JP2023122371A - Switching device - Google Patents

Abstract

To determine on/off with high accuracy.SOLUTION: A switch device 1 includes an insulating base material 10, a movable electrode 20 that is arranged on the upper surface 11 side of the insulating base material 10, and has a displacement portion 21 whose position is displaceable with respect to the insulating base material 10, a first electrode 30 and a second electrode 40 which are arranged with at least a part of the insulating base material 10 interposed between them and the movable electrode 20, and a control circuit 50 connected to each of the first electrode 30 and the second electrode 40. The first electrode 30 is arranged at a position facing the displacement portion 21. The second electrode 40 is arranged apart from the first electrode 30. The control circuit 50 applies a first potential to the first electrode 30, and applies a second potential different from the first potential to the second electrode 40 to detect variation of the electrostatic capacitance between the first electrode 30 and the movable electrode 20, and determine on/off based on this detection result.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to switch devices.

Conventionally, capacitive switching devices are known (see Patent Documents 1 to 3, for example).

Japanese Patent Application Laid-Open No. 2007-220473 Japanese Patent No. 5716135 Japanese Patent No. 6667077

However, the above-described conventional switch device has a problem that the accuracy of determination of ON/OFF of the switch is low.

Accordingly, the present disclosure provides a switch device capable of accurately determining ON/OFF.

A switch device according to an aspect of the present disclosure includes an insulating base, a movable electrode disposed on an upper surface side of the insulating base and having a displacement portion capable of displacing a position with respect to the insulating base, and the movable electrode. A first electrode and a second electrode arranged with at least part of the insulating base material sandwiched therebetween, and a control circuit connected to each of the first electrode and the second electrode. The first electrode is arranged at a position facing the displacement portion. The second electrode is spaced apart from the first electrode. The control circuit applies a first potential to the first electrode and a second potential different from the first potential to the second electrode, so that at least the first electrode and the movable electrode are connected. A change in the capacitance value of the capacitance between the electrodes is detected, and ON/OFF determination is performed based on this detection result.

According to the present disclosure, ON/OFF can be determined with high accuracy.

FIG. 1 is a cross-sectional view showing the configuration (OFF) of the switch device according to Embodiment 1. FIG. FIG. 2 is a cross-sectional view showing the configuration (on) of the switch device according to the first embodiment. FIG. 3 is a graph showing the capacitance value and the reaction force applied to the operating body with respect to the pushing amount of the movable electrode. 4 is a cross-sectional view showing a configuration of a switch device according to a modification of Embodiment 1. FIG. FIG. 5 is a cross-sectional view showing the configuration of the switch device according to the second embodiment. 6 is a cross-sectional view showing the configuration of a switch device according to Modification 1 of Embodiment 2. FIG. 7 is a cross-sectional view showing a configuration of a switch device according to Modification 2 of Embodiment 2. FIG. FIG. 8 is a cross-sectional view showing the configuration of a switch device according to Modification 3 of Embodiment 2. As shown in FIG. FIG. 9 is a cross-sectional view showing the configuration of the switch device according to the third embodiment. FIG. 10 is a flow chart showing the operation of the switch device according to the third embodiment. 11 is a perspective view of a switch device according to the first embodiment; FIG. 12 is an exploded perspective view of the switch device according to the first embodiment. FIG. 13 is a perspective view of the first electrode and the second electrode of the switch device according to the first embodiment; FIG. FIG. 14 is a perspective view of a switch device according to a second embodiment; FIG. 15 is an exploded perspective view of the switch device according to the second embodiment. FIG. 16 is a perspective view showing a base and first and second electrodes of a switch device according to Example 2. FIG. FIG. 17 is a cross-sectional view of a switch device according to a second embodiment; FIG. 18 is a cross-sectional view showing the configuration of a switch device according to a modification of each embodiment.

(Findings on which this disclosure is based)
The inventors of the present invention have found that the conventional switch device described in the "Background Art" section has the following problems.

The switch devices disclosed in Patent Documents 1 and 2 detect changes in capacitance that occur between a person's finger and an electrode. However, the capacitance between the finger and the electrode depends on the moisture status of the finger, such as the presence or absence of perspiration, or whether the finger is dry or wet. In addition, the capacitance between the finger and the electrode also depends on the shape of the finger at the time of pressing or how it is pressed. For example, the amount of change in capacitance is different when pressing with the pad of the finger and when pressing with the tip of the finger. For this reason, the capacitance is not stable due to individual differences and state differences, so the accuracy of ON/OFF determination is lowered.

In addition, in the switch device disclosed in Patent Document 3, each capacitance varies between the switch electrode and the conductor integrally interlocked with the push button via the elastic body and between the conductor and the ground electrode. The change affects the on/off capacitance measurement of the switch by the switch electrodes. Therefore, the measured capacitance value is not stable depending on the pressing direction of the operator. As a result, the accuracy of ON/OFF determination is lowered.

Accordingly, the present disclosure provides a switch device capable of accurately determining ON/OFF.

For example, a switch device according to an aspect of the present disclosure includes an insulating base, a movable electrode disposed on an upper surface side of the insulating base and having a displacement portion capable of displacing a position with respect to the insulating base, and the movable electrode and a control circuit connected to each of the first electrode and the second electrode. The first electrode is arranged at a position facing the displacement portion. The second electrode is spaced apart from the first electrode. The control circuit applies a first potential to the first electrode and a second potential different from the first potential to the second electrode, so that at least the first electrode and the movable electrode are connected. A change in the capacitance value of the capacitance between the electrodes is detected, and ON/OFF determination is performed based on this detection result.

As a result, the potential of the movable electrode is fixed by capacitive coupling with the second electrode when the first electrode is charged when measuring the capacitance between the first electrode and the movable electrode. For this reason, it is possible to suppress the influence of the capacitance with the operating body, the variation in the pressing direction, and the influence of noise from the outside. This makes it possible to determine on/off with high accuracy. In addition, since direct electrical connection to the movable electrode is not required, it is possible to eliminate the influence of defective conduction or short circuit of the movable electrode due to foreign matter such as dust. Therefore, the reliability of the switch device can be improved.

Further, for example, the control circuit may connect the second potential to a ground potential when charging the first electrode.

Thus, when the first electrode is charged during measurement of the capacitance between the first electrode and the movable electrode, the potential of the movable electrode is fixed via the second electrode to which the ground potential is applied. Therefore, ON/OFF can be determined with high accuracy.

Further, for example, the control circuit may connect the first potential to a ground potential during discharging from the first electrode.

As a result, the charged charge can be quickly discharged, and the period until the next sensing can be shortened. Therefore, since the number of scans can be increased, detection accuracy can be improved.

