JP2004079384A - Color selection mechanism and color cathode-ray tube - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lightweight and high-reliability color selection mechanism having high mechanical strength, and easy to machine without generating a cause of failure; and to provide a color cathode-ray tube equipped with the color selection mechanism. <P>SOLUTION: This color selection mechanism 5<SB>1</SB>is so structured that a color selecting electrode thin plate 26 is stretched on a frame 27 comprising a pair of support members 11 and 12 and a pair of elasticity imparting members 13 and 14; the mechanism comprises cross-sectionally U-shaped members 17 of the elasticity imparting members and closing plates 18 for closing the openings thereof; the center parts with the closing plates 18 mounted are formed as hollow members; the other parts are formed with the cross-sectionally U-shaped members; each closing plate 18 is formed of a material having a coefficient of thermal expansion larger than that of the cross-sectionally U-shaped member; and the ratio L<SB>2</SB>/L<SB>1</SB>of the length L<SB>2</SB>of the closing plate 18 to the length L<SB>1</SB>of the cross-sectionally U-shaped member is set to 0.5-0.8. This color cathode-ray tube is composed by being provided with the color selection mechanism 5<SB>1</SB>. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、色識別機構及びこの色選別機構を備えてなるカラー陰極線管に係わる。
【０００２】
【従来の技術】
カラー陰極線管用の色識別機構として、例えば図６及び図７に示すようなアパーチャグリルと称される色選別機構４０が知られている。（特開２００２−８５５５号公報参照）。
この色選別機構４０は図６に示すように、１対の相対向する支持部材４１，４２と、この支持部材４１，４２の両端間に差し渡されるようにして溶接された１対の弾性賦与部材４３，４４とからなる枠状のフレーム５７が設けられ、このフレーム５７の相対向する支持部材４１，４２上間に、即ち画面水平方向（Ｘ方向）に沿って配列された多数のスリット状のビーム透過孔５５を有するマスク部材、即ち、色選別用電極薄板５６が架張されてなる。
【０００３】
弾性賦与部材４３，４４は、図７Ａ〜Ｂに示すように、全体として十分なスプリング弾性を有するように両端部が曲率をもって屈曲した弓形構造をなし、且つ全長にわたり断面コ字形部材４７とこの断面コ字形部材４７の開口を閉塞する閉塞板４８が溶接された中空構造に形成される。この弾性賦与部材４３，４４は、閉塞板４８が断面コ字形部材４７よりも熱膨張係数の大きい部材で形成され、断面コ字形部材４７と閉塞板４８とによってバイメタル構造となっている。この閉塞板４８は、いわゆる温度補償部材を兼ねている。一方、弾性賦与部材４３，４４は、陰極線管の製造プロセスにおける色選別用電極薄板５６の塑性変形伸び及び陰極線管の作動時における電子ビーム照射による色選別用電極薄板５６の一時的伸びを吸収する役割を有している。
【０００４】
色選別用電極薄板５６は、例えばステンレス材による金属薄板からなり、多数の細い帯状のグリット素体５４を上記一方向に所定の間隔をもって配列し、各隣合うグリット素体５４間に画面垂直方向（Ｙ方向）に長いスリット状のビーム透過孔５５を形成して構成される。
【０００５】
上述の色選別機構４０では、フレーム５７を構成する弾性賦与部材４３，４４が中空構造であるため軽量且つ機械的強度が維持できる。同時に、弾性賦与部材４３，４４自体がバイメタル構造であるので、陰極線管の動作時の温度ドリフトによるミスランディングの補正に寄与し、全体として色選別機構４０の軽量化を可能にする。
【０００６】
【発明が解決しようとする課題】
ところで、上述の色選別機構４０では、弾性賦与部材４３，４４が全長にわたって閉塞板４８を取り付けた中空構造をなし、末端を開口した構成となっているが、全体が弓形形状であるため中空内に入った塵は取りにくく、最悪の場合にその塵により陰極線管内に放出されたとき放電が生じ、例えばテレビ回路を故障させる等、カラー陰極線管の故障の原因にもなる虞がある。また、弓形形状の弾性賦与部材４３，４４の全長に閉塞板４８を取り付けるため、閉塞板４８の弓状の曲げ加工でコスト高となり加工精度も出し難い。さらに、弾性賦与部材、従って断面コ字形部材４７の全長に閉塞板４８をティグ（Ｔｉｇ）溶接等で取り付けるが、閉塞板４８が長いため溶接点Ｐの数も多くなる。例えば、弾性賦与部材１本当たり溶接は、図７Ａ，Ｂに示すように、両端部で（２×２＝４）、屈曲部で（２×２＝４）、中央部で（１×２＝２）の計１０点が必要になり、溶接コストが高くなる。なお、ティグ溶接とは、アルゴンのような不活性ガスの中でタングステン電極と母材間でアークを発生させて溶接する方法である。
【０００７】
本発明は、上述の点に鑑み、軽量且つ機械的強度が大きく、さらに加工しやすく、故障の原因を作らない信頼性の高い色選別機構、及びこの色選別機構を備えた信頼性の高いカラー陰極線管を提供するものである。
