Stretchable device

Abstract

To provide a stretchable device including a narrowed frame region.SOLUTION: A stretchable device includes a stretchable substrate extending in a plane direction, and a pair of flexible resin layers having the stretchable substrate held from both sides in a stacking direction orthogonal to the plane direction. When the surface is viewed in the stacking direction, the surface is sectioned into a central region existing in a central part of the surface and a frame region existing in an edge part of the surface and surrounding the central region. The stretchable substrate includes a resin base material and an array layer disposed in the stacking direction. The resin base material includes a hinge part extending while meandering in the plane direction. The hinge part includes a plurality of arc parts formed in an arc shape when viewed in the stacking direction. The art part includes a central region arc part disposed in the central region, and a frame region arc part disposed in the frame region. A curvature radius of the frame region arc part is smaller than that of the central region arc part.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a stretchable device. [Background technology]

[0002] The stretchable device has a stretchable substrate with excellent elasticity and flexibility. As shown in Patent Document 1, the stretchable substrate includes a resin substrate and an array layer provided on the resin substrate. The resin substrate has a hinge portion. This hinge portion has a so-called meandering shape and extends in a planar direction while meandering. An electric circuit is provided on the array layer. There are various types of electric circuits, such as a strain detection circuit that detects the stretch load in the planar direction of the stretchable device, a pressure detection circuit input to the surface of the stretchable device, and a light detection circuit that detects light incident on the stretchable device.

[0003] In the above electric circuit, the detection element that detects the load, etc. is generally disposed in the center of the stretchable device (hereinafter referred to as the central region). In other words, the central region is the detection region that detects the load, etc. Meanwhile, wiring and the like that supplies signals and power to the detection element are disposed on the edge of the stretchable device that surrounds the center of the stretchable device. Note that, since the edge of the stretchable device is frame-shaped, it will be referred to as the frame region hereinafter. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2020-202208 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, since the hinge part is serpentine, the size in the direction perpendicular to the line connecting one end of the hinge part to the other end (hereinafter, sometimes referred to as the width direction) is large. In other words, the area in the width direction that the hinge part occupies is large, and the frame area of ​​the stretchable device is expanded.

[0006] An object of the present invention is to provide a stretchable device that can reduce the frame area. [Means for solving the problem]

[0007] A stretchable device according to an embodiment of the present disclosure includes a stretchable substrate extending in a planar direction including a first direction and a second direction intersecting the first direction, and a pair of elastic resin layers sandwiching the stretchable substrate from both sides of a stacking direction intersecting the planar direction. One of the pair of elastic resin layers has a surface facing the opposite direction to the stretchable substrate. When the surface is viewed from the stacking direction, the surface is divided into a central region located in the center of the surface and a frame region located at the edge of the surface and surrounding the central region. The stretchable substrate has a resin base material and an array layer arranged in the stacking direction. The resin base material has a hinge portion extending in a meandering manner in the planar direction. The hinge portion has a plurality of arc portions formed in an arc shape when viewed from the stacking direction. The arc portions have a central region arc portion arranged in the central region and a frame region arc portion arranged in the frame region. The radius of curvature of the frame region arc portion is smaller than the radius of curvature of the central region arc portion. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view of a stretchable device according to a first embodiment, as viewed from the front side. [Diagram 2] FIG. 2 is a schematic cross-sectional view of the stretchable device according to the first embodiment. [Diagram 3]FIG. 3 is a view of a part of the resin substrate according to embodiment 1 as viewed from the first lamination direction. [Figure 4] FIG. 4 is a view of the vertical hinge portion of the first embodiment as viewed from the first stacking direction. [Diagram 5] FIG. 5 is an enlarged view of the vicinity of the boundary line between the central region and the frame region in the resin substrate of the first embodiment. [Figure 6] FIG. 6 is an enlarged view of the area enclosed by the frame line VI in FIG. [Figure 7] FIG. 7 is a view of the resin base material arranged in the frame region of the first modification example, viewed from the first lamination direction. [Figure 8] FIG. 8 is a view of the resin base material arranged in the frame region of the second modification, viewed from the first lamination direction. [Figure 9] FIG. 9 is an enlarged view of the vicinity of the boundary line between the central region and the frame region in the resin base material of the third modification. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] The form (embodiment) for carrying out the present disclosure will be described in detail with reference to the drawings. The invention of the present disclosure is not limited to the contents described in the following embodiment. In addition, the components described below include those that a person skilled in the art can easily imagine and those that are substantially the same. Furthermore, the components described below can be appropriately combined. Note that the disclosure is merely an example, and those that a person skilled in the art can easily imagine appropriate modifications while maintaining the gist of the invention are naturally included in the scope of the present invention. In order to make the explanation clearer, the drawings may be schematic in terms of the width, thickness, shape, etc. of each part compared to the actual embodiment, but are merely an example and do not limit the interpretation of the present invention. In addition, in this specification and each figure, the same reference numerals are given to components similar to those described above with respect to the previous figures, and detailed explanations may be omitted as appropriate.

