JPH0312421B2 - - Google Patents
Info
- Publication number
- JPH0312421B2 JPH0312421B2 JP7226781A JP7226781A JPH0312421B2 JP H0312421 B2 JPH0312421 B2 JP H0312421B2 JP 7226781 A JP7226781 A JP 7226781A JP 7226781 A JP7226781 A JP 7226781A JP H0312421 B2 JPH0312421 B2 JP H0312421B2
- Authority
- JP
- Japan
- Prior art keywords
- permanent magnet
- cathode ray
- ray tube
- electron
- magnetic field
- 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
Links
- 238000010894 electron beam technology Methods 0.000 claims description 13
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 4
- 238000007493 shaping process Methods 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 2
- 230000005415 magnetization Effects 0.000 claims 1
- 238000000034 method Methods 0.000 description 6
- 238000009826 distribution Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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
- H01J29/58—Arrangements for focusing or reflecting ray or beam
- H01J29/64—Magnetic lenses
- H01J29/68—Magnetic lenses using permanent magnets only
Description
【発明の詳細な説明】
本発明は磁気集束型陰極線管に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetically focused cathode ray tube.
陰極線管の管軸方向の磁界を用いて、電子ビー
ム集束を実施する磁気集束方式は従来行われてい
る精電集束方式に比べ、良好なフオーカス特性が
得られ、かつ、従来必要であつたフオーカス電極
が不要となる利点がある。このため陰極線管のネ
ツク側先端のステムからの高電圧供給が不要とな
り陰極線管の信頼性が向上し、フオーカス電圧供
給回路が除去出来る大きな利点がある。磁気集束
方式には電磁コイルを用いる方法と永久磁石を用
いる方法とがあるが前者は集束電力、コスト、重
さ等に難点があり、また永久磁石の場合にはネツ
ク部に内蔵することも可能であり実用上永久磁石
を用いる方が良い。カラー受像管の様に複数の電
子銃を有する陰極線管に於ては、各電子銃各々に
集束磁界を分割、整形して印加する必要があり、
このためには永久磁石にて発生する磁界を集中、
整形するための磁気ヨークを必要とする。しかし
ながら磁気ヨークの構成にも限界があり、単に磁
気ヨークの形状、板厚等の改良のみで充分に磁界
整形が実施出来るわけではない。 The magnetic focusing method, which uses a magnetic field in the tube axis direction of a cathode ray tube to focus the electron beam, provides better focus characteristics than the conventional electromagnetic focusing method, and is able to achieve better focus characteristics than the conventional electromagnetic focusing method. This has the advantage of not requiring electrodes. Therefore, there is no need to supply high voltage from the stem at the end of the neck side of the cathode ray tube, which improves the reliability of the cathode ray tube, and has the great advantage of eliminating the focus voltage supply circuit. Magnetic focusing methods include methods that use electromagnetic coils and methods that use permanent magnets, but the former has drawbacks such as focusing power, cost, and weight, and in the case of permanent magnets, it is also possible to incorporate them into the neck part. Therefore, it is better to use a permanent magnet in practice. In cathode ray tubes that have multiple electron guns, such as color picture tubes, it is necessary to divide and shape the focusing magnetic field and apply it to each electron gun.
For this purpose, the magnetic field generated by the permanent magnet is concentrated,
Requires magnetic yoke for shaping. However, there are limits to the configuration of the magnetic yoke, and it is not possible to sufficiently shape the magnetic field simply by improving the shape, plate thickness, etc. of the magnetic yoke.
