JP2004079476A - Manufacturing method of color selection electrode for color cathode-ray tube and color cathode-ray tube - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method and device of a color selection electrode for a color cathode-ray tube, providing tension force distribution with high accuracy without deforming the color selection electrode device, and excellent in productivity and practical use. <P>SOLUTION: A relationship between an amount of displacement of a moving member for applying a force to a frame member via an elastic member, and a force applied to the frame member is obtained to inversely calculate an amount of displacement required for applying a desired load to the frame material. In order to perform welding with the moving material displaced by the calculated amount of displacement, the initial load is defined to satisfy, for example, formula (10). <P>COPYRIGHT: (C)2004,JPO

Description

（ここで、
Ｋｉは、荷重点Ｑｉにおける弾性部材の弾性係数、
Ｋｊは、荷重点Ｑｊ（ｊは荷重点の番号、ｊ＝１〜ｎ）における弾性部材の弾性係数、
Δｙｍｊは、上記ステップ（ｂ）における、各荷重点Ｑｊにおける移動部材の変位、
Ｒｊは、荷重点Ｑｊにおける前記一対のフレーム部材の、前記互いに接近する方向の変形についての、弾性係数である）
で与えられる初期荷重指標Ｓｉ以上と定めることを特徴とする。
【００２７】
請求項２に記載の色選別電極の製造方法は、
電子ビームを通過させるスリットまたは孔が形成された金属薄板からなるカラー陰極線管用色選別電極素体を、略四角枠形状に形成されたフレームの一対の対向するフレーム部材に固定することを含む色選別電極の製造方法であって、
（ａ）前記対向するフレーム部材の長手方向の異なる位置に設定された複数の荷重点のうちの、少なくとも両端部の荷重点以外の荷重点について、該荷重点にそれぞれ当接する当接部材に、それぞれ別個の弾性部材を介して、それぞれ対応する移動部材を変位させて、初期荷重Ｆ０ｉを付与することにより、前記対向するフレーム部材が互いに接近する方向の力を与えるステップと、
（ｂ）前記初期荷重を付与した状態から、さらに、前記移動部材をそれぞれ既知の変位量Δｙｍｉだけ変位させて、前記両端部以外の荷重点に加わる力を計測し、前記移動部材の変位量と前記両端部以外の荷重点に加わる力の変化分の関係式を求めるステップと、
（ｃ）この関係式から前記両端部以外の荷重点に加わる力が所望の値Ｐｉになる前記移動部材の各々の変位量の目標値を算出し、各移動部材を前記算出された変位量の目標値だけ変位させるステップと、
（ｄ）ステップ（ｃ）により前記移動部材を変位させた状態で、前記色選別電極素体を前記一対の互いに対向するフレーム部材に溶接するステップと
を有し、
前記ステップ（ｂ）において、各移動部材を移動させた後、該移動部材を元の位置に戻し、その後別の移動部材を移動させることを繰り返し、前記移動部材を順に移動させ、
前記ステップ（ａ）における前記初期荷重Ｆ０ｉを、
【数４】

（ここで、
Ｋｉは、荷重点Ｑｉにおける弾性部材の弾性係数、
Ｋｊは、荷重点Ｑｊ（ｊは荷重点の番号、ｊ＝１〜ｎ）における弾性部材の弾性係数、
Δｙｍｊは、上記ステップ（ｂ）における、荷重点Ｑｊにおける移動部材の変位、
Ｒｊは、荷重点Ｑｊにおける前記一対のフレーム部材の、前記互いに接近する方向の変形についての弾性係数である）
で与えられる初期荷重指標Ｓｉ以上と定めることを特徴とする。
請求項３に記載の色選別電極の製造方法は、請求項１又は２に記載の方法において、
前記フレーム部材の弾性係数Ｒｊを
Ｒｉ＝３Ｅ・Ｉ・Ｌ／｛Ｘｉ^２・（Ｌ−Ｘｉ）^２｝　．．．（６）
（ここで、
Ｅはフレーム部材のヤング率、
Ｉは前記フレーム部材の断面二次モーメント、
Ｘｉは、フレーム部材の一端から、当該荷重点Ｑｉまでの距離、
Ｌはフレーム部材の長さである）
により求めることを特徴とする。
【００２８】
請求項４に記載の色選別電極の製造方法は、
電子ビームを通過させるスリットまたは孔が形成された金属薄板からなるカラー陰極線管用色選別電極素体を、略四角枠形状に形成されたフレームの一対の対向するフレーム部材に固定することを含む色選別電極の製造方法であって、
（ａ）前記対向するフレーム部材の長手方向の異なる位置に設定された複数の荷重点のうちの、少なくとも両端部の荷重点以外の荷重点について、該荷重点にそれぞれ当接する当接部材に、それぞれ別個の弾性部材を介して、それぞれ対応する移動部材を変位させて、初期荷重Ｆ０ｉを付与することにより、前記対向するフレーム部材が互いに接近する方向の力を与えるステップと、
（ｂ）前記初期荷重を付与した状態から、さらに、前記移動部材をそれぞれ既知の変位量Δｙｍｉだけ変位させて、前記両端部以外の荷重点に加わる力を計測し、前記移動部材の変位量と前記両端部以外の荷重点に加わる力の変化分の関係式を求めるステップと、
（ｃ）この関係式から前記両端部以外の荷重点に加わる力が所望の値Ｐｉになる前記移動部材の各々の変位量の目標値を算出し、各移動部材を前記算出された変位量の目標値だけ変位させるステップと、
（ｄ）ステップ（ｃ）により前記移動部材を変位させた状態で、前記色選別電極素体を前記一対の互いに対向するフレーム部材に溶接するステップと
を有し、
前記ステップ（ａ）における前記初期荷重Ｆ０ｉが、
（Ｔ−０．２）×Ｐｉ　≦　Ｆ０ｉ　≦（Ｔ＋０．２）×Ｐｉ　　…（１２）
（ただし、Ｔは、すべての荷重点に共通の所定の定数）
を満たす範囲内にあることを特徴とする。
請求項５に記載の色選別電極の製造方法は、請求項４に記載の方法において、
前記ステップ（ｂ）において、各移動部材を移動させた後、該移動部材を元の位置に戻すことなく別の移動部材を移動させることを繰り返し、前記移動部材を順に移動させ、
前記ステップ（ｂ）における前記移動部材の各々の移動の前に、各荷重点に掛かる荷重Ｆｉｊが
（Ｔ−０．２）×Ｐｉ以上で、且つ
（Ｔ＋０．２）×Ｐｉ以下である
ことを特徴とする。
請求項６に記載の色選別電極の製造方法は、請求項４に記載の方法において、
前記ステップ（ａ）における前記初期荷重Ｆ０ｉが、
（Ｔ−０．１）×Ｐｉ　≦　Ｆ０ｉ　≦（Ｔ＋０．１）×Ｐｉ　…（１３）
を満たす範囲内にあり、かつ
前記定数Ｔが、
０．８≦Ｔ≦１．０　…（１４）
を満たす範囲内にあることを特徴とする。
請求項７に記載の色選別電極の製造方法は、請求項６に記載の方法において、
前記ステップ（ｂ）において、各移動部材を移動させた後、該移動部材を元の位置に戻すことなく別の移動部材を移動させることを繰り返し、前記移動部材を順に移動させ、
前記ステップ（ｂ）における前記移動部材の各々の移動の前に、各荷重点に掛かる荷重Ｆｉｊが
（Ｔ−０．１）×Ｐｉ以上で、且つ
（Ｔ＋０．１）×Ｐｉ以下である
ことを特徴とする。
【００２９】
請求項８に記載の色選別電極の製造方法は、請求項１、２、又は４に記載の方法において、
前記ステップ（ａ）における初期荷重が、前記荷重が所望の値Ｐｉとなった状態を含み、かつ前記移動部材の変位と対応する荷重点に加わる力の関係が線形である範囲内にあることを特徴とする。
【００３０】
請求項９に記載の色選別電極の製造方法は、請求項１、２、又は４に記載の方法において、（ｅ）前記フレーム部材の長手方向の両端部において、荷重点に加えられる力が所定の値となるまで、前記移動部材を移動させるステップをさらに含むことを特徴とする。
【００３１】
請求項１０に記載の色選別電極の製造方法は、請求項１、２、又は４に記載の方法において、
前記ステップ（ｂ）において、前記移動部材の各々を移動させ、移動させる前にそれぞれの荷重点において加わる力と、移動させた後にそれぞれの荷重点において加わる力との差を、各移動部材の移動による力の変化分として算出することを特徴とする。
【００３２】
請求項１１に記載のカラー陰極線管は、請求項１乃至１０のいずれかに記載の製造方法で得られた色選別電極を備えてなることを特徴とする。
【００３３】
【発明の実施の形態】
実施の形態１．
この発明の第１の実施の形態を図を用いて説明する。図１及び図２は、本実施の形態による色選別電極の製造方法の製造過程における、フレームの変形を概略的に示すものである。
【００３４】
このフレーム４は、従来技術で説明したのと同様、略四角枠形状に形成されたものであり、一対の互いに対向する、例えば互いに略平行なフレーム部材４ａと、フレーム部材４ａに対して垂直な方向に延び、このフレーム部材４ａを連結する一対の互いに対向するフレーム部材４ｂとを有する。従来技術で説明したのと同様、このフレーム４の一対のフレーム部材４ａに力（圧縮力）を加えることにより、フレーム部材４ａを互いに接近させて、その状態で、電子ビームを通過させるスリットまたは孔が形成された金属薄板からなるカラー陰極線管用色選別電極素体３が、フレーム４に溶接される。
【００３５】
フレーム部材４ａを互いに接近させると、そのときフレーム部材４ａ及び４ｂが変形する。図１は図１７に示すフレーム４を加圧乃至圧縮するときのフレーム部材４ｂの変形過程を示すものである。図２は図１においてＺ方向からフレーム４を見た図であり、フレーム部材４ａの外形の変位を点線で表してフレーム部材４ａの変形過程を模式的に示している。
【００３６】
フレーム部材４ａには、その長手方向の異なる位置Ｘｉ（ｉ＝１〜６）に複数の荷重点Ｑｉ（ｉ＝１〜６）が設定されている。位置Ｘｉは、フレーム部材４ａの一端から各荷重点Ｑｉまでの距離、言換えると、フレーム部材４ａの一端を基準とする荷重点ＱｉのＸ方向の位置を表わす。各荷重点Ｑｉには、力Ｆｉ（ｉ＝１〜６）が加えられる。
【００３７】
状態Ａは力を加える前のフレームの状態であり、状態Ｂはフレーム４に後述の初期荷重Ｆ０ｉを加えてそれぞれの荷重点Ｑｉを変位させた状態（初期荷重付与状態）、状態Ｃは荷重点Ｑｉを所定量ΔＹｂ変位させた後の状態、状態Ｄは荷重点に加える力Ｆｉが所望の値（Ｐｉ）になるように荷重点ＱｉをさらにΔＹｃ変位させた状態である。
【００３８】
この実施の形態では、状態Ａから状態Ｂに移行させる工程、即ち、初期荷重付与の工程が特許請求の範囲のステップ（ａ）に対応し、以下の説明では、第一の工程とも呼ばれる。また、状態Ｂから状態Ｃに移行させる工程が、特許請求の範囲のステップ（ｂ）に対応するもので、以下の説明では第二の工程とも呼ばれる。また状態Ｃから状態Ｄに移行させる工程が、特許請求の範囲のステップ（ｃ）に対応するもので、以下の説明では第三の工程とも呼ばれる。
【００３９】
図３は本実施の形態の色選別電極製造装置の概略を示す斜視図であり、図４は、図３の色選別電極の制御系の概略を示すブロック図である。図示のように、この製造装置は、複数の圧縮ユニットＬｉ（ｉ＝１〜６）を有する。これらの圧縮ユニットＬｉは、それぞれ複数の荷重点Ｑｉに対応して設けられ、対応する荷重点Ｑｉにおいて対向するフレーム部材４ａに力（圧縮力）を加えて、互いに接近する方向に変形させるものである。
【００４０】
図示の例では、荷重点Ｑｉが６つ設けられ、これに対応して圧縮ユニットＬｉも６つ設けられている。各圧縮ユニットＬｉはそれぞれＹ方向（フレーム部材４ａを互いに接近、離間する方向）に延び、互いに整列したレール２２、２３を有する。なお、レール２２，２３は別体のものとして示してあるが、一体のものであっても良い。
【００４１】
移動ベース１６、２０、２１はレール２２、２３上を各々独立に自在に滑動する。一方、移動ベース１７、１８、１９は板２４に連結されて一体となってレール２２上を自在に滑動する。レール２３と、移動ベース１６、１７、１８、１９、２０、２１とにより、直線案内機構が構成されている。当接部材２５、２６は、移動ベース１６、２１に搭載された板２７、２８に取り付けられており、当接部材が属する圧縮ユニットＬｉが対応する荷重点Ｑｉにおいてフレーム部材４ａの外側面４ｃに当接する。かくして、複数の圧縮ユニットＬｉの当接部材２５，２６が、フレーム部材４ａの長手方向（Ｘ方向）に沿って各々一対としてＹ方向に対向配置され、フレーム部材４ａに設定された複数の荷重点Ｑｉにおいてフレーム部材４ａの外側面４ｃに当接する。力センサ２９は当接部材２５に加わる力を、板２７を介して計測するものであり、板２４に取り付けられた移動部材３０に取り付けられている。
【００４２】
モータ３１はボールネジ３２を回転させる。ボールネジ３２は一端が丸軸加工されて軸受３３に保持されている。ナット３４はボールネジ３２に係合し、移動ベース２０に搭載された移動部材３５に取り付けられ、ボールネジ３２の回転運動を直線運動に変換して移動部材３５をレール２３に案内されてＹ方向に移動させる。
【００４３】
移動部材３０、板２７、２８には、貫通穴３７、３８、３９が設けられ、この貫通穴をポールネジ３２が干渉することなく貫通している。弾性部材例えば圧縮バネ３６が移動部材３５に取り付けられており、移動部材３５の移動乃至推進力を板２８に伝達する。接触式の変位センサ４０は、移動部材３５のＹ方向の変位（移動部材３０に対する相対的変位）を計測する。
【００４４】
モータ３１、軸受３３、移動部材３０は板２４により一体となってＹ方向に移動するようになっている。モータ３１を駆動すると移動部材３０と移動部材３５は互いに接近または離間する。そして、互いに接近することで、フレーム部材４ａを互いに接近させる力（圧縮力）が発生する。この圧縮力は、圧縮バネ３６を介して当接部材２５、２６に伝達され、この当接部材２５、２６によりフレーム部材４ａに圧縮力が伝達される。
【００４５】
図４に示すように、力センサ２９で計測された力を示す信号、及び変位センサ４０で計測された変位を示す信号は、それぞれ信号線Ｗｆ１乃至Ｗｆ６、Ｗｄ１乃至Ｗｄ６を介して、制御部ＣＴに供給され、これらに基づいて制御部ＣＴで生成される駆動指令が信号線Ｗｒ１乃至Ｗｒ６を介してモータ３１に供給される。
【００４６】
以下、簡単化のため、荷重点Ｑｉの数が２である場合について図５を参照して荷重点に加える力の制御について説明する模式図である。図５で、符号４ｃ及び３６は、図３と同じくフレーム部材４ａの外側面、及び圧縮バネを示す。符号３５−１及び３５−２は、図３の移動部材３５を示すが、区別のため、荷重点Ｑ１に設けられたものに符号３５−１が、荷重点Ｑ２に設けられたものに符号３５−２が付されている。但し、上記のような区別の必要のないときは、符号３５が用いられる。また、Ｋｉは荷重点Ｑｉにおける圧縮バネ３６のバネ定数である。
【００４７】
移動部材３５−ｉ（ｉ＝１又は２）が点線の位置から実線の位置までΔｙｍｉ（ｉ＝１又は２）変位したときフレーム部材４ａの外側面４ｃが点線の位置から実線の位置まで変位し、フレーム部材４ａに設定された荷重点Ｑｉに加わる力の増分ΔＦｉ（ｉ＝１又は２）が力センサ２９及び制御部ＣＴで求められていることを示す。フレーム部材４ａの外側面４ｃが点線の位置から実線の位置まで変位したときの荷重点Ｑｉの変位は、ΣΔｙｉｊである。なお、添え字ｉは変位する荷重点に対応し、ｊは荷重点Ｑｉの変位に影響を与える力を加えている荷重点に対応する。移動部材３５−１、３５−２、フレーム部材４ａについて点線で表した状態は状態Ｂで、実線で表した状態は状態Ｃである。
【００４８】
以下、図３及び図４に示すのと同様の装置で、荷重点Ｑｉ及び圧縮ユニットＬｉの数が２であるものの動作について説明する。まず、図３に示すのと同様の装置に、図１７に示すフレーム４をセットすると、図１、図２に示す状態Ａとなる。次に装置制御部ＣＴから信号線Ｗｒ１、Ｗｒ２を介して供給される指令に基づき各圧縮ユニットＬ１、Ｌ２のモータ３１が駆動してボールネジ３２を回転させると、この回転運動がナット３４によって直線運動に変換され、このナットが取り付けられた移動部材３５が直線案内機構のレール２３に案内されてモータ３１の方に、従って、移動部材３０の方に移動する。
【００４９】
移動部材３５が移動すると、圧縮バネ３６を介して、板２８が押され、板２８と一体となった当接部材２６がフレーム４を押す。フレーム４が押されて移動部材３０の方に移動すると、これにより当接部材２５が押され、当接部材２５と一体となった板２７が移動して、板２７が、移動部材３０に取り付けられ、移動部材３０と板２７の間に介在する力センサ２９に当接する。
【００５０】
さらにモータ３１の駆動を継続すると、圧縮バネ３６が圧縮され、これが復元しようとする力が、当接部材２６を介してフレーム部材４ａに設定された荷重点Ｑ１又はＱ２に作用するとともに、圧縮バネ３６が復元しようとする力はナット３４、ボールネジ３２、軸受３３、板２４、移動部材３０、力センサ２９を介して板２７と一体となった当接部材２５を当接部材２６の方向に移動させる。これにより当接部材２５と２６は互いに引き合って接近することになり、フレーム部材４ａの外側面４ｃに、フレーム部材４ａを互いに接近させる方向に、作用・反作用の力が加えられる。
【００５１】
従って、力センサ２９で計測される力は当接部材２５に加わる力であるとともに当接部材２６に加わる力でもある。当接部材２５、２６の双方がフレーム部材４ａに当接した時点からフレーム部材４ｂ、４ａの実際の変形が始まり、フレーム部材４ｂが下に凸状に曲がると共にフレーム部材４ａが互いに接近し始め、力センサ２９の計測値が立ち上がる。力センサ２９の計測値は信号線Ｗｆ１、Ｗｆ２を介して装置制御部ＣＴに送られ、この装置制御部ＣＴで当接部材に加わる力Ｆｉに変換される。フレーム部材４ａの任意の荷重点Ｑｉすべてにおいて荷重点に加わる力Ｆｉが所定の初期荷重値Ｆ０ｉ（各荷重点に対し別個に、後に詳述するように定められる）となるまで移動部材３５を移動させる。これにより任意の荷重点ＱｉはＹ方向に変位し状態Ｂ（即ち初期荷重付与状態）となる。
【００５２】
接触式変位センサ４０は移動部材３０に対する移動部材３５の相対的変位を計測するものであり、一端が移動部材３５に固定され、他端が、移動部材３０に対して固定された部材（図示しない）に固定されている。但し、移動部材３５の移動量（レール２２に対する）と移動部材３０の移動量（レール２３に対する）が略等しいことが保証される場合には、レール２２，２３に対して固定された部材に、接触式変位センサ４０の上記他端を固定しても良い。
【００５３】
接触式変位センサ４０の計測値も信号線Ｗｄ１、Ｗｄ２を介して装置制御部ＣＴに送られ、この装置制御部ＣＴで移動部材３５の変位量（移動部材３０に対する相対的変位量）に変換される。
【００５４】
図５において、状態Ｂから移動部材３５をΔｙｍ１、Δｙｍ２移動させると圧縮バネ３６が圧縮されるとともに荷重点Ｑ１、Ｑ２が変位し、状態Ｃとなる。ここでΔｙｍ１の移動による荷重点Ｑ１の変位量をΔｙ１１、荷重点Ｑ２の変位量をΔｙ２１、Δｙｍ２の移動による荷重点Ｑ２の変位量をΔｙ２１、荷重点Ｑ１の変位量をΔｙ２２とすると、力Ｆ１、Ｆ２の、所定値Ｆ０１、Ｆ０２からの変化分ΔＦ１、ΔＦ２は、
ΔＦ１＝Ｋ１・（Δｙｍ１−Δｙ１１）−Ｋ１・Δｙ１２
ΔＦ２＝−Ｋ２・Δｙ２１＋Ｋ２・（Δｙｍ２−Δｙ２２）
となる。
【００５５】
ΔＦ１＝ΔＦ１１＋ΔＦ１２
ΔＦ２＝ΔＦ２１＋ΔＦ２２
とおくと
ΔＦ１＝ΔＦ１１・Δｙｍ１／Δｙｍ１＋ΔＦ１２・Δｙｍ２／Δｙｍ２
ΔＦ２＝ΔＦ２１・Δｙｍ１／Δｙｍ１＋ΔＦ２２・Δｙｍ２／Δｙｍ２
行列で表わすと下記の式（１）のようになる。
【００５６】
【数５】

