JPS6310861B2 - - Google Patents
Info
- Publication number
- JPS6310861B2 JPS6310861B2 JP8921680A JP8921680A JPS6310861B2 JP S6310861 B2 JPS6310861 B2 JP S6310861B2 JP 8921680 A JP8921680 A JP 8921680A JP 8921680 A JP8921680 A JP 8921680A JP S6310861 B2 JPS6310861 B2 JP S6310861B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- magnetic field
- yokes
- focusing
- ray tube
- 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 11
- 238000009826 distribution Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 239000004020 conductor Substances 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 206010010071 Coma Diseases 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000035699 permeability Effects 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
- H01J29/56—Arrangements for controlling cross-section of ray or beam; Arrangements for correcting aberration of beam, e.g. due to lenses
Description
【発明の詳細な説明】
本発明は電磁集束形陰極線管、特に偏向特性、
コンバーゼンス特性およびフオーカス特性を改良
した電磁集束形陰極線管に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electromagnetic focusing cathode ray tube, particularly to
This invention relates to an electromagnetic focusing cathode ray tube with improved convergence characteristics and focus characteristics.
第１図および第２図は従来の電子銃が一直線上
にならび、かつ磁界発生手段がネツク管外に配設
されたいわゆるインライン配列外磁形電磁集束陰
極線管の一例を示す陰極線管ネツク部の断面図
で、第１図はインライン配列方向、第２図はそれ
と直角な平面を示している。 FIGS. 1 and 2 show an example of a so-called in-line magnetic type electromagnetic focusing cathode ray tube in which the conventional electron guns are aligned in a straight line and the magnetic field generating means is disposed outside the neck tube. In the cross-sectional views, FIG. 1 shows the inline arrangement direction, and FIG. 2 shows a plane perpendicular to the inline arrangement direction.
これらの図において、１は外囲器、２は陰極、
３は第１グリツド電極、４は第２グリツド電極、
５はG3ボトム、６は一対の磁性体ヨークで、６
ａは陰極側また６ｂは螢光面側磁性体ヨークであ
る。７は複数個の陽極導通片、８は内部導通体で
外囲器１の内壁面に被着形成されている。９は永
久磁石で、これは管外で、かつ磁性体ヨーク６間
の中央部に相当する位置に配設されている。１０
は複数本のステムリードで図示しないが外囲器１
内で電極と接続されている。１１は電極支持棒
で、通常ガラスから構成されている。１２C，１
２S1，１２S2はセンタおよびサイド電子ビームを
示している。１３はプリフオーカスレンズ、１４
はビーム通過孔、１５は磁気主レンズ、１６は継
鉄である。 In these figures, 1 is the envelope, 2 is the cathode,
3 is a first grid electrode, 4 is a second grid electrode,
5 is G3 bottom, 6 is a pair of magnetic yokes, 6
A is a magnetic yoke on the cathode side, and 6b is a magnetic yoke on the fluorescent side. Reference numeral 7 denotes a plurality of anode conduction pieces, and 8 an internal conductor, which are adhered to the inner wall surface of the envelope 1. Reference numeral 9 denotes a permanent magnet, which is disposed outside the tube and at a position corresponding to the center between the magnetic yokes 6. 10
Although not shown in the figure, there are multiple stem leads in the envelope 1.
connected to the electrode inside. Reference numeral 11 denotes an electrode support rod, which is usually made of glass. 12C ,1
2 S1 and 12 S2 indicate the center and side electron beams. 13 is a pre-focus lens, 14
15 is a beam passing hole, 15 is a magnetic main lens, and 16 is a yoke.
