JPH0752631B2 - Cathode ray tube device - Google Patents

Cathode ray tube device

Info

Publication number
JPH0752631B2
JPH0752631B2 JP1146979A JP14697989A JPH0752631B2 JP H0752631 B2 JPH0752631 B2 JP H0752631B2 JP 1146979 A JP1146979 A JP 1146979A JP 14697989 A JP14697989 A JP 14697989A JP H0752631 B2 JPH0752631 B2 JP H0752631B2
Authority
JP
Japan
Prior art keywords
horizontal deflection
coil
magnetic field
cathode ray
deflection
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.)
Expired - Fee Related
Application number
JP1146979A
Other languages
Japanese (ja)
Other versions
JPH0311531A (en
Inventor
昌広 横田
英男 森
清志 大山
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 JP1146979A priority Critical patent/JPH0752631B2/en
Priority to EP90110822A priority patent/EP0401831B1/en
Priority to DE69028146T priority patent/DE69028146T2/en
Priority to KR1019900008588A priority patent/KR920010657B1/en
Publication of JPH0311531A publication Critical patent/JPH0311531A/en
Priority to US07/888,281 priority patent/US5189348A/en
Publication of JPH0752631B2 publication Critical patent/JPH0752631B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/02Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/003Arrangements for eliminating unwanted electromagnetic effects, e.g. demagnetisation arrangements, shielding coils
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00Details of cathode ray tubes or electron beam tubes
    • H01J2229/0007Elimination of unwanted or stray electromagnetic effects
    • H01J2229/0015Preventing or cancelling fields leaving the enclosure

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)

Description

【発明の詳細な説明】 [発明の目的] (産業上の利用分野) この発明は、陰極線管装置に係り、特に偏向ヨークの水
平偏向コイルから発生する漏洩磁場を軽減するようにし
た陰極線管装置に関する。
The present invention relates to a cathode ray tube device, and more particularly to a cathode ray tube device for reducing a leakage magnetic field generated from a horizontal deflection coil of a deflection yoke. Regarding

(従来の技術) VDU(Visual Display Unit)の普及にともなって、VDU
の漏洩磁場が人体に与える影響に関して議論が高まって
きている。現在のところ、その信憑性および因果関係に
ついては結論が出ていないが、北欧を中心として、取敢
えず勧告を出して注意を喚起しようという動きがある。
(Conventional technology) With the spread of VDU (Visual Display Unit), VDU
There is increasing debate about the effects of the stray magnetic field on humans. At present, no conclusions have been reached regarding its credibility and causal relationship, but there is a movement centering on Northern Europe to make recommendations and call attention.

たとえばスウェーデンの国家度量衡試験審議会(Natina
l Council for Metrology and Testing)では、そのVDU
の試験評価法に関するガイドライン(MPR−P 1988)の
中で、VDUを中心とした半径65cm(管軸上では管面より5
0cm前方)の球面上での漏洩磁場(主として水平偏向漏
洩磁場)が、磁束密度B≦50nT、誘導磁束密度dB/dt≦2
5mT/sであることを推奨値としてあげている。
For example, the Swedish National Metrology Board (Natina
l Council for Metrology and Testing)
In the guideline (MPR-P 1988) on the test evaluation method of the
The leakage magnetic field (mainly the horizontal deflection leakage magnetic field) on the spherical surface (0 cm ahead) is magnetic flux density B ≦ 50 nT, induced magnetic flux density dB / dt ≦ 2.
The recommended value is 5 mT / s.

このVDUの漏洩磁場の主な発生源は、陰極線管に装着さ
れた偏向ヨークの水平偏向コイルである。通常偏向ヨー
クは、磁芯と水平偏向コイルおよび垂直偏向コイルを備
え、第4図に示すように、たとえばサドル型に巻回され
た水平偏向コイル(1)からは、破線で示す磁場が発生
する。この水平偏向の漏洩磁束は、主偏向磁束Baと水平
偏向コイル(1)の渡り線部(2)から発生する偏向磁
束Bbとに大別される。これら偏向磁束Ba,Bbの向きは互
いに相反し、特に偏向ヨーク(3)近傍の漏洩磁場は複
雑であるが、VDU中心から約45cm離れた垂直面(管軸に
垂直な面)上での分布は、第5図(a)に矢印(4)で
示すように単純であり、同(b)に矢印(5)で示すよ
うにVDUの中心に主偏向磁束Baとは逆向きの磁束を発生
するコイル(6)を配置したときの分布に近い。
The main source of the leakage magnetic field of this VDU is the horizontal deflection coil of the deflection yoke mounted on the cathode ray tube. The normal deflection yoke includes a magnetic core, a horizontal deflection coil, and a vertical deflection coil. As shown in FIG. 4, a horizontal deflection coil (1) wound in a saddle shape, for example, produces a magnetic field indicated by a broken line. . The leakage magnetic flux of the horizontal deflection is roughly classified into a main deflection magnetic flux Ba and a deflection magnetic flux Bb generated from the crossover portion (2) of the horizontal deflection coil (1). The directions of these deflection magnetic fluxes Ba and Bb are opposite to each other, and especially the leakage magnetic field near the deflection yoke (3) is complicated, but the distribution on the vertical plane (plane perpendicular to the tube axis) about 45 cm away from the VDU center. Is simple as shown by arrow (4) in FIG. 5 (a), and generates a magnetic flux in the direction opposite to the main deflection magnetic flux Ba at the center of VDU as shown by arrow (5) in FIG. 5 (b). The distribution is close to that when the coil (6) is arranged.