Also, for example, the movable electrode may have a first enlarged portion extending along the upper surface of the insulating base. The second electrode may be arranged at a position facing the first enlarged portion.

As a result, the capacitive coupling between the movable electrode and the second electrode can be strengthened, so that the potential of the movable electrode can be fixed more strongly. Therefore, ON/OFF can be determined with high accuracy.

Further, for example, the movable electrode may generate a click feeling with respect to the operating body when the operating body pushes the displacement portion downward. The control circuit may make the determination when the click feeling is generated. Note that the time when the click feeling is generated is a period from when the reaction force of the displacement portion to the operating body reaches a maximum value to when it comes closest to the insulating base material.

As a result, it is possible to set the ON/OFF determination at the time of the click feeling given to the operating body at the optimum timing, and it is possible to realize a switch operation with a good operational feeling.

Further, for example, the second electrode may have a second enlarged portion extending outside the movable electrode in plan view. The area of the second enlarged portion may be equal to or larger than the area where the second electrode and the movable electrode overlap in plan view. The control circuit may detect a change in capacitance value of the capacitance between the second electrode and the manipulation body, and detect the approach of the manipulation body based on the detection result.

Thereby, the approach of the operating body can be detected before the operating body pushes the displacement portion of the movable electrode. For example, the operation mode can be changed based on the detection result of the approach of the operating body.

Further, for example, the control circuit may detect the approach of the operating body in a state in which the first potential and the second potential are connected to equal potentials.

As a result, there is no charge transfer between the first electrode and the second electrode, so that the apparent capacitance component can be reduced to zero. The capacitance component between the first electrode and the second electrode becomes noise when detecting the approach of the operating body. In other words, since noise can be suppressed, the detection sensitivity of the second electrode that detects the proximity of the operating body can be increased, and the detection accuracy can be increased.

Further, for example, the control circuit may have a detection mode for detecting the approach of the operating body and a determination mode for performing the determination. The detection mode may be switched to the determination mode when the approach of the operating body is detected in the detection mode. For example, the scan speed in the detection mode may be lower than the scan speed in the determination mode.

Thereby, power consumption can be reduced in the detection mode. In the determination mode, it is possible to improve the accuracy of ON/OFF determination. By switching the operation mode based on the detection result of the approach of the operating object, it is possible to improve the accuracy of ON/OFF determination and reduce the power consumption.

Embodiments will be specifically described below with reference to the drawings.

It should be noted that the embodiments described below are all comprehensive or specific examples. Numerical values, shapes, materials, components, arrangement positions and connection forms of components, steps, order of steps, and the like shown in the following embodiments are examples, and are not intended to limit the present disclosure. Further, among the constituent elements in the following embodiments, constituent elements not described in independent claims will be described as optional constituent elements.

Each figure is a schematic diagram and is not necessarily strictly illustrated. Therefore, for example, scales and the like do not necessarily match in each drawing. Moreover, in each figure, substantially the same configurations are denoted by the same reference numerals, and overlapping descriptions are omitted or simplified.

Also, in this specification, terms that indicate the relationship between elements such as parallel or perpendicular, terms that indicate the shape of elements such as circular, and numerical ranges are not expressions that express only strict meanings, but substantial It is an expression that means that a difference of approximately several percent is also included, for example, a range equivalent to each other.

Also, in this specification, the terms “upper” and “lower” do not refer to the upward (vertically upward) and downward (vertically downward) directions in absolute spatial recognition, but rather to the relative position of each electrode. Used as a term defined by a relationship. Specifically, with respect to the insulating substrate, the side on which the movable electrode is arranged is referred to as the "upper side" or "upper side," and the side on which the first electrode and the second electrode are arranged is referred to as the "lower side" or "lower side." and Also, the terms "above" and "below" are used not only when two components are spaced apart from each other and there is another component between the two components, but also when two components are spaced apart from each other. It also applies when two components are in contact with each other and are placed in close contact with each other.

In addition, in this specification and drawings, x-axis, y-axis and z-axis indicate three axes of a three-dimensional orthogonal coordinate system. The direction orthogonal to the main surface of the insulating base is taken as the z-axis direction.

In addition, in this specification, ordinal numbers such as “first” and “second” do not mean the number or order of constituent elements unless otherwise specified, so as to avoid confusion between constituent elements of the same kind and to distinguish between them. It is used for the purpose of

(Embodiment 1)
[composition]
First, the configuration of the switch device according to Embodiment 1 will be described with reference to FIGS. 1 and 2. FIG. FIG. 1 is a cross-sectional view showing the configuration (OFF) of a switch device 1 according to this embodiment. FIG. 2 is a cross-sectional view showing the configuration (on) of the switch device 1 according to this embodiment.

As shown in FIGS. 1 and 2, the switch device 1 is switched on/off by pushing the movable electrode 20 with the operation body 90 . OFF is a state in which the amount of pressing of the movable electrode 20 by the operating body 90 is less than the threshold. ON is a state in which the amount of pressing of the movable electrode 20 by the operating body 90 is equal to or greater than the threshold.

The operating body 90 is, for example, a human finger, but is not limited to this. The operating body 90 may be a rod-shaped member such as a touch pen or a block-shaped member having a predetermined shape. The operating body 90 may be an insulator.

As shown in FIGS. 1 and 2, the switch device 1 includes an insulating substrate 10, a movable electrode 20, a first electrode 30, a second electrode 40, and a control circuit 50. FIG.

The insulating base material 10 is a plate-like member having insulating properties. For example, the insulating base material 10 is a resin sheet or resin film formed using an insulating resin. Insulating substrate 10 has a top surface 11 and a bottom surface 12 . The upper surface 11 and the lower surface 12 are surfaces parallel to each other, for example.

The movable electrode 20 is arranged on the upper surface 11 side of the insulating base material 10 . The movable electrode 20 has a displacement portion 21 . The displacement part 21 is a part whose position relative to the insulating base material 10 can be displaced. The displacement portion 21 changes its position when it is pushed into the operation body 90 .

In the present embodiment, the movable electrode 20 is formed in a dome shape that protrudes upward when the operating body 90 is not pressed. The movable electrode 20 is, for example, a metal dome made of metal. A displacement portion 21 is a portion of the movable electrode 20 that is the farthest from the upper surface 11 of the insulating base material 10 (specifically, the central portion in a plan view). An end portion of the movable electrode 20 is fixed to the upper surface 11 of the insulating base material 10 . As the displacement portion 21 is pushed by the operation body 90, the displacement portion 21 is gradually deformed, and when the reaction force value with respect to the pushing amount first exceeds the maximum value, the movable electrode 20 is reversed as shown in FIG. shape, and the pushed portion (displacement portion 21) is dented.

