JP3163731B2 - Coordinate input device - Google Patents
Coordinate input deviceInfo
- Publication number
- JP3163731B2 JP3163731B2 JP9079092A JP9079092A JP3163731B2 JP 3163731 B2 JP3163731 B2 JP 3163731B2 JP 9079092 A JP9079092 A JP 9079092A JP 9079092 A JP9079092 A JP 9079092A JP 3163731 B2 JP3163731 B2 JP 3163731B2
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- coordinate
- value
- electrodes
- 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.)
- Expired - Lifetime
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Description
【０００１】[0001]
【産業上の利用分野】本発明は、座標入力装置に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coordinate input device.
【０００２】[0002]
【従来の技術】従来の互いに直交するように形成された
複数の電極に順次走査信号を印加し、走査電極との空間
距離に依存する電気的結合度の大小に従って階段状に変
化する座標指示ペンにおける検出信号強度を利用してそ
の位置座標を求める方法としては、走査電極に対応して
検出される信号強度をそれぞれ走査電極の中心位置の座
標値における関数値とみなし、その最大値付近を適当な
関数で近似し、その関数が極大値となる座標を求める方
法が知られている。2. Description of the Related Art Conventionally, a scanning signal is sequentially applied to a plurality of electrodes formed so as to be orthogonal to each other, and the coordinate pointing pen changes stepwise according to the degree of electrical coupling depending on the spatial distance to the scanning electrodes. As a method of obtaining the position coordinates using the detected signal strength in the above, the signal strength detected corresponding to the scanning electrode is regarded as a function value in the coordinate value of the center position of the scanning electrode, and the vicinity of the maximum value is appropriately determined. A method is known in which the coordinates are approximated by a simple function and the coordinates at which the function has a local maximum value.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら上記従来
技術では必要な分解能、精度を得るためには、信号強度
をデジタル値に変換するためのＡ／Ｄコンバーターに高
分解能のものを使用する必要があり、また、ＣＰＵでの
処理も乗除算を多用した２次以上の関数による近似を行
うため処理時間がかかってしまい単位時間あたりの位置
座標読み取り数が制限されてしまうという問題点を有す
る。However, in the above prior art, in order to obtain the required resolution and accuracy, it is necessary to use a high resolution A / D converter for converting the signal strength into a digital value. Also, the processing in the CPU involves approximation by a quadratic or higher-order function that makes extensive use of multiplication and division, which requires a long processing time and limits the number of position coordinate readings per unit time.
【０００４】そこで本発明はこのような問題点を解決す
るもので、その目的とするところは必要な分解能、精度
を確保しつつ単位時間あたりの位置座標読み取り数の多
い座標入力装置を提供するところにある。Accordingly, the present invention is to solve such a problem, and an object of the present invention is to provide a coordinate input device which has a large number of position coordinate readings per unit time while securing necessary resolution and accuracy. It is in.
【０００５】[0005]
【課題を解決するための手段】本発明の座標入力装置
は、並行して配列された複数のＸ電極と該Ｘ電極と略直
交する方向に並行して配列された複数のＹ電極および該
Ｙ電極と前記Ｘ電極を絶縁する絶縁層からなるタブレッ
トと、前記Ｘ電極とＹ電極のそれぞれに所定の信号を所
定期間にわたって順次印加する電極駆動回路と、前記タ
ブレットに電極を近接、あるいは当接することにより得
られた検出信号に基づき位置座標を出力する位置検出手
段とを備えた座標入力装置であって、前記位置検出手段
は、前記各所定期間における代表値として検出される前
記検出信号に基ずき前記各所定期間における前記代表値
中の最大値によってしきい値を決定するとともに、該し
きい値を跨ぐ前後２つの前記代表値をもとに座標値にお
ける関数値として補間する関数に近似し、該関数と前記
しきい値との交点２箇所の座標値の中点を算出すること
によって前記位置座標を出力することを特徴とする。According to the present invention, there is provided a coordinate input apparatus comprising: a plurality of X electrodes arranged in parallel; a plurality of Y electrodes arranged in parallel in a direction substantially orthogonal to the X electrodes; A tablet made of an insulating layer that insulates the electrode and the X electrode; an electrode driving circuit that sequentially applies a predetermined signal to each of the X electrode and the Y electrode over a predetermined period; and bringing the electrode close to or in contact with the tablet And a position detecting means for outputting position coordinates based on the detection signal obtained by the step (a), wherein the position detecting means detects a position coordinate based on the detection signal detected as a representative value in each of the predetermined periods. A threshold value is determined based on the maximum value of the representative values in each of the predetermined periods, and is supplemented as a function value in coordinate values based on the two representative values before and after the threshold value. Approximate function, and outputs the position coordinates by calculating the midpoint of the coordinate values of the intersection two places of the threshold and the function number.
