Flexible wiring board and current supply device
Patent Information
- Application Number
- JP2025112355
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2025-07-02
- Publication Date
- 2025-10-02
Smart Images
Figure 00000000_0000_ABST
Abstract
Description
[Technical Field]
[0001] The present invention relates to a stretchable wiring board and a current supply device. [Background technology]
[0002] BACKGROUND ART Electrical muscle stimulation devices (EMS devices) have been used as devices for supplying electric current to living organisms (see Patent Document 1). The EMS device (1) described in Patent Document 1 includes an external device (3) and an elastic wiring board (10), and the elastic wiring board (10) is provided with caulking-type conductive hooks (21a, 21b). The conductive hooks (21a, 21b) are assembled by caulking a cap portion (210) and a protrusion portion (220), respectively, so as to sandwich a non-elastic substrate (12). [Prior art documents] [Patent documents]
[0003] [Patent Document 1] Patent Publication No. 2021-34387 Summary of the Invention [Problem to be solved by the invention]
[0004] However, because the cap portion (210) and the protrusion (220) of the conductive hooks (21a, 21b) are crimped to sandwich the rigid non-stretchable substrate, the protrusion (220) is exposed to the outside. To avoid this, it is necessary to use insulating tape to cover the end of the protrusion (220). This results in a thick film of the stretchable wiring substrate (10) (EMS device (1)) and makes the assembly process more complicated. In view of the above circumstances, the present invention provides a stretchable wiring board that has a simple configuration and is capable of reliable mechanical and electrical connection with the device main body, and a current supply device that includes this stretchable wiring board. [Means for solving the problem]
[0005] According to one aspect of the present invention, there is provided a stretchable wiring board. This stretchable wiring board comprises a stretchable sheet, a stretchable conductive layer, an external terminal, a first reinforcing portion, and a second reinforcing portion. The stretchable sheet has an opening penetrating through it in the thickness direction. 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 reinforcing portion is disposed on one side of the stretchable conductive layer, and at least a portion of the second reinforcing portion is disposed on the other side of the stretchable conductive layer, and they are configured to hold the external terminal therebetween and to reinforce at least the periphery of the external terminal of the stretchable conductive layer.
[0006] According to this aspect, a reliable mechanical connection and electrical connection with the device main body can be achieved with a simple configuration. [Brief explanation of the drawings]
[0007] [Figure 1] 1A and 1B are diagrams showing the disassembled state of the current supply device according to the first embodiment ((a) is a plan view of the stretchable wiring board, (b) is a plan view of the device main body, and (c) is a bottom view of the device main body). [Figure 2] FIG. 2 is a cross-sectional view taken along line AA in FIG. [Figure 3] 2A to 2C are cross-sectional views showing the manufacturing process of the stretchable wiring board of FIG. [Figure 4] FIG. 4 is a cross-sectional view showing a stretchable wiring board according to a second embodiment. [Figure 5] 10A and 10B are views showing an exploded state of a current supply device according to a third embodiment ((a) is a plan view of a stretchable wiring board, and (b) is a bottom view of the device main body). [Figure 6] FIG. 6 is a cross-sectional view taken along line BB in FIG. 5. [Figure 7] FIG. 10 is a cross-sectional view showing a stretchable wiring board according to a fourth embodiment. DETAILED DESCRIPTION OF THE INVENTION
[0008] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings. Various features shown in the following embodiments can be combined with each other.
[0009] Incidentally, the program for realizing the software appearing in this embodiment may be provided as a non-transitory computer-readable medium, or may be provided so that it can be downloaded from an external server, or may be provided so that the program is started on an external computer and its functions are realized on a client terminal (so-called cloud computing).
[0010] In addition, in this embodiment, the term "unit" may include, for example, a combination of hardware resources implemented by a circuit in the broad sense and software information processing that can be specifically realized by these hardware resources. Furthermore, in this embodiment, various types of information are handled, and this information may be represented by, for example, physical values of signal values representing voltage and current, high and low signal values as a binary bit set consisting of 0 or 1, or quantum superposition (so-called quantum bits), and communication and calculations may be performed on a circuit in the broad sense.
[0011] In addition, a circuit in the broad sense is a circuit realized by at least an appropriate combination of a circuit, circuitry, processor, memory, etc. That is, it includes an application specific integrated circuit (ASIC), a programmable logic device (e.g., a simple programmable logic device (SPLD), a complex programmable logic device (CPLD), and a field programmable gate array (FPGA)), etc.
