Stretchable wiring board

Abstract

The invention provides a stretchable wiring board. The stretchable wiring board includes a stretchable base material, a stretchable wiring formed on the stretchable base material, an adhesive layer, and a film that is adhered to the stretchable base material via the adhesive layer and covers a portion of the stretchable wiring, the stretchable wiring including an extending portion extending from the film, and the adhesive layer is formed on the stretchable wiring. The adhesive layer includes a protruding portion that protrudes from an end portion of the film in a protruding direction of the protruding portion and covers a part of the protruding portion.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a stretchable wiring substrate. BACKGROUND

[0002] The stretchable wiring substrate disclosed in Japanese Patent Publication No. 2017-195230 has a stretchable base material, a stretchable wiring (described as a lead wiring portion and a stretchable wiring portion in the same document) formed on the stretchable base material, and a film (described as a reinforcing base material in the same document) pasted to the stretchable base material via an elastic body layer and covering a part of the stretchable wiring. Also, an end surface of the film is coplanar with an end surface of the elastic body layer. SUMMARY

[0003] However, from the viewpoint of suppressing deformation and breakage of the stretchable wiring, the stretchable wiring substrate described in Japanese Patent Publication No. 2017-195230 has room for improvement.

[0004] According to the present embodiment, a stretchable wiring substrate is provided, the stretchable wiring substrate including a stretchable base material, a stretchable wiring formed on the stretchable base material, an adhesive layer, and a film pasted to the stretchable base material via the adhesive layer, the film covering a part of the stretchable wiring, the stretchable wiring including a protruding portion protruding from an end portion of the film toward a protruding direction of the stretchable wiring, the adhesive layer including a protruding portion protruding from an end portion of the film toward a protruding direction of the protruding portion of the stretchable wiring and covering a part of the protruding portion.

[0005] According to the present embodiment, deformation and breakage of the stretchable wiring can be more reliably suppressed.

[0006] The stretchable wiring substrate of the present embodiment includes a stretchable base material, a stretchable wiring formed on the stretchable base material, an adhesive layer, and a film pasted to the stretchable base material via the adhesive layer, the film covering a part of the stretchable wiring, the stretchable wiring including a protruding portion protruding from an end portion of the film toward a protruding direction of the stretchable wiring, the adhesive layer including a protruding portion protruding from an end portion of the film toward a protruding direction of the protruding portion of the stretchable wiring and covering a part of the protruding portion. BRIEF DESCRIPTION OF DRAWINGS

[0007] Figure 1 is a schematic plan view showing the stretchable wiring substrate of the present embodiment. Figure 2 is a schematic rear view showing the stretchable wiring substrate of the present embodiment. Figure 3 is a schematic cross-sectional view taken along the line X-X shown in Figure 1 and Figure 2 is a schematic cut end surface along the line X-X shown in Figure 4is a schematic end view illustrating an example of a method of using the stretchable wiring substrate of the present embodiment. Figure 5 is Figure 3 is a partial enlarged view of A portion shown in FIG. 1. DETAILED DESCRIPTION In the following detailed description, for the purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the disclosed embodiments. Flowever, it will be apparent to one skilled in the art that one or more embodiments can be practiced without these specific details. In other instances, well-known structures and devices are schematically shown in order to simplify the drawing.

[0008] Hereinafter, the present embodiment will be described using Figures 1 to 5 The present embodiment will be described. In addition, the same reference numerals are applied to the same constituent elements throughout the drawings. Also, the description thereof will be appropriately omitted. Furthermore, Figures 3 to 5 A stretchable wiring substrate 100 is schematically illustrated. The thickness and size ratio of each constituent element of the stretchable wiring substrate 100 are not limited to the examples shown in the drawings.

[0009] As Figures 1 to 3 shown in FIG. 1, the stretchable wiring substrate 100 of the present embodiment includes a stretchable base material 10, a stretchable wiring 20 formed on the stretchable base material 10, and a film 31. The film 31 is attached to the stretchable base material 10 via an adhesive layer 33, and covers a part of the stretchable wiring 20. Specifically, the stretchable wiring 20 includes a protruding portion 26 protruding from the film 31. The protruding portion 26 includes an exposed portion 25 exposed from the adhesive layer 33. The adhesive layer 33 includes a protruding portion 35 protruding from an end portion 32 of the film 31 toward a protruding direction of the protruding portion 26. The protruding portion 35 covers a part of the protruding portion 26.

[0010] According to this embodiment, the film 31 is adhered to the stretchable substrate 10 via an adhesive layer 33. The adhesive layer 33 is sandwiched between the film 31 and the stretchable wiring 20. Furthermore, the protrusion 35 of the adhesive layer 33 covers a portion of the extension 26 of the stretchable wiring 20. That is, the adhesive layer 33 is configured from the portion 27 directly below the film 31 in the stretchable wiring 20 to the extension 26 of the stretchable wiring 20 (crossing the boundary between the portion 27 directly below the film and the extension 26). With this structure, even when an external force is applied to the stretchable wiring substrate 100 in its thickness direction (e.g., during stamping during manufacturing), the adhesive layer 33 between the end 32 of the film 31 and the stretchable wiring 20 functions as a buffer layer. Therefore, stress concentration at and around the boundary between the portion 27 directly below the film 31 and the extension 26 in the stretchable wiring 20 can be suppressed. Furthermore, deformation and breakage of the stretchable wiring 20 originating from this boundary can be suppressed. Thus, according to this embodiment, deformation (e.g., reduction in local thickness of the flexible wiring 20) and breakage can be suppressed more reliably.

[0011] The flexible wiring substrate 100 is used to adhere to the surface of an object. In this embodiment, the flexible wiring substrate 100 is adhered to the skin surface 300 of a desired location on a human body (see reference). Figure 4 The skin surface 300 is a soft, curved surface with unevenness. Furthermore, the skin surface 300 deforms (e.g., stretches) with the contraction and relaxation of muscles or the bending of joints. From the viewpoint of achieving adhesion to the skin surface 300, the stretchable substrate 10 is a sheet of film having two main surfaces (one surface 10a and the other surface 10b). When the stretchable wiring substrate 100 is adhered to the skin surface 300, the stretchable substrate 10 stretches and bends in accordance with the unevenness and deformation of the skin surface 300. Furthermore, the stretchable wiring 20, which is stretchable, also deforms with the stretching and bending of the stretchable substrate 10. In addition, the stretchable wiring substrate 100 is not limited to use on the skin surface 300; for example, it can also be adhered to the nails of living organisms, clothing, robots, various devices, apparatuses, or wearable products. Figure 1 This shows the scalable wiring substrate 100 as viewed from one side 10a. Figure 2 This shows the scalable wiring substrate 100 as viewed from the other side 10b.

