JP2024006442A - stretchable device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stretchable device in which deterioration in IR (insulation resistance) between wirings can be suppressed.

SOLUTION: In an embodiment of the present invention, a stretchable device is provided, including: stretchable base material 10; first stretchable wiring 20 and second stretchable wiring 40 provided on the stretchable base material and partially overlapped on each other in a thickness direction of the stretchable base material; an insulation layer 30 arranged on a wiring overlapping portion between the first stretchable wiring and the second stretchable wiring; and a first pressure-sensitive-adhesive layer 50 overlapped on at least a part of the insulation layer in the thickness direction. The first pressure-sensitive-adhesive layer has expansion/contraction performance relatively smaller than that in the insulation layer.

SELECTED DRAWING: Figure 4

COPYRIGHT: (C)2024,JPO&INPIT

Description

FIELD OF THE INVENTION The present invention relates to stretchable devices.

2. Description of the Related Art 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.

The stretchable device includes a stretchable base material, a first stretchable wiring provided on the stretchable base material, a second stretchable wiring arranged on the first stretchable wiring, a first stretchable wiring and a first stretchable wiring. It includes an insulating layer disposed in the wiring overlapping portion between two stretchable wirings, and a mounting adhesive layer (see Patent Document 1).

JP 2021-64676 Publication

However, depending on the properties of the adhesive layer or the adhesive layer, there is a possibility that the thickness of the insulating layer located at the wiring overlap portion between two stretchable wirings becomes thinner during expansion and contraction. Such a reduction in the thickness of the insulating layer results in a reduction in IR (insulation resistance) between the two wirings. As a result, there is a risk that device functions such as sensing and signal communication may deteriorate, and short circuits may occur due to ion migration and wiring contact.

Therefore, an object of the present invention is to provide a stretchable device that can suppress a decrease in IR (insulation resistance) between wirings.

In order to achieve the above object, in one embodiment of the present invention,
a stretchable base material, a first stretchable wiring and a second stretchable wiring provided on the stretchable base material and partially overlapping each other in the thickness direction of the stretchable base material, and the first stretchable wire; an insulating layer disposed in a wiring overlapping portion with the second stretchable wiring; and a first adhesive layer overlapping at least a portion of the insulating layer in the thickness direction, the first adhesive layer A stretchable device is provided that has relatively less stretchability than the layer.

According to the stretchable device according to an embodiment of the present invention, it is possible to suppress a decrease in IR (insulation resistance) between wirings.

FIG. 1 is a plan view schematically showing a stretchable device according to a first embodiment of the present invention. FIG. 2 is a partially enlarged schematic plan view of the stretchable device according to the first embodiment of the present invention. FIG. 3 is a partially enlarged schematic sectional view taken along line XX in FIG. 2 before the stretchable device according to the first embodiment of the present invention is stretched or contracted. FIG. 4 is a partially enlarged schematic sectional view taken along line segment XX in FIG. 2 when the stretchable device according to the first embodiment of the present invention is expanded and contracted. FIG. 5 is a partially enlarged schematic cross-sectional view of Modification Example 1 of the stretchable device according to the first embodiment of the present invention (corresponding to the cross-sectional view taken along line segment XX in FIG. 2). FIG. 6 is a partially enlarged schematic sectional view of Modification 2 of the stretchable device according to the first embodiment of the present invention (corresponding to the sectional view taken along line segment XX in FIG. 2). FIG. 7 is a partially enlarged schematic cross-sectional view of a stretchable device according to a second embodiment of the present invention (corresponding to the cross-sectional view taken between line segment XX in FIG. 2). FIG. 8 is a partially enlarged schematic sectional view of Modification Example 1 of the stretchable device according to the second embodiment of the present invention (corresponding to the sectional view taken along line segment XX in FIG. 2). FIG. 9 is a partially enlarged schematic sectional view of Modification Example 2 of the stretchable device according to the second embodiment of the present invention (corresponding to the sectional view taken along line segment XX in FIG. 2). FIG. 10 is a plan view schematically showing a stretchable device according to a third embodiment of the present invention. FIG. 11 is a partially enlarged schematic cross-sectional view of the stretchable device according to the third embodiment of the present invention taken along line segment YY in FIG. FIG. 12 is a plan view schematically showing a stretchable device according to a fourth embodiment of the present invention. FIG. 13 is a partially enlarged schematic cross-sectional view of the stretchable device according to the fourth embodiment of the present invention, taken along line ZZ in FIG. FIG. 14 is a plan view schematically showing a stretchable device according to a fifth embodiment of the present invention. FIG. 15 is a partially enlarged schematic cross-sectional view of the stretchable device according to the fifth embodiment of the present invention taken along line segment WW in FIG. FIG. 16 is a partially enlarged schematic cross-sectional view of a conventional stretchable device before stretching and contraction. FIG. 17 is a partially enlarged schematic cross-sectional view of a conventional stretchable device when it is stretched or contracted.

Hereinafter, embodiments of the present invention 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. Furthermore, 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.

[First embodiment]
The configuration of the stretchable device 100 according to the first embodiment will be described below with reference to FIGS. 1 to 4.