The movable electrode 20 generates a click feeling with respect to the operating body 90 when the operating body 90 pushes the displacement portion 21 downward. A click feeling is generated by a change in the reaction force that the movable electrode 20 gives to the operating body 90 with respect to the pressing force of the operating body 90 . The relationship between the pushing amount and the reaction force will be explained later.

The first electrode 30 and the movable electrode 20 are arranged with at least part of the insulating base material 10 interposed therebetween. Specifically, the first electrode 30 is arranged on the lower surface 12 side of the insulating base material 10 . More specifically, first electrode 30 is a conductive thin film disposed in contact with lower surface 12 . The first electrode 30 is arranged at a position facing the displacement portion 21 of the movable electrode 20 . That is, at least a portion of the first electrode 30 overlaps the displacement portion 21 in plan view of the upper surface 11 or the lower surface 12 . Since at least part of the insulating base material 10 is arranged between the first electrode 30 and the displacement portion 21, the first electrode 30 and the displacement portion 21 do not come into contact with each other even if the displacement portion 21 is displaced.

The capacitance value of the electrostatic capacitance C<b>1 between the first electrode 30 and the displacement portion 21 of the movable electrode 20 changes according to the displacement of the displacement portion 21 . Specifically, as the displacement portion 21 approaches the first electrode 30, the capacitance value of the electrostatic capacitance C1 increases.

The second electrode 40 is arranged with at least part of the insulating base material 10 sandwiched between the second electrode 40 and the movable electrode 20 . Specifically, the second electrode 40 is arranged on the lower surface 12 side of the insulating base material 10 . More specifically, second electrode 40 is a conductive thin film disposed in contact with lower surface 12 . The second electrode 40 is arranged at a position facing the movable electrode 20 away from the first electrode 30 . Specifically, the second electrode 40 is arranged at a fixed portion of the movable electrode 20 , that is, at a position facing the end portion of the movable electrode 20 . When the movable electrode 20 is fixed annularly along the outer shape in plan view, the second electrode 40 is annularly formed surrounding the first electrode 30 . Since at least part of the insulating base material 10 is arranged between the second electrode 40 and the movable electrode 20, the second electrode 40 and the movable electrode 20 are not in contact with each other.

The capacitance value of the electrostatic capacitance C2 between the second electrode 40 and the movable electrode 20 is substantially fixed. This is because the portion of the movable electrode 20 facing the second electrode 40 (the end portion of the movable electrode 20) is not substantially displaced. By applying a predetermined potential to the second electrode 40 , the potential of the movable electrode 20 can be fixed by capacitive coupling between the movable electrode 20 and the second electrode 40 . In other words, it is possible to prevent the potential of the movable electrode 20 from fluctuating due to the depression of the operating body 90 .

Each of the first electrode 30 and the second electrode 40 is a conductive thin film formed using a metal material such as silver or copper. The first electrode 30 and the second electrode 40 may be formed using conductive carbon or the like. The first electrode 30 and the second electrode 40 can be formed by printing, vapor deposition, sputtering, adhesion of a rolled metal thin film, or the like.

A control circuit 50 is connected to each of the first electrode 30 and the second electrode 40 . The control circuit 50 applies a first potential to the first electrode 30 and a second potential to the second electrode 40 . The first potential and the second potential are potentials different from each other. As described above, the potential of the movable electrode 20 is fixed by applying the second potential to the second electrode 40 . The potential difference between the first electrode 30 and the movable electrode 20 can create a charge/discharge situation between the first electrode 30 and the movable electrode 20 . For example, the control circuit 50 connects the second potential to the ground potential when charging the first electrode 30 . Also, the control circuit 50 connects the first potential to the ground potential when discharging from the first electrode 30 .

The control circuit 50 detects a change in the capacitance value of the electrostatic capacitor C1, and determines on/off (on or off) based on this detection result. Specific determination processing will be described later.

The control circuit 50 is realized by, for example, an LSI (Large Scale Integration), which is an integrated circuit (IC). Note that the integrated circuit is not limited to an LSI, and may be a dedicated circuit or a general-purpose processor. The control circuit 50 is implemented, for example, by a microcontroller. Specifically, the control circuit 50 includes a nonvolatile memory storing a program, a volatile memory serving as a temporary storage area for executing the program, an input/output port, a processor executing the program, and the like. I'm in. The control circuit 50 may be a programmable FPGA (Field Programmable Gate Array) or a reconfigurable processor in which connection and setting of circuit cells in the LSI can be reconfigured. The functions executed by the control circuit 50 may be realized by software or by hardware.

1 and 2, the control circuit 50 is illustrated as a functional block rather than as a cross section of a physical configuration. The control circuit 50 is fixed to the insulating substrate 10, for example. Alternatively, the control circuit 50 may be housed inside a housing (not shown) housing the insulating base 10, or may be attached to the outer surface thereof.

[motion]
Next, the operation of the switch device 1 according to this embodiment will be described with reference to FIG.

FIG. 3 is a graph showing the capacitance value and the reaction force applied to the operation body 90 with respect to the pushing amount of the movable electrode 20. As shown in FIG. The horizontal axis of FIG. 3 represents the pushing amount of the movable electrode 20, that is, the amount of displacement of the displacement portion 21. As shown in FIG. The state where the pushing amount is 0 mm corresponds to the state shown in FIG. 1, and the pushing amount end point corresponds to the state shown in FIG. The vertical axis on the left side of FIG. 3 is the capacitance value of the electrostatic capacitance C1 between the movable electrode 20 and the first electrode 30. As shown in FIG. The vertical axis on the right side of FIG. 3 represents the reaction load applied to the operating body 90 by the movable electrode 20 .

As indicated by the broken line graph in FIG. 3, the reaction force applied to the operating body 90 increases as the amount of depression increases, reaches a maximum (peak) immediately before the shape is reversed, and decreases after the reverse. Therefore, the operating body 90 receives a click feeling during the period from when the reaction force reaches its peak to when it comes closest to or abuts on the insulating base material 10 . It is desirable to determine whether the switch device 1 is on or off within the period during which the click feeling is generated. In the present embodiment, the control circuit 50 performs ON/OFF determination during the period from when the click feeling is generated until the displacement portion 21 comes closest to or comes into contact with the insulating base material 10 . Specifically, as shown in FIG. 3, the ON/OFF judgment area is set to the area from the amount of pushing when the reaction force reaches its peak to the end point of the amount of pushing. there is The end point of the pushing amount corresponds to the maximum pushing amount, for example, the pushing amount when the displacement portion 21 comes into contact with the upper surface 11 of the insulating base 10 (see FIG. 2).

