WO2024004590A1

WO2024004590A1 - Stretchable device

Info

Publication number: WO2024004590A1
Application number: PCT/JP2023/021562
Authority: WO
Inventors: 遼浅井; 圭佑西田; 勇人勝
Original assignee: 株式会社村田製作所
Priority date: 2022-06-28
Filing date: 2023-06-09
Publication date: 2024-01-04

Abstract

Provided is a stretchable device comprising a stretchable base material, a stretchable wiring provided on the stretchable base material, and an adhesive layer having portions which are separated from and facing each other. The stretchable wiring is located between the portions, of the adhesive layer, separated from and facing each other, when viewed from the thickness direction of the stretchable base material.

Description

stretchable device

The present disclosure relates to stretchable devices.

Stretchable devices in which stretchable wiring is mounted on a stretchable base material have been known for some time. This stretchable device can be used by being worn on the human body.

Patent Document 1 describes a stretchable device in which an adhesive layer for mounting on a mounting target is attached over the mounting surface of a stretchable base material. In such a stretchable device, a mounting adhesive layer is formed over one surface of a stretchable base material.

JP 2021-64676 Publication

As in Patent Document 1, when the mounting adhesive layer is formed on the entire surface of the stretchable base material located on the mounting body side, the stretchable base material is integrated with the mounting adhesive layer. Therefore, the stretchable base material and the mounting adhesive layer can deform integrally following the movement of the mounted object. In response to such deformation, when stress such as tension or twisting is applied to the stretchable wiring arranged on the stretchable base material, the resistance value of the stretchable wiring changes, and the resistance value delivered by the stretchable wiring changes. There is a possibility that an error may occur in the signal.

The present disclosure has been made in view of such problems. That is, the main objective of the present disclosure is to provide a stretchable device that can suppress changes in the resistance value of stretchable wiring caused by deformation of the stretchable device.

In order to achieve the above object, in one embodiment of the present disclosure,
comprising a stretchable base material, stretchable wiring provided on the stretchable base material, and an adhesive layer having portions facing each other and separated from each other,
A stretchable device is provided, in which the stretchable wiring is located between mutually spaced and opposing portions of the adhesive layer when viewed from the thickness direction of the stretchable base material.

According to the stretchable device according to an embodiment of the present disclosure, it is possible to suppress a change in the resistance value of the stretchable wiring due to deformation of the stretchable device.

FIG. 1 is a top view schematically showing a stretchable device according to a first embodiment of the present disclosure. FIG. 2 is a cross-sectional view taken along line AA of the stretchable device shown in FIG. FIG. 3 is a schematic top view showing the entire stretchable device according to the first embodiment of the present disclosure. FIG. 4 is a schematic cross-sectional view of a stretchable device according to a first modification of the first embodiment of the present disclosure. FIG. 5 is a schematic cross-sectional view of a stretchable device according to a second modification of the first embodiment of the present disclosure. FIG. 6 is a schematic plan view of a stretchable device according to a third modification of the first embodiment of the present disclosure. FIG. 7 is a top view schematically showing a stretchable device according to a second embodiment of the present disclosure. FIG. 8 is a sectional view taken along line BB of the stretchable device shown in FIG. FIG. 9 is a schematic cross-sectional view of a stretchable device according to a modification of the second embodiment of the present disclosure. FIG. 10 is a schematic cross-sectional view of a stretchable device according to a modification of the second embodiment of the present disclosure.

Hereinafter, embodiments of the present disclosure will be described in detail using the drawings. In each embodiment, points different from those described before the embodiment will be mainly described. In particular, similar effects due to similar configurations will not be mentioned for each embodiment. Among the components in the following embodiments, components that are not described in the independent claims will be described as arbitrary components. Further, the sizes and size ratios of the components shown in the drawings are not necessarily exact. Further, in each figure, substantially the same configurations are denoted by the same reference numerals, and overlapping explanations may be omitted or simplified.

As used herein, the term "cross-sectional view" or "cross-sectional shape" refers to a shape viewed from a direction substantially perpendicular to the thickness direction of the stretchable device (in short, a shape parallel to the thickness direction of the stretchable device). It is based on the shape of the surface when cut out. Furthermore, the term "planar view" as used herein is based on a sketch when the object is viewed from above or below along the thickness direction of the stretchable device.

Furthermore, in this specification, "on" an element includes not only the case of contacting the upper surface of the element, but also the case of not contacting the upper surface of the element. In other words, "above" an element means not only a position above and away from the element, that is, a position above the element via another object, or a position above the element with a space between them. This includes the position directly above the contact. Moreover, "above" does not necessarily mean the upper side in the vertical direction. "Above" merely indicates the relative positional relationship of certain elements.

[First embodiment]
The structure of the stretchable device will be described with reference to FIGS. 1 and 2. FIG. 1 is a top view schematically showing a stretchable device 100 according to a first embodiment of the present disclosure. FIG. 2 is a cross-sectional view of the stretchable device of FIG. 1 along line AA. Note that the cross-sectional views in this specification are perpendicular to the extending direction of the stretchable wiring. In actual comparison, confirmation can be made using the above-mentioned cross-sectional view at an arbitrary position of the stretchable wiring extending in one direction.

In the stretchable device 100, stretchable wiring 20 is routed on the main surface of the stretchable base material 10. Note that the shape of the stretchable device 100 is not particularly limited. In FIG. 1, the stretching direction of the stretchable wiring 20 and the longitudinal direction of the stretchable device 100 match, but they do not necessarily have to match. Further, in FIG. 1, for clarity, only the wiring extending in a specific direction is shown, but the stretchable wiring 20 does not have to extend in one direction.

The stretchable device 100 includes a stretchable base material 10 having a first major surface 11 and a second major surface 12 located on the opposite side of the first major surface 11, and a stretchable base material 10 provided on the major surface of the stretchable base material 10. The elastic wiring 20 and the adhesive layer 30 that can be attached to an adherend 200 that contributes to the mounting of the elastic device 100 are provided. "Top" in this specification refers to the first main surface 11 side in the thickness direction X of the stretchable base material, and "bottom" in this specification refers to the side of the stretchable base material in the thickness direction X This refers to the second main surface 12 side. These directions do not have to correspond to the top and bottom when the stretchable device 100 is used. Moreover, the "outside" in this specification refers to the side relatively far from the stretchable base material 10, and similarly does not have to coincide with the outside during actual use.

