JPH0613001A - Electron lens - Google Patents
Electron lensInfo
- Publication number
- JPH0613001A JPH0613001A JP17595991A JP17595991A JPH0613001A JP H0613001 A JPH0613001 A JP H0613001A JP 17595991 A JP17595991 A JP 17595991A JP 17595991 A JP17595991 A JP 17595991A JP H0613001 A JPH0613001 A JP H0613001A
- Authority
- JP
- Japan
- Prior art keywords
- coil
- magnet
- layer portion
- layer part
- outer layer
- 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
Links
Landscapes
- Details Of Television Scanning (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、ブラウン管等の電子ビ
−ム制御に使用する磁石を装着した電子レンズに関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic lens equipped with a magnet used for controlling an electron beam such as a cathode ray tube.
【0002】[0002]
【従来の技術】従来、永久磁石を用いた電子レンズとし
て、図4に示すように両サイドのヨ−クとリング状又は
半割状の金属磁石(通常Alnico磁石)を組合せて
使用されている。しかし近時ブラウン管の大型化に伴
い、いわゆる磁束密度(図5に示す)の半値を大きくす
るために、発生N極とS極の距離を広げる必要が生じ、
そのために両サイドのヨ−ク間を複数個の金属磁石また
はヨ−クを積み重ねる手法が採られている。その手法の
ためスペ−スをそれだけ大きく取る必要がある上に、電
子レンズ総体として極度にコストアップになっていた。2. Description of the Related Art Conventionally, as an electron lens using a permanent magnet, as shown in FIG. 4, a yoke on both sides and a ring-shaped or half-divided metal magnet (usually Alnico magnet) are used in combination. . However, with the recent increase in the size of cathode ray tubes, in order to increase the half value of the so-called magnetic flux density (shown in FIG. 5), it is necessary to increase the distance between the generated N pole and S pole.
Therefore, a method of stacking a plurality of metal magnets or yokes between the yokes on both sides is adopted. Due to this method, the space must be increased so much, and the cost of the electron lens as a whole is extremely increased.
【0003】そしてこの手法の場合、通常は製作上の便
宜または渦電流ロスを少なくするために金属磁石を分割
し組立てている。このように分割し組立てると分割され
た各磁石間のバラツキや寸法誤差及び位置きめ誤差など
によってビ−ムの収束効果が不均等となり、収束後のビ
−ムスポットが真円にならず楕円の形状となる難点が生
じる。一方、金属磁石を分割せずに一体のリング状のま
ま使用すると、大きな渦電流ロスが発生し、使用された
交流の周波数によって電子レンズの特性が変りビ−ムの
収束効果が乱れてしまう欠点があった。In the case of this method, the metal magnets are usually divided and assembled for convenience of production or to reduce eddy current loss. When divided and assembled in this way, the beam converging effect becomes uneven due to variations among the divided magnets, dimensional errors, and position error, and the beam spot after convergence does not become a perfect circle but an elliptical shape. Difficulty in shape occurs. On the other hand, if the metal magnet is used as an integral ring without splitting, a large eddy current loss will occur, and the characteristics of the electron lens will change depending on the frequency of the AC used, and the beam converging effect will be disturbed. was there.
【0004】[0004]
【発明が解決しようとする課題】本発明は、従来のブラ
ウン管の大型化に伴う上記の実情に鑑みてなされたもの
で、比較的狭い限られたスペ−ス内において、特に磁束
密度(図5に示す)の半値幅を20mm程度以上に広げ
た電子レンズにおいて、ビ−ムスポットの形状を真円に
近づけるとともに、使用された交流の周波数によって特
性が変化しビ−ムの収束効果が乱れることのないように
する。そして実用に耐え得ようにダイナミックコイルの
インダクタンスの変化量を少なくし、鮮明な画像を得る
ための電子レンズを提供するものである。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances accompanying the increase in size of conventional cathode ray tubes, and particularly in a relatively narrow and limited space, the magnetic flux density (see FIG. 5). In an electron lens whose half-value width of (1) is widened to about 20 mm or more, the shape of the beam spot should be close to a perfect circle, and the characteristics should be changed depending on the frequency of the alternating current used to disturb the beam converging effect. Try not to. The present invention provides an electronic lens for obtaining a clear image by reducing the amount of change in the inductance of the dynamic coil so that it can be used practically.