[0010] Furthermore, in this specification and the claims, when expressing an aspect of arranging another structure on top of a certain structure, the term "on top" is used, unless otherwise specified, to include both the case where another structure is arranged directly on top of a certain structure so as to be in contact with the certain structure, and the case where another structure is arranged above a certain structure via yet another structure.

[0011] (Embodiment 1) Fig. 1 is a perspective view of the stretchable device according to the first embodiment, viewed from the side opposite to the front surface. As shown in Fig. 1, the stretchable device 100 is formed in a flat plate shape. The stretchable device 100 has a front surface 1 and a back surface 2 (the back surface 2 is not shown in Fig. 1; see Fig. 2) that face in opposite directions. Hereinafter, the directions parallel to each of the front surface 1 and the back surface 2 are referred to as planar directions. Also, the direction intersecting with the planar direction is referred to as stacking direction.

[0012] The stretchable device 100 is formed into a rectangle (quadrilateral) when viewed from a direction opposite to the surface 1. Thus, the surface 1 has a pair of long sides 3 and a pair of short sides 4. Hereinafter, a direction parallel to the planar direction and parallel to the long sides 3 will be referred to as a first direction X, and a direction parallel to the short sides 4 will be referred to as a second direction Y.

[0013] When viewed from the direction opposite to the surface 1, the stretchable device 100 is divided into a central region 5 and a frame region 6. The central region 5 is located in the center of the surface 1 of the stretchable device 100, and has a rectangular (quadrilateral) shape when viewed from the direction opposite to the surface 1. The frame region 6 is located at the edge of the surface 1 of the stretchable device 100, and has a frame shape (quadrilateral frame shape). Note that the imaginary line M shown in FIG. 1 indicates the boundary between the central region 5 and the frame region 6.

[0014] Fig. 2 is a schematic diagram showing a cross section of the stretchable device according to embodiment 1. As shown in Fig. 2, the stretchable device 100 has a first stretchable resin layer 60, a stretchable substrate 10, and a second stretchable resin layer 70, which are laminated in this order in the lamination direction. In other words, the stretchable substrate 10 is sandwiched between a pair of stretchable resin layers (the first stretchable resin layer 60 and the second stretchable resin layer 70).

[0015] Hereinafter, regarding the stacking direction, the direction in which the second elastic resin layer 70 is arranged as viewed from the first elastic resin layer 60 is referred to as a first stacking direction Z1, and the opposite direction to the first stacking direction Z1 is referred to as a second stacking direction Z2. Also, viewing the stretchable device 100 from the first stacking direction Z1 is referred to as a plan view.

[0016] The first elastic resin layer 60 and the second elastic resin layer 70 have insulating properties, elasticity, and flexibility. An example of a resin used as the first elastic resin layer 60 and the second elastic resin layer 70 is an acrylic elastomer. The first elastic resin layer 60 and the second elastic resin layer 70 of the present disclosure are not limited to acrylic elastomers, and may be acrylic resins, epoxy resins, urethane resins, or the like, and are not particularly limited.

[0017] The first stretchable resin layer 60 and the second stretchable resin layer 70 are formed in a plate shape and extend in a planar direction. The surface of the first stretchable resin layer 60 in the second stacking direction Z2 constitutes the back surface 2 of the stretchable device 100. The first stretchable resin layer 60 has a stacking surface 61 facing the first stacking direction Z1 and facing the stretchable substrate 10.

[0018] The surface of the second stretchable resin layer 70 in the first stacking direction Z1 faces the opposite direction to the stretchable substrate 10, and constitutes the surface 1 of the stretchable device 100. The second stretchable resin layer 70 faces the second stacking direction Z2 and has an opposing surface 71 facing the stretchable substrate 10. In addition, a frame portion 72 is provided on the edge of the second stretchable resin layer 70, protruding further than the opposing surface 71 in the second stacking direction Z2.

