Stretchable wiring board and current supply device

Abstract

[Problem] To provide a stretchable wiring board that can be reliably mechanically and electrically connected to a device main body with a simple configuration, and a current supply device provided with the stretchable wiring board. [Solution] According to one embodiment of the present invention, a stretchable wiring board is provided. This stretchable wiring board is provided with a stretchable sheet, a stretchable conductive layer, an external terminal, a first reinforcing part, and a second reinforcing part. The elastic sheet has an opening penetrating in the thickness direction thereof. The stretchable conductive layer is supported by a stretchable sheet. The external terminal is electrically connected to the stretchable conductive layer, and is inserted through the opening. At least a portion of the first reinforcing portion is disposed on one surface side of the stretchable conductive layer, at least a portion of the second reinforcing portion is disposed on the other surface side of the stretchable conductive layer, the external terminal is held between the first reinforcing portion and the second reinforcing portion, and at least a peripheral portion of the external terminal of the stretchable conductive layer is reinforced.

Description

Technical Field

[0001] The present invention relates to a stretchable wiring substrate and a current supply device. Background Art

[0002] Conventionally, for example, an electrical muscle stimulation (EMS) device is used as a device for supplying electric current to a living body (see Patent Document 1). The EMS device (1) described in Patent Document 1 includes an external device (3) and a stretchable wiring substrate (10), wherein the stretchable wiring substrate (10) includes riveted conductive hooks (21a, 21b). The conductive hooks (21a, 21b) are assembled by riveting a cap portion (210) and a protrusion portion (220) to clamp a non-stretchable substrate (12). Prior art literature Patent Literature

[0003] [Patent Document 1] Japanese Patent Publication No. 2021-34387 Summary of the invention Problems to be solved by the invention

[0004] However, since the cover (210) and the protrusion (220) of the conductive hooks (21a, 21b) are reinforced to clamp the highly rigid non-stretchable substrate, the protrusion (220) is exposed to the outside. In order to avoid this, it is necessary to use an insulating tape covering the end of the protrusion (220). As a result, the stretchable wiring substrate (10) (EMS device (1)) becomes thicker or its assembly operation becomes complicated. In view of the above circumstances, the present invention provides a stretchable wiring substrate capable of reliably mechanically and electrically connecting to a device main body with a simple structure, and a current supply device including the stretchable wiring substrate. Solutions to Solve Problems

[0005] According to one embodiment of the present invention, a stretchable wiring substrate is provided. The stretchable wiring substrate includes a stretchable sheet, a stretchable conductive layer, an external terminal, a first reinforcement portion, and a second reinforcement portion. The stretchable sheet has an opening portion extending through the stretchable conductive layer in the thickness direction thereof. The stretchable conductive layer is supported by the stretchable sheet. The external terminal is electrically connected to the stretchable conductive layer and inserted through the opening portion. At least a portion of the first reinforcement portion is disposed on the surface side of one side of the stretchable conductive layer, and at least a portion of the second reinforcement portion is disposed on the surface side of the other side of the stretchable conductive layer. The external terminal is held between the first reinforcement portion and the second reinforcement portion, and at least the peripheral portion of the external terminal of the stretchable conductive layer is reinforced.

[0006] According to such an aspect, reliable mechanical and electrical connection with the device main body can be achieved with a simple structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 The figures show the exploded state of the current supply device of the first embodiment ((a) is a top view of the stretchable wiring substrate, (b) is a top view of the device body, and (c) is a bottom view of the device body). Figure 2 yes Figure 1 AA line section view in. Figure 3 Yes means Figure 1 A cross-sectional view of a manufacturing process of a stretchable wiring substrate. Figure 4 It is a cross-sectional view showing a stretchable wiring substrate according to a second embodiment. Figure 5 1 and 2 are diagrams showing an exploded state of a current supply device according to a third embodiment ((a) is a top view of a stretchable wiring substrate, and (b) is a bottom view of a device body). Figure 6 yes Figure 5 BB line section view in. Figure 7 It is a cross-sectional view showing a stretchable wiring substrate according to a fourth embodiment. DETAILED DESCRIPTION

[0008] The following describes embodiments of the present invention using drawings. Various features shown in the following embodiments can be combined with each other.

[0009] In addition, the program for implementing the software appearing in this embodiment can be provided as a computer-readable non-transitory storage medium (Non-Transitory Computer-Readable Medium), can be provided in a downloadable manner from an external server, and can also be launched through an external computer to realize its functions on a client terminal (so-called cloud computing).

[0010] In addition, the "unit" in this embodiment may include, for example, a combination of hardware resources implemented by a generalized circuit and software information processing that can be specifically implemented by such hardware resources. In addition, although various information is processed in this embodiment, such information is a physical value representing a signal value of a voltage or current, or can be represented as a high or low signal value of a binary bit set (Bitset) composed of 0 or 1, or can be represented by quantum superposition (i.e., so-called quantum bit), and communication or operation can be performed on a generalized circuit.

[0011] In addition, a circuit in a broad sense is a circuit realized by at least appropriately combining circuits, circuit types, processors, and memories, etc. That is, it includes application-specific integrated circuits (ASICs), programmable logic devices (e.g., simple programmable logic devices (SPLDs), complex programmable logic devices (CPLDs), and field programmable gate arrays (FPGAs)).

