JPS5994184A - Pressure-sensitive tablet device - Google Patents

Pressure-sensitive tablet device

Info

Publication number
JPS5994184A
JPS5994184A JP20319082A JP20319082A JPS5994184A JP S5994184 A JPS5994184 A JP S5994184A JP 20319082 A JP20319082 A JP 20319082A JP 20319082 A JP20319082 A JP 20319082A JP S5994184 A JPS5994184 A JP S5994184A
Authority
JP
Japan
Prior art keywords
detection
pressure
electrodes
potential
tablet
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
Application number
JP20319082A
Other languages
Japanese (ja)
Other versions
JPS6029972B2 (en
Inventor
Yuichi Sato
裕一 佐藤
Kenji Akiyama
秋山　健二
Shiyouichi Nakamura
中村　升一
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Nippon Telegraph and Telephone Corp
Original Assignee
Toshiba Corp
Nippon Telegraph and Telephone Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toshiba Corp, Nippon Telegraph and Telephone Corp filed Critical Toshiba Corp
Priority to JP20319082A priority Critical patent/JPS6029972B2/en
Publication of JPS5994184A publication Critical patent/JPS5994184A/en
Publication of JPS6029972B2 publication Critical patent/JPS6029972B2/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/045—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

PURPOSE:To detect a position at high accuracy with simple constitution by making a current that flows in detecting electrodes in the periphery of the body of a tablet constant for each electrode and detecting the potential of the electrode selectively and determining a pressing position of the tablet from the result of detection. CONSTITUTION:Constant current sources 22a-22d are connected between detecting electrodes 5a-5d of a pressure-sensitive tablet and grounding terminal and the current read out from electrodes 5a-5d is made constant independently by the current source 22a-22d. Subtraction circuits 21a, 21b are connected between electrodes 5a and 5b, and 5c and 5d, and the potential difference between electrodes 5a and 5b, and 5c and 5d is detected. This potential difference is outputted as coordinates of X direction and Y direction of pressing position of the tablet. The potential that appears in electrodes 5a, 5b is added to an adder 23 and the result of addition is inputted to a comparator circuit 24 and compared with reference potential of a reference power source 25. When the result of addition is reference potential or less, a detection timing signal CS is outputted to simplify the constitution of the tablet.

Description

【発明の詳細な説明】 本発明は、感圧抵抗体シートを用いたタブレット装置に
係わシ、特にタブレット上の抑圧位置を精度良く検出し
得るようにした感圧型タブレット装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tablet device using a pressure-sensitive resistor sheet, and more particularly to a pressure-sensitive tablet device that can accurately detect a suppressed position on the tablet.

〔発明の技術的背景〕[Technical background of the invention]

従来、情報入力装置のひとつとして、感圧抵抗体シート
を用いてその押圧位置の抵抗変化を利用して情報入力を
行なうものがある。第１図はその構成の一例を示す回路
図である。同図において、感圧抵抗体シート１の上面に
は蒸着やスパッタリング等によ多金属シートからなる導
電層２が形成され、かつ下面には一様な面抵抗を有する
抵抗板３が積層配設されておシ、これらによシタブレッ
ト本体が構成されている。第２図はその積層構造を示す
もので、第１図のＡ−Ａ断面矢視図である。2. Description of the Related Art Conventionally, there is a type of information input device that uses a pressure-sensitive resistor sheet to input information by utilizing a change in resistance at a pressed position. FIG. 1 is a circuit diagram showing an example of its configuration. In the figure, a conductive layer 2 made of a multi-metal sheet is formed by vapor deposition or sputtering on the upper surface of a pressure-sensitive resistor sheet 1, and a resistive plate 3 having a uniform sheet resistance is laminated on the lower surface. The main body of the tablet is made up of these. FIG. 2 shows the laminated structure, and is a cross-sectional view taken along the line A--A in FIG. 1.

さて、上記タブレット本体の導電層２と接地端子との間
には、駆動電圧印加用の電源４が接続されておシ、この
電源４によシ導電層２には常に正の駆動電圧が印加され
ている。一方、前記抵抗板３の各辺部には、それぞれ複
数のダイオードを等間隔に配置し接続した検出電極５ａ
。Now, a power supply 4 for applying a driving voltage is connected between the conductive layer 2 of the tablet body and the ground terminal, and a positive driving voltage is always applied to the conductive layer 2 by this power supply 4. has been done. On the other hand, on each side of the resistance plate 3, a plurality of detection electrodes 5a are arranged and connected at equal intervals.
.

５ｂ、５ｃ、５ｄが設けられている。これらの検出電極
５ａ、５ｂ、５ａ、５ｄは、前記電源４から導電層２お
よび感圧抵抗体シート（以後感圧シートと略称する）１
の抑圧位置を経て抵抗板３に流入する電流を、抵抗板３
の各辺部全域から一様に流出させるだめのものである。5b, 5c, and 5d are provided. These detection electrodes 5a, 5b, 5a, 5d are connected to a conductive layer 2 and a pressure-sensitive resistor sheet (hereinafter abbreviated as pressure-sensitive sheet) 1 from the power source 4.
The current flowing into the resistor plate 3 through the suppression position of the resistor plate 3
This is to ensure that the water flows out uniformly from all sides of the area.