【０００６】[0006]
【実施例】以下、実施例を用いて本発明を説明する。The present invention will be described below with reference to examples.
【０００７】［実施例１］実施例として画素ピッチ０．
３ｍｍ、表示容量６４０×４８０画素の液晶表示装置上
に組み合わせ可能な透明タイプのものを示す。[Embodiment 1] As an embodiment, a pixel pitch of 0.1 is used.
A transparent type that can be combined on a liquid crystal display device having a display capacity of 3 mm and a display capacity of 640 × 480 pixels is shown.
【０００８】まず図１に従って本実施例の構成を説明す
る。タブレット１はＸ電極としてピッチ２．５ｍｍ、幅
０．１ｍｍの８０本の透明電極を形成した１．１ｍｍ厚
のガラス基板（ａ）、Ｙ電極としてピッチ２．５ｍｍ、
幅２．４ｍｍの６０本の透明電極を形成したガラス基板
（ｂ）を透明電極面を内側とし、厚さ０．２ｍｍ前のポ
リエステルフィルムを挟んでＸ電極とＹ電極が互いに直
交する向きに貼合わせたものであり、ガラス基板（ａ）
の側が入力面、すなわち後述する座標指示ペン５が近接
あるいは当接する面となる。駆動回路２は各Ｘ電極、Ｙ
電極にそれぞれ接続されて後述する１チップマイコン３
より発生される制御信号に従って各Ｘ電極、Ｙ電極に所
定の信号を印加するためのものであり、本実施例では出
力数８０の液晶コモン駆動用ＩＣを用いた。１チップマ
イコン３は８ビットのＣＰＵ３１、８ビットのＡ／Ｄコ
ンバーター３２、Ｉ／Ｏポート３３、ＲＡＭ３４を１チ
ップに収めたものであり、汎用のものを用いた。ＲＯＭ
４は１チップマイコン３と接続され、プログラムが格納
される。座標指示ペン５は樹脂に覆われた金属製の検出
電極５１を先端とし、内部には検出電極５１よりの信号
を入力とする増幅回路５２を設けた構成とした。なお、
増幅回路５２の入力は１ＭΩの抵抗５３を介して接地し
てある。ケーブル６は座標指示ペン５と本体を電気的に
接続するためのものであり、座標指示ペン５の操作に支
障の無いよう細く柔らかい材質ものを使用した。波形整
形増幅回路７は汎用オペアンプを用いた増幅回路、積分
回路、レベルシフト回路により構成し、座標指示ペン５
よりの信号を入力仕様に見合った信号へと変換して前述
したＡ／Ｄコンバーター３２へ入力する。そしてホスト
コンピューターは８が本座標入力装置よりの位置座標デ
ーターの受け取り手である。以上が本実施例における全
体構成である。First, the configuration of this embodiment will be described with reference to FIG. Tablet 1 is a 1.1 mm thick glass substrate (a) on which 80 transparent electrodes having a pitch of 2.5 mm and a width of 0.1 mm are formed as X electrodes, and a pitch of 2.5 mm as a Y electrode.
