JPS59127346A - Color picture tube electron gun - Google Patents
Color picture tube electron gunInfo
- Publication number
- JPS59127346A JPS59127346A JP117083A JP117083A JPS59127346A JP S59127346 A JPS59127346 A JP S59127346A JP 117083 A JP117083 A JP 117083A JP 117083 A JP117083 A JP 117083A JP S59127346 A JPS59127346 A JP S59127346A
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- plates
- astigmatism
- cup
- horizontal
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
- H01J29/48—Electron guns
- H01J29/50—Electron guns two or more guns in a single vacuum space, e.g. for plural-ray tube
- H01J29/503—Three or more guns, the axes of which lay in a common plane
Abstract
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は、カラー受像管用電子銃に関し、特に主レンズ
を構成する電極に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an electron gun for a color picture tube, and more particularly to an electrode constituting a main lens.
第１図は、従来の電子銃を備えたカラー受像管の断面図
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色の螢光体を交互にストライプ状に塗布した螢光
面３が支持されている。陰極６，７，８の中心軸１５，
１６．１７は、陰極とともに三極部を構成するＧ１電極
９およびＧ２電極１０と、主レンズを構成するＧ３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、ならびに、Ｇ３電極の開孔部と接続する内円筒
２０，２１．２２の中心軸と一致し、共通平面状に、互
いにほぼ平行に配置されている。FIG. 1 is a sectional view of a color picture tube equipped with a conventional electron gun. On the inner wall of the face plate portion 2 of the glass envelope 1, a phosphor surface 3 is supported, in which phosphors of three colors are coated alternately in stripes. central axis 15 of cathodes 6, 7, 8;
16.17 is an opening corresponding to the cathode of the G1 electrode 9 and the G2 electrode 10 which together with the cathode constitute the triode part, the G3 electrode 11 and the shielding cup 13 which constitute the main lens, and the opening of the G3 electrode. They coincide with the central axes of the inner cylinders 20, 21, 22 that connect with the openings, and are arranged substantially parallel to each other in a common plane.
主レンズを構成するもう一方の電極であるＧ４電極１２
の中央の開孔部ならびに、それと接続する内円筒２４の
中心軸は、丑記中心＠１６と一致しているが、外側の両
開孔ならびに、それらの接続する内円筒２３．２５の中
心軸１８．１９はそれぞれに対応する中心’Ｈ１］１５
，１７と一致せず、外側にわずかに変位している。各内
円筒の内径は対応する開孔の径と一致する。各陰極から
射出される３本の電子ビームは、中心軸１５，１６゜１
７に沿って、三極部から主レンズへと入射する。G4 electrode 12, which is the other electrode that constitutes the main lens
The central aperture and the central axis of the inner cylinder 24 that connects it coincide with the center @16, but the central axes of both outer apertures and the inner cylinder 23 and 25 that connect them coincide with 18.19 are the corresponding centers 'H1]15
, 17, and is slightly displaced outward. The inner diameter of each inner cylinder matches the diameter of the corresponding aperture. The three electron beams emitted from each cathode have central axes of 15 and 16 degrees.
7 from the triode to the main lens.
Ｇ３電極１１はＧ４電極１２よシ低い電位に設定され、
高電位の０４電極１２は、遮蔽カップ１３、ガラス外囲
器ｌの内壁に設けられた導電膜５と同電位になっている
。Ｇ３，０４両電極の中央部の開孔と内円筒２１．２４
は同軸になっておシ、また、内円筒が、非軸対称の電極
外周部からの影響をうち消すので、中央に形成される主
レンズは軸対称となシ、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。一方、両電
極の外側の開孔と、内円筒２０，２２、ならびに２３．
２５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、Ｇ４電極側に形成てれる発散レンズ
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
ム方向への集中力をうける。こうして、３本の電子ビー
ムは、シャドウマスク４上で、結像すると同時に、互い
に重なシ合う様に集中する。この様に１各ビームを集中
させる操作を、静コンバーゼンス（以後、ＳＴＣと略す
）と呼ぶ。さらに、各電子ビームは、シャドウマスク４
により色選別をうけ、各ビームに対応する色の螢光体を
励起発光させる成分だけが、シャドウマスタ４の開孔を
通過し、螢光面３に到る。また、電子ビームを螢光面上
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。The G3 electrode 11 is set to a lower potential than the G4 electrode 12,
The high-potential 04 electrode 12 has the same potential as the shielding cup 13 and the conductive film 5 provided on the inner wall of the glass envelope l. G3,04 Opening in the center of both electrodes and inner cylinder 21.24
are coaxial, and since the inner cylinder cancels out the influence from the non-axisymmetric electrode outer periphery, the main lens formed in the center is axisymmetric, and the central beam is focused by the main lens. After that, it moves straight along the trajectory along the axis. On the other hand, the outer apertures of both electrodes, the inner cylinders 20, 22, and 23.
