JPH01137540A - Electron gun for color picture tube - Google Patents

Abstract

PURPOSE:To concurrently realize the dynamic astigmatism correction and dynamic focus by electrically connecting and arranging plate-shaped electrodes extended to the inside of the second member to the first member. CONSTITUTION:Only a single large opening section is provided on the first member 111 of an electrode G3 at the opposite face to the second member 112, and only plate-shaped correcting electrodes 113 arranged at the top and bottom of an electron beam passing hole on the opposite face to the first member 111 on the second member 112 and extended into the first member 111 through the opening section are used for the structure to form a quadruple- electrode lens. No electrode portion belonging to the first member 111 arranged near the electron beam exists near the mating faces of the first and the second members. The correction of astigmatism caused by the electron beam deflection and the dynamic focus are concurrently realized, the resolution at the periphery of a screen is improved, no precision is required, and the increase of the production cost can be prevented.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、カラー受像管用電子銃の主レンズを構成する
電極形状に関するものである・〔従来の技術〕 第２図は、従来構造の電子銃を備えたカラー受像管の縦
断面図である。ガラス外囲器１のフェースプレート部２
の内壁に、３色の蛍光体を交互にストライプ状に塗布し
た蛍光面３が支持されている。陰極６，７．８の中心軸
１５，１６．１７はＧ１電極９．Ｇ２電極１０．主レン
ズを構成する集束電極１１、および遮蔽カップ１３の、
それぞれの陰極に対応する開孔部の中心軸と一致し、共
通平面上に、互いにほぼ平行に配置されている。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to the shape of an electrode constituting the main lens of an electron gun for a color picture tube. 1 is a longitudinal cross-sectional view of a color picture tube equipped with a gun; FIG. Face plate portion 2 of glass envelope 1
A phosphor screen 3 on which phosphors of three colors are alternately coated in stripes is supported on the inner wall of the screen. The central axis 15, 16.17 of the cathode 6, 7.8 is the G1 electrode 9. G2 electrode 10. The focusing electrode 11 and the shielding cup 13 constituting the main lens,
They coincide with the central axes of the openings corresponding to the respective cathodes, and are arranged substantially parallel to each other on a common plane.

主レンズを構成するもう一方の電極である加速電極１２
の中央の開孔部の中心軸は、上記中心軸１６と一致して
いるが、外側の両開孔の中心軸１８．１９はそれぞれに
対応する中心軸１５゜１７と一致せず外側にわずかに変
位している。各陰極から射出される３本の電子ビームは
、中心軸１５．１６．１７に沿って主レンズに入射する
。Accelerating electrode 12 which is the other electrode forming the main lens
The central axis of the central aperture coincides with the central axis 16, but the central axes 18 and 19 of the two outer apertures do not coincide with their corresponding central axes 15°17 and are slightly outward. It is displaced to . The three electron beams emitted from each cathode are incident on the main lens along the central axis 15, 16, 17.

集束電極１１には、５〜ｌ０ＫＶ程度の集束電圧が印加
され、加速電極１２は、２０〜３０ＫＶ程度の加速電圧
が印加され、遮蔽カップ１３．ガラス外囲器内部に設け
られた導電膜５と同電位になっている。A focusing voltage of about 5 to 10 KV is applied to the focusing electrode 11, an accelerating voltage of about 20 to 30 KV is applied to the accelerating electrode 12, and the shielding cup 13. It has the same potential as the conductive film 5 provided inside the glass envelope.