A glass substrate (b) on which 60 transparent electrodes having a width of 2.4 mm are formed, the X electrode and the Y electrode are bonded in a direction perpendicular to each other with the transparent electrode surface inside and a polyester film 0.2 mm in thickness before. Glass substrate (a)
Is an input surface, that is, a surface to which a coordinate pointing pen 5 described later approaches or abuts. The drive circuit 2 is provided for each X electrode,
One-chip microcomputer 3 connected to electrodes and described later
This is for applying a predetermined signal to each of the X electrode and the Y electrode according to the control signal generated from the control signal. In this embodiment, a liquid crystal common drive IC having 80 outputs is used. The one-chip microcomputer 3 includes an 8-bit CPU 31, an 8-bit A / D converter 32, an I / O port 33, and a RAM 34 in one chip, and is a general-purpose one. ROM
4 is connected to the one-chip microcomputer 3 and stores a program. The coordinate pointing pen 5 has a configuration in which a metal detection electrode 51 covered with resin is used as a tip, and an amplification circuit 52 to which a signal from the detection electrode 51 is input is provided inside. In addition,
The input of the amplifier circuit 52 is grounded via a 1 MΩ resistor 53. The cable 6 is for electrically connecting the coordinate pointing pen 5 to the main body, and is made of a thin and soft material so as not to hinder the operation of the coordinate pointing pen 5. The waveform shaping amplifier circuit 7 includes an amplifier circuit using a general-purpose operational amplifier, an integrating circuit, and a level shift circuit.
This signal is converted into a signal that meets the input specifications and input to the A / D converter 32 described above. The host computer 8 is a receiver of the position coordinate data from the present coordinate input device. The above is the overall configuration in the present embodiment.
【０００９】次に図２を使って動作の説明する。まず左
からｎ番目のＸ電極をＸ（ｎ）、上からｎ番目のＹ電極
をＹ（ｎ）電極と定める。すなわちＸ（１）電極からＸ
（８０）電極、Ｙ（１）電極からＹ（６０）電極が存在
する。Ｘ（ｎ）電極への印加電圧波形をＸｎ、Ｙ（ｎ）
電極への印加電圧波形をＹｎとして図２中に示した。ま
ず、前述のＣＰＵ３１の制御信号に従った駆動回路２の
動作により、Ｘ（１）電極からＸ（８０）電極までが一
定期間ｔづつ順次選択されてゆく。この一連のＸ電極走
査期間中に同時に選択される電極は１つであり、それ以
外の電極は非選択となっている。前述した期間ｔを３０
μｓとし、各電極には選択期間、非選択期間それぞれに
＋５Ｖ、−５Ｖが印加されるようにした。と同時に座標
指示ペン５より波形整形増幅回路７を介してＡ／Ｄコン
バーター３２に入力された信号はＣＰＵ３１によって期
間ｔに付き１度の割合で発行される変換命令に従って逐
次デジタルデーターに変換され、そのデーターはＣＰＵ
３１によってどの電極の選択期間中に対応したデーター
かがわかる形でＲＡＭ３４に記憶されてゆく。Ｘ電極走
査期間が終了するとＣＰＵ３１はその期間中にＲＡＭ３
４に記憶したデーター中から最大値のものを検索する。
求められた最大値が周囲ノイズ等の影響を加味して経験
的に決定される一定のしきい値Ｖｔｈに満たなければ、
座標指示ペン５はタブレット１に近接あるいは当接して
いないと判断して以上の動作を求められた最大値がしき
い値以上となるまでくり返し行う。この期間中、座標指
示ペン５がタブレット１に近接あるいは当接していれば
検出電極５１上には各電極との間の容量結合による電圧
信号が現れ、結果、前述の最大値はしきい値以上とな
る。この条件が満たされるとＣＰＵ３１は座標指示ペン
５のＸ位置座標を求めるための演算を開始する。Next, the operation will be described with reference to FIG. First, the nth X electrode from the left is defined as X (n), and the nth Y electrode from the top is defined as a Y (n) electrode. That is, from the X (1) electrode, X
There are (80) electrode and Y (1) electrode to Y (60) electrode. The waveform of the voltage applied to the X (n) electrode is Xn, Y (n)
The waveform of the voltage applied to the electrode is shown in FIG. 2 as Yn. First, the operation from the X (1) electrode to the X (80) electrode is sequentially selected for a certain period t by the operation of the drive circuit 2 according to the control signal of the CPU 31 described above. One electrode is simultaneously selected during this series of X electrode scanning periods, and the other electrodes are not selected. The aforementioned period t is set to 30
μs, and +5 V and −5 V are applied to each electrode during the selection period and the non-selection period, respectively. At the same time, a signal input from the coordinate pointing pen 5 to the A / D converter 32 via the waveform shaping amplifier circuit 7 is sequentially converted into digital data by the CPU 31 in accordance with a conversion command issued once per period t. The data is CPU
31 is stored in the RAM 34 in such a manner that it is possible to determine which electrode corresponds to the data during the selection period. When the X-electrode scanning period ends, the CPU 31 sets the RAM 3 during that period.
