JP3240760B2 - Interpolation method in coordinate detection device - Google Patents
Interpolation method in coordinate detection deviceInfo
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- JP3240760B2 JP3240760B2 JP18185593A JP18185593A JP3240760B2 JP 3240760 B2 JP3240760 B2 JP 3240760B2 JP 18185593 A JP18185593 A JP 18185593A JP 18185593 A JP18185593 A JP 18185593A JP 3240760 B2 JP3240760 B2 JP 3240760B2
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- signal
- electrode
- electrode lines
- coordinate
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Description
【０００１】[0001]
【産業上の利用分野】本発明は、信号を発信するケーブ
ル無し座標指示ペンの、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 electrode of a coordinate pointing pen without a cable for transmitting a signal, which is provided by a capacitive coupling method.
In the coordinate detecting device lines to output the contact position information to a tablet arranged in a matrix in a digital value, electrostatic
The present invention relates to a method for interpolating coordinates between polar lines .
【０００２】[0002]
【従来の技術】装置本体と直接接続されていない、ケー
ブル無しの、能動的に信号を発信する静電容量結合方式
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は、平衡一信号伝達のための
隣接電極二本を同時使用する平衡不平衡変換による場
合、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あ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一つの信号レベルのみに
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 Capacitively-coupled system which is not directly connected to a device body and which does not have a cable and which actively transmits signals.
Using the coordinate pointing pen , along the X and Y coordinate axes (ma
In a tablet coordinate detecting device having a plurality of electrode lines arranged in a trix-like manner, a coordinate-unbalance conversion using two adjacent electrodes simultaneously for balanced-one signal transmission requires a coordinate system. the signal detection level characteristic curve with respect to the position of the indicating pen shows a two-peak characteristic, one from the nearest adjacent second electrode lines prior to the coordinate indicating pen in calculating a precise electrode line between coordinate by interpolation from the characteristic The calculation and correction mainly focused on only one signal level were performed to output the interpolation coordinates between the electrode lines .
【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、物理的各部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等で座標出力の連
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
性曲線の傾きがゆるやかであり、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-described conventional interpolation calculating means, the continuity of the coordinate output is reduced by the variation of the physical parts and the variation of the components of the electric circuit and the interference of each signal of the circuit in the control section . It was not uniform at the midpoint. Further on the electrode line position, a gradual inclination of the signal detection level characteristic curve of the coordinate pointing pen, less signal detection level variation with respect to the pen position change amount, X compared position determination accuracy to another location, It decreased in both Y directions .
【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
極線とそれぞれ静電容量結合する二つの導体を先端部に
配設した座標指示ペンと、前記電極線の隣り合う二本
（隣接電極線）からの信号を平衡入力し順次切り換え接
続し二線平衡信号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平衡信号を不平衡信号
に変換する平衡不平衡変換器と、該平衡不平衡変換器か
らの不平衡信号を印加されるバンドパスフィルタと、該
バンドパスフィルタを介して信号を印加される信号検出
及び制御部とを有し、前記座標指示ペン内部に電源部
と、前記二つの導体へ平衡接続された正弦波，矩形波等
の、基本波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が配置され、前記電極線の各
隣接電極線毎の平衡信号電圧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事により、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 lines arranged along X and Y coordinate axes, and a tablet having a plurality of electrode lines. two coordinate pointing pen which is disposed at the tip of the two conductors, mutually Ri next to the electrode wire binding capacity
An analog multiplexer for balanced input of signals from (adjacent electrode lines), sequentially switching and connecting and outputting a two-wire balanced signal;
A balanced-to-unbalanced converter for converting the balanced signal from the analog multiplexer into an unbalanced signal, a band-pass filter to which the unbalanced signal from the balanced-to-unbalanced converter is applied, and a signal passed through the band-pass filter. and a signal detection and control unit applied, and the coordinate pointing pen inside the power supply unit, the two balanced connection sinewave to conductors, a rectangular wave or the like, the fundamental wave frequency path of the band-pass filter frequency
Are arranged alternately with the signal generator is a number, a balanced signal voltage level for each <br/> adjacent electrode lines of the electrode line the signal detection and
By measuring the control unit, prior to the tablet
A coordinate detecting device for outputting a contact position coordinate of a coordinate pointing pen, wherein the contact position coordinates in the X and Y directions are determined by the corresponding contact.
