JPH1173270A - Electrostatic capacity coupling type coordinate input device using indirectly coupled pen case - Google Patents
Electrostatic capacity coupling type coordinate input device using indirectly coupled pen caseInfo
- Publication number
- JPH1173270A JPH1173270A JP24767897A JP24767897A JPH1173270A JP H1173270 A JPH1173270 A JP H1173270A JP 24767897 A JP24767897 A JP 24767897A JP 24767897 A JP24767897 A JP 24767897A JP H1173270 A JPH1173270 A JP H1173270A
- Authority
- JP
- Japan
- Prior art keywords
- conductor
- pen
- capacitor
- coordinate
- input device
- 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.)
- Granted
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、静電容量結合型座
標入力装置に関し、特に座標指示ペンにおいて、シ−ル
ドケ−ス導体を回路グランドに直結しない構造のものに
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a capacitive coupling type coordinate input device, and more particularly to a coordinate pointing pen having a structure in which a shield case conductor is not directly connected to a circuit ground.
【０００２】[0002]
【従来技術】従来、静電容量結合型座標入力装置に設け
られている座標指示ペンは、シ−ルド効果を良くする為
に、回路グランドに上記シ−ルドケ−ス導体を直接、接
続した構造を採用していた。2. Description of the Related Art Conventionally, a coordinate pointing pen provided in a capacitive coupling type coordinate input device has a structure in which the shield case conductor is directly connected to a circuit ground in order to improve a shield effect. Was adopted.
【０００３】[0003]
【発明が解決しようとする課題】しかし上述した従来の
技術では、実際の静電容量結合型座標入力装置は電源部
に於いてＡＣ電源から装置の回路グランドへの漏れＡＣ
成分が、多かれ少なかれ存在する為に、操作者が座標指
示ペンを手に持った時に、ピリピリする電気感を敏感な
人は感じていた。また上記したような電気感を感じない
ようにする為に、座標指示ペンを塗装して対処していた
が、このような対処を行っても確実な絶縁は困難であ
り、ピリピリする電気感はかなり、軽度にはなるが充分
とはいえなかった。However, in the above-mentioned prior art, the actual capacitively coupled coordinate input device has a leakage AC from the AC power supply to the circuit ground of the device in the power supply section.
Sensitive people felt a tingling electric sensation when the operator held the coordinate indicating pen in his hand, due to the presence of more or less components. Also, in order to avoid the above-mentioned electric sensation, a coordinate pointing pen was painted to deal with it, but even if such a measure was taken, reliable insulation was difficult, and the tingling electric sensation It was fairly mild but not enough.
【０００４】[0004]
【課題を解決するための手段】本発明は、如上の課題に
鑑みなされたもので、タブレットから発信する電気信号
を静電容量結合を介し、検出する座標指示ペンを使用し
た座標入力装置であって、前記座標指示ペンのシ−ルド
ケ−ス導体が０．０５μＦ以下のコンデンサ及び５０ｋ
Ω以上の抵抗を介し回路グランドに接続される静電容量
結合型座標入力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 problems, and is directed to a coordinate input device using a coordinate pointing pen for detecting an electric signal transmitted from a tablet via a capacitive coupling. The shield case conductor of the coordinate pointing pen has a capacitor of 0.05 .mu.F or less and 50 kF.
An electrostatic capacitance coupling type coordinate input device connected to a circuit ground via a resistor of Ω or more is proposed.
【０００５】[0005]
【作用】ＡＣ電源の周波数は５０〜６０Ｈｚであり、座
標用電気信号の周波数成分は通常１００ｋＨｚ以上と高
く、０．０５μＦ以下のコンデンサのリアクタンスは上
記の各周波数に対して大きく異なり、ＡＣ電源周波数に
対しては不良導体となり座標用電気信号に対しては良導
体となる。The frequency of the AC power supply is 50 to 60 Hz, the frequency component of the electric signal for coordinates is usually as high as 100 kHz or more, and the reactance of the capacitor of 0.05 μF or less is largely different from each of the above frequencies. Is a bad conductor for the electric signal for coordinates.
