Impact position detection device, impact position detection method, impact position detection program, and impact position detection system

Abstract

To make it possible to detect an impact position where an impact is applied without densely disposing piezoelectric sensors.SOLUTION: An impact position detection device includes: a voltage value acquisition unit that acquires each of voltage values of voltages output from a plurality of piezoelectric sensors of a piezoelectric sheet including a base material and the plurality of piezoelectric sensors which are provided on the base material and each of which outputs a voltage corresponding to the magnitude of a received pressure; a distance acquisition unit that acquires a distance corresponding to a voltage value of a peak voltage of the voltage output from each of the plurality of piezoelectric sensors by using distance information indicating a correspondence between the voltage values of the voltages output from the piezoelectric sensors and a distance from an impact position where an impact is applied to the piezoelectric sheet to the piezoelectric sensors; and an impact position calculation unit that calculates the impact position based on the distance from the impact position to the piezoelectric sensor acquired for each of the plurality of piezoelectric sensors.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present disclosure relates to an impact position detection device, an impact position detection method, an impact position detection program, and an impact position detection system.

Background Art

[0002] Due to the rapid progress of wearable electronic devices such as smartwatches, it has been required to accurately detect the position where an impact is applied.

[0003] Conventionally, devices for detecting impacts using piezoelectric sensors or the like have been proposed. For example, Patent Document 1 discloses an impact detection sheet including an impact sensor composed of a piezoelectric sensor that generates a voltage corresponding to an applied impact, a non-contact type IC module for recording impact information detected by the impact sensor using the voltage output from the impact sensor and the current generated from the voltage when the impact sensor receives an impact equal to or greater than a certain level, and a sheet-like substrate provided with the impact sensor and the IC module.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, when attempting to accurately detect the impact position where an impact is applied by applying the technology described in Patent Document 1 to wearable electronic devices or the like, it is necessary to densely arrange piezoelectric sensors.

[0006] The present disclosure has been made in view of the above points, and an object thereof is to provide an impact position detection device, an impact position detection method, an impact position detection program, and an impact position detection system that can detect an impact position where an impact has been applied without densely arranging piezoelectric sensors.

Means for Solving the Problems

[0007] In order to achieve the above object, an impact position detection device according to the present disclosure includes a base material, and a plurality of piezoelectric sensors provided on the base material, the plurality of piezoelectric sensors each outputting a voltage corresponding to the magnitude of the received pressure, a voltage value acquisition unit that acquires each voltage value of the voltages output from the plurality of piezoelectric sensors of the piezoelectric sheet, and a distance acquisition unit that acquires, for each of the plurality of piezoelectric sensors, a distance corresponding to the voltage value of the peak voltage of the voltage output from each of the plurality of piezoelectric sensors, using distance information indicating a correspondence relationship between the voltage value of the voltage output from the piezoelectric sensor and the distance from the impact position where an impact is applied to the piezoelectric sheet to the piezoelectric sensor, and an impact position calculation unit that calculates the impact position based on the distance from the impact position to the piezoelectric sensor acquired for each of the plurality of piezoelectric sensors.

[0008] Further, the impact position calculation unit may calculate, for each of the plurality of piezoelectric sensors, the center of gravity position of the intersection of the circles drawn with the piezoelectric sensor as the center and the distance as the radius as the impact position.

[0009] Further, when the piezoelectric sheet is partitioned into a predetermined size, the piezoelectric sensor may be provided in a section adjacent to the target section with the target section as the center.

[0010] Further, the piezoelectric sensor is a curable composition containing piezoelectric particles and having flexibility.

[0011] Also, the impact position detection method according to the present disclosure includes a computer acquiring voltage values of voltages output from a plurality of piezoelectric sensors provided on a base material and a piezoelectric sheet having the plurality of piezoelectric sensors each outputting a voltage corresponding to the magnitude of pressure received, respectively, and using distance information indicating a correspondence relationship between the voltage value of the voltage output from the piezoelectric sensor and the distance from the impact position where the impact is applied to the piezoelectric sheet to the piezoelectric sensor, to acquire distances corresponding to the voltage values of the peak voltages of the voltages output from each of the plurality of piezoelectric sensors, respectively, and calculating the impact position based on the distances from the impact position to the piezoelectric sensors acquired for each of the plurality of piezoelectric sensors.

