WO2018131674A1

WO2018131674A1 - Rub detecting sensor and electronic instrument

Info

Publication number: WO2018131674A1
Application number: PCT/JP2018/000614
Authority: WO
Inventors: 大寺　昭三; 森　健一
Original assignee: 株式会社村田製作所
Priority date: 2017-01-12
Filing date: 2018-01-12
Publication date: 2018-07-19
Also published as: CN210571096U

Abstract

Provided is a rub detecting sensor capable of detecting the direction of a rubbing operation using a simple structure that is not bulky. This rub detecting sensor is provided with: a first region (R1) which accepts a pressing operation from a user; a second region (R2) at least part of which is adjacent to the first region (R1) and which accepts a pressing operation from the user; a piezoelectric element (10) which outputs electric potentials having respectively opposite polarities when a pressing operation is accepted by the first region (R1) and when a pressing operation is accepted by the second region (R2); and an operation detecting unit (18) which detects a rubbing operation on the basis of states of detection by the piezoelectric element (10) in the first region (R1) and the second region (R2).

Description

Rub detection sensor and electronic device

One embodiment of the present invention relates to a rubbing detection sensor including a piezoelectric element and an electronic apparatus using the same.

Patent Document 1 discloses an input device using a jog dial provided with a rotation key. In the input device described in Patent Document 1, a drive signal for an active element is generated by a logical operation of a rotation detection signal waveform formed by a rotation operation of a rotary operator. For this reason, the time lag between rotation operation by a user and the production | generation of the drive signal according to it can be suppressed.

JP 2008-287650 A

In the input device described in Patent Document 1, a physical rotation mechanism such as a jog dial having a rotation key is used. Such a rotation mechanism portion is bulky in structure and occupies a certain place when used in an electronic device. In addition, when dust or the like enters the clearance between the rotation mechanism units, not only the rotation mechanism unit but also the electronic device itself may break down. Furthermore, since the rotation mechanism portion is provided so as to protrude from the surface of the electronic device, the surface of the electronic device has an uneven shape, so that dust and the like are easily attached, and the operation part touched by a person is easily soiled. There is room.

Therefore, an object of one embodiment of the present invention is to provide a rubbing detection sensor that can detect the direction of the rubbing operation with a simple structure that is small in bulk.

The rubbing detection sensor according to an embodiment of the present invention includes a first region that receives a pressing operation from a user, a second region that is at least partially adjacent to the first region and receives the pressing operation from the user, Piezoelectric elements that output potentials of opposite polarities when the pressing operation is received in the first region and when the pressing operation is received in the second region, the first region, and the second region An operation detection unit that detects a rubbing operation based on a detection mode of the piezoelectric element in the region.

In this configuration, when the first region and the second region receive a rubbing operation, the piezoelectric element outputs a potential corresponding to each operation applied to the first region and the second region with a time difference. When a rubbing operation is accepted from the first area to the second area, the deformation of the first area is restored and the second area is deformed near the boundary between the first area and the second area. Further, when a rubbing operation is accepted from the second area to the first area, the deformation of the second area is restored and the first area is deformed near the boundary between the first area and the second area. For this reason, a potential having the same polarity is generated from the first region and the second region. Therefore, for example, rubbing can be detected by looking at the peak of the potential with time. Further, the rubbing detection sensor can be formed thin using a piezoelectric element.

An electronic apparatus according to an embodiment of the present invention includes the rubbing detection sensor.

In this configuration, a rubbing detection sensor is used, and since the rubbing detection sensor can be formed thin, the electronic device itself can be reduced in weight and slim. In addition, since no gap is generated on the surface of the electronic device, failure due to dust or the like can be prevented. Furthermore, since the surface of the electronic device can be formed flat, contamination of the operation part is suppressed.

According to an embodiment of the present invention, the direction of the rubbing operation can be detected with a simple structure that is small in bulk.

FIG. 1A is a perspective view of an electronic device provided with a rubbing detection sensor according to the first embodiment, and FIG. 1B is a cross-sectional view thereof. 2A is an exploded perspective view of the piezoelectric element according to the first embodiment, and FIG. 2B is a sectional view thereof. 3A to 3C are views for explaining the piezoelectric film according to the first embodiment. 4A is an exploded perspective view of a piezoelectric element according to a modification, and FIG. 4B is a cross-sectional view thereof. FIGS. 5A to 5D are diagrams for explaining the relationship between the direction in which the rubbing operation of the rubbing detection sensor according to the first embodiment is received and the generated potential. FIGS. 6A to 6D are diagrams for explaining generated potentials when a rubbing operation is performed in the direction opposite to that in FIGS. 5A to 5D. FIGS. 7A to 7D are diagrams for explaining the generated potential of the rubbing detection sensor according to the second embodiment. FIG. 8A is an exploded perspective view showing the rubbing detection sensor according to the third embodiment, FIG. 8B is a plan view in the XY plane, and FIG. 8C is for explaining the generated potential. FIG. 9A is a cross-sectional view of the rubbing detection sensor according to the fourth embodiment on the XZ plane, and FIG. 9B is a plan view of the rubbing detection sensor according to the fifth embodiment on the XY plane. 9 (C) and (D) are diagrams for explaining the generated potentials in the fourth and fifth embodiments. 10A is a cross-sectional view of the rubbing detection sensor according to the sixth embodiment in the XZ plane, and FIG. 10B is a plan view of the rubbing detection sensor according to the seventh embodiment in the XY plane. 10 (C) and (D) are diagrams for explaining the generated potentials in the sixth and seventh embodiments. FIG. 11A is a perspective view of an electronic device provided with the rubbing detection sensor according to the eighth embodiment, and FIG. 11B is a diagram for explaining the generated potential. FIG. 12A is a perspective view of an electronic apparatus provided with the rubbing detection sensor according to the first modification, FIG. 12B is a plan view of the rubbing detection sensor in FIG. 12A, and FIG. FIG. 12B is a cross-sectional view of the rubbing detection sensor of FIG. FIG. 13A is a diagram for explaining a normal time when a pressing operation is received in the first modification, and FIGS. 13B and 13C explain an abnormal time when the housing 2 is deformed. It is a figure for doing. FIG. 14A is a perspective view of an electronic apparatus provided with the rubbing detection sensor according to the second modification, FIG. 14B is a plan view of the rubbing detection sensor in FIG. 14A, and FIG. FIG. 14B is a cross-sectional view of the rubbing detection sensor 14 (B) taken along II-II. FIG. 15 is a cross-sectional view for explaining a rubbing detection sensor according to Modification 3.

