stretchable devices

Abstract

The purpose of the present invention is to provide a stretchable device capable of relaxing stress between a stretchable wire and a mounted electronic component at the time of expansion and contraction.　A stretchable device (100) comprises: a stretchable base material (10); stretchable wires (20, 30) provided on one main surface of the stretchable base material (10); an electronic component (50) provided so as to be electrically connectable to the stretchable wires (20, 30); and an adhesive layer provided on the other main surface of the stretchable base material (10). At least one of the stretchable base material (10) and the adhesive layer has a discontinuous region (11).

Description

[Technical Field]

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

[0002] Conventionally, a stretchable device has been known that includes a stretchable substrate, stretchable wiring provided on one main surface of the stretchable substrate, an electronic component mounted so as to be electrically connectable to the stretchable wiring, and an adhesive layer provided on the other main surface of the stretchable substrate. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2020-181958 [Patent Document 2] Patent Publication No. 2021-100142 [Patent Document 3] Japanese Patent Publication No. 2022-19237 Summary of the Invention [Problem to be solved by the invention]

[0004] The inventors of the present application have found that conventional stretchable devices require improvement in the following respects: Specifically, while the stretchable substrate and stretchable wiring are stretchable, the mounted electronic components are non-stretchable, and therefore, stress generated when the stretchable substrate etc. stretches and contracts may make it difficult to ensure the mounting reliability of the non-stretchable electronic components.

[0005] Therefore, an object of the present invention is to provide a stretchable device that can suitably ensure the mounting reliability of electronic components even when stretched. [Means for solving the problem]

[0006] In order to achieve the above object, in one embodiment of the present invention, The device comprises a stretchable substrate, a stretchable wiring provided on one main surface of the stretchable substrate, an electronic component provided so as to be electrically connectable to the stretchable wiring, and an adhesive layer provided on the other main surface of the stretchable substrate, A stretchable device is provided, wherein at least one of the stretchable substrate and the adhesive layer has discontinuous regions. [Effects of the Invention]

[0007] According to the stretchable device according to one embodiment of the present invention, it is possible to preferably ensure the mounting reliability of electronic components even when stretched. [Brief explanation of the drawings]

[0008] [Figure 1A] FIG. 1A is a plan view schematically showing a stretchable device according to a first embodiment of the present invention. [Figure 1B] FIG. 1B is a schematic cross-sectional view taken along line II in FIG. 1A. [Figure 2A] FIG. 2A is a plan view schematically showing a first step of fabricating a stretchable device according to a first embodiment of the present invention. [Figure 2B] FIG. 2B is a schematic cross-sectional view taken along line II-II in FIG. 2A. [Figure 2C] FIG. 2C is a plan view schematically showing a second step of producing a stretchable device according to the first embodiment of the present invention. [Figure 2D] FIG. 2D is a schematic cross-sectional view taken along line III-III in FIG. 2C. [Figure 2E] FIG. 2E is a plan view schematically showing a third step of fabricating a stretchable device according to the first embodiment of the present invention. [Figure 2F] FIG. 2F is a schematic cross-sectional view taken along line IV-IV in FIG. 2E. [Figure 2G] FIG. 2G is a plan view schematically showing a fourth step of fabricating a stretchable device according to the first embodiment of the present invention. [Figure 2H] FIG. 2H is a schematic cross-sectional view taken along the line VV in FIG. 2G. [Figure 3]FIG. 3 is a plan view schematically showing a stretchable device according to a second embodiment of the present invention. [Figure 4] FIG. 4 is a plan view schematically showing a stretchable device according to a third embodiment of the present invention. [Figure 5] FIG. 5 is a plan view schematically showing a stretchable device according to a fourth embodiment of the present invention. [Figure 6A] FIG. 6A is a plan view schematically showing a stretchable device according to a fifth embodiment of the present invention. [Figure 6B] FIG. 6B is a schematic cross-sectional view taken along line VIB-VIB in FIG. 6A. [Figure 7A] FIG. 7A is a plan view schematically showing a stretchable device according to a fifth embodiment of the present invention. [Figure 7B] FIG. 7B is a schematic cross-sectional view taken along line VIIB-VIIB in FIG. 7A. [Figure 8] FIG. 8 is a schematic cross-sectional view showing a modification of FIG. 7B. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In each embodiment, differences from previous embodiments will be mainly described. In particular, similar effects resulting from similar configurations will not be mentioned in each embodiment. Among the components in the following embodiments, components not recited in independent claims will be described as optional components. Furthermore, the size and size ratios of components shown in the drawings are not necessarily strict. Furthermore, in each figure, substantially identical components are assigned the same reference numerals, and duplicated descriptions may be omitted or simplified.

