JP2017010104A - Touch panel device, control method therefor and control program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To securely prevent wrong detection on multiple touches due to change in inter-terminal resistance value caused by temperature change or secular change.SOLUTION: An arithmetic processor 300 determines, based upon a single-touch threshold and a multi-touch threshold, which of a single touch one point and multiple touches on a plurality of points are made on a touch panel 100. A touch panel device has update means of measuring, as a non-touch resistance value, a resistance value of the touch panel in a non-touch state, and performing update processing for updating the single-touch threshold and the multi-touch threshold according to the non-touch resistance value and a preset resistance value when the touch panel device is actuated. When the power supply is turned on, the arithmetic processor measures, as the non-touch resistance value, the resistance value with the touch panel in the non-touch state, and updates the single-touch threshold and multi-touch threshold according to an initial non-touch resistance value and the preset thresholds.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a touch panel device, a control method thereof, and a control program, and more particularly to a calibration method in a touch panel device used in an imaging device or the like.

  In general, an intuitive operation is required in a user interface provided in an imaging apparatus such as a digital camera. For example, a touch panel device is used as a user interface. In the operation using the touch panel device, a so-called multi-touch operation for detecting two points is becoming essential. As an example of the multi-touch operation, there is an operation for enlarging or reducing an image using two fingers.

  On the other hand, there is a so-called resistive film type touch panel (hereinafter referred to as a resistive film touch panel) as one of touch panels used in the touch panel device. In the resistive touch panel, when a single touch that performs a touch operation using one finger and a multi-touch are determined, the determination is performed according to the inter-terminal resistance value.

  However, the resistance value between terminals varies due to the influence of temperature change or aging. And the situation where the detection position in the case of touch operation shifts arises by the fluctuation | variation of the resistance value between terminals.

  In order to cope with temperature change or aging change, for example, there is one in which the resistance value between terminals in the initial state is measured based on a highly accurate fixed resistance value (see Patent Document 1). Here, the current inter-terminal resistance value is measured based on the inter-terminal resistance value obtained in the initial state, and the rate of change is calculated. Then, based on the calculated change rate, the calibration value for single touch correction is updated to perform position shift correction (detected position shift correction).

JP 2001-265512 A

  As described above, if the change rate of the resistance value between the terminals is calculated, it is possible to roughly grasp the shift amount of the detection position and the shift direction of the detection position. Then, if the calibration value is updated according to the change rate of the inter-terminal resistance value, the deviation of the detection position can be reduced.

  However, in the method described in Patent Document 1 described above, only single touch is considered and multi-touch is not considered. Therefore, when multi-touch is performed, erroneous detection inevitably occurs.

  Therefore, an object of the present invention is to provide a touch panel device that can reliably prevent erroneous detection of multi-touch due to a change in resistance value between terminals due to a temperature change or a secular change, a control method thereof, and a control program. It is in.

  In order to achieve the above object, a touch panel device according to the present invention includes a touch panel whose resistance value changes according to a touch position, and accepts an operation according to a touch position when the touch operation is performed on the touch panel. , A single touch threshold used when determining whether or not a single touch for touching one point on the touch panel has been performed, and determining whether or not a multitouch for touching a plurality of points on the touch panel has been performed Determining means for determining whether the single touch or the multi-touch has been performed based on a multi-touch threshold used at the time, and the touch panel is in a non-touch state when the touch panel device is activated. If the resistance value of the touch panel is a non-touch resistance value Constant, and characterized by having a, and updating means for updating process of updating the single touch threshold and the multi-touch threshold value according the the non-touch resistance value and the preset resistance value.

  A control method according to the present invention is a control method for a touch panel device that includes a touch panel whose resistance value changes according to a touch position and receives an operation according to the touch position when the touch panel is touched. A single touch threshold used when determining whether or not a single touch for touching a point has been performed and a multi touch used for determining whether or not a multitouch for touching a plurality of points on the touch panel has been performed. A determination step of determining whether the single touch or the multi-touch is performed based on a touch threshold; and the touch panel when the touch panel is in a non-touch state when the touch panel device is activated. The resistance value is measured as a non-touch resistance value, and the non-touch value is measured. And updating step of updating the single touch threshold and the multi-touch threshold value according to the preset resistance value and anti-value, and having a.