Since the axes of the lens elements 25 are shifted 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 G4 electrode side, and at the same time the main lens focuses the outer beam. Gain concentration in a direction. In this way, the three electron beams form images on the shadow mask 4 and at the same time are concentrated so as to overlap each other. The operation of concentrating each beam in this manner is called static convergence (hereinafter abbreviated as STC). Furthermore, each electron beam is exposed to a shadow mask 4.
Only the components that excite the phosphor of the color corresponding to each beam and cause it to emit light pass through the apertures of the shadow master 4 and reach the phosphor surface 3. Further, an external magnetic deflection yoke 14 is provided to scan the electron beam on the fluorescent surface.
最近のカラー受像管では、磁気偏向ヨークとして、自己
集中形ヨークを用いることにより、螢光面の中心で靜コ
ンバーゼンスがとれていれば螢光面全体にわたって走査
しても、ビームの集中を維持できるので、調整が非常に
容易になっている。In recent color picture tubes, by using a self-focusing yoke as the magnetic deflection yoke, it is possible to maintain the beam concentration even when scanning over the entire fluorescent surface as long as there is a quiet convergence at the center of the fluorescent surface. Therefore, adjustment is very easy.
ところが、この種のヨークは、自己集中特性を得るため
、ビームに非点収差を与える様に設計されている。この
ため、ビームは整列方向（以後、水平方向と記す）で弱
く集束され、それと垂直な方向で強く集束され、螢光面
上の偏向時のビームスポットは、無偏向時に比較し、水
平方向に引き伸ばされ、さらに垂直方向にノ・口と呼ば
れる低輝度部分がひろがり、解像度の劣化を招く。これ
を水平方向の非点収差とよぶ。また、上記の非点収差は
、他の原因からも生ずる。内円筒２０〜２５は、３本の
電子ビームを集束する主レンズが、それぞれ軸対称形状
となる様に設けられているが、その軸方向長さが必要な
値以下になると、外部の、非軸対称構造をした電極１１
．１２の影響をうける。However, this type of yoke is designed to impart astigmatism to the beam in order to obtain self-focusing characteristics. For this reason, the beam is weakly focused in the alignment direction (hereinafter referred to as the horizontal direction) and strongly focused in the direction perpendicular to it, and the beam spot when deflected on the fluorescent surface is more horizontal than when it is not deflected. As the image is stretched, a low-brightness area called the no-guchi spreads out in the vertical direction, leading to a deterioration in resolution. This is called horizontal astigmatism. The astigmatism described above also arises from other causes. The inner cylinders 20 to 25 are provided with main lenses that focus the three electron beams so that they are axially symmetrical, but when the axial length of the main lenses becomes less than a required value, the external Electrode 11 with an axially symmetrical structure
．． Influenced by 12.
このため主レンズも非軸対称となシ、電子ビームは非点
収差をうける。特に、Ｇ３側の内円筒２０〜２２の長さ
は、Ｇ４側内円筒２３〜２５よりも長い必要があるが、
必要な値よりも短くなると、垂直方向に強く収束力が働
き、自己集中形ヨーク ゛と同様、水平方向の非点収差
が生じる。Therefore, the main lens is also non-axially symmetrical, and the electron beam suffers from astigmatism. In particular, the length of the inner cylinders 20 to 22 on the G3 side needs to be longer than the inner cylinders 23 to 25 on the G4 side,
If it is shorter than the required value, a strong focusing force will act in the vertical direction, causing astigmatism in the horizontal direction, similar to a self-focusing yoke.
さらに、％願昭５５−１３７８００ に開示したＳＴＣ
方式を適用した電子銃では、両側の内円筒２０．２２，
２３，２５の先端が斜めに切断された形状をしており、
特に０３車極では内円筒２０゜２２が中央の内円筒２１
に隣接した部分で短くなるように切断されるため、中央
の内円筒２０が短くなったと同一の効果が生じ、中央の
電子ビームに対し、水平方向の非点収差が生じる。Furthermore, the STC disclosed in %Application No. 137800/1983
In the electron gun to which this method is applied, the inner cylinders 20, 22 on both sides,
The tips of 23 and 25 are cut diagonally,
Especially on the 03 car pole, the inner cylinder 20°22 is the center inner cylinder 21
Since the central inner cylinder 20 is cut short in the adjacent portion, the same effect occurs as if the central inner cylinder 20 were shortened, and horizontal astigmatism is produced for the central electron beam.
