Stretchable Device

Abstract

The present invention provides an expansion / contraction device which is provided with: an expansion / contraction base material that is stretchable; and a first electrode, a second electrode and a third electrode, which are provided on the expansion / contraction base material. The ionization tendency of a conductive material that is a main component of the third electrode is lower than the ionization tendency of a conductive material that is a main component of the first electrode and the ionization tendency of a conductive material that is a main component of the second electrode; and the shortest distance between the first electrode and the third electrode is shorter than the shortest distance between the first electrode and the second electrode.

Description

[Technical field]

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

[0002] A conventional stretchable device is described in Japanese Patent No. 3518023 (Patent Document 1). This stretchable device includes a silver resin pattern provided on an insulating synthetic resin substrate, an insulating resin provided on the silver resin pattern so as to expose a portion of the silver resin pattern, and a fluorine resin thin film provided on the exposed portion of the silver resin pattern. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 3518023 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the conventional stretchable devices, migration may occur in the silver-resin-based pattern, and migration may occur significantly especially when a high load voltage is applied to the silver-resin-based pattern.

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

[0006] In order to achieve the above object, a stretchable device according to one aspect of the present invention comprises: A stretchable base material; A first electrode, a second electrode, and a third electrode provided on the stretchable substrate, the ionization tendency of the conductive material that is a main component of the third electrode is smaller than the ionization tendency of the conductive material that is a main component of the first electrode and the ionization tendency of the conductive material that is a main component of the second electrode; The shortest distance between the first electrode and the third electrode is smaller than the shortest distance between the first electrode and the second electrode. Effect of the Invention

[0007] According to a stretchable device according to an aspect of the present invention, migration can be suppressed. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic perspective view partially illustrating a stretchable device according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is a cross-sectional view taken along line II-II of FIG. [Figure 3A] FIG. 3A is an explanatory diagram illustrating a method for producing a stretchable device. [Figure 3B] FIG. 3B is an explanatory diagram illustrating a method for producing a stretchable device. [Figure 3C] FIG. 3C is an explanatory diagram illustrating a method for producing a stretchable device. [Figure 4A] FIG. 4A is a schematic cross-sectional view showing a stretchable device according to a second embodiment of the present invention. [Figure 4B] FIG. 4B is a schematic cross-sectional view showing a stretchable device according to a modified example of the second embodiment of the present invention. [Diagram 5] FIG. 5 is a schematic cross-sectional view showing a stretchable device according to a third embodiment of the present invention. [Figure 6] FIG. 6 is a schematic cross-sectional view showing a stretchable device according to a fourth embodiment of the present invention. [Figure 7] FIG. 7 is a schematic cross-sectional view showing a stretchable device according to a fifth embodiment of the present invention. [Figure 8] FIG. 8 is a schematic cross-sectional view showing a stretchable device according to a sixth embodiment of the present invention. [Figure 9]FIG. 9 is a schematic cross-sectional view showing a stretchable device according to a seventh embodiment of the present invention. [Figure 10] FIG. 10 is a schematic cross-sectional view showing a stretchable device according to an eighth embodiment of the present invention. [Figure 11A] FIG. 11A is a schematic cross-sectional view showing a stretchable device according to a ninth embodiment of the present invention. [Figure 11B] FIG. 11B is a schematic cross-sectional view showing a stretchable device according to a modified example of the ninth embodiment of the present invention. [Figure 11C] FIG. 11C is a schematic cross-sectional view showing a stretchable device according to a modified example of the ninth embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

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

[0010] The present disclosure is particularly effective for circuit boards in which electrodes are formed from metals that are prone to migration (the movement of metal ions), such as silver and copper, on a substrate that is prone to moisture absorption, such as an elastic substrate. Migration can proceed from the positive electrode to the negative electrode.

[0011] When a substrate with electrodes of silver, copper, or the like is used in a humid environment, the function may be impaired by migration (for example, short circuit between electrodes). In order to prevent this, a method of covering the electrodes with a protective layer to improve migration resistance has been used in the past. However, in recent years, due to reasons such as finer spacing between electrodes due to miniaturization of circuit boards, higher design voltages due to diversification of applications, and changes to substrate specifications with poor migration resistance due to product characteristics, migration may not be suppressed with conventional techniques. In addition, in medical equipment devices, the materials used as protective layers are limited from the viewpoint of biocompatibility. Therefore, how to ensure migration resistance is an issue. The present disclosure is intended to solve this issue.

[0012] [First embodiment] (Schematic configuration of the stretchable device 1) A schematic configuration of a stretchable device 1 according to a first embodiment will be described with reference to Fig. 1 and Fig. 2. Fig. 1 is a schematic perspective view partially showing the stretchable device 1. Fig. 2 is a cross-sectional view taken along line II-II in Fig. 1. In the drawings in this specification, the thickness direction of the stretchable base material is indicated by a double-headed arrow T.

[0013] The stretchable device 1 includes a stretchable base material 10, and a first electrode 21, a second electrode 22, and a third electrode 23 provided on the stretchable base material 10. The stretchable device 1 is used, for example, to be attached to a living body and to measure a biosignal.

[0014] Here, "on the stretchable substrate" does not mean an absolute direction such as vertically upward as determined by the direction of gravity, but rather means the direction toward the outside of the outside and inside of the stretchable substrate with the surface of the stretchable substrate as the boundary. Therefore, "on the stretchable substrate" is a relative direction determined by the direction of the surface of the stretchable substrate. In addition, "above" an element includes not only a position directly above the element (on) but also a position above the element, i.e., a position above the element through another object or a position above the element with a gap (above).

[0015] The stretchable substrate 10 is a sheet-like or film-like substrate made of a stretchable resin material. Examples of the resin material include thermoplastic polyurethane (TPU). The thickness of the stretchable substrate 10 is not particularly limited, but from the viewpoint of not inhibiting the stretching of the surface of the living body when attached to the living body, it is preferably 1 mm or less, more preferably 100 μm or less, and even more preferably 50 μm or less. In addition, the thickness of the stretchable substrate 10 is preferably 1 μm or more. The shape of the stretchable substrate 10 is not particularly limited. In this embodiment, the stretchable substrate 10 is shaped to stretch in one direction when viewed from the thickness direction T.

[0016] The first electrode 21 and the second electrode 22 are electrodes for signals. The first electrode 21 and the second electrode 22 may be wiring. The shapes of the first electrode 21 and the second electrode 22 are not particularly limited. In this embodiment, each of the first electrode 21 and the second electrode 22 is wiring and has a shape extending in one direction. Each of the first electrode 21 and the second electrode 22 may be provided in a plurality of electrodes. In addition, the first electrode and the second electrode do not have to be provided on the same plane.

[0017] The first electrode 21 and the second electrode 22 are formed of a conductive material. The first electrode 21 and the second electrode 22 are preferably stretchable. The conductive material of the first electrode 21 and the second electrode 22 may be, for example, a metal foil such as silver, copper, or nickel, or a mixture of a metal powder such as silver, copper, or nickel and an elastomer resin such as an epoxy resin, a urethane resin, an acrylic resin, or a silicone resin. When the conductivity of the material is important, the conductive material of the first electrode 21 and the second electrode 22 is preferably silver. This allows the first electrode 21 and the second electrode 22 to be formed with low resistance.

