JP2004214052A

JP2004214052A - Deflection yoke

Info

Publication number: JP2004214052A
Application number: JP2003000349A
Authority: JP
Inventors: Toru Yamazaki; 徹山崎; Tsutomu Sakoyama; 勉迫山; Manabu Asayama; 学浅山; Makoto Suzuki; 鈴木　　誠
Original assignee: Victor Company of Japan Ltd
Current assignee: Victor Company of Japan Ltd
Priority date: 2003-01-06
Filing date: 2003-01-06
Publication date: 2004-07-29
Also published as: KR20040063761A; KR100574579B1; TW200412605A

Abstract

<P>PROBLEM TO BE SOLVED: To provide a deflection yoke in which a horizontal misconvergence almost uniformly generated due to characteristics of a color-picture tube and a vertical deflection coil can be corrected beforehand in a state that a variable terminal of a variable resister is positioned at the middle point. <P>SOLUTION: In the vertical deflection coils 3, 4, parallel circuits of diodes 7, 8 and diodes 9, 10 connected in series so that the polarities may be reverse from each other are connected in parallel. Between a connecting point of the diodes 7, 8 and that of the diodes 9, 10, a series circuit of the variable resister 11 and fixed resisters 12, 13 is connected. Even if the variable terminal of the variable resister is made to be in the state positioned at the middle point, the horizontal misconvergence can be corrected because a resistance value of the fixed resisters 12, 13 are mutually made to be different . <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、インライン型カラー受像管に装着して電子ビームを偏向させる偏向ヨークに係り、特に、画面上下端の横線ミスコンバーゼンスを補正することができる偏向ヨークに関する。
【０００２】
【従来の技術】
インライン型カラー受像管の赤（Ｒ），緑（Ｇ），青（Ｂ）の電子ビームの内、図７（Ａ）に示すように、画面上下端において、破線で示すＢの横線が実線で示すＲの横線よりも下にずれたり、図７（Ｂ）に示すように、画面上下端において、破線で示すＢの横線が実線で示すＲの横線よりも上にずれたりする横線ミスコンバーゼンスが知られている。
【０００３】
この図７（Ａ），（Ｂ）に示す横線ミスコンバーゼンスを補正する偏向ヨークとして、図６に示すものがある。図６に示す従来の偏向ヨークは、特開平７−２１２７７７号公報（特許文献１）に記載されている。図６において、端子１，２間には、垂直偏向コイル３，４が直列に接続されている。端子１と垂直偏向コイル３との接続点には、抵抗５の一端が接続されており、端子２と垂直偏向コイル４との接続点には、抵抗６の一端が接続されている。
【０００４】
互いに極性が逆方向となるよう直列に接続されたダイオード７，８と、互いに極性が逆方向となるよう直列に接続されたダイオード９，１０とで並列回路が形成されている。ダイオード７とダイオード９とは極性が逆方向となっており、ダイオード８とダイオード１０とは極性が逆方向となっている。ダイオード７，９の接続点には、抵抗５の他端が接続されており、ダイオード８，１０の接続点には、抵抗６の他端が接続されている。さらに、ダイオード７，８の接続点とダイオード９，１０の接続点との間には可変抵抗１１が接続されており、可変抵抗１１の可変端子（摺動子）は垂直偏向コイル３，４の接続点に接続されている。
【０００５】
このように構成される図６の偏向ヨークにおいて、可変抵抗１１の可変端子の位置をダイオード７，８側またはダイオード９，１０に移動させることにより、図７（Ａ），（Ｂ）に示す横線ミスコンバーゼンスを補正することができる。
【０００６】
【特許文献１】
特開平７−２１２７７７号公報（第５−６頁、図５）
【０００７】
【発明が解決しようとする課題】
ところで、偏向ヨークは、偏向ヨークをカラー受像管に装着してディスプレイ装置メーカに販売するＩＴＣ（ＩｎｔｅｇｒａｔｅｄＴｕｂｅＣｏｍｐｏｎｅｎｔ）メーカに納入されたり、偏向ヨークをカラー受像管に装着し、この偏向ヨークを装着したカラー受像管を筐体に装着してディスプレイ装置とするディスプレイ装置メーカに納入されたりする。偏向ヨークをＩＴＣメーカやディスプレイ装置メーカに納入する際には、偏向ヨークを予め調整用のカラー受像管に装着してコンバーゼンス調整等の各種の調整を行った上で納入する。
【０００８】
