WO2015079599A1 - 電子機器 - Google Patents

電子機器 Download PDF

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Publication number
WO2015079599A1
WO2015079599A1 PCT/JP2014/003904 JP2014003904W WO2015079599A1 WO 2015079599 A1 WO2015079599 A1 WO 2015079599A1 JP 2014003904 W JP2014003904 W JP 2014003904W WO 2015079599 A1 WO2015079599 A1 WO 2015079599A1
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Prior art keywords
threshold value
value
electrostatic
electrostatic switch
threshold
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PCT/JP2014/003904
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English (en)
French (fr)
Japanese (ja)
Inventor
立石　雅彦
正仁 山崎
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株式会社デンソー
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Publication of WO2015079599A1 publication Critical patent/WO2015079599A1/ja

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/96—Touch switches
    • H03K17/962—Capacitive touch switches

Definitions

  • the present disclosure relates to an electronic device including an electrostatic switch.
  • an electrostatic switch that detects an input operation by an operating body such as a finger from a change in capacitance, such as a digital camera disclosed in Patent Document 1
  • Such an electrostatic switch includes an input detection sensor that detects a change in capacitance caused by an input operation, and an input detection unit that determines whether there is an input operation based on the capacitance detected by the input detection sensor.
  • the configuration disclosed in Patent Document 1 further includes a sensitivity detection sensor provided at a position where it is easy to hit a finger, and a control unit that controls the sensitivity of the electrostatic switch based on the detection result of the sensitivity detection sensor.
  • the sensitivity detection sensor of Patent Document 1 needs to be in contact with a finger that holds the electronic device, it can be applied only to an electronic device such as a digital camera used in the holding state. Therefore, the inventor of the present disclosure tried to realize an electrostatic touch switch that can correctly detect an input operation by an operating body without separately providing a configuration like the above-described sensitivity detection sensor.
  • the threshold value used for determining whether or not there is an input operation is set low so that a finger with a glove can be detected.
  • the sensitivity of the electrostatic switch can be increased, so that even an input operation with a finger wearing a glove can be detected by the electrostatic switch.
  • the electrostatic switch reacts sensitively to fingers that are not wearing gloves, and thus erroneous detection may occur frequently against the operator's intention.
  • Such phenomenon occurs particularly in the driving environment of automobiles. More specifically, it is assumed that the vehicle moves up and down due to the unevenness of the road when the operator tries to release the finger by operating the electrostatic switch on the control panel. Then, the finger may touch lightly another electrostatic switch that is close to the electrostatic switch that was the operation target. In such a situation, if the sensitivity of the electrostatic switch is too sensitive, the electrostatic switch is turned on even with such an unintended light contact, resulting in false detection.
  • the present disclosure provides an electrostatic touch switch that can correctly detect an input operation by an operating body in accordance with the state of the operating body without separately providing a configuration for detecting the state of the operating body.
  • An electronic device is based on an electrostatic switch that detects a change in electrostatic capacitance accompanying an input operation by an operating body, and an electrostatic capacitance detected by the electrostatic switch exceeds a threshold value.
  • the determination means for determining whether there is an input operation by the operating body, and the threshold used by the determination means at a predetermined time after the determination means determines that there is an input operation from the first threshold value as a normal value
  • Threshold change means for changing to a second threshold value that is equal to or greater than the first threshold value.
  • the sensitivity of the electrostatic switch before the input operation is increased by setting the first threshold value used for determination as a normal value low. Therefore, even when a finger wearing a glove performs an input operation as an operating body, the input operation by the operating body can be detected by the electrostatic switch.
  • the threshold value used in the determination unit is changed from the first threshold value which is a normal value to the second threshold value which is equal to or higher than the first threshold value. Therefore, the sensitivity of the electrostatic switch is temporarily lowered for a predetermined time after the input operation is performed. Therefore, even when a finger or the like that is not wearing a glove is the operating body, a situation in which the electrostatic switch frequently causes false detection contrary to the operator's intention can be avoided.
  • the drawing It is a figure which shows the state mounted in the vehicle of the control panel by one Embodiment of this indication. It is a front view of a control panel. It is a block diagram which shows the electrical structure of a control panel. It is a figure which shows the relationship between the peak value of the electrostatic capacitance which changes with the presence or absence of a glove, and the threshold value used for determination. It is a figure which shows the change of the electrostatic capacitance which arises by input operation with a bare hand, and the change of the threshold value accompanying it along progress of time.
