JP3158780B2 - Coordinate detection device - Google Patents
Coordinate detection deviceInfo
- Publication number
- JP3158780B2 JP3158780B2 JP12360193A JP12360193A JP3158780B2 JP 3158780 B2 JP3158780 B2 JP 3158780B2 JP 12360193 A JP12360193 A JP 12360193A JP 12360193 A JP12360193 A JP 12360193A JP 3158780 B2 JP3158780 B2 JP 3158780B2
- Authority
- JP
- Japan
- Prior art keywords
- balanced
- signal
- detection
- pen
- tip
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
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
れたケーブル無しの検出ペンの、タブレットへの当接位
置情報をディジタル値で出力する座標検出装置に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coordinate detecting device for outputting, as a digital value, contact position information of a detection pen without a cable, which is in contact with a tablet, with the tablet.
【０００２】[0002]
【従来の技術】 従来の装置本体とのケーブル無しの静
電容量結合方式検出ペンを使用したタブレット座標検出
装置においては疑似グランド（疑似接地）を信号のリタ
ーン経路とする不平衡信号伝送方式であった。2. Description of the Related Art In a conventional tablet coordinate detecting apparatus using a capacitive coupling type detecting pen without a cable connected to an apparatus main body, an unbalanced signal transmission method using a pseudo ground (pseudo ground) as a signal return path is used. Was.
【０００３】[0003]
【発明が解決しようとする課題】 上述した従来の不平
衡信号によるものは操作する人体により、また検出ペン
の傾き角等により信号リターン経路の安定性に大きなバ
ラツキがあり位置検出精度に少なからぬ影響を及ぼして
いた。The above-mentioned conventional unbalanced signal has a large variation in the stability of the signal return path due to the operating human body and the inclination angle of the detection pen, and has a considerable influence on the position detection accuracy. Was exerted.
【０００４】[0004]
【課題を解決するための手段】 本発明は上述した従来
の問題点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
体を先端部に配置した検出ペンと、前記電極線の隣り合
う二本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、平衡不平
衡変換器、バンドパスフィルタ、信号検出及び制御部と
を有し、前記検出ペン内部に電源部と検出ペン先端部の
二つの導体へ平衡接続された正弦波発生器とを有し、各
ペアー電極線毎の平衡信号電圧レベルを計測することに
よってダブレットへの検出ペンの当接位置座標を出力す
る座標検出装置を提案するものである。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has a tablet having a plurality of electrode lines arranged along X and Y coordinate axes; A detection pen having two conductors, each of which is capacitively coupled at the tip, a balanced input of signals from two adjacent electrode wires, an analog multiplexer for sequentially switching and connecting and outputting a two-wire balanced signal; An unbalanced converter, a bandpass filter, a signal detection and control unit, a power supply unit inside the detection pen and a sine wave generator balancedly connected to two conductors at the tip of the detection pen, The present invention proposes a coordinate detection device that outputs a coordinate of a contact position of a detection pen to a doublet by measuring a balanced signal voltage level for each pair of electrode lines.
【０００５】[0005]
【作用】 本発明の平衡電圧信号はいつも隣合う二線間
に一つの信号を通すため、他の点（例えばグランド）に
対する電位には無関係である事から、グランドに対する
どのような電位変動（例えばグランドから見ればノイ
ズ）にも全く無関係に平衡電圧信号を伝達する。Since the balanced voltage signal of the present invention always passes one signal between two adjacent wires, it is independent of the potential with respect to other points (eg, ground). A balanced voltage signal is transmitted irrespective of noise (as viewed from the ground).