【００５７】
式（１）左辺の行列をΔＦ、右辺の左の行列をＪ、右辺の右の行列をΔＹとすると、
ΔＦ＝Ｊ・ΔＹ　．．．（２）
となり、Ｊはヤコビアンである。第二の工程では状態Ｂから状態Ｃに移行させ、このヤコビアンＪを求める。
【００５８】
式（１）で
ΔＦ１１／Δｙｍ１＝Ｊ１１、
ΔＦ１２／Δｙｍ２＝Ｊ１２、
ΔＦ２１／Δｙｍ１＝Ｊ２１、
ΔＦ２２／Δｙｍ２＝Ｊ２２
とおいて、制御入力としてΔｙｍ１を与える（移動部材３５をΔｙｍ１だけ移動させる）と力センサ２９でＦｃ１１、Ｆｃ２１が計測され、この計測値の増分、この場合は、この計測値と状態Ｂでの計測値Ｆ０１、Ｆ０２との差Ｆｃ１１−Ｆ０１、Ｆｃ２１−Ｆ０２から、ΔＦ１１、ΔＦ２１が算出される。即ち、
ΔＦ１１＝Ｆｃ１１−Ｆ０１、
ΔＦ２１＝Ｆｃ２１−Ｆ０２
によりΔＦ１１、ΔＦ２１が算出される。そしてこれらの値からＪ１１とＪ２１が計算される。
【００５９】
次に制御入力Δｙｍ１を与えたままで、制御入力としてΔｙｍ２を与える（移動部材３５をΔｙｍ２だけ移動させる）と力センサ２９で力Ｆｃ１２、Ｆｃ２２が計測され、その増分、即ち、制御入力Δｙｍ１及びΔｙｍ２を共に与えたときの計測値Ｆｃ１２、Ｆｃ２２と、制御入力Δｙｍ１のみを与えたときの計測値Ｆｃ１１、Ｆｃ２１との差Ｆｃ１２−Ｆｃ１１、Ｆｃ２２−Ｆｃ２１から、ΔＦ１２、ΔＦ２２が算出される。即ち、
ΔＦ１２＝Ｆｃ１２−Ｆｃ１１、
ΔＦ２２＝Ｆｃ２２−Ｆｃ２１
によりΔＦ１２、ΔＦ２２が算出される。そしてこれらの値からＪ１２とＪ２２が計算され、ヤコビアンＪが求まる。
【００６０】
なお、上記の例では、先に制御入力Δｙｍ１を与え、次に制御入力Δｙｍ１を与えたままで制御入力Δｙｍ２を与えているが、この順序を逆にして、先に制御入力Δｙｍ２を与え、次に制御入力Δｙｍ２を与えたままで制御入力Δｙｍ１を与えても、同様の結果が得られる。
【００６１】
Ｊ^−１をＪの逆行列とすると、式（２）は
ΔＹ＝Ｊ^−１・ΔＦ　．．．（３）
と変形できる。
【００６２】
各荷重点Ｑｉに加える所望の力をＰｉとすると、状態Ｃを基準とする所望の増分ΔＰｉと、状態Ｃにおいて各荷重点Ｑｉに加わる力Ｆｃｉとの間には以下の関係がある。
ΔＰｉ＝Ｐｉ−Ｆｃｉ
上式により、所望の増分ΔＰｉを求める。すべての荷重点Ｑｉについての所望の増分ΔＰｉを行列で表わしたものとΔＰとし、式（３）のΔＦをΔＰで置き換え、ヤコビアンＪの逆行列Ｊ^−１との積を求めると、移動部材３５の制御変位量ΔＹが計算される。この制御変位量ΔＹは、状態Ｃを基準とする状態Ｄへの変位量を示すものであり、ΔＹだけ移動部材３５を移動させる。これにより状態Ｃから状態Ｄへの移行が行われる。
【００６３】
第三の工程では制御変位量ΔＹを計算し、この値に基づいて移動部材３５を移動させ状態Ｃから状態Ｄに移行させる。
【００６４】
以上、荷重点Ｑｉの数が２である場合について説明したが、荷重点の数がｎである場合も同様である。この場合、式（１）は次式（４）、（５）に拡張したものとなる。
【００６５】
【数６】

【００６６】
Ｊｉｊ＝ΔＦｉｊ／Δｙｍｊ　．．．（５）
【００６７】
ヤコビアンＪの求め方は、荷重点Ｑ１、Ｑ２、…、Ｑｎ（位置Ｘ１、Ｘ２、…、Ｘｎ）に対応する移動部材３５を順次、所定量Δｙｍ１、Δｙｍ２、…Δｙｍｊ移動させる毎にΔＦｉｊを求め、式（５）から順次Ｊｉｊを計算する。
【００６８】
なお、荷重点Ｑ１、Ｑ２、…、Ｑｎに対応する移動部材３５を移動させる順序は、任意である。例えば、フレーム部材の一端から他端へと言う順に従う必要はない。
【００６９】
ヤコビアンＪ　が求まったら式（３）にヤコビアン　Ｊの逆行列Ｊ^−１と所望の力の増分ΔＰを代入して移動部材３５の制御変位量ΔＹを計算し、この値を状態Ｃから状態Ｄへの移行のための移動量（ΔＹｄｃ）とし、この移動量だけ移動部材３５を移動させ状態Ｃから状態Ｄに移行させる。
【００７０】
この状態Ｄで（即ちフレーム４に力を加えたまま）上方（Ｚ方向）に突き上げる。上方では色選別電極素体３が矢印の方向（Ｙ方向）に引張られて平面または所定の曲率の面に形成されるとともにフレーム４との相対位置決めが行われている。フレーム部材４ａを色選別電極素体３に所定の圧接力で圧接させた後、シーム溶接電極１５をフレーム４ａと色選別電極素体３の圧接部に下降させて、シーム溶接電極１５に通電しながらＸ方向に移動させて色選別電極素体３とフレーム部材４ａをシーム溶接する。この処理が、特許請求の範囲のステップ（ｄ）に対応し、以下の説明では第四の工程とも呼ばれる。最後にフレーム４に加えた力を解除するとフレーム４ａが力を加える前の元の状態に戻ろうとする復元力が働き、色選別電極素体３に張力が付与される。
【００７１】
次に上記の状態Ａから状態Ｂに導く工程（第一の工程）で加えられる初期荷重Ｆ０ｉについて説明する。フレーム部材４ａの各荷重点Ｑｉに対応して設けられた移動部材３５の変位と、各荷重点Ｑｉに加えられる力の関係は、図６に示すように、状態Ｄを含む所定の範囲ＬＲにおいては、線形であるが、それ以外の範囲では、線形的でないか、或いは線形的であっても状態Ｄを含む範囲とは連続していないことが多い。上記のようにヤコビアンを求めて，所望の制御変位量を求める方法は、状態Ｄを含む線形関係の範囲で状態Ｂから状態Ｃへの変形、即ち制御入力Δｙｍｉ（ｉ＝１〜ｎ）を与えることによる変形を行なう必要がある。そこで、状態Ｂは、状態Ｄを含む線形関係の範囲ＬＲ内に位置することが条件となる。状態Ａから状態Ｂへの変形のために加えられる初期荷重Ｆ０ｉは、上記の点を考慮して定められる。
【００７２】
例えば、図６に示すように状態Ｄにおける所望の力Ｐｉの１／３程度以上で、状態Ｄを含む線形範囲が始まるのであれば、所望の力Ｐｉの１／３（或いはそれより若干大きい力）を加えることにより状態Ｂをもたらせば良い。
【００７３】
しかしながら、初期荷重を上記のように設定するだけでは、制御変位量の算出を十分に高精度に行なうことができない場合がある。これは状態Ｂでの初期荷重値Ｆ０ｉ（ｉ＝１〜ｎ）が適切な範囲にないと、制御入力としてΔｙｍｊを与えた時に他の荷重点の荷重がゼロまたはゼロ近傍に落ちてしまう可能性があるためである。簡単のため、図５で用いた一対の対向するフレーム部材４ａの外側面４ｃに荷重点を２点設定した場合で説明すると、初期荷重値Ｆ０１、Ｆ０２が適切な範囲にないと、制御入力としてΔｙｍ１を与えた時に生じる荷重点Ｑ２の変位量Δｙ２１によって、当接部材２５、２６の双方がフレーム部材４ａから離れてしまい、荷重点Ｑ２の荷重がゼロまたはゼロ近傍に落ちてしまう。制御入力としてΔｙｍ２を与えた時も同様の現象が起こりうる。このように、荷重点の荷重がゼロまたはゼロ近傍に落ちてしまうと、移動部材の変位量と荷重点に加わる力の変化量との関係式、すなわちヤコビアンＪを正確に求めることができない。荷重点の数をｎ個に拡張しても同様のことがいえる。
【００７４】
そこで、ヤコビアンＪを求める際に各荷重点の荷重がゼロまたはゼロ近傍に落ちることのないようにするための、状態Ｂでの初期荷重値について考える。
【００７５】
まず、フレーム部材４ａの断面二次モーメントをＩ［ｍｍ^４］、フレーム部材４ａのＸ方向の長さ（一対のフレーム部材４ｂに固定された部分相互間の距離）をＬ［ｍｍ］、フレーム部材４ａの一端（一対のフレーム部材４ｂの一方に固定された部分）から荷重点ＱｉまでのＸ方向の距離をＸｉ［ｍｍ］、フレーム部材４ａのヤング率をＥ［ｋｇｆ／ｍｍ^２］、荷重点Ｑｉにおける弾性部材３６の弾性係数をＫｉ［ｋｇｆ／ｍｍ］とする。荷重点Ｑｉにおけるフレーム部材４ａの弾性係数（フレーム部材４ａが互いに接近する方向の変形についての弾性係数）Ｒｉ［ｋｇｆ／ｍｍ］は次式（６）で求めることができる。
【００７６】
Ｒｉ＝３Ｅ・Ｉ・Ｌ／｛Ｘｉ^２・（Ｌ−Ｘｉ）^２｝　．．．（６）
【００７７】
また、ある荷重点Ｑｊにおいて制御入力としてΔｙｍｊを与えた時の、荷重点Ｑｊにおけるフレーム変位量Δｙｊｊは次式（７）で求められる。
【００７８】
Δｙｊｊ　＝Δｙｍｊ・Ｋｉ／（Ｒｊ＋Ｋｊ）　．．．（７）
【００７９】
このとき、荷重点Ｑｊ以外の荷重点Ｑｉにおけるフレーム変位量Δｙｉｊは、荷重点Ｑｊにおけるフレーム変位量Δｙｊｊより小さいことは明らかである。
【００８０】
ヤコビアンＪを求める際に各荷重点の荷重がゼロまたはゼロ近傍に落ちないようにするためには、初期荷重付与状態での荷重点Ｑｉにおける弾性部材３６の撓み量Ｄｉが前記フレーム変位量Δｙｉｊより大きければよい。ヤコビアンＪを求める第二の工程では、荷重点Ｑｊ（ｊ＝１、２、…、ｎ）を順次所定量Δｙｍｊだけ変位させていくため、
【００８１】
【数７】