[0018] The third electrode 23 is an electrode for suppressing migration. The third electrode 23 may be a wiring. A voltage for suppressing migration is applied to the third electrode 23. The third electrode 23 may be used for signals in addition to suppressing migration. The shape of the third electrode 23 is not particularly limited. In this embodiment, the third electrode 23 is in a plate shape. The third electrode 23 may be a dummy electrode to which no signal is transmitted or received.

[0019] The third electrode 23 is made of a conductive material. The third electrode 23 is preferably stretchable. The conductive material of the third electrode 23 is, for example, a material having migration resistance (in other words, having a small ionization tendency), such as carbon or platinum.

[0020] The ionization tendency of the conductive material that is the main component of the third electrode 23 is smaller than the ionization tendency of the conductive material that is the main component of the first electrode 21 and the ionization tendency of the conductive material that is the main component of the second electrode 22. The "conductive material that is the main component" refers to the component of the element that has the largest abundance ratio (weight %) among the elements that exhibit conductivity contained in the electrode. For example, the first electrode 21 and the second electrode 22 can both be silver electrodes, and the third electrode 23 can be a carbon electrode. The ionization tendency of the conductive material that is the main component of the third electrode 23, i.e., carbon, is smaller than the ionization tendency of the conductive material that is the main component of the first electrode 21, i.e., silver, and the ionization tendency of the conductive material that is the main component of the second electrode 22, i.e., silver.

[0021] As shown in FIG. 2, the shortest distance D1 between the first electrode 21 and the third electrode 23 is smaller than the shortest distance D2 between the first electrode 21 and the second electrode 22. The shortest distance D1 refers to the minimum value of the distance in the opposing direction between the first electrode 21 and the third electrode 23 (in this embodiment, the thickness direction T of the stretchable base material 10). The shortest distance D2 refers to the minimum value of the distance in the opposing direction between the first electrode 21 and the second electrode 22 (in this embodiment, the left-right direction in FIG. 2). The shortest distance D1 and the shortest distance D2 may be measured in a cross section that is parallel to the thickness direction T of the stretchable base material 10 and intersects with the first electrode 21, the second electrode 22, and the third electrode 23. In this embodiment, the shortest distance D1 and the shortest distance D2 may be measured, for example, in a cross section that passes through the center of the extension direction of the first electrode 21 and is perpendicular to the extension direction of the first electrode 21.

[0022] According to the above configuration, since the shortest distance D1 between the first electrode 21 and the third electrode 23 is smaller than the shortest distance D2 between the first electrode 21 and the second electrode 22, the strength of the electric field formed between the first electrode 21 and the third electrode 23 is greater than the strength of the electric field formed between the first electrode 21 and the second electrode 22. Therefore, the force that pulls the first electrode 21 and the third electrode 23 against each other is greater than the force that pulls the first electrode 21 and the second electrode 22 against each other. As a result, migration that may occur between the first electrode 21 and the second electrode 22 can be suppressed. In addition, since the ionization tendency of the conductive material that is the main component of the third electrode 23 is smaller than the ionization tendency of the conductive material that is the main component of the first electrode 21 and the conductive material that is the main component of the second electrode 22, migration that may occur between the first electrode 21 and the third electrode 23 is suppressed even if the force that pulls the first electrode 21 and the third electrode 23 against each other becomes larger than the force that pulls the first electrode 21 and the second electrode 22 against each other. This makes it possible to suppress migration that may occur in the stretchable device 1.

[0023] (Detailed configuration of stretchable device 1) Next, the detailed configuration of the stretchable device 1 will be described.

[0024] As shown in Fig. 1 and Fig. 2, the stretchable base material 10 has a first main surface 10a. The first electrode 21, the second electrode 22, and the third electrode 23 are provided on the first main surface 10a. The first electrode 21 and the second electrode 22 are arranged on the same plane. The third electrode 23 is arranged at a position different from the first electrode 21 and the second electrode 22 in the thickness direction T of the stretchable base material 10. The stretchable device 1 has an insulating layer 30 provided at least between the first electrode 21 and the third electrode 23 and between the second electrode 22 and the third electrode 23.

[0025] Here, "on the first main surface" does not mean an absolute direction such as vertically upward defined by the direction of gravity, but means a direction toward the outside of the outside and inside of the stretchable base material with the first main surface of the stretchable base material as a boundary. Therefore, "on the first main surface" is a relative direction determined by the orientation of the first main surface of the stretchable base material.

[0026] According to the above configuration, the insulating layer 30 can prevent the first electrode 21 and the second electrode 22 from contacting the third electrode 23. That is, the distance between the first electrode 21 and the third electrode 23 can be made sufficiently smaller than when the first electrode 21, the second electrode 22, and the third electrode 23 are arranged on the same plane. Therefore, migration that may occur in the stretchable device 1 can be further suppressed. On the other hand, when the first electrode 21, the second electrode 22, and the third electrode 23 are arranged on the same plane, it is difficult to make the distance between the first electrode 21 and the third electrode 23 sufficiently small, taking into account printing bleeding during electrode formation. In addition, the insulating layer 30 can suppress short circuits between the first electrode 21 and the third electrode 23 and between the second electrode 22 and the third electrode 23.

[0027] The third electrode 23, the insulating layer 30, the first electrode 21, and the second electrode 22 are laminated in this order from the first main surface 10a side of the stretchable base material 10. With this configuration, the insulating layer 30 and the third electrode 23 are present between the first electrode 21 and the second electrode 22 and the stretchable base material 10, so that the intrusion of moisture from the stretchable base material 10 side into the first electrode 21 and the second electrode 22 can be suppressed, and migration that may occur between the first electrode 21 and the second electrode 22 can be further suppressed.

[0028] Specifically, the third electrode 23 is provided on the entire first main surface 10a of the stretchable base material 10. In other words, the third electrode 23 is provided in a plate shape so as to cover the entire first main surface 10a of the stretchable base material 10. The insulating layer 30 is provided on the entire surface 23a of the third electrode 23 located on the opposite side to the stretchable base material 10 side. In this embodiment, the surface 23a of the third electrode 23 corresponds to the surface located on the opposite side to the surface of the third electrode facing the stretchable base material 10. The insulating layer 30 is provided in a plate shape so as to cover the entire surface 23a of the third electrode 23. The first electrode 21 and the second electrode 22 are provided on a part of the surface 30a of the insulating layer 30 on the opposite side to the third electrode 23 side. The first electrode 21 extends along the extension direction of the stretchable base material 10. The second electrode 22 extends along the extension direction of the stretchable base material 10. The first electrode 21 and the second electrode 22 are spaced apart by a minimum distance D2.

[0029] The insulating layer 30 electrically insulates the first electrode 21 and the second electrode 22 from the third electrode 23. The insulating layer 30 is preferably stretchable. The insulating layer 30 may or may not be water absorbent. The shape of the insulating layer 30 is not particularly limited as long as it can electrically insulate the first electrode 21 and the second electrode 22 from the third electrode 23. The insulating material of the insulating layer 30 is not particularly limited as long as it can electrically insulate the first electrode 21 and the second electrode 22 from the third electrode 23. The insulating material of the insulating layer 30 is, for example, polyester resin.