Detailed calculation and interpolation between the two electrode lines closest to the position
When the contact coordinates are interpolated from the measured values , in the case of the X direction (the same applies to the Y direction).
X ) = (d / 2) × 2.5 (S23−S01) / (S23 +
The two-electrode wire closest to the contact position, obtained by S01)
The approximate interpolation amount X from the intermediate point of (take positive and negative values
That) was used, or the approximate interpolation amount X to the actual alignment
That Ri by further be used means for modifying the correction characteristics and proposes an interpolation method for the coordinate inter pointing pen electrode wire contact 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.
【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) from the two-level focused on the signal detection level from the electrode lines to perform interpolation calculation of the coordinates (adjacent close to a first
(Set) The detection signal from the electrode wire is not used for interpolation calculation) ,
Since the interpolation is calculated using either of the two approximate triangles that can by the two signal detection level characteristics, signal Les
The bell does not become zero and the signal quality including the S / N ratio
This approximate triangle has a triangular shape even on the electrode line.
Since it is almost held, the interpolation accuracy is high even at that position . Thereafter, if necessary, this interpolation amount is further corrected with a correction characteristic based on actual matching 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は平衡信号伝達手段を利用した装置の構成図を
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する。この正弦波等発
生器３の平衡出力は座標指示ペン２の先端部の二つの導
体としてのスタイラス導体５及びこれを囲繞するリング
状導体６へそれぞれ印加される。電源部としての電池４
はペン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 electrical signal system diagram that also serves as a configuration diagram of a device using balanced signal transmission means. Directly connected to the main unit
A sine wave generator (or a square wave generator or the like) 3 of an active circuit is disposed inside the coordinate pointing pen 2 not having a cable (without a cable) to generate a continuous sine wave equal voltage. The balanced output of the sine wave-initiated <br/> production unit 3 are applied to the ring-shaped conductor 6 which surrounds stylus conductors 5 and this as two conductors of the tip portion of the coordinate pointing pen 2. Battery 4 as power supply
Supplies operating power to the interior of the pen.
【０００７】座標指示ペン２の先端部のスタイラス導体
５及びリング状導体６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。従って、座標指示ペ
ン２の先端部のスタイラス導体５とリング状導体６間の
電気信号はタブレット１の各電極線７，７，７，・・・
に結合容量の大きさに従ったレベルでそれぞれ伝わる。
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，・・・の隣り合う二電極をペアー
（組）としながら順次切り換えて、それぞれの二電極線
間平衡電圧信号を平衡不平衡変換器１０へ印加する。When the stylus conductor 5 and the ring-shaped conductor 6 at the tip of the coordinate pointing pen 2 are near the board surface of the tablet 1, each electrode wire 7 , 7 , 7 , 7 , ... It will be capacitively coupled. Accordingly, the electric signal between the stylus conductor 5 and the ring-shaped conductor 6 at the tip of the coordinate pointing pen 2 is transmitted to each of the electrode lines 7 , 7 , 7 , 7,.
At each level according to the magnitude of the coupling capacitance.
X and Y directions the analog multiplexer 8 and 9 each electrode line 7, 7, 7, pairs of adjacent Ri mutually second electrode of ...
The two pairs of electrodes are sequentially switched to apply the respective balanced voltage signals between the two electrode lines to the balanced-unbalanced converter 10.