このような水平偏向漏洩磁場を打消すために、第6図に
示すように、管軸(z軸)を通る水平面を挟んで、漏洩
磁場の中心(o)を通る管軸に垂直な平面(7)近傍の
上下に1組の補償コイル対(8)を配置し、この補償コ
イル対(8)にそこを通る漏洩磁束Bbを打消す磁束(主
偏向磁束Baと同じ向きになる方向の磁束)を発生するよ
うに水平偏向電流を流すようにした陰極線管装置(9)
がある。
In order to cancel such a horizontal deflection leakage magnetic field, as shown in FIG. 6, a plane perpendicular to the tube axis passing through the center (o) of the leakage magnetic field is sandwiched between horizontal planes passing through the tube axis (z axis). 7) A pair of compensating coil pair (8) is arranged above and below the vicinity, and a magnetic flux that cancels the leakage magnetic flux Bb passing therethrough in this compensating coil pair (8) (a magnetic flux in the same direction as the main deflection magnetic flux Ba). ). A cathode ray tube device in which a horizontal deflection current is caused to flow (9)
There is.

しかし、この従来の陰極線管装置(9)は、陰極線管
(カラーブラウン管)内側に補償コイル対(8)に接近
して設けられている内部磁気シールド、シャドウマス
ク、ダグ塗布膜などの影響により、第7図に示すよう
に、、補償コイル対から発生する磁束の波形(10)と漏
洩磁束の波形(11)とに位相差ΔΦ(時間的なずれ)が
生じ、漏洩磁束を十分に補償することができない。ま
た、水平偏向電流を補償コイル対に流すために、偏向回
路のインピーダンスが増加し、偏向パワーの損失が増大
する。さらにまた、補償コイル対の配置位置が漏斗状コ
ーン部の中央部の傾斜した外面となるため、その取付け
が不安定で位置調節が容易でないなどの問題がある。
However, this conventional cathode ray tube device (9) is affected by an internal magnetic shield, a shadow mask, a doug coating film, etc., provided inside the cathode ray tube (color cathode ray tube) close to the compensating coil pair (8). As shown in FIG. 7, a phase difference ΔΦ (time shift) occurs between the waveform (10) of the magnetic flux generated from the compensating coil pair and the waveform (11) of the leakage magnetic flux, and the leakage magnetic flux is sufficiently compensated. I can't. Further, since the horizontal deflection current is passed through the pair of compensation coils, the impedance of the deflection circuit is increased and the loss of deflection power is increased. Furthermore, since the position where the compensating coil pair is arranged is the inclined outer surface of the central portion of the funnel-shaped cone portion, there is a problem that the attachment is unstable and the position adjustment is not easy.

(発明が解決しようとする課題) 上記のように、従来の水平偏向漏洩磁場を打消すように
構成された陰極線管装置は、管軸を通る水平面を挟んで
漏洩磁場の中心上近傍に1組の補償コイル対を配置する
構造であるため、陰極線管内側に設けられた内部磁気シ
ールドやシャドウマスク、ダグ塗布膜などの影響によ
り、補償コイル対から発生する磁束の波形と漏洩磁束の
波形とに位相差が生じ、漏洩磁束を十分に軽減すること
ができない。また、補償コイル対に水平偏向電流を流す
ため、偏向回路のインピーダンスが増加し、偏向パワー
の損失が増大する。さらに、補償コイル対の取付けが不
安定となり、位置調節が容易でないなどの問題がある。
(Problems to be Solved by the Invention) As described above, the conventional cathode ray tube device configured to cancel the horizontal deflection leakage magnetic field has one set near the center of the leakage magnetic field with the horizontal plane passing through the tube axis interposed therebetween. Since the compensating coil pair is arranged, the waveform of the magnetic flux generated from the compensating coil pair and the waveform of the leakage magnetic flux are affected by the influence of the internal magnetic shield, shadow mask, doug coating film, etc. provided inside the cathode ray tube. A phase difference occurs and the leakage magnetic flux cannot be reduced sufficiently. Further, since the horizontal deflection current is passed through the pair of compensation coils, the impedance of the deflection circuit is increased and the loss of deflection power is increased. Furthermore, there is a problem that the mounting of the compensating coil pair becomes unstable and the position adjustment is not easy.

この発明は、上記問題点を解決するためになされたもの
であり、VDUを中心とした半径65cmの球面上での漏洩磁
場の補償を十分におこない、かつ管面前方の漏洩磁場を
重点的に軽減する対策を容易にし、さらに、補償コイル
対による偏向パワーの損失を少なくする陰極線管装置を
構成することを目的とする。
The present invention has been made to solve the above problems, and sufficiently compensates for the leakage magnetic field on a spherical surface with a radius of 65 cm centered on the VDU, and focuses on the leakage magnetic field in front of the tube surface. It is an object of the present invention to configure a cathode ray tube device that facilitates measures for mitigation and further reduces loss of deflection power due to a compensation coil pair.

