JP2009059006A - Coordinate input device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To accurately detect a touch point in a coordinate input device having two input areas. <P>SOLUTION: In a production method for this coordinate input device, a glass substrate formed with a face resistance body film on a coordinate input face is divided into two, an inter-face-resistance-body insulation-processed part for making the two-divided glass substrates non-electroconductive is provided, a resistive peripheral electrode is formed on each of the two-divided face resistance body films, and a reflection prevention film printed with lead wires each connecting a signal processing part and each vertex of the resistive peripheral electrodes is stuck onto the two-divided face resistance bodies. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、指又は座標指示器を使用することにより、２つの入力エリアで別々にタッチ位置を検出する座標入力パネルに関する。   The present invention relates to a coordinate input panel that detects a touch position separately in two input areas by using a finger or a coordinate indicator.

図１は静電容量結合方式の座標検出装置の例であり、座標入力パネルのガラス基材１の表面は、均一な面抵抗体膜２を取り囲む抵抗性周囲電極３が配設されており、抵抗性周囲電極３の頂点８から接続される引き出し線４が、信号処理部５に接続されている。
上記した従来の座標入力パネルは、ガラス基材１の表面に面抵抗体膜２としてスパッタ法によるＩＴＯ(インジウム酸化物)膜あるいは、ＣＶＤ法(化学的気相蒸着法)による酸化スズ膜等が約１ＫΩ／□で形成されている。さらに面抵抗体膜２の上には、抵抗性周囲電極３が隣り合った各頂点間の抵抗値が１００Ωになるように形成されている。
座標入力パネルの座標検出手段として、座標指示器(入力ペン、指、導電性物など)６から信号を発進し、静電容量結合(入力エリア７上にＤＣ５Ｖの電界を形成し、座標指示器などの容量結合により動作する)を介して面抵抗体膜２が、座標指示器６から発進された信号を受信する方法がある。
特願２００５−２８９１６３号 FIG. 1 shows an example of a capacitive detection type coordinate detection device, and a surface of a glass substrate 1 of a coordinate input panel is provided with a resistive surrounding electrode 3 surrounding a uniform sheet resistor film 2. A lead wire 4 connected from the apex 8 of the resistive surrounding electrode 3 is connected to the signal processing unit 5.
In the conventional coordinate input panel described above, an ITO (indium oxide) film formed by sputtering or a tin oxide film formed by CVD (chemical vapor deposition) is used as the surface resistor film 2 on the surface of the glass substrate 1. It is formed at about 1 KΩ / □. Further, on the surface resistor film 2, the resistive surrounding electrode 3 is formed so that the resistance value between adjacent apexes becomes 100Ω.
As a coordinate detection means of the coordinate input panel, a signal is started from a coordinate indicator (input pen, finger, conductive material, etc.) 6 to form a capacitive coupling (DC5V electric field on the input area 7). There is a method in which the sheet resistor film 2 receives a signal emitted from the coordinate indicator 6 via a capacitive coupling.
Japanese Patent Application No. 2005-289163