【０００８】この平衡不平衡変換器１０の出力信号電圧
は取扱い易い対グランドレベルの不平衡信号に変換され
て、バンドパスフィルタ１１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の基本波成分のみ
通過させ、それ以外の周波数成分を阻止し、信号伝達経
路の途中で混入した外乱信号を減衰させる。バンドパス
フィルタ１１の出力信号は信号検出及び制御部１２へ印
加される。The output signal voltage of the balanced-unbalanced converter 10 is converted into an unbalanced signal of a ground level which is easy to handle and applied to the band-pass filter 11. The bandpass filter 11 allows only the fundamental wave component of the signal generator 3 such as a sine wave to pass therethrough, blocks other frequency components , and attenuates a disturbance signal mixed in the signal transmission path. The output signal of the bandpass filter 11 is applied to the signal detection and control unit 12.
【０００９】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号に記載したが、本質
的に外乱の影響を受けない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からタ
ブレット１まで平衡信号伝送を使用しているが故に、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、ほぼ零である信号レ
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
する平衡電圧と、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 features of this signal transmitting means are described in Japanese Patent Application No. 5-123601 filed by the applicant of the present invention. However, the signal transmitting means is essentially not affected by disturbance. X and
The Y-direction analog multiplexers 8 and 9 are connected to the first
The pole wire 7 and the second electrode wire 7 and then the second and third
The pole wire 7, then the third and fourth electrode wires 7, ...
Each pair is connected in turn as a pair.
Good. The X direction and the Y direction are connected in a time division manner. Now,
For example, the analog mask is applied to the fifth and sixth adjacent set electrode lines 7 in the X direction.
Fix the multiplexer 8 and style the tip of the coordinate pointing pen.
The position of the lath conductor 5 on the tablet 1 has been moved in the X direction.
The signal detection level in the signal detection and control unit 12
Characteristics (absolute voltage ignoring phase)
Because balanced signal transmission is used up to bullet 1, 5
Left and right symmetrically dipped at the middle position between
This is a characteristic with two peaks. Detection at the dip point
The signal phase shifts (inverts) by π (radian).
Interpolation method based on [signal level] that does not detect phase in application
Is the gist. By the way, conventionally, the signal level which is almost zero is
The detection signal of the bell, and at that point the phase changes greatly,
This was the interpolation used, which was the cause of the decrease in accuracy. Pen 2
From the signal detection and control unit 12 to the line
Adjacent (set) electrode wire 7 is received because it is a circuit with shape
Voltage and the signal in the signal detection and control unit 12
The detection level is proportional .
【００１０】次に信号検出及び制御部１２において行わ
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２
０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, a description will be given of the interpolation between the electrode lines based on the signal level, which is a feature of the present invention, performed in the signal detection and control section 12. 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). There, the above-mentioned
As described above, this is a characteristic having two symmetrical peaks that are dipped at the center point of the selected (fixed) two electrode lines. Characteristic curve 2
0 is a signal detection level characteristic by the nth and (n + 1) th electrode lines 7 where n is an arbitrary electrode line 7;
Is the characteristic by the (n + 1) th and (n + 2) th electrode lines 7, and the characteristic curve 22 is the characteristic by the (n + 2) th and (n + 3) th electrode lines 7. In the actual operation state, the tip position of the pen 2 is (almost) fixed.
It is determined and its coordinates will be obtained.
【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。[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 and the electrode line 7 is determined by an interpolation method.
【００１２】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。In the present application, attention has been paid to a triangle ABC (and a triangle ADE) indicated by oblique lines in FIG . S23 and S01
(The distance between points S23 and S01 in FIG. 3)
X) (approximate interpolation amount)
Ratio) and 1/2 of the distance (distance) between adjacent electrode wires
be equivalent to. Also, the distance between points C and B (the (n + 2) th
Of the detection signal according to the approximate characteristics 32 and 30 on the polar line 7
The level difference) is based on the dimensions of the tablet 1
There is a difference depending on the dielectric constant of the material, etc.
The average level of ABC (that is, (S23 + S01) / 2)
Many experiments have shown to be 0.8 times. this
To summarize these relationships, 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.
【００１３】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、更には区間分けし
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。It is to 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 take a weighted average, and furthermore, to divide the section and to obtain the average value of the conventional method. It goes without saying that there is a method of properly using the interpolation amount according to the method.
