JP6504937B2 - INPUT DETERMINATION DEVICE, CONTROL PROGRAM, ELECTRONIC DEVICE, AND INPUT THRESHOLD CALIBRATING METHOD OF INPUT DETERMINATION DEVICE - Google Patents

Description

  The present invention relates to an input determination device, a control program, an electronic device, and an input threshold calibration method of the input determination device.

  An electronic device such as a smartphone includes an input determination device that determines the presence or absence of a touch input operation on a touch panel, and executes processing according to the touch input operation. When the sensor input value detected via the electrostatic sensor provided on the touch panel exceeds the touch threshold, the input determination apparatus determines that an input operation by touch is performed on the operation input surface.

  However, the sensor input value obtained from the electrostatic sensor changes due to the temperature change around the electrostatic sensor and the temperature of the finger of the person touching the touch panel. As a result, although the touch input operation is not performed, the sensor input value exceeds the touch threshold value, and it is erroneously determined that the touch input operation is performed.

  Therefore, the conventional input determination device has a function of updating the touch threshold according to the change of the sensor input value based on the temperature change, and prevents the erroneous determination due to the influence of the temperature.

  The control device of the touch panel described in Patent Document 1 determines for each sensor pair whether or not the decrease in capacitance before a predetermined number of scans is equal to or greater than the update determination threshold, and the decrease in capacitance is equal to or greater than the update determination threshold. The touch threshold is updated by updating the held baseline value for the two sensors that constitute the sensor pair. As a result, it is possible to prevent an erroneous determination of the presence or absence of touch input due to the influence of ambient temperature changes and the temperature of human fingers.

JP, 2015-11558, A (January 19, 2015 publication)

  However, the control device of the touch panel described in Patent Document 1 calculates the difference between the sensor input value and the predetermined reference value for each sensor, and updates the threshold based on the difference. Therefore, when there is a local and sudden change in the sensor input value in a certain sensor, the threshold value of the sensor is greatly fluctuated, and the detection accuracy and stability of the input operation are lowered.

  In addition, when the threshold value is largely changed, the sensor sensitivity may be calibrated unintentionally.

  Therefore, the present invention has been made in view of the above problems, and an object thereof is an input determination device, a control program, an electronic device, and an electronic device that suppress erroneous determination of input operation due to significant fluctuation of the input threshold. An object of the present invention is to provide an input threshold calibration method of an input determination device.

  In order to solve the above-mentioned subject, an input judging device concerning one mode of the present invention detects a plurality of sensor input values corresponding to a plurality of places in operation input side, and detects the above-mentioned sensor input value and an input threshold. An input determination device that determines the presence or absence of an input operation on the operation input surface based on a difference, comprising: a calibration unit that updates the input threshold by calibrating a sensor sensitivity at a predetermined timing; The unit is characterized in that the sensor sensitivity is calibrated based on an average value of the sensor input values not exceeding the input threshold among the plurality of sensor input values.

  In order to solve the above-mentioned subject, the input threshold calibration method of the input judging device concerning one mode of the present invention detects a plurality of sensor input values corresponding to a plurality of places in an operation input side, and detects the above-mentioned sensor An input threshold calibration method of an input determination device that determines the presence or absence of an input operation on the operation input surface based on a difference between an input value and an input threshold, the input threshold being calibrated by calibrating sensor sensitivity at a predetermined timing. And correcting the sensor sensitivity based on an average value of the sensor input values not exceeding the input threshold among the plurality of sensor input values. Do.

  According to one aspect of the present invention, it is possible to suppress an erroneous determination of an input operation due to significant fluctuation of the input threshold due to unintended calibration.

