JP3243701B2 - Interpolation method in coordinate detection device - Google Patents
Interpolation method in coordinate detection deviceInfo
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- JP3243701B2 JP3243701B2 JP18185693A JP18185693A JP3243701B2 JP 3243701 B2 JP3243701 B2 JP 3243701B2 JP 18185693 A JP18185693 A JP 18185693A JP 18185693 A JP18185693 A JP 18185693A JP 3243701 B2 JP3243701 B2 JP 3243701B2
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- signal
- electrode lines
- coordinate
- electrode
- tablet
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Description
【０００１】[0001]
【産業上の利用分野】本発明は、タブレット上に当接さ
れ、信号を発信する座標指示ペンの、静電容量結合方式
による、電極線がマトリクス状に配設されたタブレット
への当接位置情報をデジタル値で出力する座標検出装置
における、電極線間の座標を補間する方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrostatic capacitive coupling method of a coordinate pointing pen which contacts a tablet and emits a signal.
Detecting device that outputs, as digital values, the contact position information to the tablet in which the electrode wires are arranged in a matrix according to
And a method for interpolating coordinates between electrode lines .
【０００２】[0002]
【従来の技術】静電容量結合方式による信号送出型座標
指示ペンを使用した，Ｘ及びＹ座標軸に沿って（マトリ
クス状に）配設された複数の電極線を有するタブレット
座標検出装置において、疑似グランドを利用したケーブ
ル無しの（コードレスの）座標指示ペンを使用する場合
でも、またはケーブル付き（コード付き）座標指示ペン
を使用する場合でも、不平衡二信号伝達のための隣接電
極二本を同時使用した差動増幅器による、座標指示ペン
の位置に対する信号検出レベル特性曲線は二山特性を示
すが、この特性から補間法により精密な電極線間座標を
算出するに当たり従来は座標指示ペンに一番近い隣接二
電極線からの差信号レベルのみに主に注目した計算と補
正を行い電極線間の補間座標を出力していた。2. Description of the Related Art Signal transmission type coordinates by a capacitive coupling method
Along the X and Y coordinate axes using the pointing pen (matrix
In the tablet coordinate detection apparatus having a box shape) disposed a plurality of electrode lines, even when used without cable using a pseudo ground (cordless) coordinate pointing pen, or-out cable (corded) coordinates Even when the pointing pen is used , a coordinate pointing pen by a differential amplifier using two adjacent electrodes simultaneously for unbalanced two-signal transmission.
The characteristic curve of the signal detection level with respect to the position indicates a two-peak characteristic. In calculating the precise coordinate between the electrode lines by interpolation from this characteristic, conventionally, the difference signal level from the adjacent two-electrode line closest to the coordinate pointing pen is calculated. The calculation and correction mainly focused on only the above were performed, and the interpolation coordinates between the electrode lines were output.
【０００３】[0003]
【発明が解決しようとする課題】前記した従来の補間算
出手段では物理的各寸法及び電気回路の部品のバラツキ
及び制御部内回路の各信号の干渉などで座標出力の連続
性が隣接電極線の中間点で均一ではなかった。また更
に、電極線上位置での座標指示ペンの信号検出レベル特
性曲線の傾きが緩やかであり、ペン位置変化量に対する
信号検出レベル変化量が少なく、位置判定精度が他の位
置に比しＸ，Ｙ両方向とも低下していた。In the above-mentioned conventional interpolation calculating means, there are variations in physical dimensions and parts of electric circuits.
Also, the continuity of the coordinate output was not uniform at the midpoint between the adjacent electrode lines due to interference of signals in the control unit circuit . Furthermore, the slope of the signal detection level characteristic curve of the coordinate pointing pen on the electrode line position is moderate, for the pen position variation
The amount of change in the signal detection level was small, and the position determination accuracy was lower in both the X and Y directions than at other positions.
