JP2017010455A - Input determination device, control program, electronic apparatus, and calibration method of input threshold level for input determination device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an input determination device capable of reducing erroneous judgment of input operation due to a large fluctuation of input threshold level by carrying out calibration.SOLUTION: The input determination device includes a calibration section (6) that updates an input threshold level by calibrating the sensor sensitivity at predetermined timing. The calibration section (6) calibrates the sensor sensitivity based on an average value of the sensor input values within the input threshold level from the plural sensor input values.SELECTED DRAWING: Figure 4

Description

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

  An electronic device such as a smartphone includes an input determination device that determines whether or not a touch input operation is performed on the touch panel, and executes processing according to the touch input operation. The input determination device determines that an input operation by touch is performed on the operation input surface when a sensor input value detected via an electrostatic sensor provided on the touch panel exceeds a touch threshold value.

  However, the sensor input value obtained from the electrostatic sensor changes under the influence of 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 a change in sensor input value based on a temperature change, thereby preventing erroneous determination due to the influence of temperature.

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

Japanese Patent Laying-Open No. 2015-11558 (published January 19, 2015)

  However, the control device for the touch panel in Patent Document 1 calculates a difference between a sensor input value and a predetermined reference value for each sensor, and updates a 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 changed, and the detection accuracy and stability of the input operation are lowered.

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

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

  In order to solve the above problem, an input determination device according to an aspect of the present invention detects a plurality of sensor input values corresponding to a plurality of locations on an operation input surface, and calculates the sensor input value and the input threshold value. An input determination device that determines the presence or absence of an input operation on the operation input surface based on a difference, and includes a calibration unit that updates the input threshold by calibrating sensor sensitivity at a predetermined timing. The unit calibrates the sensor sensitivity based on an average value of the sensor input values not exceeding the input threshold value among the plurality of sensor input values.

  In order to solve the above problems, an input threshold value calibration method for an input determination device according to an aspect of the present invention detects a plurality of sensor input values corresponding to a plurality of locations on an operation input surface, and An input threshold value calibration method for an input determination device for determining 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 value, wherein the input threshold value is obtained by calibrating sensor sensitivity at a predetermined timing. The calibration step includes calibrating the sensor sensitivity based on an average value of the sensor input values that do not exceed the input threshold value among the plurality of sensor input values. To do.

  According to one embodiment of the present invention, it is possible to suppress erroneous determination of an input operation due to a significant variation in 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 | seat, (c) is an insulated 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 insulated substrate, (d) is electrostatic It is a sensor. It is a block diagram which shows a part of structure of the mobile telephone which concerns on Embodiment 1 of this 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 process order. It is a figure which shows the relationship between the count value corresponding between each electrode, and a touch threshold value, (a) shows the state where the count value exceeded the touch threshold value by touch input, (b) is with the fall of ambient temperature. Indicates that the count value is increasing. It is sectional drawing of a mobile telephone when a key input is performed on the operation input surface. It is a figure which shows the relationship between the count value corresponding between each electrode, and a key threshold value. It is a figure which shows an example of the relationship between the count value corresponding between each electrode, and a key threshold value. 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 apparatus according to the first embodiment of the present invention will be described in detail with reference to FIGS. In the following description, a mobile phone will be described as an example of an electronic device.

<Mobile phone>
FIG. 1 is a plan view showing a schematic configuration of the mobile phone according to the present embodiment. A cellular phone 100 (electronic device) includes an input unit 1 having an operation input surface 10 on which an operation by a user can be input, and a display unit 2 that displays an image or the like. An operation key 11 (key) is arranged 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 process.

  FIG. 2 is a plan view showing the configuration of the input unit 1. FIG. 2A is an overlay and operation keys, FIG. 2B is a key sheet, FIG. 2C is an insulating substrate, and FIG. It is an electric sensor.

  3 is a cross-sectional view showing the positional relationship of each component of the input unit 1, (a) is an overlay and operation keys, (b) is a key sheet, (c) is an insulating substrate, d) is an electrostatic sensor.

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

<Operation input screen>
As shown in FIG. 2A, an overlay 12 is provided on the surface side of the input unit 1, and the operation keys 11 are exposed on the surface of the input unit 1 from an opening formed in the overlay 12. . The surface of the overlay 12 and the surface of the operation keys 11 constitute an operation input surface 10. As shown in FIG. 3A, the operation key 11 has a protruding portion 13 protruding on the back side.

<Key sheet>
As shown in FIG. 3B, 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 has a dome-shaped convex portion 21 at a position corresponding to the operation key 11 (directly below the operation key 11). The convex portion 21 is made of a conductive material. The convex portion 21 has flexibility, and is deformed by receiving pressure when the operation key 11 is pressed.

