JP2007207531A - Capacitance type touch switch device - Google Patents

Capacitance type touch switch device Download PDF

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JP2007207531A
JP2007207531A JP2006023829A JP2006023829A JP2007207531A JP 2007207531 A JP2007207531 A JP 2007207531A JP 2006023829 A JP2006023829 A JP 2006023829A JP 2006023829 A JP2006023829 A JP 2006023829A JP 2007207531 A JP2007207531 A JP 2007207531A
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switch
electrode
state
panel
capacitance
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JP4687478B2 (en
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Hiroshi Shinoda
宏 信田
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Pentel Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a capacitance type touch switch device of low power consumption type which can be driven by a battery, free from erroneous operation even if water is splashed on a panel. <P>SOLUTION: On a panel part made of an acrylic plate (polycarbonate or glass is also acceptable), a piezo-electrode having piezoelectric effect is mounted on a sheet formed by printing a switch electrode on a PET film. A control part is constituted of a piezo-electrode driving circuit capable of discriminating pressed state of the panel switch from non-pressed state thereof, a calculation circuit measuring changing amount of capacitance at contact state and non-contact state, and a CPU in which a nonvolatile memory storing the changing amount is built in. The capacitance type touch switch device of low power consumption, free from erroneous operation even if water is splashed on the panel, capable of bringing the calculation circuit and the CPU measuring the changing amount of capacitance into non-operational state until it becomes non-operation state by the result of calculation and pressing state, is provided. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、入力方式に静電容量方式を採用した静電容量型タッチスイッチに関するものである。   The present invention relates to a capacitive touch switch that employs a capacitive method as an input method.

図１に示した従来型の静電容量型タッチスイッチは、パネルスイッチと制御基板から構成される。パネルスイッチは、図２−1で示すＰＥＴフィルムに銀ペーストを印刷した電極シートをアクリルやガラス等からなる誘電体に接着剤（両面テープ等）で貼り付けたもので構成される。（図２−２）
図３−１で示すパネルスイッチに指（導通部材）が近づくと、誘電体を電極と指で挟んだ平行板コンデンサが形成され静電容量が増加する。また逆にパネルから指が離れると、この原理とは反対に静電容量が減少する。制御基板は、この静電容量の変化をＣ／Ｖ（容量を電圧）変換回路で電圧に変換し、ＣＰＵのＡＤＣ（Ａ／Ｄコンバータ）でデジタルデータに置き換え、演算プログラムよりスイッチのＯｎ／Ｏｆｆ状態を判断しているのが、静電容量型タッチスイッチの一般的な動作原理である。
しかし図３−２で示すようにパネルスイッチ表面に水がかかり水滴が出来ると、水も導通性があるため指が近づいた状態と同様に、静電容量の増加が発生し誤動作の原因となる。 The conventional capacitive touch switch shown in FIG. 1 includes a panel switch and a control board. The panel switch is configured by attaching an electrode sheet obtained by printing a silver paste on the PET film shown in FIG. 2-1 to a dielectric made of acrylic or glass with an adhesive (double-sided tape or the like). (Figure 2-2)
When a finger (conducting member) approaches the panel switch shown in FIG. 3A, a parallel plate capacitor in which a dielectric is sandwiched between the electrode and the finger is formed, and the capacitance increases. On the contrary, when the finger is removed from the panel, the capacitance decreases in contrast to this principle. The control board converts this change in capacitance into a voltage with a C / V (capacitance voltage) conversion circuit and replaces it with digital data with a CPU ADC (A / D converter). The general operating principle of the capacitive touch switch determines the state.
However, as shown in FIG. 3-2, when the surface of the panel switch is splashed with water and water droplets are formed, the water is also conductive, and as in the state where the finger is approached, the capacitance increases and causes malfunction. .

特許登録第２８８７３３６号。Patent registration No. 2887336.