このように構成された電磁集束形陰極線管にお
いて、陰極２より放射した中央電子ビーム１２C、
サイド電子ビーム１２S1，１２S2はそれぞれ第１
グリツド電極３、第２グリツド電極４を通過し、
一旦電子ビームは集束され、いわゆるクロスオー
バーを形成する。その後、ビームは陽極電位によ
り加速され、G3ボトム５と第２グリツド電極４
とで形成されるプリフオーカスレンズ１３を通過
し、内装導電体８から陽極導通片７を介して陽極
電圧が印加された磁性体ヨーク６の電子ビーム通
過孔１４を通過して図示しない螢光面に到達す
る。 In the electromagnetic focusing cathode ray tube configured in this way, the central electron beam 12 C emitted from the cathode 2,
The side electron beams 12 S1 and 12 S2 are the first
It passes through the grid electrode 3, the second grid electrode 4,
Once the electron beam is focused, it forms a so-called crossover. The beam is then accelerated by the anode potential and connects the G 3 bottom 5 and the second grid electrode 4.
Fluorescence (not shown) passes through the pre-focus lens 13 formed by the electron beam, and passes through the electron beam passage hole 14 of the magnetic yoke 6 to which an anode voltage is applied from the internal conductor 8 via the anode conduction piece 7. reach the surface.
一方、高透磁率磁性体よりなる一対の磁性体ヨ
ーク６は、永久磁石９より発生する磁界を吸収
し、磁性体ヨーク６間の間隙部６ｇに強い集束磁
界が発生し、該部分が磁界主レンズ１５を形成す
る。この時、集束磁界が均一となるように永久磁
石９は磁性体ヨーク６の間隙部６ｇと所定関係を
保つように配設する。 On the other hand, the pair of magnetic yokes 6 made of a high magnetic permeability magnetic material absorb the magnetic field generated by the permanent magnet 9, and a strong focused magnetic field is generated in the gap 6g between the magnetic yokes 6, making this part the main magnetic field. A lens 15 is formed. At this time, the permanent magnet 9 is arranged to maintain a predetermined relationship with the gap 6g of the magnetic yoke 6 so that the focused magnetic field is uniform.
したがつて、ここを通過した電子ビーム１２C，
１２S1，１２S2は集束作用を受け、クロスオーバ
の像点を螢光面上に結ぶとともに、３色ビーム１
２C，１２S1，１２S2が螢光面上の一点で合致する
効果、つまりSTCの改善にも大きな効果をもつ
ている。 Therefore, the electron beam 12 C that passed here,
12 S1 and 12 S2 receive a focusing effect, focusing the image point of the crossover on the fluorescent surface, and also focusing the three-color beam 1.
The effect that 2 C , 12 S1 , and 12 S2 coincide at one point on the fluorescent surface, that is, has a great effect on improving STC.
しかしながら、上記構成による電磁集束形陰極
線管においては、磁性体ヨーク６ａ，６ｂの小孔
部のみに集束磁界を局在させることができないの
で、磁性体ヨーク６の陰極側および螢光面側に漏
洩磁界が発生し、STCおよびビームスポツト形
状に多大な悪影響をおよぼし、また偏向磁界との
干渉によつて、画面を回転させてしまうなどの悪
影響をおよぼしていた。これは永久磁石９のみで
発生させる磁界では管軸方向の磁界Bzは
∫∞ -∞Bz・dz＝０
を満足しなければならず、管軸上の磁界Bzは実
験によれば、第３図に示したような磁界分布特性
となつている。すなわち同図において、特性Iaで
示す部分の分布が磁性体ヨーク６ａ，６ｂ間の間
隙部６ｇに発生する集束磁界であり、特性ｂ、
ｃで示す分布がそれぞれ陰極側、螢光面側に漏
洩する漏洩磁界であり、この磁性体ヨーク６の両
端側に分布する漏洩磁界は上式で示す磁界の性質
からこの特性ｂ、ｃで示す分布の漏洩磁界の
みを低減することは全く不可能に等かつた。そし
て、陰極側に分布する漏洩磁界は陰極２から放射
されて螢光面に向う電子ビームに作用して管軸方
向に垂直なローレンツ力が働き、サイド電子ビー
ム１２S1，１２S2の軌道が中心軸からずれ、コマ
収差が発生してフオーカス特性が大幅に低下す
る。また、螢光面側に分布する漏洩磁界は、画面
上での直交度を低下させたり、コンバーゼンス特