【０００４】[0004]
【課題を解決するための手段】本発明は従来の問題に鑑
みなされたもので、Ｘ及びＹ座標軸に沿って配設された
複数の電極線を有するタブレットと、該タブレットの電
極線と静電容量結合するスタイラス導体を先端部に配置
し、該スタイラス導体の先端部以外の殆どをシールド導
体で覆った座標指示ペンと、前記電極線の隣り合う二本
からの不平衡二信号を同時入力し順次切り換え接続し不
平衡二信号を同時出力するアナログマルチプレクサと、
該アナログマルチプレクサからの不平衡二信号出力を差
動入力する差動増幅器と、該差動増幅器の出力信号を印
加するバンドパスフィルタと、該バンドパスフィルタの
出力信号を印加する信号検出及び制御部とを有し、前記
スタイラス導体を正弦波，矩形波等の基本周波数が前記
バンドパスフィルタのパス周波数である交番信号電圧で
駆動し、前記タブレットの隣り合う二電極線毎の受信信
号の差のレベルを前記信号検出及び制御部で計測するこ
とによって、前記タブレットへの前記座標指示ペンの当
接位置座標を出力する座標検出装置において、Ｘ及びＹ
方向の前記当接位置座標を、該当接位置に最接近する二
電極線間でそれぞれ詳細に算定補間する方法であって、
前記計測値から前記当接座標を補間するにあたり、Ｘ方
向の場合は（Ｙ方向も同様であるが）Ｘ＝（ｄ／２）×
２．５（Ｓ23−Ｓ01）／（Ｓ23＋Ｓ01）により得る、前
記当接位置に最接近する二電極線の中間点からの近似補
間量Ｘ（正及び負の値を取りうる）を用い、またはこの
近似補間量Ｘを現物合わせによる補正特性で更に修正す
る手段を用いることにより、前記タブレットへの前記座
標指示ペンの電極線間当接位置座標を詳細に補間する補
間方法を提案するものである。但し、前記座標指示ペンがｎ＋１とｎ＋２番目の電極線間に有
り ｄは、電極線間隔 Ｓ01は、ｎとｎ＋１番目の電極線から得る、前記信号検
出及び制御部 での信号計測値 Ｓ23は、ｎ＋２とｎ＋３番目の電極線から得る、前記信
号検出及び制 御部での信号計測値 ｎは、正の整数 である。SUMMARY OF THE INVENTION The present invention has been made in view of the conventional problems, and has a tablet having a plurality of electrode wires arranged along X and Y coordinate axes, and a tablet having an electrode wire and an electrostatic wire. place the stylus conductor capacitively coupled to the distal portion, imbalance of most other than the tip portion of the stylus conductor and covered coordinate pointing pen shield conductor <br/> body, from two mutually Ri next to the electrode line An analog multiplexer that simultaneously inputs two signals, sequentially switches and connects them, and outputs unbalanced two signals simultaneously ;
Mark a differential amplifier, the output signal of the differential amplifier to the differential input unbalanced second signal output from the analog multiplexer
Band pass filter to be added , and the band pass filter
And a signal detection and control unit applies an output signal, the
The stylus conductor has a fundamental frequency
With the alternating signal voltage which is the pass frequency of the bandpass filter
Driven, by measuring the level of the difference between the received signal <br/> issue of each second electrode line mutually Ri next to the tablets by the signal detection and control unit, the contact position of the coordinate pointing pen to the tablet In a coordinate detection device that outputs coordinates, X and Y
The contact position coordinates in the direction
A method of calculating and interpolating in detail between electrode wires,
In interpolating the contact coordinates from the measured values , the X direction
For countercurrent (The same Y-direction but) X = (d / 2) ×
2.5 Obtained by (S23-S01) / (S23 + S01) , before
The approximate interpolation amount X (which can take positive and negative values) from the midpoint of the two electrode lines closest to the contact position is used, or the approximate interpolation amount X is further corrected by the correction characteristics based on actual matching.
That means Ri due to the use of, the seat of the said tablet
An interpolation method for interpolating the contact position coordinates between the electrode lines of the marker pointing pen in detail is proposed. However, the coordinate pointing pen is located between the n + 1 and n + 2 electrode lines.
Ri d is the electrode line spacing S01 is obtained from n and n + 1 th electrode line, wherein the signal detection
The signal measurement value S23 in the output and control section is obtained from the n + 2 and n + 3rd electrode lines.
No. signal measurement value n at the detection and control section is a positive integer.
【０００５】[0005]
【作用】座標指示ペンから二番目及び三番目に近い隣接
（組）電極線からの差信号検出レベルに注目した二レベ
ルから座標の補間計算を行うもので（一番目に近い隣接
（組）電極線からの検出差信号を補間計算に使用せ
ず）、上記二つの信号検出レベル特性により出来る２個
の近似三角形のどちらかを使用して補間計算するので、
信号レベルが零になることは無く、Ｓ／Ｎ比を含めて信
号の質が良く、またこの近似三角形は電極線上でも三角
形状をほぼ保持しているのでその位置でも補間精度が高
い。その後必要ならば、この補間量を更に現物合わせに
よる補正特性で修正して精密な補間値とする。[Function] The second and third nearest neighbors from the coordinate pointing pen
(Set) Interpolation calculation of coordinates from two levels focusing on the difference signal detection level from the electrode line (the nearest neighbor
(Set) Use the detection difference signal from the electrode wire for interpolation calculation.
Not), since the interpolation is calculated using either of the two approximate triangles that can by the two signal detection level characteristics,
The signal level does not become zero and the signal level including the S / N ratio is
The quality of the signal is good.
Interpolation accuracy is high even at that position because the shape is almost retained
No. Then, if necessary, further adjust this interpolation amount
Corrected by the correction characteristics according to the above , to obtain a precise interpolation value .