この非点収差を取り除くため、電子ビーム形状が垂直方
向に引きのばされる様な垂直方向の非点収差を意図的に
与え、水平方向の非点収差と互いに打ち消し合わせるこ
とが必要となる。In order to eliminate this astigmatism, it is necessary to intentionally provide vertical astigmatism such that the electron beam shape is stretched in the vertical direction, and to cancel it out with the horizontal astigmatism.
特開昭５１−１１８９５７ には、Ｇ３，０４電極の互
いに対向する開孔の左右、あるいは上下に平行な極板を
設ける技術が開示されている。しかし、−この位置に設
けられた極板は、互いの間隔を上記開孔の直径より小さ
くできないという欠点がある。Japanese Patent Application Laid-Open No. 51-118957 discloses a technique in which parallel plates are provided on the left and right or above and below the mutually opposing openings of the G3 and 04 electrodes. However, - the electrode plates provided in this position have the disadvantage that the distance between them cannot be smaller than the diameter of the aperture.
すなわち、開孔の直径は、解像度向上のため可能な限シ
大きくするので、上記間隔も大きくなシ、このため、電
子ビームに与える影響は逆に小さくなる。しかも、この
極板は上記開孔と接続する内円筒の外側に設ける必要が
あるので、内円筒によつて極板の効果がシールドされ、
電子ビームに与える影響はさらに減少する。このだめ、
水平方向の非点収差を打消すだけの十分大きな垂直方向
の非点収差を発生させることができず、非点収差を確実
に補正することは困難である。That is, since the diameter of the aperture is made as large as possible in order to improve the resolution, the above-mentioned interval is also large, and therefore the influence on the electron beam is conversely reduced. Moreover, since this electrode plate needs to be provided outside the inner cylinder that connects to the opening, the effect of the electrode plate is shielded by the inner cylinder.
The influence on the electron beam is further reduced. This is no good,
It is difficult to generate vertical astigmatism large enough to cancel out horizontal astigmatism, and it is difficult to reliably correct astigmatism.
また、フォーカス特性、ＳＴＣ特性に大きな影響を与え
るＧ３．Ｇ４電極対向面の平面度、あるいは平行度を、
極板取付時に悪化させてしまい、いう問題点がある。In addition, G3. The flatness or parallelism of the G4 electrode facing surface,
There is a problem in that the problem is exacerbated when attaching the electrode plate.
本発明の目的は、上記の問題点をことごとく解決し、上
記水平方向の非点収差を確実に補正することが可能なカ
ラー受像管電子銃を提供することにある。An object of the present invention is to provide a color picture tube electron gun that can solve all of the above problems and reliably correct the horizontal astigmatism.
一般に、カラー受像管電子銃では、Ｇ３電極に低電位が
、０４′Ｍ極に高電位がそれぞれ印加され、Ｇ３電極の
内部に集束レンズ、Ｇ４電極の内部に発散レンズが形成
される、両レンズの合成により主レンズが形成される。Generally, in a color picture tube electron gun, a low potential is applied to the G3 electrode and a high potential is applied to the 04'M pole, and a focusing lens is formed inside the G3 electrode and a diverging lens is formed inside the G4 electrode. The main lens is formed by combining the two.
Ｇ４電極側では、０３ｔＭ極の低電位が侵入するが、こ
の侵入が深くなると発散レンズが弱くなシ、侵入が浅い
と強くなる。On the G4 electrode side, the low potential of the 03tM pole penetrates, but the deeper the penetration, the weaker the diverging lens becomes, and the shallower the penetration, the stronger it becomes.
そこで、本発明は、遮蔽カップに、その開孔の上下で接
続し、Ｇ４電極内部にはり出した極板を設け、この極板
によシ水平方向の非点収差を補正する。すなわち、本発
明により追加される極板は、Ｇ４電極と接続され、高電
位が加えられているため、垂直方向では低電位の侵入が
抑えられ、水平方向には極板が無いため、侵入は抑えら
れない。Therefore, in the present invention, electrode plates are connected to the shielding cup at the upper and lower portions of the opening thereof and protrude inside the G4 electrode, and the astigmatism in the horizontal direction is corrected by this electrode plate. In other words, the electrode plate added according to the present invention is connected to the G4 electrode and a high potential is applied to it, so the intrusion of low potential is suppressed in the vertical direction, and since there is no plate in the horizontal direction, the intrusion is prevented. I can't control it.
