JP2017204059A - Input device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an input device capable of improving determination accuracy for operation from an operation body.SOLUTION: An input device includes: an electrode that is connected to a sensor line, and to which a drive signal is applied; a parallel line arranged parallely with the sensor line; a detection unit configured to detect an electrostatic capacitance of the electrode; and a processing unit configured to determine operation to the electrode, based on change of the detected electrostatic capacitance. The processing unit is configured to perform first control of applying a signal having the same waveform as the drive signal to the parallel line, or second control of preventing the signal having the same waveform as the drive signal from being applied to the parallel line, and when it is determined that the operation to the electrode is performed, to correct variation of the electrostatic capacitance due to operation other than an operation body, and to determine the operation to the electrode.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an input device.

  A technique related to a capacitance-type input device that can improve detection accuracy by reducing the influence of parasitic capacitance has been developed. As a technique related to the touch panel for improving the detection accuracy by suppressing the influence of the parasitic capacitance of the detection circuit and the detection wiring, for example, a technique described in Patent Document 1 is cited.

JP 2011-138316 A

  The capacitance type input device detects, for example, the capacitance of an electrode corresponding to an electrostatic sensor (electrostatic switch), and detects a change in the capacitance of the electrode caused by an operation with an operating body such as a finger. Thus, it is determined whether or not an operation is performed on the electrostatic sensor corresponding to the electrode. The change in the capacitance of the electrode is detected, for example, by comparing the detected capacitance of the electrode with a predetermined threshold value.

  In an electrostatic capacitance type input device, the detected capacitance of the electrode increases due to factors other than the operating body such as temperature change and humidity change after the operation to the electrostatic sensor corresponding to a certain electrode is detected. There is a case. When the capacitance increases due to factors other than the operating body as described above, for example, “the operation is performed on the electrostatic sensor corresponding to the electrode even though the operation using the operating body is not performed. There is a risk of erroneous determination in the input device.

  Here, for example, in an electrostatic capacitance type input device in which the technique described in Patent Document 1 is used, parasitic capacitance correction data for correcting parasitic capacitance associated with a pair of adjacent wires is calculated. Then, in the input device using the technique described in Patent Document 1, when an operation of the operating body on the touch screen is detected, the parasitic capacitance associated with a pair of adjacent wires based on the parasitic capacitance correction data. Is corrected. Therefore, for example, when the technique disclosed in Patent Document 1 is used, it is possible to reduce the influence of parasitic capacitance associated with a pair of adjacent wirings.

  However, for example, the technique described in Patent Document 1 corrects the parasitic capacitance of a pair of adjacent wires. Therefore, for example, when the parasitic capacitance of a pair of adjacent wirings is sufficiently small, for example, when the distance between the wirings is sufficiently large, even if the technique described in Patent Document 1 is used, for example, the erroneous determination described above is performed. Can occur.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a new and improved input device capable of improving the accuracy of determination of an operation by an operating tool. There is.

  In order to achieve the above object, according to one aspect of the present invention, an electrode connected to a sensor line and to which a drive signal is applied, a parallel line arranged to run parallel to the sensor line, A detection unit that detects a capacitance of the electrode; and a processing unit that determines an operation on the electrode based on the detected change in the capacitance. The first control for applying a signal having the same waveform as the drive signal or the second control for not applying a signal having the same waveform as the drive signal to the parallel line is performed, and it is determined that an operation has been performed on the electrode. In such a case, an input device is provided that determines an operation on the electrode by correcting the change in the capacitance due to other than the operating body.

  With this configuration, when it is determined that an operation has been performed on the electrode, it is determined whether or not the operation has been performed by taking into account fluctuations in capacitance due to factors other than the operating body such as temperature changes and humidity changes. It becomes possible to do. Therefore, with this configuration, it is possible to improve the determination accuracy of the operation by the operating tool.

  The processing unit performs the first control when it is not determined that the operation for the electrode has been performed, and performs the first control when it is determined that the operation for the electrode is performed. The correction value for correcting the change in the electrostatic capacitance other than the operating body is calculated by switching between the control and the second control, and the change in the electrostatic capacitance other than the operating body is calculated based on the calculated correction value. Minutes may be corrected.

  The processing unit corrects the correction based on the capacitance detected when the first control is performed and the capacitance detected when the second control is performed. A value may be calculated.

  Further, the processing unit calculates a capacitance variation ratio of the capacitance in a predetermined period based on the capacitance detected when the second control is performed, and the first control is performed. In the case where it is performed, the correction value may be calculated by multiplying the capacitance when the operation on the electrode is not performed by the capacitance variation ratio.

  In addition, the processing unit compares the detected capacitance with a determination threshold value set for the electrode, determines an operation on the electrode, and determines that an operation on the electrode has been performed. In such a case, the determination threshold value may be corrected by the change in the electrostatic capacitance other than the operating body.

  In addition, the processing unit compares the detected capacitance with a determination threshold value set for the electrode, determines an operation on the electrode, and determines that an operation on the electrode has been performed. In this case, the detected capacitance may be corrected by the change in the capacitance other than by the operating body.

  In addition, after it is determined that the operation on the electrode has been performed, if it is not determined that the operation on the electrode has been performed, the processing unit performs the first control to perform the operation on the electrode. You may judge.

  According to the present invention, it is possible to improve the determination accuracy of the operation by the operating tool.

It is explanatory drawing for demonstrating an example of the determination of operation in case the electrostatic capacitance of an electrode does not increase by factors other than an operation body. It is explanatory drawing for demonstrating an example of the determination of operation when the electrostatic capacitance of an electrode increases by factors other than an operation body. It is explanatory drawing for demonstrating the method for suppressing the parasitic capacitance of the electrode which concerns on embodiment of this invention. It is a block diagram which shows an example of a structure of the input device which concerns on embodiment of this invention. It is explanatory drawing for demonstrating an example of "judgment of operation with respect to the electrode E after correct | amending the variation | change_quantity of the electrostatic capacitance of the electrode E other than an operation body" concerning embodiment of this invention.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the present specification and drawings, components having substantially the same functional configuration are denoted by the same reference numerals, and redundant description is omitted.