【０００６】[0006]
【実施例】以下本発明の詳細を添付図を参照して説明す
る。図１は疑似グランドを利用した装置の場合の構成図
を兼ねた電気信号系統図である。装置本体と直接接続さ
れていない（ケーブル無しの）座標指示ペン２内部に能
動回路の正弦波発生器（または矩形波発生器等）３が配
置され連続した正弦波等電圧を発生し、座標指示ペン２
の外周導体（シールド導体）１３を基準とする不平衡信
号電圧を座標指示ペン２の先端部のスタイラス導体５へ
印加する。電源部としての電池４はペン２内部へ動作電
力を供給する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an electric signal system diagram that also serves as a configuration diagram in the case of a device using a pseudo ground. Directly connected to the main unit
A sine wave generator (or a rectangular wave generator or the like) 3 of an active circuit is disposed inside the undesignated (no cable) coordinate pointing pen 2 to generate a continuous sine wave equal voltage, and the coordinate pointing pen 2
An unbalanced signal voltage based on the outer conductor (shield conductor) 13 is applied to the stylus conductor 5 at the tip of the coordinate pointing pen 2. A battery 4 as a power supply supplies operation power to the inside of the pen 2 .
【０００７】座標指示ペン２の先端部のスタイラス導体
５はタブレット１の盤面近くにある時、タブレット１の
各電極線７，７，７，・・・と小容量の静電容量結合す
ることになる。また、座標指示ペン２の外周導体１３は
装置本体グランドとの浮遊容量により、また操作者の人
体を通じ、また電磁波放射インピーダンスの効果等によ
り疑似グランド（疑似接地）と見なす事が出来、図１に
於て疑似グランドインピーダンス（Ｚｐ）６として図示
してある。従って座標指示ペン２内部で発生した連続正
弦波等信号は、疑似グランドインピーダンス６を信号リ
ターン経路として前記静電容量結合を通じて、各電極線
７，７，７，・・・へ結合容量の大きさに従ったレベル
でそれぞれ伝わる。When the stylus conductor 5 at the tip of the coordinate pointing pen 2 is near the board surface of the tablet 1, the stylus conductor 5 is coupled to each of the electrode wires 7 , 7 , 7 , 7,. Become. The outer conductor 13 of the coordinate pointing pen 2 can be regarded as a pseudo ground (pseudo ground) due to the stray capacitance with the apparatus body ground, through the human body of the operator, and due to the effect of electromagnetic wave radiation impedance and the like. Here, it is shown as a pseudo ground impedance (Zp) 6. Therefore, a signal such as a continuous sine wave generated inside the coordinate pointing pen 2 is connected to each of the electrode lines 7 , 7, 7,... Through the capacitive coupling using the pseudo ground impedance 6 as a signal return path. It is transmitted at the level according to.
【０００８】Ｘ方向及びＹ方向アナログマルチプレクサ
８及び９は各電極線７，７，７，・・・の隣り合う二電
極線をペアー（組）としながら順次切り換えて、隣接二
電極線の不平衡二信号を差動増幅器１０の＋端子及び一
端子へそれぞれ同時に印加する。この差動増幅器１０の
出力信号は＋端子及び一端子の二入力信号の差のみ増幅
され、外乱コモンモードノイズ成分とか電源ノイズ等の
同相同レベル成分が除去されて、バンドパスフィルタ１
１へ印加される。バンドパスフィルタ１１は正弦波等信
号発生器３の基本波成分を通過させそれ以外の周波数成
分を阻止し、信号伝達経路の途中で混入するデジタルノ
イズ、回路素子の発生するノイズ等のランダム性ノイズ
を減衰させ、必要信号の周波数及びその近傍周波数成分
のみ有効に通過させる。バンドパスフィルタ１１の出力
は信号検出及び制御部１２へ印加される。[0008] X and Y directions the analog multiplexer 8 and 9 each electrode line 7, 7, 7, the second electrode lines mutually Ri next to ... are sequentially switched with a pair (set), the adjacent second electrode lines not The two balanced signals are simultaneously applied to the + terminal and one terminal of the differential amplifier 10, respectively. The output signal of the differential amplifier 10 is amplified only by the difference between the two input signals of the + terminal and one terminal, and the same homologous level components such as disturbance common mode noise components and power supply noise are removed, and the band pass filter is removed. 1
1 is applied. The band-pass filter 11 allows the fundamental wave component of the sine wave equal signal generator 3 to pass through and passes other frequency components.
Prevents min, digital noise mixed in the middle of the signal transmission path, the random noise such as noise generated by the circuit elements
The attenuated, Ru passed effectively only the frequency and near the frequency components thereof of the required signal. The output of the bandpass filter 11 is applied to a signal detection and control unit 12.