It is a top view which shows schematic structure of the mobile telephone which concerns on Embodiment 1 of this invention. It is a top view which shows the structure of an input part, (a) is an overlay and an operation key, (b) is a key sheet, (c) is an insulating substrate, (d) is an electrostatic sensor. It is sectional drawing which shows the positional relationship of each structure of an input part, (a) is an overlay and an operation key, (b) is a key sheet, (c) is an insulating substrate, (d) is electrostatic. It is a sensor. It is a block diagram showing a part of composition of a mobile phone concerning Embodiment 1 of the present invention. It is a flowchart which shows the update process which updates a reference value in the input determination part which concerns on Embodiment 1 of this invention in order of a process. It is a figure which shows the relationship between the count value and the touch threshold value which respond | correspond between each electrode, (a) shows the state where count value exceeded the touch threshold value by touch input, (b) is accompanied by the fall of the surrounding temperature. And the count value is increasing. FIG. 6 is a cross-sectional view of the mobile phone when key input is performed on the operation input surface. It is a figure which shows the relationship of the count value and key threshold value which respond | correspond between each electrode. It is a figure which shows an example of the relationship between the count value and key threshold value which correspond between each electrode. It is a figure which shows schematic structure of the smart phone which concerns on Embodiment 2 of this invention, (a) is a top view, (b) is sectional drawing.

Embodiment 1
Hereinafter, the electronic device according to the first embodiment of the present invention will be described in detail based on FIGS. In the following description, a mobile phone will be described as an example of the electronic device.

<Mobile phone>
FIG. 1 is a plan view showing a schematic configuration of a mobile phone according to the present embodiment. A mobile phone 100 (electronic device) includes an input unit 1 having an operation input surface 10 capable of inputting an operation by a user, and a display unit 2 for displaying an image or the like. An operation key 11 (key) is disposed on the operation input surface 10, and the mobile phone 100 detects a key input and a touch input by the user on the operation input surface 10, and predetermined according to the key input operation and the touch input operation. Perform the processing of

  FIG. 2 is a plan view showing the configuration of the input unit 1, where (a) is an overlay and operation keys, (b) is a key sheet, (c) is an insulating substrate, and (d) is a static It is an electric sensor.

  FIG. 3 is a cross-sectional view showing the positional relationship between the components of the input unit 1. FIG. 3 (a) is an overlay and operation keys, FIG. 3 (b) is a key sheet, and FIG. d) is an electrostatic sensor.

  As shown in FIGS. 2 and 3, the input unit 1 has a structure in which the overlay 12 and the operation keys 11, the key sheet 20, the insulating substrate 30, and the electrostatic sensor 40 are stacked in this order.

<Operation input surface>
As shown in (a) of FIG. 2, an overlay 12 is provided on the surface side of the input unit 1, and the operation key 11 is exposed on the surface of the input unit 1 from the opening formed in the overlay 12. . The surface of the overlay 12 and the surface of the operation key 11 constitute an operation input surface 10. As shown to (a) of FIG. 3, the operation key 11 has the projection part 13 which protrudes on the back side.

<Key sheet>
As shown in (b) of FIG. 3, a key sheet 20 is provided on the back side of the operation input surface 10. As shown in FIG. 2B, the key sheet 20 is formed with a convex portion 21 having a dome shape at a position corresponding to the operation key 11 (directly below the operation key 11). The convex portion 21 is formed of a conductive material. The convex portion 21 has flexibility, and is deformed in response to pressure when the operation key 11 is pressed.

<Insulating layer>
As shown in (c) of FIG. 3, an insulating substrate 30 is provided on the back side of the key sheet 20 so as to face the key sheet 20.

<Electrostatic sensor>
As shown in (d) of FIG. 3, an electrostatic sensor 40 is provided on the back side of the insulating substrate 30. As shown in (d) of FIG. 2, the electrostatic sensor 40 includes a detection substrate 41 and a plurality of X detection electrodes 42 (sensor electrodes) and Y detection electrodes 43 (sensor electrodes) formed on the detection substrate 41. And detects proximity or touch (touch input) of an object on the operation input surface 10 and depression (key input) of the operation key 11 based on a change in capacitance between the detection electrodes. Thereby, the mobile phone 100 can detect the presence or absence of the operation input on the operation input surface 10.

  The X detection electrode 42 and the Y detection electrode 43 are uniformly disposed in a plane opposite to the operation input surface 10 so as to intersect each other in plan view. The X detection electrode 42 and the Y detection electrode 43 may be formed on the same plane in the detection substrate 41, or may be formed on the front surface side and the back surface side of the detection substrate 41, respectively.