【０００６】[0006]
【発明の実施の形態】本発明は、座標指示ペンのシール
ドケース導体と回路グランド間を上記作用のコンデンサ
及び静電気帯電防止用の高抵抗値の抵抗を介して接続
し、ＡＣ電源からの漏れ電気に対しては座標指示ペンの
シールドケース導体が実際上のフローティングとなり操
作者に不快な電気感を与えず、座標用電気信号に対して
はシールドとなる座標指示ペンである。DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the present invention, a shield case conductor of a coordinate pointing pen and a circuit ground are connected via a capacitor having the above-described function and a high-resistance resistor for preventing electrostatic charging, and the leakage electric power from an AC power supply is connected. , The shield case conductor of the coordinate pointing pen actually floats and does not give an unpleasant electric sensation to the operator.
【０００７】[0007]
【実施例】以下、本発明の詳細を添付図面を参照して説
明する。図１は本装置の要部構成図である。座標入力を
行うに当たり、座標指示ペン１（以下ペン１と略記す
る）の先端部のスタイラス導体３がタブレット（座標
盤）２上にある時、タブレット２上に於けるペン１の先
端の座標を読み取る。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 a configuration diagram of a main part of the present apparatus. When inputting coordinates, when the stylus conductor 3 at the tip of the coordinate indicating pen 1 (hereinafter abbreviated as pen 1) is on the tablet (coordinate board) 2, the coordinates of the tip of the pen 1 on the tablet 2 read.
【０００８】制御部１３の出力するタブレットドライブ
信号１４により、タブレット２の内部導体が電気駆動さ
れる。タブレット２の表面は樹脂またはガラス等で覆わ
れて絶縁されている。タブレット２の内部導体の構造
は、格子状、縦または横方向のみの平行抵抗膜、または
全面ベタ状抵抗膜等の様々な種類のものが採用されてい
るが、本発明の本質からかけ離れているので、その説明
は省略する。The internal conductor of the tablet 2 is electrically driven by the tablet drive signal 14 output from the control unit 13. The surface of the tablet 2 is insulated by being covered with resin or glass. As the structure of the inner conductor of the tablet 2, various kinds of structures such as a lattice, a parallel resistance film only in the vertical or horizontal direction, or a solid resistance film on the entire surface are adopted, which are far from the essence of the present invention. Therefore, the description is omitted.
【０００９】ペン１の先端のスタイラス導体３が、タブ
レット２上にあるかまたは近接している時、タブレット
２の内部導体とスタイラス導体３の間に実際には静電容
量（結合容量）４が小量ではあるが存在する。この結合
容量４を介して、タブレット２の内部導体の駆動される
電気信号がスタイラス導体３に伝わる。結合容量４は通
常1ｐＦ程度と小さく、結局スタイラス導体３へ伝わる
電気信号も微弱なため、ペン１の内部回路をシールドす
る事は必須条件である。When the stylus conductor 3 at the tip of the pen 1 is on or close to the tablet 2, a capacitance (coupling capacitance) 4 is actually formed between the inner conductor of the tablet 2 and the stylus conductor 3. Present in small quantities. An electric signal for driving the inner conductor of the tablet 2 is transmitted to the stylus conductor 3 via the coupling capacitor 4. Since the coupling capacitance 4 is usually as small as about 1 pF and the electric signal transmitted to the stylus conductor 3 is also weak, it is an essential condition to shield the internal circuit of the pen 1.
【００１０】スタイラス導体３が検出した電気信号はペ
ン１内の回路により増幅され、また簡単なバンドパス等
の処理が行われ、シールドケーブル１２を介して制御部
１３へ伝わる。制御部１３は電気信号の振幅、位相等か
ら座標計算を行いタブレット２上のペン１の先端位置を
座標情報出力として外部へデジタル出力する。The electric signal detected by the stylus conductor 3 is amplified by a circuit in the pen 1, subjected to simple band-pass processing and the like, and transmitted to the control unit 13 via the shielded cable 12. The control unit 13 calculates coordinates from the amplitude, phase, and the like of the electric signal, and digitally outputs the tip position of the pen 1 on the tablet 2 to the outside as coordinate information output.
【００１１】ここでＡＣ電源１６からの漏れＡＣ成分
（漏れ電気）１７について説明する。電源回路１５は通
常は絶縁型であるが、電源ノイズフィルタを介し、また
は入出力間の電磁誘導及び浮遊容量を介して、実際には
ＡＣ電源１６から漏れＡＣ成分１７が多かれ少なかれ回
路グランドへ伝わり、結局シールドケーブル１２へも伝
わる。Here, the leakage AC component (leakage electricity) 17 from the AC power supply 16 will be described. The power supply circuit 15 is usually of an insulated type, but actually, the leakage AC component 17 is transmitted to the circuit ground more or less from the AC power supply 16 through a power supply noise filter or through electromagnetic induction and stray capacitance between input and output. After all, it is transmitted to the shielded cable 12.