  A control program according to the present invention is a control program used in a touch panel device that includes a touch panel whose resistance value changes according to a touch position and receives an operation according to a touch position when the touch panel is touched. A single touch threshold used when determining whether or not a single touch for touching one point on the touch panel has been performed on the computer included in the apparatus and multitouch for touching a plurality of points on the touch panel have been performed. A determination step of determining whether the single touch or the multi-touch has been performed based on a multi-touch threshold value used when determining whether or not the touch panel is activated when the touch panel device is activated. When not touched Measuring the resistance value of the touch panel as a non-touch resistance value, and updating the single touch threshold value and the multi-touch threshold value according to the non-touch resistance value and a preset resistance value. It is characterized by.

  According to the present invention, the single touch threshold value and the multi-touch threshold value are updated according to the non-touch resistance value measured after activation and the preset resistance value. Accordingly, it is possible to reliably prevent erroneous detection of multi-touch due to a change in resistance value due to a temperature change or a secular change.

It is a block diagram which shows the structure about an example of the touchscreen device by the 1st Embodiment of this invention. It is a figure for demonstrating the measurement of the resistance value between terminals in the touch panel shown in FIG. It is a flowchart for demonstrating the calculation and update of the single threshold value and multi threshold value which are performed with the touch-panel apparatus shown in FIG. It is a figure for demonstrating an example of the relationship between progress of time and resistance between terminals in the touchscreen device by a 2nd embodiment of the present invention, and (a) is a figure showing change of resistance between terminals at the time of high temperature, (B) is a figure which shows transition of the resistance value between terminals in the time of low temperature. It is a flowchart for demonstrating the calculation and update of the single threshold value and multi threshold value which are performed with the touchscreen device by the 2nd Embodiment of this invention. It is a flowchart for demonstrating the calculation and update of the single threshold value and multi threshold value which are performed with the touchscreen device by the 3rd Embodiment of this invention.

  Hereinafter, an example of a touch panel device according to an embodiment of the present invention will be described with reference to the drawings.

[First Embodiment]
FIG. 1 is a block diagram showing the configuration of an example of a touch panel device according to the first embodiment of the present invention.

  The illustrated touch panel device includes a touch panel 100, and a resistive film touch panel is used as the touch panel 100. Furthermore, the touch panel device includes an LCD panel 200, a recording device 400, and an arithmetic processing device 300.

  The arithmetic processing device 300 controls the operation of a content management device (not shown) for managing content such as images. The arithmetic processing device 300 receives instructions from the user via the touch panel 100 and executes various programs described later to control the LCD panel 200.

  The recording device 400 is used as, for example, a work area of the arithmetic processing device 300, and the recording device 400 includes an initial value recording unit and a threshold value recording unit (both not shown). In addition, the touch panel 100 is provided with an inter-terminal resistance measurement unit 100a for measuring the inter-terminal resistance value.

  The initial value recording unit records non-touch, single touch, and multi-touch inter-terminal resistance values in the initial state. Hereinafter, the non-touch, single-touch, and multi-touch inter-terminal resistance values in the initial state are respectively the initial non-touch inter-terminal resistance values (initial non-touch resistance value: preset resistance value) and initial single inter-terminal resistance values ( Initial single touch resistance value) and initial multi-terminal resistance value (initial multi-touch resistance value).

  Single touch is an operation of touching one point on the touch panel 100, and multi-touch is an operation of touching a plurality of points on the touch panel 100.

  Further, the initial value recording unit records initial threshold values related to single touch and multi-touch according to the initial single-terminal resistance value and the initial multi-terminal resistance value. Hereinafter, the initial threshold values related to single touch and multitouch are referred to as an initial single threshold value (initial single touch threshold value) and an initial multi threshold value (initial multitouch threshold value), respectively. The threshold recording unit records values that are finally used as thresholds in single touch and multi-touch. Hereinafter, values finally used as thresholds in single touch and multitouch are referred to as a single threshold (single touch threshold) and a multi threshold (multitouch threshold), respectively.

  The arithmetic processing device 300 determines whether the touch operation is a single touch or a multi-touch based on the single threshold value and the multi-threshold value when the user performs a touch operation.

  Here, calculation of the initial single threshold and the initial multi-threshold will be described.