[0012] <First Embodiment> First, a first embodiment of the current supply device of the present invention will be described. Figure 1 The figures show the exploded state of the current supply device of the first embodiment ((a) is a top view of the stretchable wiring substrate, (b) is a top view of the device body, and (c) is a bottom view of the device body). Figure 2 yes Figure 1 AA line section view in. Figure 3 Yes means Figure 1 A cross-sectional view of a manufacturing process of a stretchable wiring substrate. Note that in the following instructions, Figure 1 (a) and Figure 1 In (b), the front side of the paper is described as "front" or "upper", and the back side of the paper is described as "back" or "lower". Figure 1 In (c), the back side of the paper is described as "front" or "upper", and the front side of the paper is described as "back" or "lower". Figure 2 and Figure 3 In (b) to (d), the upper side is described as "surface" or "upper", and the lower side is described as "inner" or "lower". Figure 3 The lower side in (a) is described as "front" or "upper", and the upper side is described as "back" or "lower".

[0013] Figure 1 The current supply device 100 shown is a device for supplying current to a living body, and includes a stretchable wiring substrate 1 and a device main body 10 attached to the stretchable wiring substrate 1 . like Figure 2 As shown, the stretchable wiring substrate 1 includes a stretchable sheet 2, a stretchable conductive layer 3, a bioadhesive layer 4, a pair of hooks (external terminals) 5, a first reinforcement 6, and a second reinforcement 7. Figure 1In FIG. 1 , the stretchable conductive layer 3 and the first reinforcing portion 6 located on the back side (lower side) of the stretchable sheet 2 are shown through. The stretchable wiring substrate 1 is configured so that the stretchable conductive layer 3 is used as the skin surface side of the user. like Figure 1 As shown, the stretchable sheet 2 (stretchable wiring substrate 1) has a long strip shape. In this structure, it is also possible to have a plurality of appropriately shaped stretchable wiring substrates 1 according to the area of ​​the skin surface to be treated. In this case, if a predetermined stretchable wiring substrate 1 is selected and the device body 10 is installed for use, it is easier to reliably perform skin treatment that meets the user's requirements.

[0014] The stretchable sheet 2 has a function of supporting various parts including the stretchable conductive layer 3. The stretchable sheet 2 can stretch in any direction. There is no particular limitation on the material constituting the stretchable sheet 2, and examples thereof include elastomeric materials such as nitrile rubber, latex rubber, and polyurethane elastomers. In particular, by using a medical urethane elastomer sheet as the stretchable sheet 2, higher safety can be obtained even when the sheet is attached to the skin surface of a human body. The thickness of the stretchable sheet 2 is not particularly limited, but is preferably about 100 μm or less, more preferably about 25 μm or less, and further preferably about 10 μm or less from the perspective of not hindering the stretching and contraction of the biological skin surface to which the stretchable wiring substrate 1 is applied.

[0015] The maximum elongation of the stretchable sheet 2 is preferably about 10% or more, more preferably about 50% or more, further preferably about 100% or more, and particularly preferably about 200% or more. If the stretchable sheet 2 is made of the above materials, it can have a maximum elongation of about 300% or more, for example. Here, the maximum elongation of the stretchable sheet 2 refers to the maximum value of the elongation that can be elastically deformed in one direction in the in-plane direction. Note that in this specification, the so-called elongation refers to the ratio of the elongation in one direction in the in-plane direction by applying a force relative to the dimension when no external force is applied (elongation 0% dimension). For example, if the elongation is 50%, it is an elongation of 1.5 times the elongation of the elongation 0% dimension, and if the elongation is 100%, it is an elongation of 2 times the elongation of the elongation 0% dimension.

[0016] The stretchable sheet 2 has an opening 21 that penetrates in the thickness direction thereof. The hook 5 is inserted through the opening 21 and is exposed to the outside of the stretchable wiring board 1 . The stretchable conductive layer 3 is supported on the lower surface (other surface) side of the stretchable sheet 2. The stretchable conductive layer 3 may be disposed in direct contact with the stretchable sheet 2, or may be disposed via an intermediate layer of any purpose. like Figure 1 As shown, the stretchable conductive layer 3 is provided as a pair of left and right, and the two stretchable conductive layers 3 have substantially the same shape. However, the stretchable conductive layers 3 are not limited to two, and may be three or more. In this case, the shapes of the plurality of stretchable conductive layers 3 may be the same or different.

[0017] Such a stretchable conductive layer 3 can also stretch in any direction. The stretchable conductive layer 3 can be composed of, for example, a composite material (stretchable conductive material) containing a conductive filler and an elastomer. Examples of the conductive filler include carbon materials such as carbon nanotubes and carbon nanohorns, and metal materials such as gold, silver, copper, and nickel. Examples of the elastomer include thermoplastic elastomers such as polyamide-based thermoplastic elastomers, polyester-based thermoplastic elastomers, and polyurethane-based thermoplastic elastomers; and rubber materials such as ethylene propylene rubber, chloroprene rubber, natural rubber, and silicone rubber. With such a composite material, the stretchable conductive layer 3 can be produced relatively easily using a printing method.

