JPS63105436A - Color picture tube - Google Patents

Color picture tube

Info

Publication number
JPS63105436A
JPS63105436A JP24846286A JP24846286A JPS63105436A JP S63105436 A JPS63105436 A JP S63105436A JP 24846286 A JP24846286 A JP 24846286A JP 24846286 A JP24846286 A JP 24846286A JP S63105436 A JPS63105436 A JP S63105436A
Authority
JP
Japan
Prior art keywords
magnetic shield
shadow mask
color picture
picture tube
tube axis
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
JP24846286A
Other languages
Japanese (ja)
Inventor
Tadanori Okada
忠典 岡田
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
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 Toshiba Corp filed Critical Toshiba Corp
Priority to JP24846286A priority Critical patent/JPS63105436A/en
Publication of JPS63105436A publication Critical patent/JPS63105436A/en
Pending legal-status Critical Current

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  • Electrodes For Cathode-Ray Tubes (AREA)

Abstract

PURPOSE:To prevent a deterioration in the color purity, by making the aperture end of a magnetic shield extend substantially along the form of the outline of the electron scanning area in the section square to the tube axis between a shadow mask structure and an electron gun. CONSTITUTION:Each side of the section form square to the tube axis at both the fluorescent screen 1 side and the electron gun side of the aperture end of a magnetic shield 19 makes a parabola approximately, making a convex to the tube axis. Therefore, since the magnetic shield 19 is along the outline of the scanning area of the electron beams, the external magnetism can be shielded almost evenly, even though it is injected in the direction of the tube axis into the magnetic shield body. Therefore, the influence of the external magnetism to the electron beams can be prevented, and a deterioration of the color purity of the reproduced image when the color picture tube is operated can be prevented over the whole screen.

Description

【発明の詳細な説明】 〔発明の目的〕 (産業上の利用分野) 本発明はカラー受像管に係り、特にその磁気遮蔽体に関
する。
DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a color picture tube, and more particularly to a magnetic shield thereof.

(従来の技術) 一般にシャドウマスク型カラー受像管は、第5図に示す
ように、実質的に矩形状のパネル(13)と、(/6ン 漏斗状のファンネル(14)及びネック(至)から真空
外囲器が構成されている。そしてパネル(13)の内面
には赤、緑及び青に夫々発光する蛍光体層からなる蛍光
体スクリーン(15)が被着形成され、ネック(16)
にはパネル(13)の水平軸に沿って一列に配列され、
赤、緑及び青に対応する3本の電子ビーム(17)が射
出するいわゆる電子銃(18)が配設されている。また
蛍光体スクリーン(15)に近接対向した位置には、多
数の開孔が配列されたシャドウマスク■がマスクフレー
ム(8)によって支持固定されている。さらにマスクフ
レーム0は弾性部材0)を介してパネル(13)の直立
縁部内壁に埋め込まれたスタッドピン(10)で係止さ
れることにより、パネル内に支持されている。
(Prior Art) In general, a shadow mask type color picture tube, as shown in FIG. A vacuum envelope is constructed from the panel (13). A phosphor screen (15) consisting of a phosphor layer that emits red, green, and blue light is adhered to the inner surface of the panel (13), and a neck (16)
are arranged in a row along the horizontal axis of the panel (13);
A so-called electron gun (18) is provided that emits three electron beams (17) corresponding to red, green, and blue. Further, at a position close to and facing the phosphor screen (15), a shadow mask (2) in which a large number of openings are arranged is supported and fixed by a mask frame (8). Further, the mask frame 0 is supported within the panel by being locked with stud pins (10) embedded in the inner wall of the upright edge of the panel (13) via the elastic member 0).

電子ビーム(17)はファンネル(14)の外部の偏向
袋ff1(12)によって偏向され、矩形状のパネル(
13)に対応する略矩形の範囲を走査し、かつシャドウ
マスク■の開孔を介して色選別されて蛍光体層にランデ
ィングし、カラー映像を再現させる。また。
The electron beam (17) is deflected by the deflection bag ff1 (12) outside the funnel (14), and the electron beam (17) is deflected by the deflection bag ff1 (12) outside the funnel (14).
The approximately rectangular area corresponding to step 13) is scanned, the colors are selected through the holes in the shadow mask (2), and the colors land on the phosphor layer to reproduce a color image. Also.

電子ビームは地磁気等の外部磁界の影響を受は蛍光体層
に正確にランディングしない場合があり。
If the electron beam is affected by external magnetic fields such as the earth's magnetism, it may not land accurately on the phosphor layer.