[0010] [First embodiment] Hereinafter, the configuration of the stretchable device 100 according to the first embodiment will be described with reference to FIGS. 1A and 1B.

[0011] Fig. 1A is a plan view schematically showing a stretchable device according to a first embodiment of the present invention, and Fig. 1B is a schematic cross-sectional view taken along line II in Fig. 1A.

[0012] A stretchable device 100 according to a first embodiment of the present invention comprises a stretchable substrate 10, a first stretchable wiring 20 and a second stretchable wiring 30 that are provided on one main surface of the stretchable substrate 10 and face the first stretchable wiring 20 at a distance, and an electronic component 50 that is mounted so as to be electrically connectable to the first stretchable wiring 20 and the second stretchable wiring 30 via solder 40 (see FIGS. 1A and 1B). The stretchable device 100 may also have an adhesive layer on the other main surface of the stretchable substrate 10.

[0013] The components of the stretchable device 100 will be specifically described below, followed by a description of the characteristic parts of the first embodiment.

[0014] The stretchable substrate 10 is a sheet-like or film-like stretchable substrate, and is made of, for example, a stretchable resin material. Examples of resin materials for the stretchable substrate 10 include thermoplastic polyurethane (TPU), polyethylene (PE), polystyrene (PS), and polyethylene terephthalate (PET).

[0015] The thickness of the stretchable substrate 10 is not particularly limited, but is preferably 100 μm or less, more preferably 50 μm or less, from the viewpoint of not inhibiting the stretching of the surface of the living body when attached to the living body. In addition, the thickness of the stretchable substrate 10 is preferably 20 μm or more, from the viewpoint of ensuring a predetermined strength.

[0016] The first stretchable wiring 20 and the second stretchable wiring 30 are provided on the stretchable substrate 10, specifically on the main surface thereof.

[0017] In this specification, "above" includes a state of being above an element at a distance, i.e., being above an element via another object, a state of being above an element with a gap, and a state of being directly above an element.

[0018] Therefore, in this specification, "the first stretchable wiring 20 and the second stretchable wiring 30 arranged on the stretchable substrate 10" includes the first and second stretchable wiring 20, 30 in contact with the main surface of the stretchable substrate 10, and the first and second stretchable wiring 20, 30 in a state where they are separated from the main surface via another member (for example, a resin layer described below) without directly contacting the main surface of the stretchable substrate 10.

[0019] The resin layer may be made of at least one resin material selected from the group consisting of polyimide, epoxy, urethane, and acrylic resins, or may be made of an inorganic material such as alumina or silicon dioxide.

[0020] The first stretchable wire 20 and the second stretchable wire 30 each have connection parts 21, 31 that can be electrically connected to the electronic component 50, and extension parts 22, 32 (which may also be referred to as lead-out parts) that are continuous with the respective connection parts 21, 31. In this embodiment, the longitudinal directions of the extension parts 22, 32 of the stretchable wires 20, 30 extend in one direction. In this specification, the term "connection part" refers to a region that overlaps with the electronic component when viewed in the thickness direction of the stretchable substrate.

[0021] The first elastic wire 20 and the second elastic wire 30 each contain conductive particles and a resin. Examples of the elastic wires include a mixture of conductive particles such as metal powder of Ag, Cu, or Ni and an elastomer resin such as a silicone resin. The average particle size of the conductive particles is not particularly limited, but is preferably 0.01 μm or more and 10 μm or less. Furthermore, the conductive particles are preferably spherical.

[0022] The thickness of each stretchable wire is not particularly limited, but is preferably 100 μm or less, and more preferably 50 μm or less. The thickness of each stretchable wire is preferably 0.01 μm or more. The line width of each stretchable wire is not particularly limited, but is preferably 0.1 μm or more, and more preferably 1 mm or less. The shape of each stretchable wire is not particularly limited.

[0023] From the viewpoint of preventing short circuits when the stretchable device 100 is in use, it is preferable that the extension direction of the first stretchable wire 20 and the second stretchable wire 30 is the longitudinal direction of the stretchable device 100 (i.e., the stretching direction).

[0024] The electronic component 50 is disposed at a distance from the stretchable substrate 10 in the thickness direction X of the stretchable substrate 10. The electronic component 50 is not particularly limited, but examples thereof include a thermistor, a chip capacitor, and a chip coil. The electronic component 50 has a main body 51 and a first electrode portion 52 and a second electrode portion 53 that are provided on the main body 51 and face each other. The first electrode portion 52 is electrically connected to the connection portion 21 of the first stretchable wiring 20 via solder 40. The second electrode portion 53 is electrically connected to the connection portion 31 of the second stretchable wiring 30. The main body 51 of the electronic component 50 is non-stretchable.