【０００９】以上述べた図１の構成による静電容量結合
方式の座標検出装置において、この信号伝達手段の特徴
は本願出願人の出願になる特願平５−１２３６０１号
（座標検出装置）に詳述してあるのでここでは詳細には
述べないが、本質的に外乱の影響を略完全に除去できる
信号伝達手段である。Ｘ及びＹ方向アナログマルチプレ
クサ８及び９は、１番目の電極線７と２番目の電極線７
を、次に２番目と３番目の電極線７を、次に３と４番目
の電極線７を、・・・・・、それぞれペアー（組）とし
て、順次切り換え接続していく。Ｘ方向及びＹ方向は時
分割で接続される。今、例えばＸ方向の、５と６番目の
隣接組電極線７にアナログマルチプレクサ８を固定し
て、座標指示ペン先端部スタイラス導体５のタブレット
１上の位置をＸ方向に移動したときの、信号検出及び制
御部１２における信号検出レベル（位相を無視した絶対
値電圧）特性は、ペン２からの信号を隣接二電極線で受
信し、その差成分のみ検出するが故に、５と６番目の電
極線の中間位置でディップした 左右対称の二つ山のある
特性である。ディップ点を境にして、検出信号の位相は
π（ラジアン）シフト（反転）するが、本出願では位相
を検出しない〔信号レベル〕による補間法を要旨とす
る。ちなみに、従来は、ほぼ零にもなる信号レベルの、
更にその点で位相が大きく変化する検出信号を使用した
補間であり、精度低下の要因であった。ペン２から信号
検出及び制御部１２までのすべての回路が、線形性のあ
る回路であるため、隣接（組）電極線７が受信する二信
号の差電圧と、信号検出及び制御部１２における信号検
出レベルは比例する。The characteristics of the signal transmission means in the above-described coordinate detecting device of the capacitive coupling type having the configuration shown in FIG. 1 are described in detail in Japanese Patent Application No. 5-123601 (coordinate detecting device) filed by the present applicant. Although not described in detail here because it has been described, the signal transmission means can essentially completely eliminate the influence of disturbance. X and Y direction analog multiple
Wedges 8 and 9 are the first electrode wire 7 and the second electrode wire 7
And then the second and third electrode wires 7, and then the third and fourth electrode wires 7.
The electrode wire 7 is a pair.
And switch connection sequentially. X and Y directions are hours
Connected in split. Now, for example, the 5th and 6th in the X direction
An analog multiplexer 8 is fixed to the adjacent set electrode line 7
And the tablet of the stylus conductor 5 at the tip of the coordinate pointing pen
1. Signal detection and control when the upper position is moved in the X direction
Signal detection level (absolute value ignoring phase)
Value voltage) characteristic is that the signal from pen 2 is received by two adjacent electrode lines.
And only the difference component is detected.
There is a bilaterally symmetrical dip at the midpoint of the polar line
It is a characteristic. Starting from the dip point, the phase of the detection signal is
π (radian) shift (inversion), but in this application
The gist is an interpolation method using [signal level] that does not detect
You. By the way, conventionally, the signal level of almost zero,
Furthermore, a detection signal whose phase changes greatly at that point was used.
Interpolation, which was the cause of the decrease in accuracy. Signal from pen 2
All circuits up to the detection and control unit 12 have linearity.
Circuit that is connected to the
Signal difference and signal detection and control unit 12 signal detection.
The outgoing level is proportional .
【００１０】次に信号検出及び制御部１２に於て行われ
る、本発明の特徴である信号レベルによる電極線間座標
補間について説明する。信号の位相を無視した絶対値に
よる検出レベルと、座標指示ペン２の先端部スタイラス
導体５のタブレット１のＸ軸上位置（Ｙ軸上位置に対し
ても同様）に関する特性曲線は図２に示すが、前述のよ
うに選択（固定）された二電極線の中心点でディップし
た左右対称の二つ山のある特性である。特性曲線２０は
ｎを任意番目の電極線７としてｎとｎ＋１番目の電極線
７による信号検出レベル特性であり、特性曲線２１はｎ
＋１とｎ＋２番目の電極線７による特性であり、特性曲
線２２はｎ＋２とｎ＋３番目の電極線７による特性であ
る。実動状態では、ペン２の先端位置が（ほぼ）固定さ
れており、その座標を求めることになる。 Next, the coordinate between the electrode lines based on the signal level, which is a feature of the present invention, is performed in the signal detection and control unit 12.
The interpolation will be described. FIG. 2 shows a characteristic level regarding the detection level based on the absolute value ignoring the signal phase and the position of the stylus conductor 5 at the tip of the coordinate pointing pen 2 on the X-axis of the tablet 1 (the same applies to the position on the Y-axis). But I mentioned earlier
This is a characteristic having two symmetrical peaks that are dipped at the center point of the selected (fixed) two electrode lines. A characteristic curve 20 is a signal detection level characteristic by n and the (n + 1) th electrode lines 7 where n is an arbitrary electrode line 7, and a characteristic curve 21 is n
The characteristic curve 22 is the characteristic of the (n + 1) th and (n + 3) th electrode lines 7, and the characteristic curve 22 is the characteristic of the (n + 2) th and (n + 3) th electrode lines 7. In the actual operating state, the tip position of the pen 2 is (almost) fixed.
And the coordinates are determined.