  • a control panel 100 according to an embodiment of the present disclosure shown in FIGS. 1 and 2 is an electronic device for operating an air conditioner AC mounted on a vehicle.
  • the control panel 100 is installed in a center cluster 90a provided in the instrument panel 90 in the passenger compartment, and exposes the plurality of electrostatic switches 30 in a range where the operator's finger F can be easily reached.
  • the operator can change the operation mode of the air conditioner AC, adjust the set value, and the like by an input operation to the electrostatic switch 30.
  • Information indicating the operating state of the air conditioner AC is notified to the operator by display on the display 91 installed in the center cluster 90a.
  • the plurality of electrostatic switches 30 are arranged at intervals in the horizontal direction and the vertical direction of the control panel 100.
  • a set of fan switches 301a and 301b, a mode change switch 302, an inside / outside air change switch 303, and the like are arranged on the upper stage of the control panel 100.
  • an auto air conditioner switch 304 and the like are arranged in addition to the front defroster switch and the rear window defogger switch.
  • Two sets of temperature control switches 305a, 305b, 306a, 306b, and the like are arranged in the lower stage of the control panel 100.
  • the fan switches 301a and 301b are assigned an air volume adjustment function for adjusting the set value of the air volume of the air conditioner AC.
  • a mode switching switch 302 is assigned a switching function for switching the operation mode of the air outlet in a cyclic order, for example, FACE mode ⁇ BiLevel ⁇ FOOT.
  • the inside / outside air changeover switch 303 is assigned a switching function for switching between the inside air circulation mode and the outside air introduction mode in the air conditioner AC.
  • a switching function that circulates three or more operation modes is called a circulation switching function
  • a switching function that changes two operation modes such as switching between an inside air circulation mode and an outside air introduction mode. This is called simple switching function.
  • the auto air conditioner switch 304 is assigned with a simple switching function for switching the auto air conditioner on and off.
  • a temperature adjustment function for adjusting a temperature setting value on the driver's seat side (see FIG. 1) in the air conditioner AC is assigned to the temperature adjustment switches 305a and 305b.
  • a temperature adjustment function for adjusting a temperature setting value on the passenger seat side (see FIG. 1) in the air conditioner AC is assigned to the temperature adjustment switches 306a and 306b.
  • control panel 100 includes a switch panel member 10, a plurality of switch electrodes 20, a control circuit 50, and the like.
  • the switch panel member 10 is formed, for example, by using a light-transmitting resin material processed into a plate shape as a base material, and coating the base material with a light-shielding paint or printing with a light-shielding ink.
  • a plurality of input surfaces 11 are formed on the front surface exposed to the operator of the switch panel member 10.
  • the input surface 11 is a part of the electrostatic switch 30 and is a part that contacts the finger F in the electrostatic switch 30.
  • Each input surface 11 is formed with an icon 12 that abstracts the function assigned to each electrostatic switch 30.
  • the icon 12 is formed by translucent painting or printing applied in place of light-shielding painting or printing.
  • the icon 12 is lit and displayed by transmitting light from a light source (not shown) provided on the back surface 13 side of the switch panel member 10.
  • the switch electrode 20 forms an electrostatic switch 30 by being combined with the input surface 11 and the like.
  • the switch electrode 20 is formed in a film shape by a conductive polymer paint (for example, PEDOT) applied to an insulating film.
  • the switch electrode 20 has translucency so that light from the light source can be transmitted toward the switch panel member 10.
  • Each switch electrode 20 is attached to the back surface 13 located on the opposite side of the input surface 11 in the switch panel member 10 with a double-sided tape or an adhesive so as to overlap each icon 12, and is electrically connected to the control circuit 50. It is connected to the.
  • the switch electrode 20 generates a capacitance C between the switch electrode 20 and the finger F touching the input surface 11.
  • the capacitance C generated between the finger F and the switch electrode 20 changes according to the distance from the input surface 11 to the finger F.
  • the material for forming the switch electrode 20 for example, indium tin oxide, a metal film material having a large number of light-transmitting holes, a printing material containing a conductive substance such as carbon, or the like is employed instead of the above-described material. Is possible.