[0025] The adhesive layer has adhesiveness that allows the stretchable device 100 to be attached to an adherend such as a living body. In one example, the adhesive layer can be positioned between the stretchable substrate 10 and an adherend such as a living body.

[0026] The adhesive layer has a first main surface facing the adherend, such as a living body, and a second main surface on the opposite side. It is preferable that the first adhesive layer has adhesiveness on both main surfaces. The first main surface of the adhesive layer can be attached to a living body, etc. Note that it is also possible for the first main surface of the adhesive layer itself to be attached to another layer, and then for another layer to be attached to the living body, etc. The second main surface of the adhesive layer can be attached to the stretchable substrate 10. Note that a protective layer may be further disposed between the second main surface of the adhesive layer and the stretchable substrate 10 to improve waterproofness, etc.

[0027] The adhesive layer can be made of any adhesive that is mild to the skin, has sufficient pressure-sensitive adhesiveness, and can be easily peeled off from the skin after use.

[0028] Although not particularly limited, the adhesive layer may be made of a pressure-sensitive adhesive or the like. The pressure-sensitive adhesive is not particularly limited as long as it is one that can be generally used by laminating it on the stretchable substrate 10. For example, rubber-based, acrylic-based, and silicone-based pressure-sensitive adhesives can be used. When a pressure-sensitive adhesive is used, it can be bonded to the mating member (stretchable substrate) at a relatively low temperature, so that deterioration and distortion of the stretchable substrate 10 due to excessive heat or UV energy can be prevented.

[0029] (Characteristic part of the first embodiment) Based on the details of the main components of the stretchable device 100 described above, the characteristic parts of the first embodiment will be described below.

[0030] The inventors of the present application have thoroughly investigated solutions for realizing stress relaxation between the elastic wiring 20, 30 and the mounted electronic component 50 during stretching, and as a result have come up with the idea of ​​using an elastic substrate 10 having a configuration different from conventional ones.

[0031] The first embodiment is characterized in that, when viewed from the thickness direction X of the stretchable substrate, at least the stretchable substrate 10 has discontinuous regions 11 arranged around the connection portions 21, 31. In this discontinuous region 11, the longitudinal portion thereof can extend along a direction parallel to at least the extension direction of the extending portions 21, 31 of the stretchable wirings 20, 30. The "parallel direction" here is not limited to a completely parallel direction, but means a completely parallel direction or a substantially or approximately parallel direction. In other words, the longitudinal portion of the discontinuous region 11 can extend along the longitudinal direction of the extending portions 21, 31 of the stretchable wirings 20, 30. That is, the longitudinal portion of the discontinuous region 11 can extend along the longitudinal direction of the stretchable wirings 20, 30.

[0032] As used herein, "discontinuous regions 11 arranged around the connection parts 21, 31 of the stretchable wirings 20, 30" refers to discontinuous regions 11 arranged at locations where the shortest distance between the discontinuous region 11 and the connection part of the stretchable wiring is 5% to 50% of the shortest distance between the outer edge of the stretchable substrate and the connection part. Furthermore, "discontinuous regions 11 arranged around the connection parts 21, 31 of the stretchable wirings 20, 30" refers to discontinuous regions 11 arranged at locations where the shortest distance between the discontinuous region 11 and the connection part can be two times or less the shortest distance between the discontinuous region 11 and the main body part 51.

[0033] According to this feature, it is possible to make it difficult for the stretching force caused by the stretchable substrate 10 to act at the discontinuous regions 11. That is, in this embodiment, the discontinuous regions 11 are positioned so as to mitigate the stretching force of the stretchable substrate 10 acting in a predetermined direction.

[0034] This makes it possible to mitigate stress that may occur between the stretchable wirings 20, 30 arranged on the stretchable substrate 10 and the electronic component 50 when the device 100 stretches and contracts, compared to when the discontinuous region 11 is not formed. That is, it is possible to suppress the action of stretching force on (the main body 51 of) the non-stretchable electronic component 50 mounted on the stretchable substrate 10. This makes it possible to suitably ensure the mounting reliability of the electronic component 50 even when the stretchable device stretches and contracts.