In addition, the term "adherent" in this specification refers to a counterpart to which a stretchable device is attached, and can also be referred to as an adherend, an attached object, a mounted object, or the like. For example, the adherend can be a living body.

Hereinafter, the arrangement of these components will be explained with reference to FIGS. 1 and 2. As shown in FIGS. 1 and 2, stretchable wiring 20 is provided on the first main surface 11 of the stretchable base material, and an adhesive layer 30 is provided on the second main surface 12 side.

(Stretchable base material 10)
The stretchable base material 10 is a sheet-like or film-like stretchable base material, and is made of, for example, a stretchable resin material. Here, in this specification, elasticity simply means the property of being able to expand and contract, and can also be referred to as stretchability, stretchable property, etc. More specifically, it refers to the property of being able to stretch from the normal non-stretched state without any tensile stress applied, by applying tensile stress, and contracting when released from the stretched state. . Examples of the resin material include thermoplastic polyurethane. The thickness of the stretchable base material 10 is not particularly limited, but from the viewpoint of not inhibiting the expansion and contraction of the surface of the adherend 200 when attached to the adherend 200 such as a living body, it is preferably 1 mm or less, and the thickness is preferably 100 μm. It is more preferable that it is below, and even more preferably that it is 50 μm or less. Moreover, it is preferable that the thickness of the stretchable base material is 1 μm or more.

(Stretchable wiring 20)
The stretchable wiring 20 contains conductive particles and resin. Examples of the stretchable wiring 20 include a mixture of conductive particles such as metal powder such as Ag (silver), Cu (copper), and Ni (nickel) and an elastomer resin such as silicone resin. The average particle size of the conductive particles is not particularly limited, but is preferably 0.01 μm or more and 10 μm or less. Further, the shape of the conductive particles is preferably spherical.

The thickness of the stretchable wiring 20 is not particularly limited, but is preferably 100 μm or less, more preferably 50 μm or less. Moreover, it is preferable that the thickness of the stretchable wiring 20 is 0.01 μm or more. Although the line width of the stretchable wiring 20 is not particularly limited, it is preferably 0.1 μm or more, and more preferably 10 mm or less. Moreover, the cross-sectional shape, planar view shape, and number of the expandable wiring are not particularly limited.

(Adhesive layer 30)
The adhesive layer 30 has adhesiveness that allows the stretchable device 100 to be attached to the adherend 200. The adhesive layer 30 includes a base material side main surface 31 located on the elastic base material 10 side and an adherend side main surface 32 located on the adherend 200 side. The stretchable device 100 is mounted so as to be bonded to the adherend 200 at the adherend-side main surface 32 of the adhesive layer 30, and the adherend-side main surface 32 is a mounting surface, a pasting surface, or a mounting surface. It can also be called. It is preferable that the adhesive layer 30 has adhesiveness on both main surfaces. That is, the adhesive layer 30 may have adhesiveness not only on the attachment surface 32 to the adherend 200 but also on the main surface 31 on the base material side.

The main surface 32 of the adhesive layer on the adherend side can be attached to a living body. Therefore, the adhesive layer 30 can be made of various types of adhesives without any particular restrictions, as long as they are non-irritating to the skin, have sufficient pressure-sensitive adhesiveness, and can be easily peeled off from the skin after use. agents can be used. Further, from the viewpoint of ability to follow the shape and movement of the surface of a living body, it is preferable that the adhesive layer 30 has excellent stretchability and flexibility. Although this is just an example, examples of the material for the adhesive layer 30 include synthetic rubber adhesives, acrylic adhesives, urethane adhesives, natural rubber adhesives, silicone adhesives, etc. A synthetic rubber adhesive is more preferred.

(Characteristics of the first embodiment)
Based on the contents of the main components of the stretchable device described above, the features of the first embodiment will be described below. As shown in FIGS. 1 and 2, in the stretchable device 100 according to the first embodiment of the present disclosure, one or more adhesive layers 30 that can be attached to an adherend are arranged in the thickness direction X of the stretchable base material. It includes portions that face each other and are spaced apart from each other when viewed from above. That is, the stretchable device 100 may include one or more adhesive layers 30, and the adhesive layers 30 may be arranged so as to include portions facing each other and separated from each other. The adhesive layer 30 does not need to be provided over the entire second main surface 12 side of the stretchable base material. This can also be understood as the stretchable device 100 comprising a region provided with the adhesive layer 30 and a region not provided with the adhesive layer 30 on the second main surface 12 side of the stretchable base material.

When viewed from the thickness direction X of the stretchable base material, the stretchable wiring 20 is located between the portions where the adhesive layers 30 face each other and are separated from each other. In other words, when viewed from the thickness direction X of the stretchable base material, the adhesive layer 30 may be arranged so as to have portions facing each other and separated from each other with the stretchable wiring 20 interposed therebetween. In such a structure, when viewed from the thickness direction X of the stretchable base material, the stretchable wiring 20 is arranged so as to overlap with a region where the adhesive layer 30 is not provided. In other words, the adhesive layer 30 is disposed at least at a position that does not overlap with the outer main surface 21 of the stretchable wiring 20 facing the stretchable base material 10 . Such a structure can also be understood to mean that the stretchable wiring 20 and the adhesive layer 30 are arranged offset from each other when viewed from the thickness direction X of the stretchable base material. In addition, in this specification, "the outer main surface 21 of the stretchable wiring 20 facing the stretchable base material 10" means a surface located on the distal side with respect to the stretchable base material 10. For example, as shown in FIG. 2, the "outer main surface 21 of the stretchable wiring facing the stretchable base material" is the opposite side to the main surface of the stretchable wire 20 facing the stretchable base material 10. It is a surface located at .