[1] Outline of processing in input device according to embodiment of the present invention (outline of processing according to determination method according to embodiment of the present invention)
As described above, in a capacitance-type input device (hereinafter simply referred to as “input device”), for example, a change in capacitance of an electrode caused by an operation with an operating body such as a finger is detected. It is determined whether or not an operation is performed on the electrostatic sensor corresponding to the electrode. In addition, as described above, when the capacitance of the electrode increases due to factors other than the operating body such as temperature change and humidity change, an erroneous determination is made in the input device due to the increase in capacitance due to factors other than the operating body. May occur.

  FIG. 1 is an explanatory diagram for explaining an example of operation determination in a case where the capacitance of the electrode does not increase due to factors other than the operating body. FIG. 2 is an explanatory diagram for explaining an example of operation determination when the capacitance of the electrode increases due to factors other than the operating body.

  “Cp” shown in FIG. 1 and FIG. 2 indicates the parasitic capacitance of the electrode, and “Cf” shown in FIG. 1 and FIG. 2 indicates the amount of increase in capacitance that is increased by the operation by the operating body. . Further, “Ct” shown in FIG. 2 indicates the amount of increase in capacitance that increases due to factors other than the operating body such as temperature change and humidity change.

  The “determination threshold” shown in FIGS. 1 and 2 is a threshold for determining whether or not an operation has been performed.

  In addition, “ON” shown in FIGS. 1 and 2 indicates a state in which it is determined that an operation has been performed on the electrostatic sensor corresponding to the electrode, and “OFF” shown in FIGS. A state in which it is not determined that an operation has been performed on the corresponding electrostatic sensor is shown.

  First, the case where the capacitance of the electrode does not increase due to factors other than the operating body will be described with reference to FIG.

  When an operation using an operating tool is performed on an electrostatic sensor corresponding to a certain electrode, the capacitance of the detected electrode is increased by the operation using the operating tool (from “Cp” to “Cp + Cf” shown in FIG. 1). increase of.). The input device detects an electrostatic sensor corresponding to the electrode when the capacitance of the detected electrode is equal to or greater than the determination threshold (or when the capacitance of the detected electrode is greater than the determination threshold). It is determined that the operation has been performed.

  Further, when the operation with the operating body is not performed on the electrostatic sensor, the operation with the operating body is not performed, whereby the capacitance of the detected electrode decreases (from “Cp + Cf” shown in FIG. 1). Decrease to “Cp”). The input device detects an electrostatic sensor corresponding to the electrode when the capacitance of the detected electrode is smaller than the determination threshold (or when the capacitance of the detected electrode is equal to or lower than the determination threshold). It is determined that the operation is no longer performed.

  For example, as shown in FIG. 1, in the input device, by detecting a change in the capacitance of the electrode caused by the operation by the operating body by threshold processing using the determination threshold, the input device detects the change in the electrostatic capacitance corresponding to the electrode. It is determined whether an operation is being performed.

  Next, a case where the capacitance of the electrode increases due to factors other than the operating body will be described with reference to FIG.

  When an operation using an operating tool is performed on an electrostatic sensor corresponding to a certain electrode, the capacitance of the detected electrode is increased by the operation using the operating tool, as in the example shown in FIG. 1 (see FIG. 2). Increase from “Cp” to “Cp + Cf”.) The input device detects an electrostatic sensor corresponding to the electrode when the capacitance of the detected electrode is equal to or greater than the determination threshold (or when the capacitance of the detected electrode is greater than the determination threshold). It is determined that the operation has been performed.

  Here, for example, when the electrostatic capacitance of the electrode increases due to a factor other than the operating body due to a temperature change caused by the heat of the operating body, the detected electrostatic capacity of the electrode further increases (FIG. (Increase from “Cp + Cf” to “Cp + Cf + Ct” shown in FIG. 2).

  Further, when the operation with the operating body is not performed on the electrostatic sensor, the operation with the operating body is not performed, so that the capacitance of the detected electrode decreases (from “Cp + Cf + Ct” shown in FIG. 2). Decrease to “Cp + Ct”).

  As shown in FIG. 2, when the capacitance (“Cp + Ct” shown in FIG. 2) after reduction after the operation by the operating body is larger than the determination threshold, the input device performs the operation by the operating body. It is determined that the operation is being performed on the electrostatic sensor corresponding to the electrode even though the operation is not performed. Therefore, as shown in FIG. 2, when the capacitance of the electrode increases due to factors other than the operating body such as a temperature change, an erroneous determination is made in the input device due to the increase in capacitance due to a factor other than the operating body. May occur.

  Here, for example, an increase in the capacitance of the electrode detected after the operation is determined to be performed, such as an increase from “Cp + Cf” to “Cp + Cf + Ct” shown in FIG. It is difficult to determine whether it is caused by an operating body such as the area of the object or by a factor other than the operating body.

  Further, the characteristics relating to the increase in the capacitance of the electrode due to factors other than the operating body such as a temperature change caused by the heat etc. of the operating body include, for example, the parasitic capacitance of the electrode (the sensor connected to the electrode) The parasitic capacitance of the line can also be included.) And so on. Therefore, it is difficult to uniquely specify the characteristics relating to the increase in the capacitance of the electrode due to factors other than the operating body such as temperature change.

  As described above, the characteristics relating to the increase in the capacitance of the electrode due to factors other than the operating body such as a temperature change are affected by the parasitic capacitance of the electrode.

  Therefore, the input device according to the embodiment of the present invention has a configuration for suppressing the parasitic capacitance of the electrode.

  As a configuration for suppressing the parasitic capacitance of the electrode according to the embodiment of the present invention, for example, “a configuration in which parallel lines are arranged so as to be parallel to the sensor line connected to the electrode” can be cited. For example, the parallel line may be connected to an electrode separate from the electrode connected to the sensor line (for example, an electrode called a cancel electrode).

  In the configuration for suppressing the parasitic capacitance of the electrode, the input device according to the embodiment of the present invention performs control to suppress the parasitic capacitance of the electrode or control not to suppress the parasitic capacitance of the electrode.

  Hereinafter, the control for suppressing the parasitic capacitance of the electrode according to the embodiment of the present invention may be referred to as “cancellation control” (first control). Further, the control that does not suppress the parasitic capacitance of the electrode according to the embodiment of the present invention may be referred to as “non-cancel control” (second control).

  When cancel control (first control) is performed, the input device according to the embodiment of the present invention is a signal having the same waveform as the drive signal when a drive signal (voltage signal) for detection is applied to the electrode. (Voltage signal) is applied to the parallel wires.