【0005】[0005]
【課題を解決するための手段】上記課題を解決するため
に、本発明は、電子ビ−ムEが管内を通過するガラスバ
ルブネック1に装着したリング状電子レンズ2におい
て、全周を内層部Aと外層部Bとの2重構造とする。そ
の内層部Aまたは外層部Bのいずれか一方にはコイル
を、他方には永久磁石を各前後2個に分けて装着する。
前記コイルの前後いずれか一方には直流を通し、この直
流コイル4a側に金属磁石5を装着し、他方には100
KHz程度迄の高周波交流を通し、この交流コイル4b
側にプラスチック磁石6を装着するものである。In order to solve the above problems, the present invention provides a ring-shaped electron lens 2 mounted on a glass bulb neck 1 through which an electron beam E passes through the inside of a tube. It has a double structure of A and the outer layer portion B. A coil is attached to one of the inner layer portion A and the outer layer portion B, and two permanent magnets are attached to the other of the inner layer portion A and the outer layer portion B, respectively.
A direct current is passed through either one of the front and rear of the coil, the metal magnet 5 is mounted on the side of the direct current coil 4a, and the other side is 100
This alternating current coil 4b passes high frequency alternating current up to about KHz.
The plastic magnet 6 is attached to the side.
【0006】[0006]
【実施例】本発明を実施例に基づいて説明すると、図1
において、ガラスバルブネック1に電子レンズ2を装着
した状態を示し、その電子レンズ2の全周を内層部Aと
外層部Bとの2重構造とする。図2において、その電子
レンズ2の内層部Aにコイルをビ−ム発射方向前後2個
に分けて巻き付け、ビ−ム発射方向のコイル4aには直
流を通し、照射方向のコイル4bには高周波交流を通
す。そして外層部Bが磁気を発生させる部分で、前記コ
イルに対応してリング状の高周波交流を通す側にはプラ
スチック磁石6を、直流を通す側には金属磁石5を振分
けて装着する。そしてこの両者の中間にヨ−ク7を装着
する。また図3において、上記の電子レンズ2における
内層部Aと外層部Bを置き換えた態様を示し、図2と図
3のどちらにおいても作用、効果上同一傾向を示すので
以後図2の態様にて具体的説明を展開する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to FIG.
2 shows a state in which the electron lens 2 is attached to the glass bulb neck 1, and the entire circumference of the electron lens 2 has a double structure of an inner layer portion A and an outer layer portion B. In FIG. 2, a coil is separately wound around the inner layer A of the electron lens 2 in the front and rear of the beam emitting direction, a direct current is passed through the coil 4a in the beam emitting direction, and a high frequency is applied in the coil 4b in the emitting direction. Pass the exchange. Then, in the portion where the outer layer portion B generates magnetism, the ring-shaped high-frequency alternating current-side plastic magnets 6 and the direct-current-side side metal magnets 5 are distributed and mounted corresponding to the coils. Then, the yoke 7 is mounted between the two. Further, FIG. 3 shows a mode in which the inner layer portion A and the outer layer portion B of the electron lens 2 are replaced. In both of FIG. 2 and FIG. Develop specific explanations.
【0007】図2において、直流コイル(スタティック
コイル)4aは0.18mm径のポリウレタン銅線を6
30タ−ン巻いたもので、交流コイル(ダイナミックコ
イル)4bは0.35径のポリウレタン銅線を320タ
−ン巻いたものである。また永久磁石は外径が58m
m、内径48mm、厚み8mmのリング状磁石を用い、
一方のスタティックコイル4a側の永久磁石5はアルニ
コ系(Alnico8)の金属磁石とし、他方のダイナ
ミックコイル4a側の永久磁石6はアルニコ磁石の粉末
とポリアミド系樹脂並びに難燃剤とを混煉し、さらに磁
場中成形にて作製されたリング状のプラスチック磁石6
とする。この電子レンズ2のZ軸方向の磁束密度分布を
図5に示す。従来の技術においては、この磁束密度の半
値幅を20mm程度以上に広げるとビ−ムスポットの形
が楕円状になり、かつ使用された交流の周波数によって
特性が変化し図7の(イ)のようにビ−ムの収束効果が
乱れる。しかし、本発明においてはリング状磁石を用い
るため、ビ−ムスポットの形状が図7の(ロ)に示すよ
うに真円となり極めて良好に現れる。In FIG. 2, the DC coil (static coil) 4a is made of polyurethane copper wire having a diameter of 0.18 mm.