[0019] The frame portion 72 is formed in a ring shape in a plan view, and surrounds the outer periphery of the stretchable substrate 10. A surface 72a of the frame portion 72 in the second stacking direction Z2 is bonded to the stacking surface 61 of the first stretchable resin layer 60. As a result, the first stretchable resin layer 60 and the second stretchable resin layer 70 cooperate with each other to form a housing that houses the stretchable substrate 10.

[0020] A plurality of lightening holes 19 penetrating in the stacking direction are formed in the stretchable substrate 10. The second elastic resin layer 70 has a plurality of protrusions 73 that protrude from the opposing surface 71 in the second stacking direction Z2 and fill the lightening holes 19.

[0021] Although the lightening hole 19 in this embodiment is filled with the second stretchable resin layer 70 (protrusion 73), in the present disclosure, it may be filled with the first stretchable resin layer 60. Alternatively, the lightening hole 19 may be filled with both the first stretchable resin layer 60 and the second stretchable resin layer 70. Alternatively, the lightening hole 19 may be filled with a resin other than the first stretchable resin layer 60 and the second stretchable resin layer 70. In addition, nothing may be placed in the lightening hole 19, leaving it as a space.

[0022] The stretchable substrate 10 has a resin base material 11 superimposed on a lamination surface 61 of a first elastic resin layer 60, and an array layer 30 superimposed on the resin base material 11. The resin base material 11 is adhered to the lamination surface 61 of the first elastic resin layer 60. The resin base material 11 has elasticity, flexibility, and insulating properties. The resin base material 11 is manufactured from a resin material such as polyimide.

[0023] Fig. 3 is a view of a part of the resin base material of embodiment 1 arranged in a central region, viewed from the first lamination direction. As shown in Fig. 3, the resin base material 11 includes a plurality of hinge portions 12 extending in a planar direction while meandering, and a plurality of body portions 13.

[0024] There are two types of hinge portion 12: vertical hinge portion 12A extending in the first direction X, and horizontal hinge portion 12B extending in the second direction Y. When horizontal hinge portion 12B is rotated 90°, it has the same shape as vertical hinge portion 12A. Therefore, in the detailed description of hinge portion 12 described below, vertical hinge portion 12A will be described as a representative example, and the description of horizontal hinge portion 12B will be omitted. Furthermore, body portion 13 is disposed at the junction of vertical hinge portion 12A and horizontal hinge portion 12B, and is connected to both vertical hinge portion 12A and horizontal hinge portion 12B.

[0025] Moreover, the body portion 13 has a quadrangular (square) shape in plan view. The body portion 13 is arranged so that four corners point in the first direction X and the second direction Y. The multiple body portions 13 are arranged in the first direction X and the second direction Y and are spaced apart from each other. Note that the shape of the body portion 13 in the plan view of the present disclosure is not limited to a quadrangular shape, and may be a circular shape or another polygonal shape.

[0026] Further, in the resin base material 11, a portion where the body portion 13 and the hinge portion 12 are not provided is a lightening hole 19 penetrating the stretchable substrate 10 in the thickness direction.

[0027] Although not particularly shown, the array layer 30 includes a plurality of insulating layers stacked in a stacking direction and an electric circuit provided in the plurality of insulating layers. Examples of the electric circuit include a strain detection circuit that detects the stretch load in the planar direction of the stretchable device 100, a pressure detection circuit input to the surface of the stretchable device 100, and a light detection circuit input to the stretchable device 100, but the type of the electric circuit is not particularly limited in the present disclosure.

[0028] In such an electric circuit, a functional element such as a transistor is stacked on the body portion 13. Wiring for supplying signals and power to the functional element is arranged across the multiple hinge portions 12 and the multiple body portions 13, and extends in the planar direction.

[0029] According to the above structure, the stretchable device 100 has low rigidity in the portion (hinge portion 12) adjacent to the lightening hole 19. Therefore, when a load in a planar direction acts on the stretchable device 100, the hinge portion 12 deforms. On the other hand, the amount of deformation of the body portion 13 is extremely small, and damage to the functional elements stacked on the body portion 13 is suppressed.

[0030] Next, the hinge portion 12 of the stretchable substrate 10 will be described in detail. Fig. 4 is a view of the vertical hinge portion of the first embodiment as viewed from the first stacking direction. For convenience of explanation, one of the two body portions 13 provided on both ends of the vertical hinge portion 12A will be referred to as a first body portion 13a and the other as a second body portion 13b.