  When the finger or the like of the user contacts or approaches the operation input surface 10, the capacitance between the electrodes at the intersection of the X detection electrode 42 and the Y detection electrode 43 decreases. When the operation key 11 is pressed, the convex portion 21 of the key sheet 20 is deformed to approach the electrostatic sensor 40, and the capacitance between the electrodes is increased.

  In the mobile phone 100, touch input and key input can be detected based on a change in capacitance value detected corresponding to the intersection of the X detection electrode 42 and the Y detection electrode 43.

<Block diagram>
FIG. 4 is a block diagram showing a part of the configuration of the mobile phone 100 of the present embodiment. As shown in FIG. 4, the mobile phone 100 includes a CPU 3, an electrostatic key touch controller 4, and an electrostatic sensor 40.

  The electrostatic key touch control unit 4 drives the X detection electrode 42 and the Y detection electrode 43 of the electrostatic sensor 40. Specifically, the electrostatic key touch control unit 4 applies a pulsed voltage to the Y detection electrode 43, and reads a detection value corresponding to the capacitance between the electrodes from the X detection electrode 42.

  The electrostatic key touch control unit 4 includes an input determination unit 5 (input determination device). The input determination unit 5 determines the presence or absence of the touch input and the key input based on the difference between the value of the detection value read out from the electrostatic sensor 40 (count value of the electrostatic sensor 40) and the touch threshold and the key threshold. . Specifically, when the count value (sensor input value) exceeds the touch threshold value, the input determination unit 5 determines that the touch input has been performed on a portion of the operation input surface 10 that corresponds to the count value. When the count value corresponding to the arrangement position of the operation key exceeds the key threshold, it is determined that the key input has been performed on the operation key.

  In the mobile phone 100 of the present embodiment, the count value increases when touch input is performed on the operation input surface 10, and the count value decreases when key input is performed on the operation input surface 10. It shall be.

  The CPU 3 controls the operation of the electrostatic key touch control unit 4 and performs predetermined processing according to the touch input operation and the key input operation detected by the electrostatic key touch control unit 4.

  Further, the input determination unit 5 of the electrostatic key touch control unit 4 includes the calibration unit 6, and the calibration unit 6 calibrates the sensor sensitivity at a predetermined timing to update the touch threshold and the key threshold. .

<Calculation of average value>
Hereinafter, a method of updating the reference value in the input determination unit 5 of the mobile phone 100 according to the present embodiment will be described.

  When updating the reference value, the input determination unit 5 calculates an average value of the count values not exceeding the input threshold (touch threshold and key threshold) among the count values corresponding to all the electrode intersections, and is calculated. Update the reference value based on the average value. The details will be described below.

  The input determination unit 5 calculates an average value of count values not exceeding the input threshold (touch threshold and key threshold) among the count values corresponding to all the electrode intersections, for example, in a cycle of 15 ms. Thereby, the average value of the count value on the operation input surface 10 is obtained.

The average value may be a moving average value. In this case, the moving average value New_Ave is expressed by the following equation using the past moving average value Old_Ave calculated in the past and the average value Ave of the count values calculated most recently.
New_Ave = (15/16) × Old_Ave + (1/16) × Ave
As shown in the above equation, the moving average value New_Ave is calculated as a value obtained by weighting the past moving average value Old_Ave and the average value Ave of the count values calculated most recently by a ratio of 15: 1.

  The above equation is an example, and the ratio of weighting of the past moving average value Old_Ave and the average value Ave when calculating the moving average value New_Ave is not limited to this.

  The input determination unit 5 of the mobile phone 100 according to the present embodiment updates the reference value based on the moving average value New_Ave of the count value on the operation input surface 10 calculated by the above equation.

<Flow of reference value update>
FIG. 5 is a flowchart showing an update process (a calibration process, an input threshold calibration method) of updating the reference value in the input determination unit of the present embodiment in the order of processes.

  As shown in FIG. 5, in the update process of the present embodiment, the input determination unit 5 determines the presence or absence of touch input (step 1).

  If a touch input is detected in step 1, variables are initialized (step 2). Specifically, an average value (average reference value: Stored) of reference values at each electrode intersection set in the past, a moving average value New_Ave, and a past moving average value Old_Ave are initialized (reset).

  Thereafter, the input determination unit 5 again determines the presence or absence of touch input (step 3).