[0012] Also, the impact position detection program according to the present disclosure causes a computer to execute a process including acquiring voltage values of voltages output from a plurality of piezoelectric sensors provided on a base material and a piezoelectric sheet having the plurality of piezoelectric sensors each outputting a voltage corresponding to the magnitude of pressure received, respectively, and using distance information indicating a correspondence relationship between the voltage value of the voltage output from the piezoelectric sensor and the distance from the impact position where the impact is applied to the piezoelectric sheet to the piezoelectric sensor, to acquire distances corresponding to the voltage values of the peak voltages of the voltages output from each of the plurality of piezoelectric sensors, respectively, and calculating the impact position based on the distances from the impact position to the piezoelectric sensors acquired for each of the plurality of piezoelectric sensors.

[0013] Also, the impact position detection system according to the present disclosure includes a base material, a piezoelectric sheet having a plurality of piezoelectric sensors provided on the base material and each outputting a voltage corresponding to the magnitude of pressure received, and the impact position detection device.

Advantages of the Invention

[0014] According to the present disclosure, it is possible to detect the impact position where the impact is applied without arranging the piezoelectric sensors densely.

Brief Description of the Drawings

[0015]

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Embodiments for Carrying Out the Invention

[0016] Hereinafter, an example of this embodiment will be described with reference to the drawings. In each drawing, the same or equivalent components and parts are given the same reference numerals. Also, the dimensions and ratios in the drawings are exaggerated for the convenience of explanation and may be different from the actual ratios.

[0017] FIG. 1 is a plan view of a piezoelectric sheet 10 according to this embodiment. The piezoelectric sheet 10 has a configuration in which a plurality of piezoelectric sensors 14 are provided on a base material 12.

[0018] The piezoelectric sensor 14 outputs a voltage corresponding to the magnitude of the pressure received. As the piezoelectric sensor 14, in this embodiment, as an example, a curable composition containing piezoelectric particles and having flexibility is used. As such a curable composition, the curable compositions described in the following reference documents can be used, but it is not limited thereto.

[0019] (Reference Document) International Publication No. 2023 / 032866

[0020] In the example of FIG. 1, the shape of the base material 12 is flat, but it may have a shape with a curve. Since the piezoelectric sensor 14 has flexibility, the piezoelectric sensor 14 can be attached even if the base material 12 has a shape with a curve. Thus, due to the flexibility of the piezoelectric sensor 14, it can be attached to devices of various shapes such as wearable electronic devices.

[0021] In the example of FIG. 1, the piezoelectric sensors 14 are arranged at equal intervals on the rectangular base material 12. Specifically, when the base material 12 is divided by the square sections 16 formed by a plurality of broken lines in the X direction and the Y direction of FIG. 1, the piezoelectric sensors 14 are arranged in every other section 16 in each of the X direction and the Y direction. Further, the piezoelectric sensors 14 are arranged at the centers of the sections 16. Note that the arrangement of the piezoelectric sensors 14 is not limited to the example of FIG. 1. Details of the arrangement of the piezoelectric sensors 14 will be described later.

[0022] FIG. 2 shows the configuration of the impact position detection system 20. The impact position detection system 20 includes a piezoelectric sheet 10 and an impact position detection device 30. The impact position detection system 20 is connected to a plurality of piezoelectric sensors 14 of the piezoelectric sheet 10. The impact position detection device 30, details of which will be described later, detects the impact position where an impact is applied to the piezoelectric sheet 10 based on the voltage values of the voltages output from the plurality of piezoelectric sensors 14.

[0023] FIG. 3 shows the hardware configuration of the impact position detection device 30. As shown in FIG. 3, the impact position detection device 30 includes a controller 32. The controller 32 is configured by a device including a general computer.