【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、本発明の実施例の装置全体構成図であ
る。検出ペン５内部にアクティブ回路の正弦波発生器１
が配置され連続した正弦波電圧を発生する。この正弦波
発生器１の平衡出力は検出ペン先端部のスタイラス導体
３及びリング状導体４へそれぞれ印加される。電源部と
しての電池２はペン内部へ動作電力を供給する。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 overall configuration diagram of an apparatus according to an embodiment of the present invention. An active circuit sine wave generator 1 inside the detection pen 5
Are arranged to generate a continuous sinusoidal voltage. The balanced output of the sine wave generator 1 is applied to the stylus conductor 3 and the ring-shaped conductor 4 at the tip of the detection pen. The battery 2 as a power supply supplies operation power to the inside of the pen.
【０００７】検出ペン５の先端部のスタイラス導体３及
びリング状導体４はタブレット６の盤面近くにある時、
タブレット６の各電極線７と小容量の静電容量結合する
ことになる。従って、検出ペン５の先端部のスタイラス
導体３とリング状導体４間の電気信号はタブレット６の
各電極線７に結合容量の大きさに従ったレベルでそれぞ
れ伝わることになる。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の隣り合う二電極線をペ
アー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。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は必
要信号のみ通過させ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。When the stylus conductor 3 and the ring-shaped conductor 4 at the tip of the detection pen 5 are near the surface of the tablet 6,
Each of the electrode wires 7 of the tablet 6 is coupled with a small capacitance. Accordingly, an electric signal between the stylus conductor 3 and the ring-shaped conductor 4 at the tip of the detection pen 5 is transmitted to each electrode wire 7 of the tablet 6 at a level according to the magnitude of the coupling capacitance. The X-direction and Y-direction analog multiplexers 8 and 9 sequentially switch two electrode lines adjacent to each other while pairing them, and apply a balanced voltage signal between the two electrode lines to the balanced-unbalanced converter 10. The output signal voltage of the balanced-unbalanced converter 10 is converted into an unbalanced signal with respect to the ground level which is easy to handle, and applied to the band-pass filter 11. The band-pass filter 11 passes only necessary signals and attenuates disturbance signals mixed in the signal transmission path. The output signal of the bandpass filter 11 is applied to the signal detection and control unit 12.
【０００８】次に検出ペン５のタブレット６上の位置に
よる信号レベルとその座標判定について説明すると、タ
ブレット６の各電極線７の任意の隣り合う二電極線間信
号を平衡電気信号として扱うため、検出ペン５の先端部
スタイラス導体３のタブレット６上のＸ軸上位置（Ｙ軸
上位置に対しても同様）に対する、位相を無視した絶対
値による信号検出レベルは図２に示すが、中心がディッ
プした左右対称の特性になる。特性曲線２１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２２はｎ＋１とｎ
＋２番目の特性であり、特性曲線２３はｎ＋２とｎ＋３
番目の特性である。信号検出及び制御部１２はこれらの
信号検出レベルから上位２ないし３のものより判断し、
表または計算により線間補間を行い、精密な座標位置を
判定してディジタル出力する。Next, the signal level based on the position of the detection pen 5 on the tablet 6 and the determination of its coordinates will be described. In order to treat a signal between any two adjacent electrode lines of each electrode line 7 of the tablet 6 as a balanced electric signal, FIG. 2 shows the signal detection level based on the absolute value ignoring the phase with respect to the position on the X axis of the stylus conductor 3 of the tip portion of the detection pen 5 on the tablet 6 (the same applies to the position on the Y axis). It becomes a left-right symmetric characteristic. A characteristic curve 21 is a signal detection level characteristic by the nth and n + 1th electrode lines 7 where n is an arbitrary electrode line 7, and a characteristic curve 22 is n + 1 and n
The characteristic curve 23 is n + 2 and n + 3.
The second characteristic. The signal detection and control unit 12 judges from these signal detection levels from the upper two or three,
Interpolation between lines is performed by a table or calculation to determine a precise coordinate position and digitally output.