  First, the resistance value between terminals when performing single touch and multi-touch in the initial state is measured a plurality of times. At this time, in the single touch, the touch panel 100 is touched with a stick or the like assuming a large finger. On the other hand, in multi-touch, the touch panel 100 is similarly touched with a stick or the like, assuming that the distance between two fingers is narrow. That is, the measurement is performed in a state where the inter-terminal resistance values are approximate to each other in single touch and multi-touch.

  Subsequently, the average value is calculated by averaging the measurement values obtained by a plurality of measurements for each single touch and multi-touch. Then, an initial single threshold value and an initial multi-threshold value are obtained with a margin of 10% for each average value. Here, in single touch, a value obtained by subtracting 10% of the average value from the average value is set as the initial single threshold value. In multi-touch, a value obtained by adding 10% of the average value to the average value is set as the initial multi-threshold value.

  The inter-terminal resistance value, the initial single threshold value, and the initial multi-threshold value are used as a reference when calculating a threshold value to be described later.

  FIG. 2 is a diagram for explaining the measurement of the inter-terminal resistance value in the touch panel 100 shown in FIG.

  In FIG. 2, the touch panel 100 includes an upper sheet 101 and a lower sheet 102. The upper sheet 101 has an inter-terminal resistance for detecting a touch position in the vertical direction (hereinafter referred to as Y direction) in the drawing, and the lower sheet 102 detects a touch position in the horizontal direction (hereinafter referred to as X direction). It is equipped with a resistance between terminals.

  First, when measuring the inter-terminal resistance value in the X direction, the inter-terminal resistance measurement unit 100a turns on the switch 108, connects the switch 106 to the terminal H, and connects the switch 105 to the terminal C. All the other switches are opened (open). As a result, the voltage value VA / D obtained by resistance-dividing the reference voltage VCC110 by the inter-terminal resistance Rtx and the fixed resistance Rx113 in the X direction is input to the ADC (A / D converter) 109.

  This ADC 109 is provided in the terminal-to-terminal resistance measurement unit 100a, and the ADC 109 A / D converts the voltage value VAD and sends it to the arithmetic processing unit 300. Then, the arithmetic processing unit 300 calculates the resistance value of the inter-terminal resistance Rtx in the X direction by the equation (1) (hereinafter, the resistance value of the inter-terminal resistance Rtx is also expressed by Rtx).

Rtx = Rx (Vcc−VA / D) / VA / D (1)
Subsequently, when measuring the inter-terminal resistance value in the Y direction, the inter-terminal resistance measurement unit 100a turns on the switch 107, connects the switch 104 to the terminal E, and connects the switch 103 to the terminal B. All other switches are open. As a result, the voltage value VA / D obtained by dividing the reference voltage VCC110 by the Y-terminal resistance Rty and the fixed resistance Ry112 is input to the ADC 109. Then, the arithmetic processing device 300 calculates the resistance value of the inter-terminal resistance Rty in the Y direction (hereinafter, the resistance value of the inter-terminal resistance Rty is also expressed by Rty) by the expression (2).

Rty = Ry (Vcc−VA / D) / VA / D (2)
FIG. 3 is a flowchart for explaining calculation and update of a single threshold value and a multi-threshold value performed by the touch panel device shown in FIG. Note that the processing according to the illustrated flowchart is performed under the control of the arithmetic processing device 300.

  When the power of the touch panel device is turned on (that is, when the touch panel device is activated), the arithmetic processing device 300 starts threshold value calculation and update processing. First, the arithmetic processing device 300 determines whether or not the user is touching the touch panel 100. That is, the arithmetic processing unit 300 determines whether or not the touch panel 100 is in a non-touch state (step S101).

  If it is not in the non-touch state, that is, if the user is touching touch panel 100 (NO in step S101), arithmetic processing unit 300 stands by. On the other hand, when it is in the non-touch state (YES in step S101), the arithmetic processing unit 300 performs the inter-terminal resistance values Rtx and Rty in the non-touch state by the inter-terminal resistance value measuring unit 100a as described in FIG. Is obtained (step S102).

  Subsequently, the arithmetic processing device 300 confirms whether the resistance value between the terminals is changed due to the influence of the temperature change or the secular change. Here, the arithmetic processing device 300 determines the difference (comparison result) between the initial non-touch terminal resistance value (initial value) recorded in the recording device 400 and the inter-terminal resistance value (measured value) obtained in the process of step S102. ) Then, the arithmetic processing device 300 determines whether or not there is a difference (whether or not the difference is zero) (step S103). That is, the arithmetic processing unit 300 determines whether or not there is a change in the measurement value.