図７（Ａ），（Ｂ）に示すような横線ミスコンバーゼンスは、偏向ヨークを装着するカラー受像管や、偏向ヨークの構成部品である垂直偏向コイル３，４の特性に起因してほぼ一様に発生するものと、個々のカラー受像管のばらつきに起因して発生するものとがある。前者のものは、ＩＴＣメーカやディスプレイ装置メーカに納入する前に、偏向ヨークメーカで予め補正（調整）しておくことが好ましい。後者のものは、個々のカラー受像管のばらつきに起因するものであるので、ＩＴＣメーカやディスプレイ装置メーカにて、偏向ヨークを個々のカラー受像管に装着した状態で補正（調整）することが必要となる。
【０００９】
本来であれば、図６に示す構成において、ＩＴＣメーカやディスプレイ装置メーカでの図７（Ａ），（Ｂ）に示す横線ミスコンバーゼンスを補正するためのコンバーゼンス調整前の状態では、可変抵抗１１の可変端子の位置を中央（中点）に設定し、垂直偏向コイル３，４にアンバランスな電流が流れないようにし、コンバーゼンス調整工程で必要に応じて可変抵抗１１を回して図７（Ａ），（Ｂ）に示す横線ミスコンバーゼンスを補正することが好ましい。
【００１０】
しかしながら、図６に示す従来の偏向ヨークにおいては、上述したカラー受像管や垂直偏向コイル３，４の特性に起因してほぼ一様に発生する横線ミスコンバーゼンスを補正するには、偏向ヨークメーカで可変抵抗１１の可変端子の位置を調整しておかなければならない。すると、偏向ヨークをＩＴＣメーカやディスプレイ装置メーカに納入する時点で、可変抵抗１１の可変端子が中点に位置せず、ＩＴＣメーカやディスプレイ装置メーカにとって好ましくない状態となってしまう。可変抵抗１１の可変端子の位置を予め移動させてしまうと、その移動させた側において、ＩＴＣメーカやディスプレイ装置メーカにおけるばらつき補正のための調整量が減ってしまうこととなる。
【００１１】
このように、図６に示す従来の偏向ヨークは、可変抵抗１１の可変端子を中点に位置させた状態で図７（Ａ），（Ｂ）に示す横線ミスコンバーゼンスを補正することができないという第１の問題点があった。また、図６に示す従来の偏向ヨークは、抵抗等の部品点数が多いという第２の問題点があった。
【００１２】
本発明はこのような問題点に鑑みなされたものであり、可変抵抗の可変端子を中点に位置させた状態で、カラー受像管や垂直偏向コイルの特性に起因してほぼ一様に発生する横線ミスコンバーゼンスを予め補正することができる偏向ヨークを提供することを第１の目的とする。また、より少ない部品点数で横線ミスコンバーゼンスを補正することができる偏向ヨークを提供することを第２の目的とする。
【００１３】
【課題を解決するための手段】
本発明は、上述した従来の技術の課題を解決するため、以下の（ａ）〜（ｃ）の偏向ヨークを提供する。
（ａ）インライン型カラー受像管に装着する偏向ヨークにおいて、第１及び第２の端子（１，２）と、前記第１及び第２の端子間に互いに直列に接続された第１及び第２の垂直偏向コイル（３，４）と、互いに極性が逆方向となるよう直列に接続された第１及び第２のダイオード（７，８）と、互いに極性が逆方向となるよう直列に接続された第３及び第４のダイオード（９，１０）とを有し、前記第１のダイオードと前記第３ダイオードとが互いに極性が逆方向となるよう接続され、前記第２のダイオードと前記第４ダイオードとが互いに極性が逆方向となるよう接続された並列回路と、可変抵抗（１１）とこの可変抵抗を挟む第１及び第２の固定抵抗（１２，１３）を有し、前記第１及び第２のダイオードの接続点と前記第３及び第４のダイオードの接続点との間に接続された直列回路とを備え、前記第１の端子と前記第１の垂直偏向コイルとの接続点は、抵抗を介することなく、前記第１のダイオードと前記第３ダイオードとの接続点に接続され、前記第２の端子と前記第２の垂直偏向コイルとの接続点は、抵抗を介することなく、前記第２のダイオードと前記第４ダイオードとの接続点に接続され、前記可変抵抗の可変端子は、前記第１及び第２の垂直偏向コイルの接続点に接続されていることを特徴とする偏向ヨーク。
（ｂ）インライン型カラー受像管に装着する偏向ヨークにおいて、第１及び第２の端子（１，２）と、前記第１及び第２の端子間に互いに直列に接続された第１及び第２の垂直偏向コイル（３，４）と、互いに極性が逆方向となるよう直列に接続された第１及び第２のダイオード（７，８）とこの第１及び第２のダイオードの間に設けられた第１及び第２の固定抵抗（１４，１５）とよりなる第１の直列回路と、互いに極性が逆方向となるよう直列に接続された第３及び第４のダイオード（９，１０）とこの第３及び第４のダイオードの間に設けられた第３及び第４の固定抵抗（１６，１７）とよりなる第２の直列回路とを有し、前記第１のダイオードと前記第３ダイオードとが互いに極性が逆方向となるよう接続され、前記第２のダイオードと前記第４ダイオードとが互いに極性が逆方向となるよう接続された並列回路と、前記第１及び第２の固定抵抗の接続点と前記第３及び第４の固定抵抗の接続点との間に接続された可変抵抗（１１）とを備え、前記第１の端子と前記第１の垂直偏向コイルとの接続点は、抵抗を介することなく、前記第１のダイオードと前記第３ダイオードとの接続点に接続され、前記第２の端子と前記第２の垂直偏向コイルとの接続点は、抵抗を介することなく、前記第２のダイオードと前記第４ダイオードとの接続点に接続され、前記可変抵抗の可変端子は、前記第１及び第２の垂直偏向コイルの接続点に接続されていることを特徴とする偏向ヨーク。
（ｃ）インライン型カラー受像管に装着する偏向ヨークにおいて、第１及び第２の端子（１，２）と、前記第１及び第２の端子間に互いに直列に接続された第１及び第２の垂直偏向コイル（３，４）と、互いに極性が逆方向となるよう直列に接続された第１及び第２のダイオード（７，８）と、互いに極性が逆方向となるよう直列に接続された第３及び第４のダイオード（９，１０）とを有し、前記第１のダイオードと前記第３ダイオードとが互いに極性が逆方向となるよう接続され、前記第２のダイオードと前記第４ダイオードとが互いに極性が逆方向となるよう接続された並列回路と、前記第１及び第２のダイオードの接続点と前記第３及び第４のダイオードの接続点との間に接続された可変抵抗（１１）と、一端が前記第１及び第２の垂直偏向コイルの接続点に接続され、他端が前記可変抵抗の可変端子に接続された固定抵抗（１８）とを備え、前記第１の端子と前記第１の垂直偏向コイルとの接続点は、抵抗を介することなく、前記第１のダイオードと前記第３ダイオードとの接続点に接続され、前記第２の端子と前記第２の垂直偏向コイルとの接続点は、抵抗を介することなく、前記第２のダイオードと前記第４ダイオードとの接続点に接続されていることを特徴とする偏向ヨーク。