【００１１】計算を容易にするためと、なるべく実際に
近い結果を得るために、図３に示す直線近似特性で考え
る。座標指示ペン先端部スタイラス導体５のタブレット
１上の位置（当接座標）が図３に示す位置にある場合、
図示するＳ01,Ｓ12,Ｓ23,等の信号検出レベル（計測
値）を得る。これらの計測値からペン２の当接座標を求
める。これらＳ01,Ｓ12,Ｓ23,等の計測値から当接座標
がｎ＋１番目の電極線７とｎ＋２番目の電極線７との間
にあることは自明であると思われるのでその説明は省略
する。当接座標がｎ＋１番目の電極線７とｎ＋２番目の
電極線７との間のどの位置にあるかを、補間法で求め
る。本出願において、図３の斜線で示す三角形ＡＢＣ
（及び三角形ＡＤＥ）に着目した。Ｓ23及びＳ01の検出
信号レベル差（図３でのＳ23点及びＳ01点間の距離）と
Ｃ及びＢ点間の距離との比は、Ｘ（近似 補間量を意味す
る）と隣接電極線の間隔（距離）の１／２との比に等し
い。また、Ｃ及びＢ点間の距離（ｎ＋２番目の電極線７
上での近似特性３２及び３０に従った検出信号のレベル
差）は、タブレット１の構造上の各寸法とか使用材質の
誘電率などにより差はあるが、おおよそ、三角形ＡＢＣ
の平均的レベル（つまり（Ｓ23＋Ｓ01）／２）の０．８
倍であることが多くの実験の結果判明した。これらの関
係をまとめると、 Ｘ＝（ｄ／２）×２．５（Ｓ23−Ｓ01）／（Ｓ23＋Ｓ01）・・・〔式１〕 を得る 。但し、前記座標指示ペンがｎ＋１とｎ＋２番目の電極線間に有
り ｄは、隣接電極線の間隔 Ｓ01は、ｎとｎ＋１番目の電極線による信号検出レベル Ｓ23は、ｎ＋２とｎ＋３番目の電極線による信号検出レ
ベルｎは、正の整数 である。この近似補間量を更に、（より詳細な補間が必
要なら）それぞれの構造寸法などの差及び近似折れ線特
性を使用した事による差などを、現物合わせによる補正
特性で修正して正確な補間量が求まる。また、座標指示
ペン２の先端部スタイラス導体５の位置が電極線間の左
側半区間上にある場合は、電極線間の中間点から左方向
（負方向）であり、〔式１〕の結果をそのまま使用出来
る（〔式１〕の値が負になる）。Ｙ軸についても全く同
様の方法で補間する。前述の様に該回路が線形性を有す
ることから、また、〔式１〕の各部ディメンジョンか
ら、システムの信号増幅度及びペン２の出力電圧に無関
係な補間法である事が分かる。信号検出及び制御部１２
は上記の線間補間を行いＸ及びＹ座標を決定してデジタ
ル出力する。[0011] To make the calculation easier,
In order to obtain a close result , consider the linear approximation characteristics shown in FIG. Tablet of stylus conductor 5 for coordinate pointing pen tip
1. If the position (contact coordinate) on 1 is at the position shown in FIG.
The signal detection levels of S01, S12, S23, etc.
Value). The contact coordinates of pen 2 are calculated from these measured values.
Confuse. From these measured values of S01, S12, S23, etc., the contact coordinates
Is between the (n + 1) th electrode line 7 and the (n + 2) th electrode line 7
Seems to be obvious, so the explanation is omitted.
I do. The contact coordinates are the (n + 1) th electrode line 7 and the (n + 2) th
The position between the electrode line 7 is determined by interpolation.
You. In the present application, a triangle ABC indicated by hatching in FIG.
(And triangle ADE) . Detection of S23 and S01
The signal level difference (distance between points S23 and S01 in FIG. 3) and
The ratio between the distance between the points C and B is X ( meaning the approximate interpolation amount).
) And 1/2 of the distance (distance) between adjacent electrode wires
No. The distance between the points C and B (the (n + 2) th electrode line 7
The level of the detection signal according to the above approximate characteristics 32 and 30
Difference) indicates the structural dimensions of the tablet 1 or the material used.
Although there is a difference depending on the dielectric constant, etc., roughly, the triangle ABC
0.8 of the average level (that is, (S23 + S01) / 2)
Many experiments have shown to be double. These functions
In summary, X = (d / 2) × 2.5 (S23−S01) / (S23 + S01) ( Equation 1 ) is obtained . However, the coordinate pointing pen is located between the n + 1 and n + 2 electrode lines.
Ri d, the distance S01 between adjacent electrode lines has n and n + 1 th signal detection level S23 by the electrode lines, n + 2 and n + 3-th electrode line by the signal detection level n is Ru positive integer der. The approximate interpolation amount further, (a more detailed interpolation必
(If necessary) Differences in each structural dimension etc. and approximate broken line characteristics
The difference due to the use of the characteristic is corrected by the correction characteristic based on the actual matching , and the accurate interpolation amount is obtained. Further, if the position of the tip portion stylus conductor 5 of the coordinate instruction <br/> pen 2 is on the left half section between the electrode line, a left from the midpoint between the electrode line (negative direction), [Formula 1) can be used as is
(The value of [Equation 1] becomes negative) . Interpolation is performed in exactly the same way for the Y axis . The circuit has linearity as described above
Therefore, the dimensions of [Equation 1]
Independent of the signal amplification of the system and the output voltage of pen 2.