  If there is a difference (YES in step S103), processing unit 300 uses the initial non-touch terminal resistance value, initial single-terminal resistance value, and initial multi-terminal resistance value (that is, initial inter-terminal resistance value). As described later, the change rates α and β between the non-touch state and the touch state are obtained (step S104).

  Here, the initial non-touch terminal resistance value recorded in the recording apparatus 400 is A [Ω], the initial single-terminal resistance value is B [Ω], and the initial multi-terminal resistance value is C [Ω]. . A measurement value in a non-touch state measured by the inter-terminal resistance value measurement unit 100a (non-touch inter-terminal resistance value: non-touch resistance value) is defined as D [Ω]. Also, the predicted inter-terminal resistance values (predicted single touch resistance value and predicted multi-touch resistance value) in single touch and multi-touch corresponding to the measured values are P [Ω] and Q [Ω], respectively. The initial single threshold value is W [Ω], and the initial multi-threshold value is V [Ω].

  By the way, in the touch panel 100, the inter-terminal resistance value when touched is determined by a ratio of a range such as pressing when touched to the overall inter-terminal resistance value in a non-touch state. That is, even if there is a change in the overall inter-terminal resistance value in the non-touch state, the ratio will be the same if the pressing range is the same.

  Therefore, the arithmetic processing device 300 calculates the change rates α and β using the following equations (3) and (4).

α = B / A (3)
β = C / A (4)
Next, as shown in Expression (5) and Expression (6), the arithmetic processing device 300 multiplies the non-touch terminal resistance value (measured value) by the change rates α and β described above to calculate the predicted terminal resistance. Values P [Ω] and Q [Ω] are obtained (step S105).

P = α × D [Ω] (5)
Q = β × D [Ω] (6)
Subsequently, as shown in Expression (7) and Expression (8), the arithmetic processing unit 300 determines the predicted inter-terminal resistance values P [Ω] and Q [Ω] obtained in Step S105 and the initial single-terminal resistance value B. The difference between [Ω] and the initial multi-terminal resistance C [Ω] is obtained. Then, the arithmetic processing unit 300 adds the difference to the initial single threshold value W [Ω] and the initial multi threshold value V [Ω], respectively, to obtain a single threshold value and a multi threshold value (step S106).

Single threshold = (P−B) + W [Ω] (7)
Multi-threshold = (Q−C) + V [Ω] (8)
Thereafter, the arithmetic processing device 300 updates the single threshold value and the multiple threshold value recorded in the threshold value recording unit as the threshold values to be finally used as the single threshold value and the multiple threshold value calculated in Step S106 (Step S107). Then, the arithmetic processing device 300 ends the threshold calculation and update processing.

  If there is no difference in step S103 (NO in step S103), it is assumed that arithmetic processing device 300 is not affected by temperature change or secular change. Then, the arithmetic processing device 300 does not update the single threshold value and the multiple threshold value recorded in the threshold value recording unit (step S108), and ends the threshold value calculation and update processing.

  As described above, in the first embodiment of the present invention, the single threshold value and the multi-threshold value are updated according to the temperature change or the secular change. Accordingly, it is possible to reliably prevent erroneous detection when determining whether the touch is a single touch or a multi-touch caused by a temperature change or a secular change.

  In other words, if the inter-terminal resistance value changes due to temperature change or secular change, an error may occur that determines multi-touch as single touch, but if the single threshold and multi-threshold are updated, such erroneous determination may occur. There is no.

[Second Embodiment]
Next, an example of a touch panel device according to the second embodiment of the present invention will be described.

  In a small device such as a digital camera, power is generally turned on / off in a short time. For this reason, as described with reference to FIG. 3, if the single threshold value and the multiple threshold value are calculated and updated when the power is turned on, the influence of the secular change or the temperature change can be dealt with.

  On the other hand, even if the single threshold value and multi-threshold value calculation and update processes described in FIG. 3 are applied to equipment that is used continuously for a long time (for example, an ATM of a public facility, a system that operates 24 hours), If it is not turned on after being turned off, update processing is not performed. For this reason. While using the device, the resistance value between terminals may change due to the influence of temperature change or secular change. For this reason, in the second embodiment, the update process is executed at a predetermined timing.