【００１４】
【発明の実施の形態】
以下、本発明の偏向ヨークについて、添付図面を参照して説明する。図１は本発明の偏向ヨークの第１実施形態を示す回路図、図２は本発明の偏向ヨークによる作用を説明するための磁界と偏向力との関係を示す図、図３は本発明の偏向ヨークによる画面上での補正作用を説明するための図、図４は本発明の偏向ヨークの第２実施形態を示す回路図、図５は本発明の偏向ヨークの第３実施形態を示す回路図である。なお、図１，図４，図５において、図６と同一部分には同一符号が付してある。
【００１５】
＜第１実施形態＞
図１に示す第１実施形態は、上述した第１の問題点を解決し、第１の目的を達成するものである。図１において、端子１，２間には、垂直偏向コイル３，４が直列に接続されている。垂直偏向コイル３，４は、インライン型カラー受像管のネック部を挟むよう左右に配置される。互いに極性が逆方向となるよう直列に接続されたダイオード７，８と、互いに極性が逆方向となるよう直列に接続されたダイオード９，１０とで並列回路が形成されている。ダイオード７とダイオード９とは極性が逆方向となっており、ダイオード８とダイオード１０とは極性が逆方向となっている。
【００１６】
端子１と垂直偏向コイル３との接続点は、図６の従来例と異なり、抵抗を介することなく、ダイオード７，９の接続点に接続されており、端子２と垂直偏向コイル４との接続点は、図６の従来例と異なり、抵抗を介することなく、ダイオード８，１０の接続点に接続されている。さらに、ダイオード７，８の接続点とダイオード９，１０の接続点との間には、可変抵抗１１と、この可変抵抗１１を挟むよう、固定の抵抗１２，１３が直列に接続されている。可変抵抗１１の可変端子（摺動子）は垂直偏向コイル３，４の接続点に接続されている。
【００１７】
この図１に示す構成においては、可変抵抗１１の可変端子を中点に位置させた状態でも、抵抗１２，１３の抵抗値が互いに異なるよう、抵抗１２，１３それぞれの抵抗値を適宜に設定すると、垂直偏向コイル３，４にアンバランスな電流が流れる。これにより、可変抵抗１１の可変端子を中点に位置させた状態でも、図７（Ａ），（Ｂ）に示す横線ミスコンバーゼンスを補正することが可能となる。
【００１８】
ここで、抵抗１２，１３の抵抗値を抵抗１２＜抵抗１３と設定した場合について考える。カラー受像管の画面上側に偏向するとき、垂直偏向電流が図１の実線矢印方向に流れるとする。垂直偏向電流が実線矢印方向に流れると、ダイオード９，８がオン、ダイオード７，１０がオフとなる。
【００１９】
このとき、垂直偏向コイル３に並列接続されている抵抗値は、抵抗１３＋可変抵抗１１の可変端子よりも抵抗１３側となる。可変抵抗１１の可変端子は中点に位置しているので、抵抗１３＋（可変抵抗１１）／２となる。垂直偏向コイル４に並列接続されている抵抗値は、抵抗１２＋可変抵抗１１の可変端子よりも抵抗１２側、即ち、抵抗１２＋（可変抵抗１１）／２となる。抵抗１２＜抵抗１３であるので、垂直偏向コイル３，４に流れる電流を比較すると、垂直偏向コイル３＞垂直偏向コイル４となる。
【００２０】
この状態において、垂直偏向コイル３から発生する磁界をφ３、垂直偏向コイル４から発生する磁界をφ４とすると、垂直偏向磁界は、φ３＞φ４となる。この結果、図２（Ａ）に示すように、電子ビームＲ，Ｂに加わる偏向力ＦＲ，ＦＢは、ＦＲ＜ＦＢとなる。電子ビームＢに加わる偏向力ＦＢが電子ビームＲに加わる偏向力ＦＲよりも大きくなるため、図３（Ａ）に示すように、画面上端において、破線で示すＢの横線が実線で示すＲの横線よりも上側に偏向されることとなる。従って、図７（Ａ）に示す、画面上端において破線で示すＢの横線が実線で示すＲの横線よりも下にずれる横線ミスコンバーゼンスが補正される。
【００２１】
一方、カラー受像管の画面下側に偏向するとき、垂直偏向電流が図１の破線矢印方向に流れるとする。垂直偏向電流が破線矢印方向に流れると、ダイオード１０，７がオン、ダイオード８，９がオフとなる。
【００２２】
このとき、垂直偏向コイル３に並列接続されている抵抗値は、抵抗１２＋可変抵抗１１の可変端子よりも抵抗１２側、即ち、抵抗１２＋（可変抵抗１１）／２となる。垂直偏向コイル４に並列接続されている抵抗値は、抵抗１３＋可変抵抗１１の可変端子よりも抵抗１３側、即ち、抵抗１３＋（可変抵抗１１）／２となる。抵抗１２＜抵抗１３であるので、垂直偏向コイル３，４に流れる電流を比較すると、垂直偏向コイル３＜垂直偏向コイル４となる。
【００２３】
この状態において、垂直偏向磁界は、φ３＜φ４となる。この結果、図２（Ｂ）に示すように、電子ビームＲ，Ｂに加わる偏向力ＦＲ，ＦＢは、ＦＢ＜ＦＲとなる。電子ビームＲに加わる偏向力ＦＲが電子ビームＢに加わる偏向力ＦＢよりも大きくなるため、図３（Ｂ）に示すように、画面下端において、実線で示すＲの横線が破線で示すＢの横線よりも下側に偏向されることとなる。従って、図７（Ａ）に示す、画面下端において破線で示すＢの横線が実線で示すＲの横線よりも下にずれる横線ミスコンバーゼンスが補正される。
【００２４】
特に図示しないが、図１に示す構成において、抵抗１２，１３の抵抗値を抵抗１２＞抵抗１３と設定した場合には、以上の抵抗１２＜抵抗１３と設定した場合とは逆となり、図７（Ｂ）に示す横線ミスコンバーゼンスが補正されることとなる。
【００２５】
以上のように、図１に示す第１実施形態の偏向ヨークは、可変抵抗１１の可変端子を中点に位置させた状態で、カラー受像管や垂直偏向コイル３，４の特性に起因してほぼ一様に発生する横線ミスコンバーゼンスを予め補正することができる。よって、ＩＴＣメーカやディスプレイ装置メーカは、それぞれの偏向ヨークを個々のカラー受像管に装着した状態で、可変抵抗１１を調整することにより、個々のカラー受像管のばらつきに起因する横線ミスコンバーゼンスを補正すればよい。
