Stretchable device

Abstract

A stretchable device includes a first layer device, a second layer device, and a first adhesive layer. The first layer device includes a first stretchable substrate including a first strain gauge. The second layer device includes a second stretchable substrate including a second strain gauge. The first stretchable substrate includes a plurality of first long strip hinge portions extending in a first direction. The second stretchable substrate includes a plurality of second long strip hinge portions. The first long strip hinge portion includes a plurality of first body portions overlapping the second long strip hinge portion when viewed in a thickness direction, and a first hinge portion connecting the plurality of first body portions to each other. The second long strip hinge portion includes a second body portion overlapping the first body portion when viewed in the thickness direction, and a second hinge portion connecting the plurality of second body portions to each other.

Description

Technical Field

[0001] This invention relates to stretchable devices. Background Technology

[0002] The stretchable device has a stretchable substrate with excellent extensibility and flexibility. The stretchable substrate includes a resin substrate and an array of layers disposed along the resin substrate. The stretchable substrate has main body portions arranged in a matrix and hinge portions connecting the main body portions to each other. The hinge portion of Patent Document 1 has multiple arcuate portions, forming a meandering curve shape. For example, if a tensile load is applied to the stretchable substrate, the arcuate portions of the hinge portion expand. As a result, the main body portions connected to both ends of the hinge portion move away from each other, and the stretchable substrate elongates. Furthermore, there are two types of hinge portions extending from one main body portion. One is a longitudinal hinge portion that extends along a planar direction to extend the stretchable substrate. The other is a transverse hinge portion that extends along a direction orthogonal to the longitudinal hinge portion in the planar direction.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2020-202208 Summary of the Invention

[0006] In addition, in recent years, to detect the load acting on stretchable devices, strain gauges have been installed in the hinge section to detect the strain (deformation) of the hinge section. However, according to conventional structures, the detectable load direction is limited to the directions extending from the longitudinal and transverse hinge sections. Therefore, it is desirable to develop stretchable devices with a high degree of freedom in the direction of the detected load.

[0007] The purpose of this invention is to provide a stretchable device with a high degree of freedom in the direction of the detected load.

[0008] A stretchable device according to one aspect of this disclosure includes: a first layer device; a second layer device overlapping the first layer device in the thickness direction; and a first adhesive layer disposed between the first layer device and the second layer device. The first layer device includes: a first stretchable substrate having a first strain gauge; and a first elastic resin covering the first stretchable substrate. The second layer device includes: a second stretchable substrate having a second strain gauge; and a second elastic resin covering the second stretchable substrate. The first stretchable substrate has a plurality of first elongated hinge portions extending in a first direction parallel to the plane direction extending from the first layer device. The second stretchable substrate has a plurality of second elongated hinge portions extending in a first intersecting direction parallel to the plane direction and intersecting the first direction. The plurality of first elongated hinge portions are spaced apart in the direction parallel to the plane direction and intersecting the first direction. The plurality of second elongated hinge portions are arranged at intervals in a direction parallel to the planar direction and intersecting the first intersecting direction. When viewed from the thickness direction, the plurality of first elongated hinge portions and the plurality of second elongated hinge portions intersect each other. Each first elongated hinge portion has: a plurality of first main body portions that overlap with the second elongated hinge portions when viewed from the thickness direction; and a first hinge portion connecting the plurality of first main body portions to each other and equipped with the first strain gauge. Each second elongated hinge portion has: a second main body portion that overlaps with the first main body portion when viewed from the thickness direction; and a second hinge portion connecting the plurality of second main body portions to each other and equipped with the second strain gauge. Attached Figure Description

[0009] Figure 1 This is a perspective view of the stretchable device according to Embodiment 1.

[0010] Figure 2 This is a perspective view of the first layer device in Implementation Method 1.

[0011] Figure 3 This is a schematic cross-sectional view showing a section obtained by cutting the first layer device of Embodiment 1 along the second direction; more specifically, it schematically shows a section obtained by cutting the first layer device of Embodiment 1 along the second direction. Figure 2 A cross-sectional view of the first layer device obtained by cutting the III-III line in Embodiment 1.

[0012] Figure 4 This is an enlarged view of a portion of the first detection area of ​​the first stretchable substrate of Embodiment 1.

[0013] Figure 5 This is an enlarged view of the first hinge portion of Embodiment 1.

[0014] Figure 6This is an enlarged view of the case where a tensile load in the first direction is applied to the first hinge portion of Embodiment 1.