集束、加速周電極の中央部の開孔は同軸になっているの
で、中央に形成される主レンズは軸対称となり、中央ビ
ームは主レンズによって集束された後、軸に沿った軌道
を直進する。−万両電極の外側の開孔は、互いに軸がず
れているので、外側には非軸対称の主レンズが形成され
る。このため、外側ビームは、主レンズ領域のうち、加
速電極側に形成される発散レンズ領域で、レンズ中心軸
から中央ビーム方向に外れた部分を通過し、主レンズに
よる集束作用と同時に、中央ビーム方向への集束力をう
ける。こうして、３本の電子ビームは。The apertures in the center of the focusing and accelerating circumferential electrodes are coaxial, so the main lens formed in the center is axially symmetrical, and after being focused by the main lens, the central beam travels straight along a trajectory along the axis. . - Since the axes of the apertures on the outside of the two electrodes are offset from each other, a non-axisymmetric main lens is formed on the outside. Therefore, the outer beam passes through a part of the main lens area that is deviated from the lens center axis in the direction of the center beam in the diverging lens area formed on the accelerating electrode side, and at the same time as the main lens focuses, the outer beam Receives a focusing force in a direction. In this way, the three electron beams.

シャドウマスク４上で、結像すると同時に、互いに重な
り合うように集中する。この様に、各ビームを集中させ
る操作を、静コンバーゼンス（以後ｓ　’ｒ　ｃと略す
）と呼ぶ。さらに各電子ビームは、シャドウマスクによ
り色選別をうけ、各ビームに対応する色の蛍光体を励起
発光させる成分だけが、シャドウマスクの開孔を通過し
、蛍光面に到る。When the images are formed on the shadow mask 4, they are focused so that they overlap each other. The operation of concentrating each beam in this manner is called static convergence (hereinafter abbreviated as s'rc). Furthermore, each electron beam is color-selected by a shadow mask, and only the component that excites the phosphor of the color corresponding to each beam to emit light passes through the aperture of the shadow mask and reaches the phosphor screen.

また、電子ビームを蛍光面上で走査するため、外部磁気
偏向ヨーク１４が設けられている。Further, an external magnetic deflection yoke 14 is provided to scan the electron beam on the fluorescent screen.

上記のように３本の電子ビーム通路が一水平面上に配置
されるインライン電子銃と、特殊な非斉一磁界分布を形
成するいわゆるセルフコンバーゼンス偏向ヨークを組合
わせることにより、画面中央でＳＴＣがとれていれば、
他の画面全域にわたってコンバーゼンスをとれるという
ことが知られている。しかし、一般にセルフコンバーゼ
ンス偏向ヨークでは、磁界の非斉一性のため偏向収差が
大きく、画面周辺部で解像度が低下するという問題があ
る。第３図は電子ビームスポットが偏向収差により変形
される様子を模式的に示したものである。すなわち、画
面周辺部では斜線で示した電子ビームの高輝度部分（コ
ア）が水平方向に拡がり、低輝度部分（ハロ）が垂直方
向に拡がっている。As mentioned above, by combining the in-line electron gun with three electron beam paths arranged on one horizontal plane and the so-called self-convergence deflection yoke that forms a special non-uniform magnetic field distribution, the STC can be removed at the center of the screen. If so,
It is known that convergence can be achieved across the entire screen. However, in general, a self-convergence deflection yoke has a problem in that the deflection aberration is large due to the non-uniformity of the magnetic field, and the resolution is degraded at the periphery of the screen. FIG. 3 schematically shows how the electron beam spot is deformed by deflection aberration. That is, in the peripheral area of the screen, a high-brightness portion (core) of the electron beam indicated by diagonal lines spreads in the horizontal direction, and a low-brightness portion (halo) spreads in the vertical direction.

特開昭６１−．９９２４９に、この問題を解決するため
の一手段が示されている。第４図に、本従来例による電
子銃の構造の一例を示す。集束電極を陰極から蛍光面に
向って第１部材１１４．第２部材１１５、に２分割する
。第１部材１１４の、第２部材１１５に対向する端面に
は、第４図（ｂ）に示すように縦方向に長いスリットが
設けられている。第２部材１１５の第１部材に対向する
端面には、第４図（ｃ）に示すように水平方向に長いス
リット状の開孔が設けられ、偏向ヨークに供給される偏
向電流に同期してダイナミックに変動する電圧、すなわ
ちダイナミック電圧が集束電圧Ｖ。Unexamined Japanese Patent Publication 1986-. No. 99249 shows one way to solve this problem. FIG. 4 shows an example of the structure of an electron gun according to this conventional example. The focusing electrode is connected to the first member 114. from the cathode toward the phosphor screen. The second member 115 is divided into two parts. A long slit in the vertical direction is provided on the end surface of the first member 114 facing the second member 115, as shown in FIG. 4(b). As shown in FIG. 4(c), the end face of the second member 115 facing the first member is provided with a horizontally long slit-shaped opening, which is arranged in synchronization with the deflection current supplied to the deflection yoke. The dynamically changing voltage, that is, the dynamic voltage, is the focusing voltage V.