【００２６】
なお、図６に示す従来例において、可変抵抗１１の可変端子を中点に位置させた状態で、抵抗５，６の抵抗値を異ならせた場合には、図８（Ａ），（Ｂ）に示すような、画面上下端において、破線で示すＢの横線が実線で示すＲの横線よりも内側（上下方向の中央側）にずれるか、外側（上下端部側）にずれる横線ミスコンバーゼンスが補正されるのみである。図６に示す従来例では、可変抵抗１１の可変端子を中点に位置させた状態で、図７（Ａ），（Ｂ）に示す横線ミスコンバーゼンスを補正することはできない。
【００２７】
＜第２実施形態＞
図４に示す第２実施形態も、上述した第１の問題点を解決し、第１の目的を達成するものである。図４において、端子１，２間には、垂直偏向コイル３，４が直列に接続されている。垂直偏向コイル３，４は、インライン型カラー受像管のネック部を挟むよう左右に配置される。ダイオード７，８とダイオード７，８の間に設けられた固定の抵抗１４，１５とよりなる直列回路と、ダイオード９，１０とダイオード９，１０の間に設けられた固定の抵抗１６，１７とよりなる直列回路と並列回路が形成されている。
【００２８】
ダイオード７，８は、互いに極性が逆方向となるよう直列に接続されており、ダイオード９，１０も、互いに極性が逆方向となるよう直列に接続されている。
ダイオード７とダイオード９とは極性が逆方向となっており、ダイオード８とダイオード１０とは極性が逆方向となっている。
【００２９】
端子１と垂直偏向コイル３との接続点は、図６の従来例と異なり、抵抗を介することなく、ダイオード７，９の接続点に接続されており、端子２と垂直偏向コイル４との接続点は、図６の従来例と異なり、抵抗を介することなく、ダイオード８，１０の接続点に接続されている。さらに、抵抗１４，１５の接続点と抵抗１６，１７の接続点との間には、可変抵抗１１が接続されている。可変抵抗１１の可変端子（摺動子）は垂直偏向コイル３，４の接続点に接続されている。
【００３０】
この図４に示す構成においても、可変抵抗１１の可変端子を中点に位置させた状態で、抵抗１４と抵抗１７の抵抗値が互いに異なるよう、また、抵抗１５と抵抗１６の抵抗値が互いに異なるよう、抵抗１４〜１７それぞれの抵抗値を適宜に設定すると、垂直偏向コイル３，４にアンバランスな電流が流れる。これにより、第１実施形態と同様、可変抵抗１１の可変端子を中点に位置させた状態でも、図７（Ａ），（Ｂ）に示す横線ミスコンバーゼンスを補正することが可能となる。
【００３１】
＜第３実施形態＞
図５に示す第３実施形態は、上述した第２の問題点を解決し、第２の目的を達成するものである。図５において、端子１，２間には、垂直偏向コイル３，４が直列に接続されている。垂直偏向コイル３，４は、インライン型カラー受像管のネック部を挟むよう左右に配置される。互いに極性が逆方向となるよう直列に接続されたダイオード７，８と、互いに極性が逆方向となるよう直列に接続されたダイオード９，１０とで並列回路が形成されている。ダイオード７とダイオード９とは極性が逆方向となっており、ダイオード８とダイオード１０とは極性が逆方向となっている。
【００３２】
端子１と垂直偏向コイル３との接続点は、図６の従来例と異なり、抵抗を介することなく、ダイオード７，９の接続点に接続されており、端子２と垂直偏向コイル４との接続点は、図６の従来例と異なり、抵抗を介することなく、ダイオード８，１０の接続点に接続されている。さらに、ダイオード７，８の接続点とダイオード９，１０の接続点との間には、可変抵抗１１が接続されている。垂直偏向コイル３，４の接続点には、固定の抵抗１８の一端が接続されており、抵抗１８の他端は、可変抵抗１１の可変端子（摺動子）に接続されている。
【００３３】
この第３実施形態の偏向ヨークは、可変抵抗１１の可変端子を中点に位置させた状態で図７（Ａ），（Ｂ）に示す横線ミスコンバーゼンスを補正することはできないが、図６の従来例と同様、可変抵抗１１の可変端子の位置をダイオード７，８側またはダイオード９，１０に移動させることにより、図７（Ａ），（Ｂ）に示す横線ミスコンバーゼンスを補正することができる。第３実施形態の偏向ヨークは、図６の従来例と比較して、抵抗を１つ減らすことができ、より少ない部品点数とすることができる。よって、省スペース及びコストダウンを図ることができる。
【００３４】
【発明の効果】
以上詳細に説明したように、本発明の偏向ヨークは、第１及び第２実施形態の構成により、可変抵抗の可変端子を中点に位置させた状態で、カラー受像管や垂直偏向コイルの特性に起因してほぼ一様に発生する横線ミスコンバーゼンスを予め補正することができる。また、第３実施形態の構成により、より少ない部品点数で横線ミスコンバーゼンスを補正することができる。
【図面の簡単な説明】
【図１】本発明の偏向ヨークの第１実施形態を示す回路図である。
【図２】本発明の偏向ヨークによる作用を説明するための磁界と偏向力との関係を示す図である。
【図３】本発明の偏向ヨークによる画面上での補正作用を説明するための図である。
【図４】本発明の偏向ヨークの第２実施形態を示す回路図である。
【図５】本発明の偏向ヨークの第３実施形態を示す回路図である。
【図６】従来例を示す回路図である。
【図７】横線ミスコンバーゼンスパターンを示す図である。
【図８】他の横線ミスコンバーゼンスパターンを示す図である。
【符号の説明】
１，２端子
３，４垂直偏向コイル
７〜１０ダイオード
１１可変抵抗
１２〜１８固定抵抗[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a deflection yoke mounted on an in-line type color picture tube to deflect an electron beam, and more particularly to a deflection yoke capable of correcting a horizontal line misconvergence at the upper and lower ends of a screen.