FIG. 1 is a plan view schematically showing a stretchable device according to a first embodiment of the present invention. FIG. 2 is a partially enlarged schematic plan view of the stretchable device according to the first embodiment of the present invention. FIG. 3 is a partially enlarged schematic sectional view taken along line XX in FIG. 2 before the stretchable device according to the first embodiment of the present invention is stretched or contracted. FIG. 4 is a partially enlarged schematic sectional view taken along line segment XX in FIG. 2 when the stretchable device according to the first embodiment of the present invention is expanded and contracted. In addition, in the cross-sectional views in this specification, the thickness direction of the stretchable base material described later is indicated by a double-headed arrow X. 3 and 4 are cross-sectional views taken along the line segment XX in FIG. 2, that is, in the extending direction of the first stretchable wiring.

The stretchable device 100 according to the first embodiment of the present invention includes a stretchable base material 10, a first stretchable wiring 20, a second stretchable wiring 40, an insulating layer 30, and a first adhesive layer 50 (Figs. (See Figure 4).

Hereinafter, the components of the stretchable device 100 described above will be specifically explained. After that, the characteristic parts of the first embodiment will be explained.

(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. Examples of the resin material of the stretchable base material 10 include thermoplastic polyurethane (TPU), polyethylene (PE), polystyrene (PS), and polyethylene terephthalate (PET).

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 a living body when it is attached to a living body, it is preferably 100 μm or less, and more preferably 50 μm or less. Further, the thickness of the stretchable base material 1 is preferably 20 μm or more from the viewpoint of ensuring a predetermined strength.

(First elastic wiring 20/second elastic wiring 40)
The first stretchable wiring 20 and the second stretchable wiring 40 are provided on the stretchable base material 10, specifically, on the main surface thereof, and are mutually partially disposed in the thickness direction X of the stretchable base material 10. overlap.

Note that "above" in this specification refers to a state in which a state is located above a certain element, that is, a state in which it is located above a certain element through another object, a state in which it is located above an element at a distance, and Contains the state located directly above a certain element.

Therefore, in this specification, "the first stretchable wiring 20 and the second stretchable wiring 40 disposed on the stretchable base material 10" refer to the first and second stretchable wires in contact with the main surface of the stretchable base material 10. The second stretchable wiring 20, 40 and the first and second stretchable wires are not in direct contact with the main surface of the stretchable base material 10, but are separated from the main surface via another member (for example, a resin layer to be described later). and gender wirings 20 and 40.

In one example, as shown in FIG. 1, the first stretchable wiring 20 and the second stretchable wiring 40 form a wiring intersection portion where they intersect with each other. For example, the first stretchable wiring 20 and the second stretchable wiring 40 form a wiring intersection that intersects each other perpendicularly. The first stretchable wiring 20 and the second stretchable wiring 40 are each electrically connected to the electronic component 200.

The first stretchable wiring 20 and the second stretchable wiring 40 each contain conductive particles and resin. Examples of each stretchable wiring include a mixture of metal powder such as Ag, Cu, and Ni as conductive particles and an elastomer resin such as silicone resin. Although the average particle size of the conductive particles is not particularly limited, it 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 each stretchable wiring 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 each stretchable wiring is 0.01 μm or more. Although the line width of each stretchable wiring is not particularly limited, it is preferably 0.1 μm or more, and more preferably 10 mm or less. Further, the shape and number of each stretchable wiring are not particularly limited.

In addition, from the viewpoint of more reliably preventing short circuits during use of the stretchable device 100, it is preferable that the stretching direction of the first stretchable wiring 20 is the longitudinal direction of the stretchable device 100 (i.e., the stretching direction). .

(Insulating layer 30)
The insulating layer 30 is a layer disposed to prevent short circuits due to contact between stretchable wirings. Specifically, the insulating layer 30 is arranged in the wiring overlapping portion 70 between the first stretchable wiring 20 and the second stretchable wiring 40. From the viewpoint of suitably avoiding contact between the wires, the width of the insulating layer 30 is preferably greater than or equal to the width of the second stretchable wire 40 and larger than the width of the second stretchable wire 40 in cross-sectional view.

The insulating layer 30 may be made of, for example, at least one resin material selected from the group consisting of polyimide resin, epoxy resin, urethane resin, and acrylic resin. Further, the insulating layer 30 may be formed of an inorganic material such as alumina or silicon dioxide.

(First adhesive layer 50)
The first adhesive layer 50 is arranged so as to overlap at least a portion of the insulating layer 30 in the thickness direction X of the stretchable base material 10. That is, in the thickness direction X of the stretchable base material, the first adhesive layer 50 is arranged so as to overlap with the wire overlapping portion 70 (for example, the wire intersection portion) of both the stretchable wires 20 and 40.

The first adhesive layer 50 has adhesiveness that allows the stretchable device 100 to be attached to an adherend 300 such as a living body. In one example, the first adhesive layer 50 may be positioned between the stretchable base material 10 and an adherend 300 such as a living body.

The first adhesive layer 50 includes a first main surface 51 on the side of the adherend 300, such as a living body, and a second main surface 52 on the opposite side. It is preferable that the first adhesive layer 50 has adhesive properties on both main surfaces. The first main surface 51 of the first adhesive layer 50 can be attached to a living body or the like. Note that it is also possible that the first main surface 51 of the first adhesive layer 50 itself is attached to another layer, and then the other layer is attached to a living body or the like.