[0024] As shown in FIG. 3, the controller 32 includes a CPU (Central Processing Unit) 32A, a ROM (Read Only Memory) 32B, a RAM (Random Access Memory) 32C, and an input / output interface (I / O) 32D. The CPU 32A, the ROM 32B, the RAM 32C, and the I / O 32D are respectively connected via a bus 32E. The bus 32E includes a control bus, an address bus, and a data bus.

[0025] Further, a communication unit 34 and a storage unit 36 are connected to the I / O 32D.

[0026] The communication unit 34 is an interface for communicating with a plurality of piezoelectric sensors 14 of the piezoelectric sheet 10.

[0027] The storage unit 36 is composed of, for example, a non-volatile semiconductor memory or the like. As shown in FIG. 3, the storage unit 36 stores an impact position detection program 36A, distance information 36B, and the like.

[0028] The CPU 32A is an example of a computer. The computer referred to here means a processor in a broad sense, and includes a general-purpose processor (for example, a CPU), or a dedicated processor (for example, a GPU: Graphics Processing Unit, an ASIC: Application Specific Integrated Circuit, an FPGA: Field Programmable Gate Array, a programmable logic device, etc.).

[0029] Note that the impact position detection program 36A may be stored in a non-volatile non-transitory recording medium, distributed via a network, and appropriately installed in the impact position detection device 30 to be stored in the storage unit 36.

[0030] Examples of the non-volatile non-transitory recording medium include a CD-ROM (Compact Disc Read Only Memory), a magneto-optical disk, an HDD (hard disk drive), a DVD-ROM (Digital Versatile Disc Read Only Memory), a flash memory, a memory card, and the like.

[0031] Here, as shown in FIG. 4, FIG. 5 shows the characteristics of the output voltage of the piezoelectric sensor 14 when a ball 40 made of iron and weighing 100 g is dropped from a height of 100 mm directly above one piezoelectric sensor 14. The horizontal axis in FIG. 5 is time, and the vertical axis is the output voltage (Output Voltage: mV) of the piezoelectric sensor 14. The position with a sharp rise in the output voltage is the moment when the ball 40 collides with the piezoelectric sensor 14. Since the ball 40 has fallen onto the piezoelectric sensor 14 and an impact is applied, the distance between the piezoelectric sensor 14 and the impact position is 0 mm. And since the piezoelectric sensor 14 outputs a voltage corresponding to the magnitude of the pressure received, the output voltage is maximum when the ball 40 falls onto the piezoelectric sensor 14. In the example of FIG. 5, the peak voltage Vp at which the output voltage of the piezoelectric sensor 14 is maximum is 22 mV.

[0032] On the other hand, as shown in FIG. 6, the characteristics of the output voltage of one piezoelectric sensor 14 when the ball 40 falls onto the base material 12 at a position separated from one piezoelectric sensor 14 by a distance Distance and an impact is applied are acquired at each distance, and the acquired data is combined and shown in FIG. 7. The horizontal axis in FIG. 7 is the distance Distance from the piezoelectric sensor 14 to the impact position where the impact is applied by the fall of the ball 40, and the vertical axis is the output voltage (Output Voltage: mV) of the piezoelectric sensor 14. As shown in FIG. 7, the output voltage of the piezoelectric sensor 14 decreases in the order of the distance Distance being 10 mm, 30 mm, 50 mm, and 70 mm. That is, the output voltage of the piezoelectric sensor 14 decreases as the distance Distance decreases. Therefore, based on the peak voltage Vp at which the output voltage of the piezoelectric sensor 14 is maximum, the distance Distance from the piezoelectric sensor 14 to the impact position can be obtained.