【０００８】
【課題を解決するための手段】
本発明に係る色選別機構は、１対の支持部材と１対の弾性賦与部材とからなるフレーム上に色選別用電極薄板が架張されて、弾性賦与部材が断面コ字形部材とその開口を閉塞する閉塞板とからなり、閉塞板を取り付けた中央部分が中空部材として構成され、他の部分が断面コ字形部材で構成され、閉塞板が断面コ字形部材より熱膨張係数の大きい材料で形成され、断面コ字形部材の長さＬ_１に対する閉塞板の長さＬ_２の比率Ｌ_２／Ｌ_１が０．５〜０．８に設定された構成とする。
本発明は、上記色選別機構において、弾性賦与部材を弓形に形成し、弓形の中央の直線部分に閉塞板を取り付け、弓形の両端を１対の支持部材に接合した構成とするのが好ましい。
【０００９】
本発明の色選別機構では、そのフレームを構成する弾性賦与部材が断面コ字形部材とその開口を閉塞する閉塞板からなり、弾性賦与部材の中央部分を中空部材とし、他の部分を断面コ字形部材とすることにより、色選別機構の軽量化及び機械的強度の向上が図られると共に、他の部分が断面コ字形部材で開放状態になるので、塵等の検査がし易く、塵が入っても取り出し易い。閉塞板が断面コ字形部材より熱膨張係数の大きい材料で形成され、断面コ字形部材の長さＬ_１に対する閉塞板の長さＬ_２の比率Ｌ_２／Ｌ_１を０．５〜０．８に設定することにより、弾性賦与部材のバイメタル機能が十分果たされる。
弾性賦与部材の断面コ字形部材が弓形に形成され、弓形の中央の直線部分に閉塞板を取り付けるときは、弾性賦与部材の弾性をより有せしめることができ、且つ閉塞板の曲げ加工が不要になり、且つ溶接点が削減され、製造の容易化、コスト低減が図れる。
【００１０】
本発明に係るカラー陰極線管は、１対の支持部材と１対の弾性賦与部材とからなるフレーム上に色選別用電極薄板が架張され、弾性賦与部材が断面コ字形部材とその開口を閉塞する閉塞板とからなり、閉塞板が取り付けられる中央部分が中空部材として構成され、他の部分が断面コ字形部材で構成され、閉塞板が断面コ字形部材より熱膨張係数の大きい材料で形成され、断面コ字形部材の長さＬ_１に対する閉塞板の長さＬ_２の比率Ｌ_２／Ｌ_１が０．５〜０．８に設定されてなる色選別機構を備えた構成とする。
本発明は、上記カラー陰極線管において、その色識別機構に弾性賦与部材を弓形に形成し、弓形の中央の直線部分に閉塞板を取り付け、弓形の両端を１対の支持部材に接合した構成とするのが好ましい。
【００１１】
本発明のカラー陰極線管では、上記色選別機構を備えるので、軽量化が図られると共に、フレームの弾性賦与部材自体のバイメタル構造により温度ドリフトによるミスランディングの補正が適正に行える。色選別機構からの塵の発生もなく、管体内における放電等の不都合が生じない。色選別機構の製造の容易化により、カラー陰極線管の製造のコスト低減が図れる。
【００１２】
【発明の実施の形態】
【００１３】
以下、図面を参照して本発明の実施の形態を説明する。
【００１４】
図１は、本発明に係るカラー陰極線管の一実施の形態を示す。
本実施の形態に係るカラー陰極線管１は、陰極線管体２のパネル部３の内面に例えばストライプ状の赤、緑及び青の各色蛍光体層からなるカラー蛍光面４が形成され、このカラー蛍光面４に対向して本発明による色選別機構５が配置され、陰極線管体２のネック部７に電子銃６が配置されてなる。８は偏向ヨークを示す。
このカラー陰極線管１では、電子銃６から出射した赤、緑、青用の３本の電子ビームが色選別機構５によってカラー蛍光面４に照射され、且つ偏向ヨーク８により水平、垂直方向に走査され、所要の画像を表示する。
【００１５】
図２〜図３は、本発明の色選別機構５_１の一実施の形態を示す。本実施の形態に係る色選別機構５_１は、アパーチャグリルと称されるものであり、図２に示すように、１対の相対向する支持部材１１，１２と、この支持部材１１，１２の両端間に差し渡されるようにして溶接された１対の弾性賦与部材１３，１４とからなる枠状のフレーム２７が設けられ、このフレーム２７の相対向する支持部材１１，１２上間に一方向、即ちストライプ状蛍光体層の配列方向、例えば画面水平方向（Ｘ方向）に沿って配置された多数のスリット状のビーム透過孔２５を有するマスク部材、即ち色選別用電極薄板２６が架張されて成る。
【００１６】
色選別用電極薄板２６は、例えばステンレス材による金属薄板からなり、多数の細い帯状のグリット素体２４を上記一方向に所定のピッチをもって配列し、各隣合うグリット素体２４間にストライプ状蛍光体層の長手方向、例えば画面垂直方向（Ｙ方向）に長いスリット状のビーム透過孔２５を形成して構成される。
【００１７】
なお、図示せざるも、色選別機構５_１は３点支持、又は４点支持で陰極線管のパネル部３内に支持される。このため、フレームの支持部材１１，１２、弾性賦与部材１３、１４のうちの３辺、あるいは全辺に、スプリングホルダを介して先端にパネルピンが係止する係止孔を有する支持スプリングが取り付けられる。
【００１８】
そして、本実施の形態においては、特に色選別機構５_１のフレーム２７を断面Ｌ字型の支持部材１１，１２と中空構造の両端部が屈曲された弓形の弾性賦与部材１３，１４とから構成される。弾性賦与部材１３，１４は、図３Ａ〜Ｃに示すように、中央に直線部分１７ａを有し直線部分１７ａの両端側に曲率をもつ屈曲部１７ｂが形成られて全体が弓形状をなす断面コ字形部材１７と、この断面コ字形部材１７の直線部分１７ａの開口を閉塞する閉塞板１８とにより形成される。断面コ字形部材１７は、例えばプレス成形で加工される。これによって、弓形状をなす弾性賦与部材１３，１４の直線部分では中空構造（中空部材）となり、両端側の屈曲部分では一方が開口された断面コ字形構造となる。閉塞板１８は断面コ字形部材１７に対して、例えばティグ（Ｔｉｇ）溶接で接合される。
【００１９】
閉塞板１８は、断面コ字形部材１７より熱膨張係数の大きい材料で形成される。従って、弾性付与部材１３，１４は、熱膨張係数の異なる断面コ字形部材１７と閉塞板１８とにより、いわゆるバイメタル構造となる。断面コ字形部材１７の開口及びこの開口を閉塞する閉塞板１８は、色選別用電極薄板２６が架張される面とは反対側の面に設けられる。一方、支持部材１１，１２は、直角に折曲し水平部１５Ｈ及び垂直部１５Ｖを有した断面Ｌ字形に形成される。弓形の弾性付与部材１３，１４の夫々の端部は、支持部材１１，１２の水平部１５Ｈに溶接等により接合される。
【００２０】