The second main surface 52 of the first adhesive layer 50 can be attached to the elastic base material 10. Note that a protective layer, which will be described later, may be further disposed between the second main surface 52 of the first adhesive layer 50 and the stretchable base material 10 from the viewpoint of improving waterproofness.

As the first adhesive layer 50, any adhesive may be used without particular restrictions as long as it is non-irritating to the skin, has sufficient pressure-sensitive adhesiveness, and can be easily peeled off from the skin after use. I can do it.

Although not particularly limited, the first adhesive layer 50 may be composed of a pressure-sensitive adhesive or the like. The pressure-sensitive adhesive is not particularly limited as long as it can be laminated on the elastic base material 10 and generally used. For example, as the pressure-sensitive adhesive, rubber-based, acrylic-based, or silicone-based adhesives can be used. When using a pressure-sensitive adhesive, it can be bonded to the other member (stretch base material, protective layer described below) at a relatively low temperature, so using excessive heat or UV energy may cause deterioration of the stretch base material 10, Distortion can be prevented.

Note that although FIGS. 1 to 4 show an embodiment in which the insulating layer 30 and the first adhesive layer 50 have substantially the same width, the width of the first adhesive layer 50 is not limited to this. The dimension may be larger than the width dimension of the insulating layer 30. In this case, due to the difference in width between the two, stress generated in the stretchable device 100 may be more relaxed than when the widths of the two are substantially the same.

(Characteristics of the first embodiment)
Based on the contents of the main components of the stretchable device 100 described above, the features of the first embodiment will be described below. The first embodiment is based on the premise that the first adhesive layer 50 overlaps at least a portion of the insulating layer 30 in the thickness direction It is characterized by having low elasticity (or elasticity or elasticity).

In the present specification, "stretch performance (or stretchability or stretch rate)" refers to the adhesive layer (first adhesive layer/second adhesive layer described later) and insulating layer, which are the components of a stretchable device. In a narrow sense, it refers to the property and ability of expansion and contraction of the adhesive layer and the insulating layer, which can be evaluated based on the difference in Young's modulus and/or the difference in thickness between the adhesive layer and the insulating layer.

Furthermore, the term "stretchability is low" as used herein refers to a state in which it is difficult to stretch and contract, and refers to a state in which the Young's modulus is large and/or a state in which the thickness is large. That is, the larger the Young's modulus is, the more difficult it is to expand and contract, and the larger the thickness is, the more difficult it is to expand and contract, and this state is defined as having low elastic performance. On the other hand, in this specification, a state where the material is easy to expand and contract, that is, a state where the Young's modulus is small and/or a state where the thickness is small, can be defined as having high elastic performance.

As an example, the Young's modulus of the first adhesive layer 50 is greater than the Young's modulus of the insulating layer 30. In the first embodiment, the width of the first adhesive layer 50 and the width of the insulating layer 30 are the same or substantially the same. Further, the thickness direction dimension of the stretchable base material 10 of the first adhesive layer 50 and the thickness direction dimension of the stretchable base material 10 of the insulating layer 30 are also mutually the same or substantially the same. That is, the cross-sectional area of the first adhesive layer 50 and the cross-sectional area of the insulating layer 30 may be the same or substantially the same.

According to the above feature, since the first adhesive layer 50 has a relatively smaller elasticity than the insulating layer 30, the first adhesive layer 50 may have properties that are relatively harder than the insulating layer 30. Therefore, when the stretchable device 100 expands or contracts, the first adhesive layer 50 located in the wiring overlapping portion 70 of both stretchable wirings 20 and 40 is difficult to expand or contract. Accordingly, the local portions of both stretchable wirings 20 and 40 located in the portions overlapping with the first adhesive layer 50, which is difficult to expand and contract, also become difficult to expand and contract.

As a result, the insulating layer 30 located in the wiring overlap portion 70 between the first stretchable wiring 20 and the second stretchable wiring 40 also becomes difficult to expand and contract. As a result, compared to the previous embodiment (see FIGS. 16 and 17) in which the thickness of the insulating layer 30' may be thinner when the stretchable device 100' is stretched than before the stretchable device 100' is stretched, A reduction in the thickness of the insulating layer 30 can be suppressed (see FIGS. 3 and 4).

As a result, by suppressing the reduction in the thickness of the insulating layer 30, it is possible to suppress a decrease in IR (insulation resistance) between the two stretchable wirings 20 and 40. That is, the occurrence of leakage voltage (or leakage current) between the two stretchable wirings 20 and 40 can be suppressed.

As a result, when the device expands and contracts, the voltage of one of the two stretchable wirings 20, 40 decreases (for example, from 5V to 4V), and the voltage of the other of the two stretchable wirings 20, 40 increases accordingly (for example, from 0V to 1V). ) can be suitably suppressed. This makes it possible to stabilize the voltages of the two stretchable wirings 20 and 40 when the device expands and contracts, and it becomes possible to stabilize the voltage supply to the functional components.

Therefore, according to the first embodiment, it is possible to maintain device functions such as sensing and signal communication. Furthermore, when driving a device at high humidity and high temperature, ion migration and wiring contact occur at the wiring overlap portion 70 (for example, a wiring intersection portion) of both stretchable wirings, where the voltage difference between both stretchable wirings becomes large during expansion and contraction. This makes it possible to avoid short circuits.