[発明の構成] (課題を解決するための手段) 外囲器外側に少なくとも磁芯およびサドル型水平偏向コ
イルを有する偏向ヨークが装着された陰極線管装置にお
いて、管軸を通る水平面を挟んで対峙し、上記水平偏向
コイルに流れる水平偏向電流に比例した電流の通電によ
り、上記水平偏向コイルから発生する水平偏向漏洩磁場
を軽減する補償磁場を発生する補償コイル対を複数組の
補償コイル対で構成し、この複数組の補償コイル対を上
記水平偏向漏洩磁場の中心を通る管軸に垂直な平面の両
側にそれぞれ少なくとも1組づつ配置する構成とした。
[Means for Solving the Problems] (Means for Solving the Problems) In a cathode ray tube device in which a deflection yoke having at least a magnetic core and a saddle-type horizontal deflection coil is mounted on the outside of an envelope, a horizontal plane passing through the tube axis is sandwiched between them. However, a compensation coil pair that generates a compensation magnetic field that reduces the horizontal deflection leakage magnetic field generated from the horizontal deflection coil by energizing a current proportional to the horizontal deflection current flowing in the horizontal deflection coil is configured by a plurality of compensation coil pairs. At least one pair of compensation coil pairs is arranged on each side of a plane perpendicular to the tube axis passing through the center of the horizontal deflection leakage magnetic field.

より具体的には、その水平偏向漏洩磁場の中心を通る管
軸に垂直な平面の一側に配置される補償コイル対をパネ
ルの外側面上またはこのパネルと一体のファンネルの内
側に配設された内部磁気シールドを挟むファンネルの外
側面上に配置する構成とした。
More specifically, a compensating coil pair arranged on one side of a plane perpendicular to the tube axis passing through the center of the horizontal deflection leakage magnetic field is arranged on the outer surface of the panel or inside the funnel integrated with this panel. In addition, it is arranged on the outer surface of the funnel that sandwiches the inner magnetic shield.

また、水平偏向漏洩磁場の中心を通る管軸に垂直な平面
の他側に配置される補償コイル対を偏向ヨークの磁芯上
に配置する構成とした。
Further, the compensating coil pair arranged on the other side of the plane perpendicular to the tube axis passing through the center of the horizontal deflection leakage magnetic field is arranged on the magnetic core of the deflection yoke.

(作 用) 上記のように、水平偏向漏洩磁場を軽減する補償磁場を
発生する補償コイル対を複数組の補償コイル対で構成
し、この複数組の補償コイル対を水平偏向漏洩磁場の中
心を通る管軸に垂直な平面の両側にそれぞれ少なくとも
1組づつ配置すると、その一側に配置される補償コイル
対により、管面前方における水平偏向漏洩磁束との位相
差を少なくして、水平偏向漏洩磁場を効果的に補償する
することができる。また、他側に補償コイル対をバラン
スよく配置することにより、管面前方以外の水平偏向漏
洩磁場も、従来の1組の補償コイル対を配置した陰極線
管装置と同様に補償することができる。
(Operation) As described above, the compensating coil pair that generates the compensating magnetic field that reduces the horizontal deflection leakage magnetic field is composed of a plurality of pairs of compensating coil pairs. If at least one pair is arranged on each side of a plane perpendicular to the tube axis passing through, the compensation coil pair arranged on that side reduces the phase difference from the horizontal deflection leakage magnetic flux in the front of the tube surface, and the horizontal deflection leakage. The magnetic field can be effectively compensated. Further, by arranging the compensating coil pair on the other side in a well-balanced manner, the horizontal deflection leakage magnetic field other than the front of the tube surface can be compensated similarly to the conventional cathode ray tube device in which one compensating coil pair is arranged.

(実施例) 以下、図面を参照してこの発明を実施例に基づいて説明
する。
(Embodiment) Hereinafter, the present invention will be described based on an embodiment with reference to the drawings.

第1図にその一実施例であるカラー陰極線管装置を示
す。この陰極線管装置は、カラーブラウン管(20)と、
その外囲器外側に装着された偏向ヨーク(21)と、同じ
くその外囲器外側に装着された補償コイル対(22)とか
らなる。
FIG. 1 shows a color cathode ray tube device which is one of the embodiments. This cathode ray tube device includes a color cathode ray tube (20),
The deflection yoke (21) is mounted on the outside of the envelope, and the compensation coil pair (22) is also mounted on the outside of the envelope.

上記カラーブラウン管(20)は、周縁部にスカート部
(24)が形成されたパネル(25)とこのパネル(25)に
一体に接合された漏斗状のファンネル(26)とから外囲
器(27)を有し、そのパネル(25)の内面に、青、緑、
赤に発光する3色蛍光体層からなる蛍光面(28)が形成
されている。そして、この蛍光面(28)に接近して、パ
ネル(25)の内側にシャドウマスク(29)が装着されて
いる。このシャドウマスク(29)は、多数の電子ビーム
通過孔が形成され、上記蛍光面(25)と対向するマスク
本体(30)とその周辺部を支持するマスクフレーム(3
1)とからなり、いずれも低炭素鋼などの磁性材料で形
成されている。このシャドウマスク(29)のマスクフレ
ーム(31)には、同じく磁性材料からなる筒状の内部磁
気シールド(33)が取付けられ、上記ファンネル(26)
のコーン部(34)内側に延在している。また、ファンネ
ル(26)のネック(35)内には、3電子ビームを放出す
る電子銃(36)が配設されている。さらに、ファンネル
(26)のコーン部(34)内面からネック(35)内面の隣
接部にかけて内面ダグ塗布膜(37)が、またコーン部
(34)の外面には外面ダグ塗布膜(38)が塗布形成され
ている。
The color cathode ray tube (20) includes a panel (25) having a skirt portion (24) formed on a peripheral portion thereof, and a funnel-shaped funnel (26) integrally joined to the panel (25) to provide an envelope (27). ), On the inner surface of its panel (25), blue, green,
A phosphor screen (28) formed of a three-color phosphor layer that emits red light is formed. A shadow mask (29) is attached to the inside of the panel (25) so as to approach the fluorescent screen (28). The shadow mask (29) has a large number of electron beam passage holes formed therein, and a mask frame (3) that supports the mask body (30) facing the phosphor screen (25) and its peripheral portion.
1) and consist of magnetic materials such as low carbon steel. A cylindrical inner magnetic shield (33) also made of a magnetic material is attached to the mask frame (31) of the shadow mask (29), and the funnel (26) is formed.
It extends inside the cone (34). An electron gun (36) that emits three electron beams is arranged in the neck (35) of the funnel (26). Furthermore, the inner surface doug coating film (37) extends from the inner surface of the cone portion (34) of the funnel (26) to the adjacent portion of the inner surface of the neck (35), and the outer surface doug coating film (38) forms on the outer surface of the cone portion (34). It is formed by coating.