第１図は従来の磁気集束型カラー陰極線管の概
略図である。１，２は内部を真空に保持する為の
ガラス製外囲器のパネル及びフアンネルであり、
フアンネル２のネツク部３内部には３本の電子ビ
ーム４を射出、制御する電子銃５が封入されてい
る。さらに、パネル１内面には３色の蛍光体スク
リーン６が塗布形成されており、この蛍光体スク
リーン６と電子銃５間には色選別用シヤドウマス
ク７がスクリーン６近傍に配設されている。８は
遍向装置である。第２図は第１図の電子銃５部分
の断面拡大図である。陰極線管ネツク３内には磁
界発生用永久磁石１０と３電子銃各々に対応した
円筒状磁気ヨーク１１が配設されている。第３図
に示す如く磁気ヨーク１１は各電子銃ごとに管軸
方向に配列され互いに対向した少くとも２個の磁
気ヨーク１１より構成される。永久磁石１０より
発生した磁界は上記磁気ヨーク１１の一方に一担
集中され、対向する磁気ヨーク間のキヤツプ１２
に於て集中的に電子ビーム通路上に形成され、さ
らに他方の磁気ヨークに再度集中され永久磁石１
０にもどる。磁気ヨーク間ギヤツプ１２の磁界は
対向した円筒状磁気ヨークによりその形状、ギヤ
ツプ量等を調整して各電子銃ごとにほぼ対称形状
磁界となることが出来るが、永久磁石の性質上永
久磁石より無限遠方に向つて延びる磁力線１３が
必らず存在する。 FIG. 1 is a schematic diagram of a conventional magnetically focused color cathode ray tube. 1 and 2 are glass envelope panels and funnels for maintaining the interior in a vacuum;
An electron gun 5 for emitting and controlling three electron beams 4 is enclosed within the neck portion 3 of the funnel 2. Furthermore, a three-color phosphor screen 6 is coated on the inner surface of the panel 1, and a color selection shadow mask 7 is disposed near the screen 6 between the phosphor screen 6 and the electron gun 5. 8 is an omnidirectional device. FIG. 2 is an enlarged sectional view of the electron gun 5 portion of FIG. 1. A permanent magnet 10 for generating a magnetic field and a cylindrical magnetic yoke 11 corresponding to each of the three electron guns are disposed within the cathode ray tube network 3. As shown in FIG. 3, the magnetic yokes 11 for each electron gun are composed of at least two magnetic yokes 11 arranged in the tube axis direction and facing each other. The magnetic field generated by the permanent magnet 10 is concentrated on one side of the magnetic yoke 11, and the magnetic field is concentrated on one side of the magnetic yoke 11, and the magnetic field is concentrated on one side of the magnetic yoke 11, and the magnetic field is concentrated on one side of the magnetic yoke 11.
The electron beam is formed intensively on the electron beam path, and is further concentrated again on the other magnetic yoke to form a permanent magnet 1.
Return to 0. The magnetic field of the gap 12 between the magnetic yokes can be made into a nearly symmetrical magnetic field for each electron gun by adjusting its shape, gap amount, etc. using the opposing cylindrical magnetic yokes, but due to the nature of permanent magnets, it is more infinite than permanent magnets. There are always lines of magnetic force 13 that extend toward the distance.
第４図は第３図Ａ−A′断面の磁界分布を示す。
即ち、３電子銃のうち中央電子銃４１の中心に於
てはＡ−A′断面内の磁界は存在しないのに対し、
両サイド電子銃４２の中心に於ては外方向に磁界
Brが存在する。この外方向磁界Brは電子ビーム
通過方向に対し垂直であり電子ビームは遍向効果
を受ける。両サイドビームは上記偏向効果を互い
に逆方向に受け結果として３本の電子ビームは中
央の電子ビームを中心として回転することとな
る。この様な場合には、３電子ビームのコンバー
ゼンス特性が劣化することは周知のことであり望
ましくない。 FIG. 4 shows the magnetic field distribution in the section A-A' in FIG. 3.
That is, at the center of the central electron gun 41 of the three electron guns, there is no magnetic field within the A-A' cross section, whereas
At the center of both side electron guns 42, the magnetic field is directed outward.
Br exists. This outward magnetic field Br is perpendicular to the electron beam passing direction, and the electron beam is subjected to a unidirectional effect. Both side beams receive the deflection effect in opposite directions, and as a result, the three electron beams rotate about the central electron beam. In such a case, it is well known that the convergence characteristics of the three electron beams deteriorate, which is undesirable.
本発明は以上の点に鑑みてなされたもので、永
久磁石に両サイドビームの遍向磁界成分を最小限
とすることにより磁気ヨークの製作を容易ならし
め、３電子ビームの回転効果を極小とし良好なコ
ンバーゼンスを保持しつつ磁気集束を実現する磁
気集束型カラー陰極線管を提供するものである。 The present invention has been made in view of the above points, and it facilitates the manufacture of a magnetic yoke by minimizing the omnidirectional magnetic field components of both side beams in a permanent magnet, and minimizes the rotational effect of the three electron beams. The present invention provides a magnetically focused color cathode ray tube that achieves magnetic focusing while maintaining good convergence.