断面コ字形部材１７の長さＬ_１に対する閉塞板１８の長さＬ_２の比率Ｌ_２／Ｌ_１は、０．５〜０．８の範囲に選定するのが好ましい。比率Ｌ_２／Ｌ_１＝０．５〜０．８の範囲で閉塞板１８の長さと断面形状（板厚か板幅）を選定することで、弾性賦与部材１３，１４、引いてはフレーム２７の機械的強度と、バイメタル構造による温度ドリフト補正、つまり陰極線管特性の確保が可能になる。また、比率Ｌ_２／Ｌ_１を０．５〜０．８にすることで、閉塞板１８の曲げ加工が不要になり、閉塞板１８と断面コ字形部材１７の溶接点Ｐの数も削減できる。本例では弾性賦与部材の１本当たりの溶接点が、合計３×２＝６箇所で済む。なお、本例では、閉塞板の長さが短くなる分、閉塞板１８の板厚を従来の図７Ｂに示す閉塞板４８の板厚より厚く選定される。
【００２１】
図５は、本実施の形態の色選別機構５_１の黒化処理後の色選別用電極薄板２６と、前述の図６に示す従来の色選別機構４０の黒化処理後の色選別用電極薄板５６の夫々の張力分布（ＡＧ張力分布）を比較したグラフである。曲線ａは本実施の形態の比率Ｌ_２／Ｌ_１が０．５の弾性賦与部材を用いたときの張力分布、曲線ｂは本実施の形態の比率Ｌ_２／Ｌ_１が０．８の弾性賦与部材を用いたときの張力分布、曲線ｃは従来の弾性賦与部材を用いたときの張力分布を示す。
なお、色選別機構の黒化処理は、１）色選別用電極薄板をフレームに架張したときに生じる歪みを取るため、２）蛍光面作成の露光時に色選別機構での露光光の反射防止のため、３）表面酸化して防錆効果を得るために行われる。
【００２２】
図５のグラフによれば、弾性賦与部材の長さに対する閉塞板の長さの比率Ｌ_２／Ｌ_１を小さくすると、色選別用電極薄板の張力分は低下するが、実用に供し得る所要の張力分布が確保でき、実用上問題ないことが認められる。
【００２３】
上述の本実施の形態によれば、色選別機構５_１において、そのフレーム２７を構成する弾性賦与部材１３，１４を弓形の断面コ字形部材１７とこの開口を閉塞する閉塞板１８とで構成し、閉塞板１８が取り付けられた部分を中空部材として構成することにより、弾性賦与部材１３，１４（従ってフレーム２７）の軽量化が図れると共に、機械的強度も向上する。従って、色選別機構５_１の軽量化、機械的強度の向上を図ることができる。弾性賦与部材１３，１４が弓形であるので、色選別用電極薄板２６を架張する際にフレーム２７を撓ませるとき、色選別用電極薄板２６の面に垂直のＺ方向へ撓み易くなり、色選別用電極薄板２６を所望の張力で架張することが可能になる。
【００２４】
閉塞板１８の長さＬ_２と断面コ字形部材１７の長さの比率Ｌ_２／Ｌ_１を０．５〜０．８の範囲に選定し、本例では弓形の直線部分に閉塞板１８を取り付けた構成とすることにより、弾性賦与部材１３，１４の閉塞板１８が取り付けられない両端側は、断面コ字形部材１７がそのまま臨み開放状態に構成される。これにより、塵等の検査がし易くなり、また直線部分の中空内に塵が入っても、両端側から塵を容易にの取り出すことができる。
【００２５】閉塞板１８は直線部分に設けられるので、曲げ加工する必要がない。また、閉塞板１８は弓形の断面コ字形部材１７の直線部分に溶接するので、溶接点の数が削減される。従って、色選別機構５_１の製造コストを低減でる。
閉塞板１８を断面コ字形部材１７より熱膨張係数の大きい材料で形成することにより、弾性賦与部材１３，１４自体をバイメタル構造とすることができる。これにより、陰極線管の動作時の温度ドリフト補正を適正に行うことができる。又、黒化処理等の熱処理工程において、色選別用電極薄板２６が熱的影響を受けた際、このバイメタル構造により、色選別用電極薄板２６の張力を低減させる方向に弾性賦与部材１３，１４が湾曲変形し、色選別用電極薄板２６に加わっている応力（即ち、張力）が低減される。この結果、熱クリープ現象が緩和され、熱処理後の常温に戻った状態で張力を高く維持することができる。
【００２６】
かかる色選別機構５_１を組み込んだカラー陰極線管によれば、色選別機構５_１がらの塵の管体内への放出がなくなり、塵による放電を抑制するとができる。従って、高品質で安くて軽い色選別機構５_１を備えたカラー陰極線管１を提供することができる。
【００２７】
図４Ａ〜Ｃは、本発明の他の実施の形態に係わる色選別機構、特に弾性賦与部材を示す。本実施の形態の色選別機構５_２（同図は、色選別用電極薄板を省略している）を構成する弾性賦与部材３３，３４は、両端を折曲したＵ字形をなし、断面コ字形部材３７と、この断面コ字形部材３７の両端側を除く中央部分の直線部分３７ａの開口を閉塞する閉塞板３８とにより形成される。これによって、Ｕ字形をなす弾性賦与部材３３，３４の直線部分では中空構造（中空部材）となり、折曲部を含む両端側では一方が開口された断面コ字形構造となる。
【００２８】
本例においても、閉塞板３８は、断面コ字形部材３７より熱膨張係数の大きい材料で形成される。従って、弾性付与部材３３，３４は、熱膨張係数の異なる断面コ字形部材３７と閉塞板３８とにより、いわゆるバイメタル構造となる。断面コ字形部材３７の開口及びこの開口を閉塞する閉塞板３８は、色選別用電極薄板２６が架張される面とは反対側の面に設けられる。また、断面コ字形部材３７の長さＬ_１に対する閉塞板３８の長さＬ_２の比率Ｌ_２／Ｌ_１は、０．５〜０．８の範囲に選定する。本例では弾性賦与部材の１本当たりの溶接点が、合計３×２＝６箇所で済む。
【００２９】
図４に示す本実施の形態においても、前述の弓形構造による効果を除いて、図２及び図３に示す色選別機構５_１と同様の作用効果を奏する。また、この色選別機構５_２を備えたカラー陰極線管も、前述の色選別機構５_１を備えたカラー陰極線管と同様の効果を奏する。
【００３０】
【発明の効果】
本発明に係る色選別機構によれば、そのフレームを構成する弾性賦与部材を断面コ字形部材とこの開口を閉塞する閉塞板とで構成し、閉塞板が取り付けられた部分を中空部材として構成することにより、フレームの軽量化が図れると共に、機械的強度を向上することができる。従って、色選別機構の軽量化、機械的強度の向上を図ることができる。
閉塞板の長さＬ_２と断面コ字形部材の長さの比率Ｌ_２／Ｌ_１を０．５〜０．８の範囲に選定し、弾性賦与部材の閉塞板が取り付けられない両端側を断面コ字形部材がそのまま臨む開放状態に構成するので、塵等の検査がし易くなり、また直線部分の中空内に塵が入っても、両端側から塵を容易にの取り出すことができる。
閉塞板は直線部分に設けられるので、曲げ加工する必要がない。また閉塞板は弓形の断面コ字形部材の直線部分に溶接するので、溶接点の数が削減される。
このように本発明では、材料コスト、加工コストの増大を抑制しつつフレームの軽量化、機械的強度を確保し、且つ製造コストを低減した色選別機構を提供することできる。
