Stretchable device

Abstract

To provide a stretchable device including a hinge part where two or more wires are disposed, in which the wires are not easily disconnected.SOLUTION: A stretchable device includes a resin base material including a plurality of body parts disposed apart from each other and a plurality of hinge parts connecting the body parts to each other, and an array layer provided on the resin base material. The array layer includes a plurality of wires extending along the hinge parts and apart from each other in a width direction of the hinge parts. The hinge part includes a plurality of bent parts that are bent when viewed from a stacking direction where the resin base material and the array layer are stacked. The bent part includes at least one or more slits that are disposed between the wires when viewed from the stacking direction and divide the bent part in the width direction.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 having 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 body portions arranged in a matrix and hinge portions connecting the body portions. The hinge portions have bent portions, for example, in an arc shape, and extend between the body portions in a meandering manner.

[0003] In order to detect a load or pressure acting on the stretchable device, an electric circuit and a plurality of wirings are provided on the array layer. The wirings are arranged across the plurality of hinge parts and the plurality of body parts. This allows the wirings to extend in a planar direction parallel to the stretchable device. [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] Incidentally, when a stretchable device is stretched or contracted, the bent portion is deformed, and strain is generated in the bent portion. Moreover, the strain is generated more from the center of the width direction of the bent portion toward the outer or inner circumference side of the bent portion. Therefore, it is preferable that the wiring is arranged so as to overlap with the center of the width direction of the bent portion. However, the number of wirings arranged in the center of the width direction of the bent portion is limited to one. Therefore, when there are two or more wirings, at least one wiring is arranged other than the center of the width direction of the bent portion, so that more strain is generated and there is a possibility of disconnection.

[0006] An object of the present invention is to provide a stretchable device in which two or more wires are arranged in a hinge portion, and each wire is less likely to break. [Means for solving the problem]

[0007] A stretchable device according to one aspect of the present disclosure includes a resin substrate and an array layer provided on the resin substrate. The resin substrate includes a plurality of body parts spaced apart from one another and a plurality of hinge parts connecting the body parts. The array layer includes a plurality of wiring lines extending along the hinge parts and spaced apart from one another in the width direction of the hinge parts. The hinge parts include a plurality of bending parts that are bent when viewed from the stacking direction in which the resin substrate and the array layer overlap. The bending parts include at least one or more slits that are disposed between the plurality of wiring lines when viewed from the stacking direction and divide the bending parts in the width direction. [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 diagram showing a cross section of the stretchable device according to the first embodiment, specifically, a cross section taken along line II-II in FIG. [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 a view of the vertical hinge portion and wiring of the first embodiment as viewed from the first stacking direction. [Figure 6] FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. [Figure 7] FIG. 7 is a plan view of the vertical hinge portion of the first modified example. [Figure 8]FIG. 8 is a plan view of the vertical hinge portion and wiring of the second modification. [Figure 9] FIG. 9 is a view of a vertical hinge portion in which wiring layers are stacked in the third modification, as viewed from the first stacking direction. 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 front side. As shown in Fig. 1, the stretchable device 100 is formed in a flat plate shape. The stretchable device 100 has a front side 1 and a back side 2 (not shown in Fig. 1, see Fig. 2) that face in opposite directions. Hereinafter, the directions parallel to each of the front side 1 and the back side 2 are referred to as planar directions.

[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. In addition, a direction parallel to the surface 1 will be referred to as a planar direction.

[0013] Fig. 2 is a schematic diagram showing a cross section of the stretchable device according to the first embodiment, specifically, a cross section taken along line II-II in Fig. 3. As shown in Fig. 2, the stretchable device 100 has a first stretchable resin 60, a stretchable substrate 8, and a second stretchable resin 70, which are laminated in this order. In other words, the stretchable substrate 8 is sandwiched between a pair of stretchable resins (the first stretchable resin 60 and the second stretchable resin 70).

[0014] Hereinafter, the direction in which the first elastic resin 60, the stretchable substrate 8, and the second elastic resin 70 are stacked is referred to as the stacking direction. With regard to the stacking direction, the direction in which the second elastic resin 70 is arranged as viewed from the first elastic resin 60 is referred to as the first stacking direction Z1, and the opposite direction to the first stacking direction Z1 is referred to as the second stacking direction Z2. Also, viewing the stretchable device 100 from the first stacking direction Z1 is referred to as a planar view.