FIG. 1A is a perspective view of an electronic apparatus provided with a rubbing detection sensor according to the first embodiment, and FIG. 1B is a cross-sectional view taken along a line II shown in FIG. 2A is an exploded perspective view of the piezoelectric element according to the first embodiment, and FIG. 2B is a cross-sectional view in the XZ plane. Note that the electronic devices illustrated in FIGS. 1A and 1B are merely examples, and are not limited thereto, and can be changed as appropriate according to specifications.

As shown in FIG. 1A, the electronic device 1 includes a substantially rectangular parallelepiped housing 2 having an upper surface opened. The electronic device 1 includes a flat surface panel 3 disposed in an opening on the upper surface of the housing 2. The front panel 3 functions as an operation surface on which a user performs a touch operation using a finger or a pen. Below, the width direction (horizontal direction) of the housing | casing 2 is set to X direction, a length direction (vertical direction) is set to Y direction, and the thickness direction is demonstrated as Z direction.

A display unit 4, a first pressing unit 5, and a second pressing unit 6 are formed on the operation surface of the front panel 3. In this embodiment, the 1st press part 5 and the 2nd press part 6 are rectangular shape by planar view, and each one part is formed adjacently along with the X direction. The first pressing part 5 and the second pressing part 6 are part of the surface panel 3 and are formed continuously with the surface panel 3. The first pressing part 5 and the second pressing part 6 are distinguished from other parts of the front panel 3 by color-coding a part of the front panel 3, marking them, or forming grooves around them. . Moreover, the shape of the 1st press part 5 and the 2nd press part 6 is not restricted to a rectangular shape, Each part should just be mutually adjacent, and another shape, such as a triangle shape, may be sufficient. Further, the first pressing portion 5 and the second pressing portion 6 are not limited to being arranged in the X direction, and may be, for example, a state arranged in the Y direction or a direction oblique to the X direction.

The first pressing portion 5 corresponds to a “first region R1” that receives a pressing operation according to the present invention, and the second pressing portion 6 corresponds to a “second region R2” that receives a pressing operation according to the present invention. Since the first pressing part 5 and the second pressing part 6 are partially formed adjacent to each other, the first pressing part 5 and the second pressing part 6 can continuously receive a pressing operation. That is, the 1st press part 5 and the 2nd press part 6 receive the rubbing operation which goes to 2nd area | region R2 from 1st area | region R1. In the present embodiment, for convenience of explanation, a direction from the first region R1 to the second region R2 is referred to as a “first direction”, and a direction from the second region R2 to the first region R1 is referred to as a “second direction”.

As shown in FIG. 1B, a rubbing detection sensor 100 is formed inside the housing 2 and below the front panel 3 in the Z direction. The rubbing detection sensor 100 includes the piezoelectric element 10 and the operation detection unit 18. The piezoelectric element 10 is disposed in a portion corresponding to the first region R1 and the second region R2. When a user performs a touch operation on the front panel 3 using a finger or a pen, pressure is transmitted to the piezoelectric element 10. As will be described in detail later, the piezoelectric element 10 receives a pressing operation at the second pressing portion 6 that is the second region R2 when receiving a pressing operation at the first pressing portion 5 that is the first region R1. Outputs a potential of the opposite polarity. For this reason, the operation detection unit 18 outputs a potential corresponding to the operation received in the first region R1 and the second region R2 by the piezoelectric element 10. The operation detection unit 18 is disposed inside the housing 2 and is connected to the piezoelectric element 10 by a wiring (not shown). The operation detection unit 18 detects a rubbing operation corresponding to the detection mode of the potential output from the piezoelectric element 10. The operation detection unit 18 may be at any position as long as it is inside the housing 2.

As shown in FIGS. 2A and 2B, the piezoelectric element 10 preferably includes a flat film-like piezoelectric film 11 and a flat film-like electrode 12. 2A and 2B, illustrations other than the piezoelectric film 11 and the electrode 12 are omitted.

The piezoelectric film 11 includes a first piezoelectric film 111 and a second piezoelectric film 112. The first piezoelectric film 111 is disposed in the first region R1, and the second piezoelectric film 112 is disposed in the second region R2. The first piezoelectric film 111 has a rectangular shape in a plan view, like the surface of the first region R1, that is, the first pressing portion 5. The second piezoelectric film 112 also has a rectangular shape in plan view, like the surface of the second region R2, that is, the second pressing portion 6. In addition, the 1st piezoelectric film 111 and the 2nd piezoelectric film 112 can also be suitably changed according to the shape of the 1st press part 5 and the 2nd press part 6. FIG.

The electrode 12 includes an electrode 121 and an electrode 122. The electrode 121 and the electrode 122 are respectively formed on both main surfaces of the first piezoelectric film 111 and the second piezoelectric film 112 so as to cover substantially the entire main surface. More specifically, the electrode 121 is formed in a rectangular shape in the same way as a plane in which the first piezoelectric film 111 and the second piezoelectric film 112 are continuous in plan view. It is formed so as to cover one main surface. The electrode 122 is formed in a rectangular shape in the same way as the surface in which the first piezoelectric film 111 and the second piezoelectric film 112 are continuous in plan view, and the electrode 121 in the first piezoelectric film 111 and the second piezoelectric film 112 is formed. It is formed so as to cover the main surface on the side that is not.

When the piezoelectric element 10 is viewed in plan, at least one of the electrode 121 and the electrode 122 may be completely overlapped with the piezoelectric film 11 when viewed from above, or may be located on the inner side in the plane direction from the piezoelectric film 11. Thereby, the short circuit in the edge part of an electrode can be suppressed. In FIGS. 2A and 2B, the electrode 121 and the electrode 122 are represented as solid electrodes. However, an electrode is provided for each of the first piezoelectric film 111 and the second piezoelectric film 112, so You may connect with the wiring electrode of illustration.

3A to 3C are views for explaining the piezoelectric film according to the first embodiment. FIG. 3A and FIG. 3B are plan views of an example of the piezoelectric film according to the first embodiment. FIG. 3C is a cross-sectional view in the XZ plane of an example of the piezoelectric film according to the first embodiment. The first piezoelectric film 111 generates a potential having a polarity opposite to that generated by the second piezoelectric film 112 when a pressing operation is received.