<Insulating layer>
As shown in FIG. 3C, 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 FIG. 3D, an electrostatic sensor 40 is provided on the back side of the insulating substrate 30. As shown in FIG. 2D, 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 detecting the proximity or contact (touch input) of an object to the operation input surface 10 and pressing of the operation key 11 (key input) based on a change in capacitance between the detection electrodes. Thereby, the mobile phone 100 can detect the presence / absence of an operation input on the operation input surface 10.

  The X detection electrode 42 and the Y detection electrode 43 are uniformly arranged in a plane facing 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 of 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 a user's finger or the like touches or approaches the operation input surface 10, the capacitance between the electrodes at the location where the X detection electrode 42 and the Y detection electrode 43 intersect with each other decreases. When the operation key 11 is pressed, the convex portion 21 of the key sheet 20 is deformed and approaches the electrostatic sensor 40, and the capacitance between the electrodes increases.

  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 control unit 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 pulse 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 / absence of touch input and key input based on the difference between the detection value read from the electrostatic sensor 40 (count value of the electrostatic sensor 40) and the touch threshold and key threshold. . Specifically, when the count value (sensor input value) exceeds the touch threshold value, the input determination unit 5 determines that a touch input has been made to a location corresponding to the count value on the operation input surface 10. When the count value corresponding to the operation key arrangement location exceeds the key threshold value, it is determined that the key is input to the operation key.

  In the mobile phone 100 of the present embodiment, the count value increases when a touch input is made on the operation input surface 10, and the count value decreases when a key input is made on the operation input surface 10. Shall.

  The CPU 3 controls the operation of the electrostatic key / touch control unit 4 and performs a touch input operation detected by the electrostatic key / touch control unit 4 and a predetermined process corresponding to the key input operation.

  The input determination unit 5 of the electrostatic key / touch control unit 4 includes a 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 reference value updating method in the input determination unit 5 of the mobile phone 100 of the present embodiment will be described.

  When updating the reference value, the input determination unit 5 calculates the average value of the count values that do not exceed the input threshold values (touch threshold value and key threshold value) among the count values corresponding to all the electrode intersections, and is calculated The reference value is updated based on the average value. This will be specifically described below.

  The input determination unit 5 calculates an average value of count values that do not exceed the input threshold values (touch threshold value and key threshold value) among the count values corresponding to all electrode intersections, for example, in a cycle of 15 milliseconds. Thereby, the average value of the count values 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 expression 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 most recently calculated count values by a ratio of 15: 1.

  The above formula is an example, and the weighting ratio 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 formula.

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

  As shown in FIG. 5, in the update process of this embodiment, the input determination part 5 determines the presence or absence of a 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 whether or not there is a touch input (step 3).

  When a touch input is detected in step 3, the input determination unit 5 calculates a moving average value New_Ave of count values that do not exceed the input threshold value among count values corresponding to all electrode intersections, for example, in a cycle of 15 milliseconds. (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, and determines whether it is the timing of the above comparison ( Step 5). If it is determined in step 5 that it is not the comparison timing (NO in step 5), the process returns to step 3.

  The input determination unit 5 of the present embodiment compares the average reference value Stored and the moving average value New_Ave with a period of 1 second as a comparison period, but the comparison period is not limited, and may be, for example, a 0.5 second period. And a 10 second period may be sufficient. Note that, in an environment where the temperature change is large, the reference value update period may be shortened by shortening the comparison period in order to more reliably prevent erroneous determination of the input operation due to the temperature change. Further, in an environment where the temperature change is small, the reference value update period may be lengthened by lengthening the comparison period in order to reduce power consumption.

  When it is determined in step 5 that the comparison timing is reached (YES in step 5), the input determination unit 5 determines whether or not the difference value obtained by subtracting the average reference value Stored from the moving average value New_Ave exceeds the update threshold value. Judgment is made (step 6). The update threshold is a threshold for determining whether or not to update the reference value, and can be set as appropriate. When the difference value does not exceed the update threshold value (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 value (YES in step 6), the input determination unit 5 uses the difference value as a reference value set corresponding to each electrode intersection. (Step 7). Further, 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 that do not exceed the input threshold value among the count values corresponding to all the electrode intersections, and subtracts the average reference value Stored from the moving average value New_Ave. When the value exceeds the update threshold, the reference value is updated based on the calculated average value.

  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>
6A and 6B are diagrams showing the relationship between the count value corresponding to each electrode and the touch threshold value, where FIG. 6A shows a state where the count value exceeds the touch threshold value by touch input, and FIG. 6B shows the ambient temperature. This shows a state in which the count value increases with a decrease in.

  FIG. 6 shows the count value obtained for each electrode crossing portion arranged along one direction.

