JPH0145701B2 - - Google Patents
Info
- Publication number
- JPH0145701B2 JPH0145701B2 JP54147935A JP14793579A JPH0145701B2 JP H0145701 B2 JPH0145701 B2 JP H0145701B2 JP 54147935 A JP54147935 A JP 54147935A JP 14793579 A JP14793579 A JP 14793579A JP H0145701 B2 JPH0145701 B2 JP H0145701B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic field
- horizontal deflection
- lens
- solenoid coil
- solenoid
- 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
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
Description
【発明の詳細な説明】
本発明は陰極線管用電子レンズに関し、更に詳
しくは水平走査に同期してダイナミツク集束をす
る低電力消費の磁界型電子レンズを提供するもの
である。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electron lens for a cathode ray tube, and more particularly to a magnetic field type electron lens with low power consumption that performs dynamic focusing in synchronization with horizontal scanning.
従来、陰極線管用の電子レンズとして、永久磁
石とソレノイドコイルを組み合せた種々の構造の
磁界型電子レンズが提案されている。磁界型電子
レンズは電界型電子レンズに比較して、陰極線管
のネツク部の真空容器の外に設置して使用するた
め大きな口径のレンズが使え、従つて螢光面上で
のスポツトも収差の少いものとなり、得られる再
生画像も尖鋭なものとなる等の長所を持つてい
る。 BACKGROUND ART Magnetic field type electron lenses of various structures in which permanent magnets and solenoid coils are combined have been proposed as electron lenses for cathode ray tubes. Compared to electric field type electron lenses, magnetic field type electron lenses are installed outside the vacuum container at the neck of the cathode ray tube, so they can use lenses with larger diameters, and the spot on the fluorescent surface is also less susceptible to aberrations. This has the advantage that the reproduced image obtained is also sharp.
第１図には、このような磁界型電子レンズを用
いた陰極線管を示し、電子銃１から発射された電
子ビーム４を磁界型電子レンズ２で集束させなが
ら偏向ヨーク３で偏向して螢光面上で走査と共に
スポツト４０１，４０２を作る様子を示してい
る。電子ビームの軌跡が螢光面中央にスポツトが
ある時は実線４０１で示し、偏向した時には点線
４０２で示してあるが、この際の磁界の分布を第
２図に示す。４０２に示すように電子ビームを偏
向した時には電子レンズの作用を弱くして、主レ
ンズ−像点距離が螢光面中央に比べて長くなるよ
うに焦点を結ばせる。磁界型電子レンズにおいて
は永久磁石で磁界４０３を作り、それに補助の磁
界４０５を重畳して時間と共に変る磁界分布４０
４を合成している。 FIG. 1 shows a cathode ray tube using such a magnetic field type electron lens, in which an electron beam 4 emitted from an electron gun 1 is focused by a magnetic field type electron lens 2 and deflected by a deflection yoke 3 to emit fluorescent light. It shows how spots 401 and 402 are created while scanning on a surface. When the trajectory of the electron beam is located at the center of the fluorescent surface, it is indicated by a solid line 401, and when it is deflected, it is indicated by a dotted line 402. The distribution of the magnetic field at this time is shown in FIG. When the electron beam is deflected as shown at 402, the action of the electron lens is weakened, and the electron beam is focused so that the distance between the main lens and the image point is longer than the center of the phosphor surface. In a magnetic field type electron lens, a magnetic field 403 is created using a permanent magnet, and an auxiliary magnetic field 405 is superimposed on it to create a magnetic field distribution 40 that changes over time.
4 is synthesized.
このような従来の磁界型電子レンズにおける問
題点は、ネツク管のほぼ軸上を通過する電子ビー
ムと電子レンズの軸を合致させるアライメント機
構、およびネツク管の軸方向に移動する機構が必
要であり、更に磁界型電子レンズの磁界の強さを
時間と共に変えるためソレノイドコイルに流す電
流を供給する回路を水平偏向回路とは別に設けて
いるので部品点数が多くなり、また、消費電力も
大きい欠点がある。 The problem with conventional magnetic field type electron lenses is that they require an alignment mechanism that aligns the axis of the electron beam with the electron beam that passes approximately on the axis of the network tube, and a mechanism that moves in the axial direction of the network tube. Furthermore, in order to change the strength of the magnetic field of the magnetic field type electronic lens over time, a circuit that supplies current to the solenoid coil is provided separately from the horizontal deflection circuit, which has the disadvantage of requiring a large number of parts and high power consumption. be.