なお、(39)はパネル(26)のスカート部(25)を緊締
する防爆バンド、(40)はファンネル(26)のコーン部
(34)に設けられた陽極端子である。
Reference numeral (39) is an explosion-proof band for tightening the skirt portion (25) of the panel (26), and (40) is an anode terminal provided on the cone portion (34) of the funnel (26).

偏向ヨーク(21)は、上記ファンネル(27)のコーン部
(34)とネック(35)との境界部外側に装着され、上記
電子銃(36)から放出される3電子ビームを水平方向に
偏向する水平偏向コイル、垂直方向に偏向する垂直偏向
コイルおよび磁芯を備える。特にこの例の陰極線管装置
の偏向ヨーク(21)は、少なくともサドル型に巻回され
た水平偏向コイルと磁芯とを備える。
The deflection yoke (21) is attached to the outside of the boundary between the cone portion (34) and the neck (35) of the funnel (27) and horizontally deflects the three electron beams emitted from the electron gun (36). A horizontal deflection coil, a vertical deflection coil for vertically deflecting, and a magnetic core. In particular, the deflection yoke (21) of the cathode ray tube device of this example includes at least a horizontal deflection coil wound in a saddle type and a magnetic core.

補償コイル対(22)は、カラーブラウン管(20)の管軸
(z軸)を通る水平面を挟んで対峙する2個のコイル
(42a),(42b)から構成され、この例の陰極線管装置
では、その各コイル(42a),(42b)がそれぞれ2組
(複数組)の補償コイル対(22a),(22b)からなる。
この2組の補償コイル対(22a),(22b)は、上記偏向
ヨーク(21)の水平偏向コイルが発生する水平偏向漏洩
磁場の中心を通る管軸に垂直な平面(7)の両側に配置
され、その一方の補償コイル対(22a)は、内側にシャ
ドウマスク(29)が位置するパネル(25)のスカート部
(24)の外面上、または内側に内部磁気シールド(33)
が位置するファンネル(26)のコーン部(34)の外面上
に、たとえば接着剤により取付けられている。特にパネ
ル(25)のスカート部(24)上の場合は、このスカート
部(24)を緊締する防爆バンド(39)を利用して容易に
取付けることができる。また、他方の補償コイル対(22
b)は、偏向ヨーク(21)の磁芯上に配置されている。
そして、これら補償コイル対(22a),(22b)は、偏向
ヨーク(21)の水平偏向コイルに直列または並列に接続
されて水平偏向電流に比例した電流を流すか、または水
平偏向コイルとは独立に水平偏向電流に比例かつ同じ時
間変化をする電流を流すように駆動回路に接続されてい
る。
The compensating coil pair (22) is composed of two coils (42a) and (42b) facing each other across a horizontal plane passing through the tube axis (z axis) of the color CRT (20), and in the cathode ray tube device of this example. , Each of the coils (42a) and (42b) is composed of two pairs (a plurality of pairs) of compensation coil pairs (22a) and (22b).
The two pairs of compensation coils (22a) and (22b) are arranged on both sides of a plane (7) perpendicular to the tube axis passing through the center of the horizontal deflection leakage magnetic field generated by the horizontal deflection coil of the deflection yoke (21). One of the pair of compensation coils (22a) is provided on the inner surface of the skirt portion (24) of the panel (25) in which the shadow mask (29) is located, or on the inner surface of the inner magnetic shield (33).
Is attached to the outer surface of the cone portion (34) of the funnel (26) where is located by, for example, an adhesive. Especially when it is on the skirt portion (24) of the panel (25), it can be easily attached by using the explosion-proof band (39) for tightening the skirt portion (24). Also, the other compensation coil pair (22
b) is arranged on the magnetic core of the deflection yoke (21).
The pair of compensation coils (22a) and (22b) are connected in series or in parallel with the horizontal deflection coil of the deflection yoke (21) to flow a current proportional to the horizontal deflection current, or independently of the horizontal deflection coil. Is connected to the drive circuit so that a current that is proportional to the horizontal deflection current and changes with the same time flows.

ところで、上記のように補償コイル対(22a),(22B)
を配置すると、下記のようにきわめて良好な漏洩磁場特
性が得られる。
By the way, as described above, the compensation coil pair (22a), (22B)
By arranging, a very good leakage magnetic field characteristic can be obtained as described below.