に重畳されて与えられる。偏向量が大きいときには、第
１部材１１４と第２部材１１５の電位差が大きくなるの
で、スリットにより形成される４重接レンズ強度が強く
なり電子ビームスポットには大きな非点収差が生じる。It is superimposed on and given. When the amount of deflection is large, the potential difference between the first member 114 and the second member 115 becomes large, so the strength of the quadruple tangent lens formed by the slit becomes strong, and a large astigmatism occurs in the electron beam spot.

第２部材１］５の電位が第１．第３部材の電位より高け
れば、電子ビームに生じる非点収差はコアを垂直方向に
長く、ハロを水平方向に長く引き伸ばす効果をもつので
、第３図に示した電子ビーム偏向にともなう非点収差を
うち消すことができ、画面周辺部解像度を向上させるこ
とができる。一方、電子ビームが偏向されないときは第
１部材と第２部材との電位差を無くすことにより、非対
称レンズを形成しないようにして、画面中央部で非点収
差が生じない条件にできるので、解像度劣化は生じない
。The potential of the second member 1]5 is the first. If the potential is higher than that of the third member, the astigmatism that occurs in the electron beam has the effect of elongating the core in the vertical direction and the halo in the horizontal direction. can be canceled out, and the resolution of the peripheral areas of the screen can be improved. On the other hand, when the electron beam is not deflected, by eliminating the potential difference between the first member and the second member, an asymmetric lens is not formed and astigmatism does not occur in the center of the screen, so the resolution deteriorates. does not occur.

また、カラー受像管には、主レンズから画面周辺部まで
の距離が、画面中央部までの距離に比較して遠いので、
中央部と周辺部で電子ビーム集束の条件が異なり、中央
部で電子ビームを集束させると、周辺部では集束せず解
像度が悪化するという問題点がある。しかし、第４図の
従来例では、電子ビームを画面周辺に偏向するとき第２
部材１１４の電位を増大させるので、加速電極１２の加
速電圧との電圧差が縮小し、主レンズのレンズ強度が弱
まる。このため、電子ビーム集束点は画面方向に延長さ
れ、画面周辺部でも電子ビームを画面上に集束させるこ
とができるので、この点でも周辺部解像度劣化を防ぐこ
とができる。すなわちダイナミックな非点収差補正と、
ダイナミックフォーカスとを同時に実現することができ
るつ第５図は、特開昭６１−２５０９３４に示された他
の実施例である。第４図の実施例と同様、集束電極を１
１６．１１７の２つの部材に分割する。第５図（ｂ）、
（ｃ）に示したように、各部材の対向面には縦方向およ
び横方向の板状補正電極を互いに組み合わせるように配
置し、４電極レンズを形成する。第２部材１１７には、
集束電圧Ｖ、に重畳したダイナミック電圧ｖｄを印加し
て、ダイナミックな非点収差補正とダイナミックフォー
カスを同時に実現する。Also, in color picture tubes, the distance from the main lens to the periphery of the screen is longer than the distance to the center of the screen, so
The electron beam focusing conditions are different between the center and the periphery, and if the electron beam is focused at the center, it will not be focused at the periphery, resulting in poor resolution. However, in the conventional example shown in Fig. 4, when deflecting the electron beam to the periphery of the screen, the second
Since the potential of the member 114 is increased, the voltage difference with the accelerating voltage of the accelerating electrode 12 is reduced, and the lens strength of the main lens is weakened. Therefore, the electron beam focusing point is extended in the direction of the screen, and the electron beam can be focused on the screen even at the periphery of the screen, so that resolution deterioration in the periphery can also be prevented in this respect. In other words, dynamic astigmatism correction,
FIG. 5 shows another embodiment disclosed in Japanese Patent Application Laid-Open No. 61-250934, in which dynamic focusing can be realized at the same time. As in the embodiment shown in FIG.
16. Divide into two parts of 117. Figure 5(b),
As shown in (c), vertical and horizontal plate-shaped correction electrodes are arranged on opposing surfaces of each member so as to be combined with each other to form a four-electrode lens. The second member 117 includes
By applying a dynamic voltage Vd superimposed on the focusing voltage V, dynamic astigmatism correction and dynamic focusing are simultaneously realized.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