[0031] The vertical hinge portion 12A has an arc-shaped arc portion 20. The arc portion 20 has a first arc portion 21 that protrudes in one direction in the second direction Y, and a second arc portion 22 that protrudes in the other direction in the second direction Y. As a result, the vertical hinge portion 12A meanders in the second direction Y.

[0032] In addition, a linear first base portion 23 is provided between the first arc portion 21 and the first body portion 13a. A linear second base portion 24 is provided between the second arc portion 22 and the second body portion 13b. The connection portion between the first arc portion 21 and the first base portion 23 is a first bent portion 25 bent in an arc shape. The connection portion between the second arc portion 22 and the second base portion 24 is a second bent portion 26 bent in an arc shape. The first bent portion 25 and the second bent portion 26 form a quadrant shape.

[0033] The above is the basic configuration of the hinge portion 12 (vertical hinge portion 12A). FIG. 5 is an enlarged view of the vicinity of the boundary line between the central region and the frame region of the resin base material of the first embodiment. As shown in FIG. 5, the resin base material 11 is included in both the central region 5 and the frame region 6 in a plan view. Thus, the hinge portion 12 has a central region hinge portion 512 arranged in the central region 5 and a frame region hinge portion 612 arranged in the frame region 6. In addition, the body portion 13 has a central region body portion 513 arranged in the central region 5 and a frame region body portion 613 arranged in the frame region 6. Hereinafter, the central region hinge portion 512 and the frame region hinge portion 612 will be described in detail.

[0034] 4, the central region hinge portion 512 has a central region first base portion 523 (first base portion 23), a central region first bent portion 525 (first bent portion 25), a central region first arc portion 521 (first arc portion 21), a central region second arc portion 522 (second arc portion 22), a central region second bent portion 526 (second bent portion 26), and a central region second base portion 524 (second base portion 24), which are arranged in this order from the first body portion 13a toward the second body portion 13b. Hereinafter, the central region first arc portion 521 and the central region second arc portion 522 will be collectively referred to as a central region arc portion 520.

[0035] The width L1 of the central region hinge portion 512 is constant from one end to the other end of the central region hinge portion 512. Therefore, the width of the central region arc portion 520 is also L1. The radius of curvature of the central region arc portion 520 is R1. The size in the width direction (second direction Y in FIG. 4) occupied by the central region first arc portion 521 and the central region second arc portion 522 is W1. In other words, the size in the width direction occupied by the central region hinge portion 512 is W1.

[0036] 5, some of the multiple central region hinge portions 512 are disposed in the frame region 6 beyond the imaginary line M. In this manner, in the present disclosure, in the vicinity of the imaginary line M, some of the central region hinge portions 512 may be disposed in the frame region 6, and some of the frame region hinge portions 612 may be disposed in the central region 5.

[0037] Fig. 6 is an enlarged view of the area surrounded by the frame line VI in Fig. 5. As shown in Fig. 6, the hinge portion 612 for the frame region has a first base portion 623 for the frame region (first base portion 23), a first bent portion 625 for the frame region (first bent portion 25), a first arc portion 621 for the frame region (first arc portion 21), a second arc portion 622 for the frame region (second arc portion 22), a second bent portion 626 for the frame region (second bent portion 26), and a second base portion 624 for the frame region (second base portion 24), which are arranged in this order. Hereinafter, the first arc portion 621 for the frame region and the second arc portion 622 for the frame region will be collectively referred to as an arc portion 620 for the frame region.

[0038] The width L2 of the hinge portion for frame area 612 is constant from one end to the other end of the hinge portion for frame area 612. Therefore, the width of the arc portion for frame area 620 is also L2.

[0039] The frame region arc portion 620 has a radius of curvature R2. The frame region arc portion 620 has a radius of curvature R2 smaller than the central region arc portion 520 having a radius of curvature R1 (see FIG. 4). Therefore, the widthwise size W2 (see FIG. 6) occupied by the frame region first arc portion 621 and the frame region second arc portion 622 is smaller than the widthwise size W1 (see FIG. 4) occupied by the central region first arc portion 521 and the central region second arc portion 522. That is, the frame region hinge portion 612 occupies a smaller area in the widthwise direction than the central region hinge portion 512. This makes it possible to narrow the frame region 6 without reducing the number of frame region hinge portions 612 arranged in the widthwise direction of the frame region hinge portions 612.