[0015] Figure 7 This is a schematic diagram showing the circuit configuration of the strain detection circuit in Embodiment 1.

[0016] Figure 8 This is a cross-sectional view of a stretchable device, specifically along... Figure 11 The sectional view obtained by cutting along line VIII-VIII.

[0017] Figure 9 This is a top view of a portion of the second stretchable substrate of Embodiment 1.

[0018] Figure 10 This is a top view of a portion of the third stretchable substrate of Embodiment 1.

[0019] Figure 11 This is a schematic diagram showing the overlapping state of the first long hinge portion, the second long hinge portion, and the third long hinge portion in Embodiment 1, viewed from the first thickness direction.

[0020] Figure 12 It is a cross-sectional view obtained by cutting along the thickness direction of the stretchable device in the modified example. Detailed Implementation

[0021] Referring to the accompanying drawings, the methods (implementations) for carrying out this disclosure are described in detail. The invention of this disclosure is not limited to the content described in the following embodiments. Furthermore, the constituent elements described below include constituent elements readily conceived by those skilled in the art, as well as substantially the same constituent elements. Moreover, the constituent elements described below can be appropriately combined. Furthermore, this disclosure is merely an example, and appropriate modifications that maintain the spirit of the invention and are readily conceived by those skilled in the art are naturally included within the scope of this invention. Additionally, to make the description clearer, the drawings may schematically show the width, thickness, shape, etc., of various parts compared to the actual form, but this is merely an example and does not limit the interpretation of the invention. Furthermore, in this specification and the drawings, the same reference numerals are used for the same constituent elements as those described with respect to previously presented figures, and detailed descriptions are sometimes appropriately omitted.

[0022] Furthermore, in this specification and claims, when describing the configuration of other structures on top of a certain structure, the phrase "on top of" includes, unless otherwise specified, both the case of configuring other structures directly above a certain structure in connection with it and the case of configuring other structures above a certain structure while separated by other structures.

[0023] (Implementation Method 1)

[0024] Figure 1 This is a perspective view of the stretchable device according to Embodiment 1. The stretchable device 1000 has a surface 1001 and a back surface 1002 facing the opposite direction to the surface 1001. Figure 1 Not illustrated. See reference. Figure 11 Furthermore, the thickness between the surface 1001 and the back surface 1002 of the stretchable device 1000 is relatively thin. Also, the stretchable device 1000 is capable of detecting loads in a planar direction parallel to the surface 1001 (e.g., see reference). Figure 1 The device is an F1 type. Hereinafter, the direction in which the surface 1001 and the back surface 1002 are configured will be referred to as the thickness direction.

[0025] The stretchable device 1000 is formed as a square (quadrilateral) when viewed from the thickness direction. Therefore, the surface 1001 of the stretchable device 1000 has a pair of first sides 1003 and a pair of second sides 1004. Hereinafter, the direction parallel to the planar direction and parallel to the first side 1003 will be referred to as the first direction X, and the direction parallel to the second side 1004 will be referred to as the second direction Y.

[0026] From a top view, the stretchable device 1000 is divided into a detection area 1005 and an outer frame area 1006 excluding the detection area 1005. The detection area 1005 is the area for detecting the load input to the stretchable device 1000. In this embodiment, the detection area 1005 is located at the center of the stretchable device 1000 and is formed as a quadrilateral from a top view. The outer frame area 1006 is formed as a quadrilateral from a top view, and the detection area 1005 is disposed inside it. It should be noted that... Figure 1 In order to facilitate understanding of the boundary between the detection area 1005 and the outer frame area 1006, a boundary line L1 was drawn.

[0027] The stretchable device 1000 is a device that integrates three devices by sequentially stacking them and bonding them together with an adhesive layer. Specifically, the stretchable device 1000 has a first layer device 1, a first adhesive layer 2, a second layer device 101, a second adhesive layer 3, and a third layer device 201 stacked sequentially along the thickness direction. It should be noted that, regarding the thickness direction, the direction in which the first layer device 1 is positioned when viewed from the second layer device 101 is referred to as the first thickness direction Z1, and the direction in which the third layer device 201 is positioned is referred to as the second thickness direction Z2. Furthermore, in the following description, the first layer device 1, the second layer device 100, and the third layer device 200 are sometimes collectively referred to as the three devices. Next, the components of the stretchable device 1000 will be described.