[0015] The first elastic resin 60 and the second elastic resin 70 have insulating properties, elasticity, and flexibility. An example of a resin used as the first elastic resin 60 and the second elastic resin 70 is an acrylic elastomer. The first elastic resin 60 and the second elastic resin 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.

[0016] The first elastic resin 60 and the second elastic resin 70 are formed in a plate shape and extend in a planar direction. The surface of the first elastic resin 60 in the second stacking direction Z2 constitutes the back surface 2 of the stretchable device 100. The first elastic resin 60 has a stacking surface 61 facing the first stacking direction Z1 and facing the stretchable substrate 8.

[0017] The surface of the second elastic resin 70 in the first stacking direction Z1 constitutes the surface 1 of the stretchable device 100. The second elastic resin 70 faces the second stacking direction Z2 and has an opposing surface 71 facing the stretchable substrate 8. In addition, a frame portion 72 is provided on the edge of the second elastic resin 70, protruding further than the opposing surface 71 in the second stacking direction Z2.

[0018] The frame portion 72 is formed in a ring shape in a plan view, and surrounds the outer periphery of the stretchable substrate 8. A surface 72a of the frame portion 72 in the second stacking direction Z2 is bonded to the stacking surface 61 of the first elastic resin 60. As a result, the first elastic resin 60 and the second elastic resin 70 cooperate with each other to form a housing that houses the stretchable substrate 8.

[0019] The stretchable substrate 8 is provided with a plurality of lightening holes 9 penetrating in the stacking direction. The second elastic resin 70 has a plurality of protrusions 73 that protrude from the opposing surface 71 in the second stacking direction Z2 and are disposed in the lightening holes 9.

[0020] Although the lightening hole 9 in this embodiment is filled with the second elastic resin 70 (protrusion 73), in the present disclosure it may be filled with the first elastic resin 60. Alternatively, the lightening hole 9 may be filled with both the first elastic resin 60 and the second elastic resin 70. Alternatively, the lightening hole 9 may be filled with a resin other than the first elastic resin 60 and the second elastic resin 70. In addition, nothing may be placed in the lightening hole 9, leaving it as a space.

[0021] The stretchable substrate 8 has a resin base material 10 superimposed on a layered surface 61 of a first stretchable resin 60, and an array layer 30 superimposed on the resin base material 10. The resin base material 10 is adhered to the layered surface 61 of the first stretchable resin 60. The resin base material 10 has stretchability, flexibility, and insulating properties. The resin base material 10 is manufactured from a resin material such as polyimide.

[0022] Fig. 3 is a view of a part of the resin base material according to embodiment 1 as viewed from the first stacking direction. As shown in Fig. 3, the resin base material 10 includes a plurality of body portions 11 and a plurality of hinge portions 12 extending in a planar direction while meandering.

[0023] The body portion 11 has a quadrangular (square) shape in plan view. The body portion 11 is arranged so that four corners point in the first direction X and the second direction Y. The multiple body portions 11 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 11 in plan view in the present disclosure is not limited to a quadrangular shape, and may be a circular shape or another polygonal shape.

[0024] The hinge portions 12 connect adjacent body portions 11. There are two types of hinge portions 12: vertical hinge portions 12A extending in the first direction X, and horizontal hinge portions 12B extending in the second direction Y. Note that portions of the resin base material 10 where the body portions 11 and hinge portions 12 are not provided are lightening holes 9 penetrating the stretchable substrate 8 in the thickness direction.

[0025] 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.

[0026] In such an electric circuit, functional elements such as transistors are stacked on the body portion 11. Wiring for supplying signals and power to the functional elements is disposed across the body portions 11 and the hinge portions 12 and extends in the planar direction (see the wirings 31, 32, and 33 in FIG. 3). The array layer 30 of this embodiment is provided with three wirings 31, 32, and 33 extending in the first direction X1.

[0027] According to the above structure, in the stretchable device 100, the portion adjacent to the lightening hole 9 (the hinge portion 12) has low rigidity. Therefore, when a load in a planar direction acts on the stretchable device 100, the hinge portion 12 deforms. On the other hand, the deformation of the body portion 11 is small, and damage to the functional element stacked on the body portion 11 is suppressed.

[0028] Next, the hinge portion of the stretchable substrate 8 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 11 sandwiching the vertical hinge portion 12A will be referred to as the first body portion 11a and the other as the second body portion 11b. The hinge portion 12 will be described in detail. Furthermore, when the horizontal hinge portion 12B is rotated by 90°, it will have the same shape as the vertical hinge portion 12A. Therefore, the vertical hinge portion 12A will be described as a representative example, and the explanation of the horizontal hinge portion 12B will be omitted.

