CN113535009A - Touch detection device - Google Patents
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- CN113535009A CN113535009A CN202110302557.0A CN202110302557A CN113535009A CN 113535009 A CN113535009 A CN 113535009A CN 202110302557 A CN202110302557 A CN 202110302557A CN 113535009 A CN113535009 A CN 113535009A
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- 238000001514 detection method Methods 0.000 title claims abstract description 96
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- 230000007423 decrease Effects 0.000 claims abstract description 20
- 238000013459 approach Methods 0.000 claims description 8
- 230000009467 reduction Effects 0.000 abstract description 3
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
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Abstract
The present invention relates to a touch detection device that suppresses a decrease in detection accuracy of a touch operation. When the touch operation portion is pressed for a long time (Ts) or longer, the controller updates a reference capacitance value (Cbase) which is a reference of a threshold value (Cth) for detecting a touch operation, on the basis of the electrostatic capacitance value (Cap). The reference capacitance value is updated by setting the electrostatic capacitance value before reduction to an initial value (C0) and setting the electrostatic capacitance value (Δ C) according to whether the electrostatic capacitance value is equal to or greater than a predetermined capacitance value (Cref) (steps 120-128). Then, the electrostatic capacitance value after the change of the electrostatic capacitance value relative to the initial value reaches the electrostatic capacitance value (Δ C) is set as a reference capacitance value (steps 132-140). This makes it possible to appropriately update the reference capacitance value with respect to the threshold value, and to suppress a decrease in the detection accuracy of the touch operation.
Description
Technical Field
The present invention relates to a touch detection device.
Background
In the touch input device of patent document 1, in a touch panel in which a plurality of drive electrodes and a plurality of sensor electrodes are overlapped in a grid pattern to form a sensor pattern, a controller detects a change in capacitance at each intersection of the drive electrodes and the sensor electrodes, and detects a touch operation. In this touch input device, the reference value is updated by continuing a state in which the capacitances at the intersection points are within a constant range for a constant time.
Patent document 1: japanese patent laid-open publication No. 2017-111507
However, in the touch sensor, when the reference value is updated by continuing the state in which the electrostatic capacitance is within the constant range for a constant time, not only the update cycle of the reference value becomes long, but also the timing of updating the reference value is limited. Accordingly, a method is considered in which the reference value is updated using the capacitance after a predetermined time has elapsed after the long-press operation in which the touch sensor is touched by a finger for a long time.
However, in this method, although the time for updating the reference value can be shortened by shortening the elapsed time after the long press operation, setting the reference value in a state where the capacitance is not sufficiently reduced causes erroneous detection.
Disclosure of Invention
The present invention has been made in view of the above circumstances, and an object thereof is to provide a touch detection device capable of suppressing a decrease in detection accuracy.
The touch detection device of the first embodiment for achieving the above object includes: a sensor unit that changes capacitance in the sensor electrode when an operator approaches the sensor electrode; a detection unit that detects a capacitance value in the sensor electrode; a determination unit that determines whether or not an operator approaches the sensor unit based on whether or not the capacitance value detected by the detection unit reaches the threshold value, using a preset reference value and a threshold value set for the reference value; and an updating unit configured to set the capacitance value as an initial value when the capacitance value after a predetermined elapsed time has elapsed becomes equal to or greater than a predetermined value set in advance in a state where the capacitance value detected by the detecting unit has reached the threshold value, and update the capacitance value after a change in the capacitance value detected by the detecting unit from the initial value reaches a predetermined changed capacitance value as a new reference value.
In the touch detection device according to the second embodiment, in the first embodiment, the update unit may set the changed capacitance value so as to be smaller than that in a case where the capacitance value after the elapse of the predetermined time is smaller than the predetermined value, and update the capacitance value after the change in the capacitance value detected by the detection unit from the initial value reaches the changed capacitance value to a new reference value.
In the touch detection device according to the third embodiment, in the second embodiment, a first capacitance value that is the changed capacitance value when the capacitance value after the elapse of the elapsed time is equal to or greater than the predetermined value, and a second capacitance value that is the changed capacitance value when the capacitance value after the elapse of the elapsed time is smaller than the predetermined value are set in advance.
In the touch detection device according to the fourth embodiment, in any one of the first to third embodiments, the update unit sets, as the initial value, a maximum value of the capacitance value from a time point when the elapsed time has elapsed until the capacitance value detected by the detection unit starts decreasing.
In the touch detection device according to the fifth embodiment, in any one of the first to fourth embodiments, the change capacitance value is a capacitance value larger than a difference between the reference value before update and the threshold value.