[0028] Figure 2 This is a perspective view of the first layer device in Embodiment 1. (As shown...) Figure 2As shown, the surface of the first layer device 1 in the first thickness direction Z1 constitutes the surface 1001 of the stretchable device 1000. In top view, the first layer device 1 is divided into a first detection region 5 overlapping with the detection region 1005, and a first outer frame region 6 overlapping with the outer frame region 1006. It should be noted that... Figure 2 In order to facilitate understanding of the boundary between the first detection area 5 and the first outer frame area 6, a boundary line L2 was drawn.

[0029] Figure 3 This is a schematic cross-sectional view showing a section obtained by cutting the first layer device of Embodiment 1 along the second direction; more specifically, it schematically shows a section obtained by cutting the first layer device of Embodiment 1 along the second direction. Figure 2 A cross-sectional view of the first layer device obtained by sectioning along line III-III in Embodiment 1. (See attached image.) Figure 2 As shown, the first layer device 1 includes a first elastic resin 8 and a first stretchable substrate 10.

[0030] The first stretchable resin 8 includes two back-side stretchable resin plates 60 and a front-side stretchable resin plate 70 that clamp the first stretchable substrate 10 from both sides in the thickness direction. The back-side stretchable resin plates 60 and the front-side stretchable resin plate 70 possess insulation, stretchability, and flexibility. Acrylic elastomers can be cited as examples of resins used for the back-side stretchable resin plates 60 and the front-side stretchable resin plate 70. It should be noted that the stretchable resin disclosed herein is not limited to acrylic elastomers, and may also be acrylic resin, epoxy resin, polyurethane resin, etc., without particular limitation.

[0031] The back-side stretchable resin plate 60 and the front-side stretchable resin plate 70 are formed in a plate shape and extend in the planar direction. A frame portion 71 protruding in the second thickness direction Z2 is provided at the edge of the front-side stretchable resin plate 70. The frame portion 71 is formed in a ring shape when viewed from above, surrounding the outer periphery of the first stretchable substrate 10. The surface 72 of the frame portion 71 in the second thickness direction Z2 is bonded to the surface of the back-side stretchable resin plate 60 in the first thickness direction Z1. Thus, the back-side stretchable resin plate 60 and the front-side stretchable resin plate 70 cooperate to form a housing that accommodates the first stretchable substrate 10.

[0032] Figure 4 This is an enlarged view of a portion of the first detection area of ​​the first stretchable substrate of Embodiment 1. (As shown...) Figure 4 As shown, in the first stretchable substrate 10, a plurality of removal holes 9 are provided in the area overlapping with the first detection region 5. Figure 3 As shown, the removal hole 9 penetrates the first stretchable substrate 10 in the thickness direction. Furthermore, the removal hole 9 of the first stretchable substrate 10 is filled with the first elastic resin 8. Therefore, the first stretchable substrate 10 has low rigidity under planar loads.

[0033] In this embodiment, the removal hole 9 is provided on the protrusion 73 of the surface elastic resin plate 70 (see reference). Figure 3 ) Filling. However, in this disclosure, it may also be filled by the protrusion provided on the back side elastic resin plate 60, or by elastic resin other than the back side elastic resin plate 60 and the front side elastic resin plate 70, or the removal hole 9 may not be filled but become a space.

[0034] like Figure 4 As shown, in top view, the removal hole 9 extends in the first direction X1. Therefore, the area of ​​the first stretchable substrate 10 that overlaps with the first detection area 5 is constituted by a plurality of first elongated hinge portions 11 extending in the first direction X. Furthermore, the plurality of first elongated hinge portions 11 are arranged at equal intervals in a direction intersecting the first direction X (the second direction Y). Therefore, the first stretchable substrate 10 does not have a portion extending in the second direction Y in the area overlapping with the first detection area 5.

[0035] The first long hinge portion 11 is divided into a plurality of first main body portions 12 arranged at equal intervals in the first direction X, and a plurality of first hinge portions 13 extending in the first direction X while meandering.

[0036] Figure 5 This is an enlarged view of the first hinge portion of Embodiment 1. The first main body portion 12 is configured to be a quadrilateral in plan view, with its four corners facing the first direction X and the second direction Y. It should be noted that the shape of the first main body portion 12 in plan view is not limited to a quadrilateral, but may also be a circle or other polygons.

[0037] The first hinge portion 13 has four curved portions 14, which extend in the first direction X while meandering. Each curved portion 14 in this embodiment is arc-shaped. It should be noted that the curved portions in this disclosure may not be arc-shaped, but rather angular. Furthermore, the number of curved portions is not limited to four.