In the present embodiment, the control circuit 50 calculates the capacitance value of the electrostatic capacitance C1 between at least the first electrode 30 and the movable electrode 20 by measuring the amount of charge flowing into the first electrode 30, On/off determination is performed based on the result. For example, the control circuit 50 compares the calculated capacitance value of the capacitance C1 with a predetermined threshold value, and determines that the capacitance value of the capacitance C1 is turned on when the capacitance value of the capacitance C1 is greater than the threshold value. The control circuit 50 determines that it is not turned on (off) when the capacitance value of the capacitance C1 is smaller than the threshold.

As shown in the solid line graph in FIG. 3, as the pushing amount increases, the displacement portion 21 approaches the first electrode 30, so the capacitance value of the capacitance C1 increases. The threshold for ON/OFF determination is a threshold for comparison with the capacitance value of the capacitance C1, and is set, for example, so as to intersect the solid line graph within the ON/OFF determination region. Specifically, the threshold value is set to be equal to or greater than the capacitance value (approximately 7.5×10 ⁻¹² ) at the pressing amount (approximately 0.27) at which the reaction force peaks, and the maximum possible capacitance value of the electrostatic capacitance C1. It is set within a range of a value (approximately 3.4×10 ⁻¹¹ ) or less. By setting the threshold to a value close to the lower limit of the range, it is possible to make an ON determination at an early point in the period during which the operating body 90 receives the click feeling. Therefore, the switch operation can be performed with less delay in response to the operation. On the other hand, when the threshold value is set to a value close to the upper limit of the range, the time required for the reaction increases compared to the setting, but the on/off determination is based on the variation in the capacitance value of the capacitance C1. A decrease in accuracy can be suppressed.

Depending on the type of the movable electrode 20, after the reaction force reaches its peak, the reaction force may not only gradually decrease to the maximum value of the pushing amount, but also may increase near the maximum pushing amount. be. In either case, ON/OFF determination is possible based on the capacitance value of the capacitance C1.

In this embodiment, the control circuit 50 repeatedly charges and discharges the first electrode 30 . During charging, the control circuit 50 applies a potential lower than the potential applied to the first electrode 30 to the second electrode 40 . For example, during charging, the control circuit 50 applies a ground potential to the second electrode 40 and applies a potential higher than the ground potential to the first electrode 30 . When the displacement portion 21 of the movable electrode 20 is pushed during charging, the capacitance value of the electrostatic capacitance C1 increases, so the amount of charge flowing into the first electrode 30 also increases. The control circuit 50 measures the amount of change in the amount of charge flowing into the first electrode 30 caused by the change in the capacitance C1 during charging. The control circuit 50 can calculate the capacitance value of the electrostatic capacitance C1 based on the measurement result of the change amount of the charge amount.

The control circuit 50 discharges after the charging period. Specifically, the control circuit 50 applies the ground potential to the first electrode 30 during discharging. Also, the control circuit 50 applies a predetermined potential to the second electrode 40 during discharging. The predetermined potential is, for example, the ground potential, but may be a positive potential, which can be set based on discharge conditions and the like.

In this embodiment, during charging, the potential of the movable electrode 20 is fixed via the second electrode 40 to which the ground potential is applied. Therefore, the capacitance with the operating body 90 and the influence of noise from the outside can be suppressed. This makes it possible to determine on/off with high accuracy. In addition, since direct electrical connection to the movable electrode 20 is no longer necessary, the influence of defective conduction or short circuit of the movable electrode 20 due to foreign matter such as dust can be eliminated. Therefore, the reliability of the switch device 1 can be improved.

[Modification]
Next, a modification of Embodiment 1 will be described with reference to FIG. FIG. 4 is a cross-sectional view showing the configuration of a switch device 2 according to this modification.

As shown in FIG. 4, the switch device 2 is different from the switch device 1 shown in FIG. differ. The following description focuses on the differences from the first embodiment, and omits or simplifies the description of the common points.

The flexible film 60 is a film member having an upwardly convex dome-shaped portion. A movable electrode 20a along the dome shape is provided on the lower surface (rear surface) of the dome-shaped portion.

The movable electrode 20 a is a conductive layer provided on the bottom surface of the flexible film 60 . As in the first embodiment, it is formed in an upwardly convex dome shape. For example, the movable electrode 20a is formed by applying a conductive material such as silver ink by printing or the like.

The end portion of the movable electrode 20a that faces the second electrode 40 is not in contact with the upper surface 11 of the insulating base material 10, but is not limited to this. Movable electrode 20 a may be in contact with upper surface 11 as in the first embodiment.

By pushing the dome-shaped portion of the flexible film 60 into the operation body 90, the shape of the dome-shaped portion is reversed. Thereby, the movable electrode 20a can achieve the same function as the movable electrode 20 according to the first embodiment.

The flexible film 60 has insulating properties. Even if an electric current flows through the movable electrode 20a for some reason, the electric current can be suppressed from flowing through the operating body 90. FIG. The flexible film 60 also functions as a protective member for the movable electrode 20a.

The adhesive layer 70 is an example of a member that fixes the flexible film 60 to the upper surface 11 of the insulating base material 10 . The adhesive layer 70 is formed by applying an adhesive or adhesive to the top surface 11 . Note that the means for fixing the flexible film 60 is not limited to the adhesive layer 70 .

In the switch device 2 as described above, similarly to the first embodiment, ON/OFF can be determined with high accuracy.

(Embodiment 2)
Next, Embodiment 2 will be described.

The switch device according to the second embodiment differs from the switch device according to the first embodiment in that the movable electrode has an enlarged portion extending along the upper surface of the insulating base. In the following, the description will focus on the differences from the first embodiment, and the description of the common points may be omitted or simplified.

[composition]
FIG. 5 is a cross-sectional view showing the configuration of the switch device 101 according to this embodiment. As shown in FIG. 5, the switch device 101 comprises a movable electrode 120 instead of the movable electrode 20 compared to the switch device 1 shown in FIG.

The movable electrode 120 has an enlarged portion 122 . The enlarged portion 122 is an example of a first enlarged portion extending along the upper surface 11 of the insulating base material 10 . For example, the enlarged portion 122 is annularly provided along the edge of the dome-shaped portion including the displacement portion 21 . The enlarged portion 122 is arranged at a position facing the second electrode 40 in plan view.

Since the enlarged portion 122 is provided in this way, the overlapping area between the enlarged portion 122 and the second electrode 40 in plan view increases. Therefore, the capacitive coupling between the enlarged portion 122 and the second electrode 40 is strengthened, and the potential of the movable electrode 120 is strongly fixed. The influence of noise can be suppressed, and the accuracy of ON/OFF determination can be improved.