[0033] Also, FIGS. 8 to 11 show the characteristics of the output voltage of the piezoelectric sensor 14 when the distance Distance is 10 mm, 30 mm, 50 mm, and 70 mm. The horizontal and vertical axes in FIGS. 8 to 11 are the same as those in FIG. 5. As shown in FIG. 8, the peak voltage Vp of the piezoelectric sensor 14 when the distance Distance is 10 mm is 3 mV. Also, as shown in FIG. 9, the peak voltage Vp of the piezoelectric sensor 14 when the distance Distance is 30 mm is 2.5 mV. Also, as shown in FIG. 10, the peak voltage Vp of the piezoelectric sensor 14 when the distance Distance is 50 mm is 1.2 mV. Also, as shown in FIG. 11, the peak voltage Vp of the piezoelectric sensor 14 when the distance Distance is 70 mm is 0.5 mV.

[0034] FIG. 12 shows a diagram representing the relationship between the distance Distance and the output voltage of the piezoelectric sensor 14 in three dimensions. In FIG. 12, the coordinates (0, 0) are the position of the piezoelectric sensor 14. As shown in FIG. 12, the piezoelectric sensor 14 has the characteristic that the output voltage decreases as the distance Distance from the piezoelectric sensor 14 increases. In other words, the piezoelectric sensor 14 has the characteristic that the output voltage decreases radially as it goes outward with the position of the piezoelectric sensor 14 as the center.

[0035] As shown in FIGS. 11 and 12, in this example, when the distance Distance exceeds 70 mm, the peak voltage Vp of the piezoelectric sensor 14 becomes less than 0.5 mV, and it becomes difficult to detect the distance to the impact position. For this reason, the detection range of the distance to the impact position of the piezoelectric sensor 14 according to this embodiment is up to a maximum distance of 70 mm from the piezoelectric sensor 14. In other words, the detection range of the distance to the impact position of the piezoelectric sensor 14 is a range with a radius of 70 mm centered on the piezoelectric sensor 14. Note that the detection range of the distance to the impact position of the piezoelectric sensor 14 becomes wider if the sensitivity of the piezoelectric sensor 14 is high, and becomes wider as the mass of the ball 40 and the drop height, that is, the impact force of the ball 40, increase. In addition, the detection range also changes depending on the material of the base material 12 and the like.

[0036] Here, the arrangement of the piezoelectric sensor 14 will be described. In the example of FIG. 1, the size of the partition 16 is 30 mm × 30 mm. Then, focusing on the central partition 16A, the piezoelectric sensors 14 provided in the partitions 16 adjacent to the partition 16A (the partition of interest) centered on the partition 16A are, for convenience, referred to as piezoelectric sensors A to D. Note that the distance between the piezoelectric sensors 14 in the partitions 16 adjacent to the partitions 16 where the piezoelectric sensor 14 does not exist is about 60 mm. As described above, the detection range of the distance to the impact position of the piezoelectric sensors A to D is a range of a radius of 70 mm centered on the piezoelectric sensors A to D, and is indicated by detection ranges 18A to 18D shown as dashed circles in FIG. 1. Note that the distance between the piezoelectric sensors 14 may be changed according to the detection range of the piezoelectric sensor 14, and it is preferable that the distance is shorter than the detection range of the piezoelectric sensor 14.

[0037] As will be described later, the detection of the impact position is calculated based on the intersections of the detection ranges 18A to 18D drawn as circles, and the overlapping range 19 of the detection ranges 18A to 18D becomes the range where the impact position can be detected. Note that the overlapping range 19 is about 70 mm × 70 mm in the example of FIG. 1. Note that this overlapping range 19 may be appropriately changed according to the detection range, but it is preferable that the distance of one side of the overlapping range 19 is in a range equivalent to the detection range.

[0038] As shown in FIG. 1, when the piezoelectric sheet 10 is partitioned into a predetermined size, by providing the piezoelectric sensor 14 in the partition 16 adjacent to the partition of interest centered on the partition of interest, the overlapping range 19 can be increased, so that it becomes possible to accurately detect the impact position.