本発明は永久磁石で作る主磁界と２系統のソレ
ノイドコイルで作る補助磁界との磁界分布のピー
クをほぼ一致させ、更にスイツチ式の水平偏向回
路に流れている電流を各ソレノイドコイルに流す
ようにして、補助磁界を水平期間でＶ字型に変化
させ、水平偏向に同期してダイナミツク集束を行
い上記欠点を解消するものである。 The present invention makes the peaks of the magnetic field distribution of the main magnetic field created by a permanent magnet and the auxiliary magnetic field created by two systems of solenoid coils almost match, and furthermore, the current flowing through the switch type horizontal deflection circuit is made to flow through each solenoid coil. In this way, the auxiliary magnetic field is changed in a V-shape in the horizontal period, and dynamic focusing is performed in synchronization with the horizontal deflection to eliminate the above-mentioned drawbacks.
以下図面をもとに本発明の一実施例を詳細に説
明する。図中、第１図と同一部分には同一番号を
付し説明を略す。 An embodiment of the present invention will be described in detail below based on the drawings. In the figure, parts that are the same as those in FIG. 1 are given the same numbers and explanations will be omitted.
第３図は本発明による磁界型電子レンズの構造
を示すものである。電子レンズは主磁界を形成す
る永久磁石ポールピース３１と磁界を集中させる
ヨーク３２、補助磁界を形成するコイルの巻枠３
３、水平偏向に同期してビームをダイナミツクに
集束させるソレノイドコイル３４，３５および垂
直偏向に同期してビームをダイナミツクに集束さ
せかつ直流磁界を発生させるソレノイドコイル３
６から成つている。ここでソレノイドコイル３
４，３５は、後述する波形の電流が流れた時に発
生する磁界が、ネツク管の電子ビームが通過する
軸上付近で水平走査期間中でＶ字波形に変化する
ように、相互インダクタンスがほぼ−１になるよ
うに巻いてある。 FIG. 3 shows the structure of a magnetic field type electron lens according to the present invention. The electron lens includes a permanent magnet pole piece 31 that forms a main magnetic field, a yoke 32 that concentrates the magnetic field, and a coil winding frame 3 that forms an auxiliary magnetic field.
3. Solenoid coils 34 and 35 that dynamically focus the beam in synchronization with the horizontal deflection, and solenoid coil 3 that dynamically focuses the beam in synchronization with the vertical deflection and generates a DC magnetic field.
It consists of 6. Here, solenoid coil 3
4 and 35 have a mutual inductance of approximately - so that the magnetic field generated when a current with a waveform described later flows changes into a V-shaped waveform during the horizontal scanning period near the axis through which the electron beam of the network tube passes. It is wound so that it becomes 1.