性等にも問題が生じていた。 However, in the electromagnetic focusing cathode ray tube with the above configuration, it is not possible to localize the focusing magnetic field only in the small holes of the magnetic yokes 6a and 6b, so leakage occurs to the cathode side and fluorescent surface side of the magnetic yoke 6. A magnetic field is generated, which has a significant negative effect on the STC and beam spot shape, and interference with the deflection magnetic field causes the screen to rotate. This is because in the magnetic field generated only by the permanent magnet 9, the magnetic field Bz in the tube axis direction must satisfy ∫ ∞ -∞ Bz・dz=0, and according to experiments, the magnetic field Bz on the tube axis is as shown in Figure 3. The magnetic field distribution characteristics are as shown in . That is, in the same figure, the distribution of the part indicated by characteristic Ia is the focused magnetic field generated in the gap 6g between the magnetic yokes 6a and 6b, and the distribution of characteristic b,
The distributions indicated by c are the leakage magnetic fields leaking to the cathode side and the fluorescent surface side, respectively, and the leakage magnetic fields distributed at both ends of the magnetic yoke 6 are represented by the characteristics b and c based on the magnetic field properties shown in the above equation. It is almost impossible to reduce only the distributed leakage magnetic field. Then, the leakage magnetic field distributed on the cathode side acts on the electron beams radiated from the cathode 2 and directed toward the fluorescent surface, exerting a Lorentz force perpendicular to the tube axis direction, and the orbits of the side electron beams 12 S1 and 12 S2 are centered. Off-axis, coma aberration occurs, and focus characteristics are significantly degraded. In addition, the leakage magnetic field distributed on the fluorescent surface side reduces the degree of orthogonality on the screen and causes problems in convergence characteristics and the like.
したがつて本発明は、上記のような欠点のない
電磁集束形陰極線管を提供することを目的として
いる。 SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an electromagnetic focusing cathode ray tube that does not have the above-mentioned drawbacks.
このような目的を達成するために本発明におい
ては、磁性体ヨークを管軸方向に複数対配置した
ものである。 In order to achieve such an object, in the present invention, a plurality of pairs of magnetic yokes are arranged in the tube axis direction.
以下、図面を用いて本発明の実施例を詳細に説
明する。 Embodiments of the present invention will be described in detail below with reference to the drawings.
第４図は本発明による電磁集束形陰極線管の一
例を示す第２図に相当する部分の図であり、第１
図、第２図と同じ部分には同一符号を付し、詳細
な説明は省略する。第４図において、磁性体ヨー
ク６ａ，６ｂの螢光面側には、２組の磁性体ヨー
ク６ｃ，６ｄおよび６ｅ，６ｆが同一管軸上にそ
れぞれ所定距離離して対向配置されている。つま
り、磁性体ヨーク６ａ，６ｂと６ｃ，６ｄと６
ｅ，６ｆとの各組合せからなる３対の磁性体ヨー
クが設けられ、これら２対目および３対目の磁性
体ヨーク６ｃ，６ｄおよび６ｅ，６ｆは１対目の
磁性体ヨーク６ａ，６ｂとほぼ同等の材質と、適
宜な寸法形状を有して形成されている。また、２
対目の磁性体ヨーク６ｃ，６ｄ間の中央部に相当
する外囲器１の外面には永久磁石９がその中心軸
を一致させて配置されている。 FIG. 4 is a diagram of a portion corresponding to FIG. 2 showing an example of an electromagnetic focusing cathode ray tube according to the present invention.