[0018] The thickness and width of the stretchable conductive layer 3 are determined based on the resistance change of the stretchable conductive layer 3 when the stretchable sheet 2 is stretched, and also based on the constraints of the overall thickness and width of the stretchable wiring board 1 . From the viewpoint of ensuring good stretchability by following the dimensional change of the stretchable sheet 2 during extension, the width of the stretchable conductive layer 3 is preferably about 1000 μm or less, more preferably about 500 μm or less, and even more preferably about 200 μm or less. The thickness of the stretchable conductive layer 3 is preferably about 25 μm or less, and more preferably about 10 μm or more and 15 μm or less.

[0019] A bioadhesive layer 4 is provided on the lower surface (other surface) of the stretchable conductive layer 3. The bioadhesive layer 4 is configured to be adhered to the skin surface of the user. That is, the bioadhesive layer 4 has the function of holding the entire current supply device 100 on the skin surface of the user. like Figure 2As shown, the bioadhesive layer 4 is also provided in a pair on the left and right, and the two bioadhesive layers 4 have substantially the same shape. Each bioadhesive layer 4 has a size that includes the stretchable conductive layer 3 when viewed from above. In this way, by covering the entire stretchable conductive layer 3 with the bioadhesive layer 4, it is easy to supply current more evenly to the skin surface. Note that the bioadhesive layer 4 is also not limited to two, as is the case with the above-mentioned stretchable conductive layer 3, and may be three or more. In this case, the shapes of the plurality of stretchable conductive layers 3 may be the same or different. The bioadhesive layer 4 can be obtained by supplying a pre-gelled bioadhesive layer forming material to a release sheet to form a coating, immersing the release sheet in an electrolyte solution or cross-linking the bioadhesive layer 4. Note that the bioadhesive layer forming material can also be supplied to cover the stretchable conductive layer 3 and cross-linked to obtain the bioadhesive layer 4. Examples of the cross-linking (polymerization) method include a method of heating, irradiating light, or irradiating radiation to the bioadhesive layer-forming material.

[0020] Such a bioadhesive layer 4 can also expand and contract in any direction. The bioadhesive layer 4 is preferably a gel having adhesive force to the skin surface, and is particularly preferably a highly water-containing adhesive gel. That is, the bioadhesive layer 4 is preferably in a gel state. The thickness of the bioadhesive layer 4 is not particularly limited, but is preferably about 50 μm to about 1000 μm, more preferably about 100 μm to about 750 μm, from the perspective of ensuring high conformability to the skin surface of the stretchable wiring substrate 1 and the mechanical strength of the bioadhesive layer 4.

[0021] Note that the bioadhesive layer 4 is not limited to a structure that covers the entire stretchable conductive layer 3, but may also be a structure that covers a portion of the stretchable conductive layer 3. In the latter case, the stretchable wiring substrate 1 is adhered to the skin surface in a portion where the bioadhesive layer 4 is not present, and is adhered to the skin surface in a portion where the bioadhesive layer 4 is present. In this case, due to the presence of the bioadhesive layer 4, the stretchable wiring substrate 1 can be reliably maintained in an adhered state to the skin surface of the user, and muscle stimulation caused by a stronger current can be applied to the skin surface to which the stretchable conductive layer 3 is directly in close contact.

[0022] like Figure 2 As shown, the hook portion (external terminal) 5 is electrically connected to the stretchable conductive layer 3 and is inserted through the opening 21 . In this embodiment, the hook portion 5 is composed of a single component. Therefore, the number of components of the stretchable wiring substrate 1 can be reduced. In addition, since the hook portion 5 is a plate-formed product, it can be thinned. This can help achieve a lighter and / or thinner stretchable wiring substrate 1 as a whole.

[0023] The hook 5 has a columnar portion 51 inserted through the opening 21 and a shank 52 protruding laterally from the columnar portion 51, but may be a columnar member without the shank 52. The hook 5 preferably includes a soft magnetic body or a magnetized hard magnetic body. A soft magnetic material is a material that is easily magnetized by applying a magnetic field and returns to its original state by removing the magnetic field, such as pure iron, low-carbon steel, etc. Note that the hook portion 5 may also be formed by copper plating and / or nickel plating the core made of a soft magnetic material, and plating can improve the conductivity of the hook portion 5 or impart rust resistance to the hook portion 5. On the other hand, examples of magnetized hard magnetic bodies include Alnico magnets and the like.

[0024] At least a portion of the first reinforcing portion 6 is disposed on the upper surface (one surface) side of the stretchable conductive layer 3, and at least a portion of the second reinforcing portion 7 is disposed on the lower surface (the other surface) side of the stretchable conductive layer 3. Furthermore, the first reinforcing portion 6 and the second reinforcing portion 7 are configured to reinforce at least the peripheral portion of the hook portion 5 of the stretchable conductive layer 3 while holding the hook portion 5 therebetween. Thus, even if the device body 10 is repeatedly attached to and detached from the stretchable wiring substrate 1, the hook portion 5 can be prevented from falling off from the stretchable wiring substrate 1, and damage to the stretchable wiring substrate 1 can be appropriately prevented or suppressed.