It can be seen that this is a relevant interpolation method. Signal detection and control unit 12
Performs the above-described inter-line interpolation to determine the X and Y coordinates and digitally outputs the X and Y coordinates.
【００１２】尚、従来方式により求めた補間量と本方式
により求めた補間量とを併用し、二者の平均を取るこ
と、または重み付け平均を取ること、または区間分けし
て従来方式と本方式による補間量を使い分ける、等の方
法もあることは言うまでもない。更にケーブル付座標指
示ペン（疑似グランドを利用する必要がなくケーブルの
内の一本線を信号リターンとする）を使用した装置（図
示せず）に於ても、座標指示ペンの先端部のスタイラス
導体からタブレットの隣接電極線に伝わる不平衡二信号
を差動増幅しレベル検出した特性曲線は全く図２に示す
特性曲線と同等であり、本補間方式をそのまま使用出来
る。また印加する信号として主に正弦波信号で説明した
が、繰り返し周期を持つ交番信号であれば採用できるも
のである。It should be noted that the interpolation amount obtained by the conventional method and the interpolation amount obtained by the present method are used together to take an average of the two, or to obtain a weighted average, or to divide the section into two sections, thereby obtaining the conventional method and the present method. It is needless to say that there is a method of selectively using the interpolation amount according to. Coordinate finger with cable
In a device (not shown) using an indicator pen (not using a pseudo ground and using one of the cables as a signal return), the stylus conductor at the tip of the coordinate pointing pen is adjacent to the tablet. The characteristic curve obtained by differentially amplifying the two unbalanced signals transmitted to the electrode lines and detecting the level is exactly the same as the characteristic curve shown in FIG. 2, and the present interpolation method can be used as it is. Although the description has been made mainly of the sine wave signal as the signal to be applied, any alternating signal having a repetition period can be employed.
【００１３】[0013]
【発明の効果】以上説明したように本方式の補間法で
は、特性曲線のうち直線性の良い部分を使用しているた
め、近似値そのものが、さらなる補正の必要がない位に
実際の位置座標に近く、また電極線の中間点の検出座標
の連続性も良く信頼度の高い座標出力結果が得られた。As described above, in the interpolation method according to the present method, since the portion having a good linearity is used in the characteristic curve, the approximate value itself is reduced to the actual position coordinates where no further correction is required. And the continuity of the detected coordinates of the middle point of the electrode line was good, and a highly reliable coordinate output result was obtained.
【図１】 本補間法を使用する一装置の構成図を兼ねた
電気信号系統図FIG. 1 is an electrical signal system diagram that also serves as a configuration diagram of one device that uses this interpolation method.
【図２】 信号検出レベル特性図FIG. 2 is a signal detection level characteristic diagram
【図３】 補間計算用折れ線近似検出レベル図FIG. 3 is a broken line approximation detection level diagram for interpolation calculation
１ タブレット ２ 座標指示ペン ３ 正弦波，矩形波等の信号発生器 ４ 電池 ５ 座標指示ペン先端部のスタイラス導体 ６ 疑似グランドインピーダンス ７ 電極線（複数） ８ Ｘ方向アナログマルチプレクサ ９ Ｙ方向アナログマルチプレクサ １０ 差動増幅器 １１ バンドパスフィルタ １２ 信号検出及び制御部 １３ 座標指示ペンの外周導体（シールド導体） ２０ ｎとｎ＋１番目の電極線による信号検出レベル特
性 ２１ ｎ＋１とｎ＋２番目の電極線による信号検出レベ
ル特性 ２２ ｎ＋２とｎ＋３番目の電極線による信号検出レベ
ル特性 ３０ ｎとｎ＋１番目の電極線に対する折れ線近似特性 ３１ ｎ＋１とｎ＋２番目の電極線に対する折れ線近似
特性 ３２ ｎ＋２とｎ＋３番目の電極線に対する折れ線近似
特性REFERENCE SIGNS LIST 1 tablet 2 coordinate pointing pen 3 signal generator for sine wave , rectangular wave, etc. 4 battery 5 stylus conductor at tip of coordinate pointing pen 6 pseudo ground impedance 7 electrode wires (plural) 8 X direction analog multiplexer 9 Y direction analog multiplexer 10 difference Dynamic amplifier 11 Band pass filter 12 Signal detection and control unit 13 Outer conductor (shield conductor) of coordinate pointing pen 20 Signal detection level characteristics by n and n + 1st electrode lines 21 Signal detection level characteristics by n + 1 and n + 2nd electrode lines 22 Signal detection level characteristics with n + 2 and n + 3rd electrode lines 30 Polygonal line approximation characteristics for n and n + 1th electrode lines 31 Polygonal line approximation characteristics for n + 1 and n + 2nd electrode lines 32 Polygonal line approximation characteristics for n + 2 and n + 3rd electrode lines