[0002]
[Prior art]
Of the red (R), green (G), and blue (B) electron beams of the in-line type color picture tube, as shown in FIG. As shown in FIG. 7 (B), the horizontal line misconvergence in which the horizontal line of B indicated by a broken line deviates above the horizontal line of R indicated by a solid line, as shown in FIG. Are known.
[0003]
FIG. 6 shows a deflection yoke for correcting the horizontal misconvergence shown in FIGS. 7A and 7B. The conventional deflection yoke shown in FIG. 6 is described in Japanese Patent Application Laid-Open No. 7-21777 (Patent Document 1). In FIG. 6, vertical deflection coils 3 and 4 are connected in series between terminals 1 and 2. One end of a resistor 5 is connected to a connection point between the terminal 1 and the vertical deflection coil 3, and one end of a resistor 6 is connected to a connection point between the terminal 2 and the vertical deflection coil 4.
[0004]
A parallel circuit is formed by diodes 7 and 8 connected in series so that the polarities are opposite to each other, and diodes 9 and 10 connected in series so that the polarities are opposite to each other. The diode 7 and the diode 9 have opposite polarities, and the diode 8 and the diode 10 have opposite polarities. The other end of the resistor 5 is connected to a connection point between the diodes 7 and 9, and the other end of the resistor 6 is connected to a connection point between the diodes 8 and 10. Further, a variable resistor 11 is connected between the connection point of the diodes 7 and 8 and the connection point of the diodes 9 and 10, and the variable terminal (slider) of the variable resistor 11 is connected to the vertical deflection coils 3 and 4. Connected to a connection point.
[0005]
By moving the position of the variable terminal of the variable resistor 11 to the diodes 7 and 8 or the diodes 9 and 10 in the deflection yoke of FIG. 6 configured as described above, the horizontal lines shown in FIGS. Misconvergence can be corrected.
[0006]
[Patent Document 1]
JP-A-7-21777 (pages 5-6, FIG. 5)
[0007]
[Problems to be solved by the invention]
By the way, the deflection yoke is delivered to an ITC (Integrated Tube Component) maker which sells the deflection yoke to a color picture tube and sells it to a display device maker, or the deflection yoke is fitted to the color picture tube and the deflection yoke is mounted. A color picture tube is mounted on a housing and delivered to a display device maker to be used as a display device. When a deflection yoke is delivered to an ITC maker or a display device maker, the deflection yoke is mounted on a color picture tube for adjustment in advance and adjusted after various adjustments such as convergence adjustment.
[0008]
The horizontal misconvergence shown in FIGS. 7A and 7B is substantially uniform due to the characteristics of the color picture tube on which the deflection yoke is mounted and the vertical deflection coils 3 and 4 which are components of the deflection yoke. Some of them occur due to variations in individual color picture tubes. The former is preferably corrected (adjusted) in advance by a deflection yoke maker before being delivered to an ITC maker or a display device maker. The latter is caused by the dispersion of individual color picture tubes, so it is necessary for ITC manufacturers and display device manufacturers to correct (adjust) with the deflection yoke attached to each color picture tube. It becomes.
[0009]
Originally, in the configuration shown in FIG. 6, before the convergence adjustment for correcting the horizontal misconvergence shown in FIGS. 7A and 7B by the ITC maker or the display device maker, the variable resistor 11 The position of the variable terminal is set at the center (middle point) so that unbalanced current does not flow through the vertical deflection coils 3 and 4, and the variable resistor 11 is turned if necessary in the convergence adjustment step to obtain the state shown in FIG. , (B) is preferably corrected.
[0010]
However, in the conventional deflection yoke shown in FIG. 6, in order to correct the horizontal line misconvergence that occurs almost uniformly due to the characteristics of the color picture tube and the vertical deflection coils 3 and 4, the deflection yoke maker needs to correct it. The position of the variable terminal of the variable resistor 11 must be adjusted. Then, when the deflection yoke is delivered to the ITC maker or the display device maker, the variable terminal of the variable resistor 11 is not located at the middle point, which is unfavorable for the ITC maker or the display device maker. If the position of the variable terminal of the variable resistor 11 is moved in advance, the amount of adjustment for the variation correction by the ITC maker or the display device maker will be reduced on the moved side.
[0011]
As described above, the conventional deflection yoke shown in FIG. 6 cannot correct the horizontal misconvergence shown in FIGS. 7A and 7B when the variable terminal of the variable resistor 11 is located at the middle point. There was a first problem. Further, the conventional deflection yoke shown in FIG. 6 has a second problem that the number of components such as resistors is large.
[0012]
The present invention has been made in view of such a problem, and occurs almost uniformly due to characteristics of a color picture tube and a vertical deflection coil in a state where a variable terminal of a variable resistor is located at a middle point. A first object is to provide a deflection yoke capable of correcting horizontal misconvergence in advance. It is a second object of the present invention to provide a deflection yoke that can correct horizontal line misconvergence with a smaller number of components.
[0013]
[Means for Solving the Problems]
The present invention provides the following deflection yokes (a) to (c) in order to solve the above-mentioned problems of the related art.