[0035] The discontinuous regions 11 may be through-holes that penetrate from one main surface to the other main surface of the stretchable substrate 10. The discontinuous regions 11 may also be in the form of grooves. When in the form of grooves, the discontinuous regions 11 may occupy 50% to 99% of the thickness of the stretchable substrate 10, preferably 60% to 99%, more preferably 70% to 99%, and even more preferably 80% to 99%.

[0036] From the viewpoint of suppressing re-adhesion due to the thermal load of the discontinuous region 11, the ratio of depth to width of the discontinuous region 11 may be 1:2. For example, the discontinuous region 11 may have a depth of 50 μm or more and a width of 100 μm or more. It is preferable that the width of the discontinuous region 11 is at least twice the depth.

[0037] Moreover, in this embodiment, the extending portions 22, 32 of the stretchable wirings 20, 30 extend in one direction, and the discontinuous region 11 is arranged on at least one side of the electronic component 50 in plan view. In one example, as shown in FIG. 1A , the discontinuous region 11 can be arranged on both sides of the electronic component 50. That is, the discontinuous region 11 can be arranged in a direction intersecting the extension direction of the extending portions 22, 32 of the stretchable wirings 20, 30.

[0038] A method for producing the stretchable device 100 of the first embodiment will be described below.

[0039] (Production process 1) Fig. 2A is a plan view schematically showing a first step of producing a stretchable device according to a first embodiment of the present invention, and Fig. 2B is a schematic cross-sectional view taken along line II-II in Fig. 2A.

[0040] In the manufacturing process 1, as shown in Figures 2A and 2B, first, a stretchable substrate 10 is prepared. This stretchable substrate 10 is subjected to cutting processing, taking into consideration the size, shape, and mounting location of the first and second stretchable wirings to be arranged later and the electronic components to be mounted. For example, a Pinnacle (registered trademark) blade can be used for the cutting processing.

[0041] Specifically, cutting is performed in the longitudinal direction of the stretchable substrate 10 and in the lateral direction perpendicular to the longitudinal direction, to form discontinuous regions 11 such that the longitudinal portions extend in the longitudinal direction of the stretchable substrate 10 and the lateral portions are continuous with the longitudinal portions and extend in the lateral direction of the stretchable substrate 10. In this step, two pairs of discontinuous regions 11 that are spaced apart and face each other in the lateral direction of the stretchable substrate 10 are prepared in the longitudinal direction of the stretchable substrate 10, forming a total of four discontinuous regions 11.

[0042] (Production process 2) Fig. 2C is a plan view schematically showing a second step of producing a stretchable device according to a first embodiment of the present invention, and Fig. 2D is a schematic cross-sectional view taken along line III-III in Fig. 2C.

[0043] 2C and 2D, in production step 2, first and second stretchable wires 20, 30 are prepared so that a portion that will later become a connection portion that can be electrically connected to an electronic component is located between two discontinuous regions 11 that are spaced apart in the short-side direction of the stretchable substrate 10. These stretchable wires 20, 30 can be formed by screen-printing a wiring material, followed by drying at about 100°C for a predetermined time in a drying step.

[0044] (Production process 3) Fig. 2E is a plan view schematically showing a third step of producing a stretchable device according to a first embodiment of the present invention, and Fig. 2F is a schematic cross-sectional view taken along line IV-IV in Fig. 2E.

[0045] 2E and 2F, solder paste 40α is positioned on the portions that will later become connection portions that can be electrically connected to electronic components. For example, a silver-based paste can be used as the solder paste.

[0046] (Production process 4) Fig. 2G is a plan view schematically showing a fourth step of fabricating a stretchable device according to a first embodiment of the present invention, and Fig. 2H is a schematic cross-sectional view taken along the line VV in Fig. 2G.

[0047] In manufacturing process 4, the first electrode portion 52 and the second electrode portion 53 of the electronic component 50 are positioned on each solder paste, and then soldering is performed in a reflow furnace for a predetermined time (e.g., 60 to 300 seconds) through preheating, main heating, and cooling processes. In the preheating process, the temperature is raised while volatilizing the solvent contained in the solder paste, and maintained at a constant temperature that easily activates the flux. In the main heating process, the temperature of the substrate and electronic component is raised uniformly until it reaches a temperature at which the solder melts.

[0048] In this way, the stretchable device 100 of the first embodiment can be produced.

[0049] [Second embodiment] The configuration of the stretchable device 100A according to the second embodiment will be described below with reference to Fig. 3. Fig. 3 is a plan view schematically showing the stretchable device according to the second embodiment of the present invention.

