Stretchable Device

Abstract

This expansion device comprises: a first base material having a first major surface and a second major surface opposing each other, the first base material extending in a first direction and being expandable; a first wire provided on the first major surface, extending along the first major surface, and being expandable; a second base material having a third major surface and a fourth major surface opposing each other; a second wire provided on the third major surface and extending along the third major surface; and a connection member connecting the first base material and the second base material. When viewed from a direction orthogonal to the first major surface, the first base material includes a connection region overlapping the second base material, and a non-connection region not overlapping the second base material. When viewed from the direction orthogonal to the first major surface, the connection member overlaps the connection region. In the non-connection region, the first base material has a first hole portion provided in at least one of the first major surface and the second major surface.

Description

[Technical field]

[0001] The present disclosure relates to stretchable devices. [Background technology]

[0002] Conventionally, there is a stretchable device described in JP 2013-145842 A (Patent Document 1). This stretchable device has a stretchable circuit body in which a stretchable wiring part is provided on a stretchable insulating base material, a non-stretchable component mounting board laminated in a predetermined area of ​​the stretchable circuit body, and an electrical connection part that electrically connects the wiring part of the component mounting board and the wiring part of the stretchable circuit body. The component mounting board is provided with an expansion / contraction prevention guard that prevents expansion / contraction of the area including the electrical connection part of the stretchable circuit body. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2013-145842 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, it has been found that in the conventional stretchable device, when the stretchable circuit body is stretched and used, the wiring part of the stretchable circuit body near the stretch prevention guard may break. In other words, since a part of the wiring part is prevented from stretching by the stretch prevention guard, when the stretchable circuit body is stretched, a tensile force is generated between the stretchable part and the non-stretchable part of the wiring part, which pulls them in opposite directions, and this may become the starting point for breaking the wiring part. In this way, there is a risk that the wiring part may break when the stretchable device is stretched.

[0005] Therefore, an object of the present disclosure is to provide a stretchable device that can suppress disconnection of wiring due to stretching of the stretchable device. [Means for solving the problem]

[0006] In order to solve the above problems, a stretchable device according to one aspect of the present disclosure includes: A first base material having a first main surface and a second main surface opposed to each other and extending in a first direction and being stretchable; A stretchable first wiring provided on the first main surface and extending along the first main surface; a second substrate having a third main surface and a fourth main surface opposed to each other; a second wiring provided on the third main surface and extending along the third main surface; a connection member that connects the first base material and the second base material; Equipped with the first base material includes a connection region that overlaps with the second base material and a non-connection region that does not overlap with the second base material when viewed in a direction perpendicular to the first main surface, the connection member overlaps the connection region when viewed in a direction perpendicular to the first main surface, The first base material has a first hole provided in at least one of the first main surface and the second main surface in the non-connected region.

[0007] Here, "on the main surface" does not mean an absolute direction such as vertically upward as determined by the direction of gravity, but rather means the direction toward the outside of the substrate between the outside and inside of the substrate bounded by the main surface. Therefore, "on the main surface" is a relative direction determined by the orientation of the main surface. Furthermore, "above" an element includes not only a position directly above the element (on) but also a position above the element, i.e., a position above the element through another object or a position above the element with a gap (above).

[0008] In addition, extending in the first direction does not mean extending in a branched manner into multiple paths, but means extending along a single path, and includes not only extending in a straight line, but also extending in a curved, meandering, or spiral shape. The first direction is not limited to the longitudinal direction of the first base material, but refers to the expansion and contraction direction of the first base material.

[0009] The hole may have a bottom that does not penetrate the first substrate (first and second main surfaces), or may penetrate the first substrate (first and second main surfaces). The hole is not limited to a circular, elliptical, or polygonal shape when viewed from a direction perpendicular to the first substrate, but may also include a slit shape. The hole is not limited to a closed hole whose inner surface is continuous around the circumference when viewed from a direction perpendicular to the first substrate, but may include, for example, an open hole that is cut out from the periphery of the first substrate and whose inner surface opens to the periphery.

[0010] According to the above aspect, since the first substrate has the first hole in the non-connection region, when the first substrate is stretched in the first direction, the vicinity of the first hole of the first substrate is easily stretched, and the stretching of the vicinity of the connection region of the first substrate can be reduced. This makes it possible to suppress disconnection of the first wiring in the vicinity of the non-connection region and suppress disconnection of the first wiring due to the stretching of the first substrate of the stretchable device.

[0011] Preferably, in one embodiment of the stretchable device, A first base material having a first main surface and a second main surface opposed to each other and extending in a first direction and being stretchable; A stretchable first wiring provided on the first main surface and extending along the first main surface; a second substrate having a third main surface and a fourth main surface opposed to each other; a second wiring provided on the third main surface and extending along the third main surface; Equipped with the first base material includes a connection region that overlaps with the second base material and a non-connection region that does not overlap with the second base material when viewed in a direction perpendicular to the first main surface, the first substrate and the second substrate are connected in the connection region; The first base material has a first hole provided in at least one of the first main surface and the second main surface in the non-connected region.

[0012] According to the embodiment, since the first substrate has the first hole in the non-connection region, when the first substrate is stretched in the first direction, the vicinity of the first hole of the first substrate is easily stretched, and the stretching of the vicinity of the connection region of the first substrate can be reduced. This makes it possible to suppress disconnection of the first wiring in the vicinity of the non-connection region and suppress disconnection of the first wiring due to the stretching of the first substrate of the stretchable device.

[0013] Preferably, in one embodiment of the stretchable device, the first hole passes through the first substrate.

[0014] According to the embodiment, the first substrate is more likely to stretch near the first hole portion, and stretching near the connection region of the first substrate is further reduced, thereby making it possible to further suppress breakage of the first wiring due to stretching of the first substrate.

[0015] Preferably, in one embodiment of the stretchable device, the shortest distance in the first direction between the first hole portion and the connection region is greater than the maximum diameter of the first hole portion in the first direction.

[0016] According to the embodiment, the first hole portion can be separated from the connection region, and elongation of the first substrate near the connection region can be further reduced, thereby further suppressing breakage of the first wiring due to elongation of the first substrate.

[0017] Preferably, in one embodiment of the stretchable device, a part of the first substrate is present between the first wiring and the first hole in a second direction perpendicular to the first direction.

[0018] According to the embodiment, the first hole is separated from the first wiring, and the first wiring is prevented from being exposed through the first hole, which reduces the risk of the first hole being misaligned and coming into contact with the first wiring, and also reduces damage to the first wiring from the outside via the first hole.

[0019] Preferably, in one embodiment of the stretchable device, Further, a second hole portion is disposed in the first direction relative to the first hole portion, the first hole is closer to the connection region than the second hole; In the first direction, the shortest distance between the connection region and the first hole is greater than the shortest distance between the first hole and the second hole.

[0020] According to the embodiment, the elongation of the first substrate near the first hole and the second hole is increased, and the elongation of the first substrate near the connection region is reduced, thereby further suppressing breakage of the first wiring due to elongation of the first substrate.

[0021] In addition, the first hole portion can be separated from the connection region, which can further reduce the elongation of the first substrate near the connection region, and the first hole portion and the second hole portion can be brought closer to each other, which can further increase the elongation of the first substrate near the first and second holes and further reduce the elongation of the first substrate near the connection region.

[0022] Preferably, in one embodiment of the stretchable device, a third hole portion disposed in the first direction relative to the first hole portion and the second hole portion, the second hole portion is closer to the connection region than the third hole portion; In the first direction, the shortest distance between the first hole and the second hole is greater than the shortest distance between the second hole and the third hole.

[0023] According to the embodiment, the second hole portion can be separated from the connection region, and the elongation of the first substrate near the connection region can be further reduced. Also, the second hole portion and the third hole portion can be brought closer to each other, and the elongation of the first substrate near the connection region can be further increased and the elongation of the first substrate near the connection region can be further reduced.

[0024] Preferably, in one embodiment of the stretchable device, Further comprising a fourth hole; The first wiring is disposed between the first hole and the fourth hole.

[0025] According to the embodiment, the elongation of the first substrate near the first hole and the fourth hole is increased, and the elongation of the first substrate near the connection region is reduced, thereby further suppressing breakage of the first wiring due to elongation of the first substrate.

[0026] Preferably, in one embodiment of the stretchable device, a fifth hole portion disposed in the first direction relative to the fourth hole portion, In the first direction, the fourth hole portion is closer to the connection region than the fifth hole portion.

[0027] According to the embodiment, the elongation of the first substrate near the fourth hole and the fifth hole is increased, and the elongation of the first substrate near the connection region is reduced, thereby further suppressing breakage of the first wiring due to elongation of the first substrate.