From another perspective, the stretchable device 100 includes a first overlapping region 51 including the adhesive layer 30 and a second overlapping region 52 including the stretchable wiring 20, as shown in FIG. Specifically, when viewed from the thickness direction A second overlapping region 52 is provided in which the flexible wiring 20 and the adhesive layer 30 do not overlap with each other. The second overlapping region 52 where the adhesive layer 30 is not provided may be located between the portions where the adhesive layer 30 faces each other and is spaced apart from each other. That is, the stretchable device 100 includes the adhesive layer 30 in the first overlapping region 51 , but does not include the adhesive layer 30 in the second overlapping region 52 . For this reason, for example, the first overlapping region 51 can be referred to as the "adhesive layer existing region", and the second overlapping region 52 can also be referred to as the "adhesive layer absent region" or "wiring region in the absence of the adhesive layer". . Therefore, in a cross-sectional view, the adhesive layer 30 is not substantially interposed between the stretchable wire 20 and the adherend 200 in the second overlapping region 52 including the stretchable wire 20 .

In the first overlapping region 51, the elastic base material 10 is adhered to the adherend 200 by the adhesive layer 30. Therefore, the stretchable base material 10 in the first overlapping region 51 easily follows the shape and movement of the adherend 200 via the adhesive layer 30, and the stretchable base material 10 is wrinkled, bent, distorted, and/or bent. Such deformations may occur. On the other hand, in the second overlapping region 52, the adhesive layer 30 is not located between the stretchable base material 10 and the adherend 200 in cross-sectional view. Therefore, in the second overlapping region, deformation of the stretchable base material 10 that follows the shape and movement of the adherend 200 can be suppressed. That is, the portion of the stretchable base material 10 that does not overlap with the adhesive layer 30 is less likely to deform than the portion that overlaps with the adhesive layer 30. Note that "deformation" as used herein means wrinkles, deflections, bends, curves, distortions, and/or bends, etc. that occur due to the shape and/or movement of the adherend. By suppressing the deformation of the stretchable base material 10, the deformation of the stretchable wiring 20 provided on the stretchable base material 10 is also suppressed, so that a change in the resistance value of the stretchable wiring 20 can be suppressed. In other words, the stretchable device 100 of the present disclosure has a configuration in which the adhesive layer 30 is not provided at a position overlapping the stretchable wire 20 in the thickness direction X, thereby indirectly suppressing deformation of the stretchable wire 20. It can be achieved. When the change in resistance of the stretchable wiring is suppressed by suppressing deformation, errors in signals delivered by the stretchable wiring are reduced, and a highly accurate stretchable device can be provided.

Furthermore, suppressing deformation of the stretchable wiring can also contribute to suppressing local concentration of stress due to bending of the stretchable wiring. In other words, the above structure reduces the stress caused by the deformation of the stretchable wiring, thereby suppressing the occurrence of physical damage such as disconnection of the stretchable wiring, and increasing the durability of the stretchable device. can contribute.

Furthermore, according to such a configuration, deformation of the stretchable base material 10 and the stretchable wiring 20 in the second overlapping region 52 can be suppressed, while the stretchable base material 10 and the adhesive layer 30 are prevented from deforming in the thickness direction X. In the first overlapping region 51 where they overlap each other, the elastic base material 10 and the adhesive layer 30 can suitably expand and contract according to the shape and movement of the adherend 200. That is, in the stretchable device of the present disclosure, it may be possible to suppress deformation of the stretchable wiring 20 without impairing the stretchability of the stretchable base material 10 and the adhesive layer 30. This means that deformation of the stretchable wiring 20 can be suppressed without reinforcing the stretchable wiring 20 by using a stretchable base material with a larger elastic modulus and/or the adhesive layer 30. Therefore, the present disclosure provides a stretchable device that has stretchability that can suitably follow the shape and movement of the adherend 200, and that can suppress changes in resistance and disconnection caused by deformation of the stretchable wiring. can be provided.

Furthermore, as shown in FIG. 1, the adhesive layer 30 may be disposed apart from the stretchable wiring 20 when viewed from the thickness direction X of the stretchable base material. That is, when viewed from the thickness direction X, a predetermined interval may be formed between the adhesive layer 30 and the stretchable wiring 20. Due to this spacing, when viewed from the thickness direction That is, the adhesive layer 30 does not need to be disposed in the second overlapping region 52 that overlaps with the stretchable wiring 20 when viewed from the thickness direction X, and around the region.

According to such a structure, the stretchable device 100 is arranged not only in the region overlapping with the stretchable wiring 20 when viewed from the thickness direction X of the stretchable base material, but also in the surrounding region so as not to overlap with the adhesive layer 30. It is configured. Therefore, even in the stretchable base material 10 located near the stretchable wiring 20, deformation following the adhesive layer 30 can be suppressed. Therefore, by making it possible to more appropriately suppress stress caused by movement of the adherend 200 from being applied to the stretchable wiring, changes in resistance value due to deformation of the stretchable wiring can be suppressed.

In this embodiment, as shown in FIGS. 1 and 2, it is assumed that one stretchable wiring 20 is disposed, but the present invention is not limited to this, and two or more The stretchable wiring 20 may extend in any direction on the stretchable base material 10. In such a structure, the adhesive layer 30 can be positioned between the plurality of stretchable wirings 20 when viewed from the thickness direction X of the stretchable base material. That is, a plurality of second overlapping regions 52 may exist. Similarly, the number of adhesive layers 30 and first overlapping regions 51 is not limited either.

FIG. 3 is a top view schematically showing the overall structure of the stretchable device 100 according to the first embodiment. As illustrated, the adhesive layer 30 may be positioned at least at the periphery of the stretchable base material 10 when viewed from the thickness direction X. That is, when viewed from the thickness direction X of the stretchable base material, the adhesive layer 30 may be arranged so as to overlap the outline portion (or outer edge) of the stretchable base material 10. In one preferred embodiment, one continuous adhesive layer 30 may be provided along the periphery of the stretchable substrate 10. Alternatively, two or more adhesive layers 30 may be provided intermittently along the periphery of the stretchable base material 10.