[0029] As shown in FIG. 4, the vertical hinge portion 12A has a bent portion 20. The vertical hinge portion 12A of this embodiment has four bent portions 20. Therefore, the vertical hinge portion 12A extends in the first direction X while meandering in the second direction Y. In addition, each bent portion 20 of this embodiment is formed in an arc shape in a plan view. The length T1 in the width direction of the vertical hinge portion 12A is constant from one end to the other end of the vertical hinge portion 12A. Note that the bent portion of the present disclosure may be formed in an angular shape instead of an arc shape. In addition, the number of bent portions is not limited to four.

[0030] The four bent portions 20 are a first bent portion 21, a second bent portion 22, a third bent portion 23, and a fourth bent portion 24, which are arranged in this order from the first body portion 11a toward the second body portion 11b. The first bent portion 21 and the fourth bent portion 24 are quadrant-shaped and bent at 90 degrees. The second bent portion 22 and the third bent portion 23 are approximately semicircular and bent at 180 degrees.

[0031] In addition, a linear connection portion 25 is provided between the second bent portion 22 and the third bent portion 23. A linear first base portion 26 is provided between the first body portion 11a and the first bent portion 21. A linear first base portion 26 is provided between the second body portion 11b and the fourth bent portion 24. Hereinafter, the connection portion 25, the first base portion 26, and the second base portion 27 may be collectively referred to as a linear portion.

[0032] The vertical hinge portion 12A is provided with two slits 28 extending along the direction in which the vertical hinge portion 12A extends. The slits 28 are not illustrated in the hinge portion 12 in FIG. 3. In the present embodiment, the slits 28 of the hinge portion 12 are formed by etching, but the method of forming the slits 28 of the hinge portion 12 is not particularly important in the present disclosure. Hereinafter, the slits 28 of the hinge portion 12 will be simply referred to as slits 28.

[0033] The slit 28 extends from one end to the other end of the vertical hinge portion 12A. That is, the entire vertical hinge portion 12A is divided into three in the width direction. The width T2 of the slit 28 is constant from one end to the other end of the slit 28. As described above, the first bent portion 21, the second bent portion 22, the third bent portion 23, the fourth bent portion 24, the connection portion 25, the first base portion 26, and the second base portion 27 are each divided into three in the width direction. Hereinafter, the three parts obtained by dividing the vertical hinge portion 12A are referred to as split hinge portions 41, 42, and 43. Also, one of the three parts obtained by dividing the bent portion 20 is referred to as a split bent portion. Also, the split hinge portions 41, 42, and 43 have the same length T3 in the width direction.

[0034] 5 is a view of the vertical hinge portion and wiring of the first embodiment as viewed from the first stacking direction. As shown in FIG. 5, the wirings 31, 32, and 33 of the array layer 30 are arranged spaced apart from each other in the width direction of the vertical hinge portion 12A. Furthermore, the wiring 31 is arranged in the split hinge portion 41. The wiring 32 is arranged in the split hinge portion 42. The wiring 33 is arranged in the split hinge portion 43. Thus, the wirings 31, 32, and 33 are arranged separately in each of the split hinge portions 41, 42, and 43. Furthermore, in a plan view, the slits 28 are arranged between the wirings 31 and 32 and between the wirings 32 and 33.

[0035] Fig. 6 is a cross-sectional view taken along line VI-VI in Fig. 5. As shown in Fig. 6, the widthwise center portion O31 of the wiring 31 overlaps in the stacking direction with the widthwise center portion O41 of the split hinge portion 41. Similarly, the widthwise center portion O32 of the wiring 32 overlaps in the stacking direction with the widthwise center portion O42 of the split hinge portion 42. The center portions O32 and O42 overlap in the stacking direction with the widthwise center portion O12 of the vertical hinge portion 12A. The widthwise center portion O33 of the wiring 33 overlaps in the stacking direction with the widthwise center portion O43 of the split hinge portion 43. In addition, a second elastic resin 70 is disposed in the slit 28.