[0028] Preferably, Further, a second hole portion is disposed in the first direction relative to the first hole portion, In the first direction, the first hole portion is closer to the connection region than the second hole portion; In the first direction, a shortest distance between the first hole portion and the connection region is different from a shortest distance between the fourth hole portion and the connection region, In the first direction, the shortest distance between the second hole and the connection region is different from the shortest distance between the fifth hole and the connection region.

[0029] According to the embodiment, the load on the first wiring caused by the expansion of the vicinity of the hole of the first base material can be further reduced.

[0030] Preferably, the second hole portions arranged in the first direction relative to the first hole portions and the fifth hole portions arranged in the first direction relative to the fourth hole portions are arranged in a staggered pattern.

[0031] Here, "the second hole portion and the fifth hole portion are arranged in a staggered pattern" means that in a second direction perpendicular to the first direction, the centers of the second hole portions and the centers of the fifth hole portions do not overlap, and it is preferable that the entirety of the second hole portions and the entirety of the fifth hole portions do not overlap.

[0032] According to the embodiment, the load on the first wiring caused by the expansion of the vicinity of the hole of the first base material can be further reduced.

[0033] Preferably, in one embodiment of the stretchable device, Further, a second hole portion is disposed in the first direction relative to the first hole portion, In the first direction, the first hole portion is closer to the connection region than the second hole portion; In the first direction, the shortest distance between the first hole portion and the connection region is equal to the shortest distance between the fourth hole portion and the connection region, In the first direction, the shortest distance between the second hole and the connection region is different from the shortest distance between the fifth hole and the connection region.

[0034] According to the embodiment, the load on the first wiring caused by the expansion of the vicinity of the hole of the first base material can be further reduced.

[0035] Preferably, the second hole portions arranged in the first direction relative to the first hole portions and the fifth hole portions arranged in the first direction relative to the fourth hole portions are arranged in a staggered pattern.

[0036] Here, "the second hole portion and the fifth hole portion are arranged in a staggered pattern" means that in a second direction perpendicular to the first direction, the centers of the second hole portions and the centers of the fifth hole portions do not overlap, and it is preferable that the entirety of the second hole portions and the entirety of the fifth hole portions do not overlap.

[0037] According to the embodiment, the load on the first wiring caused by the expansion of the vicinity of the hole of the first base material can be further reduced.

[0038] Preferably, in one embodiment of the stretchable device, the stretchable device further includes a protective film covering at least a portion of the first main surface of the first base material and at least a portion of the first wiring.

[0039] According to the embodiment, since the protective film covers at least a part of the first wiring, insulation from disturbance factors can be ensured, and discomfort to the user can be suppressed when used in a living body. Furthermore, since the protective film covers at least a part of the first main surface of the first substrate, discomfort to the user can be suppressed when used in a living body. Note that this embodiment can also be used for things other than living bodies. Furthermore, a material that is biocompatible may be used as the protective film, in which case discomfort to the user can be suppressed. Note that the protective film does not have to be biocompatible.

[0040] Preferably, in one embodiment of the stretchable device, the protective film has a through hole overlapping the hole portion when viewed in a direction perpendicular to the first main surface.

[0041] According to the embodiment, even if a protective film is provided, it is possible to increase the elongation in the vicinity of the hole portion of the first substrate and to reduce the elongation in the vicinity of the connection region of the first substrate.

[0042] Preferably, in one embodiment of the stretchable device, the protective film has an overlapping portion that overlaps with the hole portion when viewed in a direction perpendicular to the first main surface, The overlapping portion is located outside the hole.

[0043] According to the embodiment, an internal space of the hole can be secured, the elongation of the first substrate near the hole can be increased, and the elongation of the first substrate near the connection region can be reduced. Effect of the Invention

[0044] According to the stretchable device of one aspect of the present disclosure, disconnection of wiring caused by stretching of the stretchable device can be suppressed. [Brief description of the drawings]

[0045] [Figure 1]FIG. 1 is a plan view showing a first embodiment of a stretchable device. [Diagram 2] FIG. 2 is a cross-sectional view taken along line II-II of FIG. [Diagram 3] FIG. 11 is a plan view showing a second embodiment of the stretchable device. [Figure 4] FIG. 11 is a plan view showing a third embodiment of the stretchable device. [Diagram 5] FIG. 13 is a plan view showing a fourth embodiment of the stretchable device. [Figure 6] FIG. 13 is a plan view showing a fifth embodiment of the stretchable device. [Figure 7] FIG. 13 is a plan view showing a sixth embodiment of the stretchable device. [Figure 8] FIG. 8 is a cross-sectional view taken along line VIII-VIII of FIG. 7. [Figure 9] 11A and 11B are cross-sectional views showing other forms of the protective film. [Figure 10] FIG. 1 is a plan view illustrating a first embodiment of a stretchable device. [Figure 11] 11 is a graph showing the relationship between the shortest distance from a connection region to a hole and the unit displacement amount of a first base material in the vicinity of the connection region. [Figure 12] FIG. 11 is a plan view illustrating a stretchable device according to a second embodiment of the present invention. [Figure 13] 11 is a graph showing the relationship between the number of holes and the amount of unit displacement of the first base material in the vicinity of the connection region. [Figure 14] FIG. 13 is a plan view illustrating a third embodiment of a stretchable device. [Figure 15] 11 is a graph showing the relationship between the shortest distance from a connection region to a hole and the unit displacement amount of a first base material in the vicinity of the connection region. [Figure 16] FIG. 13 is a plan view illustrating a stretchable device according to a fourth embodiment of the present invention. [Figure 17] 13 is a graph showing the relationship between the shortest distance from the connection area to the second row of holes and the unit displacement amount of the first base material in the vicinity of the connection area. [Figure 18] FIG. 13 is a plan view illustrating a stretchable device according to a fifth embodiment of the present invention. [Figure 19]13 is a graph showing the relationship between the number of rows of holes and the amount of unit displacement of the first base material in the vicinity of the connection region. [Figure 20] 13 is a graph illustrating a sixth embodiment of a stretchable device and showing an amount of stretch of the stretchable device when a wire is disconnected near a connection region. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0046] Hereinafter, a stretchable device according to one aspect of the present disclosure will be described in detail with reference to the illustrated embodiments. Note that the drawings include some schematic views and may not reflect actual dimensions or ratios.

[0047] (First embodiment) Fig. 1 is a plan view showing a first embodiment of a stretchable device, and Fig. 2 is a cross-sectional view taken along line II-II in Fig. 1. The stretchable device is attached to a living body and used to measure a biosignal.

[0048] As shown in FIGS. 1 and 2, the stretchable device 1 includes a stretchable first substrate 11, a stretchable first wiring 21 provided on the first substrate 11, a second substrate 12, a second wiring 22 provided on the second substrate 12, and a connection member 40 that connects the first substrate 11 and the second substrate 12 and connects the first wiring 21 and the second wiring 22.

[0049] The first base material 11 has a first main surface 111 and a second main surface 112 facing each other. The first base material 11 extends in a first direction A. The first base material 11 is formed in a rectangular shape having long sides along the first direction A. The width of the first base material 11 is constant along the first direction A. The width refers to the length in a second direction B perpendicular to the first direction A.

[0050] The first base material 11 is formed of a resin material having elasticity, such as a styrene resin, an olefin resin, an epoxy resin, a urethane resin, an acrylic resin, or a silicone resin, and is preferably formed of a urethane resin. An example of the urethane resin is thermoplastic polyurethane (TPU). An example of the styrene resin is styrene-butadiene-styrene copolymer resin (SBS).

[0051] The expansion rate of the first base material 11 is preferably 50% or more. This expansion rate allows the stretchable device to have good conformability to the living body. The Young's modulus of the first base material 11 is preferably 100 MPa or less, and more preferably 30 MPa or less. This Young's modulus can reduce discomfort for the user. The thickness of the first base material 11 is, for example, 0.1 μm or more and 100 μm or less. The width of the first base material 11 is, for example, 10 mm or more and 100 mm or less.

[0052] The first wiring 21 is provided on the first main surface 111 and extends along the first main surface 111. The first wiring 21 extends along a first direction A. There are a plurality of first wirings 21, and the plurality of first wirings 21 are arranged side by side in a second direction B. In the first embodiment, there are two first wirings 21.

[0053] The first wiring 21 is made of a conductive material having elasticity. The conductive material is, for example, a mixture of metal powder such as silver, copper, or nickel and an elastomeric resin such as silicone. The average particle size D50 of the metal powder is preferably 0.01 μm or more and 10 μm or less. The shape of the metal powder may be spherical, flat, or irregularly shaped with protrusions, etc.

[0054] The thickness of the first wiring 21 is preferably 100 μm or less, more preferably 50 μm or less, and preferably 1 μm or more, more preferably 10 μm or more. The thinner the thickness of the first wiring 21, the smaller the unevenness and the easier lamination. The width of the first wiring 21 is preferably 0.1 mm or more and 4 mm or less.

