly effective in the low current region of 500 μA or less such as commercial broadcasting and monoscopic pattern. For example, as shown in this embodiment, when the hole diameter of the G1 electrode 21 is 0.60 mmφ and the hole diameter of the G2 electrode 22 is 0.55 mmφ, the G1 electrode 2
In comparison with the case where the hole diameter of No. 1 and the hole diameter of the G2 electrode 22 are the same 0.60 mmφ, the simulation is expected to improve the crossover diameter by about 5%, and the actual measurement is 500 μ.
In the low current region below A, the electron beam diameter on the fluorescent surface is about 5
It has become smaller.

【0019】次にグリッドエミッションについて調査し
た結果を述べる。グリッドエミッションはG1電極21
の孔周辺、特にG2電極22に対向する孔のエッジを発
生源としており、G1電極21の孔周辺のエッジにおけ
る電界強度に比例する。G1電極21の孔径とG2電極
22の孔径の比及びG1電極21の孔周辺エッジ部の電
界強度の関係は、図4に示すように、G2電極22の孔
径をG1電極21の孔径より小さくすることにより、G
2電極22の電位、G3電極23の電位のG1電極21
孔に対する浸透が緩和され、電界強度が弱くなりグリッ
ドエミッションの発生が抑制される。例えば、本実施例
に示すように、G1電極21の孔径を0.60mmφ、
G2電極22の孔径を0.55mmφとした場合は、G
1電極21の孔径とG2電極22の孔径を同じ0.60
mmφとした場合に比較して、約10%電界が緩和され
る。
Next, the results of a survey on grid emissions will be described. Grid emission is G1 electrode 21
The source of generation is the edge of the hole, particularly the edge of the hole facing the G2 electrode 22, and is proportional to the electric field strength at the edge of the G1 electrode 21 around the hole. As shown in FIG. 4, the ratio of the hole diameter of the G1 electrode 21 to the hole diameter of the G2 electrode 22 and the electric field strength of the edge portion around the hole of the G1 electrode 21 makes the hole diameter of the G2 electrode 22 smaller than the hole diameter of the G1 electrode 21. By this, G
The potential of the two electrodes 22, the G1 electrode 21 of the potential of the G3 electrode 23
Penetration into the holes is mitigated, the electric field strength is weakened, and the generation of grid emissions is suppressed. For example, as shown in this embodiment, the hole diameter of the G1 electrode 21 is 0.60 mmφ,
When the hole diameter of the G2 electrode 22 is set to 0.55 mmφ, G
The hole diameter of 1 electrode 21 and the hole diameter of G2 electrode 22 are the same 0.60
The electric field is relaxed by about 10% as compared with the case of mmφ.

【0020】最後にカソードローディングについて調査
した結果を述べる。陰極20の電子放射面における電流
密度ピーク値(カソードローディング)は、図5に示す
ように、G1電極21の孔径の3乗に逆比例し、G2電
極22の孔径に対する依存度は小さい。このためG1電
極21の孔径をG2電極22の孔径より大きくしてカソ
ードローディングを減少させることができ、この結果、
電子放射物質層中のジュール熱発生が抑制され、電子放
射物質の消耗を防ぐことができる。
Finally, the results of investigation on cathode loading will be described. As shown in FIG. 5, the current density peak value (cathode loading) on the electron emission surface of the cathode 20 is inversely proportional to the cube of the hole diameter of the G1 electrode 21, and the dependence on the hole diameter of the G2 electrode 22 is small. Therefore, the hole diameter of the G1 electrode 21 can be made larger than that of the G2 electrode 22 to reduce the cathode loading. As a result,
Generation of Joule heat in the electron emitting material layer is suppressed, and consumption of the electron emitting material can be prevented.