Further, from the viewpoint of suppressing the occurrence of ion migration, it is preferable that the first stretchable wiring 20 and the second stretchable wiring 40 have different potentials. Furthermore, according to the first embodiment, the insulating layer 30 is only located in the overlapping portion 70 between the first stretchable wiring 20 and the second stretchable wiring 40, so that it is not connected to the adherend 300 such as a living body. A gap can be provided between the stretchable base material 10 and the stretchable base material 10 . Thereby, the breathability of the stretchable device 100 can also be improved.

In the above, the aspects of the stretchable device before and during expansion and contraction have been explained using FIGS. It should be added for confirmation that the modified examples and the second to fifth embodiments will be explained.

Further, on the premise that the elasticity is relatively smaller than that of the insulating layer 30, two or more first adhesive layers 50 having different elasticity and contraction performance may be provided. In this case, compared to the insulating layer 30, a relatively harder (super hard) first adhesive layer and a relatively harder (harder) first adhesive layer may be provided. For example, it may be a structure in which two first adhesive layers are laminated, or a structure in which two first adhesive layers are arranged side by side in the width direction.

[Modification 1 of the first embodiment]
Hereinafter, the configuration of Modification Example 1 of the stretchable device according to the first embodiment will be described with reference to FIG. 5. Modification 1 of the first embodiment differs from the first embodiment (see FIGS. 3 and 4) in the form of the first adhesive layer 50A.

FIG. 5 is a partially enlarged schematic cross-sectional view of Modification Example 1 of the stretchable device according to the first embodiment of the present invention (corresponding to the cross-sectional view taken along line segment XX in FIG. 2).

As shown in FIG. 5, the thickness of the first adhesive layer 50A is greater than the thickness of the insulating layer 30. In this case, the Young's modulus of the first adhesive layer 50A is smaller than the Young's modulus of the insulating layer 30. That is, compared to the first adhesive layer 50 shown in FIGS. 3 and 4, a first adhesive layer 50A that is relatively soft and thick can be used. In addition to this, it is preferable that the width of the first adhesive layer 50A is larger than the width of the insulating layer 30.

By adopting such a configuration, the first adhesive layer 50A can provide relatively smaller elasticity than the insulating layer 30. As a result, the insulating layer 30 located in the overlapping portion between the first stretchable wiring 20 and the second stretchable wiring 40 also becomes difficult to expand and contract. As a result, the reduction in the thickness of the insulating layer 30 before and after stretching the stretchable device 100A is suppressed, thereby suppressing a decrease in IR (insulation resistance) between the two stretchable wirings 20 and 40.

It goes without saying that the Young's modulus of the first adhesive layer 50A may be larger than the Young's modulus of the insulating layer 30 if the first adhesive layer 50A has a relatively smaller elasticity than the insulating layer 30. .

[Modification 2 of the first embodiment]
Hereinafter, the configuration of the second modification of the stretchable device according to the first embodiment will be described with reference to FIG. 6. Modification 2 of the first embodiment differs from the first embodiment (see FIGS. 3 and 4) in the arrangement location of the first adhesive layer 50B.

FIG. 6 is a partially enlarged schematic sectional view of Modification 2 of the stretchable device according to the first embodiment of the present invention (corresponding to the sectional view taken along line segment XX in FIG. 2).

As shown in FIG. 6, in modification example 2, the stretchable device 100B may further include a protective layer 60.
The second stretchable wiring 40 has a first side 41 facing the insulating layer and a second side 42 opposite to the first side 41 . In this case, the protective layer 60 is preferably in contact with the second side 42 of the second elastic wiring 40 from the viewpoint of ensuring biocompatibility and insulation as well as waterproofing. Further, as shown in FIG. 6, in one example, the protective layer 60 may be placed in contact with the first stretchable wiring 20. However, without being limited thereto, a gap may be provided between the protective layer 60 and the first stretchable wiring 20 in a cross-sectional view.

In view of the above, the protective layer 60 may be formed from a stretchable resin material. For example, the protective layer 60 may be formed of polyester resin, styrene resin, olefin resin, epoxy resin, urethane resin, acrylic resin, or silicone resin.

Under such a configuration, the first adhesive layer 50B can be positioned between the protective layer 60 and the adherend 300 such as a living body. That is, the first adhesive layer 50B in Modification Example 2 is different from the first adhesive layer 50 shown in FIGS. It can be positioned in between. Note that, like the first adhesive layer 50 shown in FIGS. 3 and 4, the first adhesive layer 50B in Modification 2 is also premised on providing a relatively smaller elasticity than the insulating layer 30.

As a result of the above, also in Modification 2, the insulating layer 30 located in the overlapping portion between the first stretchable wiring 20 and the second stretchable wiring 40 also becomes difficult to expand and contract. As a result, the reduction in the thickness of the insulating layer 30 before and after stretching the stretchable device 100B is suppressed, thereby suppressing a decrease in IR (insulation resistance) between the two stretchable wirings 20 and 40.