In the touch detection device of the first embodiment, a sensor electrode whose capacitance changes as an operator approaches the sensor unit is provided, and the detection unit detects a capacitance value in the sensor electrode. The determination unit determines whether or not the operator is in proximity to the sensor unit, based on whether or not the capacitance value detected by the detection unit has reached the threshold value, using a preset reference value and a threshold value set with respect to the reference value. Therefore, the threshold value is changed by updating the reference value.
The updating unit can update the reference value after a predetermined elapsed time elapses in a state where the capacitance value detected by the detecting unit reaches the threshold value. When the capacitance value after the elapse of the predetermined elapsed time becomes equal to or greater than a predetermined value set in advance, the updating unit sets the capacitance value as an initial value, and updates the capacitance value after the change in the capacitance value detected by the detecting unit from the initial value reaches a predetermined changed capacitance value as a new reference value.
Accordingly, the reference value can be set by ensuring a variable capacitance value with respect to the predetermined value, so that erroneous determination due to an excessively high reference value can be suppressed, and a decrease in detection accuracy can be suppressed.
In the touch detection device according to the second embodiment, when the capacitance value after the elapse of the elapsed time is smaller than the predetermined value, the variable capacitance value is set so as to be smaller than when the capacitance value is equal to or larger than the predetermined value. The updating unit updates the capacitance value, which is obtained by changing the capacitance value detected by the detecting unit from the initial value to a changed capacitance value, to a new reference value.
Therefore, the reference value can be suppressed from becoming excessively low, and the decrease in detection accuracy can be effectively suppressed.
In the touch detection device according to the third embodiment, a first capacitance value applied as a variable capacitance value when a capacitance value after an elapse of time is equal to or greater than a predetermined value and a second capacitance value applied as a variable capacitance value when a capacitance value after an elapse of time is smaller than a predetermined value are set in advance. Therefore, the reference value for suppressing the decrease in detection accuracy can be appropriately updated.
In the touch detection device according to the fourth embodiment, the maximum value of the capacitance value from the time when the elapsed time has elapsed to the time when the capacitance value detected by the detection unit starts to decrease is set as the initial value. Thus, even if the contact method of the operator with the sensor unit changes, the reference value can be updated to an appropriate value.
In the touch detection device of the fifth embodiment, the change capacitance value is set to a capacitance value larger than the difference between the reference value before update and the threshold value. Accordingly, the reference value can be set so that the capacitance value exceeds the threshold value when the operator approaches the sensor unit, and erroneous determination can be suppressed when the operator approaches the sensor unit, thereby effectively suppressing a decrease in detection accuracy.
Drawings
Fig. 1 is a schematic configuration diagram showing a touch detection device according to the present embodiment.
Fig. 2 is a perspective view showing a main part of a vehicle in which a touch detection device is disposed.
Fig. 3 is a flowchart showing an outline of the touch detection process.
Fig. 4 is a flowchart showing an outline of the update processing.
Fig. 5A and 5B are diagrams showing each touch operation, a change in capacitance corresponding to the touch operation, and a change in determination signal.
Fig. 6A and 6B are graphs showing a touch operation, a change in capacitance corresponding to the touch operation, and a change in determination signal for each long press, and fig. 6A shows a case where the capacitance value is lower than that of fig. 6B.
Description of reference numerals
The touch panel includes a 10 … touch detection device, a 12 … touch operation unit (sensor unit), a 14 … controller, a 16 … sensor electrode, a 26 … detection unit (detection means), a 30 … determination unit (determination means), and a 32 … update unit (update means).
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
Fig. 1 is a schematic configuration diagram showing a touch detection device 10 according to the present embodiment.
As shown in fig. 1, the touch detection device 10 includes a touch operation unit 12 as a sensor unit and a controller 14. The touch operation unit 12 includes a sensor electrode 16, and the sensor electrode 16 is formed in a sheet shape using a conductive material.
In the touch operation portion 12, when an operator (for example, a fingertip of the operator) approaches the sensor electrode 16 (a touch operation is performed on the touch operation portion 12), electrostatic capacitance is generated between the sensor electrode 16 and the operator, and electrostatic capacitance (electrostatic capacitance value) Cap in the sensor electrode 16 changes. As the touch operation unit 12, either a self-capacitance system or a mutual capacitance system can be applied, and in the present embodiment, a mutual capacitance system in which the capacitance between the sensor electrode 16 and a drive electrode or the like, not shown, changes due to a touch operation is applied. In the following, for the sake of simplicity of explanation, a case will be described in which the capacitance value Cap of the sensor electrode 16 increases (becomes large) by a touch operation.