【００１２】本発明では、ＡＣ電源１６の周波数と座標
用電気信号（タブレットドライブ信号１４）の周波数成
分の違いに着目した。すなわちＡＣ電源１６の周波数は
５０または６０Hzであり、座標用電気信号はパルスでも
正弦波状でも、通常100ｋＨｚ以上の周波数成分であ
る。コンデンサのリアクタンスは周波数に反比例するの
で、参照符号１０に示すようにシールドケース導体１１
と回路グランドを接続するのに都合が良い。In the present invention, attention has been paid to the difference between the frequency of the AC power supply 16 and the frequency component of the coordinate electric signal (tablet drive signal 14). In other words, the frequency of the AC power supply 16 is 50 or 60 Hz, and the electric signal for coordinates, whether pulsed or sinusoidal, usually has a frequency component of 100 kHz or more. Since the reactance of the capacitor is inversely proportional to the frequency, the shield case conductor 11
It is convenient to connect to the circuit ground.
【００１３】多くの実験の結果、ＡＣ電源が５Ｖｒｍｓ
の場合５０ｋΩ以上のインピーダンスで、またＡＣ電源
が１００Ｖｒｍｓの場合1ＭΩ以上のインピーダンス
で、シールドケース導体１１と回路グランドを接続し、
漏れＡＣ成分１７を強制的に付加しても、すべての操作
者が湿度８５％の時に塗装しないシールドケース導体１
１を手に持ってもピリピリする電気感を全く感じること
はなかった。コンデンサの値で言えば、５ＶｒｍｓのＡ
Ｃ電源１６に対しては約０．０５μＦであり、１００Ｖ
ｒｍｓのＡＣ電源１６に対しては約２０００ｐＦとな
る。As a result of many experiments, it was found that the AC power supply was 5 Vrms.
The shield case conductor 11 and the circuit ground are connected with an impedance of 50 kΩ or more in the case of, and with an impedance of 1 MΩ or more when the AC power supply is 100 Vrms,
Even if the leaked AC component 17 is forcibly added, the shield case conductor 1 is not painted by all operators when the humidity is 85%.
I didn't feel any tingling electric sensation even if I had 1 in my hand. In terms of capacitor value, A of 5 Vrms
About 0.05 μF for C power supply 16 and 100 V
For an AC power supply 16 at rms, this is about 2000 pF.
【００１４】ちなみに座標用電気信号の周波数が４５５
ｋＨｚのときに、２０００ｐＦのリアクタンスは約１７
０Ωであり、シールドケース導体１１をその本来の目的
の座標用電気信号に対するシールド作用をさせるには、
ほぼ充分に低い値である。図１に示す高抵抗９は、シー
ルドケース導体１１の静電気に対する帯電防止が目的で
あり、ケースシールドコンデンサ１０との合成インピー
ダンスが段落１３に示す値より低くならなければよい。The frequency of the electric signal for coordinates is 455.
At kHz, the reactance of 2000 pF is about 17
0Ω, and in order to make the shield case conductor 11 shield the original target electric signal for coordinates,
It is almost sufficiently low. The purpose of the high resistance 9 shown in FIG. 1 is to prevent the shield case conductor 11 from being charged against static electricity, and the combined impedance with the case shield capacitor 10 only needs to be lower than the value shown in paragraph 13.
【００１５】次に、上記の手段ではシールドケース導体
１１から混入する微少ノイズによる少しの検出座標精度
の悪化を、許容できない程の高精度を要する場合の座標
検出について説明する。ペン１の構造上、実際には５〜
１０ｐＦの浮遊容量５が存在する。また、操作者が左手
をタブレット２の上に置き右手でペン1を持つと、左手
の位置座標用電気信号（疑信号）が人体を通じてシール
ドケース導体１１へ伝わる。更に外来ノイズも主に人体
がアンテナとなってシールドケース導体１１へ伝わる。Next, a description will be given of coordinate detection in the case where a small deterioration in detection coordinate accuracy due to minute noise mixed in from the shield case conductor 11 requires unacceptably high accuracy. Due to the structure of the pen 1, actually
There is a stray capacitance 5 of 10 pF. When the operator places the left hand on the tablet 2 and holds the pen 1 with the right hand, the position coordinate electric signal (suspect signal) of the left hand is transmitted to the shield case conductor 11 through the human body. Further, external noise is transmitted to the shield case conductor 11 mainly with the human body serving as an antenna.