  • the control circuit 50 includes a capacitance measuring unit 51, an operation determining unit 52, a threshold setting unit 53, and the like. These elements 51 to 53 may be configured by a combination of dedicated integrated circuits, or may be functional blocks of a microcomputer that executes a predetermined program.
  • the control circuit 50 is formed on a circuit board (not shown) disposed on the back surface 13 side of the switch panel member 10.
  • the capacitance measuring unit 51 acquires the change in the capacitance C detected by each electrostatic switch 30. Specifically, the capacitance measuring unit 51 acquires a signal (for example, a potential) output from each switch electrode 20 and individually measures the capacitance C generated in each electrostatic switch 30. The capacitance measuring unit 51 outputs the value of the capacitance C detected by the electrostatic switch 30 to the operation determining unit 52 and the threshold setting unit 53.
  • a signal for example, a potential
  • the operation determination unit 52 acquires the measured value of the capacitance C (see FIG. 4) detected by the electrostatic switch 30 from the capacitance measurement unit 51, and acquires the acquired capacitance C and a preset threshold value. Compare with Th (see FIG. 4).
  • the operation determination unit 52 individually holds a threshold Th for determining whether there is an input operation for each of the plurality of electrostatic switches 30.
  • the operation determination unit 52 can reset each threshold Th based on the output from the threshold setting unit 53.
  • the operation determination unit 52 determines whether there is an input operation with the finger F based on the fact that the capacitance C exceeds the threshold Th.
  • the state in which the capacitance C exceeds the threshold Th is referred to as the on state of the electrostatic switch 30, and the state in which the capacitance C is equal to or less than the threshold Th is referred to as the off state of the electrostatic switch 30.
  • the operation determination unit 52 causes the control unit of the air conditioner AC to acquire a determination result indicating the on / off state of each electrostatic switch 30 by outputting the determination result to the outside of the control circuit 50. In addition, the operation determination unit 52 outputs the above determination result to the threshold setting unit 53.
  • the threshold setting unit 53 has a timer 54.
  • the timer 54 is configured to measure the application time of a process (described later) for temporarily changing the threshold Th.
  • the time measured by the timer 54 is also output to the operation determination unit 52.
  • the threshold setting unit 53 acquires the measured value of the capacitance C detected by the electrostatic switch 30 from the capacitance measuring unit 51.
  • the threshold setting unit 53 acquires a determination result indicating the on / off state of each electrostatic switch 30 from the operation determination unit 52.
  • the capacitance C detected by the electrostatic switch 30 varies significantly depending on the state of the operating body such as the finger F. For example, when the operator performs an input operation with bare hands, as shown in FIG. 4, the measured peak value Cp (bf) of the capacitance surely exceeds the normal threshold Th. On the other hand, when an input operation is performed in a state where gloves are worn, the peak value Cp (gf) of the measured capacitance is greatly below the threshold Th. This is because the electric charge between the finger F and the switch electrode 20 decreases as a result of the distance between the finger F and the switch electrode 20 being increased by the interposition of the gloves.
  • the threshold setting unit 53 illustrated in FIG. 3 appropriately corresponds to the state of the operating body as described above, and has a function of resetting the threshold Th held in the operation determination unit 52.
  • the operation determination unit 52 can improve the operability of the input operation to each electrostatic switch 30 by adjusting the threshold Th.
  • the threshold setting unit 53 obtains an optimum threshold Th for detecting the finger F currently being operated from the capacitance C detected by the electrostatic switch 30 that has been input. Then, the threshold setting unit 53 outputs the calculated threshold Th to the operation determination unit 52, and temporarily changes the threshold Th held in the operation determination unit 52 after it is determined that there is an input operation. Details of the operation of the threshold value setting unit 53 for changing the threshold value Th will be described with reference to FIGS.
  • FIG. 5 shows the transition of the change in the capacitance C accompanying the input operation for turning on the electrostatic switch 30 between the times tb and te.
  • the threshold Th until the electrostatic switch 30 is turned on by an input operation is set to a reference threshold Tmin as a normal value.
  • the reference threshold value Tmin is a low value that can detect an input operation of the finger F wearing a glove (see FIG. 6).
  • the threshold value setting unit 53 acquires a capacitance peak value Cp (bf) from when the input operation ON time tb until a preset measurement time TP (for example, 200 milliseconds) elapses.