[0038] The four curved portions 14 are, in sequence, a first arc portion 15, a second arc portion 16, a third arc portion 17, and a fourth arc portion 18 arranged in the first direction X. The first arc portion 15 and the fourth arc portion 18 are quarter-circles bent at 90 degrees. The second arc portion 16 and the third arc portion 17 are semi-circles bent at 180 degrees.

[0039] In addition, the first hinge portion 13 has a straight base portion 19a that connects the first main body portion 12 and the first arc portion 15, and a straight base portion 19b that connects the first main body portion 12 and the fourth arc portion 18.

[0040] Figure 6 This is an enlarged view showing the case where a tensile load in the first direction acts on the first hinge portion of Embodiment 1. (As shown) Figure 6 As shown, when the tensile load in the first direction X (refer to...) Figure 6 When the arrow (W) acts on the first hinge portion 13 (the first long hinge portion 11), the first arc portion 15, the second arc portion 16, the third arc portion 17, and the fourth arc portion 18 deform in a manner that reduces curvature. As a result, the distance from one end to the other of the first hinge portion 13 increases, and the first main body portion 12 moves away from each other.

[0041] Furthermore, although not specifically illustrated, when a compressive load in the first direction X is applied to the first hinge portion 13, the first arc portion 15, the second arc portion 16, the third arc portion 17, and the fourth arc portion 18 deform in a manner that increases their curvature. As a result, the distance from one end to the other of the first hinge portion 13 decreases, and the first main body portions 12 move closer to each other.

[0042] The first detection region 5 of the first stretchable substrate 10 has been described above. On the other hand, the area overlapping the first outer frame region 6 in the first stretchable substrate 10 is not shown, but this area is formed in a frame shape. It should be noted that the area overlapping the first outer frame region 6 in the first stretchable substrate 10 can also be formed in a frame shape by splicing multiple main body parts and multiple hinge parts, and there is no particular limitation in this disclosure.

[0043] like Figure 2 As shown, the first stretchable substrate 10 has a resin substrate 20 and an array layer 21. The resin substrate 20 is the substrate used to manufacture the array layer 21 and has stretchability, flexibility, and insulation. The resin substrate 20 is made of a resin material such as polyimide.

[0044] The array layer 21 is disposed on the surface of the resin substrate 20 in the first thickness direction Z1. The array layer 21 has multiple insulating layers (not shown) stacked in the thickness direction, and a circuit (strain detection circuit) that ensures insulation from the outside through the multiple insulating layers. Next, the details of the strain detection circuit included in the array layer 21 will be described.

[0045] Figure 7 This is a schematic diagram showing the circuit configuration of the strain detection circuit in Embodiment 1. For example... Figure 7 As shown, the portion of the array layer 21 disposed in the first detection region 5 includes a first strain gauge 30, a transistor 40, a gate line 41, a signal line 42, a current supply line 43, and a connection portion 50 (see reference). Figure 2 ), Gate line drive circuit 51 (refer to) Figure 2 ), Signal line selection circuit 52 (refer to) Figure 2 ) and reference current wiring 53 (refer to Figure 2 ).

[0046] The first strain gauge 30 is disposed on the first hinge portion 13 and is a detection element that expands and contracts in response to the strain generated by the first hinge portion 13, and whose resistance value increases or decreases. One end 31 and the other end 32 of the first strain gauge 30 are separately disposed on two adjacent first main body portions 12 along the first direction X1. It should be noted that the first strain gauge 30 in this embodiment is composed of a single strain gauge, but in this disclosure, it can also be two strain gauges, that is, strain gauges that extend from the first main body portion 12 along the first hinge portion 13 and then return to the first main body portion 12. Therefore, compared with the case of a single strain gauge, more strain can be detected, and the detection sensitivity is higher.

[0047] Transistor 40 is a switching element disposed in each of the first main body portions 12. Gate lines 41, signal lines 42, and current supply lines 43 are disposed across multiple first hinge portions 13 and multiple first main body portions 12, extending in the first direction X. The number of gate lines 41 relative to a first elongated hinge portion 11 is the same as the number of transistors 40. That is, one end of each of the multiple gate lines 41 extends to the first main body portion 12 where the corresponding transistor 40 is disposed, and connects to the gate electrode of the transistor 40.