従って従来の方式では、パネルスイッチの表面に水滴が付くと容量変化が発生し、指が触った状態と同程度の変化をした場合、誤動作が生じる。
その為パネルスイッチに水がかかり誤動作を防止する対策として、パネルスイッチ表面の水滴が素早く流れるように表面に傾斜を付け、更にパネル表面スイッチ部のみに凸局面を設け撥水処理を施しているのが現状である。しかしパネルスイッチ表面に傾斜を付けた場合、シャワーのような連続的に水がかかる場所では、水が捌けきれず容量変化が発生し誤動作を防止できない。また、パネルスイッチ表面に部分的に突起部を設けた場合にも、小さなスイッチには有効であるが、大きなスイッチでは水がかかり水滴が出来てしまい静電容量が変化して、誤動作を防止できない。その為、表面形状が限定され汎用性に乏しく使いにくいパネルスイッチとなってしまい、問題点を十分に解決するものではなかった。
また図1に示す従来の静電容量型タッチスイッチの動作は、静電容量の変化を測定するためにＣ／Ｖ変換回路を動作させ、その値をＣＰＵのＡＤＣによりデジタルデータに変換し、ＣＰＵの演算結果よりスイッチのＯｎ／Ｏｆｆを判断している。そのためにスイッチが押されない入力待ちの状態でも、制御基板が常時動作状態で消費電力を削減することが難しく、電池駆動の静電容量型タッチスイッチを商品化しにくい欠点があった。
そこで本発明は上記問題を解決することを目的とし、屋外や水回り等で使用した場合、水がかかり水滴が出来ても誤動作せず、また、スイッチの大きさや形状も限定しない静電容量型タッチスイッチを提供し、更にリモコンやＡＣ電源の取りにくいガスレンジ等のスイッチ部に搭載しても、電池駆動可能な低消費電力タイプの静電容量型タッチスイッチを提供する事にある。 Therefore, in the conventional method, when water droplets are applied to the surface of the panel switch, a change in capacity occurs, and a malfunction occurs when the change is similar to the state touched by a finger.
Therefore, as a measure to prevent water from splashing on the panel switch, the surface of the panel switch is inclined so that water droplets can flow quickly, and a convex surface is provided only on the panel surface switch to provide water repellent treatment. Is the current situation. However, when the surface of the panel switch is inclined, in places where water is continuously splashed, such as a shower, water cannot be burned and capacity changes occur, preventing malfunction. In addition, even if a projection is partially provided on the surface of the panel switch, it is effective for a small switch, but if a large switch is used, water splashes and water droplets are produced, resulting in a change in capacitance, which cannot prevent malfunction. . For this reason, the surface shape is limited and the panel switch is poor in versatility and difficult to use, and the problem cannot be solved sufficiently.
The operation of the conventional capacitive touch switch shown in FIG. 1 operates a C / V conversion circuit to measure a change in capacitance, converts the value into digital data by a CPU ADC, On / Off of the switch is determined from the result of the calculation. For this reason, even when the switch is not pressed, it is difficult to reduce power consumption when the control board is always in an operating state, and it is difficult to commercialize a battery-driven capacitive touch switch.
Therefore, the present invention aims to solve the above-mentioned problems, and when used outdoors or around water, it does not malfunction even if water drops and water drops are formed, and the capacitance type that does not limit the size and shape of the switch It is intended to provide a low power consumption type capacitive touch switch that can be driven by a battery even if it is mounted on a switch unit such as a remote control or a gas range where it is difficult to take an AC power supply.

上記課題を達成するために本発明では、静電容量型タッチスイッチにおいて、ＰＥＴフィルムに銀ペーストでスイッチ電極を印刷し、更に湾曲すると圧電効果による電圧が発生するピエゾ電極を搭載した電極シートを作成し、アクリル板又はガラス板（誘電体）に接着剤で貼り付けたパネルスイッチであり、前記パネルスイッチが対し指（導通部材）による、押し圧状態と無圧状態でピエゾ電極の電圧値を閾値とする回路及び、押し圧状態と無圧状態でスイッチ電極の静電容量変化量を計測する演算回路で、電圧値及び静電容量両方の変化量を記憶する不揮発性メモリを搭載した制御基板からなる静電容量型タッチスイッチ装置を提案するものである。   In order to achieve the above object, in the present invention, in a capacitive touch switch, a switch electrode is printed with a silver paste on a PET film, and an electrode sheet on which a piezoelectric electrode is generated that generates a voltage due to the piezoelectric effect when further curved is created. The panel switch is bonded to an acrylic plate or glass plate (dielectric) with an adhesive, and the panel switch is set to a threshold value of the voltage value of the piezo electrode in a pressed state and a non-pressed state by a finger (conducting member). From a control board equipped with a non-volatile memory that stores the amount of change in both the voltage value and the capacitance. An electrostatic capacitance type touch switch device is proposed.