In addition, in the first embodiment and its modifications 1 and 2, the thickness of the first adhesive layer 50 should be constant from the viewpoint of adhering suitably to both the elastic base material 10 and the adherend 300 such as a living body. is preferred. Furthermore, as described above, the first adhesive layer 50 has the characteristic of being relatively harder than the insulating layer 30 by adjusting the properties (Young's modulus) of the first adhesive layer 50 itself and the thickness of the first adhesive layer 50 itself. be able to. That is, the first adhesive layer 50 is technically different from the previous embodiment in that it can provide a feature of being relatively harder than the insulating layer 30 even if it does not have a separate reinforcing member inside. There is.

[Second embodiment]
Hereinafter, the configuration of the stretchable device according to the second embodiment will be described with reference to FIG. 7. Compared to the first embodiment (see FIGS. 3 and 4), the second embodiment differs in that at least two types of adhesive layers are used.

FIG. 7 is a partially enlarged schematic cross-sectional view of a stretchable device according to a second embodiment of the present invention (corresponding to the cross-sectional view taken between line segment XX in FIG. 2).

In the second embodiment, a second adhesive layer 52C is further used in addition to the first adhesive layer 51C. Specifically, as shown in FIG. 7, the second adhesive layer 52C faces at least one side of the first adhesive layer 51C in cross-sectional view, and has a Young's modulus different from that of the first adhesive layer 51C. obtain.

Furthermore, compared to the properties of the insulating layer 30, the second adhesive layer 52C may have a relatively smaller elasticity than the insulating layer 30. For example, the second adhesive layer 52C may have a relatively smaller Young's modulus than the insulating layer 30.

According to this configuration, compared to the first embodiment, the first adhesive layer 51C and the second adhesive layer 52C can be arranged adjacent to each other in parallel. Thereby, the proportion of the adhesive layer occupying the area between the stretchable base material 10 and the adherend 300 such as a living body can be increased. Further, when the stretchable device 100 is stretched, the thickness of the region between the stretchable base material 10 and the adherend 300 such as a living body can be made uniform as a whole.

As a result, compared to the case where only the first adhesive layer in the first embodiment is disposed, in cross-sectional view, at least one side of the first adhesive layer 51C has more elasticity toward the adherend 300 during expansion and contraction. Unintentional local bending or bending of the device 100C (specifically, the stretchable base material 10 and the stretchable wirings 20 and 40) can be suppressed. As a result, the overall strength of the stretchable device 100C can be improved.

In addition, from the viewpoint of further improving the uniformity of the thickness of the region between the elastic base material 10 and the adherend 300 such as a living body during expansion and contraction, as shown in FIG. 7, the second adhesive layer 52C is It is preferable to contact the first adhesive layer 51C. Without being limited to this, in another example, the first adhesive layer and the second adhesive layer 52 may be arranged so as to be separated from each other and face each other, as shown in a modification example described below.

[Modification 1 of the second embodiment]
Hereinafter, the configuration of Modification Example 1 of the stretchable device according to the second embodiment will be described with reference to FIG. 8. Modification 1 of the second embodiment differs from the second embodiment (see FIG. 7) in the width dimension of the first adhesive layer.

FIG. 8 is a partially enlarged schematic sectional view of Modification Example 1 of the stretchable device according to the second embodiment of the present invention (corresponding to the sectional view taken along line segment XX in FIG. 2).

In Modification 1 of the second embodiment, as shown in FIG. 8, the width of the first adhesive layer 51D is smaller than the width of the insulating layer 30 in cross-sectional view. In other words, the first adhesive layer 51D and the second adhesive layer 52D may overlap with the insulating layer 30 in the thickness direction X of the stretchable base material 10.

According to this configuration, since the width of the first adhesive layer 51D is smaller than the width of the insulating layer 30, stress concentration on the first adhesive layer 51D, which has relatively hard properties, is suppressed when the stretchable device 100D expands and contracts. can do.

That is, when the stretchable device 100D shown in FIG. The stress applied to the first adhesive layer 51D, which has a hard property, can be alleviated.

When the width of the first adhesive layer and the width of the insulating layer are the same or substantially the same, stress concentration points in the stretchable device are at the interface between the first adhesive layer and the component in contact with it in the width direction, and at the width It may be an interface between an insulating layer and a component in contact with the insulating layer in the direction.

On the other hand, in this embodiment, since the first adhesive layer 51D and the second adhesive layer 52D overlap with the insulating layer 30 in the thickness direction X of the elastic base material 10, the relatively soft insulating layer 30 In the thickness direction X of the stretchable base material 10, in the overlapping region between the first adhesive layer 51D and the insulating layer 30, the influence of the first adhesive layer 51D having a harder property is strong. In the overlapping region between the second adhesive layer 52D and the insulating layer 30, the influence of the second adhesive layer 52D, which has a harder property, is strong. In the thickness direction X of the stretchable base material 10, the influence of the second adhesive layer 52D acts in areas where the second adhesive layer 52D and the insulating layer 30 do not overlap.

From the above, if the Young's modulus of each of the second adhesive layer 52D, the insulating layer 30, and the first adhesive layer 51D is increased in this order, the ease of expansion and contraction can be gradually changed. The stress on the device can be further alleviated.