[0012] The flexible wiring board 100 is connected to the device 200 for use. The flexible wiring board 100 can be used to transmit electrical signals applied from the device 200 to the skin surface 300 of a living organism. Alternatively, the flexible wiring board 100 can be used to acquire biological signals from the skin surface 300 of a living organism via the device 200. More specifically, the device 200 can be, for example, a biosensor that detects weak biological signals such as brain waves, electromyography (EMG), or electrocardiogram (ECG). These biological signals provide biological information such as electrocardiogram, heart rate, blood pressure, or body temperature. Alternatively, the device 200 can be a device that applies electrical stimulation (EMS) to the muscles of a living organism or a strain sensor that detects the movements (joint movements or angles) of a living organism. The device 200, for example, includes a main body 210 and a pair of connection terminals 220 connected to the flexible wiring board 100. Furthermore, Figure 4 The shape of device 200 is schematically shown. Furthermore, Figure 3 and Figure 4 It means equivalent to Figure 1 and Figure 2 The cut surface of the flexible wiring board 100 at the location of the XX line. In addition, in this embodiment, the flexible wiring board 100 can also be used with devices other than the power supply, control board or monitor.

[0013] Hereinafter, for example, in the description of the positional relationship between the various components of the flexible wiring board 100, Figure 3 The upper side is referred to as the upper side or above. Furthermore, the opposite side is referred to as the lower side or below. Additionally, one side of the long side of the stretchable substrate 10 is referred to as the left side or left-hand side. Furthermore, the opposite direction is referred to as the right side or right-hand side. However, these directions are specified for ease of explanation. This specification does not limit the orientation of the stretchable wiring substrate 100 during manufacturing or use.

[0014] like Figure 4As shown, the stretchable wiring substrate 100 has a double access configuration (double exposure configuration) as an example. This configuration has an electrode (in the case of the present embodiment, the first exposed electrode 51 described later) exposed toward the device 200 and an electrode (in the case of the present embodiment, the second exposed electrode 55 described later) exposed toward the object (in the case of the present embodiment, the skin surface 300 of a living body). In more detail, a part of the portion 27 directly below the film 31 in the stretchable wiring 20 is exposed to the other face 10b of the stretchable base material 10 via the opening 15 formed in the stretchable base material 10. Thereby, the first exposed electrode 51 is constituted. The exposed portion 25 of the stretchable wiring 20 is exposed from the adhesive layer 33 and the film 31 toward the direction opposite to the stretchable base material 10. Thereby, the second exposed electrode 55 is constituted. In the case of the present embodiment, at least the portions of the stretchable wiring 20 constituting the first exposed electrode 51 and the second exposed electrode 55 have a single film configuration. However, the present embodiment is not limited to this example. For example, the first exposed electrode 51 and the second exposed electrode 55 can be constituted by different wirings (layers) or different members from each other.

[0015] The stretchable base material 10 is a sheet of a thin film capable of stretching and contracting in at least one of the in-plane directions. The stretchability of the stretchable base material 10 in the in-plane directions can be isotropic or anisotropic. When the stretchability in the in-plane directions is anisotropic, the stretchability in the plurality of directions in the in-plane directions is different from each other. In addition, the stretchability of the stretchable base material 10 in the in-plane directions referred to here means the property that the base material is elongated according to the tension applied to the stretchable base material 10 and the base material is contracted according to the compression force applied to the stretchable base material 10. In the present embodiment, the change in the size shape due to the elongation of the stretchable base material 10 is larger than the change in the size shape due to the contraction of the stretchable base material 10. As shown in FIG. 1, the stretchable base material 10 is elongated in the direction of the arrow A1 and contracted in the direction of the arrow A2. Figure 1 Figure 2 As shown, the stretchable base material 10 has a substantially elliptical shape having a major axis in one direction, for example, in plan view. However, in the present embodiment, the planar shape of the stretchable base material 10 is not particularly limited. The planar shape can be appropriately set according to the use of the stretchable wiring substrate 100 or the adherend.

[0016] ​The stretchable base material 10 preferably contains a thermoplastic resin that exhibits softening and coatability in a desired temperature range (for example, 80°C or higher and 150°C or lower). The material constituting the stretchable base material 10 is not particularly limited. As examples of such a material, elastomer materials including nitrile rubber, latex rubber, and polyurethane-based elastomers can be given. In particular, a polyurethane-based elastomer sheet for medical use can be used. Thereby, even in a case where the base material is attached to the skin surface 300 of a human body, high safety can be ensured. In the present embodiment, the stretchable base material 10 has, for example, an elastomer monolayer configuration that does not have another layer such as an adhesive layer on its surface.

[0017] The thickness dimension of the stretchable base material 10 is not particularly limited. From the viewpoint of not obstructing the stretching action of the skin surface 300, the preferable thickness dimension is, for example, 50 μm or less. The more preferable thickness dimension is, for example, 5 μm or less. By thus setting the thickness dimension, the wearing feeling of the stretchable wiring substrate 100 is improved. Also, the temporary presence of the adhesive trace of the stretchable base material 10 on the skin surface 300 at the time of peeling the used stretchable wiring substrate 100 from the skin surface 300 can be suppressed. Furthermore, the stretchable base material 10 is reinforced by the film 31, the conductive adhesive layer 61 described later, and the release film 65. Therefore, even in a case where the thickness dimension of the stretchable base material 10 is set to 5 μm or less, the stretchable base material 10 of the stretchable wiring substrate 100 before being attached to the skin surface 300 can maintain a state in which its main surface is spread in the surface direction thereof.

[0018] The maximum elongation of the stretchable base material 10 is preferably 10% or more, more preferably 50% or more, further preferably 100% or more, and particularly preferably 200% or more. The stretchable base material 10 configured as described above can exhibit, for example, a maximum elongation of 300% or more. Here, the maximum elongation of the stretchable base material 10 refers to the maximum value among the elongations of the elastic deformation in one direction in the surface direction. In the present embodiment, the elongation refers to the proportion of the increased dimension of the base material elongated in one direction in the surface direction due to the applied force, with respect to the dimension of the base material to which no external force is applied (0% elongation dimension). For example, if the elongation is 50%, the base material is elongated to 1.5 times the 0% elongation dimension. If the elongation is 100%, the base material is elongated to twice the 0% elongation dimension.