(A) In a deflection yoke to be mounted on an in-line type color picture tube, first and second terminals (1, 2) and first and second terminals connected in series between the first and second terminals. And the first and second diodes (7, 8) connected in series so that the polarities are opposite to each other, and connected in series so that the polarities are opposite to each other. Third and fourth diodes (9, 10), the first diode and the third diode are connected so that the polarities thereof are opposite to each other, and the second diode and the fourth diode are connected to each other. A variable resistance (11) and first and second fixed resistances (12, 13) sandwiching the variable resistance; The connection point of the second diode and the third and fourth A series circuit connected between the first diode and the first vertical deflection coil, without connecting a resistor between the first terminal and the first vertical deflection coil. 3 is connected to a connection point with the diode, and a connection point between the second terminal and the second vertical deflection coil is connected to a connection point between the second diode and the fourth diode without through a resistor. A deflection yoke, wherein a variable terminal of the variable resistor is connected to a connection point between the first and second vertical deflection coils.
(B) In a deflection yoke to be mounted on an in-line type color picture tube, first and second terminals (1, 2) and first and second terminals connected in series between the first and second terminals. And a first and second diode (7, 8) connected in series so that the polarities are opposite to each other, and provided between the first and second diodes. A first series circuit comprising first and second fixed resistors (14, 15), and third and fourth diodes (9, 10) connected in series so that the polarities are opposite to each other. A second series circuit including third and fourth fixed resistors (16, 17) provided between the third and fourth diodes, wherein the first diode and the third diode are provided. Are connected so that their polarities are opposite to each other, and the second diode Between the connection point of the first and second fixed resistors and the connection point of the third and fourth fixed resistors, and a parallel circuit in which the third diode and the fourth diode are connected so that their polarities are opposite to each other. And a connecting point between the first terminal and the first vertical deflection coil is connected to the first diode and the third diode without a resistor. Connected to a connection point, a connection point between the second terminal and the second vertical deflection coil is connected to a connection point between the second diode and the fourth diode without through a resistor, A deflection yoke, wherein a variable terminal of the variable resistor is connected to a connection point of the first and second vertical deflection coils.
(C) In a deflection yoke attached to an in-line type color picture tube, first and second terminals (1, 2) and first and second terminals connected in series between the first and second terminals. And the first and second diodes (7, 8) connected in series so that the polarities are opposite to each other, and connected in series so that the polarities are opposite to each other. Third and fourth diodes (9, 10), the first diode and the third diode are connected so that the polarities thereof are opposite to each other, and the second diode and the fourth diode are connected to each other. A parallel circuit in which diodes are connected so that their polarities are opposite to each other; a variable resistor connected between a connection point between the first and second diodes and a connection point between the third and fourth diodes. (11) and one end of the first and second A fixed resistor (18) connected to a connection point of the direct deflection coil and the other end connected to a variable terminal of the variable resistor, wherein a connection point between the first terminal and the first vertical deflection coil is Without a resistor, connected to a connection point between the first diode and the third diode, a connection point between the second terminal and the second vertical deflection coil, without a resistor, The deflection yoke is connected to a connection point between the second diode and the fourth diode.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a deflection yoke according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is a circuit diagram showing a first embodiment of a deflection yoke according to the present invention, FIG. 2 is a diagram showing a relationship between a magnetic field and a deflection force for explaining the operation of the deflection yoke according to the present invention, and FIG. FIG. 4 is a diagram for explaining a correction operation on a screen by a deflection yoke, FIG. 4 is a circuit diagram showing a second embodiment of the deflection yoke of the present invention, and FIG. 5 is a circuit showing a third embodiment of the deflection yoke of the present invention. FIG. 1, 4 and 5, the same parts as those in FIG. 6 are denoted by the same reference numerals.
[0015]
<First embodiment>
The first embodiment shown in FIG. 1 solves the first problem described above and achieves the first object. In FIG. 1, vertical deflection coils 3 and 4 are connected in series between terminals 1 and 2. The vertical deflection coils 3 and 4 are arranged on the left and right sides of the neck of the in-line type color picture tube. A parallel circuit is formed by diodes 7 and 8 connected in series so that the polarities are opposite to each other, and diodes 9 and 10 connected in series so that the polarities are opposite to each other. The diode 7 and the diode 9 have opposite polarities, and the diode 8 and the diode 10 have opposite polarities.
[0016]
The connection point between the terminal 1 and the vertical deflection coil 3 is connected to the connection point between the diodes 7 and 9 without using a resistor, unlike the conventional example of FIG. The point is different from the conventional example of FIG. 6 and is connected to the connection point of the diodes 8 and 10 without using a resistor. Further, a variable resistor 11 and fixed resistors 12 and 13 are connected in series between the connection point of the diodes 7 and 8 and the connection point of the diodes 9 and 10 so as to sandwich the variable resistor 11 therebetween. A variable terminal (slider) of the variable resistor 11 is connected to a connection point between the vertical deflection coils 3 and 4.
[0017]
In the configuration shown in FIG. 1, even when the variable terminal of the variable resistor 11 is located at the middle point, the resistance values of the resistors 12 and 13 are appropriately set so that the resistance values of the resistors 12 and 13 are different from each other. , An unbalanced current flows through the vertical deflection coils 3 and 4. This makes it possible to correct the horizontal misconvergence shown in FIGS. 7A and 7B even when the variable terminal of the variable resistor 11 is located at the middle point.
[0018]
Here, consider a case where the resistance values of the resistors 12 and 13 are set as resistance 12 <resistance 13. When deflecting to the upper side of the screen of the color picture tube, it is assumed that a vertical deflection current flows in the direction of the solid line arrow in FIG. When the vertical deflection current flows in the direction of the solid line arrow, the diodes 9 and 8 are turned on, and the diodes 7 and 10 are turned off.
[0019]
At this time, the resistance value connected in parallel to the vertical deflection coil 3 is closer to the resistance 13 than the resistance 13 and the variable terminal of the variable resistance 11. Since the variable terminal of the variable resistor 11 is located at the middle point, the resistance becomes 13+ (variable resistor 11) / 2. The resistance value connected in parallel to the vertical deflection coil 4 is on the resistance 12 side of the variable terminal of the resistance 12 + variable resistance 11, that is, the resistance 12+ (variable resistance 11) / 2. Since the resistance 12 is smaller than the resistance 13, when the currents flowing through the vertical deflection coils 3 and 4 are compared, the vertical deflection coil 3> the vertical deflection coil 4 is obtained.