【００８２】
としてやるとよい。ここで、右辺は、すべての荷重点（Ｑｊ（ｊ＝１〜ｎ））において移動部材を順次移動させる間の各荷重点（Ｑｉ）のフレーム部材の変位量の累算値を表わす。本実施の形態においては、各荷重点における力を測定しており、その力は弾性部材の撓み量と弾性係数を掛け合わせた値と等しい。そこで式（８）の両辺に弾性部材の弾性係数Ｋｉを掛けると、
Ｄｉ×Ｋｉ　≧　Ｋｉ×Σ［｛Ｋｊ／（Ｒｊ＋Ｋｊ）｝×Δｙｍｊ］　．．．（９）
上式（９）の左辺は、荷重点Ｑｉにおいて、弾性部材及びフレーム部材４ａに掛かる力Ｆ０ｉに等しい。右辺を初期荷重指標Ｓｉとおく。即ち、
【００８３】
【数８】

【００８４】
初期荷重Ｆ０ｉをこの初期荷重指標Ｓｉよりも大きくすることで、第二の工程（ヤコビアンＪを求める工程）で各荷重点の荷重がゼロまたはゼロ近傍に落ちなくなる。
【００８５】
以上のとおり、各荷重点において、初期荷重Ｆ０ｉを初期荷重指標Ｓｉより大きく設定することにより、全ての荷重点の荷重がゼロまたはゼロ近傍に落ちることなく正確にヤコビアンＪを求めることができ、その結果、任意の荷重点Ｑｉに加わる力Ｆｉを所望の力Ｐｉとするための制御変位量を高精度に算出することができる。
【００８６】
なお、本実施の形態では、状態Ｃよりも状態Ｄの方が変位量が大きいが、上記の計算方法自体は、状態Ｃよりも状態Ｄの方が変位量が小さい場合にも適用できる。但し、この場合、状態Ｄよりも変形量が大きい状態Ｃ（図６に「状態Ｃ’」として示してある）が状態Ｄを含む線形的関係の範囲内にあることが条件である。ただし、一般的には、フレームは軽量化のため、状態Ｄにおいて、塑性変形の限界近傍となるように設計されており、状態Ｄを超えると、状態Ｄを含む線形関係の範囲の上限を超えることが多い。
【００８７】
実施の形態２．
上記の実施の形態１では、先に制御入力Δｙｍ１を与え、次に制御入力Δｙｍ１を与えたままで制御入力Δｙｍ２を与えるというように、一つの移動部材を移動させて、元の位置（状態Ｂにおける位置）に戻すことなく、別の移動部材を移動させることを繰り返しているが、このようにする代わりに、一つの荷重点、例えば荷重点Ｑ１の移動部材を変位させて、荷重点Ｑ１におけるフレーム部材の変位とこれに加わる力Ｆ１を計測した後、荷重点Ｑ１の移動部材を元に戻し、次に別の荷重点、例えば荷重点Ｑ２の移動部材を変位させるというように、各荷重点Ｑｉの移動部材を順次変位させては元に戻しながらヤコビアンＪを求めることもできる。この場合は、上記と同様の考え方から初期荷重指標Ｓｉは次式（１１）のように求められる。
【００８８】
【数９】