【0021】図6は前記のようにG1電極21の孔径を
G2電極22の孔径より大きくした電子銃の組立に用い
るマンドレルの主要部の一実施例を示す。電極21乃至
26を位置決めするマンドレルは、G3電極23以降
(本実施例の場合はG3電極23乃至G6電極26)を
位置決めする主マンドレル30と、G1電極21及びG
2電極22を位置決めする副マンドレル31とで構成さ
れている。主マンドレル30の先端には円錐状の凹部3
0aが形成されている。副マンドレル31は、G1電極
21の孔21aに挿入されるG1電極位置決め部31a
とG2電極22の孔22aに挿入されるG2電極位置決
め部31bの2段形状に形成され、G2電極位置決め部
31bの先端は前記主マンドレル30の凹部30aに係
合するように円錐状の凸部31cに形成されている。
FIG. 6 shows an embodiment of a main part of a mandrel used for assembling an electron gun in which the hole diameter of the G1 electrode 21 is larger than that of the G2 electrode 22 as described above. The mandrel for positioning the electrodes 21 to 26 includes a main mandrel 30 for positioning the G3 electrode 23 and thereafter (G3 electrode 23 to G6 electrode 26 in this embodiment), the G1 electrodes 21 and G.
It is configured with a sub mandrel 31 for positioning the two electrodes 22. At the tip of the main mandrel 30, a conical recess 3 is formed.
0a is formed. The sub mandrel 31 is a G1 electrode positioning portion 31a inserted into the hole 21a of the G1 electrode 21.
And a G2 electrode positioning portion 31b inserted into the hole 22a of the G2 electrode 22 is formed in a two-step shape, and the tip of the G2 electrode positioning portion 31b is a conical convex portion so as to engage with the concave portion 30a of the main mandrel 30. 31c.

【0022】そこで、各電極の組立は、主マンドレル3
0にG3電極23乃至G6電極26の孔を挿入し、かつ
電極間にスペーサを介して位置決めする。また副マンド
レル31のG1電極位置決め部31aにG1電極21の
孔21aを挿入し、そしてG2電極位置決め部31bに
G2電極22の孔22aを挿入し、かつG1電極21と
G2電極22間にスペーサを介して位置決めする。そし
て、主マンドレル30の凹部30aに副マンドレル31
の凸部31cを係合させることによりG1電極21乃至
G6電極26は位置決めされる。ここで、主マンドレル
30と副マンドレル31とは、図示しないビーデイング
治具内で高精度に同軸セットされる。このようにして位
置決めした後、ビードガラス29で各電極を固定する。
その後は主マンドレル30と副マンドレル31とを反対
方向、即ち主マンドレル30は下方、副マンドレル31
は上方に抜き取る。
Therefore, the assembly of each electrode is carried out by the main mandrel 3
The holes of the G3 electrode 23 to the G6 electrode 26 are inserted in 0, and the electrodes are positioned via a spacer. Further, the hole 21a of the G1 electrode 21 is inserted into the G1 electrode positioning portion 31a of the sub mandrel 31, the hole 22a of the G2 electrode 22 is inserted into the G2 electrode positioning portion 31b, and a spacer is provided between the G1 electrode 21 and the G2 electrode 22. Position through. Then, the sub mandrel 31 is placed in the recess 30a of the main mandrel 30.
The G1 electrode 21 to the G6 electrode 26 are positioned by engaging the convex portions 31c of. Here, the main mandrel 30 and the sub mandrel 31 are coaxially set with high precision in a beading jig (not shown). After positioning in this way, each electrode is fixed by the bead glass 29.
After that, the main mandrel 30 and the sub mandrel 31 are directed in the opposite directions, that is, the main mandrel 30 is downward and the sub mandrel 31 is
Pull out upwards.

【0023】このように、マンドレルは2部品よりなる
ので、G1電極21の孔径がG2電極22の孔径より大
きくても組立が可能である。
As described above, since the mandrel is composed of two parts, the mandrel can be assembled even if the hole diameter of the G1 electrode 21 is larger than that of the G2 electrode 22.

【0024】図7及び図8はマンドレルの主要部の他の
実施例を示す。本実施例は、1個のマンドレル32より
なり、該マンドレル32の先端部分にはG1電極21及
びG2電極22を位置決めするG1、G2電極位置決め
部32aが形成されている。ここで、G1、G2電極位
置決め部32aはG2電極22の孔22aの孔径に合わ
せて形成されている。またマンドレル32には、孔32
bがG1電極21とG2電極22の中間までの深さで形
成され、G1、G2電極位置決め部32aの孔32bの
部分は、3個の縦溝32cによって3分割されている。
7 and 8 show another embodiment of the main part of the mandrel. In this embodiment, one mandrel 32 is provided, and G1 and G2 electrode positioning portions 32a for positioning the G1 electrode 21 and the G2 electrode 22 are formed at the tip of the mandrel 32. Here, the G1 and G2 electrode positioning portions 32a are formed according to the hole diameter of the hole 22a of the G2 electrode 22. Further, the mandrel 32 has a hole 32.
b is formed to a depth halfway between the G1 electrode 21 and the G2 electrode 22, and the hole 32b of the G1 and G2 electrode positioning portion 32a is divided into three by three vertical grooves 32c.

