JPH01186540A - Electron gun - Google Patents

Electron gun

Info

Publication number
JPH01186540A
JPH01186540A JP63003727A JP372788A JPH01186540A JP H01186540 A JPH01186540 A JP H01186540A JP 63003727 A JP63003727 A JP 63003727A JP 372788 A JP372788 A JP 372788A JP H01186540 A JPH01186540 A JP H01186540A
Authority
JP
Japan
Prior art keywords
electrode
electron
electron gun
electron beam
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.)
Pending
Application number
JP63003727A
Other languages
Japanese (ja)
Inventor
Hiroki Sano
広樹 佐野
Yoichi Ose
洋一 小瀬
Kazuatsu Tago
一農 田子
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.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP63003727A priority Critical patent/JPH01186540A/en
Publication of JPH01186540A publication Critical patent/JPH01186540A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To remove the unnecessary portion of the magnetic field adversely affecting on the focusing and concentration of a beam by constituting part or all of electrodes of an electron gun with a superconducting material. CONSTITUTION:A deflecting yoke 6 to deflect an electron beam is installed around a funnel section 8 and forms the deflecting magnetic field 7. A thin film 11 made of a superconducting material is coated or deposited on the inner wall of a neck section so as to surround an electron gun, members 12 made of the superconducting material are fitted to the inner wall of a seal cup 4. These superconducting members 12 are fitted on lines passing nearly the centers between respective beam passing holes in the direction nearly perpendicular to a line connecting a center beam passing hole 15b and side beam passing holes 15a and 15c and the passing direction of the beam. Part of the deflecting magnetic field 7 formed by the deflecting yoke 6 can be prevented from infiltrating into a focusing electrode 3 or an accelerating electrode 4 by the superconducting members 12, and the Lorentz force by the deflecting magnetic field can be prevented from adversely affecting the beam shape during the focusing and acceleration of the beam.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、電極とそれに付帯する部材により構成され、
電極間の電位差を利用して電子ビームを発するいわゆる
電子銃に係り、特に磁界の悪影響を取り除くのに好適な
電子銃に関する。
[Detailed Description of the Invention] [Industrial Application Field] The present invention comprises an electrode and members attached thereto,
The present invention relates to a so-called electron gun that emits an electron beam using a potential difference between electrodes, and particularly to an electron gun suitable for eliminating the adverse effects of a magnetic field.

〔従来の技術〕[Conventional technology]

従来カラーブラウン管などでは、第2図に示すように、
カソード1より出射した3本の電子ビームを集束加速す
るための電極系2,3を持ち1図示しないガラス支持材
により電極間を支持し、電子銃全体は最後段部の電極で
あるシールドカップ4によりブラウン管のスクリーンに
略垂直方向に伸びるネック部8に配設された電子銃10
を備えている。また実公昭55−9163号公報に記載
のように、前記ネック部8からスクリーン5にかけて略
ラッパもしくは漏斗状に拡がるファンネル部9に配置さ
れた、電子ビームを偏向走査するための偏向ヨーク6に
よって形成される偏向磁界7の一部が前言ピシールドカ
ップに及んでいる。この磁界を第3図に示すようにシー
ルドカップに設けられた3本のビームに対応して設けら
れた電子ビーム通過孔15a、15cのまわりに高速磁
率材よりなる磁性体20a〜20dを設け、センタービ
ーム通過孔付近でサイドビーム通過孔付近よりも強くな
るように制御し、3本のビームのスクリーン」−での集
中を得ている。
In conventional color cathode ray tubes, as shown in Figure 2,
It has an electrode system 2 and 3 for focusing and accelerating the three electron beams emitted from the cathode 1.1 The electrodes are supported by a glass support material (not shown), and the entire electron gun is a shield cup 4 which is the last stage electrode. An electron gun 10 is disposed in a neck portion 8 extending substantially perpendicularly to the screen of the cathode ray tube.
It is equipped with Further, as described in Japanese Utility Model Publication No. 55-9163, it is formed by a deflection yoke 6 for deflecting and scanning the electron beam, which is disposed in a funnel section 9 that extends from the neck section 8 to the screen 5 in a substantially trumpet or funnel shape. A part of the deflection magnetic field 7 that is applied extends to the pishield cup. As shown in FIG. 3, magnetic bodies 20a to 20d made of a high-speed magnetic material are provided around electron beam passing holes 15a and 15c provided corresponding to the three beams provided in the shield cup, as shown in FIG. It is controlled so that the strength near the center beam passage hole is stronger than that near the side beam passage hole, and the concentration of the three beams on the screen is achieved.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