[0030] (Other preferred configurations) Preferably, the polarity of the potential of the first electrode 21 is different from the polarity of the potential of the second electrode 22, and the polarity of the potential of the third electrode 23 is different from the polarity of the potential of the first electrode 21. With this configuration, signals of different polarities can be extracted from the first electrode 21 and the second electrode 22. When there are a plurality of the first electrodes 21 and the second electrodes 22, the first electrodes 21 and the second electrodes 22 may be alternately arranged along a direction perpendicular to the extension direction of the first electrode 21, and the polarity of the potential of the first electrode 21 may be made different from the polarity of the potential of the second electrode 22, and the polarity of the potential of the third electrode 23 may be made different from the polarity of the potential of the first electrode 21. This allows a plurality of signals of different polarities to be extracted from the first electrode 21 and the second electrode 22.

[0031] Preferably, the polarity of the potential of the first electrode 21 is negative. In this case, the polarity of the potential of the second electrode 22 is positive, and the polarity of the potential of the third electrode 23 is positive. As described above, since the shortest distance D1 between the first electrode 21 and the third electrode 23 is smaller than the shortest distance D2 between the first electrode 21 and the second electrode 22, the intensity of the electric field formed between the first electrode 21 and the third electrode 23 is greater than the intensity of the electric field formed between the first electrode 21 and the second electrode 22. Therefore, according to the above configuration, the movement of cations from the second electrode 22 to the first electrode 21 through the insulating layer 30 can be suppressed, and migration that may occur between the first electrode 21 and the second electrode 22 can be suppressed. In addition, since the polarity of the potential of the third electrode is positive, the movement of cations from the second electrode 22 to the third electrode 23 through the insulating layer 30 is suppressed. Furthermore, as described above, the ionization tendency of the conductive material that is the main component of the third electrode 23 is smaller than the ionization tendency of the conductive material that is the main component of the first electrode 21 and the conductive material that is the main component of the second electrode 22, and therefore, the movement of cations from the third electrode 23 to the first electrode 21 through the insulating layer 30 is suppressed. As described above, with the above configuration, migration that may occur in the stretchable device 1 can be further suppressed.

[0032] On the other hand, when the third electrode 23 is not provided, when the polarity of the potential of the first electrode 21 is negative and the polarity of the potential of the second electrode 22 is positive, the cations can easily move from the second electrode 22 to the first electrode 21 through the insulating layer 30. As a result, migration can occur between the first electrode 21 and the second electrode 22. Even when the third electrode 23 is provided, if the ionization tendency of the conductive material that is the main component of the third electrode 23 is the same as or greater than the ionization tendency of the conductive material that is the main component of the first electrode 21 and the ionization tendency of the conductive material that is the main component of the second electrode 22, the cations can easily move from the third electrode 23 to the first electrode 21 through the insulating layer 30. As a result, migration can occur between the first electrode 21 and the third electrode 23.

[0033] Preferably, the third electrode 23 overlaps the entire first electrode 21 when viewed from the thickness direction T of the stretchable base material 10. More preferably, the third electrode 23 overlaps the entire first electrode 21 when viewed from the thickness direction T of the stretchable base material 10, and the plane area of ​​the third electrode 23 is larger than the plane area of ​​the first electrode 21. With this configuration, the third electrode can be easily aligned, and therefore the third electrode 23 can be easily formed. In addition, since the first electrode 21 is disposed directly above the third electrode 23, the shortest distance D1 between the first electrode 21 and the third electrode 23 can be made smaller, and migration that may occur between the first electrode 21 and the second electrode 22 can be further suppressed.

[0034] Preferably, the third electrode 23 overlaps the entire first electrode 21 and the entire second electrode 22 when viewed from the thickness direction T of the stretchable base material 10. More preferably, the third electrode 23 overlaps the entire first electrode 21 and the entire second electrode 22 when viewed from the thickness direction T of the stretchable base material 10, and the third electrode 23 overlapping the entire first electrode 21 and the third electrode overlapping the entire second electrode 22 are integrated, and the plane area of ​​the third electrode 23 is larger than the plane area of ​​the first electrode 21 and the plane area of ​​the second electrode 22 combined. According to this configuration, for example, the third electrode 23 can be formed in a plate shape so as to cover the entire first main surface 10a of the stretchable base material 10, and patterning of the third electrode 23 is not required, so that the third electrode 23 can be easily formed. Furthermore, since the first electrode 21 is disposed directly above the third electrode 23, the shortest distance D1 between the first electrode 21 and the third electrode 23 can be made smaller, thereby further suppressing migration that may occur between the first electrode 21 and the second electrode 22.

[0035] Preferably, a protective layer (not shown) is provided on the insulating layer 30 so as to cover the first electrode 21 and the second electrode 22. The protective layer is preferably made of a resin material having elasticity, such as an ionomer resin, a polyester resin, a styrene resin, an olefin resin, an epoxy resin, a urethane resin, an acrylic resin, or a silicone resin. This configuration can protect the first electrode 21 and the second electrode 22 from the external environment. The insulating layer 30 may also be disposed so as to cover the first electrode 21 and the second electrode 22.

[0036] (Method of Manufacturing the Stretchable Device 1) Next, a method for manufacturing the stretchable device 1 will be described with reference to Figures 3A, 3B, and 3C. Figures 3A, 3B, and 3C are explanatory diagrams for explaining the method for manufacturing the stretchable device 1. Note that in the following description, process conditions, materials used, and the like for the stretchable device 1 are specifically shown, but the following is merely one example of a method for manufacturing the stretchable device 1, and the method for manufacturing the stretchable device 1 is not limited by the process conditions and materials used below.

[0037] 3A, the third electrode 23 is formed on the stretchable substrate 10 by, for example, screen printing. The stretchable substrate 10 is, for example, thermoplastic polyurethane (TPU). The process conditions and materials used are, for example, as follows:

[0038] Third electrode material: DuPont carbon electrode 7105 Elastic base material: Seedam DUS605_6UVPT (50μm thick) Printing plate: SP plate (mesh: #500, linear 18μm, emulsion thickness 11μm, inner dimensions 280mm square), pattern area: 150×150mm Printing conditions: Squeegee: Micro squeegee (rubber hardness: 70°), squeegee pressure: 200N / 160mm width, squeegee speed: 150mm / s, squeegee attack angle: 60°, distance: 1.5mm Drying conditions: Circulating oven 100℃ x 30 minutes

[0039] 3B, an insulating layer 30 is formed on the third electrode 23 by, for example, screen printing. The process conditions and materials used are, for example, as follows.

[0040] Insulation layer material: Henkel ELECTRODAG 452SS Printing plate: SP plate (mesh: #352, linear 23μm, emulsion thickness 17μm, inner dimensions 280mm square), pattern area: 150×150mm Printing conditions: Squeegee: Micro squeegee (rubber hardness: 70°), squeegee pressure: 200N / 160mm width, squeegee speed: 150mm / s, squeegee attack angle: 70°, distance: 1.5mm Curing conditions: UV light irradiation; 500mJ / cm at i-line (365nm) 2

[0041] 3C, the first electrode 21 and the second electrode 22 are formed on the insulating layer 30 by, for example, screen printing. The process conditions and materials used are, for example, as follows.