このため、垂直方向の発散レンズだけが強くなり、ビー
ムは垂直方向に引き伸ばされ、垂直方向の非点収差が発
生し、水平方向の非点収差を相殺することができ、上記
目的を達成できる。Therefore, only the vertical diverging lens becomes strong, the beam is stretched in the vertical direction, vertical astigmatism occurs, and horizontal astigmatism can be canceled out, so that the above objective can be achieved.
遮蔽カップの開孔は、一般に０３，０４ｍ極の対向面の
開孔よりも径が小さいため、極板の間隔を狭く設定でき
るので、電位の侵入をよシ効果的に抑えることができ、
水平方向の非点収走を確実に補正できる。また、フォー
カス特性、Ｓ’Ｊ’Ｃ特性に大きな影響を与えるＧ３．
Ｇ４電極対向面の工作精度を、極板取付時に悪化させる
ことが無いので、主レンズのフォーカス特性、５ＴＣｅ
性に何らの悪影響を与えることなく、非点収差を補正す
ることができる。The openings in the shielding cup are generally smaller in diameter than the openings on the opposing surfaces of the 03 and 04m poles, so the spacing between the electrode plates can be set narrower, making it possible to more effectively suppress the intrusion of potential.
Horizontal astigmatism can be reliably corrected. In addition, G3. which has a great influence on focus characteristics and S'J'C characteristics.
Since the machining accuracy of the G4 electrode facing surface does not deteriorate when attaching the electrode plate, the focus characteristics of the main lens, 5TCe
Astigmatism can be corrected without any adverse effect on the image quality.
第２図および第３図は本発明の一実施例の要部（主レン
ズ部〕を示す断面図であり、ＳＴＣをとるために、両サ
イドの内円筒を斜めに切断した電極＠造からなる主レン
ズに本発明を適用した場合の例を示す。Figures 2 and 3 are cross-sectional views showing the main part (main lens part) of an embodiment of the present invention, which is made of an electrode structure in which the inner cylinders on both sides are cut diagonally in order to obtain STC. An example in which the present invention is applied to a main lens will be shown.
第２図は、本発明電子銃の主レンズ部の水平方向断面を
示し、第３図はその垂直方向断面を示す。FIG. 2 shows a horizontal cross section of the main lens portion of the electron gun of the present invention, and FIG. 3 shows a vertical cross section thereof.
図において、２６及び２６′が、本発明による電位補正
用の極板であり、これを除いた他の電極構成、特に内円
筒２０〜２５の形状およびその効果については、上記し
た特願昭５５−１３７８００に詳細に記載されておシ、
その説明は省略する。かかる構造の主レンズでは、Ｇ３
電極１１においては、サイドビーム用の内円筒２０．２
２が中央ビーム用の内円筒２１に隣接する部分で短くな
るように、傾めに切断されているため、上述したように
、中央ビームを水平方向に引き伸ばす非点収差が発生す
る。この非点収差を補正するために、本実施例では、Ｇ
４電極１２の中央ビーム出口の上下に、電位補正用の極
板２６，２６’を設ける。In the figure, reference numerals 26 and 26' are electrode plates for potential correction according to the present invention, and other electrode configurations other than these, particularly the shapes of the inner cylinders 20 to 25 and their effects, are described in the above-mentioned Japanese Patent Application No. 55 -137800 in detail,
The explanation will be omitted. In the main lens with such a structure, G3
In the electrode 11, the inner cylinder 20.2 for the side beam
2 is cut at an angle so that it becomes shorter at the portion adjacent to the inner cylinder 21 for the central beam, and as described above, astigmatism occurs that stretches the central beam in the horizontal direction. In order to correct this astigmatism, in this embodiment, G
Pole plates 26 and 26' for potential correction are provided above and below the central beam exit of the four electrodes 12.