  Moreover, when performing non-cancellation control (2nd control), the input device which concerns on embodiment of this invention does not apply the signal of the same waveform as a drive signal to a parallel line. When performing non-cancellation control, the input device according to the embodiment of the present invention may stop supplying the signal having the same waveform to the parallel line. Moreover, when performing non-cancellation control, the input device according to the embodiment of the present invention causes, for example, a parallel line to be in an open state (open state) or a state where it is connected to a reference potential point (ground). .

  FIG. 3 is an explanatory diagram for explaining a method for suppressing the parasitic capacitance of the electrode according to the embodiment of the present invention. FIG. 3A shows an example of a state when cancel control is not performed (that is, when non-cancel control is performed). A sensor line connected to an electrode (not shown), and a sensor line This parasitic capacitance Cp is shown. FIG. 3B shows an example of a state where cancel control is performed. A sensor line connected to an electrode (not shown), a parasitic capacitance Cp ′ related to the sensor line, a parallel line, and A parasitic capacitance Cpb related to the parallel line is shown.

  Here, the parasitic capacitance related to the sensor according to the embodiment of the present invention includes a parasitic capacitance of an electrode connected to the sensor line and a parasitic capacitance of the sensor line. Hereinafter, the parasitic capacitance related to the sensor may be referred to as an electrode parasitic capacitance.

  When cancel control is performed, the sensor line and the parallel line have the same potential. Therefore, in the above case, no parasitic capacitance is generated between the sensor line and the parallel line.

  Therefore, when cancel control is performed, for example, as shown in FIG. 3B, it is possible to reduce the parasitic capacitance related to the sensor line. Therefore, when cancel control is performed, the parasitic capacitance of the electrode can be suppressed.

  In addition, when cancel control is performed, it is possible to reduce the change in parasitic capacitance due to temperature change.

  When it is not determined that the operation on the electrode has been performed, the input device according to the embodiment of the present invention performs cancel control (first control) and determines the operation on the electrode.

  The input device according to the embodiment of the present invention compares the detected capacitance of the electrode with a determination threshold set for the electrode, for example, as illustrated with reference to FIG. The operation for the electrode is determined. That is, the input device according to the embodiment of the present invention determines whether or not an operation is performed on the electrode by threshold processing using the determination threshold.

  As described above, when cancel control is performed, the parasitic capacitance of the electrode can be suppressed. Therefore, the input device according to the embodiment of the present invention can more accurately determine the operation on the electrode when it is not determined that the operation on the electrode has been performed.

  In addition, in the input device according to the embodiment of the present invention, when it is determined that an operation is performed on the electrode, a change in the capacitance of the electrode other than the operation body is determined for the electrode determined to be operated. Is corrected to determine the operation on the electrode.

  Examples of the operation body according to the embodiment of the present invention include a part of the user's body such as the user's finger of the input device according to the embodiment of the present invention and an arbitrary object such as a pen-type object. It is done.

  In the input device according to the embodiment of the present invention, for example, correction of the change in the electrostatic capacitance of the electrode other than the operating body is, for example, “correcting the determination threshold by the change in the electrostatic capacitance of the electrode other than the operating body” Or “correcting the detected capacitance of the electrode by the amount of change in the capacitance of the electrode other than the operating body”. An example of a process (hereinafter, referred to as “correction process”) for correcting the change in capacitance of the electrode other than the operating body according to the embodiment of the present invention will be described later.

  When it is determined that the operation on the electrode has been performed, the input device according to the embodiment of the present invention switches between the cancel control (first control) and the non-cancel control (second control), and the input device other than the operation body A correction value for correcting the change in capacitance of the electrode is calculated.

Here, when it is determined that the operation on the electrode has been performed, the reason why the two types of control, the cancel control and the non-cancel control, are switched is as follows.
・ Reasons for non-cancellation control: To detect changes in electrode capacitance due to other than the operating body using the detection results of electrode capacitance when non-cancellation control is performed. Reason for performing: In order to determine the operation on the electrode using the detection result of the capacitance of the electrode when cancel control is performed.

The input device according to the embodiment of the present invention switches between cancel control and non-cancel control as in the example shown below, for example. Needless to say, examples of switching between cancel control and non-cancel control are not limited to the examples shown below.
The detection of the electrostatic capacitance of the electrode when cancel control is performed and the detection of the electrostatic capacitance of the electrode when non-cancel control is performed are alternately repeated.
“Electrode when non-cancellation control is performed after detection of capacitance of the electrode when cancellation control is performed M times (M is an integer of 2 or more such as M = 10, for example)” The detection of the electrostatic capacitance is repeated N times (N is an integer satisfying M> N, for example, N = 1).

  When the correction value is calculated, the input device according to the embodiment of the present invention corrects the change in capacitance due to other than the operating body by the calculated correction value. An example of the correction value calculation method according to the embodiment of the present invention will be described later.

  As described above, when it is determined that the operation on the electrode has been performed, the input device according to the embodiment of the present invention switches between two types of control, that is, the cancel control and the non-cancel control, so that the input device other than the operation body A correction value for correcting the change in capacitance of the electrode is calculated. Further, in the input device according to the embodiment of the present invention, the input device according to the embodiment of the present invention corrects the change in capacitance due to other than the operating body by the calculated correction value.

  Therefore, when it is determined that an operation has been performed on the electrode, the input device according to the embodiment of the present invention takes into account an increase in capacitance due to factors other than the operating body such as “Ct” illustrated in FIG. 2. Thus, it can be determined whether or not an operation has been performed on the electrode.

  Therefore, the input device according to the embodiment of the present invention can improve the determination accuracy of the operation by the operating tool.

[2] Configuration Example of Input Device According to Embodiment of the Present Invention Hereinafter, an example of the configuration of the input device according to the embodiment of the present invention will be described, and processing in the input device according to the embodiment of the present invention will be described more specifically. I will explain it.

  FIG. 4 is a block diagram showing an example of the configuration of the input device 100 according to the embodiment of the present invention. The input device 100 includes, for example, a switch unit 102, a detection unit 104, and a processing unit 106.

  The input device 100 includes, for example, a control unit (not shown), a ROM (Read Only Memory) (not shown), a RAM (Random Access Memory) (not shown), a storage unit (not shown), and the like. It may be. For example, the input device 100 connects the above-described components by a bus as a data transmission path. The input device 100 is driven by, for example, power supplied from an internal power source such as a battery provided in the input device 100 or power supplied from a connected external power source.