[0040] Regarding the arc portion 20, if the radius of curvature (R1, R2) is large, the length of the arc portion 20 is large, and the arc portion 20 is easily deformed. On the other hand, if the width (L1, L2) of the arc portion 20 is large, the rigidity of the arc portion 20 is high, and the arc portion 20 is not easily deformed. In this embodiment, the value (R2 / L2) obtained by dividing the radius of curvature R2 by the width L2 is the same as the value (R1 / L1) obtained by dividing the radius of curvature R1 by the width L1. In other words, the frame region arc portion 620 and the central region arc portion 520 are similar in shape (the reduction ratio in the first direction X is the same as the reduction ratio in the second direction Y). Therefore, the frame region arc portion 620 and the central region arc portion 520 have the same elasticity (ease of deformation).

[0041] In this embodiment, not only the arc portion 20 (the arc portion for frame region 620 and the arc portion for central region 520), but also the overall shape of the hinge portion for frame region 612 and the overall shape of the hinge portion for central region 512 are similar (the reduction ratio in the first direction X is the same as the reduction ratio in the second direction Y). Therefore, the hinge portion for frame region 612 and the arc portion for central region 520 also have the same elasticity. In addition, the body portion for frame region 613 and the body portion for central region 513 are similar (the reduction ratio in the first direction X is the same as the reduction ratio in the second direction Y). The reduction ratio between the body portion for frame region 613 and the body portion for central region 513 is the same as the reduction ratio between the hinge portion for frame region 612 and the hinge portion for central region 512.

[0042] Although the first embodiment has been described above, the present embodiment is not limited to the example described in the first embodiment. For example, in the embodiment, the value (R2 / L2) obtained by dividing the radius of curvature R2 by the width L2 is the same (similar) as the value (R1 / L1) obtained by dividing the radius of curvature R1 by the width L1, but in the present disclosure, they may not be the same. That is, in the present disclosure, the frame region arc portion 620 and the central region arc portion 520 may not be similar in shape. This is because even in such a hinge portion 12, the frame region 6 can be narrowed as long as the radius of curvature R2 of the frame region arc portion 620 is smaller than the radius of curvature R1 of the central region arc portion 520. Therefore, in the present disclosure, the frame region hinge portion 612 and the central region hinge portion 512 may not be similar in shape. In addition, the frame region body portion 613 and the central region body portion 513 may not be similar in shape. In addition, even if the body part 613 for the frame area and the body part 513 for the central area have a similar shape, the reduction ratio between the body part 613 for the frame area and the body part 513 for the central area does not have to be the same as the reduction ratio between the hinge part 612 for the frame area and the hinge part 512 for the central area.

[0043] Furthermore, in the present disclosure, the frame region body part 613 does not have to be disposed between the frame region hinge parts 612. Below, a first modification in which the frame region body part 613 is not disposed will be described. In addition, the description of each modification will focus on the differences from the first embodiment.

[0044] Fig. 7 is a view of the resin base material 11 arranged in the frame region 6 of Modification 1 as viewed from the first lamination direction. As shown in Fig. 7, the resin base material 11 of Modification 1 differs from the first embodiment in that only a plurality of frame region hinge portions 612 are arranged in the frame region 6. Thus, the frame region hinge portions 612 are connected to the ends of adjacent frame region hinge portions 612. Furthermore, the plurality of frame region hinge portions 612 are joined together to form a long hinge portion 712.

[0045] Although not shown, the long hinge portion 712 extends in the circumferential direction outside the central region 5. One end of the long hinge portion 712 extends into the central region 5 and is connected to the central region body portion 513 arranged in the central region 5. This connects the wiring arranged in the long hinge portion 712 to the element arranged in the central region 5. The long hinge portions 712 do not cross each other (are not connected). The long hinge portion 712 on the outer periphery side extends to the central region 5 around the outside of the long hinge portion 712 on the inner periphery side. Therefore, of the multiple long hinge portions 712, the long hinge portion 712 arranged on the outer periphery side has a longer extension length.

[0046] Moreover, the wirings 51, 52, and 53 of the array layer 30 are laminated on the long hinge portion 712 of the first modification. The wirings 51, 52, and 53 extend along the long hinge portion 712. Therefore, the wirings 51, 52, and 53 extend in the circumferential direction outside the central region 5, similar to the long hinge portion 712.