As shown in FIG. 3A, the first piezoelectric film 111 and the second piezoelectric film 112 may be films formed of a chiral polymer. In the first embodiment, polylactic acid (PLA), particularly L-type polylactic acid (PLLA) is used as the chiral polymer. PLLA made of a chiral polymer has a main chain with a helical structure. PLLA has piezoelectricity when uniaxially stretched and molecules are oriented. The uniaxially stretched PLLA generates a potential when the flat surfaces of the first piezoelectric film 111 and the second piezoelectric film 112 are pressed. At this time, the amount of potential generated depends on the amount of displacement by which the flat plate surface is displaced in the direction orthogonal to the flat plate surface by the pressing amount.

In the first embodiment, the uniaxial stretching directions of the first piezoelectric film 111 and the second piezoelectric film 112 (PLLA) are opposite to the X direction and the Y direction, respectively, as indicated by arrows in FIG. The direction is an angle of 45 degrees. The 45 degrees includes an angle including about 45 degrees ± 10 degrees, for example. Thereby, the electric potential generated when the first piezoelectric film 111 is pressed and the electric potential generated when the second piezoelectric film 112 is pressed have opposite polarities.

PLLA generates piezoelectricity by molecular orientation treatment such as stretching, and does not need to be polled like other polymers such as PVDF or piezoelectric ceramics. That is, the piezoelectricity of PLLA that does not belong to ferroelectrics is not expressed by the polarization of ions like ferroelectrics such as PVDF or PZT, but is derived from a helical structure that is a characteristic structure of molecules. is there. For this reason, the pyroelectricity generated in other ferroelectric piezoelectric materials does not occur in PLLA. Since there is no pyroelectricity, there is no influence of the temperature of the user's finger or frictional heat, so the front panel 3 can be formed thin. Further, PVDF or the like shows a change in piezoelectric constant over time, and in some cases, the piezoelectric constant may be significantly reduced, but the piezoelectric constant of PLLA is extremely stable over time. Therefore, it is possible to detect displacement caused by pressing with high sensitivity without being affected by the surrounding environment.

Further, as shown in FIG. 3B, the first piezoelectric film 111 and the second piezoelectric film 112 may be made of a film formed from two types of chiral polymers. For example, L-type polylactic acid (PLLA) may be used as the first piezoelectric film 111, and D-type polylactic acid (PDLA) may be used. In this case, the uniaxial stretching direction is the same direction that forms an angle of 45 degrees in the direction with respect to the X direction and the Y direction, as indicated by arrows in FIG. The 45 degrees includes an angle including about 45 degrees ± 10 degrees, for example. Thereby, the electric potential generated when the first piezoelectric film 111 is pressed and the electric potential generated when the second piezoelectric film 112 is pressed have opposite polarities.

Further, as shown in FIG. 3C, the first piezoelectric film 111 and the second piezoelectric film 112 are made of a film formed of a ferroelectric material in which ions are polarized, such as PVDF or PZT subjected to poling treatment. It may be. For example, as shown in FIG. 3C, PVDF whose upper side in the Z direction is positively charged may be used as the first piezoelectric film 111, and PVDF whose upper side in the Z direction is negatively charged may be used as the second piezoelectric film 112. . Thereby, the electric potential generated when the first piezoelectric film 111 is pressed and the electric potential generated when the second piezoelectric film 112 is pressed have opposite polarities.

The

electrodes

121 and 122 formed on both main surfaces of the first piezoelectric film 111 and the second piezoelectric film 112 are preferably metal electrodes such as aluminum and copper. By providing such an electrode 121 and an electrode 122, electric charges generated by the first piezoelectric film 111 and the second piezoelectric film 112 can be acquired as a potential difference, and a pressing amount detection signal having a voltage value corresponding to the pressing amount is output to the outside. can do.

In the piezoelectric element 10, a first piezoelectric film 111 and a second piezoelectric film 112 that generates a potential having a polarity opposite to that generated by the first piezoelectric film 111 when a pressing operation is received are used. However, the piezoelectric film may be composed of a single film as shown in the following modification.

4A is an exploded perspective view of a piezoelectric element according to a modification, and FIG. 4B is a cross-sectional view thereof. As shown in FIGS. 4A and 4B, the piezoelectric element 13 according to the modified example preferably includes a flat film-shaped piezoelectric film 43 and a flat film-shaped pair of electrodes 14. 4A and 4B, illustrations other than the piezoelectric film 43 and the electrode 14 are omitted.

The piezoelectric film 43 is composed of a single film, and is disposed in the first region R1 and over the second region R2. The electrode 14 includes an electrode 15 and an electrode 16. The electrode 15 includes a first detection electrode 123 and a second detection electrode 124 that are continuously formed on the same plane. The electrode 16 is a single ground electrode. The first detection electrode 123 and the second detection electrode 124 are formed to face the electrode 16 with the piezoelectric film 43 interposed therebetween. The first detection electrode 123 is disposed in the first region R1, and the second detection electrode 124 is disposed in the second region R2. The first detection electrode 123 has a rectangular shape in a plan view, like the surface of the first region R1, that is, the first pressing portion 5. The second detection electrode 124 has a rectangular shape in a plan view, like the surface of the second region R2, that is, the second pressing portion 6. Thus, the 1st detection electrode 123 is each formed in the 1st main surface corresponding to 1st area | region R1 of the piezoelectric film 43 so that the substantially whole surface of a 1st main surface may be covered. The second detection electrodes 124 are also formed on the first main surface corresponding to the second region R2 of the piezoelectric film 43 so as to cover substantially the entire first main surface. The electrode 16 is formed on the second main surface corresponding to the first region R1 and the second region R2 of the piezoelectric film 43 so as to cover substantially the entire surface of the second main surface. Note that the piezoelectric film 43, the electrode 15, and the electrode 16 can be appropriately changed in accordance with the shapes of the first pressing portion 5 and the second pressing portion 6. The electrode 15 is formed on the first main surface of the piezoelectric film 43, and the electrode 16 is formed on the second main surface of the piezoelectric film 43. The

electrodes

15 and 16 are the main electrodes opposite to the piezoelectric film 43, respectively. It may be formed on the surface.

When the piezoelectric element 13 is viewed in a plan view, at least one of the electrode 15 and the electrode 16 may be completely overlapped with the piezoelectric film 113 when viewed from above, or may be located on the inner side in the plane direction from the piezoelectric film 113. Thereby, the short circuit in the edge part of an electrode can be suppressed. 2A and 2B, the electrode 16 is represented as a solid electrode. However, an electrode is provided for each of the first detection electrode 123 or the second detection electrode 124, and a wiring (not shown) is provided. You may connect with an electrode.