一般に磁界型電子レンズのレンズ作用１／ｆは、
軸上において軸方向の磁束密度分布Bz(z)、電子
の加速電圧Va、電子の電荷ｅ、電子の質量ｍと
すると
１／ｆ＝ｅ／8mVa∫+∞ -∞B2z(z)dz
で与えられる。磁界分布がベル型分布の永久磁石
から作られる主磁界の項とソレノイドコイルから
作られる補助磁界の２つの項から次に式で与えら
れるとすると、
Bz(z)＝Bp／１＋（Ｚ−Zpo／Zpa）2
＋Bs／１＋（Ｚ−Zso／Zsa）2
（ここにZpo、Zsoは各々の磁界の中心座標、
Zpa、Zsaは各々の磁界のレンズの巾、Bp、Bsは
各々の磁界のピーク値で、一般にBp≫Bsであ
る。）
２つの磁界分布の巾がほぼ等しくYpa＝Zps＝
ａで、２つの分布の中心が一致する時、レンズ作
用は
１／ｆ＝πae／16mVa（B2 p＋（√2）2）
となり、同じ２つの分布の中心が十分離れている
時には
１／ｆ＝πae／16mVa（B2 p＋B2 s）
となる。この２つのレンズ作用を表わす式を比較
してわかるように、２つのレンズの中心を一致さ
せた時、お互いの磁界が相互作用することにより
補正項のレンズ作用が一番大きくなることがわか
る。従つて第３図に示すように、集中ヨーク３２
の中心と、ソレノイドコイル３４，３５，３６の
中心をほぼ一致させるよう、ソレノイドコイルを
永久磁石レンズの内側に同心状に巻くことによ
り、小さな補助磁界で大きな補助のレンズ作用を
させることができる。 In general, the lens action 1/ f of a magnetic field type electron lens is as follows: 1/f=e/ It is given by 8mVa∫ +∞ -∞ B 2 z (z) dz. Assuming that the magnetic field distribution is given by the following two terms: the main magnetic field created by the permanent magnet with a bell-shaped distribution and the auxiliary magnetic field created by the solenoid coil, then Bz (z) = Bp/1 + (Z-Zpo /Zpa) 2 +Bs/1+(Z-Zso/Zsa) 2 (Here, Zpo and Zso are the center coordinates of each magnetic field,
Zpa and Zsa are the lens widths of each magnetic field, Bp and Bs are the peak values of each magnetic field, and generally Bp≫Bs. ) The widths of the two magnetic field distributions are almost equal, Ypa=Zps=
When the centers of the two distributions coincide at a, the lensing effect is 1/f=πae/16mVa (B 2 p + (√2) 2 ), and when the centers of the same two distributions are sufficiently far apart, the lensing effect is 1/f=πae/16mVa (B 2 p + (√2) 2 ). f=πae/16mVa (B 2 p +B 2 s ). As can be seen by comparing the equations expressing these two lens actions, it can be seen that when the centers of the two lenses are made to coincide, the lens action of the correction term becomes the largest due to the interaction of their magnetic fields. Therefore, as shown in FIG.
By winding the solenoid coils concentrically inside the permanent magnet lens so that the centers of the solenoid coils 34, 35, and 36 almost coincide with each other, a large auxiliary lens action can be achieved with a small auxiliary magnetic field.
第４図Ａは、第３図において、電子ビームを水
平方向に偏向するための電流を偏向ヨークに供給
する水平偏向回路を示したものであり、図では特
に、トランジスタを用いたスイツチ方式の水平偏
向回路を示している。スイツチトランジスター４
１のベースにコレクタ電流を遮断、導通させるド
ライブ信号を印加することにより、水平走査期間
の後半にはトランジスタ４１および水平偏向ヨー
ク４４を流れる電流は第４図Ｂの(i)に示すような
のこぎり波形の電流となり、水平走査期間の前半
には共振用のコンデンサ４３からの電磁界エネル
ギーが一旦水平偏向ヨーク４４に戻つた後ダンパ
ーダイオード４２を通つて消費され、この時ダン
パーダイオード４２および水平偏向ヨーク４４を
流れる電流は第４図Ｂののようなのこぎり波形
の電流となり、従つて水平偏向ヨーク４４の電流
および電圧波形は同図Ｂの，のようになる。 Figure 4A shows the horizontal deflection circuit in Figure 3 that supplies current to the deflection yoke for horizontally deflecting the electron beam. The deflection circuit is shown. switch transistor 4
By applying a drive signal to the base of the transistor 41 to cut off or conduct the collector current, the current flowing through the transistor 41 and the horizontal deflection yoke 44 is reduced to a sawtooth level as shown in FIG. 4B (i) in the latter half of the horizontal scanning period. The electromagnetic field energy from the resonance capacitor 43 returns to the horizontal deflection yoke 44 and then is consumed through the damper diode 42 during the first half of the horizontal scanning period. The current flowing through the horizontal deflection yoke 44 has a sawtooth waveform as shown in FIG.