[0055] The first wiring 21 is formed by screen printing, inkjet printing, dispensing, or etching of a metal foil so as to be in direct contact with the first main surface 111. The first wiring 21 may be disposed on the first main surface 111 via an insulating film (not shown) having insulating properties. The first wiring 21 may be covered with an insulating film.

[0056] The second base material 12 has a third main surface 121 and a fourth main surface 122 facing each other. The second base material 12 extends in a first direction A. The second base material 12 is formed in a rectangular shape having long sides along the first direction A. The width of the second base material 12 is constant along the first direction A. The width refers to the length in the second direction B.

[0057] The second substrate 12 is formed of a resin material, for example, a styrene resin, an olefin resin, an epoxy resin, a urethane resin, an acrylic resin, or a silicone resin. The second substrate 12 may be, for example, a flexible printed circuit board (FPC) or a printed circuit board (PCB). The second substrate 12 may be stretchable. If the second substrate 12 is stretchable, the stretching load applied to the second substrate 12 can be reduced.

[0058] The second substrate 12 preferably has an expansion rate of 50% or more. This expansion rate allows the stretchable device to better conform to the living body. The second substrate 12 preferably has a Young's modulus of 100 MPa or less, and more preferably 30 MPa or less. This Young's modulus can reduce discomfort for the user. The second substrate 12 has a thickness of, for example, 0.1 μm or more and 100 μm or less. The second substrate 12 has a width of, for example, 10 mm or more and 100 mm or less.

[0059] The second wiring 22 is provided on the third main surface 121 and extends along the third main surface 121. The second wiring 22 extends along the first direction A. There are a plurality of second wirings 22, and the plurality of second wirings 22 are arranged side by side in the second direction B. In the first embodiment, there are two second wirings 22.

[0060] The second wiring 22 is formed of a conductive material. For example, a metal foil such as silver, copper, or nickel may be used as the conductive material, or a mixture of a metal powder such as silver, copper, or nickel and an elastomer resin such as an epoxy resin, a urethane resin, an acrylic resin, or a silicone resin may be used. The thickness of the metal foil is preferably 0.01 μm or more and 10 μm or less, and the average particle size D50 of the metal powder is preferably 0.01 μm or more and 10 μm or less. The shape of the metal powder may be spherical, flat, or irregularly shaped with protrusions. The second wiring 22 may be stretchable.

[0061] The thickness of the second wiring 22 is preferably 100 μm or less, more preferably 50 μm or less, and preferably 1 μm or more, more preferably 10 μm or more. The thinner the thickness of the second wiring 22, the smaller the unevenness and the easier lamination, etc. The width of the second wiring 22 is preferably 0.1 mm or more and 4 mm or less.

[0062] The second wiring 22 is formed by screen printing, inkjet printing, dispensing, or etching of a metal foil so as to be in direct contact with the third main surface 121. The second wiring 22 may be disposed on the third main surface 121 via an insulating film having insulating properties (not shown), or the second wiring 22 may be covered with an insulating film.

[0063] The first substrate 11 and the second substrate 12 are disposed so that their ends in the first direction A overlap each other. Specifically, the first substrate 11 and the second substrate 12 are disposed so that the first main surface 111 and the third main surface 121 face each other. The first wiring 21 and the second wiring 22 are disposed so that they face each other.

[0064] The connection member 40 is disposed between the first substrate 11 and the second substrate 12 in the overlapping portion of the first substrate 11 and the second substrate 12, and connects the first substrate 11 and the second substrate 12. The connection member 40 is disposed between the first wiring 21 and the second wiring 22 in the overlapping portion of the first substrate 11 and the second substrate 12, and connects the first wiring 21 and the second wiring 22. The connection member 40 has adhesiveness and conductivity. Since the connection member 40 has conductivity, the first wiring 21 and the second wiring 22 are electrically connected via the connection member 40. The method of connecting the first substrate 11 and the second substrate 12 is not limited to the method described above. For example, the first substrate 11 and the second substrate 12 may be arranged so that the first main surface 111 and the third main surface 121 face in the same direction, and the first substrate 11 and the second substrate 12 may be connected by a connecting member 40.

[0065] The connection member 40 is, for example, an anisotropic conductive film (ACF), and is conductive in a direction perpendicular to the first main surface 111 and insulating in a planar direction parallel to the first main surface 111. The connection member 40 contains a thermosetting epoxy resin and conductive particles dispersed in the epoxy resin. Therefore, the first wiring 21 is conductive only to the second wiring 22 directly above it, and is not conductive to the first wiring 21 adjacent to it in the direction of the first main surface 111 or the second wiring 22 not directly above it.

[0066] The thickness of the connection member 40 is, for example, preferably 1 μm to 100 μm, more preferably 5 μm to 50 μm. The width of the connection member 40 may be sufficient if it can cover the first wiring 21 and the second wiring 22 to be connected, but is preferably set to, for example, the larger of the width of the first base material 11 and the width of the second base material 12.

[0067] The first substrate 11 includes a connection region Z1 that overlaps with the second substrate 12 and a non-connection region Z2 that does not overlap with the second substrate 12 when viewed from a direction perpendicular to the first main surface 111. The connection member 40 overlaps the connection region Z1 when viewed from a direction perpendicular to the first main surface 111. The first substrate 11 and the second substrate 12 are connected in the connection region Z1. The first substrate 11 has a hole 50 provided in the first main surface 111 in the non-connection region Z2. The hole 50 corresponds to an example of a "first hole" as defined in the claims. The hole 50 penetrates the first main surface 111 and the second main surface 112. The hole 50 is formed in a circular shape when viewed from a direction perpendicular to the first main surface 111. The diameter of the hole 50 is, for example, 0.4 mm. The hole 50 is located in the center of the first substrate 11 in the width direction, and is located between the two first wirings 21.

[0068] According to the above configuration, since the first substrate 11 has the hole 50 in the non-connection region Z2, when the first substrate 11 is stretched in the first direction A, the vicinity of the hole 50 of the first substrate 11 is easily stretched, and the stretching of the vicinity of the connection region Z1 of the first substrate 11 can be reduced. The vicinity of the connection region Z1 of the first substrate 11 refers to a range within 300 μm from the connection region Z1. In other words, the stretching of the first substrate 11 in the first direction A can be absorbed in the vicinity of the hole 50 of the first substrate 11. In other words, the Young's modulus of the non-connection region Z2 is smaller than that of the connection region Z1. This suppresses the breakage of the first wiring 21 in the vicinity of the non-connection region Z2, and suppresses the breakage of the first wiring 21 due to the stretching of the first substrate 11 of the stretchable device 1. Note that hole 50 may be provided in first main surface 111 and have a bottom that does not penetrate to second main surface 112, and the above-mentioned effect is still achieved in this case. Alternatively, hole 50 may be provided in second main surface 112 and have a bottom that does not penetrate to first main surface 111, and the above-mentioned effect is still achieved in this case. By having hole 50 penetrate first base material 11 as in this embodiment, a more significant effect is achieved.

[0069] The second substrate 12 and the second wiring 22 may be stretchable. In this case, the second substrate 12 may include a connection region overlapping the connection member 40 and a non-connection region not overlapping the connection member 40, similar to the first substrate 11, and the second substrate 12 may have a hole 50 in at least one of the third main surface 121 and the fourth main surface 122 in the non-connection region, as shown by the two-dot chain line in FIG. 1. This can suppress disconnection of the second wiring 22 in the vicinity of the non-connection region, and suppress disconnection of the second wiring 22 due to the extension of the second substrate 12 of the stretchable device 1. Preferably, the hole 50 penetrates the second substrate 12 to have a more significant effect.

[0070] The shape of the hole 50 may be an ellipse or a polygon, or may be a slit shape. In this case, the hole 50 is preferably elongated in the first direction A, so that the elongation of the vicinity of the hole 50 can be increased.

[0071] The connection member 40 may be present between the first substrate 11 and the second substrate 12, without being present between the first wiring 21 and the second wiring 22. Also, the connection member 40 may not be provided, and the first substrate 11 and the second substrate 12 may be directly connected by welding or the like. In this case as well, the connection region Z1 of the first substrate 11 is a region that overlaps with and is connected to the second substrate 12 when viewed from a direction perpendicular to the first main surface 111, and the non-connection region Z2 of the first substrate 11 is a region that does not overlap with and is not connected to the second substrate 12 when viewed from a direction perpendicular to the first main surface 111.

[0072] Preferably, in the first substrate 11, the shortest distance L in the first direction A between the hole 50 and the connection region Z1 is greater than the maximum diameter of the hole 50 in the first direction A. The shortest distance L is, for example, 0.5 mm or more and 10 mm or less, preferably 0.8 mm or more and 7 mm or less, more preferably 1 mm or more and 6.5 mm or less, and even more preferably 1.3 mm or more and 6 mm or less.