[Modification 2 of the second embodiment]
Hereinafter, the configuration of the second modification of the stretchable device according to the second embodiment will be described with reference to FIG. 9. Modification 2 of the second embodiment differs from the second embodiment and Modification 1 thereof (see FIGS. 7 and 8) in the arrangement of the first adhesive layer 51E and the second adhesive layer 52E. .

FIG. 9 is a partially enlarged schematic sectional view of Modification Example 2 of the stretchable device according to the second embodiment of the present invention (corresponding to the sectional view taken along line segment XX in FIG. 2).

Specifically, in cross-sectional view, the second adhesive layer 52E may be separated from the first adhesive layer 51E. According to this configuration, the thickness of the area between the stretchable base material 10 and the adherend 300 such as a living body when the stretchable device 100E is stretched or contracted due to the parallel arrangement of the first adhesive layer 51E and the second adhesive layer 52E. It is possible to improve uniformity. In addition, the separation between the second adhesive layer 52E and the first adhesive layer 51E may provide a gap (equivalent to a physical space), so that the adherend 300 such as a living body and the stretchable base material 10 can be separated from each other. It is also possible to improve the air permeability between the two.

[Third embodiment]
Hereinafter, the configuration of the stretchable device according to the third embodiment will be described with reference to FIGS. 10 and 11. The third embodiment differs from the first embodiment (see FIGS. 3 and 4) in that there are a plurality of wiring overlapping portions 70F.

FIG. 10 is a plan view schematically showing a stretchable device according to a third embodiment of the present invention. FIG. 11 is a partially enlarged schematic cross-sectional view of the stretchable device according to the third embodiment of the present invention taken along line segment YY in FIG.

As shown in FIG. 10, the third embodiment is based on the premise that there are a plurality of wiring overlapping portions 70F. In this specification, each of the plurality of stretchable wires that overlap the first stretchable wire 20 corresponds to the second stretchable wires 41 to 43 described above.

In this case, as shown in FIG. 11, the first adhesive layer 50F may overlap the insulating layer 30F in the plurality of wiring overlapping portions 70F in the thickness direction X of the stretchable base material. In one example, as shown in FIG. 11, an insulating layer 30F and a first adhesive layer 50F overlapping the insulating layer 30F may be positioned in each of the plurality of wiring overlapping portions 70F.

Similarly to the first embodiment, in the third embodiment, each first adhesive layer 50F overlaps with the insulating layer 30 in the thickness direction It has small expansion and contraction performance. According to such a configuration, the insulating layer 30 located in each wiring overlapping portion 70F also becomes difficult to expand and contract, so that each insulating layer before and after expansion and contraction of the stretchable device 100F is more difficult to expand and contract than in the previous embodiment (see FIGS. 16 and 17). The reduction in the thickness of 30F can be suppressed (see FIGS. 10 and 11).

From the above, even when there are multiple wiring overlapping parts 70F, by suppressing the reduction in the thickness of each insulating layer 30F, the IR (insulation resistance) between the stretchable wirings 20 and 40 in each wiring overlapping part 70F can be reduced. Can be suppressed. That is, it is possible to suppress the occurrence of leakage current between the stretchable wirings 20 and 40 in each wiring overlapping portion 70F.

Further, in the third embodiment, since the plurality of first adhesive layers 50F may be arranged at predetermined intervals, a predetermined interval may be provided between the adherend 300 such as a living body and the elastic base material 10. A plurality of gaps may be formed. Thereby, it is possible to improve the air permeability between the adherend 300 such as a living body and the stretchable base material 10.

[Fourth embodiment]
Hereinafter, the configuration of the stretchable device according to the fourth embodiment will be described with reference to FIGS. 12 and 13. The fourth embodiment differs from the third embodiment (see FIGS. 10 and 11) in that one insulating layer and one first adhesive layer are positioned so as to straddle a plurality of wiring overlapping parts.

FIG. 12 is a plan view schematically showing a stretchable device according to a fourth embodiment of the present invention. FIG. 13 is a partially enlarged schematic cross-sectional view of the stretchable device according to the fourth embodiment of the present invention, taken along line ZZ in FIG.

As shown in FIGS. 12 and 13, in the fourth embodiment, one insulating layer 30G spanning multiple wiring overlapping portions 70G and a first adhesive layer 50G overlapping one insulating layer 30G can be positioned.

According to this configuration, compared to the third embodiment, when manufacturing a stretchable device 100G including a plurality of wiring overlapping portions 70G, the material of the first adhesive layer is continuously applied to the main surface of the stretchable base material 10 at one time. can be provided. Furthermore, the material for the insulating layer can be continuously applied to the main surface of the first stretchable wiring 20 at once.

As described above, the manufacturing process of the stretchable device 100G including the plurality of wiring overlapping portions 70G can be simplified, so that the manufacturing efficiency of the stretchable device 100G according to the fourth embodiment can be improved.

Further, in the fourth embodiment, since one insulating layer 30G is arranged to straddle the plurality of wiring overlapping parts 70G, contact between the first stretchable wiring 20 and each of the second stretchable wirings 41 to 43 is prevented. This can be suppressed more suitably. Thereby, it is possible to more appropriately suppress the occurrence of ion migration and the occurrence of short circuits.