4 is searched for the data having the maximum value.
If the obtained maximum value does not reach a certain threshold value Vth empirically determined in consideration of the influence of ambient noise and the like,
The coordinate pointing pen 5 determines that it is not approaching or in contact with the tablet 1 and repeats the above operation until the calculated maximum value becomes equal to or greater than the threshold value. During this period, if the coordinate indicating pen 5 is close to or in contact with the tablet 1, a voltage signal appears on the detection electrode 51 due to the capacitive coupling between each electrode, and as a result, the maximum value is equal to or larger than the threshold value. Becomes When this condition is satisfied, the CPU 31 starts an operation for obtaining the X position coordinates of the coordinate pointing pen 5.
【００１０】ここで座標指示ペンがＸ（３）電極とＸ
（４）電極の間、Ｘ（３）電極寄りに位置した場合の検
出電極における電圧信号波形をＡ、Ａ／Ｄコンバーター
３２への入力信号波形をＢ、ＣＰＵ３１より変換命令が
発行されるタイミングをＣとして図２中に示した。信号
波形ＢのタイミングＣにおける電圧値の変化としてはＸ
（１）電極選択時からＸ（６）電極選択時までの期間が
大きく、以降のＸ（７）電極選択時から前記Ｘ（８０）
電極選択時に至る期間においてはほとんど変化が無いこ
とがわかる。このことにより前述したデーターの最大値
とその前後のたかだか２つづつの合計５つのデーターよ
り座標指示ペン５のＸ位置座標の決定が可能であること
がわかる。Here, the coordinate pointing pen is an X (3) electrode and X
(4) The voltage signal waveform at the detection electrode when the electrode is located near the X (3) electrode between the electrodes is A, the input signal waveform to the A / D converter 32 is B, and the timing at which the CPU 31 issues a conversion command. C is shown in FIG. The change in the voltage value at the timing C of the signal waveform B is X
(1) The period from when the electrode is selected to the time when the X (6) electrode is selected is long, and after the time when the X (7) electrode is selected, the X (80) is selected.
It can be seen that there is almost no change in the period up to the time of electrode selection. From this, it is understood that the X position coordinates of the coordinate pointing pen 5 can be determined from the maximum value of the above-mentioned data and at most two data before and after the maximum value of the five data.
【００１１】以下に座標指示ペンのＸ位置座標を求める
演算方法を説明する。まず前述したデーターの最大値を
Ｄｍａｘ、このデーターの取得時に選択となっていた電
極をＸ（ｎ）電極として、Ｘ（ｎ−２）電極選択時から
Ｘ（ｎ＋２）電極選択時に得られたデーター値をそれぞ
れＤ（ｎ−２）からＤ（ｎ＋２）と定義する。この定義
により、座標値がｎのとき最大となるデーターがＤｎと
されることになるからＤｎ＝Ｄｍａｘとなる。A method for calculating the X position coordinates of the coordinate pointing pen will be described below. First, the maximum value of the above-mentioned data is Dmax, and the electrode selected at the time of acquiring this data is set as the X (n) electrode, and the data obtained at the time of selecting the X (n−2) electrode to the X (n + 2) electrode. The values are defined as D (n−2) to D (n + 2), respectively. According to this definition, when the coordinate value is n, the maximum data is Dn, so that Dn = Dmax.