【００８９】
ここで、右辺は、第二の工程において、荷重点（Ｑｊ（ｊ＝１〜ｎ））の移動部材を個々に移動させたことによる各荷重点（Ｑｉ）のフレーム部材の変位量の最大値を表わす。そして、初期荷重Ｆ０ｉを式（１１）で求めた初期荷重指標Ｓｉ以上の値に設定する。このようにすれば、第二の工程における、各移動部材の移動に起因するフレーム部材の変位量のうちの最大のものよりも、初期荷重付与状態における弾性部材の撓み量Ｄｉを大きくすることができる。
【００９０】
この場合も、各荷重点において、初期荷重Ｆ０ｉを式（１１）で定義される初期荷重指標Ｓｉより大きく設定することにより、全ての荷重点の荷重がゼロまたはゼロ近傍に落ちることなく正確にヤコビアンＪを求めることができる。
【００９１】
なお、上記のように、一つの荷重点の移動部材を変位させて、その荷重点のフレーム部材の変位とこれに加わる力を計測した後、その荷重点の移動部材を元に戻し、次に別の荷重点の移動部材を変位させるというように、各荷重点の移動部材を順次変位させては元に戻しながらヤコビアンＪを求める場合には、上記の「状態Ｂ」と「状態Ｃ」が等しくなる。
【００９２】
上記の実施の形態１や実施の形態２によれば、フレームの剛性のばらつきが大きい場合でも、Ｓｉを初期荷重に対する指標とし、Ｓｉより十分大きな値を初期荷重として与えることで、全ての荷重点の荷重がゼロまたはゼロ近傍に落ちることなく正確にヤコビアンＪを求めることができる。
【００９３】
なお、状態Ａから状態Ｂに移行させるに際し、フレーム部材４のすべての荷重点Ｑｉにおいて加える力Ｆ０ｉが所定の値（初期荷重指標）Ｓｉを超える移動部材のＹ方向の位置を予め設定することができる場合には、加える力Ｆ０ｉによって移動部材の移動を制御せず、この設定位置に移動部材を移動させることとしても良い。このようにすれば、状態Ａから状態Ｂへの移行時間を短縮できる。例えばフレーム４の幅、即ちＹ方向寸法（二つのフレーム部材４ａの外側面４ｃの間隔）に許容誤差範囲内でバラツキがある場合、移動部材を所定の設定位置に移動させたとき、そのフレーム幅が狭い程、フレームが受ける力は小さいので、フレームの幅が上記許容誤差範囲内の最小値であるフレームにおいても、上記のように、すべての荷重点Ｑｉにおいて加える力Ｆ０ｉが所定の値Ｓｉを超える移動部材のＹ方向の位置を予め設定することができる場合には、上記の設定位置に移動部材を移動させることとしても良い。但し、フレーム４の幅が許容誤差範囲内の最大値であるフレームの場合に、上記の所定の設定位置まで移動部材を上記設定位置に移動させると、フレームに塑性歪みを与えるのであれば、そのような制御（設定位置まで移動部材を所定の設定位置に移動させる制御）は適用できない。
【００９４】
また、移動部材３５の変位量を測定する手段に接触式変位センサを用いたが、レーザ変位計などの非接触変位センサを用いても同様の作用、効果が得られる。
【００９５】
さらに、モータ３１の代わりにエンコーダを内蔵するサーボモータを使用し、エンコーダからのモータ回転量を移動部材３５の変位量に変換して移動部材３５の変位量を求める場合でも、同様の作用、効果が得られる。
【００９６】
さらにまた、図１８に示すフレームを用いる場合は、フレーム部材４ａの長手方向両端部以外の荷重点に加える力がフレーム部材４ｂの曲げに寄与する分は、極めて小さく、誤差として扱える。そこで、上記した第一の工程に先立って、両端部の荷重点Ｑｉに、所望の力を加える工程（第五の工程）を実施し、然る後、両端部以外の荷重点Ｑｉについて、上記した第一の工程、第二の工程及び第三の工程による処理を行なう。即ち、最初の両端部の荷重点に力を加える工程（両端部に同時に力を加えることとしても良く、一方を先にしても良いが、生産性の面から同時に行なうのが望ましい）では、力センサ２９で計測される力が所望の値となるまで移動部材を移動させる。（この時、両端部の荷重点で圧縮力を加える時は、ヤコビアンＪを求めて圧縮力を加えても良い。）
【００９７】
次に両端部以外の荷重点に力を加えるに際して、ヤコビアンＪを求める。そして、このように求めたヤコビアンＪを用いて各荷重点（両端部以外の荷重点Ｑｉ）に加える力を所望の値に制御する。
【００９８】
このように工程を分割した場合でも、前記両端部以外の荷重点において、初期荷重Ｆ０ｉを初期荷重指標Ｓｉより大きく設定することにより、全ての荷重点の荷重がゼロまたはゼロ近傍に落ちることなく正確にヤコビアンＪを求めることができる。
【００９９】
実施の形態３．
次にこの発明の実施の形態３を説明する。本実施の形態の方法を実施するための装置の構成や動作の概要は実施の形態１と同様である。異なるのは以下の点である。即ち、状態Ｂ（すなわち初期荷重付与状態）で初期荷重Ｆ０ｉ（ｉ＝１〜ｎ）を与え、状態Ｃに移行する過程で荷重点Ｑｉの移動部材を順次変位させては元に戻しながらヤコビアンＪを求め、ヤコビアンＪの逆行列Ｊ^−１と所望の力Ｐｉ（ｉ＝１〜ｎ）から移動部材３５の制御変位量Ｙｉ（ｉ＝１〜ｎ）を計算し、この値に基づいて移動部材３５を移動させ状態Ｃから状態Ｄに移行させるといった一連の工程において、初期荷重Ｆ０ｉ（ｉ＝１〜ｎ）の値に対する（即ち、ある値の初期荷重Ｆ０ｉを与え、その後移動部材を所定の変位量だけ変位させて変位と荷重との関係を求め、これを元に所望の荷重を生じる制御変位量を求めて、この制御変位量に基づいて移動部材を移動させることによって生じる）状態Ｄでの荷重Ｆｄｉ（ｉ＝１〜ｎ）を測定し、その荷重制御精度すなわち荷重Ｆｄｉ（ｉ＝１〜ｎ）と所望の力Ｐｉ（ｉ＝１〜ｎ）との差を評価した。その結果の一部を図７の表１に示す。この測定では、荷重点は６点とし、また測定条件をそろえるため状態Ｂから状態Ｃに移行する際の移動部材３５の移動量は一定とした。
【０１００】
状態Ｄでの荷重の規格は、所望の力の値を中心に±２０％以内の範囲であり、図７の表１より、初期荷重の所望の荷重に対する倍率において、各荷重点でのばらつきの範囲が４０％以下であれば、この規格を満足することが分かる。すなわち、初期荷重をすべての荷重点に共通の定数Ｔを用いて、
（Ｔ−０．２）×Ｐｉ　≦　Ｆ０ｉ　≦（Ｔ＋０．２）×Ｐｉ　．．．（１２）
の範囲に設定すれば、この規格を満足することができる。
【０１０１】
また、以下の式
（Ｔ−０．１）×Ｐｉ　≦　Ｆ０ｉ　≦（Ｔ＋０．１）×Ｐｉ　．．．（１３）
０．８　≦Ｔ　≦　１．０　．．．（１４）
の様に設定することで、所望の力の値を中心に±１０％の範囲にするといった厳しい規格にも対応できる。
【０１０２】
以下、この結果について説明する。図８及び図９は、説明を簡単にするために、一対の対向するフレーム部材の外側面に荷重点を２点設定し、この荷重点に加わる力の変化について説明する模式図である。図８及び図９で、符号４ｃ及び３６は、図３と同じくフレーム部材４ａの外側面、及び圧縮バネを示す。符号３５−１及び３５−２は、図３の移動部材３５を示すが、区別のため、荷重点Ｑ１に設けられたものに符号３５−１が、荷重点Ｑ２に設けられたものに符号３５−２が付されている。但し、上記のような区別の必要のないときは、符号３５が用いられる。また、Ｋｉは荷重点Ｑｉにおける圧縮バネ３６のバネ定数である。
【０１０３】
点線の位置が、状態Ｂすなわち初期荷重付与状態を示している。図８は初期荷重Ｆ０１、Ｆ０２が互いにほぼ同じ値である場合、図９は初期荷重Ｆ０１、Ｆ０２が互いに異なる値である場合である。また、実線の位置が、ヤコビアンを求めるために荷重点Ｑ１の移動部材をΔｙｍ１変位させた時のフレーム部材の外側面の位置であり、そのときの荷重点Ｑ１およびＱ２における、フレーム部材４ａの外側面４ｃの初期荷重付与状態からの変位量をΔｙ１１、Δｙ２１、荷重の変化量をΔＦ１１、ΔＦ２１とすると、以下の式が成り立つ。
【０１０４】
Ｊ１１＝ΔＦ１１／Δｙｍ１、　ΔＦ１１＝Ｋ１・（Δｙｍ１−Δｙ１１）
Ｊ２１＝ΔＦ２１／Δｙｍ１、　ΔＦ２１＝−Ｋ２・Δｙ２１
【０１０５】
ここで、図８における荷重点Ｑ１およびＱ２の変位量と図９における荷重点Ｑ１およびＱ２の変位量とは明らかに異なる。移動部材の変位量は図８、図９ともにΔｙｍ１で一定であるから、図８の初期荷重付与状態から求めたヤコビアンの構成要素Ｊ１１、Ｊ２１と図９の初期荷重付与状態から求めたヤコビアンの構成要素Ｊ１１、Ｊ２１は、異なる値となる。図示しないが、荷重点Ｑ２の移動部材をΔｙｍ２変位させた時に求められるヤコビアンの構成要素Ｊ１２、Ｊ２２にも同様のことがいえる。
【０１０６】
以上、簡単のため荷重点の数を２個で説明してきたが、荷重点の数をｎ個に拡張しても同様のことがいえる。
【０１０７】
これらの結果より、各荷重点における荷重の相対比（各荷重点におけるフレーム撓み量の相対比と考えてもよい）が異なると、その状態から求められたヤコビアンも異なることが分かる。また、各荷重点における荷重の絶対値が異なっていても、荷重の相対比が等しければ、ほぼ同等のヤコビアンが求められることが明らかである。ヤコビアンは状態Ｃ（もしくは状態Ｂ）から状態Ｄに移行するための制御入力を求めるためのものであるから、初期荷重の各荷重点における相対比と所望の力の各荷重点における相対比を同等にすれば、荷重制御精度が向上すると考えられる。
【０１０８】
図７の表１の結果は、このことを証明するものであり、式（１２）もしくは式（１３）は状態Ｄでの荷重の規格を満足するために必要な初期荷重の相対比の同等性を数式化したものである。
【０１０９】
以上のとおり、初期荷重Ｆ０ｉが、荷重点Ｑｉに加える前記所望の力Ｐｉに対し、すべての荷重点に共通の定数Ｔを用いて、
（Ｔ−０．２）×Ｐｉ　≦　Ｆ０ｉ　≦（Ｔ＋０．２）×Ｐｉ　…（１２）
の範囲にあるように設定すれば、所望の力に対して高精度に荷重を制御することができる。
【０１１０】
また、初期荷重Ｆ０ｉが、荷重点Ｑｉに加える前記所望の力Ｐｉに対し、すべての荷重点に共通の定数Ｔを用いて、
（Ｔ−０．１）×Ｐｉ　≦　Ｆ０ｉ　≦（Ｔ＋０．１）×Ｐｉ　…（１３）
の範囲にあり、かつ前記すべての荷重点に共通の定数Ｔを
０．８≦Ｔ≦１．０　…（１４）
に設定することで、所望の力に対してより高精度に荷重を制御することができる。
【０１１１】
実施の形態４．
本実施の形態は、実施の形態１と同様、第二の工程、即ちステップ（ｂ）において、各移動部材を移動させた後、該移動部材を元の位置に戻すことなく別の移動部材を移動させることを繰り返し、前記移動部材を順に移動させる場合に関する。
上記の実施の形態３においては、初期荷重Ｆ０ｉが、式（１２）や式（１３）及び式（１４）満たすようにした。即ち、初期荷重Ｆ０ｉを、
（Ｔ−０．２）×Ｐｉ以上で、且つ
（Ｔ＋０．２）×Ｐｉ以下であるよう、
或いは、
（Ｔ−０．１）×Ｐｉ以上で、且つ
（Ｔ＋０．１）×Ｐｉ以下（但し、０．８≦Ｔ≦１．０）であるように
定めた。
第二の工程、即ちステップ（ｂ）において、各移動部材を移動させた後、該移動部材を元の位置に戻すことなく別の移動部材を移動させることを繰り返し、前記移動部材を順に移動させる場合には、初期荷重が上記のような条件を満たすだけでなく、ステップ（ｂ）における各移動部材の移動の前に、各荷重点に掛かる荷重Ｆｉｊが上記と同様の条件を満たすようにするのが望ましい。
即ち、ステップ（ｂ）における各移動部材の移動の前に、各荷重点に掛かる荷重Ｆｉｊが、
（Ｔ−０．２）×Ｐｉ以上で、且つ
（Ｔ＋０．２）×Ｐｉ以下であるように定めるのが望ましく、
さらに、
（Ｔ−０．１）×Ｐｉ以上で、且つ
（Ｔ＋０．１）×Ｐｉ以下（但し、０．８≦Ｔ≦１．０）であるように
定めるのが一層望ましい。
上記のように定めることで、ステップ（ｂ）において、各移動部材を移動させた後、該移動部材を元の位置に戻すことなく別の移動部材を移動させることを繰り返し、前記移動部材を順に移動させる場合でも、所望の力に対してより高精度に荷重を制御することができる。
【０１１２】
なお、実施の形態１及び実施の形態２について述べたのと同様の改変が、実施の形態３及び実施の形態４にも適用可能である。
【０１１３】
【発明の効果】
請求項１に記載の製造方法によれば、上記ステップ（ｂ）において、すべての荷重点の荷重がゼロまたはゼロ近傍に落ちることなく正確にヤコビアンＪを求めることができる。その結果任意の荷重点Ｑｉに加わる力Ｆｉを高精度に所望の値Ｐｉにすることができ、色選別電極素体に張力分布を高精度に付与することができる。
また、前記ステップ（ｂ）において、各移動部材を移動させた後、該移動部材を元の位置に戻すことなく別の移動部材を移動させることを繰り返し、前記複数の移動部材を順に移動させるので、ステップ（ｂ）に要する時間を短くすることができる。
【０１１４】
請求項２の製造方法によれば、荷重点Ｑｉを順次変位させては元に戻しながらヤコビアンＪを求める場合でも、各荷重点において初期荷重Ｆ０ｉを式（１１）で定義される初期荷重指標Ｓｉより大きく設定することにより、全ての荷重点の荷重がゼロまたはゼロ近傍に落ちることなく正確にヤコビアンＪを求めることができる。その結果任意の荷重点Ｑｉに加わる力Ｆｉを高精度に所望の値にすることができ、色選別電極素体に張力分布を高精度に付与することができる。
また、各移動部材を移動させた後、該移動部材を元の位置に戻し、その後別の移動部材を移動させることを繰り返し、前記移動部材を順に移動させることとしているので、ステップ（ｂ）における各移動部材の変位量を比較的大きくすることができ、各移動部材を変位させたときの各荷重点における力の変化量を比較的大きくすることができ、測定を確実に正確に行なうことができる。
【０１１５】
請求項３の製造方法によれば、比較的簡単な計算により、弾性係数を求めることができる。
【０１１６】
請求項４の製造方法によれば、荷重点Ｑｉに加える荷重Ｆｉを所望の力Ｐｉに十分に近い値に、即ち高精度に制御することができ、その結果色選別電極素体に張力分布を高精度に付与することができる。
【０１１７】
請求項５の製造方法によれば、ステップ（ｂ）において、各移動部材を移動させた後、該移動部材を元の位置に戻すことなく別の移動部材を移動させることを繰り返し、前記移動部材を順に移動させる場合に、荷重点Ｑｉに加える荷重Ｆｉを所望の力Ｐｉに十分に近い値に、即ち高精度に制御することができ、その結果色選別電極素体に張力分布を高精度に付与することができる。
【０１１８】
請求項６の製造方法によれば、荷重点Ｑｉに加える前記所望の力Ｐｉに対し、すべての荷重点に共通の定数Ｔを用いて、初期荷重Ｆ０ｉを、０．８×Ｐｉ乃至Ｐｉの範囲内のものとすることで、各荷重点に加える力を所望の力Ｐｉにより一層近い値に、即ちより高精度に制御することができ、色選別電極素体に張力分布をより高精度に付与することができる。
【０１１９】
請求項７の製造方法によれば、ステップ（ｂ）において、各移動部材を移動させた後、該移動部材を元の位置に戻すことなく別の移動部材を移動させることを繰り返し、前記移動部材を順に移動させる場合に、荷重点Ｑｉに加える荷重Ｆｉを所望の力Ｐｉにより一層近い値に、即ちより高精度に制御することができ、その結果色選別電極素体に張力分布をより高精度に付与することができる。
【０１２０】
請求項８の製造方法によれば、移動部材の変位とフレーム部材に加わる力との関係が、力を加えない状態からフレーム部材に加わる力が所望の値となる状態までの全範囲にわたって連続的でない場合にも、フレーム部材に加わる力が所望の値となる状態を含む直線的関係の範囲がある限り、ステップ（ｂ）による処理を正確に行なうことができ、従って所望の力を生じさせる移動部材の変位を正確に求めることができる。
【０１２１】
請求項９の製造方法によれば、フレーム部材に加える力の制御時間を短縮できる。また、色選別電極素体に平均的な張力を与える工程と、張力の分布を与える工程を分けることになり、色選別電極の製造現場において、色選別電極素体の張力に関する品質異常が起こった場合、この原因追求と対策を行いやすくなる効果が得られる。
【０１２２】
請求項１０の製造方法によれば、力を計測しその差分を求めることで、力の増分を求めることができるので、広く用いられている力センサで測定を行なうことができる。
【０１２３】
また、請求項１乃至１０の製造方法で得られた色選別電極を備えることで、画像の乱れが生じにくい高品質なカラー陰極線管を提供することができる。
【図面の簡単な説明】
【図１】表示画面の上下方向に平行な方向に見た、フレームの変形過程を示す図である。
【図２】表示画面に垂直な方向に見た、フレームの変形過程を示す図である。
【図３】本発明の実施の形態１による、色選別電極製造装置の機構部を示す斜視図である。
【図４】実施の形態１による、色選別電極製造装置の制御系を示すブロック図である。
【図５】２つの荷重点に加える力の制御について説明する図である。
【図６】移動部材の変位とフレーム部材に加わる力の関係の一例を示すグラフである。
【図７】計算により求めた位置へ移動部材を変位させたときの荷重の測定結果を示す表である。
【図８】２つの荷重点の力の制御と初期荷重について説明する図である。
【図９】２つの荷重点の力の制御と初期荷重について説明する図である。
【図１０】カラー陰極線管の構成を示す図である。
【図１１】色選別電極の構成を示す図である。
【図１２】色選別電極素体の一例を示す図である。
【図１３】色選別電極素体の他の例を示す図である。
【図１４】電子ビームが蛍光体に投射させる状態を示す図である。
【図１５】色選別電極素体に付加される張力分布を示すグラフである。
【図１６】フレームの一例を示す図である。
【図１７】フレームの他の例を示す図である。
【図１８】フレームのさらに他の例を示す図である。
【図１９】従来の色選別電極の製造装置の一例を示す斜視図である。
【図２０】従来の製造装置の動作を示す図である。
【符号の説明】
１　カラー陰極線管、　２　色選別電極、　３　色選別電極素体、　３ａ　スリット、　３ｂ　孔、　４　フレーム、　４ａ　フレーム部材、　４ｂ　フレーム部材、　５　パネル、　６　蛍光体、　７　電子銃、　８　電子ビーム、　９ファンネル、　１０　偏向ヨーク、　１１　加圧子、　１２　圧力センサ、　１３　油圧シリンダ、　１４　回転軸、　１５　シーム溶接電極、　１６　移動ベース、　１７　移動ベース、　１８　移動ベース、　１９　移動ベース、　２０　移動ベース、　２１　移動ベース、　２２　レール、　２３　レール、　２４　板、　２５　当接部材、　２６　当接部材、　２７　板、　２８　板、　２９　力センサ、　３０　移動部材、　３１　モータ、　３２　ボールネジ、　３３　軸受、　３４　ナット、　３５　移動部材、　３６　圧縮バネ、　３７　貫通穴、　３８　貫通穴、　３９　貫通穴、　４０　接触式変位センサ。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method of manufacturing a color selection electrode for a color cathode ray tube, and more particularly to a method of manufacturing a color selection electrode in which a tension is applied to a color selection electrode body and a color cathode ray tube.
[0002]
[Prior art]
FIG. 10 shows the configuration of a color cathode ray tube 1 used for a display device for a television or a computer, and FIG. 11 shows the configuration of a color selection electrode 2. 10 and 11, the funnel 9 is glass-fused to the panel 5. The color selection electrode 2 is formed by applying a predetermined tension to a frame 4 formed in a substantially rectangular frame shape by forming a color selection electrode body 3 made of a thin metal plate having a large number of slits 3a (FIG. 12) or holes 3b (FIG. 13). And welded and fixed. The color selection electrode body 3 is formed on a predetermined curved surface or flat surface, and is arranged at a predetermined interval from the inner surface of the panel 5 so as to face the inner surface of the panel 5. In the manufacturing process of the color cathode ray tube 1, the color selection electrode element body 3 is used as a screen when a phosphor 6 of three colors of red, green, and blue is applied and formed on the inner surface of the panel, and is used as a screen. After the cathode ray tube 1 is completed, an electron beam 8 for three colors emitted from the electron gun 7 and whose trajectory is controlled by the deflection yoke 10 is selected and passed through the slit 3a or the hole 3b and passed to the corresponding phosphor 6 Irradiate.
[0003]
For the following description, the tube axis direction of the color cathode ray tube 1 is defined as a Z direction, the vertical direction as a display screen is defined as a Y direction, and the horizontal direction is defined as an X direction. Corresponding directions in the color selection electrode 2 are as follows: the Z direction is the normal direction at the center of the surface of the color selection electrode element body 3, the Y direction is the direction corresponding to the longitudinal direction of the slit 3a, ie, the vertical direction of the display screen. The width direction of 3a, that is, the left-right direction of the display screen is the X direction.
[0004]
If the size / shape accuracy of the surface of the color selection electrode 2 (color selection electrode body 3) or the size / shape accuracy of the slit 3a or the hole 3b formed in the color selection electrode body 3 is poor, the phosphor 6 is formed. The accuracy deteriorates to cause color unevenness, or the three-color electron beam 8 is not accurately projected on the corresponding phosphor 6 to deteriorate the color purity, resulting in poor image quality of the displayed image. Further, if the vibration amplitude of the color selection electrode element body 3 resonating with the vibration from the outside of the color cathode ray tube 1 is large or the vibration decay time is long, the displayed image may be disturbed beyond the limit and cannot be used. Become.
[0005]
The one having the slits 3a in the color selection electrode element body 3 is called an aperture grill system (FIG. 12), and the one having the holes 3b is called a shadow mask system (FIG. 13). In both cases, although the control values related to the design parameters are large and small, the color selection electrode element 3 is welded and fixed to the color selection electrode element welding part of the frame 4 without distortion as a basic requirement in order to prevent the image quality deterioration and image disturbance. In addition, it is necessary to apply an appropriate tension to the color selection electrode body 3.
[0006]
The tension applied to the color selection electrode body 3 will be described. If the tension is too high, it is added to the color selection electrode 2 in the blackening heat treatment (the treatment of forming triiron tetroxide film) of the color selection electrode 2, the bonding process between the panel 5 and the funnel 9, and the evacuation process in the color cathode ray tube 1. The temperature of the color selection electrode body 3 is raised by the heat of three hundred and several tens to four hundred and several tens degrees Celsius, and the load stress due to the tension exceeds the material strength of the color selection electrode body 3 at that temperature, and a large permanent distortion is generated. It occurs in the sorting electrode body 3. When the frame 4 holding the color selection electrode element 3 is distorted by heat, the dimensions and accuracy of the surface of the color selection electrode 2 (color selection electrode element 3) are deteriorated. On the other hand, if the tension is too low, the vibration amplitude of the color selection electrode element 3 increases (is likely to fluctuate), which causes image disturbance exceeding the use limit of the display device.
[0007]
The image disturbance will be described with reference to FIG. FIG. 14 shows a state in which the electron beam 8 is narrowed down by the slit 3 a of the color selection electrode element body 3 and is projected on the phosphor 6 formed on the inner surface of the panel 5. The left side of the figure shows the state of the center of the screen of the color cathode ray tube 1 in the X direction, and the right side of the figure shows the end of the screen in the X direction. Considering the Z direction (the normal direction of the panel 5 and the color selection electrode element body 3) and the X direction (the horizontal direction of the screen) separately, the projection angle of the electron beam 8 with respect to the Z direction is small at the center of the screen. Even if the color selection electrode body 3 to be represented vibrates in the Z direction and is displaced as shown by the dotted line (even if it fluctuates), it does not significantly affect the change in the projection position of the electron beam 8 onto the phosphor 6 and the X direction. Of the color selection electrode element body 3 (slit 3a) affects the variation of the projection position of the electron beam 8 onto the phosphor 6 (screen disturbance). The influence of the swing of the color selection electrode element body 3 (slit 3a) in the Z direction increases from the center to the edge of the screen, and the influence of the swing in the X direction is further added. In other words, the influence of the overall swing of the color selection electrode body 3 is smaller at the center of the screen than at the end, and the permissible value of the degree of swing of the color selection electrode body 3 is large. Can be set smaller than the end. The distribution of the tension of the color selection electrode body 3 is shown in FIG. The vertical axis σ indicates the tensile stress of a portion (referred to as a grid) between the slits 3a of the color selection electrode element body 3 and the horizontal axis X indicates the X direction of the color selection electrode 2 shown in FIG. Indicates the position. When the tension distribution is given to the color selection electrode element 3 in this way, the local vibration of the color selection electrode element 3 induced by external vibration is difficult to propagate to other places, and the attenuation of the local vibration once induced is accelerated. There is also an effect.
[0008]
In order to suppress the disturbance of the screen (the fluctuation of the color selection electrode body 3), the color selection is performed at a stress limit value at which the color selection electrode body 3 is not distorted by the heat added in the manufacturing process of the color cathode ray tube 1. It is conceivable that tension is applied to all parts of the electrode element body 3, but such tension is applied to all parts of the color selection electrode element 3, and the frame is heated by the heat added in the manufacturing process of the color cathode ray tube 1. In order to prevent the distortion of the frame 4, it is necessary to make the rigidity of the frame 4 extremely large, and the size and weight of the frame 4 become excessively large, so that the color selection electrode 2 is positioned in the color cathode ray tube 1. It becomes difficult to hold, and the manufacturing cost of the color selection electrode 2 increases.
[0009]
Therefore, as described above, the color selection electrode element body 3 is provided with the distribution of tension, and the rigidity of the frame 4 is suppressed as low as possible by utilizing the vibration damping effect. As described above, the tension distribution is given to the color selection electrode element body 3, and the target value and the tolerance (control accuracy) thereof are traded off with the rigidity of the frame 4 and the heat added in the manufacturing process of the color cathode ray tube 1. Is determined.
[0010]
If the control accuracy of the tension distribution of the color selection electrode element body 3 can be improved, the latitude in designing and manufacturing the color selection electrode 2 can be expanded, and the quality of the color cathode ray tube 1 can be improved and the cost can be reduced.
[0011]
The application of tension to the color selection electrode body 3 is generally performed by the following method. A plurality of load points are set on the outer side surfaces 4c of a pair of opposed frame members 4a of the frame 4 formed in a substantially rectangular frame shape, and a force is applied to the frame members 4a by applying a force to these load points. To hold the frame by bending it a predetermined amount. Above this, the color selection electrode body 3 is positioned relative to the frame 4 and is held by being pulled in two or four directions. In this state, the frame 4 is raised or the color selection electrode element 3 is lowered, and the color selection electrode element 3 and the pair of opposed frame members 4a are appropriately pressed against the color selection electrode element 3. Thereafter, the press-contact portions of the color selection electrode body 3 and the pair of opposed frame members 4a to the color selection electrode body 3 are welded by various methods such as seam welding or laser welding. Finally, when the force applied to the frame 4 is released, the frame 4 tries to restore the original state, and tension is generated in the color selection electrode element body 3. By variously setting the forces applied to the plurality of load points, it is possible to variously set the shape of the tension distribution applied to the color selection electrode body 3.
[0012]
The frame 4 is provided in a shape as shown in FIGS. As shown, forces are applied to the plurality of load points of the pair of opposed frame members 4a of the frame 4 as indicated by arrows. The number and position of the load points and the magnitude of the force applied to the load points are determined based on the required tension distribution of the color selection electrode element body 3.
[0013]
In the frame 4 shown in FIG. 16, when a force is applied to the load point of the frame member 4a, the frame member 4b connecting the frame member 4a is bent, and the frame member 4a is also bent around the connection portion with the frame member 4b. When the force applied to the load point is released, the restoring force of the frame member 4b, which tries to return to the state before the force is applied, gives an average tension which is a base to the color selection electrode body 3, and the frame member 4a The restoring force that tries to return to the state before applying the force gives the distribution of the tension. Since the distance between the frame members 4a and 4b is large in the Z direction and a bending moment is easily applied to the frame member 4b by applying a force to the frame member 4a, the bending of the frame member 4b is performed at both ends in the longitudinal direction of the frame member 4a. Not only the force applied to the load point but also the force applied to other load points greatly contributes. Therefore, it is relatively difficult to set the distribution of the force applied to each load point, but conversely, the force applied to each load point can be shared and distributed to give the base average tension to the color selecting electrode element 3. The force to be applied to the specific load point is not excessively large, and the frame member 4a is not caused to generate a strain that may deteriorate the surface accuracy of the color selection electrode body 3 and the size / shape accuracy of the slit 3a or the hole 3b. It is relatively easy to do.
[0014]
The frame 4 shown in FIG. 17 is obtained by reducing the manufacturing cost of the frame member 4b in the frame shown in FIG. 16, and the distance between the frame member 4b and the frame member 4a in the Z direction is smaller than the frame 4 shown in FIG. . Therefore, since it is difficult to apply a bending moment to the frame member 4b, the degree of contribution of the force applied to the load points at both ends in the longitudinal direction of the frame member 4a to the bending of the frame member 4b is greater than in the case of using the frame shown in FIG. The contribution of the force applied to the other load points is reduced. Therefore, it is necessary to increase the force applied to the load points at both ends as compared with the case of the frame shown in FIG. 16, and the distortion at both ends becomes large, so that the surface accuracy of the color selection electrode body 3 and the slits 3a or holes 3b deteriorates in size and shape accuracy.
[0015]
In the frame 4 shown in FIG. 18, the frame members 4a and 4b are hollow, and the manufacturing cost is further reduced and the weight is reduced as compared with the frame 4 shown in FIG. The distance between the frame member 4b and the frame member 4a in the Z direction is smaller than that of the frame 4 shown in FIG. 17, and the rigidity of the frame member 4a is low due to the hollow structure. The contribution of the force applied to the load points at both ends in the longitudinal direction becomes extremely large, and it is necessary to greatly increase the force applied to the load points at both ends. At both ends, distortion which leads to deterioration of the surface accuracy of the color selection electrode element body 3 and the size / shape accuracy of the slit 3a or the hole 3b is extremely likely to occur and often exceeds the allowable control limit. In addition, at locations other than the both ends, the surface accuracy of the color selection electrode body 3 and the slits 3a or holes are increased due to an increase in the amount of deformation of the frame member 4a due to a decrease in rigidity and an increase in local distortion near the load point due to the hollow structure. Since the strain which deteriorates the size / shape accuracy of 3b is likely to occur, the average tension value serving as the base of the color selection electrode element 3 must be reduced. A color cathode ray tube having a large arrangement pitch of the slits 3a or the holes 3b of the color selection electrode body 3 and a coarse pixel pitch of the display screen has a large permissible value of fluctuation induced by external vibration of the color selection electrode body 3. The application of the frame shown in FIG. 18 to the color selection electrode of such a color cathode ray tube is limited. For example, a color cathode ray tube for television use is a target.
[0016]
As described above, the frame 4 shown in FIGS. 16 to 18 has a degree that the frame member 4b is easy to bend, a degree that the force applied to each load point of the frame member 4a contributes to the bending of the frame member 4b, or The degree of distortion at or near the load point due to the application of a force to the member 4a is characterized by each shape. For example, in the frame 4 shown in FIG. If only the cross-sectional dimension of the frame member 4a is reduced, the flexibility of the frame member 4b, the degree to which the force applied to each load point of the frame member 4a contributes to the bending of the frame member 4b, or the force applied to the frame member 4a increases the load. The degree to which distortion occurs near the point or the load point should be handled in the same manner as the frame 4 in FIG. 17 or FIG. In order to describe this, it is necessary to show detailed physical properties and dimensions of each material, and since these vary widely, they are characterized and described with differences in shapes shown in FIGS. 16 to 18.
[0017]
The size and rigidity of the color selection electrode body 3 are controlled with high precision, and the factors that cause the tension distribution of the color selection electrode body 3 of the color selection electrode 2 to vary largely depend on the size and rigidity of the frame. In order to absorb the variation and manage the tension distribution of the color selection electrode element body 3 with high accuracy, the force applied to the load point of the frame must be controlled with high accuracy. As shown in FIGS. 16 to 18, as the shape of the frame 4 is changed, the manufacturing cost of the frame can be reduced. However, as described above, the force applied to the load points at both ends of the frame member 4 a is increased. There is a need. If the ratio of the variation is the same, the higher the tension value, the greater the variation in the tension. Therefore, with the change in the frame shape shown in FIGS. 16 to 18, the control accuracy of the force applied to the load points at both ends is improved. Need to be done. Further, in the case of the frame having the shape shown in FIG. 18, even at positions other than the both ends, the rigidity of the frame member 4 a is reduced and the variation in the force applied due to the hollow structure is caused by the variation in the deformation amount of the frame member 4 a and the local distortion near the load point. , And is reflected in the variation, the necessity of improving the control accuracy of the applied force is further increased. In addition, it is important to avoid stress concentration at specific load points.
[0018]
Japanese Patent Application Laid-Open No. 2002-42646 proposes a solution to the problem in manufacturing such a color selection electrode. This conventional technique sets a plurality of load points on the frame member 4a, detects the force acting on each load point, and controls the force applied to each load point so that each detected force value becomes a desired value. To do.
[0019]
FIG. 19 shows a schematic view of a main part of this prior art apparatus. In FIG. 19, pressure elements 11 are arranged at predetermined intervals along the longitudinal direction (X direction) of the frame member 4a, and a pressure sensor 12 is provided at a portion of each pressure element that contacts the frame member 4a. In the hydraulic cylinder 13, the tip of a rod protruding when oil is supplied is connected to the pressurizer 11. When the rod of the hydraulic cylinder 13 protrudes, the pressure sensor 12 presses the frame member 4 a about the rotation shaft 14 of the pressurizing element 11. The supply / discharge of hydraulic oil to / from the hydraulic cylinder 13 and the supply pressure are controlled by a control mechanism (not shown).
[0020]
[Problems to be solved by the invention]
However, since the frame member 4a is a continuous body, assuming that a plurality of arbitrary load points are Xi, when any force is applied to each of the load points Qi (i = 1, 2,..., N) When the force applied to one load point Q1 is increased / decreased to a desired force, the increase / decrease of this force causes the frame member 4a to approach / separate and increase / decrease the force applied to the load points Qi other than the load point Q1. I do. Next, of the other arbitrary load points Qi, when the force applied to the load point Q2 is increased or decreased to a desired force, the frame member 4a approaches / separates as described above, and the load point Q2 having the desired force is obtained. And the force applied to the load points Qi other than Q2 increases and decreases.
[0021]
That is, when a control input is given to one load point, not only does the control output value measured by the pressure sensor 12 at another load point fluctuate, but the control input value itself at another load point also fluctuates. As the number of load points increases, the control input / output at each load point becomes more complicated and the difficulty of control increases dramatically.
[0022]
Therefore, in order to converge the force applied to an arbitrary load point Qi to a desired value, it is necessary to set the control accuracy of the force applied to the arbitrary load point Qi low and to repeat the force control operation enormously. And significantly lower productivity. This cannot be achieved within the generally required takt time for manufacturing a color cathode ray tube.
[0023]
In order to solve the above-mentioned problems, a tension distribution is applied to the color selection electrode element body with high precision by absorbing individual dimensional variations and rigidity variations of the frame to avoid local distortion of the frame member. In order to provide a method for manufacturing a color selection electrode that can be used especially with excellent productivity and can withstand practical use, the color selection electrode body is welded to a pair of opposed frame members of a frame formed in a substantially rectangular frame shape. Previously, in a method of manufacturing a color selection electrode for applying a force in a direction approaching each other to a pair of opposed frame members, a plurality of load points Qi (i = 1 to n, n: (The total number of load points) is set, and a moving member that applies a force to the load point Qi via an elastic member having an elastic coefficient Ki is displaced by a predetermined amount independently from each other in the longitudinal direction, and an initial load F0i is applied to the moving member. Load application From the initial load applied state, the moving member is displaced by Δymi to determine the amount of change in the force applied to the load point Qi, and the difference between the amount of displacement of the moving member and the amount of change in the force applied to the load point is determined. A relational expression is obtained, and then the displacement amount of the moving member at which the force applied to the load point becomes a desired value is calculated from the relational expression as a control displacement amount (a target value of the displacement amount). A manufacturing method has been proposed in which the moving member is displaced to apply a desired force to the load point (Japanese Patent Application No. 2002-219152).
[0024]
In the proposed manufacturing method, the value of the initial load in the state where the initial load is applied affects the calculation accuracy of the control displacement amount. In order to apply the tension distribution to the color selection electrode element with higher accuracy, by applying an appropriate initial load, the relational expression between the displacement amount of the moving member and the change amount of the force applied to the load point can be improved. It is necessary to obtain it accurately and to increase the calculation accuracy of the control displacement amount.
[0025]
The present invention considers the above-described problems, and provides an initial load in an initial load application state to an appropriate value, so that a color distribution can be applied to a color selection electrode element body with higher accuracy. An object is to provide a method for manufacturing an electrode.
[0026]
[Means for Solving the Problems]
The method for producing a color selection electrode according to claim 1,
Color selection including fixing the color selection electrode element for a color cathode ray tube made of a metal thin plate having a slit or a hole through which an electron beam is formed to a pair of opposed frame members of a frame formed in a substantially rectangular frame shape. A method of manufacturing an electrode, comprising:
(A) Of a plurality of load points set at different positions in the longitudinal direction of the opposed frame member, at least load points other than the load points at both ends of the plurality of load points, the contact members respectively contacting the load points; Displacing each corresponding moving member via a separate elastic member and applying an initial load F0i, thereby applying a force in a direction in which the opposed frame members approach each other;
(B) From the state where the initial load is applied, the moving member is further displaced by a known displacement amount Δymi, and a force applied to a load point other than the both ends is measured. Obtaining a relational expression of a change in the force applied to the load points other than the both ends,
(C) calculating a target value of the amount of displacement of each of the moving members at which a force applied to a load point other than the both ends becomes a desired value Pi from the relational expression; Displacing by a target value;
(D) welding the color selection electrode body to the pair of mutually facing frame members while displacing the moving member in step (c).
Has,
In the step (b), after moving each moving member, repeatedly moving another moving member without returning the moving member to its original position, sequentially moving the moving member,
The initial load F0i at each load point Qi in the step (a) is
[Equation 3]