  The control unit (not shown) is configured by one or two or more processors configured by arithmetic circuits such as a CPU (Central Processing Unit), various processing circuits, and the like, and controls the entire input device 100. In addition, the control unit (not shown) may serve as the processing unit 106 in the input device 100, for example. Note that the processing unit 106 can also be configured by a dedicated circuit or a general-purpose circuit (for example, a processor separate from the control unit (not shown)) that can realize the processing in the processing unit 106. .

  The ROM (not shown) stores data such as programs and calculation parameters used by the control unit (not shown) and the processing unit 106, for example. The RAM (not shown) temporarily stores programs executed by a control unit (not shown) and the processing unit 106, processing data, and the like.

  The storage unit (not shown) is a storage unit included in the input device 100. The storage unit (not shown) stores various data such as data indicating a determination threshold corresponding to the electrodes constituting the switch unit 102 and application software.

  Here, examples of the storage unit (not shown) include a magnetic recording medium such as a hard disk, and a nonvolatile memory such as a flash memory. The storage unit (not shown) may be detachable from the input device 100.

[2-1] Switch unit 102
The switch unit 102 has at least one electrode E. When the switch unit 102 includes two or more electrodes E, the plurality of electrodes E are provided apart from each other. Hereinafter, for convenience of explanation, a case where the switch unit 102 has one electrode E will be described.

  The electrode E is an electrode whose capacitance is to be detected in the detection unit 104, and is connected to a sensor line. For example, a drive signal is applied to the electrode E from a voltage source 110 described later via a sensor line.

  The electrode E corresponds to, for example, an electrostatic sensor (electrostatic switch) that can be operated by a user of the input device 100. The input device 100 includes a plurality of electrostatic sensors corresponding to the number of electrodes E constituting the switch unit 102.

[2-2] Parallel Line In the input device 100, the parallel line is arranged so as to parallel to the sensor line connected to the electrode E. The parallel lines are arranged in the vicinity of the corresponding sensor lines so as to realize the suppression of the parasitic capacitance shown in FIG. 3, for example. The interval between the sensor line and the parallel line can be set as appropriate based on the wiring material, layout, and the like.

  For example, the parallel line is electrically connected to a voltage source 110 described later via a switching circuit SW4 described later. The input device according to the embodiment of the present invention is electrically connected to a voltage source different from the voltage source 110 in which the parallel line outputs a signal having the same waveform as the drive signal applied to the electrode E. Configuration ”.

  The parallel line corresponds to a configuration for suppressing the parasitic capacitance of the electrode E in the input device 100. For example, as illustrated with reference to FIG. 3, in the input device 100, cancel control is performed, and a signal having the same waveform as the drive signal applied to the electrode E is supplied to the parallel line. The parasitic capacitance of the electrode E is suppressed.

  When the switch unit 102 includes a plurality of electrodes E, a parallel line is provided for each electrode E so as to run in parallel to a sensor line connected to each of the electrodes E.

[2-3] Detection unit 104
The detection unit 104 detects the capacitance of the electrode E by a self-capacitance method.

  The detection unit 104 includes, for example, a voltage source 110, a measurement circuit 112, switching circuits SW1, SW2, SW3, and SW4, and ground capacitors Cp and Cpb.

  When the switch unit 102 includes a plurality of electrodes E, the detection unit 104 has the same configuration as that of FIG.

  The ground capacitor Cp is connected, for example, between the electrode E and the switching circuit SW1. The ground capacitor Cp may be a parasitic capacitor or a circuit element such as a capacitor. The ground capacitance Cp is a capacitance corresponding to the electrode E.

  The ground capacitance Cpb is, for example, a parasitic capacitance related to a parallel line. Further, the ground capacitance Cpb may be, for example, a circuit element such as a capacitor connected to the parallel line.

  The voltage source 110 outputs a drive signal (voltage signal) for driving the electrode E. Note that the voltage source 110 may be a voltage source external to the input device 100. When the switch unit 102 includes a plurality of electrodes E, a voltage source that outputs a drive signal to each electrode E includes a different voltage source provided for each electrode E. When the switch unit 102 includes a plurality of electrodes E, part or all of the voltage sources corresponding to the plurality of electrodes E may be the same voltage source.

  For example, the measurement circuit 112 detects a capacitance value (self-capacitance value) by measuring a charging time of the capacitor. The measurement circuit 112 measures the capacity charging time using, for example, one or more comparators, and obtains the capacity value from the measured charging time.

  Note that the measurement circuit 112 is not limited to the example shown above. The measurement circuit 112 can take a configuration corresponding to any method capable of measuring a capacitance value.

  The switching circuits SW1, SW2, SW3, and SW4 are configured by, for example, switching transistors, and are turned on (conductive state) or off (non-conductive state) depending on the signal level (voltage level) of the applied signal.

  Examples of the switching transistor include bipolar transistors, and FETs (Field-Effect Transistors) such as TFTs (Thin Film Transistors) and MOSFETs (Metal-Oxide-Semiconductor Field Effect Transistors).

  Switching of the ON state and the OFF state of each of the switching circuits SW1, SW2, SW3, and SW4 is performed by the processing unit 106, for example. In addition, switching of each of the switching circuits SW1, SW2, SW3, SW4 may be performed by, for example, a control unit (not shown) or an external controller connected to the input device 100. Good.

  Note that the switching circuits SW1, SW2, SW3, and SW4 are not limited to switching transistors, and may be any elements (or circuits) that can be switched between an on state and an off state.

In the detection unit 104, for example, the capacitance value (self-capacitance value) of the electrode E is detected in the measurement circuit 112 by switching the ON state and the OFF state of the switching circuits SW1, SW2, and SW3 as described below. .
・ Switching circuit SW1, SW2: ON state ・ Switching circuit SW3: OFF state

The switching circuit SW3 is a switching circuit for initializing the measurement of the capacitance value. For example, the switching circuit SW1, SW2, and SW3 are switched on and off as described below. Initialization of measurement of the capacitance value of the electrode E is performed.
・ Switching circuit SW3: ON state ・ Switching circuit SW1, SW2: OFF state

  The switching circuit SW4 is a switching circuit for switching between two types of control, that is, cancel control (first control) and non-cancel control (second control).

  For example, when the switching circuit SW4 is in an on state, the parallel line and the voltage source 110 are electrically connected, and a drive signal is supplied from the voltage source 110 to the parallel line. Therefore, when the switching circuit SW4 is in the on state, the input device 100 performs cancel control on the electrode E.