[0025] In the present embodiment, the first reinforcing portion 6 is a film-shaped reinforcing film. The first reinforcing portion 6 is a flexible member having a larger Young's modulus than the stretchable sheet 2. Note that in this embodiment, the first reinforcing portion 6 is preferably a member having lower stretchability than the stretchable sheet 2 and substantially not stretching. As the constituent material of the first reinforcing portion 6, a synthetic resin with low sliding properties, corrosion resistance and high strength is preferably used, and the synthetic resin is not particularly limited, and examples thereof include polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyimide (PI), polyphenylene sulfide (PPS) or fluororesin, etc. The first reinforcing portion 6 formed of such a material has high mechanical strength, and can further enhance the effect of preventing the stretchable wiring substrate 1 from being damaged.

[0026] Alternatively, the first reinforcing portion 6 may be made of a paper material having appropriate durability (eg, cellulose nanofiber paper). The thickness of the first reinforcing portion 6 is preferably about 10 μm to about 200 μm, more preferably about 25 μm to about 150 μm, and further preferably about 50 μm to about 100 μm. Thus, the mechanical strength and non-stretchability of the first reinforcing portion 6 can be sufficiently improved. In addition, the overall thickness of the stretchable wiring substrate 1 can be suppressed.

[0027] At least a portion of the first reinforcement (reinforcement film) 6 is located between the stretchable sheet 2 and the stretchable conductive layer 3. In this case, the first reinforcement 6 can be brought close to the hook 5, so that the holding force of the first reinforcement 6 on the hook 5 can be stabilized. In addition, the first reinforcing part (reinforcing film) 6 has a through-portion 61 penetrating in the thickness direction thereof, and overlaps at least a portion of the butt portion 52 when the columnar portion 51 of the hook 5 is inserted through the through-portion 61. Thus, the holding force of the first reinforcing part 6 on the hook 5 can be further stabilized. With the above structure, in this embodiment, a part of the stretchable conductive layer 3 is located between the lug portion 52 of the hook portion 5 and the stretchable sheet 2. The stretchable conductive layer 3 is electrically connected to the hook portion (external terminal) 5 by directly contacting the lug portion 52. Thus, accurate and reliable electrical connection between the stretchable conductive layer 3 and the hook portion 5 can be achieved.

[0028] In this embodiment, the second reinforcing portion 7 is a film-shaped reinforcing film. The second reinforcing portion (reinforcing film) 7 includes a film substrate 71 and an adhesive layer 72, and the adhesive layer 72 is supported by the film substrate 71 and contacts the hook portion (external terminal) 5. According to such a structure, the second reinforcing portion 7 is easily joined to the adhesive body (laminated body) of the stretchable sheet 2, the stretchable conductive layer 3, and the first reinforcing portion 6. In addition, when manufacturing the stretchable wiring substrate 1, it is possible to prevent the position of the hook portion 5 from being offset relative to the opening portion 21 and the through portion 61. This point will be described again later. The film base material 71 can be made of the same material as the first reinforcing portion (reinforcing film) 6 . The thickness of the film substrate 71 is not particularly limited, but is preferably about 25 μm to about 250 μm, more preferably about 50 μm to about 200 μm, and further preferably about 50 μm to about 100 μm. This can sufficiently improve the mechanical strength and non-stretchability of the film substrate 71.

[0029] Examples of the material constituting the adhesive layer 72 include acrylic adhesives, polyurethane adhesives, silicone adhesives, natural rubber adhesives, synthetic rubber adhesives, etc. These adhesives may be used alone or in combination of two or more. The thickness of the adhesive layer 72 is not particularly limited, but is preferably about 5 μm to about 200 μm, more preferably about 15 μm to about 150 μm, and even more preferably about 15 μm to about 50 μm.

[0030] The above-mentioned stretchable wiring substrate 1 can be manufactured as follows. [1] First, a stretchable sheet 2 with a carrier sheet CS attached thereto is prepared, and a first reinforcement portion (reinforcement film) 6 is attached thereto (see Figure 3 (a)). Note that Figure 3 (a) From the perspective of the user, it is upside down. [2] Next, the through-portion CS1 is continuously formed on the carrier sheet CS, the opening 21 is continuously formed on the stretchable sheet 2, and the through-portion 61 is continuously formed on the first reinforcing portion 6 (see Figure 3 A). This can be easily formed by, for example, punching, drilling, laser processing, etc. [3] Then, a stretchable conductive layer 3 having a predetermined pattern is formed on the upper surface (lower surface in the use state) of the first reinforcing portion 6 and the stretchable sheet 2 (see Figure 3 (a)). The stretchable conductive layer 3 can be easily formed by printing the stretchable conductive material. Examples of the printing method include screen printing, droplet ejection (inkjet), gravure printing, roll coating, and blade coating.

[0031] [4] Next, the hook portion 5 is fixed to the upper surface of the adhesive layer 72 of the second reinforcement portion (reinforcement film) 7 (see Figure 3 (b)). [5] Then, the second reinforcing part 7 to which the hook part 5 is fixed is attached to the stretchable conductive layer 3 (see Figure 3 (c) At this time, the hook 5 is inserted through the through-portion 61 and the opening 21, and its upper end (front end) is located in the through-portion CS1. At this time, the shank 52 of the hook 5 is in contact with the stretchable conductive layer 3. Since the hook portion 5 is fixed to the adhesive layer 72 of the second reinforcing portion 7 , positional deviation during the operation of this step [5] can be appropriately prevented. [6] Next, the pasted body (laminated body) is heated and pressurized as required. As described above, since the stretchable conductive layer 3 is made of a stretchable conductive material, the elastic body is softened by heating and pressurizing, thereby improving the adhesion between the conductive filler and the hook 5. Therefore, the connection reliability between the stretchable conductive layer 3 and the hook 5 is improved.