  Although not shown, the touch panel device according to the second embodiment includes at least a temperature detection unit and a time detection unit in addition to the configuration of the touch panel device shown in FIG. The temperature detection unit and the time detection unit are provided in the arithmetic processing device 300, for example.

  Factors that cause the temperature of the touch panel device to rise include, for example, environmental temperature, temperature due to backlight heat of the LCD panel 200, temperature due to heat of components other than the LCD panel 200, ICs, and the like.

  By the way, the resistance value between terminals does not change immediately only because the temperature of the touch panel device changes, but the change in resistance value between terminals increases as the temperature changes for a long time.

  FIG. 4 is a diagram for explaining an example of the relationship between the passage of time and the resistance between terminals in the touch panel device according to the second embodiment of the present invention. FIG. 4A is a diagram showing a transition of the resistance value between terminals at a high temperature, and FIG. 4B is a diagram showing a transition of the resistance value between terminals at a low temperature.

  4 (a) and 4 (b), the horizontal axis indicates time, and the vertical axis indicates inter-terminal resistance. As shown in the figure, at low temperatures, the inter-terminal resistance slightly decreases with time, but hardly changes. On the other hand, at a high temperature, the inter-terminal resistance value gradually increases, and it can be seen that the inter-terminal resistance value changes greatly after 500 hours.

  In other words, the resistance value between terminals hardly changes at low temperatures when the touch panel device is not operating, but when the touch panel device operates, the internal temperature changes to become a high temperature state and the inter-terminal resistance value changes greatly. Become.

  Therefore, in the second embodiment, when the temperature of the touch panel device is monitored and a time when the inter-terminal resistance value changes greatly, that is, when a predetermined time elapses after the touch panel device is operated, FIG. Perform the update process described.

  FIG. 5 is a flowchart for explaining calculation and update of a single threshold value and a multi-threshold value performed by the touch panel device according to the second embodiment of the present invention. In FIG. 5, the same steps as those in the flowchart shown in FIG. 3 are denoted by the same reference numerals, and the description thereof is omitted.

  As described with reference to FIG. 3, when the power of the touch panel device is turned on, the arithmetic processing device 300 starts measuring time by the time detection unit. The unit arithmetic processing device 300 performs the processes of steps S101 to S108.

  After the process of step S107 or S108, the arithmetic processing unit 300 determines whether or not a predetermined time has elapsed after the power is turned on by the time detection unit (step S201). If the predetermined time has not elapsed (NO in step S201), arithmetic processing unit 300 stands by. On the other hand, when the predetermined time has elapsed (YES in step S201), arithmetic processing unit 300 determines whether or not the touch panel device is powered on (step S202).

  If the power is off (NO in step S202), arithmetic processing unit 300 ends the threshold value calculation and update process. On the other hand, when the power is on (YES in step S202), arithmetic processing unit 300 returns to the process in step S101 and performs threshold value calculation and update processing.

  Here, the determination of the predetermined time will be described with reference to FIG.

  As shown in FIG. 4A, when the change in the resistance value between terminals with the passage of time is large, it is necessary to frequently monitor the resistance value between terminals. For this reason, the detection time (that is, the predetermined time) for determining whether or not the inter-terminal resistance value has changed is shortened. On the other hand, as shown in FIG. 4B, when the change in the inter-terminal resistance value with respect to the passage of time is small, the detection time for determining whether or not the inter-terminal resistance value has changed is lengthened.

  As described above, when the temperature changes, the amount of change in the inter-terminal resistance value with the passage of time changes, so the detection time is changed according to the temperature. For example, if the temperature detected by the temperature detection unit is higher than a predetermined temperature, the change in the inter-terminal resistance value with the passage of time increases, so the arithmetic processing device 300 shortens the detection time (predetermined time). On the other hand, when the temperature detected by the temperature detection unit is equal to or lower than the predetermined temperature, the arithmetic processing device 300 does not change the detection time.

  Thus, in the second embodiment of the present invention, when the power is turned on, threshold value calculation and update processing are performed. Then, if the power is on even after a predetermined time has elapsed, threshold value calculation and update processing are performed again. Thereby, even if the touch panel device is used for a long time, it is possible to reliably prevent erroneous detection when determining whether the touch is a single touch or a multi-touch caused by a temperature change or a secular change.