次に、従来の磁界型電子レンズでは、水平偏向
に同期してダイナミツク集束を行うためのソレノ
イドコイルに流す電流は、第４図に示した水平偏
向回路と別に設けた回路より供給していたが、ダ
イナミツク集束用の補助磁界を作るためのソレノ
イドコイルで消費される電力はインダクタンスに
よる成分と抵抗による成分よりなり、このうち抵
抗による成分は実際に消費される有効成分である
ため出来るだけ少くすることが必要である。しか
し、抵抗分を少くするためコイルの巻数を少くす
ると、同時にインダクタンスも少くなり、必要と
する電流が大きくなる。従つてダイナミツク集束
に必要なコイルに流すパラボラ波形の電流を発生
させるために回路を別に作ることは、部品が多く
なるばかりでなく消費電力も多くなるという欠点
を有している。 Next, in conventional magnetic field type electron lenses, the current flowing through the solenoid coil for dynamic focusing in synchronization with horizontal deflection is supplied from a circuit provided separately from the horizontal deflection circuit shown in Figure 4. The power consumed by the solenoid coil for creating the auxiliary magnetic field for dynamic focusing consists of an inductance component and a resistance component. Of these, the resistance component is the active component that is actually consumed, so it should be minimized as much as possible. is necessary. However, if the number of turns of the coil is reduced in order to reduce the resistance, the inductance will also decrease, and the required current will increase. Therefore, creating a separate circuit to generate a parabolic waveform current to be passed through the coil necessary for dynamic focusing has the disadvantage of not only increasing the number of components but also increasing power consumption.
このため第５図Ａ及びＢに示した回路では、第
４図Ａに示した水平偏向回路とダイナミツク集束
用の回路とを共用することにより、上記欠点を解
決している。すなわち、スイツチ式の水平偏向回
路で発生しているトランジスタ４１を流れるのこ
ぎり波形の電流をソレノイドコイル３４に、ダン
パーダイオード４２に流れるのこぎり波形の電流
をソレノイドコイル３５に流すことにより、コイ
ル３４，３５で発生する合成磁界は第４図Ｂの
のように水平偏向に従つてＶ字型に変化し、ほぼ
パラボラ状の補助磁界を形成することができる。 Therefore, in the circuits shown in FIGS. 5A and 5B, the above-mentioned drawbacks are solved by sharing the horizontal deflection circuit shown in FIG. 4A and the dynamic focusing circuit. That is, by passing a sawtooth waveform current flowing through the transistor 41 generated in a switch type horizontal deflection circuit to the solenoid coil 34 and a sawtooth waveform current flowing through the damper diode 42 to the solenoid coil 35, the coils 34 and 35 The generated composite magnetic field changes in a V-shape according to the horizontal deflection, as shown in FIG. 4B, and can form an approximately parabolic auxiliary magnetic field.
以上説明したように本発明では、永久磁石によ
る電子レンズの磁界分布のピークとソレノイドコ
イルによる磁界分布のピークとをほぼ一致させる
ことにより総合的な磁界型電子レンズの強さをダ
イナミツクに変化させ、スポツトの走査に伴ない
螢光面で最適なスポツトを得るようにし、更に水
平偏向回路に流れている大電流を互に逆の極性に
巻いた二系統以上の低インダクタンスの補助コイ
ルに供給することにより水平偏向に同期してダイ
ナミツク集束することができ、回路部品が少く、
かつ消費電力の少い磁界型電子レンズを提供でき
るものである。 As explained above, in the present invention, the overall strength of the magnetic field type electron lens is dynamically changed by making the peak of the magnetic field distribution of the electron lens due to the permanent magnet substantially coincide with the peak of the magnetic field distribution due to the solenoid coil. The optimum spot is obtained on the fluorescent surface as the spot is scanned, and the large current flowing in the horizontal deflection circuit is supplied to two or more systems of low-inductance auxiliary coils wound with opposite polarities. enables dynamic focusing in synchronization with horizontal deflection, requires fewer circuit components,
Moreover, it is possible to provide a magnetic field type electron lens with low power consumption.
