Electrostatic capacitive touch sensor device
First Claim
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1. An electrostatic capacitive touch sensor device, comprising:
- a first sensing electrode having a first electrostatic capacitance value that changes depending on a touch operation by an operator;
a second sensing electrode having a second electrostatic capacitance value that changes depending on a touch operation by the operator;
a wave signal source that outputs a wave signal;
a wiring that connects the wave signal source to the first and second sensing electrodes to provide the wave signal to the first and second sensing electrodes;
a first impedance element provided in the wiring at a position between the first sensing electrode and the wave signal source;
a second impedance element provided in the wiring at a position between the second sensing electrode and the wave signal source;
a first shield element that shields the wiring between the first sensing electrode and the first impedance element;
a second shield element that shields the wiring between the second sensing electrode and the second impedance element;
a first detector circuit connected to the first sensing electrode and the wave source signal, and outputting a first output signal that changes in accordance with changes in the electrostatic capacitance value of the first sensing electrode;
a second detector circuit connected to the second sensing electrode and the wave source signal, and outputting a second output signal that changes in accordance with changes in the electrostatic capacitance value of the second sensing electrode; and
a shield signal source connected to the wave signal source and to the first and second shield elements, and applying a shield signal to the first and second shield elements, the shield signal having a same phase and an amplitude as the wave signal, the shield signal source being directly connected to the wire at a position between the wave signal source and the first and second detector circuits.
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Abstract
An electrostatic capacitive touch sensor device includes sensing electrode provided at a plurality of positions, a high-frequency signal source that applies a high-frequency signal to the sensing electrode through a predetermined impedance element, a wiring portion that connects the sensing electrode and the impedance element, a shield portion provided to embrace the sensing electrodes and the connecting pattern, and a shield signal source that applies a shield signal to the shield portion and has the same phase and amplitude as the high-frequency signal source.
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Citations
3 Claims
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1. An electrostatic capacitive touch sensor device, comprising:
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a first sensing electrode having a first electrostatic capacitance value that changes depending on a touch operation by an operator; a second sensing electrode having a second electrostatic capacitance value that changes depending on a touch operation by the operator; a wave signal source that outputs a wave signal; a wiring that connects the wave signal source to the first and second sensing electrodes to provide the wave signal to the first and second sensing electrodes; a first impedance element provided in the wiring at a position between the first sensing electrode and the wave signal source; a second impedance element provided in the wiring at a position between the second sensing electrode and the wave signal source; a first shield element that shields the wiring between the first sensing electrode and the first impedance element; a second shield element that shields the wiring between the second sensing electrode and the second impedance element; a first detector circuit connected to the first sensing electrode and the wave source signal, and outputting a first output signal that changes in accordance with changes in the electrostatic capacitance value of the first sensing electrode; a second detector circuit connected to the second sensing electrode and the wave source signal, and outputting a second output signal that changes in accordance with changes in the electrostatic capacitance value of the second sensing electrode; and a shield signal source connected to the wave signal source and to the first and second shield elements, and applying a shield signal to the first and second shield elements, the shield signal having a same phase and an amplitude as the wave signal, the shield signal source being directly connected to the wire at a position between the wave signal source and the first and second detector circuits. - View Dependent Claims (2, 3)
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Specification
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Current AssigneeMitsubishi Jidosha Kogyo Kabushiki Kaisha, Visteon Japan, Ltd. (Visteon Corporation)
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Original AssigneeMitsubishi Jidosha Kogyo Kabushiki Kaisha, Visteon Japan, Ltd. (Visteon Corporation)
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InventorsYamauchi, Kazuto, Murayama, Yasunori, Tanaka, Sadahiko, Takizawa, Keitaro, Yamanoue, Kouichi
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Primary Examiner(s)PIZIALI, JEFFREY J
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Application NumberUS12/878,462Publication NumberTime in Patent Office1,258 DaysField of Search345/174, 345/178, 178/18.06, 178/18.07, 178/18.08, 178/19.03, 178/20.01, 178/20.02, 178/20.03, 178/20.04US Class Current345/174CPC Class CodesH03K 17/962 Capacitive touch switchesH03K 2217/960755 Constructional details of c...