本発明によれば静電容量型タッチスイッチの水滴による誤動作防止対策に於いて、パネルスイッチに傾斜を付けたり、また、スイッチ表面に凸曲面を設け撥水処理することなく、簡単なパネル構造で、パネルスイッチに水がかかり水滴が出来ても誤動作しない静電容量型タッチスイッチが提供できる。
また消費電力においても、パネルスイッチが指で押され湾曲するまで入力待ち状態で、圧電素子駆動回路のみ動作し、ＣＰＵや静電容量変化の回路が動作する必要がなく、消費電力が削減でき電池駆動可能な静電容量型タッチスイッチが提供できる。 According to the present invention, in order to prevent malfunction due to water droplets of a capacitive touch switch, the panel switch has a simple panel structure without being inclined or having a convex curved surface on the surface of the switch for water repellent treatment. In addition, it is possible to provide a capacitive touch switch that does not malfunction even when water is applied to the panel switch.
In terms of power consumption, only the piezoelectric element drive circuit operates while waiting for input until the panel switch is pushed by the finger and bends, and the CPU and the capacitance change circuit do not need to operate. A drivable capacitive touch switch can be provided.

本発明は、図５で示す通りパネルスイッチと制御基板から構成する。
パネルスイッチは、ＰＥＴフィルムにスイッチ電極とＧＮＤ電極を印刷したフィルムに圧電素子を両面テープ等で貼り付けた電極シートで（図４−１）、前記電極シートをガラス板またはアクリル板（誘電体）に、接着剤で貼り付け構造となる。
本発明で採用する接着剤としては、両面テープやのり、ボンド等の接着効果のあるものであれば良いものである。
スイッチ電極は、人の指が隠れるくらいの大きさでＰＥＴフィルムに銀ペーストで印刷し、指（導通部材）と電極の間で静電容量変化が発生する。
ＧＮＤ電極は、パネル周辺に銀電極でパターンを這わし、ノイズ低減と信号レベルの安定化をはかる事を目的としている。
圧電素子には、湾曲しやすく貼り付けやすいピエゾフィルムを使用する。ピエゾフィルムは、伸縮すると圧電効果により電圧が発生する性質があり、スイッチ電極の上部または下部に長方形のピエゾフィルムを平行に貼り付け、ピエゾ電極を形成する。このピエゾ電極つき電極シートをパネルスイッチの裏面に両面テープで貼り付ける。パネルスイッチを指で押す圧力でピエゾ電極が伸縮され電圧が発生する。このピエゾ電極は、圧電効果の性質により、パネルスイッチが湾曲する割合に応じて正比例して電圧が発生する
制御基板は、ピエゾ電極で発生した電圧が予め設定した閾値を越えた場合、ＣＰＵに対しインターラプト（ＩＮＴ）信号を発生するピエゾ駆動回路、スイッチ電極を順番にて発振回路に接続するためのスイッチ電極切り換え回路、発振回路を利用した容量変化を周波数変化に変換するＣ／Ｆ変換回路、Ｃ／Ｆ変換回路の動作非動作を選択するためのＣＰＵのＩ／Ｏ制御信号、閾値データを記憶するための不揮発性メモリ、波形の幅が計測できるインプットキャプチャ機能が内蔵されたＣＰＵで構成する。 The present invention comprises a panel switch and a control board as shown in FIG.
A panel switch is an electrode sheet in which a switch element and a GND electrode are printed on a PET film, and a piezoelectric element is attached to the film with a double-sided tape or the like (FIG. 4-1). The electrode sheet is a glass plate or an acrylic plate (dielectric). Moreover, it becomes a pasting structure with an adhesive.
As the adhesive employed in the present invention, any adhesive having a bonding effect such as a double-sided tape, glue, or bond may be used.
The switch electrode is printed with a silver paste on a PET film so as to hide a human finger, and a capacitance change occurs between the finger (conducting member) and the electrode.
The purpose of the GND electrode is to reduce the noise and stabilize the signal level by patterning a silver electrode around the panel.
For the piezoelectric element, a piezo film that is easily bent and attached is used. A piezo film has a property of generating a voltage due to a piezoelectric effect when it expands and contracts, and a rectangular piezo film is attached in parallel to the upper or lower portion of a switch electrode to form a piezo electrode. This electrode sheet with piezo electrodes is attached to the back of the panel switch with double-sided tape. Piezo electrodes are expanded and contracted by the pressure of pressing a panel switch with a finger, generating a voltage. Due to the nature of the piezoelectric effect, this piezo electrode generates a voltage that is directly proportional to the rate at which the panel switch bends. The control board is connected to the CPU when the voltage generated at the piezo electrode exceeds a preset threshold. Piezo drive circuit for generating an interrupt (INT) signal, switch electrode switching circuit for sequentially connecting switch electrodes to the oscillation circuit, C / F conversion circuit for converting capacitance change using the oscillation circuit to frequency change, CPU I / O control signal for selecting operation / non-operation of C / F conversion circuit, non-volatile memory for storing threshold data, and CPU with built-in input capture function capable of measuring waveform width .