[0048] One signal line 42 and one current supply line 43 are each provided opposite to an elongated hinge portion. The signal line 42 is connected to the other end 32 of the first strain gauge 30 in each main body portion. The current supply line 43 is connected to the drain electrode of the transistor 40 in each main body portion. In addition, the source electrode of the transistor 40 is connected to one end 31 of the first strain gauge 30.

[0049] Therefore, when gate line 41 is scanned, transistor 40 is turned on. As a result, current supply line 43 is electrically connected to one end 31 of the first strain gauge 30, and a predetermined amount of current flows through the first strain gauge 30. Then, current (electrical signal) is input to signal line 42 connected to the other end 32 of the first strain gauge 30. It should be noted that the first strain gauges 30 located in a first elongated hinge section 11 share a single signal line 42. Therefore, multiple gate lines 41 located in a first elongated hinge section 11 need to be selected sequentially.

[0050] like Figure 2 As shown, a connection portion 50, a gate line drive circuit 51, a signal line selection circuit 52, and a reference current wiring 53 are disposed in the portion of the array layer 21 located in the first outer frame region 6. The connection portion 50 is used to connect to a driver IC (Integrated Circuit) disposed outside the stretchable device 1000.

[0051] The gate line drive circuit 51 is a circuit that drives multiple gate lines 41 based on various control signals from the driver IC. The gate line drive circuit 51 selects multiple gate lines 41 and supplies gate drive signals to the selected gate lines 41. The signal line selection circuit 52 is a switching circuit that selects multiple signal lines 42. The signal line selection circuit 52 is, for example, a multiplexer. The signal line selection circuit 52 connects the selected signal line 42 to the driver IC based on a selection signal supplied from the driver IC. The reference current wiring 53 is wiring for supplying a predetermined amount of current to the current supply line 43, extending along the first outer frame region 6. The reference current wiring 53 is connected to the driver IC via the connection portion 50 and carries the predetermined amount of current.

[0052] As described above, according to the first layer device 1, when a load is applied in the first direction X, the first hinge portion 13 deforms. Consequently, the first strain gauge 30 generates strain, and its resistance value changes. Furthermore, the current value input to the signal line 42 differs depending on whether the first strain gauge 30 generates strain or not. Therefore, the driver IC detects the strain (the input load) of the first strain gauge 30 based on the change in current value.

[0053] Next, the second-layer device 101 and the third-layer device 201 will be described.

[0054] Figure 8 This is a cross-sectional view of a stretchable device, specifically along... Figure 11 The sectional view obtained by cutting along line VIII-VIII. (Example) Figure 8 As shown, the second layer device 101 includes a second stretchable substrate 120 and a second stretchable resin 108 covering the second stretchable substrate 120.

[0055] The second stretchable resin 108 has the same configuration as the first stretchable resin 8. On the other hand, the second stretchable substrate 120 differs from the first stretchable substrate 10 in that the second elongated hinge portion 111 (see reference 10) provided on the second stretchable substrate 120... Figure 9 The direction of the second layer device 101 is different from that of the first long hinge portion 11. The following description of the second layer device 101 will focus on the differences from the first layer device 1 (the second long hinge portion 111).

[0056] Figure 9This is a top view of a portion of the second stretchable substrate of Embodiment 1. The second elongated hinge portion 111 is configured to intersect the first elongated hinge portion 11 (in the first direction X) in the top view. More specifically, the second elongated hinge portion 111 extends in the second direction Y. Therefore, in the top view, the angle at which the second elongated hinge portion 111 and the first elongated hinge portion 11 intersect is 90°. Hereinafter, the direction in which the second elongated hinge portion 111 extends is sometimes referred to as the first intersecting direction.

[0057] A plurality of second main body portions 112 included in a second elongated hinge portion 111 are arranged at equal intervals in the second direction Y (the first intersecting direction). Furthermore, a plurality of second hinge portions 113 included in the second elongated hinge portion 111 extend in the second direction Y (the first intersecting direction) while meandering. That is, when the second hinge portion 113 deforms due to a load in the second direction Y, the resistance value of the second strain gauge 130 included in the second hinge portion 113 changes. Therefore, the second layer device 101 is a device capable of detecting loads in the second direction Y.

[0058] like Figure 8 As shown, the third layer device 201 includes a third stretchable substrate 220 and a third stretchable resin 208 covering the third stretchable substrate 220.

[0059] The third stretchable resin 208 has the same structure as the first stretchable resin 8. On the other hand, the difference between the third stretchable substrate 220 and the first stretchable substrate 10 lies in the fact that the third elongated hinge portion 211 (see reference 10) provided on the third stretchable substrate 220... Figure 10 The direction of the third layer device 201 is different from that of the first long hinge portion 11. The following description of the third layer device 201 will focus on the differences from the first layer device 1 (the third long hinge portion 211).