  When a touch input is detected in step 3, the input determination unit 5 calculates the moving average value New_Ave of count values not exceeding the input threshold among the count values corresponding to all the electrode intersections, for example, in a cycle of 15 ms. (Step 4).

  Next, the input determination unit 5 compares the average reference value Stored with the moving average value New_Ave calculated in step 4 in a predetermined cycle, but determines whether it is the timing to make the above comparison ( Step 5). If it is determined in step 5 that the comparison timing is not reached (NO in step 5), the process returns to step 3.

  Although the input determination unit 5 of this embodiment compares the average reference value Stored with the moving average value New_Ave in a cycle of 1 second as a comparison cycle, the comparison cycle is not limited, and may be, for example, a 0.5 second cycle. And may have a period of 10 seconds. Note that, in an environment where the temperature change is large, the update period of the reference value may be shortened by shortening the comparison period in order to more reliably prevent an erroneous determination of the input operation due to the temperature change. In addition, in an environment where the temperature change is small, in order to reduce power consumption, the reference period may be extended by extending the comparison period.

  When it is determined in step 5 that the comparison timing is reached (YES in step 5), the input determination unit 5 determines whether the difference value obtained by subtracting the average reference value Stored from the moving average value New_Ave exceeds the update threshold. Determine (step 6). The update threshold is a threshold for determining whether to update the reference value, and can be set as appropriate. If the difference value does not exceed the update threshold (NO in step 6), the process returns to step 3.

  When it is determined in step 5 that the difference value exceeds the update threshold (YES in step 6), the input determination unit 5 sets the difference value to a reference value corresponding to each electrode intersection. (Step 7). Also, the average reference value Stored is updated with the value of the moving average value New_Ave.

  As described above, the input determination unit 5 calculates the average value of the count values not exceeding the input threshold among the count values corresponding to all the electrode intersections, and subtracts the average reference value Stored from the moving average value New_Ave. Updates the reference value based on the calculated average value when the value exceeds the update threshold.

  When the reference value updated in step 7 is updated beyond a predetermined range centered on the target value, the sensor sensitivity is calibrated.

<Touch input>
FIG. 6 is a diagram showing the relationship between the count value corresponding to each electrode and the touch threshold, where (a) shows the count value exceeding the touch threshold due to touch input, and (b) shows the ambient temperature Indicates a state in which the count value increases with the decrease of.

  In FIG. 6, the count value obtained for each electrode intersection lined along one direction is shown.

  In (a) of FIG. 6, the reference value (LTA) is a value set to be the same value as the count value in the state where the input operation is not performed on the operation input surface 10, and the touch threshold is set to the reference value. It is set as a value obtained by adding the value of the size of. That is, when the difference between the count value and the reference value exceeds the predetermined size (when the count value exceeds the touch threshold), the input determination unit 5 determines that the touch input is performed on the operation input surface 10 .

  As shown in (a) of FIG. 6, when a human finger approaches the operation input surface 10 of the mobile phone 100, the count value corresponding to the electrode intersection immediately below the proximity increases. When the count value exceeds the touch threshold, the input determination unit 5 determines that the finger of a person approaches the position on the electrode intersection where the count value is detected.

  As shown in (b) of FIG. 6, when the temperature around the electrostatic sensor 40 fluctuates, the electrostatic capacitance between the electrodes fluctuates, and the corresponding count value between the electrodes fluctuates.

  The input determination unit 5 of this embodiment calculates and calculates a moving average value of count values not exceeding the input threshold among count values corresponding to all the electrode intersections regardless of whether or not touch input is performed. Update the reference value based on the moving average value. Thereby, the input threshold (touch threshold and key threshold) is updated.

  Therefore, even when the touch input state continues, if the temperature around the electrostatic sensor 40 decreases and the corresponding count value between the plurality of electrodes increases, as shown in FIG. Thus, the reference value is increased to follow the increase in the count value due to the temperature decrease. By increasing the reference value, the touch threshold also increases.

  Thus, even if there is a temperature change while the touch input state continues, it is erroneously determined that a touch input is made to a region not touched by the operator of the mobile phone 100 under the influence of the temperature change. Can be prevented.