第１図は、磁界型電子レンズを用いた陰極線管
の側面図、第２図は第１図の陰極線管における磁
界の分布を示す図、第３図は本発明による磁界型
電子レンズの断面図、第４図Ａは従来の水平偏向
回路を示す結線図、同Ｂはその波形図、第５図
Ａ，Ｂは本発明の一実施例における磁界レンズの
結線図である。
１……電子銃、２……電子レンズ、３……偏向
ヨーク、４……電子ビーム、３１……永久磁石ポ
ールピース、３２……ヨーク、３３……コイルの
巻枠、３４，３５，３６……ソレノイドコイル、
４１……スイツチトランジスタ、４２……ダンパ
ーダイオード、４３……共振用コンデンサ、４４
……水平偏向ヨーク。
FIG. 1 is a side view of a cathode ray tube using a magnetic field type electron lens, FIG. 2 is a diagram showing the distribution of the magnetic field in the cathode ray tube of FIG. 1, and FIG. 3 is a cross-sectional view of the magnetic field type electron lens according to the present invention. , FIG. 4A is a wiring diagram showing a conventional horizontal deflection circuit, FIG. 4B is a waveform diagram thereof, and FIGS. 5A and 5B are wiring diagrams of a magnetic field lens in an embodiment of the present invention. 1... Electron gun, 2... Electron lens, 3... Deflection yoke, 4... Electron beam, 31... Permanent magnet pole piece, 32... Yoke, 33... Coil winding frame, 34, 35, 36 ...Solenoid coil,
41... Switch transistor, 42... Damper diode, 43... Resonance capacitor, 44
...Horizontal deflection yoke.
Claims (1)
各々の磁界分布のピーク位置が略一致するように
配され、電子ビームの水平偏向に同期して、スイ
ツチ式の水平偏向回路のスイツチトランジスタを
流れるのこぎり波電流を一方のソレノイドコイル
に流し、前記水平偏向回路のダンパーダイオード
に流れるのこぎり波電流を他方のソレノイドコイ
ルに流し、前記２系統のソレノイドコイルで形成
される合成磁界を水平偏向に従つてＶ字型に変化
させることを特徴とする陰極線管用電子レンズ。1 A permanent magnet and two systems of solenoid coils are arranged so that the peak positions of their respective magnetic field distributions approximately coincide, and a sawtooth wave flows through the switch transistor of the switch-type horizontal deflection circuit in synchronization with the horizontal deflection of the electron beam. A current is passed through one solenoid coil, a sawtooth current flowing through the damper diode of the horizontal deflection circuit is passed through the other solenoid coil, and the composite magnetic field formed by the two solenoid coils is shaped into a V-shape according to the horizontal deflection. An electronic lens for cathode ray tubes that is characterized by being able to change into
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14793579A JPS5671261A (en) | 1979-11-14 | 1979-11-14 | Electron lens for cathode-ray tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14793579A JPS5671261A (en) | 1979-11-14 | 1979-11-14 | Electron lens for cathode-ray tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5671261A JPS5671261A (en) | 1981-06-13 |
| JPH0145701B2 true JPH0145701B2 (en) | 1989-10-04 |
Family
ID=15441385
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14793579A Granted JPS5671261A (en) | 1979-11-14 | 1979-11-14 | Electron lens for cathode-ray tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5671261A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0728901U (en) * | 1993-08-24 | 1995-05-30 | 株式会社冨田屋 | Underwear for kimono |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6369462U (en) * | 1986-10-24 | 1988-05-10 | ||
| US5557164A (en) * | 1995-03-15 | 1996-09-17 | Chunghwa Picture Tubes, Ltd. | Cathode ray tube with misconvergence compensation |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5145883A (en) * | 1974-10-16 | 1976-04-19 | Toyo Boseki | Oobaareeruhoshiki nyoru hoseiyo nunojino hansoyokyaryasochi |
| JPS58658B2 (en) * | 1974-12-21 | 1983-01-07 | 株式会社東芝 | Ink Yokusen Kansouchi |
| JPS5316785U (en) * | 1976-07-23 | 1978-02-13 | ||
| JPS5337427U (en) * | 1976-09-06 | 1978-04-01 |
-
1979
- 1979-11-14 JP JP14793579A patent/JPS5671261A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0728901U (en) * | 1993-08-24 | 1995-05-30 | 株式会社冨田屋 | Underwear for kimono |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5671261A (en) | 1981-06-13 |
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