[0019] The stretchable wiring 20 has conductivity. Therefore, the stretchable wiring 20 can transmit an electric signal or an electric current. In the present embodiment, the stretchable wiring 20 can also be configured to function as an antenna in part thereof, for example. In this case, the signal received by the antenna is transmitted to an external device (not shown). As described above, the stretchable wiring 20 can be used as an antenna. Therefore, the stretchable wiring substrate 100 can be used as a wearable device such as a smart watch or a smart band. Figure 1 and Figure 2In the present embodiment, the stretchable wiring substrate 100 has a plurality of stretchable wirings 20. To be more specific, the stretchable wiring substrate 100 has, for example, a first stretchable wiring 21 and a second stretchable wiring 22 as the plurality of stretchable wirings 20. The first stretchable wiring 21 and the second stretchable wiring 22 each have, for example, a single-film configuration. The first stretchable wiring 21 and the second stretchable wiring 22 are arranged at different planar positions. The stretchable wirings 20 constitute the first exposed electrode 51 and the second exposed electrode 55. To be more specific, the first stretchable wiring 21 constitutes the first exposed electrode 51a and the second exposed electrode 55a described later. The second stretchable wiring 22 constitutes the first exposed electrode 51b and the second exposed electrode 55b described later. In the present embodiment, the first stretchable wiring 21 is arranged at one end portion (left end portion) in the longitudinal direction of the stretchable substrate 10. The second stretchable wiring 22 is arranged at the other end portion (right end portion) in the longitudinal direction of the stretchable substrate 10. Further, the first stretchable wiring 21 and the second stretchable wiring 22 are arranged in the same plane. The first stretchable wiring 21 and the second stretchable wiring 22 are formed, for example, in a symmetrical shape with the center in the longitudinal direction of the stretchable substrate 10 as a reference. The longitudinal direction of each of the first stretchable wiring 21 and the second stretchable wiring 22 is along the longitudinal direction (left-right direction) of the stretchable substrate 10. The first stretchable wiring 21 includes, for example, a main body portion 21a and a protruding portion 21b. The protruding portion 21b protrudes toward the second stretchable wiring 22 from the main body portion 21a. The main body portion 21a has, for example, a substantially elliptical shape with a major axis along the longitudinal direction (left-right direction) of the stretchable substrate 10 when viewed from above. The protruding portion 21b extends in a substantially straight line from one end portion of the main body portion 21a in the direction of the major axis. Similarly, the second stretchable wiring 22 includes, for example, a main body portion 22a having a substantially elliptical shape when viewed from above and a protruding portion 22b. The protruding portion 22b protrudes toward the first stretchable wiring 21 from the main body portion 22a. The protruding portion 22b of the second stretchable wiring 22 is arranged on an extension line from the protruding portion 21b of the first stretchable wiring 21. Note that the planar shape and positional relationship of the stretchable wirings 20 are not limited to the above-described example. These planar shapes and positional relationships can be appropriately set according to the size and use of the stretchable wiring substrate 100. Further, the first stretchable wiring 21 and the second stretchable wiring 22 can also be formed in different shapes from each other, for example.

[0020] In the case of the present embodiment, the stretchable wiring 20 (the first stretchable wiring 21 and the second stretchable wiring 22) is, for example, a coating film including a conductive filler and a binder. The binder contains a thermoplastic resin. The conductive filler is composed of, for example, silver, gold, platinum, carbon, copper, aluminum, cobalt, or nickel, or an alloy thereof. It is preferable that the thermoplastic resin exhibit softening and melt coating properties in a temperature range desired (for example, 80°C or higher and 150°C or lower). As such a thermoplastic resin, a thermoplastic elastomer material including a polyurethane resin, an acrylic resin, and a silicone rubber can be given. Further, as the thermoplastic resin, it is preferable to select a resin having a low Young's modulus. Thereby, it is possible to set the modulus of elasticity of the stretchable wiring 20, which is coated with a stretchable coating film, to be equal to or smaller than that of the stretchable substrate 10. One elastomer material can be used alone. Alternatively, a plurality of elastomer materials can be used in mixture. Further, the method of forming the stretchable wiring 20 is not particularly limited. For example, the stretchable wiring 20 can be formed by a printing method. The printing method is not particularly limited. As examples of the printing method, a screen printing method, an inkjet printing method, a gravure printing method, and an offset printing method can be given. The thickness of the stretchable wiring 20 is not particularly limited. The thickness is preferably set to be 5 μm or more, and more preferably set to be about 20 μm.

[0021] The modulus of elasticity of the stretchable wiring 20 is, for example, equal to or lower than that of the stretchable substrate 10, and is 1 MPa or lower. In more detail, the modulus of elasticity of the stretchable wiring 20 is, for example, preferably 1 kPa or more and 50 kPa or lower, and more preferably 1 kPa or more and 10 kPa or lower. In the case of the present embodiment, the modulus of elasticity of the stretchable wiring 20 is, for example, 1 kPa or more and 10 kPa or lower. Further, the viscosity of the stretchable wiring 20 before heat treatment (in the state of a conductive paste) is, for example, preferably 50 dPa s or more, and more preferably 100 dPa s or more. Note that the viscosity here is defined as a value measured at 25°C using a cone-plate type viscometer.

[0022] Here, as described above, a part of the stretchable wiring 20 is exposed toward the other face 10b of the stretchable substrate 10 via the opening 15 formed in the stretchable substrate 10. Thereby, the first exposed electrode 51 is constituted. As Figure 4As shown, the first exposed electrode 51 is connected to the connection terminal 220 of the device 200 via the opening 15 formed in the stretchable substrate 10. In more detail, the opening 15 includes a first opening 15a and a second opening 15b in the stretchable substrate 10. The first opening 15a is formed at a position of the front end portion corresponding to the protruding portion 21b of the first stretchable wiring 21. The second opening 15b is formed at a position of the front end portion corresponding to the protruding portion 22b of the second stretchable wiring 22. The first opening 15a and the second opening 15b are formed at the central portion in the longitudinal direction of the stretchable substrate 10, respectively. Also, a part of the stretchable wiring 20 is exposed toward the other face 10b (in the case of the present embodiment, the lower face in the stretchable substrate 10) via the first opening 15a. Thereby, the first exposed electrode 51a is constituted. Similarly, a part of the stretchable wiring 20 is exposed toward the other face 10b (in the case of the present embodiment, the lower face in the stretchable substrate 10) via the second opening 15b. Thereby, the first exposed electrode 51b is constituted. The first exposed electrode 51a (the protruding portion 21b) of the first stretchable wiring 21 is electrically and mechanically connected to the one connection terminal 220 of the device 200 via the first opening 15a. The first exposed electrode 51b of the second stretchable wiring 22 is electrically and mechanically connected to the other connection terminal 220 of the device 200 via the second opening 15b. Figure 3 Figure 3 As shown, the first exposed electrode 51 is connected to the connection terminal 220 of the device 200 via the opening 15 formed in the stretchable substrate 10. In more detail, the opening 15 includes a first opening 15a and a second opening 15b in the stretchable substrate 10. The first opening 15a is formed at a position of the front end portion corresponding to the protruding portion 21b of the first stretchable wiring 21. The second opening 15b is formed at a position of the front end portion corresponding to the protruding portion 22b of the second stretchable wiring 22. The first opening 15a and the second opening 15b are formed at the central portion in the longitudinal direction of the stretchable substrate 10, respectively. Also, a part of the stretchable wiring 20 is exposed toward the other face 10b (in the case of the present embodiment, the lower face in the stretchable substrate 10) via the first opening 15a. Thereby, the first exposed electrode 51a is constituted. Similarly, a part of the stretchable wiring 20 is exposed toward the other face 10b (in the case of the present embodiment, the lower face in the stretchable substrate 10) via the second opening 15b. Thereby, the first exposed electrode 51b is constituted. The first exposed electrode 51a (the protruding portion 21b) of the first stretchable wiring 21 is electrically and mechanically connected to the one connection terminal 220 of the device 200 via the first opening 15a. The first exposed electrode 51b of the second stretchable wiring 22 is electrically and mechanically connected to the other connection terminal 220 of the device 200 via the second opening 15b.