Furthermore, in the fourth embodiment, since one first adhesive layer 50G is positioned so as to straddle the plurality of wiring overlapping parts 70G, the first adhesive layer 50G that occupies between the adherend 300 such as a living body and the elastic base material 10 The area of the adhesive layer 50G may be wide. This increases the connection strength with the elastic base material 10,
The strength of the stretchable device 100G can be improved. Furthermore, since the adhesive area to the adherend 300 such as a living body becomes wider, it becomes easier to hold the stretchable device 100G to the adherend 300 such as a living body.

[Fifth embodiment]
Hereinafter, the configuration of the stretchable device according to the fifth embodiment will be described with reference to FIGS. 14 and 15. The fifth embodiment differs from the first embodiment (see FIGS. 1 to 4) in that electronic components are mounted on a stretchable device.

FIG. 14 is a plan view schematically showing a stretchable device according to a fifth embodiment of the present invention. FIG. 15 is a partially enlarged schematic cross-sectional view of the stretchable device according to the fifth embodiment of the present invention taken along line segment WW in FIG.

As shown in FIGS. 14 and 15, in the fifth embodiment, the electronic component 200 is mounted and overlaps the first adhesive layer 50H in the thickness direction X of the stretchable base material 10. Electronic component 200 is connected to first stretchable wiring 20 via land 210.

By adopting such a configuration, in the fifth embodiment, the first adhesive layer 50H overlaps not only the insulating layer 30 but also the electronic component 200 in the thickness direction It has a relatively small expansion and contraction performance. Therefore, both the insulating layer 30F and the land 210, which overlap the first adhesive layer 50H, become difficult to expand and contract. This makes it possible to suppress a decrease in the IR between the stretchable wirings 20 and 40 in the wiring overlap portion 70 by suppressing a reduction in the thickness of the insulating layer 30F before and after stretching and contracting the stretchable device 100H. In addition, it is possible to suppress disconnection of the electronic component 200 connected to the stretchable device 100H via the land 210 before and after the stretchable device 100H expands and contracts (see FIGS. 14 and 15).

Note that when an electronic component is mounted on a stretchable device, from the viewpoint of preventing expansion and contraction of the land 210 when the device expands and contracts and protecting the electronic component 200 connected to the land 210, it is necessary to cover the electronic component 200 and the land 210. A step of adding resin material (potting step) may usually be necessary.

In this regard, as described above, in the fifth embodiment, the expansion and contraction of the land 210 before and after the expansion and contraction of the stretchable device 100H and the accompanying disconnection of the electronic component 200 can be suppressed. Therefore, the above-mentioned potting step is not necessary. Since such a step is not necessary, it is possible to prevent chemical attacks from occurring and to reduce the height of the electronic component 200.

In addition, each embodiment and a modification are illustrations, and this invention is not limited to each embodiment and a modification. Moreover, each drawing is an illustration of the constituent elements, and does not limit the shape. Moreover, partial substitution or combination of the configurations shown in the different embodiments and modifications is possible.

A stretchable device according to an embodiment of the present invention may take the following aspects.
<1>
a stretchable base material, a first stretchable wiring and a second stretchable wiring provided on the stretchable base material and partially overlapping each other in the thickness direction of the stretchable base material, and the first stretchable wire; an insulating layer disposed in a wiring overlapping portion with the second stretchable wiring; and a first adhesive layer overlapping at least a portion of the insulating layer in the thickness direction, the first adhesive layer A stretchable device that has relatively less stretchability than the layer.
<2>
The stretchable device according to <1>, wherein the first stretchable wire and the second stretchable wire intersect with each other in the wire overlapping portion.
<3>
The elastic device according to <1> or <2>, wherein the first adhesive layer has a Young's modulus larger than that of the insulating layer.
<4>
The stretchable device according to any one of <1> to <3>, wherein the first adhesive layer is located between the stretchable base material and the adherend.
<5>
Further comprising a protective layer, the second stretchable wiring has a first side facing the insulating layer and a second side opposite to the first side, and the protective layer has a first side facing the insulating layer and a second side opposite the first side. The stretchable device according to any one of <1> to <4>, wherein the first adhesive layer is located between the protective layer and the adherend.
<6>
<1>, further comprising the second adhesive layer, the second adhesive layer facing at least one side of the first adhesive layer in cross-sectional view, and having a Young's modulus different from that of the first adhesive layer. ~ The stretchable device according to any one of <5>.
<7>
The stretchable device according to <6>, wherein the second adhesive layer has relatively lower stretchability than the insulating layer.
<8>
The stretchable device according to <6> or <7>, wherein the second adhesive layer has a Young's modulus smaller than that of the insulating layer.
<9>
The stretchable device according to any one of <6> to <8>, wherein the second adhesive layer is separated from the first adhesive layer.
<10>
The stretchable device according to any one of <6> to <9>, wherein the second adhesive layer is in contact with the first adhesive layer.
<11>
The stretchable device according to any one of <6> to <10>, wherein the second adhesive layer overlaps the insulating layer in the thickness direction of the stretchable base material.
<12>
The stretchable device according to <11>, wherein the width of the first adhesive layer is smaller than the width of the insulating layer in cross-sectional view.
<13>
There are a plurality of wiring overlapping parts, and the insulating layer and the first adhesive layer overlapping the insulating layer are respectively positioned in each of the plurality of wiring overlapping parts in the thickness direction of the elastic base material. The stretchable device according to any one of <1> to <12>.
<14>
There are a plurality of wiring overlapping parts, and one of the insulating layers that straddles the plurality of wiring overlapping parts and the first adhesive layer that overlaps the one insulating layer are positioned in the thickness direction of the stretchable base material. , the stretchable device according to any one of <1> to <13>.
<15>
The stretchable device according to any one of <1> to <14>, wherein the first adhesive layer has a thickness greater than the insulating layer.
<16>
The stretchable device according to <15>, wherein when the thickness of the first adhesive layer is greater than the thickness of the insulating layer, the Young's modulus of the first adhesive layer is smaller than the Young's modulus of the insulating layer.
<17>
The stretchable device according to <16>, wherein the width of the first adhesive layer is larger than the width of the insulating layer in cross-sectional view.
<18>
The stretchable device according to any one of <1> to <17>, on which an electronic component can be mounted, and the electronic component overlaps the first adhesive layer in the thickness direction of the stretchable base material.
<19>
The stretchable device according to any one of <1> to <18>, wherein the first stretchable wiring and the second stretchable wiring have different potentials.
<20>
The stretchable device according to any one of <1> to <19>, wherein the first adhesive layer has a constant thickness.