(イ) 各補償コイル対(22a),(22b)の取付け位置
や各コイル対(22a),(22b)に流す電流を調整するこ
とにより、パネル(25)前方以外の漏洩磁場を有効に補
償することができる。すなわち、第2図は、VDUの試験
評価法により、カラーブラウン管(20)のパネル(26)
外面より15mm内側の点(VDUの中心)から65mm離れた垂
直面上での補償磁場を示したものであるが、矢印(44)
で示すように、水平偏向漏洩磁場の中心上に1組の補償
コイル対を配置した従来の陰極線管装置と同等の補償磁
場が得られる。
(B) By adjusting the mounting position of each compensating coil pair (22a), (22b) and the current flowing through each coil pair (22a), (22b), the leakage magnetic field other than the front of the panel (25) is effectively compensated. can do. That is, Fig. 2 shows the panel (26) of the color cathode ray tube (20) according to the test evaluation method of VDU.
It shows the compensating magnetic field on the vertical plane 65 mm away from the point 15 mm inside from the outer surface (center of the VDU). Arrow (44)
As shown in, a compensation magnetic field equivalent to that of the conventional cathode ray tube device in which one compensation coil pair is arranged on the center of the horizontal deflection leakage magnetic field is obtained.

(ロ) 従来の陰極線管装置では、第7図に示したよう
に水平偏向漏洩磁束と補償磁束との位相差のために、漏
洩磁束を十分に補償することができなかったが、上記の
ように補償コイル対(22a),(22b)を配置すると、一
方の補償コイル対(22a)の近くにはシャドウマスク(2
9)や内部磁気シールド(33)などの磁性材料が、また
他方の補償コイル対(22b)の近くには偏向ヨーク(2
1)の磁芯が存在するため、偏向ヨーク(21)から発生
する水平偏向漏洩磁場と位相差の少ない補償磁場を発生
させることができ、漏洩磁場を有効に補償することがで
きる。
(B) In the conventional cathode ray tube device, the leakage magnetic flux could not be sufficiently compensated due to the phase difference between the horizontal deflection leakage magnetic flux and the compensation magnetic flux as shown in FIG. When the compensating coil pair (22a) and (22b) are arranged in the shadow coil (2a), a shadow mask (2
9) or the magnetic material such as the inner magnetic shield (33), and the deflection yoke (2) near the other compensating coil pair (22b).
Since the magnetic core of 1) exists, it is possible to generate a compensation magnetic field having a small phase difference from the horizontal deflection leakage magnetic field generated from the deflection yoke (21), and it is possible to effectively compensate the leakage magnetic field.

(ハ) 上記のように2組の補償コイル対(22a),(2
2b)を配置し、それらに水平偏向電流に比例した電流を
流すようにすると、偏向ヨーク(21)の偏向パワーの損
失を軽減できる。すなわち、一般に偏向パワーは、偏向
コイルのインピーダンスZに依存し、コイルの抵抗を
R、インタクダンスをLとすると、 で表される。したがって、偏向パワーを低減するために
は、偏向に寄与しない補償コイルのインダクタンスを下
げるとよい。ところで、補償コイルの場合、 R<<2πfL であり、コイルの巻数をN、磁束の強度をΦとすると、 L=NΦ/I∝N2 であるので、偏向パワーは、各コイルの巻数Nの2乗に
比例して大きくなる。一方、複数組の補償コイルから発
生する補償磁束の強度は、各対をなすコイルの巻数Nの
総和に比例する。
(C) As described above, two pairs of compensation coils (22a), (2
2b) is arranged and a current proportional to the horizontal deflection current is passed through them, the loss of the deflection power of the deflection yoke (21) can be reduced. That is, in general, the deflection power depends on the impedance Z of the deflection coil, where R is the resistance of the coil and L is the inductance. It is represented by. Therefore, in order to reduce the deflection power, it is preferable to reduce the inductance of the compensation coil that does not contribute to the deflection. By the way, in the case of the compensation coil, R << 2πfL, and if the number of turns of the coil is N and the intensity of the magnetic flux is Φ, then L = NΦ / I∝N 2 , so the deflection power is the number of turns N of each coil. It increases in proportion to the square. On the other hand, the intensity of the compensating magnetic flux generated from the plurality of sets of compensating coils is proportional to the total number of turns N of each pair of coils.

したがって、この例の陰極線管装置のように2組の補償
コイル対(22a),(22b)を用いると、従来の1組の補
償コイル対にくらべ、巻数Nの総和はほぼ同じにしても
Lが減少し、1組の補償コイル対と同じ強度の補償磁束
でトータルのインダクタンスが減少し、補償コイル対
(22a),(22b)のパワー損失を軽減でき、したがっ
て、偏向パワーの損失を軽減できる。
Therefore, when two sets of compensation coil pairs (22a) and (22b) are used as in the cathode ray tube apparatus of this example, even if the total number of turns N is approximately the same as in the conventional one pair of compensation coils, L Is reduced, the total inductance is reduced by the compensation magnetic flux having the same strength as that of the pair of compensation coils, and the power loss of the compensation coil pairs (22a) and (22b) can be reduced, and therefore, the loss of the deflection power can be reduced. .

(ニ) 水平偏向漏洩磁場の中心上に1組の補償コイル
対を配置した従来の陰極線管装置では、第3図(b)に
示すように、電子ビームの通過領域に偏向ヨーク(21)
の水平偏向コイルから発生する主偏向磁束(45)と同方
向の補償磁束(46)を発生するため、電子ビームの偏向
が増大し、蛍光面の3色蛍光体層に対するランディング
が外側にずれる。
(D) In the conventional cathode ray tube device in which one pair of compensation coils is arranged on the center of the horizontal deflection leakage magnetic field, as shown in FIG. 3 (b), the deflection yoke (21) is provided in the electron beam passage region.
Since the main deflection magnetic flux (45) generated from the horizontal deflection coil is generated in the same direction as the compensation magnetic flux (46), the deflection of the electron beam is increased, and the landing of the phosphor screen with respect to the three-color phosphor layer is shifted to the outside.