[0023] As Figures 1 to 3 ​As shown, the film 31 is attached to the stretchable base material 10 and the stretchable wiring 20 by the adhesive layer 33. The film 31 is formed in a film shape (thin film shape), a plate shape, or a sheet shape. In plan view, the film 31 covers the central portion in the longitudinal direction of the stretchable base material 10. The planar shape of the film 31 is not particularly limited. In the present embodiment, as an example, the film 31 is formed so as to have a substantially square planar shape. The film 31 is a member having flexibility, and has a Young's modulus greater than that of the stretchable base material 10. The material of the film 31 is not particularly limited. As examples of materials that can be used, synthetic resins having low slidability, corrosion resistance, and high strength, including polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyimide (PI), polyphenylene sulfide (PPS), and a fluororesin, can be given. Furthermore, as the film 31, a paper raw material having a corresponding durability, such as a cellulose nanofiber paper or a thick paper, can be used, for example. Furthermore, the rigidity of the film 31 is higher than the rigidity of the stretchable base material 10 and the rigidity of the stretchable wiring 20. In addition, the rigidity of the film 31 refers to the product (E-I) of the Young's modulus (E) and the cross-sectional moment of inertia (I). Furthermore, "high rigidity" refers to at least either high bending rigidity or high tensile rigidity. Here, "high bending rigidity" refers to the fact that the film is difficult to deform with respect to a bending load in a direction intersecting the surface direction thereof. Furthermore, "high tensile rigidity" refers to the fact that the film is difficult to deform with respect to a tensile stress in the in-plane direction thereof. It is preferable that the film 31 have both of these "high rigidity". The thickness dimension of the film 31 is not particularly limited. The preferable thickness is 10 μm or more and 500 μm or less. The more preferable thickness is 20 μm or more and 300 μm or less.

[0024] Here, as described above, the film 31 is attached to the stretchable base material 10 via the adhesive layer 33 so as to cover a portion of the stretchable wiring 20. The adhesive layer 33 protrudes from the film 31 toward the direction in which the stretchable wiring 20 protrudes from the end portion of the film 31. This protruding portion (protruding portion 35) covers a portion of the protruding portion 26 (the portion of the stretchable wiring 20 that protrudes from the film 31).

[0025] More specifically, the adhesive layer 33 and the film 31 are disposed so as to span the gap between the first stretchable wiring 21 and the second stretchable wiring 22. Thereby, each of the first exposed electrodes 51a, 51b can be favorably reinforced by the film 31. Furthermore, the pitch of the first exposed electrodes 51a, 51b from each other can be ensured.

[0026] More specifically, as Figure 3As shown, a portion of the first stretchable wire 21 constitutes a first protruding portion 26a that protrudes to the left from the left end of the film 31. A portion of the second stretchable wire 22 constitutes a second protruding portion 26b that protrudes to the right from the right end of the film 31. The left end portion of the adhesive layer 33 is disposed to the first protruding portion 26a of the first stretchable wire 21 from the portion 27a directly below the film 31 in the first stretchable wire 21 (across the boundary of the portion 27a directly below the film and the first protruding portion 26a). Likewise, the right end portion of the adhesive layer 33 is disposed to the second protruding portion 26b of the second stretchable wire 22 from the portion 27b directly below the film 31 in the second stretchable wire 22 (across the boundary of the portion 27b directly below the film and the second protruding portion 26b). The left end portion of the adhesive layer 33 is directly attached to the surface (upper surface) of the first stretchable wire 21. The right end portion of the adhesive layer 33 is directly attached to the surface (upper surface) of the second stretchable wire 22. The left end portion of the adhesive layer 33 is directly attached to the surface (upper surface) of the protruding portion 21b of the first stretchable wire 21 and a portion of the main body portion 21a. The right end portion of the adhesive layer 33 is directly attached to the surface (upper surface) of the protruding portion 22b of the second stretchable wire 22 and a portion of the main body portion 22a. Further, the left end portion of the adhesive layer 33 protrudes from the film 31 to the left from the left end of the film 31. This protruding portion (first protruding portion 35a) covers a portion of the first protruding portion 26a of the first stretchable wire 21. The right end portion of the adhesive layer 33 protrudes from the film 31 to the right from the right end of the film 31. This protruding portion (second protruding portion 35b) covers a portion of the second protruding portion 26b of the second stretchable wire 22. According to such a structure, in each of the first stretchable wire 21 and the second stretchable wire 22, deformation and breakage of the stretchable wire 20 can be more reliably suppressed. In the present embodiment, the formation site of the protruding portion 35 of the adhesive layer 33 is not limited to the above-described example. As long as the protruding portion 35 is formed in a manner that covers at least a portion of the protruding portion 26 of the stretchable wire 20 (the portion of the stretchable wire 20 that protrudes from the film 31), it is acceptable. That is, as long as the adhesive layer 33 is disposed to at least a portion of the protruding portion 26 of the stretchable wire 20 (across the boundary of the portion 27 directly below the film 31 and the protruding portion 26), it is acceptable. Therefore, for example, in a case where the stretchable wire 20 protrudes in a loop shape from the outer shape line of the film 31 as viewed in plan, the protruding portion 35 of the adhesive layer 33 that covers the protruding portion 26 can also be formed in a loop shape around the outer periphery of the film 31.