[0039] In this embodiment, as a preparatory step, by changing the position where the ball 40 is dropped onto the piezoelectric sheet 10 in various ways and measuring the output voltage of the piezoelectric sensor 14, measurement data of various combinations of the distance Distance and the output voltage are acquired. Then, based on the acquired measurement data, a relational expression representing the relationship between the output voltage of the piezoelectric sensor 14 and the distance from the piezoelectric sensor 14 is obtained by, for example, multiple regression analysis.

[0040] The above relational expression can be represented by a cubic equation as follows, where the voltage value of the output voltage of the piezoelectric sensor 14 is U and the distance from the piezoelectric sensor 14 is r.

[0041] U = a × r 3 + b × r 2 + c × r + d ···(1)

[0042] Here, a, b, c, and d are coefficients calculated by multiple regression analysis. Note that the relational expression representing the relationship between the output voltage of the piezoelectric sensor 14 and the distance from the piezoelectric sensor 14 is not limited to the above equation (1).

[0043] In this embodiment, the above equation (1) is stored in advance in the storage unit 36 as distance information 36B indicating the correspondence between the voltage value of the voltage output from the piezoelectric sensor 14 and the distance from the piezoelectric sensor 14 to the impact position where an impact is applied to the piezoelectric sheet 10. Note that instead of the above equation (1), table data representing the relationship between the output voltage of the piezoelectric sensor 14 and the distance from the piezoelectric sensor 14 may be stored in the storage unit 36 as the distance information 36B.

[0044] FIG. 13 is a block diagram showing the functional configuration of the CPU 32A of the impact position detection device 30. As shown in FIG. 13, the CPU 32A functionally includes functional units such as a voltage value acquisition unit 50, a distance acquisition unit 52, and an impact position calculation unit 54.

[0045] The CPU 32A functions as each functional unit shown in FIG. 13 by reading and executing the impact position detection program 36A stored in the storage unit 36.

[0046] The voltage value acquisition unit 50 acquires the voltage values of the voltages output from the plurality of piezoelectric sensors 14 respectively.

[0047] The distance acquisition unit 52 acquires, using the distance information 36B, the distances corresponding to the voltage values of the voltages output from each of the plurality of piezoelectric sensors 14. Specifically, by substituting the voltage value U of the voltage output from the plurality of piezoelectric sensors 14 into the above formula (1) respectively and solving the above formula (1) respectively, the distance r from the impact position to the piezoelectric sensor 14 is calculated. Such calculation of the distance r is performed for each of the plurality of piezoelectric sensors 14.

[0048] The impact position calculation unit 54 calculates the impact position based on the distance r from the impact position to the piezoelectric sensor 14 acquired for each of the plurality of piezoelectric sensors 14.

[0049] Specifically, for each of the plurality of piezoelectric sensors 14, when drawing a circle with the distance r from the impact position to the piezoelectric sensor 14 as the radius centered on the piezoelectric sensor 14, the impact position calculation unit 54 calculates the centroid position of the intersections of the circles drawn for each of the plurality of piezoelectric sensors 14 as the impact position. Note that the piezoelectric sensors 14 for which the distance r cannot be calculated because the voltage value U is less than a predetermined threshold value are excluded from the calculation of the impact position. The threshold value is 0.5 mV as a matter of course in this embodiment.

[0050] Here, when the number of intersections of the circles with the distance from each of the piezoelectric sensors 14 for which the distance r could be calculated to the impact position as the radius is n (i = 1, 2, ···, n), the centroid position JPEG2025089138000002.jpg1223 is represented by the following formula.

[0051] JPEG2025089138000003.jpg1794···(2) Here, x i , y i are the x and y coordinates at the intersection point i.

[0052] That is, the average value of the x coordinates of the n intersections and the average value of the y coordinates of the n intersections are the coordinates of the centroid position. In this embodiment, this centroid position is taken as the impact position.