しかし、同(a)に示すように、水平偏向漏洩磁場の中
心を通る管軸に垂直な平面の両側に2組の補償コイル対
(22a),(22b)を配置すると、その一側に配置された
補償コイル対(22a)は、電子ビームの通過領域に偏向
ヨーク(21)の水平偏向コイルから発生する主偏向磁束
(45)と同方向の補償磁束(46a)を発生するが、他側
に配置された補償コイル対(22b)は、逆方向の補償磁
束(46b)を発生するので、電子ビームの通過領域にお
ける補償磁場の総和をほぼ零にすることができ、ランデ
ィングずれをおこしにくくすることができる。
However, as shown in (a), when two compensating coil pairs (22a) and (22b) are arranged on both sides of a plane perpendicular to the tube axis passing through the center of the horizontal deflection leakage magnetic field, they are arranged on one side. The paired compensation coil (22a) generates a compensation magnetic flux (46a) in the same direction as the main deflection magnetic flux (45) generated from the horizontal deflection coil of the deflection yoke (21) in the electron beam passage region, but the other side. Since the compensating coil pair (22b) arranged at generates the compensating magnetic flux (46b) in the opposite direction, the total sum of the compensating magnetic fields in the electron beam passage region can be made almost zero, and the landing deviation is less likely to occur. be able to.

(ホ) 補償コイル対を2組とすると、その取付け位置
の自由度が増し、比較的簡単に補償コイル対(22a),
(22b)を配置することができる。
(E) If there are two compensating coil pairs, the degree of freedom of the mounting position increases, and the compensating coil pair (22a),
(22b) can be placed.

表1に2組の補償コイル対(22a),(22b)を配置した
この例の陰極線管装置と1組の補償コイル対(8)を配
置した従来の陰極線管装置の具体例を示す。
Table 1 shows specific examples of the cathode ray tube device of this example in which two pairs of compensation coils (22a) and (22b) are arranged and the conventional cathode ray tube device in which one pair of compensation coil pairs (8) is arranged.

表2は、上記表1の各陰極線管装置および補償コイル対
をもたない陰極線管装置の特性を比較して示したもので
ある。この表2には、誘導磁束密度dB/dtおよび磁束密
度Bとして、パネル前方30cmの距離における値と、VDU
による65cmの球面上かつ水平面に対する角度θが −45゜≦θ≦45゜ の範囲内の最大値を示した。また、水平偏向系のインダ
クタンス増は、水平偏向コイルに補償コイル対を直列に
接続する前後の増加を%で示したものである。
Table 2 shows a comparison of the characteristics of each cathode ray tube device of Table 1 and the cathode ray tube device having no compensating coil pair. Table 2 shows the induction magnetic flux density dB / dt and the magnetic flux density B at the distance 30 cm in front of the panel and VDU.
Shows the maximum angle θ on the spherical surface of 65 cm with respect to the horizontal plane within the range of −45 ° ≦ θ ≦ 45 °. The increase in the inductance of the horizontal deflection system is the increase in% before and after connecting the pair of compensation coils in series to the horizontal deflection coil.

この表2に示されているように、従来の1組の補償コイ
ル対の場合は、パネル前方30cmでの誘導磁束密度dB/dt
が13mT/s、VDUによる65cmの球面上での誘導磁束密度dB/
dtが9mT/s、インダクタンス増分9.3%が限度であるが、
実施例のように2組の補償コイル対を用い、水平偏向漏
洩磁場の中心を通る管軸に垂直な平面に対してその1組
をファンネルのパネル隣接部上(前方)に、他の1組を
偏向ヨークの磁芯上(後方)に配置すると、パネル前方
30cmでの誘導磁束密度dB/dtを6mT/s、インダクタンス増
分を7.8%に押えることができる。
As shown in Table 2, in the case of a conventional pair of compensation coils, the induced magnetic flux density dB / dt 30 cm in front of the panel.
Is 13 mT / s, induced magnetic flux density dB / on a 65 cm spherical surface by VDU
Although dt is 9mT / s and the inductance increment is 9.3%,
As in the embodiment, two pairs of compensation coils are used, and one pair is placed on the panel adjacent to the funnel (forward) with respect to a plane perpendicular to the tube axis passing through the center of the horizontal deflection leakage magnetic field, and the other pair. Is placed on the magnetic core of the deflection yoke (rear),
It is possible to suppress the induced magnetic flux density dB / dt at 30 cm to 6 mT / s and the inductance increment to 7.8%.