[0020]
In this state, assuming that the magnetic field generated from the vertical deflection coil 3 is φ3 and the magnetic field generated from the vertical deflection coil 4 is φ4, the vertical deflection magnetic field is φ3> φ4. As a result, as shown in FIG. 2A, the deflection forces FR and FB applied to the electron beams R and B satisfy FR <FB. Since the deflecting force FB applied to the electron beam B is larger than the deflecting force FR applied to the electron beam R, as shown in FIG. Will be deflected upward. Therefore, the horizontal line misconvergence in which the horizontal line of B indicated by the broken line at the upper end of the screen shown in FIG. 7A is shifted below the horizontal line of R indicated by the solid line is corrected.
[0021]
On the other hand, when deflecting to the lower side of the screen of the color picture tube, it is assumed that a vertical deflection current flows in the direction indicated by the broken arrow in FIG. When the vertical deflection current flows in the direction of the dashed arrow, the diodes 10 and 7 are turned on, and the diodes 8 and 9 are turned off.
[0022]
At this time, the resistance value connected in parallel to the vertical deflection coil 3 is closer to the resistance 12 than the variable terminal of the resistance 12 + variable resistance 11, that is, the resistance 12+ (variable resistance 11) / 2. The resistance value connected in parallel to the vertical deflection coil 4 is closer to the resistance 13 than the resistance 13 + variable terminal of the variable resistance 11, that is, the resistance 13+ (variable resistance 11) / 2. Since the resistance 12 is smaller than the resistance 13, when the currents flowing through the vertical deflection coils 3 and 4 are compared, the vertical deflection coil 3 is smaller than the vertical deflection coil 4.
[0023]
In this state, the vertical deflection magnetic field satisfies φ3 <φ4. As a result, as shown in FIG. 2B, the deflection forces FR and FB applied to the electron beams R and B satisfy FB <FR. Since the deflecting force FR applied to the electron beam R is larger than the deflecting force FB applied to the electron beam B, as shown in FIG. It will be deflected below. Therefore, the horizontal line misconvergence in which the horizontal line of B shown by a broken line at the lower end of the screen shown in FIG. 7A is shifted below the horizontal line of R shown by a solid line is corrected.
[0024]
Although not particularly shown, in the configuration shown in FIG. 1, when the resistance values of the resistors 12 and 13 are set as “resistance 12> resistance 13”, the case is opposite to the case where the above-described resistance 12 is set as “resistance 13”. The horizontal line misconvergence shown in (B) is corrected.
[0025]
As described above, the deflection yoke according to the first embodiment shown in FIG. 1 has the variable terminal of the variable resistor 11 located at the middle point, and is caused by the characteristics of the color picture tube and the vertical deflection coils 3 and 4. Horizontal line misconvergence occurring almost uniformly can be corrected in advance. Therefore, the ITC maker or the display device maker adjusts the variable resistor 11 with each deflection yoke attached to each color picture tube, thereby correcting the horizontal misconvergence caused by the variation of each color picture tube. do it.
[0026]
In the conventional example shown in FIG. 6, when the resistance values of the resistors 5 and 6 are made different in a state where the variable terminal of the variable resistor 11 is located at the middle point, FIGS. At the upper and lower ends of the screen, horizontal line misconvergence in which the horizontal line of B indicated by a dashed line deviates inward (upward and downward center side) from the horizontal line of R indicated by a solid line or moves outward (upper and lower end portions). It is only corrected. In the conventional example shown in FIG. 6, the horizontal line misconvergence shown in FIGS. 7A and 7B cannot be corrected with the variable terminal of the variable resistor 11 positioned at the middle point.
[0027]
<Second embodiment>
The second embodiment shown in FIG. 4 also solves the first problem described above and achieves the first object. In FIG. 4, vertical deflection coils 3 and 4 are connected in series between terminals 1 and 2. The vertical deflection coils 3 and 4 are arranged on the left and right sides of the neck of the in-line type color picture tube. A series circuit composed of diodes 7,8 and fixed resistors 14,15 provided between the diodes 7,8, and fixed resistors 16,17 provided between the diodes 9,10 and the diodes 9,10; A series circuit and a parallel circuit are formed.
[0028]
The diodes 7 and 8 are connected in series so that the polarities are opposite to each other, and the diodes 9 and 10 are also connected in series so that the polarities are opposite to each other.
The diode 7 and the diode 9 have opposite polarities, and the diode 8 and the diode 10 have opposite polarities.
[0029]
The connection point between the terminal 1 and the vertical deflection coil 3 is connected to the connection point between the diodes 7 and 9 without using a resistor, unlike the conventional example of FIG. The point is different from the conventional example of FIG. 6 and is connected to the connection point of the diodes 8 and 10 without using a resistor. Further, a variable resistor 11 is connected between a connection point between the resistors 14 and 15 and a connection point between the resistors 16 and 17. A variable terminal (slider) of the variable resistor 11 is connected to a connection point between the vertical deflection coils 3 and 4.
[0030]
In the configuration shown in FIG. 4 as well, in a state where the variable terminal of the variable resistor 11 is located at the middle point, the resistance values of the resistor 14 and the resistor 17 are different from each other, and the resistance values of the resistor 15 and the resistor 16 are If the resistance values of the resistors 14 to 17 are appropriately set differently, an unbalanced current flows through the vertical deflection coils 3 and 4. This makes it possible to correct the horizontal misconvergence shown in FIGS. 7A and 7B even when the variable terminal of the variable resistor 11 is located at the middle point, as in the first embodiment.