Claims (2)
の電極線を有するタブレットと、該タブレットの電極線
と静電容量結合するスタイラス導体を先端部に配置し、
該スタイラス導体の先端部以外の殆どをシールド導体で
覆ったコードレス座標指示ペンと、前記電極線の隣り合
う二本からの不平衡二信号を同時入力し順次切り換え接
続し不平衡二信号を同時出力するアナログマルチプレク
サと、該アナログマルチプレクサからの不平衡二信号出
力を差動入力する差動増幅器と、該差動増幅器の出力信
号を印加するバンドパスフィルタと、該バンドパスフィ
ルタの出力信号を印加する信号検出及び制御部とを有
し、前記座標指示ペン内部に、一端が前記スタイラス導
体へ接続され他端が前記シールド導体へ接続された正弦
波，矩形波等の、基本周波数が前記バンドパスフィルタ
のパス周波数である交番信号発生器と、該交番信号発生
器へ動作電力を供給する電源部とが配設され、前記タブ
レットの隣り合う二電極線毎の受信信号の差のレベルを
前記信号検出及び制御部で計測することによって、前記
タブレットへの前記座標指示ペンの当接位置座標を出力
する座標検出装置において、Ｘ及びＹ方向の前記当接位
置座標を、該当接位置に最接近する二電極線間でそれぞ
れ詳細に算定補間する方法であって、前記計測値から前
記当接座標を補間するにあたり、Ｘ方向の場合は（Ｙ方
向も同様であるが） Ｘ＝（ｄ／２）×２．５（Ｓ23−Ｓ01）／（Ｓ23＋Ｓ01）により得る、前記当接位置に最接近する二電極線の中間
点からの 近似補間量Ｘ（正及び負の値を取りうる）を用
い、またはこの近似補間量Ｘを現物合わせによる補正特
性で更に修正する手段を用いることにより、前記タブレ
ットへの前記座標指示ペンの電極線間当接位置座標を詳
細に補間する補間方法。但し、前記座標指示ペンがｎ＋１とｎ＋２番目の電極線間に有
り ｄは、電極線間隔 Ｓ01は、ｎとｎ＋１番目の電極線から得る、前記信号検
出及び制御部 での信号計測値 Ｓ23は、ｎ＋２とｎ＋３番目の電極線から得る、前記信
号検出及び制 御部での信号計測値 ｎは、正の整数 である。1. A tablet having a plurality of electrode lines disposed along X and Y coordinate axes, and a stylus conductor that is capacitively coupled to the electrode lines of the tablet is disposed at a tip end thereof.
Most and covered cordless coordinate pointing pen a shield conductor other than the tip of the stylus conductor, and simultaneously inputted sequentially switching connections unbalanced second signal from the neighboring Ri case <br/> Cormorants two of said electrode lines not an analog multiplexer for simultaneously outputting a balanced binary signal, output an unbalanced second signal from the analog multiplexer
A differential amplifier for differentially inputting power, and an output signal of the differential amplifier.
A band-pass filter for applying the item, the band-pass Fi
And a signal detection and control unit for applying the output signal of filter, the inside coordinate pointing pen, one end the sine wave and the other end connected to the stylus conductor is connected to the shield conductor, a rectangular wave or the like, The fundamental frequency is the bandpass filter
Of the alternating signal generator is a path frequencies, and a power supply unit for supplying operating power to the alternating signal generator is provided, the level difference of the received signal for each second electrode line mutually Ri next to the tablet
A coordinate detection device that outputs coordinates of a contact position of the coordinate pointing pen to the tablet by measuring the signal detection and control unit , wherein the contact position in the X and Y directions is
Position coordinates between the two electrode lines closest to the tangent position.
Is a method of calculating interpolated in detail, before the said measured value
When interpolating the abutment coordinates , in the case of the X direction (Y direction
Direction is also the same) obtained by X = (d / 2) × 2.5 (S23-S01) / (S23 + S01), the intermediate second electrode lines closest to said contact position
Using the approximate interpolation amount X (it can take positive and negative values) from the point, or correct the approximate interpolation amount X in kind alignment JP
Ri by the using means further modified sex, the inter-coordinate pointing pen electrode line interpolation method for abutting position coordinates in detail interpolation to the tablet. However, the coordinate pointing pen is located between the n + 1 and n + 2 electrode lines.
Ri d is the electrode line spacing S01 is obtained from n and n + 1 th electrode line, wherein the signal detection
The signal measurement value S23 in the output and control section is obtained from the n + 2 and n + 3rd electrode lines.
No. signal measurement value n at the detection and control section is a positive integer.