【００１２】Ｄｃ＝Ｄｎ×０．６としてしきい値Ｄｃを
求める。各所定期間ｔに代表値として検出されるＤ（ｎ
−２）からＤ（ｎ−１）までのデーターにおいて、この
しきい値Ｄｃを跨ぐ２つのデーターをそれぞれＤ
（ｍ），Ｄ（ｍ＋１）とおいて Ｄ（ｍ）＜Ｄｃ≦Ｄ（ｍ＋１） または、 Ｄ（ｍ）＞Ｄｃ≧Ｄ（ｍ＋１） の条件が成立する座標値ｍを求める。Ｄ（ｎ−２）から
Ｄ（ｎ＋２）までが正常なデーターであれば、この座標
値ｍは２個存在するからそれをｍ１，ｍ２とする。一方
の座標値ｍをｍ１とすると、しきい値Ｄｃを跨ぐ２つの
座標値ｍ１，ｍ１＋１におけるデーターを関数値として
Ｄ（ｍ１），Ｄ（ｍ１＋１）に補間し、座標値ｍ１，ｍ
１＋１の２点を結ぶ関数は ｛Ｄｃ−Ｄ（ｍ１）｝／｛ Ｄ（ｍ１＋１）−Ｄ（ｍ
１）｝ となる。同様に他方の座標値ｍをｍ２とするとその関数
は ｛Ｄｃ−Ｄ（ｍ２）｝／｛ Ｄ（ｍ２＋１）−Ｄ（ｍ
２）｝ となる。上記の各関数としきい値Ｄｃとの交点の座標値
はそれぞれ ｍ１＋[｛Ｄｃ−Ｄ（ｍ１）｝／｛ Ｄ（ｍ１＋１）−Ｄ
（ｍ１）｝] ｍ２＋[｛Ｄｃ−Ｄ（ｍ２）｝／｛ Ｄ（ｍ２＋１）−Ｄ
（ｍ２）｝] の演算を行うことによって求められるから、これら交点
２箇所の中点の座標位置ΔＸは ΔＸ＝[ｍ１＋ｍ２＋｛Ｄｃ−Ｄ（ｍ１）｝／｛ Ｄ（ｍ
１＋１）−Ｄ（ｍ１）｝ ＋｛Ｄｃ−Ｄ（ｍ２）｝／｛ Ｄ（ｍ２＋１）−Ｄ（ｍ
２）｝／２ の演算を行う。あらかじめ座標指示ペン５がＸ座標の原
点０に位置する場合のΔＸを求めておき、この値を定数
ΔＸ（０）として Ｘ＝ΔＸ−ΔＸ（０） の演算を行えば、電極ピッチを座標単位とする座標指示
ペン５のＸ位置座標を求めることができる。The threshold value Dc is obtained by setting Dc = Dn × 0.6. D (n) detected as a representative value in each predetermined period t
In the data from -2) to D (n-1), two data straddling this threshold value Dc are respectively represented by D
With (m) and D (m + 1), a coordinate value m that satisfies the condition of D (m) <Dc ≦ D (m + 1) or D (m)> Dc ≧ D (m + 1) is obtained. If the data from D (n−2) to D (n + 2) is normal data, there are two coordinate values m, which are m1 and m2. Assuming that one of the coordinate values m is m1, the data at the two coordinate values m1 and m1 + 1 that straddle the threshold value Dc are interpolated into D (m1) and D (m1 + 1) as function values, and the coordinate values m1 and m
The function connecting the two points 1 + 1 is {Dc-D (m1)} / ｛D (m1 + 1) -D (m
1) It becomes｝. Similarly, if the other coordinate value m is m2, the function is {Dc-D (m2)} / ｛D (m2 + 1) -D (m
2) It becomes｝. The coordinate value of the intersection of each of the above functions and the threshold value Dc is m1 + [{Dc-D (m1)} / ｛D (m1 + 1) -D
(M1)｝] m2 + [{Dc−D (m2)} / ｛D (m2 + 1) −D
(M2)｝], the coordinate position ΔX of the middle point of these two intersections is ΔX = [m1 + m2 + {Dc-D (m1)} / ｛D (m
1 + 1) −D (m1)｝ + {Dc−D (m2)} / ｛D (m2 + 1) −D (m
2) Perform the calculation of｝ / 2. If ΔX when the coordinate pointing pen 5 is located at the origin 0 of the X coordinate is determined in advance and this value is calculated as a constant ΔX (0), then X = ΔX−ΔX (0), the electrode pitch becomes a coordinate unit. The X position coordinates of the coordinate pointing pen 5 can be obtained.