即ち、遮蔽カップ１３は、カップ状電極からなり、その
底面つまｐＧ４電極との対向面には、３本のビームがそ
れぞれ通過する開孔３０，３１．３２が設けられておシ
１．・これら開孔の中心軸は、陰極６．７．８の中心軸
１５，１６．１７と一致している。また、開孔３０，３
１．３２の径は、それぞれ対応する内円筒２３，２４．
２５の内径よりも小さい。そして、極板２６，２６’は
開孔３１の上下、つまシ開孔３１の中心軸を通る水平方
向軸に対して対称に、かつ該水平方向軸と平行に配置さ
れ、遮蔽カップ１３の底面に電気的に接続さ１°３およ
び極板２６，２６’は電気的に接続され、同電位が印加
される。図において、２７．２７’。That is, the shielding cup 13 is made of a cup-shaped electrode, and the bottom surface thereof, which faces the pG4 electrode, is provided with openings 30, 31, and 32 through which the three beams pass, respectively. - The central axes of these openings coincide with the central axes 15, 16.17 of the cathode 6.7.8. Also, the openings 30, 3
The diameter of 1.32 is the corresponding inner cylinder 23, 24 .
smaller than the inner diameter of 25. The electrode plates 26 and 26' are disposed above and below the aperture 31, symmetrically with respect to a horizontal axis passing through the central axis of the tab aperture 31, and parallel to the horizontal axis, and are arranged on the bottom surface of the shielding cup 13. 1°3 and the plates 26, 26' are electrically connected and the same potential is applied. In the figure, 27.27'.
２８．２８’は、いずれも、Ｇ４電極内部に侵入する同
電位の等電位線を示す。２７．２７’は、極板２６，２
６’が無いときのそれぞれ水平方向、垂直方向の等電位
線を破線で表わしたもの、２８゜２８′は極板２６，２
６’を設けたときの水平方向、垂直方向の等電位線を実
線で表わしたものである。極板を設けることばより、垂
直方向の等電位線の侵入を強く抑えることができる。こ
れによシ、垂直方向の発散レンズが強くなり、ビームは
垂直方向に引き伸ばされる。28 and 28' both indicate equipotential lines of the same potential that penetrate into the G4 electrode. 27.27' is the electrode plate 26,2
The horizontal and vertical equipotential lines when 6' is not present are represented by broken lines, and 28°28' is the polar plate 26, 2.
The equipotential lines in the horizontal and vertical directions when 6' is provided are shown by solid lines. By providing the electrode plates, the invasion of vertical equipotential lines can be strongly suppressed. This strengthens the vertically diverging lens and stretches the beam vertically.
次に本実施例の具体的な寸法と、その効果を定倉的に示
す。Next, the specific dimensions of this embodiment and its effects will be explained in detail.
Ｇ３．Ｇ４電極（外周部〕の水平方向内径２１謔
Ｇ３．ｏ４を極（外周部）の垂直方向内径９．６ブ
内円筒２０〜２５の内径 ５．５罪中央ビ
一ム用内円筒２１．２４の軸方向長３、 Ｏｒｒｒｔｎ
サイドビーム用内円筒２０，２２，２３．２５の軸方向
長 ２５〜０．７聞０４屯極（外周
部）の軸方向長 ６． Ｏｒａｎ遮蔽遮蔽カッ孔
開孔径４電極側） ３． Ｏｔｒａｎ極板２６，
２６’の水平方向幅Ｗ ４．０ ｗｎＧ４電極電
圧 ２５．０ＫＶＧ３電極のＧ４電
極側端面から螢光面までの軸方向距離
３４０ｍｍとし、極板２６，２６’の軸方向
長さを、第３図中に示したようにｔとする。また、同様
に第３図中に示したように、極板２６，２６’の中心軸
（電子銃の中心軸でるシ、第１図では中心軸１６に相当
する。）からの距離をｈとする。G3. Horizontal internal diameter of G4 electrode (outer periphery) 21cm G3.O4 vertical internal diameter of electrode (outer periphery) 9.6cm Inner diameter of inner cylinders 20 to 25 5.5cm Inner cylinder for central beam 21.24 Axial length of 3, Orrrtn Axial length of inner cylinder 20, 22, 23.25 for side beam 25-0.7 Axial length of 04 ton pole (outer circumference) 6. Oran shielding hole opening diameter 4 electrode side) 3. Otran plate 26,
26' horizontal width W 4.0 wnG4 electrode voltage 25.0KV Axial distance from the G4 electrode side end surface of G3 electrode to the fluorescent surface
340 mm, and the axial length of the electrode plates 26, 26' is t as shown in FIG. Similarly, as shown in FIG. 3, the distance from the central axis of the electrode plates 26, 26' (which is the central axis of the electron gun, and corresponds to the central axis 16 in FIG. 1) is h. do.