[0032] [7] Then, the bioadhesive layer 4 is attached to the lower surface of the adherend (see Figure 3 (d)). In addition, it is preferable to attach a release film to the lower surface of the bioadhesive layer 4 until use. This improves the handling properties of the bioadhesive layer 4 during production and the handling properties of the stretchable wiring board 1 after production. Thereafter, punching is performed to obtain the outer shape of the stretchable wiring substrate 1 , and the carrier sheet CS is peeled off to complete the stretchable wiring substrate 1 .

[0033] A device main body 10 is mounted on the stretchable wiring substrate 1 . The device body 10 has a magnet hook (connection terminal) 101 on its lower surface. The magnet hook 101 has a recess 101 a in its center. In addition, a ring-shaped permanent magnet (for example, a ferrite magnet or a neodymium magnet) 101 b is accommodated in the magnet hook 101 . By connecting the magnet hook portion (connection terminal) 101 to the hook portion (external terminal) 5, such a device body 10 is mounted on the stretchable wiring substrate 1. Specifically, by inserting the tip of the columnar portion 51 of the male hook portion 5 into the recess 101a of the female magnet hook portion 101, it is possible to make physical contact and ensure electrical connection. In addition, the mechanical connection between the magnet hook portion 101 and the hook portion 5 can also be ensured by the magnetic force of the permanent magnet 101b. Therefore, high connection reliability between the stretchable wiring substrate 1 and the device body 10 can be obtained.

[0034] In addition, according to such a structure, when the magnetic hook portion (connection terminal having magnetic force) 101 is brought close to the hook portion (external terminal) 5 from the upper side (one side), the hook portion 5 is attracted by the magnetic hook portion 101, and the shank portion 52 presses the stretchable conductive layer 3. Thus, the electrical connection between the hook portion 5 and the stretchable conductive layer 3 can be further improved. Furthermore, the device body 10 is configured to supply current to the stretchable conductive layer 3 in a state where the device body 10 is mounted on the stretchable wiring substrate 1 . Note that, in this embodiment, the case where the connection terminal is formed of a magnet hook member is shown, but the connection terminal may be formed of a spring hook member.

[0035] like Figure 1 As shown, two operation buttons 102 are provided on the surface of the device body 10. These operation buttons 102 can change at least one of the power supply amount and the power supply method (mode). Changing the power supply amount also includes turning on / off the power supply (power source). In addition, a power supply unit, a control unit, and a circuit unit (none of which are shown) are provided inside the device body 10. The power supply unit, the circuit unit, and the two operation buttons 102 are electrically connected to the control unit, and the two magnet hooks 101 are electrically connected to the circuit unit. The power supply unit is configured to supply power to the stretchable conductive layer 3. The power supply unit may be, for example, a dry cell, a solar cell, a fuel cell, a lithium ion secondary battery, a solid-state battery, a lithium polymer battery, etc. Alternatively, the power supply unit may be a connector to which a power cable can be connected.

[0036] The control unit has a built-in computing element and a storage element. The computing element is composed of, for example, a central processing unit (CPU), a microprocessing unit (MPU), etc. The computing element realizes various functions related to the current supply device 100 by reading a predetermined program stored in the storage element. That is, the information processing executed by the software stored in the storage element is specifically realized by the computing element. Note that the arithmetic element is not limited to a single arithmetic element, but a plurality of arithmetic elements may be provided according to differences in functions.

[0037] The storage element stores various information defined in the above description. This can be implemented, for example, as a storage device such as a solid state drive (SSD) that stores various programs related to the current supply device 100 executed by the operation element, or as a memory such as a random access memory (RAM) that stores temporary necessary information (parameters, sequences, etc.) related to the operation of the program. In addition, the storage element stores various programs and variables related to the current supply device 100 executed by the computing element.

[0038] The circuit unit includes, for example, a drive circuit, an output waveform generating circuit, a transformer, a switching circuit, and the like. The control unit is configured to control the power supplied from the power supply unit via the circuit unit to the stretchable conductive layer 3. Here, power control means setting at least one of voltage value, current value, waveform, frequency, pulse width, energization direction, and energization time. In this embodiment, through the control of the control unit, the current supplied by the device body 10 can be a current for applying muscle stimulation, a current for warming the skin surface, etc. The type (mode) of electric current supplied from the device main body 10 can be changed by operation of the operation button 102 .

[0039] <Second Embodiment> Next, a second embodiment of the current supply device of the present invention will be described. Hereinafter, the current supply device 100 of the second embodiment will be described mainly with respect to the differences between the current supply device 100 of the first embodiment, and descriptions of the same matters will be omitted. The current supply device 100 of the second embodiment is the same as the current supply device 100 of the first embodiment except that the structure of the stretchable wiring substrate 1 is different. Figure 4 It is a cross-sectional view showing a stretchable wiring substrate according to a second embodiment. Note that in the following instructions, Figure 4 The upper side is also called the "surface" or "upper", and the lower side is also called the "inside" or "lower".