  • TP for example, 200 milliseconds
  • the threshold value setting unit 53 changes the threshold value Th from the reference threshold value Tmin to the adjustment threshold value Tar at the time tc when the measurement time TP has elapsed from the on time tb.
  • the adjustment threshold value Tar is a value that is greater than or equal to the reference threshold value Tmin and that is less than the peak value Cp (bf).
  • the threshold value setting unit 53 multiplies the peak value Cp (bf) by using a positive fraction less than 1 as a coefficient in order to set the adjustment threshold value Tar in a range lower than the peak value Cp (bf).
  • the adjustment threshold value Tar is calculated.
  • the threshold setting unit 53 continues to change the threshold Th to the adjustment threshold Tar from the off time te at which the electrostatic switch 30 switches from the on state to the off state until the time tr at which the predetermined time TA has elapsed.
  • the predetermined time TA is set to about 5 seconds, for example.
  • the threshold setting unit 53 returns the threshold Th from the adjustment threshold Tar to the reference threshold Tmin at time tr.
  • the transition of the change in the capacitance C shown in FIG. 6 is associated with the input operation performed by the finger F with the glove attached.
  • the electrostatic switch 30 is turned on at the on time tb by setting the reference threshold value Tmin assuming an input operation with the glove being worn.
  • the peak value Cp (gf) acquired at the measurement time TP is lower than the peak value Cp (bf) at the time of the input operation with bare hands. Therefore, the adjustment threshold value Ton remains at a value slightly higher than the reference threshold value Tmin.
  • the adjustment threshold value Tar is Are set to the same value as the reference threshold value Tmin.
  • the transition of the change in the capacitance C shown in FIG. 7 is an input operation with a bare hand and is associated with an input operation performed in a time shorter than the measurement time TP.
  • the threshold setting unit 53 calculates the adjustment threshold Tar by multiplying the peak value Cp (bf) measured between the on time tb and the off time te by a coefficient.
  • the threshold setting unit 53 changes the threshold Th from the reference threshold Tmin to the adjustment threshold Tar at the off time te, not at the time tc (see FIG. 5) when the measurement time TP has elapsed from the time tb.
  • the threshold setting unit 53 continues to change the threshold Th to the adjustment threshold Tar from time te to time tr when the predetermined time TA has elapsed.
  • the threshold setting unit 53 adjusts the threshold Th for that purpose.
  • the threshold setting unit 53 changes the threshold Th held for the specific electrostatic switch 30 from the reference threshold Tmin to the adjustment threshold Tar, and the threshold Th held for the non-specific electrostatic switch 30 is also changed from the reference threshold Tmin.
  • the adjustment threshold value Tar is changed (see FIG. 5 and the like). The values of these adjustment threshold values Tar may differ depending on the function assigned to the specific electrostatic switch 30. Details thereof will be described below.
  • the fan switches 301a and 301b, the temperature control switches 305a, 305b, 306a and 306b, and the mode change switch 302 can be subjected to continuous input operations, so-called “repetitive strikes”. Therefore, when any one of the switches 301a, 301b, 302, 305a, 305b, 306a, and 306b described above is the specific electrostatic switch 30, sensitivity adjustment for facilitating continuous hitting is performed.
  • the threshold setting unit 53 associates two functionally related ones among the plurality of electrostatic switches 30 as related electrostatic switches.
  • three sets of the fan switches 301a and 301b, the driver side temperature control switches 305a and 305b, and the passenger side temperature control switches 305a and 305b correspond to related electrostatic switches.
  • the threshold setting unit 53 sets each adjustment threshold Ton of the two related electric switches to substantially the same value.
  • the coefficient ai when calculating the adjustment threshold value Tar of the two related electrostatic switches is, for example, about 0.6.
  • each adjustment threshold value Tar of other electrostatic switches (non-related electrostatic switches) excluding two related electrostatic switches is set to a value higher than each adjustment threshold value Tar of the related electric switch. Therefore, the coefficient aj when calculating the adjustment threshold value Tar of the unrelated electrostatic switch is set to about 0.8, for example.
  • Each of the above coefficients is not limited to the above value as long as the relationship of 0 ⁇ ai ⁇ aj ⁇ 1 is satisfied, and may be changed as appropriate.