以下本発明を具体化した実施例について図面を参照して説明する。まず始めにパネルスイッチの無圧状態と、押し圧状態を判断する方法について図６に基づいて説明する。ピエゾ電極の一端をＧＮＤに接続し反対側のもう一端をＣ-ＭＯＳ型ＯＰアンプの＋端子に接続する。Ｒ1はピエゾ電極の電圧発生用抵抗で１００ＭΩの高抵抗が必要で、発生電圧を増幅するため低消費電力タイプのＣ-ＭＯＳ型ＯＰアンプを非反転増幅回路として使用する。増幅率は非反転増幅回路のため（Ｒ３／Ｒ２）＋１でパネルスイッチがどれくらい湾曲すればスイッチが押されたかを判定する閾値の値なる。
図６−１のパネルスイッチが無圧状態の時は、ピエゾ電極の出力電圧が０ＶのためＯＰアンプの出力も０ＶでＬｏｗレベル信号となり、汎用ＩＣの７４ＨＣ１４反転回路よりＩＮＴ信号はＨｉｇｈレベルとなり、パネルスイッチが無圧状態であることを通知し、ＣＰＵを起動状態にしない。
図６-２のパネルスイッチが押し圧状態の時はピエゾ電極から電圧が発生し、増幅回路にて（Ｒ３／Ｒ２）＋１倍に増幅される。予め決められた閾値を超えた電圧が発生するまでパネルスイッチが湾曲すると、７４ＨＣ１４反転回路よりＩＮＴ信号はＬｏｗレベルとなりパネルスイッチが押し圧状態であることを通知しＣＰＵを起動状態にする。 Embodiments of the present invention will be described below with reference to the drawings. First, a method for determining the non-pressure state and the pressing state of the panel switch will be described with reference to FIG. One end of the piezo electrode is connected to GND, and the other end on the opposite side is connected to the + terminal of the C-MOS type OP amplifier. R1 is a resistance for generating a voltage of a piezoelectric electrode and requires a high resistance of 100 MΩ, and a low power consumption type C-MOS type OP amplifier is used as a non-inverting amplifier circuit in order to amplify the generated voltage. Since the amplification factor is a non-inverting amplifier circuit, it is (R3 / R2) +1 and becomes a threshold value for determining how much the panel switch is bent and how much the switch is pressed.
When the panel switch in FIG. 6A is in a non-pressure state, the output voltage of the piezo electrode is 0V, so the output of the OP amplifier is also 0V and becomes a low level signal. Notifies that the panel switch is in the no-pressure state and does not activate the CPU.
When the panel switch in FIG. 6B is in the pressed state, a voltage is generated from the piezo electrode and is amplified by (R3 / R2) +1 times by the amplifier circuit. When the panel switch is bent until a voltage exceeding a predetermined threshold is generated, the INT signal becomes low level from the 74HC14 inversion circuit to notify that the panel switch is in the pressing state and activate the CPU.

次に、パネルスイッチに指が接触状態と非接触状態時でスイッチ電極の静電容量変化量を計測する方式を図７に基づいて説明する。
パネルスイッチに指が触れない非接触状態即ちスイッチＯＦＦの状態で、ＣＰＵのＩ／Ｏ端子２より電極切り換え回路に対し制御信号を出力し、Ｃ／Ｆ変換回路にＳＷ１〜ＳＷ６まで順番に接続し、その時の発振周波数を測定し、各スイッチＯＦＦ状態の発信周波数Ｔｏｆｆ−１〜Ｔｏｆｆ−６の値をＣＰＵのＩ／Ｏ端子１に接続された不揮発性メモリに記憶する。
次にパネルスイッチに指が触れた接触状態、即ちスイッチＯＮの状態で、ＣＰＵのＩ／Ｏ端子２より電極切り換え回路に対し制御信号を出力し、Ｃ／Ｆ変換回路にＳＷ１〜ＳＷ６の順番に接続しその時の発振周波数を測定し、各スイッチＯＮ状態の発信周波数（図8）Ｔｏｎ−１〜Ｔｏｎ−６をＣＰＵのＩ／Ｏ端子１に接続された不揮発性メモリに記憶する。 Next, a method of measuring the amount of change in the capacitance of the switch electrode when the finger is in contact with or not in contact with the panel switch will be described with reference to FIG.
In a non-contact state where the finger does not touch the panel switch, that is, in the switch OFF state, a control signal is output from the CPU I / O terminal 2 to the electrode switching circuit, and SW1 to SW6 are sequentially connected to the C / F conversion circuit. Then, the oscillation frequency at that time is measured, and the values of the transmission frequencies Toff-1 to Toff-6 in each switch OFF state are stored in a nonvolatile memory connected to the I / O terminal 1 of the CPU.
Next, in the contact state where the finger touches the panel switch, that is, the switch is ON, a control signal is output from the I / O terminal 2 of the CPU to the electrode switching circuit, and SW1 to SW6 are sequentially supplied to the C / F conversion circuit. The oscillation frequency at the time of connection is measured, and the transmission frequencies (FIG. 8) Ton-1 to Ton-6 in each switch ON state are stored in a non-volatile memory connected to the I / O terminal 1 of the CPU.