【０００９】本発明による座標検出装置は、静電容量結
合方式検出ペンを使用した従来技術によるタブレット座
標検出装置が利用していた疑似グランドによる信号リタ
ーン経路を必要としない信号伝達手段を利用しており、
さらに説明を加えれば対グランド電圧レベルに全く依存
しない信号伝達手段であり、グランドに対して変動する
外乱信号の影響を本質的に受けない。The coordinate detecting device according to the present invention utilizes signal transmission means which does not require a signal return path by a pseudo ground, which is used by a conventional tablet coordinate detecting device using a capacitive coupling type detecting pen. Yes,
More specifically, the signal transmission means does not depend at all on the ground voltage level, and is essentially not affected by disturbance signals which fluctuate with respect to the ground.
【００１０】他の実施例として信号検出ペン５に矩形波
発生器を内蔵したものについて説明する。矩形波発生器
の信号が連続波であることからその基本波成分の振幅は
矩形波の振幅の（４／π）倍であり、バンドパスフィル
タ１１がその基本波成分のみ通過させる事により、正弦
波発生器を使用したものに比し１．２７倍以上の信号検
出レベルを得る事ができて、効率よい動作となる。また
更にアナログマルチプレクサ８及び９の接続構成を少し
変え、その平衡出力の一方を偶数番目の電極線のみに切
り換え接続させ、他方を奇数番目の電極線のみに切り換
え接続させて、アナログマルチプレクサ８及び９の規模
を小さくして検出ペンの当接位置の座標検出もできる事
は言うまでもない。As another embodiment, a signal detection pen 5 having a built-in rectangular wave generator will be described. Since the signal of the rectangular wave generator is a continuous wave, the amplitude of the fundamental wave component is (4 / π) times the amplitude of the rectangular wave. A signal detection level 1.27 times or more as high as that using a wave generator can be obtained, resulting in efficient operation. Further, the connection configuration of the analog multiplexers 8 and 9 is slightly changed so that one of the balanced outputs is switched and connected only to the even-numbered electrode lines, and the other is switched and connected only to the odd-numbered electrode lines. It is needless to say that the coordinates of the contact position of the detection pen can be detected by reducing the size of.
【００１１】尚、検出ペンの先端の導体をスタイラス導
体と、このスタイラス導体を囲繞するリング状導体で説
明したが、本発明はこれに限定されるものではなく、二
本の検出導体を使用するものでも実現できるものであ
る。The conductor at the tip of the detection pen has been described as a stylus conductor and a ring-shaped conductor surrounding the stylus conductor. However, the present invention is not limited to this, and two detection conductors are used. It can also be realized by something.
【００１２】[0012]
【発明の効果】 以上説明したように本発明では不安定
要素の多い疑似グランドによる信号リターン経路を利用
する事がなく、平衡信号伝達手段を使用しているため、
人体の影響及びその他の外乱を基本的には受け付けない
事による精度のよい且つ安定動作する座標検出装置とす
る事ができた。As described above, the present invention does not use a signal return path by a pseudo ground having a lot of unstable elements, and uses a balanced signal transmitting means.
An accurate and stable operation of the coordinate detecting device by basically rejecting the influence of the human body and other disturbances was achieved.
【図１】 装置全体構成図FIG. 1 is an overall configuration diagram of the apparatus.