[0060] Figure 10 This is a top view obtained by observing a portion of the third stretchable substrate of Embodiment 1 from above. The third elongated hinge portion 211 is configured to extend obliquely in the top view and intersect with both the first elongated hinge portion 11 (first direction X) and the second elongated hinge portion 111. Therefore, in the top view, the angle at which the third elongated hinge portion 211 intersects with both the second and first elongated hinge portions 111 is 45°. Hereinafter, the direction in which the third elongated hinge portion 211 extends is sometimes referred to as the second intersecting direction.

[0061] The plurality of third main body portions 212 included in a third elongated hinge portion 211 are arranged at equal intervals along an oblique direction (second intersecting direction). Furthermore, the plurality of third hinge portions 213 included in the second elongated hinge portion 111 extend obliquely while meandering. That is, when a third hinge portion 213 deforms due to an oblique load, the resistance value of the third strain gauge 230 included in the third hinge portion 213 changes. Therefore, the third layer device 201 is a device capable of detecting loads along an oblique direction.

[0062] Figure 11 This is a schematic diagram showing the overlapping state of the first, second, and third elongated hinge portions in Embodiment 1, viewed from the first thickness direction. Figure 11 As shown, the first main body portion 12, the second main body portion 112, and the third main body portion 212 are arranged to overlap in the thickness direction. Therefore, when viewed from above, three hinge portions (the first hinge portion 13, the second hinge portion 113, and the third hinge portion 213) can be seen extending from one main body portion.

[0063] like Figure 8 As shown, the first layer device 1 has a first surface 1a facing the second layer device 101. The second layer device 101 has a second surface 101a facing the first layer device 1. A first adhesive layer 2 bonds the first surface 1a and the second surface 101a together. The second layer device 101 has a third surface 101b facing the third layer device 201. The third layer device 201 has a fourth surface 201a facing the second layer device 101. A second adhesive layer 3 bonds the third surface 101b and the fourth surface 201a together. The surface of the third layer device 201 facing the second thickness direction Z2 constitutes the back surface 1002.

[0064] The above describes the stretchable device 1000 according to Embodiment 1, under, for example, tensile load (refer to...). Figure 1 When F1 acts on both ends of the stretchable device 1000, the load is applied to each of the three devices because the three devices are integrated through two adhesive layers.

[0065] Here, when the load acting on the stretchable device 1000 is along the first direction X, the first hinge portion 13 of the first layer device 1 and the third hinge portion 213 of the third layer device 201 deform. On the other hand, the second hinge portion 113 of the second layer device 101 does not deform. Furthermore, when the load acting on the stretchable device 1000 is along the second direction Y, the second hinge portion 113 and the third hinge portion 213 deform, but the first hinge portion 13 does not deform. Furthermore, when the load acting on the stretchable device 1000 is along an oblique direction, the first hinge portion 13, the second hinge portion 113, and the third hinge portion 213 deform.

[0066] Based on the above, the difference between the load in the first direction X and the oblique load can be determined by the presence or absence of deformation of the second hinge portion 113. That is, if the second hinge portion 113 does not deform, it can be determined that the direction of the load applied to the stretchable device 1000 is the first direction X. Therefore, the drive IC can accurately calculate the load in the first direction X by performing calculations based on the signal sent from the first strain gauge 30 disposed on the first hinge portion 13.

[0067] Furthermore, the difference between the load in the second direction Y and the oblique load can be determined by the presence or absence of deformation of the first hinge portion 13. That is, if the first hinge portion 13 does not deform, it can be determined that the direction of the load applied to the stretchable device 1000 is the second direction Y. Therefore, the drive IC can accurately calculate the load in the second direction Y by performing calculations based on the signal sent from the second strain gauge 130 disposed on the second hinge portion 113.

[0068] Furthermore, the oblique load can be determined by the presence or absence of deformation in both the first hinge portion 13 and the second hinge portion 113. In other words, if both the first hinge portion 13 and the second hinge portion 113 deform, it can be determined that the load applied to the stretchable device 1000 is oblique. Therefore, the drive IC can accurately calculate the oblique load by performing calculations based on the signal transmitted from the third strain gauge 230 disposed on the third hinge portion 213.