[0073] According to the above configuration, the hole 50 can be separated from the connection region Z1, and the extension of the first base material 11 in the vicinity of the connection region Z1 can be further reduced, thereby further suppressing disconnection of the first wiring 21 due to the extension of the first base material 11. When a hole is provided in the second base material 12, it is preferable that the hole has the same configuration as the first base material 11.

[0074] Preferably, a part of the first base material 11 is present between the first wiring 21 and the hole 50 in the second direction B. The shortest distance between the two first wirings 21 is, for example, 0.5 mm, and is preferably 100 μm larger than the diameter of the hole 50, more preferably 200 μm larger than the diameter of the hole 50, and even more preferably 300 μm larger than the diameter of the hole 50. This allows a part of the first base material 11 to be interposed between the first wiring 21 and the hole 50.

[0075] According to the above configuration, the hole 50 is separated from the first wiring 21, and the first wiring 21 can be prevented from being exposed through the hole 50. This reduces the risk of the hole 50 being misaligned and coming into contact with the first wiring 21, and also prevents the first wiring 21 from being damaged from the outside via the hole 50. When a hole is provided in the second base material 12, it is preferable that the hole 50 has the same configuration as the first base material 11.

[0076] Second embodiment 3 is a plan view showing a second embodiment of the stretchable device. The second embodiment differs from the first embodiment in the configuration of the hole. This different configuration will be described below. The other configurations are the same as those of the first embodiment, so the same reference numerals as those of the first embodiment are used and the description thereof will be omitted.

[0077] 3, in the stretchable device 1A of the second embodiment, the first substrate 11 has a plurality of holes 50, and the holes 50 are located on both sides of the first wiring 21 in the second direction B. In the second embodiment, there are two first wirings 21, and therefore there are three holes 50. The plurality of holes 50 are arranged linearly in the second direction B. The hole 50 located on one side of the first wiring 21 in the second direction B corresponds to an example of a "first hole" as described in the claims, and the hole 50 located on the other side of the first wiring 21 in the second direction B corresponds to an example of a "fourth hole" as described in the claims.

[0078] According to the above configuration, the elongation of the first substrate 11 in the vicinity of the multiple holes 50 is increased, and the elongation of the first substrate 11 in the vicinity of the connection region Z1 is reduced, thereby further suppressing breakage of the first wiring 21 due to the elongation of the first substrate 11.

[0079] When holes are provided in the second base material 12, it is preferable that the holes have the same structure as the first base material 11 described above.

[0080] Third embodiment 4 is a plan view showing a third embodiment of the stretchable device. The third embodiment differs from the first embodiment in the configuration of the hole. This different configuration will be described below. The other configurations are the same as those of the first embodiment, so the same reference numerals as those of the first embodiment are used and the description thereof will be omitted.

[0081] 4, in the stretchable device 1B of the third embodiment, a first base material 11 has a plurality of holes 50a, 50b, and 50c, and the plurality of holes 50a, 50b, and 50c are arranged along the first direction A. In the third embodiment, three holes 50a, 50b, and 50c are provided. The plurality of holes 50a, 50b, and 50c are located between two first wirings 21, and are arranged linearly along the first direction A.

[0082] According to the above configuration, the extension of the first substrate 11 near the multiple holes 50a, 50b, and 50c is increased and the extension of the first substrate 11 near the connection region Z1 is reduced, thereby making it possible to further suppress breakage of the first wiring 21 due to the extension of the first substrate 11. In addition, the stress generated when the first substrate 11 is extended in the first direction A can be dispersed to the respective vicinity of the multiple holes 50a, 50b, and 50c, thereby improving the durability of the first substrate 11 and the first wiring 21.

[0083] 4, the multiple holes 50a, 50b, 50c include a first hole 50a that is first closest to the connection region Z1, a second hole 50b that is second closest to the connection region Z1, and a third hole 50c that is third closest to the connection region Z1. That is, the second hole 50b is disposed in the first direction A relative to the first hole 50a, and the first hole 50a is closer to the connection member 40 (connection region Z1) than the second hole 50b. The third hole 50c is disposed in the first direction A relative to the second hole 50b, and the second hole 50b is closer to the connection member 40 (connection region Z1) than the third hole 50c. The first hole portion 50a corresponds to an example of a "first hole portion" as described in the claims, the second hole portion 50b corresponds to an example of a "second hole portion" as described in the claims, and the third hole portion 50c corresponds to an example of a "third hole portion" as described in the claims.

[0084] Preferably, a first shortest distance L1 in the first direction A between the first hole 50a and the connection region Z1 is greater than a second shortest distance L2 in the first direction A between the first hole 50a and the second hole 50b.

[0085] According to the above configuration, the first hole 50a can be separated from the connection region Z1, and the elongation of the first base material 11 near the connection region Z1 can be further reduced. Also, the first hole 50a and the second hole 50b can be brought closer to each other, and the elongation of the first base material 11 near the connection region Z1 can be further increased and the elongation of the first base material 11 near the connection region Z1 can be further reduced.

[0086] Preferably, the second shortest distance L2 is greater than a third shortest distance L3 in the first direction A between the second hole portion 50b and the third hole portion 50c.

[0087] According to the above configuration, the second hole 50b can be separated from the connection region Z1, and the elongation of the first base material 11 near the connection region Z1 can be further reduced. Also, the second hole 50b and the third hole 50c can be brought closer to each other, and the elongation of the first base material 11 near the second and third holes 50b, 50c can be further increased, and the elongation of the first base material 11 near the connection region Z1 can be further reduced. Four or more holes may be aligned along the first direction A, and in that case, the distance between the fourth and subsequent adjacent holes is preferably the third shortest distance L3.

[0088] When holes are provided in the second base material 12, it is preferable that the holes have the same structure as the first base material 11 described above.

[0089] (Fourth embodiment) 5 is a plan view showing a fourth embodiment of the stretchable device. The fourth embodiment differs from the first embodiment in the configuration of the hole. This different configuration will be described below. The other configurations are the same as those of the first embodiment, so the same reference numerals as those of the first embodiment are used and the description thereof will be omitted.

[0090] 5, in the stretchable device 1C of the fourth embodiment, a plurality of holes 51a to 51c, 52a to 52c, and 53a to 53c are present in the first base material 11. Specifically, the plurality of holes 51a to 51c, 52a to 52c, and 53a to 53c include a first group of holes 51a to 51c linearly arranged along the first direction A, a second group of holes 52a to 52c linearly arranged along the first direction A, and a third group of holes 53a to 53c linearly arranged along the first direction A. The first group of holes 51a to 51c, the second group of holes 52a to 52c, and the third group of holes 53a to 53c are arranged in parallel along the second direction B.

[0091] The first group of holes 51a-51c includes a first hole 51a that is first closest to the connection region Z1, a second hole 51b that is second closest to the connection region Z1, and a third hole 51c that is third closest to the connection region Z1. That is, the second hole 51b is disposed in the first direction A relative to the first hole 51a, and the first hole 51a is closer to the connection member 40 (connection region Z1) than the second hole 51b. The third hole 51c is disposed in the first direction A relative to the second hole 51b, and the second hole 51b is closer to the connection member 40 (connection region Z1) than the third hole 51c. Similarly, the second group of holes 52a-52c includes a first hole 52a closest to the connection region Z1, a second hole 52b second closest to the connection region Z1, and a third hole 52c third closest to the connection region Z1. The third group of holes 53a-53c includes a first hole 53a closest to the connection region Z1, a second hole 53b second closest to the connection region Z1, and a third hole 53c third closest to the connection region Z1.

[0092] First, with respect to the first wiring 21 on the upper side of Figure 5, the first group of holes 51a to 51c are located on one side (upper side) of the second direction B with respect to the upper first wiring 21, and the second group of holes 52a to 52c are located on the other side (lower side) of the second direction B with respect to the upper first wiring 21. In this case, in the first group of holes 51a-51c, the first hole 51a corresponds to an example of the "first hole" in the claims, the second hole 51b corresponds to an example of the "second hole" in the claims, and the third hole 51c corresponds to an example of the "third hole" in the claims. In addition, in the second group of holes 52a-52c, the first hole 52a corresponds to an example of the "fourth hole" in the claims, and the second hole 52b corresponds to an example of the "fifth hole" in the claims.