The first detection electrode 123 outputs a signal having a polarity different from that of the second detection electrode 124. For example, when a pressing operation is applied in the first region R <b> 1, the first detection electrode 123 outputs a potential in a direction corresponding to the first detection electrode 123. On the other hand, when a pressing operation is applied in the second region R2, the second detection electrode 124 outputs a reverse potential having a polarity different from that of the first detection electrode 123 corresponding to the second detection electrode 124. Accordingly, since different potentials are detected when a pressing operation is received in the first region R1 and the second region R2, the piezoelectric element 13 according to such a modification is also used in the present invention in the same manner as the piezoelectric element 10. can do. In addition, since the piezoelectric film 43 is composed of a single sheet, the structure of the piezoelectric film 43 becomes simple and the manufacture becomes easy.

Here, the potential generated when the rubbing detection sensor 100 receives a rubbing operation will be described. FIGS. 5A to 5D are diagrams for explaining the relationship between the direction (first direction) in which the rubbing operation of the rubbing detection sensor according to the first embodiment is received and the generated potential. FIGS. 6A to 6D are diagrams for explaining generated potentials when a rubbing operation is performed in the direction opposite to FIGS. 5A to 5D (second direction). First, the case where the rubbing operation is performed in the direction shown in FIGS. 5A to 5D will be described, and then the case where the rubbing operation is performed in the reverse direction shown in FIGS. 6A to 6D will be described. To do.

FIG. 5A is an explanatory diagram of the rubbing operation, and FIG. 5B represents a potential change with respect to the time axis that occurs only from the first region R1 when the rubbing operation is accepted in the first region R1. FIG. 5C shows a potential change with respect to the time axis generated only from the second region R2 when the rubbing operation is accepted in the second region R2, and FIG. 5D shows the first region R1 and the second region R2. It is a graph showing the electric potential generated when region R2 receives a rubbing operation. In FIG. 5A, the direction of receiving the rubbing operation is the first direction from the first region R1 toward the second region R2. 5A, for convenience of explanation, the piezoelectric film 11 (the first piezoelectric film 111 and the second piezoelectric film 112) of the rubbing detection sensor 100 is shown, and the rest is omitted. Similarly, FIG. 6A to FIG. 11B are omitted.

As shown in FIG. 5A, when the user performs a rubbing operation to move a finger from the first region R1 to the second region R2 (first direction) along the direction of the arrow, the first piezoelectric film 111 and the first The two piezoelectric films 112 receive pressing operations in order. As described above, the timing at which the first piezoelectric film 111 and the second piezoelectric film 112 receive the pressing operation is shifted. When a pressing operation is received in the first region R1, the first piezoelectric film 111 disposed in the first region R1 receives the pressing operation and is greatly distorted downward in the Z-axis direction. Electric charge is generated at the portion where the pressing operation of the first piezoelectric film 111 is received. As shown in FIG. 5B, the first piezoelectric film 111 generates a negative potential when greatly distorted downward in the Z-axis direction. As the user moves his / her finger, the applied pressure of the first piezoelectric film 111 is reduced to the original flat shape because the applied pressure is reduced. At this time, the portion that has received the pressing operation of the first piezoelectric film 111 returns upward in the Z-axis direction, and thus generates a positive potential. Further, when a pressing operation is received in the second region R2, the second piezoelectric film 112 disposed in the second region R2 receives the pressing operation and is greatly distorted downward in the Z-axis direction. As shown in FIG. 5C, the second piezoelectric film 112 generates a positive potential when greatly distorted downward in the Z-axis direction. When the user moves his / her finger, the portion that has received the pressing operation of the second piezoelectric film 112 is restored to the original flat shape. At this time, the portion that has received the pressing operation of the second piezoelectric film 112 returns upward in the Z-axis direction, and thus generates a negative potential.

The lengths of the first piezoelectric film 111 and the second piezoelectric film 112 in the direction of receiving the rubbing operation are preferably 10 mm or more, respectively. Thereby, the pressing operation by the user's finger in each of the first region R1 and the second region R2 can be sufficiently detected.

Further, the potential generated from the second piezoelectric film 112 is detected later than the potential generated from the first piezoelectric film 111. There are times when the portion of the first piezoelectric film 111 that receives the pressing operation returns upward in the Z-axis direction and the second piezoelectric film 112 is greatly distorted downward in the Z-axis direction. At this time, both the first piezoelectric film 111 and the second piezoelectric film 112 generate a positive potential. For this reason, as shown in FIG. 5D, when the rubbing detection sensor 100 receives a rubbing operation in the first direction, a positive potential is simultaneously generated from the first piezoelectric film 111 and the second piezoelectric film 112. The potential when it occurs is detected. Thereby, since positive potentials are detected in an overlapping manner, a large positive peak is detected. Thereby, the operation detection unit 18 detects that the detection value reaches the predetermined first threshold value V1, so that the user's operation is a rubbing operation in the first direction that moves from the first region R1 to the second region R2. It can be judged that there is. In addition, when the detection value reaches the predetermined second threshold value V2 within a certain time after the detection value reaches the predetermined first threshold value V1, the operation detection unit 18 sets the first region R1. It can be determined that the pressing operation is only pressing.

FIG. 6A is an explanatory diagram of the rubbing operation, and FIGS. 6B and 6C show the generated potential when the pressing operation is received in the second region R2 or the first region R1, respectively. FIG. 6D is a graph showing the generated potential when the first region R1 and the second region R2 receive the rubbing operation. In FIG. 6A, the direction of receiving the rubbing operation is the second direction from the second region R2 toward the first region R1.

As shown in FIG. 6A, when the user performs a rubbing operation to move a finger from the second region R2 to the first region R1 (second direction) along the direction of the arrow, the second piezoelectric film 112 and the first One piezoelectric film 111 receives pressing operations in order. When a pressing operation is received in the second region R2, the second piezoelectric film 112 disposed in the second region R2 receives the pressing operation and is greatly distorted downward in the Z-axis direction. As a result, as shown in FIG. 6B, the second piezoelectric film 112 generates a positive potential when greatly distorted downward in the Z-axis direction. When the user moves his / her finger, the applied pressure of the second piezoelectric film 112 is reduced to the original flat shape because the applied pressure is reduced. At this time, the portion that has received the pressing operation of the second piezoelectric film 112 returns upward in the Z-axis direction, and thus generates a negative potential. Further, when a pressing operation is received in the first region R1, the first piezoelectric film 111 disposed in the first region R1 receives the pressing operation and is greatly distorted downward in the Z-axis direction. As a result, as shown in FIG. 6C, the first piezoelectric film 111 generates a negative potential when greatly distorted downward in the Z-axis direction. When the user moves his / her finger, the portion that has received the pressing operation of the first piezoelectric film 111 is restored to the original flat shape. At this time, the portion that has received the pressing operation of the first piezoelectric film 111 returns upward in the Z-axis direction, and thus generates a positive potential.