[0050] The second embodiment differs from the first embodiment in that the discontinuous region 11A formed in the stretchable substrate 10A is continuous from the periphery of the connection portion of the first stretchable wiring 20 to the periphery of the connection portion of the second stretchable wiring 30.

[0051] According to this continuous form, the stretching force of the stretchable substrate 10A acting in a predetermined direction can be more suitably alleviated in the discontinuous region 11A compared to the case of embodiment 1. This makes it possible to more suitably suppress the action of stretching force on (the main body portion 51 of) the non-stretchable electronic component 50 mounted on the stretchable substrate 10 compared to the discontinuous region 11 of embodiment 1 (wherein the discontinuous region 11 is not continuous from the periphery of the connection portion of the first stretchable wiring 20 to the periphery of the connection portion of the second stretchable wiring 30). As a result, it is possible to more suitably alleviate stress that may occur between the electronic component 50 and the stretchable wirings 20, 30 arranged on the stretchable substrate 10A when the device 100A stretches or contracts.

[0052] [Third embodiment] The configuration of a stretchable device 100B according to the third embodiment will be described below with reference to Fig. 4. Fig. 4 is a plan view schematically showing a stretchable device according to the third embodiment of the present invention.

[0053] The third embodiment differs from the first embodiment in that, when viewed in a plane, the discontinuous region 11B formed in the stretchable substrate 10B is arranged to completely surround the outer edge of the connection between the first stretchable wiring 20 and the second stretchable wiring 30 except for the installation location of the stretchable wiring.

[0054] According to the surrounding configuration of the discontinuous region 11B, the stretching force of the stretchable substrate 10B acting in a predetermined direction can be more suitably alleviated in the discontinuous region 11B compared to the case of embodiment 1. This makes it possible to more suitably suppress the action of the stretching force on (the main body 51 of) the non-stretchable electronic component 50 mounted on the stretchable substrate 10 compared to the discontinuous region 11 of embodiment 1. As a result, it is possible to more suitably alleviate stress that may occur between the stretchable wirings 20, 30 arranged on the stretchable substrate 10B and the electronic component 50 when the device 100B stretches or contracts.

[0055] [Fourth embodiment] The configuration of a stretchable device 100C according to the fourth embodiment will be described below with reference to Fig. 5. Fig. 5 is a plan view schematically showing a stretchable device according to the fourth embodiment of the present invention.

[0056] The fourth embodiment differs from the first embodiment in the shape of the extension portion of the elastic wire in plan view.

[0057] Specifically, as shown in Figure 5, in a planar view, in the fourth embodiment, the extension portion of the first elastic wiring 20C has a first extension region 22CI that is continuous with the connection portion 21C, and a second extension region 22CII that extends in a direction different from the first extension region 22CI.

[0058] Similarly, the extending portion of the second stretchable wire 30C has a first extending region 32CI that is continuous with the connecting portion 31C, and a second extending region 32CII that extends in a direction different from the first extending region 32CI. As an example, in this case, the extending portion of the stretchable wire can have a bent shape in a planar view.

[0059] According to this embodiment, as shown in the drawing, the discontinuous region 11C is arranged in the extension direction of the first extending regions 22CI, 32CI and the second extending regions 22CII, 32CII. Specifically, in a plan view, the discontinuous region 11C formed in the stretchable substrate 10C can be arranged so as to entirely surround the connection portion 21C of the first stretchable wire 20C and the connection portion 31C of the second stretchable wire 30C except for the installation locations of the stretchable wires.

[0060] According to the configuration of the discontinuous region 11C, compared to the first embodiment, even if the stretching force of the stretchable substrate 10C acts on the stretchable substrate 10C in the up-down and left-right directions in a plan view, the stretching force acting in each direction can be more suitably alleviated in the discontinuous region 11C. This makes it possible to more suitably suppress the action of the stretching force on (the main body 51 of) the non-stretchable electronic component 50 mounted on the stretchable substrate 10C. As a result, it is possible to more suitably alleviate stress that may occur between the stretchable wirings 20C, 30C and the electronic component 50 when the device 100C stretches.

[0061] Furthermore, in cross-sectional view, a protective layer may be provided between the stretchable substrate and the electronic component, or a covering layer may be provided to cover the stretchable substrate and the electronic component. In this case, from the viewpoint of suitably alleviating stress that may occur between the stretchable wiring and the electronic component during stretching, it is preferable that the discontinuous region extend continuously from the stretchable substrate to the above-mentioned protective layer and / or covering layer. However, in this case, the discontinuous region may be provided only in the stretchable substrate.