[0093] The first group of holes 51a to 51c and the second group of holes 52a to 52c are alternately arranged along the first direction A. At this time, the center 510a of the first hole 51a of the first group and the center 520a of the first hole 52a of the second group do not overlap in the second direction B. Moreover, the center of the second hole 51b of the first group and the center of the second hole 52b of the second group do not overlap in the second direction B. Moreover, the center of the third hole 51c of the first group and the center of the third hole 52c of the second group do not overlap in the second direction B. In other words, the first group of holes 51a to 51c and the second group of holes 52a to 52c are arranged in a staggered manner with respect to the first wiring 21. In addition, in the first direction A, the shortest distance between the first hole 51a of the first group and the connection member 40 (connection region Z1) is different from the shortest distance between the first hole 52a of the second group and the connection member 40 (connection region Z1). In addition, in the first direction A, the shortest distance between the second hole 51b of the first group and the connection member 40 (connection region Z1) is different from the shortest distance between the second hole 52b of the second group and the connection member 40 (connection region Z1). In addition, in the first direction A, the shortest distance between the third hole 51c of the first group and the connection member 40 (connection region Z1) is different from the shortest distance between the third hole 52c of the second group and the connection member 40 (connection region Z1).

[0094] According to the above configuration, since the first group of holes 51a-51c and the second group of holes 52a-52c are included, the extension of the first base material 11 near the plurality of holes 51a-51c, 52a-52c is increased and the extension of the first base material 11 near the connection region Z1 is reduced, thereby making it possible to further suppress disconnection of the first wiring 21 due to the extension of the first base material 11. Also, since the first group of holes 51a-51c and the second group of holes 52a-52c are arranged in a staggered pattern with respect to the first wiring 21, the load on the first wiring 21 caused by the extension of the first base material 11 near the plurality of holes 51a-51c, 52a-52c can be reduced. Furthermore, the shortest distance between the first hole 51a of the first group and the connecting member 40 is different from the shortest distance between the first hole 52a of the second group and the connecting member 40, the shortest distance between the second hole 51b of the first group and the connecting member 40 is different from the shortest distance between the second hole 52b of the second group and the connecting member 40, and the shortest distance between the third hole 51c of the first group and the connecting member 40 is different from the shortest distance between the third hole 52c of the second group and the connecting member 40, so that the load on the first wiring 21 caused by elongation in the vicinity of the multiple holes 51a-51c, 52a-52c of the first substrate 11 can be reduced.

[0095] Similarly, with respect to the first wiring 21 on the lower side of Figure 5, the second group of holes 52a to 52c are located on one side (upper side) of the second direction B relative to the lower first wiring 21, and the third group of holes 53a to 53c are located on the other side (lower side) of the second direction B relative to the lower first wiring 21. In this case, in the second group of holes 52a-52c, the first hole 52a corresponds to an example of the "first hole" in the claims, the second hole 52b corresponds to an example of the "second hole" in the claims, and the third hole 52c corresponds to an example of the "third hole" in the claims. In addition, in the third group of holes 53a-53c, the first hole 53a corresponds to an example of the "fourth hole" in the claims, and the second hole 53b corresponds to an example of the "fifth hole" in the claims.

[0096] The second group of holes 52a to 52c and the third group of holes 53a to 53c are alternately arranged along the first direction A. At this time, the center 520a of the first hole 52a of the second group and the center 530a of the first hole 53a of the third group do not overlap in the second direction B. Moreover, the center of the second hole 52b of the second group and the center of the second hole 53b of the third group do not overlap in the second direction B. Moreover, the center of the third hole 52c of the second group and the center of the third hole 53c of the third group do not overlap in the second direction B. In other words, the second group of holes 52a to 52c and the third group of holes 53a to 53c are arranged in a staggered manner with respect to the first wiring 21. In addition, in the first direction A, the shortest distance between the first hole 52a of the second group and the connection member 40 (connection region Z1) is different from the shortest distance between the first hole 53a of the third group and the connection member 40 (connection region Z1). In addition, in the first direction A, the shortest distance between the second hole 52b of the second group and the connection member 40 (connection region Z1) is different from the shortest distance between the second hole 53b of the third group and the connection member 40 (connection region Z1). In addition, in the first direction A, the shortest distance between the third hole 52c of the second group and the connection member 40 (connection region Z1) is different from the shortest distance between the third hole 53c of the third group and the connection member 40 (connection region Z1).

[0097] According to the above configuration, since the second group of holes 52a-52c and the third group of holes 53a-53c are included, the extension of the first base material 11 near the holes 52a-52c, 53a-53c is increased and the extension of the first base material 11 near the connection region Z1 is reduced, thereby making it possible to further suppress breakage of the first wiring 21 due to the extension of the first base material 11. Also, since the second group of holes 52a-52c and the third group of holes 53a-53c are arranged in a staggered pattern with respect to the first wiring 21, the load on the first wiring 21 caused by the extension of the first base material 11 near the holes 52a-52c, 53a-53c can be reduced. Furthermore, the shortest distance between the first hole 52a of the second group and the connecting member 40 is different from the shortest distance between the first hole 53a of the third group and the connecting member 40, the shortest distance between the second hole 52b of the second group and the connecting member 40 is different from the shortest distance between the second hole 53b of the third group and the connecting member 40, and the shortest distance between the third hole 52c of the second group and the connecting member 40 is different from the shortest distance between the third hole 53c of the third group and the connecting member 40, so that the load on the first wiring 21 caused by elongation in the vicinity of the multiple holes 52a-52c, 53a-53c of the first substrate 11 can be reduced.

[0098] Note that a plurality of holes arranged in a staggered pattern may be provided on both sides in the second direction B for either one of the upper and lower first wirings 21.

[0099] 5, the entire first hole 51a of the first group and the entire first hole 52a of the second group do not overlap in the second direction B. Moreover, the entire second hole 51b of the first group and the entire second hole 52b of the second group do not overlap in the second direction B. Moreover, the entire third hole 51c of the first group and the entire third hole 52c of the second group do not overlap in the second direction B. With the above configuration, the load on the first wiring 21 caused by the extension of the first substrate 11 near the holes 51a-51c, 52a-52c can be further reduced.

[0100] Similarly, the entirety of the first hole 52a of the second group and the entirety of the first hole 53a of the third group do not overlap in the second direction B. Moreover, the entirety of the second hole 52b of the second group and the entirety of the second hole 53b of the third group do not overlap in the second direction B. Moreover, the entirety of the third hole 52c of the second group and the entirety of the third hole 53c of the third group do not overlap in the second direction B. With the above configuration, the load on the first wiring 21 caused by the extension of the first substrate 11 near the holes 52a-52c, 53a-53c can be further reduced.

[0101] Alternatively, a portion of the first hole 51a of the first group and a portion of the first hole 52a of the second group may overlap in the second direction B, a portion of the second hole 51b of the first group and a portion of the second hole 52b of the second group may overlap in the second direction B, and a portion of the third hole 51c of the first group and a portion of the third hole 52c of the second group may overlap in the second direction B. According to the above configuration, the extension of the first base material 11 near the multiple holes 51a to 51c and 52a to 52c is further increased, and the extension of the first base material 11 near the connection region Z1 is further reduced, thereby making it possible to further suppress breakage of the first wiring 21 due to the extension of the first base material 11.

[0102] Similarly, a portion of the first hole 52a of the second group and a portion of the first hole 53a of the third group may overlap in the second direction B, a portion of the second hole 52b of the second group and a portion of the second hole 53b of the third group may overlap in the second direction B, and a portion of the third hole 52c of the second group and a portion of the third hole 53c of the third group may overlap in the second direction B. According to the above configuration, the extension of the first base material 11 in the vicinity of the multiple holes 52a to 52c and 53a to 53c is further increased, and the extension of the first base material 11 in the vicinity of the connection region Z1 is further reduced, thereby making it possible to further suppress breakage of the first wiring 21 due to the extension of the first base material 11.

[0103] When holes are provided in the second base material 12, it is preferable that the holes have the same structure as the first base material 11 described above.

[0104] Fifth embodiment 6 is a plan view showing a fifth embodiment of the stretchable device. The fifth embodiment differs from the fourth embodiment in the configuration of the hole. This different configuration will be described below. The other configurations are the same as those of the fourth embodiment, so the same reference numerals as those of the fourth embodiment are used and the description thereof will be omitted.

[0105] As shown in FIG. 6, in the stretchable device 1D of the fifth embodiment, at least a portion of the hole 51a closest to the connection region Z1 among the first group of holes 51a-51c and at least a portion of the hole 52a closest to the connection region Z1 among the second group of holes 52a-52c overlap in the second direction B, and the centers of the other holes 51b, 51c among the first group of holes 51a-51c and the centers of the other holes 52b, 52c among the second group of holes 52a-52c do not overlap in the second direction B.