以下本発明を詳細に説明する。 The present invention will be explained in detail below.
第５図は本発明に係る３電子銃磁気集束用永久
磁石の１実施例の斜視図である。この永久磁石５
１，５１′は各々円筒の一部の形状を有し、その
端面は円弧状であり、更に永久磁石５１，５１′
の端面はＮ又はＳ極に磁化され２個の永久磁石に
よりその内部に非常に均一な磁界を形成する。 FIG. 5 is a perspective view of an embodiment of a permanent magnet for three-electron gun magnetic focusing according to the present invention. This permanent magnet 5
1 and 51' each have the shape of a part of a cylinder, the end face of which is arcuate, and permanent magnets 51 and 51'
The end face of the magnet is magnetized to the north or south pole, and two permanent magnets form a very uniform magnetic field inside the magnet.
第６図ａは上記円弧状永久磁石６１の断面図を
示すもので、角度θは中央電子銃６２より永久磁
石６１を見込む角である。第６図ｂは両サイド電
子銃６３の位置に於けるラジアル方向磁界成分
（Br）の相対強度分布を示す。この実施例では中
央／サイド電子銃間距離を6.0mm、永久磁石内径
約20mm、同外径約24mmとした。図中には上記永久
磁石の見込み角θをパラメーターとしてBrと永
久磁石中心に於けるBzとの相対値を示してある。
θ＝18°の場合は第６図ａのＹ軸近傍のみに永久
磁石が存在する場合に対応し、Brは永久磁石中
心からＺ軸方向に向つて増加し、永久磁石端面付
近で極大値をもちその後は除々に減少することを
示している。一方θ＝180°の場合には、円筒状永
久磁石に対応し、この場合にはθ＝18°の場合に
比し永久磁石端部のBrは逆特性をもち、遠方に
於ては極性が反転し非常に小さくなることを示し
ている。またθ＝108°の場合ではθ＝18°と同様
の分布をもつが強度的には約1/3となる。θ＝
180°とθ＝144°の比較でも強度は約1/3となる。
即ち永久磁石の見込み角θを最適に設定すること
によりビームの遍向を引き起すBr成分を非常に
小さくすることが出来る。この実施例の永久磁石
の見込み角θは100°〜150°が良好である。 FIG. 6a shows a cross-sectional view of the arc-shaped permanent magnet 61, and the angle θ is the angle at which the permanent magnet 61 is viewed from the central electron gun 62. FIG. 6b shows the relative intensity distribution of the radial magnetic field component (Br) at the positions of the electron guns 63 on both sides. In this embodiment, the distance between the center and side electron guns was 6.0 mm, the inner diameter of the permanent magnet was about 20 mm, and the outer diameter of the permanent magnet was about 24 mm. In the figure, the relative value of Br and Bz at the center of the permanent magnet is shown using the angle of view θ of the permanent magnet as a parameter.
When θ = 18°, this corresponds to the case where the permanent magnet exists only near the Y-axis in Figure 6a, and Br increases from the center of the permanent magnet toward the Z-axis and reaches its maximum value near the end face of the permanent magnet. It shows that it gradually decreases after that. On the other hand, when θ = 180°, it corresponds to a cylindrical permanent magnet, and in this case, compared to the case when θ = 18°, the Br at the end of the permanent magnet has opposite characteristics, and the polarity changes at a distance. It shows that it has reversed and become very small. Also, in the case of θ=108°, the distribution is similar to that of θ=18°, but the intensity is about 1/3. θ=
Even when comparing 180° and θ=144°, the strength is about 1/3.
That is, by optimally setting the viewing angle θ of the permanent magnet, the Br component that causes beam deflection can be made extremely small. The angle of view θ of the permanent magnet in this example is preferably 100° to 150°.
以上の様に所定の見込み角をθを有する永久磁
石に磁界整形用ヨークを用いることにより、３個
の電子銃各々に偏向磁界Brを極力小さくした集
束磁界を印加することが出来、３電子銃のコンバ
ーゼンス特性を劣化させることなく良好なフオー
カス特性を有する磁気集束型陰極線管が得られ
る。 As described above, by using a magnetic field shaping yoke on a permanent magnet having a predetermined angle of view θ, it is possible to apply a focusing magnetic field with the deflection magnetic field Br as small as possible to each of the three electron guns. A magnetically focused cathode ray tube having good focus characteristics can be obtained without deteriorating the convergence characteristics of the tube.