  • the threshold setting unit 53 sets the adjustment threshold Ton of the mode changeover switch 302 to a value lower than the adjustment threshold Tar of other non-specific electrostatic switches 30. .
  • a coefficient ai of about 0.6 is used.
  • a coefficient aj of about 0.8 is used for calculating the adjustment threshold value Tar of the non-specific electrostatic switch 30.
  • the threshold setting unit 53 substantially sets the same adjustment threshold Ton when each electrostatic switch 30 except the switches 301a, 301b, 302, 305a, 305b, 306a, and 306b is the specific electrostatic switch 30.
  • the same coefficient ai (for example, about 0.8) is used to calculate each adjustment threshold value Taj.
  • each threshold Th [i] held for each electrostatic switch 30 [i] is initialized. Specifically, the reference threshold value Tmin is sequentially substituted for all the threshold values Th [i], and the process proceeds to S2.
  • each electrostatic switch 30 is initialized to an off state. Specifically, the OFF value is sequentially substituted for all the state values S [i] indicating the on and off states of each electrostatic switch 30 [i], and the initialization process is terminated.
  • the determination process shown in FIG. 9 is repeatedly started by the operation determination unit 52 after the initialization process (see FIG. 8).
  • S11 of this determination process in order to set each threshold Th [i] of each electrostatic switch 30 [i] to the latest value, a threshold update process (see FIG. 10) described later is performed, and the process proceeds to S12.
  • S12 the value to be substituted for [i] is determined, thereby selecting the electrostatic switch 30 [i] to be processed later, and the process proceeds to S13.
  • the processes of S13 to S21 are performed for all the electrostatic switches 30 [i].
  • S13 it is determined whether or not the state value S [i] of the electrostatic switch 30 [i] selected in S12 is OFF. If an affirmative determination is made in S13, the process proceeds to S14. In S14, it is determined whether or not the current capacitance C acquired from the capacitance measuring unit 51 is equal to or greater than the threshold Th [i]. If a negative determination is made in S14, the process proceeds to S22. On the other hand, in S15 when an affirmative determination is made in S14, the state value S [i] of the electrostatic switch 30 [i] is switched from OFF to ON. In addition, in S15, the present time t is substituted as the on time tb [i] when the electrostatic switch 30 is turned on, and the process proceeds to S22.
  • the measurement time TP has just elapsed from the on time tb [i] depending on whether or not the difference between the current time t and the on time tb [i] is equal to the measurement time TP. It is determined whether or not. If an affirmative determination is made in S16 as the measurement time TP elapses from the on time tb [i], the process proceeds to S20. In S20, the peak value Cp of the capacitance from the on time tb [i] to the current time t when the measurement time TP has elapsed is calculated.
  • S17 when a negative determination is made in S16, it is determined whether or not the current capacitance C is less than the threshold value Th [i]. If a negative determination is made in S17 due to the electrostatic switch 30 being kept pressed, the process proceeds to S22.
  • the finger F is separated from the electrostatic switch 30, a positive determination is made in S17.
  • S18 for determining the OFF state of electrostatic switch 30 is carried out.
  • the state value S [i] of the electrostatic switch 30 [i] is switched from ON to OFF.
  • the present time t is substituted as the off time te [i] when the electrostatic switch 30 [i] is turned off, and the process proceeds to S19.
  • S19 it is determined whether or not the difference between the current time t and the on time tb [i], that is, the elapsed time from the on time tb [i] to the current time t is less than the measurement time TP. If the electrostatic switch 30 has been released within a measurement time TP by an input operation in a short time, an affirmative determination is made in S19. In S20 after an affirmative determination in S19, the peak value Cp of the capacitance due to the input operation less than the measurement time TP is calculated. On the other hand, if the electrostatic switch 30 has been pressed for the measurement time TP, a negative determination is made in S19. In this case, since the peak value Cp has been calculated by the determination process up to the previous time, the process proceeds to S22.
  • the threshold value setting process (see FIG. 11) described later is performed by the threshold value setting unit 53, and the process proceeds to S22.
  • the process returns to S12, and the target of processing is changed to the next electrostatic switch 30 [i + 1] by incrementing the value of [i] by one.
  • This threshold value update process is a process for changing the threshold value Th [i], which has been changed from the reference threshold value Tmin to the adjustment threshold value Taj, to the reference threshold value Tmin again after a predetermined time TA has elapsed.