Viewed from the thickness direction X of the stretchable base material, the stretchable wiring 20 may be positioned in a region 15 surrounded by the adhesive layer 30 on the stretchable base material 10. As shown in FIG. 3 , region 15 is a main surface area of stretchable base material 10 defined by adhesive layer 30 disposed along the periphery of stretchable base material 10 . It should be noted that in FIG. 3, the stretchable wiring 20 that may be placed within the region 15 is omitted. For example, one or more stretchable wirings 20 may be arranged in the region 15 surrounded by the adhesive layer 30. The stretchable wiring 20 may be surrounded by one continuous adhesive layer 30 when viewed from the thickness direction X. That is, the adhesive layer 30 may have a frame-like shape in plan view surrounding the stretchable wiring 20. Further, in the region 15, an additional adhesive layer 30 may be provided at a position that does not overlap with the stretchable wiring 20 when viewed from the thickness direction X.

According to such a structure, the stretchable device 100 is mounted on the adherend 200 by the adhesive layer 30 provided over the periphery. That is, the stretchable device 100 can be joined to the adherend 200 at the periphery of the stretchable device. Therefore, in the stretchable base material 10 located in the region 15 surrounded by the adhesive layer 30, deformation due to movement of the adherend 200 can be suitably suppressed. Therefore, the stress that can be applied to the stretchable wiring 20 due to such deformation is reduced, and a change in the resistance value of the stretchable wiring 20 can be suitably suppressed.

Furthermore, when the stretchable device is used, the peripheral edge of the stretchable device 100 is fixed to the adherend 200 by the adhesive layer 30, so that loosening and peeling of the stretchable device as a whole can be suitably suppressed. Therefore, the above-described structure can provide a stretchable device that suppresses deformation of the stretchable wiring 20 and also has excellent holding power to the adherend 200.

The adhesive layer 30 may have a band-like shape in plan view. For example, a strip-shaped adhesive layer 30 may be disposed along the periphery of the stretchable device 100. The width of the adhesive layer 30, as viewed from the thickness direction X of the stretchable base material 10, is preferably 0.3 mm or more, more preferably 0.5 mm or more. When focusing on the holding power of the elastic device to the adherend 200, the width of the adhesive layer 30 is preferably 1 mm or more, 1.5 mm or more, or 2 mm or more. Further, the width of the adhesive layer 30 is preferably 30 mm or less, 20 mm or less, or 15 mm or less. Note that the above numerical range may be changed as appropriate depending on the dimensions of the stretchable device.

[First modification of the first embodiment]
FIG. 4 is a cross-sectional view schematically showing a stretchable device 101 according to a first modification of the first embodiment. A first modification of the first embodiment will be described with reference to FIG. 4. The stretchable device 101 is different from the stretchable device 100 according to the first embodiment in the arrangement of the stretchable wiring 20.

As illustrated, the stretchable wiring 20 may be positioned on the second main surface 12 side of the stretchable base material. That is, the stretchable wiring 20 may be arranged on the second main surface 12 side of the main surface of the stretchable base material 10, which is located on the proximal side with respect to the adherend 200. In such a configuration, the stretchable wiring 20 is located on the same main surface side as the adhesive layer 30. Therefore, both the stretchable wiring 20 and the adhesive layer 30 may be arranged on the second main surface 12 side of the stretchable base material.

In the cross-sectional view shown in FIG. 4, the adhesive layer 30 is configured not to be interposed between the stretchable wiring 20 and the adherend 200. The adhesive layer 30 may be positioned on the second main surface 12 side of the stretchable base material in an area where the stretchable wiring 20 is not arranged. As a result, the stress applied to the elastic wiring 20 due to the movement of the adherend 200 is reduced, and changes in the resistance value and disconnection of the elastic wiring 20 can be suitably suppressed.

Furthermore, according to the above configuration, the thickness of the stretchable device 101 can be reduced as a whole compared to a configuration in which the stretchable wiring 20 is provided on the first main surface 11 side of the stretchable base material. That is, by providing the stretchable wiring 20 and the adhesive layer 30 on the same main surface side of the stretchable base material 10, the height of the stretchable device 101 as a whole can be reduced in the thickness direction X. Thereby, for example, when the adherend 200 is a living body, the discomfort felt when wearing the stretchable device can be reduced.

In addition, the stretchable device is also required to be able to be reattached to the adherend 200 in consideration of the case where it is attached again. When the adhesive layer 30 is provided between the elastic wiring 20 and the adherend 200, when the elastic device is peeled off from the adherend 200, the elastic wiring 20 is pulled by the adhesive layer 30, and the elastic wiring Problems such as peeling and disconnection of the wire 20 may occur. On the other hand, according to the structure of the present disclosure, the stretchable wiring 20 is not attached to the adherend 200 by the adhesive layer 30. Therefore, when the stretchable device 101 is peeled off from the adherend 200, stress such as tension due to the adhesive layer 30 is less likely to be applied to the stretchable wiring 20, so it is preferable that peeling or disconnection of the stretchable wiring 20 occur. can be suppressed.

Additionally, in general, the stretchable device 101 may be mounted on the adherend 200 in order to obtain and/or analyze information on the adherend 200 by electrical signals delivered through the stretchable wiring 20. By positioning the stretchable wiring 20 on the second main surface 12 side of the stretchable base material, the stretchable wiring 20 can be located closer to the adherend 200. Therefore, when the stretchable device is mounted on the adherend 200, the stretchable wiring 20 and electronic components such as sensors connected to the stretchable wiring 20 can be placed closer to the adherend 200. can. Thereby, the stretchable device of the present disclosure may be able to acquire information about the adherend 200 more precisely. That is, according to the above-described structure, a stretchable device with higher precision can be provided.

Furthermore, the thickness of the adhesive layer 30 may be greater than that of the stretchable wiring 20 located on the same main surface side. For example, as shown in FIG. 4, the adhesive layer 30 disposed to include mutually spaced apart portions may have a greater thickness than the stretchable wiring 20 disposed between the spaced apart portions. According to this configuration, when the stretchable device is attached to the adherend 200, the gap 40 is formed between the stretchable wiring 20 and the adherend 200. The adhesive layers 30 may be arranged so as to be spaced apart from each other with the gap 40 interposed therebetween.