第７図乃至第９図は本発明に係る他の実施例で
ある。第７図は３電子銃の水平配列線に対して上
下にそれぞれ２個の永久磁石７０を配し、中央電
子銃７１上下での永久磁石−電子銃距離に比し両
サイド電子銃上下での永久磁石−電子銃距離を小
さくしてある。即ち永久磁石断面が傾斜してお
り、サイド電子銃上下では電子ビーム路により近
接させてある。この様に永久磁石を所定の位置、
角度に配置することにより前述の円弧状永久磁石
の場合と同様な効果が得られる。また第８図及び
第９図は本発明の更に他の実施例を示すもので、
第８図は両サイド電子銃上下に於て、永久磁石７
０の肉厚を大としたもの、第９図は複数個の永久
磁石７０を配設したものである。この第８図及び
第９図の場合も第５図乃至第７図と同様に両サイ
ド電子銃上のラジアル方向磁界成分を極力減少さ
せることが出来る。 FIGS. 7 to 9 show other embodiments of the present invention. In FIG. 7, two permanent magnets 70 are arranged above and below the horizontal array line of three electron guns, and the distance between the permanent magnets and the electron guns above and below the central electron gun 71 is larger than the distance between the permanent magnets and the electron guns above and below the central electron gun 71. The permanent magnet-electron gun distance is kept small. That is, the permanent magnet cross section is inclined, and the upper and lower sides of the side electron guns are brought closer to the electron beam path. In this way, place the permanent magnet in the specified position,
By arranging them at an angle, the same effect as in the case of the arc-shaped permanent magnet described above can be obtained. Further, FIGS. 8 and 9 show still other embodiments of the present invention,
Figure 8 shows the permanent magnets 7 above and below the electron guns on both sides.
9 is one in which a plurality of permanent magnets 70 are arranged. In the case of FIGS. 8 and 9 as well, the radial direction magnetic field components on both side electron guns can be reduced as much as possible as in FIGS. 5 to 7.
以上の様に本発明によれば、永久磁石及び磁気
ヨークを併用することにより３電子銃各々に対称
性のよい集束磁界を与えることが出来、コンバー
ゼンス特性劣化を招くことなく良好なフオーカス
特性を有する磁気集束型陰極線を得ることができ
る。 As described above, according to the present invention, by using a permanent magnet and a magnetic yoke in combination, it is possible to provide a well-symmetrical focusing magnetic field to each of the three electron guns, and to have good focus characteristics without causing deterioration of convergence characteristics. Magnetically focused cathode rays can be obtained.
第１図は従来の磁気集束型陰極線管を示す概略
断面図、第２図は第１図の電子銃部分の概略断面
図、第３図は第２図の動作を説明する為の概略横
断面図、第４図は第３図のＡ−A′線で切つた概
略断面図、第５図は本発明の実施例を示す概略斜
視図、第６図ａは第５図の概略断面図、第６図ｂ
は第５図の磁界分布を示す概略特性図、第７図乃
至第９図は本発明の他の実施例を示す概略断面図
である。
５１，６１，７０……永久磁石、６２，７１…
…中央電子銃、６３，７２……サイド電子銃。
Fig. 1 is a schematic cross-sectional view showing a conventional magnetically focused cathode ray tube, Fig. 2 is a schematic cross-sectional view of the electron gun portion of Fig. 1, and Fig. 3 is a schematic cross-sectional view to explain the operation of Fig. 2. 4 is a schematic sectional view taken along line A-A' in FIG. 3, FIG. 5 is a schematic perspective view showing an embodiment of the present invention, FIG. 6a is a schematic sectional view of FIG. 5, Figure 6b
5 is a schematic characteristic diagram showing the magnetic field distribution, and FIGS. 7 to 9 are schematic sectional views showing other embodiments of the present invention. 51,61,70...Permanent magnet, 62,71...
...Central electron gun, 63,72...Side electron gun.