なお、ダイオードは、一旦流出した電流が再び抵抗板３
に還流しないようにするものである。そして、上記各検
出電極５ａ、５ｂ、５ｃ、５ｄは、それぞれ検出抵抗６
ａｒ　６ｂ＋　６ｅ＋　６ｄを介したのち、相対向する
電極５ｍ、５ｂおよび５ａ、５ｄ毎に共通接続され、し
かるのちスイッチ７＊、”Ｉｂを介して１個の定電流源
８に接続されている。この定電流源８は、前記駆動電圧
印加用の電源４の出力電流を一定化するだめのものであ
る。また、上記各検出抵抗６ａ、６ｂ、６ｃ、６ｄのう
ち抵抗６ｂ、６ｃには、その電圧降下を検出するだめの
演算増幅器９ｈ　、９ｂが接続されておシ、これらの演
算増幅器９ｍ、９ｂで検出された電圧値はサンプリング
ホールド回路（ＳＡＴ）　Ｊ　ｏ　ａ　。Note that in the diode, once the current flows out, it flows back into the resistor plate 3.
This is to prevent reflux. Each of the detection electrodes 5a, 5b, 5c, and 5d has a detection resistor 6.
After passing through ar 6b+ 6e+ 6d, the electrodes 5m, 5b and 5a, 5d facing each other are connected in common, and then connected to one constant current source 8 via the switch 7*, "Ib." This constant current source 8 is for making constant the output current of the power supply 4 for applying the drive voltage.Furthermore, among the detection resistors 6a, 6b, 6c, and 6d, the resistors 6b and 6c have the following characteristics: Operational amplifiers 9h and 9b are connected to detect the voltage drop, and the voltage values detected by these operational amplifiers 9m and 9b are transferred to a sampling and hold circuit (SAT).

１０ｂを経て出力されるようになっている。なお、検出
制御回路１１は、前記各スイッチ７ａ。10b. Note that the detection control circuit 11 includes each of the switches 7a.

７ｂを交互に閉成させるとともに、それに合わせて前記
サンプリングホールド回路１０ｍ、１０ｂにサンプリン
グホールド動作を行なわせ、これによシ前記タブレット
本体上の抑圧位置をＸ方向とＹ方向とに分けてそれぞれ
検出するだめのものである。7b is alternately closed, and the sampling and holding circuits 10m and 10b are made to perform a sampling and holding operation accordingly, thereby detecting the suppressed position on the tablet body separately in the X direction and the Y direction. It's worthless.

このような構成であるから、タブレット本体の任意の位
置を指示ペン等で抑圧操作すると、この抑圧位置におけ
る感圧シート１の抵抗値が低下して略短絡状態となる。With such a configuration, when a desired position of the tablet body is depressed using an indicator pen or the like, the resistance value of the pressure sensitive sheet 1 at this suppressed position decreases, resulting in a substantially short-circuited state.

ここで、検出制御回路１１から発せられる制御信号によ
シスイッチ７ａが閉成させているものとすると、上記指
示ペンによる抑圧操作によシ、電源４の出力電流が導電
層２、上記感圧シート１の抑圧位置および抵抗板３を介
して検出電極５ｍ、５ｂから流出し、しかるのち検出抵
抗６ＩＬ、６ｂに流れる。そして、これらの検出抵抗６
ｍ、６ｂのうち、抵抗６ｂの電圧降下が演算増幅器９ｂ
で検出され、この検出値はサンプリングホールド回路１
０ｂで保持される。なお上記各検出抵抗６ａ、６ｂに流
れる電流の和は、定電流源８によシ一定値に規定される
ため、前記各検出抵抗６ｍ、６ｂに流れる電流の比は、
感圧シート１の押圧位置に対応する抵抗板３の抵抗比に
対応５− したものとなる。したがって、前記演算増幅器９ｂによ
シ検出し、サンプリングホールド回路１０ｂで保持した
検出抵抗６ｂの電圧降下の値は、そのままタブレット本
体における押圧位置のＸ方向の座標を示すものとなる。Here, if it is assumed that the switch 7a is closed by the control signal issued from the detection control circuit 11, the output current of the power source 4 will be applied to the conductive layer 2, the pressure sensitive It flows out from the detection electrodes 5m, 5b via the suppressed position of the sheet 1 and the resistance plate 3, and then flows to the detection resistors 6IL, 6b. And these detection resistors 6
m, 6b, the voltage drop across the resistor 6b is the operational amplifier 9b.
This detected value is sent to sampling hold circuit 1.
It is held at 0b. Note that since the sum of the currents flowing through each of the detection resistors 6a and 6b is determined to be a constant value by the constant current source 8, the ratio of the currents flowing through each of the detection resistors 6m and 6b is as follows.
The resistance ratio of the resistance plate 3 corresponding to the pressed position of the pressure sensitive sheet 1 corresponds to 5-. Therefore, the value of the voltage drop across the detection resistor 6b detected by the operational amplifier 9b and held by the sampling and hold circuit 10b directly indicates the X-direction coordinate of the pressed position on the tablet body.