座標入力パネルにおいて、座標指示器６(入力ペンまたは指、導電物等)が近接または接触した点の位置を正確に検出するには、座標入力パネル上に生じる電位分布あるいは電流分布を均一にすることが必要となる。
そのために、面抵抗体膜２を均一に成膜すること、及び抵抗性周囲電極３の頂点８の
抵抗値が均一である事が必要である。同時に面抵抗体２のシート抵抗値(単位面積当たり
の抵抗で塗装膜、薄膜等が用いられる)が１０００Ω／□程度に対し、抵抗性周囲電極３の抵抗値が２０〜２００Ωであることが必要である。
座標入力パネルの面抵抗体２の成膜方法としては上記したように、スパッタ法やＣＶＤ法が用いられているが、抵抗性周囲電極３の形成方法として、導電性インクが知られている。このインクでは、導電性材料として、カーボン粉・銀粉等が使用され、所望の抵抗値になるようにその混合比を整合し使用される。これらのインクでは、スクリーン印刷された後、通常１５０℃〜８５０℃で加熱硬化される。
図１の座標入力パネルで入力エリア７（抵抗性周囲電極３に囲まれた面抵抗体膜２）に２つの座標指示器６を近接または接触させると接触位置が正確に検出する事が出来ない。（静電容量結合方式ではタッチセンサ上にＤＣ５Ｖの電界を形成し、２つ以上の座標指示器などで座標入力を行うと、最初の座標指示器の接触により電界が崩れてしまうので、容量結合により動作しない。）
次に、図２のように面抵抗体１０上に抵抗性周囲電極１１−aと抵抗性周囲電極１１−ｂを配設し、各抵抗性周囲電極に囲まれた１５−aと入力エリア１５−ｂの両方に座標指示器１４を近接または接触させると、入力エリア１５−aに座標指示器１４を接触させると、DC5Vの電界と座標指示器１４で容量結合による動作をする。入力エリア１５−ｂのDC5Vの電界は入力エリア１５−aと座標指示器１４との容量結合の影響を受けており、入力エリア１５−aに座標指示器１４を接触した状態で入力エリア１５−ｂに座標指示器１４を接触させると誤検出してしまい、接触箇所が正確に検出する事が出来ない。 In the coordinate input panel, in order to accurately detect the position of the point where the coordinate indicator 6 (input pen or finger, conductor, etc.) is close or in contact, the potential distribution or current distribution generated on the coordinate input panel is made uniform. It will be necessary.
Therefore, it is necessary that the surface resistor film 2 is uniformly formed and that the resistance value of the apex 8 of the resistive surrounding electrode 3 is uniform. At the same time, the resistance value of the resistive surrounding electrode 3 needs to be 20 to 200 Ω while the sheet resistance value of the surface resistor 2 (the resistance per unit area is a coating film, a thin film, etc.) is about 1000 Ω / □. It is.
As described above, the sputtering method or the CVD method is used as the film forming method of the surface resistor 2 of the coordinate input panel. As the method of forming the resistive surrounding electrode 3, conductive ink is known. In this ink, carbon powder, silver powder, or the like is used as the conductive material, and the mixing ratio is matched so as to obtain a desired resistance value. In these inks, after screen printing, they are usually heat-cured at 150 to 850 ° C.
When the two coordinate indicators 6 are brought close to or in contact with the input area 7 (the surface resistor film 2 surrounded by the resistive surrounding electrode 3) in the coordinate input panel of FIG. 1, the contact position cannot be accurately detected. . (In the capacitive coupling method, if a DC5V electric field is formed on the touch sensor and coordinates are input with two or more coordinate indicators, the electric field collapses due to the contact of the first coordinate indicator. Does not work.)
Next, as shown in FIG. 2, the resistive surrounding electrode 11-a and the resistive surrounding electrode 11-b are arranged on the surface resistor 10, and the input area 15 and 15-a surrounded by each resistive surrounding electrode. When the coordinate indicator 14 is brought close to or in contact with both -b, and the coordinate indicator 14 is brought into contact with the input area 15-a, the coordinate indicator 14 operates by capacitive coupling with the DC 5V electric field. The electric field of DC5V in the input area 15-b is affected by the capacitive coupling between the input area 15-a and the coordinate indicator 14, and the input area 15-a with the coordinate indicator 14 in contact with the input area 15-a. If the coordinate indicator 14 is brought into contact with b, it is erroneously detected, and the contact location cannot be detected accurately.

座標入力装置のガラス基板上に形成された面抵抗体膜の一部をエッチング除去して２つの面抵抗体膜を電気的に絶縁して形成すると共に、２つの抵抗性周囲電極及びそれぞれの抵抗性周囲電極の各頂点と信号処理部を接続する引出線を裏面に形成した反射防止フィルムを前記２分割した面抵抗体膜に貼付した座標入力装置を提案するものである。   A part of the surface resistor film formed on the glass substrate of the coordinate input device is removed by etching to electrically insulate the two surface resistor films, and the two resistive surrounding electrodes and their respective resistances are formed. The present invention proposes a coordinate input device in which an antireflection film in which a lead wire for connecting each vertex of a conductive surrounding electrode and a signal processing unit is formed on the back surface is attached to the two-piece surface resistor film.