  Further, for example, when the switching circuit SW4 is turned off, the electrical connection between the parallel line and the voltage source 110 is cut off, and the parallel line is in an open state (open state). Therefore, when the switching circuit SW4 is in the OFF state, the input device 100 performs non-cancel control on the electrode E.

  The detection unit 104 detects the capacitance value (self-capacitance value) of the electrode E, for example, with the configuration shown in FIG. In addition, the detection unit 104 having the configuration illustrated in FIG. 4 realizes that the input device 100 performs switching between cancel control and non-cancel control.

  The configuration of the detection unit 104 is not limited to the example illustrated in FIG.

  For example, the detection unit 104 can take any configuration that can measure the capacitance value (self-capacitance value) of the electrode E.

  The detection unit 104 may be configured to realize non-cancellation control by setting the parallel line to a state where the parallel line is connected to a reference potential point (ground).

[2-4] Processing unit 106
The processing unit 106 determines an operation on the electrode E based on the detected change in the capacitance of the electrode E.

  As the processing unit 106, for example, one or two or more processors configured by an arithmetic circuit such as a CPU may be used.

  The processing unit 106 compares the detected capacitance of the electrode E with a determination threshold set for the electrode E, and determines an operation on the electrode E. That is, the processing unit 106 determines an operation on the electrode E by threshold processing using the detected capacitance of the electrode E and the determination threshold.

  The processing unit 106 performs an operation on the electrode E when the detected capacitance of the electrode E is equal to or larger than the determination threshold (or when the detected capacitance of the electrode E is larger than the determination threshold). It is determined that In addition, the processing unit 106 performs an operation on the electrode E when the detected capacitance of the electrode E is smaller than the determination threshold (or when the detected capacitance of the electrode E is equal to or less than the determination threshold). Judge that it is not.

  Further, the processing unit 106 performs cancel control (first control) or non-cancel control (second control). When performing the cancel control, for example, the processing unit 106 turns on the switching circuit SW4 configuring the detection unit 104. Moreover, when performing non-cancellation control, the process part 106 makes switching circuit SW4 which comprises the detection part 104 into an OFF state, for example.

  More specifically, for example, as shown in (1) to (3) below, the processing unit 106 performs cancel control or non-cancel control based on the determination state of the operation on the electrode E, and performs control on the electrode E. Determine the operation.

(1) When it is not determined that the operation on the electrode E has been performed When the operation unit 106 does not determine that the operation on the electrode E has been performed, the processing unit 106 performs cancel control (first control). The operation for is determined.

  As described above, when the cancel control is performed when it is not determined that the operation on the electrode E has been performed, the processing unit 106 can more accurately determine the operation on the electrode E.

(2) When it is determined that an operation on the electrode E has been performed The processing unit 106 switches between cancel control (first control) and non-cancel control (second control), and performs an electrode E other than the operation body. The operation on the electrode E is determined by correcting the change in the electrostatic capacity.

  The processing unit 106 switches between cancel control and non-cancel control, and calculates a correction value for correcting the change in the capacitance of the electrode E other than the operating body.

  For example, the processing unit 106 detects the capacitance of the electrode E detected when cancel control (first control) is performed and the electrode E detected when non-cancel control (second control) is performed. The correction value is calculated on the basis of the capacitance.

Hereinafter, the capacitance of the electrode E detected when cancel control is performed and the capacitance of the electrode E detected when non-cancel control is performed are expressed as follows, and the correction value of An example of processing related to calculation (hereinafter, referred to as “correction value calculation processing”) will be described.
In the case where cancel control is performed, the capacitance (that is, parasitic capacitance) of the electrode E detected before it is determined that the operation has been performed: Cp1 ′
When the cancel control is performed, the capacitance of the electrode E detected after it is determined that the operation has been performed: Cpa
When the non-cancellation control is performed, the capacitance of the electrode E detected after determining that the operation has been performed: (Cp + Cf)

  In the following description, when it is determined that an operation has been performed, the capacitance caused by the operating body is represented as “Cf”, and the change in the capacitance of the electrode E other than the operating body is represented by “Ct”. . In the following description, it is assumed that the non-cancel control is performed when it is not determined that the operation is performed, and the static of the electrode E that is estimated to be detected before the operation is determined is determined. The electric capacity (that is, parasitic capacity) is expressed as “Cp”.

  The correction value calculated in the correction value calculation process is a value for correcting the change Ct of the capacitance of the electrode E other than the operating body, and the capacitance of the electrode E caused by factors other than the operating body. This corresponds to the change amount Ct. Therefore, hereinafter, the correction value calculated in the correction value calculation process may be expressed as “correction value Ct”.

  The capacitance Cf resulting from the operating body is expressed by the following formula 1, for example.

  Here, when the capacitance Cp when the non-cancel control is performed is sufficiently larger than the capacitance Cf caused by the operating body, the capacitance detected when the non-cancel control is performed. (Cp + Cf) can be approximated as shown in Equation 2 below.

  Therefore, if the capacitance Cp when the non-cancel control is performed is sufficiently larger than the capacitance Cf caused by the operating body, the capacitance detected when the non-cancel control is performed ( Measuring the state transition of Cp + Cf), that is, measuring the state transition of the capacitance Cp when non-cancellation control is performed, measures the change Ct in the capacitance of the electrode E other than the operating body. It is synonymous with that.

  Here, as an example of the case where the capacitance Cp when the cancel control is performed is sufficiently larger than the capacitance Cf caused by the operating body, the capacitance Cp when the cancel control is performed is 100. In [pF], the case where the capacitance Cf resulting from the operating body is 0.5 [pF] is mentioned. Needless to say, the example in which the electrostatic capacitance Cp when the cancel control is performed is sufficiently larger than the electrostatic capacitance Cf caused by the operating body is not limited to the example shown above.

  For example, the processing unit 106 subtracts the electrostatic capacitance Cf caused by the operating body from the electrostatic capacitance (Cp + Cf) detected when non-cancellation control is performed, so that the electrostatic capacitance when cancellation control is performed is performed. The capacity Cp is calculated.