[0031]
<Third embodiment>
The third embodiment shown in FIG. 5 solves the above-described second problem and achieves a second object. In FIG. 5, vertical deflection coils 3 and 4 are connected in series between terminals 1 and 2. The vertical deflection coils 3 and 4 are arranged on the left and right sides of the neck of the in-line type color picture tube. A parallel circuit is formed by diodes 7 and 8 connected in series so that the polarities are opposite to each other, and diodes 9 and 10 connected in series so that the polarities are opposite to each other. The diode 7 and the diode 9 have opposite polarities, and the diode 8 and the diode 10 have opposite polarities.
[0032]
The connection point between the terminal 1 and the vertical deflection coil 3 is connected to the connection point between the diodes 7 and 9 without using a resistor, unlike the conventional example of FIG. The point is different from the conventional example of FIG. 6 and is connected to the connection point of the diodes 8 and 10 without using a resistor. Further, a variable resistor 11 is connected between a connection point between the diodes 7 and 8 and a connection point between the diodes 9 and 10. One end of a fixed resistor 18 is connected to a connection point between the vertical deflection coils 3 and 4, and the other end of the resistor 18 is connected to a variable terminal (slider) of the variable resistor 11.
[0033]
The deflection yoke according to the third embodiment cannot correct the horizontal misconvergence shown in FIGS. 7A and 7B in a state where the variable terminal of the variable resistor 11 is located at the middle point. By moving the position of the variable terminal of the variable resistor 11 to the diodes 7 and 8 or the diodes 9 and 10 as in the conventional example, the horizontal misconvergence shown in FIGS. 7A and 7B can be corrected. . The deflection yoke according to the third embodiment can reduce the resistance by one and can reduce the number of components as compared with the conventional example of FIG. Therefore, space saving and cost reduction can be achieved.
[0034]
【The invention's effect】
As described in detail above, the deflection yoke of the present invention has the characteristics of the color picture tube and the vertical deflection coil with the variable terminal of the variable resistor positioned at the middle point by the configuration of the first and second embodiments. The horizontal line misconvergence which occurs almost uniformly due to the above can be corrected in advance. Further, with the configuration of the third embodiment, horizontal line misconvergence can be corrected with a smaller number of components.
[Brief description of the drawings]
FIG. 1 is a circuit diagram showing a first embodiment of a deflection yoke according to the present invention.
FIG. 2 is a diagram illustrating a relationship between a magnetic field and a deflection force for explaining an operation of the deflection yoke of the present invention.
FIG. 3 is a diagram for explaining a correction operation on a screen by a deflection yoke according to the present invention.
FIG. 4 is a circuit diagram showing a second embodiment of the deflection yoke of the present invention.
FIG. 5 is a circuit diagram showing a third embodiment of the deflection yoke of the present invention.
FIG. 6 is a circuit diagram showing a conventional example.
FIG. 7 is a diagram showing a horizontal line misconvergence pattern.
FIG. 8 is a diagram showing another horizontal line misconvergence pattern.
[Explanation of symbols]
1, 2 terminal 3, 4 vertical deflection coil 7-10 diode 11 variable resistor 12-18 fixed resistor

Claims

In the deflection yoke attached to the in-line type color picture tube,
First and second terminals;
First and second vertical deflection coils connected in series between the first and second terminals;
A first diode and a second diode connected in series so that the polarities are opposite to each other, and a third diode and a fourth diode connected in series so that the polarities are opposite to each other; A parallel circuit in which the diode and the third diode are connected so that the polarities are opposite to each other, and the second diode and the fourth diode are connected so that the polarities are opposite to each other;
It has a variable resistor and first and second fixed resistors sandwiching the variable resistor, and is connected between a connection point of the first and second diodes and a connection point of the third and fourth diodes. With a series circuit,
A connection point between the first terminal and the first vertical deflection coil is connected to a connection point between the first diode and the third diode without a resistor, and the second terminal and the third terminal are connected to each other. A connection point with the second vertical deflection coil is connected to a connection point between the second diode and the fourth diode without through a resistor,
A deflection yoke, wherein a variable terminal of the variable resistor is connected to a connection point of the first and second vertical deflection coils.

In the deflection yoke attached to the in-line type color picture tube,
First and second terminals;
First and second vertical deflection coils connected in series between the first and second terminals;
A first series comprising first and second diodes connected in series so that the polarities are opposite to each other, and first and second fixed resistors provided between the first and second diodes. A circuit, third and fourth diodes connected in series so that the polarities are opposite to each other, and third and fourth fixed resistors provided between the third and fourth diodes. The first diode and the third diode are connected so that their polarities are opposite to each other, and the second diode and the fourth diode are connected to each other so that their polarities are opposite to each other. A parallel circuit connected so that
A variable resistor connected between a connection point of the first and second fixed resistors and a connection point of the third and fourth fixed resistors,
A connection point between the first terminal and the first vertical deflection coil is connected to a connection point between the first diode and the third diode without a resistor, and the second terminal and the third terminal are connected to each other. A connection point with the second vertical deflection coil is connected to a connection point between the second diode and the fourth diode without through a resistor,
A deflection yoke, wherein a variable terminal of the variable resistor is connected to a connection point of the first and second vertical deflection coils.

In the deflection yoke attached to the in-line type color picture tube,
First and second terminals;
First and second vertical deflection coils connected in series between the first and second terminals;
A first diode and a second diode connected in series so that the polarities are opposite to each other, and a third diode and a fourth diode connected in series so that the polarities are opposite to each other; A parallel circuit in which the diode and the third diode are connected so that the polarities are opposite to each other, and the second diode and the fourth diode are connected so that the polarities are opposite to each other;
A variable resistor connected between a connection point of the first and second diodes and a connection point of the third and fourth diodes;
A fixed resistor having one end connected to a connection point of the first and second vertical deflection coils and the other end connected to a variable terminal of the variable resistor;
A connection point between the first terminal and the first vertical deflection coil is connected to a connection point between the first diode and the third diode without a resistor, and the second terminal and the third terminal are connected to each other. The deflection yoke is characterized in that a connection point with the second vertical deflection coil is connected to a connection point between the second diode and the fourth diode without through a resistor.