The touch operation unit 12 is electrically connected to the controller 14. The controller 14 detects the capacitance (including parasitic capacitance) and a change in the capacitance in the sensor electrode 16 of the touch operation portion 12. The controller 14 determines whether or not the finger of the operator is approaching, that is, whether or not the operator has performed a touch operation on the touch operation unit 12 (sensor electrode 16), based on the change in the capacitance value Cap of the sensor electrode 16. When the controller 14 determines that the touch operation is performed on the sensor electrode 16, the touch signal is turned on. In addition, the operator's finger is in a non-touch state in which the finger is separated from the sensor electrode 16, and the controller 14 makes a non-touch determination and turns OFF the touch signal.
The touch detection device 10 of the present embodiment can be connected to various devices to be operated provided in the vehicle 18. Fig. 2 shows a main part of a vehicle 18 provided with the touch detection device 10 in a perspective view from the outside in the vehicle width direction and from the oblique front side.
As shown in fig. 2, in the vehicle 18, a side door 20 is provided with a door outer handle (hereinafter, referred to as a door handle) 22. The door handle 22 is formed of an insulating material, and the door handle 22 may be of any one of a grab type, a barrier type, and a pop-up type (in fig. 2, the barrier type).
The side door 20 is provided with a lock mechanism (not shown) that is mechanically or electrically connected to the door handle 22. The lock mechanism restricts opening and closing of the side door 20 by being in a locked state, and allows opening and closing of the side door 20 by operation of the door handle 22 by being in an unlocked state.
The touch operation unit 12 (sensor electrode 16) of the touch detection device 10 is disposed on the door handle 22 of the side door 20 on the front seat side. The touch operation portion 12 is disposed on the vehicle outer side surface of the door handle 22 in a state where the sensor electrode 16 is covered with an insulating material. The touch operation unit 12 is not limited to the side door 20 on the front seat side, and may be disposed in a trunk lid or a handle of a rear door in the rear of the vehicle. The touch operation unit 12 may be provided in a side door on the rear seat side, and the side door on the rear seat side where the touch operation unit 12 is disposed is not limited to a hinge type and may be a slide type.
As shown in fig. 1, a door lock device 24 as an operated device is disposed in the vehicle 18. The door lock device 24 is electrically connected to a door lock mechanism (not shown) such as the side door 20, and the door lock device 24 switches between a locked state and an unlocked state with respect to the lock mechanism.
The door lock device 24 is electrically connected to the controller 14 of the touch detection device 10. The controller 14 outputs a touch signal to the door lock device 24 by a passenger touching the touch operation unit 12 of the door handle 22 of the side door 20. The door lock device 24 switches the lock mechanism to the locked state and the unlocked state each time the touch signal input from the controller 14 is turned ON. Further, in the door lock device 24, the lock operation is performed from inside the vehicle cabin (a control system of the vehicle 18, etc.), and the unlock corresponding to the touch signal of the controller 14 is restricted.
Here, as shown in fig. 1, the controller 14 of the touch detection device 10 is formed with a detection unit 26, a memory 28 as a storage means, a determination unit 30, and an update unit 32. The controller 14 includes a microcomputer (not shown) to which a CPU, a ROM, a RAM, a memory as a nonvolatile memory, and the like are connected via a bus. In the controller 14, the CPU reads out programs stored in the ROM and the memory, and develops and executes the programs in the RAM, thereby realizing the functions of the detection unit 26, the determination unit 30, and the update unit 32. In addition, in the controller 14, the memory 28 is implemented by a memory.
The detection unit 26 detects the capacitance (capacitance value Cap) generated in the sensor electrode 16 of the touch operation unit 12, and detects a change in the capacitance value Cap.
Various data (capacitance value, time, etc.) set in advance for touch determination using the capacitance value Cap are stored in the memory 28. The memory 28 stores a reference capacitance value Cbase that is a reference value (a reference capacitance value), and a capacitance value Δ Cd that is a difference between capacitance values (hereinafter referred to as a threshold Cth) for setting a threshold value for the reference value (the reference capacitance value Cbase). The threshold value Cth for the reference capacitance value Cbase can be obtained as Cth ═ Cbase + Δ Cd.