再現映像の色純度が劣化するのを防止するためファンネ
ル(14)内部に強磁性金属板よりなる磁気遮蔽体(1
1)がフレーム■を介して係止されている。
In order to prevent the color purity of the reproduced image from deteriorating, a magnetic shield (14) made of a ferromagnetic metal plate is installed inside the funnel (14).
1) is locked through the frame (■).

磁気遮蔽体の基本的な構造としては第3図に示す様に長
短2相の略台形平板をカラー受像管フェース部に向かう
につれて広がるような組立ての管軸方向面の抜けた8面
体から構成されている6又、一部にはこれ等を僅かに湾
曲した形をもつ1体形状のものもある。
The basic structure of the magnetic shield is, as shown in Figure 3, consisting of an octahedron with a flat surface in the axial direction of the tube, which is constructed by assembling a roughly trapezoidal flat plate with two phases, long and short, that widens toward the face of the color picture tube. There are six prongs, and some have a slightly curved shape.

前述した様に磁気遮蔽体は、電子銃より射出された電子
ビームが蛍光面に射突する迄の道程で偏向装置による磁
気以外の外部磁気1例えば地磁気などを遮蔽するのが主
目的であるが5一般的に被遮蔽物、すなわち電子ビーム
に近接する事が、遮蔽効果を高める上で1重要である。
As mentioned above, the main purpose of the magnetic shield is to shield the electron beam emitted from the electron gun from external magnetism, such as terrestrial magnetism, other than the magnetism caused by the deflection device, on the way to the point where it hits the phosphor screen. 5 Generally, being close to the object to be shielded, that is, the electron beam, is important for enhancing the shielding effect.

しかし被遮蔽物、すなわち電子ビームにどれだけ遮蔽体
が接近するかが効果の大小を決定するにも拘らず、前述
の様な磁気遮蔽体では、電子ビームの偏向により作られ
る走査領域を管軸方向に垂直な断面で見た場合の辺の形
状が第4図に示す如く管軸に向って凸の略放物線形であ
る為、長短各辺の中心近傍では、最も電子ビームから遠
ざかっており、全体として充分な遮蔽効果が得られない
のが現状である。
However, although the magnitude of the effect is determined by how close the shield is to the object to be shielded, that is, the electron beam, in the case of magnetic shields such as those described above, the scanning area created by the deflection of the electron beam is The shape of the side when viewed in a cross section perpendicular to the direction is approximately a parabolic shape convex toward the tube axis as shown in Figure 4, so the vicinity of the center of each long and short side is farthest from the electron beam. At present, a sufficient shielding effect cannot be obtained as a whole.

(発明が解決しようとする問題点) このように従来の磁気遮蔽体では、電子ビームの偏向軌
道に沿う様な形状を採っておらず充分なが劣化してしま
う。
(Problems to be Solved by the Invention) As described above, the conventional magnetic shield does not have a shape that follows the deflection trajectory of the electron beam, and although it is sufficient, it deteriorates.

本発明は色純度の劣化を防止したカラー受像管を提供す
ることを目的とする。
An object of the present invention is to provide a color picture tube that prevents deterioration of color purity.

〔発明の構成〕[Structure of the invention]

(問題点を解決するための手段) 本発明は上記問題を解決するためになされたもので、蛍
光スクリーンとこの蛍光スクリーンに近接して配置され
る多数の透孔が穿設されたシャドウマスクとマスクフレ
ームから成るシャドウマスク構体とこのシャドウマスク
構体に支持された外部磁界を遮蔽するための磁気遮蔽体
と前記シャドウマスク構体を介して前記スクリーンの蛍
光体を選択発光させる電子ビームを射出する電子銃とを
少なくとも備えたカラー受像管において、少なくとも前
記磁気遮蔽体の開口端が前記シャドウマスク構体と前記
電子銃との間であって管軸に垂直な新面での前記電子ビ
ームの走査領域の輪郭の形状に実質的に沿っているため
、管軸方向に進入してくる外部磁気による悪影響を防止
することが可能;となる。
(Means for Solving the Problems) The present invention has been made to solve the above problems, and includes a fluorescent screen and a shadow mask with a large number of through holes arranged close to the fluorescent screen. a shadow mask structure consisting of a mask frame; a magnetic shield supported by the shadow mask structure for shielding an external magnetic field; and an electron gun that emits an electron beam that selectively causes the phosphors of the screen to emit light through the shadow mask structure. In a color picture tube, at least the open end of the magnetic shield is located between the shadow mask structure and the electron gun, and the contour of the scanning area of the electron beam in a new plane perpendicular to the tube axis. Since the tube substantially follows the shape of the tube, it is possible to prevent the adverse effects of external magnetism entering in the tube axis direction.