For example, when a stretchable device is mounted on the skin of a living body, the skin surface may become wet due to sweating or the like. If moisture intrudes into the stretchable wiring 20, ion migration may occur and the wiring may be short-circuited. By providing the void 40, the above-described stretchable device 101 can be mounted on the adherend 200 without direct contact between the stretchable wiring 20 and the adherend 200. Therefore, since moisture is prevented from adhering to the stretchable wiring 20, the reliability of the stretchable wiring 20 can be improved.

Furthermore, according to the above-described structure, the stretchable device 101 is not bonded to the adherend 200 over the entire surface, and is not in contact with the adherend 200 in the portion where the gap 40 is formed. can. Therefore, since the contact area between the stretchable device and the body to be worn is reduced, when the stretchable device is attached to a living body, irritation to the skin due to contact with the stretchable device can be reduced. The above-described structure with voids 40 may also contribute to improved breathability between the stretchable device and the skin.

For example, the thickness of the adhesive layer 30 is preferably 110% or more, more preferably 150% or more, and even more preferably 200% or more of the thickness of the stretchable wiring 20. When the thickness of the stretchable wiring 20 is within the above range, a suitable stretchable device with improved reliability of the stretchable wiring 20 can be obtained. Further, from the viewpoint of not inhibiting the movement of the adherend 200 when attached to the adherend 200 such as a living body, the thickness of the adhesive layer 30 is preferably 500% or less of the thickness of the elastic wiring 20. , more preferably 400% or less, and still more preferably 300% or less.

[Second modification of the first embodiment]
FIG. 5 is a cross-sectional view schematically showing a stretchable device 102 according to a second modification of the first embodiment. A second modification of the first embodiment will be described with reference to FIG. 5. The stretchable device 102 is different from the stretchable device 100 according to the first embodiment in the relative arrangement of the stretchable wiring 20 and the adhesive layer 30.

As illustrated, the adhesive layer 30 and at least a portion of the edge portion 25 of the stretchable wiring 20 may overlap each other when viewed from the thickness direction X of the stretchable base material. Note that the term "end edge of the stretchable wiring" in this specification refers to the surface of the outer surface of the stretchable wiring 20 that is located on the proximal side with respect to the stretchable base material 10 in a cross-sectional view. It includes an edge including the side surface 23 extending in the stretching direction of the stretchable wiring 20 and an edge including the end face extending in the width direction of the stretchable wiring 20. When viewed from the thickness direction X of the stretchable base material, the adhesive layer 30 may be arranged so as to at least partially overlap the end edge portion 25 of the stretchable wiring. Specifically, the adhesive layer 30 does not overlap with the outer main surface 21 of the stretchable wiring 20 when viewed from the thickness direction It may be configured as follows.

For example, the adhesive layer 30 may be in contact with the edge portion 25 of the stretchable wiring. In other words, the first overlapping region 51 including the adhesive layer 30 and the second overlapping region 52 including the stretchable wiring 20 may be in contact with each other. As shown in FIG. 5, when the cross-sectional shape of the outer surface of the stretchable wiring 20 includes a curved surface, the portion of the outer surface of the stretchable wire 20 located on the proximal side with respect to the stretchable base material 10 may be in contact with the adhesive layer 30. Alternatively, when the stretchable wiring 20 has a rectangular cross-sectional shape, at least a part of the side surface 23 of the stretchable wiring extending along the thickness direction X of the stretchable base material is formed with the adhesive layer 30. It may be close to each other. For example, although the stretchable wiring 20 having a rectangular cross-sectional shape shown in FIG. You can leave it there.

According to such a configuration, the area of the adhesive layer 30 that contributes to bonding the stretchable device 102 and the adherend 200 is further expanded. Therefore, the adhesive strength of the stretchable device 102 can be improved as a whole. Thereby, the stretchable device can be affixed to the adherend 200 and suitably held in a state of being appropriately joined to the adherend 200.

[Third modification of first embodiment]
FIG. 6 is a cross-sectional view schematically showing a stretchable device 103 according to a third modification of the first embodiment. A third modification of the first embodiment will be described with reference to FIG. 6. The stretchable device 103 is different from the stretchable device 102 according to the first embodiment in that it includes a covering layer 60 for the stretchable wiring 20.

The stretchable wiring 20 may be covered with a covering layer 60. For example, the covering layer 60 may cover the outer surface of the stretchable wiring 20. In addition, the "outside" in this specification refers to the side relatively far from the stretchable base material 10, and does not have to correspond to the outside during actual use. The covering layer 60 may cover the outermost surface of the stretchable wiring 20. Note that in the stretchable device, the stretchable wiring 20 only needs to be covered so that the stretchable wiring 20 is not exposed, and a portion thereof may be covered with another member different from the covering layer 60.

By arranging the covering layer 60, it is possible to suppress moisture from entering the stretchable wiring 20 from the outside. The covering layer 60 preferably covers the outer main surface 21 of the stretchable wiring 20, and more preferably covers the side surface 23. That is, the covering layer 60 may be in contact with the outer main surface 21 and side surface 23 of the stretchable wiring 20. By covering each outer surface of the stretchable wiring 20 with the covering layer 60, contact between the stretchable wiring 20 and the adherend 200 can be prevented. Furthermore, the covering layer 60 covering the stretchable wiring 20 may be in contact with the stretchable base material 10. Thereby, infiltration of moisture from the outside into the stretchable wiring 20 can be more suitably suppressed. That is, according to such a structure, occurrence of ion migration due to moisture infiltration into the stretchable wiring 20 is suppressed, and a stretchable device having higher connection reliability can be provided.