In contrast to the case where the rubbing operation in the first direction is accepted, the potential generated from the first piezoelectric film 111 is detected later than the potential generated from the second piezoelectric film 112. There are times when the portion of the second piezoelectric film 112 that has received a pressing operation returns upward in the Z-axis direction and when the first piezoelectric film 111 is greatly distorted downward in the Z-axis direction. At this time, both the first piezoelectric film 111 and the second piezoelectric film 112 generate a negative potential. For this reason, as shown in FIG. 6D, when the rubbing detection sensor 100 receives a rubbing operation in the second direction, a negative potential is generated simultaneously from the first piezoelectric film 111 and the second piezoelectric film 112. Is detected. Thereby, a large negative peak is detected. Thereby, the operation detection unit 18 detects that the detection value reaches the predetermined second threshold value V2, so that the user's operation is a rubbing operation in the second direction in which the user moves from the second region R2 to the first region R1. Judge that there is. In addition, when the detection value reaches the predetermined first threshold value V1 within a certain time after the detection value reaches the predetermined second threshold value V2, the operation detection unit 18 determines that the operation detection unit 18 is in the second region R2. It can be determined that the pressing operation is only pressing. Thus, since the operation detection part 18 can respectively determine the case where only 1st area | region R1 or 2nd area | region R2 was pushed, the rubbing detection sensor 100 is either 1st area | region R1 or 2nd area | region R2. Can also be used as a switch that switches when a pressing operation is received.

It is preferable that the second threshold value V2 is set to have a polarity different from that of the first threshold value V1. By setting in this manner, the direction in which the rubbing operation is performed can be easily determined. That is, the potential detected by the rubbing detection sensor 100 varies depending on the direction in which the operator performs the rubbing operation. For this reason, it is possible to clearly discriminate whether the rubbing operation in the first direction or the rubbing operation in the second direction is performed according to the magnitude of the potential output from the piezoelectric element 10. The second threshold value V2 may be set to have the same polarity as the first threshold value V1. In this case, the first threshold value V1 and the second threshold value V2 are set to different values. Therefore, it is possible to determine whether the rubbing operation is in the first direction or the rubbing operation in the second direction based on the difference in the magnitude of the potential output from the piezoelectric element 10.

In addition, in this embodiment, although the pair of press part of the 1st press part 5 and the 2nd press part 6 is formed, this pair may be formed in multiple numbers, respectively, and the operation surface of the surface panel 3 It may be arranged at any position other than the display unit 4.

Further, in the present embodiment, the first pressing portion 5 and the second pressing portion 6 are formed flat with no unevenness with respect to the operation surface of the front panel 3. For this reason, it becomes difficult for dust etc. to adhere to the operation surface of the surface panel 3, and the contamination of the operation part which a person touches can be prevented.

FIGS. 7A to 7D are diagrams for explaining the generated potential of the rubbing detection sensor according to the second embodiment. FIG. 7A is an explanatory diagram of the pushing operation, FIG. 7B is a graph showing the generated potential when the pressing operation is received in the adjusting piezoelectric element, and FIG. 7C is the adjusting piezoelectric element. FIG. 7D is a graph showing the potential generated when the position P1 is pressed when there is no element (that is, the first embodiment), and FIG. 7D shows the position when there is an adjustment piezoelectric element (that is, the second embodiment). It is a graph showing the electric potential generated when P1 receives the pushing operation.

As shown in FIG. 7A, the piezoelectric element 20 according to the second embodiment includes the piezoelectric film 11 and the adjusting piezoelectric element 23 according to the first embodiment. The adjusting piezoelectric element 23 includes

piezoelectric films

113 and 114. In FIG. 7A, for convenience of explanation, only the

piezoelectric films

113 and 114 of the adjustment piezoelectric element 23 are shown. The piezoelectric film 113 is continuously formed at the end of the first piezoelectric film 111, and the piezoelectric film 114 is continuously formed at the end of the second piezoelectric film 112. The piezoelectric film 113 has a polarity opposite to that of the first piezoelectric film 111, and the piezoelectric film 114 has a polarity opposite to that of the second piezoelectric film 112. That is, the second region R2 corresponding to the piezoelectric film 113 is further formed at the end portion on the first region R1 side, and the first region R1 corresponding to the piezoelectric film 114 is further formed on the end portion on the second region R2 side. The lengths of the adjustment piezoelectric elements 23, that is, the directions in which the

piezoelectric films

113 and 114 are subjected to the rubbing operation are preferably about 5 mm each. The width at which the fingertip touches the surface panel 3 at the moment of touching the surface panel 3 with the fingertip is approximately 10 mm.

When the rubbing detection sensor 100 receives a rubbing operation in the first direction, first, a pushing operation is accepted near the boundary between the first piezoelectric film 111 and the piezoelectric film 113 of P1. The first piezoelectric film 111 and the piezoelectric film 113 are each greatly distorted downward in the Z-axis direction. At this time, the potential as shown in FIG. 7B is generated from the first piezoelectric film 111, and at the same time, the potential opposite to that when the first region R1 as shown in FIG. It arises from the piezoelectric film 113.

The potential generated from the piezoelectric element 20 is the sum of the potentials generated from the first piezoelectric film 111 and the piezoelectric film 113. Therefore, as shown in FIG. 7D, the potential generated when only the first piezoelectric film 111 accepts the pushing operation is reduced by the potential generated from the piezoelectric film 113. Further, even when the pressing operation is received at the position closer to the piezoelectric film 113 than the position P1, the first piezoelectric film 111 is also distorted to some extent along with the piezoelectric film 113, so that only the piezoelectric film 113 receives the pressing operation. The generation potential of is reduced. Even if this is a case where the pushing operation is received at a position closer to the first piezoelectric film 111 than the position P1, similarly, the potential generated when only the first piezoelectric film 111 accepts the pushing operation is reduced. For this reason, in the rubbing detection sensor 100, generation | occurrence | production of the electric potential at the time of receiving the first pushing operation in the rubbing operation of a 1st direction is suppressed. Thereby, the potential generated by the rubbing operation in the first direction in the rubbing detection sensor 100 is more clearly detected. Furthermore, by providing the piezoelectric film 114, it is possible to suppress the generation of a potential when the first pushing operation in the rubbing operation in the second direction is accepted for the same reason.