(作  用) 本発明によれば磁気遮蔽体が電子ビームの走査領域の輪
郭に沿っているため管軸方向の外部磁気が磁気遮蔽体内
に入射してきてもほぼ均一に外部磁気を遮蔽できるので
電子ビームに対する外部磁気の影響を防止することが可
能となる。
(Function) According to the present invention, since the magnetic shielding body follows the outline of the scanning area of the electron beam, even if external magnetism in the tube axis direction enters the magnetic shielding body, the external magnetism can be almost uniformly shielded. It becomes possible to prevent the influence of external magnetism on the beam.

(実 施 例) 以下、本発明の実施例を図面を参照して説明する。(Example) Embodiments of the present invention will be described below with reference to the drawings.

カラー受像管の説明については第5図において前述しで
あるので省略する。
A description of the color picture tube is omitted since it has already been described above in FIG.

第1図は本発明のカラー受像管の磁気遮蔽体と蛍光スク
リーンとの関係を示す模式図である。
FIG. 1 is a schematic diagram showing the relationship between the magnetic shield and the fluorescent screen of the color picture tube of the present invention.

第1図において(19)は磁気遮蔽体、■は蛍光スクリ
ーンである。磁気遮蔽体(19)の開口端は蛍光スクリ
ーンω側及び電子銃側共に管軸に垂直な断面形状の各辺
は管軸に凸な略放物線になっている。
In FIG. 1, (19) is a magnetic shield, and ■ is a fluorescent screen. The open end of the magnetic shield (19) has a cross-sectional shape perpendicular to the tube axis on both the fluorescent screen ω side and the electron gun side, each side of which has a substantially parabolic shape convex to the tube axis.

さらに詳しく述べれば、蛍光スクリーン■の中心■から
の管軸■に沿うV#i離Qにおける磁気遮蔽体(19)
の管軸■に垂直な断面形状の各辺は、距離Qを函数とす
る管軸■から長手辺中心(イ)までの距離Ao(ffi
)と、同様に距@Qを函数とする管軸■から短手辺中心
■までの距離B、(α)と、この位置に対応するように
、やはり距離aを函数とする係数A(Q)、B(Q)を
有する管軸■に凸な放物線となっている。
More specifically, the magnetic shield (19) at V#i distance Q along the tube axis ■ from the center ■ of the fluorescent screen ■
Each side of the cross-sectional shape perpendicular to the tube axis ■ is defined by the distance Ao (ffi
), and the distance B, (α) from the pipe axis ■ to the short side center ■, which similarly has the distance @Q as a function, and the coefficient A (Q ), B(Q) and is a convex parabola on the tube axis (■).

また各函数は管軸を含む平面内で略円を表わす函数とな
る。
Further, each function represents a substantially circle within a plane including the tube axis.

長手辺形状及び短手辺形状は第2図に示す様に、カラー
受像管の画面上の垂直方向をYIIll!!、水平方向
をZ軸とした場合、距離aによりそれぞれY=A(12
)Z”+A、(fl)−・・・=・長手辺形状Z=B(
fl)Y”+I1.(12)・−・−・・短手辺形状で
表わされる。
As shown in Fig. 2, the shape of the long side and the short side are determined in the vertical direction on the screen of the color picture tube. ! , when the horizontal direction is the Z axis, Y=A(12
)Z”+A, (fl)−・・・=・Longer side shape Z=B(
fl)Y”+I1.(12)・−・−・Represented by short side shape.

ここで係数A(Q)、B(2)、位置An(fl)、n
Here, coefficients A(Q), B(2), positions An(fl), n
.

(I2)、Qはカラー受像管のシステム、即ち画面サイ
ズ、偏向角、偏向装置特性に依存するものである。
(I2) and Q depend on the color picture tube system, that is, the screen size, deflection angle, and deflection device characteristics.

例えば15インチ90度偏向型カラー受像管については
概陣次に示すとおりである。
For example, the outline of a 15-inch 90-degree deflection type color picture tube is as follows.

上述の例では磁気遮蔽体の管軸方向のQ =50mm〜
Q”130mmについてのみ数値が示されているが。
In the above example, Q of the magnetic shield in the tube axis direction = 50 mm ~
Although the numerical values are shown only for Q”130mm.

この間での変化は連続的になっている。Changes during this period are continuous.

従って本発明によれば’ll?1I11方向の外部磁気
の入射を防止することが可能となり信頼性の高い高性能
カラー受像管を提供することができる。
According to the invention, 'll? It becomes possible to prevent the incidence of external magnetism in the 1I11 direction, and a highly reliable, high-performance color picture tube can be provided.