  Then, for example, the processing unit 106 cancels the cancellation by comparing the ratio between the electrostatic capacitance Cp and the electrostatic capacitance Cf caused by the operating body when cancellation control is performed with a predetermined threshold value that is set. It is determined whether or not the capacitance Cp when the control is performed is sufficiently larger than the capacitance Cf caused by the operating body. Further, the processing unit 106 compares, for example, a difference value obtained by subtracting the electrostatic capacitance Cf caused by the operating body from the electrostatic capacitance Cp when cancel control is performed, and a set predetermined threshold value. Further, it may be determined whether or not the electrostatic capacitance Cp when the cancel control is performed is sufficiently larger than the electrostatic capacitance Cf caused by the operating body. The predetermined threshold value may be a fixed threshold value set in advance, or may be a variable value that can be changed by an operation of the user of the input device 100 or the like.

  The processing unit 106 calculates the capacitance fluctuation ratio of the capacitance of the electrode E in a predetermined period using the state transition of the capacitance Cp when the non-cancel control as described above is performed. The calculated capacitance variation ratio of the capacitance of the electrode E corresponds to the capacitance variation ratio of the capacitance caused by other than the operating body in a predetermined period. Here, the predetermined period may be a fixed period set in advance, or may be a variable period that can be changed by an operation of the user of the input device 100 or the like.

  The processing unit 106 performs, for example, the calculation shown in the following Equation 3 based on the electrostatic capacitance (Cp + Cf) of the electrode E detected when the non-cancel control (second control) is performed, thereby performing the electrode E The capacitance fluctuation ratio Rc of the electrostatic capacity is calculated.

  “Cp1” shown in Formula 3 is a capacitance (Cp + Cf) when non-cancellation control is performed, which is detected at a certain time after it is determined that the operation on the electrode E is performed. Further, “Cp2” shown in the above equation 3 is a non-cancellation control detected when a predetermined period has elapsed (or after a predetermined period has elapsed) from the time when the capacitance Cp1 was detected. Capacitance (Cp + Cf) in the case of being performed.

  As described above, the capacitance of the electrode E can increase due to factors other than the operating body such as temperature change and humidity change. Therefore, the relationship between the capacitance Cp1 and the capacitance Cp2 is basically “Cp2 ≧ Cp1”. That is, the capacitance fluctuation ratio Rc of the capacitance of the electrode E is basically 0 (zero) or a positive value. Here, the case where the capacitance fluctuation ratio Rc is 0 (zero) corresponds to the case where the capacitance of the electrode E does not change due to other than the operating body.

  When the capacitance of the electrode E decreases due to some cause, the capacitance fluctuation ratio Rc of the capacitance of the electrode E becomes a negative value from the above Equation 3. Even when the capacitance fluctuation ratio Rc is a negative value, the processing unit 106 corrects the correction value corresponding to the change Ct of the capacitance of the electrode E due to factors other than the operating body by the calculation shown in Equation 4 described later. Ct can be calculated. Hereinafter, a case where the capacitance fluctuation ratio Rc of the capacitance of the electrode E is 0 (zero) or a positive value will be mainly described.

  Here, the capacitance variation ratio Rc of the capacitance of the electrode E is the same when cancel control is performed and when non-cancel control is performed.

  Therefore, the processing unit 106 calculates a correction value Ct corresponding to the change amount Ct of the capacitance of the electrode E due to factors other than the operating body, for example, by performing the calculation shown in the following mathematical formula 4. Here, “Cp1 ′” shown in Equation 4 below is the capacitance of the electrode E detected before it is determined that the operation is performed in the case where the cancel control (first control) is performed, that is, This is the capacitance when no operation is performed on the electrode E when cancel control (first control) is performed.

  The processing unit 106 calculates a correction value for correcting the change in the capacitance of the electrode E due to other than the operating body, for example, by performing the calculation shown in the above formula 4.

  As described above, the capacity fluctuation ratio Rc used for calculating the correction value basically indicates 0 (zero) or a positive value.

  When the capacitance fluctuation ratio Rc is 0 (zero), it corresponds to a case where the capacitance of the electrode E does not change due to other than the operating body as described above. When the capacitance fluctuation ratio Rc is 0 (zero), the correction value Ct is 0 (zero) according to the above equation 4. Therefore, the correction of the change in the capacitance of the electrode E by the other than the operating body by the correction value Ct is as follows. Practically not done.

  Further, when the capacitance fluctuation ratio Rc is a positive value, the correction value Ct is a positive value according to the above equation 4, and the correction of the increase in the capacitance of the electrode E by other than the operating body by the correction value Ct is as follows. Done. If the capacitance fluctuation ratio Rc becomes a negative value due to some factor, the correction value Ct becomes a negative value according to the above equation 4, and the amount of decrease in the capacitance of the electrode E due to other than the operating body due to the correction value Ct. Is corrected.

  Note that the method of calculating the correction value according to the embodiment of the present invention is not limited to performing the calculation shown in Equation 4 above.

  For example, the processing unit 106 can calculate the correction value Ct corresponding to the change amount Ct of the capacitance of the electrode E due to factors other than the operating body by performing the calculation of the following Expression 5. Here, “a” shown in Expression 5 is a coefficient for correcting the capacitance fluctuation ratio Rc of the capacitance of the electrode E, and is obtained by, for example, the calculation of Expression 6 below.

  For example, in the case where the correction value Ct is calculated by the above equation 5, the processing unit 106 takes into account the relationship between the electrostatic capacitance Cp and the electrostatic capacitance Cf caused by the operating body when cancel control is performed. Ct can be calculated. That is, for example, when the correction value Ct is calculated by the above formula 5, even when the capacitance Cp when the cancel control is performed is not sufficiently large with respect to the capacitance Cf caused by the operating body. The correction value Ct can be calculated.

  Further, the processing unit 106 calculates the correction value Ct based on the determination result as to whether or not the electrostatic capacitance Cp when the cancel control is performed is sufficiently larger than the electrostatic capacitance Cf caused by the operating body. You may change the method.

  For example, when it is determined that the electrostatic capacitance Cp when cancel control is performed is sufficiently larger than the electrostatic capacitance Cf caused by the operating body, for example, the processing unit 106 uses the above Equation 4. A correction value Ct is calculated. Further, for example, when it is not determined that the electrostatic capacitance Cp when cancel control is performed is sufficiently large with respect to the electrostatic capacitance Cf caused by the operating body, the processing unit 106 calculates the correction value Ct using Equation 5 above. calculate.

  When the correction value Ct is calculated as described above, the processing unit 106 corrects the change in the capacitance of the electrode E due to other than the operating body by the calculated correction value Ct.