FIG. 8A is an exploded perspective view showing the rubbing detection sensor according to the third embodiment, FIG. 8B is a plan view in the XY plane, and FIG. 8C is for explaining the generated potential. FIG.

As shown in FIGS. 8A and 8B, the piezoelectric element 30 according to the third embodiment is the first embodiment except that the piezoelectric film 31 and the electrode 32 are provided instead of the piezoelectric film 11 and the electrode 12. The configuration is almost the same as the form. In FIG. 8A, illustrations other than the piezoelectric film 31 and the electrode 32 are omitted.

The piezoelectric film 31 includes a first piezoelectric film 311 and a second piezoelectric film 312 that output potentials having opposite polarities when a pressing operation is received from the same direction. The first piezoelectric film 311 is laminated on the second piezoelectric film 312 so as to intersect the second piezoelectric film 312. In the first piezoelectric film 311, a portion (lamination portion 117) laminated on the second piezoelectric film 312 is narrowly formed in the X-axis direction. In the laminated portion 117, since the potentials of opposite polarities are output from the first piezoelectric film 311 and the second piezoelectric film 312, they are canceled and no potential is generated. The second piezoelectric film 312 is formed in a rectangular shape.

The electrode 32 includes a cross-shaped electrode 321 and an electrode 322. The electrode 321 and the electrode 322 are respectively formed on both main surfaces of the first piezoelectric film 311 and the second piezoelectric film 312 so as to cover substantially the entire main surface.

As in the first embodiment, the first piezoelectric film 311 is disposed in the first region R1, and the second piezoelectric film 312 is disposed in the second region R2. Therefore, in the laminated portion 117, a part of both the first region R1 and the second region R2 is provided so as to overlap each other. As described above, no electric potential is generated in the laminated portion 117 even when a pressing operation is accepted.

When a rotating rubbing operation is applied to the piezoelectric film 31 as indicated by an arrow shown in FIG. 8B, the first piezoelectric film 311 and the second piezoelectric film 312 alternately accept the pressing operation. That is, pressing operations are received alternately and continuously in the first region R1 and the second region R2. Therefore, as shown in FIG. 8C, the potential detected by the rubbing detection sensor 100 has a wave shape. As a result, a predetermined rotation operation can be detected. In addition, in the laminated portion 117 that is a central portion that receives the rotation operation, no potential is generated even when the pressing operation is received.

9A is a cross-sectional view of the rubbing detection sensor according to the fourth embodiment on the XZ plane, and FIG. 9B is a plan view of the rubbing detection sensor according to the fifth embodiment on the XY plane. 9 (C) and (D) are diagrams for explaining the generated potentials in the fourth and fifth embodiments.

As shown in FIG. 9A, the piezoelectric element 40 according to the fourth embodiment has substantially the same configuration as that of the first embodiment except that it includes a plurality of pairs of regions including the first region R1 and the second region R2. It has become. That is, the first piezoelectric film 111 and the second piezoelectric film 112 are alternately and continuously formed along a straight line. For this reason, when the user performs a rubbing operation in a predetermined direction, the first piezoelectric film 111 and the second piezoelectric film 112 alternately receive a pressing operation. Therefore, as shown in FIG. 9C, the fluctuation of the potential detected by the rubbing detection sensor 100 has a sine wave shape. Further, by increasing the speed of the rubbing operation, as shown in FIG. 9D, the pitch of the potential waveform is shortened. Conversely, if the rubbing operation is delayed, the pitch of the potential waveform becomes longer. Thereby, the speed of the rubbing operation can be acquired from the pitch of the detected potential waveform.

As shown in FIG. 9B, the piezoelectric film 51 according to the fifth embodiment is the fourth embodiment except that a pair of regions composed of the first region R1 and the second region R2 are arranged in a circle. The configuration is almost the same as that. That is, the first piezoelectric film 111 and the second piezoelectric film 112 are alternately formed continuously on a circumferential curve. The diameter of the circular circle is preferably 20 mm or more. Usually, when a user draws a circle with a fingertip, the width touched by the fingertip is about 5 mm. For this reason, if the diameter of the circular circle is 20 mm or more, the ring shape formed by the movement of the fingertip becomes clear.

When the user performs a rotary rubbing operation in a predetermined direction as indicated by an arrow, the first piezoelectric film 111 and the second piezoelectric film 112 alternately receive a pressing operation. Therefore, as shown in FIG. 9C, the fluctuation of the potential detected by the rubbing detection sensor 100 has a sine wave shape. In this case, the user can repeat the rotation operation. As a result, a continuous wave-shaped potential is generated as long as the rotation operation is repeated. Therefore, the rubbing detection sensor 100 can also detect the frequency of the wave. Further, when the user changes the rotation speed, the frequency of the detected potential waveform varies. Therefore, the speed of the rubbing operation can be acquired from the frequency of the detected potential waveform.

10A is a cross-sectional view of the rubbing detection sensor according to the sixth embodiment in the XZ plane, and FIG. 10B is a plan view of the rubbing detection sensor according to the seventh embodiment in the XY plane. 10 (C) and (D) are diagrams for explaining the generated potentials in the sixth and seventh embodiments.

As shown in FIG. 10 (A), the piezoelectric element 60 according to the sixth embodiment is the same except that a pair of regions consisting of a first region R1 and a second region R2 are provided at a predetermined interval. The configuration is substantially the same as that of the fourth embodiment. Further, as shown in FIG. 10B, the piezoelectric film 71 according to the seventh embodiment has a pair of regions including the first region R1 and the second region R2 except that the paired regions are provided at a predetermined interval. Has substantially the same configuration as that of the fifth embodiment.