[0047] The wirings 51, 52, and 53 are arranged in this order from the central region 5 outward. In other words, the wiring 52 (peripheral wiring) is arranged on the outer periphery side of the wiring 51 (inner periphery wiring) and has a longer extension length than the wiring 51. Similarly, the wiring 53 (peripheral wiring) is arranged on the outer periphery side of the wiring 52 (inner periphery wiring) and has a longer extension length than the wiring 52.

[0048] In such a layout relationship, the width of the wiring 52 (peripheral wiring) is larger than the width of the wiring 51 (inner wiring). Also, the width of the wiring 53 (peripheral wiring) is larger than the width of the wiring 52 (inner wiring). Here, the resistance value of the wiring is calculated by dividing the length of the wiring by the cross-sectional area (width) of the wiring. If the widths of the wirings 51, 52, and 53 are the same, the resistance values ​​of the wirings 53, 52, and 51 increase in the order of length. On the other hand, in the first modification, the cross-sectional area (width) increases as the length of the wiring increases, and the resistance values ​​of the wirings 51, 52, and 53 are the same. Therefore, for example, the same amount of current can be supplied to the elements connected to the wirings 51, 52, and 53, respectively, and the detection accuracy can be improved.

[0049] In the above, Modification 1 has been described, in which one wiring is arranged for one hinge portion 12 (long hinge portion 712), but the present disclosure is not limited to this. Below, Modification 2 in which multiple wirings are arranged for one hinge portion 12 (long hinge portion 712) will be described.

[0050] 8 is a view of the resin base material 11 arranged in the frame region 6 of Modification 2, viewed from the first stacking direction. Three wirings 54, 55, and 56 are arranged for one long hinge portion 712 (frame region hinge portion 612). According to Modification 2, the number of long hinge portions 712 can be reduced, and the frame region 6 can be made even narrower.

[0051] Further, the long hinge portion 712 is provided with two slits 728 extending along the direction in which the long hinge portion 712 extends. Thus, the long hinge portion 712 has split hinge portions 712A, 712B, and 712C that are split into three in the width direction. Note that in this embodiment, the slits 728 of the long hinge portion 712 are formed by etching, but in the present disclosure, the method of forming the slits 728 is not particularly limited.

[0052] The two slits 728 are disposed between the wires 54 and 55 and between the wires 55 and 56. Therefore, the three wires 54, 55, and 56 are disposed in the split hinge portions 712A, 712B, and 712C, respectively.

[0053] Before describing the effect of Modification 2, a case where slit 728 is not provided in long hinge portion 712 will be described. If slit 728 is not provided, for example, when a tensile load acts on long hinge portion 712, distortion occurs in frame region arc portion 620. Furthermore, the distortion increases as the distance from the center in the width direction of frame region arc portion 620 to the inner periphery or outer periphery side increases. Therefore, little distortion occurs in wiring 55 arranged in the center in the width direction of frame region arc portion 620, and much distortion occurs in wirings 54, 56.

[0054] On the other hand, according to the second modification, the distortion occurring in the frame region arc portion 620 increases the farther it is from the center in the width direction of each of the split hinge portions 712A, 712B, and 712C toward the inner or outer periphery. Therefore, the wirings 54 and 56 are less distorted than when the slits 728 are not provided. This reduces the possibility of the wirings 54 and 56 breaking.

[0055] Although the second modification has been described above, in the present disclosure, a plurality of wirings may be provided in the long hinge portion 712 that is not provided with the slit 728. Next, a third modification will be described.

[0056] 9 is an enlarged view of the vicinity of the boundary line between the central region 5 and the frame region 6 in the resin base material 11 of the modified example 3. The resin base material 11 of the modified example 3 differs from the embodiment 1 in that it has a dummy portion 80. The dummy portion 80 is not connected to the other hinge portions 12 or the body portion 13. In other words, the dummy portion 80 is not provided with wiring of the array layer 30. In addition, in a plan view, the dummy portion 80 overlaps with the imaginary line M. Note that the imaginary line M of the modified example 3 extends between the central region first base portion 523 extending from the central region body portion 513 and the frame region hinge portion 612.