[Modification 1]
Next, Modification 1 of Embodiment 2 will be described with reference to FIG.

FIG. 6 is a cross-sectional view showing the configuration of a switch device 102 according to this modification. As shown in FIG. 6, switch device 102 includes movable electrode 120a, flexible film 60 and adhesive layer 70 instead of movable electrode 120, compared to switch device 101 shown in FIG.

Movable electrode 120a is a conductive layer provided on the lower surface (back surface) of the dome-shaped portion of flexible film 60, as in switch device 2 according to the modification of the first embodiment. The conductive layer extends outwardly along the edges of the dome-shaped portion as well as the portion. The enlarged portion of the conductive layer is the enlarged portion 122a.

Since the enlarged portion 122a is provided, the overlapping area between the enlarged portion 122a and the second electrode 40 in plan view increases. Therefore, the capacitive coupling between the enlarged portion 122a and the second electrode 40 is strengthened, and the potential of the movable electrode 120a is strongly fixed. The influence of noise can be suppressed, and the accuracy of ON/OFF determination can be improved.

In this modified example, the adhesive layer 70 covers the enlarged portion 122a, but is not limited to this. The adhesive layer 70 does not have to be arranged between the enlarged portion 122 a and the insulating base material 10 . The enlarged portion 122 a may be in contact with the insulating base material 10 . In this case, since the distance between the enlarged portion 122a and the second electrode 40 is shortened, the capacitive coupling can be made stronger, and the potential of the movable electrode 120a can be fixed strongly. Therefore, the influence of noise can be suppressed, and the accuracy of ON/OFF determination can be improved.

[Modification 2]
Next, Modification 2 of Embodiment 2 will be described with reference to FIG.

FIG. 7 is a cross-sectional view showing the configuration of a switch device 103 according to this modification. As shown in FIG. 7, the switch device 103 comprises a movable electrode 120b instead of the movable electrode 120 compared to the switch device 101 shown in FIG.

The movable electrode 120b includes a dome-shaped metal member 120c and a conductive layer 120d. The metal member 120c is, for example, a dome-shaped metal dome convex upward, and is the same as the movable electrode 20 of the first embodiment. 120 d of conductive layers are provided along the lower surface of the flexible film 60 like the modification 1 of Embodiment 2, and form the enlarged part 122a. The conductive layer 120d is in contact with the metal member 120c and electrically connected. That is, the conductive layer 120d and the metal member 120c have substantially the same potential.

In the example shown in FIG. 7, the conductive layer 120d is not provided on the top portion of the metal member 120c, specifically, on the displacement portion 21, but the present invention is not limited to this. The conductive layer 120d may be formed in a dome shape like the movable electrode 120a of the first modification of the second embodiment.

Also in the switch device 103 according to this modified example, similarly to the second embodiment, the enlarged portion 122a can strongly fix the potential of the movable electrode 120b. Therefore, the influence of noise can be suppressed, and the accuracy of ON/OFF determination can be improved.

[Modification 3]
Next, Modification 3 of Embodiment 2 will be described with reference to FIG.

FIG. 8 is a cross-sectional view showing the configuration of a switch device 104 according to this modification. As shown in FIG. 8, the switch device 104 comprises a movable electrode 120e instead of the movable electrode 120 compared to the switch device 101 shown in FIG.

The movable electrode 120e has a flat top portion (displacement portion 121e). The movable electrode 120 e has a displacement portion 121 e and an enlarged portion 122 . The displacement portion 121 e is positioned apart from the upper surface 11 of the insulating base 10 and is displaced with respect to the upper surface 11 when pushed into the operation body 90 .

In this modified example, the peak of the reaction force applied to the operating body 90 by the displacement portion 121e is substantially when the pushing amount of the displacement portion 121e is maximized. Therefore, the threshold value for ON/OFF determination can be set to, for example, the capacitance value of the electrostatic capacitance C1 when the pushing amount of the displacement portion 121e is maximized.

Also in the switch device 104 according to this modified example, the potential of the movable electrode 120e can be strongly fixed by the enlarged portion 122, as in the second embodiment. Therefore, the influence of noise can be suppressed, and the accuracy of ON/OFF determination can be improved.

(Embodiment 3)
Next, Embodiment 3 will be described.

The switch device according to the third embodiment differs from the switch device according to the modified example of the first embodiment in that the second electrode has an enlarged portion extending outside the movable electrode. In the following, the description will focus on the differences from the first embodiment, and the description of the common points may be omitted or simplified.

[composition]
FIG. 9 is a cross-sectional view showing the configuration of the switch device 201 according to this embodiment. As shown in FIG. 9, the switch device 201 comprises a second electrode 240 instead of the second electrode 40 compared to the switch device 1 shown in FIG. Switch device 201 also includes flexible film 60 and adhesive layer 70 .

Flexible film 60 and adhesive layer 70 are substantially the same as flexible film 60 and adhesive layer 70 according to the modification of the first embodiment, respectively. In this embodiment, the adhesive layer 70 is also provided between the flexible film 60 and the movable electrode 20 . Instead of the movable electrode 20, a movable electrode 20a according to the modification of the first embodiment may be provided. In addition, the flexible film 60 and the adhesive layer 70 are not essential components.

The second electrode 240 has an enlarged portion 241 . The enlarged portion 241 is an example of a second enlarged portion extending outside the movable electrode 20 in plan view. The enlarged portion 241 is used to detect the approach of the operating body 90 to the movable electrode 20 . The area of the enlarged portion 241 is greater than or equal to the area where the second electrode 240 and the movable electrode 20 overlap in plan view. The larger the area of the enlarged portion 241, the wider the detection range of the approach of the operating body 90 can be secured.

In switch device 201 according to the present embodiment, control circuit 50 has a plurality of operation modes. Specifically, the control circuit 50 has, as operation modes, a determination mode for determining ON/OFF and a detection mode for detecting the approach of the operating body 90 . Since the detection mode contributes to power saving as described later, it is also called a power saving mode. Since the determination mode is a normal operation of the switch device 201, it is also called a normal mode.

The scan speed in detection mode is slower than the scan speed in determination mode. Note that the scan speed is the number of repetitions of charging and discharging the capacitance C1 per unit time. In the determination mode with a high scanning speed, the number of charge/discharge repetitions per unit time increases, so highly accurate determination becomes possible. In the detection mode in which the scan speed is low, the number of charge/discharge repetitions per unit time is small, so power consumption can be reduced. Having the detection mode enables power saving of the switch device 201 .