こうして押圧位置のＸ方向の座標が検出されると、検出
制御回路１１から制御信号が出力されてスイッチ７ａに
代わってスイッチ７ｂが閉成する。この結果、今度は電
源４の出力電流は検出電極５ａ、５ｄから流出して検出
抵抗６ｅ。When the X-direction coordinates of the pressed position are detected in this way, a control signal is output from the detection control circuit 11, and the switch 7b is closed instead of the switch 7a. As a result, the output current of the power source 4 flows out from the detection electrodes 5a and 5d and reaches the detection resistor 6e.

６ｄに流れ、検出抵抗６ｃの電圧降下が抑圧位置のＹ方
向の座標を示す情報として演算増幅器９ａによシ検出さ
れる。かくして、押圧位置のＸ方向およびＹ方向の各座
標が検出される。6d, and the voltage drop across the detection resistor 6c is detected by the operational amplifier 9a as information indicating the Y-direction coordinate of the suppression position. In this way, the coordinates of the pressed position in the X and Y directions are detected.

このように、以上のような構成であれば、感圧シート上
の抑圧位置を、つま多入力情報を静電容量形等の他のタ
ブレット装置に比べて比較的簡単に検出することができ
る。In this way, with the above configuration, the suppressed position on the pressure-sensitive sheet and the multiple input information can be detected relatively easily compared to other tablet devices such as a capacitive type.

〔背景技術の問題点〕[Problems with background technology]

しかしながら、前記従来の装置は、１個の定６− 電流源８をスイッチ７ｍ、７ｂを切換えることによシ、
押圧位置のＸ方向およびＹ方向の座標を交互に検出する
ようにしている。このため、上記スイッチ７ｍ、７ｂと
その切換制御用の回路が必要となり、またそればかりか
Ｘ方向およびＹ方向の各検出値を保持するためのサンプ
リングホールド回路１０ｇ、１０ｂが必要となる。However, in the conventional device, one constant 6-current source 8 is operated by switching the switches 7m and 7b.
The coordinates of the pressed position in the X direction and the Y direction are detected alternately. Therefore, the switches 7m and 7b and a circuit for controlling their switching are required, as well as sampling and holding circuits 10g and 10b for holding the detected values in the X direction and the Y direction.

したがって、回路構成が複雑化して実用上好ましくなか
った。また、切換えながら検出を行なうものであるため
、検出値に不安定要素が入シ易く、これ故検出精度の向
上をはかることが難しかった。Therefore, the circuit configuration becomes complicated, which is not practical. Furthermore, since detection is performed while switching, unstable factors are likely to be introduced into the detected values, making it difficult to improve detection accuracy.

〔発明の目的〕[Purpose of the invention]

本発明は、複雑な回路や制御を用いるととなく簡単な構
成で実現でき、しかも精度良く安定性の高い位置検出を
行ない得るようにした感圧型タブレット装置を提供する
ことを目的とする。SUMMARY OF THE INVENTION An object of the present invention is to provide a pressure-sensitive tablet device that can be realized with a fairly simple configuration without using complicated circuits or controls, and can perform highly accurate and stable position detection.

〔発明の概要〕[Summary of the invention]

本発明は、上記目的を達成するために、タブレット本体
の各辺部に設けた検出電極に流れる電流を各検出電極毎
に各別に一定値化し、この状態で各検出電極に表われる
電位を選択的に検出してその検出結果からタブレット本
体における抑圧位置を求めるようにしたものである。In order to achieve the above object, the present invention sets the current flowing through the detection electrodes provided on each side of the tablet body to a constant value for each detection electrode, and selects the potential appearing on each detection electrode in this state. The suppression position on the tablet body is determined from the detection result.

また他の本発明は、各検出電極毎に電流を一定化してそ
のときの各電極の電位から抑圧位置を求めるとともに、
任意の電極に表われる電位の大きさを監視してこの電位
が予め設定した所定値になったとき、このときに得られ
る抑圧位置情報を真の情報とするようにしたものである
。In another aspect of the present invention, the current is made constant for each detection electrode, and the suppression position is determined from the potential of each electrode at that time.
The magnitude of the potential appearing on any electrode is monitored, and when this potential reaches a predetermined value set in advance, the suppression position information obtained at this time is taken as true information.

〔発明の実施例〕[Embodiments of the invention]

第３図は、本発明の一実施例における感圧型タブレット
装置の回路構成図で、前記第１図と同一部分には同一符
号を付して詳しい説明は省略する。FIG. 3 is a circuit diagram of a pressure-sensitive tablet device according to an embodiment of the present invention, in which the same parts as in FIG.

同図において、各検出電極５ａ、５ｂ、５ａ、５ｄと接
地端子との間には、それぞれ定電流源２２ａ。In the figure, a constant current source 22a is provided between each detection electrode 5a, 5b, 5a, 5d and the ground terminal.