【００１６】本装置はシールドケース導体１１が回路グ
ランドへ直結していない（しかし座標用電気信号に対し
ては低インピーダンスの接続である）。このために、上
記不要疑信号成分またはノイズにより微少の電圧変動が
シールドケース導体１１に生じる。この電圧変動が浮遊
容量５を介してスタイラス導体３へ少しではあるが伝わ
り、本来の座標用電気信号のＳ／Ｎ比を少し悪化させ
る。In the present device, the shield case conductor 11 is not directly connected to the circuit ground (however, it has a low impedance connection for the electric signal for coordinates). For this reason, a minute voltage fluctuation occurs in the shield case conductor 11 due to the unnecessary suspect signal component or noise. This voltage fluctuation is transmitted to the stylus conductor 3 through the stray capacitance 5 to a small extent, thereby slightly deteriorating the S / N ratio of the original electric signal for coordinates.
【００１７】上記した、Ｓ／Ｎ比の悪化を防止する手段
について説明する。参照符号６の回路を信号極性反転
（増幅）アナログ回路とする。抵抗７及びコンデンサ８
を介して、シールドケース導体１１の電圧変動の内から
適量を、信号極性反転アナログ回路６の出力部へ印加
し、浮遊容量５を介してスタイラス導体３へ伝わり極性
反転された成分を中和（相殺）キャンセルする。抵抗７
及びコンデンサ８の直列回路による中和回路とした理由
は、位相及び振幅の両方で完全に中和するためである。
従ってシールドケース導体１１から浮遊容量５を介して
伝わった成分は、同じシールドケース導体１１から抵抗
７及びコンデンサ８を介して伝わった成分により、完全
に中和キャンセルされ、タブレット２から結合容量４を
介して伝わった本来の信号成分は、少しの悪影響も受け
ない。従ってペン１の出力する信号のＳ／Ｎ比は大変良
いものであり、シールドケース導体１１を回路グランド
に直結したものと同等の高精度で座標検出が可能であ
る。The means for preventing the deterioration of the S / N ratio will be described. The circuit denoted by reference numeral 6 is a signal polarity inversion (amplification) analog circuit. Resistor 7 and capacitor 8
, An appropriate amount of the voltage fluctuation of the shield case conductor 11 is applied to the output portion of the signal polarity reversal analog circuit 6 to neutralize the component whose polarity has been reversed transmitted to the stylus conductor 3 via the stray capacitance 5 ( Cancel) cancel. Resistance 7
The reason why the neutralization circuit is a series circuit of the capacitor 8 is to completely neutralize both the phase and the amplitude.
Therefore, the component transmitted from the shield case conductor 11 via the stray capacitance 5 is completely neutralized and canceled by the component transmitted from the same shield case conductor 11 via the resistor 7 and the capacitor 8, and the coupling capacitance 4 is removed from the tablet 2. The original signal component transmitted through is not adversely affected. Therefore, the S / N ratio of the signal output from the pen 1 is very good, and the coordinates can be detected with the same high precision as that obtained by directly connecting the shield case conductor 11 to the circuit ground.
【００１８】[0018]
【発明の効果】本発明は、以上のような構成となってい
るので、ＡＣ電源１６の周波数に対しては、実際上フロ
−ティングのペンケ−スとなり、操作者がペン１を使用
したときに、ピリピリする電気感を感じることなく、且
つ座標検出精度は必要充分なものが得られた。Since the present invention has the above-described configuration, the frequency of the AC power supply 16 is actually a floating pen case. In addition, a necessary and sufficient coordinate detection accuracy was obtained without feeling a tingling electric sensation.
【図１】 本装置の要部構成図FIG. 1 is a configuration diagram of a main part of the present apparatus.