[0040] The stretchable wiring board 1 in the second embodiment further includes a conductive connection member 8 interposed between the hook portion 52 and the stretchable conductive layer 3 to electrically connect them. This structure can further improve the mechanical and electrical connection between the hook portion 5 and the stretchable conductive layer 3. The conductive connecting member 8 may be a metal foil, but is preferably a conductive double-sided tape. When the conductive double-sided tape is used, the hook portion 5 and the stretchable conductive layer 3 can be reliably connected with a simple structure. The conductive double-sided tape may be composed of an adhesive tape in which conductive particles including silver, gold, nickel, etc. are dispersed. In this case, Figure 3 Before the step (b), the conductive connecting member 8 may be attached to a predetermined position of the stretchable conductive layer 3 . Note that in the stretchable wiring substrate 1 of the first embodiment and the second embodiment, the first reinforcing portion (reinforcing film) 6 may be provided on the upper surface side of the stretchable sheet 2. In addition, the second reinforcing portion (reinforcing film) 7 may omit the adhesive layer 72 and be composed only of the film base material 71. In this case, when the pasted body (laminated body) is heated and pressurized in the manufacturing process of the stretchable wiring substrate 1, for example, the first reinforcing portion (reinforcing film) 6 and the film base material 71 may be joined by welding.

[0041] <Third Embodiment> Next, a third embodiment of the current supply device of the present invention will be described. Hereinafter, the current supply device 100 ′ of the third embodiment will be described mainly with respect to the differences between the current supply device 100 of the first embodiment and the second embodiment, and descriptions of the same matters will be omitted. The current supply device 100 ′ of the third embodiment is the same as the current supply device 100 ′ of the first and second embodiments, except that the structures of the mounting parts of the stretchable wiring substrate 1 and the device body 10 are different. Figure 5 The figures show a disassembled state of the current supply device of the third embodiment ((a) is a top view of the stretchable wiring substrate, and (b) is a bottom view of the device body). Figure 6 yes Figure 5 BB line section view in. Note that in the following instructions, Figure 5 In (a), the front side of the paper is described as the "front" or "upper", and the back side of the paper is described as the "back" or "lower". Figure 5 In (b), the back side of the paper is described as "front" or "upper", and the front side of the paper is described as "back" or "lower". Figure 6 The upper side is described as the "surface" or "upper", and the lower side is described as the "inside" or "lower".

[0042] like Figure 5 As shown in (b), the device body 10' includes a columnar portion 101' as a connection terminal. like Figure 5 (a) and Figure 6 As shown, the stretchable wiring substrate 1' includes a columnar magnet portion 5', and the columnar magnet portion 5' includes a magnetized hard magnetic body as an external terminal. The first reinforcement portion 6' is a block-shaped reinforcement block. In addition, the first reinforcement portion (reinforcement block) 6' has a through portion 61' that penetrates in the thickness direction thereof and exposes the magnet portion (external terminal) 5'. And, it is configured to form a recessed portion by the through portion 61' and the magnet portion 5', and the columnar portion 101' is inserted into the recessed portion. On the other hand, the second reinforcing portion 7' ​​is also a reinforcing film in the form of a film. The second reinforcing portion (reinforcing film) 7' includes a film substrate 71' and a conductive adhesive layer 72' supported by the film substrate 71' and in contact with the magnet portion (external terminal) 5'. The film substrate 71' can have the same structure as the above-mentioned film substrate 71. In addition, the adhesive layer 72' can be formed by dispersing conductive particles (conductive filler) in the above-mentioned adhesive layer 72.

[0043] Furthermore, in the present embodiment, the magnet portion (external terminal) 5 ′ is electrically connected to the stretchable conductive layer 3 via the adhesive layer 72 ′. Furthermore, the first reinforcing part (reinforcing block) 6' is bonded to the second reinforcing part (reinforcing film) 7' via a non-conductive adhesive layer 9. Such an adhesive layer 9 may have the same structure as the adhesive layer 72 described above. According to the current supply device 100 ′ of the third embodiment, the same operation and effects as those of the current supply device 100 of the first and second embodiments can be achieved.

[0044] Note that in this embodiment, since the magnet portion 5' is provided as an external terminal on the stretchable wiring substrate 1', the columnar portion 101' as the connection terminal of the device body 10' may be magnetic or non-magnetic. In addition, in the case where the columnar portion 101' has a magnetic structure, the external terminal of the stretchable wiring substrate 1' may be composed of a non-magnetic soft magnetic body. In addition, the position of the lower surface of the first reinforcement portion (reinforcement block) 6' is not limited to Figure 6 The position shown may be a position above the stretch sheet 2 or any position within the thickness range of the stretch sheet 2 and the stretch conductive layer 3. At any position, the magnet portion (external terminal) 5' can be stably held between the first reinforcement portion (reinforcement block) 6' and the second reinforcement portion (reinforcement film) 7'.

[0045] <Fourth Embodiment> Next, a fourth embodiment of the current supply device of the present invention will be described. Hereinafter, the current supply device 100 ′ of the fourth embodiment will be described mainly with respect to the differences between the current supply device 100 ′ of the third embodiment, and descriptions of the same matters will be omitted. The current supply device 100 ′ of the fourth embodiment is the same as the current supply device 100 ′ of the third embodiment except that the structure of the stretchable wiring substrate 1 ′ is different. Figure 7 It is a cross-sectional view showing a stretchable wiring substrate according to a fourth embodiment. Note that in the following instructions, Figure 7 The upper side is also called the "surface" or "upper", and the lower side is also called the "inside" or "lower".