２２ｂ、２２ｃ、２２ｄが接続してあシ、これらの定電
流源２２ｍ、２２ｂ、２２ｃ、２２ｄによシ各検出電極
５ａ　＋　５　ｂ　＋　５ｃ　ｒ　５　ｄから流出する
電流はそれぞれ独立して一定化されるようになっている
。また、検出電極５ｍ、６ｂ問および検出電極５ｃ。22b, 22c, and 22d are connected to each other, and the current flowing out from each detection electrode 5a + 5b + 5c r 5 d is independently stabilized by these constant current sources 22m, 22b, 22c, and 22d. It is now possible to do so. In addition, detection electrodes 5m and 6b and detection electrode 5c.

５ｄ間には、それぞれ演算増幅器からなる減算回路２１
ｈ、２１ｂが接続されている。これらの減算回路２１ａ
、２１ｂは、それぞれ前記検出電極５ｍ、５ｂ間の電位
差および検出電極５ｃ、５ｄ間の電位差を検出するだめ
のもので、これらの電位差を前記タブレット本体上にお
ける押圧位置のＸ方向およびＹ方向の座標として出力す
る。さらに、前記各検出電極５ｍ、５ｂ。Between 5d and 5d, there are subtracting circuits 21 each consisting of an operational amplifier.
h, 21b are connected. These subtraction circuits 21a
, 21b are for detecting the potential difference between the detection electrodes 5m and 5b and the potential difference between the detection electrodes 5c and 5d, respectively, and these potential differences are used to calculate the coordinates of the pressed position on the tablet body in the X and Y directions. Output as . Further, each of the detection electrodes 5m and 5b.

５ｃ　、５ｄのうち、検出電極５ｍ　、５ｂに表われる
各電位は演算増幅器を用いた加算回路２３に導びかれ、
この回路２３で加算されるようになっている。なお、こ
の加算回路２３は、加算結果を反転して出力するもので
ある。このような加算回路２３の加算出力は、演算増幅
器からなる比較回路２４に導びかれている。この比較回
路２４は、上記加算回路２３の加算出力を基準電源２５
の出力電圧（基準電圧）と比較して、この基準電圧以下
となったときに１Ｈ”レベル９− の検出タイミング信号Ｃ８を発するものである。Of the detection electrodes 5m and 5d, each potential appearing on the detection electrodes 5m and 5b is led to an addition circuit 23 using an operational amplifier,
This circuit 23 adds the signals. Note that this adder circuit 23 inverts the addition result and outputs it. The added output of the adder circuit 23 is led to a comparator circuit 24 consisting of an operational amplifier. This comparison circuit 24 converts the addition output of the addition circuit 23 into a reference power supply 25.
The detection timing signal C8 of 1H" level 9- is generated when the output voltage (reference voltage) is compared with the output voltage (reference voltage).

仁の検出タイミング信号Ｃ８は、図示しない抑圧位置認
識回路において、前記各減算回路２１ａ。The detection timing signal C8 is sent to each of the subtraction circuits 21a in a suppression position recognition circuit (not shown).

２１ｂで得られた電位差情報を認識する際のタイミング
信号となる。This serves as a timing signal when recognizing the potential difference information obtained in step 21b.

ところで、前記基準電圧は次のように設定される。すな
わち、前記第３図の装置を等価回路で示すと第４図のよ
うになる。なお、図中Ｒｖは感圧シート１の抵抗値を、
またｒｌｌ＋ｒ１３およびｒ２□＋　ｒｇｌは押圧位置
と検出電極５ｇ、５ｂとの間および抑圧位置と検出電極
５ｃ、５ｄとの間の抵抗板３の抵抗値をそれぞれ示して
いる。同図において、感圧シート１の抵抗値Ｒｖは加圧
量が増加するに従って感少するように変化し、加圧量が
少ない状態ではある程度大きな値を有している。このよ
うに、感圧シート１の抵抗値Ｒｖが大きい場合には、定
電流源２２ａの端子間゛電圧ｖ１は ｖ１＝ｖ−ＶＤ−ＩＲｖ−ｉ１ｒ１□ １０− よシ明らかなように小さくなシ、この結果定電流源２２
ｔｈは定電流作用を行なわない。この定電流作用は、感
圧シート１への加圧量が増加して抵抗値Ｒｖが減少し、
これによシ定電流源２２ｍの端子間電圧ｖ１が第５図に
示す如く増加しである値０以上になったときから開始さ
れる。By the way, the reference voltage is set as follows. That is, the equivalent circuit of the device shown in FIG. 3 is shown in FIG. 4. In addition, Rv in the figure represents the resistance value of the pressure-sensitive sheet 1,
Further, rll+r13 and r2□+rgl respectively indicate the resistance values of the resistance plate 3 between the pressing position and the detection electrodes 5g, 5b and between the suppression position and the detection electrodes 5c, 5d. In the figure, the resistance value Rv of the pressure-sensitive sheet 1 decreases as the amount of pressure increases, and has a relatively large value when the amount of pressure is small. In this way, when the resistance value Rv of the pressure-sensitive sheet 1 is large, the voltage v1 between the terminals of the constant current source 22a is v1=v-VD-IRv-i1r1□ 10- As is clear from this, a small series , as a result, the constant current source 22
th does not perform constant current action. This constant current action increases the amount of pressure applied to the pressure sensitive sheet 1 and decreases the resistance value Rv.
As a result, the voltage v1 between the terminals of the constant current source 22m increases as shown in FIG. 5, and starts when it reaches a certain value of 0 or more.