上記従来技術には、電子銃部品製作および電子銃組立に
極めて高い精度が要求されるという問題点があった。す
なわち、第４図および第５図の従来例では、縦横のスリ
ット、あるいは縦横の板状補正電極を組合わせる際に、
互いにわずかでも所望の位置からずれると、非点収差補
正の際に電子ビームに不均一な力が働き１画面上のスポ
ットを歪ませる。The above-mentioned conventional technology has a problem in that extremely high precision is required for manufacturing electron gun parts and assembling the electron gun. That is, in the conventional examples shown in FIGS. 4 and 5, when combining vertical and horizontal slits or vertical and horizontal plate-like correction electrodes,
If they deviate even slightly from their desired positions, an uneven force acts on the electron beam during astigmatism correction, distorting the spot on one screen.

本発明の目的は、ダイナミックな非点収差補正とダイナ
ミックフォーカスを同時に実現でき１部品層作および組
立に、従来はどの精度を要求されない電子銃構造を与え
ることにある。An object of the present invention is to provide an electron gun structure that can simultaneously realize dynamic astigmatism correction and dynamic focus and does not require any precision in the conventional one-component layer fabrication and assembly.

〔問題点を解決するための手段〕[Means for solving problems]

従来技術では、２種類の異なった構造の電極を正確に組
み合わせる必要から９部品および組立精度を高くしなけ
ればならなかった。そこで、Ｇ３電極第１部材には、第
２部材との対向面に単一の大きな開口部を設けるだけと
し、４電極レンズを形成するための構造としては、第２
部材の第１部材との対向面の電子ビーム通過孔上下に配
置され。In the prior art, it was necessary to accurately combine two types of electrodes with different structures, which required nine parts and high assembly accuracy. Therefore, the first member of the G3 electrode is only provided with a single large opening on the surface facing the second member, and the structure for forming the four-electrode lens is as follows:
Disposed above and below the electron beam passage hole on the surface of the member facing the first member.

上記開口部を通じて第１部材内部に延長された板状補正
電極のみとする。Only the plate-shaped correction electrode extends into the first member through the opening.

〔作用〕[Effect]

上記のような本発明による電極構造では、第１゜第２部
材対向面付近で、電子ビームに近接して配置される、第
１部材に属する電極部分は存在しない。したがって、第
１．第２部材を組み合わせる際に互いの位置関係に関し
ては、高い精度は要求されない。In the electrode structure according to the present invention as described above, there is no electrode portion belonging to the first member that is disposed near the electron beam in the vicinity of the first and second member facing surfaces. Therefore, the first. When assembling the second members, high precision is not required regarding their mutual positional relationship.

〔実施例〕〔Example〕

第１図に本発明の一実施例を示す。集束電極を第１部材
１１１と第２部材１１２とに分割し、第１部材には単一
の横長開口部を設ける。第２部材１１２には、第１部材
との対向端面に３個の円形の電子ビーム通過孔を設け１
通過孔の上下に、第１部材方向に延長された平板状補正
電極１１３を接続する。FIG. 1 shows an embodiment of the present invention. The focusing electrode is divided into a first member 111 and a second member 112, and the first member is provided with a single horizontally elongated opening. The second member 112 is provided with three circular electron beam passage holes on the end face opposite to the first member.
A flat correction electrode 113 extending in the direction of the first member is connected above and below the passage hole.