[0046] Compared with the first reinforcing portion (reinforcing block) 6' of the third embodiment, the first reinforcing portion (reinforcing block) 6' of the fourth embodiment has its lower most portion located in the opening 21 of the stretchable sheet 2. This can contribute to a thinner stretchable wiring board 1'. The conductive adhesive layer 72' is bonded to the first reinforcing portion 6' or the stretchable conductive layer 3 via the adhesive layer 9. The adhesive layer 72' is in contact with the magnet portion 5' and is in contact with the stretchable conductive layer 3 at a position not shown. In such a structure, the magnet portion 5 ′ is electrically connected to the stretchable conductive layer 3 via the adhesive layer 72 ′.

[0047] Furthermore, in this embodiment, since the adhesive layer 72' has conductivity, a large space 11' is formed in the central portion of the stretchable wiring substrate 1', and the left and right adhesive layers 72' are in contact with each other to prevent conduction. Note that in such a structure, the adhesive layer 9 may be omitted and the conductive adhesive layer 72 ′ may be bonded to the first reinforcing portion 6 ′. In this case, the left and right adhesive layers may be kept separated. In addition, the present invention can also be provided in the following various forms.

[0048] (1) A stretchable wiring substrate, characterized in that it comprises: a stretchable sheet, a stretchable conductive layer, an external terminal, a first reinforcement portion, and a second reinforcement portion; the stretchable sheet has an opening portion extending through the stretchable conductive layer in a thickness direction thereof; the stretchable conductive layer is supported by the stretchable sheet; the external terminal is electrically connected to the stretchable conductive layer and inserted through the opening portion; at least a portion of the first reinforcement portion is arranged on one surface side of the stretchable conductive layer, at least a portion of the second reinforcement portion is arranged on the other surface side of the stretchable conductive layer, the external terminal is held between the first reinforcement portion and the second reinforcement portion, and at least a peripheral portion of the external terminal of the stretchable conductive layer is reinforced.

[0049] (2) The stretchable wiring substrate according to (1) above, wherein the first reinforcement portion is a film-shaped reinforcement film.

[0050] (3) The stretchable wiring substrate according to (2) above, wherein at least a portion of the reinforcement film is located between the stretchable sheet and the stretchable conductive layer.

[0051] (4) A stretchable wiring substrate according to (2) or (3) above, wherein the external terminal has a columnar portion inserted through the opening and a butt portion protruding laterally from the columnar portion, and the reinforcing film has a through portion penetrating in a thickness direction thereof, and when the columnar portion is inserted through the through portion, the reinforcing film overlaps with at least a portion of the butt portion.

[0052] (5) The stretchable wiring substrate according to the above (4), wherein a portion of the stretchable conductive layer is located between the shank portion and the stretchable sheet.

[0053] (6) The stretchable wiring substrate according to (5) above, wherein the stretchable conductive layer is electrically connected to the external terminal by being in direct contact with the shank portion.

[0054] (7) The stretchable wiring substrate according to (5) or (6) above, further comprising a conductive connection member interposed between the butt portion and the stretchable conductive layer and electrically connecting the butt portion and the stretchable conductive layer.

[0055] (8) A stretchable wiring substrate according to any one of (5) to (7) above, wherein the external terminal includes a soft magnetic material or a magnetized hard magnetic material, and is configured so that when a connecting terminal having a magnetic force is brought close to the external terminal from the surface side of one side, the external terminal is attracted by the connecting terminal and the butt portion presses the stretchable conductive layer.

[0056] (9) A stretchable wiring substrate according to (1) above, wherein the external terminal includes a soft magnetic body or a magnetized hard magnetic body, and the first reinforcing portion is a block-shaped reinforcing block having a through portion that penetrates in a thickness direction thereof and exposes the external terminal.

[0057] (10) The stretchable wiring board according to (9) above, wherein the second reinforcement portion is a film-shaped reinforcement film including a film substrate and a conductive adhesive layer supported by the film substrate and in contact with the external terminal.

[0058] (11) The stretchable wiring substrate according to the above (10), wherein the external terminal is electrically connected to the stretchable conductive layer via the adhesive layer.

[0059] (12) The stretchable wiring substrate according to any one of (1) to (11) above, wherein the second reinforcement portion is a film-shaped reinforcement film, the reinforcement film including a film substrate and an adhesive layer supported by the film substrate and in contact with the external terminal.

[0060] (13) The stretchable wiring substrate according to any one of (1) to (12) above, wherein the external terminal is formed of a single component.

[0061] (14) The stretchable wiring substrate according to any one of (1) to (13) above, further comprising a bio-adhesive layer provided on the other surface side and attached to a skin surface of a user.

[0062] (15) The stretchable wiring substrate according to (14) above, wherein the bioadhesive layer is in a gel state.