300 Adherent 300 (living body, etc.)

200, 201, 202 Electronic parts

100, 100A~100H, 100' stretchable device

The stretchable device 100 according to the first embodiment of the present invention includes a stretchable base material 10, a first stretchable wiring 20, a second stretchable wiring 40, an insulating layer 30, and a first adhesive layer 50.


10,10' Stretchable base material

20, 20' 1st elastic wiring

30, 30F, 30G, 30' insulation layer

40, 40', 41-43 2nd elastic wiring

50, 50A, 50B, 51C, 51D, 51E, 50F, 50G, 50H, 50' First adhesive layer 52C, 52D, 52E Second adhesive layer

60 Protective layer

70, 70F, 70G wiring overlap area

X Thickness direction of stretchable base material

Claims (20)

a stretchable base material, a first stretchable wiring and a second stretchable wiring provided on the stretchable base material and partially overlapping each other in the thickness direction of the stretchable base material, and the first stretchable wire; an insulating layer disposed in a wiring overlapping portion with the second stretchable wiring; and a first adhesive layer overlapping at least a portion of the insulating layer in the thickness direction, the first adhesive layer A stretchable device that has relatively less stretchability than the layer. The stretchable device according to claim 1, wherein the first stretchable wire and the second stretchable wire intersect with each other in the wire overlapping portion. The stretchable device of claim 1, wherein the Young's modulus of the first adhesive layer is greater than the Young's modulus of the insulating layer. The stretchable device according to claim 1, wherein the first adhesive layer is located between the stretchable substrate and an adherend. Further comprising a protective layer, the second stretchable wiring has a first side facing the insulating layer and a second side opposite to the first side, and the protective layer has a second side opposite to the first side. 2. The stretchable device of claim 1, wherein the first adhesive layer is located between the protective layer and the adherend. Claim 1, further comprising the second adhesive layer, the second adhesive layer facing at least one side of the first adhesive layer in cross-sectional view, and having a Young's modulus different from that of the first adhesive layer. The stretchable device described in . The stretchable device according to claim 6, wherein the second adhesive layer has relatively lower stretchability than the insulating layer. 8. The stretchable device according to claim 7, wherein the Young's modulus of the second adhesive layer is smaller than the Young's modulus of the insulating layer. 7. The stretchable device of claim 6, wherein the second adhesive layer is spaced apart from the first adhesive layer. 7. The stretchable device of claim 6, wherein the second adhesive layer contacts the first adhesive layer. The stretchable device according to claim 6, wherein the second adhesive layer overlaps the insulating layer in the thickness direction of the stretchable base material. The stretchable device according to claim 11, wherein the width of the first adhesive layer is smaller than the width of the insulating layer in cross-sectional view. There are a plurality of wiring overlapping parts, and the insulating layer and the first adhesive layer overlapping the insulating layer are respectively positioned in each of the plurality of wiring overlapping parts in the thickness direction of the elastic base material. A stretchable device according to claim 1. There are a plurality of wiring overlapping parts, and one of the insulating layers that straddles the plurality of wiring overlapping parts and the first adhesive layer that overlaps the one insulating layer are positioned in the thickness direction of the stretchable base material. , the stretchable device of claim 1. The stretchable device according to claim 1, wherein the thickness of the first adhesive layer is greater than the thickness of the insulating layer. 16. The stretchable device according to claim 15, wherein when the thickness of the first adhesive layer is greater than the thickness of the insulating layer, the Young's modulus of the first adhesive layer is smaller than the Young's modulus of the insulating layer. The stretchable device according to claim 16, wherein the width of the first adhesive layer is larger than the width of the insulating layer in cross-sectional view. The stretchable device according to claim 1, wherein an electronic component can be mounted, and the electronic component overlaps the first adhesive layer in the thickness direction of the stretchable base material. The stretchable device according to claim 1, wherein the first stretchable wiring and the second stretchable wiring have different potentials. The stretchable device according to claim 1, wherein the first adhesive layer has a constant thickness.

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