【００１３】座標指示ペン５のＸ位置座標決定後、Ｙ電
極についても以上と同様の動作を行う。そしてＹ位置座
標の決定後、ホストピューターに位置座標データーを送
る。以上で１サイクル動作が終了する。以降、以上のサ
イクル動作を連続して行うことにより座標指示ペン５の
位置座標を逐次求めることが可能である。After the X position coordinates of the coordinate pointing pen 5 are determined, the same operation as above is performed for the Y electrode. Then, after the Y position coordinates are determined, the position coordinate data is sent to the host computer. Thus, one cycle operation is completed. Thereafter, the position coordinates of the coordinate pointing pen 5 can be sequentially obtained by continuously performing the above-described cycle operations.
【００１４】本実施例により、低価格である８ビットＣ
ＰＵ、８ビットＡ／Ｄコンバータ内臓の１チップマイコ
ンを使用したにもかかわらず分解能、精度がそれぞれ電
極ピッチの４％、２０％以下、１秒間に２００ポイント
以上の位置座標を読み取り可能な入力装置が実現でき
た。According to this embodiment, a low-cost 8-bit C
Input device that can read position coordinates of 4 points, 20% or less of the electrode pitch and 200 points or more per second with resolution and accuracy of 4% and 20% of the electrode pitch, respectively, even though a one-chip microcomputer with a built-in PU and 8-bit A / D converter is used. Was realized.
【００１５】［実施例２］実施例１において作業開始時
に使用者によって原点を座標指示ペンで指示してもら
い、その時得られるΔＸ、ΔＹをΔＸ（０）、ΔＹ
（０）とすることにより、使用者の視差の補正を簡単に
行うことができた。[Second Embodiment] In the first embodiment, at the start of work, a user designates the origin with a coordinate pointing pen, and ΔX and ΔY obtained at that time are represented by ΔX (0) and ΔY.
By setting (0), the parallax of the user could be easily corrected.
【００１６】［実施例３］実施例１においてタブレット
１として厚さ０．７ｍｍガラスの入力面にＸ電極、その
裏面にＹ電極をそれぞれ実施例１と同様の形状に形成、
Ｘ電極上にノングレアフィルムを貼ったものを用いたと
ころ、信号波形ＢのタイミングＣにおける電圧値の変化
のし方がＸ電極走査期間とＹ電極走査期間で大きく異な
ることが観察されたが実施例１と同様の演算を行うこと
により、同様の性能を得ることができ、かつ薄型化を図
ることができた。[Embodiment 3] In Embodiment 1, an X electrode is formed on the input surface of a 0.7 mm thick glass as the tablet 1 and a Y electrode is formed on the back surface thereof in the same shape as in Embodiment 1.
When a non-glare film was adhered on the X electrode, it was observed that the change in the voltage value at the timing C of the signal waveform B was significantly different between the X electrode scanning period and the Y electrode scanning period. By performing the same operation as in No. 1, the same performance can be obtained and the thickness can be reduced.
【００１７】［実施例４］実施例１、実施例３において
Ｄｃ＝Ｄｎ／２としたが、それぞれ同様の性能が得られ
た。[Embodiment 4] Dc = Dn / 2 in Embodiments 1 and 3, but the same performance was obtained.