ここで、水平方向集束電圧Ｖｆｈと、垂直方向集束電圧
Ｖ ｆ ｖを以下のように定義する。Here, the horizontal focusing voltage Vfh and the vertical focusing voltage Vfv are defined as follows.
すなわち、水平方向断面に沿って主レンズに入射する電
子ビームの集束位置が螢光面と一致するときの集束電圧
（Ｇ３電極電圧）を水平方向集束電圧Ｖｆｈｓ垂直方向
断面に沿って主レンズに入射する電子ビームの集束位置
が螢光面と一致するときの集束電圧を、垂直方向集束電
圧Ｖｆｖとする。That is, the focusing voltage (G3 electrode voltage) when the focusing position of the electron beam incident on the main lens along the horizontal cross section coincides with the fluorescent surface is the horizontal focusing voltage Vfhs, which is incident on the main lens along the vertical cross section. The focusing voltage when the focusing position of the electron beam coincides with the fluorescent surface is defined as the vertical focusing voltage Vfv.
ＶｆｈとＶｆｖが一致すれば非点収差は生じない。If Vfh and Vfv match, no astigmatism will occur.
まだ、Ｖｆｈ＜ｖｆｖならば水平方向の、Ｖｔ ｈ ＞
Ｖｆｖならば垂直方向の非点収差が生じていることに
なる。If Vfh<vfv, then in the horizontal direction, Vt h >
If it is Vfv, it means that vertical astigmatism has occurred.
第４図に、水平、垂は方向の集束電圧の差Ｖｆｈ−ｖｆ
ｖと、極板２６，２６’の軸方向長さｔとの関係を示す
。これは、距離りをパラメータとして、３次元電場分布
を数値計算によって求め、さらにその電場内の電子ビー
ム軌道を解析して求めたものである。なお電子ビームの
集束位置は、中心軸から水平めるいは垂直方向に、０．
５°の角度で出射された電子ビームが主レンズによって
集束され、再び中心軸と交叉する点として求めた。Figure 4 shows the difference in focusing voltage in the horizontal and vertical directions, Vfh - vf.
The relationship between v and the axial length t of the electrode plates 26, 26' is shown. This is obtained by numerically calculating a three-dimensional electric field distribution using distance as a parameter, and then analyzing the electron beam trajectory within the electric field. Note that the focusing position of the electron beam is 0.0 mm horizontally or vertically from the central axis.
The electron beam emitted at an angle of 5° was focused by the main lens, and the point was determined to intersect the central axis again.
第４図から分るように、ｔ＝０、すなわち極板の無いと
きにＨｌｖｆｈ （Ｖｔｖであシ、水平方向の非点収差
が生じている。極板を延長していくことにより、垂直方
向の非点収差が発生して水平方向の非点収差をうち消し
ていく。””１．５ｍ、７＝２．３喘のとき、水平方向
、垂直方向の非点収差は完全に互いをうち消しあい、ｖ
ｆｈ＝■ｆｖとなり、水平方向の非点収差を完全に補正
することができる。As can be seen from Figure 4, when t = 0, that is, when there is no plate, Hlvfh (Vtv) causes horizontal astigmatism. By extending the plate, vertical astigmatism Astigmatism occurs and cancels out the horizontal astigmatism.''At 1.5m and 7=2.3mm, the horizontal and vertical astigmatism completely cancel each other out. Eliminate, v
fh=■fv, and horizontal astigmatism can be completely corrected.
なお、本実施例では、極板として矩形の形状のものを示
したが、他にも、円筒の一部を切シ取った形状等、種々
の形状を用いることができる。In this embodiment, the electrode plate has a rectangular shape, but various other shapes can be used, such as a shape in which a part of a cylinder is cut out.
また、遮蔽カップ１３にプレス加工を施し、極板２６，
２６’を一体で整形することにより、部品点数の増加を
抑えることができる。In addition, the shielding cup 13 is pressed, and the electrode plate 26,
By integrally shaping 26', an increase in the number of parts can be suppressed.
第５，６図は、それぞれ本発明の他の実施例の要部を示
し、遮蔽カップと一体化された電界補正板を設けた電子
銃主レンズの垂直方向の断面図でるる。第５図は、ビー
ム通過孔部分をプレス加工して極板を形成した例、第６
図はビーム通過孔の上下部分をプレス加工して極板を形
成した例でるる。5 and 6 show essential parts of other embodiments of the present invention, and are vertical sectional views of an electron gun main lens provided with an electric field correction plate integrated with a shielding cup. Figure 5 shows an example of forming an electrode plate by pressing the beam passage hole portion, and Figure 6
The figure shows an example in which the upper and lower parts of the beam passage hole are pressed to form electrode plates.