[0027] The protruding length LI of the adhesive layer 33 from the end portion 32 of the film 31 (refer to Figure 1For example, the length is 0.5 mm or more. With this structure, contact between the end 32 of the film 31 and the stretchable wiring 20 can be more reliably suppressed. Therefore, deformation and breakage of the stretchable wiring 20 originating from the boundary between the portion 27 directly below the film 31 and the protrusion 26 can be suppressed. More specifically, the preferred length dimension (dimension in the left-right direction) of the first protrusion 35a is, for example, 0.5 mm or more. A more preferred length dimension is, for example, 1.0 mm or more. Similarly, the preferred length dimension (dimension in the left-right direction) of the second protrusion 35b is, for example, 0.5 mm or more. A more preferred length dimension is, for example, 1.0 mm or more. With this structure, when an external force in the thickness direction is applied to the stretchable wiring substrate 100, contact between the left and right ends of the film 31 and the stretchable wiring 20 (the first stretchable wiring 21 and the second stretchable wiring 22) can be more reliably suppressed. Furthermore, in this embodiment, as an example, the length dimension of the first protrusion 35a and the length dimension of the second protrusion 35b are approximately equal. However, this embodiment is not limited to this example. The length dimension of the first protrusion 35a may also be different from the length dimension of the second protrusion 35b. With such a structure, it is also possible to more reliably suppress the end 32 of the film 31 from contacting the stretchable wiring 20 when an external force in its thickness direction is applied to the stretchable wiring substrate 100.

[0028] like Figure 1 and Figure 2 As shown, the planar shapes of the adhesive layer 33 and the film 31 are not particularly limited. In this embodiment, as an example, the planar shapes of the adhesive layer 33 and the film 31 are approximately rectangular. The width dimension of the adhesive layer 33 (the dimension in the short side direction of the elastic substrate 10) is, for example, set to be equal to the width dimension of the film 31 (same as above). Furthermore, in this embodiment, the length dimension of the adhesive layer 33 is greater than the length dimension of the film 31 in the long side direction (left-right direction) of the elastic substrate 10. More specifically, in the long side direction (left-right direction) of the elastic substrate 10, the length dimension of the adhesive layer 33 is at least 1.1 times and less than 3 times the length dimension of the film 31, more preferably at least 1.2 times and less than 2 times the length dimension of the film 31. With this structure, when the film 31 is aligned with the adhesive layer 33, the length dimension of the protrusion 35 of the adhesive layer 33 can be easily ensured. Figure 1 and Figure 2 As shown, in top view, the membrane 31 is disposed in the central portion of the adhesive layer 33. The entire membrane 31 is housed inside the outline of the adhesive layer 33. However, this embodiment is not limited to this example. For example, the adhesive layer 33 may also be partially disposed between the end 32 of the membrane 31 and its vicinity and the stretchable wiring 20.

[0029] Furthermore, in the case of this embodiment, such asFigure 5 As shown, the adhesive layer 33 covers a part of the end surface 32a of the end portion 32 of the film 31. According to such a structure, displacement of the end surface 32a of the film 31 in the protruding direction of the adhesive layer 33 (in the case of the present embodiment, the lateral direction) with respect to the adhesive layer 33 can be suppressed. Therefore, movement of the film 31 in the direction of the stretchable wiring 20 (in the case of the present embodiment, the downward direction in FIG. 1) can also be suppressed. Furthermore, formation of a step at the boundary between the adhesive layer 33 and the end portion 32 of the film 31 can be suppressed. Thus, for example, as shown in FIG. 1, interference of the boundary between the adhesive layer 33 and the end portion 32 of the film 31 with the skin surface 300 when the stretchable wiring substrate 100 is arranged along the skin surface 300 can be suppressed. As a result, a good feeling of wearing the stretchable wiring substrate 100 can be obtained. Figure 3 As shown, the adhesive layer 33 covers a part of the end surface 32a of the end portion 32 of the film 31. According to such a structure, displacement of the end surface 32a of the film 31 in the protruding direction of the adhesive layer 33 (in the case of the present embodiment, the lateral direction) with respect to the adhesive layer 33 can be suppressed. Therefore, movement of the film 31 in the direction of the stretchable wiring 20 (in the case of the present embodiment, the downward direction in FIG. 1) can also be suppressed. Furthermore, formation of a step at the boundary between the adhesive layer 33 and the end portion 32 of the film 31 can be suppressed. Thus, for example, as shown in FIG. 1, interference of the boundary between the adhesive layer 33 and the end portion 32 of the film 31 with the skin surface 300 when the stretchable wiring substrate 100 is arranged along the skin surface 300 can be suppressed. As a result, a good feeling of wearing the stretchable wiring substrate 100 can be obtained. Figure 4 As shown, the adhesive layer 33 covers a part of the end surface 32a of the end portion 32 of the film 31. According to such a structure, displacement of the end surface 32a of the film 31 in the protruding direction of the adhesive layer 33 (in the case of the present embodiment, the lateral direction) with respect to the adhesive layer 33 can be suppressed. Therefore, movement of the film 31 in the direction of the stretchable wiring 20 (in the case of the present embodiment, the downward direction in FIG. 1) can also be suppressed. Furthermore, formation of a step at the boundary between the adhesive layer 33 and the end portion 32 of the film 31 can be suppressed. Thus, for example, as shown in FIG. 1, interference of the boundary between the adhesive layer 33 and the end portion 32 of the film 31 with the skin surface 300 when the stretchable wiring substrate 100 is arranged along the skin surface 300 can be suppressed. As a result, a good feeling of wearing the stretchable wiring substrate 100 can be obtained.