The determination unit 30 performs a touch determination as to whether or not the touch operation unit 12 has been touched based on the capacitance value Cap using the data stored in the memory 28, and outputs a determination signal (touch signal) corresponding to the determination result. When capacitance value Cap is equal to or greater than threshold value Cth (reference capacitance value Cbase + capacitance value Δ Cd) (Cap ≧ Cth), determination unit 30 determines that the touch operation has been performed (touch signal ON). When capacitance value Cap is lower than threshold value Cth (Cap < Cth), determination unit 30 determines that the touch panel is in a non-touch state (touch signal OFF).
In the touch detection device 10, the touch operation unit 12 is subjected to a touch operation (long press operation) for a predetermined duration Ts or longer, and the reference capacitance value Cbase is updated. When the touch operation unit 12 (sensor electrode 16) is continuously touched for the duration time Ts or longer, the update unit 32 operates to update the reference capacitance value Cbase stored in the memory 28. In the touch detection device 10, when the reference capacitance value Cbase is updated, the threshold Cth set for the reference capacitance value Cbase is updated.
Next, as an operation of the present embodiment, a touch detection process in the touch detection device 10 and an update process of the reference capacitance value Cbase applied to the touch detection process will be described. The touch detection process executed by the controller 14 in the touch detection apparatus 10 is shown in a flowchart in fig. 3, and the update process of the reference capacitance value Cbase is shown in a flowchart in fig. 4.
The flowchart of fig. 3 is executed by the controller 14 by supplying electric power from a power supply (battery), not shown, of the vehicle 18, and initial setting is performed in the first step 100.
In the touch detection device 10, a predetermined capacitance value Cref which is a predetermined value together with the reference capacitance value Cbase and the capacitance value Δ Cd, a varying capacitance value Cdif1 which is a varying capacitance value and a second capacitance value, and a varying capacitance value Cdif2 which is a varying capacitance value and a first capacitance value are set in advance and stored in the memory 28. The predetermined capacitance value Cref is set to a value (capacitance value) larger than the threshold value Cth (reference capacitance value Cbase + capacitance value Δ Cd), and the maximum value of the capacitance value Cap generated by the touch operation unit 12 being touched by the finger of the passenger is applied in a state where noise or the like is not included. When a parasitic capacitance or the like occurs in the sensor electrode 16, the capacitance value Cap may exceed the predetermined capacitance value Cref.
The reference capacitance value Cbase, the capacitance value Δ Cd, the predetermined capacitance value Cref, and the variation capacitance values Cdif1 and Cdif2 are set when the touch detection device 10 is mounted on the vehicle 18 during manufacture of the touch detection device 10, and the variation capacitance values Cdif1 and Cdif2 are set based on the difference between each of the reference capacitance value Cbase, the capacitance value Δ Cd, and the predetermined capacitance value Cref and each of the capacitance values.
The variable capacitance values Cdif1 and Cdif2 are larger than the electrostatic capacitance values Δ Cd. The variation capacitance value Cdif2 is set to a value larger than the variation capacitance value Cdif1 (Cdif2 > Cdif1 > Δ Cd).
Such change capacitance values Cdif1 and Cdif2 can be set based on the capacitance values (sizes) of the reference capacitance value Cbase, the threshold Cth, and the predetermined capacitance value Cref, the ratio (relative ratio) of the capacitance values, and the like. In addition, the ratio of the capacitance value Cdif1 to Cdif2 may be set to 1: 2, etc.
As a result, as shown in fig. 5A, controller 14 performs initial setting to set reference capacitance value Cbase, threshold value Cth, and predetermined capacitance value Cref.
The initial value of the predetermined capacitance value Cref is stored in the memory 28 as a value set at the time of manufacturing the touch sensing device 10 or at the time of mounting the touch sensing device on the vehicle 18. The predetermined capacitance value Cref stored in the memory 28 is updated at a predetermined timing. In the initial setting of step 100, the value stored in memory 28 is used as predetermined capacitance value Cref. Note that, in fig. 5A, 5B, 6A, and 6B, the horizontal axis is a time axis, and in fig. 5A, 5B, 6A, and 6B, temporal changes in touch operation are shown.
As shown in fig. 3, when the controller 14 performs the initial setting, the touch detection process (touch determination process) is started. In the touch detection process, the controller 14 sequentially executes the operations from step 102 at predetermined time intervals, and the electrostatic capacitance value Cap of the sensor electrode 16 is detected in step 102. In step 104, the controller 14 determines whether or not the detected capacitance value Cap is equal to or greater than a threshold value Cth.