さらに、本発明は、第１図に示したパイポテンシャル型
主レンズのみならず、ユニポテンシャル型、またはその
他の型の主レンズにも適用できることは勿論である。Furthermore, it goes without saying that the present invention can be applied not only to the pi-potential type main lens shown in FIG. 1, but also to uni-potential type or other types of main lenses.
まだ、上述の説明では、補正用極板を遮蔽カップの０４
−に極側端面に設けだが、Ｇ４電極として、′電子ビー
ム出射側にも閉成端面（勿論、電子ビーム通過孔が形成
されている）を有する電極構造を用いる場合には、補正
用極板はこの閉成端面に設けられる。However, in the above explanation, the correction electrode plate is placed at 04 of the shielding cup.
- is provided on the pole side end face, but when using an electrode structure that has a closed end face on the electron beam exit side (of course, an electron beam passage hole is also formed) as the G4 electrode, it is necessary to use a correction electrode plate. is provided on this closed end surface.
本発明によれば、簡単な構造の極板を０４電極内部に付
加すること（てよシ、ビームを垂直方向に引き伸ばす様
な非点収差を与えることができ、もって水平方向の非点
収差を確実に補正することができる。しかも、極板はＧ
４電極のビーム出射側に設けられ、Ｇ４電極の０３電極
対向面の工作精度を悪化させることが無いので、主レン
ズのフォーカス時性、Ｓ’Ｉ”Ｃ特性に何らの悪影響を
与えることなく、非点収差を補正することができる。According to the present invention, by adding a simple plate inside the 04 electrode, it is possible to provide astigmatism that stretches the beam in the vertical direction, thereby reducing horizontal astigmatism. It can be corrected reliably.Moreover, the electrode plate is G
It is provided on the beam exit side of the 4 electrodes, and does not deteriorate the machining accuracy of the surface of the G4 electrode that faces the 03 electrode, so it does not have any negative effect on the focus time and S'I"C characteristics of the main lens. Astigmatism can be corrected.
第１図は、インライン型カラー受像管の概略を示す断面
図、第２図は、本発明の一実施例の主レンズを示す水平
方向断面図、第３図は、同じく主レンズを示す垂直方向
断面図、第４図は、本発明の詳細な説明するだめの図、
第５図および第６図は、それぞれ本発明の他の実施例の
主レンズを示す垂直方向断面図でるる。
１・・・ガラス外囲器、２・・・フェースプレート、３
・・・螢光面、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・・・Ｇ３電極、１２・・・Ｇ４電
極、１３・・・遮蔽カップ、１４・・・外部磁器偏向ヨ
ーク、１５，１６゜１７・・・中心軸、２０，２１，２
２，２３，２４゜２５・・・内部円筒、２６．２６’・
・・垂直方向非点収差発生用極板。
代理人 弁理士 高橋明夫。
第 ２ 図
第 ３ 区
′ｆＩ４− 区
／ρＯρＬFIG. 1 is a sectional view schematically showing an in-line color picture tube, FIG. 2 is a horizontal sectional view showing a main lens according to an embodiment of the present invention, and FIG. 3 is a vertical sectional view showing the main lens. The sectional view, FIG. 4, is a diagram for explaining the present invention in detail,
FIGS. 5 and 6 are vertical sectional views showing main lenses of other embodiments of the present invention, respectively. 1...Glass envelope, 2...Face plate, 3
... Fluorescent surface, 4... Shadow mask, 5... Conductive film, 6°7.8... Cathode, 9... G1 electrode, 10.
... G2 electrode, 11... G3 electrode, 12... G4 electrode, 13... Shielding cup, 14... External porcelain deflection yoke, 15, 16° 17... Central axis, 20, 21, 2
2, 23, 24゜25...Inner cylinder, 26.26'.