【0025】そこで、マンドレル32にG6電極26、
G5電極25、G4電極24、G3電極23を挿入し、
かつ電極間にスペーサを介して組立た後、G1、G2電
極位置決め部32aにG2電極22、G1電極21を挿
入し、G2電極22とG1電極21間にスペーサを介し
て組立る。これにより、G2電極22乃至G6電極26
はマンドレル32によって位置決めされる。次に先端が
円錐状をした針状のピン33を孔32bに挿入して押圧
すると、G1、G2電極位置決め部32aの3つ割れ部
分は押し広げられ、この押し広げられた部分がG1電極
21の孔21aに係合し、G1電極21は電子銃の軸に
合わせられる。
Therefore, the mandrel 32 has a G6 electrode 26,
Insert the G5 electrode 25, G4 electrode 24, G3 electrode 23,
In addition, after assembling the electrodes via the spacer, the G2 electrode 22 and the G1 electrode 21 are inserted into the G1 and G2 electrode positioning portions 32a, and the G2 electrode 22 and the G1 electrode 21 are assembled via the spacer. As a result, the G2 electrode 22 to the G6 electrode 26
Is positioned by the mandrel 32. Next, when a needle-shaped pin 33 having a conical tip is inserted into the hole 32b and pressed, the three cracked portions of the G1 and G2 electrode positioning portions 32a are spread, and the spread portion is the G1 electrode 21. Engaged with the hole 21a of the electron gun, and the G1 electrode 21 is aligned with the axis of the electron gun.

【0026】このように、マンドレル32のG1、G2
電極位置決め部32a部分を広げるので、G1電極21
の孔径がG2電極22の孔径より大きくても組立が可能
である。なお、この方法は、マンドレル32の先端を強
制的に広げるので、G1電極21の孔径がG2電極22
の孔径よりあまり大きなものには適用できなく、約10
%以下の大きさのものに限定される。
In this way, G1 and G2 of the mandrel 32 are
Since the electrode positioning portion 32a is widened, the G1 electrode 21
Even if the hole diameter of is larger than the hole diameter of the G2 electrode 22, the assembly is possible. In this method, the tip of the mandrel 32 is forcibly widened, so that the hole diameter of the G1 electrode 21 is smaller than that of the G2 electrode 22.
It is not applicable to the ones that are much larger than the
The size is limited to less than%.

【0027】[0027]

【発明の効果】本発明になる陰極線管によれば、G1電
極の孔径をG2電極の孔径より大きく形成してなるの
で、フォーカス特性が向上し、またグリッドエミッショ
ンの発生が防止され、更にカソードローディングが緩和
する。
According to the cathode ray tube of the present invention, the hole diameter of the G1 electrode is made larger than the hole diameter of the G2 electrode, so that the focusing characteristics are improved, the grid emission is prevented, and the cathode loading is further improved. Alleviates.

【0028】また本発明になる第1の手段による電子銃
製造方法は、制御電極を構成するG1電極の孔径が加速
電極を構成するG2電極の孔径より大きく形成された電
子銃構体の電子銃組立治具であって、電子銃組立治具の
マンドレルは、G1電極とG2電極を組立る副マンドレ
ルと、G3電極以降を組立る主マンドレルとからなり、
上記副マンドレルと主マンドレルとを同軸上に配設して
電子銃構体を組立る構成よりなり、また第2の手段によ
る電子銃製造方法は、制御電極を構成するG1電極の孔
径が加速電極を構成するG2電極の孔径より大きく形成
された電子銃構体の電子銃組立治具であって、電子銃組
立治具のマンドレルは、G1電極の孔が挿入される部分
とG2電極の孔が挿入される部分とを同径に形成したG
1、G2電極位置決め部を有し、このG1、G2電極位
置決め部の先端部分はG1電極の孔挿入部分とG2電極
の孔挿入部分の途中まで複数に分割されてなり、この分
割部分をピンによって押し広げるように構成してなるの
で、G1電極の孔径がG2電極の孔径より大きくても組
立が可能である。
Further, in the electron gun manufacturing method according to the first means of the present invention, the electron gun assembly of the electron gun assembly is formed in which the hole diameter of the G1 electrode forming the control electrode is larger than the hole diameter of the G2 electrode forming the acceleration electrode. The jig, which is a mandrel of the electron gun assembly jig, includes a sub mandrel for assembling the G1 electrode and the G2 electrode, and a main mandrel for assembling the G3 electrode and thereafter.
The electron gun assembly is constructed by disposing the sub mandrel and the main mandrel coaxially, and the electron gun manufacturing method by the second means is such that the hole diameter of the G1 electrode forming the control electrode is the acceleration electrode. An electron gun assembly jig of an electron gun assembly formed to have a diameter larger than that of a G2 electrode constituting the mandrel. The mandrel of the electron gun assembly jig has a portion into which the hole of the G1 electrode and a hole of the G2 electrode are inserted. G with the same diameter as the
1. G1 and G2 electrode positioning parts are provided, and the tips of the G1 and G2 electrode positioning parts are divided into a plurality of parts up to the middle of the hole insertion part of the G1 electrode and the hole insertion part of the G2 electrode. Since the configuration is such that the G1 electrode is wider than the G2 electrode, assembly is possible even if the G1 electrode has a larger hole diameter than the G2 electrode.