If the finger of the passenger as the operator does not contact touch operation unit 12 and capacitance value Cap does not reach threshold value Cth (Cth < Cap), controller 14 makes a negative determination at step 104 (step 104: no), moves to step 106, and then returns to step 102. The controller 14 sets the touch signal to an OFF state in step 106. Thus, as shown in fig. 5A, while the passenger does not touch the touch operation unit 12, it is determined as a non-touch state, and the off state of the touch signal is continued.
On the other hand, when the passenger touches the touch operation unit 12, the capacitance value Cap increases, and when the capacitance value Cap reaches the threshold value Cth (Cap ≧ Cth), the controller 14 makes an affirmative determination at step 104 (yes at step 104) and proceeds to step 108. In step 108, the touch signal is set to ON (ON).
Thereafter, in step 110, the controller 14 checks whether or not the time at which the capacitance value Cap exceeds the threshold value Cth, that is, the time at which the touch state is determined, reaches the duration Ts. When the finger of the passenger moves away from the touch operation unit 12 and the capacitance value Cap decreases before the duration Ts, the controller 14 makes a negative determination in step 104 and moves to step 106 if the capacitance value Cap is smaller than the threshold Cth. Thereby, the touch signal output from the controller 14 is turned OFF.
In the touch detection device 10, the touch operation unit 12 is provided in the door handle 22, and the controller 14 outputs a touch signal to the door lock device 24 in response to a touch operation on the touch operation unit 12. At this time, if the touch operation unit 12 of the door handle 22 is not touched, the controller 14 turns off the touch signal output to the door lock device 24. Thus, when the touch signal is turned off, the door lock device 24 maintains the lock mechanism in the locked state or the unlocked state, and in the state in which the opening and closing of the side door 20 are restricted, or in the state in which the side door 20 can be opened and closed.
When the touch operation unit 12 of the door handle 22 is touched, the controller 14 turns ON a touch signal to be output to the door lock device 24. Thus, when the lock mechanism is in the locked state, the door lock device 24 switches the lock mechanism to the unlocked state, and the side door 20 can be opened and closed. When the lock mechanism is in the unlocked state, the door lock device 24 switches the lock mechanism to the locked state, and restricts opening and closing of the side door 20.
On the other hand, in the touch detection device 10, when dirt adheres to the door handle 22 on which the touch operation unit 12 is disposed, or when the parasitic capacitance of the sensor electrode 16 of the touch operation unit 12 increases, for example, the capacitance value Cap changes such as increases even in the non-touch state. In this case, the touch detection device 10 is likely to make an erroneous determination of the touch operation. In particular, as shown in fig. 5B, when reference capacitance value Cbase becomes too high and threshold value Cth becomes high, controller 14 erroneously determines that the non-touch state is achieved because capacitance value Cap cannot exceed threshold value Cth regardless of whether a touch operation is performed.
When the touch operation unit 12 is touched, the controller 14 of the touch detection device 10 turns ON the touch signal. The touch operation unit 12 is continuously long-pressed (see fig. 6A and 6B), and detects that the touch operation has been performed for the duration Ts. As a result, controller 14 makes an affirmative determination at step 110 (yes at step 110), and performs an update process of reference capacitance value Cbase (step 112).
Here, the update process of the reference capacitance value Cbase in the controller 14 of the touch detection apparatus 10 will be described with reference to fig. 4, 6A, and 6B. Fig. 6A shows a case where capacitance value Cap after duration Ts has elapsed is equal to or greater than predetermined capacitance value Cref, and fig. 6B shows a case where capacitance value Cap after duration Ts has elapsed is smaller than predetermined capacitance value Cref.
As shown in fig. 6A and 6B, when the occupant stops long-pressing the touch operation unit 12 (the door handle 22) and the finger of the occupant moves away from the sensor electrode 16 after the long-pressing operation is performed, the capacitance value Cap detected by the detection unit 26 decreases.
The update process of reference capacitance value Cbase of fig. 4 is performed, so that controller 14 detects electrostatic capacitance value Cap in initial step 120. In addition, the controller 14 determines whether or not the electrostatic capacitance value Cap starts to decrease in step 122. When the occupant stops long pressing of the touch operation unit 12 (door handle 22) and the capacitance value Cap detected by the detection unit 26 decreases, the controller 14 makes an affirmative determination at step 122 (yes at step 122) and proceeds to step 124.
In step 124, the controller 14 sets the electrostatic capacitance value Cap immediately before the decrease to the initial value C0. That is, the controller 14 sets the capacitance value Cap immediately before the decrease to the initial value C0 of the capacitance value at the time of update.