The AC coil (dynamic coil) 4b is wound by 30 turns, and is formed by winding 320 turns of polyurethane copper wire having a diameter of 0.35. The outer diameter of the permanent magnet is 58m.
m, an inner diameter of 48 mm, a thickness of 8 mm ring magnet,
The permanent magnet 5 on one static coil 4a side is an Alnico type (Alnico 8) metal magnet, and the permanent magnet 6 on the other dynamic coil 4a side is a mixture of an alnico magnet powder, a polyamide type resin, and a flame retardant. Ring-shaped plastic magnet 6 manufactured by magnetic field molding
And The magnetic flux density distribution in the Z-axis direction of this electron lens 2 is shown in FIG. In the prior art, when the half-value width of the magnetic flux density is expanded to about 20 mm or more, the beam spot becomes elliptical, and the characteristics change depending on the frequency of the alternating current used. Thus, the beam convergence effect is disturbed. However, in the present invention, since the ring-shaped magnet is used, the shape of the beam spot becomes a perfect circle as shown in FIG.
【0008】[0008]
【作用】本発明は上記構成であり、図4には従来の電子
レンズで金属磁石5を用いた一例が示されている。この
場合、金属磁石5は大型化するには通常半割に組立てて
用いられている。そしてその磁石の接続部から生じる磁
界の差異がビ−ムスポットの変形を生じさせ、ビ−ムス
ポットが真円にではなく楕円状に現れる。この従来技術
に対して本発明はリング状磁石であるため接続部による
磁界の差異がなくビ−ムスポットが真円に現れる。The present invention has the above-mentioned structure, and FIG. 4 shows an example in which the metal magnet 5 is used in the conventional electron lens. In this case, the metal magnet 5 is usually assembled in half and used for increasing the size. Then, the difference in the magnetic field generated from the connecting portion of the magnets causes the beam spot to be deformed, and the beam spot appears not in a perfect circle but in an elliptical shape. In contrast to this prior art, the present invention is a ring-shaped magnet, so that there is no difference in the magnetic field due to the connecting portion and the beam spot appears in a perfect circle.
【0009】高周波電流を通すダイナミックコイルに隣
接しいるプラスチック磁石は金属磁石の粉末がポリアミ
ド系樹脂等によって隔離されているため図6に示すよう
に従来の金属磁石(鋳造マグネットリング)を組込んだ
ものに比較すると、鋳造マグネットリングによるものが
周波数が上がるとインダクタンスが大幅に低下するのに
対して、本発明は100KHz程度迄の高周波域におい
てもダイナミックコイルのインダクタンスの変化量が非
常に少なく、実用に耐えられる範囲(1.0mH以上)
内に性能を保つことができる。The plastic magnet adjacent to the dynamic coil for passing the high frequency current has the conventional metal magnet (cast magnet ring) incorporated therein as shown in FIG. 6 because the powder of the metal magnet is separated by the polyamide resin or the like. Compared with the one, the one with a cast magnet ring has a large decrease in the inductance as the frequency increases, whereas the present invention has a very small change amount of the inductance of the dynamic coil even in the high frequency range up to about 100 KHz, and is practically used. Range that can withstand (1.0mH or more)
You can keep the performance within.
【0010】[0010]
【発明の効果】以上の構成であるので、従来の金属磁石
のみを組込んだものに比較してプラスチック磁石を用い
るのでダイナミックコイルのインダクタンスの変化量を
極めて少なくできる。また、リング状磁石を用いるの
で、ビ−ムスポットが分割磁石のような接続部から生じ
る磁界の差異による変形が現われず、殆ど真円になり、
極めて良好で鮮明な画像を得ることができる。さらに、
コストの高い大型の永久磁石を使用しないので製作費を
著しく削減でき、かつ限られたスペ−ス内にコンパクト
に収納することができる。With the above construction, since the plastic magnet is used as compared with the conventional one incorporating only the metal magnet, the variation amount of the inductance of the dynamic coil can be extremely reduced. Further, since the ring-shaped magnet is used, the beam spot does not appear to be deformed due to the difference in the magnetic field generated from the connecting portion such as the split magnet, and becomes almost a perfect circle.