上記従来技術は、偏向磁界の集束・加速電極への漏れや
、また大画面化した場合の高速偏向磁界により、シール
ドカップに生じる渦電流の影響については配慮されてい
ない。
The above-mentioned conventional technology does not take into account the leakage of the deflection magnetic field to the focusing/accelerating electrode, or the influence of eddy currents generated in the shield cup due to the high-speed deflection magnetic field when the screen is enlarged.

例えば、集束、加速電極中に漏れ出る磁界は。For example, the magnetic field leaks into the focusing and accelerating electrodes.

1本1本の電子ビームの集束を悪化させ、3本の電子ビ
ームの集中誤差を増大させる。またシールドカップに発
生した渦電流はセンタービームまわりに強められていた
磁界を減磁する方向に磁界を発生し、ビームの集中誤差
を増大させるなどの問題があった。
This worsens the focusing of each electron beam and increases the focusing error of the three electron beams. In addition, the eddy current generated in the shield cup generates a magnetic field in a direction that demagnetizes the magnetic field that had been strengthened around the center beam, resulting in problems such as increased beam concentration errors.

本発明の目的はこれらのビームの集束、集中に悪影響を
及ぼす磁界を低減、防止することにある。
An object of the present invention is to reduce or prevent magnetic fields that adversely affect the focusing and concentration of these beams.

(課題を解決するための手段〕 上記目的は、電子銃の電極の一部、電極を支持するガラ
ス支持部の一部または、ガラス管ネックなどの一部を、
超電導材料↓こより構成することにより達成される。
(Means for Solving the Problems) The above object is to fix a part of the electrode of an electron gun, a part of the glass support part that supports the electrode, or a part of the glass tube neck, etc.
This is achieved by arranging superconducting materials.

〔作用〕[Effect]

すなわち、超電導材料は磁場を完全にシールドする。こ
れによって磁界の必要部分と不要部分とを選択し、不要
部分についてはシールドする構造とすることが可能とな
る。したがって磁界のビームへの悪影響を取り除くこと
ができる。
That is, superconducting materials completely shield magnetic fields. This makes it possible to select the necessary and unnecessary parts of the magnetic field, and to create a structure in which the unnecessary parts are shielded. Therefore, the negative influence of the magnetic field on the beam can be removed.

〔実施例〕〔Example〕

以下本発明の一実施例を第1図により説明する。 An embodiment of the present invention will be described below with reference to FIG.

第1図において、電子銃10は3本の電子ビームを出射
するカソード1と、出射されたビームを集束するための
集束電極2と、加速するための加速電極3と、これに接
続するシールドカップ4と、図示しないガラス支持部材
により電極は支持固定され、構成されている。またシー
ルドカップはガラス管よりなるネック部内壁8で支持さ
れ、電子銃10全体を支えている。またネック部内壁8
にはファンネル部9がラッパまたは漏斗状に接続し、さ
らに電子ビームが最終的に到達するスクリーンよりブラ
ウン管13を構成している。またファンネル部8のまわ
りには、電子ビームを偏向するための偏向ヨーク6が設
置され、偏向磁界7を形成している。上記電子銃のまわ
りを取り囲むように、ネック部内壁には超電導材料より
なる薄膜11が塗布または蒸着、もしくは埋設されるな
どして存在しており、またシールカップ内壁には、超電
導材料よりなる部材が取り付けられている。
In FIG. 1, an electron gun 10 includes a cathode 1 for emitting three electron beams, a focusing electrode 2 for focusing the emitted beams, an accelerating electrode 3 for accelerating the emitted beams, and a shield cup connected to the cathode 1. 4, the electrodes are supported and fixed by a glass support member (not shown). Further, the shield cup is supported by a neck inner wall 8 made of a glass tube, and supports the entire electron gun 10. Also, the inner wall of the neck part 8
A funnel portion 9 is connected in a trumpet or funnel shape, and a cathode ray tube 13 is constituted by a screen on which the electron beam finally reaches. Further, a deflection yoke 6 for deflecting the electron beam is installed around the funnel portion 8 to form a deflection magnetic field 7. A thin film 11 made of a superconducting material is coated, vapor-deposited, or buried on the inner wall of the neck portion so as to surround the electron gun, and a member made of a superconducting material is provided on the inner wall of the seal cup. is installed.