  For example, the processing unit 106 performs an operation by performing a correction process according to the first example shown in (2-1) below or a correction process according to the second example shown in (2-2) below. The change in capacitance of the electrode E due to other than the body is corrected.

(2-1) First Example of Correction Processing The processing unit 106 corrects a determination threshold value used in threshold processing related to determination of an operation on the electrode E with the correction value Ct calculated by the correction value calculation processing. Then, the amount of change in the capacitance of the electrode E other than the operating body is corrected.

  For example, the processing unit 106 adds the correction value Ct to the determination threshold corresponding to the electrode E, thereby correcting the determination threshold by the amount of change in the capacitance of the electrode E other than the operating body. The processing unit 106 specifies the determination threshold corresponding to the electrode E by reading data indicating the determination threshold corresponding to the electrode E from, for example, a recording medium such as a storage unit (not shown).

(2-2) Second Example of Correction Processing The processing unit 106 calculates the detected capacitance of the electrode E, which is used in threshold processing related to determination of an operation on the electrode E, by the correction value calculation processing. By correcting with the correction value Ct, the amount of change in the capacitance of the electrode E other than the operating body is corrected. Here, examples of the detected capacitance of the electrode E include the capacitance of the electrode E detected when cancel control is performed.

  For example, the processing unit 106 subtracts the correction value Ct from the detected capacitance of the electrode E, thereby changing the detected capacitance of the electrode E to the amount of change in the capacitance of the electrode E other than the operating body. to correct.

  For example, the processing unit 106 performs a correction process according to the first example shown in the above (2-1) or a correction process according to the second example shown in the above (2-2). The change in capacitance of the electrode E is corrected. And the process part 106 determines operation with respect to the electrode E by performing the threshold value process which concerns on determination of operation with respect to the electrode E. FIG.

  FIG. 5 is an explanatory diagram for explaining an example of “determination of operation on the electrode E after correcting the change in capacitance of the electrode E due to other than the operation body” according to the embodiment of the present invention. FIG. 5 shows “an example of determination of an operation on the electrode E when the correction processing according to the first example shown in (2-1) is performed and the determination threshold is corrected by the correction value Ct”. Show.

  “Cp1 ′” illustrated in FIG. 5 indicates the electrostatic capacitance of the electrode E, that is, the parasitic capacitance of the electrode E, which is detected before it is determined that the operation is performed when cancel control is performed. Also, “Cf” shown in FIG. 5 indicates the amount of increase in capacitance that is increased by the operation of the operating body, as in FIGS. 1 and 2, and “Ct” shown in FIG. Similarly, the increase amount of the electrostatic capacitance which increases due to factors other than the operating body such as temperature change and humidity change is shown.

  Further, “Ct” shown in FIG. 5 indicates the correction value calculated by the above formula 4 or the above formula 5. When the correction processing according to the first example shown in (2-1) is performed, the corrected value is added to the determination threshold value before correction as illustrated in FIG. A threshold is obtained.

  Further, “ON” shown in FIG. 5 indicates a state where it is determined that an operation is performed on the electrostatic sensor corresponding to the electrode E, as in FIGS. 1 and 2, and “OFF” shown in FIG. 5. 1 shows a state where it is not determined that an operation has been performed on the electrostatic sensor corresponding to the electrode E, as in FIGS.

  When it is not determined that an operation has been performed on the electrostatic sensor corresponding to the electrode E, the processing unit 106 performs cancel control and determines an operation on the electrode E.

  When an operation with the operating tool is performed on the electrostatic sensor corresponding to the electrode E, the capacitance of the detected electrode E is increased by the operation with the operating tool, as in the example shown in FIG. 1 (FIG. 5). From "Cp1 '" to "Cp1' + Cf"). The processing unit 106 corresponds to the electrode E when the detected capacitance of the electrode E is equal to or greater than the determination threshold (or when the detected capacitance of the electrode E is greater than the determination threshold). It is determined that an operation has been performed on the electrostatic sensor.

  Further, when it is determined that an operation has been performed on the electrostatic sensor corresponding to the electrode E, the processing unit 106 switches between cancel control and non-cancel control, and performs the calculation of Formula 4 or Formula 5 above. Thus, the correction value Ct corresponding to the electrode E is calculated. The processing unit 106 corrects the determination threshold by adding the calculated correction value Ct to the set determination threshold (from “determination threshold (before correction)” illustrated in FIG. 5 to “determination threshold (correction)”. After) Correction to “)”.

  Here, when the capacitance of the electrode increases due to factors other than the operating body due to, for example, a temperature change caused by the heat of the operating body, the detected electrode E is detected as in the example shown in FIG. The capacitance further increases (increase from “Cp1 ′ + Cf” shown in FIG. 5 to “Cp1 ′ + Cf + Ct”).

  Further, when the operation by the operating body is not performed on the electrostatic sensor corresponding to the electrode E, the electrostatic capacity of the detected electrode E is reduced by the operation by the operating body being stopped (see FIG. 5). (Decrease from “Cp1 ′ + Cf + Ct” to “Cp1 ′ + Ct”).

  The processing unit 106 compares the detected capacitance of the electrode E with the corrected determination threshold ("determination threshold (after correction)" illustrated in FIG. 5) to determine an operation on the electrode E. Examples of the detected capacitance of the electrode E include the capacitance of the electrode E detected when cancel control is performed.

  Specifically, the processing unit 106 (or is detected) when the detected capacitance of the electrode E becomes smaller than the corrected determination threshold (“determination threshold (after correction)” shown in FIG. 5). When the capacitance of the electrode E is equal to or less than the corrected determination threshold value), it is determined that the operation is not performed on the electrostatic sensor corresponding to the electrode E. Further, the processing unit 106 determines that the detected electrode E has a capacitance greater than or equal to the corrected determination threshold (“determination threshold (after correction)” shown in FIG. 5) (or the detected electrode E If the capacitance is larger than the corrected determination threshold value), it is determined that an operation is being performed on the electrostatic sensor corresponding to the electrode E.

  Here, as described above, the correction value Ct corresponds to a change in the capacitance of the electrode E due to factors other than the operating body such as a temperature change and a humidity change.

  Accordingly, when the operation by the operating body is not performed on the electrostatic sensor corresponding to the electrode E, the capacitance after the operation by the operating body is reduced (“Cp1 ′ + Ct shown in FIG. 5). ") Is smaller than the corrected determination threshold (" determination threshold (after correction) "shown in FIG. 5), as shown in FIG.