An extremely good and clear image can be obtained. further,
Since a large costly large permanent magnet is not used, the manufacturing cost can be remarkably reduced and the compact space can be stored in a limited space.
【図1】本発明の使用状態を示す縦断側面図。FIG. 1 is a vertical cross-sectional side view showing a usage state of the present invention.
【図2】本発明の使用状態を示し、(イ)が縦断側面図
で、(ロ)が正面図。FIG. 2 shows a use state of the present invention, (a) is a vertical side view, and (b) is a front view.
【図3】本発明の別の態様を示す縦断側面図。FIG. 3 is a vertical sectional side view showing another embodiment of the present invention.
【図4】従来品の使用状態を示す縦断側面図。FIG. 4 is a vertical cross-sectional side view showing a usage state of a conventional product.
【図5】本発明の磁束密度分布図。FIG. 5 is a magnetic flux density distribution diagram of the present invention.
【図6】周波数に対するインダクタンスを示す従来品と
の性能比較グラフ図。FIG. 6 is a performance comparison graph diagram showing inductance with respect to frequency with a conventional product.
【図7】ビ−ムスポットの形状を示し、(イ)が半割り
磁石を用いた場合、(ロ)がリング状磁石を用いた場
合。FIG. 7 shows the shape of a beam spot, in which (a) uses a half magnet and (b) uses a ring magnet.
A 内層部 B 外層部 E 電子ビ−ム 1 ガラスバルブネック 2 電子レンズ 3 センタ−ヨ−ク 4 コイル 4a スタティックコイル 4b ダイナミックコイル 5 永久磁石 6 プラスチック磁石 7 継鉄 8 サイドヨ−ク 9 ボビン 10 磁束 11 カソ−ド 12 アノ−ド 13 グリッド A Inner layer portion B Outer layer portion E Electron beam 1 Glass bulb neck 2 Electron lens 3 Center yoke 4 Coil 4a Static coil 4b Dynamic coil 5 Permanent magnet 6 Plastic magnet 7 Yoke 8 Side yoke 9 Bobbin 10 Magnetic flux 11 Cathode 12 Anode 13 Grid
Claims (1)
ルブネック(1)に装着したリング状の電子レンズ
(2)において、全周を内層部Aと外層部Bとの2重構
造とし、その内層部Aまたは外層部Bのいずれか一方に
はコイルを、他方には永久磁石を各前後2個に分けて装
着し、前記コイルの前後いずれか一方には直流を通し、
この直流コイル(4a)側に金属磁石(5)を、他方に
は100KHz程度迄の高周波交流を通し、この交流コ
イル(4b)側にプラスチック磁石(6)を各振分けて
装着することを特徴とする電子レンズ。1. A ring-shaped electron lens (2) mounted on a glass bulb neck (1) through which an electron beam E passes through a tube, and has a double structure of an inner layer portion A and an outer layer portion B over the entire circumference. , A coil is attached to either one of the inner layer portion A or the outer layer portion B, and a permanent magnet is separately attached to the other of the front portion and the rear portion, respectively, and a direct current is passed through either of the front and rear portions of the coil.
A metal magnet (5) is passed through the DC coil (4a) side, a high frequency AC up to about 100 KHz is passed through the other side, and plastic magnets (6) are attached to the AC coil (4b) side in a distributed manner. Electronic lens to do.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17595991A JPH0613001A (en) | 1991-06-20 | 1991-06-20 | Electron lens |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17595991A JPH0613001A (en) | 1991-06-20 | 1991-06-20 | Electron lens |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0613001A true JPH0613001A (en) | 1994-01-21 |
Family
ID=16005253
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP17595991A Pending JPH0613001A (en) | 1991-06-20 | 1991-06-20 | Electron lens |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0613001A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100338428C (en) * | 2003-06-06 | 2007-09-19 | 国家摩托车质量监督检验中心(天津) | Measuring method for steering angle and torque of motorcycle steering wheel |
-
1991
- 1991-06-20 JP JP17595991A patent/JPH0613001A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100338428C (en) * | 2003-06-06 | 2007-09-19 | 国家摩托车质量监督检验中心(天津) | Measuring method for steering angle and torque of motorcycle steering wheel |
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