面抵抗体膜の一部分をエッチング除去して左右の面抵抗体膜を電気的に絶縁することができるので、左右別々に入力作業が行えるようになった。   Since a part of the surface resistor film can be removed by etching to electrically insulate the left and right surface resistor films, input operations can be performed separately on the left and right sides.

本発明において座標入力パネルのガラス基材１７の表面に、均一な面抵抗体膜１８−ａ及び面抵抗体膜１８−ｂを形成する為、ＣＶＤ法等による酸化スズ膜が用いられる。   In the present invention, a tin oxide film formed by a CVD method or the like is used to form the uniform sheet resistor film 18-a and the sheet resistor film 18-b on the surface of the glass substrate 17 of the coordinate input panel.

形成される面抵抗体膜１８−ａおよび面抵抗体膜１８−ｂのシート抵抗値は、膜圧、形成時の温度、時間といった条件により定まり、所望の抵抗値を得るための条件は適宣選択されればよい。使用されるガラス基材も特にその材料を限定される物ではなく、無アルカリガラス、耐熱性硝子など任意の物が使用できるが、ＣＶＤ法による酸化スズ膜の形成温度が３００℃〜６００℃の範囲で形成されることから、耐熱温度が６００℃以下のソーダガラスも充分使用可能である。   The sheet resistance values of the formed surface resistor film 18-a and the surface resistor film 18-b are determined by conditions such as film pressure, temperature at the time of formation, and time, and the conditions for obtaining a desired resistance value are appropriate. It only has to be selected. The glass substrate used is not particularly limited in material, and any material such as non-alkali glass and heat-resistant glass can be used. However, the temperature of formation of the tin oxide film by the CVD method is 300 ° C. to 600 ° C. Since it is formed in a range, soda glass having a heat-resistant temperature of 600 ° C. or less can be sufficiently used.

抵抗性周囲電極は、前途のごとく導電性インクをスクリーン印刷法により、形成するのが好ましい。導電性インクには、樹脂をバインダーとし、１２０℃〜２００℃で有るため、工程が簡易であるという長所があり、加熱硬化する物が使われる。抵抗性周囲電極２０−ａと抵抗性周囲電極２０−ｂの印刷は、図４および図５に示されるようにＡＲフィルムのガラス基材１７側に印刷される。   The resistive surrounding electrode is preferably formed of a conductive ink by a screen printing method as before. Since the conductive ink uses a resin as a binder and has a temperature of 120 ° C. to 200 ° C., there is an advantage that the process is simple, and a material that is heat-cured is used. The resistive ambient electrode 20-a and the resistive ambient electrode 20-b are printed on the glass substrate 17 side of the AR film as shown in FIGS.

ＡＲフィルム１９のガラス基材１７側の面の印刷、乾燥した抵抗性周囲電極２０−ａと抵抗性周囲電極２０−ｂ上には導電性接着剤２５、抵抗性周囲電極２０−ａと抵抗性周囲電極２０−ｂ上以外には絶縁性接着剤２６を用いて、ガラス基材１７の面抵抗体膜１８−ａおよび面抵抗体膜１８−ｂ面に貼り合わせる。
導電性接着剤２５と絶縁性接着剤２６は任意のものが使用できる。 Printing on the surface of the AR film 19 on the side of the glass substrate 17 and the dried resistance surrounding electrode 20-a and the resistance surrounding electrode 20-b on the conductive adhesive 25, the resistance surrounding electrode 20-a and the resistance. Other than on the peripheral electrode 20-b, an insulating adhesive 26 is used to bond the glass substrate 17 to the surface resistor film 18-a and the surface resistor film 18-b.
Any conductive adhesive 25 and insulating adhesive 26 can be used.