(here,
Ki is the elastic modulus of the elastic member at the load point Qi,
Kj is the elastic coefficient of the elastic member at the load point Qj (j is the number of the load point, j = 1 to n),
Δymj is the displacement of the moving member at each load point Qj in step (b),
Rj is an elastic coefficient of deformation of the pair of frame members at the load point Qj in the directions approaching each other.)
Is set to be equal to or more than the initial load index Si given by:
[0027]
The method for manufacturing a color selection electrode according to claim 2,
Color selection including fixing the color selection electrode element for a color cathode ray tube made of a metal thin plate having a slit or a hole through which an electron beam is formed to a pair of opposed frame members of a frame formed in a substantially rectangular frame shape. A method of manufacturing an electrode, comprising:
(A) Of a plurality of load points set at different positions in the longitudinal direction of the opposed frame member, at least load points other than the load points at both ends of the plurality of load points, the contact members respectively contacting the load points; Displacing each corresponding moving member via a separate elastic member and applying an initial load F0i, thereby applying a force in a direction in which the opposed frame members approach each other;
(B) From the state where the initial load is applied, the moving member is further displaced by a known displacement amount Δymi, and a force applied to a load point other than the both ends is measured. Obtaining a relational expression of a change in the force applied to the load points other than the both ends,
(C) calculating a target value of the amount of displacement of each of the moving members at which a force applied to a load point other than the both ends becomes a desired value Pi from the relational expression; Displacing by a target value;
(D) welding the color selection electrode body to the pair of mutually facing frame members while displacing the moving member in step (c).
Has,
In the step (b), after each moving member is moved, the moving member is returned to the original position, and then another moving member is repeatedly moved.
The initial load F0i in the step (a) is
(Equation 4)