[0030] As shown, the adhesive layer 33 covers a part of the end surface 32a of the end portion 32 of the film 31. According to such a structure, displacement of the end surface 32a of the film 31 in the protruding direction of the adhesive layer 33 (in the case of the present embodiment, the lateral direction) with respect to the adhesive layer 33 can be suppressed. Therefore, movement of the film 31 in the direction of the stretchable wiring 20 (in the case of the present embodiment, the downward direction in FIG. 1) can also be suppressed. Furthermore, formation of a step at the boundary between the adhesive layer 33 and the end portion 32 of the film 31 can be suppressed. Thus, for example, as shown in FIG. 1, interference of the boundary between the adhesive layer 33 and the end portion 32 of the film 31 with the skin surface 300 when the stretchable wiring substrate 100 is arranged along the skin surface 300 can be suppressed. As a result, a good feeling of wearing the stretchable wiring substrate 100 can be obtained. Figure 5 As shown, the adhesive layer 33 covers a part of the end surface 32a of the end portion 32 of the film 31. According to such a structure, displacement of the end surface 32a of the film 31 in the protruding direction of the adhesive layer 33 (in the case of the present embodiment, the lateral direction) with respect to the adhesive layer 33 can be suppressed. Therefore, movement of the film 31 in the direction of the stretchable wiring 20 (in the case of the present embodiment, the downward direction in FIG. 1) can also be suppressed. Furthermore, formation of a step at the boundary between the adhesive layer 33 and the end portion 32 of the film 31 can be suppressed. Thus, for example, as shown in FIG. 1, interference of the boundary between the adhesive layer 33 and the end portion 32 of the film 31 with the skin surface 300 when the stretchable wiring substrate 100 is arranged along the skin surface 300 can be suppressed. As a result, a good feeling of wearing the stretchable wiring substrate 100 can be obtained. Figure 5 As shown, the adhesive layer 33 covers a part of the end surface 32a of the end portion 32 of the film 31. According to such a structure, displacement of the end surface 32a of the film 31 in the protruding direction of the adhesive layer 33 (in the case of the present embodiment, the lateral direction) with respect to the adhesive layer 33 can be suppressed. Therefore, movement of the film 31 in the direction of the stretchable wiring 20 (in the case of the present embodiment, the downward direction in FIG. 1) can also be suppressed. Furthermore, formation of a step at the boundary between the adhesive layer 33 and the end portion 32 of the film 31 can be suppressed. Thus, for example, as shown in FIG. 1, interference of the boundary between the adhesive layer 33 and the end portion 32 of the film 31 with the skin surface 300 when the stretchable wiring substrate 100 is arranged along the skin surface 300 can be suppressed. As a result, a good feeling of wearing the stretchable wiring substrate 100 can be obtained. Figures 3 to 4 As shown, the adhesive layer 33 covers a part of the end surface 32a of the end portion 32 of the film 31. According to such a structure, displacement of the end surface 32a of the film 31 in the protruding direction of the adhesive layer 33 (in the case of the present embodiment, the lateral direction) with respect to the adhesive layer 33 can be suppressed. Therefore, movement of the film 31 in the direction of the stretchable wiring 20 (in the case of the present embodiment, the downward direction in FIG. 1) can also be suppressed. Furthermore, formation of a step at the boundary between the adhesive layer 33 and the end portion 32 of the film 31 can be suppressed. Thus, for example, as shown in FIG. 1, interference of the boundary between the adhesive layer 33 and the end portion 32 of the film 31 with the skin surface 300 when the stretchable wiring substrate 100 is arranged along the skin surface 300 can be suppressed. As a result, a good feeling of wearing the stretchable wiring substrate 100 can be obtained.

[0031] Further, in the case of the present embodiment, the adhesive layer 33 includes the first adhesive layer 34a, a core material layer 34c (support layer) disposed on the first adhesive layer 34a, and the second adhesive layer 34b disposed on the core material layer 34c. The second adhesive layer 34b covers a part of the end surface 32a of the film 31. Here, the in-plane film thickness distribution of the first adhesive layer 34a and the second adhesive layer 34b is described. It is preferable that the film thickness difference of the first adhesive layer 34a between the part of the first adhesive layer 34a directly below the film 31 and in the vicinity of the end portion 32 of the film 31 and the part of the first adhesive layer 34a protruding from the end portion 32 of the film 31 and in the vicinity of the end portion 32 of the film 31 be relatively small. On the other hand, it is preferable that the film thickness difference of the second adhesive layer 34b between the part of the second adhesive layer 34b directly below the film 31 and in the vicinity of the end portion 32 of the film 31 and the part of the second adhesive layer 34b protruding from the end portion 32 of the film 31 and in the vicinity of the end portion 32 of the film 31 be relatively large. That is, it is preferable that the upper surface of the second adhesive layer 34b have a relatively low flatness. On the other hand, the lower surface of the second adhesive layer 34b, the core material layer 34c, and the upper surface and the lower surface of the first adhesive layer 34a each have a relatively high flatness. In addition, the "vicinity" of the "part in the vicinity of the end portion 32 of the film 31" here means a range defined by a horizontal distance (in-plane distance of the stretchable wiring substrate 100) of the thickness dimension of the film 31 from the end portion 32 of the film 31. According to such a structure, the film thickness of the first adhesive layer 34a changes less. Therefore, the film end portion can be appropriately supported by the adhesive layer 33 (particularly, the first adhesive layer 34a and the core material layer 34c). Also, stress applied to the stretchable wiring 20 via the end portion 32 of the film 31 can be absorbed. Figure 5 Figure 5

[0032] ​​More specifically, as an example, the adhesive layer 33 is a double-sided tape having a first adhesive layer 34a, a core material layer 34c (support layer) disposed on the first adhesive layer 34a, and a second adhesive layer 34b disposed on the core material layer 34c. The adhesive material of the adhesive layer 33 (double-sided tape) is not particularly limited. As an example of the adhesive material that can be used, an acrylic resin can be given. However, the present embodiment is not limited to this example. The adhesive layer 33 can be formed of a coated adhesive material, for example. Further, as the adhesive layer 33 (double-sided tape), an adhesive layer including a first adhesive layer 34a and a second adhesive layer 34b having different elastic moduli from each other can be used, for example. In this case, the elastic modulus of the first adhesive layer 34a is set to be higher than the elastic modulus of the second adhesive layer 34b, for example. Thereby, the film end portion can be appropriately supported by the adhesive layer 33 (particularly, the first adhesive layer 34a and the core material layer 34c).

[0033] The thickness dimension of the adhesive layer 33 (double-sided tape) is not particularly limited. The thickness dimension is preferably 10 μm or more and 500 μm or less, and more preferably 20 μm or more and 300 μm or less. Further, the thickness dimension of the adhesive layer 33 (double-sided tape) is equal to or more than the thickness dimension of the film 31, for example.

[0034] The method of forming the raised portion 36 is not particularly limited. For example, the raised portion 36 can be formed by coating the same kind of adhesive material as the adhesive layer 33 on the film 31 laminated on the adhesive layer 33 along the end portion 32 thereof. Alternatively, the outer peripheral edge portion of the recess of the upper surface (the surface opposite to the stretchable wiring 20 side) of the adhesive layer 33 can constitute the raised portion 36. Such a recess can be formed in a manner that the film 31 is disposed inside thereof. Further, as the adhesive layer 33, an adhesive layer having higher flowability can be used. Further, according to such a method, a structure in which the upper surface of the second adhesive layer 34b of the adhesive layer 33 has a relatively low flatness, and the lower surface of the second adhesive layer 34b, the core material layer 34c, and the upper and lower surfaces of the first adhesive layer 34a each have a relatively high flatness can be realized.