[0106] Specifically, at least a portion of the first hole 51a of the first group and at least a portion of the first hole 52a of the second group overlap in the second direction B. Moreover, the center of the second hole 51b of the first group and the center of the second hole 52b of the second group do not overlap in the second direction B. Moreover, the center of the third hole 51c of the first group and the center of the third hole 52c of the second group do not overlap in the second direction B. In other words, the holes 51b, 51c of the first group and the holes 52b, 52c of the second group are arranged in a staggered pattern with respect to the first wiring 21. In addition, in the first direction A, the shortest distance between the first hole 51a of the first group and the connection member 40 (connection region Z1) is equal to the shortest distance between the first hole 52a of the second group and the connection member 40 (connection region Z1). In addition, in the first direction A, the shortest distance between the second hole 51b of the first group and the connection member 40 (connection region Z1) is different from the shortest distance between the second hole 52b of the second group and the connection member 40 (connection region Z1). In addition, in the first direction A, the shortest distance between the third hole 51c of the first group and the connection member 40 (connection region Z1) is different from the shortest distance between the third hole 52c of the second group and the connection member 40 (connection region Z1).

[0107] According to the above configuration, since the first group of holes 51a-51c and the second group of holes 52a-52c are included, the extension of the first base material 11 near the plurality of holes 51a-51c, 52a-52c is increased and the extension of the first base material 11 near the connection region Z1 is reduced, thereby making it possible to further suppress disconnection of the first wiring 21 due to the extension of the first base material 11. In addition, since the first group of holes 51b, 51c and the second group of holes 52b, 52c are arranged in a staggered pattern with respect to the first wiring 21, the load on the first wiring 21 caused by the extension of the first base material 11 near the plurality of holes 51b, 51c, 52b, 52c can be reduced. Furthermore, the shortest distance between the first hole 51a of the first group and the connecting member 40 is equal to the shortest distance between the first hole 52a of the second group and the connecting member 40, the shortest distance between the second hole 51b of the first group and the connecting member 40 is different from the shortest distance between the second hole 52b of the second group and the connecting member 40, and the shortest distance between the third hole 51c of the first group and the connecting member 40 is different from the shortest distance between the third hole 52c of the second group and the connecting member 40, so that the load on the first wiring 21 caused by elongation in the vicinity of the multiple holes 51a-51c, 52a-52c of the first substrate 11 can be reduced.

[0108] Similarly, at least a portion of hole 52a among the second group of holes 52a-52c that is closest to connection region Z1 and at least a portion of hole 53a among the third group of holes 53a-53c that is closest to connection region Z1 overlap in the second direction B, and the centers of the other holes 52b, 52c among the second group of holes 52a-52c and the centers of the other holes 53b, 53c among the third group of holes 53a-53c do not overlap in the second direction B.

[0109] Specifically, at least a portion of the first hole 52a of the second group and at least a portion of the first hole 53a of the third group overlap in the second direction B. Moreover, the center of the second hole 52b of the second group and the center of the second hole 53b of the third group do not overlap in the second direction B. Moreover, the center of the third hole 52c of the second group and the center of the third hole 53c of the third group do not overlap in the second direction B. In other words, the holes 52b, 52c of the second group and the holes 53b, 53c of the third group are arranged in a staggered pattern with respect to the first wiring 21. In addition, in the first direction A, the shortest distance between the first hole 52a of the second group and the connection member 40 (connection region Z1) is equal to the shortest distance between the first hole 53a of the third group and the connection member 40 (connection region Z1). In addition, in the first direction A, the shortest distance between the second hole 52b of the second group and the connection member 40 (connection region Z1) is different from the shortest distance between the second hole 53b of the third group and the connection member 40 (connection region Z1). In addition, in the first direction A, the shortest distance between the third hole 52c of the second group and the connection member 40 (connection region Z1) is different from the shortest distance between the third hole 53c of the third group and the connection member 40 (connection region Z1).

[0110] According to the above configuration, since the second group of holes 52a-52c and the third group of holes 53a-53c are included, the extension of the first base material 11 near the plurality of holes 52a-52c, 53a-53c is increased and the extension of the first base material 11 near the connection region Z1 is reduced, thereby making it possible to further suppress breakage of the first wiring 21 due to the extension of the first base material 11. In addition, since the second group of holes 52b, 52c and the third group of holes 53b, 53c are arranged in a staggered manner with respect to the first wiring 21, the load on the first wiring 21 caused by the extension of the first base material 11 near the plurality of holes 52b, 52c, 53b, 53c can be reduced. Furthermore, the shortest distance between the first hole 52a of the second group and the connecting member 40 is equal to the shortest distance between the first hole 53a of the third group and the connecting member 40, the shortest distance between the second hole 52b of the second group and the connecting member 40 is different from the shortest distance between the second hole 53b of the third group and the connecting member 40, and the shortest distance between the third hole 52c of the second group and the connecting member 40 is different from the shortest distance between the third hole 53c of the third group and the connecting member 40, so that the load on the first wiring 21 caused by elongation in the vicinity of the multiple holes 52a-52c, 53a-53c of the first substrate 11 can be reduced.

[0111] When holes are provided in the second base material 12, it is preferable that the holes have the same structure as the first base material 11 described above.

[0112] Sixth embodiment Fig. 7 is a plan view showing a sixth embodiment of the stretchable device. Fig. 8 is a cross-sectional view taken along line VIII-VIII in Fig. 7. The sixth embodiment differs from the first embodiment in that a protective film is provided. This different configuration will be described below. The other configurations are the same as those of the first embodiment, and the same reference numerals as those of the first embodiment will be used and the description thereof will be omitted.

[0113] 7 and 8, the stretchable device 1E of the sixth embodiment further includes a protective film 60 that covers at least a part of the first main surface 111 of the first base material 11 and at least a part of the first wiring 21. The protective film 60 has insulating properties. The protective film 60 is formed of a resin material, for example, a styrene resin, an olefin resin, an epoxy resin, a urethane resin, an acrylic resin, or a silicone resin.

[0114] According to the above configuration, the protective film 60 covers at least a part of the first wiring 21, so that insulation from external disturbance factors can be ensured, and the first wiring 21 can be prevented from directly contacting the skin, so that discomfort to the user can be suppressed. 、 Since the protective film 60 covers at least a part of the first main surface 111 of the first base material 11, it is possible to prevent the first base material 11 from directly contacting the skin, and to suppress the effects of moisture generated by the user.

[0115] 7 and 8, the protective film 60 has a through hole 60a that overlaps with the hole 50 when viewed from a direction perpendicular to the first main surface 111. Preferably, the size of the through hole 60a is the same as the size of the hole 50. According to the above configuration, even if the protective film 60 is provided, it is possible to increase the elongation of the first base material 11 near the hole 50 and to reduce the elongation of the first base material 11 near the connection region Z1.

[0116] FIG. 9 shows another form of the protective film. As shown in FIG. 9, the protective film 60A has an overlapping portion 60b that overlaps with the hole 50 when viewed from a direction perpendicular to the first main surface 111. The overlapping portion 60b does not enter the inside of the hole 50 but is located outside the hole 50. Preferably, the overlapping portion 60b is located on the same plane as the first main surface 111. According to the above configuration, the internal space of the hole 50 can be secured, the extension of the first base material 11 near the hole 50 can be increased, and the extension of the first base material 11 near the connection region Z1 can be reduced. Note that the overlapping portion 60b does not need to overlap the entire hole 50, but only needs to overlap a part of the hole 50.

[0117] The protective film may be provided on the second main surface 112 of the first base material 11. The protective film may be provided on the third main surface 121 of the second base material 12 and on the second wiring 22, or on the fourth main surface 122 of the second base material 12.

[0118] The present disclosure is not limited to the above-described embodiments, and design modifications are possible without departing from the scope of the present disclosure. For example, the respective characteristic points of the first to sixth embodiments may be combined in various ways.

[0119] In the above embodiment, the number of the first substrates and the second substrates may be increased, and in this case, a plurality of the first substrates and a plurality of the second substrates may be connected in series. In addition, the number of the first wirings and the second wirings may be increased or decreased, and the number of the holes may be increased or decreased.

[0120] In the above embodiment, the first substrate and the second substrate are rectangular, but are not limited to a rectangular shape and may be, for example, a polygonal shape, an elliptical shape, or an oval shape.

[0121] (First Example) FIG. 10 is a plan view illustrating a first embodiment of a stretchable device. As shown in FIG. 10, two first wirings 21 were formed on a first substrate 11. A hole 50 having a diameter of 0.5 mm, 1.0 mm, or 1.5 mm was formed in the first substrate 11. The first substrate 11 was stretched to twice its original length in a first direction A. At this time, the shortest distance L from the connection region Z1 (connection member 40) to the hole 50 was changed between 0.1 mm and 14 mm, and the unit displacement amount in the vicinity of the connection region Z1 of the first substrate 11 was calculated. As a comparative example, a case without a hole was calculated.

[0122] The results are shown in Figure 11. In Figure 11, the horizontal axis indicates the shortest distance L from the connection region Z1 to the hole 50, and the vertical axis indicates the unit displacement of the first substrate 11 in the vicinity of the connection region Z1. Circles indicate when the diameter of the hole 50 is 0.5 mm, triangles indicate when the diameter of the hole 50 is 1.0 mm, and squares indicate when the diameter of the hole 50 is 1.5 mm. The two-dot chain line indicates the case where there is no hole.