閉塞板を断面コ字形部材より熱膨張係数の大きい材料で形成することにより、弾性賦与部材自体をバイメタル構造とすることができる。これにより、陰極線管の動作時の温度ドリフト補正を適正に行うことができる。
【００３１】
本発明に係るカラー陰極線管によれば、上述の色選別機構を備えることにより、色選別機構からの塵の管体内への放出がなくなり、塵による放電の抑制を可能にし、また、軽量化を図って温度ドリフト補正を適正に行える等、軽量且つ品質の安定し、コスト低減を可能にした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】本発明に係るカラー陰極線管の一実施の形態を示す概略構成図である。
【図２】本発明に係る色選別機構の一実施の形態を示す概略構成図（斜視図）である。
【図３】Ａ　図２の色選別機構の弾性賦与部材を示す拡大図である。
Ｂ　図３ＡのＡ_１−Ａ_１線上の断面図である。
Ｃ　図３ＡのＢ_１−Ｂ_１線上の断面図である。
【図４】Ａ　本発明の他の実施の形態に係る色選別機構、特にその弾性付与部材を示す拡大図である。
Ｂ　図４ＡのＡ_２−Ａ_２線上の断面図である。
Ｃ　図４ＡのＢ_２−Ｂ_２線上の断面図である。
【図５】本発明の色選別機構と従来の色選別機構を比較した色選別用電極薄板の張力分布図である。
【図６】従来の色選別機構の例を示す概略構成図（斜視図）である。
【図７】Ａ　図６の色選別機構の弾性賦与部材を示す拡大図である。
Ｂ　図７ＡのＣ−Ｃ線の断面図である。
【符号の説明】
１・・カラー陰極線管、２・・陰極線管体、３・・パネル部、４・・蛍光面、６・・電子銃、７・・ネック部、８・・偏向ヨーク、５，５_１，５_２，４０・・色選別機構、１１，１２，４１，４２・・支持部材、１３，１４，３３，３４，４３，４４・・弾性賦与部材、１７，３７，４７・・断面コ字形部材、１８，３８，４８・・閉塞板（温度補償部材）、２７，５７・・フレーム、２４，５４・・グリット素体、２５，５５・・ビーム透過孔、２６，５６・・色選別用電極薄板[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a color identification mechanism and a color cathode ray tube including the color selection mechanism.
[0002]
[Prior art]
As a color identification mechanism for a color cathode ray tube, for example, a color selection mechanism 40 called an aperture grill as shown in FIGS. 6 and 7 is known. (See JP-A-2002-8555).
As shown in FIG. 6, the color selection mechanism 40 includes a pair of opposing support members 41 and 42, and a pair of elastic application members which are welded so as to be inserted between both ends of the support members 41 and 42. A frame-like frame 57 including members 43 and 44 is provided, and a number of slit-like frames are arranged between the opposing support members 41 and 42 of the frame 57, that is, along the screen horizontal direction (X direction). A mask member having the beam transmitting holes 55, that is, a color selecting electrode thin plate 56 is stretched.
[0003]
As shown in FIGS. 7A and 7B, the elasticity imparting members 43 and 44 have an arcuate structure in which both ends are bent with a curvature so as to have sufficient spring elasticity as a whole, and have a U-shaped section 47 and a cross-section of the section 47 over the entire length. A closing plate 48 for closing the opening of the U-shaped member 47 is formed in a welded hollow structure. The elasticity providing members 43 and 44 have a closing plate 48 formed of a member having a larger thermal expansion coefficient than the U-shaped member 47 and have a bimetal structure with the U-shaped member 47 and the closing plate 48. The closing plate 48 also serves as a so-called temperature compensating member. On the other hand, the elasticity imparting members 43 and 44 absorb the plastic deformation elongation of the color selection electrode thin plate 56 in the cathode ray tube manufacturing process and the temporary elongation of the color selection electrode thin plate 56 due to the irradiation of the electron beam during the operation of the cathode ray tube. Has a role.