[0042] Electrode material: DuPont silver electrode 5064 Printing plate: SP plate (mesh: #500, linear 18μm, emulsion thickness 11μm, inner dimensions 280mm square), pattern area: 150×150mm Printing conditions: Squeegee: Micro squeegee (rubber hardness: 70°), squeegee pressure: 100N / 160mm width, squeegee speed: 150mm / s, squeegee attack angle: 50°, distance: 1.5mm Drying conditions: Circulating oven 100℃ x 30 minutes

[0043] [Second embodiment] Hereinafter, the stretchable device 1A according to the second embodiment will be described with reference to Fig. 4A. Fig. 4A corresponds to the cross section taken along line II-II in Fig. 1. The stretchable device 1A is different from the stretchable device 1 according to the first embodiment in the shape of the insulating layer.

[0044] The insulating layer 30A of the stretchable device 1A has a first portion 31 provided between the first electrode 21 and the third electrode 23, and a second portion 32 provided between the second electrode 22 and the third electrode 23. The first portion 31 and the second portion 32 are separated from each other. In other words, unlike the insulating layer 30 of the first embodiment, the insulating layer 30A is divided into the first portion 31 and the second portion 32. The insulating layer 30A may be divided into three or more portions.

[0045] Specifically, the first portion 31 is provided between the first electrode 21 and the third electrode 23, and electrically insulates the first electrode 21 from the third electrode 23. The first portion 31 extends along the extension direction of the first electrode 21. The second portion 32 is provided between the second electrode 22 and the third electrode 23, and electrically insulates the second electrode 22 from the third electrode 23. The second portion 32 extends along the extension direction of the second electrode 22. The first portion 31 and the second portion 32 are spaced apart at a predetermined interval in the opposing direction of the first electrode 21 and the second electrode 22 (the left-right direction in FIG. 4A).

[0046] According to the above configuration, the path along which ions move in the insulating layer 30A can be cut off between the first electrode 21 and the second electrode 22. Therefore, migration that may occur between the first electrode 21 and the second electrode 22 can be further suppressed.

[0047] According to the above configuration, the insulating layers 30A are arranged at intervals on the stretchable base material 10. This reduces the plane area of ​​the insulating layers 30A compared to when the insulating layers are continuous, thereby further reducing the effect that the insulating layers 30A may have on the stretchability of the stretchable device 1A. Therefore, according to the above configuration, it is possible to obtain a stretchable device with excellent stretchability while suppressing migration by the insulating layers.

[0048] In addition, the stretchable device may be attached to, for example, a living body. In such a case where the stretchable device is used on a living body, the stretchable device may be required to have breathability in order to reduce discomfort such as stuffiness when the stretchable device is worn. This may be achieved, for example, by using a breathable material for the stretchable base material 10. On the other hand, in order to suppress migration between electrodes, it is preferable to use a material with low breathability as the insulating layer. Therefore, when the insulating layer is disposed over the entire stretchable device 1A as viewed from the thickness direction T of the stretchable base material 10, the breathability may be reduced.

[0049] According to the above configuration, the first portion 31 and the second portion 32 of the insulating layer 30A are spaced apart from each other. Therefore, the stretchable device 1A has an area on the stretchable base material 10A between the first portion 31 and the second portion 32 where the insulating layer 30A is not provided. This makes it possible to suppress a decrease in the breathability of the stretchable device due to the insulating layer. That is, a stretchable device with good breathability is realized while suppressing migration by the insulating layer.

[0050] In the first embodiment, a single insulating layer 30 is formed continuously over the entire stretchable device when viewed from the thickness direction T of the stretchable base material 10, whereas in the second embodiment, multiple insulating layers with small planar areas are provided. That is, in the stretchable device 1A of the second embodiment, the insulating layer 30A is divided into a first portion 31 and a second portion 32, so that the area of ​​the insulating layer provided continuously can be reduced. This makes it possible to more precisely control the film thickness of the insulating layer compared to the case where a single insulating layer is provided continuously over a wide range. Specifically, the non-uniformity of the thickness of the insulating layer due to printing unevenness or the like is reduced, and a stretchable device 1A including an insulating layer 30A having a more uniform thickness can be provided.

[0051] 4A, the thickness of the insulating layer 30A may correspond to the shortest distance D1 between the first electrode 21 and the third electrode 23. When the insulating layer 30A has a uniform thickness as described above, the shortest distance D1 between the first electrode 21 and the third electrode 23 becomes more uniform, and migration may be more suitably suppressed.

[0052] When a protective layer 40 is provided to cover the first electrode 21 and the second electrode 22, the protective layer 40 may be present in the space between the first portion 31 and the second portion 32 (see FIG. 4B). This can further suppress migration that may occur between the first electrode 21 and the second electrode 22. In addition, the protective layer 40 is present so as to bite into the space between the first portion 31 and the second portion 32, so that the protective layer can be suitably held by an anchor effect. This can suitably suppress peeling of the protective layer 40 from the stretchable device 1A.

[0053] [Third embodiment] Hereinafter, a stretchable device 1B according to a third embodiment will be described with reference to Fig. 5. Fig. 5 corresponds to the cross section taken along II-II in Fig. 1. The stretchable device 1B is different from the stretchable device 1 according to the first embodiment in the shape of the third electrode.

[0054] The third electrode 23B of the stretchable device 1B is shaped to correspond to the shapes of the first electrode 21 and the second electrode 22. Specifically, the third electrode 23B has a first portion 231 shaped to correspond to the shape of the first electrode 21 and a second portion 232 shaped to correspond to the shape of the second electrode 22. That is, the first portion 231 extends linearly along the extension direction of the first electrode 21. The second portion 232 extends linearly along the extension direction of the second electrode 22. In short, the third electrode 23B is divided into the first portion 231 and the second portion 232, unlike the third electrode 23 of the first embodiment. The first portion 231 overlaps with the first electrode 21 when viewed from the thickness direction T of the stretchable substrate 10. The second portion 232 overlaps with the second electrode 22 when viewed from the thickness direction T of the stretchable substrate 10.

[0055] According to the above configuration, since the third electrode 23B is divided, the electric field formed between the first electrode 21 and the third electrode 23B can be concentrated compared to the case where the third electrode 23B is not divided. Therefore, the force that the first electrode 21 and the third electrode 23B pull each other is even greater than the force that the first electrode 21 and the second electrode 22 pull each other. As a result, migration that may occur between the first electrode 21 and the second electrode 22 can be further suppressed. In addition, since the plane area of ​​the third electrode 23B can be made smaller compared to the case where the third electrode 23B is not divided, the stretchability of the stretchable device 1B can be improved.

[0056] In the stretchable device, a transparent or semitransparent material can be used for materials other than the electrodes (i.e., the stretchable base material 10, the insulating layer 30, and / or the protective layer, etc.). According to the above configuration, the third electrode 23B is arranged in a region overlapping with the first electrode 21 or the second electrode 22 when viewed from the thickness direction T of the stretchable base material 10, without covering the entire first main surface 10a of the transparent or semitransparent stretchable base material 10. In other words, when viewed from the thickness direction T of the stretchable base material 10, the stretchable device has electrodes arranged only in a partial region of the first main surface 10a of the transparent or semitransparent stretchable base material 10. Therefore, the stretchable device can have a transparent or semitransparent region in a region not provided with an electrode when viewed from the thickness direction T of the stretchable base material 10. This makes it possible to visually confirm the mounting position of the stretchable device through the transparent or semitransparent region.

[0057] In addition, the second portion 232 of the third electrode 23B is preferably provided in order to reduce unevenness on the upper surface of the insulating layer 30 that may be caused by the third electrode 23B, but may not be provided. In this case, the electric field formed between the first electrode 21 and the third electrode 23B can be further concentrated, so that migration that may occur between the first electrode 21 and the second electrode 22 can be further suppressed.