[0062] [Fifth embodiment] The configuration of a stretchable device 100D according to a fifth embodiment will be described below with reference to Fig. 6A and Fig. 6B. Fig. 6A is a plan view schematically showing a stretchable device according to a fifth embodiment of the present invention. Fig. 6B is a schematic cross-sectional view taken along line VIB-VIB in Fig. 6A.

[0063] The fifth embodiment differs from the first embodiment in that an adhesive layer 60X has a discontinuous region 70X. One main surface 61X of this adhesive layer 60X is attached to an elastic substrate 10X, and the other main surface 62X is configured to be attachable to a living body 200X (see FIGS. 6A and 6B).

[0064] With this configuration, even when the adhesive layer 60X is attached to a living body, it is possible to prevent minute expansion and contraction forces of the living body from acting on the stretchable substrate 10 via the adhesive layer 60X and then acting on the non-stretchable electronic component 50X. That is, it is possible to prevent the action of expansion and contraction forces on the non-stretchable electronic component 50X mounted on the stretchable substrate 10. This makes it possible to preferably ensure the mounting reliability of the electronic component 50X.

[0065] In particular, from the viewpoint of suitably suppressing the action of stretching force on the electronic component 50X, it is preferable that the discontinuous region 70X of the adhesive layer 60X is positioned in a portion that overlaps with the electronic component 50X when viewed from the thickness direction X of the stretchable substrate 10X. In other words, it is preferable that the electronic component 50X and the continuous region of the adhesive layer 60X do not overlap when viewed from the thickness direction X of the stretchable substrate 10X. Note that in the fifth embodiment, the living body 200X and the stretchable substrate 10X may be in partial contact with each other.

[0066] [Sixth embodiment] The configuration of a stretchable device 100E according to a sixth embodiment will be described below with reference to Fig. 7A and Fig. 7B. Fig. 7A is a plan view schematically showing a stretchable device according to the sixth embodiment of the present invention. Fig. 7B is a schematic cross-sectional view taken along line VIIB-VIIB in Fig. 7A.

[0067] The sixth embodiment differs from the fifth embodiment in that it further includes a sealing resin 80X that covers the electronic component 50X.

[0068] When the inner edge 62X of the continuous region 64X of the adhesive layer 60X is located inside the outer edge 81X of the sealing resin 80X, stress tends to concentrate at the interface between the stretchable portion and the non-stretchable portion of the stretchable device 100E. Note that the "inner side" here refers to the side where the shortest distance to the electronic component 50X is shorter, based on the position of the electronic component 50X. In other words, The side with the longer separation may correspond to the outside.

[0069] In view of this, it is preferable that the inner edge 62X of the continuous region 64X of the adhesive layer 60X be positioned outside the outer edge 81X of the sealing resin 80X, thereby making it possible to suitably prevent breakage of the components when the device 100E expands or contracts.

[0070] Note that, without being limited thereto, from the viewpoint of at least alleviating stress concentration at the interface between the stretchable portion and the non-stretchable portion of the stretchable device 100E, the inner edge 62X of the continuous region 64X of the adhesive layer 60X and the outer edge 81X of the sealing resin 80X may be on a coaxial line. Furthermore, in the sixth embodiment, similar to the fifth embodiment, the living body 200X and the stretchable substrate 10X may be in partial contact with each other.

[0071] [Seventh embodiment] The configuration of a stretchable device 100F according to the seventh embodiment will be described below with reference to Fig. 8. Fig. 8 is a schematic cross-sectional view showing a modification of Fig. 7B.

[0072] The seventh embodiment differs from the sixth embodiment in that the width of the discontinuous region 70X1 of the adhesive layer 60X is larger.

[0073] When the width of the discontinuous region 70X1 of the adhesive layer 60X is large, as shown in Fig. 8, even if the elongation on the living body 200X side differs from that in the region below the electronic component 50X, the action of the stretching force on the mounted non-stretchable electronic component 50X can be more suitably suppressed. This makes it possible to make the stretchable wirings 20X and 30X uniform on the mounting side of the electronic component 50X. Note that in the seventh embodiment, from the viewpoint of making the elongation of the stretchable wirings 20X and 30X uniform, it is preferable that the living body 200X and the stretchable substrate 10X do not come into contact even partially.

[0074] More specifically, the width of the discontinuous region 70X1 in cross section is at least twice the width of the electronic component 50X. Preferably, the width is at least three times as large as the width of electronic component 50X, and more preferably, the width is at least three times as large as the width of electronic component 50X. Furthermore, it is more preferable that the width of each of the regions that constitute discontinuous region 70X1 in thickness direction X of the substrate and that are located on both sides of electronic component 50 in cross-sectional view is at least the width of electronic component 50X.