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

【図1】本発明を適用した陰極線管の一実施例を示す断
面図である。
FIG. 1 is a sectional view showing an embodiment of a cathode ray tube to which the present invention is applied.

【図2】図1の電子銃を示し、(a)は正面図、(b)
は側面図、(c)は背面図、(d)は平面図である。
2 shows the electron gun of FIG. 1, (a) is a front view, (b)
Is a side view, (c) is a rear view, and (d) is a plan view.

【図3】図2に示す電子銃のフォーカス特性図である。FIG. 3 is a focus characteristic diagram of the electron gun shown in FIG.

【図4】図2に示す電子銃のグリッドエミッション特性
図である。
FIG. 4 is a grid emission characteristic diagram of the electron gun shown in FIG.

【図5】図2に示す電子銃のカソードローディング特性
図である。
5 is a cathode loading characteristic diagram of the electron gun shown in FIG.

【図6】本発明になる電子銃組立治具の一実施例を示す
G1電極乃至G3電極とマンドレルとの嵌合部の要部断
面図である。
FIG. 6 is a cross-sectional view of essential parts of a fitting portion between a G1 electrode to a G3 electrode and a mandrel, showing an embodiment of an electron gun assembly jig according to the present invention.

【図7】本発明になる電子銃組立治具の他の実施例を示
すG1電極乃至G3電極とマンドレルとの嵌合部の要部
断面図である。
FIG. 7 is a cross-sectional view of essential parts of a fitting portion between a G1 electrode to a G3 electrode and a mandrel showing another embodiment of the electron gun assembly jig according to the present invention.

【図8】図7のマンドレルを示し、(a)は正面図、
(b)は平面図である。
FIG. 8 shows the mandrel of FIG. 7, (a) being a front view,
(B) is a plan view.

【符号の説明】[Explanation of symbols]

1 パネル部 2 ファンネル部 3 ネック部 4 蛍光面 11 電子銃 21 G1電極 21a G1電極の孔 22 G2電極 22a G2電極の孔 23 G3電極 30 主マンドレル 30a 凹部 31 副マンドレル 31c 凸部 32 マンドレル 32a G1、G2電極位置決め部 32b 孔 32c 縦溝 33 ピン 1 Panel Part 2 Funnel Part 3 Neck Part 4 Fluorescent Surface 11 Electron Gun 21 G1 Electrode 21a G1 Electrode Hole 22 G2 Electrode 22a G2 Electrode Hole 23 G3 Electrode 30 Main Mandrel 30a Recess 31 Sub-Mandrel 31c Convex Part 32 Mandrel 32a G1, G2 electrode positioning part 32b hole 32c vertical groove 33 pin