[0058] [Fourth embodiment] Hereinafter, a stretchable device 1C according to a fourth embodiment will be described with reference to Fig. 6. Fig. 6 corresponds to the cross section taken along line II-II in Fig. 1. The stretchable device 1C is different from the stretchable device 1 according to the first embodiment in the shape of the third electrode.

[0059] The third electrode 23C of the stretchable device 1C does not overlap with the first electrode 21 and the second electrode 22 when viewed from the thickness direction T of the stretchable base material 10. Specifically, the third electrode 23C is provided on a part of the first main surface 10a of the stretchable base material 10. The third electrode 23C extends linearly along the extension direction of the first electrode 21. The third electrode 23C is disposed between the first electrode 21 and the second electrode 22 when viewed from the thickness direction T of the stretchable base material 10.

[0060] According to the above configuration, in a cross section perpendicular to the extension direction of the first electrode 21, the first electrode 21, the third electrode 23, and the second electrode 22 can be alternately arranged in a staggered pattern along a direction perpendicular to the thickness direction T of the stretchable base material, so that the stretchability of the stretchable device 1C can be made closer to uniform. In particular, as described above, when the insulating layer 30 is arranged so as to cover the first electrode 21 and the second electrode 22, the stretchability of the stretchable device 1C can be made closer to uniform.

[0061] Moreover, according to the above configuration, the thickness of the insulating layer 30 can be reduced. In the above configuration, the third electrodes 23C are arranged alternately so as not to overlap the first electrodes 21 and the second electrodes 22 when viewed from the thickness direction T of the stretchable base material 10. That is, since the third electrodes 23C are offset with respect to the first electrodes 21 and the second electrodes 22, the thickness of the insulating layer 30 can be reduced while suitably securing the shortest distance D1 between the first electrodes 21 and the third electrodes 23C. Specifically, the insulating layer 30 covering the third electrodes 23C may have a smaller thickness compared to the case where the first electrodes 21 and the second electrodes 22 overlap the third electrodes 23C in the thickness direction T (for example, the configuration shown in FIG. 5). This allows the stretchable device to be made lower in height.

[0062] When the insulating layer 30 has elasticity, the thickness of the insulating layer 30 in an elongated state may be smaller than the thickness of the insulating layer 30 in a non-elongated state in the cross-sectional view shown in Fig. 6. According to the above configuration, the third electrode 23C does not overlap the first electrode 21 and the second electrode 22 when viewed from the thickness direction T of the stretchable substrate 10, so that even if the thickness of the insulating layer 30 is relatively reduced by elongation, contact between the electrodes can be suitably prevented.

[0063] Preferably, in a cross section parallel to the thickness direction T of the stretchable base material 10 and intersecting the first electrode 21 and the third electrode 23C, the cross-sectional area A3 of the third electrode 23C is 105% or less of the cross-sectional area A1 of the first electrode 21. This configuration can improve the stretchability of the stretchable device 1C. More preferably, the cross-sectional area A3 of the third electrode 23C is 100% or less of the cross-sectional area A1 of the first electrode 21.

[0064] Similarly, in a cross section parallel to the thickness direction T of the stretchable substrate 10 and intersecting the second electrode 22 and the third electrode 23C, the cross-sectional area A3 of the third electrode 23C is preferably 105% or less of the cross-sectional area A2 of the second electrode 22. More preferably, the cross-sectional area A3 of the third electrode 23C is 100% or less of the cross-sectional area A2 of the second electrode 22. As the cross-sectional areas of the first electrode 21, the second electrode 22, and the third electrode 23 are closer to being the same, the stretchability of the stretchable device 1C can be made closer to being uniform.

[0065] Preferably, in a cross section parallel to the thickness direction T of the stretchable substrate 10 and intersecting the first electrode 21 and the third electrode 23C, the cross-sectional area A3 of the third electrode 23C is 10% or more of the cross-sectional area A1 of the first electrode 21. The cross-sectional area A3 of the third electrode 23C is more preferably 50% or more, and even more preferably 90% or more, of the cross-sectional area A1 of the first electrode 21. With this configuration, the cross-sectional areas of the first electrode 21 and the second electrode 22 and the third electrode 23 approach the same, and the stretchability of the stretchable device 1C can be made even more uniform.

[0066] Similarly, in a cross section parallel to the thickness direction T of the stretchable substrate 10 and intersecting the second electrode 22 and the third electrode 23C, the cross-sectional area A3 of the third electrode 23C is preferably 10% or more of the cross-sectional area A2 of the second electrode 22. The cross-sectional area A3 of the third electrode 23C is more preferably 50% or more of the cross-sectional area A2 of the second electrode 22, and even more preferably 90% or more. If the cross-sectional area A3 of the third electrode 23C is too small, the effect of suppressing migration may decrease. By setting the lower limit of the cross-sectional area A3 of the third electrode 23C as described above, migration that may occur between the first electrode 21 and the second electrode 22 can be effectively suppressed.

[0067] [Fifth embodiment] Hereinafter, a stretchable device 1D according to a fifth embodiment will be described with reference to Fig. 7. Fig. 7 corresponds to the cross section taken along line II-II in Fig. 1. The stretchable device 1D is different from the stretchable device 1 according to the first embodiment in the positional relationship between the first electrode, the second electrode, the insulating layer, and the third electrode.

[0068] The first electrode 21 and the second electrode 22 are provided on the first main surface 10a of the stretchable base material 10. The insulating layer 30 is provided on the first main surface 10a of the stretchable base material 10 so as to cover the first electrode 21 and the second electrode 22. The third electrode 23 is provided on a surface 30a of the insulating layer 30 opposite to the first main surface 10a of the stretchable base material 10. In this embodiment, the position at which the third electrode 23 is provided is not particularly limited, and for example, the third electrode 23 may be provided below the first electrode 21 and the second electrode 22.

[0069] According to the above configuration, since the first electrode 21 and the second electrode 22 are covered with the insulating layer 30, the first electrode 21 and the second electrode 22 can be protected from moisture that may infiltrate from the upper side of the stretchable base material 10 (the upper side in FIG. 7). In addition, when the third electrode 23 is provided on the surface 30a of the insulating layer 30, the third electrode 23 can hide the patterns of the first electrode 21 and the second electrode 22. In this configuration, the third electrode 23 can also serve as a protective layer for the first electrode 21 and the second electrode 22. For example, the third electrode 23 can serve as a protective layer that suppresses the infiltration of moisture into the stretchable device 1D from the third electrode 23 side (the upper side in FIG. 7).

[0070] [Sixth embodiment] Hereinafter, a stretchable device 1E according to the sixth embodiment will be described with reference to Fig. 8. Fig. 8 corresponds to the cross section taken along line II-II in Fig. 1. The stretchable device 1E is different from the stretchable device 1 according to the first embodiment in that an insulating layer is not provided and the position at which the third electrode is provided.

[0071] The stretchable base material 10 has a first main surface 10a and a second main surface 10b facing each other, the first electrode 21 and the second electrode 22 are provided on the first main surface 10a, and the third electrode 23 is provided on the second main surface 10b. In this embodiment, electrical insulation between the first electrode 21 and the second electrode 22 and the third electrode 23 can be ensured by the stretchable base material 10, so that the insulating layer 30 is not provided.