  • S112 it is determined whether or not the threshold value Th [i] is larger than the reference threshold value Tmin. If a negative determination is made in S112, the process proceeds to S115. If it is determined in S112 that the threshold value Th [i] exceeds the reference threshold value Tmin, the process proceeds to S113.
  • S113 it is determined whether or not the state value S [i] of the electrostatic switch 30 [i] is OFF and the predetermined time TA has elapsed from the OFF time te [i]. If it is determined in S113 that the predetermined time TA has not elapsed, the process proceeds to S115. On the other hand, if a positive determination is made in S113, the process proceeds to S114. In S114, the threshold setting unit 53 substitutes the reference threshold Tmin for the threshold Th [i] held in the operation determination unit 52, and the process proceeds to S115.
  • the process returns to S111.
  • S111 by increasing the value of [i] by 1, the processing target is changed to the next electrostatic switch 30 [i + 1].
  • the threshold value update process is completed when the processes of S112 to S114 are completed for all the electrostatic switches 30. Thus, the process returns to the determination process shown in FIG. 9 and S12 (see FIG. 9) is performed.
  • the threshold setting process shown in FIG. 11 is performed by the operation determination unit 52 and the threshold setting unit 53.
  • This threshold value setting process is a process for individually setting the value of each threshold value Th [i].
  • Each coefficient used in the threshold determination process satisfies the relationship 0 ⁇ ai ⁇ aj ⁇ 1 as described above.
  • S211 it is determined whether or not one of the state values S [i] of the fan switches 301a and 301b (see FIG. 2), which are related electrostatic switches, is turned on. If a negative determination is made in S211, the operation proceeds to S213. On the other hand, if an affirmative determination is made in S211, in S212, the threshold Th [i] for the fan switches 301a and 301b is selected from the value obtained by multiplying the peak value Cp by the coefficient ai and the reference threshold Tmin. Set the larger value with. Further, the threshold Th [i] of the other electrostatic switches 30 (unrelated electrostatic switches) excluding the fan switches 301a and 301b is obtained by multiplying the peak value Cp by the coefficient aj and the reference threshold Tmin. Set to the larger one.
  • S213 it is determined whether or not one of the state values S [i] of the temperature adjustment switches 305a and 305b (see FIG. 2) on the driver's seat side is ON. If a negative determination is made in S213, the process proceeds to S215. On the other hand, if an affirmative determination is made in S213, in S214, the threshold Th [i] for the temperature adjustment switches 305a and 305b is calculated by multiplying the peak value Cp by the coefficient ai and the reference threshold Tmin. Set to the larger one. Further, each threshold Th [i] of the other electrostatic switches excluding the temperature adjustment switches 305a and 305b is set to a larger one of the value obtained by multiplying the peak value Cp by the coefficient aj and the reference threshold Tmin. Even when the passenger side temperature control switches 306a and 306b (see FIG. 2) are turned on, the processing corresponding to S213 and S214 is performed.
  • S215 it is determined whether or not the state value S [i] of the mode switch 302 is turned on. If a negative determination is made in S215, the process proceeds to S217. On the other hand, if an affirmative determination is made in S215, the larger one of the threshold Th [i] of the mode changeover switch 302 in S216 is the value obtained by multiplying the peak value Cp by the coefficient ai and the reference threshold Tmin. Set to. Further, each threshold Th [i] of the other electrostatic switches excluding the mode changeover switch 302 is set to the larger one of the value obtained by multiplying the peak value Cp by the coefficient aj and the reference threshold Tmin.
  • the threshold Th [i] of all the switches is set to the larger one of the value obtained by multiplying the peak value Cp by the coefficient aj and the reference threshold Tmin, and the threshold setting process is terminated. Thus, the process returns to the determination process shown in FIG. 9 and S22 is performed.
  • the sensitivity of the electrostatic switch 30 before the input operation is increased by setting the reference threshold Tmin low. Therefore, even when a finger F wearing a glove performs an input operation as an operating body, the input operation can be detected by the electrostatic switch 30.
  • the threshold Th is changed from the reference threshold Tmin to the adjustment threshold Taj. Therefore, the sensitivity of each electrostatic switch 30 is temporarily lowered during the predetermined time TA. Therefore, even when the finger F or the like not wearing gloves is the operating body, a situation in which the electrostatic switch 30 frequently causes false detections contrary to the operator's intention can be avoided.