[0036] Next, the strain generated in the wirings 31, 32, and 33 when a load acts on the vertical hinge portion 12A will be described. In this description, the load acting on the vertical hinge portion 12A is a tensile load. When a tensile load acts on the vertical hinge portion 12A, the first bent portion 21, the second bent portion 22, the third bent portion 23, and the fourth bent portion 24 are deformed so that their curvatures become smaller. That is, the first bent portion 21, the second bent portion 22, the third bent portion 23, and the fourth bent portion 24 are subjected to similar strain. In the following description, the second bent portion 22 will be described as a representative example, and the description of the other bent portions 20 will be omitted. In addition, the three parts of the second bent portion 22 will be referred to as the second outer peripheral divided bent portion 22a, the second intermediate divided bent portion 22b, and the second inner peripheral divided bent portion 22c (see also FIG. 4 and FIG. 5).

[0037] First, a case where the slit 28 is not provided will be described. If the slit 28 is not provided, the strain generated in the second bent portion 22 increases as it moves away from the center of the width direction of the second bent portion 22 (the center portion O12 of the vertical hinge portion 12A) toward the inner periphery or the outer periphery. Also, if the wiring 31 is disposed near the center portion O12 of the vertical hinge portion 12A, the generated strain decreases. As shown in FIG. 6, the wiring 31 is located on the outer periphery side from the center portion O12 of the vertical hinge portion 12A, and is separated by a distance L1. The wiring 33 is located on the inner periphery side from the center portion O12 of the vertical hinge portion 12A, and is separated by a distance L2. Therefore, if the slit 28 is not provided, the strain generated in the wiring 31 and 33 is large, and the strain generated in the wiring 32 is small.

[0038] On the other hand, in this embodiment, the strain generated in the second outer periphery divided bending portion 22a increases the further away from the widthwise center of the second outer periphery divided bending portion 22a (widthwise center O41 of the split hinge portion 41) to the inner periphery or outer periphery. The strain generated in the second intermediate divided bending portion 22b increases the further away from the widthwise center of the second intermediate divided bending portion 22b (widthwise center O42 of the split hinge portion 42). The strain generated in the second inner periphery divided bending portion 22c increases the further away from the widthwise center of the second inner periphery divided bending portion 22c (widthwise center O43 of the split hinge portion 43) to the inner periphery or outer periphery.

[0039] The widthwise center part O31 of the wiring 31 overlaps with the widthwise center part of the second outer peripheral divided bending part 22a (widthwise center part O41 of the divided hinge part 41) in the stacking direction. The widthwise center part O32 of the wiring 32 overlaps with the widthwise center part of the second intermediate divided bending part 22b (widthwise center part O42 of the divided hinge part 42) in the stacking direction. The widthwise center part O33 of the wiring 33 overlaps with the widthwise center part of the second inner peripheral divided bending part 22c (widthwise center part O43 of the divided hinge part 43) in the stacking direction. Therefore, the strain generated in the wirings 31 and 33 is less than when the slit 28 is not provided. Moreover, the strain generated in the wiring 32 is as small as when the slit 28 is not provided.

[0040] As described above, according to this embodiment, the wires 31, 33 arranged in a portion other than the central portion O12 in the width direction of the hinge portion 12 are less distorted, and the wires 31, 33 are less likely to break. In addition, when a load is applied to the vertical hinge portion 12A, the connection portion 25, the first base portion 26, and the second base portion 27 are less distorted. Therefore, the wires 31, 32, 33 are less likely to break at their straight portions (the connection portion 25, the first base portion 26, and the second base portion 27).

[0041] Although the first embodiment has been described above, the present disclosure is not limited thereto. For example, in the present embodiment, there are three wirings and two slits 28, but the present disclosure may have two wirings and one slit 28. Or, the present disclosure may have four wirings and three slits 28. Thus, the number of wirings and slits is not particularly limited in the present disclosure.

[0042] In addition, in this embodiment, the widthwise central portions O31, O32, O33 of the wirings 31, 32, 33 overlap in the stacking direction with the widthwise central portions O41, O42, O43 of the split hinge portions 41, 42, 43, but in the present disclosure, they may be arranged shifted in the width direction.

[0043] Fig. 7 is a plan view of the vertical hinge portion of Modification 1. As shown in Fig. 7, in the present disclosure, the elastic resin (second elastic resin 70) does not have to be disposed in the slit 28. In other words, the slit 28 may be a space.