[0072] According to the above configuration, the manufacturing process can be simplified and the manufacturing cost can be reduced since there is no need to provide the insulating layer 30. Moreover, by adopting a configuration in which the insulating layer 30 is not provided, the overall thickness of the stretchable device 1E can be reduced, and the height of the stretchable device can be further reduced.

[0073] Furthermore, in the above configuration, the shortest distance D1 between the first electrode 21 and the third electrode 23 corresponds to the thickness of the stretchable base material 10. Therefore, by providing the first electrode 21 and the second electrode 22 on one main surface 10a of the stretchable base material 10 and providing the third electrode 23 on the other main surface 10b, the first electrode 21 and the third electrode 23 can be uniformly spaced apart by the same dimension as the thickness of the stretchable base material 10.

[0074] In the above configuration, the third electrode 23 may be a gel electrode. By using the third electrode 23 as a gel electrode, the stretchable device can be easily attached to a living body or the like. In other words, by using the third electrode 23 as a gel electrode, the third electrode 23 can function as an adhesive layer for attaching the stretchable device to a living body or the like. The gel electrode is made of a conductive gel material containing, for example, water, alcohol, a moisturizing agent, an electrolyte, and the like. Examples of such gel materials include hydrogels having adhesive properties.

[0075] [Seventh embodiment] Hereinafter, a stretchable device 1F according to the seventh embodiment will be described with reference to Fig. 9. Fig. 9 corresponds to the cross section taken along line II-II in Fig. 1. The stretchable device 1F is different from the stretchable device 1 according to the first embodiment in that no insulating layer is provided and the position at which the third electrode is provided.

[0076] The first electrode 21, the second electrode 22, and the third electrode 23 are provided on the same plane. Specifically, the third electrode 23 is provided on the first main surface 10a of the stretchable substrate 10, similar to the first electrode 21 and the second electrode 22. The third electrode 23 extends linearly along the extension direction of the first electrode 21. The third electrode 23 is disposed between the first electrode 21 and the second electrode 22. The third electrode 23 is separated from each of the first electrode 21 and the second electrode 22. In this embodiment, since the first electrode 21, the second electrode 22, and the third electrode 23 are provided on the same plane, the insulating layer 30 is not provided.

[0077] According to the above configuration, the manufacturing process can be simplified and the manufacturing cost can be reduced since there is no need to provide the insulating layer 30. Furthermore, since there is no need to provide the insulating layer 30, the stretchable device 1F can be made thinner.

[0078] Furthermore, by disposing the third electrode 23 between the first electrode 21 and the second electrode 22, the third electrode 23 can suitably suppress bleeding of the second electrode 22 during printing from reaching the first electrode 21. In other words, the third electrode 23 can also contribute to suppressing printing bleeding of the second electrode 22. Therefore, according to the above configuration, the distance D2 between the first electrode 21 and the second electrode 22 can be made smaller, and the stretchable device can be made smaller.

[0079] Furthermore, according to the above configuration, the first electrode 21, the second electrode 23, and the third electrode 23 can be arranged by controlling the printing pattern on the first main surface 10a, so that the distance D1 between the first electrode 21 and the third electrode 23, and the distance D2 between the first electrode 21 and the second electrode 22 can be more easily controlled.

[0080] [Eighth embodiment] Hereinafter, a stretchable device 1G according to an eighth embodiment will be described with reference to Fig. 10. Fig. 10 corresponds to the cross section taken along line II-II in Fig. 1. The stretchable device 1G differs from the stretchable device 1 according to the first embodiment in that the first electrode 21 and the second electrode 22 are stacked so as to sandwich the third electrode 23 and the insulating layer 30 therebetween.

[0081] As shown in FIG. 10, the first electrode 21 and the second electrode 22 are laminated with the third electrode 23 sandwiched between them. Specifically, the first electrode 21 is provided on the first main surface 10a of the stretchable base material 10. The insulating layer 30 is provided on the first main surface 10a of the stretchable base material 10 so as to cover the first electrode 21. The third electrode 23 is provided on a surface 23b (hereinafter also referred to as the second surface 23b) side facing the first main surface 10a of the stretchable base material 10 so as to face the first electrode 21 with the insulating layer 30 sandwiched between them. An insulating layer 30 is further provided on a surface 23a (hereinafter also referred to as the first surface 23a) of the third electrode 23 located on the opposite side to the second surface 23b. The second electrode 22 is disposed on the insulating layer 30 located on the first surface 23a. The insulating layers are provided between the first electrode 21 and the third electrode 23, and between the second electrode 22 and the third electrode 23. That is, the third electrode 23 has insulating layers 30 on both sides, that is, the second surface 23b facing the first main surface of the stretchable base material 10 and the first surface 23a opposite to the second surface 23b. In other words, the third electrode 23 is located between the two insulating layers 30. As a result, the stretchable device 1G has a structure in which the first electrode 21, the insulating layer 30, the third electrode 23, the insulating layer 30, and the second electrode 22 are laminated in this order on the stretchable base material 10.

[0082] The arrangement of the first electrode 21 and the second electrode 22 may be reversed. That is, the second electrode 22 may be located between the stretchable substrate 10 and the third electrode 23, and the first electrode 22 may be located on the first surface 23a side of the third electrode.

[0083] According to the above configuration, the first electrode 21 and the second electrode 22 are physically isolated by the third electrode 23, and therefore migration between the first electrode 21 and the second electrode 22 can be more suitably prevented. Furthermore, as described above, the ionization tendency of the conductive material that is the main component of the third electrode 23 is smaller than the ionization tendency of the conductive material that is the main component of the first electrode 21 and the second electrode 22, and therefore ion migration between the first electrode 21 and the third electrode 23 is suppressed. Therefore, with the above configuration, a stretchable device 1G that can suppress the occurrence of migration can be provided.

[0084] Ninth embodiment Hereinafter, a stretchable device 1H according to a ninth embodiment will be described with reference to Figs. 11A to C. Figs. 11A to C respectively correspond to the cross section II-II in Fig. 1. The stretchable device 1H differs from the stretchable device 1 according to the first embodiment in that in addition to the first electrode 21 and the second electrode 22, a fourth electrode 24 and a fifth electrode 25 are further arranged.

[0085] For example, the first electrode 21 and the second electrode 24 are located on the same plane. That is, the first electrode 21 and the second electrode 22 are provided on the first main surface 10a of the stretchable base material 10. The insulating layer 30 is provided on the first main surface 10a of the stretchable base material 10 so as to cover the first electrode 21 and the second electrode 22. The third electrode 23 is provided on the second surface 23b side so as to face the first electrode 21 and the second electrode 22 with the insulating layer 30 in between. The fourth electrode 24 and the fifth electrode 25 are arranged on the insulating layer located on the first surface 23a side of the third electrode 23. The fourth electrode 24 and the fifth electrode 25 may be located on the same plane. That is, the fourth electrode 24 and the fifth electrode 25 are arranged so as to face the first surface 23a of the third electrode 23 through the insulating layer 30. In the stretchable device 1G' having such a configuration, the first electrode 21, the second electrode 22, the fourth electrode 24, and the fifth electrode 25 are laminated with the insulating layer 30 and the third electrode 23 interposed therebetween.