  • control panel 100 that can correctly detect the input operation corresponding to the state of the operation body is realized without separately providing a configuration for detecting the state of the operation body such as the finger F.
  • the adjustment threshold value Ton is set in a range lower than the peak value Cp of the capacitance, it is determined whether there is an input operation based on the re-input operation performed within the predetermined time TA. Can be done.
  • the control panel 100 avoids frequent erroneous detections and performs a reliable input operation within the predetermined time TA. It can be detected correctly.
  • an adjustment threshold value Tar in a range lower than the peak value Cp is obtained.
  • the adjustment threshold value Tar corresponding to the state of the operating tool can be set.
  • the optimum adjustment threshold Tar is calculated according to the thickness of the glove, the strength of pressing the electrostatic switch 30, the conductivity of the surface of the finger F, and the like. Therefore, it is possible to reliably prevent the erroneous detection and to reliably detect the input operation within the predetermined time TA.
  • the adjustment threshold value Tar falls below the reference threshold value Tmin, erroneous detection is likely to occur due to excessive sensitivity increase.
  • the adjustment threshold value Tar is set to the same value as the reference threshold value Tmin. According to the above processing, frequent erroneous detection due to excessive sensitivity increase within the predetermined time TA can be prevented.
  • the adjustment threshold Tar of the specific electrostatic switch 30 is a non-specific electrostatic switch. It is set lower than 30 adjustment threshold value Taj.
  • the control panel 100 can correctly detect even when the electrostatic switch 30 is repeatedly input. It becomes possible.
  • the adjustment threshold values Tar of all the electrostatic switches 30 are raised to the same value.
  • the sensitivity of all the electrostatic switches 30 is temporarily lowered, so that the control panel 100 can quickly transition to a state in which it is difficult to cause erroneous detection.
  • each adjustment threshold value Tar of these two related electrostatic switches is set to the value of the other unrelated electrostatic switch. It is set lower than the adjustment threshold value Tar. According to such sensitivity setting, even if an input operation is performed subsequent to the two related electrostatic switches, such a series of input operations can be correctly detected. In addition, a situation in which a series of input operations to the related electrostatic switch is erroneously detected by another electrostatic switch 30 can be prevented.
  • the finger F corresponds to the “operation body” described in the claims
  • the reference threshold Tmin corresponds to the “first threshold” described in the claims
  • the adjustment threshold Tar is the patent. This corresponds to the “second threshold value” recited in the claims.
  • the operation determination unit 52 corresponds to “determination means” described in the claims
  • the threshold setting unit 53 corresponds to “threshold change means” described in the claims
  • the control panel 100 claims Corresponds to “electronic device” described in the range.
  • the coefficient ai corresponds to the “first coefficient” described in the claims
  • the coefficient aj corresponds to the “second coefficient” described in the claims
  • the air conditioner AC described in the claims. It corresponds to "equipment”.
  • the adjacent electrostatic switch 30 adjacent to the specific electrostatic switch 30 is changed. Sensitivity is lowered.
  • the inside / outside air changeover switch 303 shown in FIG. 2 is a specific electrostatic switch
  • the auto air conditioner switch 304 and the mode changeover switch 302 correspond to adjacent electrostatic switches, and the sensitivity is lowered.
  • the auto air conditioner switch 304 is likely to be close to the hand of an operator who performs an input operation to the inside / outside air changeover switch 303. Therefore, control for reducing the sensitivity of the auto air conditioner switch 304 is particularly effective for preventing erroneous detection.
  • the adjustment threshold Ton of the adjacent electrostatic switch 30 is higher than the adjustment threshold Tar of the specific electrostatic switch 30.
  • S217 of the threshold setting process shown in FIG. 11 is different from the above embodiment.
  • the adjustment threshold value Tar of the specific electrostatic switch 30 in which an input operation has been performed is a value obtained by multiplying the peak value Cp of the capacitance by a predetermined coefficient ai (for example, about 0.6).
  • the adjustment threshold value Tar of the adjacent electrostatic switch 30 is a value obtained by multiplying the coefficient aj by the peak value Cp.
  • the threshold value Th of the other electrostatic switches 30 excluding the specific electrostatic switch 30 and the adjacent electrostatic switch 30 may not be changed to the adjustment threshold value Tar.