  In FIG. 6A, the reference value (LTA) is a value set to be the same value as the count value when no operation is 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. That is, the input determination unit 5 determines that a touch input has been made on the operation input surface 10 when the difference between the count value and the reference value exceeds the predetermined magnitude (when the count value exceeds the touch threshold). .

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

  As shown in FIG. 6B, when the temperature around the electrostatic sensor 40 varies, the capacitance between the electrodes varies, and the corresponding count value varies between the electrodes.

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

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

  Thereby, even when there is a temperature change while the touch input state continues, it is erroneously determined that a touch input has been made to an area that is not touched by the operator of the mobile phone 100 due to the influence of the temperature change. Can be prevented.

  Further, the input determination unit 5 calibrates the sensor sensitivity when the reference value is updated beyond a predetermined range. 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 a key is input on the operation input screen.

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

  For the sake of explanation, in FIG. 7, the key sheet 20 and the insulating substrate 30 described with reference to FIG. 2 are not shown.

  As shown in FIG. 7, when a key on 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 intersection immediately below the pressed area 10A decreases. Then, when the count value corresponding to the electrode intersection immediately below the pressed area 10A exceeds the key threshold, the input determining unit 5 determines that a key input has been made in the pressed area 10A.

  As described above, when the input determination unit 5 updates the reference value, the input determination unit 5 calculates the average value of the count values that do not exceed the input threshold among the count values corresponding to all the electrode intersections, and calculates the calculated average value. The reference value is updated based on Thereby, even when there is a temperature change, it is possible to prevent erroneous determination that a key input has been made to an area where the operator of the mobile phone 100 has not input a key due to the influence of the temperature change. Can do.

  Here, as shown in FIG. 7, when the key on the operation input surface 10 is pressed, the overlay 12 is deformed in the peripheral area 10B of the pressed area 10A together with the pressed area 10A, thereby the count value corresponding to the peripheral area 10B. Also decreases. However, since the count value corresponding to the peripheral region 10B does not exceed the key threshold value, the key input operation is not detected in the position coordinates of the electrode intersection immediately below the peripheral region 10B.

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

  FIG. 9 shows the relationship between the count value corresponding to the electrode intersection immediately below the peripheral region 10B in FIG. 7 and the key threshold value.

  By pressing the pressed area 10A, the count value corresponding to the peripheral area 10B is also decreased as shown in FIG. When the reference value corresponding to the peripheral area 10B is updated based on the decreased count value, the reference value corresponding to the peripheral 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. As described above, when the sensor sensitivity is calibrated according to the local reference value variation in the peripheral area 10B, the peripheral area 10B becomes a non-sensitive area after calibration, and the presence or absence of touch input and key input is normally set. It becomes impossible to judge.

  On the other hand, 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 that do not exceed the input threshold among the count values corresponding to each electrode intersection. Even when the count value corresponding to the peripheral area 10B decreases without exceeding the key threshold value, the influence of the local count value decrease in the peripheral area 10B in the increase / decrease width of the reference value when the reference value is updated. Is relaxed to a negligible level.

  For this reason, fluctuations in the reference value before and after the update can be suppressed as compared with the update method in which the reference value corresponding to the peripheral region 10B is updated based on the count value corresponding to the peripheral region 10B.

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

[Embodiment 2]
The following will describe another embodiment of the present invention with reference to FIG. For convenience of explanation, members having the same functions as those described in the embodiment are given the same reference numerals, and descriptions thereof are omitted.

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

  As illustrated in FIG. 10A, the input determination unit according to the present invention detects only a touch input from the key input and the touch input, and performs a predetermined process according to the touch input operation (electronic device). ).

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

  As shown in FIG. 10B, the smartphone 200 is provided such that the overlay 212 and the electrostatic sensor 40 face each other, and the upper surface of the overlay 212 forms 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 also includes the input determination unit, so that even if the touch input is performed as described with reference to FIG. When the temperature around the sensor 40 decreases and the count value corresponding to the plurality of electrodes increases, 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.

  Thereby, it can prevent misjudging that the touch input was made with respect to the area | region which the operator of the smart phone 200 is not touching.

  In addition, as the electronic device of the present invention, the mobile phone 100 is described as an example in the first embodiment, and the smartphone 200 is described as an example in the second embodiment. However, these are merely examples, and the electronic device of the present invention includes electronic devices that are not portable. For example, key input and touch input are detected, and predetermined processing corresponding to the key input operation and touch input operation is performed. A keyboard is also included.

[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) And may be realized by software.