[Third Embodiment]
Next, an example of a touch panel device according to the third embodiment of the present invention will be described.

  In the first embodiment described above, the threshold value calculation and update processing are performed each time the touch panel device is turned on. For this reason, even if it is a case where there is almost no influence of a temperature change or a secular change, a threshold calculation and an update process are performed when the power supply of a touch panel apparatus is turned on.

  In the third embodiment, when there is almost no influence of temperature change or aging change, threshold calculation and update processing are not performed even when the power of the touch panel device is turned on.

  The touch panel device according to the third embodiment includes a comparison unit and a comparison target recording unit (not shown) in addition to the configuration of the touch panel device shown in FIG. In the comparison target recording unit, the inter-terminal resistance value compared in the comparison unit is recorded as a comparison target. In this comparison target recording unit, the initial non-touch terminal resistance value is recorded as an initial value, and then the initial non-touch terminal resistance value is determined by the non-touch terminal resistance value measured by the inter-terminal resistance measurement unit 100a. Updated.

  The comparison target recording unit is provided in the recording device 400, and the comparison unit is provided in the arithmetic processing device 300.

  FIG. 6 is a flowchart for explaining calculation and update of a single threshold value and a multi-threshold value performed by the touch panel device according to the third embodiment of the present invention. In FIG. 6, the same steps as those in the flowchart shown in FIG. 3 are denoted by the same reference numerals, and the description thereof is omitted.

  In the process of step S101 described with reference to FIG. 3, if it is in the non-touch state, the arithmetic processing unit 300 records the measured value (inter-terminal resistance value) measured by the inter-terminal resistance value measuring unit 100a and the comparison target recording unit. The comparison value is compared with the resistance value between terminals. Then, the arithmetic processing unit 300 determines whether or not the measured value and the inter-terminal resistance value recorded in the comparison target recording unit are the same according to the comparison result (step S301).

  If they are the same (YES in step S301), the arithmetic processing unit 300 proceeds to the process of step S301 described in FIG. On the other hand, if they are not the same (NO in step S301), arithmetic processing unit 300 proceeds to the process of step S103 described in FIG.

  After the process of step 106 described in FIG. 3, the arithmetic processing unit 300 records the single threshold value and the multi threshold value obtained in step S106 in the threshold value recording unit for each non-touch terminal resistance value obtained as a result of the measurement. (Step S302). Thereafter, the arithmetic processing device 300 proceeds to the process of step S107.

  As described above, in the third embodiment of the present invention, when the resistance value between terminals does not change, threshold calculation and update processing are not performed even when the power is turned on. It is not performed and power consumption can be reduced.

  As is clear from the above description, in the example shown in FIG. 1, the recording apparatus 400 is used as a threshold value storage unit and a resistance value storage unit. Further, the inter-terminal resistance value measuring unit 100a and the arithmetic processing unit 300 function as an updating unit. The recording device 400 and the arithmetic processing device 300 function as determination means.

  As mentioned above, although this invention was demonstrated based on embodiment, this invention is not limited to these embodiment, Various forms of the range which does not deviate from the summary of this invention are also contained in this invention. .

  Moreover, what is necessary is just to make this touch panel apparatus perform this control method by using the function of said embodiment as a control method. Moreover, you may make it make the computer with which a touchscreen apparatus is provided perform the said control program by using the program which has the function of the above-mentioned embodiment as a control program. The control program is recorded on a computer-readable recording medium, for example.

[Other Embodiments]
The present invention supplies a program that realizes one or more functions of the above-described embodiments to a system or apparatus via a network or a storage medium. It can also be realized by a process in which one or more processors in the computer of the system or apparatus read and execute the program. It can also be realized by a circuit (for example, ASIC) that realizes one or more functions.