It is more preferable that the covering layer 60 covers at least the entire main surface of the stretchable wiring 20 and the stretchable base material 10 on which the stretchable wiring 20 is provided. That is, the covering layer 60 may integrally cover the main surface of the stretchable wiring 20 and the stretchable base material 10 including the stretchable wiring 20. Note that the "whole" of the main surface of the stretchable base material 10 refers to a region that may come into contact with an adherend when the main surface is exposed. For example, there may be a region where the covering layer 60 is not disposed, such as in a portion where the stretchable wiring 20 is connected to an electronic component and/or other wiring. Alternatively, the covering layer covers the main surface of the stretchable base material 10 and all parts that may be arranged on the main surface, including the stretchable wiring 20, the parts connected to electronic components and/or other wiring. It may be placed so as to cover the element.

In another embodiment, the covering layer 60 may be arranged between the stretchable base material 10 and the stretchable wiring 20. In other words, the surface of the stretchable wiring 20 closest to the stretchable base material 10 may be in contact with the covering layer 60 . The entire surface of the stretchable wiring 20 may be covered with the covering layer 60. In this way, by disposing the covering layer 60 between the stretchable base material 10 and the stretchable wiring 20, the moisture that permeates through the stretchable base material 10 or the moisture absorbed by the stretchable base material 10 is prevented. Infiltration into the stretchable wiring 20 can be suppressed. Therefore, according to the above-described configuration, a stretchable device in which ion migration of the stretchable wiring 20 is more suitably suppressed can be provided.

Furthermore, in such a configuration, the covering layer 60 does not necessarily need to be formed of a single layer, and may be formed of two or more covering layers. For example, the stretchable wiring 20 is formed by a first covering layer interposed between the stretchable base material 10 and the stretchable wiring 20, and a second covering layer covering the outer surface (21, 23) of the stretchable wiring 20. It's okay to be surrounded.

As shown in FIG. 6, the adhesive layer 30 may be provided on the covering layer 60. In a preferred embodiment, the covering layer 60 is provided over the second main surface 12 of the stretchable base material on which the stretchable wiring 20 is located, and the adhesive layer 30 is provided on the second main surface 12 of the stretchable base material through the covering layer 60. 2 is arranged on the main surface 12. That is, the covering layer 60 may be located between the stretchable base material 10 and the adhesive layer 30 in a cross-sectional view.

According to this configuration, the stretchable base material 10 can be protected by the covering layer 60. This can suppress damage to the stretchable base material 10 due to stress generated when the stretchable device is peeled off from the adherend in order to reattach the stretchable device. Furthermore, even when the edge portion 25 of the stretchable wiring and the adhesive layer 30 overlap each other when viewed from the thickness direction X, the stretchable wiring 20 and the adhesive layer 30 are not in direct contact with each other. , it is possible to suitably avoid problems such as damage to the stretchable wiring 20 during the peeling operation of the stretchable device.

The coating layer 60 is made of, for example, a resin material or a mixture containing a resin material and an inorganic material. For example, resin materials include urethane-based, styrene-based, olefin-based, silicone-based, fluorine-based, nitrile rubber, latex rubber, vinyl chloride, ester-based, amide-based elastomer resins, epoxy, phenol, acrylic, polyester, etc. Examples include imide-based, rosin, cellulose, polyethylene terephthalate-based, polyethylene naphthalate-based, and polycarbonate-based resins. Note that the covering layer 60 does not need to be made of a single material. Further, the resin material may be a UV curing resin that cures by absorbing ultraviolet light. The UV curing resin may be, for example, an acrylic resin material containing a UV curing agent.

The thickness of the coating layer 60 is not particularly limited, but is preferably 100 μm or less, more preferably 80 μm or less, and even more preferably 50 μm or less. Moreover, it is preferable that the thickness of the coating layer 60 is 1 μm or more.

Hereinafter, a method for manufacturing the stretchable device 100 according to the first embodiment (corresponding to the basic embodiment) will be described.

First, the stretchable base material 10 is prepared. After preparing the stretchable base material 10, the stretchable wiring 20 is formed on the first main surface 11 or the second main surface 12 of the stretchable base material 10. After forming the stretchable wiring 20, the adhesive layer 30 is disposed at a position that does not overlap with the outer main surface 21 of the stretchable wiring when viewed from the thickness direction X of the stretchable base material. For example, one continuous adhesive layer 30 is placed along the periphery of the stretchable substrate 10.

Through the above steps, the stretchable device 100 according to the first embodiment (corresponding to the basic embodiment) can be manufactured.

In addition, when producing the stretchable device of the third modification of the first embodiment, after forming the stretchable wiring 20 on the second main surface 12 of the stretchable base material, the stretchable wiring 20 and the stretchable base material are A coating layer 60 is formed to integrally cover the second main surface 12. After forming the covering layer 60, the adhesive layer 30 is placed on the covering layer 60 at a position that does not overlap with the outer main surface 21 of the stretchable wiring when viewed from the thickness direction X of the stretchable base material. Through the above steps, the stretchable device 100 according to the third modification of the first embodiment can be manufactured.

Furthermore, when producing the stretchable device of the second embodiment described later, a step of arranging an electronic component 70 described later is included before the step of arranging the adhesive layer 30 (see FIGS. 7 and 8). Specifically, after forming the stretchable wiring 20 on the second main surface 12 of the stretchable base material, the electronic component 70 is placed on the second main surface 12 and electrically connected to the stretchable wiring 20. Thereafter, the adhesive layer 30 is placed not only on the stretchable base material 10 and/or the covering layer 60 but also on the electronic component 70 . Through the above steps, the stretchable device according to the second embodiment can be manufactured.

Furthermore, when producing a stretchable device according to a modification of the second embodiment described later, after the electronic component 70 is placed, the electronic component 70 is covered with a protective member 80 (see FIG. 9). Thereafter, the adhesive layer 30 is placed on the protective member 80 and on the stretchable base material 10 and/or the covering layer 60. Through the above steps, a stretchable device according to a modification of the second embodiment can be manufactured.

[Second embodiment]
FIG. 7 is an enlarged top view of the area where the electronic component 70 of the stretchable device is mounted. FIG. 8 is a cross-sectional view schematically showing a stretchable device according to the second embodiment. A second embodiment will be described with reference to FIGS. 7 and 8. The stretchable device differs from the stretchable device according to the first embodiment in that it includes an electronic component 70.