[0035] Further, it is preferable that the corner portion 32aa on the stretchable wiring 20 side among the end surface 32a of the end portion 32 (the left and right end portions of the film 31 in the case of the present embodiment) of the film 31 has a larger radius of curvature than the corner portion 32ab on the side opposite to the stretchable wiring 20 side. According to such a structure, the corner portion 32aa having a larger radius of curvature among the two corner portions 32aa and 32ab of the end surface 32a is located on the stretchable wiring 20 side. Therefore, the end portion 32 of the film 31 is more gently in contact with the stretchable wiring 20. Thus, the deformation and breakage of the stretchable wiring 20 can be more appropriately suppressed.

[0036] Preferably, the end face 32a of the ends 32 of the membrane 31 (in this embodiment, the left and right ends of the membrane 31) is inclined in such a way that it protrudes from the ends 32 of the membrane 31 as it approaches the stretchable wiring 20. According to this structure, the portion of the ends 32 of the membrane 31 on the side of the stretchable wiring 20 ( Figure 3 The lower part of the membrane 31 has a pointed shape. Therefore, the end 32 of the membrane 31 makes more gentle contact with the stretchable wiring 20. As a result, deformation and breakage of the stretchable wiring 20 can be more appropriately suppressed. Furthermore, during the manufacture of the stretchable wiring substrate 100, due to the pressure applied in the direction from the membrane 31 to the stretchable wiring 20, the membrane 31 is prone to warping in the opposite direction to the stretchable wiring 20. Therefore, the shear force applied to the stretchable wiring 20 via the membrane 31 can be reduced. Similarly, when using the stretchable wiring substrate 100, even if an external force is applied in the direction from the membrane 31 to the stretchable wiring 20, the shear force applied to the stretchable wiring 20 via the membrane 31 can be reduced.

[0037] The method for forming the end face 32a of the end 32 of the membrane 31 into the above shape is not particularly limited. As examples of the method, cutting and punching processes can be listed.

[0038] As described above, the exposed portion 25 of the stretchable wiring 20 is exposed from the adhesive layer 33 in a direction opposite to that of the stretchable substrate 10. This forms the second exposed electrode 55. More specifically, in the case of this embodiment, as... Figures 1 to 3 As shown, a portion of the main body 21a of the first stretchable wiring 21 protrudes from the first protrusion 35a of the film 31 and adhesive layer 33 in a direction opposite to the stretchable substrate 10 (upward in this embodiment). This forms the first exposed portion 25a. The first exposed portion 25a constitutes the second exposed electrode 55a. Similarly, a portion of the main body 22a of the second stretchable wiring 22 protrudes from the second protrusion 35b of the film 31 and adhesive layer 33 in a direction opposite to the stretchable substrate 10 (upward in this embodiment). This forms the second exposed portion 25b. The second exposed portion 25b constitutes the second exposed electrode 55b.

[0039] Furthermore, in this embodiment, the flexible wiring substrate 100 includes a conductive adhesive layer 61 that directly covers the second exposed electrode 55. And, as... Figure 4As shown, the stretchable wiring substrate 100 can be attached to the skin surface 300 of the living body via the conductive adhesive layer 61. That is, in the case of the present embodiment, the second exposed electrode 55 is a living body electrode configured to face the skin surface 300 of the living body. Via the second exposed electrode 55, the device 200 can detect a living body signal such as a brain wave, a muscle potential, or a heart electric potential from the living body. Also, the device 200 can apply an electric stimulus to the living body. Also, by the conductive adhesive layer 61, the second exposed electrode 55 can be favorably disposed along the skin surface 300 of the living body.

[0040] More specifically, in the case of the present embodiment, the stretchable wiring substrate 100 is provided with a plurality of conductive adhesive layers 61 (in the case of the present embodiment, the conductive adhesive layers 61a and 61b), which individually cover each of the plurality of stretchable wires 20 (the first stretchable wire 21 and the second stretchable wire 22).

[0041] The material of the conductive adhesive layer 61 is not particularly limited. As an example of the material, a hydrogel or an adhesive having conductivity can be given. In the case where the material of the conductive adhesive layer 61 is a hydrogel, the hydrogel includes, for example, an electrolyte (as an example, a sodium chloride aqueous solution) and a nonwoven fabric. The thickness of the conductive adhesive layer 61 is not particularly limited. The thickness is preferably 5 μm or more, and more preferably 20 μm or more and 1000 μm (1 mm) or less.

[0042] Further, the conductive adhesive layer 61 covers, for example, a part of the film 31 and the protruding portion 35 of the adhesive layer 33. Further, a peelable release film 65 is attached to the surface (the upper surface in FIG. 6) of the conductive adhesive layer 61 on the opposite side to the stretchable wire side. Figure 3 By this, the stretchable wiring substrate 100 has a configuration in which the stretchable wires 20 are reinforced (supported) by the film 31 and the release film 65. Therefore, the strength of the configuration of the stretchable wires 20 of the stretchable wiring substrate 100 before being mounted to the skin surface 300 can be further improved, in particular. Further, the pitch of the electrodes (terminals) of the first exposed electrode 51 and the second exposed electrode 55 can be secured by the configuration. Here, the first exposed electrode 51 is necessary for connection of the connection terminal 220 of the device 200 to the stretchable wires 20.

[0043] More specifically, the stretchable wiring substrate 100 is provided with, for example, a plurality of release films 65 (release films 65a, 65b). The release films 65 are individually attached to each of a plurality of conductive adhesive layers 61 (conductive adhesive layers 61a, 61b). The release film 65 has a Young's modulus greater than that of the stretchable base material 10. The material of the release film 65 is not particularly limited. As examples of the material, PET (polyethylene terephthalate) and paper can be given. All of the plurality of release films 65 can be configured of the same material. Alternatively, the plurality of release films 65 can be configured of different materials.

[0044] As shown in Figure 3 In the case of the present embodiment, the stretchable wiring substrate 100 is provided with the conductive adhesive layer 61a and the conductive adhesive layer 61b. The conductive adhesive layer 61a directly covers the 2nd exposed electrode 55a (the main body portion 21a of the 1st stretchable wiring 21). The conductive adhesive layer 61b directly covers the 2nd exposed electrode 55b (the main body portion 22a of the 2nd stretchable wiring 22). In addition, the stretchable wiring substrate 100 is provided with: the release film 65a attached to the conductive adhesive layer 61a; and the release film 65b attached to the conductive adhesive layer 61b. The release film 65a covers the entire conductive adhesive layer 61a in plan view. Similarly, the release film 65b covers the entire conductive adhesive layer 61b. However, the present embodiment is not limited to this example. A common release film 65 can be attached to the plurality of conductive adhesive layers 61a, 61b.