(here,
Ki is the elastic modulus of the elastic member at the load point Qi,
Kj is the elastic coefficient of the elastic member at the load point Qj (j is the number of the load point, j = 1 to n),
Δymj is the displacement of the moving member at the load point Qj in the step (b),
Rj is an elastic coefficient of deformation of the pair of frame members at the load point Qj in the directions approaching each other.)
Is set to be equal to or more than the initial load index Si given by:
The method for manufacturing a color selection electrode according to claim 3 is the method according to claim 1 or 2,
The elastic modulus Rj of the frame member is
Ri = 3E · I · L / ｛Xi ² ・ (L-Xi) ² ｝. . . (6)
(here,
E is the Young's modulus of the frame member,
I is the second moment of area of the frame member,
Xi is a distance from one end of the frame member to the load point Qi,
L is the length of the frame member)
It is characterized by the following.
[0028]
The method for manufacturing a color selection electrode according to claim 4,
Color selection including fixing the color selection electrode element for a color cathode ray tube made of a metal thin plate having a slit or a hole through which an electron beam is formed to a pair of opposed frame members of a frame formed in a substantially rectangular frame shape. A method of manufacturing an electrode, comprising:
(A) Of a plurality of load points set at different positions in the longitudinal direction of the opposed frame member, at least load points other than the load points at both ends of the plurality of load points, the contact members respectively contacting the load points; Displacing each corresponding moving member via a separate elastic member and applying an initial load F0i, thereby applying a force in a direction in which the opposed frame members approach each other;
(B) From the state where the initial load is applied, the moving member is further displaced by a known displacement amount Δymi, and a force applied to a load point other than the both ends is measured. Obtaining a relational expression of a change in the force applied to the load points other than the both ends,
(C) calculating a target value of the amount of displacement of each of the moving members at which a force applied to a load point other than the both ends becomes a desired value Pi from the relational expression; Displacing by a target value;
(D) welding the color selection electrode body to the pair of mutually facing frame members while displacing the moving member in step (c).
Has,
The initial load F0i in the step (a) is:
(T−0.2) × Pi ≦ F0i ≦ (T + 0.2) × Pi (12)
(However, T is a predetermined constant common to all load points)
It is characterized by being within the range satisfying.
The method for manufacturing a color selection electrode according to claim 5 is the method according to claim 4, wherein
In the step (b), after moving each moving member, repeatedly moving another moving member without returning the moving member to its original position, sequentially moving the moving member,
Before each movement of the moving member in the step (b), the load Fij applied to each load point is
(T−0.2) × Pi or more, and
(T + 0.2) × Pi or less
It is characterized by the following.
The method for manufacturing a color selection electrode according to claim 6 is the method according to claim 4, wherein
The initial load F0i in the step (a) is:
(T−0.1) × Pi ≦ F0i ≦ (T + 0.1) × Pi (13)
Is within the range satisfying and
The constant T is
0.8 ≦ T ≦ 1.0 (14)
It is characterized by being within the range satisfying.
The method for producing a color selection electrode according to claim 7 is the method according to claim 6, wherein
In the step (b), after moving each moving member, repeatedly moving another moving member without returning the moving member to its original position, sequentially moving the moving member,
Before each movement of the moving member in the step (b), the load Fij applied to each load point is
(T-0.1) × Pi or more, and
(T + 0.1) × Pi or less
It is characterized by the following.
[0029]
The method for producing a color selection electrode according to claim 8 is the method according to claim 1, 2, or 4,
The initial load in the step (a) includes a state where the load has a desired value Pi, and the relationship between the displacement of the moving member and the force applied to the corresponding load point is within a linear range. Features.
[0030]
According to a ninth aspect of the present invention, there is provided a method of manufacturing a color selection electrode according to the first, second or fourth aspect, wherein (e) a force applied to a load point is predetermined at both ends in a longitudinal direction of the frame member. And moving the moving member until the value becomes
[0031]
The method for manufacturing a color selection electrode according to claim 10 is the method according to claim 1, 2, or 4,
In the step (b), each of the moving members is moved, and the difference between the force applied at each load point before the movement and the force applied at each load point after the movement is determined by the movement of each moving member. Is calculated as a change in force due to
[0032]
An eleventh aspect of the present invention provides a color cathode ray tube including a color selection electrode obtained by the method of any one of the first to tenth aspects.
[0033]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiment 1 FIG.
A first embodiment of the present invention will be described with reference to the drawings. 1 and 2 schematically show deformation of a frame in a manufacturing process of a method for manufacturing a color selection electrode according to the present embodiment.
[0034]
The frame 4 is formed in a substantially rectangular frame shape as described in the related art, and has a pair of mutually opposing frame members 4a which are substantially parallel to each other, for example, and which are perpendicular to the frame member 4a. And a pair of mutually opposing frame members 4b extending in the same direction and connecting the frame members 4a. As described in the related art, by applying a force (compression force) to the pair of frame members 4a of the frame 4, the frame members 4a are brought closer to each other, and in that state, a slit or hole through which an electron beam passes. The color selection electrode element body 3 for a color cathode ray tube, which is formed of a thin metal plate formed with, is welded to the frame 4.
[0035]
When the frame members 4a approach each other, the frame members 4a and 4b are deformed at that time. FIG. 1 shows a deformation process of the frame member 4b when the frame 4 shown in FIG. 17 is pressed or compressed. FIG. 2 is a diagram of the frame 4 viewed from the Z direction in FIG. 1, and schematically shows a deformation process of the frame member 4a by expressing a displacement of an outer shape of the frame member 4a by a dotted line.
[0036]
In the frame member 4a, a plurality of load points Qi (i = 1 to 6) are set at different positions Xi (i = 1 to 6) in the longitudinal direction. The position Xi represents a distance from one end of the frame member 4a to each load point Qi, in other words, a position in the X direction of the load point Qi with respect to one end of the frame member 4a. A force Fi (i = 1 to 6) is applied to each load point Qi.
[0037]
State A is a state of the frame before applying force, state B is a state in which an initial load F0i described later is applied to the frame 4 to displace each load point Qi (initial load application state), and state C is a load point. State D after displacing Qi by a predetermined amount ΔYb, state D is a state where load point Qi is further displaced by ΔYc such that force Fi applied to the load point becomes a desired value (Pi).
[0038]
In this embodiment, the step of shifting from state A to state B, that is, the step of applying an initial load, corresponds to step (a) in the claims, and is also referred to as a first step in the following description. The step of shifting from state B to state C corresponds to step (b) in the claims, and is also referred to as a second step in the following description. The step of shifting from state C to state D corresponds to step (c) in the claims, and is also referred to as a third step in the following description.
[0039]
FIG. 3 is a perspective view showing an outline of a color selection electrode manufacturing apparatus of the present embodiment, and FIG. 4 is a block diagram showing an outline of a control system of the color selection electrode of FIG. As shown in the drawing, this manufacturing apparatus has a plurality of compression units Li (i = 1 to 6). These compression units Li are provided corresponding to the plurality of load points Qi, respectively, and apply a force (compression force) to the opposing frame members 4a at the corresponding load points Qi to deform them in directions approaching each other. is there.
[0040]
In the illustrated example, six load points Qi are provided, and six compression units Li are provided correspondingly. Each compression unit Li has rails 22 and 23 extending in the Y direction (direction in which the frame members 4a approach and separate from each other) and are aligned with each other. Although the rails 22 and 23 are shown as separate bodies, they may be integrated.
[0041]
The movable bases 16, 20, 21 slide on rails 22, 23 independently and freely. On the other hand, the movable bases 17, 18, and 19 are connected to the plate 24 and slide freely on the rail 22 as a unit. The rail 23 and the moving bases 16, 17, 18, 19, 20, 21 constitute a linear guide mechanism. The contact members 25 and 26 are attached to plates 27 and 28 mounted on the moving bases 16 and 21, and the compression unit Li to which the contact members belong is attached to the outer surface 4c of the frame member 4a at the corresponding load point Qi. Abut Thus, the abutting members 25 and 26 of the plurality of compression units Li are arranged as a pair in the Y direction along the longitudinal direction (X direction) of the frame member 4a, and the plurality of load points set on the frame member 4a. At Qi, it contacts the outer side surface 4c of the frame member 4a. The force sensor 29 measures the force applied to the contact member 25 via the plate 27, and is attached to the moving member 30 attached to the plate 24.
[0042]
The motor 31 rotates the ball screw 32. One end of the ball screw 32 is processed into a round shaft, and is held by a bearing 33. The nut 34 engages with the ball screw 32, is attached to a moving member 35 mounted on the moving base 20, converts the rotational movement of the ball screw 32 into a linear movement, and moves the moving member 35 in the Y direction guided by the rail 23. Let it.
[0043]
The moving member 30, the plates 27 and 28 are provided with through holes 37, 38 and 39, and the pole screws 32 pass through these through holes without interference. An elastic member, for example, a compression spring 36 is attached to the moving member 35, and transmits the moving or propulsive force of the moving member 35 to the plate 28. The contact displacement sensor 40 measures the displacement of the moving member 35 in the Y direction (relative displacement with respect to the moving member 30).
[0044]
The motor 31, the bearing 33, and the moving member 30 are integrally moved by the plate 24 in the Y direction. When the motor 31 is driven, the moving member 30 and the moving member 35 approach or separate from each other. Then, by approaching each other, a force (compression force) for causing the frame members 4a to approach each other is generated. The compression force is transmitted to the contact members 25 and 26 via the compression spring 36, and the compression force is transmitted to the frame member 4a by the contact members 25 and 26.
[0045]
As shown in FIG. 4, a signal indicating the force measured by the force sensor 29 and a signal indicating the displacement measured by the displacement sensor 40 are respectively transmitted through the signal lines Wf1 to Wf6 and Wd1 to Wd6 to the control unit CT. And a drive command generated by the control unit CT based on these signals is supplied to the motor 31 via signal lines Wr1 to Wr6.
[0046]
Hereinafter, for the sake of simplicity, FIG. 6 is a schematic diagram illustrating control of a force applied to a load point when the number of load points Qi is 2 with reference to FIG. 5. In FIG. 5, reference numerals 4c and 36 denote the outer surface of the frame member 4a and the compression spring as in FIG. Reference numerals 35-1 and 35-2 denote the moving members 35 in FIG. 3. For distinction, reference numeral 35-1 is provided at the load point Q1 and reference numeral 35-1 is provided at the load point Q2. -2 is attached. However, when there is no need to distinguish as described above, reference numeral 35 is used. Ki is a spring constant of the compression spring 36 at the load point Qi.
[0047]
When the moving member 35-i (i = 1 or 2) is displaced by Δymi (i = 1 or 2) from the position indicated by the dotted line to the position indicated by the solid line, the outer surface 4c of the frame member 4a is displaced from the position indicated by the dotted line to the position indicated by the solid line. Shows that the increment ΔFi (i = 1 or 2) of the force applied to the load point Qi set on the frame member 4a is obtained by the force sensor 29 and the control unit CT. The displacement of the load point Qi when the outer surface 4c of the frame member 4a is displaced from the position of the dotted line to the position of the solid line is ΣΔyij. The subscript i corresponds to the load point at which the displacement occurs, and j corresponds to the load point at which a force that affects the displacement at the load point Qi is applied. The state of the moving members 35-1, 35-2 and the frame member 4a represented by a dotted line is state B, and the state represented by a solid line is state C.
[0048]
Hereinafter, the operation of the same device as that shown in FIGS. 3 and 4 and having two load points Qi and two compression units Li will be described. First, when the frame 4 shown in FIG. 17 is set in the same device as that shown in FIG. 3, the state A shown in FIGS. 1 and 2 is obtained. Next, when the motor 31 of each of the compression units L1 and L2 is driven to rotate the ball screw 32 based on a command supplied from the device control unit CT via the signal lines Wr1 and Wr2, the rotational movement is linearly moved by the nut 34. The moving member 35 having the nut attached thereto is guided by the rail 23 of the linear guide mechanism, and moves toward the motor 31 and thus toward the moving member 30.
[0049]
When the moving member 35 moves, the plate 28 is pushed via the compression spring 36, and the contact member 26 integrated with the plate 28 pushes the frame 4. When the frame 4 is pushed and moves toward the moving member 30, the contact member 25 is pushed, whereby the plate 27 integrated with the contact member 25 moves, and the plate 27 is attached to the moving member 30. And comes into contact with a force sensor 29 interposed between the moving member 30 and the plate 27.
[0050]
When the drive of the motor 31 is further continued, the compression spring 36 is compressed, and the force to be restored acts on the load point Q1 or Q2 set on the frame member 4a via the contact member 26, and the compression spring 36 is compressed. The force to be restored by 36 moves the contact member 25 integrated with the plate 27 via the nut 34, the ball screw 32, the bearing 33, the plate 24, the moving member 30, and the force sensor 29 in the direction of the contact member 26. Let it. As a result, the contact members 25 and 26 attract each other and approach each other, and an action / reaction force is applied to the outer surface 4c of the frame member 4a in a direction in which the frame members 4a approach each other.
[0051]
Therefore, the force measured by the force sensor 29 is a force applied to the contact member 25 as well as a force applied to the contact member 26. The actual deformation of the frame members 4b and 4a starts from the time when both of the contact members 25 and 26 abut on the frame member 4a, the frame member 4b bends downward and the frame member 4a starts approaching each other, The measurement value of the force sensor 29 rises. The measurement value of the force sensor 29 is sent to the device control unit CT via the signal lines Wf1 and Wf2, and is converted into a force Fi applied to the contact member by the device control unit CT. The moving member 35 is moved until the force Fi applied to the load points at all the arbitrary load points Qi of the frame member 4a reaches a predetermined initial load value F0i (defined separately for each load point as described later in detail). Let it. As a result, an arbitrary load point Qi is displaced in the Y direction to be in a state B (that is, an initial load applied state).
[0052]
The contact-type displacement sensor 40 measures the relative displacement of the moving member 35 with respect to the moving member 30. One end is fixed to the moving member 35, and the other end is fixed to the moving member 30 (not shown). ) Is fixed. However, if it is guaranteed that the moving amount of the moving member 35 (with respect to the rail 22) and the moving amount of the moving member 30 (with respect to the rail 23) are substantially equal, the members fixed to the rails 22 and 23 are The other end of the contact type displacement sensor 40 may be fixed.
[0053]
The measurement value of the contact type displacement sensor 40 is also sent to the device control unit CT via the signal lines Wd1 and Wd2, and is converted into the displacement amount of the moving member 35 (relative displacement amount with respect to the moving member 30) by the device control unit CT. You.
[0054]
In FIG. 5, when the moving member 35 is moved by Δym1 and Δym2 from the state B, the compression spring 36 is compressed, and the load points Q1 and Q2 are displaced. Here, if the displacement of the load point Q1 due to the movement of Δym1 is Δy11, the displacement of the load point Q2 is Δy21, the displacement of the load point Q2 due to the movement of Δym2 is Δy21, and the displacement of the load point Q1 is Δy22, the force F1 , F2 from the predetermined values F01, F02, ΔF1, ΔF2 are
ΔF1 = K1 · (Δym1-Δy11) −K1 · Δy12
ΔF2 = −K2 · Δy21 + K2 · (Δym2-Δy22)
It becomes.
[0055]
ΔF1 = ΔF11 + ΔF12
ΔF2 = ΔF21 + ΔF22
After all
ΔF1 = ΔF11 · Δym1 / Δym1 + ΔF12 · Δym2 / Δym2
ΔF2 = ΔF21 · Δym1 / Δym1 + ΔF22 · Δym2 / Δym2
When represented by a matrix, the following equation (1) is obtained.
[0056]
(Equation 5)

[0057]
Equation (1) If the matrix on the left side is ΔF, the matrix on the right side is J, and the matrix on the right side is ΔY,
ΔF = J · ΔY. . . (2)
And J is Jacobian. In the second step, the state is shifted from the state B to the state C, and the Jacobian J is obtained.
[0058]
In equation (1)
ΔF11 / Δym1 = J11,
ΔF12 / Δym2 = J12,
ΔF21 / Δym1 = J21,
ΔF22 / Δym2 = J22
Here, when Δym1 is given as a control input (moving member 35 is moved by Δym1), Fc11 and Fc21 are measured by force sensor 29, and the measured values are incremented, in this case, the measured values and measurement in state B ΔF11 and ΔF21 are calculated from the differences Fc11−F01 and Fc21−F02 from the values F01 and F02. That is,
ΔF11 = Fc11−F01,
ΔF21 = Fc21−F02
Thus, ΔF11 and ΔF21 are calculated. Then, J11 and J21 are calculated from these values.
[0059]
Next, while giving the control input Δym1 and giving Δym2 as the control input (moving the moving member 35 by Δym2), the forces Fc12 and Fc22 are measured by the force sensor 29, and the increments, that is, the control inputs Δym1 and Δym2 are calculated. ΔF12 and ΔF22 are calculated from the differences Fc12−Fc11 and Fc22−Fc21 between the measured values Fc12 and Fc22 given together and the measured values Fc11 and Fc21 given only the control input Δym1. That is,
ΔF12 = Fc12−Fc11,
ΔF22 = Fc22−Fc21
Thus, ΔF12 and ΔF22 are calculated. Then, J12 and J22 are calculated from these values, and Jacobian J is obtained.
[0060]
In the above example, the control input Δym1 is given first, and then the control input Δym2 is given while the control input Δym1 is given. However, the order is reversed, the control input Δym2 is given first, and then the control input Δym2 is given. A similar result can be obtained even when the control input Δym1 is given while the control input Δym2 is given.
[0061]
J ^-1 Is the inverse of J, Equation (2) is
ΔY = J ^-1 .DELTA.F. . . (3)
And can be transformed.
[0062]
Assuming that the desired force applied to each load point Qi is Pi, there is the following relationship between the desired increment ΔPi based on the state C and the force Fci applied to each load point Qi in the state C.
ΔPi = Pi−Fci
The desired increment ΔPi is obtained by the above equation. The desired increments ΔPi for all the load points Qi are represented by a matrix and ΔP, and ΔF in equation (3) is replaced with ΔP, and the inverse matrix J of Jacobian J ^-1 Is calculated, the control displacement amount ΔY of the moving member 35 is calculated. The control displacement amount ΔY indicates the displacement amount to the state D based on the state C, and moves the moving member 35 by ΔY. Thereby, the transition from the state C to the state D is performed.
[0063]
In the third step, the control displacement amount ΔY is calculated, and based on this value, the moving member 35 is moved to make a transition from the state C to the state D.
[0064]
The case where the number of load points Qi is 2 has been described above, but the same applies to the case where the number of load points is n. In this case, equation (1) is extended to the following equations (4) and (5).
[0065]
(Equation 6)