Claims (1)
部内に封入され電子ビームを射出し制御手段を有
するインライン状に配列した３個の電子銃と前記
外囲器の他端部の内面に塗布形成された蛍光面及
び蛍光面近傍に配設したシヤドウマスクを主たる
要素として構成される陰極線管であつて、前記電
子ビームの集束手段として管軸方向の磁界発生用
永久磁石と、磁界整形用磁気ヨークを備えた磁気
集束型陰極線管に於て、前記磁気ヨークは３個の
電子銃各々に対応して配置され、前記永久磁石は
３電子銃の水平配列線に対して上下に配置され、
且つ中央電子銃の中心から永久磁石の最外端を見
込む見込み角θが100°≦θ≦150°であり前記永久
磁石により発生する磁界のラジアル成分が中央電
子銃上で実質的にゼロ、両サイド電子銃上で極力
小さくしたことを特徴とする磁気集束型陰極線
管。 ２ 前記永久磁石により発生する磁界のラジアル
成分が両サイド電子銃上で永久磁石端面付近と遠
方とで逆極性を有し、かつ、極力小さいことを特
徴とする特許請求の範囲第１項記載の磁気集束型
陰極線管。 ３ 前記永久磁石は３電子銃の水平配列線に対し
て上下に配置され、中央電子銃上下から離れるに
従つて両サイド電子銃に接近するか、もしくは着
磁量が増大するか、又は永久磁石の厚みが増加す
ることを特徴とする特許請求の範囲第１項記載の
磁気集束型陰極線管。 ４ 前記永久磁石が３電子銃の水平配列線に対し
て上下にそれぞれの断面が大旨円弧状形状であ
り、管軸に添つて長手方向を有することを特徴と
する特許請求の範囲第１項記載の磁気集束型陰極
線管。[Scope of Claims] 1. A glass envelope, three electron guns sealed in a neck portion at one end of the envelope and arranged in-line and having control means for emitting electron beams, and the envelope. It is a cathode ray tube mainly composed of a phosphor screen coated on the inner surface of the other end and a shadow mask disposed near the phosphor screen, and a permanent magnet for generating a magnetic field in the tube axis direction as a focusing means for the electron beam. In a magnetically focused cathode ray tube equipped with a magnet and a magnetic yoke for shaping the magnetic field, the magnetic yoke is arranged corresponding to each of the three electron guns, and the permanent magnet is arranged so as to correspond to the horizontal array line of the three electron guns. arranged one above the other,
In addition, the viewing angle θ from the center of the central electron gun to the outermost end of the permanent magnet is 100°≦θ≦150°, and the radial component of the magnetic field generated by the permanent magnet is substantially zero on the central electron gun. A magnetically focused cathode ray tube characterized by having the side electron gun as small as possible. 2. The radial component of the magnetic field generated by the permanent magnet has opposite polarity in the vicinity of the end face of the permanent magnet and in the distance on both side electron guns, and is as small as possible. Magnetic focusing cathode ray tube. 3 The permanent magnets are arranged above and below the horizontal array line of the 3 electron guns, and as they move away from the top and bottom of the central electron gun, they approach the electron guns on both sides, or the amount of magnetization increases, or the permanent magnets 2. The magnetically focused cathode ray tube according to claim 1, wherein the thickness of the magnetically focused cathode ray tube increases. 4. Claim 1, wherein each of the permanent magnets has a substantially arc-shaped cross section above and below the horizontal array line of the three electron guns, and has a longitudinal direction along the tube axis. The magnetically focused cathode ray tube described above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7226781A JPS57187844A (en) | 1981-05-15 | 1981-05-15 | Magnetic focusing crt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7226781A JPS57187844A (en) | 1981-05-15 | 1981-05-15 | Magnetic focusing crt |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57187844A JPS57187844A (en) | 1982-11-18 |
| JPH0312421B2 true JPH0312421B2 (en) | 1991-02-20 |
Family
ID=13484331
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7226781A Granted JPS57187844A (en) | 1981-05-15 | 1981-05-15 | Magnetic focusing crt |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57187844A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL8204465A (en) * | 1982-11-18 | 1984-06-18 | Philips Nv | COLOR IMAGE TUBE. |
| FR2544548B1 (en) * | 1983-04-18 | 1985-12-27 | Videocolor Sa | COLORED TELEVISION TUBE WITH CORRECTION OF LOW AMPLITUDE COMA DEFECTS |
-
1981
- 1981-05-15 JP JP7226781A patent/JPS57187844A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57187844A (en) | 1982-11-18 |
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