第4図にシールドカップのスクリーン側からみた正面図
を示し、前記超電導部材の位置・形状などを説明する。
FIG. 4 shows a front view of the shield cup as seen from the screen side, and the position, shape, etc. of the superconducting member will be explained.

すなわち、超電導部材12は、センタービーム通過孔1
5bとサイドビーム通過孔を結ぶラインおよび、ビーム
の通過方向とほぼ垂直をなす方向に、それぞれのビーム
通過孔中心間のほぼ中央を通るライン上に取り付けられ
ている。
That is, the superconducting member 12 has the center beam passage hole 1
5b and the side beam passage hole, and a line passing approximately at the center between the centers of the respective beam passage holes in a direction substantially perpendicular to the beam passage direction.

本発明によれば、第1図に示すようにネック部8の内壁
に塗付、蒸着もしくは埋設され超電導部材11により、
偏向ヨーク6が形成している偏向磁界7の一部が、集束
電極3または加速電極4に入れ込むのを防ぐことができ
、ビームの集束、加速中に偏向磁界によるローレンツ力
がビーム形状に悪影響することを防止できる。またこれ
により、従来偏向ヨーク6と電子銃10は、偏向磁界の
ビーム形状への悪影響を避けるため、ある程度の間隔を
必要としていたが1本発明の超電導材料被膜を用いるこ
とにより、この間隔を狭くでき、これによって電極系全
体を短くし、薄型のブラウン管を実現できる。なお超電
導材料はファンネル部内壁のみならず外壁に存在しても
よい。
According to the present invention, as shown in FIG.
A part of the deflection magnetic field 7 formed by the deflection yoke 6 can be prevented from entering the focusing electrode 3 or the accelerating electrode 4, and the Lorentz force caused by the deflection magnetic field can adversely affect the beam shape during beam focusing and acceleration. can be prevented from happening. In addition, as a result, conventionally the deflection yoke 6 and the electron gun 10 required a certain distance in order to avoid the adverse effect of the deflection magnetic field on the beam shape, but by using the superconducting material coating of the present invention, this distance can be narrowed. This allows the entire electrode system to be shortened and a thin cathode ray tube to be realized. Note that the superconducting material may be present not only on the inner wall of the funnel portion but also on the outer wall.

次に第5図に示すように、偏向磁界が生じる渦電流によ
る逆方きの磁界は、サイドビーム通過孔15a、15c
付近よりも、センタービーム通過孔15b付近で強く、
これにより、センタービームが高サイドビームより弱い
偏向を受け、ビーム集中ずれを起こしているが、第4図
に示す実施例によれば、センタービーム通過孔付近に斜
め上方からはいり込む磁界を防ぐことができ、3本の電
子ビームに対する渦電流による磁界の影響を同等とする
ことによって、ビームの集中ずれを防ぐことができる。
Next, as shown in FIG. 5, the magnetic field in the opposite direction due to the eddy current that generates the deflection magnetic field is generated by the side beam passing holes 15a and 15c.
It is stronger near the center beam passage hole 15b than in the vicinity,
As a result, the center beam is deflected weaker than the high side beams, causing a beam concentration shift. However, according to the embodiment shown in FIG. 4, magnetic fields can be prevented from entering the vicinity of the center beam passage hole from diagonally above. By equalizing the influence of the magnetic field caused by the eddy current on the three electron beams, it is possible to prevent beam concentration deviation.

また第6図に本発明の第2の実施例を示す。本発明の実
施例では、超電導材料よりなる部材として、上下2対の
板もしくは角柱材を使用している。
Further, FIG. 6 shows a second embodiment of the present invention. In the embodiment of the present invention, two pairs of upper and lower plates or prismatic members are used as members made of superconducting material.