[0069] Furthermore, in this embodiment, the first main body portion 12, the second main body portion 112, and the third main body portion 212 of the stretchable device 1000 are integrally formed in the thickness direction. Therefore, it is also possible to eliminate the need to detect the action acting on both ends of the stretchable device 1000 (see reference). Figure 1 Instead of detecting F1, it detects the load acting on a portion of the first detection area 5. That is, as... Figure 11 As shown, even when a load F3 is applied to the two main body parts, the first main body part 12, the second main body part 112 and the third main body part 212 will all move along the load direction, and it is possible to detect which direction the load is in.

[0070] As described above, in the stretchable device 1000 according to Embodiment 1, the devices having elongated hinge portions extending in the direction in which the load to be detected overlap each other. Therefore, the direction of the detectable load, i.e., the direction in which the load can be detected, is not limited to the first direction X and the second direction Y. Based on the above, the stretchable device 1000 according to this embodiment has a high degree of freedom in detecting the load direction.

[0071] The above describes Embodiment 1. Next, a modified example obtained by deforming a portion of the stretchable device 1000 of Embodiment 1 will be described. Hereinafter, the differences from Embodiment 1 will be explained in detail.

[0072] (Variation example)

[0073] Figure 12 This is a cross-sectional view obtained by cutting along the thickness direction of the deformed stretchable device. For example... Figure 12 As shown, the difference between the modified stretchable device 1000A and Embodiment 1 is that the bonding range of the first adhesive layer 2A and the second adhesive layer 3A is different.

[0074] The first adhesive layer 2A connects the first surface 1a and the second surface 101a, when viewed from the thickness direction, to the outer frame area 1006 (see reference). Figure 1 The second adhesive layer 3A bonds the overlapping portions of the third surface 101b and the fourth surface 201a, as well as the portions that overlap with the outer frame region 1006 when viewed in the thickness direction, and the portions that overlap with the first main body 12, the second main body 112 and the third main body 212.

[0075] Based on the above, and according to the modified example, it is also possible to detect the loads acting on both ends of the stretchable device 1000A (refer to...). Figure 1 F1), and the load acting on a portion of the first detection area 5 (refer to ...). Figure 11 (F3). It should be noted that the lower the elastic modulus of the first adhesive layer 2A and the second adhesive layer 3A, the better, but they can also be formed from resins with high elastic modulus.

[0076] The embodiments and variations have been described above, but this disclosure is not limited to the examples shown in the embodiments and variations. While the embodiments, etc., include three devices, this disclosure requires only at least two.

[0077] Furthermore, in this embodiment, the second elongated hinge portion 111 extends in the second direction Y, and its intersection direction (first intersection direction) with the first elongated hinge portion 11 is 90°, but the intersection angle can also be an angle other than 90°. That is, in this disclosure, it is sufficient that the second elongated hinge portion 111 intersects the first elongated hinge portion 11 in a top view; there is no particular limitation on the intersection angle. The third elongated hinge portion 211 has a 45° angle relative to the respective intersection direction (second intersection direction) of the first and second elongated hinge portions 111, but this disclosure is not limited to this. That is, in this disclosure, it is sufficient that the third elongated hinge portion 211 intersects each of the first and second elongated hinge portions 111 in a top view; there is no particular limitation on the intersection angle. Therefore, for example, the second elongated hinge portion 111 can be configured to extend in a direction at a 30° angle relative to the first elongated hinge portion 11, and the third elongated hinge portion 211 can extend in a direction at a 60° angle relative to the first elongated hinge portion 11. Furthermore, according to this disclosure, since a strain gauge is provided only in the elongated hinge portion in one direction, the number of gate lines and the like provided in the elongated hinge portion can be reduced, and the width of the elongated hinge portion can be set to be narrower.

[0078] Explanation of reference numerals in the attached figures

[0079] 1. Layer 1 Devices

[0080] 1a Page 1

[0081] 2.2A First Adhesive Layer

[0082] 3.3A Second Adhesive Layer

[0083] 8. First stretchable resin

[0084] 9. Remove holes

[0085] 10 First Stretchable Substrate

[0086] 11 First long hinge section

[0087] 12 Main Body Section 1

[0088] 13 First hinge section

[0089] 20 Resin substrate

[0090] 21 Array Layers

[0091] 30 First strain gauge

[0092] 101 Layer 2 Devices

[0093] 101a Page 2

[0094] 101b Page 3

[0095] 108 Second Stretchable Resin

[0096] 111 Second long hinge section

[0097] 112 Main Body Section 2

[0098] 113 Second hinge section

[0099] 120 Second Stretchable Substrate

[0100] 130 Second strain gauge

[0101] 201 Layer 3 Devices

[0102] 201a, page 4

[0103] 208 Third Stretchable Resin

[0104] 211 Third long hinge section

[0105] 212 Main Body Section 3

[0106] 213 Third hinge section

[0107] 220 Third Stretchable Substrate

[0108] 230 Third strain gauge

[0109] 1000, 1000A Stretchable Devices

[0110] 1005 Detection Area

[0111] 1006 Outer frame area.