When the touch operation unit 12 is pressed for a long time, the capacitance value Cap changes as the force (contact area) of contact with the touch operation unit 12 changes. Accordingly, the controller 14 may apply the maximum value of the capacitance value Cap after the duration Ts as the initial value C0.
Further, controller 14 temporarily sets capacitance value Cap (initial value C0) immediately before the decrease as reference capacitance value Cbase. This can increase the threshold Cth, and the controller 14 is restricted from turning ON the touch signal when the reference capacitance value Cbase is updated.
In the next step 126, the controller 14 compares the initial value C0 with the predetermined capacitance value Cref, and checks whether or not the initial value C0 is equal to or greater than the predetermined capacitance value Cref. If the initial value C0 does not reach the predetermined capacitance value Cref (Cth ≦ C0 < Cref, see fig. 6B), the controller 14 makes a negative determination in step 126 (step 126: yes) and proceeds to step 128. In step 128, the controller 14 sets the capacitance value Δ C indicating the change amount to the change capacitance value Cdif 1.
When the initial value C0 becomes equal to or greater than the predetermined capacitance value Cref (C0 ≧ Cref > Cth, see fig. 6A), the controller 14 makes an affirmative determination at step 126 (yes at step 126) and proceeds to step 130. The controller 14 sets the electrostatic capacitance value Δ C to the variation capacitance value Cdif2 in step 130.
When the capacitance value Δ C is set to the variation capacitance value Cdif1 or the variation capacitance value Cdif2 based on the initial value C0 and the predetermined capacitance value Cref, the controller 14 moves to step 132 to detect the capacitance value Cap. In addition, in step 134, the controller 14 determines whether the capacitance value Cap is decreased from the initial value C0 by the capacitance value Δ C, that is, whether the change of the decreased capacitance value Cap reaches the capacitance value Δ C.
If the electrostatic capacitance value Cap is decreased by the electrostatic capacitance value Δ C from the initial value C0 (Cap ≦ (C0- Δ C)), the controller 14 makes an affirmative determination in step 134 (step 134: yes), and moves to step 136. If the decrease in capacitance value Cap from initial value C0 has not reached capacitance value Δ C (Cap > (C0- Δ C)), controller 14 makes a negative determination in step 134 (no in step 134), and proceeds to step 136 to continue detection of a change in capacitance value Cap.
When the routine proceeds to step 136, the controller 14 detects the capacitance value Cap, sets the detected capacitance value Cap as the reference capacitance value Cbase (step 138), stores the set reference capacitance value Cbase in the memory 28, and updates the reference capacitance value Cbase (step 140). Capacitance value Cap set to reference capacitance value Cbase may be a capacitance value Cap obtained after a predetermined time from when the change in capacitance value Cap reaches capacitance value Δ C, or may be the lowest value of capacitance values Cap obtained within a predetermined time.
When the reference capacitance value Cbase is updated, the controller 14 starts the touch detection process by applying the updated reference capacitance value Cbase (see fig. 3).
Here, as shown in fig. 6A, when capacitance value Cap immediately before reduction is equal to or greater than predetermined capacitance value Cref, controller 14 applies, as capacitance value Δ C, variable capacitance value Cdif2 higher than variable capacitance value Cdif 1. Thus, controller 14 can suppress the increase in reference capacitance value Cbase after the update, and can suppress the determination as a non-touch state regardless of whether a touch operation is performed.
As shown in fig. 6B, when capacitance value Cap immediately before reduction is smaller than predetermined capacitance value Cref, controller 14 applies variable capacitance value Cdif1, which is lower than variable capacitance value Cdif2, as capacitance value Δ C. Thus, controller 14 can suppress the situation in which updated reference capacitance value Cbase becomes excessively low, and can suppress the situation in which it is determined that the touch state is the touched state although the touch operation is not performed.
As shown in fig. 6A and 6B, touch determination corresponding to a touch operation can be performed by applying the updated reference capacitance value Cbase. Therefore, in the touch detection device 10, the door lock and the door unlock of the side door 20 can be accurately performed in accordance with the touch operation of the touch operation portion 12 of the door handle 22.
In this way, in the touch detection device 10, the electrostatic capacitance value Cap of the sensor electrode 16 of the touch operation unit 12 detects the touch operation on the touch operation unit 12 using the reference capacitance value Cbase and the threshold Cth set for the reference capacitance value Cbase.
In the touch detection device 10, when the long press operation is performed on the touch operation unit 12, the reference capacitance value Cbase is updated. This enables the touch detection device 10 to update the reference capacitance value Cbase at an arbitrary timing.