これによれば、第1の実施例よりも製造がし易い効果が
ある。
According to this, there is an effect that manufacturing is easier than in the first embodiment.

さらに第3の実施例としては、第5図、第6図における
3本の電子ビーム通過孔の設けられているシールドカッ
プ底部の少なくとも一部を超電導材とすることにより、
シールドカップ底部を貫く磁界が、電子ビームの集束、
加速電極領域に入りこむことを防ぐことができ、良好な
集束、集中が得られる。
Furthermore, as a third embodiment, at least a part of the bottom of the shield cup in which the three electron beam passing holes in FIGS. 5 and 6 are provided is made of a superconducting material.
The magnetic field penetrating the bottom of the shield cup focuses the electron beam,
It is possible to prevent it from entering the accelerating electrode area, and good focusing and concentration can be obtained.

〔発明の効果〕〔Effect of the invention〕

本発明によれば、超電導材料を用いていることにより、
ビームの集束、集中に悪影響する磁界の不要部分を取り
除くことができる効果がある。
According to the present invention, by using a superconducting material,
This has the effect of removing unnecessary parts of the magnetic field that adversely affect beam focusing and concentration.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明の1実施例を示す電子銃の水平断面図、
第2図は従来の電子銃の1例を示す水平断面図、第3図
は従来の実施例のシールドカップの正面図、第4図は本
発明の1実施例のシールドカップの正面図、第5図は従
来のシールドカップに生じる渦電流及び、それによる磁
界の正面図、第6図は本発明の第2の実施例を示すシー
ルドカップ正面図。 1・・・カソード、2・・・集束電極、3・・・加速電
極、4・・・シールドカップ、5・・・スクリーン、6
・・・偏向ヨーク、7・・・偏向磁界、8・・・ネック
部、9・・・ファンネル部、10・・・電子銃、11・
・・超電導被膜、12・・・超電導部材、15・・・電
子ビーム通過孔、15a。 C・・・サイドビーム通過孔、15b・・・センタービ
ーム通過孔、20・・・高透磁率磁性体、30・・・′
Lfk電流。 31・・・渦電流が形成する磁界。 代理人 弁理士 小川層表/′。・ 1z−−−に電鼻同lへ
FIG. 1 is a horizontal sectional view of an electron gun showing one embodiment of the present invention;
FIG. 2 is a horizontal sectional view showing an example of a conventional electron gun, FIG. 3 is a front view of a shield cup of a conventional embodiment, and FIG. 4 is a front view of a shield cup of an embodiment of the present invention. FIG. 5 is a front view of eddy currents generated in a conventional shield cup and the resulting magnetic field, and FIG. 6 is a front view of a shield cup showing a second embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Cathode, 2... Focusing electrode, 3... Accelerating electrode, 4... Shield cup, 5... Screen, 6
... Deflection yoke, 7... Deflection magnetic field, 8... Neck part, 9... Funnel part, 10... Electron gun, 11...
...Superconducting coating, 12... Superconducting member, 15... Electron beam passage hole, 15a. C... Side beam passing hole, 15b... Center beam passing hole, 20... High permeability magnetic material, 30...'
Lfk current. 31...Magnetic field formed by eddy current. Agent: Patent Attorney Ogawa Hiroto/'.・ 1z---to the same electric nose l

Claims (1)