第１部材１１１には一定の集束電圧ｖ１を、第２部材１
１２にはＶｉ　に重畳してダイナミック電圧ｖｄを印加
する。電子ビームが偏向されるとき、偏向量の増大に伴
なってＶａ　を上昇させるａＶ＋＋の上昇とともに、第
１部材１１１と第２部材１１２の対向部に形成される４
重接レンズ強度が増大し、電子ビーム偏向による非点収
差を補正できる。同時に加速電極１２の加速電圧Ｅｂと
、第２部材１１２への印加電圧との間の電圧差の縮小に
より、主レンズ強度が低下し、主レンズと電子ビーム集
束点との間の距離が長くなるので、画面周辺部でも電子
ビームを集束させることができる。A constant focusing voltage v1 is applied to the first member 111, and a constant focusing voltage v1 is applied to the first member 111.
12, a dynamic voltage vd is applied superimposed on Vi. When the electron beam is deflected, as the amount of deflection increases, aV++ increases which increases Va, and the
The strength of the superimposed lens increases, and astigmatism caused by electron beam deflection can be corrected. At the same time, due to the reduction in the voltage difference between the accelerating voltage Eb of the accelerating electrode 12 and the voltage applied to the second member 112, the main lens strength decreases, and the distance between the main lens and the electron beam focusing point increases. Therefore, the electron beam can be focused even at the periphery of the screen.

すなわち、ダイナミックな非点収差補正とダイナミック
フォーカスとを同時に行える。That is, dynamic astigmatism correction and dynamic focusing can be performed simultaneously.

第１図の電極構造では、第１部材１１１は、４電極レン
ズ部、すなわち第２部材１１２との対向部分の付近では
電子ビーム通路に近接していない。In the electrode structure shown in FIG. 1, the first member 111 is not close to the electron beam path near the four-electrode lens portion, that is, the portion facing the second member 112.

したがって、第１部材位置が第２部材に対する所望の位
置が多少ずれていても４主極レンズ特性に大きく影響す
ることは無いので電極組立には高精度を要求されない。Therefore, even if the desired position of the first member relative to the second member deviates to some extent, it does not greatly affect the characteristics of the four-principal-pole lens, so high precision is not required for electrode assembly.

第６図に、第１図の実施例について、非点収差補正とダ
イナミックフォーカスの特性を解析により求めた結果を
示す。解析の条件は以下の通りである。FIG. 6 shows the results of analysis of astigmatism correction and dynamic focus characteristics for the embodiment shown in FIG. 1. The conditions for the analysis are as follows.