【００１８】[0018]
【発明の効果】以上説明したように本発明の座標入力装
置によれば、低価格の汎用部品を使用して高分解能かつ
高精度で単位時間あたりの座標読み取り数の多い座標入
力装置の実現が可能となるという効果を有する。As described above, according to the coordinate input device of the present invention, it is possible to realize a coordinate input device having high resolution and high accuracy and having a large number of coordinate readings per unit time using low-cost general-purpose parts. This has the effect that it becomes possible.
【図１】本発明の実施例１における座標入力装置の構成
の説明図。FIG. 1 is an explanatory diagram of a configuration of a coordinate input device according to a first embodiment of the present invention.
【図２】本発明の実施例１における座標入力装置の動作
の説明図。FIG. 2 is an explanatory diagram of an operation of the coordinate input device according to the first embodiment of the present invention.
１．タブレット ２．駆動回路 ３．１チップマイコン ４．ＲＯＭ ５．座標指示ペン ６．ケーブル ７．波形整形増幅回路 ８．ホストコンピューター 1. Tablet 2. Drive circuit 3.1 Chip microcomputer 4. ROM5. 5. Coordinate pointing pen Cable 7. 7. Waveform shaping amplifier circuit Host computer
Claims (1)
極と略直交する方向に並行して配列された複数のＹ電極
および該Ｙ電極と前記Ｘ電極を絶縁する絶縁層からなる
タブレットと、前記Ｘ電極とＹ電極のそれぞれに所定の
信号を所定期間にわたって順次印加する電極駆動回路
と、前記タブレットに電極を近接、あるいは当接するこ
とにより得られた検出信号に基づき位置座標を出力する
位置検出手段とを備えた座標入力装置であって、 前記位置検出手段は、前記各所定期間における代表値と
して検出される前記検出信号に基ずき前記各所定期間に
おける前記代表値中の最大値によってしきい値を決定す
るとともに、該しきい値を跨ぐ前後２つの前記代表値を
もとに座標値における関数値として補間する関数に近似
し、該関数と前記しきい値との交点２箇所の座標値の中
点を算出することによって前記位置座標を出力すること
を特徴とする座標入力装置。1. A semiconductor device comprising: a plurality of X electrodes arranged in parallel; a plurality of Y electrodes arranged in parallel in a direction substantially orthogonal to the X electrodes; and an insulating layer insulating the Y electrodes and the X electrodes. A tablet, an electrode driving circuit for sequentially applying a predetermined signal to each of the X electrode and the Y electrode over a predetermined period, and outputting position coordinates based on a detection signal obtained by bringing the electrode close to or in contact with the tablet. A coordinate detecting device comprising: a position detecting unit that detects a maximum value of the representative value in each of the predetermined periods based on the detection signal detected as a representative value in each of the predetermined periods. A value is determined based on the threshold value, and a function that interpolates as a function value in coordinate values based on the two representative values before and after the threshold value is approximated. A coordinate input device for outputting the position coordinates by calculating a middle point of coordinate values at two intersections with the coordinate input device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9079092A JP3163731B2 (en) | 1992-04-10 | 1992-04-10 | Coordinate input device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9079092A JP3163731B2 (en) | 1992-04-10 | 1992-04-10 | Coordinate input device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05289806A JPH05289806A (en) | 1993-11-05 |
| JP3163731B2 true JP3163731B2 (en) | 2001-05-08 |
Family
ID=14008388
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9079092A Expired - Lifetime JP3163731B2 (en) | 1992-04-10 | 1992-04-10 | Coordinate input device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3163731B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4776832B2 (en) | 2000-10-19 | 2011-09-21 | キヤノン株式会社 | Coordinate input device and coordinate plate of image input device |
| JP3880888B2 (en) | 2002-06-18 | 2007-02-14 | Ｓｍｋ株式会社 | Tablet device |
| JP4424729B2 (en) | 2004-02-05 | 2010-03-03 | Ｓｍｋ株式会社 | Tablet device |
-
1992
- 1992-04-10 JP JP9079092A patent/JP3163731B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05289806A (en) | 1993-11-05 |
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