At this time, in the touch detection device 10, when the capacitance value Cap when the duration time Ts has elapsed becomes equal to or greater than the predetermined capacitance value Cref set in advance, the capacitance value Cap after the change of the predetermined capacitance value Δ C is set as the reference capacitance value Cbase. Accordingly, in the touch detection device 10, since the reference capacitance value Cbase can be set by securing the capacitance value Δ C with respect to the predetermined capacitance value Cref, the reference capacitance value Cbase can be suppressed from becoming excessively high, and the detection accuracy can be suppressed from decreasing. In addition, in touch detection apparatus 10, it is possible to suppress the time required to update reference capacitance value Cbase from becoming long.
In the touch detection device 10, the capacitance value Δ C when the capacitance value Cap after the elapse of the duration time Ts is smaller than the predetermined capacitance value Cref is set to a value lower than the capacitance value Δ C when the capacitance value Cap is equal to or greater than the predetermined capacitance value Cref. Therefore, in the touch detection device 10, the reference capacitance value Cbase can be suppressed from becoming too low, and the occurrence of erroneous determination due to noise or the like can be suppressed.
In addition, in touch detection device 10, since change capacitance value Cdif1 when capacitance value Cap is smaller than predetermined capacitance value Cref and change capacitance value Cdif2 when capacitance value Cap is equal to or greater than predetermined capacitance value Cref are set in advance, appropriate reference capacitance value Cbase can be easily updated.
In the touch detection device 10, the maximum value of the capacitance value Cap after the duration Ts has elapsed is set as the initial value C0. Thus, in the touch detection device 10, the reference capacitance value Cbase can be appropriately set even if the touch method to the touch operation unit 12 changes.
In the touch detection device 10, the capacitance value Δ C is set to a value larger than the difference between the reference capacitance value Cbase and the threshold value Cth, so that the touch operation of the passenger on the touch operation unit 12 can be detected with high accuracy, and the decrease in the detection accuracy of the touch operation can be further effectively suppressed.
In the touch detection device 10, when the capacitance value Cap after the duration Ts of the long pressing operation on the touch operation unit 12 is smaller than the predetermined capacitance value Cref, the change capacitance value Cdif1 is applied as the capacitance value Δ C, and the reference capacitance value Cbase is updated. However, when capacitance value Cap after duration time Ts of the long pressing operation of touch operation unit 12 is smaller than predetermined capacitance value Cref, reference capacitance value Cbase may not be updated, and only when capacitance value Cap after duration time Ts of the long pressing operation of touch operation unit 12 is equal to or greater than predetermined capacitance value Cref, reference capacitance value Cbase may be updated.
In the above-described embodiment, the mutual capacitance type touch operation unit 12 is described as an example. However, the sensor portion may be of an electrostatic capacitance type, and various structures can be applied to the sensor portion and the sensor electrode applied to the sensor portion.
In the present embodiment, the door lock device 24 is connected to the touch detection device 10, and the side door 20 is locked/unlocked by a touch operation of the touch operation unit 12. However, the touch detection device can be used in connection with various operated devices provided with operated switches and the like, and the touch detection device can operate the operated devices in accordance with detected operations by detecting touch operations to the sensor portions.
The touch detection device may be provided in an air conditioner of a vehicle, and the on/off, the rise/fall of the set temperature, the increase/decrease of the air volume, the switching of the wind direction, and the like of the air conditioner may be performed by a touch operation on the sensor unit. In the case of performing on/off of the air conditioner, a sensor portion is provided at a switch of the air conditioner, and a touch operation of the sensor portion is performed to alternately switch between on and off. In addition, when the set temperature for the air conditioner is increased or decreased, the sensor units are provided on the up switch and the down switch, respectively, so that the set temperature is increased in a predetermined step by touching the up switch, and the set temperature is decreased in a predetermined step by touching the down switch.
The touch detection device may be provided in an audio device of a vehicle, and the touch operation of the sensor unit may be used to turn on/off the audio device, increase/decrease the sound volume, select a radio, switch an audio source, and the like. In the audio apparatus, when switching the audio sources, a sensor unit may be provided in the input selector switch, and the audio sources may be sequentially switched each time the sensor unit is touched.