[0063] (16) A device for supplying electric current to a biological body, characterized in that it comprises a stretchable wiring substrate and a device body as described in any one of (1) to (15) above, wherein the stretchable wiring substrate is configured to use the stretchable conductive layer as the skin side of the user, and the device body has a connecting terminal, which is installed on the stretchable wiring substrate by connecting the connecting terminal to the external terminal, and is configured to supply electric current to the stretchable conductive layer. Of course, it's not limited to this.

[0064] In summary, although various embodiments of the present invention have been described, these embodiments are presented only as examples and are not intended to limit the scope of the present invention. The new embodiment can be implemented in various other ways, and various omissions, substitutions and modifications can be made without departing from the gist of the present invention. The embodiment or its variation can be included in the scope or gist of the invention, and can be included in the invention described in the claims and its equivalent. Description of Reference Numerals

[0065] 100: current supply device 100': current supply device 1: Stretchable wiring board 1': Stretchable wiring board 11': Large space 2: Stretchable sheet 21: Opening 3: Stretchable conductive layer 4: Bioadhesive layer 5: Hook 51: Columnar part 52: E part 5': Magnet part 6: The first reinforcement 61: Through 6': First reinforcement 61': Through 7: Second reinforcement 71: Film substrate 72: Adhesive layer 7': Second reinforcement 71': Membrane substrate 72': Adhesive layer 8: Conductive connecting parts 9: Adhesive layer 10: Device body 10': Device body 101: Magnetic hook 101': Column 101a: concave part 101b: Permanent Magnets 102: Operation button CS: Carrier sheet CS1: Through-section

Claims

1. A stretchable wiring substrate, characterized in that: have: A stretchable sheet, a stretchable conductive layer, an external terminal, a first reinforcement portion, and a second reinforcement portion; The stretchable sheet has an opening that penetrates in the thickness direction thereof; The stretchable conductive layer is supported by the stretchable sheet; The external terminal is electrically connected to the stretchable conductive layer and inserted through the opening; At least a portion of the first reinforcement portion is arranged on one surface side of the stretchable conductive layer, and at least a portion of the second reinforcement portion is arranged on the other surface side of the stretchable conductive layer. The external terminal is held between the first reinforcement portion and the second reinforcement portion, and at least the peripheral portion of the external terminal of the stretchable conductive layer is reinforced.

2. The stretchable wiring substrate according to claim 1, wherein The first reinforcement portion is a film-shaped reinforcement film.

3. The stretchable wiring substrate according to claim 2, wherein: At least a portion of the reinforcement film is located between the stretchable sheet and the stretchable conductive layer.

4. The stretchable wiring substrate according to claim 2 or 3, wherein: The external terminal includes a columnar portion inserted into the opening and a bar portion protruding laterally from the columnar portion. The reinforcing film has a through portion penetrating the reinforcing film in a thickness direction thereof, and overlaps with at least a portion of the flange portion when the columnar portion is inserted through the through portion.

5. The stretchable wiring substrate according to claim 4, wherein A portion of the stretchable conductive layer is located between the shank portion and the stretchable sheet.

6. The stretchable wiring substrate according to claim 5, wherein: The stretchable conductive layer is electrically connected to the external terminal by directly contacting the butt portion.

7. The stretchable wiring substrate according to claim 5 or 6, wherein: The invention further comprises a conductive connecting member interposed between the butt portion and the stretchable conductive layer and electrically connecting the butt portion and the stretchable conductive layer.

8. The stretchable wiring substrate according to any one of claims 5 to 7, wherein The external terminal comprises a soft magnetic body or a magnetized hard magnetic body, The structure is such that when the connection terminal having magnetic force is brought close to the external terminal from the one surface side, the external terminal is attracted by the connection terminal and the shank portion presses the stretchable conductive layer.

9. The stretchable wiring substrate according to claim 1, wherein The external terminal comprises a soft magnetic body or a magnetized hard magnetic body, The first reinforcement part is a block-shaped reinforcement block, The reinforcing block has a through portion that penetrates the reinforcing block in a thickness direction and exposes the external terminal.

10. The stretchable wiring substrate according to claim 9, wherein The second reinforcement part is a film-shaped reinforcement film, The reinforcing film includes a film base material and an adhesive layer having conductivity and supported by the film base material and in contact with the external terminal.

11. The stretchable wiring substrate according to claim 10, wherein The external terminal is electrically connected to the stretchable conductive layer via the adhesive layer.

12. The stretchable wiring substrate according to any one of claims 1 to 11, wherein The second reinforcement part is a film-shaped reinforcement film, The reinforcing film includes a film base material and an adhesive layer supported by the film base material and in contact with the external terminal.

13. The stretchable wiring substrate according to any one of claims 1 to 12, wherein: The external terminal is composed of a single component.

14. The stretchable wiring substrate according to any one of claims 1 to 13, wherein The device further includes a bioadhesive layer provided on the other surface side and attached to the skin surface of the user.

15. The stretchable wiring substrate according to claim 14, wherein The bioadhesive layer is in a gel state.

16. A device for supplying electric current to a living body, characterized in that: have: The stretchable wiring substrate and the device body according to any one of claims 1 to 15, The stretchable wiring substrate is configured so that the stretchable conductive layer is used as the skin side of the user. The device body includes a connection terminal, is mounted on the stretchable wiring substrate by connecting the connection terminal to the external terminal, and is configured to supply current to the stretchable conductive layer.

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