加速電圧　　Ｅｂ：２５ＫＶ 集束電圧　　Ｖｔ：　　６ＫＶ 主レンズ−画面中央部距離：３４０ｍｍ平板状補正電極
１１３の第１部材１１１方向延長量Ｑ　　　：　２．０
，３．０ｍｍ 非点収差補正特性は、非点収差電圧ΔＶ、の値で表わし
、第６図に実線で示した。ΔＶ！は受像管の画面中央で
電子ビームスポットの垂直方向ハロをちょうど消すこと
のできる集束電圧の値から、水平方向のハロを消すこと
のできる集束電圧の値を差し引いたものである。ダイナ
ミック電圧ｖｄが０であると、４主極レンズは形成され
ず、画面中央で非点収差は発生しないのでΔＶ□はＯと
なる。Ｖｄの上昇とともに４主極レンズ強度が増大し非
点収差が強くなる。Δｖｉが正の値であると、電子ビー
ムのコアが縦方向に引き伸ばされるような非点収差が発
生するので、第３図に示した、偏向による非点収差と互
いに打ち消し合う。ダイナミック電圧をＩＫＶ印加する
と、Ｑが３．０＋ｎｍのときは、ΔＶ□の値が約−３Ｋ
Ｖの非点収差を。Acceleration voltage Eb: 25KV Focusing voltage Vt: 6KV Main lens-screen center distance: 340mm Extension amount Q of flat correction electrode 113 in first member 111 direction: 2.0
, 3.0 mm The astigmatism correction characteristic is expressed by the value of the astigmatism voltage ΔV, and is shown by a solid line in FIG. ΔV! is the value of the focusing voltage that can exactly erase the vertical halo of the electron beam spot at the center of the picture tube screen minus the value of the focusing voltage that can erase the horizontal halo. When the dynamic voltage vd is 0, no four principal pole lenses are formed and no astigmatism occurs at the center of the screen, so ΔV□ becomes O. As Vd increases, the strength of the four principal pole lenses increases and astigmatism becomes stronger. When Δvi is a positive value, astigmatism occurs in which the core of the electron beam is stretched in the vertical direction, so that it cancels out the astigmatism caused by deflection shown in FIG. 3. When a dynamic voltage of IKV is applied, the value of ΔV□ is approximately -3K when Q is 3.0+nm.
V astigmatism.

Ｑが２．０ｍｍ（７）ときはＡＶｚが−１，９ＫＶ　（
７）非点収差を補正することができる。When Q is 2.0mm (7), AVz is -1.9KV (
7) Astigmatism can be corrected.

ダイナミックフォーカス特性は、第６図に破線で示した
ダイナミックフォーカス電圧ｖｄ、の値で表わす。ダイ
ナミック電圧ｖｄにほぼ比例して、Ｖｄｔが増大してい
るので、非点収差補正と同時にダイナミックフォーカス
を行えることが分る。The dynamic focus characteristic is expressed by the value of the dynamic focus voltage vd shown by the broken line in FIG. It can be seen that since Vdt increases almost in proportion to the dynamic voltage vd, dynamic focusing can be performed simultaneously with astigmatism correction.

第７図と第８図に本発明の他の実施例を示す。Other embodiments of the invention are shown in FIGS. 7 and 8.

第１図の実施例に対する問題点として外側の電子ビーム
の中央ビーム側部分と、その反対側の電極側壁側部分に
対し４主極レンズが異なった効果を与えるので、画面上
の電子ビームスポットに歪が生じ、さらにコンバーゼン
スにも悪影響を与えるという点があげられる。これは外
側電子ビームの電極側壁側部分では、第１部材１１１の
側壁の影響を強くうけ、一方、中央ビーム側部分では影
響が弱いことに起因する。A problem with the embodiment shown in FIG. 1 is that the four main pole lenses have different effects on the center beam side part of the outer electron beam and the electrode side wall side part on the opposite side, so the electron beam spot on the screen is Distortion occurs and convergence is also adversely affected. This is because the electrode side wall side portion of the outer electron beam is strongly influenced by the side wall of the first member 111, while the center beam side portion is weakly influenced.

そこで、上記の問題点を解決するためには、補正な極１
１３の形状を変更し、第１部材１１１の側壁の影響をシ
ールドするようにすればよい。第７図の実施例では、補
正電極１１３′の両端を折り曲げ、第１部材１１１側壁
部の影響を緩和している。第８図の実施例は、補正電極
１１３′の電子ビーム通過孔上下に配置された部分を接
続して一体型の部品とし、同図（ａ）に示すように接続
部を凹型に湾曲させる。第７図実施例と同様、第１部材
１１１側壁の影響が緩和されている。Therefore, in order to solve the above problem, a corrective pole 1
13 may be changed to shield the influence of the side wall of the first member 111. In the embodiment shown in FIG. 7, both ends of the correction electrode 113' are bent to reduce the influence of the side wall portion of the first member 111. In the embodiment shown in FIG. 8, the portions of the correction electrode 113' arranged above and below the electron beam passage hole are connected to form an integrated component, and the connecting portion is curved in a concave shape as shown in FIG. 8(a). Similar to the embodiment in FIG. 7, the influence of the side wall of the first member 111 is alleviated.