上記測定した電極パネルの個々の初期データは、ＣＰＵの不揮発性メモリに内蔵されており下記の通りである。
１）スイッチＯＦＦ状態の発振周波数（図9−1）
・容量 Ｃ＝Ｃ１
・抵抗値 Ｒ＝Ｒ１
・周波数 Ｔｏｆｆ−１，２，３，４，５，６＝１００ｋＨｚ程度
２）スイッチＯＮ状態の発振周波数（図9−2）
・容量 Ｃ＝Ｃ１＋Ｃ２（指が触ったことによる容量増加）
・抵抗値 Ｒ＝Ｒ１
・周波数 Ｔｏｎ−１，２，３，４，５，６＝９９ｋＨｚ程度
一例としてＳＷ２が押された場合について、判断方法を図１０の具体的な回路を使い説明する。
ＳＷ２が押された押し圧状態になると、ピエゾ電極が湾曲しＯＰアンプの出力値が閾値を超え、７４ＨＣ１４の反転回路からＣＰＵに対しＩＮＴ信号を発生する。ＣＰＵのＩＮＴ端子にＬｏｗレベルの信号が入るとスタンバイモードで停止していたＣＰＵに起動がかかり、予め内蔵されていたプログラムに従いＣＰＵのＩ／Ｏ端子3にて発信回路の停止信号を解除し、ＴＬＣ５５５は発振用タイマーＩＣとしてマルチバイブレータ回路が構成される。
次にＣＰＵのＩ／Ｏ端子２より電極切り換え回路に対し制御信号を出力し、Ｃ／Ｆ変換回路にＳＷ１〜ＳＷ６の順番に接続しその時の発振周波数を測定する。ＳＷ１＝ＳＷ３＝ＳＷ４＝ＳＷ５＝ＳＷ６＝１００ｋＨｚでＴｏｆｆと同じ周波数のためスイッチＯＦＦと判断できる。ＳＷ２は、９９ｋＨｚでＴｏｎと同じで周波数のためスイッチＯＮと判断できる。 Individual initial data of the measured electrode panel is incorporated in the nonvolatile memory of the CPU and is as follows.
1) Oscillation frequency when switch is OFF (Figure 9-1)
・ Capacity C = C1
・ Resistance value R = R1
・ Frequency Toff-1, 2, 3, 4, 5, 6 = about 100kHz 2) Oscillation frequency when switch is on (Figure 9-2)
・ Capacity C = C1 + C2 (Capacity increase due to finger touch)
・ Resistance value R = R1
-Frequency Ton-1,2,3,4,5,6 = 99 kHz As an example, the determination method will be described using the specific circuit of FIG. 10 when SW2 is pressed.
When SW2 is pressed, the piezo electrode is bent, the output value of the OP amplifier exceeds the threshold value, and an INT signal is generated from the inverting circuit of 74HC14 to the CPU. When a low level signal is input to the INT terminal of the CPU, the CPU that has been stopped in the standby mode is activated, and the stop signal of the transmitting circuit is canceled at the I / O terminal 3 of the CPU according to the program built in advance. The TLC 555 includes a multivibrator circuit as an oscillation timer IC.
Next, a control signal is output from the I / O terminal 2 of the CPU to the electrode switching circuit, connected to the C / F conversion circuit in the order of SW1 to SW6, and the oscillation frequency at that time is measured. Since SW1 = SW3 = SW4 = SW5 = SW6 = 100 kHz and the same frequency as Toff, it can be determined that the switch is OFF. SW2 is the same as Ton at 99 kHz and can be determined to be a switch ON because of the frequency.