[0044] In addition, in the first embodiment, the slit 28 extends from one end to the other end of the hinge portion, but the slit 28 of the present disclosure may be provided only in the bending portion 20. FIG. 8 is a plan view of the vertical hinge portion and wiring of the second modification. That is, as in the second modification shown in FIG. 8, the connection portion 25, the first base portion 26, and the second base portion 27 may not be provided with the slit 28. That is, the straight portions (the connection portion 25, the first base portion 26, and the second base portion 27) of the second modification are continuous in the width direction. In the first modification shown in FIG. 7, since the elastic resin (the second elastic resin 70) is not provided in the slit 28, there is a possibility that the divided bending portions (the second outer peripheral divided bending portion 22a, the second intermediate divided bending portion 22b, and the second inner peripheral divided bending portion 22c) may interfere with each other. However, according to the second modification, the interference between the divided bending portions can be suppressed.

[0045] In addition, in the present disclosure, the width of the wiring and the width of the slit do not have to be constant in the direction in which the hinge portion extends. Below, a third modification in which the width of the wiring and the width of the slit are not constant will be described.

[0046] 9 is a view of the vertical hinge portion in which wiring layers are stacked in the third modification, viewed from the first stacking direction. As shown in FIG. 9, in the third modification, only the second bent portion 22, the connection portion 25, and the third bent portion 23 of the hinge portion 12 are extracted and described. The second bent portion 22 of the hinge portion 12 in the third modification has a second outer periphery divided bent portion 22a, a second intermediate divided bent portion 22b, and a second inner periphery divided bent portion 22c. The connection portion 25 has a first connection portion 25a, a second connection portion 25b, and a third connection portion 25c. The third bent portion 23 has a third inner periphery divided bent portion 23a, a third intermediate divided bent portion 23b, and a third outer periphery divided bent portion 23c.

[0047] The wiring 31 has an arc wiring portion 31a provided in the second outer periphery divided bend portion 22a, a partial wiring portion 31b provided in the first connection portion 25a, and an arc wiring portion 31c provided in the third inner periphery divided bend portion 23a. The wiring 32 has an arc wiring portion 32a overlapped with the second intermediate divided bend portion 22b, a partial wiring portion 32b overlapped with the second connection portion 25b, and an arc wiring portion 32c overlapped with the third intermediate divided bend portion 23b. The wiring 33 has an arc wiring portion 33a overlapped with the second inner periphery divided bend portion 22c, a partial wiring portion 33b overlapped with the third connection portion 25c, and an arc wiring portion 33c overlapped with the third outer periphery divided bend portion 23c.

[0048] The radii of curvature R1, R2, R3 of the arc wiring portions 31a, 32a, 33a are 340, 320, 300, and the radii of curvature are larger toward the outer periphery. The widths T11, T12, T13 of the arc wiring portions 31a, 32a, 33a are 10.6, 10.0, 9.4, and the widths are larger toward the outer periphery.

[0049] The electrical resistance value of the wiring is calculated by electrical resistivity × length of wiring ÷ cross-sectional area of ​​the wiring. Here, the arc wiring parts 31a, 32a, and 33a are formed of the same material and have the same electrical resistivity. The arc wiring parts 31a, 32a, and 33a are approximately semicircular (180°) with the virtual point O22 as the center. Therefore, the lengths of the arc wiring parts 31a, 32a, and 33a are πR1, πR2, and πR3, and the radii of curvature are different from each other. The cross-sectional areas of the arc wiring parts 31a, 32a, and 33a are the same in thickness in the stacking direction, but different in width from each other.

[0050] Therefore, the relative relationship of the resistance values ​​of the arc wiring portions 31a, 32a, and 33a is R1 / T11:R2 / T12:R3 / T13. In other words, the relative relationship of the resistance values ​​of the arc wiring portions 31a, 32a, and 33a can be obtained by dividing the radius of curvature of the arc wiring portions 31a, 32a, and 33a by the width of the arc wiring portions 31a, 32a, and 33a.

[0051] In this embodiment, the value of the radius of curvature divided by the width of each of the arc wiring portions 31a, 32a, and 33a is "32". In other words, the relative relationship of the resistance values ​​of the arc wiring portions 31a, 32a, and 33a is 32:32:32. From the above, in this embodiment, the resistance values ​​of the arc wiring portions 31a, 32a, and 33a are the same. Therefore, when the second bend portion 22 is not deformed, the electrical characteristics of each of the arc wiring portions 31a, 32a, and 33a are common to each other.