In the sixth embodiment and the seventh embodiment, a pair of regions including the first region R1 and the second region R2 are provided at a predetermined interval. That is, it is the structure by which the pair of the continuous 1st piezoelectric film 111 and the 2nd piezoelectric film 112 is arrange | positioned at predetermined intervals, respectively. In such a configuration, no electric potential is generated even if a pressing operation is accepted at a predetermined interval where the piezoelectric film is not disposed. For example, in the sixth embodiment, when a rubbing operation in the direction of the arrow shown in FIG. 10A, that is, the first direction is accepted, the potential detected by the rubbing detection sensor 100 as shown in FIG. The fluctuation of the waveform becomes a wave shape with a predetermined interval. The detection potential is 0 at a predetermined interval. Further, since the rubbing operation is in the first direction, a large potential is detected in the positive direction. On the other hand, when a reverse rubbing operation in the second direction is accepted, as shown in FIG. 10D, the fluctuation of the potential detected by the rubbing detection sensor 100 is a wave shape with a predetermined interval. In addition, a large potential is detected in the negative direction. Similarly, when a rubbing operation in the clockwise direction of the arrow shown in FIG. 10B, that is, the first direction is accepted in the seventh embodiment, as shown in FIG. The detected potential fluctuation has a wave shape with a predetermined interval, and a large potential is detected in the positive direction. Further, when a rubbing operation in the counterclockwise direction of the arrow shown in FIG. 10B, that is, the second direction is accepted, the potential detected by the rubbing detection sensor 100 is changed as shown in FIG. The fluctuation has a wave shape with a predetermined interval, and a large potential is detected in the negative direction. Therefore, the pair of regions including the first region R1 and the second region R2 are provided at a predetermined interval, so that the direction in which the rubbing operation is accepted can be determined.

FIG. 11A is a perspective view of an electronic device provided with a rubbing detection sensor according to the eighth embodiment, and FIG. 11B is a diagram for explaining the generated potential.

As shown in FIG. 11A, the electronic device 80 has a hemispherical shape. The electronic device 80 includes the above-described rubbing detection sensor. The electronic device 80 includes a pair of the first piezoelectric film 111 and the second piezoelectric film 112 inside. For example, the first piezoelectric film 111 and the second piezoelectric film 112 are radially provided at predetermined intervals on the hemispherical surface portion. When the user touches the surface of the electronic device 80, a pressing operation is applied to the first piezoelectric film 111 and the second piezoelectric film 112. For this reason, as shown by the arrow in FIG. 11A, when the electronic device 80 accepts the rubbing operation, a different potential is detected depending on the operation. Therefore, the direction in which the rubbing operation is accepted as in the above embodiment. The speed of the rubbing operation can be detected. Thereby, adjustment parts, such as temperature and a volume, can be provided to household appliances. In addition, since the rubbing detection sensor 100 can also be used as a switch, it can also be used as a switch in which ON / OFF is associated with the first region R1 or the second region R2. Furthermore, the electronic device 80 is not limited to this shape, and can be set to a three-dimensional shape corresponding to the use state, such as a spherical shape, a rectangular parallelepiped shape, or a cylindrical shape.

Next, Modification 1 of the rubbing detection sensor will be described. FIG. 12A is a perspective view of an electronic apparatus provided with the rubbing detection sensor according to the first modification, FIG. 12B is a plan view of the rubbing detection sensor in FIG. 12A, and FIG. FIG. 12B is a cross-sectional view of the rubbing detection sensor of FIG.

As shown in FIGS. 12A to 12C, the rubbing detection sensor 120 according to the first modification includes a sensor unit 127 and a drawer unit 128. The sensor unit 127 and the drawer unit 128 are attached to the inner wall of the housing 2 of the electronic device 1. The sensor unit 127 and the drawer unit 128 have a base 94 on the housing 2 side. The base 94 is disposed on the first adhesive layer 91, the SUS plate 92, and the second adhesive layer 93 that are laminated from the housing 2 side and bonded to the housing 2. The SUS plate 92 is formed of a material having a low elastic modulus that is less likely to be deformed than the housing 2 or the base 94.

The base 94 has a signal electrode 95 and a ground electrode 96 on the opposite side of the housing 2. The signal electrode 95 and the ground electrode 96 may be disposed so as to be positioned on the base material 94, or may be formed so that at least a part thereof enters the base material 94.

The sensor unit 127 and the lead-out unit 128 further include a third adhesive layer 97, a shield layer 98, and the piezoelectric film 11. On the signal electrode 95, the piezoelectric film 11 is disposed via a third adhesive layer 97. The shield layer 98 is disposed so as to overlap the ground electrode 96 disposed in the lead portion 128. The shield layer 98 is electrically connected to the ground electrode 96. For this reason, the charge generated from the piezoelectric film 11 can be detected by the signal electrode 95 and the ground electrode 96.

Next, a description will be given of a normal time when a pressing operation is received in Modification Example 1 of the rubbing detection sensor, or an abnormal time when the housing 2 is deformed due to a force such as twisting applied to the housing 2. FIG. 13A is a diagram for explaining a normal time when a pressing operation is received in the first modification, and FIGS. 13B and 13C explain an abnormal time when the housing 2 is deformed. It is a figure for doing. Note that in FIGS. 13A to 13C, only portions necessary for the description are shown, and the rest are omitted.

As shown in FIG. 13A, when the portion corresponding to the piezoelectric film 11 in the housing 2 receives a pressing operation, the SUS plate 92, the base material 94, and the piezoelectric film 11 are deformed along with the deformation of the housing 2. . Thereby, the electric charge generated from the piezoelectric film 11 is detected.

On the other hand, as shown in FIG. 13B, when the portion of the housing 2 that does not correspond to the piezoelectric film 11 receives a pressing operation, the housing 2 is deformed. In this case, since the SUS plate 92 is more difficult to deform than the housing 2, the deformation of the housing 2 is not easily transmitted to the SUS plate 92. Even when the base 94 is deformed along with the deformation of the housing 2, the deformation of the base 94 is hardly transmitted to the piezoelectric film 11 due to the presence of the SUS plate 92. Therefore, since the piezoelectric film 11 is not easily deformed, it is possible to prevent erroneous detection without detecting charges.

Similarly, as shown in FIG. 13C, a case where a portion of the housing 2 that does not correspond to the piezoelectric film 11 is deformed to the outside due to the housing receiving a twist or the like. In this case as well, as in the case of FIG. 13B, the presence of the SUS plate 92 makes it difficult for the piezoelectric film 11 to be deformed, so that false detection can be prevented without detecting charges.

In addition, it is better that the SUS plate 92 is disposed in the drawer portion 128. When the SUS plate 92 is not disposed in the drawer portion 128, the deformation of the base material 94 is easily transmitted to the piezoelectric film 11 when the housing 2 is deformed near the sensor portion 127. Thus, the erroneous detection due to unnecessary deformation of the housing 2 can be prevented by the size and arrangement of the SUS plate 92. Next, another modified example 2 and modified example 3 will be described. The description similar to that of the first modification is omitted.