[0004]
The color-selecting electrode thin plate 56 is made of, for example, a metal thin plate made of stainless steel, and has a large number of thin strip-shaped grit element bodies 54 arranged at predetermined intervals in the above-described one direction. It is configured by forming a slit-shaped beam transmission hole 55 long in the (Y direction).
[0005]
In the above-described color selection mechanism 40, the elasticity imparting members 43 and 44 constituting the frame 57 have a hollow structure, so that light weight and mechanical strength can be maintained. At the same time, the elasticity imparting members 43 and 44 themselves have a bimetal structure, which contributes to correction of mislanding due to temperature drift during operation of the cathode ray tube, and enables the weight of the color selection mechanism 40 as a whole to be reduced.
[0006]
[Problems to be solved by the invention]
By the way, in the above-described color selection mechanism 40, the elasticity imparting members 43 and 44 have a hollow structure in which the closing plate 48 is attached over the entire length, and have a configuration in which the ends are opened. Dust that has entered is difficult to remove, and in the worst case, when the dust is discharged into the cathode ray tube, a discharge occurs, which may cause a failure of the color cathode ray tube, for example, a failure of a television circuit. Further, since the closing plate 48 is attached to the entire length of the bow-shaped elasticity applying members 43 and 44, the bending of the closing plate 48 in an arc shape increases the cost and makes it difficult to obtain the processing accuracy. Furthermore, the closing plate 48 is attached to the entire length of the elasticity imparting member, that is, the U-shaped member 47 by Tig welding or the like. However, since the closing plate 48 is long, the number of welding points P increases. For example, as shown in FIGS. 7A and 7B, welding per elasticity imparting member is performed at both ends (2 × 2 = 4), at a bent portion (2 × 2 = 4), and at a center portion (1 × 2 = 4). 2) 10 points are required in total, and the welding cost increases. TIG welding is a method of welding by generating an arc between a tungsten electrode and a base material in an inert gas such as argon.
[0007]
In view of the above, the present invention provides a highly reliable color selection mechanism that is lightweight, has high mechanical strength, is easy to process, and does not cause a failure, and a highly reliable color provided with this color selection mechanism. A cathode ray tube is provided.
[0008]
[Means for Solving the Problems]
In the color selection mechanism according to the present invention, a color selection electrode thin plate is stretched on a frame including a pair of support members and a pair of elasticity imparting members, and the elasticity imparting member has a U-shaped cross section member and an opening thereof. It consists of a closing plate that closes, the central part to which the closing plate is attached is formed as a hollow member, the other part is formed of a U-shaped member, and the closing plate is formed of a material having a larger thermal expansion coefficient than the U-shaped member. is, the ratio _L 2 / _{L 1} of the U-shaped section of the closure plate to the length _{L 1} of the member length _{L 2} is a set configured to 0.5-0.8.
According to the present invention, in the above-mentioned color selection mechanism, it is preferable that the elasticity imparting member is formed in an arc shape, a closing plate is attached to a central straight portion of the arc shape, and both ends of the arc shape are joined to a pair of support members.
[0009]
In the color selection mechanism of the present invention, the elasticity imparting member constituting the frame is composed of a U-shaped cross section member and a closing plate closing the opening thereof, the central portion of the elasticity imparting member is a hollow member, and the other portions are U-shaped cross sections. By using a member, the weight of the color selection mechanism can be reduced and the mechanical strength can be improved, and the other parts can be opened with a U-shaped cross section, making it easier to inspect for dust and the like. Is also easy to take out. Closure plate is formed of a material having a high coefficient of thermal expansion than the U-shaped section members, the U-shaped cross section ratio L _{2 /} L ₁ of the occlusion length of plate L ₂ to the length L ₁ of the member 0.5-0.8 By setting to, the bimetal function of the elasticity imparting member is sufficiently achieved.
The U-shaped cross section member of the elasticity imparting member is formed in an arc shape, and when the closing plate is attached to the central straight portion of the arc shape, the elasticity imparting member can have more elasticity, and the bending of the closing plate is unnecessary. In addition, the number of welding points is reduced, thereby facilitating manufacturing and reducing costs.
[0010]
In the color cathode ray tube according to the present invention, a color selecting electrode thin plate is stretched on a frame including a pair of supporting members and a pair of elastic applying members, and the elastic applying member closes the U-shaped member and its opening. The central portion to which the closing plate is attached is formed as a hollow member, the other portion is formed of a U-shaped member, and the closing plate is formed of a material having a larger coefficient of thermal expansion than the U-shaped member. , a structure having a color selecting the ratio _L 2 / _{L 1} of the U-shaped section of the closure plate to the length _{L 1} of the member length _{L 2} is set to 0.5 to 0.8.
The present invention provides a color cathode ray tube in which an elasticity imparting member is formed in an arc shape in a color discriminating mechanism, a closing plate is attached to a central straight portion of the arc shape, and both ends of the arc shape are joined to a pair of support members. Is preferred.
[0011]
Since the color cathode ray tube of the present invention includes the above-described color selection mechanism, the weight can be reduced, and mislanding due to temperature drift can be properly corrected by the bimetal structure of the elasticity imparting member itself of the frame. There is no generation of dust from the color selection mechanism, and no inconvenience such as discharge in the tube occurs. By facilitating the manufacture of the color selection mechanism, the cost of manufacturing the color cathode ray tube can be reduced.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
[0013]
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0014]
FIG. 1 shows an embodiment of a color cathode ray tube according to the present invention.
In the color cathode ray tube 1 according to the present embodiment, a color phosphor screen 4 composed of, for example, striped red, green and blue phosphor layers is formed on the inner surface of the panel portion 3 of the cathode ray tube body 2. A color selection mechanism 5 according to the present invention is disposed facing the surface 4, and an electron gun 6 is disposed on a neck portion 7 of the cathode ray tube 2. Reference numeral 8 denotes a deflection yoke.
In this color cathode ray tube 1, three electron beams for red, green and blue emitted from an electron gun 6 are irradiated on a color phosphor screen 4 by a color selection mechanism 5, and scanned in a horizontal and vertical direction by a deflection yoke 8. And display the required image.
[0015]
Figures 2-3 illustrate an embodiment of a color selecting 5 ₁ of the present invention. Color selecting 5 ₁ according to this embodiment is what is called an aperture grille, as shown in FIG. 2, the supporting members 11 and 12 facing each of the pair of the support members 11 and 12 A frame-like frame 27 including a pair of elastic applying members 13 and 14 welded so as to extend between both ends is provided, and one direction is provided between opposing support members 11 and 12 of the frame 27. That is, a mask member having a large number of slit-shaped beam transmitting holes 25 arranged along the arrangement direction of the stripe-shaped phosphor layers, for example, the horizontal direction (X direction) of the screen, that is, a color selection electrode thin plate 26 is stretched. Consisting of
[0016]
The color-selecting electrode thin plate 26 is made of a metal thin plate made of, for example, stainless steel, and has a large number of thin strip-shaped grit element bodies 24 arranged at a predetermined pitch in the above-mentioned one direction. It is formed by forming a slit-shaped beam transmitting hole 25 that is long in the longitudinal direction of the body layer, for example, in the screen vertical direction (Y direction).
[0017]
Even unshown, color selecting mechanism 5 ₁ is supported in the three-point support, or a cathode ray tube of the panel portion 3 in the four-point support. For this reason, a support spring having a locking hole for locking a panel pin at a distal end is attached to three or all of the support members 11 and 12 and the elasticity providing members 13 and 14 of the frame via a spring holder. .
[0018]
Then, consist present in the embodiment, in particular color selecting 5 ₁ frame 27 a cross-sectional L-shaped support members 11 and 12 and both end portions of the hollow structure is bent arcuate elasticity imparting member 13 and 14 Is done. As shown in FIGS. 3A to 3C, the elasticity imparting members 13 and 14 each have a straight portion 17 a at the center and a bent portion 17 b having a curvature at both ends of the straight portion 17 a to form a cross section having a bow shape as a whole. It is formed by a U-shaped member 17 and a closing plate 18 that closes an opening of a linear portion 17a of the U-shaped member 17 in cross section. The U-shaped section member 17 is processed by, for example, press molding. As a result, a hollow structure (hollow member) is formed at the linear portions of the elasticity imparting members 13 and 14 having a bow shape, and a U-shaped cross section is opened at one of the bent portions at both ends. The closing plate 18 is joined to the U-shaped member 17 by, for example, Tig welding.
[0019]
The closing plate 18 is formed of a material having a larger thermal expansion coefficient than the U-shaped member 17. Therefore, the elasticity imparting members 13 and 14 have a so-called bimetal structure by the U-shaped member 17 and the closing plate 18 having different thermal expansion coefficients. The opening of the U-shaped member 17 and the closing plate 18 for closing the opening are provided on the surface opposite to the surface on which the color-selecting electrode thin plate 26 is stretched. On the other hand, the support members 11 and 12 are bent at a right angle and formed in an L-shaped cross section having a horizontal portion 15H and a vertical portion 15V. Each end of the bow-shaped elasticity imparting members 13 and 14 is joined to the horizontal portion 15H of the support members 11 and 12 by welding or the like.
[0020]
A U-shaped cross section ratio _L 2 / _{L 1} length _{L 2} of the closure plate 18 to the length _{L 1} of the member 17 is preferably selected in the range of 0.5 to 0.8. By selecting the length and cross-sectional shape (plate thickness or plate width) of the closing plate 18 in the range of L ₂ / L ₁ = 0.5 to 0.8, the elasticity applying members 13 and 14 and the frame 27 can be pulled. And the temperature drift correction by the bimetal structure, that is, the cathode ray tube characteristics can be secured. Further, by setting the ratio _L 2 / _{L 1} to 0.5 to 0.8, of the closure plate 18 bending is not required, the number of welding points P of the closure plate 18 and a U-shaped section member 17 can also be reduced . In this example, the number of welding points per elastic providing member is 3 × 2 = 6 in total. In this example, the thickness of the closing plate 18 is selected to be larger than the thickness of the conventional closing plate 48 shown in FIG.
[0021]
Figure 5 is a color selection electrode thin plate 26 after blackening treatment of the color selection mechanism 5 ₁ of the present embodiment, the color selecting electrode after blackening treatment of a conventional color selecting mechanism 40 shown in FIG. 6 above It is the graph which compared each tension distribution (AG tension distribution) of the thin plate 56. A curve a represents a tension distribution when the elasticity imparting member of the present embodiment has a ratio L ₂ / L ₁ of 0.5, and a curve b represents an elasticity of the embodiment having a ratio L ₂ / L ₁ of 0.8. The tension distribution when the applying member is used, and the curve c shows the tension distribution when the conventional elastic applying member is used.
The blackening process of the color selection mechanism 1) removes distortion generated when the electrode plate for color selection is stretched over a frame, and 2) prevents reflection of exposure light by the color selection mechanism at the time of exposure for forming a fluorescent screen. Therefore, it is performed in order to obtain a rust preventive effect due to surface oxidation.
[0022]
According to the graph of FIG. 5, when the ratio L ₂ / L ₁ of the length of the closing plate to the length of the elasticity imparting member is reduced, the amount of tension of the color-selecting electrode thin plate is reduced. It is recognized that the tension distribution can be secured and there is no practical problem.
[0023]
According to the present embodiment described above, in the color selecting mechanism 5 _1, constituted by the elasticity imparting members 13 and 14 constituting the frame 27 and the arcuate cross-section U-shaped member 17 and the closing plate 18 for closing the opening By configuring the portion to which the closing plate 18 is attached as a hollow member, the elasticity imparting members 13 and 14 (therefore, the frame 27) can be reduced in weight and the mechanical strength can be improved. Therefore, weight of the color selecting 5 _1, it is possible to improve the mechanical strength. Since the elasticity imparting members 13 and 14 are arcuate, when the frame 27 is bent when the color selecting electrode thin plate 26 is stretched, the frame 27 is easily bent in the Z direction perpendicular to the surface of the color selecting electrode thin plate 26, and It becomes possible to stretch the sorting electrode thin plate 26 with a desired tension.
[0024]
The ratio _L 2 / _{L 1} length of length _{L 2} and a U-shaped section member 17 of the closure plate 18 is selected in the range of 0.5 to 0.8, in this example a closure plate 18 to the linear portion of the arcuate With the attached structure, the elastic applying members 13 and 14 are open at both ends of the elastic applying members 13 and 14 to which the closing plates 18 are not attached, with the U-shaped section 17 facing directly. This makes it easier to inspect dust and the like, and even if dust enters the hollow portion of the linear portion, dust can be easily removed from both ends.
Since the closing plate 18 is provided at the straight portion, there is no need for bending. Further, since the closing plate 18 is welded to the straight portion of the arcuate U-shaped member 17, the number of welding points is reduced. Thus, leaving reduce the manufacturing cost of the color selecting 5 _1.
By forming the closing plate 18 from a material having a larger coefficient of thermal expansion than the U-shaped member 17, the elasticity imparting members 13 and 14 themselves can have a bimetal structure. This makes it possible to appropriately correct the temperature drift during the operation of the cathode ray tube. Further, in a heat treatment step such as a blackening process, when the color selecting electrode thin plate 26 is thermally affected, the bimetal structure causes the elasticity imparting members 13 and 14 to decrease the tension of the color selecting electrode thin plate 26. Are curved and deformed, and the stress (that is, tension) applied to the color selecting electrode thin plate 26 is reduced. As a result, the thermal creep phenomenon is alleviated, and the tension can be maintained high in a state where the temperature returns to the normal temperature after the heat treatment.
[0026]
According to the color cathode ray tube incorporating such a color selecting 5 _1, there is no color selecting 5 ₁ grounds the release of the tube body of dust can and suppresses discharge by dust. Therefore, it is possible to provide a color cathode ray tube 1 having a lighter color selecting 5 ₁ cheap with high quality.
[0027]
4A to 4C show a color selection mechanism according to another embodiment of the present invention, particularly an elasticity imparting member. Color selecting 5 ₂ of the present embodiment _(the figure is omitted color selecting electrode thin plate) elasticity imparting members 33 and 34 constituting the can forms a U-shaped bent at both ends, a U-shaped cross section It is formed by a member 37 and a closing plate 38 for closing an opening of a straight portion 37a in a central portion excluding both end sides of the U-shaped section 37. As a result, the linear portions of the U-shaped elasticity imparting members 33 and 34 have a hollow structure (hollow member), and both ends including the bent portion have a U-shaped cross section in which one end is opened.
[0028]
Also in this example, the closing plate 38 is formed of a material having a larger thermal expansion coefficient than the U-shaped member 37. Therefore, the elasticity imparting members 33 and 34 have a so-called bimetal structure by the U-shaped member 37 and the closing plate 38 having different thermal expansion coefficients. The opening of the U-shaped member 37 and the closing plate 38 for closing the opening are provided on the surface opposite to the surface on which the color selecting electrode thin plate 26 is stretched. The ratio L ₂ / L ₁ of the length L ₂ of the closing plate 38 to the length L ₁ of the U-shaped member 37 is selected in the range of 0.5 to 0.8. In this example, the number of welding points per elastic providing member is 3 × 2 = 6 in total.
[0029]
Also in this embodiment shown in FIG. 4, except for the effects of arcuate structure described above, the same effects as the color selecting 5 ₁ shown in FIGS. The color cathode ray tube having the color selecting 5 ₂ also, the same effects as the color cathode ray tube having a color selection mechanism 5 ₁ described above.
[0030]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to the color selection mechanism which concerns on this invention, the elastic provision member which comprises the flame | frame is comprised by the U-shaped member of a cross section, and the closing plate which closes this opening, and the part to which the closing plate was attached is comprised as a hollow member. Thus, the weight of the frame can be reduced, and the mechanical strength can be improved. Therefore, the weight of the color selection mechanism can be reduced and the mechanical strength can be improved.
The ratio L _{2 /} L ₁ length of length L ₂ and a U-shaped section member of the closure plate selected in the range of 0.5 to 0.8, cross the both ends of the closure plate of the elasticity imparting member is not attached Since it is configured in an open state where the U-shaped member directly faces, inspection of dust and the like is easy, and even if dust enters the hollow portion of the straight portion, dust can be easily taken out from both ends.
Since the closing plate is provided in the straight portion, there is no need to perform bending. In addition, since the closing plate is welded to the straight portion of the arcuate U-shaped member, the number of welding points is reduced.
As described above, according to the present invention, it is possible to provide a color selection mechanism that secures a lighter weight frame, secures mechanical strength, and reduces manufacturing costs while suppressing increases in material costs and processing costs.
By forming the closing plate with a material having a larger coefficient of thermal expansion than that of the U-shaped member, the elasticity imparting member itself can have a bimetal structure. This makes it possible to appropriately correct the temperature drift during the operation of the cathode ray tube.
[0031]
According to the color cathode ray tube according to the present invention, the provision of the above-described color selection mechanism eliminates emission of dust from the color selection mechanism into the tube, enables suppression of discharge due to dust, and reduces weight. It is possible to provide a color cathode ray tube which is lightweight, has stable quality, and enables cost reduction, for example, by appropriately performing temperature drift correction.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing one embodiment of a color cathode ray tube according to the present invention.
FIG. 2 is a schematic configuration diagram (perspective view) illustrating an embodiment of a color selection mechanism according to the present invention.
FIG. 3A is an enlarged view showing an elasticity providing member of the color selection mechanism of FIG. 2;
It is a sectional view of _A 1 -A ₁ line of B Figure 3A.
C C is a cross-sectional view taken along the line B ₁ -B _{1 in} FIG. 3A.
FIG. 4A is an enlarged view showing a color selection mechanism according to another embodiment of the present invention, particularly an elasticity providing member thereof.
Is a cross-sectional view of the _A 2 -A ₂ line of B Figure 4A.
Is a sectional view of _B 2 -B ₂ line of C Figure 4A.
FIG. 5 is a tension distribution diagram of a color selection electrode thin plate comparing a color selection mechanism of the present invention with a conventional color selection mechanism.
FIG. 6 is a schematic configuration diagram (perspective view) showing an example of a conventional color selection mechanism.
FIG. 7A is an enlarged view showing an elasticity imparting member of the color selection mechanism of FIG. 6;
B It is sectional drawing of CC line | wire of FIG. 7A.
[Explanation of symbols]
1 .. The color cathode-ray tube, 2 ... cathode-ray tube, 3 ... panel, 4 ... phosphor screen, 6 ... electron gun, 7 .. neck, 8 ... deflection yoke, _5,5 1, 5 ₂ , 40 ... color selection mechanism, 11, 12, 41, 42 support member, 13, 14, 33, 34, 43, 44 elastic member, 17, 37, 47 member U-shaped section, 18, 38, 48 ··· closing plate (temperature compensating member), 27, 57 · · frame, 24, 54 · · · grid body, 25, 55 · · beam transmission hole, 26, 56 · · · electrode thin plate for color selection

Claims (4)

１対の支持部材と１対の弾性賦与部材とからなるフレーム上に色選別用電極薄板が架張され、
前記弾性賦与部材が、断面コ字形部材とその開口を閉塞する閉塞板とからなり、前記閉塞板を取り付けた中央部分が中空部材として構成され、他の部分が断面コ字形部材で構成され、
前記閉塞板が断面コ字形部材より熱膨張係数の大きい材料で形成され、前記断面コ字形部材の長さＬ_１に対する前記閉塞板の長さＬ_２の比率Ｌ_２／Ｌ_１が０．５〜０．８に設定されて成る
ことを特徴とする色選別機構。An electrode thin plate for color selection is stretched on a frame including a pair of support members and a pair of elasticity imparting members,
The elasticity imparting member is composed of a U-shaped cross section member and a closing plate for closing the opening thereof, a central portion to which the closing plate is attached is formed as a hollow member, and the other portions are formed of a U-shaped cross section member,
Said closure plate is formed of a material having a high coefficient of thermal expansion than the U-shaped section members, the ratio L _{2 /} L ₁ of the occlusion length of plate L ₂ is 0.5 to the length L ₁ of the U-shaped section member A color selection mechanism characterized by being set to 0.8. 前記弾性賦与部材の断面コ字形部材が弓形に形成され、
前記弓形の中央の直線部分に前記閉塞板が取り付けられ、前記弓形の両端が前記１対の支持部材に接合されて成る
ことを特徴とする請求項１記載の弾性賦与部材を備えてなる色選別機構。The U-shaped cross section member of the elasticity imparting member is formed in an arc shape,
2. The color selecting device according to claim 1, wherein the closing plate is attached to a straight portion at the center of the bow, and both ends of the bow are joined to the pair of supporting members. mechanism. １対の支持部材と１対の弾性賦与部材とからなるフレーム上に色選別用電極薄板が架張され、
前記弾性賦与部材が、断面コ字形部材とその開口を閉塞する閉塞板とからなり、前記閉塞板を取り付けた中央部分が中空部材として構成され、他の部分が断面コ字形部材で構成され、
前記閉塞板が前記断面コ字形部材より熱膨張係数の大きい材料で形成され、前記断面コ字形部材の長さＬ_１に対する前記閉塞板の長さＬ_２の比率Ｌ_２／Ｌ_１が０．５〜０．８に設定されてなる色選別機構を、
備えて成る
ことを特徴とするカラー陰極線管。An electrode thin plate for color selection is stretched on a frame including a pair of support members and a pair of elasticity imparting members,
The elasticity imparting member is composed of a U-shaped cross section member and a closing plate for closing the opening thereof, a central portion to which the closing plate is attached is formed as a hollow member, and the other portions are formed of a U-shaped cross section member,
The closing plate is formed of a material having a larger coefficient of thermal expansion than the U-shaped member, and the ratio L ₂ / L ₁ of the length L ₂ of the closing plate to the length L ₁ of the U-shaped member is 0.5. Color selection mechanism set to ~ 0.8,
A color cathode ray tube characterized by comprising: 前記フレームを構成する前記弾性賦与部材の断面コ字形部材が弓形に形成され、
前記弓形の中央の直線部分に前記閉塞板が取り付けられ、前記弓形の両端が前記１対の支持部材に接合されてなる色選別機構を、
備えて成る
ことを特徴とする請求項３記載のカラー陰極線管。The U-shaped section of the elasticity imparting member constituting the frame is formed in an arc shape,
A color selection mechanism in which the closing plate is attached to a straight portion in the center of the bow, and both ends of the bow are joined to the pair of support members,
4. The color cathode ray tube according to claim 3, wherein the color cathode ray tube is provided.

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