[0052] The partial wiring 31b has a smaller width as it approaches the arc wiring portion 31c, and the width T14 of the arc wiring portion 31c is 9.4. The width T15 of the partial wiring 32b and the arc wiring portion 32c is 10.0, which is the same as the width T12 of the arc wiring portion 32a. The partial wiring 31b has a smaller width as it approaches the arc wiring portion 33c, and the width T14 of the arc wiring portion 33c is 10.6. In other words, the wirings 31, 32, and 33 are point-symmetric with respect to the point O25. Therefore, the relative relationship of the resistance values ​​of the arc wiring portions 31c, 32c, and 33c is also 32:32:32. From the above, the resistance values ​​of the arc wiring portions 31c, 32c, and 33c are the same. Therefore, when the third bend portion 23 is not deformed, the electrical characteristics of the arc wiring portions 31a, 32a, and 33a are common to each other.

[0053] From the above, the wirings 31, 32, and 33 can have common electrical characteristics in the range where they overlap with the second bent portion 22, the connection portion 25, and the third bent portion .

[0054] In addition, the widths of the second outer circumference divided bending portion 22a, the second intermediate divided bending portion 22b, and the second inner circumference divided bending portion 22c are T21, T22, and T23, respectively. The radii of curvature of the second outer circumference divided bending portion 22a, the second intermediate divided bending portion 22b, and the second inner circumference divided bending portion 22c are R1, R2, and R3, respectively, which are the same as those of the arc wiring portions 31a, 32a, and 33a. The values ​​obtained by dividing the radii of curvature by the widths are the same ((R1 / T21)=(R2 / T22)=(R3 / T23)). Therefore, the expansion / contraction rates of the second outer circumference divided bending portion 22a, the second intermediate divided bending portion 22b, and the second inner circumference divided bending portion 22c are the same.

[0055] Similarly, the values ​​obtained by dividing the radii of curvature R4, R5, and R6 by the widths T24, T25, and T26 of the third inner circumference divided bending portion 23a, the third intermediate divided bending portion 23b, and the third outer circumference divided bending portion 23c are the same ((R4 / T24)=(R5 / T25)=(R6 / T26)). Therefore, the third inner circumference divided bending portion 23a, the third intermediate divided bending portion 23b, and the third outer circumference divided bending portion 23c have the same expansion / contraction ratio. [Explanation of symbols]

[0056] 8 Stretchable Board 9 Holes 10 Resin substrate 11 Body 12 Hinge part 12A Vertical hinge part 12B Horizontal hinge part 20 Bend 21 1st bending part 22 Second bending part 22a 2nd outer circumference divided bending part (divided bending part) 22b 2nd intermediate split bending part (split bending part) 22c Second inner circumference divided bend (divided bend) 23 3rd bending part 23a Third inner circumference divided bend section (divided bend section) 23b 3rd intermediate split bending part (split bending part) 23c 3rd outer circumference divided bending part (divided bending part) 24 4th bending part 25 Connection 26 1st base 27 Second base 28 Slit 30 Array Layer 31, 32, 33 Wiring 31a, 31c, 32a, 32c, 33a, 33c Arc wiring section 41, 42, 43 Split hinge section 60 1st elastic resin 70 Second elastic resin 100 Stretchable Devices

Claims

1. A resin base material having a plurality of body portions arranged apart from each other and a plurality of hinge portions connecting the body portions to each other; An array layer provided on the resin substrate; having the array layer has a plurality of wirings extending along the hinge portion and spaced apart from each other in a width direction of the hinge portion; the hinge portion has a plurality of bending portions that are bent when viewed from a lamination direction in which the resin substrate and the array layer overlap each other, The bent portion is provided with at least one slit that is disposed between the plurality of wirings when viewed from the stacking direction and divides the bent portion in a width direction. Stretchable device.

2. The bent portion has a plurality of divided bent portions separated in the width direction by the slits, The plurality of wirings are each disposed at a center portion in the width direction of the divided bent portion. The stretchable device of claim 1.

3. The slit extends from one end to the other end of the hinge portion. The stretchable device of claim 1.

4. The hinge portion has a straight portion that is straight when viewed from the stacking direction, The straight portion is not provided with the slit and is continuous in the width direction. The stretchable device of claim 1.

5. The bent portion has a plurality of divided bent portions separated in the width direction by the slits, The bent portion is an arc-shaped bent portion when viewed from the stacking direction, The plurality of divided bending portions are each a plurality of divided bending portions having a different radius of curvature, the plurality of wirings are arranged in the divided bent portion, and each of the wirings has an arc wiring portion having a different radius of curvature; The plurality of arc wiring portions have the same value obtained by dividing the radius of curvature of the arc wiring portion by the width of the arc wiring portion. A stretchable device according to any one of claims 1 to 4.

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