[0057] Next, the effect of the third modification will be described. For example, when a tensile load in the second direction Y acts on the stretchable device 100, stress may be concentrated at the boundary (where it overlaps with the imaginary line M) between the first central region base portion 523 and the hinge portion for frame region 612, which have different rigidities. However, according to the third modification, the dummy portion 80 is disposed at the boundary between the first central region base portion 523 and the hinge portion for frame region 612. This increases the rigidity of the boundary, and it is possible to prevent stress from being concentrated at the boundary between the first central region base portion 523 and the hinge portion for frame region 612.

[0058] Although the third modification has been described above, in the present disclosure, there is no particular restriction on the shape of the dummy portion 80. For example, as shown in Fig. 9, the dummy portion 80 may be a dummy portion 81 having a rectangular shape in a plan view or a dummy portion 82 having a circular shape. Alternatively, the dummy portion 83 may be a combination of a hinge portion 612 for the frame region and a body portion 613 for the frame region. [Explanation of symbols]

[0059] 5 Central area 6 Frame Area 10 Stretchable Board 11 Resin substrate 12 Hinge part 12A Vertical hinge part 12B Horizontal hinge part 13 Body 19 Hole 20 Arc section 21 First arc 22 Second arc section 23 1st base 24 Second base 25 1st bending part 26 2nd bending part 30 Array Layer 51, 52, 53, 54, 55, 56 Wiring 60 1st stretchable resin layer 70 Second elastic resin layer 80, 81, 82, 83 Dummy part 100 Stretchable Devices 512 Hinge part for central area 513 Body part for central area 520 Central area arc section 521 First circular arc for central area 522 Second circular arc for central area 612 Hinge part for frame area 613 Body part for frame area 620 Circular arc for frame area 621 First circular arc for frame area 622 Second arc section for frame area 712 Long hinge part 712A, 712B, 712C split hinge section 728 Slit

Claims

1. A stretchable substrate extending in a planar direction including a first direction and a second direction intersecting the first direction; A pair of elastic resin layers sandwiching the stretchable substrate from both sides in a lamination direction intersecting the planar direction; Equipped with One of the pair of elastic resin layers has a surface facing in an opposite direction to the stretchable substrate, When the surface is viewed from the stacking direction, a central region located at a central portion of the surface; a frame region located at an edge of the surface and surrounding the central region; It is divided into The stretchable substrate has a resin base material and an array layer arranged in the stacking direction, the resin base material has a hinge portion that extends in a meandering manner in the planar direction, The hinge portion has a plurality of arc portions formed in an arc shape when viewed from the stacking direction, The arc portion is a central region arc portion disposed in the central region; A frame area circular arc portion disposed in the frame area; having The radius of curvature of the frame region arc portion is smaller than the radius of curvature of the central region arc portion. Stretchable device.

2. The frame region arc portion and the central region arc portion have similar shapes. The stretchable device of claim 1.

3. The hinge portion is a central region hinge portion disposed in the central region and having the central region arc portion; a frame region hinge portion disposed in the frame region and having the frame region arc portion; having The hinge portion for the frame region and the hinge portion for the central region have similar shapes.

3. The stretchable device of claim 2.

4. the resin base material has a plurality of body portions to which ends of the plurality of hinge portions are connected, The body portion is a central region body portion disposed in the central region and connected to the central region hinge portion; a frame region body portion disposed in the frame region and connected to the frame region hinge portion; having the frame region body portion and the center region body portion have similar shapes, A reduction ratio between the hinge portion for the frame region and the hinge portion for the central region is equal to a reduction ratio between the body portion for the frame region and the body portion for the central region. The stretchable device of claim 3.

5. the array layer has a plurality of wirings disposed in the frame region and extending circumferentially outside the central region; The plurality of wirings include Inner wiring, an outer periphery wiring disposed outside the inner periphery wiring; having The width of the outer periphery wiring is greater than the width of the inner periphery wiring. A stretchable device according to any one of claims 1 to 4.

6. the hinge portion is disposed in the frame region and includes a frame region hinge portion having the frame region arc portion, A plurality of wirings are provided on one of the frame region hinge parts, the wirings extending along the frame region hinge part, The frame region hinge portion is provided with a slit that is disposed between the plurality of wirings when viewed from the stacking direction and divides the frame region hinge portion in a width direction. A stretchable device according to any one of claims 1 to 4.

7. the resin base material has a dummy portion on which no wiring is provided, When viewed from the stacking direction, the dummy portion overlaps with a virtual line indicating a boundary between the central region and the frame region. A stretchable device according to any one of claims 1 to 4.

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