[0123] 11, when the shortest distance L is in the vicinity of the connection area Z1 (0.5 mm or less), the unit displacement amount of the first substrate 11 in the vicinity of the connection area Z1 becomes large, the first substrate 11 in the vicinity of the connection area Z1 stretches, and the first wiring 21 in the vicinity of the connection area Z1 becomes more likely to break. In other words, it was confirmed that when the shortest distance L is 0.5 mm or less, the first substrate 11 in the vicinity of the connection area Z1 stretches more than when no hole is provided.

[0124] On the other hand, when the shortest distance L is 0.5 mm or more and 14 mm or less, the unit displacement amount of the first substrate 11 in the vicinity of the connection region Z1 is smaller than when no hole is provided, and it is found that the elongation of the first substrate 11 in the vicinity of the connection region Z1 is reduced. Also, as can be seen from Fig. 11, the shortest distance L is preferably 0.8 mm or more and 7 mm or less, more preferably 1 mm or more and 6.5 mm or less, and further preferably 1.3 mm or more and 6 mm or less, and it is found that the elongation of the first substrate 11 in the vicinity of the connection region Z1 is further reduced.

[0125] (Second Example) FIG. 12 is a plan view illustrating a second embodiment of the stretchable device. As shown in FIG. 12, four first wirings 21 were formed on the first substrate 11. Holes 50 with a diameter of 1.0 mm were formed on the first substrate 11. The shortest distance L from the connection area Z1 (connection member 40) to the holes 50 was set to 3.0 mm. The first substrate 11 was stretched twice in the first direction A. At this time, the number of holes 50 was changed to one, three, or five, and the unit displacement amount in the vicinity of the connection area Z1 of the first substrate 11 was calculated. The holes 50 were increased in the second direction B. As a comparative example, a case in which there were no holes was calculated.

[0126] The results are shown in Fig. 13. In Fig. 13, the horizontal axis represents the number of holes 50, and the vertical axis represents the unit displacement of the first substrate 11 in the vicinity of the connection region Z1. As shown in Fig. 13, it was confirmed that an increase in the number of holes 50 reduces the unit displacement of the first substrate 11 in the vicinity of the connection region Z1, and thus reduces the elongation of the first substrate 11 in the vicinity of the connection region Z1.

[0127] (Third Example) FIG. 14 is a plan view illustrating a third embodiment of the stretchable device. As shown in FIG. 14, four first wirings 21 were formed on the first substrate 11. Five holes 50 with a diameter of 1.0 mm were formed on the first substrate 11. The five holes 50 were arranged in a row in the second direction B. The first substrate 11 was stretched twice in the first direction A. At this time, the shortest distance L from the connection region Z1 (connection member 40) to the hole 50 was changed to 1.5 mm, 3.0 mm, and 4.5 mm, and the unit displacement amount in the vicinity of the connection region Z1 of the first substrate 11 was calculated. As a comparative example, a case in which there was no hole was calculated.

[0128] The results are shown in Fig. 15. In Fig. 15, the horizontal axis indicates the shortest distance from the connection region Z1 to the hole 50, and the vertical axis indicates the unit displacement of the first substrate 11 in the vicinity of the connection region Z1. As shown in Fig. 15, it was confirmed that by arranging the holes 50 in a row, the unit displacement of the first substrate 11 in the vicinity of the connection region Z1 is small, and the elongation of the first substrate 11 in the vicinity of the connection region Z1 is reduced. In particular, it was confirmed that the elongation of the first substrate 11 in the vicinity of the connection region Z1 is reduced the most by setting the shortest distance L to 3.0 mm.

[0129] (Fourth Example) FIG. 16 is a plan view for explaining a fourth embodiment of the stretchable device. As shown in FIG. 16, four first wirings 21 were formed on the first substrate 11. Holes 55, 56 with a diameter of 1.0 mm were formed on the first substrate 11. Five holes 55, 56 were arranged in the second direction B to form a set, and two sets were arranged in the first direction A. That is, five holes 55 in a first row and five holes 56 in a second row were formed in order from the position closest to the connection area Z1. The shortest distance L5 from the connection area Z1 (connection member 40) to the five holes 55 in the first row was set to 3.0 mm. The first substrate 11 was stretched twice in the first direction A. At this time, the shortest distance L6 from the connection area Z1 (connection member 40) to the five holes 56 in the second row was changed to 4.1 mm, 4.5 mm, and 5.5 mm, and the unit displacement amount in the vicinity of the connection area Z1 of the first substrate 11 was calculated.

[0130] The results are shown in Fig. 17. In Fig. 17, the horizontal axis indicates the shortest distance from the connection region Z1 to the second row of five holes 56, and the vertical axis indicates the unit displacement of the first substrate 11 in the vicinity of the connection region Z1. As shown in Fig. 17, by providing the second row of five holes 56, the unit displacement of the first substrate 11 in the vicinity of the connection region Z1 is smaller than that in Fig. 15, and it was confirmed that the elongation of the first substrate 11 in the vicinity of the connection region Z1 is reduced. In particular, it was confirmed that the elongation of the first substrate 11 in the vicinity of the connection region Z1 is reduced the most by setting the shortest distance to the second row of five holes 56 to 4.5 mm.

[0131] (Fifth Example) FIG. 18 is a plan view for explaining the fifth embodiment of the stretchable device. As shown in FIG. 18, four first wirings 21 were formed on the first substrate 11. Holes 55, 56 having a diameter of 1.0 mm were formed on the first substrate 11. Five holes 55, 56 were arranged in the second direction B to form a set, and for example, a plurality of sets were arranged in the first direction A. Specifically, five holes 55 in a first row and five holes 56 in a second row were formed in order from the position closest to the connection region Z1. The shortest distance L5 from the connection region Z1 (connection member 40) to the five holes 55 in the first row was set to 3.0 mm. The first substrate 11 was stretched twice in the first direction A.

[0132] At this time, the unit displacement amount near the connection area Z1 of the first base material 11 was calculated by increasing the number of holes in the first row from the first row of holes 55 to the second row of holes 56, the third row of holes, the fourth row of holes, and the fifth row of holes in that order. The shortest distance L6 from the connection area Z1 to the five holes in the second row was set to 4.5 mm, the shortest distance from the connection area Z1 to the five holes in the third row was set to 6.0 mm, the shortest distance from the connection area Z1 to the five holes in the fourth row was set to 7.5 mm, and the shortest distance from the connection area Z1 to the five holes in the fifth row was set to 9.5 mm. In other words, the interval P between adjacent holes in the first direction A was set to 0.5 mm.

[0133] The results are shown in Figure 19. In Figure 19, the horizontal axis shows the number of rows of holes, and the vertical axis shows the unit displacement of the first substrate 11 near the connection region Z1. The two-dot chain line shows the case where there are no holes. As shown in Figure 19, by increasing the number of rows of holes, the unit displacement of the first substrate 11 near the connection region Z1 becomes smaller, and it was confirmed that the elongation of the first substrate 11 near the connection region Z1 is reduced. In particular, it can be seen that the first, second and third rows of holes contribute greatly to the reduction in elongation of the first substrate 11 near the connection region Z1.

[0134] (Sixth Example) In the third and fifth examples, the amount of expansion of the stretchable device was measured when the wiring (the first wiring or the second wiring) was broken near the connection region.

[0135] Specifically, in the third embodiment, four wirings containing silver were printed on each of the first and second substrates using a dispenser. The wiring width was 0.5 mm, the wiring length was 15 mm, and the wiring interval was 1 mm. The first and second substrates were joined by a connecting member (ACF). Five holes with a diameter of 0.7 mm were formed in each of the first and second substrates by laser processing. The five holes were arranged in a line in a direction perpendicular to the first direction. The shortest distance from the connection region (connecting member) to the holes was set to 3.0 mm. Then, the ends of the first and second substrates were gripped, and the first and second substrates were extended in the first direction by 1 mm each until the wiring broke. As a result, a break was confirmed when the first and second substrates were extended by 22 mm.

[0136] In the fifth embodiment, four silver-containing wires were printed on each of the first and second substrates using a dispenser. The wire width was 0.5 mm, the wire length was 15 mm, and the wire spacing was 1 mm. The first and second substrates were joined by a connecting member (ACF). Holes with a diameter of 0.7 mm were formed in each of the first and second substrates by laser processing. Five holes were formed in four rows. The shortest distance from the connection area to the first row of holes was 3.0 mm, the shortest distance from the connection area to the second row of holes was 4.5 mm, the shortest distance from the connection area to the third row of holes was 5.5 mm, and the shortest distance from the connection area to the fourth row of holes was 6.7 mm. Then, the ends of the first and second substrates were gripped, and the first and second substrates were stretched in the first direction by 1 mm each until the wires were broken. As a result, breakage was confirmed when the first and second substrates were stretched by 24 mm.