DESCRIPTION OF SYMBOLS 100 Touch panel 100a Inter-terminal resistance measurement part 101 Upper sheet 102 Lower sheet 200 LCD panel 300 Arithmetic processing device 400 Recording device

Claims (12)

A touch panel device including a touch panel whose resistance value changes according to a touch position, and accepting an operation according to the touch position when the touch operation is performed on the touch panel.
When determining whether a single touch threshold value used when determining whether or not a single touch operation for touching one point on the touch panel has been performed and whether or not a multi touch operation for touching a plurality of points on the touch panel has been performed. Determining means for determining whether the single touch or the multi-touch has been performed based on a multi-touch threshold used in
When the touch panel device is activated, the resistance value of the touch panel when the touch panel is in a non-touch state is measured as a non-touch resistance value, and according to the non-touch resistance value and a preset resistance value Update means for performing an update process for updating the single touch threshold and the multi-touch threshold;
A touch panel device comprising:   2. The touch panel device according to claim 1, wherein an initial non-touch resistance value obtained by measuring in advance a resistance value in a non-touch state in which the touch panel is not touch-operated is the preset resistance value. . Furthermore, the resistance value at the time of the single touch is measured in advance as an initial single touch resistance value, and the resistance value at the time of the multi-touch is measured in advance as an initial multi-touch resistance value,
The updating unit may determine that the initial non-touch resistance value, the initial single touch resistance value, the initial multi-touch resistance value, the initial multi-touch resistance value, the initial multi-touch resistance value, and the initial multi-touch resistance value are the predetermined results. The touch panel device according to claim 2, wherein the single touch threshold value and the multi-touch threshold value are updated using a touch resistance value and the non-touch resistance value. Threshold storage means for storing the single touch threshold and the multi-touch threshold;
The touch panel device according to claim 3, further comprising a resistance value storage unit that stores the initial non-touch resistance value, the initial single touch resistance value, and the initial multi-touch resistance value. The update means obtains a difference between the initial non-touch resistance value and the non-touch resistance value as the comparison result,
The touch panel device according to claim 3 or 4, wherein the difference is not zero as the predetermined result.   The updating means obtains a change rate of a resistance value between the initial non-touch resistance value and the initial single touch resistance value as a first change rate, and a resistance between the initial non-touch resistance value and the initial multi-touch resistance value. A change rate of the value is obtained as a second change rate, and the non-touch resistance value is multiplied by the first change rate and the second change rate, respectively, and a predicted single touch resistance value and a predicted multi-touch resistance value are obtained. The single touch threshold value and the multi touch threshold value stored in the threshold value storage means according to the predicted single touch resistance value, the predicted multi touch resistance value, the initial single touch resistance value, and the initial multi touch resistance value. The touch panel device according to claim 3, wherein the touch panel device is updated.   The touch panel device according to claim 1, wherein the update unit performs the update process every time the touch panel device is powered on.   The update means performs the update process when the power of the touch panel device is turned on, and performs the update process again every time a predetermined time elapses after the power is turned on. The touch panel device according to any one of 1 to 6.   The touch panel device according to claim 8, wherein the update unit changes the predetermined time according to a temperature of the touch panel device.   10. The touch panel device according to claim 1, wherein the update unit does not perform the update process when the preset resistance value and the non-touch resistance value are the same. 11. . A touch panel device control method comprising a touch panel whose resistance value changes according to a touch position, and accepting an operation according to the touch position when the touch operation is performed on the touch panel.
When determining whether a single touch threshold value used when determining whether or not a single touch operation for touching one point on the touch panel has been performed and whether or not a multi touch operation for touching a plurality of points on the touch panel has been performed. A determination step of determining whether the single touch or the multi-touch has been performed based on a multi-touch threshold used in
When the touch panel device is activated, the resistance value of the touch panel when the touch panel is in a non-touch state is measured as a non-touch resistance value, and according to the non-touch resistance value and a preset resistance value An updating step of updating the single touch threshold and the multi-touch threshold;
A control method characterized by comprising: A control program including a touch panel whose resistance value changes according to a touch position, and used in a touch panel device that accepts an operation according to the touch position when the touch operation is performed on the touch panel.
A computer included in the touch panel device,
When determining whether a single touch threshold value used when determining whether or not a single touch operation for touching one point on the touch panel has been performed and whether or not a multi touch operation for touching a plurality of points on the touch panel has been performed. A determination step of determining whether the single touch or the multi-touch has been performed based on a multi-touch threshold used in
When the touch panel device is activated, the resistance value of the touch panel when the touch panel is in a non-touch state is measured as a non-touch resistance value, and according to the non-touch resistance value and a preset resistance value An updating step of updating the single touch threshold and the multi-touch threshold;
A control program characterized by causing