  Further, when the reference value is updated beyond the predetermined range, the input determination unit 5 calibrates the sensor sensitivity. Specifically, when the reference value is updated beyond a predetermined range centered on the target value, the sensor sensitivity is calibrated and the reference value is adjusted to the target value.

<Key input>
FIG. 7 is a cross-sectional view of the mobile phone when key input is performed on the operation input surface.

  FIG. 8 is a diagram showing the relationship between the count value corresponding to each electrode and the key threshold value.

  Note that in FIG. 7, the key sheet 20 and the insulating substrate 30 described with reference to FIG. 2 are omitted in FIG. 7.

  As shown in FIG. 7, when the key of the operation input surface 10 is pressed, the overlay 12 is deformed (or the operation key 11 is retracted) in the pressed area 10A.

  At this time, as shown in FIG. 8, the count value corresponding to the electrode crossing portion immediately below the depressed region 10A decreases. Then, when the count value corresponding to the electrode intersection part immediately below the pressed area 10A exceeds the key threshold, the input determining unit 5 determines that the key input is performed in the pressed area 10A.

  As described above, when updating the reference value, the input determination unit 5 calculates an average value of the count values not exceeding the input threshold among the count values corresponding to all the electrode intersections, and calculates the average value Update the reference value based on. By this, even if there is a temperature change, it is possible to prevent an erroneous determination that a key input has been made to a region where the operator of the mobile phone 100 has not made a key input under the influence of the temperature change. Can.

  Here, as shown in FIG. 7, when the key of the operation input surface 10 is depressed, the overlay 12 is deformed in the peripheral area 10B of the depressed area 10A together with the depressed area 10A, and the count value corresponding to the peripheral area 10B. Also decreases. However, since the count value corresponding to the peripheral area 10B does not exceed the key threshold, no key input operation is detected at the position coordinates of the electrode intersection portion immediately below the peripheral area 10B.

  FIG. 9 is a diagram showing an example of the relationship between the count value corresponding to each electrode and the key threshold value.

  FIG. 9 shows the relationship between the count value and the key threshold value corresponding to the electrode intersection part immediately below the peripheral region 10B in FIG.

  By pressing the pressed area 10A, as shown in FIG. 9, the count value corresponding to the peripheral area 10B also decreases. When the reference value corresponding to the surrounding area 10B is updated based on the decreased count value, the reference value corresponding to the surrounding area 10B decreases. As a result, the reference value is updated beyond a predetermined range centered on the target value, and the sensor sensitivity is unintentionally calibrated. Thus, when the sensor sensitivity is calibrated according to the local reference value fluctuation in the peripheral area 10B, after calibration, the peripheral area 10B becomes an insensitive area, and the presence or absence of the touch input and the key input becomes normal. It can not be determined.

  On the other hand, since the input determination unit 5 of the mobile phone 100 according to the present embodiment updates the reference value based on the average value of the count values not exceeding the input threshold among the count values corresponding to the respective electrode intersections, Even when the count value corresponding to the peripheral area 10B decreases without exceeding the key threshold value, the influence of the reduction of the local count value in the peripheral area 10B in the increase or decrease of the reference value when updating the reference value Is relaxed to a negligible extent.

  Therefore, compared to the updating method of updating the reference value corresponding to the peripheral area 10B based on the count value corresponding to the peripheral area 10B, the fluctuation of the reference value can be suppressed before and after the updating.

  As a result, it is possible to prevent a large fluctuation of the reference value due to the influence of the change of the local count value and an unintended calibration of the sensor sensitivity.

Second Embodiment
Another embodiment of the present invention is described below with reference to FIG. In addition, about the member which has the same function as the member demonstrated in the said embodiment for convenience of explanation, the same code | symbol is appended and the description is abbreviate | omitted.

  FIG. 10 is a diagram showing a schematic configuration of the smartphone according to the present embodiment, (a) is a plan view, and (b) is a cross-sectional view.

  As shown in (a) of FIG. 10, the input determination unit according to the present invention detects only the touch input of the key input and the touch input, and performs the predetermined processing according to the touch input operation. Can also be applied.

  In the smartphone 200, an input unit 201 having an operation input surface and a display unit 202 for displaying an image or the like are integrated.