In the detection mode, the control circuit 50 detects changes in the capacitance value of the electrostatic capacitance C3 generated between the second electrode 240 and the operating body 90. FIG. Specifically, the control circuit 50 repeatedly charges and discharges the second electrode 240 . During charging, the control circuit 50 applies a predetermined potential different from the ground potential to the second electrode 240 .

When the operating body 90 approaches the second electrode 240 during charging, the capacitance value of the electrostatic capacitance C3 between the second electrode 240 and the operating body 90 increases, so the amount of charge flowing into the second electrode 240 also increases. Become. The control circuit 50 measures the amount of change in the amount of charge flowing into the second electrode 240 caused by the change in the capacitance value of the electrostatic capacitor C3 during charging. That is, the charging period is the sensing period of the switch device 201, that is, the period during which the approach of the operating body 90 can be detected. The control circuit 50 compares the capacitance value of the electrostatic capacitance C3 with a predetermined threshold value for the operating tool 90, and determines that the approach of the operating tool 90 has been detected when the capacitance value of the electrostatic capacitance C3 is greater than the threshold value. do. The control circuit 50 determines that the operating body 90 is not approaching when the capacitance value of the electrostatic capacitance C3 is smaller than the threshold.

In sensing mode, the control circuit 50 discharges after a period of charging. Specifically, the control circuit 50 applies the ground potential to the second electrode 240 .

In the detection mode, the control circuit 50 may apply a fixed potential other than the ground potential to the first electrode 30 during charging. Alternatively, the control circuit 50 may put the first electrode 30 in a floating state without applying a potential to the first electrode 30 .

Also, the control circuit 50 may apply the same potential as the potential applied to the second electrode 240 to the first electrode 30 . Thereby, the apparent capacitance component between the first electrode 30 and the second electrode 240 can be canceled. The capacitance component is a noise component for the electrostatic capacitance C3 between the second electrode 240 and the operating body 90. Since this noise component can be reduced, the detection accuracy of the operating tool 90 can be improved.

[motion]
Next, the operation of switch device 201 according to the present embodiment will be described with reference to FIG. FIG. 10 is a flow chart showing the operation of the switch device 201 according to this embodiment.

As shown in FIG. 10, the control circuit 50 first places the second electrode 240 in the high-speed scan mode, and operates the first electrode 30 in the high-speed scan mode at least once (S10). Specifically, the control circuit 50 repeats charging and discharging by applying a predetermined potential to the first electrode 30 and the second electrode 240, so that the amount of change in the amount of charge flowing into the second electrode 240 during charging and The amount of change in the amount of charge flowing into the first electrode 30 is measured. The amount of charge flowing into each electrode can be measured using, for example, a scan interval. By operating the first electrode 30 in the high-speed scan mode at the start, even when the movable electrode 20 is pushed almost at the same time as the start, it is possible to perform ON/OFF determination with high accuracy.

It is desirable that the second electrode 240 is scanned at high speed at the start, but if only the first electrode 30 is scanned at high speed, the second electrode 240 does not necessarily need to be scanned at high speed.

If there is no reaction (No in S12), that is, if the capacitance value of the electrostatic capacitance C3 corresponding to the amount of charge flowing into the second electrode 240 is less than the threshold, the control circuit 50 shifts to the detection mode (S14). . In addition, when the detection mode is being executed, the detection mode is maintained as it is. In sensing mode, the first electrode 30 is operated in slow scan mode.

If there is a reaction (Yes in S12), that is, if the capacitance value of the electrostatic capacitance C3 corresponding to the amount of charge flowing into the second electrode 240 is equal to or greater than the threshold, the control circuit 50 shifts to determination mode (normal mode). do. In the determination mode according to the present embodiment, the approach of the operating body 90 and the on/off determination of the movable electrode 20 by the operating body 90 are performed.

Specifically, when there is a reaction (Yes in S12), the control circuit 50 scans the second electrode 240 at high speed (S16). Further, the control circuit 50 scans the first electrode 30 at high speed (S18). The scan speed for each of the second electrode 240 and the first electrode 30 is higher than the scan speed in sensing mode.

Note that it is not always necessary to scan the second electrode 240 at high speed. That is, step S16 may be omitted.

As long as the approach of the operating body 90 and the pressing of the operating body 90 against the movable electrode 20 are detected (Yes in S12), the determination mode is maintained. When the approach of the operating body 90 and the pressing of the operating body 90 against the movable electrode 20 are no longer detected (No in S12), the detection mode is shifted to the detection mode until the approach of the operating body 90 is detected again. is maintained.

As described above, in the switch device 201 according to the present embodiment, the control circuit 50 switches from the detection mode to the determination mode when the approach of the operating tool 90 is detected in the detection mode. That is, the control circuit 50 switches the scanning speed for the second electrode 240 from low speed to high speed. As a result, it is possible to accurately detect the operation on the movable electrode 20 and to accurately determine whether the electrode is on or off. In addition, when the approach of the operating body 90 is not detected, the scan speed is reduced, thereby reducing power consumption and contributing to energy saving.

In addition, although the example in which the second electrode 240 has the enlarged portion 241 is shown in the present embodiment, the present invention is not limited to this. The enlarged portion 241 may be separated from the portion of the second electrode 240 facing the movable electrode 20 . That is, the enlarged portion 241 does not have to be electrically connected to the second electrode 240 .

(Example)
Specific examples of the switch device according to each of the first to third embodiments described above will be described below.

[Example 1]
First, the switch device according to the first embodiment will be described with reference to FIGS. 11 to 13. FIG.

FIG. 11 is a perspective view of the switch device 301 according to this embodiment. FIG. 12 is an exploded perspective view of the switch device 301 according to this embodiment. FIG. 13 is a perspective view of the first electrode 330 and the second electrode 340 of the switch device 301 according to this embodiment.

As shown in FIG. 11, the switch device 301 has five switch units 302a, 302b, 302c, 302d and 302e. Each of the five switch portions 302a to 302e can be pushed by the operating body 90, and ON/OFF determination is made independently for each of them. For example, a different function is assigned to each switch unit. The five switch units 302a to 302e are arranged side by side in one direction, but may be arranged in a matrix, and the arrangement is not particularly limited. The number of switch units included in the switch device 301 is not limited to five, and may be one to four, or six or more.

As shown in FIG. 12, the switch device 301 includes an insulating substrate 310, five movable electrodes 320, five first electrodes 330, a second electrode 340, a flexible film 360, and an adhesive layer 370. , an electrode protection layer 380, an adhesive layer for attachment 385, and a reinforcing plate 390 (illustrated only in FIG. 11 and omitted in FIG. 12). The switch device 301 also includes a control circuit 50 (not shown). The movable electrodes 320 and the first electrodes 330 are provided in the same number as the number of switch units provided in the switch device 301 .