Components that are the same as those in FIG. In FIG. 4, two sets of magnetic yokes 6c, 6d and 6e, 6f are arranged facing each other at a predetermined distance apart on the same tube axis on the fluorescent surface side of the magnetic yokes 6a, 6b. In other words, magnetic yokes 6a, 6b and 6c, 6d and 6
Three pairs of magnetic yokes consisting of respective combinations of magnetic yokes 6c, 6d and 6e, 6f are provided, and the second and third pairs of magnetic yokes 6c, 6d and 6e, 6f are combined with the first pair of magnetic yokes 6a, 6b. They are made of substantially the same material and have appropriate dimensions and shapes. Also, 2
A permanent magnet 9 is arranged on the outer surface of the envelope 1 corresponding to the center between the opposite magnetic yokes 6c and 6d, with their central axes aligned.
このような構成によれば、磁性体ヨーク６ａ〜
６ｆ間には第５図に実線で示したような磁界分布
特性が得られる。すなわち、中央部分に永久磁石
９を配置した磁性体ヨーク６ｃ，６ｄ間の間隙部
６ｈには特性ａで示す集束磁界が得られ、磁性
体ヨーク６ａ，６ｂ間の間隙部６ｇおよび磁性体
ヨーク６ｅ，６ｆの間隙部６ｉにはそれぞれ
ｂ、ｃで示す集束磁界が得られた。つまり第５
図に点線で示した従来の漏洩磁界分布特性ｂ、
ｃで示した漏洩磁界が磁性体ヨーク６ａ，６ｂ
の間隙部６ｇおよび磁性体ヨーク６ｅ，６ｆの間
隙部６ｉにそれぞれ局在され、特性ｂ、ｃで
示したような集束磁界に変形されて集束磁界レン
ズ１５ａ，１５ｂ，１５ｃが形成されることにな
る。したがつて、この３対の磁性体ヨーク６ａ〜
６ｆ間の間隙部６ｇ，６ｈ，６ｉ間には３組の集
束磁界レンズが形成されるので、フオーカス特性
を大幅に向上させることができた。また、磁性体
ヨーク６ａ，６ｆの陰極側、螢光面側には漏洩磁
界が全く発生しなくなるので、漏洩磁界による偏
向特性およびコンバーゼンス特性の劣化を零に抑
えることができた。さらには従来と全く同等寸法
の陰極線管に使用した場合には磁性体ヨークおよ
び永久磁石を小形、軽量化が可能となつた。 According to such a configuration, the magnetic yokes 6a-
A magnetic field distribution characteristic as shown by the solid line in FIG. 5 is obtained between 6f. That is, a focused magnetic field shown by characteristic a is obtained in the gap 6h between the magnetic yokes 6c and 6d in which the permanent magnet 9 is arranged in the center, and the focused magnetic field shown in characteristic a is obtained in the gap 6g between the magnetic yokes 6a and 6b and the magnetic yoke 6e. , 6f, respectively, focused magnetic fields indicated by b and c were obtained in the gap 6i. In other words, the fifth
Conventional leakage magnetic field distribution characteristics b shown by dotted lines in the figure,
The leakage magnetic field indicated by c is caused by the magnetic yokes 6a and 6b.
It is localized in the gap 6g and the gap 6i of the magnetic yokes 6e and 6f, respectively, and is transformed into a focusing magnetic field as shown by characteristics b and c to form focusing magnetic field lenses 15a, 15b, and 15c. Become. Therefore, these three pairs of magnetic yokes 6a~
Since three sets of focusing magnetic field lenses are formed between the gaps 6g, 6h, and 6i between the gaps 6f, the focus characteristics can be significantly improved. Further, since no leakage magnetic field is generated on the cathode side or the fluorescent surface side of the magnetic yokes 6a, 6f, it is possible to suppress the deterioration of the deflection characteristics and convergence characteristics due to the leakage magnetic field to zero. Furthermore, when used in a cathode ray tube of exactly the same size as the conventional one, the magnetic yoke and permanent magnet can be made smaller and lighter.