  As shown in (b) of FIG. 10, in the smartphone 200, the overlay 212 and the electrostatic sensor 40 are provided to face each other, and the upper surface of the overlay 212 constitutes the operation input surface 10.

  Moreover, although illustration is abbreviate | omitted, the smart phone 200 is provided with the input determination part 5 demonstrated in Embodiment 1. FIG.

  As described above, the smartphone 200 capable of detecting only the touch input is also provided with the input determination unit, so that as described with reference to FIG. When the temperature around the sensor 40 decreases and the corresponding count value increases between the plurality of electrodes, as shown in FIG. 6B, the reference value and the touch are increased according to the increase in the count value due to the temperature decrease. Increase the threshold.

  Thus, it is possible to prevent an erroneous determination that a touch input has been made on a region not touched by the operator of the smartphone 200.

  In the first embodiment, the mobile phone 100 is described as an example of the electronic device of the present invention, and in the second embodiment, the smartphone 200 is described as an example. However, these are merely examples, and the electronic device of the present invention includes electronic devices that are not portable, and detects key input and touch input, for example, and performs predetermined processing according to key input operation and touch input operation. Also includes a keyboard.

[Example of software implementation]
The control block (particularly the input determination unit 5) of the mobile phone 100 and the smartphone 200 may be realized by a logic circuit (hardware) formed in an integrated circuit (IC chip) or the like, or a CPU (Central Processing Unit). It may be realized by software.

  In the latter case, the mobile phone 100 and the smartphone 200 are a CPU that executes instructions of a program that is software that implements each function, and a ROM (Read Only) in which the program and various data are readably recorded by a computer (or CPU). Memory or storage device (these are referred to as "recording media"), and RAM (Random Access Memory) for developing the program. The object of the present invention is achieved by the computer (or CPU) reading the program from the recording medium and executing the program. As the recording medium, a “non-transitory tangible medium”, for example, a tape, a disk, a card, a semiconductor memory, a programmable logic circuit or the like can be used. The program may be supplied to the computer via any transmission medium (communication network, broadcast wave, etc.) capable of transmitting the program. The present invention can also be realized in the form of a data signal embedded in a carrier wave, in which the program is embodied by electronic transmission.

[Summary]
The input determination device (input determination unit 5) according to aspect 1 of the present invention detects a plurality of sensor input values (count values) corresponding to a plurality of locations on the operation input surface (10), and It is an input judging device which judges the existence of input operation to the above-mentioned operation input side based on the difference with an input threshold, and it calibrates sensor sensitivity at a predetermined timing, and a calibration part (6) which updates the input threshold The calibration unit calibrates the sensor sensitivity based on an average value of the sensor input values not exceeding the input threshold among the plurality of sensor input values.

  According to the above configuration, since the sensor sensitivity is calibrated based on the average value of the sensor input values that do not exceed the input threshold value, it is possible to perform calibration in which the influence of changes in local sensor input values is mitigated. As a result, it is possible to suppress the erroneous determination of the input operation due to the large fluctuation of the input threshold.

  The input determination device according to aspect 2 of the present invention is the input determination device according to aspect 1 that determines the presence or absence of a touch input to the operation input surface based on the difference between the sensor input value and the touch threshold, The calibration unit may be configured to update the touch threshold by calibrating the sensor sensitivity based on an average value of the sensor input values not exceeding the touch threshold among the plurality of sensor input values. Good.

  According to the above configuration, when calculating the average value of the sensor input values, the environment such as temperature change is not performed even when the touch input operation is being performed by not including the sensor input values that are fluctuated by the touch input. The sensor sensitivity may be calibrated and the touch threshold updated in response to the change in.

  The input determination device according to aspect 3 of the present invention includes the key (operation key 11) on the operation input surface in the above aspect 1 or 2, and the sensor input value and key threshold value corresponding to the location of the key And the calibration unit is configured to determine, among the plurality of sensor input values, the sensor input value which does not exceed the key threshold value. The key threshold may be updated by calibrating the sensor sensitivity based on the average value.

  According to the above configuration, when calculating the average value of the sensor input value, the environment such as temperature change can be performed even during a key input operation period by not including the sensor input value changed by the key input. The sensor sensitivity may be calibrated to update the key threshold according to the change of.