[0086] The ionization tendency of the conductive material that is the main component of the third electrode 23 is smaller than the ionization tendency of the conductive material that is the main component of the fourth electrode 24 and the ionization tendency of the conductive material that is the main component of the fifth electrode 25. For example, the fourth electrode 24 and the fifth electrode 25 can both be silver electrodes, and the third electrode 23 can be a carbon electrode. The ionization tendency of the conductive material that is the main component of the third electrode 23, i.e., carbon, is smaller than the ionization tendency of the conductive material that is the main component of the fourth electrode 24, i.e., silver, and the ionization tendency of the conductive material that is the main component of the fifth electrode 25, i.e., silver.

[0087] Further, the shortest distance D3 between the fourth electrode 24 and the third electrode 23 is smaller than the shortest distance D4 between the fourth electrode 24 and the fifth electrode 25. The shortest distance D3 refers to the minimum value of the distance in the opposing direction between the fourth electrode 24 and the third electrode 23 (in this embodiment, the thickness direction T of the stretchable base material 10). The shortest distance D4 refers to the minimum value of the distance in the opposing direction between the fourth electrode 24 and the fifth electrode 25 (in this embodiment, the left-right direction in FIG. 2). The shortest distance D3 and the shortest distance D4 may be measured in a cross section that is parallel to the thickness direction T of the stretchable base material 10 and intersects with the fourth electrode 24, the fifth electrode 25, and the third electrode 23. In this embodiment, the shortest distance D3 and the shortest distance D4 may be measured, for example, in a cross section that passes through the center of the extension direction of the fourth electrode 24 and is perpendicular to the extension direction of the fourth electrode 24.

[0088] According to the above configuration, since the shortest distance D3 between the fourth electrode 24 and the third electrode 23 is smaller than the shortest distance D4 between the fourth electrode 24 and the fifth electrode 25, the intensity of the electric field formed between the fourth electrode 24 and the third electrode 23 is greater than the intensity of the electric field formed between the fourth electrode 24 and the fifth electrode 25. Therefore, ion migration between the fourth electrode 24 and the fifth electrode 25 is suppressed, and as a result, migration between the fourth electrode 24 and the fifth electrode 25 can be suppressed. Furthermore, since the ionization tendency of the conductive material that is the main component of the third electrode 23 is smaller than the ionization tendency of the conductive material that is the main component of the fourth electrode 24 and the ionization tendency of the conductive material that is the main component of the fifth electrode 25, migration that may occur between the fourth electrode 24 and the third electrode 23 is also suppressed. This makes it possible to suppress migration that may occur in the stretchable device 1.

[0089] That is, according to the above configuration, multiple electrodes can be arranged in a stacked manner while preventing migration between electrodes by the third electrode 23. By forming multiple electrodes in a multi-layered structure, the area of ​​the stretchable device can be reduced compared to a structure in which multiple electrodes are arranged on the same plane. Therefore, a more compact stretchable device can be obtained.

[0090] The polarity of the electric potential of the first to fifth electrodes may be different from the electric potential polarity of the first electrode 21 and the fourth electrode 24, while the second electrode 22, the third electrode 23, and the fifth electrode 25 may be the same. For example, the polarity of the electric potential of the first electrode 21 and the fourth electrode 24 may be negative, and the polarity of the electric potential of the second electrode 22, the third electrode 23, and the fifth electrode 25 may be positive. According to the above configuration, the presence of the third electrode 23 suppresses the movement of metal ions from the second electrode 22 and the fifth electrode 25, which have a positive polarity. Therefore, even in a stacked stretchable device having a plurality of electrodes, the occurrence of migration can be suitably suppressed.

[0091] The arrangements of the first electrode 21, the second electrode 22, the fourth electrode 24, and the fifth electrode 25 shown in FIG. 8 are interchangeable. In short, the first electrode 21, the second electrode 22, the fourth electrode 24, and the fifth electrode 25 are compatible in terms of arrangement. For example, as shown in FIG. 11B, the arrangement of the fourth electrode 24 and the arrangement of the fifth electrode 25 may be reversed compared to the stretchable device 1H in FIG. 11A. That is, electrodes having the same polarity of electric potential may be arranged to face each other across the third electrode 23, or alternatively, electrodes having different polarities of electric potential may be arranged to face each other across the third electrode 23.

[0092] Alternatively, as shown in FIG. 11C, the arrangement of the second electrode 22 and the arrangement of the fourth electrode 24 may be reversed compared to the stretchable device 1H of FIG. 11A. Specifically, the first electrode 21 and the fourth electrode 24, which have the same polarity of potential, may be located on the same plane, and the second electrode 22 and the fifth electrode 25, which have the same polarity of potential, may be located on the same plane on the opposite side of the third electrode 23. In other words, a plurality of electrodes having the same polarity of potential may be arranged on the same plane, and electrodes having different polarities of potential may be arranged to face each other with the third electrode 23 in between. According to this configuration, the third electrode 23 physically blocks the migration path of ions between the first electrode 21 and the second electrode 22 and the fourth electrode 24 and the fifth electrode 25. As a result, the presence of the third electrode 23 prevents ion migration across the third electrode 23, so that the occurrence of migration can be more suitably suppressed.

[0093] It should be noted that each embodiment is merely an example, and the present invention is not limited to each embodiment. Also, each drawing is merely an example of components, and does not limit the shape. Also, partial replacement or combination of the configurations shown in different embodiments is possible.