１ 座標指示ペン ２ タブレット（座標盤） ３ スタイラス導体 ４ 結合容量 ５ 浮遊容量 ６ 信号極性反転アナログ回路 ７ ケ−スノイズ中和用抵抗 ８ ケ−スノイズ中和用コンデンサ ９ 高抵抗 １０ 座標用電気信号に対するケ−スシ−ルドコンデン
サ １１ シ−ルドケ−ス導体 １２ シ−ルドケ−ブル １３ 制御部 １４ タブレットドライブ信号 １５ 電源回路 １６ ＡＣ電源 １７ 漏れＡＣ成分DESCRIPTION OF SYMBOLS 1 Coordinate pointing pen 2 Tablet (coordinate board) 3 Stylus conductor 4 Coupling capacitance 5 Floating capacitance 6 Signal polarity reversal analog circuit 7 Case noise neutralizing resistor 8 Case noise neutralizing capacitor 9 High resistance 10 For electric signal for coordinates Case shield capacitor 11 Shield case conductor 12 Shield cable 13 Control unit 14 Tablet drive signal 15 Power supply circuit 16 AC power supply 17 Leakage AC component
Claims (2)
容量結合を介し、検出する座標指示ペンを使用した座標
入力装置であって、前記座標指示ペンのシ−ルドケ−ス
導体が０．０５μＦ以下のコンデンサ及び５０ｋΩ以上
の抵抗を介し回路グランドに接続されることを特徴とす
る非直結ペンケ−スを使用した静電容量結合型座標入力
装置。1. A coordinate input device using a coordinate pointing pen for detecting an electric signal transmitted from a tablet through capacitive coupling, wherein a shield case conductor of the coordinate pointing pen has a size of 0.05 μF or less. A capacitive input type coordinate input device using a non-directly connected pen case, which is connected to a circuit ground through a capacitor and a resistor of 50 kΩ or more.
グ回路を有し、前記シ−ルドケ−ス導体から浮遊容量を
介し混入する微少ノイズまたは不要微少信号成分を、ケ
−スノイズ中和用コンデンサ及びケ−スノイズ中和用抵
抗の直列回路により、前記信号極性反転アナログ回路の
出力部で、中和キャンセルすることを特徴とする請求項
１記載の非直結ペンケ−スを使用した静電容量結合型座
標入力装置。A signal polarity inverting analog circuit inside the coordinate pointing pen, and a case noise neutralizing capacitor for minimizing minute noise or unnecessary minute signal components mixed in from the shield case conductor via a stray capacitance; 2. A capacitance coupling type using a non-directly connected pen case according to claim 1, wherein neutralization is canceled at an output portion of said signal polarity inverting analog circuit by a series circuit of case noise neutralizing resistors. Coordinate input device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24767897A JP3864512B2 (en) | 1997-08-28 | 1997-08-28 | Capacitive coupling type coordinate input device using non-directly connected pen case |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24767897A JP3864512B2 (en) | 1997-08-28 | 1997-08-28 | Capacitive coupling type coordinate input device using non-directly connected pen case |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1173270A true JPH1173270A (en) | 1999-03-16 |
| JP3864512B2 JP3864512B2 (en) | 2007-01-10 |
Family
ID=17167032
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24767897A Expired - Lifetime JP3864512B2 (en) | 1997-08-28 | 1997-08-28 | Capacitive coupling type coordinate input device using non-directly connected pen case |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3864512B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002151706A (en) * | 2000-11-14 | 2002-05-24 | Sharp Corp | Electric apparatus comprising light-receiving unit |
| JPWO2013047227A1 (en) * | 2011-09-27 | 2015-03-26 | シャープ株式会社 | Electronics |
| US9201556B2 (en) | 2006-11-08 | 2015-12-01 | 3M Innovative Properties Company | Touch location sensing system and method employing sensor data fitting to a predefined curve |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5429636B2 (en) | 2009-04-10 | 2014-02-26 | Ｎｌｔテクノロジー株式会社 | Touch sensor device and electronic apparatus equipped with the same |
-
1997
- 1997-08-28 JP JP24767897A patent/JP3864512B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002151706A (en) * | 2000-11-14 | 2002-05-24 | Sharp Corp | Electric apparatus comprising light-receiving unit |
| US9201556B2 (en) | 2006-11-08 | 2015-12-01 | 3M Innovative Properties Company | Touch location sensing system and method employing sensor data fitting to a predefined curve |
| JPWO2013047227A1 (en) * | 2011-09-27 | 2015-03-26 | シャープ株式会社 | Electronics |
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