[0075] Note that each embodiment and modification is an example, and the present invention is not limited to each embodiment and modification. Also, each drawing is an example of components, and does not limit the shape. Furthermore, partial substitution or combination of the configurations shown in different embodiments and modifications is possible.

[0076] The stretchable device according to one embodiment of the present invention may have the following features. <1> The device comprises a stretchable substrate, a stretchable wiring provided on one main surface of the stretchable substrate, an electronic component provided so as to be electrically connectable to the stretchable wiring, and an adhesive layer provided on the other main surface of the stretchable substrate, A stretchable device, wherein at least one of the stretchable substrate and the adhesive layer has discontinuous regions. <2> The elastic wiring includes a connection portion that can be electrically connected to the electronic component, When the stretchable substrate has the discontinuous region, the discontinuous region of the stretchable substrate is arranged around the connection portion when viewed in the thickness direction of the stretchable substrate. <1> 2. The stretchable device according to claim 1 . <3> The elastic wire has the connection portion and an extension portion continuous with the connection portion, and a longitudinal portion of the discontinuous region extends at least along a direction parallel to the extension direction of the extension portion of the elastic wire, <1> 2. The stretchable device according to claim 1 . <4> The electronic component has a main body portion and first and second electrode portions provided on the main body portion and facing each other, and at least the main body portion is non-stretchable. <1> ~ <3> 1. The stretchable device according to any one of the preceding claims. <5> The discontinuous region is a through hole. <1> ~ <4> 1. The stretchable device according to any one of the preceding claims. <6> The discontinuous region has a groove morphology. <1> ~ <4> 1. The stretchable device according to any one of the preceding claims. <7> The ratio of the depth to the width of the discontinuous region is 1:2. <1> ~ <6> 1. The stretchable device according to any one of the preceding claims. <8> The extension portion of the elastic wiring extends in one direction, and the discontinuous region is arranged in a direction intersecting the extension direction of the extension portion. <3> subordinate to <4> ~ <7> 1. The stretchable device according to any one of the preceding claims. <9> The extension portion of the elastic wiring has a first extension region that is continuous with the connection portion and a second extension region that extends in a direction different from the first extension region, the discontinuous region is arranged in the extension direction of the first extension region and the second extension region. <3> subordinate to <4> ~ <7> 1. The stretchable device according to any one of the preceding claims. <10> In a plan view, the discontinuous region is disposed on at least one side of the electronic component. <1> ~ <9> The stretchable device according to any one of the preceding claims. <11> The electronic component has a main body portion and first and second electrode portions provided on the main body portion and facing each other, the first electrode portion is electrically connected to a connection portion of the first stretchable wiring, the second electrode portion is electrically connected to a connection portion of the second stretchable wiring, and the discontinuous region is continuous from a periphery of the connection portion of the first stretchable wiring to a periphery of the connection portion of the second stretchable wiring, <1> ~ <10> The stretchable device according to any one of the preceding claims. <12> In a plan view, the discontinuous region is arranged so as to entirely surround the outer edge of the connection portion of the stretchable wiring. <1> ~ <11> 1. The stretchable device according to any one of the preceding claims. <13> The shortest distance between the discontinuous region and the connection portion of the stretchable wiring is 5% to 50% of the shortest distance between the outer edge of the stretchable substrate and the connection portion, <1> ~ <12> 1. The stretchable device according to any one of the preceding claims. <14> In a cross-sectional view, the stretchable substrate and the electronic component are spaced apart from each other, and a protective layer is provided between the stretchable substrate and the electronic component. <1> ~ <13> 1. The stretchable device according to any one of the preceding claims. <15> A covering layer is provided to cover the stretchable substrate and the electronic component in a cross-sectional view. <1> ~ <14> 1. The stretchable device according to any one of the preceding claims. <16> The discontinuous region extends continuously from the stretchable substrate to the protective layer and / or the covering layer. <14> or <15> 2. The stretchable device according to claim 1 . <17> The width of the discontinuous region is 100 μm or more. <1> ~ <16> 1. The stretchable device according to any one of the preceding claims. <18> The adhesive layer is capable of being attached to a living body, When the adhesive layer has the discontinuous region, the discontinuous region of the adhesive layer is positioned in a portion overlapping with the electronic component. <1> 2. The stretchable device according to claim 1 . <19> Further, a sealing resin is provided to cover the electronic component, an inner edge of the continuous region of the adhesive layer is located outside an outer edge of the sealing resin; <18> 2. The stretchable device according to claim 1 .