尚、本実施例では磁気遮蔽体の蛍光スクリーン側と電子
銃側両方の開口端の各辺を放物線状としたが、電子銃側
のみ開口端を放物線状にしても同様の効果があることは
言うまでもない。
In this example, each side of the opening end on both the fluorescent screen side and the electron gun side of the magnetic shield is made into a parabolic shape, but the same effect can be obtained even if the opening end on the electron gun side only is made into a parabolic shape. Needless to say.

〔、弁明の効果〕[, Effect of excuse]

シ、f′ 以上のように、本発明によればカラー受像管動作時の再
現映像の色純度劣化を画面全面にわたって防止すること
ができる。
h, f' As described above, according to the present invention, it is possible to prevent color purity deterioration of reproduced images over the entire screen during operation of a color picture tube.

【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を示すカラー受像管の要部模
式図、第2図は第1図の要部断面図、第3図は従来の磁
気遮蔽体を示す概略斜視図、第4■・・・蛍光スクリー
ン ■・・・蛍光スクリーン中心■・・・管軸 に)・・・磁気遮蔽体長手辺中心 ■・・・磁気遮蔽体短手辺中心 代理人 弁理士 則 近 憲 佑 同  大胡典夫 第1図 第2図 第3図 第4図 第5図
FIG. 1 is a schematic diagram of the main parts of a color picture tube showing an embodiment of the present invention, FIG. 2 is a sectional view of the main parts of FIG. 1, and FIG. 3 is a schematic perspective view showing a conventional magnetic shield. 4 ■...Fluorescent screen ■...Center of fluorescent screen■...At the tube axis)...Center of the long side of the magnetic shield■...Center of the short side of the magnetic shield Agent Patent attorney Noriyuki Chika Norio Ogo Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

【特許請求の範囲】 1)蛍光スクリーンと、この蛍光スクリーンに近接して
配置される多数の透孔の穿設されたシャドウマスクとマ
スクフレームから成るシャドウマスク構体とこのシャド
ウマスク構体に支持された外部磁界を遮蔽するための磁
気遮蔽体と前記シャドウマスク構体を介して前記スクリ
ーンの蛍光体を選択発光させる電子ビームを射出する電
子銃とを少なくとも備えたカラー受像管において、少な
くとも前記磁気遮蔽体の開口端は前記シャドウマスク構
体と前記電子銃との間であって管軸に垂直な断面での前
記電子ビームの走査領域の輪郭の形状に実質的に沿って
いることを特徴とするカラー受像管。 2)前記磁気遮蔽体の各側壁面の湾曲状態は略放物線状
であ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。 3)前記磁気遮蔽体の電子銃側の開口端のみ前記電子ビ
ームの走査領域の輪郭の形状に実質的に沿っていること
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
[Scope of Claims] 1) A shadow mask structure consisting of a fluorescent screen, a shadow mask with a large number of through holes arranged close to the fluorescent screen, and a mask frame, and a shadow mask structure supported by the shadow mask structure. In a color picture tube comprising at least a magnetic shield for shielding an external magnetic field and an electron gun for emitting an electron beam that causes phosphors of the screen to selectively emit light through the shadow mask structure, at least the magnetic shield A color picture tube, wherein the opening end is located between the shadow mask structure and the electron gun and substantially follows the shape of the outline of the scanning area of the electron beam in a cross section perpendicular to the tube axis. . 2) The color picture tube according to claim 1, wherein the curved state of each side wall surface of the magnetic shield is substantially parabolic. 3) The color picture tube according to claim 1, wherein only the open end of the magnetic shield on the electron gun side substantially follows the contour of the scanning area of the electron beam.
JP24846286A 1986-10-21 1986-10-21 Color picture tube Pending JPS63105436A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP24846286A JPS63105436A (en) 1986-10-21 1986-10-21 Color picture tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP24846286A JPS63105436A (en) 1986-10-21 1986-10-21 Color picture tube

Publications (1)

Publication Number Publication Date
JPS63105436A true JPS63105436A (en) 1988-05-10

Family

ID=17178495

Family Applications (1)

Application Number Title Priority Date Filing Date
JP24846286A Pending JPS63105436A (en) 1986-10-21 1986-10-21 Color picture tube

Country Status (1)

Country Link
JP (1) JPS63105436A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100426566B1 (en) * 2001-08-08 2004-04-08 엘지.필립스디스플레이(주) Color Cathode-ray Tube Containing Improved Inner Shield

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS48104462A (en) * 1972-04-14 1973-12-27
JPS4933751B1 (en) * 1969-04-21 1974-09-09

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4933751B1 (en) * 1969-04-21 1974-09-09
JPS48104462A (en) * 1972-04-14 1973-12-27

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100426566B1 (en) * 2001-08-08 2004-04-08 엘지.필립스디스플레이(주) Color Cathode-ray Tube Containing Improved Inner Shield

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