Claims

1. A stretchable device, comprising: Layer 1 devices; A second layer device that overlaps with the first layer device in the thickness direction; and A first adhesive layer is disposed between the first layer device and the second layer device. The first-layer device includes: A first stretchable substrate with a first strain gauge; and The first stretchable resin covering the first stretchable substrate, The second-layer device includes: A second stretchable substrate with a second strain gauge; and The second stretchable resin covering the second stretchable substrate, The first stretchable substrate has a plurality of first elongated hinge portions, which extend in a first direction parallel to the planar direction in which the first layer device extends. The second stretchable substrate has a plurality of second elongated hinge portions, which extend in a first intersecting direction parallel to the planar direction and intersecting the first direction. The plurality of the first elongated hinge portions are arranged at intervals in a direction parallel to and intersecting the first direction. The plurality of the second elongated hinge portions are arranged at intervals in a direction parallel to the planar direction and intersecting the first intersecting direction. When viewed from the thickness direction, the plurality of the first elongated hinge portions and the plurality of the second elongated hinge portions intersect each other. The first elongated hinge portion has: A plurality of first main body portions that overlap with the second elongated hinge portion when viewed from the thickness direction; and A first hinge portion that connects multiple first main body portions to each other and is equipped with the first strain gauge. The second elongated hinge portion has: A second main body portion that overlaps with the first main body portion when viewed from the thickness direction; and A second hinge portion that connects multiple of the second main body portions to each other and is provided with the second strain gauge.

2. The stretchable device according to claim 1, comprising: A third layer device that overlaps with the second layer device on the opposite side of the first layer device; and A second adhesive layer is disposed between the second layer device and the third layer device. The third-layer device includes: A third stretchable substrate equipped with a third strain gauge; and The third stretchable resin covering the third stretchable substrate. The third stretchable substrate has a plurality of third elongated hinge portions, which extend in a second intersecting direction that is parallel to the planar direction and intersects the first direction and the first intersecting direction, respectively. The plurality of the third elongated hinge portions are arranged at intervals in a direction parallel to the planar direction and intersecting the second intersecting direction. When viewed from the thickness direction, the plurality of the first elongated hinge portions and the plurality of the second elongated hinge portions intersect each other. The third elongated hinge portion has: A plurality of third main body portions that overlap with the first main body portion and the second main body portion when viewed from the thickness direction; and A third hinge portion that connects multiple third main body portions to each other and is provided with the third strain gauge.

3. The stretchable device according to claim 1, The first layer device has a first surface facing the side of the second layer device. The second layer device has a second surface facing the side of the first layer device. The first adhesive layer bonds the first surface and the second surface together.

4. The stretchable device according to claim 1, When viewed from the thickness direction, the stretchable device is divided into: The detection areas configured for the first and second elongated hinge portions; and The frame-shaped outer frame region surrounding the outer side of the detection area. The first layer device has a first surface facing the side of the second layer device. The second layer device has a second surface facing the side of the first layer device. The first adhesive layer bonds together the portions of the first surface and the second surface that overlap with the outer frame region when viewed from the thickness direction, as well as the portions that overlap with the first main body and the second main body.

5. The stretchable device according to claim 2, The second-layer device has a third surface facing the side of the third-layer device. The third layer device has a fourth surface facing the side of the second layer device. The second adhesive layer bonds the third and fourth surfaces together.

6. The stretchable device according to claim 2, When viewed from the thickness direction, the stretchable device is divided into: The detection areas configured for the first, second, and third elongated hinge portions; and The frame-shaped outer frame region surrounding the outer side of the detection area. The second-layer device has a third surface facing the side of the third-layer device. The third layer device has a fourth surface facing the side of the second layer device. The second adhesive layer bonds the portions of the third and fourth surfaces that overlap with the outer frame region when viewed from the thickness direction, as well as the portions that overlap with the first main body, the second main body, and the third main body.

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