[0053] FIG. 14 shows an example of calculating the impact position IL. Here, for simplicity of explanation, a case where piezoelectric sensors 14 are provided in sections 2, 4, 6, and 8 out of the nine sections 1 to 9 will be described. Note that the size of each section is 3 cm × 3 cm. Here, for convenience, the piezoelectric sensor 14 provided in section 2 is referred to as Sensor1, the piezoelectric sensor 14 provided in section 4 is referred to as Sensor2, the piezoelectric sensor 14 provided in section 6 is referred to as Sensor3, and the piezoelectric sensor 14 provided in section 8 is referred to as Sensor4.

[0054] FIG. 15 shows the output voltages of Sensors 1 to 4. As shown in FIG. 15, the output voltages of Sensors 1 and 2 are relatively high, and the output voltages of Sensors 3 and 4 are relatively low.

[0055] As shown in FIG. 14, the center of gravity position of the intersection of the circle C1 drawn with the distance r1 from Sensor1 to the impact position as the radius, the circle C2 drawn with the distance r2 from Sensor2 to the impact position as the radius, the circle C3 drawn with the distance r3 from Sensor3 to the impact position as the radius, and the circle C4 drawn with the distance r4 from Sensor4 to the impact position as the radius is the impact position IL.

[0056] FIG. 16 shows another example of the impact position IL. Also, FIG. 17 shows the output voltages of Sensors 1 to 4 in FIG. 16. As shown in FIG. 17, the output voltage of Sensor1 is the highest, followed by the output voltages of Sensors 2 and 3, and the output voltage of Sensor4 is the lowest. Therefore, as shown in FIG. 16, the impact position IL is a position close to Sensor1.

[0057] FIG. 18 shows another example of the impact position IL. Also, FIG. 19 shows the output voltages of Sensors 1 to 4 in FIG. 18. As shown in FIG. 19, the output voltages of Sensors 1 to 4 are almost the same. Therefore, as shown in FIG. 18, the impact position IL is the center position of section 5, which is at almost the same distance from Sensors 1 to 4.

[0058] Next, the operation of the impact position detection device 30 according to the present embodiment will be described. FIG. 20 is a flowchart showing the flow of impact position detection processing executed by the CPU 32A of the impact position detection device 30. By the CPU 32A reading the impact position detection program 36A from the storage unit 36, expanding it in the RAM 32C, and executing it, the CPU 36A functions as each functional configuration of the impact position detection device 30, and the impact position detection processing shown in FIG. 20 is executed.

[0059] In step S100, the CPU 32A, as the voltage value acquisition unit 50, acquires the voltage values of the voltages output from the plurality of piezoelectric sensors 14 respectively.

[0060] In step S101, the CPU 32A, as the distance acquisition unit 52, uses the distance information 36B to acquire the distances corresponding to the voltage values of the voltages output from each of the plurality of piezoelectric sensors 14 respectively. That is, by substituting the voltage value U of the voltage output from the piezoelectric sensor 14 into the above formula (1) and solving the above formula (1), the distance r from the impact position to the piezoelectric sensor 14 is calculated.

[0061] In step S102, the CPU 32A, as the impact position calculation unit 54, calculates the impact position IL based on the distance r from the impact position to the piezoelectric sensor 14 acquired for each of the plurality of piezoelectric sensors 14. That is, when a circle is drawn with the piezoelectric sensor 14 as the center and the distance r from the impact position to the piezoelectric sensor 14 as the radius for each of the plurality of piezoelectric sensors 14, the center of gravity position of the intersection points of the circles drawn for each of the plurality of piezoelectric sensors 14 is calculated as the impact position. The calculated impact position is stored in the storage unit 36, for example.

[0062] As described above, the impact position detection device 30 according to the present embodiment acquires the voltage values of the voltages output from the plurality of piezoelectric sensors 14, and uses the distance information 36B to acquire the distances corresponding to the voltage values of the voltages output from each of the plurality of piezoelectric sensors 14. For each of the plurality of piezoelectric sensors 14, when a circle is drawn with the distance r from the impact position to the piezoelectric sensor 14 as the radius centered on the piezoelectric sensor 14, the center-of-gravity position of the intersection of the circles drawn for each of the plurality of piezoelectric sensors 14 is calculated as the impact position.