一方前記感圧シート１への加圧量が少なく抵抗値の大き
い状態では、反転増幅器からなる加算回路２３の出力電
圧Ｖ２は飽和状態となっている。そして、この出力電圧
ｖ２は、感圧シートＩの加圧量を増加するに従って第５
図に示す如く低下する。つまシ、この加算回路２３の出
力電圧ｖ２の変化は、前記定電流源２２ａの端子間電圧
ｖｌの変化に略対応する。なお、この相互関係は、定電
流源２２ｂ、２２ｃ、２２ｄにおいても同様である。On the other hand, when the amount of pressure applied to the pressure-sensitive sheet 1 is small and the resistance value is large, the output voltage V2 of the adder circuit 23 consisting of an inverting amplifier is in a saturated state. As the amount of pressure applied to the pressure-sensitive sheet I increases, this output voltage v2 changes to a fifth value.
It decreases as shown in the figure. Finally, a change in the output voltage v2 of the adder circuit 23 substantially corresponds to a change in the inter-terminal voltage v1 of the constant current source 22a. Note that this mutual relationship is the same for the constant current sources 22b, 22c, and 22d.

したがって、前記定電流源２２ａ　、　２２ｂ　１２２
０１２２ｄが十分な定電流作用を行なうに必要な感圧シ
ート１の加圧量に対応する加算回路２３の出力電圧Ｖ！
を、前記基準電圧（第５図中ｖ８）とすればよい。Therefore, the constant current sources 22a, 22b 122
The output voltage V of the adder circuit 23 corresponding to the amount of pressure applied to the pressure-sensitive sheet 1 necessary for 0122d to perform a sufficient constant current action!
may be set as the reference voltage (v8 in FIG. 5).

次に以上のように構成された装置の作用を説明する。指
示ペン等によりタブレット本体上の任意の点を抑圧操作
すると、との押圧位置における感圧シート１の抵抗値が
低下し、この結果電源４の出力電流が導電層２、上記感
圧シート１の抑圧位置、抵抗板３および各検出電極５　
ａ。Next, the operation of the apparatus configured as above will be explained. When an arbitrary point on the tablet body is pressed with an indicator pen or the like, the resistance value of the pressure-sensitive sheet 1 at the pressed position decreases, and as a result, the output current of the power source 4 increases from the conductive layer 2 to the pressure-sensitive sheet 1. Suppression position, resistance plate 3 and each detection electrode 5
a.

５ｂ、５ｃ、５ｄをそれぞれ介して各定電流源２２ｍ、
２２ｂ、２２ｃ、２２ｄに流れる。っまシ、すべての検
出電極５＠、５ｂ、５ｃ、５ｄに同時に電流が流れる。5b, 5c, and 5d, each constant current source 22m,
22b, 22c, and 22d. Current flows simultaneously to all detection electrodes 5@, 5b, 5c, and 5d.

そして、これらの各検出電極５ｍ。And each of these detection electrodes is 5m long.

５ｂ、５ｃ、５ｄに流れる電流は、感圧シート１への加
圧量がある大きさ以上であれば、定電流源２２＊、２２
ｂ、２２ｃ、２２ｄにより一定化されたものと々る。If the amount of pressure applied to the pressure sensitive sheet 1 is greater than or equal to a certain level, the current flowing through the constant current sources 22*, 22
b, 22c, and 22d.

一方、上記のように感圧シート１の抵抗値が減少すると
、検出電極５ｍ、６ｂおよび検出電力５ｃ、５ｄには、
各検出電極５＊、５ｂ、５ａｒ５ｄを流れる電流が一定
であるため、抑圧位置と各検出電極５ｍ、５ｂ、５ｃ、
５ｔｌとの間の抵抗板３の抵抗値ｒｌｌ　ｒ　ｒｔｔ　
ｌ　ｒ２１　Ｔ　ｒ２□に対応する電位が表われる。そ
して、これらの電位は、検出電極５ｍ、５ｂのものが減
算回路２１ｍに、また検出電極５ｃ、５ｄのものが減算
回路２１ｂにそれぞれ導入され、これらの減算回路２１
ａ。On the other hand, when the resistance value of the pressure sensitive sheet 1 decreases as described above, the detection electrodes 5m, 6b and the detection power 5c, 5d have
Since the current flowing through each detection electrode 5*, 5b, 5ar5d is constant, the suppression position and each detection electrode 5m, 5b, 5c,
The resistance value of the resistor plate 3 between 5tl rll r rtt
A potential corresponding to l r21 T r2□ appears. These potentials are introduced into the subtraction circuit 21m by those of the detection electrodes 5m and 5b, and into the subtraction circuit 21b by those of the detection electrodes 5c and 5d.
a.