The insulating substrate 310 corresponds to the insulating substrate 10 described above. In this embodiment, the insulating base material 310 is configured in a rectangular flat plate shape, and has an extending portion 313 extending in one direction from the flat plate portion. The extended portion 313 is a portion for providing wiring for electrically connecting the switch device 301 to another device. A connector (not shown) and a reinforcing plate 390 are provided at the distal end of the extended portion 313 . The extending portion 313 may be flexible and bendable. Note that the extended portion 313 may not be provided.

The movable electrode 320 corresponds to the movable electrode 20 described above. The five movable electrodes 320 are provided with an adhesive layer 370 and fixed to the upper surface of the insulating base material 310 by the adhesive layer 370 . The movable electrode 320 may have an enlarged portion 122, like the movable electrode 120 shown in FIG. The planar shape of the movable electrode 320 is circular, but may be square, rectangular, polygonal, elliptical, or the like, and is not particularly limited.

The first electrode 330 corresponds to the first electrode 30 described above. In this embodiment, the five first electrodes 330 are electrically insulated from each other, and the amount of charge flowing into each can be individually detected. The planar shape of the first electrode 330 is circular, but may be square, rectangular, polygonal, oval, etc., and is not particularly limited. As shown in FIG. 13, the wiring 332 from each of the five first electrodes 330 extends to the tip portion of the extended portion 313 without contacting each other.

The second electrode 340 corresponds to the second electrode 40 described above. In this embodiment, the second electrode 340 is common to the five switch sections 302a-302e. The second electrode 340 is provided so as to surround each of the five first electrodes 330 . Focusing on each switch part, the second electrodes 340 of each switch part are electrically connected to each other by wiring 342 and controlled to have the same potential.

Also, in this embodiment, as shown in FIG. 13, the second electrode 340 has a mesh-like enlarged portion 341 . The enlarged portion 341 is provided on the lower surface of the insulating base material 310 so as to cover the portion where the five movable electrodes 320 are not provided.

The planar shape of the portion of the second electrode 340 excluding the enlarged portion 341 is an annular shape with a predetermined width, but may be a square, rectangular, polygonal annular shape, or elliptical annular shape, and is not particularly limited. . The second electrode 340 does not have to surround the first electrode 330 .

The flexible film 360 collectively covers the five movable electrodes 320, but is not limited to this. A flexible film 360 may be provided for each one or more movable electrodes 320 .

The adhesive layer 370 fixes the insulating base material 310 and the flexible film 360 by sandwiching the five movable electrodes 320 with the insulating base material 310 . In this embodiment, the adhesive layer 370 is separated into two, but it is not limited to this. The adhesive layer 370 is, for example, an adhesive sheet, but is not limited to this. The adhesive layer 370 may be formed by applying an adhesive to the flexible film 360 by printing.

Electrode protection layer 380 is provided on the lower surface side of insulating base material 310 to protect first electrode 330 and second electrode 340 . The electrode protection layer 380 is formed, for example, by applying an insulating resin material by a printing method or the like.

The attachment adhesive layer 385 is an adhesive layer for attaching the switch device 301 to another member. For example, the mounting adhesive layer 385 is, for example, double-sided tape, but is not limited to this. For example, it may be formed by applying an adhesive to the electrode protection layer 380 by printing.

The reinforcing plate 390 is provided to increase the strength of the distal end portion of the extended portion 313 of the insulating base material 310 . A connector connection terminal portion (not shown) is provided at the tip portion of the extension portion 313 and is used for electrical connection to other members. By providing the reinforcing plate 390, the contact with the connector terminal is stabilized, and damage to the wiring is suppressed.

[Example 2]
Next, a switch device according to a second embodiment will be described with reference to FIGS. 14 to 17. FIG.

FIG. 14 is a perspective view of the switch device 401 according to this embodiment. FIG. 15 is an exploded perspective view of the switch device 401 according to this embodiment. FIG. 16 is a perspective view showing the insulating base material 410, the first electrode 430 and the second electrode 440 of the switch device 401 according to this embodiment. FIG. 17 is a cross-sectional view of the switch device 401 according to this embodiment. Specifically, FIG. 17 represents a cross section along line XVII-XVII of FIG.

As shown in FIGS. 14 to 17, the switch device 401 includes an insulating substrate 410, a movable electrode 420, a first electrode 430, a second electrode 440, a flexible film 460, and a pusher 465. , provided. Although not shown, the switch device 401 includes a control circuit 50 . Switch device 401 is a discrete component.

The insulating substrate 410 corresponds to the insulating substrate 10 described above. The insulating substrate 410 has a top surface 411 and a bottom surface 412, as shown in FIG. The insulating base material 410 has a flange portion 413 provided so as to surround the upper surface 411 . The flange portion 413 is a wall portion that supports the flexible film 460 . The insulating base material 410 has a concave portion 414 surrounded by a flange portion 413 and an upper surface 411 . A flexible film 460 is provided to cover the opening of the recess 414 .

The insulating base material 410 can be formed together with the first electrode 430 and the second electrode 440 by insert molding or the like using a resin material and a metal material.

The movable electrode 420 corresponds to the movable electrode 20 described above. In this embodiment, movable electrode 420 is positioned within recess 414 . Specifically, a pusher 465 is arranged on the upper surface of the movable electrode 420 so as to be in contact therewith.

First electrode 430 and second electrode 440 correspond to first electrode 30 and second electrode 40, respectively, described above. In this embodiment, the first electrode 430 and the second electrode 440 are embedded within the insulating substrate 410 . That is, the first electrode 430 and the second electrode 440 are not exposed on either the upper surface 411 or the lower surface 412 of the insulating base material 410 .

A terminal portion 431 is connected to the first electrode 430 . The terminal portion 431 is a portion for electrical connection to the first electrode 430 and is connected to the control circuit 50 (not shown). A terminal portion 441 is connected to the second electrode 440 . The terminal portion 441 is a portion for electrical connection to the second electrode 440 and is connected to the control circuit 50 (not shown).

The terminal portions 431 and 441 respectively protrude from two opposing side surfaces along the lower surface 412 of the insulating base material 410 . This enables easy connection with other parts by soldering or the like. The terminal portions 431 and 441 may protrude from the same side of the insulating base 410 or from two adjacent sides. The terminal portions 431 and 441 may be exposed only on the lower surface 412, and may be mounted on a substrate (not shown) or the like by bump electrodes or the like.

In this embodiment, the planar shape of the first electrode 430 is circular. A planar view shape of the second electrode 440 is an annular shape surrounding the first electrode 430 . The plan view shape of each of first electrode 430 and second electrode 440 is not particularly limited.