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 パネル部及びネック部とこれらの相互間
を連結しているファンネル部とからなる外囲器を含み、
上記パネル部の内表面にスクリーンが形成され、上記ネ
ック部に電子ビームを発生させて上記スクリーンに向け
て発射するための陰極、制御電極、加速電極、集束電極
が少なくとも配設された電子銃が収納されるように構成
されている陰極線管において、上記制御電極の孔径を加
速電極の孔径より大きく形成したことを特徴とする陰極
線管。
1. An envelope including a panel portion, a neck portion, and a funnel portion connecting these to each other,
A screen is formed on the inner surface of the panel section, and an electron gun is provided in which at least a cathode for generating an electron beam at the neck section and emitting the electron beam toward the screen, a control electrode, an acceleration electrode, and a focusing electrode are arranged. In a cathode ray tube configured to be housed, a hole diameter of the control electrode is formed larger than a hole diameter of the acceleration electrode.
【請求項2】 陰極、制御電極、加速電極、集束電極を
少なくとも備え、上記制御電極の孔径が加速電極の孔径
より大きく形成された電子銃の製造方法であって、電子
銃組立治具のマンドレルは、制御電極と加速電極を組立
る副マンドレルと、集束電極以降を組立る主マンドレル
とからなり、上記副マンドレルと主マンドレルとを同軸
上に配設して電子銃構体を組立ることを特徴とする電子
銃製造方法。
2. A method of manufacturing an electron gun, comprising at least a cathode, a control electrode, an acceleration electrode, and a focusing electrode, wherein the hole diameter of the control electrode is larger than the hole diameter of the acceleration electrode. Is composed of a sub mandrel for assembling the control electrode and the accelerating electrode, and a main mandrel for assembling the focusing electrode and thereafter, and the sub mandrel and the main mandrel are coaxially arranged to assemble the electron gun assembly. Electron gun manufacturing method.
【請求項3】 制御電極の孔径が加速電極の孔径より大
きく形成された電子銃の製造方法であって、電子銃組立
治具のマンドレルは、制御電極の孔が挿入される部分と
加速電極の孔が挿入される部分とを同径に形成した制
御、加速電極位置決め部を有し、この制御、加速電極位
置決め部の先端部分は制御電極の孔挿入部分と加速電極
の孔挿入部分の途中まで複数に分割されてなり、この分
割部分をピンによって押し広げるように構成して電子銃
構体を組立ることを特徴とする電子銃製造方法。
3. A method of manufacturing an electron gun in which a hole diameter of a control electrode is formed larger than a hole diameter of an accelerating electrode, wherein a mandrel of an electron gun assembling jig has a portion where the hole of the control electrode is inserted and an accelerating electrode. It has a control and acceleration electrode positioning part that has the same diameter as the hole insertion part, and the tip part of this control and acceleration electrode positioning part is halfway between the control electrode hole insertion part and the acceleration electrode hole insertion part. An electron gun manufacturing method, characterized in that the electron gun assembly is assembled into a plurality of parts, and the divided parts are spread by a pin.
JP21503191A 1991-08-27 1991-08-27 Cathode-ray tube and manufacture of electron gun Pending JPH0554822A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP21503191A JPH0554822A (en) 1991-08-27 1991-08-27 Cathode-ray tube and manufacture of electron gun

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP21503191A JPH0554822A (en) 1991-08-27 1991-08-27 Cathode-ray tube and manufacture of electron gun

Publications (1)

Publication Number Publication Date
JPH0554822A true JPH0554822A (en) 1993-03-05

Family

ID=16665607

Family Applications (1)

Application Number Title Priority Date Filing Date
JP21503191A Pending JPH0554822A (en) 1991-08-27 1991-08-27 Cathode-ray tube and manufacture of electron gun

Country Status (1)

Country Link
JP (1) JPH0554822A (en)

Similar Documents

Publication Publication Date Title
JPH0831337A (en) Electron gun for color cathode-ray tube
US5864203A (en) Dynamic focusing electron gun
US6288482B1 (en) Color cathode ray tube with reduced drive voltage
JPH0714526A (en) Electron gun for color cathode-ray tube
JP2737616B2 (en) Field emission cathodes for cathode ray tubes and cathode ray tubes
JPH08148095A (en) Electron gun and color cathode-ray tube provided with this electron gun
JPH0554822A (en) Cathode-ray tube and manufacture of electron gun
KR970006037B1 (en) Cathode ray tube with improved electron gun
CN1261965C (en) Electron gun for cathod-ray tube
JP3672390B2 (en) Electron gun for color cathode ray tube
US5898260A (en) Color cathode ray tube having improved resolution
KR20010035823A (en) electron gun for the cathode ray tube
GB2309332A (en) An electron gun for a color cathode ray tube
KR100258904B1 (en) Electron gun for color cathode ray tube
KR100228161B1 (en) Electron gun for color cathode ray tube
US6744190B2 (en) Cathode ray tube with modified in-line electron gun
JP2878731B2 (en) Color picture tube equipment
KR100236105B1 (en) Electron gun for color crt
EP0725973B1 (en) Cathode ray tube provided with an electron gun, and electrostatic lens system
KR100215816B1 (en) Color crt
JP2960498B2 (en) Color picture tube equipment
KR200154147Y1 (en) An electron gun for color crt
KR940008759B1 (en) Electron gun for c-crt
KR20040076117A (en) Electron gun for Color Cathode Ray Tube
KR940008761B1 (en) Electron gun for c-crt