  Furthermore, since the sensor sensitivity is calibrated based on the average value of the sensor input values, the calibration can be performed while alleviating the influence of changes in the sensor input values around the pressed key. As a result, it is possible to suppress an erroneous determination of key input due to a significant change of the key threshold.

  The electronic device (mobile phone 100 / smart phone 200) according to aspect 5 of the present invention detects the sensor input value from the plurality of sensor electrodes (X detection electrode 42 / Y detection electrode 43) and the sensor electrode, and performs the above operation The input determination device according to any one of the above aspects 1 to 3, which determines the presence or absence of the input operation on the input surface.

  An input threshold calibration method of an input determination device according to a sixth aspect of the present invention detects a plurality of sensor input values corresponding to a plurality of locations on the operation input surface, and based on the difference between the sensor input value and the input threshold, An input threshold calibration method of an input determination device that determines the presence or absence of an input operation on the operation input surface, including a calibration step of updating the input threshold by calibrating sensor sensitivity at a predetermined timing, the calibration step In the above, the sensor sensitivity is calibrated based on an average value of the sensor input values not exceeding the input threshold among the plurality of sensor input values.

  The input determination device according to each aspect of the present invention may be realized by a computer. In this case, the computer is operated as each unit (software element) included in the input determination device to cause the computer to execute the input determination device. A control program of an input determination device to be realized and a computer readable recording medium recording the same also fall within the scope of the present invention.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims, and embodiments obtained by appropriately combining the technical means disclosed in the different embodiments. Is also included in the technical scope of the present invention. Furthermore, new technical features can be formed by combining the technical means disclosed in each embodiment.

5 Input judgment unit (input judgment device)
6 Calibration section 10 Operation input surface 11 Operation key (key)
42 X detection electrode (sensor electrode)
43 Y detection electrode (sensor electrode)
100 Mobile Phone (Electronic Equipment)
200 Smartphone (Electronic Device)

Claims (6)

The input determination device detects a plurality of sensor input values corresponding to a plurality of locations on the operation input surface, and determines the presence or absence of an input operation on the operation input surface based on the difference between the sensor input value and the input threshold. ,
The calibration unit is provided to update the input threshold by calibrating the sensor sensitivity at a predetermined timing.
The calibration unit updates a reference value serving as a reference for setting the input threshold based on an average value of the sensor input values not exceeding the input threshold among the plurality of sensor input values, and further, the reference value An input determination device that calibrates the sensor sensitivity when the value is updated beyond a predetermined range. The input threshold is a touch threshold,
An input determination device that determines the presence or absence of a touch input on the operation input surface based on the difference between the sensor input value and the touch threshold,
The calibration unit updates the touch threshold by calibrating the sensor sensitivity based on an average value of the sensor input values not exceeding the touch threshold among the plurality of sensor input values. The input determination device according to claim 1. The input threshold is a key threshold,
The input determination device includes a key on the operation input surface, and determines presence or absence of key input on the operation input surface based on a difference between the sensor input value corresponding to the arrangement position of the key and the key threshold value. ,
The calibration unit updates the key threshold by calibrating the sensor sensitivity based on an average value of the sensor input values not exceeding the key threshold among the plurality of sensor input values. The input determination device according to claim 1. A control program for causing a computer to function as a calibration unit in the input determination device according to any one of claims 1 to 3 . With multiple sensor electrodes,
The input determination apparatus according to any one of claims 1 to 3, which detects the sensor input value from the sensor electrode and determines the presence or absence of an input operation on the operation input surface. machine. An input determination device that detects a plurality of sensor input values corresponding to a plurality of locations on the operation input surface and determines the presence or absence of an input operation on the operation input surface based on the difference between the sensor input value and the input threshold Threshold calibration method, and
Including a calibration step of updating the input threshold by calibrating the sensor sensitivity at a predetermined timing;
In the calibration step, a reference value serving as a reference for setting the input threshold is updated based on an average value of the sensor input values not exceeding the input threshold among the plurality of sensor input values, and the reference value is further added. Is calibrated beyond the predetermined range, the sensor sensitivity is calibrated.

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