  In the latter case, the mobile phone 100 and the smartphone 200 include a CPU that executes instructions of a program that is software that realizes each function, and a ROM (Read Only) in which the program and various data are recorded so as to be readable by the computer (or CPU). Memory) or a storage device (these are referred to as “recording media”), a RAM (Random Access Memory) for expanding the program, and the like. And the objective of this invention is achieved when a computer (or CPU) reads the said program from the said recording medium and runs it. As the recording medium, a “non-temporary tangible medium” such as 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 an arbitrary transmission medium (such as a communication network or a broadcast wave) that can transmit 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 A calibration unit (6) that is an input determination device that determines the presence or absence of an input operation on the operation input surface based on a difference from an input threshold, and updates the input threshold by calibrating sensor sensitivity at a predetermined timing. The calibration unit calibrates the sensor sensitivity based on an average value of the sensor input values not exceeding the input threshold value 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 that mitigates the influence of a local change in the sensor input value. Thereby, the erroneous determination of the input operation due to a large fluctuation of the input threshold can be suppressed.

  The input determination apparatus according to aspect 2 of the present invention is the input determination apparatus according to aspect 1, wherein the input determination apparatus determines whether or not there is a touch input on the operation input surface based on a 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, by not including the sensor input value that has fluctuated due to the touch input, the environment such as a temperature change can be obtained even during the period of the touch input operation. It is possible to update the touch threshold by calibrating the sensor sensitivity according to the change of the touch.

  The input determination device according to aspect 3 of the present invention is the above-described aspect 1 or 2, wherein the operation input surface includes a key (operation key 11), and the sensor input value and key threshold value corresponding to the location of the key. An input determination device that determines whether or not there is a key input to the operation input surface based on a difference between the sensor input value and the sensor input value that does not exceed the key threshold value among the plurality of sensor input values. 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 values, by not including the sensor input value that has fluctuated due to the key input, the environment such as a temperature change can be obtained even during the key input operation period. The key sensitivity can be updated by calibrating the sensor sensitivity in accordance with the change in.

  Furthermore, since the sensor sensitivity is calibrated based on the average value of the sensor input values, it is possible to perform the calibration by reducing the influence of the change in the sensor input value around the pressed key. Thereby, it is possible to suppress erroneous determination of key input due to a significant change in the key threshold.

  The electronic device (mobile phone 100 / smart phone 200) according to the fifth aspect 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 that determines the presence or absence of an input operation on the input surface.

  The input threshold value calibration method of the input determination device according to the aspect 6 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 value, An input threshold value calibration method for an input determination device for determining the presence or absence of an input operation on the operation input surface, including a calibration step of updating the input threshold value by calibrating sensor sensitivity at a predetermined timing, the calibration step Then, the sensor sensitivity is calibrated based on an average value of the sensor input values not exceeding the input threshold value 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 input determination device is operated on each computer by causing the computer to operate as each unit (software element) included in the input determination device. Also included in the scope of the present invention are a control program for the input determination device to be realized and a computer-readable recording medium on which the control program is recorded.

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

5 Input determination unit (input determination device)
6 Calibration section 10 Operation input screen 11 Operation keys (keys)
42 X detection electrode (sensor electrode)
43 Y detection electrode (sensor electrode)
100 Mobile phone (electronic equipment)
200 Smartphone (electronic equipment)

Claims (6)

An input determination device that detects a plurality of sensor input values corresponding to a plurality of locations on an operation input surface, and determines the presence or absence of an input operation on the operation input surface based on a difference between the sensor input value and an input threshold value. And
A calibration unit that updates the input threshold value by calibrating the sensor sensitivity at a predetermined timing;
The input determination device, wherein the calibration unit calibrates the sensor sensitivity based on an average value of the sensor input values that does not exceed the input threshold value among the plurality of sensor input values. An input determination device that determines presence or absence of touch input on the operation input surface based on a difference between the sensor input value and a 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. An input determination device that includes a key on the operation input surface, and that determines whether or not there is a key input to the operation input surface based on a difference between the sensor input value corresponding to the location of the key and a key threshold value. ,
The calibration unit updates the key threshold value by calibrating the sensor sensitivity based on an average value of the sensor input values not exceeding the key threshold value among the plurality of sensor input values. The input determination device according to claim 1 or 2.   The control program for functioning a computer as a calibration part in the input determination apparatus of any one of Claims 1-3. A plurality of sensor electrodes;
The input determination apparatus according to claim 1, further comprising: an input determination device according to claim 1 that detects the sensor input value from the sensor electrode and determines whether or not there is an input operation on the operation input surface. machine. Input of 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 whether or not there is an input operation on the operation input surface based on a difference between the sensor input value and an input threshold value A threshold calibration method,
Including a calibration step of updating the input threshold by calibrating the sensor sensitivity at a predetermined timing;
In the calibration step, the sensor sensitivity is calibrated based on an average value of the sensor input values that does not exceed the input threshold value among the plurality of sensor input values, and the input threshold value calibration of the input determination device is characterized in that Method.

Images