[0045] In use of the stretchable wiring substrate 100, for example, first, the release film 65 is peeled from the conductive adhesive layer 61. Next, as shown in Figure 4 the stretchable wiring substrate 100 is attached to the skin surface 300 with the conductive adhesive layer 61. Thereby, the stretchable wiring substrate 100 is attached to the skin surface 300 in a posture in which one face 10a of the stretchable base material 10 faces the skin surface 300 and the face on the opposite side thereof (the other face 10b of the stretchable base material 10) faces the direction opposite to the skin surface 300.

[0046] Next, the film 31 is laminated on the adhesive layer 33. At this time, the film 31 is aligned with respect to the adhesive layer 33 as described above. As a result, the adhesive layer 33 protrudes from the film 31 in a direction in which the stretchable wiring 20 protrudes from the end portion 32 of the laminated film 31. Further, the protruding portion (protruding portion 35) covers a part of the portion (protruding portion 26) of the stretchable wiring 20 that protrudes from the film 31. Next, the stretchable substrate 10 and the film 31 are heat-pressed and joined (heating and pressing). The heating method is not particularly limited. As an example of the heating method to be employed, a lamination method using a heated press can be given. However, in the present embodiment, the film 31 can be joined to the stretchable substrate 10 by only adhesion based on the adhesion of the adhesive layer 33, for example. Next, the conductive adhesive layer 61 is attached to the stretchable wiring 20. In this way, the conductive adhesive layer 61 covers the stretchable wiring 20. In this way, the stretchable wiring substrate 100 can be manufactured.

[0047] The embodiments have been described above with reference to the drawings. However, these described embodiments are examples of the present embodiment. The present embodiment can employ various structures other than the above-described structures.

[0048] The present embodiment includes the following technical ideas. (1) A stretchable wiring substrate including a stretchable substrate, a stretchable wiring formed on the stretchable substrate, an adhesive layer, and a film, the film being attached to the stretchable substrate via the adhesive layer, covering a part of the stretchable wiring, the stretchable wiring including a protruding portion that protrudes from the film, the adhesive layer including a protruding portion that protrudes from an end portion of the film in a direction in which the protruding portion of the stretchable wiring protrudes, and covers a part of the protruding portion. (2) In the stretchable wiring substrate described in (1), the adhesive layer covers a part of an end surface of the end portion of the film. (3) In the stretchable wiring substrate described in (2), the protruding portion includes a raised portion in the vicinity of the end portion of the film, the raised portion being locally raised in a direction opposite to the stretchable wiring, and covering a part of the end surface of the end portion of the film. (4) In the stretchable wiring substrate described in (2) or (3), the adhesive layer includes a first adhesive layer, a core layer disposed on the first adhesive layer, and a second adhesive layer disposed on the core layer, the second adhesive layer covering a portion of the end face of the end of the film, the first film thickness difference being less than the second film thickness difference, the first film thickness difference being the difference between the thickness of the portion of the first adhesive layer directly below the film and near the end of the film and the thickness of the portion of the first adhesive layer protruding from the end of the film and near the end of the film, and the second film thickness difference being the difference between the thickness of the portion of the second adhesive layer directly below the film and near the end of the film and the thickness of the portion of the second adhesive layer protruding from the end of the film and near the end of the film. (5) In any of the stretchable wiring substrates described in (1) to (4), the radius of curvature of the corner of the end face of the end of the film on the stretchable wiring side is greater than the radius of curvature of the corner of the end face opposite to the stretchable wiring side. (6) In any of the stretchable wiring substrates described in (1) to (5), the end face of the end of the film is inclined in such a way that it protrudes in the direction in which the stretchable wiring extends from the end of the film as it approaches the stretchable wiring side. (7) In any of the stretchable wiring substrates described in (1) to (6), the adhesive layer protrudes from the end of the film by a length of 0.5 mm or more. (8) In any of the stretchable wiring substrates described in (1) to (7), the elastic modulus of the stretchable wiring is less than or equal to the elastic modulus of the stretchable substrate and less than 1 MPa. The detailed description has been given for illustrative and explanatory purposes. Many variations and modifications are possible in accordance with the teachings above. The detailed description is not without omissions or intended to limit the subject matter described herein. Although the subject matter has been described in words with particular structural features and / or methodological processes, it should be understood that the subject matter defined in the claims is not necessarily limited to the specific features or processes described. Rather, the specific features and processes described are illustrated as examples of implementing the claims.

Claims

1. A scalable wiring substrate, wherein, The flexible wiring substrate includes a flexible substrate, flexible wiring formed on the flexible substrate, an adhesive layer, and a film. The membrane is adhered to the stretchable substrate via the adhesive layer, covering a portion of the stretchable wiring. The flexible wiring includes an extension extending from the membrane. The adhesive layer includes protrusions. The protrusion extends from the end of the membrane toward the protrusion in the direction of extension and covers a portion of the protrusion.

2. The flexible wiring substrate according to claim 1, wherein, The adhesive layer covers a portion of the end face of the membrane at the end of the membrane.

3. The flexible wiring substrate according to claim 2, wherein, The protrusion includes a raised portion near the said end of the membrane. The raised portion bulges partially in the direction opposite to the elastic wiring, covering a portion of the end face of the end of the membrane.

4. The flexible wiring substrate according to claim 2 or 3, wherein, The adhesive layer includes a first adhesive layer, a core material layer disposed on the first adhesive layer, and a second adhesive layer disposed on the core material layer. The second adhesive layer covers a portion of the end face of the end of the film. The first film thickness difference is less than the second film thickness difference. The first film thickness difference is the difference between the thickness of the portion of the first adhesive layer directly below the film and near the end of the film and the thickness of the portion of the first adhesive layer protruding from the end of the film and near the end of the film. The second film thickness difference is the difference between the thickness of the portion of the second adhesive layer directly below the film and near the end of the film and the thickness of the portion of the second adhesive layer protruding from the end of the film and near the end of the film.

5. The flexible wiring substrate according to any one of claims 1 to 3, wherein, The radius of curvature of the corner of the end face of the membrane on the stretchable wiring side is greater than the radius of curvature of the corner of the end face opposite to the stretchable wiring side.

6. The flexible wiring substrate according to any one of claims 1 to 3, wherein, The end face of the membrane is inclined in such a way that it protrudes from the end of the membrane as it approaches the stretchable wiring side.

7. The flexible wiring substrate according to any one of claims 1 to 3, wherein, The adhesive layer protrudes from the end of the film by a length of 0.5 mm or more.

8. The flexible wiring substrate according to any one of claims 1 to 3, wherein, The elastic modulus of the stretchable wiring is below the elastic modulus of the stretchable substrate and below 1 MPa.

Images