以下本発明の実施例を図３、図４、図５を用いて説明する。
ソーダガラス（厚さ３ミリ）を略４３０×３３０ミリに切断したガラス基材１７を用意した。
表面を洗浄後、ＣＶＤ法により酸化スズ膜をシート抵抗値が１０００Ω／□になるように面抵抗体膜１８−ａおよび面抵抗体膜１８−ｂを形成した。
ＡＲフィルム１９（東レ社製ルミアＵ４２６）を４２０×３２０ミリに切断した。その後、ＡＲフィルム１９上に（株）アサヒ化学研究所製銀ペーストを用いて、スクリーン印刷により抵抗性周囲電極２０−ａと抵抗性周囲電極２０−ｂ及び引き出し線２１−ａと引き出し線２１−ｂを印刷した。その際に、抵抗性周囲電極の４頂点間抵抗値が約１００Ω、各頂点と引き出し線末端の抵抗値が５Ω以下になるようにパターン幅、長さが設計されたパターンを用いた。 Embodiments of the present invention will be described below with reference to FIGS. 3, 4, and 5. FIG.
A glass substrate 17 was prepared by cutting soda glass (thickness 3 mm) into approximately 430 × 330 mm.
After cleaning the surface, a sheet resistor film 18-a and a sheet resistor film 18-b were formed by a CVD method so that the sheet resistance value of the tin oxide film was 1000Ω / □.
The AR film 19 (Lumia U426 manufactured by Toray Industries, Inc.) was cut into 420 × 320 mm. Then, the resistive surrounding electrode 20-a, the resistive surrounding electrode 20-b, the lead wire 21-a, and the lead wire 21- are screen-printed on the AR film 19 using a silver paste manufactured by Asahi Chemical Research Co., Ltd. b was printed. At that time, a pattern in which the pattern width and length were designed so that the resistance value between the four apexes of the resistive surrounding electrode was about 100Ω and the resistance value between each apex and the lead wire end was 5Ω or less was used.

エッチング除去部２７で抵抗性周囲電極１１−ａと１１−ｂを非導通することにより、面抵抗体１０を２分割すれば、タッチセンサ上のＤＣ５Ｖ電界が分離され、座標検出をする事が可能になるが、エッチング除去部２７の表面処理や段差が目立ってしまうなどの欠点を有していた。
ＡＲフィルム１９の抵抗性周囲電極２０−ａと抵抗性周囲電極２０−ｂ上にスクリーン印刷で導電性接着剤（ＴＨＲＥＥＢＯＮＤ社製 ３３７３）２５を印刷した。ＡＲフィルム１９の抵抗性周囲電極２０−ａと抵抗性周囲電極２０−ｂ上以外にスクリーン印刷で絶縁性接着剤（ＴｈｒｅｅＢｏｎｄ社製１５３０ｃ）２６をスクリーン印刷した。ガラス基材１７とＡＲフィルム１９を接着し、乾燥後、ＡＲフィルム１９を信号処理部２４−ａと信号処理部２４−ｂに接続した。座標指示器１４−ａと信号指示器１４−ｂより座標検出をおこなった結果、精度が３％以内に収まり良好な性能を得られた。又、ＡＲフィルムを貼る前の透過率が８７％であったのに対し、ＡＲフィルムを貼った後の透過率は９１％と向上した。エッチングによる絶縁層２７は絶縁性接着剤２６をガラス基材１７とＡＲフィルム１９間に隙間なく入れる事により、段差がなくなった。また、ＡＲフィルム１９表面の凹凸をなくせ、目立たなくなった。 By making the resistive peripheral electrodes 11-a and 11-b non-conductive at the etching removal unit 27, if the surface resistor 10 is divided into two, the DC5V electric field on the touch sensor is separated, and coordinates can be detected. However, there are drawbacks such as the surface treatment of the etching removal portion 27 and the steps becoming conspicuous.
A conductive adhesive (3373 manufactured by THREEBOND) 25 was printed on the resistive surrounding electrode 20-a and the resistive surrounding electrode 20-b of the AR film 19 by screen printing. An insulating adhesive (1530c manufactured by ThreeBond) 26 was screen-printed by screen printing on the AR film 19 other than the resistive surrounding electrode 20-a and the resistive surrounding electrode 20-b. The glass substrate 17 and the AR film 19 were bonded, and after drying, the AR film 19 was connected to the signal processing unit 24-a and the signal processing unit 24-b. As a result of coordinate detection by the coordinate indicator 14-a and the signal indicator 14-b, the accuracy was within 3%, and good performance was obtained. Moreover, the transmittance before pasting the AR film was 87%, whereas the transmittance after pasting the AR film was improved to 91%. The insulating layer 27 formed by etching eliminated the step by inserting the insulating adhesive 26 between the glass substrate 17 and the AR film 19 without any gap. Moreover, the unevenness | corrugation on the surface of AR film 19 was eliminated and it became inconspicuous.