この原理により、パネルスイッチに水がかかり水滴ができても、パネルが湾曲しないためピエゾ電極から電圧が発生せず、静電容量変換回路（Ｃ/Ｆ変換回路）が非動作のため静電容量型タッチスイッチは誤動作防止可能となる。
更にパネルスイッチが無圧状態つまりスイッチが入力状態では、ＣＰＵをスタンバイモードにし発信回路も停止状態にできるため低消費電力モードが実現でき電池駆動も可能となる。 Due to this principle, even if water is applied to the panel switch and water droplets are formed, the panel does not bend, so no voltage is generated from the piezo electrode, and the capacitance conversion circuit (C / F conversion circuit) is inactive, so the capacitance The type touch switch can prevent malfunction.
Further, when the panel switch is in the non-pressure state, that is, the switch is in the input state, the CPU can be set in the standby mode and the transmission circuit can be stopped, so that the low power consumption mode can be realized and the battery can be driven.

静電容量型タッチスイッチの構造図。FIG. 3 is a structural diagram of a capacitive touch switch. パネル構造図。Panel structure diagram. 静電容量変化メカニズム。Capacitance change mechanism. ピエゾ電極付きパネルスイッチ。Panel switch with piezo electrode. ピエゾ電極付き静電容量型タッチスイッチのシステム構成図。The system block diagram of the electrostatic capacitance type touch switch with a piezo electrode. ピエゾ電極駆動回路。Piezo electrode drive circuit. スイッチ電極静電容量変化量測定回路構成図。Switch electrode capacitance variation measuring circuit configuration diagram. 指が接触状態の静電容量変化測定回路（Ｃ／Ｆ変換回路）。Capacitance change measurement circuit (C / F conversion circuit) with finger in contact. 容量変化による発振周波数の変化。Change in oscillation frequency due to capacitance change. 静電容量型タッチスイッチの構成図。The block diagram of an electrostatic capacitance type touch switch.

符号の説明Explanation of symbols

１ 発信回路
２ ＣＰＵ
３ Ｉ／Ｏ端子
４ 電極切り替え回路 1 Transmission circuit
2 CPU
3 I / O terminal 4 Electrode switching circuit

Claims (2)

静電容量型タッチスイッチにおいて、ＰＥＴフィルムに銀ペーストでスイッチ電極を印刷し、更に湾曲すると圧電効果による電圧が発生するピエゾ電極を搭載した電極シートを作成し、アクリル板又はガラス板（誘電体）に接着剤で貼り付けたパネルスイッチであり、前記パネルスイッチが対し指（導通部材）による、押し圧状態と無圧状態でピエゾ電極の電圧値を閾値とする回路及び、押し圧状態と無圧状態でスイッチ電極の静電容量変化量を計測する演算回路で、電圧値及び静電容量両方の変化量を記憶する不揮発性メモリを搭載した制御基板からなることを特徴とする静電容量型タッチスイッチ装置。 In capacitive touch switches, a switch electrode is printed with silver paste on a PET film, and an electrode sheet on which a piezoelectric electrode is generated that generates a voltage due to the piezoelectric effect when it is further curved, is an acrylic plate or glass plate (dielectric) A panel switch pasted with an adhesive to the panel switch, with a finger (conducting member) against which the voltage value of the piezo electrode is set as a threshold value in a pressed state and a non-pressed state, and a pressure state and no pressure Capacitive touch characterized by comprising a control board equipped with a non-volatile memory that stores the amount of change in both voltage value and capacitance in an arithmetic circuit that measures the amount of change in capacitance of the switch electrode in a state Switch device. 静電容量型タッチスイッチは、パネルスイッチが無圧状態のスイッチ入力待ち状態で静電容量変化を計測する演算回路を非動作とし、押し圧状態でピエゾ電極の電圧値が閾値を超える状態でＣＰＵを起動し、消費電力を削減できることを特徴とする請求項１記載の静電容量型タッチスイッチ装置。
The capacitive touch switch is a CPU that does not operate an arithmetic circuit that measures a change in capacitance while the panel switch is in a no pressure state waiting for a switch input, and in a state where the voltage value of the piezo electrode exceeds a threshold value in a pressed state. The capacitive touch switch device according to claim 1, wherein power consumption can be reduced.
JP2006023829A 2006-01-31 2006-01-31 Capacitive touch switch device Expired - Fee Related JP4687478B2 (en)

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