[0063] Thereby, it is possible to detect the impact position where the impact is applied without arranging the piezoelectric sensors 14 densely.

[0064] Note that the impact position detection process executed by the CPU by reading software (program) in the above embodiment may be executed by various processors other than the CPU. Examples of the processor in this case include a PLD (Programmable Logic Device) whose circuit configuration can be changed after manufacturing such as an FPGA, and a dedicated electric circuit which is a processor having a circuit configuration dedicated to executing a specific process such as an ASIC. Further, the impact position detection process may be executed by one of these various processors, or may be executed by a combination of two or more processors of the same type or different types (for example, a plurality of FPGAs, and a combination of a CPU and an FPGA). Further, the hardware structure of these various processors is more specifically an electric circuit combining circuit elements such as semiconductor elements.

[0065] The following supplementary notes are disclosed regarding the above embodiment.

[0066] (Supplementary Note 1) A voltage value acquisition unit that acquires each of the voltage values of the voltages output from the plurality of piezoelectric sensors of a piezoelectric sheet including a base material and the plurality of piezoelectric sensors provided on the base material, each of which outputs a voltage corresponding to the magnitude of the received pressure; Using distance information indicating the correspondence between the voltage value of the voltage output from the piezoelectric sensor and the distance from the impact position where the impact is applied to the piezoelectric sheet to the piezoelectric sensor, a distance acquisition unit that acquires, for each of the plurality of piezoelectric sensors, the distance corresponding to the peak voltage value of the voltage output from each of the plurality of piezoelectric sensors; An impact position calculation unit that calculates the impact position based on the distance from the impact position to the piezoelectric sensor acquired for each of the plurality of piezoelectric sensors; An impact position detection device including: (Additional item 2) For each of the plurality of piezoelectric sensors, when drawing a circle with the piezoelectric sensor as the center and the distance as the radius, the impact position calculation unit calculates the centroid position of the intersection of the circles drawn for each of the plurality of piezoelectric sensors as the impact position The impact position detection device according to Additional item 1. (Additional item 3) When the piezoelectric sheet is partitioned into a predetermined size, piezoelectric sensors are provided in the sections adjacent to the target section centered on the target section. The impact position detection device according to Additional item 1 or Additional item 2. (Additional item 4) The piezoelectric sensor is a curable composition containing piezoelectric particles and having flexibility. The impact position detection device according to any one of Additional items 1 to 3. (Additional item 5) A computer Acquires the voltage values of the voltages output from the plurality of piezoelectric sensors of a piezoelectric sheet including a base material and a plurality of piezoelectric sensors provided on the base material, each of which outputs a voltage corresponding to the magnitude of the pressure received; Using distance information indicating the correspondence between the voltage value of the voltage output from the piezoelectric sensor and the distance from the impact position where the impact is applied to the piezoelectric sheet to the piezoelectric sensor, acquires, for each of the plurality of piezoelectric sensors, the distance corresponding to the peak voltage value of the voltage output from each of the plurality of piezoelectric sensors; Calculates the impact position based on the distance from the impact position to the piezoelectric sensor acquired for each of the plurality of piezoelectric sensors. An impact position detection method for executing a process including the following. (Appended Claim 6) Causing a computer to acquire voltage values of voltages output from a plurality of piezoelectric sensors of a piezoelectric sheet including a base material and the plurality of piezoelectric sensors provided on the base material, each of which outputs a voltage corresponding to the magnitude of the pressure received, using distance information indicating a correspondence relationship between the voltage value of the voltage output from the piezoelectric sensor and the distance from the impact position where the impact is applied to the piezoelectric sheet to the piezoelectric sensor, acquire distances corresponding to the voltage values of the peak voltages of the voltages output from each of the plurality of piezoelectric sensors, calculate the impact position based on the distances from the impact position acquired for each of the plurality of piezoelectric sensors to the piezoelectric sensors. An impact position detection program for causing a process including the following to be executed. (Appended Claim 7) A piezoelectric sheet including a base material and a plurality of piezoelectric sensors provided on the base material, each of which outputs a voltage corresponding to the magnitude of the pressure received, the impact position detection device according to any one of Claims 1 to 4, and an impact position detection system including the same.