  Therefore, even when the capacitance of the electrode E increases due to factors other than the operating body such as a temperature change in the electrode E, the processing unit 106 uses the operating body for the electrostatic sensor corresponding to the electrode E. Whether or not an operation is being performed can be determined more accurately.

  Even when the correction processing according to the second example shown in (2-2) is performed, the change in the capacitance of the electrode E due to factors other than the operating body is corrected by the correction value Ct. The Therefore, even when the correction process according to the second example shown in (2-2) is performed, similarly to the case where the correction process according to the first example shown in (2-1) is performed. The processing unit 106 can more accurately determine whether or not an operation by the operating body is performed on the electrostatic sensor corresponding to the electrode E.

(3) When it is determined that an operation on the electrode E has not been performed after it has been determined that an operation on the electrode E has been performed

  When it is determined that the operation on the electrode E is not performed after it is determined that the operation on the electrode E has been performed, the processing unit 106 cancels control (first control) as in the case of (1) above. To determine the operation on the electrode E. Therefore, the processing unit 106 can determine the operation on the electrode E more accurately as in the case of (1) above.

  For example, as illustrated in the above (1) to (3), the processing unit 106 performs cancel control or non-cancel control based on the determination state of the operation on the electrode E, and determines the operation on the electrode E. In addition, for example, as illustrated in (2) above, when it is determined that the operation on the electrode E has been performed, the processing unit 106 corrects the change in capacitance due to other than the operation body, and performs the operation on the electrode E. Determine the operation.

  In addition, the process in the process part 106 which concerns on embodiment of this invention is not restricted to the example shown above.

  For example, when it is determined that no operation is performed on the electrostatic sensor corresponding to the electrode E as a result of the threshold processing using the corrected determination threshold being performed on the electrode E, the processing unit 106 can further perform “a process of returning the determination threshold value corrected by performing the correction process according to the first example shown in (2-1) above to the determination threshold value before correction”.

  For example, if the processing unit 106 determines that the capacitance of the electrode E that is determined not to perform the above operation is smaller than the determination threshold value before correction, the processing unit 106 sets the corrected determination threshold value before correction. Return to the decision threshold.

  For example, with the configuration shown in FIG. 4, the input device 100 performs cancel control or non-cancel control based on the determination state of the operation on the electrode E, and based on the detected change in capacitance of the electrode E, The operation for E is determined. In addition, when it is determined that the operation on the electrode E has been performed, the input device 100 corrects the change in capacitance due to other than the operation body, and determines the operation on the electrode E.

  Therefore, the input device 100 can improve the determination accuracy of the operation by the operating tool.

  Needless to say, the configuration of the input device according to the embodiment of the present invention is not limited to the configuration shown in FIG. 4.

  Further, for example, by an input device having the same function as the switch unit 102 and the detection unit 104 illustrated in FIG. 4 and a processing device (for example, a microcomputer outside the input device) having the same function as the processing unit 106. A system having functions similar to those of the input device 100 shown in FIG. 4 is realized.

[3] Application Example of Input Device According to Embodiment of the Present Invention An input device according to an embodiment of the present invention is a vehicle system such as a vehicle such as a car (or a UI (User Interface) part constituting a vehicle system). It can be applied to various systems and devices such as communication devices such as mobile phones and smartphones, tablet devices, television receivers, and computers such as PCs (Personal Computers).

[4] Program according to the embodiment of the present invention A program for causing a computer to function as the input device according to the embodiment of the present invention (for example, a program for causing the computer to function as the processing unit 106 illustrated in FIG. 4) By being executed by the processor or the like, it is possible to improve the determination accuracy of the operation by the operating body.

  Further, a program for causing a computer to function as an input device according to the embodiment of the present invention is executed by a processor or the like in the computer, whereby the processing in the input device according to the above-described embodiment of the present invention (for example, FIG. The effect produced by the processing in the processing unit 106 shown in FIG. 4 can be achieved.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to the example which concerns. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Understood.

  For example, in the above description, it is shown that a program (computer program) for causing a computer to function as an input device according to the embodiment of the present invention is provided. However, the embodiment of the present invention further stores the program. The recorded recording medium can also be provided.

DESCRIPTION OF SYMBOLS 100 Input device 102 Switch part 104 Detection part 106 Processing part E Electrode

Claims (7)

An electrode connected to the sensor line and applied with a drive signal;
A parallel line arranged to run parallel to the sensor line;
A detection unit for detecting a capacitance of the electrode;
A processing unit that determines an operation on the electrode based on the detected change in the capacitance;
With
The processor is
Performing a first control to apply a signal having the same waveform as the drive signal to the parallel line, or a second control not to apply a signal having the same waveform to the drive signal to the parallel line;
When it is determined that an operation on the electrode has been performed, the input device is configured to determine an operation on the electrode by correcting a change in the capacitance caused by other than the operating body. The processor is
If it is not determined that an operation has been performed on the electrode, the first control is performed,
When it is determined that an operation has been performed on the electrode, a correction value for correcting the change in the capacitance due to other than the operating body by switching between the first control and the second control is calculated. The input device according to claim 1, wherein the change in the capacitance due to other than the operating body is corrected by the calculated correction value.   The processing unit calculates the correction value based on the capacitance detected when the first control is performed and the capacitance detected when the second control is performed. The input device according to claim 2, wherein calculation is performed. The processor is
Based on the capacitance detected when the second control is performed, a capacitance fluctuation ratio of the capacitance in a predetermined period is calculated,
The correction value is calculated by multiplying the capacitance when the operation for the electrode is not performed in the case where the first control is performed by the capacitance variation ratio. 3. The input device according to 3. The processor is
Comparing the detected capacitance with a determination threshold set for the electrode to determine an operation on the electrode;
5. The method according to claim 1, wherein, when it is determined that an operation on the electrode has been performed, the determination threshold value is corrected by a change in the electrostatic capacity other than by an operating body. 6. The input device described. The processor is
Comparing the detected capacitance with a determination threshold set for the electrode to determine an operation on the electrode;
5. The method according to claim 1, wherein when it is determined that an operation has been performed on the electrode, the detected capacitance is corrected by a change in the capacitance other than by an operating body. The input device according to claim 1.   If it is determined that an operation on the electrode has not been performed after it has been determined that an operation has been performed on the electrode, the processing unit performs the first control to determine an operation on the electrode. The input device according to claim 1, wherein the input device is a device.

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