【００１４】[0014]
【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 a 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 座標指示ペン先端部のリング状導体 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 平衡不平衡変換器 １１ バンドパスフィルタ １２ 信号検出及び制御部 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1 tablet 2 coordinate indicator pen 3 sinusoidal signal generator of a rectangular wave, such as batteries 5 coordinate pointing pen point of the stylus conductor 6 coordinate pointing pen tip portion of the ring-shaped conductor 7 electrode line (s) 8 X-direction analog multiplexer 9 Y direction analog multiplexer 10 Balanced-unbalanced converter 11 Band-pass filter 12 Signal detection and control unit 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 n + 2 and n + 3 Signal detection level characteristic by the nth electrode line 30 Polygonal line approximation characteristic for n and n + 1th electrode lines 31 Polygonal line approximation characteristic for n + 1 and n + 2nd electrode lines 32 Polygonal line approximation characteristic for n + 2 and n + 3rd electrode lines
Claims (1)
の電極線を有するタブレットと、該タブレットの電極線
とそれぞれ静電容量結合する二つの導体を先端部に配設
した座標指示ペンと、前記電極線の隣り合う二本（隣接
電極線）からの信号を平衡入力し順次切り換え接続し二
線平衡信号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平衡信号を不平衡信号に変換
する平衡不平衡変換器と、該平衡不平衡変換器からの不
平衡信号を印加されるバンドパスフィルタと、該バンド
パスフィルタを介して信号を印加される信号検出及び制
御部とを有し、前記座標指示ペン内部に電源部と、前記
二つの導体へ平衡接続された正弦波、矩形波等の、基本
波周波数が前記バンドパスフィルタのパス周波数である
交番信号発生器とが配置され、前記電極線の各隣接電極
線毎の平衡信号電圧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＋Ｓ0
1）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事により、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。A tablet having a plurality of electrode lines arranged along X and Y coordinate axes, and a coordinate pointing pen having two conductors, each of which is capacitively coupled to the electrode line of the tablet, disposed at a tip end thereof. When, two mutually Ri next to the electrode lines (adjacent
An analog multiplexer that balances the signals from the electrode lines and sequentially switches and connects them to output a two-wire balanced signal; a balanced-unbalanced converter that converts the balanced signal from the analog multiplexer into an unbalanced signal; a band-pass filter which is applied to the unbalanced signal from the vessel, and a signal detection and control unit is applied to the signal through the band-pass filter, and the coordinate pointing pen inside the power supply unit, the <br /> Basic, such as sine wave and square wave balanced connection to two conductors
Arranged and <br/> alternating signal generator wave frequency is the path frequency of the band-pass filter, a balanced signal voltage level for each adjacent electrode line of the electrode line in the signal detection and control unit <br / > by measuring the coordinates fingers to the tablet
In the coordinate detecting device for outputting the contact position coordinates of the indicating pen, the contact position coordinates in the X and Y directions are set to the corresponding contact positions.
How to calculate and interpolate in detail between the two electrode lines closest to each other
In interpolating the contact coordinates from the measured values , in the case of the X direction (the same applies to the Y direction), X = (d / 2) × 2.5 (S23−S01) / ( S23 + S0
Intermediate between the two electrode wires closest to the contact position obtained by 1)
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 the use of a means for 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18185593A JP3240760B2 (en) | 1993-06-28 | 1993-06-28 | Interpolation method in coordinate detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18185593A JP3240760B2 (en) | 1993-06-28 | 1993-06-28 | Interpolation method in coordinate detection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0713680A JPH0713680A (en) | 1995-01-17 |
| JP3240760B2 true JP3240760B2 (en) | 2001-12-25 |
Family
ID=16108016
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18185593A Expired - Lifetime JP3240760B2 (en) | 1993-06-28 | 1993-06-28 | Interpolation method in coordinate detection device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3240760B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5467005B2 (en) | 2010-06-28 | 2014-04-09 | 京セラ株式会社 | Touch position detecting device and mobile phone |
-
1993
- 1993-06-28 JP JP18185593A patent/JP3240760B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0713680A (en) | 1995-01-17 |
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