As shown in FIG. 7, the stretchable wiring 20 may be connected to an electronic component 70. Although not shown, the electronic component 70 may be connected to the stretchable wiring 20 using solder, conductive adhesive, or the like. Alternatively, the electronic component 70 may be connected directly to the stretchable wiring 20. The electronic component 70 may be placed on the stretchable base material 10 and electrically connected to the stretchable wiring 20.

The electronic component 70 can be various electronic components used depending on the purpose of the stretchable device. By way of example only, the electronic component 70 may be an LED, a field effect transistor (FET), an operational amplifier, a capacitor, a resistor, a thermistor, a strain gauge, a color sensor, or the like. In one embodiment, the electronic component 70 is configured to be able to detect signals related to the adherend 200 and may be placed on the second main surface 12 side of the stretchable base material. Examples of the acquired signals include signals related to the temperature, color, vibration, etc. of the adherend 200. For example, when the adherend 200 is a living body, the electronic component 70 may be configured to control the target living body's body temperature, pulse rate, oxygen saturation in the blood, blood pressure, electrocardiogram signal, electrical conductivity of the body surface, skin movement ( For example, it may be possible to acquire signals related to skin expansion/contraction, changes in distortion, etc.). The electronic component 70 may be configured to include a sensor depending on the type of signal to be acquired. Furthermore, the electronic component 70 may include multiple types of sensors so that multiple types of signals can be acquired. Alternatively, the stretchable device may include multiple electronic components including one or more sensors of the same or different types.

As shown in FIG. 8, the electronic component 70 may overlap the adhesive layer 30 when viewed from the thickness direction X of the stretchable base material. That is, in cross-sectional view, the adhesive layer 30 may be positioned between the electronic component 70 and the adherend 200. The adhesive layer 30 that overlaps the electronic component 70 in plan view may be able to be attached to the adherend 200. In other words, the electronic component 70 may be attached to the adherend 200 using the adhesive layer 30. That is, when the stretchable device is attached, the electronic component 70 is attached to the adherend 200 by the adhesive layer 30, and the electronic component 70 and the adherend 200 are held in a state in which they are attached to each other via the adhesive layer 30. be done.

According to such a configuration, the electronic component 70 can be held in closer contact with the surface to be measured. Therefore, information about the adherend 200 can be acquired with higher sensitivity. Furthermore, since the position of the electronic component 70 is suitably fixed on the adherend 200 by the adhesive layer 30, the positional shift of the electronic component 70 is suppressed during detection, and errors during detection can be reduced. Therefore, the above-described configuration can provide a suitable stretchable device that can both suppress changes in the resistance value of the stretchable wiring 20 due to deformation of the stretchable device and improve detection accuracy.

[Modification of second embodiment]
9 and 10 are cross-sectional views schematically showing a stretchable device according to a modification of the second embodiment. A modification of the second embodiment will be described with reference to FIGS. 9 and 10. The stretchable device differs from the stretchable device according to the second embodiment in that it includes a protection member 80 for the electronic component 70.

As illustrated, the electronic component 70 may be covered with a protective member 80. For example, the protective member 80 may cover the outer surface of the electronic component 70 other than the surface facing the stretchable base material 10. In this structure, the protection member 80 functions as a sealing member that protects the electronic component 70. Although not shown, the protection member 80 may be in contact with the stretchable wiring 20 connected to the electronic component 70. Furthermore, the protective member 80 may be in contact with the elastic base material 10. As shown in FIG. 10, the protective member 80 may also be placed between the stretchable base material 10 and the electronic component 70. Thereby, infiltration of moisture into the electronic component 70 from the outside can be suppressed more suitably.

In cross-sectional view, the adhesive layer 30 may be provided between the protection member 80 and the adherend 200. When viewed from the thickness direction X of the stretchable base material, the electronic component 70, the protective member 80, and the adhesive layer 30 may overlap each other. That is, the electronic component 70 can be attached to the adherend 200 with the adhesive layer 30 via the protective member 80.

According to this configuration, since the electronic component 70 is protected by the protective member 80, it is possible to suppress damage to the electronic component 70 due to stress generated when the stretchable device is peeled off for reattachment. Furthermore, since the protective member 80 is configured to be in contact with the stretchable wiring 20, the connection portion between the electronic component 70 and the stretchable wiring 20 is covered with the protective member 80. Therefore, the above-described structure including the protection member 80 can also contribute to improving the connection reliability between the electronic component 70 and the stretchable wiring 20.

The protective member 80 may be formed from a resin material. For example, the protective member 80 is made of polyvinyl chloride, polyethylene, polystyrene, polycarbonate, polyvinylidene fluoride, polyimide, liquid crystal polymer, polytetrafluoroethylene, phenol resin, epoxy resin, urethane resin, acrylic resin, silicone resin, It may be made of elastomer resin such as styrene-butadiene resin. Note that the protection member 80 may be composed of a plurality of members.

Although the embodiments of the present disclosure have been described above, these are merely typical examples. Those skilled in the art will readily understand that the present disclosure is not limited thereto, and that various embodiments can be considered without changing the gist of the present disclosure.