なお、上記実施例において、磁性体ヨークを３
対用いた場合について説明したが、本発明はこれ
に限定されるものではなく、２対、４対、５対等
の複数対用いても前述と全く同様の効果が得られ
ることはもちろんである。 In addition, in the above embodiment, the magnetic yoke is
Although the case where pairs are used has been described, the present invention is not limited to this, and it goes without saying that the same effect as described above can be obtained even when a plurality of pairs such as 2 pairs, 4 pairs, 5 pairs, etc. are used.
以上説明したように本発明による電磁集束形陰
極線管によれば、永久磁石からの洩れ磁界によ
る、偏向特性およびコンバーゼンス特性の劣化を
零とすることができるのみならず、フオーカス特
性も同時に向上させることができる極めて優れた
効果が得られる。 As explained above, according to the electromagnetic focusing cathode ray tube according to the present invention, it is possible not only to eliminate the deterioration of the deflection characteristics and convergence characteristics due to the leakage magnetic field from the permanent magnet, but also to improve the focus characteristics at the same time. Extremely excellent effects can be obtained.
第１図ないし第３図は従来の電磁集束形陰極線
管の一例を説明するための図、第４図および第５
図は本発明による電磁集束形陰極線管の一例を説
明するための図である。
１……外囲器、６，６ａ〜６ｆ……磁性体ヨー
ク、６ｇ〜６ｉ……間隙部、９……永久磁石、１
５ａ，１５ｂ，１５ｃ……集束磁界レンズ。
FIGS. 1 to 3 are diagrams for explaining an example of a conventional electromagnetic focusing cathode ray tube, and FIGS.
The figure is a diagram for explaining an example of an electromagnetic focusing cathode ray tube according to the present invention. 1...Envelope, 6,6a-6f...Magnetic yoke, 6g-6i...Gap, 9...Permanent magnet, 1
5a, 15b, 15c...Focusing magnetic field lenses.
Claims (1)
体ヨークと、前記電子ビーム集束用磁界発生手段
とを備えた電磁集束形陰極線管において、前記一
対の磁性体ヨークを複数対設けたことを特徴とす
る電磁集束形陰極線管。1. An electromagnetic focusing cathode ray tube comprising a pair of magnetic yokes having a plurality of electron beam passage holes and the electron beam focusing magnetic field generating means, characterized in that a plurality of pairs of the pair of magnetic yokes are provided. An electromagnetic focusing cathode ray tube.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8921680A JPS5715348A (en) | 1980-07-02 | 1980-07-02 | Electromagnetic focusing cathode ray tube |
| GB8119398A GB2079530B (en) | 1980-07-02 | 1981-06-24 | Magnetic focussing arrangement in a cathode ray tube |
| DE19813125977 DE3125977A1 (en) | 1980-07-02 | 1981-07-01 | ELECTROMAGNET FOCUSING CATHODE RAY TUBES |
| US06/279,598 US4439710A (en) | 1980-07-02 | 1981-07-01 | Electromagnetic focusing cathode-ray tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8921680A JPS5715348A (en) | 1980-07-02 | 1980-07-02 | Electromagnetic focusing cathode ray tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5715348A JPS5715348A (en) | 1982-01-26 |
| JPS6310861B2 true JPS6310861B2 (en) | 1988-03-09 |
Family
ID=13964516
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8921680A Granted JPS5715348A (en) | 1980-07-02 | 1980-07-02 | Electromagnetic focusing cathode ray tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5715348A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57191943A (en) * | 1981-05-21 | 1982-11-25 | Toshiba Corp | Cathode-ray tube of magnetic focusing type |
| JP2002216664A (en) * | 2001-01-19 | 2002-08-02 | Hitachi Ltd | Cathode ray tube |
-
1980
- 1980-07-02 JP JP8921680A patent/JPS5715348A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5715348A (en) | 1982-01-26 |
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