  • a known technique can be appropriately applied as a method of calculating the peak value Cp of the capacitance in S21.
  • the maximum value of the capacitance C within the measurement time TP may be simply set as the peak value Cp.
  • the average value of the predetermined time before and behind including the maximum value of the electrostatic capacitance C may be made into the peak value Cp.
  • the maximum value or an average value within a predetermined time including the maximum value may be set as the peak value Cp.
  • the predetermined time TA which has been about 5 seconds, can be changed as appropriate.
  • the predetermined time TA is preferably shorter than a time that does not cause a significant change in the state of the operating body, such as wearing gloves.
  • the measurement time TP is not limited to 200 milliseconds, and can be appropriately changed within a range in which an input operation can be detected (for example, 40 to 200 milliseconds).
  • the threshold value Th is changed from the reference threshold value Tmin to the adjustment threshold value Tar at the time tc when the measurement time TP has elapsed from the on time tb or the off time te.
  • the timing at which the threshold Th is changed can be changed as appropriate.
  • the adjustment threshold Tar is set in a range lower than the peak value Cp of the capacitance.
  • the adjustment threshold Tar may be a value higher than the peak value Cp in order to reliably prevent erroneous detection.
  • the adjustment threshold value Tar is set by the product of the peak value Cp and the coefficients ai, aj.
  • the adjustment threshold value Tar is a preset fixed value that does not use the measured peak value Cp. Also good. Also in the form of using a coefficient for calculating the adjustment threshold value Taj, the value of this coefficient can be changed as appropriate.
  • the functions provided by the elements 51 to 53 provided in the control circuit 50 can be provided by hardware and software different from those described above, or a combination thereof.
  • the example in which the present disclosure is applied to the control panel 100 that operates the air conditioner AC mounted on the vehicle has been described.
  • the sensitivity of each electrostatic switch is temporarily lowered when the finger F is separated from the specific electrostatic switch. Therefore, even if the finger F trying to move away from a specific electrostatic switch lightly touches an unintended electrostatic switch due to the vertical movement of the vehicle due to road irregularities, the false detection of the electrostatic switch with such unintended light contact Can be prevented.
  • the present disclosure is not limited to the control panel 100 of the air conditioner AC, and can be applied to an operation device that operates a vehicle-mounted device or the vehicle-mounted device itself. Furthermore, the present disclosure is applicable not only to vehicles but also to all electronic devices including touch switches that detect an input operation based on a change in capacitance generated between an electrode and a finger.

Landscapes

  • Input From Keyboards Or The Like (AREA)
  • Position Input By Displaying (AREA)
  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)
PCT/JP2014/003904 2013-11-28 2014-07-24 電子機器 WO2015079599A1 (ja)

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JP2016115034A (ja) * 2014-12-12 2016-06-23 株式会社東海理化電機製作所 操作検出装置
JP2016159882A (ja) * 2015-03-05 2016-09-05 株式会社東海理化電機製作所 操作入力装置
JP6704754B2 (ja) * 2016-02-29 2020-06-03 アルプスアルパイン株式会社 判定装置及び判定方法
JP2018063802A (ja) * 2016-10-12 2018-04-19 株式会社デンソーウェーブ 静電容量式タッチスイッチ装置
WO2019030822A1 (ja) * 2017-08-08 2019-02-14 三菱電機株式会社 タッチパネル付き表示装置
JP2019121218A (ja) * 2018-01-09 2019-07-22 株式会社東海理化電機製作所 触覚呈示装置
JP2019121219A (ja) * 2018-01-09 2019-07-22 株式会社東海理化電機製作所 触覚呈示装置
JP2019156263A (ja) * 2018-03-15 2019-09-19 株式会社東海理化電機製作所 操作位置検出装置
JP7402750B2 (ja) * 2020-06-05 2023-12-21 株式会社東海理化電機製作所 静電センサ、制御装置、およびコンピュータプログラム

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JP2012098828A (ja) * 2010-10-29 2012-05-24 Minebea Co Ltd 電子機器の入力装置及び入力制御方法
JP2013088982A (ja) * 2011-10-17 2013-05-13 Rohm Co Ltd タッチ式入力装置およびそのコントローラ、制御方法、電子機器

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