... Pole plate for generating vertical astigmatism. Agent: Patent attorney Akio Takahashi. Figure 2 3 Ward'fI4- Ward/ρOρL
Claims (1)
電子ビームを発生する電子ビーム発生手段と、と配電子
ビームの通過孔を有し、と配電子ビーム発生手段と上記
螢光面の間で上記電子ビーム発生手段から順に配置され
た第１．第２及び第３の電極と、上記第２の電極と第３
の電極の間に上記平面に対し互いに対称に配置された一
対の電極板とからなり、上記第１及び第２の電極によシ
上記電子ビームを上記螢光面に集束させるレンズを構成
すると共に、上記一対の電極板によシ上記電子ビームの
非点収差を補正することを特徴とするカシ−受像管電子
銃。 ２、上記第３の電極が、上記第２の電極と同電位のカッ
プ状祇極からなシ、上記一対の電極板が上記カップ状電
極の底面に設けられ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電子銃。[Scope of Claims] 1. An electron beam generating means for generating three electron beams aligned in parallel in the same plane toward a fluorescent surface; and a passage hole for the electron distribution beam; between the beam generating means and the fluorescent surface; second and third electrodes; and the second electrode and the third electrode.
a pair of electrode plates disposed symmetrically with respect to the plane between the electrodes, the first and second electrodes constituting a lens that focuses the electron beam on the fluorescent surface; A Cassie picture tube electron gun, wherein astigmatism of the electron beam is corrected by the pair of electrode plates. 2. A patent claim characterized in that the third electrode is a cup-shaped electrode having the same potential as the second electrode, and the pair of electrode plates are provided on the bottom surface of the cup-shaped electrode. A color picture tube electron gun according to item 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP117083A JPS59127346A (en) | 1983-01-10 | 1983-01-10 | Color picture tube electron gun |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP117083A JPS59127346A (en) | 1983-01-10 | 1983-01-10 | Color picture tube electron gun |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59127346A true JPS59127346A (en) | 1984-07-23 |
| JPH0452586B2 JPH0452586B2 (en) | 1992-08-24 |
Family
ID=11493956
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP117083A Granted JPS59127346A (en) | 1983-01-10 | 1983-01-10 | Color picture tube electron gun |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59127346A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62193044A (en) * | 1986-02-19 | 1987-08-24 | ノキア（ドイッチュランド）ゲー．エム．ベー．ハー | Color image tube |
| JPH0275133A (en) * | 1988-09-09 | 1990-03-14 | Hitachi Ltd | Electron gun assembly of color cathode-ray tube |
| JPH0651300U (en) * | 1992-12-22 | 1994-07-12 | 勝造商事株式会社 | Wall paper |
| US6005339A (en) * | 1995-05-12 | 1999-12-21 | Hitachi, Ltd. | CRT with deflection defocusing correction |
| US6005340A (en) * | 1996-02-27 | 1999-12-21 | Hitachi, Ltd. | CRT, deflection-defocusing correcting member therefor, a method of manufacturing same member, and an image display system including same CRT |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56136434A (en) * | 1980-02-28 | 1981-10-24 | Rca Corp | Color video tube |
| JPS5763750A (en) * | 1980-10-03 | 1982-04-17 | Hitachi Ltd | Control picture tube electron gun |
-
1983
- 1983-01-10 JP JP117083A patent/JPS59127346A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56136434A (en) * | 1980-02-28 | 1981-10-24 | Rca Corp | Color video tube |
| JPS5763750A (en) * | 1980-10-03 | 1982-04-17 | Hitachi Ltd | Control picture tube electron gun |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62193044A (en) * | 1986-02-19 | 1987-08-24 | ノキア（ドイッチュランド）ゲー．エム．ベー．ハー | Color image tube |
| JPH0578896B2 (en) * | 1986-02-19 | 1993-10-29 | Nokia Doitsuchurando Gmbh | |
| JPH0275133A (en) * | 1988-09-09 | 1990-03-14 | Hitachi Ltd | Electron gun assembly of color cathode-ray tube |
| JPH0651300U (en) * | 1992-12-22 | 1994-07-12 | 勝造商事株式会社 | Wall paper |
| US6005339A (en) * | 1995-05-12 | 1999-12-21 | Hitachi, Ltd. | CRT with deflection defocusing correction |
| US6329746B1 (en) | 1995-05-12 | 2001-12-11 | Hitachi, Ltd. | Method of correcting deflection defocusing in a CRT, a CRT employing same, and an image display system including same CRT |
| US6005340A (en) * | 1996-02-27 | 1999-12-21 | Hitachi, Ltd. | CRT, deflection-defocusing correcting member therefor, a method of manufacturing same member, and an image display system including same CRT |
| US6259196B1 (en) | 1996-02-27 | 2001-07-10 | Hitachi, Ltd. | CRT deflection-defocusing correcting member therefor, a method of manufacturing same member, and an image display system including same CRT |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0452586B2 (en) | 1992-08-24 |
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