以上の実施例では、電子銃主レンズを２つの電極で構成
する。いわゆるパイ　ポテンシャル　フォーカシング（
Ｂｉ−Ｐｏｔｅｎｔｉａｌ　Ｆｏｃｕｓｉｎｇ）レンズ
、すなわちＢＰＦレンズのみを対象としているが、３つ
の電極で構成する、いわゆる（ユニ　ポテンシャル　フ
ォーカシング（Ｕｎｉ　−ＰｏｔｅｎｔｉａｌＦｏｃｕ
ｓｉｎｇ）レンズ、すなわちＵＰＦレンズの集束電極に
本発明を適用することも可能であり、さらにこれらのレ
ンズを組み合わせた多段形の主レンズにも適用可能であ
る。In the above embodiments, the electron gun main lens is composed of two electrodes. So-called pi potential focusing (
Although the target is only Bi-Potential Focusing lenses, that is, BPF lenses, so-called (Uni-Potential Focusing) lenses, which are composed of three electrodes,
It is also possible to apply the present invention to a focusing electrode of a UPF lens (sing) lens, that is, a UPF lens, and furthermore, it is applicable to a multistage main lens that is a combination of these lenses.

〔発明の効果〕〔Effect of the invention〕

本発明によれば、カラー受像管において、電子ビーム偏
向に起因する非点収差の補正とダイナミックフォーカス
とを同時に実現できるので、画面周辺部の解像度が太り
に向上する。このとき、電子銃組立に対して従来の非点
収差補正を行う電子銃に要求されるほどの高精度を必要
としないので。According to the present invention, in a color picture tube, it is possible to simultaneously correct astigmatism caused by electron beam deflection and dynamic focus, thereby significantly improving the resolution of the peripheral portion of the screen. At this time, the electron gun assembly does not require as high precision as is required for conventional electron guns that perform astigmatism correction.

製造コストの増大を防ぐことができる。It is possible to prevent an increase in manufacturing costs.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明の一実施例の電子銃の縦断面図および、
主要部の横断面図、第２図は従来の電子銃を備えたカラ
ー受像管の縦断面図、第３図は従来電子銃によるカラー
受像管画面各部の電子ビームスポット形状の模式図、第
４図、第５図は従来の電子銃の縦断面図および主要部の
平面図、第６図は本発明実施例の電子銃特性の解析結果
を示したグラフ、第７図は本発明の他の実施例の電子銃
の要部平面図、第８図は本発明の他の実施例の電子銃要
部の平面図および側面図である。 １・・・ガラス外囲器、２・・・フェイスプレイド、３
・・・蛍光面、４・・・シャドウマスク、５・・・導電
膜、６゜７．８・・・陰極、９・・・Ｇ１電極、１０・
・・Ｇ２電極、１１・・・集束電極、１２・・・加速電
極、１３・・・遮蔽カップ、１４・・・外部磁気偏向ヨ
ーク、１５，１６゜１７・・・電子ビーム初期通路、１
１１・・・集束電極第１部材、１１２・・・集束電極第
２部材、１１３゜猶１図 （ｂ） ｔ　４　　図 （）））　　　　ｔ／１１ （す １６　図FIG. 1 is a longitudinal sectional view of an electron gun according to an embodiment of the present invention, and
2 is a longitudinal sectional view of a color picture tube equipped with a conventional electron gun, 3 is a schematic diagram of the electron beam spot shape of each part of the color picture tube screen by a conventional electron gun, and 4 is a cross-sectional view of the main parts. 5 is a vertical cross-sectional view and a plan view of the main parts of a conventional electron gun, FIG. 6 is a graph showing the analysis results of the electron gun characteristics of the embodiment of the present invention, and FIG. FIG. 8 is a plan view of a main part of an electron gun according to another embodiment of the present invention. FIG. 1...Glass envelope, 2...Face playd, 3
... Fluorescent screen, 4... Shadow mask, 5... Conductive film, 6°7.8... Cathode, 9... G1 electrode, 10...
... G2 electrode, 11... Focusing electrode, 12... Accelerating electrode, 13... Shielding cup, 14... External magnetic deflection yoke, 15, 16° 17... Electron beam initial path, 1
11... Focusing electrode first member, 112... Focusing electrode second member, 113°