[0066]
Jij = ΔFij / Δymj. . . (5)
[0067]
The Jacobian J is obtained by calculating ΔFij each time the moving members 35 corresponding to the load points Q1, Q2,..., Qn (positions X1, X2,..., Xn) are sequentially moved by a predetermined amount Δym1, Δym2,. , Equation (5), and sequentially calculates Jij.
[0068]
The order in which the moving members 35 corresponding to the load points Q1, Q2,..., Qn are moved is arbitrary. For example, it is not necessary to follow the order from one end of the frame member to the other.
[0069]
When the Jacobian J is found, the inverse matrix J of the Jacobian J is given by the equation (3). ^-1 And the desired force increment ΔP are substituted to calculate the control displacement amount ΔY of the moving member 35, and this value is set as the moving amount (ΔYdc) for transition from the state C to the state D, and the moving member 35 is moved from state C to state D.
[0070]
In this state D (that is, while applying a force to the frame 4), the frame 4 is pushed upward (in the Z direction). Above, the color selection electrode body 3 is pulled in the direction of the arrow (Y direction) to be formed on a flat surface or a surface having a predetermined curvature, and is positioned relative to the frame 4. After the frame member 4a is pressed against the color selection electrode body 3 with a predetermined pressing force, the seam welding electrode 15 is lowered to the press contact portion between the frame 4a and the color selection electrode body 3, and the seam welding electrode 15 is energized. While moving in the X direction, the color selection electrode body 3 and the frame member 4a are seam-welded. This processing corresponds to step (d) in the claims, and is also referred to as a fourth step in the following description. Finally, when the force applied to the frame 4 is released, a restoring force acts to return the frame 4a to the original state before applying the force, and tension is applied to the color selection electrode element body 3.
[0071]
Next, the initial load F0i applied in the step (first step) for leading the state A to the state B will be described. The relationship between the displacement of the moving member 35 provided corresponding to each load point Qi of the frame member 4a and the force applied to each load point Qi is within a predetermined range LR including the state D, as shown in FIG. Is linear, but in other ranges, it is often not linear, or even linear, but not continuous with the range including the state D. As described above, the method of obtaining the desired control displacement amount by obtaining the Jacobian gives the deformation from the state B to the state C in the range of the linear relation including the state D, that is, gives the control input Δymi (i = 1 to n). It is necessary to carry out deformation. Therefore, the condition is that the state B is located within the linear relationship range LR including the state D. The initial load F0i applied for the transformation from the state A to the state B is determined in consideration of the above points.
[0072]
For example, as shown in FIG. 6, if the linear range including the state D starts at about 1/3 or more of the desired force Pi in the state D, the force is 1/3 of the desired force Pi (or a slightly larger force). ) May be added to bring state B.
[0073]
However, setting the initial load as described above may not be able to calculate the control displacement amount with sufficiently high accuracy. This is because if the initial load value F0i (i = 1 to n) in the state B is not in an appropriate range, the load of another load point may fall to zero or near zero when Δymj is given as a control input. Because there is. For simplicity, the case where two load points are set on the outer side surfaces 4c of the pair of opposed frame members 4a used in FIG. 5 will be described. If the initial load values F01 and F02 are not in an appropriate range, the control input is Due to the displacement amount Δy21 of the load point Q2 generated when Δym1 is applied, both the contact members 25 and 26 separate from the frame member 4a, and the load at the load point Q2 falls to zero or near zero. A similar phenomenon can occur when Δym2 is given as a control input. As described above, when the load at the load point falls to zero or near zero, the relational expression between the displacement amount of the moving member and the change amount of the force applied to the load point, that is, the Jacobian J cannot be accurately obtained. The same is true even if the number of load points is expanded to n.
[0074]
Therefore, an initial load value in state B will be considered to prevent the load at each load point from dropping to or near zero when obtaining the Jacobian J.
[0075]
First, the secondary moment of area of the frame member 4a is expressed as I [mm ⁴ ], The length in the X direction of the frame member 4a (the distance between the portions fixed to the pair of frame members 4b) is L [mm], and one end of the frame member 4a (fixed to one of the pair of frame members 4b). Xi [mm] is the distance in the X direction from the load to the load point Qi, and the Young's modulus of the frame member 4a is E [kgf / mm ² ], And the elastic coefficient of the elastic member 36 at the load point Qi is Ki [kgf / mm]. The elastic coefficient of the frame member 4a at the load point Qi (elastic coefficient for deformation in the direction in which the frame members 4a approach each other) Ri [kgf / mm] can be obtained by the following equation (6).
[0076]
Ri = 3E · I · L / ｛Xi ² ・ (L-Xi) ² ｝. . . (6)
[0077]
Further, when Δymj is given as a control input at a certain load point Qj, the frame displacement amount Δyjj at the load point Qj is obtained by the following equation (7).
[0078]
Δyjj = Δymj · Ki / (Rj + Kj). . . (7)
[0079]
At this time, it is clear that the frame displacement Δyij at the load point Qi other than the load point Qj is smaller than the frame displacement Δyjj at the load point Qj.
[0080]
In order to prevent the load at each load point from dropping to or near zero when determining the Jacobian J, the amount of deflection Di of the elastic member 36 at the load point Qi in the initial load applied state is calculated from the frame displacement amount Δyij. It should be big. In the second step of obtaining the Jacobian J, the load points Qj (j = 1, 2,..., N) are sequentially displaced by a predetermined amount Δymj.
[0081]
(Equation 7)

[0082]
It is good to do as. Here, the right side represents the accumulated value of the displacement of the frame member at each load point (Qi) while the moving member is sequentially moved at all the load points (Qj (j = 1 to n)). In the present embodiment, the force at each load point is measured, and the force is equal to the value obtained by multiplying the amount of deflection of the elastic member by the elastic coefficient. Therefore, when both sides of the equation (8) are multiplied by the elastic coefficient Ki of the elastic member,
Di × Ki ≧ Ki × {[{Kj / (Rj + Kj)} × Δymj]. . . (9)
The left side of the above equation (9) is equal to the force F0i applied to the elastic member and the frame member 4a at the load point Qi. The right side is defined as an initial load index Si. That is,
[0083]
(Equation 8)

[0084]
By making the initial load F0i larger than the initial load index Si, the load at each load point does not drop to zero or near zero in the second step (the step of obtaining the Jacobian J).
[0085]
As described above, at each load point, by setting the initial load F0i to be larger than the initial load index Si, the Jacobian J can be accurately obtained without the loads at all the load points falling to zero or near zero. As a result, it is possible to calculate the amount of control displacement for setting the force Fi applied to an arbitrary load point Qi to a desired force Pi with high accuracy.
[0086]
In the present embodiment, although the displacement amount is larger in the state D than in the state C, the above calculation method itself can be applied to a case where the displacement amount is smaller in the state D than in the state C. However, in this case, the condition is that the state C having a larger deformation amount than the state D (shown as “state C ′” in FIG. 6) is within the range of the linear relationship including the state D. However, generally, in order to reduce the weight, the frame is designed to be in the vicinity of the limit of the plastic deformation in the state D. When the frame exceeds the state D, the frame exceeds the upper limit of the range of the linear relationship including the state D. Often.
[0087]
Embodiment 2 FIG.
In the first embodiment, one moving member is moved so that the control input Δym1 is given first, and then the control input Δym1 is given while the control input Δym1 is given. Position), the movement of another moving member is repeated, but instead of doing so, the moving member at one load point, for example, the load point Q1, is displaced to move the frame at the load point Q1. After measuring the displacement of the member and the force F1 applied thereto, the moving member at the load point Q1 is returned to the original position, and then the moving member at another load point, for example, the moving member at the load point Q2 is displaced. The Jacobian J can be obtained while sequentially displacing the moving members and returning the moving members. In this case, the initial load index Si is obtained as in the following equation (11) from the same concept as described above.
[0088]
(Equation 9)