２１ｂで差が求められる。このとき、各減算回路２１＆
、２１ｂから出力される電位差Ｖ３＋Ｖ４は、それぞれ ＶＢ　＝　ｉ！（ｒｌ　−２ｒｌｌ　）Ｖ４　：＝＝ｔ
ｚ　（ｒ２　２ｒ２ｔ）であられされる。ただし、 ｒ　ｌ　””　ｒｌｌ　＋　ｒｔｇ ｒ　２　””　ｒ２１　＋　ｒｚｚ である。また、上記電位差Ｖ８ｅ■４は、押圧位置に応
じて第６図に示す如＜　　ｊｔｒｘ（−ｊｚｒｇ）から
＋ｊｌｒｌ（＋ｊ２ｒ２）まで変化する。しかして、上
記各電位差ｖ３１　ｖ４はタブレット本体上のＸ方向お
よびＹ方向の座標と対応することになシ、シたがって上
記電位差ｖ３１　ｖ４をもって抑圧位置とすることがで
きる。The difference is determined at 21b. At this time, each subtraction circuit 21&
, 21b, the potential difference V3+V4 is VB = i! (rl −2rll )V4 :==t
z (r2 2r2t). However, r l "" rll + rtg r 2 "" r21 + rzz. Further, the potential difference V8e4 changes from <jtrx (-jzrg) to +jlrl (+j2r2) as shown in FIG. 6 depending on the pressing position. Therefore, each of the potential differences v31 to v4 corresponds to the coordinates in the X direction and the Y direction on the tablet body, and therefore, the potential difference v31 to v4 can be set as the suppression position.

１３− また、前記検出電極５ｍ、６ｂの各電位は加算回路２３
で加算され、比較回路２４で基準電圧ｖｓと比較される
。そして、上記加算回路２３の加算出力Ｖ、が基準電圧
Ｖｓよシも低くなると、つまシ各定電流源２２＊、２２
ｂ、２２ｅ、２２ｄが安定な定電流作用を行ない得る値
に感圧シート１の加圧量が達したとき、比較回路２４が
らは”Ｈ″レベル検出タイミング信号ｃｓが発生される
。この結果、位置認識回路（図示せず）では、上記検出
タイミング信号ＣＳの発生以前に各減算回路２１ｍ、２
１ｂから出力された電位差値についてはｕｗｔせずに、
上記検出タイミング信号Ｃ８が発生された時点での電位
差値を真の位置検出情報として認識する。13- Also, each potential of the detection electrodes 5m and 6b is determined by an adding circuit 23.
and is compared with the reference voltage vs in the comparator circuit 24. Then, when the addition output V of the addition circuit 23 becomes lower than the reference voltage Vs, the respective constant current sources 22*, 22
When the amount of pressure applied to the pressure sensitive sheet 1 reaches a value at which the voltages b, 22e, and 22d can perform a stable constant current action, the comparator circuit 24 generates an "H" level detection timing signal cs. As a result, in the position recognition circuit (not shown), each subtraction circuit 21m, 2
The potential difference value output from 1b is not uwt,
The potential difference value at the time when the detection timing signal C8 is generated is recognized as true position detection information.

このように、本実施例の装置であれば、各検出電極５ｍ
、５ｂ、５ｃ、５ｄから流出する電流を、各電極毎に各
別に定電流源２２ｍ、２２ｂ、２２ｅ。In this way, with the device of this embodiment, each detection electrode has a length of 5 m.
, 5b, 5c, and 5d through constant current sources 22m, 22b, and 22e for each electrode.

２２ｒｌによシー重化するようにし、この状態で検出電
極５＊、５ｂおよび検出電極５ｃ、５ｄの電位差をそれ
ぞれ検出してこれを押接位置の１４− 座標情報としたので、従来装置のようにＸ方向とＹ方向
とで検出期間を分けることなく、各方向の座標情報を同
時に検出することができる。22rl, and in this state, the potential difference between the detection electrodes 5*, 5b and the detection electrodes 5c, 5d was detected, and this was used as the 14-coordinate information of the pressing position. Coordinate information in each direction can be detected simultaneously without separating the detection period in the X direction and the Y direction.

このため、スイッチおよびサンプリングホールド回路や
これらを制御するための回路が不要となシ、これによシ
構成の簡単化をはかることができる。また、検出期間を
分けずに電流等の安定した状態で検出を行なえるので、
検出精度を高めることができる。さらに、本実施例であ
れば、検出電極５ａ、５ｂに表われる電位の加算値が基
準電圧ｖｓになったとき、減算回路２１ａ。Therefore, there is no need for a switch, a sampling hold circuit, or a circuit for controlling these, thereby simplifying the configuration. In addition, since detection can be performed in stable conditions such as current without dividing the detection period,
Detection accuracy can be improved. Furthermore, in this embodiment, when the sum of the potentials appearing on the detection electrodes 5a and 5b reaches the reference voltage vs, the subtraction circuit 21a.