Claims (1)

【特許請求の範囲】 １、複数の電子ビームを発生させ、かつこれらの電子ビ
ームを一水平面上の互いに平行な初期通路に沿つて蛍光
面へ指向させる第１の電極手段と、上記各電子ビームを
蛍光面に集束させるための主レンズを構成する第２の電
極手段と、各電子ビームを偏向させ、蛍光面上で走査さ
せるための偏向ヨークとを具備したカラー受像管電子銃
において、上記主レンズを構成する電極のうち、最高電
圧を印加された加速電極に隣接した集束電極を第１部材
と第２部材の２つの部材から構成し、第１部材は加速電
極に隣接して配置し、第１部材の、加速電極と反対側で
、第２部材と対向する端面に設けられた電子ビーム通過
孔の上下に、第２部材の第１部材との対向端面に設けら
れた単一の開孔を通じて、第２部材内部にまで延長され
た板状電極を第１部材と電気的に接触させて配置し、第
１部材に、電子ビームが偏向されないときは第２部材に
印加される一定電圧と同一の電圧が、電子ビームが偏向
されるときは、上記一定電圧を上まわり、上記一定電圧
に対する増分は偏向量の増大とともに増加するような電
圧が印加されることを特徴とするカラー受像管用電子銃
。 ２、上記電子ビーム通過孔上下の上記板状電極の間の間
隔が、上記板状電極中央部よりも端部において短くなつ
ていることを特徴とする、特許請求の範囲第１項記載の
カラー受像管用電子銃。 ３、上記電子ビーム通過孔上下の上記板状電極が両端で
接続され、接続部分の上記第１部材方向への延長量が、
上記板状電極付近で大きく、その中間部で小さくなつて
いることを特徴とする、特許請求の範囲第１項記載のカ
ラー受像管用電子銃。[Claims] 1. A first electrode means for generating a plurality of electron beams and directing these electron beams toward a phosphor screen along mutually parallel initial paths on one horizontal plane; In the color picture tube electron gun, the color picture tube electron gun is equipped with a second electrode means constituting a main lens for focusing the electron beams on the phosphor screen, and a deflection yoke for deflecting each electron beam and scanning it on the phosphor screen. Among the electrodes constituting the lens, a focusing electrode adjacent to the accelerating electrode to which the highest voltage is applied is composed of two members, a first member and a second member, the first member is arranged adjacent to the accelerating electrode, A single opening is provided on the end surface of the second member facing the first member above and below the electron beam passage hole provided on the end surface of the first member opposite the accelerating electrode and facing the second member. A plate-shaped electrode extending into the second member through the hole is placed in electrical contact with the first member, and a constant voltage is applied to the first member and the second member when the electron beam is not deflected. for a color picture tube, characterized in that when the electron beam is deflected, a voltage is applied such that when the electron beam is deflected, the voltage exceeds the above-mentioned constant voltage, and the increment with respect to the above-mentioned constant voltage increases as the amount of deflection increases. electron gun. 2. The collar according to claim 1, wherein the interval between the plate-shaped electrodes above and below the electron beam passage hole is shorter at the ends than at the center of the plate-shaped electrodes. Electron gun for picture tube. 3. The plate-shaped electrodes above and below the electron beam passage hole are connected at both ends, and the amount of extension of the connected portion toward the first member is:
The electron gun for a color picture tube according to claim 1, wherein the electron gun is large near the plate-shaped electrode and becomes small in the middle thereof.