の電極線を有するタブレットと、該タブレットの電極線
と静電容量結合するスタイラス導体を先端部に配置さ
れ、該スタイラス導体の先端部以外の殆どをシールド導
体で覆われ、装置本体とケーブルで接続された（コード
付き）座標指示ペンと、前記電極線の隣り合う二本から
の不平衡二信号を同時入力し順次切り換え接続し不平衡
二信号を同時出力するアナログマルチプレクサと、該ア
ナログマルチプレクサからの不平衡二信号出力を差動入
力する差動増幅器と、該差動増幅器の出力信号を印加す
るバンドパスフィルタと、該バンドパスフィルタの出力
信号を印加する信号検出及び制御部とを有し、前記スタ
イラス導体を正弦波，矩形波等の基本周波数が前記バン
ドパスフィルタのパス周波数である交番信号電圧で駆動
し、前記タブレットの隣り合う二電極線毎の受信信号の
差のレベルを前記信号検出及び制御部で計測することに
よって、前記タブレットへの前記座標指示ペンの当接位
置座標を出力する座標検出装置において、Ｘ及びＹ方向
の前記当接位置座標を、該当接位置に最接近する二電極
線間でそれぞれ詳細に算定補間する方法であって、前記
計測値から前記当接座標を補間するにあたり、Ｘ方向の
場合は（Ｙ方向も同様であるが） Ｘ＝（ｄ／２）×２．５（Ｓ23−Ｓ01）／（Ｓ23＋Ｓ01） により得る、前記当接位置に最接近する二電極線の中間
点からの近似補間量Ｘ（正及び負の値を取りうる）を用
い、またはこの近似補間量Ｘを現物合わせによる補正特
性で更に修正する手段を用いることにより、前記タブレ
ットへの前記座標指示ペンの電極線間当接位置座標を詳
細に補間する 補間方法。但し、 前記座標指示ペンがｎ＋１とｎ＋２番目の電極線間に有
り ｄは、電極線間隔 Ｓ01は、ｎとｎ＋１番目の電極線から得る、前記信号検
出及び制御部 での信号計測値 Ｓ23は、ｎ＋２とｎ＋３番目の電極線から得る、前記信
号検出及び制 御部での信号計測値 ｎは、正の整数 である。 2. A tablet having a plurality of electrode lines arranged along X and Y coordinate axes, and a stylus conductor which is capacitively coupled to the electrode lines of the tablet is disposed at a tip end.
Most of the stylus conductor is shielded except for the tip.
Covered with a body and connected to the main unit with a cable (cord
Attached) and the coordinate pointing pen, an analog multiplexer for simultaneous output simultaneously enter sequentially switching connections to the unbalanced second signal unbalanced second signal from two mutually Ri next to the electrode lines, unbalanced second from the analog multiplexer A differential amplifier for differentially inputting a signal output , and applying an output signal of the differential amplifier .
It has a band-pass filter that, the signal detection and control unit applies the output <br/> signal of the band-pass filter, the static
When the fundamental frequency such as a sine wave or a square wave is
Driven by alternating signal voltage, which is the pass frequency of the pass filter
And, by measuring the level of the difference between the received signal of each second electrode line mutually Ri next to the tablets by the signal detection and control unit, a coordinate detector for outputting a contact position coordinates of the coordinate pointing pen to the tablet X and Y directions in the device
The contact position coordinates of the two electrodes closest to the contact position
A method for calculating and interpolating between lines in detail, wherein
In interpolating the contact coordinates from the measured values,
In this case (the same applies to the Y direction), X = (d / 2) × 2.5 (S23−S01) / (S23 + S01) , which is the middle of the two electrode lines closest to the contact position.
Using the approximate interpolation amount X (possible positive and negative values) from the point
Or the approximate interpolation amount X is
By using the means for further correction in nature,
The coordinates of the contact position between the electrode lines of the coordinate pointing pen
Interpolation method for fine interpolation . However, the coordinate pointing pen is located between the n + 1 and n + 2 electrode lines.
Ri d is the electrode line spacing S01 is obtained from n and n + 1 th electrode line, wherein the signal detection
The signal measurement value S23 at the output and control unit is obtained from the n + 2 and n + 3rd electrode wires.
No. signal measurement value n at the detection and control section is a positive integer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18185693A JP3243701B2 (en) | 1993-06-28 | 1993-06-28 | Interpolation method in coordinate detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18185693A JP3243701B2 (en) | 1993-06-28 | 1993-06-28 | Interpolation method in coordinate detection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0713681A JPH0713681A (en) | 1995-01-17 |
| JP3243701B2 true JP3243701B2 (en) | 2002-01-07 |
Family
ID=16108034
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18185693A Expired - Lifetime JP3243701B2 (en) | 1993-06-28 | 1993-06-28 | Interpolation method in coordinate detection device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3243701B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB0213237D0 (en) * | 2002-06-07 | 2002-07-17 | Koninkl Philips Electronics Nv | Input system |
| TWI430156B (en) * | 2008-09-09 | 2014-03-11 | Alps Electric Co Ltd | Coordinate input device |
| KR101995403B1 (en) * | 2012-09-14 | 2019-07-02 | 삼성전자 주식회사 | Stylus pen, electroinic device and method for processing input using it |
| US9645666B2 (en) | 2012-11-22 | 2017-05-09 | Sharp Kabushiki Kaisha | Display device with touch panel attached |
-
1993
- 1993-06-28 JP JP18185693A patent/JP3243701B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0713681A (en) | 1995-01-17 |
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