[0137] As a first comparative example, four silver-containing wires were printed on each of the first and second substrates using a dispenser. The wire width was 0.5 mm, the wire length was 15 mm, and the wire spacing was 0.5 mm. The first and second substrates were joined with a connecting member (ACF). Then, the first and second substrates were each held at their respective ends and stretched in the first direction by 1 mm each until the wires broke. As a result, breakage was confirmed when the first and second substrates were stretched by 18 mm.

[0138] As a second comparative example, four wirings containing silver were printed on each of the first and second substrates using a dispenser. The wiring width was set to 0.5 mm, the wiring length was set to 15 mm, and the wiring interval was set to 1 mm. The first and second substrates were joined by a connecting member (ACF). Five holes with a diameter of 0.7 mm were formed in each of the first and second substrates by laser processing. The five holes were arranged in a line in a direction perpendicular to the first direction. The shortest distance from the connection region (connecting member) to the holes was set to 0.2 mm. Then, the first and second substrates were each held at their respective ends, and the first and second substrates were stretched in the first direction by 1 mm each until the wiring broke. As a result, breakage was confirmed when the first and second substrates were stretched by 16 mm.

[0139] The results are shown in Fig. 20. Fig. 20 shows the extension amount of the stretchable device when the wiring is disconnected near the connection area in each of the third embodiment, the fifth embodiment, the first comparative example, and the second comparative example. As is clear from Fig. 20, in the third embodiment and the fifth embodiment, the extension amount of the stretchable device is larger than in the first comparative example and the second comparative example, and it is found that disconnection of the wiring is less likely to occur near the connection area.

[0140] In the above description, hole portion 50 corresponding to the first hole portion described in the claims is closest to the connecting member among the multiple holes including other holes arranged in the first direction relative to the first hole portion on the first main surface, but the present invention is not limited to such a structure, and a different hole portion 50 may be arranged between hole portion 50 corresponding to the first hole portion and the connecting member. [Explanation of symbols]

[0141] 1. 1A~1E Stretchable Device 11 First base material 111 First main surface 112 Second main surface 12 Second base material 121 Third main surface 122 4th main surface 21 1st wiring 22 2nd wiring 40 Connection member 50 Hole 50a, 51a, 52a, 53a 1st hole 50b, 51b, 52b, 53b 2nd hole 50c, 51c, 52c, 53c 3rd hole 510a, 520a, 530a center 55 First row holes 56 Second row hole 60, 60A Protective film 60a Through hole 60b Overlapping part A 1st direction B Second direction L Shortest distance L1 1st shortest distance L2 Second shortest distance L3 3rd shortest distance L5 Shortest distance between holes in the first row L6 Shortest distance between holes in the second row P Hole Spacing Z1 Connection Area Z2 Unconnected area

Claims

1. A stretchable first substrate having a first main surface and a second main surface opposed to each other and extending in a first direction; A stretchable first wiring provided on the first main surface and extending along the first main surface; a second substrate having a third main surface and a fourth main surface opposed to each other; a second wiring provided on the third main surface and extending along the third main surface; a connection member that connects the first base material and the second base material; Equipped with the first base material includes a connection region that overlaps with the second base material and a non-connection region that does not overlap with the second base material when viewed in a direction perpendicular to the first main surface, the connection member overlaps the connection region when viewed in a direction perpendicular to the first main surface, the first base material has a plurality of first holes provided in at least one of the first main surface and the second main surface in the non-connected region, The plurality of first holes are arranged along a predetermined direction, a second hole portion disposed in the first direction relative to the first hole portion, the first hole is closer to the connection region than the second hole; A stretchable device, wherein in the first direction, a shortest distance between the connection region and the first hole is greater than a shortest distance between the first hole and the second hole.

2. A stretchable first substrate having a first main surface and a second main surface opposed to each other and extending in a first direction; A stretchable first wiring provided on the first main surface and extending along the first main surface; a second substrate having a third main surface and a fourth main surface opposed to each other; a second wiring provided on the third main surface and extending along the third main surface; Equipped with the first base material includes a connection region that overlaps with the second base material and a non-connection region that does not overlap with the second base material when viewed in a direction perpendicular to the first main surface, the first substrate and the second substrate are connected in the connection region; the first base material has a plurality of first holes provided in at least one of the first main surface and the second main surface in the non-connected region, The plurality of first holes are arranged along a predetermined direction, a second hole portion disposed in the first direction relative to the first hole portion, the first hole is closer to the connection region than the second hole; A stretchable device, wherein in the first direction, a shortest distance between the connection region and the first hole is greater than a shortest distance between the first hole and the second hole.

3. The stretchable device according to claim 1 , wherein the first holes are arranged along an extension direction of the first wiring.

4. The stretchable device according to claim 1 , wherein the first holes are arranged along a direction perpendicular to an extension direction of the first wiring.

5. The stretchable device according to claim 1 , wherein the first hole penetrates the first base material.

6. 3 . The stretchable device according to claim 1 , wherein a minimum distance in the first direction between the first hole portion and the connection region is greater than a maximum diameter of the first hole portion in the first direction.

7. The stretchable device according to claim 1 , wherein a portion of the first substrate is present between the first wiring and the first hole in a second direction perpendicular to the first direction.

8. a third hole portion disposed in the first direction relative to the first hole portion and the second hole portion, the second hole is closer to the connection region than the third hole; 3. The stretchable device according to claim 1, wherein a shortest distance between the first hole and the second hole in the first direction is greater than a shortest distance between the second hole and the third hole.

9. Further comprising a fourth hole; The stretchable device according to claim 1 , wherein the first wiring is disposed between the first hole portion and the fourth hole portion.

10. a fifth hole portion disposed in the first direction relative to the fourth hole portion, The stretchable device according to claim 9 , wherein in the first direction, the fourth hole portion is closer to the connection region than the fifth hole portion.

11. In the first direction, the first hole portion is closer to the connection region than the second hole portion; In the first direction, a shortest distance between the first hole portion and the connection region is different from a shortest distance between the fourth hole portion and the connection region, The stretchable device according to claim 10 , wherein a shortest distance between the second hole and the connection region in the first direction is different from a shortest distance between the fifth hole and the connection region.

12. The stretchable device according to claim 11, wherein the second hole portion arranged in the first direction with respect to the first hole portion and the fifth hole portion arranged in the first direction with respect to the fourth hole portion are arranged in a staggered pattern.

13. In the first direction, the first hole portion is closer to the connection region than the second hole portion; In the first direction, a shortest distance between the first hole portion and the connection region is equal to a shortest distance between the fourth hole portion and the connection region, The stretchable device according to claim 10 , wherein a shortest distance between the second hole and the connection region in the first direction is different from a shortest distance between the fifth hole and the connection region.

14. The stretchable device according to claim 13, wherein the second hole portion arranged in the first direction with respect to the first hole portion and the fifth hole portion arranged in the first direction with respect to the fourth hole portion are arranged in a staggered pattern.

15. The stretchable device according to claim 1 or 2, further comprising a protective film covering at least a portion of the first main surface of the first base material and at least a portion of the first wiring.

16. The stretchable device according to claim 15 , wherein the protective film has a through hole overlapping the first hole portion when viewed in a direction perpendicular to the first main surface.

17. the protective film has an overlapping portion that overlaps with the first hole portion when viewed in a direction perpendicular to the first main surface, The stretchable device of claim 15 , wherein the overlapping portion is located outside the first hole portion.

18. A first substrate having a first main surface and a second main surface opposed to each other and extending in a first direction; A stretchable first wiring provided on the first main surface and extending along the first main surface; a second substrate having a third main surface and a fourth main surface opposed to each other; a second wiring provided on the third main surface and extending along the third main surface; a connection member that connects the first base material and the second base material; Equipped with the first base material includes a connection region that overlaps with the second base material and a non-connection region that does not overlap with the second base material when viewed in a direction perpendicular to the first main surface, the connection member overlaps the connection region when viewed in a direction perpendicular to the first main surface, the first base material has a plurality of first holes provided in at least one of the first main surface and the second main surface in the non-connected region, The plurality of first holes are arranged along a predetermined direction, Further comprising a fourth hole; the first wiring is disposed between the first hole and the fourth hole, a fifth hole portion disposed in the first direction relative to the fourth hole portion, In the first direction, the fourth hole portion is closer to the connection region than the fifth hole portion; a second hole portion disposed in the first direction relative to the first hole portion, In the first direction, the first hole portion is closer to the connection region than the second hole portion; In the first direction, a shortest distance between the first hole portion and the connection region is different from a shortest distance between the fourth hole portion and the connection region, A stretchable device, wherein a shortest distance between the second hole portion and the connection region in the first direction is different from a shortest distance between the fifth hole portion and the connection region.

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