FIG. 14A is a perspective view of an electronic apparatus provided with the rubbing detection sensor according to the second modification, FIG. 14B is a plan view of the rubbing detection sensor in FIG. 14A, and FIG. FIG. 14B is a cross-sectional view of the rubbing detection sensor 14 (B) taken along II-II.

As shown in FIGS. 14A to 14C, in the rubbing detection sensor 1201 according to the second modification, the arrangement of the sensor unit 127 and the drawer unit 128 is different from that of the first modification. The lead portion 128 is drawn vertically from the longitudinal side of the sensor portion 127. For this reason, the drawer portion 128 is not easily deformed because the SUS plate 92 is partially disposed. Accordingly, since the drawer portion 128 is hardly affected by the deformation of the base material 94, it is possible to prevent erroneous detection due to unnecessary deformation of the housing 2.

FIG. 15 is a cross-sectional view for explaining a rubbing detection sensor according to Modification 3.

As shown in FIG. 15, in the rubbing detection sensor according to Modification 3, the configurations of Modification 1 and the base 94 and SUS plate 92 are different. The SUS plate 92 is disposed only in the area of the sensor unit 127. The base 94 is formed so as to be bent toward the housing 2 at the boundary between the sensor unit 127 and the lead-out unit 128 and attached to the first adhesive layer 91.

For this reason, the base material 94 is directly attached to the housing 2 in the drawer portion 128. For this reason, the deformation | transformation of the drawer | drawing-out part 128 is suppressed compared with when the drawer | drawing-out part 128 is not being fixed. For this reason, since the deformation | transformation of the drawer | drawing-out part 128 is hard to be transmitted to the piezoelectric film 11 via the base material 94, the misdetection by an unnecessary deformation | transformation can be prevented.

The SUS plate 92 is preferably sized to cover the smaller end of the piezoelectric film 11 or the signal electrode 95 in plan view, and further sized to cover the end of the shield layer 98. Preferably there is. If the SUS plate 92 does not cover the end of the shield layer 98, the shield layer 98 is stretched when a pressing operation is applied in the vicinity of the shield layer 98. Thereby, a load is applied to the piezoelectric film 11 and the piezoelectric film 11 may be stretched.

Further, SUS, which is a material of the SUS plate 92, is an example, and any material may be used as long as it has a low elastic modulus and is less likely to deform than the casing 2 or the base 94. The SUS plate 92 may function as a ground electrode instead of the ground electrode 96. Moreover, since the SUS board 92 can be formed large and occupies a certain range of the rubbing detection sensor, it can be expected to prevent noise from the housing 2 side.

The description of this embodiment is illustrative in all respects and not restrictive. The scope of the present invention is shown not by the above embodiments but by the claims. Furthermore, the scope of the present invention is intended to include all modifications within the meaning and scope equivalent to the scope of the claims.

DESCRIPTION OF

SYMBOLS

1,80 ...

Electronic device

10, 13, 20, 30, 40, 60, ...

Piezoelectric element

12, 14, 15, 16, 32 ... Electrode 18 ...

Operation detection part

11, 31, 51, 71 ... Piezoelectric film 80 ... Electron Device 100 ... rubbing

detection sensor

111, 311 ... first

piezoelectric film

112, 312 ... second

piezoelectric film

113, 114 ... adjusting piezoelectric element 123 ... first detection electrode 124 ... second detection electrode R1 ... first region R2 ... first Two regions V1 ... first threshold V2 ... second threshold

Claims

A first region for receiving a pressing operation from a user;
A second region that is at least partially adjacent to the first region and receives the pressing operation from the user;
Piezoelectric elements that output potentials of opposite polarities when the pressing operation is received in the first region and when the pressing operation is received in the second region,
An operation detection unit that detects a rubbing operation based on a detection mode of the piezoelectric element in the first region and the second region;
A rubbing detection sensor.
The piezoelectric element is
A first piezoelectric film disposed in the first region;
A second piezoelectric film that is disposed in the second region and generates a potential having a polarity opposite to a potential generated by the first piezoelectric film when the pressing operation is received;
Electrodes formed on both main surfaces of the first piezoelectric film and the second piezoelectric film;
The rubbing detection sensor according to claim 1, further comprising:
The piezoelectric element is
Piezoelectric film,
A first detection electrode disposed in the first region and formed on the first main surface or the second main surface of the piezoelectric film;
A second detection electrode disposed in the second region, formed on the first main surface or the second main surface of the piezoelectric film, and having a polarity different from that of the first detection electrode;
A ground electrode;
The rubbing detection sensor according to claim 1, further comprising:
The operation detection unit is
When the potential detected by the piezoelectric element reaches a predetermined first threshold, it is determined that the user's rubbing operation moves from the first area to the second area,
When the electric potential detected by the piezoelectric element reaches a second threshold value having a polarity different from that of the first threshold value, it is determined that the user's rubbing operation moves from the second region to the first region. The rubbing detection sensor according to claim 3.
The operation detection unit is
When the potential detected by the piezoelectric element reaches a predetermined first threshold, it is determined that the user's rubbing operation moves from the first area to the second area,
When the electric potential detected by the piezoelectric element reaches a second threshold value having the same polarity and different polarity as the first threshold value, it is determined that the user's rubbing operation moves from the second area to the first area. The rubbing detection sensor according to any one of claims 1 to 3.
6. The rubbing detection according to claim 1, further comprising an adjustment piezoelectric element having a polarity opposite to that of each region at an end of a pair of regions including the first region and the second region. Sensor.
The rubbing detection sensor according to any one of claims 1 to 6, wherein the first area and the second area are partially overlapped.
The rubbing detection sensor according to any one of claims 1 to 7, comprising a plurality of pairs of regions including the first region and the second region.
The rubbing detection sensor according to claim 8, wherein at least one region of the pair of regions is provided at a predetermined interval.
The rubbing detection sensor according to any one of claims 1 to 9, wherein the first region and the second region are provided along a straight line, a curve, or a circle.
The rubbing detection sensor according to any one of claims 8 to 10, wherein the operation detection unit acquires a speed of the rubbing operation from a pitch or a frequency in a change in potential detected by the piezoelectric element.
An electronic device comprising the rubbing detection sensor according to any one of claims 1 to 11.