Note that one embodiment of the present disclosure as described above includes the following preferred aspects.
First aspect:
comprising a stretchable base material, stretchable wiring provided on the stretchable base material, and an adhesive layer having portions facing each other and separated from each other,
A stretchable device, wherein the stretchable wiring is located between mutually spaced and opposing portions of the adhesive layer when viewed from the thickness direction of the stretchable base material.
Second aspect:
The stretchable device according to the first aspect, wherein at least the main surface of the stretchable wiring facing the stretchable base material and the adhesive layer do not overlap with each other when viewed from the thickness direction of the stretchable base material.
Third aspect:
The stretchable device according to the first aspect or the second aspect, wherein the stretchable wiring is surrounded by one continuous adhesive layer when viewed from the thickness direction of the stretchable base material.
Fourth aspect:
In any of the first to third aspects, when viewed from the thickness direction of the stretchable base material, a first overlapping region where the stretchable base material and the adhesive layer overlap each other; A stretchable device, the stretchable device comprising a second overlapping region in which the material and the stretchable wiring overlap each other and do not overlap with the adhesive layer.
Fifth aspect:
The stretchable device according to any one of the first aspect to the fourth aspect, wherein the adhesive layer and the stretchable wiring are arranged at a distance from each other when viewed from the thickness direction of the stretchable base material.
Sixth aspect:
The stretchable device according to any one of the first aspect to the fifth aspect, wherein the stretchable wiring and the adhesive layer are located on the same main surface side of the stretchable base material.
Seventh aspect:
The stretchable device according to any one of the first to sixth embodiments, wherein the adhesive layer has a thickness greater than the stretchable wiring.
Eighth aspect:
In the seventh aspect, the stretchable device has a gap between the stretchable wiring and the adherend in cross-sectional view.
Ninth aspect:
In any of the first aspect to the fourth aspect and the sixth aspect to the eighth aspect, at least one of the adhesive layer and the end edge of the stretchable wiring, when viewed from the thickness direction of the stretchable base material. A stretchable device that partially overlaps each other.
Tenth aspect:
The stretchable device according to claim 9, wherein in the ninth aspect, the adhesive layer and the edge portion are in contact with each other.
Eleventh aspect:
The stretchable device according to any one of the first aspect to the tenth aspect, wherein the stretchable wiring is covered with a covering layer.
Twelfth aspect:
In the eleventh aspect, the coating layer is provided over the main surface of the stretchable base material on which the stretchable wiring is located,
A stretchable device, wherein the coating layer has a portion that overlaps with the adhesive layer when viewed from the thickness direction of the stretchable base material.
Thirteenth aspect:
In any of the first to twelfth aspects, further comprising an electronic component provided on the stretchable base material,
A stretchable device, wherein the electronic component overlaps the adhesive layer when viewed from the thickness direction of the stretchable base material.
Fourteenth aspect:
The stretchable device according to the thirteenth aspect, wherein the adhesive layer that overlaps with the electronic component can be attached to the adherend.
Fifteenth aspect:
The stretchable device according to the thirteenth or fourteenth aspect, wherein the electronic component is covered with a protective member.
Sixteenth aspect:
The stretchable device according to the fifteenth aspect, wherein the protective member is located between the electronic component and the adhesive layer when viewed in cross section.
Seventeenth aspect:
The stretchable device according to any of the first to sixteenth aspects, wherein the adhesive layer has a width of 1 mm or more and 20 mm or less.

100, 101-105: Stretchable device

10: Stretchable base material 11: First main surface 12: Second main surface 15: Area surrounded by adhesive layer

20: Stretchable wiring 21: Outer main surface of stretchable wiring 23: Side surface of stretchable wiring 25: Edge of stretchable wiring

30: Adhesive layer 31: Base material side main surface of the adhesive layer 32: Mounting side main surface of the adhesive layer

40: void

51: First overlapping area 52: Second overlapping area

60: Covering layer

70: Electronic parts

80: Protective member

200: Adherent

X: Thickness direction of stretchable base material

Claims

comprising a stretchable base material, stretchable wiring provided on the stretchable base material, and an adhesive layer having portions facing each other and separated from each other,
A stretchable device, wherein the stretchable wiring is located between mutually spaced and opposing portions of the adhesive layer when viewed from the thickness direction of the stretchable base material.
The stretchable device according to claim 1, wherein at least the outer main surface of the stretchable wiring facing the stretchable base material and the adhesive layer do not overlap with each other when viewed from the thickness direction of the stretchable base material. .
The stretchable device according to claim 1 or 2, wherein the stretchable wiring is surrounded by one continuous adhesive layer when viewed from the thickness direction of the stretchable base material.
When viewed from the thickness direction of the stretchable base material, a first overlapping region where the stretchable base material and the adhesive layer overlap each other, a first overlap region where the stretchable base material and the stretchable wiring overlap each other, and a first overlap region where the stretchable base material and the stretchable wiring overlap each other, and a first overlap region where the stretchable base material and the adhesive layer overlap each other; 4. A stretchable device according to any one of claims 1 to 3, comprising a second overlapping region that does not overlap the layer.
The stretchable device according to any one of claims 1 to 4, wherein the adhesive layer is placed apart from the stretchable wiring when viewed from the thickness direction of the stretchable base material.
The stretchable device according to any one of claims 1 to 4, wherein the adhesive layer and at least a portion of the end edge of the stretchable wiring overlap each other when viewed from the thickness direction of the stretchable base material.
The stretchable device according to claim 6, wherein the adhesive layer and the edge portion are in contact with each other.
The stretchable device according to any one of claims 1 to 7, wherein the stretchable wiring and the adhesive layer are located on the same main surface side of the stretchable base material.
The stretchable device according to any one of claims 1 to 8, wherein the thickness of the adhesive layer is greater than the thickness of the stretchable wiring.
The stretchable device according to claim 9, having a gap between the stretchable wiring and the adherend in a cross-sectional view.
The stretchable device according to any one of claims 1 to 10, wherein the stretchable wiring is covered with a covering layer.
The covering layer is provided over the main surface of the stretchable base material on which the stretchable wiring is located,
The stretchable device according to claim 11, wherein the covering layer has a portion that overlaps with the adhesive layer when viewed from the thickness direction of the stretchable base material.
Further comprising an electronic component provided on the stretchable base material,
The stretchable device according to claim 1, wherein the electronic component and the adhesive layer overlap each other when viewed from the thickness direction of the stretchable base material.
The stretchable device according to claim 13, wherein the adhesive layer overlapping the electronic component can be attached to an adherend.
The stretchable device according to claim 13 or 14, wherein the electronic component is covered with a protective member.
The stretchable device according to claim 15, wherein the protective member is located between the electronic component and the adhesive layer in cross-sectional view.
The stretchable device according to any one of claims 1 to 16, wherein the adhesive layer has a width of 1 mm or more and 20 mm or less.