[発明の効果] 少なくとも磁芯およびサドル型水平偏向コイルを有する
偏向ヨークが装着された陰極線管装置において、上記水
平偏向コイルから発生する水平偏向漏洩磁場の中心を通
る管軸に垂直な平面の両側に、水平偏向電流に比例した
電流の通電により水平偏向漏洩磁場を軽減する補償磁場
を発生する補償コイル対を少なくとも1組づつ配置する
と、VDUによる漏洩磁場を十分に補償することができ、V
DUを操作する管前方の漏洩磁場を重点的に軽減する対策
を容易におこなうことができる陰極線管装置とすること
ができる。
[Advantages of the Invention] In a cathode ray tube device equipped with a deflection yoke having at least a magnetic core and a saddle type horizontal deflection coil, both sides of a plane perpendicular to the tube axis passing through the center of the horizontal deflection leakage magnetic field generated from the horizontal deflection coil. In addition, by arranging at least one pair of compensating coils that generate a compensating magnetic field that reduces the horizontal deflecting leakage magnetic field by passing a current proportional to the horizontal deflection current, it is possible to sufficiently compensate the leakage magnetic field due to VDU.
It is possible to provide a cathode ray tube device that can easily take measures to reduce the leakage magnetic field in front of the tube that operates the DU.

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

第1図乃至第3図はこの発明の実施例の説明図で、第1
図(a)および(b)はその一実施例であるカラー陰極
線管装置の構成を示す図、第2図はVDU中心から65cm離
れた垂直面上での補償磁場を示す図、第3図(a)およ
び(b)はそれぞれ2組の補償コイル対を配置した実施
例の陰極線管装置のランディングへの影響を説明するた
めの図および比較のために示した2組の補償コイル対を
配置した陰極線管装置のランディングへの影響を説明す
るための図、第4図は偏向ヨークのサドル型水平偏向コ
イルから発生する水平偏向漏洩磁場の図、第5図(a)
および(b)はそれぞれVDU中心から65cm離れた垂直面
上での水平偏向漏洩磁束の分布図およびVDU中心に水平
偏向コイルが発生する主偏向磁束とは逆向きの磁束を発
生するコイルを配置したときの磁束の分布図、第6図
(a)および(b)は漏洩磁場の中心を通る管軸に垂直
な平面近傍の上下に1組の補償コイル対を配置した従来
の陰極線管装置の図、第7図は補償コイルから発生する
磁束の波形と漏洩磁束の波形との関係を示す図である。 20……カラーブラウン管 21……偏向ヨーク、22……補償コイル対 25……パネル、26……ファンネル 27……外囲器、29……シャドウマスク 37……内面ダグ塗布膜、38……外面ダグ塗布膜 39……防爆バンド、42a,42b……コイル
1 to 3 are explanatory views of an embodiment of the present invention.
FIGS. (A) and (b) are diagrams showing a configuration of a color cathode ray tube device which is one example thereof, FIG. 2 is a diagram showing a compensating magnetic field on a vertical plane 65 cm away from the center of the VDU, and FIG. 3 ( (a) and (b) are the figures for explaining the influence on the landing of the cathode ray tube apparatus of the embodiment in which two sets of compensation coil pairs are arranged, and the two pairs of compensation coil pairs shown for comparison are arranged. FIG. 4 is a diagram for explaining the influence on the landing of the cathode ray tube device, FIG. 4 is a diagram of a horizontal deflection leakage magnetic field generated from the saddle type horizontal deflection coil of the deflection yoke, and FIG. 5 (a).
(B) shows the distribution diagram of the horizontal deflection leakage magnetic flux on the vertical plane 65 cm away from the VDU center, and the coil that generates the magnetic flux in the direction opposite to the main deflection magnetic flux generated by the horizontal deflection coil is arranged at the VDU center. FIG. 6 (a) and FIG. 6 (b) are diagrams of a conventional cathode ray tube device in which a pair of compensating coil is arranged above and below a plane perpendicular to the tube axis passing through the center of the leakage magnetic field. , FIG. 7 is a diagram showing the relationship between the waveform of the magnetic flux generated from the compensation coil and the waveform of the leakage magnetic flux. 20 …… Color cathode ray tube 21 …… Deflecting yoke, 22 …… Compensation coil pair 25 …… Panel, 26 …… Funnel 27 …… Envelope, 29 …… Shadow mask 37 …… Inner surface doug coating film, 38 …… Outer surface Doug coating film 39 ... Explosion-proof band, 42a, 42b ... Coil