[0089]
Here, the right side is the maximum value of the displacement of the frame member at each load point (Qi) due to individually moving the moving members at the load points (Qj (j = 1 to n)) in the second step. Represents Then, the initial load F0i is set to a value equal to or greater than the initial load index Si obtained by Expression (11). With this configuration, it is possible to make the flexure amount Di of the elastic member in the initial load applied state larger than the maximum displacement amount of the frame member due to the movement of each moving member in the second step. it can.
[0090]
Also in this case, at each load point, the initial load F0i is set to be larger than the initial load index Si defined by the equation (11), so that the load at all the load points does not fall to zero or near zero, and the Jacobian is accurately measured. J can be obtained.
[0091]
As described above, after displacing the moving member at one load point, measuring the displacement of the frame member at the load point and the force applied thereto, the moving member at the load point is returned to its original state, and then When the Jacobian J is obtained while sequentially displacing the moving member at each load point and returning it to the original state, such as displacing the moving member at another load point, the above-mentioned “state B” and “state C” Be equal.
[0092]
According to the above-described first and second embodiments, even when the stiffness of the frame greatly varies, all the load points can be set by giving Si as an index to the initial load and giving a sufficiently large value as the initial load as the initial load. The Jacobian J can be accurately obtained without the load of zero falling to or near zero.
[0093]
When shifting from the state A to the state B, it is possible to preset the position in the Y direction of the moving member in which the force F0i applied at all the load points Qi of the frame member 4 exceeds a predetermined value (initial load index) Si. When possible, the moving member may be moved to this set position without controlling the movement of the moving member by the applied force F0i. In this way, the transition time from state A to state B can be reduced. For example, when the width of the frame 4, that is, the dimension in the Y direction (the distance between the outer surfaces 4c of the two frame members 4a) varies within an allowable error range, when the moving member is moved to a predetermined set position, the frame width is changed. Is smaller, the force applied to the frame is smaller. Therefore, even in a frame in which the width of the frame is the minimum value within the allowable error range, the force F0i applied at all the load points Qi is equal to the predetermined value Si as described above. If the position of the moving member exceeding the Y direction can be set in advance, the moving member may be moved to the above set position. However, if the width of the frame 4 is the maximum value within the allowable error range, and if the moving member is moved to the above-described set position to the above-mentioned predetermined set position, plastic strain is applied to the frame. Such control (control of moving the moving member to the predetermined position to the set position) cannot be applied.
[0094]
Further, although the contact type displacement sensor is used as the means for measuring the displacement of the moving member 35, the same operation and effect can be obtained by using a non-contact displacement sensor such as a laser displacement meter.
[0095]
Further, even when a servo motor having a built-in encoder is used instead of the motor 31 and the amount of motor rotation from the encoder is converted into the amount of displacement of the moving member 35 to obtain the amount of displacement of the moving member 35, the same operation and effect can be obtained. Is obtained.
[0096]
Furthermore, when the frame shown in FIG. 18 is used, the amount of the force applied to the load points other than both ends in the longitudinal direction of the frame member 4a contributing to the bending of the frame member 4b is extremely small and can be treated as an error. Therefore, prior to the above-described first step, a step (fifth step) of applying a desired force to the load points Qi at both ends is performed. The first, second, and third steps are performed. That is, in the step of applying a force to the load points at the first both ends (the force may be applied to both ends at the same time, or one may be applied first, but it is preferable to perform the force simultaneously from the viewpoint of productivity) The moving member is moved until the force measured by the sensor 29 reaches a desired value. (At this time, when a compressive force is applied at the load points at both ends, the Jacobian J may be obtained and the compressive force may be applied.)
[0097]
Next, Jacobian J is determined when a force is applied to a load point other than both ends. Then, the force applied to each load point (the load points Qi other than both ends) is controlled to a desired value by using the Jacobian J thus obtained.
[0098]
Even when the process is divided in this way, by setting the initial load F0i to be larger than the initial load index Si at the load points other than the both ends, the loads at all the load points can be accurately measured without falling to zero or near zero. Jacobian J can be obtained.
[0099]
Embodiment 3 FIG.
Next, a third embodiment of the present invention will be described. The outline of the configuration and operation of the device for performing the method of the present embodiment is the same as that of the first embodiment. The differences are as follows. That is, the initial load F0i (i = 1 to n) is applied in the state B (that is, the initial load application state), and the moving member at the load point Qi is sequentially displaced in the process of shifting to the state C, and the Jacobian J is returned while returning to the original state. And the inverse matrix J of Jacobian J ^-1 And the desired displacement Pi (i = 1 to n) to calculate the control displacement amount Yi (i = 1 to n) of the moving member 35, and move the moving member 35 based on this value to make a transition from the state C to the state D. In a series of steps such as the following, the initial load F0i (i = 1 to n) is given (that is, a certain initial load F0i is given, and then the moving member is displaced by a predetermined amount of displacement, and the relationship between the displacement and the load is given). Is obtained, and a control displacement amount that generates a desired load is obtained based on the obtained value, and the load Fdi (i = 1 to n) in the state D is measured by moving the moving member based on the control displacement amount. Then, the load control accuracy, that is, the difference between the load Fdi (i = 1 to n) and the desired force Pi (i = 1 to n) was evaluated. Some of the results are shown in Table 1 of FIG. In this measurement, the load points were set to six points, and the amount of movement of the moving member 35 when shifting from the state B to the state C was made constant in order to make the measurement conditions uniform.
[0100]
The specification of the load in the state D is within a range of ± 20% centering on the value of the desired force, and from Table 1 in FIG. If the range is 40% or less, it is understood that this standard is satisfied. That is, the initial load is calculated using a constant T common to all load points,
(T−0.2) × Pi ≦ F0i ≦ (T + 0.2) × Pi. . . (12)
If this range is set, this standard can be satisfied.
[0101]
Also, the following equation
(T−0.1) × Pi ≦ F0i ≦ (T + 0.1) × Pi. . . (13)
0.8 ≦ T ≦ 1.0. . . (14)
By setting as described above, it is possible to cope with a strict standard such as a range of ± 10% around a desired force value.
[0102]
Hereinafter, this result will be described. FIG. 8 and FIG. 9 are schematic diagrams for explaining the change of the force applied to the load points by setting two load points on the outer side surfaces of the pair of opposed frame members to simplify the description. 8 and 9, reference numerals 4c and 36 denote the outer surface of the frame member 4a and the compression spring as in FIG. Reference numerals 35-1 and 35-2 denote the moving members 35 in FIG. 3. For distinction, reference numeral 35-1 is provided at the load point Q1 and reference numeral 35-1 is provided at the load point Q2. -2 is attached. However, when there is no need to distinguish as described above, reference numeral 35 is used. Ki is a spring constant of the compression spring 36 at the load point Qi.
[0103]
The position of the dotted line indicates the state B, that is, the initial load application state. FIG. 8 shows a case where the initial loads F01 and F02 have substantially the same value, and FIG. 9 shows a case where the initial loads F01 and F02 have different values. The position of the solid line is the position of the outer surface of the frame member when the moving member of the load point Q1 is displaced by Δym1 in order to obtain the Jacobian, and the position outside the frame member 4a at the load points Q1 and Q2 at that time. Assuming that the amount of displacement of the side surface 4c from the initial load application state is Δy11, Δy21, and the amount of change in the load is ΔF11, ΔF21, the following equation is established.
[0104]
J11 = ΔF11 / Δym1, ΔF11 = K1 · (Δym1-Δy11)
J21 = ΔF21 / Δym1, ΔF21 = −K2 · Δy21
[0105]
Here, the displacement amounts of the load points Q1 and Q2 in FIG. 8 are clearly different from the displacement amounts of the load points Q1 and Q2 in FIG. Since the displacement amount of the moving member is constant at Δym1 in both FIGS. 8 and 9, the components J11 and J21 of the Jacobian obtained from the initial load applied state in FIG. 8 and the configuration of the Jacobian obtained from the initial load applied state in FIG. Elements J11 and J21 have different values. Although not shown, the same can be said for the components J12 and J22 of the Jacobian obtained when the moving member at the load point Q2 is displaced by Δym2.
[0106]
Although the number of load points has been described as two for simplicity, the same can be said for the case where the number of load points is expanded to n.
[0107]
From these results, it is understood that when the relative ratio of the load at each load point (which may be considered as the relative ratio of the amount of frame deflection at each load point) is different, the Jacobian obtained from the state is also different. It is also clear that even if the absolute values of the loads at the respective load points are different, substantially the same Jacobian can be obtained if the relative ratios of the loads are equal. Since the Jacobian is for obtaining a control input for shifting from state C (or state B) to state D, the relative ratio of the initial load at each load point and the relative ratio of the desired force at each load point are equal. In this case, it is considered that the load control accuracy is improved.
[0108]
The result in Table 1 in FIG. 7 proves this fact. Equation (12) or (13) is equivalent to the relative ratio of the initial load required to satisfy the load specification in the state D. Is a mathematical expression.
[0109]
As described above, the initial load F0i is calculated using the constant T common to all the load points with respect to the desired force Pi applied to the load point Qi.
(T−0.2) × Pi ≦ F0i ≦ (T + 0.2) × Pi (12)
, The load can be controlled with high accuracy for a desired force.
[0110]
Further, the initial load F0i is obtained by using a constant T common to all the load points with respect to the desired force Pi applied to the load point Qi.
(T−0.1) × Pi ≦ F0i ≦ (T + 0.1) × Pi (13)
And a constant T common to all the load points
0.8 ≦ T ≦ 1.0 (14)
By setting to, the load can be controlled with higher accuracy for a desired force.
[0111]
Embodiment 4 FIG.
In this embodiment, similarly to Embodiment 1, in the second step, that is, in step (b), after moving each moving member, another moving member is moved without returning the moving member to its original position. The present invention relates to a case in which the moving member is repeatedly moved to sequentially move the moving members.
In Embodiment 3 described above, the initial load F0i is set to satisfy Expression (12), Expression (13), and Expression (14). That is, the initial load F0i is
(T−0.2) × Pi or more, and
(T + 0.2) × Pi or less,
Or,
(T-0.1) × Pi or more, and
(T + 0.1) × Pi or less (provided that 0.8 ≦ T ≦ 1.0)
I decided.
In the second step, that is, in step (b), after each moving member is moved, another moving member is moved without returning the moving member to its original position, and the moving members are sequentially moved. In this case, not only the initial load satisfies the above conditions, but also the load Fij applied to each load point before the movement of each moving member in step (b) satisfies the same conditions as above. It is desirable.
That is, before the movement of each moving member in step (b), the load Fij applied to each load point is:
(T−0.2) × Pi or more, and
(T + 0.2) × Pi.
further,
(T-0.1) × Pi or more, and
(T + 0.1) × Pi or less (provided that 0.8 ≦ T ≦ 1.0)
It is more desirable to determine.
By determining as described above, in step (b), after moving each moving member, repeatedly moving another moving member without returning the moving member to its original position, and sequentially moving the moving member Even in the case of moving, the load can be controlled with higher accuracy for a desired force.
[0112]
The same modifications as described in the first and second embodiments are also applicable to the third and fourth embodiments.
[0113]
【The invention's effect】
According to the manufacturing method of the first aspect, in the step (b), the Jacobian J can be accurately obtained without the loads at all the load points falling to zero or near zero. As a result, a force Fi applied to an arbitrary load point Qi can be set to a desired value Pi with high accuracy, and a tension distribution can be applied to the color selection electrode element body with high accuracy.
In the step (b), after each moving member is moved, another moving member is repeatedly moved without returning the moving member to the original position, and the plurality of moving members are sequentially moved. , The time required for step (b) can be shortened.
[0114]
According to the manufacturing method of the second aspect, even when the Jacobian J is determined while sequentially displacing and returning the load point Qi, the initial load F0i at each load point is determined by the initial load index Si defined by the equation (11). By setting a larger value, the Jacobian J can be accurately obtained without the loads at all the load points dropping to or near zero. As a result, the force Fi applied to an arbitrary load point Qi can be set to a desired value with high accuracy, and the tension distribution can be applied to the color selection electrode element body with high accuracy.
Also, after moving each moving member, the moving member is returned to the original position, and then another moving member is repeatedly moved, so that the moving members are sequentially moved. The displacement amount of each moving member can be made relatively large, the amount of change in force at each load point when each moving member is displaced can be made relatively large, and measurement can be performed reliably and accurately. it can.
[0115]
According to the manufacturing method of the third aspect, the elastic coefficient can be obtained by relatively simple calculation.
[0116]
According to the manufacturing method of the fourth aspect, the load Fi applied to the load point Qi can be controlled to a value sufficiently close to the desired force Pi, that is, with high accuracy, and as a result, the tension distribution is applied to the color selection electrode element body. It can be applied with high precision.
[0117]
According to the manufacturing method of the fifth aspect, in the step (b), after moving each moving member, repeatedly moving another moving member without returning the moving member to its original position, Are sequentially moved, the load Fi applied to the load point Qi can be controlled to a value sufficiently close to the desired force Pi, that is, with high accuracy, and as a result, the tension distribution can be precisely adjusted to the color selection electrode element body. Can be granted.
[0118]
According to the manufacturing method of the sixth aspect, for the desired force Pi applied to the load point Qi, the initial load F0i is set in a range of 0.8 × Pi to Pi using a constant T common to all the load points. By setting them within the above, the force applied to each load point can be controlled to a value closer to the desired force Pi, that is, more precisely, and the tension distribution can be more precisely applied to the color selection electrode element body. can do.
[0119]
According to the manufacturing method of the seventh aspect, in the step (b), after moving each moving member, repeatedly moving another moving member without returning the moving member to its original position, Are sequentially moved, the load Fi applied to the load point Qi can be controlled to a value closer to the desired force Pi, that is, with higher accuracy, and as a result, the tension distribution can be more precisely adjusted to the color selection electrode element body. Can be provided.
[0120]
According to the manufacturing method of the eighth aspect, the relationship between the displacement of the moving member and the force applied to the frame member is continuous over the entire range from the state where no force is applied to the state where the force applied to the frame member becomes a desired value. However, even if not, as long as there is a range of a linear relationship including a state in which the force applied to the frame member has a desired value, the processing in step (b) can be performed accurately, and therefore, the movement that generates the desired force The displacement of the member can be determined accurately.
[0121]
According to the manufacturing method of the ninth aspect, the control time of the force applied to the frame member can be reduced. In addition, the process of applying an average tension to the color selection electrode element and the step of providing a distribution of tension are separated, and a quality abnormality relating to the tension of the color selection electrode element occurs at the manufacturing site of the color selection electrode. In this case, an effect is obtained that makes it easier to pursue the cause and take countermeasures.
[0122]
According to the manufacturing method of the tenth aspect, since the increment of the force can be obtained by measuring the force and calculating the difference between the forces, the measurement can be performed by a widely used force sensor.
[0123]
Further, by providing the color selection electrodes obtained by the manufacturing methods of claims 1 to 10, it is possible to provide a high quality color cathode ray tube in which image disturbance is less likely to occur.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a deformation process of a frame as viewed in a direction parallel to a vertical direction of a display screen.
FIG. 2 is a diagram illustrating a process of deforming a frame as viewed in a direction perpendicular to a display screen.
FIG. 3 is a perspective view showing a mechanism of the apparatus for manufacturing a color selection electrode according to the first embodiment of the present invention.
FIG. 4 is a block diagram illustrating a control system of the color selection electrode manufacturing apparatus according to the first embodiment.
FIG. 5 is a diagram illustrating control of a force applied to two load points.
FIG. 6 is a graph showing an example of a relationship between a displacement of a moving member and a force applied to a frame member.
FIG. 7 is a table showing a measurement result of a load when the moving member is displaced to a position obtained by calculation.
FIG. 8 is a diagram illustrating control of force at two load points and an initial load.
FIG. 9 is a diagram illustrating control of force at two load points and an initial load.
FIG. 10 is a diagram showing a configuration of a color cathode ray tube.
FIG. 11 is a diagram showing a configuration of a color selection electrode.
FIG. 12 is a diagram illustrating an example of a color selection electrode body.
FIG. 13 is a diagram showing another example of the color selection electrode body.
FIG. 14 is a diagram showing a state where an electron beam is projected on a phosphor.
FIG. 15 is a graph showing the distribution of tension applied to a color selection electrode body.
FIG. 16 is a diagram illustrating an example of a frame.
FIG. 17 is a diagram showing another example of a frame.
FIG. 18 is a diagram showing still another example of a frame.
FIG. 19 is a perspective view showing an example of a conventional apparatus for manufacturing a color selection electrode.
FIG. 20 is a view showing the operation of a conventional manufacturing apparatus.
[Explanation of symbols]
1 color cathode ray tube, 2 color selection electrode, 3 color selection electrode body, 3a slit, 3b hole, 4 frame, 4a frame member, 4b frame member, 5 panel, 6 phosphor, 7 electron gun, 8 electron beam, 9 Funnel, 10 deflection yoke, 11 pressurizer, 12 pressure sensor, 13 hydraulic cylinder, 14 rotating shaft, 15 seam welding electrode, 16 moving base, 17 moving base, 18 moving base, 19 moving base, 20 moving base, 21 moving base , 22 rails, 23 rails, 24 plates, 25 contact members, 26 contact members, 27 plates, 28 plates, 29 force sensors, 30 moving members, 31 motors, 32 ball screws, 33 bearings, 34 nuts, 35 moving members, 36 compression spring, 37 through hole, 38 through hole, 39 through hole, 40 contact type displacement sensor.

Claims (11)

Color selection including fixing the color selection electrode element for a color cathode ray tube made of a metal thin plate having a slit or a hole through which an electron beam is formed to a pair of opposed frame members of a frame formed in a substantially rectangular frame shape. A method of manufacturing an electrode, comprising:
(A) Of a plurality of load points set at different positions in the longitudinal direction of the opposed frame member, at least load points other than the load points at both ends of the plurality of load points, the contact members respectively contacting the load points; Displacing each corresponding moving member via a separate elastic member and applying an initial load F0i, thereby applying a force in a direction in which the opposed frame members approach each other;
(B) From the state where the initial load is applied, the moving member is further displaced by a known displacement amount Δymi, and a force applied to a load point other than the both ends is measured. Obtaining a relational expression of a change in the force applied to the load points other than the both ends,
(C) calculating a target value of the amount of displacement of each of the moving members at which a force applied to a load point other than the both ends becomes a desired value Pi from the relational expression; Displacing by a target value;
(D) welding the color selection electrode body to the pair of opposed frame members while displacing the moving member in step (c);
In the step (b), after moving each moving member, repeatedly moving another moving member without returning the moving member to its original position, sequentially moving the moving member,
The initial load F0i at each load point Qi in the step (a) is

(here,
Ki is the elastic modulus of the elastic member at the load point Qi,
Kj is the elastic coefficient of the elastic member at the load point Qj (j is the number of the load point, j = 1 to n),
Δymj is the displacement of the moving member at each load point Qj in step (b),
Rj is an elastic coefficient of deformation of the pair of frame members at the load point Qj in the directions approaching each other.)
A method for producing a color selection electrode, wherein the initial load index is given by: Color selection including fixing the color selection electrode element for a color cathode ray tube made of a metal thin plate having a slit or a hole through which an electron beam is formed to a pair of opposed frame members of a frame formed in a substantially rectangular frame shape. A method of manufacturing an electrode, comprising:
(A) Of a plurality of load points set at different positions in the longitudinal direction of the opposed frame member, at least load points other than the load points at both ends of the plurality of load points, the contact members respectively contacting the load points; Displacing each corresponding moving member via a separate elastic member and applying an initial load F0i, thereby applying a force in a direction in which the opposed frame members approach each other;
(B) From the state where the initial load is applied, the moving member is further displaced by a known displacement amount Δymi, and a force applied to a load point other than the both ends is measured. Obtaining a relational expression of a change in the force applied to the load points other than the both ends,
(C) calculating a target value of the amount of displacement of each of the moving members at which a force applied to a load point other than the both ends becomes a desired value Pi from the relational expression; Displacing by a target value;
(D) welding the color selection electrode body to the pair of opposed frame members while displacing the moving member in step (c);
In the step (b), after each moving member is moved, the moving member is returned to the original position, and then another moving member is repeatedly moved.
The initial load F0i in the step (a) is

(here,
Ki is the elastic modulus of the elastic member at the load point Qi,
Kj is the elastic coefficient of the elastic member at the load point Qj (j is the number of the load point, j = 1 to n),
Δymj is the displacement of the moving member at the load point Qj in the step (b),
Rj is an elastic coefficient of deformation of the pair of frame members at the load point Qj in the directions approaching each other.)
A method for producing a color selection electrode, wherein the initial load index is given by: The elastic coefficient Rj of the frame member is defined as Ri = 3E · I · L / {Xi ² · (L−Xi) ² }. . . (6)
(here,
E is the Young's modulus of the frame member,
I is the second moment of area of the frame member,
Xi is a distance from one end of the frame member to the load point Qi,
L is the length of the frame member)
The method according to claim 1, wherein the color selection electrode is obtained by the following. Color selection including fixing the color selection electrode element for a color cathode ray tube made of a metal thin plate having a slit or a hole through which an electron beam is formed to a pair of opposed frame members of a frame formed in a substantially rectangular frame shape. A method of manufacturing an electrode, comprising:
(A) Of a plurality of load points set at different positions in the longitudinal direction of the opposed frame member, at least load points other than the load points at both ends of the plurality of load points, the contact members respectively contacting the load points; Displacing each corresponding moving member via a separate elastic member and applying an initial load F0i, thereby applying a force in a direction in which the opposed frame members approach each other;
(B) From the state where the initial load is applied, the moving member is further displaced by a known displacement amount Δymi, and a force applied to a load point other than the both ends is measured. Obtaining a relational expression of a change in the force applied to the load points other than the both ends,
(C) calculating a target value of the amount of displacement of each of the moving members at which a force applied to a load point other than the both ends becomes a desired value Pi from the relational expression; Displacing by a target value;
(D) welding the color selection electrode body to the pair of opposed frame members while displacing the moving member in step (c);
The initial load F0i in the step (a) is:
(T−0.2) × Pi ≦ F0i ≦ (T + 0.2) × Pi (12)
(However, T is a predetermined constant common to all load points)
A method for producing a color selection electrode, wherein the color selection electrode falls within a range satisfying the following. In the step (b), after moving each moving member, repeatedly moving another moving member without returning the moving member to its original position, sequentially moving the moving member,
Before each movement of the moving member in the step (b), the load Fij applied to each load point is equal to or more than (T−0.2) × Pi and equal to or less than (T + 0.2) × Pi. The method for producing a color selection electrode according to claim 4, characterized in that: The initial load F0i in the step (a) is:
(T−0.1) × Pi ≦ F0i ≦ (T + 0.1) × Pi (13)
And the constant T is
0.8 ≦ T ≦ 1.0 (14)
The method for producing a color selection electrode according to claim 4, wherein the range is satisfied. In the step (b), after moving each moving member, repeatedly moving another moving member without returning the moving member to its original position, sequentially moving the moving member,
Before each movement of the moving member in the step (b), the load Fij applied to each load point is not less than (T−0.1) × Pi and not more than (T + 0.1) × Pi. The method for producing a color selection electrode according to claim 6, wherein The initial load in the step (a) includes a state in which the load has a desired value Pi, and the relationship between the displacement of the moving member and the force applied to the corresponding load point is within a linear range. The method for producing a color selection electrode according to claim 1, 2 or 4, wherein 3. The method according to claim 1, further comprising the step of: (e) moving the moving member until a force applied to a load point at a longitudinal end portion of the frame member reaches a predetermined value. 5. The method for producing a color selection electrode according to item 4. In the step (b),
Each of the moving members is moved, and the difference between the force applied at each load point before the movement and the force applied at each load point after the movement is calculated as a change in the force due to the movement of each moving member. The method for producing a color selection electrode according to claim 1, 2 or 4, wherein A color cathode ray tube comprising a color selection electrode obtained by the production method according to claim 1.

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