In the above-described embodiment, the determination process, the update process, and the like that the CPU reads and executes software (program) may be executed by various processors other than the CPU. In this case, the processor includes, for example, a dedicated Circuit or the like having a Circuit configuration specifically designed to execute a Specific process, such as a PLD (Programmable Logic Device) or an ASIC (Application Specific Integrated Circuit) whose Circuit configuration can be changed after manufacture of an FPGA (Field-Programmable Gate Array). The present invention can be executed by one of the various processors described above, or can be executed by a combination of two or more processors of the same type or different types (for example, a plurality of FPGAs, a combination of a CPU and an FPGA, or the like). More specifically, the hardware structure of the various processors is a circuit in which circuit elements such as semiconductor elements are combined.
In the present embodiment, an embodiment in which the programs of the detection process, the determination process, and the update process are stored (installed) in a storage medium (memory) in advance has been described, but the present invention is not limited to this. The program may be provided in the form of a recording medium recorded on a CD-ROM (Compact Disk Read Only Memory), a DVD-ROM (Digital Versatile Disk Read Only Memory), a USB (Universal Serial Bus) Memory, or the like. The program may be downloaded from an external device via a network.
Claims (5)
1. A touch detection device, comprising:
a sensor unit that changes capacitance in the sensor electrode when an operator approaches the sensor electrode;
a detection unit that detects a capacitance value in the sensor electrode;
a determination unit that determines whether or not an operator approaches the sensor unit based on whether or not the capacitance value detected by the detection unit reaches the threshold value, using a preset reference value and a threshold value set for the reference value; and
and an updating unit configured to set the capacitance value as an initial value when the capacitance value after a predetermined elapsed time has elapsed becomes equal to or greater than a predetermined value set in advance in a state where the capacitance value detected by the detecting unit has reached the threshold value, and update the capacitance value after a change in the capacitance value detected by the detecting unit from the initial value reaches a predetermined changed capacitance value as a new reference value.
2. The touch detection device of claim 1,
the updating unit sets the changed capacitance value so as to be smaller than that in a case where the capacitance value after the elapse of the time is equal to or larger than the predetermined value when the capacitance value is smaller than the predetermined value, and updates the capacitance value after the change in the capacitance value detected by the detecting unit from the initial value reaches the changed capacitance value to a new reference value.
3. The touch detection device of claim 2,
a first capacitance value that is the variable capacitance value when the capacitance value after the elapse of the elapsed time is equal to or greater than the predetermined value, and a second capacitance value that is the variable capacitance value when the capacitance value after the elapse of the elapsed time is less than the predetermined value are set in advance.
4. The touch detection device according to any one of claims 1 to 3,
the updating unit sets, as the initial value, a maximum value of the capacitance value from a time when the elapsed time has elapsed to a time when the capacitance value detected by the detecting unit starts to decrease.
5. The touch detection device according to any one of claims 1 to 4,
the variable capacitance value is a capacitance value larger than a difference between the reference value before update and the threshold value.
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| JP2020-073980 | 2020-04-17 | ||
| JP2020073980A JP7436275B2 (en) | 2020-04-17 | 2020-04-17 | touch detection device |
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| CN113535009A true CN113535009A (en) | 2021-10-22 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105320379A (en) * | 2014-06-26 | 2016-02-10 | 株式会社东海理化电机制作所 | Touch-type input device |
| CN107025029A (en) * | 2015-12-14 | 2017-08-08 | 株式会社东海理化电机制作所 | Touch input unit |
| JP2018116631A (en) * | 2017-01-20 | 2018-07-26 | 株式会社東海理化電機製作所 | Touch detection device |
| CN110520831A (en) * | 2017-04-20 | 2019-11-29 | 阿尔卑斯阿尔派株式会社 | Touch sensor formula electronic device and sensor control method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW201122980A (en) | 2009-12-30 | 2011-07-01 | Novatek Microelectronics Corp | Method and apparatus for adjusting touch control parameter |
| JP6351946B2 (en) * | 2013-10-01 | 2018-07-04 | シャープ株式会社 | Mobile terminal and control method |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105320379A (en) * | 2014-06-26 | 2016-02-10 | 株式会社东海理化电机制作所 | Touch-type input device |
| CN107025029A (en) * | 2015-12-14 | 2017-08-08 | 株式会社东海理化电机制作所 | Touch input unit |
| JP2018116631A (en) * | 2017-01-20 | 2018-07-26 | 株式会社東海理化電機製作所 | Touch detection device |
| CN110520831A (en) * | 2017-04-20 | 2019-11-29 | 阿尔卑斯阿尔派株式会社 | Touch sensor formula electronic device and sensor control method |
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| JP7436275B2 (en) | 2024-02-21 |
| JP2021170751A (en) | 2021-10-28 |
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