２１ｂの出力電圧を真の位置検出情報として認識するよ
うにしたので、各定電流源が十分に定電流作用を行なっ
ている状態で位置検出情報を得ることができ、この結果
よシ一層の検出精度の向上および安定性の向上をはかる
ことができる。また本実施例では、抑圧位置の検出を、
相対向する電極５ａ、５ｂおよび５ｃ、５ｄの電位差を
それぞれ求めることによシ行なっているので、例えば電
極５ａ４るいは５Ｃのみの電位を位置情報とする場合に
比べて、感圧シート１の抵抗値Ｒｖによる電圧降下やダ
イオードによる電圧降下■。を相殺することができ、こ
の結果検出精度をよシ高めることができる。Since the output voltage of 21b is recognized as true position detection information, position detection information can be obtained in a state where each constant current source is sufficiently performing constant current action, and as a result, the detection is further improved. It is possible to improve accuracy and stability. In addition, in this embodiment, detection of the suppression position is performed by
Since this is performed by determining the potential difference between the opposing electrodes 5a, 5b, 5c, and 5d, the resistance of the pressure-sensitive sheet 1 is smaller than, for example, when the potential of only the electrodes 5a4 or 5C is used as position information. Voltage drop due to value Rv and voltage drop due to diode■. can be canceled out, and as a result, detection accuracy can be greatly improved.

なお、本発明は上記実施例に限定されるものではない。Note that the present invention is not limited to the above embodiments.

例えば、検出電極を流れる電流の向きを逆に設定しても
よい。その他、検出電極や電位から抑圧位置を求めるた
めの演算回路、検出制御回路の構成等についても、本発
明の要旨を逸脱しない範囲で種々変形して実施できる。For example, the direction of the current flowing through the detection electrode may be set in the opposite direction. In addition, the configurations of the detection electrodes, the arithmetic circuit for determining the suppression position from the potential, the detection control circuit, etc. can be modified in various ways without departing from the gist of the present invention.

〔発明の効果〕〔Effect of the invention〕

以上詳述したように、本発明は検出電極に流れる電流を
、各検出電極毎に定電流源により一定化し、この状態で
各検出電極に表われる電位からタブレット本体上の押圧
位置を検出するようにしたもの、およびそれに加えて検
出電極に表われる電位の大きさを監視してこの電位が予
め設定した所定値になったときに得られる抑圧位置情報
を真の情報として認識するようにしたものである。As described in detail above, the present invention stabilizes the current flowing through the detection electrodes using a constant current source for each detection electrode, and detects the pressed position on the tablet body from the potential appearing on each detection electrode in this state. In addition to this, the magnitude of the potential appearing on the detection electrode is monitored and the suppression position information obtained when this potential reaches a preset value is recognized as true information. It is.

したがって本発明によれば、複雑な回路や制御を用いる
ことなく簡単な構成で実現でき、しかも精度良く安定性
の高い位置検出を行ない得る感圧型タブレット装置を提
供することができる。Therefore, according to the present invention, it is possible to provide a pressure-sensitive tablet device that can be realized with a simple configuration without using complicated circuits or controls, and can perform highly accurate and stable position detection.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図および第２図は従来における感圧型タブレット装
置の構成を示すもので、第１図はその回路構成図、第２
図は第１図のＡ−Ａ断面矢視図、第３図〜第６図は本発
明の一実施例を示すもので、第３図はその回路構成図、
第４図は第３図に示した装置の等価回路図、爾５図およ
び第６図は第３図に示した装置の作用説明に用いるだめ
の電圧波形図である。 １・・・感圧シート、２・・・導電層、３・・・抵抗板
、４・・・駆動電圧印加用の電源、５ｈＨ５ｂｐ５ｃｐ
５ｄ・・・検出電極、２１ａ、２１ｂ・・・減算回路、
２２ｍ、２２ｂ、２２ｃ、２２ｄ一定電流源、２３　・
・・加算回路、２４・・・比較回路、卦５・・・基°単
電源。 １７一Figures 1 and 2 show the configuration of a conventional pressure-sensitive tablet device; Figure 1 is its circuit configuration diagram;
The figure is a cross-sectional view taken along the line A-A in FIG. 1, and FIGS. 3 to 6 show an embodiment of the present invention, and FIG.
4 is an equivalent circuit diagram of the device shown in FIG. 3, and FIGS. 5 and 6 are voltage waveform diagrams used to explain the operation of the device shown in FIG. 3. DESCRIPTION OF SYMBOLS 1... Pressure sensitive sheet, 2... Conductive layer, 3... Resistance plate, 4... Power supply for driving voltage application, 5hH5bp5cp
5d...detection electrode, 21a, 21b...subtraction circuit,
22m, 22b, 22c, 22d constant current source, 23 ・
...Addition circuit, 24...Comparison circuit, 5...Basic single power supply. 17-1

Claims (2)