Explanation of Reference Numerals

[0067] 10 Piezoelectric sheet 12 Base material 14 Piezoelectric sensor 16 Compartment 20 Impact position detection system 30 Impact position detection device 36A Impact position detection program 36B Distance information 40 Ball 50 Voltage value acquisition unit 52 Distance acquisition unit 54 Impact position calculation unit IL Impact position

Claims

1. A piezoelectric sheet comprising a base material and a plurality of piezoelectric sensors provided on the base material, the plurality of piezoelectric sensors each outputting a voltage corresponding to the magnitude of the pressure received, and a voltage value acquisition unit that acquires each of the voltage values of the voltages output from the plurality of piezoelectric sensors of the piezoelectric sheet; A distance acquisition unit that acquires, for each of the plurality of piezoelectric sensors, a distance corresponding to the voltage value of the peak voltage of the voltage output from each of the plurality of piezoelectric sensors, using distance information indicating a correspondence relationship between the voltage value of the voltage output from the piezoelectric sensor and the distance from the impact position where the piezoelectric sheet is impacted to the piezoelectric sensor; An impact position calculation unit that calculates the impact position based on the distance from the impact position acquired for each of the plurality of piezoelectric sensors to the piezoelectric sensor; An impact position detection device including the above.

2. For each of the plurality of piezoelectric sensors, when a circle is drawn with the piezoelectric sensor as the center and the distance as the radius, the impact position calculation unit calculates the centroid position of the intersection of the circles drawn for each of the plurality of piezoelectric sensors as the impact position. The impact position detection device according to Claim 1.

3. When the piezoelectric sheet is partitioned into a predetermined size, the piezoelectric sensors are provided in the sections adjacent to the target section centered on the target section. The impact position detection device according to Claim 1.

4. The piezoelectric sensor is a curable composition containing piezoelectric particles and having flexibility. The impact position detection device according to Claim 1.

5. A computer performs acquiring each of the voltage values of the voltages output from a plurality of piezoelectric sensors provided on a base material of a piezoelectric sheet, the plurality of piezoelectric sensors each outputting a voltage corresponding to the magnitude of the pressure received, acquiring, for each of the plurality of piezoelectric sensors, a distance corresponding to the voltage value of the peak voltage of the voltage output from each of the plurality of piezoelectric sensors, using distance information indicating a correspondence relationship between the voltage value of the voltage output from the piezoelectric sensor and the distance from the impact position where the piezoelectric sheet is impacted to the piezoelectric sensor, calculating the impact position based on the distance from the impact position acquired for each of the plurality of piezoelectric sensors to the piezoelectric sensor, and executing a process including the above. An impact position detection method.

6. On a computer, A piezoelectric sheet comprising a base material and a plurality of piezoelectric sensors provided on the base material, the plurality of piezoelectric sensors each outputting a voltage corresponding to the magnitude of the pressure received, and obtaining the voltage values of the voltages output from the plurality of piezoelectric sensors of the piezoelectric sheet, using distance information indicating a correspondence relationship between the voltage value of the voltage output from the piezoelectric sensor and the distance from the impact position where the piezoelectric sheet is impacted to the piezoelectric sensor, obtaining the distance corresponding to the voltage value of the peak voltage of the voltage output from each of the plurality of piezoelectric sensors, calculating the impact position based on the distance from the impact position obtained for each of the plurality of piezoelectric sensors to the piezoelectric sensor, An impact position detection program that causes a process including this to be executed.

7. A piezoelectric sheet comprising a base material and a plurality of piezoelectric sensors provided on the base material, the plurality of piezoelectric sensors each outputting a voltage corresponding to the magnitude of the pressure received, and an impact position detection device according to any one of claims 1 to 4, An impact position detection system including.

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