従来のタッチパネルの説明図Illustration of a conventional touch panel １枚のガラス基材上に２つの入力エリア有するタッチパネル 説明図Touch panel with two input areas on one glass substrate ２分割した面抵抗を有するガラス基材 説明図Glass base material with sheet resistance divided into two ＡＲフィルムに印刷した周囲電極・引き出し線 説明図Peripheral electrodes and lead lines printed on AR film 実施例の座標入力パネル断面図Example of coordinate input panel cross section

符号の説明Explanation of symbols

１ ガラス基材
２ 面抵抗体膜
３ 抵抗性周囲電極
４ 抵抗性周囲電極４の頂点からの引き出し線
５ 信号処理部
６ 座標指示器
７ 入力エリア
８ 抵抗性周囲電極３の頂点
９ ガラス基材
１０ 面抵抗体
１１ 抵抗性周囲電極
１２ 抵抗性周囲電極１１の頂点からの引き出し線
１３ 信号処理部
１４ 座標指示器
１５ 入力エリア
１６ 抵抗性周囲電極１１の頂点
１７ ガラス基材
１８ 面抵抗体
１９ ＡＲフィルム
２０ 抵抗性周囲電極
２１ 抵抗性周囲電極２０の頂点からの引き出し線
２２ 入力エリア
２３ 抵抗性周囲電極２０の頂点
２４ 信号処理部
２５ 導電性接着剤
２６ 絶縁性接着剤
２７ エッチングによる絶縁層 DESCRIPTION OF SYMBOLS 1 Glass base material 2 Surface resistor film | membrane 3 Resistive surrounding electrode 4 Lead line from the top of the resistive surrounding electrode 4 5 Signal processing part 6 Coordinate indicator 7 Input area 8 The top of the resistive surrounding electrode 3 9 Glass base material 10 Surface resistor 11 Resistive surrounding electrode 12 Lead wire from apex of resistive surrounding electrode 11 Signal processing unit 14 Coordinate indicator 15 Input area 16 Apex of resistive surrounding electrode 11 17 Glass substrate
DESCRIPTION OF SYMBOLS 18 Surface resistor 19 AR film 20 Resistive surrounding electrode 21 Lead wire from the top of resistive surrounding electrode 20 22 Input area 23 Apex of resistive surrounding electrode 20 24 Signal processing part 25 Conductive adhesive 26 Insulating adhesive 27 Insulating layer by etching

Claims (1)

座標入力装置のガラス基板上に形成された面抵抗体膜の一部をエッチング除去して２つの面抵抗体膜を電気的に絶縁して形成すると共に、２つの抵抗性周囲電極及びそれぞれの抵抗性周囲電極の各頂点と信号処理部を接続する引出線を裏面に形成した反射防止フィルムを前記２分割した面抵抗体膜に貼付したことを特徴とする座標入力装置。 A part of the surface resistor film formed on the glass substrate of the coordinate input device is removed by etching to electrically insulate the two surface resistor films, and the two resistive surrounding electrodes and their respective resistances are formed. A coordinate input device, characterized in that an antireflection film having a lead line connecting each apex of a conductive peripheral electrode and a signal processing unit formed on the back surface is attached to the two-piece surface resistor film.