[0094] <1> A stretchable base material; A first electrode, a second electrode, and a third electrode provided on the stretchable substrate, the ionization tendency of the conductive material that is a main component of the third electrode is smaller than the ionization tendency of the conductive material that is a main component of the first electrode and the ionization tendency of the conductive material that is a main component of the second electrode; A stretchable device, wherein a shortest distance between the first electrode and the third electrode is smaller than a shortest distance between the first electrode and the second electrode. <2> the polarity of the potential of the first electrode is different from the polarity of the potential of the second electrode; the polarity of the potential of the third electrode is different from the polarity of the potential of the first electrode; <1> The stretchable device according to claim 1 . <3> the polarity of the potential of the first electrode is negative; <2> The stretchable device according to claim 1 . <4> The stretchable substrate has a first major surface, the first electrode, the second electrode, and the third electrode are provided on the first main surface; the first electrode and the second electrode are disposed in the same plane; the third electrode is disposed at a position different from the first electrode and the second electrode in a thickness direction of the stretchable base material, Further comprising an insulating layer provided at least between the first electrode and the third electrode and between the second electrode and the third electrode. <1> from <3> 13. The stretchable device according to claim 12, <5> the third electrode, the insulating layer, the first electrode, and the second electrode are laminated in this order from the first principal surface side. <4> The stretchable device according to claim 1 . <6> the insulating layer has a first portion provided between the first electrode and the third electrode and a second portion provided between the second electrode and the third electrode, The first portion and the second portion are spaced apart. <4> or <5> The stretchable device according to claim 1 . <7> the first electrode, the second electrode, the insulating layer, and the third electrode are laminated in this order from the first principal surface side; <4> from <6> 13. The stretchable device according to claim 12, <8> The stretchable base material has a first main surface and a second main surface opposed to each other, the first electrode and the second electrode are provided on the first main surface, The third electrode is provided on the second main surface. <1> from <3> 13. The stretchable device according to claim 12, <9> the third electrode overlaps the entirety of the first electrode when viewed in the thickness direction of the stretchable base material; <1> from <8> 13. The stretchable device according to claim 12, <10> the third electrode overlaps the entire first electrode and the entire second electrode when viewed in the thickness direction of the stretchable base material; <9> The stretchable device according to claim 1 . <11> the third electrode does not overlap the first electrode and the second electrode when viewed in the thickness direction of the stretchable base material; <1> from <8> 13. The stretchable device according to claim 12, <12> In a cross section parallel to a thickness direction of the stretchable base material and intersecting the first electrode and the third electrode, the cross-sectional area of ​​the third electrode is 105% or less of the cross-sectional area of ​​the first electrode. <1> from <11> 13. The stretchable device according to claim 12, <13> the first electrode and the second electrode are stacked with the third electrode sandwiched therebetween, further comprising an insulating layer provided between the first electrode and the third electrode and between the second electrode and the third electrode; <1> from <3> 13. The stretchable device according to claim 12, <14> Further comprising a fourth electrode and a fifth electrode provided on the stretchable substrate; the ionization tendency of the conductive material that is a main component of the third electrode is smaller than the ionization tendency of the conductive material that is a main component of the fourth electrode and the ionization tendency of the conductive material that is a main component of the fifth electrode; the shortest distance between the fourth electrode and the third electrode is smaller than the shortest distance between the fourth electrode and the fifth electrode; <1> from <3> 13. The stretchable device according to claim 12, <15> the polarity of the potential of the first electrode is the same as the polarity of the potential of the fourth electrode; the polarity of the electric potential of the second electrode, the third electrode, and the fifth electrode is different from the polarity of the electric potential of the first electrode and the fourth electrode; <14> The stretchable device according to claim 1 . <16> the first electrode and the second electrode are disposed in the same plane; the fourth electrode and the fifth electrode are disposed in the same plane; the stretchable base material, the first electrode, the second electrode, the third electrode, the fourth electrode, and the fifth electrode are laminated in this order; and an insulating layer provided between the first electrode, the second electrode and the third electrode, and between the fourth electrode, the fifth electrode and the third electrode. <14> or <15> The stretchable device according to claim 1 . <17> the first electrode and the fourth electrode are disposed in the same plane; the second electrode and the fifth electrode are disposed in the same plane; the stretchable base material, the first electrode, the fourth electrode, the third electrode, the second electrode, and the fifth electrode are laminated in this order; and an insulating layer provided between the first electrode and the third electrode, and between the second electrode and the fifth electrode and the third electrode. <14> or <15> The stretchable device according to claim 1 . [Explanation of symbols]

[0095] 1, 1A, 1B, 1C, 1D, 1E, 1F: Stretchable devices 10:Stretchable base material 10a: First main surface 10b: Second main surface 21: 1st electrode 22:Second electrode 23, 23B, 23C: 3rd electrode 231: Part 1 232:Second part 30, 30A: Insulation layer 40:Protective layer A1, A2, A3: Cross-sectional area D1, D2: Shortest distance T: Thickness direction of the stretchable base material

Claims

1. A stretchable base material; A first electrode, a second electrode, and a third electrode provided on the stretchable substrate, the ionization tendency of the conductive material that is a main component of the third electrode is smaller than the ionization tendency of the conductive material that is a main component of the first electrode and the ionization tendency of the conductive material that is a main component of the second electrode; A stretchable device, wherein a shortest distance between the first electrode and the third electrode is smaller than a shortest distance between the first electrode and the second electrode.

2. the polarity of the potential of the first electrode is different from the polarity of the potential of the second electrode; The stretchable device according to claim 1 , wherein a polarity of the electric potential of the third electrode is different from a polarity of the electric potential of the first electrode.

3. The stretchable device according to claim 2 , wherein the polarity of the electric potential of the first electrode is negative.

4. The stretchable substrate has a first major surface, the first electrode, the second electrode, and the third electrode are provided on the first main surface; the first electrode and the second electrode are disposed in the same plane; the third electrode is disposed at a position different from the first electrode and the second electrode in a thickness direction of the stretchable base material; The stretchable device according to claim 1, further comprising an insulating layer provided at least between the first electrode and the third electrode and between the second electrode and the third electrode.

5. The stretchable device according to claim 4, wherein the third electrode, the insulating layer, the first electrode, and the second electrode are stacked in this order from the first principal surface side.

6. the insulating layer has a first portion provided between the first electrode and the third electrode and a second portion provided between the second electrode and the third electrode, The stretchable device of claim 4 , wherein the first portion and the second portion are spaced apart.

7. The stretchable device according to claim 4, wherein the first electrode, the second electrode, the insulating layer, and the third electrode are stacked in this order from the first principal surface side.

8. The stretchable base material has a first main surface and a second main surface opposed to each other, the first electrode and the second electrode are provided on the first main surface, The stretchable device according to claim 1 , wherein the third electrode is provided on the second principal surface.

9. The stretchable device according to claim 1 , wherein the third electrode overlaps with the entirety of the first electrode when viewed in a thickness direction of the stretchable base material.

10. The stretchable device according to claim 9 , wherein the third electrode overlaps with the entire first electrode and the entire second electrode when viewed in a thickness direction of the stretchable base material.

11. The stretchable device according to claim 1 , wherein the third electrode does not overlap with the first electrode and the second electrode when viewed in a thickness direction of the stretchable base material.

12. 2. The stretchable device according to claim 1, wherein in a cross section parallel to a thickness direction of the stretchable base material and intersecting the first electrode and the third electrode, the cross-sectional area of ​​the third electrode is 105% or less of the cross-sectional area of ​​the first electrode.

13. the first electrode and the second electrode are stacked with the third electrode sandwiched therebetween, The stretchable device according to claim 1 , further comprising an insulating layer provided between the first electrode and the third electrode and between the second electrode and the third electrode.

14. Further comprising a fourth electrode and a fifth electrode provided on the stretchable substrate; an ionization tendency of a conductive material that is a main component of the third electrode is smaller than an ionization tendency of a conductive material that is a main component of the fourth electrode and an ionization tendency of a conductive material that is a main component of the fifth electrode; The stretchable device according to claim 1 , wherein a shortest distance between the fourth electrode and the third electrode is smaller than a shortest distance between the fourth electrode and the fifth electrode.

15. the polarity of the potential of the first electrode is the same as the polarity of the potential of the fourth electrode; The stretchable device according to claim 14 , wherein polarities of electric potentials of the second electrode, the third electrode, and the fifth electrode are different from polarities of electric potentials of the first electrode and the fourth electrode.

16. the first electrode and the second electrode are disposed in the same plane; the fourth electrode and the fifth electrode are disposed in the same plane; the stretchable base material, the first electrode, the second electrode, the third electrode, the fourth electrode, and the fifth electrode are laminated in this order; The stretchable device according to claim 14, comprising an insulating layer provided between the first electrode, the second electrode and the third electrode, and between the fourth electrode, the fifth electrode and the third electrode.

17. the first electrode and the fourth electrode are disposed in the same plane; the second electrode and the fifth electrode are disposed in the same plane; the stretchable base material, the first electrode, the fourth electrode, the third electrode, the second electrode, and the fifth electrode are laminated in this order; The stretchable device according to claim 14, comprising an insulating layer provided between the first electrode, the fourth electrode and the third electrode, and between the second electrode, the fifth electrode and the third electrode.

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