Flexible film 460 is supported and fixed to flange portion 413 so as to cover concave portion 414 of insulating base material 410 . A pusher 465 is connected to the lower surface of the flexible film 460 . The pusher 465 is a rigid block-shaped solid object. The pusher 465 has insulating properties, but may have electrical conductivity. For example, the pusher 465 is formed using resin or metal. When the flexible film 460 is pushed by the operating body 90 (not shown), the flexible film 460 is deformed and can push the displacement portion 421 of the movable electrode 420 via the pusher 465 . Note that the pusher 465 may not be provided. When the flexible film 460 is pushed into the operation body 90 , the flexible film 460 may come into contact with the movable electrode 420 and push the displacement portion 421 of the movable electrode 420 .

(Other embodiments)
Although the switch device according to one or more aspects has been described above based on the embodiments, the present disclosure is not limited to these embodiments. As long as they do not deviate from the gist of the present disclosure, modifications that can be made by those skilled in the art to the present embodiment, and forms constructed by combining the components of different embodiments are also included within the scope of the present disclosure. be

For example, in Embodiment 3, an example in which the control circuit 50 detects the approach of the operation tool 90 using the enlargement unit 241 and changes the scan speed has been described, but the present invention is not limited to this. For example, the control circuit 50 may change the scan speed based on the amount of pressing of the displacement portion 21 of the movable electrode 20 by the operating body 90 . Specifically, the control circuit 50 may change the scanning speed based on the capacitance value of the electrostatic capacitance C<b>1 that increases according to the pressing amount of the displacement portion 21 .

As shown in FIG. 3, when the operating body 90 pushes the displacement portion 21, the capacitance value of the electrostatic capacitance C1 gradually increases before the reaction force reaches its peak. Therefore, the control circuit 50 may preset a second threshold smaller than the ON/OFF determination threshold (first threshold) as the threshold for changing the scanning speed. The control circuit 50 may change the scanning speed to a high speed when the capacitance value of the electrostatic capacitance C1 becomes larger than the second threshold. As a result, the scanning speed can be kept low when the displacement portion 21 is not pushed by the operating body 90, which contributes to energy saving.

Further, instead of changing the scanning speed, or in addition to changing the scanning speed, the control circuit 50 determines ON/OFF when the capacitance value of the electrostatic capacitor C1 becomes larger than the second threshold. A part of the processing to be operated according to the result may be started in advance. For example, if a predetermined image is to be displayed on the display when the switch device according to the present disclosure is turned on, reading of the image from the memory, processing of the read image, etc. are started in advance, and it is determined that it is on. The image may be immediately displayed on the display if requested. As a result, it is possible to shorten the reaction delay time of the process to the switch operation. It is more useful when high responsiveness is required, such as game controllers.

Further, for example, the operating body 90 does not need to be pushed into the movable electrode 20 by directly contacting it. For example, as shown in FIG. 18 , the operating body 90 may indirectly push the movable electrode 20 via a pusher 80 provided in the switch device 501 . The pusher 80 is supported by a support portion 81 so as to be vertically movable. The support portion 81 may be configured integrally with the insulating base material 10 . In the example shown in FIG. 18, since the enlarged portion 241 of the second electrode 240 is provided, it is possible to detect the approach of the operating body 90 as in the third embodiment.

Further, one aspect of the present disclosure can be implemented as a control method for the switch device described above or a program that causes a computer to execute the control method. Alternatively, one aspect of the present disclosure can be implemented as a computer-readable non-temporary recording medium storing the program.

In addition, various changes, replacements, additions, and omissions can be made to each of the above-described embodiments within the scope of claims or equivalents thereof.

INDUSTRIAL APPLICABILITY The present disclosure can be used as a switch device that can accurately determine whether it is on or off, and can be used in various devices such as input devices, operation devices, and game controllers.

1, 2, 101, 102, 103, 104, 201, 301, 401, 501 switch device 10, 310, 410 insulating substrate 11, 411 upper surface 12, 412 lower surface 20, 20a, 120, 120a, 120b, 120e, 320 , 420 movable electrodes 21, 121e, 421 displacement portions 30, 330, 430 first electrodes 40, 240, 340, 440 second electrodes 50 control circuits 60, 360, 460 flexible film 70 adhesive layer 80 pusher 81 support portion 90 Operation body 120c Metal member 120d Conductive layers 122, 122a, 241, 341 Enlarged parts 302a, 302b, 302c, 302d, 302e Switch part 313 Extension parts 332, 342 Wiring 370 Adhesive layer 380 Electrode protective layer 385 Adhesive layer 390 for attachment Reinforcement plate 413 Flange portion 414 Concave portions 431, 441 Terminal portion 465 Pusher

Claims (9)

an insulating substrate;
a movable electrode disposed on the upper surface side of the insulating base and having a displacement portion capable of displacing a position with respect to the insulating base;
a first electrode and a second electrode arranged with at least part of the insulating base sandwiched between the movable electrode and the movable electrode;
a control circuit connected to each of the first electrode and the second electrode;
The first electrode is arranged at a position facing the displacement portion,
the second electrode is spaced apart from the first electrode;
The control circuit is
By applying a first potential to the first electrode and applying a second potential different from the first potential to the second electrode, the capacitance between at least the first electrode and the movable electrode detect the change in the capacitance value of, and perform ON/OFF determination based on the detection result,
switch device. The control circuit connects the second potential to a ground potential when charging the first electrode.
The switch device according to claim 1. The control circuit connects the first potential to a ground potential when discharging from the first electrode.
The switch device according to claim 1 or 2. the movable electrode has a first enlarged portion extending along the upper surface of the insulating base;
The second electrode is arranged at a position facing the first enlarged portion,
The switch device according to any one of claims 1 to 3. the movable electrode generates a click feeling with respect to the operating body when the operating body pushes the displacement portion downward;
The control circuit makes the determination when the click feeling occurs.
The switch device according to any one of claims 1 to 4. The second electrode has a second enlarged portion extending outside the movable electrode in plan view,
The area of the second enlarged portion is equal to or larger than the overlapping area of the second electrode and the movable electrode in a plan view, and
The control circuit detects a change in the capacitance value of the capacitance between the second electrode and the operating body, and detects the approach of the operating body based on the detection result.
The switch device according to any one of claims 1 to 5. The control circuit detects the approach of the operating body while the first potential and the second potential are connected to equal potentials.
The switch device according to claim 6. The control circuit has a detection mode for detecting the approach of the operating object and a determination mode for performing the determination,
switching from the detection mode to the determination mode when the approach of the operating body is detected in the detection mode;
The switch device according to claim 6 or 7. the scan speed in the detection mode is lower than the scan speed in the determination mode;
The switch device according to claim 8.

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