【図２】 信号検出レベル特性図FIG. 2 is a signal detection level characteristic diagram
１ 正弦波発生器 ２ 電池 ３ 検出ペン先端部のスタイラス導体 ４ 検出ペン先端部のリング状導体 ５ 検出ペン ６ タブレット ７ 電極線 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 ２１ ｎとｎ＋１番目の電極線による信号検出レベル
特性 ２２ ｎ＋１とｎ＋２番目の電極線による信号検出レ
ベル特性 ２３ ｎ＋２とｎ＋３番目の電極線による信号検出レ
ベル特性DESCRIPTION OF SYMBOLS 1 Sine wave generator 2 Battery 3 Stylus conductor at the tip of a detection pen 4 Ring-shaped conductor at the tip of a detection pen 5 Detection pen 6 Tablet 7 Electrode wire 8 X-direction analog multiplexer 9 Y-direction analog multiplexer 10 Balance-unbalance converter 11 Band Pass filter 12 Signal detection and control unit 21 Signal detection level characteristics by n and n + 1th electrode lines 22 Signal detection level characteristics by n + 1 and n + 2nd electrode lines 23 Signal detection level characteristics by n + 2 and n + 3rd electrode lines
Claims (3)
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置
した検出ペンと、前記電極線の隣り合う二本からの信号
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、平衡不平衡変換器、バンド
パスフィルタ、信号検出及び制御部とを有し、前記検出
ペン内部に電源部と検出ペン先端部の二つの導体へ平衡
接続された正弦波発生器とを有し、各ペアー電極線毎の
平衡信号電圧レベルを計測することによってダブレット
への検出ペンの当接位置座標を出力することを特徴とす
る座標検出装置。1. A tablet having a plurality of electrode lines arranged along X and Y coordinate axes, a detection pen having two conductors, each of which is capacitively coupled to the electrode line of the tablet, arranged at a tip thereof. An analog multiplexer for balanced input of signals from adjacent two of the electrode wires and sequentially switching and connecting and outputting a two-wire balanced signal, a balanced-unbalanced converter, a band-pass filter, a signal detection and control unit, The detection pen has a power supply unit and a sine wave generator balanced to two conductors at the tip of the detection pen, and measures the equilibrium signal voltage level for each pair of electrode wires to detect the pen to the doublet. A coordinate detecting device for outputting contact position coordinates.
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置
した検出ペンと、前記電極線の隣り合う二本からの信号
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、平衡不平衡変換器、信号検
出及び制御部とを有し、前記検出ペン内部に電源部と検
出ペン先端部の二つの導体へ平衡接続された矩形波発生
器とを有し、各ペアー電極線毎の平衡信号電圧レベルを
計測することによってダブレットへの検出ペンの当接位
置座標を出力することを特徴とする座標検出装置。2. A tablet having a plurality of electrode lines arranged along X and Y coordinate axes, a detection pen having two conductors respectively capacitively coupled to the electrode lines of the tablet at a tip thereof, An analog multiplexer for balanced input of signals from adjacent two of the electrode wires and successively switching and connecting and outputting a two-wire balanced signal, a balanced-unbalanced converter, a signal detection and control unit, and inside the detection pen It has a power supply unit and a rectangular wave generator balanced to two conductors at the tip of the detection pen, and measures the equilibrium signal voltage level for each pair of electrode wires to determine the contact position of the detection pen with the doublet. A coordinate detecting device for outputting a coordinate.
ス導体と、該スタイラス導体を囲繞するリング状導体と
したことを特徴とする請求項１及び２の座標検出装置。3. The coordinate detecting device according to claim 1, wherein the two conductors at the tip of the detecting pen are a stylus conductor and a ring-shaped conductor surrounding the stylus conductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12360193A JP3158780B2 (en) | 1993-04-27 | 1993-04-27 | Coordinate detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12360193A JP3158780B2 (en) | 1993-04-27 | 1993-04-27 | Coordinate detection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06314155A JPH06314155A (en) | 1994-11-08 |
| JP3158780B2 true JP3158780B2 (en) | 2001-04-23 |
Family
ID=14864653
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12360193A Expired - Lifetime JP3158780B2 (en) | 1993-04-27 | 1993-04-27 | Coordinate detection device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3158780B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8212795B2 (en) | 2008-05-21 | 2012-07-03 | Hypercom Corporation | Payment terminal stylus with touch screen contact detection |
| US9104251B1 (en) | 2011-07-27 | 2015-08-11 | Cypress Semiconductor Corporation | Full-bridge tip driver for active stylus |
-
1993
- 1993-04-27 JP JP12360193A patent/JP3158780B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06314155A (en) | 1994-11-08 |
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