【特許請求の範囲】 1、少なくとも2枚の電極と、前記電極に電気的に接続
する部材により構成され、前記電極間には外部回路より
電位差が与えられ、前記電位差によつて少なくとも1枚
の電極より他の電極に向かつて電子ビームを出射する電
子銃において、前記電極の一部または全部を超電導材料
で構成したことを特徴とする電子銃。 2、前記電極に電気的に接続する部材の一部または全部
を超電導材料により構成したことを特徴とする特許請求
の範囲第1項記載の電子銃。 3、前記電極は電子ビームを放出する比較的電位の低い
カソードと、放出された電子ビームを集束するための中
間電位を持つ少なくとも1枚の格子電極と、前記のカソ
ードより放出された電子ビームを最終加速する比較的高
電位の加速電極と、前記加速電極に接続し、電子銃を前
記電極と電気的に接続する部材に支持する電極(シール
ドカップ)より構成され、前記電極と電気的に接続する
部材には、電子銃電極を支持するガラス部材と電子銃の
周囲を取りまくように設置されたガラス管ネック部と、
それに連なるフアンネル部と、電子ビームが最終的に到
達するスクリーンにより構成され、前記電子ビームは、
磁界を発生する偏向装置により偏向せしめる構成の電子
銃において、前記ガラス管ネック内壁の少なくとも一部
に超電導材料よりなる被膜を有していることを特徴とす
る特許請求の範囲第1項記載の電子銃。 4、前記カソードには、3本の電子ビームを出射し、各
集束電極、加速電極及びシールドカップには、3本の電
子ビームが通過するための3つの電子ビーム通過孔が設
けられている電子銃において、前記シールドカップの3
つの電子ビーム通過孔の並ぶ方向と、電子ビームの通過
する方向の双方に略垂直となるように、少なくとも1つ
以上の超電導材料よりなる部材が、センタビームの通過
孔とサイドビームの通過孔の略中心を通るライン上に設
置されていることを特徴とした特許請求の範囲第3項記
載の電子銃。 5、前記シールドカップの、3本のビームの通過孔を設
けた底部の少なくとも一部を超電導部材により構成する
特許請求の範囲第4項記載の電子銃。
[Scope of Claims] 1. Consisting of at least two electrodes and a member electrically connected to the electrodes, a potential difference is applied between the electrodes from an external circuit, and the potential difference causes at least one of the electrodes to be electrically connected to the electrodes. 1. An electron gun that emits an electron beam from an electrode toward another electrode, characterized in that part or all of the electrode is made of a superconducting material. 2. The electron gun according to claim 1, wherein part or all of the member electrically connected to the electrode is made of a superconducting material. 3. The electrodes include a cathode with a relatively low potential that emits an electron beam, at least one grid electrode that has an intermediate potential to focus the emitted electron beam, and a cathode that emits the electron beam. Consists of an accelerating electrode with a relatively high potential for final acceleration, and an electrode (shield cup) that is connected to the accelerating electrode and supported by a member that electrically connects the electron gun to the electrode, and is electrically connected to the electrode. The supporting members include a glass member that supports the electron gun electrode, a glass tube neck portion that is installed around the electron gun, and
It is composed of a funnel part connected to the funnel part and a screen where the electron beam finally reaches, and the electron beam is
In an electron gun configured to be deflected by a deflection device that generates a magnetic field, at least a portion of the inner wall of the glass tube neck has a coating made of a superconducting material. gun. 4. The cathode emits three electron beams, and each focusing electrode, accelerating electrode, and shield cup is provided with three electron beam passing holes for the three electron beams to pass through. In the gun, three of the shield cups
At least one member made of superconducting material is placed between the center beam passage hole and the side beam passage hole so as to be substantially perpendicular to both the direction in which the two electron beam passage holes are lined up and the direction in which the electron beam passes. The electron gun according to claim 3, wherein the electron gun is installed on a line passing approximately through the center. 5. The electron gun according to claim 4, wherein at least a part of the bottom portion of the shield cup provided with the three beam passage holes is made of a superconducting member.
JP63003727A 1988-01-13 1988-01-13 Electron gun Pending JPH01186540A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63003727A JPH01186540A (en) 1988-01-13 1988-01-13 Electron gun

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63003727A JPH01186540A (en) 1988-01-13 1988-01-13 Electron gun

Publications (1)

Publication Number Publication Date
JPH01186540A true JPH01186540A (en) 1989-07-26

Family

ID=11565308

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63003727A Pending JPH01186540A (en) 1988-01-13 1988-01-13 Electron gun

Country Status (1)

Country Link
JP (1) JPH01186540A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001099141A1 (en) * 2000-06-19 2001-12-27 Koninklijke Philips Electronics N.V. Color cathode ray tube and electron gun

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001099141A1 (en) * 2000-06-19 2001-12-27 Koninklijke Philips Electronics N.V. Color cathode ray tube and electron gun

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