[0077] 100, 100A~100C Stretchable Device 10, 10A~10C elastic base material 11, 11A, 11B, 11C Non-contiguous area 20, 20C 1st elastic wiring 21, 21C: Connection portion of first elastic wiring 22 Extension portion of first elastic wiring 22CI First extension region of the extension portion of the first elastic wiring 22CII Second extension region of extension portion of first elastic wiring 30, 30C 2nd elastic wiring 31, 31C Second elastic wiring connection part 32 Extension portion of second elastic wiring 32CI First extension region of the extension portion of the second elastic wiring 32CII Second extension region of the extension portion of the second elastic wiring 40 solder 40α solder paste 50 Electronic Components 51 Main body 52, 53 1st electrode part, 2nd electrode part X: Thickness direction of the elastic substrate

Claims

1. The device comprises a stretchable substrate, a stretchable wiring provided on one main surface of the stretchable substrate, an electronic component provided so as to be electrically connectable to the stretchable wiring, and an adhesive layer provided on the other main surface of the stretchable substrate, At least one of the stretchable substrate and the adhesive layer has a discontinuous region, The elastic wiring includes a connection portion that can be electrically connected to the electronic component, A stretchable device, wherein when the stretchable substrate has the discontinuous region, the discontinuous region of the stretchable substrate is arranged around the connection portion when viewed in a thickness direction of the stretchable substrate.

2. The stretchable wiring has the connection portion and an extension portion continuous with the connection portion, and a longitudinal portion of the discontinuous region extends at least along a direction parallel to the extension direction of the extension portion of the stretchable wiring. The stretchable device according to claim 1.

3. The stretchable device according to claim 1, wherein the electronic component has a main body portion and first and second electrode portions provided on the main body portion and facing each other, and at least the main body portion is non-stretchable.

4. 10. The stretchable device of claim 1, wherein the discontinuous regions are through holes.

5. 10. The stretchable device of claim 1, wherein the discontinuous regions have a groove morphology.

6. 10. The stretchable device of claim 1, wherein the ratio of depth to width of the discontinuous regions is 1:

2.

7. The stretchable device according to claim 2, wherein the extension portion of the stretchable wiring extends in one direction, and the discontinuous region is arranged in a direction intersecting the extension direction of the extension portion.

8. The extension portion of the elastic wiring has a first extension region that is continuous with the connection portion and a second extension region that extends in a direction different from the first extension region, The stretchable device according to claim 2 , wherein the discontinuous region is disposed in an extension direction of the first extension region and the second extension region.

9. 10. The stretchable device of claim 1, wherein, in a plan view, the discontinuous region is disposed on at least one side of the electronic component.

10. The stretchable device according to claim 1, wherein the electronic component has a main body portion and first and second electrode portions provided on the main body portion and facing each other, the first electrode portion is electrically connected to a connection portion of a first of the stretchable wiring, the second electrode portion is electrically connected to a connection portion of a second of the stretchable wiring, and the discontinuous region is continuous from a periphery of the connection portion of the first of the stretchable wiring to a periphery of the connection portion of the second of the stretchable wiring.

11. The stretchable device according to claim 1 , wherein, in a plan view, the discontinuous region is arranged so as to entirely surround the outer edge of the connection portion of the stretchable wiring.

12. The stretchable device according to claim 1, wherein the shortest distance between the discontinuous region and the connection portion of the stretchable wiring is 5% to 50% of the shortest distance between the outer edge of the stretchable substrate and the connection portion.

13. The stretchable device according to claim 1, wherein the stretchable substrate and the electronic component are spaced apart from each other in a cross-sectional view, and a protective layer is provided between the stretchable substrate and the electronic component.

14. The stretchable device according to claim 1 , wherein a covering layer is provided to cover the stretchable substrate and the electronic component in a cross-sectional view.

15. 15. The stretchable device of claim 13 or 14, wherein the discontinuous region extends continuously from the stretchable substrate to the protective layer and / or the covering layer.

16. 10. The stretchable device of claim 1, wherein the width of the discontinuous region is 100 μm or greater.

17. The adhesive layer is capable of being attached to a living body, The stretchable device according to claim 1 , wherein when the adhesive layer has the discontinuous regions, the discontinuous regions of the adhesive layer are positioned in portions that overlap the electronic components.

18. Further, a sealing resin is provided to cover the electronic component, The stretchable device according to claim 17, wherein an inner edge of the continuous region of the adhesive layer is located outside an outer edge of the sealing resin.

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