【特許請求の範囲】[Claims] （１）　　一方面に導電層が形成されるとともに他方面
に抵抗体層が形成された感圧抵抗体シートを有するタブ
レット本体と、前記抵抗体層の各辺全域にそれぞれ設け
られた検出電極と、これらの検出電極と前記導電層との
間に駆動電圧を印加する駆動電圧印加回路と、前記駆動
電圧の印加によシ前記各検出電極に流れる電流を各電極
毎に各別に一定化する定電流源回路と、前記各検出電極
に表われる電位から前記タブレット本体の抑圧位置を検
出する演算回路とを具備したことを特徴とする感圧型タ
ブレット装置。(1) A tablet body having a pressure-sensitive resistor sheet having a conductive layer formed on one side and a resistor layer formed on the other side, and a detection electrode provided on each side of the resistor layer. , a drive voltage application circuit that applies a drive voltage between these detection electrodes and the conductive layer, and a constant current that flows through each of the detection electrodes by applying the drive voltage to a constant value for each electrode. A pressure-sensitive tablet device comprising: a current source circuit; and an arithmetic circuit that detects a suppressed position of the tablet body from the potential appearing on each of the detection electrodes. （２）一方面に導電層が形成されるとともに他方面に抵
抗体層が形成された感圧抵抗体シートを有するタブレッ
ト本体と、前記抵抗体層の各辺全域にそれぞれ設けられ
た検出電極と、これらの検出電極と前記導電層との間に
駆動電圧を印加する駆動電圧印加回路と、前記駆動電圧
の印加によシ前記各検出電極に流れる電流を各電極毎に
各別に一定化する定電流源回路と、前記各検出電極に表
われる電位から前記タブレット本体の抑圧位置を検出す
る演算回路と、前記検出電極に表われる電位の大きさを
監視しこの電位が予め設定しである所定値になったとき
に前記演算回路で得られた検出結果を真の抑圧位置と判
断する検出制御回路とを具備したことを特徴とする感圧
型タブレット装置。(2) A tablet body having a pressure-sensitive resistor sheet with a conductive layer formed on one side and a resistor layer formed on the other side, and a detection electrode provided on each side of the resistor layer. , a drive voltage application circuit that applies a drive voltage between these detection electrodes and the conductive layer, and a constant current that flows through each of the detection electrodes by applying the drive voltage to a constant value for each electrode. a current source circuit, an arithmetic circuit that detects the suppressed position of the tablet body from the potential appearing on each of the detection electrodes, and a predetermined value that monitors the magnitude of the potential that appears on the detection electrode so that this potential is a preset value. A pressure-sensitive tablet device comprising: a detection control circuit that determines the detection result obtained by the arithmetic circuit as a true suppression position when
JP20319082A 1982-11-19 1982-11-19 Pressure sensitive tablet device Expired JPS6029972B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP20319082A JPS6029972B2 (en) 1982-11-19 1982-11-19 Pressure sensitive tablet device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP20319082A JPS6029972B2 (en) 1982-11-19 1982-11-19 Pressure sensitive tablet device

Publications (2)

Publication Number Publication Date
JPS5994184A true JPS5994184A (en) 1984-05-30
JPS6029972B2 JPS6029972B2 (en) 1985-07-13

Family

ID=16469949

Family Applications (1)

Application Number Title Priority Date Filing Date
JP20319082A Expired JPS6029972B2 (en) 1982-11-19 1982-11-19 Pressure sensitive tablet device

Country Status (1)

Country Link
JP (1) JPS6029972B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5518078A (en) * 1991-11-08 1996-05-21 Sharp Kabushiki Kaisha Coordinates input device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5518078A (en) * 1991-11-08 1996-05-21 Sharp Kabushiki Kaisha Coordinates input device

Also Published As

Publication number Publication date
JPS6029972B2 (en) 1985-07-13

Similar Documents

Publication Publication Date Title
US9523725B2 (en) Configurable analog front-end for mutual capacitance sensing and self capacitance sensing
US8148652B2 (en) Position detecting device and position detecting method
JP2000047808A (en) Depression detecting and electrostatic capacity type coordinate detecting device
JPH05241717A (en) Touch panel device
US9904426B2 (en) Capacitive type touch input device with compensation circuit for stray capacitance
US4080514A (en) Graphical input apparatus for electrical equipment
JPS5994184A (en) Pressure-sensitive tablet device
JP3201873B2 (en) Method and apparatus for detecting coordinates of resistance pressure-sensitive tablet
JPH0854977A (en) Resistance film type touch panel
JPS6130289B2 (en)
JPS616725A (en) Input position detector
JP3116631B2 (en) Coordinate input device
JPS63208923A (en) Handwriting input device
JPS61118826A (en) Touch panel device
JPS62130420A (en) Coordinate detector
JPH05265632A (en) Touch panel device
JPH0654458B2 (en) Touch panel input device
JPH0535392A (en) Tablet device
JPS605009B2 (en) Resistive membrane split type coordinate input device
JPH0113124B2 (en)
JPS6261967B2 (en)
CN116243822A (en) Touch display panel and driving method thereof
JPS6133528A (en) Coordinate detector
JP4879388B2 (en) Tablet device
JP2542953Y2 (en) Touch panel device