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】外囲器の外側に装着され、少なくとも磁芯
およびサドル型水平偏向コイルを有する偏向ヨークと、
管軸を通る水平面を挟んで対峙し、上記水平偏向コイル
に流れる水平偏向電流に比例した電流の通電により上記
水平偏向コイルから発生する水平偏向漏洩磁場を軽減す
る補償磁場を発生する補償コイル対とを具備し、 上記補償コイル対は複数組の補償コイル対からなり、こ
の複数組の補償コイル対が上記水平偏向漏洩磁場の中心
を通る管軸に垂直な平面の両側に少なくとも1組づつ配
置されていることを特徴とする陰極線管装置。
1. A deflection yoke mounted on the outside of an envelope and having at least a magnetic core and a saddle-type horizontal deflection coil,
A pair of compensating coils that face each other across a horizontal plane passing through the tube axis and generate a compensating magnetic field that reduces a horizontal deflection leakage magnetic field generated from the horizontal deflection coil by passing a current proportional to the horizontal deflection current flowing in the horizontal deflection coil. The pair of compensation coils comprises a plurality of pairs of compensation coils, and the plurality of pairs of compensation coils are arranged at least one on each side of a plane perpendicular to the tube axis passing through the center of the horizontal deflection leakage magnetic field. A cathode ray tube device characterized in that
【請求項2】内面に蛍光体スクリーンが形成されたパネ
ルおよびこのパネルと一体のファンネルからなる外囲器
を有し、かつ上記ファンネルの内側に内部磁気シールド
が配置され、複数組の補償コイル対のうち水平偏向漏洩
磁場の中心を通る管軸に垂直な平面の一側に配置される
補償コイル対が上記パネルの外側面上または上記内部磁
気シールドを挟んで上記ファンネルの外側面上に配置さ
れることを特徴とする請求項1記載の陰極線管装置。
2. A compensating coil pair having a panel having a phosphor screen formed on an inner surface thereof and an envelope made of a funnel integrated with the panel, wherein an inner magnetic shield is arranged inside the funnel. A compensating coil pair arranged on one side of a plane perpendicular to the tube axis passing through the center of the horizontal deflection leakage magnetic field is arranged on the outer surface of the panel or on the outer surface of the funnel with the inner magnetic shield interposed therebetween. The cathode ray tube device according to claim 1, wherein:
【請求項3】複数組の補償コイル対のうち水平偏向漏洩
磁場の中心を通る管軸に垂直な平面の他側に配置される
補償コイル対が偏向ヨークの磁芯上に配置されることを
特徴とする請求項1記載の陰極線管装置。
3. A compensating coil pair arranged on the other side of a plane perpendicular to the tube axis passing through the center of the horizontal deflection leakage magnetic field among the plurality of compensating coil pairs is arranged on the magnetic core of the deflection yoke. The cathode ray tube device according to claim 1, which is characterized in that.
JP1146979A 1989-06-09 1989-06-09 Cathode ray tube device Expired - Fee Related JPH0752631B2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP1146979A JPH0752631B2 (en) 1989-06-09 1989-06-09 Cathode ray tube device
EP90110822A EP0401831B1 (en) 1989-06-09 1990-06-07 Cathode ray tube apparatus intended to reduce magnetic fluxes leaked outside the apparatus
DE69028146T DE69028146T2 (en) 1989-06-09 1990-06-07 Cathode ray tube device for reducing magnetic stray fluxes outside the device
KR1019900008588A KR920010657B1 (en) 1989-06-09 1990-06-08 Cathod ray tube lessening leakage magnetic field
US07/888,281 US5189348A (en) 1989-06-09 1992-05-26 Cathode ray tube apparatus intended to reduce magnetic fluxes leaked outside the apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1146979A JPH0752631B2 (en) 1989-06-09 1989-06-09 Cathode ray tube device

Publications (2)

Publication Number Publication Date
JPH0311531A JPH0311531A (en) 1991-01-18
JPH0752631B2 true JPH0752631B2 (en) 1995-06-05

Family

ID=15419885

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1146979A Expired - Fee Related JPH0752631B2 (en) 1989-06-09 1989-06-09 Cathode ray tube device

Country Status (4)

Country Link
EP (1) EP0401831B1 (en)
JP (1) JPH0752631B2 (en)
KR (1) KR920010657B1 (en)
DE (1) DE69028146T2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2297423A (en) * 1995-01-24 1996-07-31 Ibm CRT display apparatus with reduced stray magnetic fields
US5959392A (en) * 1995-01-24 1999-09-28 International Business Machines Corporation Cancellation coil arrangement for reducing stray magnetic field emissions from CRT displays

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR900001503B1 (en) * 1985-09-13 1990-03-12 미쓰비시전기 주식회사 Radiation suppression device
SE452077C (en) * 1986-03-04 1992-12-07 Blixt Autovision DEVICE TO REDUCE UNWANTED LEAKFIELD ACTIVITIES IN FRONT OF CATHEDRAL TUBE SCREEN
JPS6312148U (en) * 1986-07-10 1988-01-26
NL8701109A (en) * 1987-05-11 1988-12-01 Philips Nv IMAGE DISPLAY DEVICE WITH SPRAY COMPENSATION COMPONENTS.

Also Published As

Publication number Publication date
EP0401831A1 (en) 1990-12-12
DE69028146T2 (en) 1997-02-20
KR920010657B1 (en) 1992-12-12
EP0401831B1 (en) 1996-08-21
JPH0311531A (en) 1991-01-18
KR910001849A (en) 1991-01-31
DE69028146D1 (en) 1996-09-26

Similar Documents

Publication Publication Date Title
US4943755A (en) Magnetic shielding with constant-current coils for CRT
JP2771624B2 (en) Frame corrected image display system
JPH0752631B2 (en) Cathode ray tube device
US5189348A (en) Cathode ray tube apparatus intended to reduce magnetic fluxes leaked outside the apparatus
KR900005541B1 (en) Color cathode-ray tube
JPH05159713A (en) Color picture tube
EP1460673A2 (en) Cathode ray tube apparatus having velocity modulation coil
JP2567107B2 (en) Cathode ray tube device
JP3109744B2 (en) Cathode ray tube device
JPH01173550A (en) Deflecting device for in-line type color picture tube
JPS59101745A (en) Color picture tube
JP2003199120A (en) Color cathode ray tube
JPH0359931A (en) Deflection yoke for color television picture tube
JPH0646142Y2 (en) Leakage magnetic flux reduction device
JPH0414736A (en) Cathode ray tube device
JPH01154442A (en) Cathode-ray tube display device
JPH01154441A (en) Deflection yoke device
JPH03208239A (en) Cathode ray tube device
JPS6376244A (en) Deflecting yoke unit
JPH01225047A (en) Color picture tube device
JPH04245149A (en) Cathode ray tube device
JPH0541177A (en) Color cathode-ray tube
JPH01157035A (en) Color cathode-ray tube
JPH03105830A (en) Deflecting yoke
JPH11354050A (en) Deflection yoke and cathode-ray tube device

Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees