JP3799639B2 - Coordinate input device - Google Patents

Coordinate input device Download PDF

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JP3799639B2
JP3799639B2 JP32200795A JP32200795A JP3799639B2 JP 3799639 B2 JP3799639 B2 JP 3799639B2 JP 32200795 A JP32200795 A JP 32200795A JP 32200795 A JP32200795 A JP 32200795A JP 3799639 B2 JP3799639 B2 JP 3799639B2
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voltage
coordinate
resistance film
film
coordinate input
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JPH09160710A (en
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茂美 倉島
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Fujitsu Component Ltd
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Fujitsu Component Ltd
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【０００１】
【発明の属する技術分野】
本発明は、コンピュータの入力装置などとして使用される座標入力装置に関する。
【０００２】
【従来の技術】
従来、この種の座標入力装置として、図２３にその要部を概略的に示すようなものが提案されている（特開昭４７−３６９２３号公報参照）。
【０００３】
図２３中、１は座標の入力が行われる座標入力パネルであり、２は基板上に形成された座標面をなす抵抗膜、３〜６は抵抗値を抵抗膜２よりも小とする周囲電極、７〜１０は駆動電圧が印加される駆動電圧印加端子である。
【０００４】
また、１１は駆動電圧印加端子７〜１０に駆動電圧を印加する駆動回路、１２は先端部１２Ａを抵抗膜２に押下して接触させることにより座標入力を行う座標入力ペン、１３は座標入力ペン１２の先端部１２Ａが接触した抵抗膜２上の座標を検出する入力座標検出回路である。
【０００５】
この座標入力装置は、駆動電圧印加端子７、８に電源電圧ＶＣＣを印加し、駆動電圧印加端子９、１０に接地電圧０Ｖを印加した場合における座標入力ペン１２の先端部１２Ａが接触している位置の抵抗膜２上の電圧と、駆動電圧印加端子８、１０に電源電圧ＶＣＣを印加し、駆動電圧印加端子７、９に接地電圧０Ｖを印加した場合における座標入力ペン１２の先端部１２Ａが接触している位置の抵抗膜２上の電圧とを検出することによって、入力座標の検出を行うとするものである。
【０００６】
図２４、図２５は、この座標入力装置が有する問題点を説明するための図であり、図２４は駆動電圧印加端子７、８に電源電圧ＶＣＣを印加し、駆動電圧印加端子９、１０に接地電圧０Ｖを印加した場合に、抵抗膜２に形成される水平方向の等電位線の一部を示しており、図２５は駆動電圧印加端子８、１０に電源電圧ＶＣＣを印加し、駆動電圧印加端子７、９に接地電圧０Ｖを印加した場合に、抵抗膜２に形成される垂直方向の等電位線の一部を示している。
【０００７】
図２４において、ｉ７ａは駆動電圧印加端子７から周囲電極３に流れ出て、抵抗膜２を流れ、周囲電極４を介して駆動電圧印加端子９に流れ込む電流、ｉ８ａは駆動電圧印加端子８から周囲電極３に流れ出て、抵抗膜２を流れ、周囲電極４を介して駆動電圧印加端子１０に流れ込む電流、１４Ａ、１４Ｂ、１４Ｃは抵抗膜２に形成される等電位線の一部を示している。
【０００８】
ここに、図２４に示すように、駆動電圧印加端子７、８に電源電圧ＶＣＣを印加し、駆動電圧印加端子９、１０に接地電圧０Ｖを印加した場合、周囲電極３に流れる電流ｉ７ａ、ｉ８ａによって、周囲電極３には、駆動電圧印加端子７、８側から中央部分にかけて大きな電圧降下が生じてしまうと共に、周囲電極４に流れる電流ｉ７ａ、ｉ８ａによって、周囲電極４には、中央部分から駆動電圧印加端子９、１０側にかけて大きな電圧降下が生じてしまう。
【０００９】
このため、抵抗膜２に形成される水平方向の等電位線のうち、周囲電極３、４に近い部分の等電位線１４Ａ、１４Ｃは、周囲電極３、４に平行するものではなく、湾曲したものとなってしまい、周囲電極３側から周囲電極４側にかけて、抵抗膜２に直線性の良好でない電位分布が生じてしまう。
【００１０】
また、図２５において、ｉ８ｂは駆動電圧印加端子８から周囲電極６に流れ出て、抵抗膜２を流れ、周囲電極５を介して、駆動電圧印加端子７に流れ込む電流、ｉ１０ｂは駆動電圧印加端子１０から周囲電極６に流れ出て、抵抗膜２を流れ、周囲電極５を介して駆動電圧印加端子９に流れ込む電流、１５Ａ、１５Ｂ、１５Ｃは抵抗膜２に形成される等電位線の一部を示している。
【００１１】
ここに、図２５に示すように、駆動電圧印加端子８、１０に電源電圧ＶＣＣを印加し、駆動電圧印加端子７、９を接地した場合、周囲電極６に流れる電流ｉ８ｂ、ｉ１０ｂによって、周囲電極６には、駆動電圧印加端子８、１０側から中央部分にかけて大きな電圧降下が生じてしまうと共に、周囲電極５に流れる電流ｉ８ｂ、ｉ１０ｂによって、周囲電極５には、中央部分から駆動電圧印加端子７、９側にかけて大きな電圧降下が生じてしまう。
【００１２】
このため、抵抗膜２に形成される垂直方向の等電位線のうち、周囲電極６、５に近い部分の等電位線１５Ａ、１５Ｃは、周囲電極６、５に平行するものではなく、湾曲したものとなってしまい、周囲電極６側から周囲電極５側にかけて、抵抗膜２に直線性の良好でない電位分布が生じてしまう。
【００１３】
このように、この座標入力装置においては、抵抗膜２に直線性の良好な電位分布を発生させることができず、精度の高い座標入力を行うことができないという問題点があった。
【００１４】
そこで、また、従来、図２６に示すように、周辺電極３〜６の平面形状をパラボラ形にすることにより、抵抗膜２の周辺電極３〜６に近い部分の等電位線の直線性を高め、抵抗膜２に直線性の良好な電位分布を発生させるという方法が提案されている（前掲特開昭４７−３６９２３号公報参照）。
【００１５】
【発明が解決しようとする課題】
しかし、このように、周辺電極３〜６の平面形状をパラボラ形にする場合には、抵抗膜２上、座標を入力することができる領域が狭くなってしまうという問題点があった。
【００１６】
ここに、抵抗膜２と周囲電極３〜６との面抵抗比を大きくする場合には、周囲電極３〜６の湾曲を小さくすることができるが、このようにする場合には、相対的に周囲電極３〜６の抵抗値が減少し、消費電流が増加してしまうという問題点があった。
【００１７】
また、従来、抵抗膜２に対して一定の間隔をもって電圧検出用導電膜を対向させ、座標の入力は、電圧検出用導電膜の入力座標に対応する位置の抵抗膜２との対向部分を加圧して抵抗膜２に接触させることにより行い、入力座標の検出は、抵抗膜２上、電圧検出用導電膜を介して入力座標として選択された位置の電圧を検出することにより行うように構成された座標入力装置が提案されている（特開平６−１８７０８３号公報参照）。
【００１８】
この座標入力装置においては、電圧検出用導電膜が抵抗膜２に接触したことが検出された場合に、直交する方向の電位分布を抵抗膜２に交互に発生させるための駆動電圧が駆動電圧印加端子７〜１０に印加される。
【００１９】
ここに、電圧検出用導電膜が抵抗膜２に接触したか否かの検出は、電圧検出用導電膜に一定の電圧を印加すると共に、駆動電圧印加端子７〜１０に接地電圧０Ｖを印加しておき、電圧検出用導電膜が抵抗膜２に接触した場合における電圧検出用導電膜の電圧を検出することにより行われる。
【００２０】
しかし、このように、電圧検出用導電膜の電圧を検出する方法による場合には、接触抵抗が変化すると、検出電圧が変化してしまい、電圧検出用導電膜が抵抗膜２に接触した場合においても、これを検出することができず、入力座標の検出を行うことができない場合が発生してしまうという問題点があった。
【００２１】
本発明は、かかる点に鑑み、精度の高い座標入力を行うことができるようにした座標入力装置を提供することを目的とする。
【００２２】
【課題を解決するための手段】
本発明は第１の発明〜第５の発明を含むものであり、これら第１の発明〜第５の発明の座標入力装置は、矩形状の基板と、この基板上に形成された抵抗膜と、この抵抗膜上の周辺部に枠状に形成され、直交する電位分布を抵抗膜に交互に発生させるための駆動電圧が四隅に印加される電位分布発生用電極とを備え、抵抗膜の所定の領域を直交座標面とする座標入力パネルを有し、抵抗膜上、入力座標として選択された位置の電圧を検出することにより、入力座標の検出を行う座標入力装置を改良するものである。
【００２３】
第１の発明の座標入力装置においては、抵抗膜は、Ｙ軸（縦軸）方向に延びる垂線及びＸ軸（横軸）方向に延びる水平線からなる格子状に、かつ、垂線及び水平線の線幅をそれぞれ同一ないし略同一とし、垂線及び水平線のピッチがそれぞれ中央部にいくに従って大きくなるようにパターニングされる。
【００２４】
この第１の発明の座標入力装置によれば、電位分布発生用電極における電圧降下を小さくし、電位分布発生用電極の近くに形成される等電位線の直線性を高め、抵抗膜に直線性の良好な電位分布を発生させることができる。
【００２５】
第２の発明の座標入力装置においては、抵抗膜は、Ｙ軸方向に延びる垂線及びＸ軸方向に延びる水平線からなる格子状に、かつ、垂線及び水平線のピッチをそれぞれ同一ないし略同一とし、垂線及び水平線のうち、少なくとも、電位分布発生用電極が長さ方向に重畳されていない水平線及び垂線の線幅がそれぞれ中央部にいくに従って小さくなるようにパターニングされる。
【００２６】
この第２の発明の座標入力装置によっても、電位分布発生用電極における電圧降下を小さくし、電位分布発生用電極の近くに形成される等電位線の直線性を高め、抵抗膜に直線性の良好な電位分布を発生させることができる。
【００２７】
第３の発明においては、抵抗膜上の周辺部に枠状の電位分布発生用電極を設けず、この代わりに、直交する電位分布を抵抗膜に交互に発生させるための駆動電圧が印加される駆動電圧印加用電極を抵抗膜の四隅に設けると共に、抵抗膜の周辺部、かつ、駆動電圧印加用電極間に、電位分布を発生させるための三角形ないし略三角形からなる電位分布発生用電極が間隙をもって、かつ、隣接するもの同士が１８０度ないし略１８０度回転させた関係となるように配列される。
【００２８】
この第３の発明の座標入力装置によれば、電位分布発生用電極が配列されている部分の電圧降下を小さくし、電位分布発生用電極が配列されている部分の近くに形成される等電位線の直線性を高め、抵抗膜に直線性の良好な電位分布を発生させることができる。
【００２９】
第４の発明の座標入力装置においては、抵抗膜上、入力座標として選択された位置の電圧と、電位分布発生用電極の所定の位置の電圧とを検出して、抵抗膜上、入力座標として選択された位置の電圧と、電位分布発生用電極の所定の位置の電圧とから入力座標を検出する入力座標検出手段が設けられる。
【００３０】
この第４の発明の座標入力装置によれば、抵抗膜に発生する電位分布の非線形性を考慮し、実際に入力された座標の検出を行うことができる。
【００３１】
なお、電位分布発生用電極の所定の位置の電圧を検出する手段として、電位分布発生用電極を構成する各辺の中央部ないし略中央部に、その先端を抵抗膜上に突出させ、かつ、抵抗膜に接触させた電位分布発生用電極よりも低抵抗の電圧検出用電極を設ける場合には、電位分布発生用電極の近くに形成される等電位線の湾曲を緩和することができる。
【００３２】
第５の発明の座標入力装置においては、電位分布発生用電極の所定の位置の電圧を検出して、抵抗膜に発生する電位分布の直線性を高めるための駆動電圧を電位分布発生用電極の所定の位置に印加する電圧検出・駆動電圧発生手段が備えられる。
【００３３】
この第５の発明の座標入力装置によれば、電圧検出・駆動電圧発生手段により、電位分布発生用電極の近くに形成される等電位線の直線性を高め、抵抗膜に直線性の良好な電位分布を発生させることができる。
【００３４】
なお、この場合も、電位分布発生用電極の所定の位置の電圧を検出する手段として、電位分布発生用電極を構成する各辺の中央部ないし略中央部に、その先端を抵抗膜上に突出させ、かつ、抵抗膜に接触させた電位分布発生用電極よりも低抵抗の電圧検出用電極を設けるようにしても良い。
【００３５】
また、第１の発明から第５の発明において、抵抗膜に対して一定の間隔をもって電圧検出用導電膜を対向させ、入力座標の選択は、電圧検出用導電膜の入力座標に対応する位置の抵抗膜との対向部分を抵抗膜に接触させることにより行い、入力座標の検出は、抵抗膜上、電圧検出用導電膜を介して入力座標として選択された位置の電圧を検出することにより行うように構成することもできる。
【００３６】
また、この場合において、電圧検出用導電膜が抵抗膜に接触した場合に、電圧検出用導電膜側から抵抗膜側に電流を流し、この電流を検出することにより、電圧検出用導電膜が抵抗膜に接触したことを検出する電圧検出用導電膜接触検出手段と、この電圧検出用導電膜接触検出手段により電圧検出用導電膜が抵抗膜に接触したことが検出された場合に、駆動電圧を座標入力パネルに供給する駆動電圧供給手段とを備えるようにしても良い。
【００３７】
【発明の実施の形態】
以下、図１〜図２２を参照して、本発明の座標入力装置の実施の第１の形態〜第９の形態について説明する。
【００３８】
第１の形態・・図１〜図６
図１は本発明の座標入力装置の実施の第１の形態の要部を概略的に示す図である。図１中、２０は座標入力パネルであり、２１は座標面、２２〜２５は座標面２１の周囲に枠状、かつ、帯状に一体として形成された電位分布発生用電極をなす周囲電極である。
【００３９】
また、２６〜２９は駆動電圧が印加される駆動電圧印加端子であり、駆動電圧印加端子２６には電源電圧ＶＣＣ又は接地電圧０Ｖが印加され、駆動電圧印加端子２７には電源電圧ＶＣＣが印加され、駆動電圧印加端子２８には接地電圧０Ｖが印加され、駆動電圧印加端子２９には電源電圧ＶＣＣ又は接地電圧０Ｖが印加される。
【００４０】
また、３０は駆動電圧印加端子２６、２９に電源電圧ＶＣＣ又は接地電圧０Ｖを印加するためのスイッチ回路であり、このスイッチ回路３０は、駆動電圧印加端子２６に電源電圧ＶＣＣを印加する場合には、駆動電圧印加端子２９に接地電圧０Ｖを印加し、駆動電圧印加端子２６に接地電圧０Ｖを印加する場合には、駆動電圧印加端子２９に電源電圧ＶＣＣを印加するように制御される。
【００４１】
また、３１は先端部３１Ａを座標面２１に接触させることにより座標入力を行う座標入力ペン、３２はスイッチ制御信号によりスイッチ回路３０を制御すると共に、座標入力ペン３１の先端部３１Ａが接触した座標面２１上の座標を検出する入力座標検出回路である。
【００４２】
また、図２は座標入力パネル２０を示す概略的平面図であり、３４はガラス基板、３５はガラス基板３４上に形成された、かつ、抵抗値を周囲電極２２〜２５よりも大きくする抵抗膜である。
【００４３】
ここに、抵抗膜３５は、Ｙ軸方向に延びる垂線及びＸ軸方向に延びる水平線からなる格子状に、かつ、垂線の線幅ＷＶ及び水平線の線幅ＷＨをそれぞれ同一ないし略同一とし、図３及び図４にも示すように、垂線のピッチＰＶ及び水平線のピッチＰＨが中央部にいくに従って大きくなるようにパターニングされている。
【００４４】
この場合、垂線の線幅ＷＶ、水平線の線幅ＷＨ、垂線のピッチＰＶ及び水平線のピッチＰＨは、座標入力ペン３１の先端部３１Ａが必ず抵抗膜３５に接触するように、その大きさが選択され、ＷＶ＝ＷＨとすることもできる。
【００４５】
このようなパターンを有する抵抗膜３５は、ＩＴＯ膜で形成するのであれば、エッチングにより形成でき、カーボン膜で形成するのであれば、スクリーン印刷等により形成することができる。
【００４６】
本発明の座標入力装置の実施の第１の形態においては、入力座標の検出は、駆動電圧印加端子２６、２７に電源電圧ＶＣＣを印加し、駆動電圧印加端子２８、２９に接地電圧０Ｖを印加した場合における座標入力ペン３１の先端部３１Ａが接触している位置の抵抗膜３５上の電圧と、駆動電圧印加端子２７、２９に電源電圧ＶＣＣを印加し、駆動電圧印加端子２６、２８に接地電圧０Ｖを印加した場合における座標入力ペン３１の先端部３１Ａが接触している位置の抵抗膜３５上の電圧とを検出することにより行われる。
【００４７】
図５及び図６は、本発明の座標入力装置の実施の第１の形態の作用、効果を説明するための図であり、図５は、駆動電圧印加端子２６、２７に電源電圧ＶＣＣを印加し、駆動電圧印加端子２８、２９に接地電圧０Ｖを印加した場合に、抵抗膜３５に形成される水平方向の等電位線の一部を示しており、図６は、駆動電圧印加端子２７、２９に電源電圧ＶＣＣを印加し、駆動電圧印加端子２６、２８に接地電圧０Ｖを印加した場合に、抵抗膜３５に形成される垂直方向の等電位線の一部を示している。
【００４８】
図５において、ｉ２６ａは駆動電圧印加端子２６から周囲電極２２に流れ出て、抵抗膜３５を流れ、周囲電極２３を介して駆動電圧印加端子２８に流れ込む電流、ｉ２７ａは駆動電圧印加端子２７から周囲電極２２に流れ出て、抵抗膜３５を流れ、周囲電極２３を介して駆動電圧印加端子２９に流れ込む電流、３７Ａ、３７Ｂ、３７Ｃは抵抗膜３５に形成される水平方向の等電位線の一部を示している。
【００４９】
ここに、本発明の座標入力装置の実施の第１の形態においては、抵抗膜３５は、垂線の線幅ＷＶを同一ないし略同一とし、垂線のピッチＰＶが中央部にいくに従って大きくなるようにパターニングされている。
【００５０】
この結果、抵抗膜３５に流れ込む電流ｉ２６ａのうち、周囲電極２４に近い部分に流れ込む電流の電流値と、中央部分に近い部分に流れ込む電流の電流値との差は、従来例以上に大きくなると共に、抵抗膜３５に流れ込む電流ｉ２７ａのうち、周囲電極２５に近い部分に流れ込む電流の電流値と、中央部分に近い部分に流れ込む電流の電流値との差も、従来例以上に大きくなる。
【００５１】
即ち、電流ｉ２６ａ、ｉ２７ａにより周囲電極２２に発生する駆動電圧印加端子２６、２７側から中央部分にかけての電圧降下は、従来例の場合よりも小さくなると共に、電流ｉ２６ａ、ｉ２７ａにより周囲電極２３に発生する中央部分から駆動電圧印加端子２８、２９側にかけての電圧降下も、従来例の場合よりも小さくなる。
【００５２】
この結果、抵抗膜３５に形成される水平方向の等電位線のうち、周囲電極２２、２３に近い部分の等電位線３７Ａ、３７Ｃを周囲電極２２、２３に平行なものとすることができ、周囲電極２２側から周囲電極２３側にかけて、抵抗膜３５に直線性の良好な電位分布が発生する。
【００５３】
また、図６において、ｉ２７ｂは駆動電圧印加端子２７から周囲電極２５に流れ出て、抵抗膜３５を流れ、周囲電極２４を介して駆動電圧印加端子２６に流れ込む電流、ｉ２９ｂは駆動電圧印加端子２９から周囲電極２５に流れ出て、抵抗膜３５を流れ、周囲電極２４を介して駆動電圧印加端子２８に流れ込む電流、３９Ａ、３９Ｂ、３９Ｃは抵抗膜３５に形成される垂直方向の等電位線の一部を示している。
【００５４】
ここに、本発明の座標入力装置の実施の第１の形態においては、抵抗膜３５は、水平線の線幅ＷＨを同一ないし略同一とし、水平線のピッチＰＨが中央部にいくに従って大きくなるようにパターニングされている。
【００５５】
この結果、抵抗膜３５に流れ込む電流ｉ２７ｂのうち、周囲電極２２に近い部分に流れ込む電流の電流値と、中央部分に近い部分に流れ込む電流の電流値との差は、従来例以上に大きくなると共に、抵抗膜３５に流れ込む電流ｉ２９ｂのうち、周囲電極２３に近い部分に流れ込む電流の電流値と、中央部分に近い部分に流れ込む電流の電流値との差も、従来例以上に大きくなる。
【００５６】
即ち、電流ｉ２７ｂ、ｉ２９ｂにより周囲電極２５に発生する駆動電圧印加端子２７、２９側から中央部分にかけての電圧降下は、従来例の場合よりも小さくなると共に、電流ｉ２７ｂ、ｉ２９ｂにより周囲電極２４に発生する中央部分から駆動電圧印加端子２６、２８側にかけての電圧降下も、従来例の場合よりも小さくなる。
【００５７】
この結果、抵抗膜３５に形成される垂直方向の等電位線のうち、周囲電極２５、２４に近い部分の等電位線３９Ａ、３９Ｃを周囲電極２５、２４に平行なものとすることができ、周囲電極２５側から周囲電極２４側にかけて、抵抗膜３５に直線性の良好な電位分布が発生する。
【００５８】
このように、本発明の座標入力装置の実施の第１の形態によれば、周囲電極２２側から周囲電極２３側にかけて、抵抗膜３５に直線性の良好な電位分布を発生させることができると共に、周囲電極２５側から周囲電極２４側にかけて、抵抗膜３５に直線性の良好な電位分布を発生させることができるので、精度の高い座標入力を行うことができる。
【００５９】
第２の形態・・図７〜図１１
本発明の座標入力装置の実施の第２の形態は、座標入力パネルとして、図７に示す座標入力パネルを備え、その他については、図１に示す本発明の座標入力装置の実施の第１の形態と同様に構成されるものである。
【００６０】
図７中、４１は座標面、４２〜４５は座標面４１の周囲に枠状、かつ、帯状に一体として形成された電位分布発生用電極をなす周囲電極、４６〜４９は駆動電圧が印加される駆動電圧印加端子である。
【００６１】
駆動電圧印加端子４６には電源電圧ＶＣＣ又は接地電圧０Ｖが印加され、駆動電圧印加端子４７には電源電圧ＶＣＣが印加され、駆動電圧印加端子４８には接地電圧０Ｖが印加され、駆動電圧印加端子４９には電源電圧ＶＣＣ又は接地電圧０Ｖが印加される。
【００６２】
また、５０はガラス基板、５１はガラス基板５０上に形成された、かつ、周囲電極４２〜４５よりも抵抗値を大きくする抵抗膜である。
【００６３】
ここに、抵抗膜５１は、Ｙ軸方向に延びる垂線及びＸ軸方向に延びる水平線からなる格子状に、かつ、垂線のピッチＰＶ及び水平線のピッチＰＨをそれぞれ同一ないし略同一とし、図８及び図９にも示すように、垂線及び水平線のうち、周辺部の垂線及び水平線、即ち、周囲電極４２〜４５がそれぞれ長さ方向に重畳されていない垂線の線幅ＷＶ及び水平線の線幅ＷＨがそれぞれ中央部にいくに従って小さくなるようにパターニングされている。
【００６４】
この場合、垂線の線幅ＷＶ、水平線の線幅ＷＨ、垂線のピッチＰＶ及び水平線のピッチＰＨは、座標入力ペン３１の先端部３１Ａが必ず抵抗膜５１に接触するように、その大きさが選択され、ＰＶ＝ＰＨとすることもできる。
【００６５】
このようなパターンを有する抵抗膜５１は、ＩＴＯ膜で形成するのであれば、エッチングにより形成でき、カーボン膜で形成するのであれば、スクリーン印刷等により形成することができる。
【００６６】
本発明の座標入力装置の実施の第２の形態においては、入力座標の検出は、駆動電圧印加端子４６、４７に電源電圧ＶＣＣを印加し、駆動電圧印加端子４８、４９に接地電圧０Ｖを印加した場合における座標入力ペン３１の先端部３１Ａが接触している位置の抵抗膜５１上の電圧と、駆動電圧印加端子４７、４９に電源電圧ＶＣＣを印加し、駆動電圧印加端子４６、４８に接地電圧０Ｖを印加した場合における座標入力ペン３１の先端部３１Ａが接触した位置の抵抗膜５１上の電圧とを検出することにより行われる。
【００６７】
図１０及び図１１は、本発明の座標入力装置の実施の第２の形態の作用、効果を説明するための図であり、図１０は、駆動電圧印加端子４６、４７に電源電圧ＶＣＣを印加し、駆動電圧印加端子４８、４９に接地電圧０Ｖを印加した場合に、抵抗膜５１に形成される水平方向の等電位線の一部を示しており、図１１は、駆動電圧印加端子４７、４９に電源電圧ＶＣＣを印加し、駆動電圧印加端子４６、４８に接地電圧０Ｖを印加した場合に、抵抗膜５１に形成される垂直方向の等電位線の一部を示している。
【００６８】
図１０において、ｉ４６ａは駆動電圧印加端子４６から周囲電極４２に流れ出て、抵抗膜５１を流れ、周囲電極４３を介して駆動電圧印加端子４８に流れ込む電流、ｉ４７ａは駆動電圧印加端子４７から周囲電極４２に流れ出て、抵抗膜５１を流れ、周囲電極４３を介して駆動電圧印加端子４９に流れ込む電流、５３Ａ、５３Ｂ、５３Ｃは抵抗膜５１に形成される水平方向の等電位線の一部を示している。
【００６９】
ここに、本発明の座標入力装置の実施の第２の形態においては、抵抗膜５１は、垂線のピッチＰＶを同一ないし略同一とし、垂線のうち、周辺部の垂線、即ち、周囲電極４４、４５がそれぞれ長さ方向に重畳されていない垂線の線幅ＷＶが中央部にいくに従って小さくなるようにパターニングされている。
【００７０】
この結果、抵抗膜５１に流れ込む電流ｉ４６ａのうち、周囲電極４４に近い部分に流れ込む電流の電流値と、中央部分に近い部分に流れ込む電流の電流値との差は、従来例以上に大きくなると共に、抵抗膜５１に流れ込む電流ｉ４７ａのうち、周囲電極４５に近い部分に流れ込む電流の電流値と、中央部分に近い部分に流れ込む電流の電流値との差も、従来例以上に大きくなる。
【００７１】
即ち、電流ｉ４６ａ、ｉ４７ａにより周囲電極４２に発生する駆動電圧印加端子４６、４７側から中央部分にかけての電圧降下は、従来例の場合よりも小さくなると共に、電流ｉ４６ａ、ｉ４７ａにより周囲電極４３に発生する中央部分から駆動電圧印加端子４８、４９側にかけての電圧降下も、従来例の場合よりも小さくなる。
【００７２】
この結果、抵抗膜５１に形成される水平方向の等電位線のうち、周囲電極４２、４３に近い部分の等電位線５３Ａ、５３Ｃを周囲電極４２、４３に平行なものとすることができ、周囲電極４２側から周囲電極４３側にかけて、抵抗膜５１に直線性の良好な電位分布が発生する。
【００７３】
また、図１１において、ｉ４７ｂは駆動電圧印加端子４７から周囲電極４５に流れ出て、抵抗膜５１を流れ、周囲電極４４を介して駆動電圧印加端子４６に流れ込む電流、ｉ４９ｂは駆動電圧印加端子４９から周囲電極４５に流れ出て、抵抗膜５１を流れ、周囲電極４４を介して駆動電圧印加端子４８に流れ込む電流、５５Ａ、５５Ｂ、５５Ｃは抵抗膜５１に形成される垂直方向の等電位線の一部を示している。
【００７４】
ここに、本発明の座標入力装置の実施の第２の形態においては、抵抗膜５１は、水平線のピッチＰＨを同一ないし略同一とし、水平線のうち、周辺部の水平線、即ち、周囲電極４２、４３が長さ方向に重畳されていない水平線の線幅ＷＨが中央部になるに従って小さくなるようにパターニングされている。
【００７５】
この結果、抵抗膜５１に流れ込む電流ｉ４７ｂのうち、周囲電極４２に近い部分に流れ込む電流の電流値と、中央部分に近い部分に流れ込む電流の電流値との差は、従来例以上に大きくなると共に、抵抗膜５１に流れ込む電流ｉ４９ｂのうち、周囲電極４３に近い部分に流れ込む電流の電流値と、中央部分に近い部分に流れ込む電流の電流値との差も、従来例以上に大きくなる。
【００７６】
即ち、電流ｉ４７ｂ、ｉ４９ｂにより周囲電極４５に発生する駆動電圧印加端子４７、４９側から中央部分にかけての電圧降下は、従来例の場合よりも小さくなると共に、電流ｉ４７ｂ、ｉ４９ｂにより周囲電極４４に発生する中央部分から駆動電圧印加端子４６、４８側にかけての電圧降下も、従来例の場合よりも小さくなる。
【００７７】
この結果、抵抗膜５１に形成される垂直方向の等電位線のうち、周囲電極４５、４４に近い部分の等電位線５５Ａ、５５Ｃを周囲電極４５、４４に平行なものとすることができ、周囲電極４５側から周囲電極４４側にかけて、抵抗膜５１に直線性の良好な電位分布が発生する。
【００７８】
このように、本発明の座標入力装置の実施の第２の形態によれば、周囲電極４２側から周囲電極４３側にかけて、抵抗膜５１に直線性の良好な電位分布を発生させることができると共に、周囲電極４５側から周囲電極４４側にかけて、抵抗膜５１に直線性の良好な電位分布を発生させることができるので、精度の高い座標入力を行うことができる。
【００７９】
第３の形態・・図１２〜図１５
本発明の座標入力装置の実施の第３の形態は、座標入力パネルとして、図１２に示す座標入力パネルを備え、その他については、図１に示す本発明の座標入力装置の実施の第１の形態と同様に構成されるものである。
【００８０】
図１２中、５７はガラス基板上に形成された抵抗膜、５８〜６１は同一形状の三角形からなる電位分布発生用の三角形電極６２を配列してなる周囲電極部である。
【００８１】
ここに、周囲電極部５８〜６１は、抵抗膜５７の周辺部に設けられており、三角形電極６２は、底辺６２Ａを配列方向に平行に、かつ、隣接するもの同士が１８０度回転させた関係になるように一定の間隙をもって帯状に配列されている。
【００８２】
また、６３〜６６は駆動電圧が印加される駆動電圧印加用電極であり、駆動電圧印加用電極６３には電源電圧ＶＣＣ又は接地電圧０Ｖが印加され、駆動電圧印加用電極６４には電源電圧ＶＣＣが印加され、駆動電圧印加用電極６５には接地電圧０Ｖが印加され、駆動電圧印加用電極６６には電源電圧ＶＣＣ又は接地電圧０Ｖが印加される。
【００８３】
本発明の座標入力装置の実施の第３の形態においては、入力座標の検出は、駆動電圧印加用電極６３、６４に電源電圧ＶＣＣを印加し、駆動電圧印加用電極６５、６６に接地電圧０Ｖを印加した場合における座標入力ペン３１の先端部３１Ａが接触している位置の抵抗膜５７上の電圧と、駆動電圧印加用電極６４、６６に電源電圧ＶＣＣを印加し、駆動電圧印加用電極６３、６５に接地電圧０Ｖを印加した場合における座標入力ペン３１の先端部３１Ａが接触している位置の抵抗膜５７上の電圧とを検出することにより行われる。
【００８４】
ここに、図１３は周囲電極部５８を拡大して示す概略的平面図であり、抵抗膜５７のシート抵抗をρ0（Ω／□）、三角形電極６２の斜辺６２Ｂ、６２Ｃの長さをｂ、隣接する三角形電極６２、６２間の斜辺６２Ｂ、６２Ｂ間及び斜辺６２Ｃ、６２Ｃ間の距離、即ち、三角形電極６２、６２間の間隙ａ、三角形電極６２の数をｎとすると、三角形電極６２の抵抗が抵抗膜５７のシート抵抗ρ0より十分小さい場合、周囲電極部５８の抵抗Ｒは、数１に示すようになる。
【００８５】
【数１】

Figure 0003799639
【００８６】
ここに、周囲電極部５８の長さをＬとし、ｂ＞＞ａとすると、ｂは数２に示すように表わすことができるので、周囲電極部５８の抵抗Ｒは、数３に示すように表わすことができる。
【００８７】
【数２】
Figure 0003799639
【００８８】
【数３】
Figure 0003799639
【００８９】
即ち、三角形電極６２を小さくし、三角形電極６２、６２間の間隙ａを小さくする場合には、三角形電極６２、６２間の間隙ａだけで周囲電極部５８の抵抗Ｒを決定することができ、周囲電極部５８を流れる電流による電圧降下を小さくすることができる。周囲電極部５９〜６１についても同様である。
【００９０】
この結果、周囲電極部５８、５９に近い部分の水平方向の等電位線を周囲電極部５８、５９に平行なものとすることができると共に、周囲電極部６１、６０に近い部分の垂直方向の等電位線を周囲電極部６１、６０に平行なものとすることができる。
【００９１】
したがって、本発明の座標入力装置の実施の第３の形態によれば、周囲電極部５８側から周囲電極部５９側にかけて、抵抗膜５７に直線性の良好な電位分布を発生させることができると共に、周囲電極部６１側から周囲電極部６０側にかけて、抵抗膜５７に直線性の良好な電位分布を発生させることができるので、精度の高い座標入力を行うことができる。
【００９２】
なお、図１４に、たとえば、抵抗膜５７の水平方向の位置と、三角形電極６２、６２間の間隙ａとの関係を示すように、周囲電極部５８〜６１において、三角形電極６２、６２間の間隙ａを中央部にいくに従って小さくなるようにする場合には、本発明の座標入力装置の実施の第３の形態よりも周囲電極部５８〜６１における電圧降下を小さくすることができ、抵抗膜５７に、より直線性の良い等電位線を形成することができる。
【００９３】
また、図１５に、たとえば、抵抗膜５７の水平方向の位置と、三角形電極６２の斜辺６２Ｂ、６２Ｃの長さｂとの関係を示すように、周囲電極部５８〜６１において、三角形電極６２の斜辺６２Ｂ、６２Ｃの長さｂを中央部に行くに従って大きくなるようにする場合には、本発明の座標入力装置の実施の第３の形態よりも周囲電極部５８〜６１における電圧降下を小さくすることができ、抵抗膜５７に、より直線性の良い等電位線を形成することができる。
【００９４】
第４の形態・・図１６
図１６は本発明の座標入力装置の実施の第４の形態の要部を概略的に示す図である。図１６中、６８は座標入力パネルであり、６９はガラス基板上に形成された抵抗膜、７０〜７３は抵抗膜６９上の周囲に枠状、かつ、帯状に一体として形成された電位分布発生用電極をなす抵抗膜６９よりも低抵抗の周囲電極である。
【００９５】
また、７４〜７７は駆動電圧が印加される駆動電圧印加端子であり、駆動電圧印加端子７４には電源電圧ＶＣＣ又は接地電圧０Ｖが印加され、駆動電圧印加端子７５には電源電圧ＶＣＣが印加され、駆動電圧印加端子７６には接地電圧０Ｖが印加され、駆動電圧印加端子７７には電源電圧ＶＣＣ又は接地電圧０Ｖが印加される。
【００９６】
また、７８は周囲電極７０の中央部の電圧をモニタするために周囲電極７０の中央部に設けられたモニタ電極、７９は周囲電極７１の中央部の電圧をモニタするために周囲電極７１の中央部に設けられたモニタ電極である。
【００９７】
また、８０は周囲電極７２の中央部の電圧をモニタするために周囲電極７２の中央部に設けられたモニタ電極、８１は周囲電極７３の中央部の電圧をモニタするために周囲電極７３の中央部に設けられたモニタ電極である。
【００９８】
また、８２は駆動電圧印加端子７４、７７に電源電圧ＶＣＣ又は接地電圧０Ｖを印加するためのスイッチ回路であり、このスイッチ回路８２は、駆動電圧印加端子７４に電源電圧ＶＣＣを印加する場合には、駆動電圧印加端子７７に接地電圧０Ｖを印加し、駆動電圧印加端子７４に接地電圧０Ｖを印加する場合には、駆動電圧印加端子７７に電源電圧ＶＣＣを印加するように制御される。
【００９９】
また、８３は先端部８３Ａを抵抗膜６９に接触させることにより座標入力を行う座標入力ペン、８４は座標入力ペン８３の先端部８３Ａが接触した抵抗膜６９上の座標を検出する入力座標検出回路であり、８５はモニタ電極７８〜８１を介して周囲電極７０〜７３の中央部の電圧を検出する電圧検出回路である。
【０１００】
ここに、入力座標検出回路８４は、スイッチ制御信号によりスイッチ回路８２を制御すると共に、座標入力ペン８３の先端部８３Ａが接触した抵抗膜６９上の電圧と、電圧検出回路８５で検出される周囲電極７０〜７３の中央部の電圧とから、電位分布の非直線性を考慮し、座標入力ペン８３の先端部８３Ａが実際に接触した抵抗膜６９上の座標を検出するように構成されている。
【０１０１】
本発明の座標入力装置の実施の第４の形態においては、入力座標の検出は、駆動電圧印加端子７４、７５に電源電圧ＶＣＣを印加し、駆動電圧印加端子７６、７７に接地電圧０Ｖを印加した場合における座標入力ペン８３の先端部８３Ａが接触している位置の抵抗膜６９上の電圧と、駆動電圧印加端子７５、７７に電源電圧ＶＣＣを印加し、駆動電圧印加端子７４、７６に接地電圧０Ｖを印加した場合における座標入力ペン８３の先端部８３Ａが接触している位置の抵抗膜６９上の電圧とを検出することにより行われる。
【０１０２】
ここに、入力座標検出回路８４においては、座標入力ペン８３の先端部８３Ａが接触した抵抗膜６９上の電圧と、電圧検出回路８５で検出される周囲電極７０〜７３の中央部の電圧とから、電位分布の非直線性を考慮し、座標入力ペン８３の先端部８３Ａが実際に接触した抵抗膜６９上の座標が検出される。
【０１０３】
したがって、本発明の座標入力装置の実施の第４の形態によれば、抵抗膜６９に生じる電位分布に直線性がない場合であっても、精度の高い座標入力を行うことができる。
【０１０４】
第５の形態・・図１７
図１７は本発明の座標入力装置の実施の第５の形態の要部を概略的に示す図であり、本発明の座標入力装置の実施の第５の形態は、図１６に示すようなモニタ電極７８〜８１を形成せず、駆動電圧印加端子７４〜７７の電圧をモニタし、入力座標検出回路８４において、座標入力ペン８３の先端部８３Ａが接触した抵抗膜６９上の電圧と、電圧検出回路８５で検出される駆動電圧印加端子７４〜７７の電圧とから、電位分布の非直線性を考慮し、座標入力ペン８３の先端部８３Ａが実際に接触した抵抗膜６９上の座標を検出するように構成されており、その他については、図１６に示す本発明の座標入力装置の実施の第４の形態と同様に構成されている。
【０１０５】
本発明の座標入力装置の実施の第５の形態においても、入力座標の検出は、駆動電圧印加端子７４、７５に電源電圧ＶＣＣを印加し、駆動電圧印加端子７６、７７に接地電圧０Ｖを印加した場合における座標入力ペン８３の先端部８３Ａが接触している位置の抵抗膜６９上の電圧と、駆動電圧印加端子７５、７７に電源電圧ＶＣＣを印加し、駆動電圧印加端子７４、７６に接地電圧０Ｖを印加した場合における座標入力ペン８３の先端部８３Ａが接触している位置の抵抗膜６９上の電圧とを検出することにより行われる。
【０１０６】
ここに、入力座標検出回路８４においては、座標入力ペン８３の先端部８３Ａが接触した抵抗膜６９上の電圧と、電圧検出回路８５で検出される駆動電圧印加端子７４〜７７の電圧とから、電位分布の非直線性を考慮し、座標入力ペン８３の先端部８３Ａが実際に接触した抵抗膜６９上の座標が検出される。
【０１０７】
したがって、本発明の座標入力装置の実施の第５の形態によっても、本発明の座標入力装置の実施の第４の形態と同様に、抵抗膜６９に生じる電位分布に直線性がない場合であっても、精度の高い座標入力を行うことができる。
【０１０８】
第６の形態・・図１８
本発明の座標入力装置の実施の第６の形態は、座標入力パネルとして、図１８に示す座標入力パネルを備え、その他については、図１６に示す本発明の座標入力装置の実施の第４の形態と同様に構成されるものである。
【０１０９】
この座標入力パネルは、図１６に示すモニタ電極７８、７９、８０、８１の代わりに、平面形状をＴ字状とし、かつ、先端部８６Ａ、８７Ａ、８８Ａ、８９Ａを抵抗膜６９上に突出させ、かつ、抵抗膜６９に接触させた周囲電極７０〜７３よりも低抵抗のモニタ電極８６、８７、８８、８９を設け、その他については、図１６に示す座標入力パネル６８と同様に構成したものである。
【０１１０】
本発明の座標入力装置の実施の第６の形態においても、入力座標の検出は、駆動電圧印加端子７４、７５に電源電圧ＶＣＣを印加し、駆動電圧印加端子７６、７７に接地電圧０Ｖを印加した場合における座標入力ペン８３の先端部８３Ａが接触している位置の抵抗膜６９上の電圧と、駆動電圧印加端子７５、７７に電源電圧ＶＣＣを印加し、駆動電圧印加端子７４、７６に接地電圧０Ｖを印加した場合における座標入力ペン８３の先端部８３Ａが接触している位置の抵抗膜６９上の電圧とを検出することにより行われる。
【０１１１】
ここに、９０Ａ、９０Ｂ、９０Ｃは、駆動電圧印加端子７４、７５に電源電圧ＶＣＣを印加し、駆動電圧印加端子７６、７７に接地電圧０Ｖを印加した場合に発生する水平方向の等電位線の一部を示している。
【０１１２】
このように、本発明の座標入力装置の実施の第６の形態においては、周囲電極７０、７１よりも低抵抗のモニタ電極８６、８７の先端部８６Ａ、８７Ａを抵抗膜６９上に突出させ、かつ、抵抗膜６９に接触させているので、周囲電極７０、７１の近くに形成される水平方向の等電位線９０Ａ、９０Ｃの湾曲を緩和することができる。
【０１１３】
また、周囲電極７２、７３よりも低抵抗のモニタ電極８８、８９の先端部８８Ａ、８９Ａを抵抗膜６９上に突出させ、かつ、抵抗膜６９に接触させているので、駆動電圧印加端子７５、７７に電源電圧ＶＣＣを印加し、駆動電圧印加端子７４、７６に接地電圧０Ｖを印加した場合に、周囲電極７２、７３の近くに発生する垂直方向の等電位線の湾曲を緩和することができる。
【０１１４】
そして、また、本発明の座標入力装置の実施の第６の形態によっても、入力座標検出回路８４においては、座標入力ペン８３の先端部８３Ａが接触した抵抗膜６９上の電圧と、電圧検出回路８５で検出される周囲電極７０〜７３の中央部の電圧とから、電位分布の非直線性を考慮し、座標入力ペン８３の先端部８３Ａが実際に接触した抵抗膜６９上の座標が検出される。
【０１１５】
したがって、本発明の座標入力装置の実施の第６の形態によっても、本発明の座標入力装置の実施の第４の形態と同様に、抵抗膜６９に生じる電位分布に直線性がない場合であっても、精度の高い座標入力を行うことができる。
【０１１６】
第７の形態・・図１９、図２０
図１９は本発明の座標入力装置の実施の第７の形態の要部を概略的に示す図であり、本発明の座標入力装置の実施の第７の形態においては、入力座標検出回路として、モニタ電極７８〜８１によりモニタされる電圧を検出する電圧検出回路を有しない図１に示す入力座標検出回路３２が設けられていると共に、モニタ電極７８〜８１は、それぞれ、電圧検出・駆動電圧発生回路９１〜９４に接続されており、その他については、図１６に示す本発明の座標入力装置の実施の第４の形態と同様に構成されている。
【０１１７】
ここに、電圧検出・駆動電圧発生回路９１〜９４は、モニタ電極７８〜８１によりモニタされる電圧を検出して、電位分布の非直線性を判定して、電位分布を直線性の良好なものとするための駆動電圧をモニタ電極７８〜８１に印加するものである。
【０１１８】
これら電圧検出・駆動電圧発生回路９１〜９４は同一の回路構成とされており、図２０は電圧検出・駆動電圧発生回路９１の構成を示しており、９６はモニタ電極７８によりモニタされる周囲電極７０の中央部の電圧を検出する電圧検出回路、９７は電圧検出回路９６により検出された電圧に基づいて、抵抗膜６９の電位分布を直線性の良好なものとするために、モニタ電極７８に印加すべき駆動電圧を示す電圧情報を出力する演算回路、９８は演算回路９７から出力される電圧情報に基づいてモニタ電極７８に印加すべき駆動電圧を出力する駆動電圧発生回路である。
【０１１９】
本発明の座標入力装置の実施の第７の形態においては、入力座標の検出は、駆動電圧印加端子７４、７５に電源電圧ＶＣＣを印加し、駆動電圧印加端子７６、７７に接地電圧０Ｖを印加した場合における座標入力ペン８３の先端部８３Ａが接触している位置の抵抗膜６９上の電圧と、駆動電圧印加端子７５、７７に電源電圧ＶＣＣを印加し、駆動電圧印加端子７４、７６に接地電圧０Ｖを印加した場合における座標入力ペン８３の先端部８３Ａが接触している位置の抵抗膜６９上の電圧とを検出することにより行われる。
【０１２０】
ここに、電圧検出・駆動電圧発生回路９１〜９４は、モニタ電極７８〜８１によりモニタされる周囲電極７０〜７３の中央部の電圧に基づいて、抵抗膜６９の電位分布を直線性の良好なものとするための駆動電圧をモニタ電極７８〜８１に印加する。
【０１２１】
したがって、本発明の座標入力装置の実施の第７の形態によれば、抵抗膜６９に直線性の良好な電位分布を発生させることができ、精度の高い座標入力を行うことができる。
【０１２２】
なお、座標入力パネル６８の代わりに、図１８に示す座標入力パネルを使用するようにしても良い。
【０１２３】
第８の形態・・図２１
図２１は本発明の座標入力装置の実施の第８の形態の要部を概略的に示す図である。図２１中、１００は座標入力パネルであり、この座標入力パネル１００は、図１６に示す座標入力パネル６８と、この座標入力パネル上に一定の間隔を有するように設けられた電圧検出用導電膜１０２とで構成されている。
【０１２４】
また、１０３は座標入力ペンであり、この座標入力ペン１０３は、座標入力時、その先端部１０３Ａで電圧検出用導電膜１０２の入力座標に対応する位置を加圧して、電圧検出用導電膜１０２の入力座標に対応する位置の抵抗膜６９との対向部分を抵抗膜６９に接触させるように使用される。
【０１２５】
また、１０４は座標入力パネル６８の駆動電圧印加端子７４〜７７に駆動電圧を印加するスイッチ回路であり、このスイッチ回路１０４は、電圧検出用導電膜１０２が抵抗膜に接触する前は、駆動電圧印加端子７４〜７７に接地電圧０Ｖを印加し、電圧検出用導電膜１０２が抵抗膜に接触すると、駆動電圧印加端子７４に電源電圧ＶＣＣ及び接地電圧０Ｖを交互に印加し、駆動電圧印加端子７５に電源電圧ＶＣＣを印加し、駆動電圧印加端子７６に接地電圧０Ｖを印加し、駆動電圧印加端子７７に接地電圧０Ｖ及び電源電圧ＶＣＣを交互に印加するように制御される。
【０１２６】
また、１０５は電圧検出用導電膜１０２に接続された配線、１０６は座標入力ペン１０３により入力された座標の検出を行う入力座標検出回路である。
【０１２７】
この入力座標検出回路１０６において、１０７は電流が流れるか否かを検出することにより、電圧検出用導電膜１０２が抵抗膜６９に接触したか否かを検出する電圧検出用導電膜接触検出手段をなすタッチ検出回路であり、１０８は比較器、１０９はリファレンス（基準）電源、１１０、１１１は抵抗、１１２は接続スイッチ素子である。
【０１２８】
また、１１３は電圧検出用導電膜１０２を介して検出される抵抗膜６９上の電圧をデジタル信号に変換するＡ／Ｄコンバータ（アナログ・デジタル・コンバータ）、１１４はスイッチ制御信号ＳＡによるスイッチ回路１０４の制御、スイッチ制御信号ＳＢによる接続スイッチ素子１１２の制御及びＡ／Ｄコンバータ１１３の出力から入力座標の検出等を行うＭＣＵ（マイクロ・コントローラ・ユニット）である。
【０１２９】
ここに、本発明の座標入力装置の実施の第８の形態においては、電圧検出用導電膜１０２が抵抗膜６９に接触する前は、スイッチ回路１０４により駆動電圧印加端子７４〜７７に接地電圧０Ｖが印加されると共に、接続スイッチ素子１１２は導通状態とされる。
【０１３０】
そして、座標入力ペン１０３の先端部１０３Ａが電圧検出用導電膜１０２を加圧して、電圧検出用導電膜１０２の加圧点が抵抗膜６９に接触すると、ＶＣＣ電源から抵抗１１０、接続スイッチ素子１１２、抵抗１１１、電圧検出用導電膜１０２、抵抗膜６９及び駆動電圧印加端子７４〜７７を介して接地側に電流が流れ、抵抗１１１間に電位差が生じ、これが比較器１０８により検出され、この比較器１０８からＭＣＵ１１４に対して、電圧検出用導電膜１０２が抵抗膜６９に接触した旨の情報が与えられる。
【０１３１】
すると、ＭＣＵ１１４は、接続スイッチ素子１１２を非導通状態にすると共に、スイッチ回路１０４を制御して、駆動電圧印加端子７４に電源電圧ＶＣＣ及び接地電圧０Ｖを交互に印加させ、駆動電圧印加端子７５に電源電圧ＶＣＣを印加させ、駆動電圧印加端子７６に接地電圧０Ｖを印加させ、駆動電圧印加端子７７に接地電圧０Ｖ及び電源電圧ＶＣＣを交互に印加させる。
【０１３２】
この結果、電圧検出用導電膜１０２が接触している位置の抵抗膜６９上の電圧がＡ／Ｄコンバータ１１３に入力され、Ａ／Ｄコンバータ１１３は、これをデジタル化してＭＣＵ１１４に与え、ＭＣＵ１１４は、入力されたデジタル化された抵抗膜６９上の電圧に基づいて入力座標を検出する。
【０１３３】
このように、本発明の座標入力装置の実施の第８の形態によれば、電圧検出用導電膜１０２が抵抗膜６９に接触したか否かの検出は、抵抗１１１に電圧降下が発生するか否か、即ち、抵抗１１１に電流が流れるか否かにより検出するとしているので、接触抵抗が変化する場合においても、電圧検出用導電膜１０２が抵抗膜６９に接触したか否かの検出を確実に行うことができ、入力座標の検出を確実に行うことができる。
【０１３４】
なお、本発明の座標入力装置の実施の第８の形態においては、座標入力パネルとして、図１６に示す座標入力パネル６８を使用した場合について説明したが、この代わりに、図１及び図２に示す座標入力パネル２０や、図７に示す座標入力パネルや、図１２に示す座標入力パネルや、図１８に示す座標入力パネル等を使用することができるものである。
【０１３５】
第９の形態・・図２２
図２２は本発明の座標入力装置の実施の第９の形態の要部を概略的に示す図であり、本発明の座標入力装置の実施の第９の形態は、図２１に示す入力座標検出回路１０６と回路構成の異なる入力座標検出回路１１６を設け、その他については、図２１に示す本発明の座標入力装置の実施の第８の形態と同様に構成したものである。
【０１３６】
ここに、入力座標検出回路１１６は、図２１に示すタッチ検出回路１０７と回路構成の異なるタッチ検出回路１１７を設け、その他については、図２１に示す入力座標検出回路１０６と同様に構成したものである。
【０１３７】
タッチ検出回路１１７において、１１８、１１９は抵抗、１２０はＭＣＵ１１４からのスイッチ制御信号ＳＢにより導通、非導通が制御される接続スイッチ素子をなすＰＮＰトランジスタ、１２１は抵抗１１８の電位差を検出するＰＮＰトランジスタである。
【０１３８】
本発明の座標入力装置の実施の第９の形態においては、電圧検出用導電膜１０２が抵抗膜６９に接触する前は、スイッチ回路１０４により駆動電圧印加端子７４〜７６に接地電圧０Ｖが印加されると共に、ＰＮＰトランジスタ１２０は導通状態とされる。
【０１３９】
そして、座標入力ペン１０３の先端部１０３Ａが電圧検出用導電膜１０２を加圧して、電圧検出用導電膜１０２の加圧点が抵抗膜６９に接触すると、ＶＣＣ電源からＰＮＰトランジスタ１２０、抵抗１１８、電圧検出用導電膜１０２、抵抗膜６９及び駆動電圧印加端子７４〜７７を介して接地側に電流が流れ、抵抗１１８間に電位差が生じ、ＰＮＰトランジスタ１２１により検出され、このＰＮＰトランジスタ１２１からＭＣＵ１１４に対して、電圧検出用導電膜１０２が抵抗膜６９に接触した旨の情報が与えられる。
【０１４０】
すると、ＭＣＵ１１４は、ＰＮＰトランジスタ１２０を非導通状態とすると共に、スイッチ制御信号ＳＡによりスイッチ回路１０４を制御して、駆動電圧印加端子７４に電源電圧ＶＣＣ及び接地電圧０Ｖを交互に印加させ、駆動電圧印加端子７５に電源電圧ＶＣＣを印加させ、駆動電圧印加端子７６に接地電圧０Ｖを印加させ、駆動電圧印加端子７７に接地電圧０Ｖ及び電源電圧ＶＣＣを交互に印加させる。
【０１４１】
この結果、電圧検出用導電膜１０２が接触している位置の抵抗膜６９上の電圧がＡ／Ｄコンバータ１１３に入力され、Ａ／Ｄコンバータ１１３は、これをデジタル化してＭＣＵ１１４に与え、ＭＣＵ１１４は、入力されたデジタル化された抵抗膜６９上の電圧に基づいて入力座標を検出する。
【０１４２】
このように、本発明の座標入力装置の実施の第９の形態によれば、電圧検出用導電膜１０２が抵抗膜６９に接触したか否かの検出は、抵抗１１８に電圧降下が発生するか否か、即ち、抵抗１１８に電流が流れるか否かにより検出するとしているので、接触抵抗が変化する場合においても、電圧検出用導電膜１０２が抵抗膜６９に接触したか否かの検出を確実に行うことができ、入力座標の検出を確実に行うことができる。
【０１４３】
なお、本発明の座標入力装置の実施の第９の形態においては、座標入力パネルとして、図１６に示す座標入力パネル６８を使用した場合について説明したが、この代わりに、図１及び図２に示す座標入力パネル２０や、図７に示す座標入力パネルや、図１２に示す座標入力パネルや、図１８に示す座標入力パネル等を使用することができるものである。
【０１４４】
【発明の効果】
以上のように、本発明中、第１の発明及び第２の発明の座標入力装置によれば、電位分布発生用電極における電圧降下を小さくし、電位分布発生用電極の近くに形成される等電位線の直線性を高め、抵抗膜に直線性の良好な電位分布を発生させることができるので、精度の高い座標入力を行うことができる。
【０１４５】
また、第３の発明の座標入力装置によれば、電位分布発生用電極を配列している部分の電圧降下を小さくし、電位分布発生用電極を配列している部分の近くに形成される等電位線の直線性を高め、抵抗膜に直線性の良好な電位分布を発生させることができるので、精度の高い座標入力を行うことができる。
【０１４６】
また、第４の発明の座標入力装置によれば、抵抗膜に発生する電位分布の非線形性を考慮し、実際に入力された座標の検出を行うことができるので、抵抗膜に発生する電位分布に直線性がない場合であっても、精度の高い座標入力を行うことができる。
【０１４７】
また、第５の発明の座標入力装置によれば、電圧検出・駆動電圧発生手段により、電位分布発生用電極の近くに形成される等電位線の直線性を高め、抵抗膜に直線性の良好な電位分布を発生させることができるので、精度の高い座標入力を行うことができる。
【０１４８】
また、第１の発明から第５の発明において、抵抗膜に対して一定の間隔をもって電圧検出用導電膜を対向させ、入力座標の選択は、電圧検出用導電膜の入力座標に対応する位置の抵抗膜との対向部分を抵抗膜に接触させることにより行い、入力座標の検出は、抵抗膜上、電圧検出用導電膜を介して入力座標として選択された位置の電圧を検出することにより行うように構成すると共に、電圧検出用導電膜が抵抗膜に接触した場合に、電圧検出用導電膜側から抵抗膜側に電流を流し、この電流を検出することにより、電圧検出用導電膜が抵抗膜に接触したことを検出する電圧検出用導電膜接触検出手段と、この電圧検出用導電膜接触検出手段により電圧検出用導電膜が抵抗膜に接触したことが検出された場合に、駆動電圧を座標入力パネルに供給する駆動電圧供給手段とを備えるようにした場合には、接触抵抗が変化した場合においても、電圧検出用導電膜が抵抗膜に接触したか否かの検出を確実に行うことができ、入力座標の検出を確実に行うことができる。
【図面の簡単な説明】
【図１】本発明の座標入力装置の実施の第１の形態の要部を概略的に示す図である。
【図２】本発明の座標入力装置の実施の第１の形態が備える座標入力パネルを示す概略的平面図である。
【図３】本発明の座標入力装置の実施の第１の形態が備える座標入力パネルの座標面の水平方向の位置と、抵抗膜の垂線のピッチとの関係を示す図である。
【図４】本発明の座標入力装置の実施の第１の形態が備える座標入力パネルの座標面の垂直方向の位置と、抵抗膜の水平線のピッチとの関係を示す図である。
【図５】本発明の座標入力装置の実施の第１の形態の作用、効果を説明するための図である。
【図６】本発明の座標入力装置の実施の第１の形態の作用、効果を説明するための図である。
【図７】本発明の座標入力装置の実施の第２の形態が備える座標入力パネルを示す概略的平面図である。
【図８】図７に示す座標入力パネルの座標面上、抵抗膜の垂線の水平方向の位置と、抵抗膜の垂線の線幅との関係を示す図である。
【図９】図７に示す座標入力パネルの座標面上、抵抗膜の水平線の垂直方向の位置と、抵抗膜の水平線の線幅との関係を示す図である。
【図１０】本発明の座標入力装置の実施の第２の形態の作用、効果を説明するための図である。
【図１１】本発明の座標入力装置の実施の第２の形態の作用、効果を説明するための図である。
【図１２】本発明の座標入力装置の実施の第３の形態が備える座標入力パネルを示す概略的平面図である。
【図１３】本発明の座標入力装置の実施の第３の形態が備える座標入力パネルの周囲電極部を示す概略的平面図である。
【図１４】本発明の座標入力装置の実施の第３の形態が備える座標入力パネルにおける抵抗膜の水平方向の位置と、三角形電極間の間隙との関係を示す図である。
【図１５】本発明の座標入力装置の実施の第３の形態が備える座標入力パネルにおける抵抗膜の水平方向の位置と、三角形電極の斜辺の長さとの関係を示す図である。
【図１６】本発明の座標入力装置の実施の第４の形態の要部を概略的に示す図である。
【図１７】本発明の座標入力装置の実施の第５の形態の要部を概略的に示す図である。
【図１８】本発明の座標入力装置の実施の第６の形態が備える座標入力パネルを示す概略的平面図である。
【図１９】本発明の座標入力装置の実施の第７の形態の要部を概略的に示す図である。
【図２０】本発明の座標入力装置の実施の第７の形態が備える電圧検出・駆動電圧発生回路の構成を示す回路図である。
【図２１】本発明の座標入力装置の実施の第８の形態の要部を概略的に示す図である。
【図２２】本発明の座標入力装置の実施の第９の形態の要部を概略的に示す図である。
【図２３】従来の座標入力装置の一例の要部を概略的に示す図である。
【図２４】図２３に示す従来の座標入力装置が有する問題点を説明するための図である。
【図２５】図２３に示す従来の座標入力装置が有する問題点を説明するための図である。
【図２６】座標入力パネルの抵抗膜に発生させる電位分布の直線性を高めるものとして提案されている従来の方法の一例を説明するための図である。
【符号の説明】
２２〜２５ 周囲電極
２６〜２９ 駆動電圧印加端子
３１ 座標入力ペン[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a coordinate input device used as an input device for a computer.
[0002]
[Prior art]
Conventionally, as this type of coordinate input device, a device whose outline is schematically shown in FIG. 23 has been proposed (see Japanese Patent Application Laid-Open No. 47-36923).
[0003]
In FIG. 23, 1 is a coordinate input panel for inputting coordinates, 2 is a resistance film forming a coordinate surface formed on the substrate, and 3 to 6 are peripheral electrodes whose resistance value is smaller than that of the resistance film 2 , 7 to 10 are drive voltage application terminals to which a drive voltage is applied.
[0004]
Reference numeral 11 denotes a drive circuit that applies a drive voltage to the drive voltage application terminals 7 to 10, reference numeral 12 denotes a coordinate input pen that inputs coordinates by pressing the tip 12A against the resistive film 2, and reference numeral 13 denotes a coordinate input pen. 12 is an input coordinate detection circuit that detects coordinates on the resistive film 2 in contact with 12 tip portions 12A.
[0005]
In this coordinate input device, the tip 12A of the coordinate input pen 12 is in contact when the power supply voltage VCC is applied to the drive voltage application terminals 7 and 8 and the ground voltage 0V is applied to the drive voltage application terminals 9 and 10. The tip 12A of the coordinate input pen 12 when the voltage on the resistance film 2 at the position, the power supply voltage VCC is applied to the drive voltage application terminals 8 and 10 and the ground voltage 0 V is applied to the drive voltage application terminals 7 and 9 The input coordinates are detected by detecting the voltage on the resistive film 2 at the position of contact.
[0006]
FIGS. 24 and 25 are diagrams for explaining the problems of the coordinate input device. FIG. 24 applies the power supply voltage VCC to the drive voltage application terminals 7 and 8 and applies them to the drive voltage application terminals 9 and 10. FIG. 25 shows a part of the horizontal equipotential line formed in the resistance film 2 when the ground voltage 0 V is applied. FIG. 25 shows the case where the power supply voltage VCC is applied to the drive voltage application terminals 8 and 10 and the drive voltage is applied. A part of vertical equipotential lines formed in the resistance film 2 when a ground voltage of 0 V is applied to the application terminals 7 and 9 is shown.
[0007]
In FIG. 24, i7a flows out from the drive voltage application terminal 7 to the peripheral electrode 3, flows through the resistance film 2, and flows into the drive voltage application terminal 9 through the peripheral electrode 4, and i8a represents from the drive voltage application terminal 8 to the peripheral electrode. , 14A, 14B, and 14C flow out of the resistive film 2 and flow into the drive voltage application terminal 10 via the peripheral electrode 4, and show part of equipotential lines formed in the resistive film 2.
[0008]
Here, as shown in FIG. 24, when the power supply voltage VCC is applied to the drive voltage application terminals 7 and 8, and the ground voltage 0V is applied to the drive voltage application terminals 9 and 10, currents i7a and i8a flowing through the peripheral electrodes 3 are applied. As a result, a large voltage drop occurs in the peripheral electrode 3 from the drive voltage application terminals 7 and 8 to the central portion, and the current i7a and i8a flowing in the peripheral electrode 4 causes the peripheral electrode 4 to be driven from the central portion. A large voltage drop occurs on the voltage application terminals 9 and 10 side.
[0009]
For this reason, among the equipotential lines in the horizontal direction formed in the resistance film 2, the equipotential lines 14A and 14C near the surrounding electrodes 3 and 4 are not parallel to the surrounding electrodes 3 and 4, but are curved. As a result, a potential distribution with poor linearity is generated in the resistance film 2 from the peripheral electrode 3 side to the peripheral electrode 4 side.
[0010]
In FIG. 25, i8b flows out from the drive voltage application terminal 8 to the peripheral electrode 6, flows through the resistance film 2, and flows into the drive voltage application terminal 7 through the peripheral electrode 5, and i10b denotes the drive voltage application terminal 10. , 15A, 15B, and 15C indicate a part of equipotential lines formed in the resistance film 2, flowing out of the resistance electrode 2 and flowing into the drive voltage application terminal 9 via the peripheral electrode 5. ing.
[0011]
Here, as shown in FIG. 25, when the power supply voltage VCC is applied to the drive voltage application terminals 8 and 10 and the drive voltage application terminals 7 and 9 are grounded, the currents i8b and i10b flowing through the peripheral electrodes 6 6 has a large voltage drop from the drive voltage application terminals 8 and 10 to the central portion, and currents i8b and i10b flowing through the peripheral electrode 5 cause the peripheral electrode 5 to have a drive voltage application terminal 7 from the central portion. , A large voltage drop occurs on the 9 side.
[0012]
For this reason, among the equipotential lines in the vertical direction formed in the resistance film 2, the equipotential lines 15A and 15C near the surrounding electrodes 6 and 5 are not parallel to the surrounding electrodes 6 and 5, but are curved. As a result, a potential distribution with poor linearity is generated in the resistance film 2 from the peripheral electrode 6 side to the peripheral electrode 5 side.
[0013]
As described above, this coordinate input device has a problem in that it cannot generate a potential distribution with excellent linearity in the resistance film 2 and cannot perform highly accurate coordinate input.
[0014]
Therefore, conventionally, as shown in FIG. 26, the planar shape of the peripheral electrodes 3 to 6 is made parabolic, so that the linearity of the equipotential lines near the peripheral electrodes 3 to 6 of the resistance film 2 is improved. A method of generating a potential distribution with good linearity in the resistance film 2 has been proposed (see Japanese Laid-Open Patent Publication No. 47-36923).
[0015]
[Problems to be solved by the invention]
However, when the planar shape of the peripheral electrodes 3 to 6 is changed to a parabolic shape as described above, there is a problem in that a region on the resistance film 2 where coordinates can be input is narrowed.
[0016]
Here, when the surface resistance ratio between the resistance film 2 and the surrounding electrodes 3 to 6 is increased, the curvature of the surrounding electrodes 3 to 6 can be reduced. There has been a problem that the resistance values of the peripheral electrodes 3 to 6 are reduced and the current consumption is increased.
[0017]
Conventionally, the voltage detection conductive film is opposed to the resistance film 2 at a constant interval, and the input of coordinates is performed by adding a portion facing the resistance film 2 at a position corresponding to the input coordinates of the voltage detection conductive film. The input coordinate is detected by detecting the voltage at the position selected as the input coordinate on the resistance film 2 via the voltage detection conductive film. A coordinate input device has been proposed (see Japanese Patent Laid-Open No. 6-187083).
[0018]
In this coordinate input device, when it is detected that the voltage detection conductive film is in contact with the resistance film 2, a drive voltage for alternately generating a potential distribution in the orthogonal direction is applied to the resistance film 2. Applied to terminals 7-10.
[0019]
Here, whether or not the voltage detection conductive film is in contact with the resistance film 2 is applied by applying a constant voltage to the voltage detection conductive film and applying a ground voltage of 0 V to the drive voltage application terminals 7 to 10. The voltage detection conductive film is detected by detecting the voltage of the voltage detection conductive film when the voltage detection conductive film contacts the resistance film 2.
[0020]
However, in the case of the method for detecting the voltage of the voltage detection conductive film as described above, when the contact resistance changes, the detection voltage changes, and the voltage detection conductive film contacts the resistance film 2. However, there is a problem in that this cannot be detected and the input coordinates cannot be detected.
[0021]
  In view of this point, the present inventionProvided is a coordinate input device capable of performing highly accurate coordinate input.For the purpose.
[0022]
[Means for Solving the Problems]
  The present invention provides a first invention to a first invention.5The first invention to the first invention are included.5The coordinate input device of the present invention is a rectangular substrate, a resistance film formed on the substrate, and a frame shape formed on the periphery of the resistance film to alternately generate orthogonal potential distributions on the resistance film. A voltage distribution generating electrode to which driving voltages for applying the voltage are applied to the four corners, a coordinate input panel having a predetermined region of the resistive film as an orthogonal coordinate plane, and a position selected as an input coordinate on the resistive film The coordinate input device that detects the input coordinates by detecting the voltage is improved.
[0023]
In the coordinate input device according to the first aspect of the present invention, the resistive film has a lattice shape composed of a vertical line extending in the Y-axis (vertical axis) direction and a horizontal line extending in the X-axis (horizontal axis) direction, and the line width of the vertical line and the horizontal line. Are the same or substantially the same, and the vertical and horizontal pitches are patterned so as to increase toward the center.
[0024]
According to the coordinate input device of the first aspect of the invention, the voltage drop in the potential distribution generating electrode is reduced, the linearity of the equipotential lines formed near the potential distribution generating electrode is increased, and the resistance film is linear. It is possible to generate a good potential distribution.
[0025]
In the coordinate input device according to the second aspect of the invention, the resistance film has a lattice shape composed of a vertical line extending in the Y-axis direction and a horizontal line extending in the X-axis direction, and the vertical and horizontal line pitches are the same or substantially the same. Among the horizontal lines, at least the potential distribution generating electrodes are patterned so that the widths of the horizontal lines and the vertical lines where the potential distribution generating electrodes are not superimposed in the length direction become smaller toward the center.
[0026]
According to the coordinate input device of the second invention as well, the voltage drop in the potential distribution generating electrode is reduced, the linearity of the equipotential lines formed near the potential distribution generating electrode is increased, and the resistance film is linear. A good potential distribution can be generated.
[0027]
In the third aspect of the invention, the frame-shaped potential distribution generation electrode is not provided in the peripheral portion on the resistance film, and instead, a driving voltage for alternately generating a potential distribution orthogonal to the resistance film is applied. Driving voltage application electrodes are provided at the four corners of the resistance film, and a potential distribution generating electrode composed of a triangle or a substantially triangular shape for generating a potential distribution is provided between the periphery of the resistance film and between the driving voltage application electrodes. And adjacent ones are arranged so as to be in a relationship of being rotated 180 degrees or approximately 180 degrees.
[0028]
According to the coordinate input device of the third aspect of the present invention, the voltage drop in the portion where the potential distribution generating electrodes are arranged is reduced, and the equipotential formed near the portion where the potential distribution generating electrodes are arranged. The linearity of the line can be improved, and a potential distribution with good linearity can be generated in the resistance film.
[0029]
In the coordinate input device according to the fourth aspect of the present invention, the voltage at the position selected as the input coordinate on the resistance film and the voltage at the predetermined position of the potential distribution generating electrode are detected, and the input coordinate on the resistance film is detected. Input coordinate detection means for detecting input coordinates from the voltage at the selected position and the voltage at a predetermined position of the potential distribution generating electrode is provided.
[0030]
According to the coordinate input device of the fourth aspect of the present invention, it is possible to detect the actually input coordinates in consideration of the nonlinearity of the potential distribution generated in the resistance film.
[0031]
As a means for detecting a voltage at a predetermined position of the potential distribution generating electrode, the tip of the side of the potential distribution generating electrode is protruded from the resistance film at the center or substantially the center of each side, and When a voltage detection electrode having a resistance lower than that of the potential distribution generation electrode in contact with the resistance film is provided, the curve of the equipotential line formed near the potential distribution generation electrode can be relaxed.
[0032]
In the coordinate input device according to the fifth aspect of the invention, the voltage at a predetermined position of the potential distribution generating electrode is detected, and the drive voltage for enhancing the linearity of the potential distribution generated in the resistance film is applied to the potential distribution generating electrode. Voltage detection / drive voltage generation means for applying to a predetermined position is provided.
[0033]
According to the coordinate input device of the fifth aspect of the invention, the linearity of the equipotential lines formed near the potential distribution generating electrode is improved by the voltage detection / drive voltage generating means, and the resistance film has good linearity. A potential distribution can be generated.
[0034]
In this case as well, as a means for detecting the voltage at a predetermined position of the potential distribution generating electrode, the tip of the potential distribution generating electrode protrudes from the central portion or substantially the central portion of the potential distribution generating electrode. In addition, a voltage detection electrode having a resistance lower than that of the potential distribution generation electrode in contact with the resistance film may be provided.
[0035]
  In the first to fifth aspects of the invention, the voltage detection conductive film is opposed to the resistance film at a constant interval, and the input coordinate is selected at a position corresponding to the input coordinate of the voltage detection conductive film. The input coordinate is detected by detecting the voltage at the position selected as the input coordinate on the resistance film via the voltage detection conductive film. It can also be configured.
[0036]
  Further, in this case, when the voltage detection conductive film comes into contact with the resistance film, a current is passed from the voltage detection conductive film side to the resistance film side, and the current is detected so that the voltage detection conductive film becomes a resistance. The voltage detection conductive film contact detection means for detecting contact with the film, and when the voltage detection conductive film contact detection means detects that the voltage detection conductive film is in contact with the resistance film, the drive voltage is You may make it provide the drive voltage supply means supplied to a coordinate input panel.
[0037]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the first to ninth embodiments of the coordinate input device of the present invention will be described with reference to FIGS.
[0038]
First Embodiment FIG. 1 to FIG. 6
FIG. 1 is a diagram schematically showing a main part of a first embodiment of a coordinate input device according to the present invention. In FIG. 1, 20 is a coordinate input panel, 21 is a coordinate plane, and 22 to 25 are peripheral electrodes forming a potential distribution generating electrode integrally formed in a frame shape and a belt shape around the coordinate surface 21. .
[0039]
Reference numerals 26 to 29 denote drive voltage application terminals to which a drive voltage is applied. The drive voltage application terminal 26 is applied with the power supply voltage VCC or the ground voltage 0 V, and the drive voltage application terminal 27 is applied with the power supply voltage VCC. The ground voltage 0V is applied to the drive voltage application terminal 28, and the power supply voltage VCC or the ground voltage 0V is applied to the drive voltage application terminal 29.
[0040]
Reference numeral 30 denotes a switch circuit for applying the power supply voltage VCC or the ground voltage 0 V to the drive voltage application terminals 26 and 29. The switch circuit 30 is used when the power supply voltage VCC is applied to the drive voltage application terminal 26. When the ground voltage 0V is applied to the drive voltage application terminal 29 and the ground voltage 0V is applied to the drive voltage application terminal 26, the power supply voltage VCC is controlled to be applied to the drive voltage application terminal 29.
[0041]
Further, 31 is a coordinate input pen for inputting coordinates by bringing the tip 31A into contact with the coordinate surface 21, and 32 is a coordinate for controlling the switch circuit 30 by a switch control signal and at which the tip 31A of the coordinate input pen 31 is in contact. It is an input coordinate detection circuit that detects coordinates on the surface 21.
[0042]
FIG. 2 is a schematic plan view showing the coordinate input panel 20, wherein 34 is a glass substrate, 35 is a resistance film formed on the glass substrate 34, and has a resistance value larger than that of the surrounding electrodes 22-25. It is.
[0043]
Here, the resistance film 35 has a lattice shape composed of a vertical line extending in the Y-axis direction and a horizontal line extending in the X-axis direction, and the vertical line width WV and the horizontal line width WH are the same or substantially the same. As shown in FIG. 4 and FIG. 4, the vertical pitch PV and the horizontal pitch PH are patterned so as to increase toward the center.
[0044]
In this case, the line width WV of the vertical line, the line width WH of the horizontal line, the pitch PV of the vertical line, and the pitch PH of the horizontal line are selected so that the tip 31A of the coordinate input pen 31 always contacts the resistance film 35. WV = WH can also be set.
[0045]
The resistance film 35 having such a pattern can be formed by etching if it is formed of an ITO film, and can be formed by screen printing or the like if it is formed of a carbon film.
[0046]
In the first embodiment of the coordinate input device of the present invention, the input coordinates are detected by applying the power supply voltage VCC to the drive voltage application terminals 26 and 27 and applying the ground voltage 0 V to the drive voltage application terminals 28 and 29. In this case, the voltage on the resistance film 35 at the position where the tip 31A of the coordinate input pen 31 is in contact, the power supply voltage VCC is applied to the drive voltage application terminals 27 and 29, and the drive voltage application terminals 26 and 28 are grounded. This is performed by detecting the voltage on the resistance film 35 at the position where the tip end 31A of the coordinate input pen 31 is in contact with the voltage 0V.
[0047]
5 and 6 are diagrams for explaining the operation and effect of the first embodiment of the coordinate input device according to the present invention. FIG. 5 applies the power supply voltage VCC to the drive voltage application terminals 26 and 27. FIG. FIG. 6 shows a part of the horizontal equipotential lines formed in the resistance film 35 when the ground voltage 0 V is applied to the drive voltage application terminals 28 and 29. FIG. A part of the vertical equipotential lines formed in the resistance film 35 when the power supply voltage VCC is applied to 29 and the ground voltage 0 V is applied to the drive voltage application terminals 26 and 28 is shown.
[0048]
In FIG. 5, i 26 a flows out from the drive voltage application terminal 26 to the peripheral electrode 22, flows through the resistance film 35, and flows into the drive voltage application terminal 28 through the peripheral electrode 23, and i 27 a indicates from the drive voltage application terminal 27 to the peripheral electrode. 22A, 37B, and 37C indicate a part of horizontal equipotential lines formed in the resistance film 35. The current 37A, 37B, and 37C flow into the resistance film 35 and flow into the drive voltage application terminal 29 via the peripheral electrode 23. ing.
[0049]
Here, in the first embodiment of the coordinate input device of the present invention, the resistance film 35 has the same or substantially the same line width WV, and the vertical pitch PV increases toward the center. Patterned.
[0050]
As a result, the difference between the current value of the current i26a flowing into the resistance film 35 and the current value flowing into the portion close to the peripheral electrode 24 and the current value flowing into the portion close to the center portion becomes larger than the conventional example. Of the current i27a flowing into the resistance film 35, the difference between the current value flowing into the portion close to the peripheral electrode 25 and the current value flowing into the portion close to the central portion is larger than in the conventional example.
[0051]
That is, the voltage drop from the drive voltage application terminals 26 and 27 to the center portion generated in the peripheral electrode 22 by the currents i26a and i27a is smaller than that in the conventional example, and is generated in the peripheral electrode 23 by the currents i26a and i27a. The voltage drop from the central portion to the drive voltage application terminals 28 and 29 side is also smaller than in the conventional example.
[0052]
As a result, among the equipotential lines in the horizontal direction formed in the resistance film 35, the equipotential lines 37A and 37C near the surrounding electrodes 22 and 23 can be made parallel to the surrounding electrodes 22 and 23. A potential distribution with good linearity is generated in the resistance film 35 from the peripheral electrode 22 side to the peripheral electrode 23 side.
[0053]
In FIG. 6, i 27 b flows from the drive voltage application terminal 27 to the peripheral electrode 25, flows through the resistance film 35, and flows into the drive voltage application terminal 26 through the peripheral electrode 24, and i 29 b indicates from the drive voltage application terminal 29. Currents 39A, 39B, and 39C that flow out to the peripheral electrode 25, flow through the resistance film 35, and flow into the drive voltage application terminal 28 via the peripheral electrode 24 are part of vertical equipotential lines formed in the resistance film 35. Is shown.
[0054]
Here, in the first embodiment of the coordinate input device of the present invention, the resistive film 35 has the same or substantially the same line width WH of the horizontal line, and the horizontal line pitch PH increases as it goes to the center. Patterned.
[0055]
As a result, of the current i27b flowing into the resistance film 35, the difference between the current value flowing into the portion close to the peripheral electrode 22 and the current value flowing into the portion close to the central portion becomes larger than the conventional example. Of the current i29b flowing into the resistance film 35, the difference between the current value flowing into the portion close to the peripheral electrode 23 and the current value flowing into the portion close to the central portion is larger than in the conventional example.
[0056]
That is, the voltage drop from the drive voltage application terminals 27 and 29 to the center portion generated in the peripheral electrode 25 by the currents i27b and i29b is smaller than that in the conventional example, and is generated in the peripheral electrode 24 by the currents i27b and i29b. The voltage drop from the central portion to the drive voltage application terminals 26 and 28 side is also smaller than in the conventional example.
[0057]
As a result, the equipotential lines 39A and 39C near the peripheral electrodes 25 and 24 among the vertical equipotential lines formed in the resistance film 35 can be parallel to the peripheral electrodes 25 and 24. A potential distribution with good linearity is generated in the resistance film 35 from the peripheral electrode 25 side to the peripheral electrode 24 side.
[0058]
Thus, according to the first embodiment of the coordinate input device of the present invention, it is possible to generate a potential distribution with good linearity in the resistance film 35 from the peripheral electrode 22 side to the peripheral electrode 23 side. Since a potential distribution with good linearity can be generated in the resistance film 35 from the peripheral electrode 25 side to the peripheral electrode 24 side, highly accurate coordinate input can be performed.
[0059]
Second Embodiment FIG. 7 to FIG.
The second embodiment of the coordinate input device of the present invention includes the coordinate input panel shown in FIG. 7 as the coordinate input panel, and the others are the first embodiment of the coordinate input device of the present invention shown in FIG. It is comprised similarly to a form.
[0060]
In FIG. 7, reference numeral 41 denotes a coordinate plane, 42 to 45 are peripheral electrodes forming a potential distribution generating electrode integrally formed in a frame shape and a belt shape around the coordinate plane 41, and 46 to 49 are applied with drive voltage. Drive voltage application terminal.
[0061]
A power supply voltage VCC or a ground voltage 0V is applied to the drive voltage application terminal 46, a power supply voltage VCC is applied to the drive voltage application terminal 47, a ground voltage 0V is applied to the drive voltage application terminal 48, and a drive voltage application terminal. A power supply voltage VCC or a ground voltage 0 V is applied to 49.
[0062]
Reference numeral 50 denotes a glass substrate, and 51 denotes a resistance film formed on the glass substrate 50 and having a resistance value larger than that of the peripheral electrodes 42 to 45.
[0063]
Here, the resistance film 51 has a lattice shape composed of a vertical line extending in the Y-axis direction and a horizontal line extending in the X-axis direction, and the vertical pitch PV and the horizontal line pitch PH are the same or substantially the same, respectively. 9, among the vertical lines and horizontal lines, the peripheral vertical lines and horizontal lines, that is, the vertical line width WV and the horizontal line width WH in which the peripheral electrodes 42 to 45 are not superimposed in the length direction, respectively. It is patterned to become smaller as it goes to the center.
[0064]
In this case, the line width WV of the perpendicular line, the line width WH of the horizontal line, the pitch PV of the perpendicular line, and the pitch PH of the horizontal line are selected so that the tip 31A of the coordinate input pen 31 always contacts the resistance film 51. And PV = PH.
[0065]
The resistance film 51 having such a pattern can be formed by etching if it is formed of an ITO film, and can be formed by screen printing or the like if it is formed of a carbon film.
[0066]
In the second embodiment of the coordinate input device of the present invention, the input coordinate is detected by applying the power supply voltage VCC to the drive voltage application terminals 46 and 47 and applying the ground voltage 0 V to the drive voltage application terminals 48 and 49. In this case, the voltage on the resistance film 51 at the position where the tip 31A of the coordinate input pen 31 is in contact, the power supply voltage VCC is applied to the drive voltage application terminals 47 and 49, and the drive voltage application terminals 46 and 48 are grounded. This is done by detecting the voltage on the resistive film 51 at the position where the tip 31A of the coordinate input pen 31 is in contact with the voltage 0V applied.
[0067]
10 and 11 are diagrams for explaining the operation and effect of the second embodiment of the coordinate input device of the present invention. FIG. 10 applies the power supply voltage VCC to the drive voltage application terminals 46 and 47. FIG. FIG. 11 shows a part of horizontal equipotential lines formed in the resistance film 51 when the ground voltage 0 V is applied to the drive voltage application terminals 48 and 49. FIG. A part of vertical equipotential lines formed in the resistance film 51 when the power supply voltage VCC is applied to 49 and the ground voltage 0 V is applied to the drive voltage application terminals 46 and 48 is shown.
[0068]
In FIG. 10, i 46 a flows out from the drive voltage application terminal 46 to the peripheral electrode 42, flows through the resistance film 51, and flows into the drive voltage application terminal 48 through the peripheral electrode 43, and i 47 a is from the drive voltage application terminal 47 to the peripheral electrode. , Current flowing into the drive voltage application terminal 49 via the peripheral electrode 43, and 53A, 53B, and 53C are a part of horizontal equipotential lines formed on the resistance film 51. ing.
[0069]
Here, in the second embodiment of the coordinate input device according to the present invention, the resistance film 51 has the same or substantially the same vertical pitch PV, and the vertical of the peripheral portion of the vertical lines, that is, the peripheral electrode 44, 45 is patterned so that the line width WV of the vertical line 45 not superposed in the length direction becomes smaller toward the center.
[0070]
As a result, of the current i 46 a flowing into the resistance film 51, the difference between the current value flowing into the portion close to the peripheral electrode 44 and the current value flowing into the portion close to the central portion becomes larger than the conventional example. Of the current i47a flowing into the resistance film 51, the difference between the current value flowing into the portion close to the peripheral electrode 45 and the current value flowing into the portion close to the central portion is larger than in the conventional example.
[0071]
That is, the voltage drop from the drive voltage application terminals 46 and 47 to the center portion generated in the peripheral electrode 42 by the currents i46a and i47a is smaller than that in the conventional example, and is generated in the peripheral electrode 43 by the currents i46a and i47a. The voltage drop from the central portion to the drive voltage application terminals 48 and 49 side is also smaller than in the conventional example.
[0072]
As a result, among the equipotential lines in the horizontal direction formed on the resistance film 51, the equipotential lines 53A and 53C near the surrounding electrodes 42 and 43 can be made parallel to the surrounding electrodes 42 and 43. A potential distribution with good linearity is generated in the resistance film 51 from the peripheral electrode 42 side to the peripheral electrode 43 side.
[0073]
In FIG. 11, i 47 b flows from the drive voltage application terminal 47 to the peripheral electrode 45, flows through the resistance film 51, and flows into the drive voltage application terminal 46 through the peripheral electrode 44, and i 49 b indicates from the drive voltage application terminal 49. Currents 55A, 55B, and 55C that flow out to the peripheral electrode 45, flow through the resistance film 51, and flow into the drive voltage application terminal 48 through the peripheral electrode 44 are part of vertical equipotential lines formed in the resistance film 51. Is shown.
[0074]
Here, in the second embodiment of the coordinate input device of the present invention, the resistive film 51 has the same or substantially the same horizontal line pitch PH, and of the horizontal lines, the peripheral horizontal lines, that is, the peripheral electrodes 42, 43 is patterned so that the line width WH of the horizontal line 43 that is not superimposed in the length direction becomes smaller toward the center.
[0075]
As a result, of the current i47b flowing into the resistance film 51, the difference between the current value flowing into the portion close to the peripheral electrode 42 and the current value flowing into the portion close to the central portion becomes larger than the conventional example. Of the current i 49 b flowing into the resistance film 51, the difference between the current value flowing into the portion close to the peripheral electrode 43 and the current value flowing into the portion close to the central portion is larger than in the conventional example.
[0076]
That is, the voltage drop from the drive voltage application terminals 47 and 49 to the center portion generated in the peripheral electrode 45 by the currents i47b and i49b is smaller than that in the conventional example, and is generated in the peripheral electrode 44 by the currents i47b and i49b. The voltage drop from the central portion to the drive voltage application terminals 46 and 48 side is also smaller than in the conventional example.
[0077]
As a result, among the equipotential lines in the vertical direction formed in the resistance film 51, the equipotential lines 55A and 55C near the surrounding electrodes 45 and 44 can be made parallel to the surrounding electrodes 45 and 44, A potential distribution with good linearity is generated in the resistance film 51 from the peripheral electrode 45 side to the peripheral electrode 44 side.
[0078]
Thus, according to the second embodiment of the coordinate input device of the present invention, a potential distribution with good linearity can be generated in the resistive film 51 from the peripheral electrode 42 side to the peripheral electrode 43 side. Since a potential distribution with good linearity can be generated in the resistive film 51 from the peripheral electrode 45 side to the peripheral electrode 44 side, highly accurate coordinate input can be performed.
[0079]
Third embodiment FIG. 12 to FIG. 15
The third embodiment of the coordinate input device of the present invention includes the coordinate input panel shown in FIG. 12 as the coordinate input panel, and the others are the first embodiment of the coordinate input device of the present invention shown in FIG. It is comprised similarly to a form.
[0080]
In FIG. 12, reference numeral 57 denotes a resistance film formed on a glass substrate, and 58 to 61 denote peripheral electrode portions in which triangular electrodes 62 for generating a potential distribution composed of triangles having the same shape are arranged.
[0081]
Here, the peripheral electrode portions 58 to 61 are provided in the peripheral portion of the resistance film 57, and the triangular electrode 62 has a relationship in which the base 62A is parallel to the arrangement direction and adjacent ones are rotated 180 degrees. Are arranged in a band with a certain gap.
[0082]
Reference numerals 63 to 66 denote drive voltage application electrodes to which a drive voltage is applied. The power supply voltage VCC or the ground voltage 0 V is applied to the drive voltage application electrode 63, and the power supply voltage VCC is applied to the drive voltage application electrode 64. Is applied, the ground voltage 0V is applied to the drive voltage application electrode 65, and the power supply voltage VCC or the ground voltage 0V is applied to the drive voltage application electrode 66.
[0083]
In the third embodiment of the coordinate input device of the present invention, the input coordinate is detected by applying the power supply voltage VCC to the drive voltage application electrodes 63 and 64 and applying the ground voltage of 0 V to the drive voltage application electrodes 65 and 66. When the voltage is applied, the voltage on the resistance film 57 at the position where the tip 31A of the coordinate input pen 31 is in contact and the power supply voltage VCC are applied to the drive voltage application electrodes 64 and 66, and the drive voltage application electrode 63 is applied. , 65 by detecting the voltage on the resistance film 57 at the position where the tip 31A of the coordinate input pen 31 is in contact with the ground voltage 0V.
[0084]
FIG. 13 is an enlarged schematic plan view showing the peripheral electrode portion 58. The sheet resistance of the resistance film 57 is represented by ρ.0(Ω / □), the length of the hypotenuses 62B, 62C of the triangular electrode 62 is b, the distance between the hypotenuses 62B, 62B and the hypotenuses 62C, 62C between the adjacent triangular electrodes 62, 62, ie, the triangular electrodes 62, 62. When the gap a and the number of triangular electrodes 62 are n, the resistance of the triangular electrode 62 is the sheet resistance ρ of the resistive film 57.0When it is smaller enough, the resistance R of the peripheral electrode portion 58 is as shown in Equation 1.
[0085]
[Expression 1]
Figure 0003799639
[0086]
Here, when the length of the peripheral electrode portion 58 is L and b >> a, b can be expressed as shown in Equation 2, so that the resistance R of the peripheral electrode portion 58 is expressed as shown in Equation 3. Can be represented.
[0087]
[Expression 2]
Figure 0003799639
[0088]
[Equation 3]
Figure 0003799639
[0089]
That is, when the triangular electrode 62 is reduced and the gap a between the triangular electrodes 62 and 62 is reduced, the resistance R of the peripheral electrode portion 58 can be determined only by the gap a between the triangular electrodes 62 and 62. The voltage drop due to the current flowing through the peripheral electrode portion 58 can be reduced. The same applies to the peripheral electrode portions 59 to 61.
[0090]
As a result, the horizontal equipotential lines near the peripheral electrode portions 58 and 59 can be made parallel to the peripheral electrode portions 58 and 59, and the vertical portions near the peripheral electrode portions 61 and 60 can be set in the vertical direction. The equipotential lines can be parallel to the surrounding electrode portions 61 and 60.
[0091]
Therefore, according to the third embodiment of the coordinate input device of the present invention, a potential distribution with good linearity can be generated in the resistance film 57 from the peripheral electrode portion 58 side to the peripheral electrode portion 59 side. Since a potential distribution with good linearity can be generated in the resistive film 57 from the peripheral electrode portion 61 side to the peripheral electrode portion 60 side, highly accurate coordinate input can be performed.
[0092]
14 shows, for example, the relationship between the position in the horizontal direction of the resistive film 57 and the gap a between the triangular electrodes 62 and 62 in the peripheral electrode portions 58 to 61, between the triangular electrodes 62 and 62. When the gap a is made smaller toward the center, the voltage drop in the peripheral electrode portions 58 to 61 can be made smaller than in the third embodiment of the coordinate input device of the present invention, and the resistance film 57, an equipotential line with better linearity can be formed.
[0093]
15 shows, for example, the relationship between the horizontal position of the resistive film 57 and the length b of the hypotenuses 62B and 62C of the triangular electrode 62 in the peripheral electrode portions 58 to 61. In the case where the length b of the oblique sides 62B and 62C is increased toward the center, the voltage drop in the peripheral electrode portions 58 to 61 is made smaller than in the third embodiment of the coordinate input device of the present invention. Thus, equipotential lines with better linearity can be formed in the resistance film 57.
[0094]
Fourth embodiment FIG. 16
FIG. 16 is a diagram schematically showing an essential part of a fourth embodiment of the coordinate input device of the present invention. In FIG. 16, 68 is a coordinate input panel, 69 is a resistance film formed on a glass substrate, 70 to 73 are potential distributions formed integrally around the resistance film 69 in a frame shape and a belt shape. This is a peripheral electrode having a lower resistance than the resistance film 69 that forms the electrode for use.
[0095]
Reference numerals 74 to 77 denote drive voltage application terminals to which a drive voltage is applied. The drive voltage application terminal 74 is applied with the power supply voltage VCC or the ground voltage 0 V, and the drive voltage application terminal 75 is applied with the power supply voltage VCC. The ground voltage 0V is applied to the drive voltage application terminal 76, and the power supply voltage VCC or the ground voltage 0V is applied to the drive voltage application terminal 77.
[0096]
Reference numeral 78 denotes a monitor electrode provided at the central portion of the peripheral electrode 70 for monitoring the voltage at the central portion of the peripheral electrode 70. Reference numeral 79 denotes a central portion of the peripheral electrode 71 for monitoring the voltage at the central portion of the peripheral electrode 71. It is the monitor electrode provided in the part.
[0097]
Reference numeral 80 denotes a monitor electrode provided at the central part of the peripheral electrode 72 for monitoring the voltage at the central part of the peripheral electrode 72, and reference numeral 81 denotes a central part of the peripheral electrode 73 for monitoring the voltage at the central part of the peripheral electrode 73. It is the monitor electrode provided in the part.
[0098]
Reference numeral 82 denotes a switch circuit for applying the power supply voltage VCC or the ground voltage 0 V to the drive voltage application terminals 74 and 77. This switch circuit 82 is used when the power supply voltage VCC is applied to the drive voltage application terminal 74. When the ground voltage 0 V is applied to the drive voltage application terminal 77 and the ground voltage 0 V is applied to the drive voltage application terminal 74, the power supply voltage VCC is controlled to be applied to the drive voltage application terminal 77.
[0099]
Reference numeral 83 is a coordinate input pen for inputting coordinates by bringing the tip 83A into contact with the resistance film 69, and 84 is an input coordinate detection circuit for detecting the coordinates on the resistance film 69 with which the tip 83A of the coordinate input pen 83 is in contact. 85 is a voltage detection circuit for detecting the voltage at the center of the peripheral electrodes 70 to 73 via the monitor electrodes 78 to 81.
[0100]
Here, the input coordinate detection circuit 84 controls the switch circuit 82 by a switch control signal, and the voltage on the resistance film 69 with which the tip 83A of the coordinate input pen 83 is in contact with the voltage detected by the voltage detection circuit 85. Considering the non-linearity of the potential distribution from the voltage at the center of the electrodes 70 to 73, the coordinates on the resistive film 69 where the tip 83A of the coordinate input pen 83 actually contacts are detected. .
[0101]
In the fourth embodiment of the coordinate input device of the present invention, the input coordinate is detected by applying the power supply voltage VCC to the drive voltage application terminals 74 and 75 and applying the ground voltage of 0 V to the drive voltage application terminals 76 and 77. In this case, the voltage on the resistance film 69 at the position where the tip 83A of the coordinate input pen 83 is in contact, the power supply voltage VCC is applied to the drive voltage application terminals 75 and 77, and the drive voltage application terminals 74 and 76 are grounded. This is performed by detecting the voltage on the resistance film 69 at the position where the tip 83A of the coordinate input pen 83 is in contact when the voltage 0V is applied.
[0102]
Here, in the input coordinate detection circuit 84, the voltage on the resistance film 69 with which the tip 83 </ b> A of the coordinate input pen 83 is in contact with the voltage at the center of the peripheral electrodes 70 to 73 detected by the voltage detection circuit 85. Considering the non-linearity of the potential distribution, the coordinates on the resistance film 69 where the tip 83A of the coordinate input pen 83 actually contacts are detected.
[0103]
Therefore, according to the fourth embodiment of the coordinate input device of the present invention, highly accurate coordinate input can be performed even when the potential distribution generated in the resistance film 69 is not linear.
[0104]
Fifth form FIG. 17
FIG. 17 is a diagram schematically showing a main part of a fifth embodiment of the coordinate input device according to the present invention. The fifth embodiment of the coordinate input device according to the present invention is a monitor as shown in FIG. The electrodes 78 to 81 are not formed, and the voltages of the drive voltage application terminals 74 to 77 are monitored. In the input coordinate detection circuit 84, the voltage on the resistance film 69 with which the tip 83A of the coordinate input pen 83 is in contact with the voltage detection. The coordinates on the resistive film 69 that the tip 83A of the coordinate input pen 83 actually contacts are detected from the voltages of the drive voltage application terminals 74 to 77 detected by the circuit 85 in consideration of the non-linearity of the potential distribution. The other configuration is the same as that of the fourth embodiment of the coordinate input device of the present invention shown in FIG.
[0105]
Also in the fifth embodiment of the coordinate input device of the present invention, the input coordinate is detected by applying the power supply voltage VCC to the drive voltage application terminals 74 and 75 and applying the ground voltage 0 V to the drive voltage application terminals 76 and 77. In this case, the voltage on the resistance film 69 at the position where the tip 83A of the coordinate input pen 83 is in contact, the power supply voltage VCC is applied to the drive voltage application terminals 75 and 77, and the drive voltage application terminals 74 and 76 are grounded. This is performed by detecting the voltage on the resistance film 69 at the position where the tip 83A of the coordinate input pen 83 is in contact when the voltage 0V is applied.
[0106]
Here, in the input coordinate detection circuit 84, the voltage on the resistance film 69 with which the tip 83 </ b> A of the coordinate input pen 83 is in contact with the voltages of the drive voltage application terminals 74 to 77 detected by the voltage detection circuit 85. Considering the non-linearity of the potential distribution, the coordinates on the resistive film 69 where the tip 83A of the coordinate input pen 83 actually contacts are detected.
[0107]
Therefore, even in the fifth embodiment of the coordinate input device of the present invention, as in the fourth embodiment of the coordinate input device of the present invention, the potential distribution generated in the resistance film 69 is not linear. However, highly accurate coordinate input can be performed.
[0108]
Sixth Embodiment FIG. 18
The sixth embodiment of the coordinate input device of the present invention is provided with the coordinate input panel shown in FIG. 18 as the coordinate input panel, and the others are the fourth embodiment of the coordinate input device of the present invention shown in FIG. It is comprised similarly to a form.
[0109]
In this coordinate input panel, instead of the monitor electrodes 78, 79, 80, 81 shown in FIG. 16, the planar shape is T-shaped, and the tips 86 A, 87 A, 88 A, 89 A are projected on the resistance film 69. In addition, monitor electrodes 86, 87, 88, 89 having a resistance lower than that of the surrounding electrodes 70 to 73 in contact with the resistance film 69 are provided, and the others are configured in the same manner as the coordinate input panel 68 shown in FIG. It is.
[0110]
Also in the sixth embodiment of the coordinate input device of the present invention, the input coordinate is detected by applying the power supply voltage VCC to the drive voltage application terminals 74 and 75 and applying the ground voltage 0 V to the drive voltage application terminals 76 and 77. In this case, the voltage on the resistance film 69 at the position where the tip 83A of the coordinate input pen 83 is in contact, the power supply voltage VCC is applied to the drive voltage application terminals 75 and 77, and the drive voltage application terminals 74 and 76 are grounded. This is performed by detecting the voltage on the resistance film 69 at the position where the tip 83A of the coordinate input pen 83 is in contact when the voltage 0V is applied.
[0111]
Here, 90A, 90B and 90C are horizontal equipotential lines generated when the power supply voltage VCC is applied to the drive voltage application terminals 74 and 75 and the ground voltage 0V is applied to the drive voltage application terminals 76 and 77. Some are shown.
[0112]
Thus, in the sixth embodiment of the coordinate input device of the present invention, the tip portions 86A, 87A of the monitor electrodes 86, 87 having a resistance lower than that of the surrounding electrodes 70, 71 are projected on the resistance film 69, In addition, since the contact is made with the resistance film 69, the curves of the horizontal equipotential lines 90A and 90C formed near the peripheral electrodes 70 and 71 can be relaxed.
[0113]
Further, since the tip portions 88A and 89A of the monitor electrodes 88 and 89 having lower resistance than the surrounding electrodes 72 and 73 are projected on the resistance film 69 and are in contact with the resistance film 69, the drive voltage application terminal 75, When the power supply voltage VCC is applied to 77 and the ground voltage 0 V is applied to the drive voltage application terminals 74 and 76, the curvature of the vertical equipotential lines generated near the peripheral electrodes 72 and 73 can be alleviated. .
[0114]
Further, according to the sixth embodiment of the coordinate input device of the present invention, in the input coordinate detection circuit 84, the voltage on the resistance film 69 in contact with the tip 83A of the coordinate input pen 83, and the voltage detection circuit In consideration of the non-linearity of the potential distribution, the coordinates on the resistive film 69 where the tip 83A of the coordinate input pen 83 actually contacts are detected from the voltage at the center of the peripheral electrodes 70 to 73 detected at 85. The
[0115]
Therefore, even in the sixth embodiment of the coordinate input device of the present invention, as in the fourth embodiment of the coordinate input device of the present invention, the potential distribution generated in the resistance film 69 is not linear. However, highly accurate coordinate input can be performed.
[0116]
Seventh Embodiment FIG. 19 and FIG.
FIG. 19 is a diagram schematically showing a main part of a seventh embodiment of the coordinate input device of the present invention. In the seventh embodiment of the coordinate input device of the present invention, as an input coordinate detection circuit, The input coordinate detection circuit 32 shown in FIG. 1 having no voltage detection circuit for detecting the voltage monitored by the monitor electrodes 78 to 81 is provided, and the monitor electrodes 78 to 81 have voltage detection / drive voltage generation, respectively. The other components are connected to the circuits 91 to 94, and are configured in the same manner as the fourth embodiment of the coordinate input device of the present invention shown in FIG.
[0117]
Here, the voltage detection / drive voltage generation circuits 91 to 94 detect the voltages monitored by the monitor electrodes 78 to 81, determine the non-linearity of the potential distribution, and make the potential distribution have good linearity. Is applied to the monitor electrodes 78-81.
[0118]
These voltage detection / drive voltage generation circuits 91 to 94 have the same circuit configuration, FIG. 20 shows the configuration of the voltage detection / drive voltage generation circuit 91, and 96 is a peripheral electrode monitored by the monitor electrode 78. A voltage detection circuit 97 for detecting the voltage at the central portion of 70 is provided on the monitor electrode 78 in order to make the potential distribution of the resistance film 69 have good linearity based on the voltage detected by the voltage detection circuit 96. An arithmetic circuit for outputting voltage information indicating the drive voltage to be applied, and 98 is a drive voltage generating circuit for outputting the drive voltage to be applied to the monitor electrode 78 based on the voltage information output from the arithmetic circuit 97.
[0119]
In the seventh embodiment of the coordinate input device of the present invention, the input coordinate is detected by applying the power supply voltage VCC to the drive voltage application terminals 74 and 75 and applying the ground voltage 0 V to the drive voltage application terminals 76 and 77. In this case, the voltage on the resistance film 69 at the position where the tip 83A of the coordinate input pen 83 is in contact, the power supply voltage VCC is applied to the drive voltage application terminals 75 and 77, and the drive voltage application terminals 74 and 76 are grounded. This is performed by detecting the voltage on the resistance film 69 at the position where the tip 83A of the coordinate input pen 83 is in contact when the voltage 0V is applied.
[0120]
Here, the voltage detection / drive voltage generation circuits 91 to 94 change the potential distribution of the resistance film 69 with good linearity based on the voltage at the center of the peripheral electrodes 70 to 73 monitored by the monitor electrodes 78 to 81. A drive voltage intended to be applied is applied to the monitor electrodes 78-81.
[0121]
Therefore, according to the seventh embodiment of the coordinate input device of the present invention, it is possible to generate a potential distribution with good linearity in the resistance film 69 and perform coordinate input with high accuracy.
[0122]
In place of the coordinate input panel 68, a coordinate input panel shown in FIG. 18 may be used.
[0123]
Eighth form ... FIG.
FIG. 21 is a diagram schematically showing a main part of an eighth embodiment of the coordinate input device of the present invention. In FIG. 21, reference numeral 100 denotes a coordinate input panel. The coordinate input panel 100 includes a coordinate input panel 68 shown in FIG. 102.
[0124]
Reference numeral 103 denotes a coordinate input pen. When the coordinate is input, the coordinate input pen 103 pressurizes the position corresponding to the input coordinates of the voltage detection conductive film 102 with the tip 103A, and the voltage detection conductive film 102 is pressed. It is used so that a portion facing the resistance film 69 at a position corresponding to the input coordinates of the input film contacts the resistance film 69.
[0125]
Reference numeral 104 denotes a switch circuit that applies a drive voltage to the drive voltage application terminals 74 to 77 of the coordinate input panel 68. The switch circuit 104 has a drive voltage before the voltage detecting conductive film 102 contacts the resistance film. When the ground voltage 0V is applied to the application terminals 74 to 77 and the voltage detection conductive film 102 contacts the resistance film, the power supply voltage VCC and the ground voltage 0V are alternately applied to the drive voltage application terminal 74, and the drive voltage application terminal 75. The power supply voltage VCC is applied, the ground voltage 0V is applied to the drive voltage application terminal 76, and the ground voltage 0V and the power supply voltage VCC are alternately applied to the drive voltage application terminal 77.
[0126]
Reference numeral 105 denotes a wiring connected to the voltage detection conductive film 102, and 106 denotes an input coordinate detection circuit that detects coordinates input by the coordinate input pen 103.
[0127]
In this input coordinate detection circuit 106, 107 detects voltage detection conductive film contact detection means for detecting whether or not the voltage detection conductive film 102 is in contact with the resistance film 69 by detecting whether or not current flows. Reference numeral 108 denotes a comparator, 108 is a comparator, 109 is a reference power source, 110 and 111 are resistors, and 112 is a connection switch element.
[0128]
Reference numeral 113 denotes an A / D converter (analog / digital converter) that converts a voltage on the resistance film 69 detected through the voltage detecting conductive film 102 into a digital signal, and reference numeral 114 denotes a switch circuit 104 based on the switch control signal SA. MCU (micro controller unit) that controls the connection switch element 112 by the switch control signal SB and detects input coordinates from the output of the A / D converter 113.
[0129]
Here, in the eighth embodiment of the coordinate input device of the present invention, before the voltage detecting conductive film 102 contacts the resistance film 69, the switch circuit 104 causes the drive voltage application terminals 74 to 77 to be connected to the ground voltage of 0V. Is applied, and the connection switch element 112 is turned on.
[0130]
When the tip 103A of the coordinate input pen 103 pressurizes the voltage detecting conductive film 102 and the pressurizing point of the voltage detecting conductive film 102 contacts the resistance film 69, a resistor 110 and a connection switch element 112 are connected from the VCC power source. , The resistance 111, the voltage detection conductive film 102, the resistance film 69, and the drive voltage application terminals 74 to 77, a current flows to the ground side, and a potential difference is generated between the resistances 111, which is detected by the comparator 108. Information indicating that the voltage detection conductive film 102 is in contact with the resistance film 69 is given from the device 108 to the MCU 114.
[0131]
Then, the MCU 114 brings the connection switch element 112 into a non-conductive state and controls the switch circuit 104 to alternately apply the power supply voltage VCC and the ground voltage 0 V to the drive voltage application terminal 74, and to the drive voltage application terminal 75. The power supply voltage VCC is applied, the ground voltage 0V is applied to the drive voltage application terminal 76, and the ground voltage 0V and the power supply voltage VCC are alternately applied to the drive voltage application terminal 77.
[0132]
As a result, the voltage on the resistance film 69 at the position where the voltage detection conductive film 102 is in contact is input to the A / D converter 113, which digitizes this and supplies it to the MCU 114. The input coordinates are detected based on the input voltage on the resistance film 69 that has been digitized.
[0133]
Thus, according to the eighth embodiment of the coordinate input apparatus of the present invention, whether or not the voltage detection conductive film 102 is in contact with the resistance film 69 is detected by the voltage drop in the resistor 111. Detection of whether or not the voltage detection conductive film 102 is in contact with the resistance film 69 even when the contact resistance changes. The input coordinates can be reliably detected.
[0134]
In the eighth embodiment of the coordinate input device according to the present invention, the case where the coordinate input panel 68 shown in FIG. 16 is used as the coordinate input panel has been described. The coordinate input panel 20 shown in FIG. 7, the coordinate input panel shown in FIG. 7, the coordinate input panel shown in FIG. 12, the coordinate input panel shown in FIG. 18, and the like can be used.
[0135]
Ninth Embodiment FIG. 22
FIG. 22 is a diagram schematically showing the main part of the ninth embodiment of the coordinate input device of the present invention. The ninth embodiment of the coordinate input device of the present invention is the input coordinate detection shown in FIG. An input coordinate detection circuit 116 having a circuit configuration different from that of the circuit 106 is provided, and the others are configured in the same manner as in the eighth embodiment of the coordinate input device of the present invention shown in FIG.
[0136]
Here, the input coordinate detection circuit 116 is provided with a touch detection circuit 117 having a circuit configuration different from that of the touch detection circuit 107 shown in FIG. 21, and the others are configured in the same manner as the input coordinate detection circuit 106 shown in FIG. is there.
[0137]
In the touch detection circuit 117, 118 and 119 are resistors, 120 is a PNP transistor that forms a connection switch element whose conduction and non-conduction are controlled by a switch control signal SB from the MCU 114, and 121 is a PNP transistor that detects a potential difference of the resistor 118. is there.
[0138]
In the ninth embodiment of the coordinate input device of the present invention, the ground voltage 0V is applied to the drive voltage application terminals 74 to 76 by the switch circuit 104 before the voltage detecting conductive film 102 contacts the resistance film 69. At the same time, the PNP transistor 120 is turned on.
[0139]
When the tip 103A of the coordinate input pen 103 pressurizes the voltage detecting conductive film 102 and the pressing point of the voltage detecting conductive film 102 contacts the resistance film 69, the PNP transistor 120, the resistor 118, A current flows to the ground side through the voltage detection conductive film 102, the resistance film 69, and the drive voltage application terminals 74 to 77, a potential difference is generated between the resistors 118, and is detected by the PNP transistor 121. The PNP transistor 121 passes through the MCU 114. On the other hand, information that the conductive film for voltage detection 102 is in contact with the resistance film 69 is given.
[0140]
Then, the MCU 114 brings the PNP transistor 120 into a non-conducting state and controls the switch circuit 104 by the switch control signal SA to alternately apply the power supply voltage VCC and the ground voltage 0V to the drive voltage application terminal 74, thereby driving the drive voltage. The power supply voltage VCC is applied to the application terminal 75, the ground voltage 0V is applied to the drive voltage application terminal 76, and the ground voltage 0V and the power supply voltage VCC are alternately applied to the drive voltage application terminal 77.
[0141]
As a result, the voltage on the resistance film 69 at the position where the voltage detection conductive film 102 is in contact is input to the A / D converter 113, which digitizes this and supplies it to the MCU 114. The input coordinates are detected based on the input voltage on the resistance film 69 that has been digitized.
[0142]
As described above, according to the ninth embodiment of the coordinate input device of the present invention, whether or not the voltage detection conductive film 102 is in contact with the resistance film 69 is detected by whether a voltage drop occurs in the resistor 118. Detection of whether or not the voltage detection conductive film 102 is in contact with the resistance film 69 even when the contact resistance changes. The input coordinates can be reliably detected.
[0143]
In the ninth embodiment of the coordinate input device of the present invention, the case where the coordinate input panel 68 shown in FIG. 16 is used as the coordinate input panel has been described. The coordinate input panel 20 shown in FIG. 7, the coordinate input panel shown in FIG. 7, the coordinate input panel shown in FIG. 12, the coordinate input panel shown in FIG. 18, and the like can be used.
[0144]
【The invention's effect】
As described above, according to the coordinate input device of the first and second aspects of the present invention, the voltage drop in the potential distribution generating electrode is reduced, and is formed near the potential distribution generating electrode. Since the linearity of the potential line can be enhanced and a potential distribution with good linearity can be generated in the resistive film, highly accurate coordinate input can be performed.
[0145]
According to the coordinate input device of the third aspect of the invention, the voltage drop in the portion where the potential distribution generating electrodes are arranged is reduced, and it is formed near the portion where the potential distribution generating electrodes are arranged. Since the linearity of the potential line can be enhanced and a potential distribution with good linearity can be generated in the resistive film, highly accurate coordinate input can be performed.
[0146]
In addition, according to the coordinate input device of the fourth aspect of the invention, it is possible to detect the actually input coordinates in consideration of the non-linearity of the potential distribution generated in the resistive film, and thus the potential distribution generated in the resistive film. Even if there is no linearity, coordinate input with high accuracy can be performed.
[0147]
According to the coordinate input device of the fifth aspect of the invention, the voltage detection / drive voltage generation means increases the linearity of the equipotential line formed near the potential distribution generation electrode, and the resistance film has good linearity. Therefore, accurate coordinate input can be performed.
[0148]
  In the first to fifth aspects of the invention, the voltage detection conductive film is opposed to the resistance film at a constant interval, and the input coordinate is selected at a position corresponding to the input coordinate of the voltage detection conductive film. The input coordinate is detected by detecting the voltage at the position selected as the input coordinate on the resistance film via the voltage detection conductive film. When the voltage detection conductive film contacts the resistance film, a current is passed from the voltage detection conductive film side to the resistance film side, and by detecting this current, the voltage detection conductive film becomes a resistance film. The voltage detecting conductive film contact detecting means for detecting that the voltage detecting conductive film is touched, and when the voltage detecting conductive film contact detecting means detects that the voltage detecting conductive film is in contact with the resistance film, the driving voltage is coordinated. Provide input panel If you like and a drive voltage supplying means for theEven when the contact resistance changes, it is possible to reliably detect whether or not the voltage detection conductive film is in contact with the resistance film, and it is possible to reliably detect the input coordinates.
[Brief description of the drawings]
FIG. 1 is a diagram schematically showing a main part of a first embodiment of a coordinate input device of the present invention.
FIG. 2 is a schematic plan view showing a coordinate input panel provided in the first embodiment of the coordinate input device of the present invention.
FIG. 3 is a diagram showing the relationship between the horizontal position of the coordinate plane of the coordinate input panel provided in the first embodiment of the coordinate input device of the present invention and the pitch of the perpendicular of the resistance film;
FIG. 4 is a diagram showing the relationship between the position in the vertical direction of the coordinate plane of the coordinate input panel provided in the first embodiment of the coordinate input device of the present invention and the pitch of the horizontal line of the resistive film.
FIG. 5 is a diagram for explaining the operation and effect of the first embodiment of the coordinate input device of the present invention.
FIG. 6 is a diagram for explaining the operation and effect of the first embodiment of the coordinate input device of the present invention.
FIG. 7 is a schematic plan view showing a coordinate input panel provided in a second embodiment of the coordinate input device of the present invention.
8 is a diagram showing the relationship between the horizontal position of the resistance film normal and the line width of the resistance film normal on the coordinate plane of the coordinate input panel shown in FIG. 7;
9 is a diagram showing the relationship between the vertical position of the horizontal line of the resistive film and the line width of the horizontal line of the resistive film on the coordinate plane of the coordinate input panel shown in FIG. 7;
FIG. 10 is a diagram for explaining the operation and effect of the second embodiment of the coordinate input device of the present invention.
FIG. 11 is a diagram for explaining the operation and effect of the second embodiment of the coordinate input device of the present invention.
FIG. 12 is a schematic plan view showing a coordinate input panel provided in a third embodiment of the coordinate input device of the present invention.
FIG. 13 is a schematic plan view showing a peripheral electrode portion of a coordinate input panel provided in a third embodiment of the coordinate input device of the present invention.
FIG. 14 is a diagram showing a relationship between a horizontal position of a resistive film and a gap between triangular electrodes in a coordinate input panel provided in a third embodiment of the coordinate input device of the present invention.
FIG. 15 is a diagram showing a relationship between a horizontal position of a resistive film and a length of a hypotenuse of a triangular electrode in a coordinate input panel provided in a third embodiment of the coordinate input device of the present invention.
FIG. 16 is a diagram schematically showing the main part of a fourth embodiment of the coordinate input device of the present invention.
FIG. 17 is a diagram schematically showing a main part of a fifth embodiment of the coordinate input device of the present invention.
FIG. 18 is a schematic plan view showing a coordinate input panel provided in a sixth embodiment of the coordinate input device of the present invention.
FIG. 19 is a diagram schematically showing the main part of a seventh embodiment of the coordinate input device of the present invention.
FIG. 20 is a circuit diagram showing a configuration of a voltage detection / drive voltage generation circuit provided in a seventh embodiment of the coordinate input device of the present invention;
FIG. 21 is a diagram schematically showing a main part of an eighth embodiment of the coordinate input device of the present invention.
FIG. 22 is a diagram schematically showing a main part of a ninth embodiment of the coordinate input device of the present invention.
FIG. 23 is a diagram schematically showing a main part of an example of a conventional coordinate input device.
FIG. 24 is a diagram for explaining a problem that the conventional coordinate input device shown in FIG. 23 has.
FIG. 25 is a diagram for explaining problems of the conventional coordinate input device shown in FIG.
FIG. 26 is a diagram for explaining an example of a conventional method proposed as improving the linearity of a potential distribution generated in a resistance film of a coordinate input panel.
[Explanation of symbols]
22-25 Ambient electrode
26 to 29 Driving voltage application terminal
31 Coordinate input pen

Claims (10)

矩形状の基板と、この基板上に形成された抵抗膜と、この抵抗膜上の周辺部に枠状に形成され、直交する電位分布を前記抵抗膜に交互に発生させるための駆動電圧が四隅に印加される電位分布発生用電極とを備え、前記抵抗膜の所定の領域を直交座標面とする座標入力パネルを有し、前記抵抗膜上、入力座標として選択された位置の電圧を検出することにより、入力座標の検出を行う座標入力装置において、前記抵抗膜は、Ｙ軸方向に延びる垂線及びＸ軸方向に延びる水平線からなる格子状に、かつ、前記垂線及び前記水平線の線幅をそれぞれ同一ないし略同一とし、前記垂線及び前記水平線のピッチがそれぞれ中央部にいくに従って大きくなるようにパターニングされていることを特徴とする座標入力装置。  A rectangular substrate, a resistance film formed on the substrate, and a frame formed around the resistance film in a frame shape, drive voltages for alternately generating an orthogonal potential distribution in the resistance film are provided at four corners. And a voltage input panel having a predetermined area of the resistive film as an orthogonal coordinate plane, and detecting a voltage at a position selected as an input coordinate on the resistive film. Thus, in the coordinate input device that detects the input coordinates, the resistive film has a lattice shape including a vertical line extending in the Y-axis direction and a horizontal line extending in the X-axis direction, and the line widths of the vertical line and the horizontal line are respectively set. A coordinate input device characterized in that it is the same or substantially the same, and is patterned so that the pitches of the vertical line and the horizontal line increase toward the center. 矩形状の基板と、この基板上に形成された抵抗膜と、この抵抗膜上の周辺部に枠状に形成され、直交する電位分布を前記抵抗膜に交互に発生させるための駆動電圧が四隅に印加される電位分布発生用電極とを備え、前記抵抗膜の所定の領域を直交座標面とする座標入力パネルを有し、前記抵抗膜上、入力座標として選択された位置の電圧を検出することにより、入力座標の検出を行う座標入力装置において、前記抵抗膜は、Ｙ軸方向に延びる垂線及びＸ軸方向に延びる水平線からなる格子状に、かつ、前記垂線及び前記水平線のピッチをそれぞれ同一ないし略同一とし、前記垂線及び前記水平線のうち、少なくとも、前記電位分布発生用電極が長さ方向に重畳されていない水平線及び垂線の線幅がそれぞれ中央部にいくに従って小さくなるようにパターニングされていることを特徴とする座標入力装置。  A rectangular substrate, a resistance film formed on the substrate, and a frame formed around the resistance film in a frame shape, drive voltages for alternately generating an orthogonal potential distribution in the resistance film are provided at four corners. And a voltage input panel having a predetermined area of the resistive film as an orthogonal coordinate plane, and detecting a voltage at a position selected as an input coordinate on the resistive film. Thus, in the coordinate input device that detects the input coordinates, the resistive film is in a lattice shape composed of a vertical line extending in the Y-axis direction and a horizontal line extending in the X-axis direction, and the pitches of the vertical line and the horizontal line are the same. Or at least the horizontal line and the vertical line of the vertical line and the horizontal line, where the electrode for generating the potential distribution is not superimposed in the length direction, respectively, become smaller toward the center. Coordinate input apparatus characterized by being patterned into. 矩形状の基板と、この基板上に形成され、直交する電位分布が交互に発生される抵抗膜とを備え、この抵抗膜の所定の領域を直交座標面とする座標入力パネルを有し、前記抵抗膜上、入力座標として選択された位置の電圧を検出することにより、入力座標の検出を行う座標入力装置において、前記座標入力パネルは、前記抵抗膜の四隅に、前記電位分布を発生させるための駆動電圧が印加される駆動電圧印加用電極を設けると共に、前記抵抗膜上の周辺部、かつ、前記駆動電圧印加用電極間に、前記電位分布を発生させるための三角形ないし略三角形からなる電位分布発生用電極を間隙をもって、かつ、隣接するもの同士が１８０度ないし略１８０度回転させた関係となるように配列させていることを特徴とする座標入力装置。  A rectangular substrate and a resistive film formed on the substrate and alternately generating orthogonal potential distributions, and having a coordinate input panel having a predetermined region of the resistive film as an orthogonal coordinate plane, In a coordinate input device that detects input coordinates by detecting a voltage at a position selected as input coordinates on a resistive film, the coordinate input panel generates the potential distribution at the four corners of the resistive film. A drive voltage application electrode to which the drive voltage is applied is provided, and a potential composed of a triangle or a substantially triangle for generating the potential distribution between the periphery of the resistance film and between the drive voltage application electrodes. A coordinate input device characterized in that the distribution generating electrodes are arranged so as to have a gap and adjacent ones are rotated 180 degrees or approximately 180 degrees. 前記電位分布発生用電極は、大きさを同一ないし略同一とし、かつ、隣接するもの同士の間隙が中央部にいくに従って小さくなるように形成されていることを特徴とする請求項３記載の座標入力装置。  4. The coordinates according to claim 3, wherein the potential distribution generating electrodes have the same or substantially the same size, and are formed such that a gap between adjacent ones decreases toward the center. Input device. 前記電位分布発生用電極は、隣接するもの同士の間隙を同一ないし略同一とし、大きさが中央部にいくに従って大きくなるように形成されていることを特徴とする請求項３記載の座標入力装置。  4. The coordinate input device according to claim 3, wherein the potential distribution generating electrodes are formed such that the gaps between adjacent ones are the same or substantially the same, and the size increases toward the center. . 矩形状の基板と、この基板上に形成された抵抗膜と、この抵抗膜上の周辺部に枠状に形成され、直交する電位分布を前記抵抗膜に交互に発生させるための駆動電圧が四隅に印加される電位分布発生用電極とを備え、前記抵抗膜の所定の領域を直交座標面とする座標入力パネルを有してなる座標入力装置において、前記抵抗膜上、入力座標として選択された位置の電圧と、前記電位分布発生用電極の所定の位置の電圧とを検出して、前記抵抗膜上、入力座標として選択された位置の電圧と、前記電位分布発生用電極の所定の位置の電圧とから入力座標を検出する入力座標検出手段を備えていることを特徴とする座標入力装置。  A rectangular substrate, a resistance film formed on the substrate, and a frame formed around the resistance film in a frame shape, drive voltages for alternately generating an orthogonal potential distribution in the resistance film are provided at four corners. In a coordinate input device comprising a coordinate input panel having a predetermined region of the resistive film as an orthogonal coordinate plane, the voltage distribution generator is selected as an input coordinate on the resistive film. A voltage at a position and a voltage at a predetermined position of the potential distribution generation electrode are detected, and a voltage at a position selected as an input coordinate on the resistance film and a predetermined position of the potential distribution generation electrode are detected. A coordinate input device comprising input coordinate detecting means for detecting input coordinates from a voltage. 矩形状の基板と、この基板上に形成された抵抗膜と、この抵抗膜上の周辺部に枠状に形成され、直交する電位分布を前記抵抗膜に交互に発生させるための駆動電圧が四隅に印加される電位分布発生用電極とを備え、前記抵抗膜の所定の領域を直交座標面とする座標入力パネルを有し、前記抵抗膜上、入力座標として選択された位置の電圧を検出することにより、入力座標の検出を行う座標入力装置において、前記電位分布発生用電極の所定の位置の電圧を検出して、前記抵抗膜に発生する電位分布の直線性を高めるための駆動電圧を前記電位分布発生用電極の所定の位置に印加する電圧検出・駆動電圧発生手段を備えていることを特徴とする座標入力装置。  A rectangular substrate, a resistance film formed on the substrate, and a frame formed around the resistance film in a frame shape, drive voltages for alternately generating an orthogonal potential distribution in the resistance film are provided at four corners. And a voltage input panel having a predetermined area of the resistive film as an orthogonal coordinate plane, and detecting a voltage at a position selected as an input coordinate on the resistive film. Thus, in the coordinate input device that detects the input coordinates, the voltage at a predetermined position of the potential distribution generation electrode is detected, and the drive voltage for enhancing the linearity of the potential distribution generated in the resistance film is A coordinate input device comprising voltage detection / driving voltage generation means for applying a predetermined position of an electrode for potential distribution generation. 前記電位分布発生用電極の所定の位置の電圧を検出する手段として、前記電位分布発生用電極を構成する各辺の中央部ないし略中央部に、その先端を前記抵抗膜上に突出させ、かつ、前記抵抗膜に接触させた前記電位分布発生用電極よりも低抵抗の電圧検出用電極を備えていることを特徴とする請求項６又は７記載の座標入力装置。  As means for detecting the voltage at a predetermined position of the potential distribution generating electrode, the tip of the side of the side constituting the potential distribution generating electrode is protruded from the resistance film at the center or substantially the center, and The coordinate input device according to claim 6, further comprising a voltage detection electrode having a resistance lower than that of the potential distribution generation electrode brought into contact with the resistance film. 前記抵抗膜に対して一定の間隔をもって電圧検出用導電膜を対向させ、入力座標の選択は、前記電圧検出用導電膜の入力座標に対応する位置の前記抵抗膜との対向部分を前記抵抗膜に接触させることにより行い、入力座標の検出は、前記抵抗膜上、前記電圧検出用導電膜を介して入力座標として選択された位置の電圧を検出することにより行うように構成されていることを特徴とする請求項１、２、３、４、５、６、７又は８記載の座標入力装置。  The voltage detection conductive film is opposed to the resistance film at a predetermined interval, and the input coordinate is selected by selecting a portion of the resistance film at a position corresponding to the input coordinate of the voltage detection conductive film as the resistance film. The input coordinate is detected by detecting the voltage at the position selected as the input coordinate on the resistance film via the voltage detecting conductive film. The coordinate input device according to claim 1, 2, 3, 4, 5, 6, 7 or 8. 前記電圧検出用導電膜が前記抵抗膜に接触した場合に、前記電圧検出用導電膜側から前記抵抗膜側に電流を流し、この電流を検出することにより、前記電圧検出用導電膜が前記抵抗膜に接触したことを検出する電圧検出用導電膜接触検出手段と、この電圧検出用導電膜接触検出手段により前記電圧検出用導電膜が前記抵抗膜に接触したことが検出された場合に、前記駆動電圧を前記座標入力パネルに供給する駆動電圧供給手段とを備えていることを特徴とする請求項９記載の座標入力装置。  When the voltage detection conductive film is in contact with the resistance film, a current is passed from the voltage detection conductive film side to the resistance film side, and by detecting this current, the voltage detection conductive film becomes the resistance film. A voltage detecting conductive film contact detecting means for detecting contact with the film; and when the voltage detecting conductive film contact detecting means detects that the voltage detecting conductive film is in contact with the resistance film, The coordinate input device according to claim 9, further comprising drive voltage supply means for supplying a drive voltage to the coordinate input panel.
JP32200795A 1995-12-11 1995-12-11 Coordinate input device Expired - Lifetime JP3799639B2 (en)

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