[0012] First Embodiment First, a first embodiment of the current supply device of the present invention will be described. FIG. 1 is a diagram showing an exploded state of a current supply device according to a first embodiment ((a) is a plan view of a stretchable wiring board, (b) is a plan view of a device main body, and (c) is a bottom view of the device main body). FIG. 2 is a cross-sectional view taken along line AA in FIG. 1. FIG. 3 is a cross-sectional view showing a manufacturing process of the stretchable wiring board of FIG. 1. In the following description, the front side of the paper in Figures 1(a) and 1(b) will also be referred to as the "front" or "top," and the back side of the paper will also be referred to as the "back" or "bottom." The back side of the paper in Figure 1(c) will also be referred to as the "front" or "top," and the front side of the paper will also be referred to as the "back" or "bottom." Furthermore, the upper side in Figures 2 and 3(b) to 3(d) will also be referred to as the "front" or "top," and the lower side will also be referred to as the "back" or "bottom." The lower side in Figure 3(a) will also be referred to as the "front" or "top," and the upper side will also be referred to as the "back" or "bottom."
[0013] The current supply device 100 shown in FIG. 1 is a device that supplies current to a living organism, and includes a stretchable wiring board 1 and a device main body 10 that is attached to the stretchable wiring board 1. As shown in Fig. 2, the stretchable wiring board 1 comprises a stretchable sheet 2, a stretchable conductive layer 3, a bioadhesive layer 4, a pair of hook portions (external terminals) 5, a first reinforcing portion 6, and a second reinforcing portion 7. In 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 in a see-through manner. The stretchable wiring board 1 is configured so that the stretchable conductive layer 3 is used as the skin-facing side of the user. As shown in FIG. 1, the stretchable sheet 2 (stretchable wiring board 1) is in a long shape. In this configuration, a plurality of stretchable wiring boards 1 having shapes suitable for the area of the skin surface to be treated may be provided. In this case, by selecting a predetermined stretchable wiring board 1 and using it by attaching it to the device main body 10, it becomes easier to more reliably perform skin treatment according to the user's needs.
[0014] The stretchable sheet 2 has the function of supporting each part including the stretchable conductive layer 3. This stretchable sheet 2 is stretchable in any direction. There are no particular limitations on the constituent material of the stretchable sheet 2, but examples include elastomer materials such as nitrile rubber, latex rubber, urethane-based elastomer, etc. By using a urethane-based elastomer sheet, particularly one used for medical purposes, as the stretchable sheet 2, a high level of safety can be achieved even when attached to the skin of the human body. The thickness of the elastic sheet 2 is not particularly limited, but from the viewpoint of not hindering the expansion and contraction movement of the skin surface of the living body to which the elastic wiring board 1 is applied, it is preferably about 100 μm or less, more preferably about 25 μm or less, and even more preferably about 10 μm or less.
[0015] The maximum elongation of the stretchable sheet 2 is preferably about 10% or more, more preferably about 50% or more, even more preferably about 100% or more, and particularly preferably about 200% or more. If the stretchable sheet 2 is made of the materials described above, it is possible to achieve 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 at which the sheet can be elastically deformed in one in-plane direction. In this specification, elongation refers to the percentage of elongation in one in-plane direction due to the application of force, compared to the dimensions when no external force is applied (0% elongation dimensions). For example, an elongation of 50% is 1.5 times the 0% elongation dimensions, and an elongation of 100% is twice the 0% elongation dimensions.
[0016] The stretchable sheet 2 has an opening 21 penetrating through it in the thickness direction. The hook part 5 is inserted into this 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) of the stretchable sheet 2. This stretchable conductive layer 3 may be disposed in direct contact with the stretchable sheet 2, or may be disposed via an intermediate layer for any purpose. 1, a pair of elastic conductive layers 3 are provided on the left and right sides, and the two elastic conductive layers 3 have approximately the same shape. However, the number of elastic conductive layers 3 is not limited to two, and there may be three or more. In this case, the multiple elastic conductive layers 3 may have the same shape or different shapes.
[0017] Such a stretchable conductive layer 3 can also stretch in any direction. The stretchable conductive layer 3 can be made 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 urethane-based thermoplastic elastomers, and rubber materials such as ethylene propylene rubber, neoprene rubber, natural rubber, and silicone rubber. If such a composite material is used, the stretchable conductive layer 3 can be produced relatively easily using a printing method.
[0018] The thickness and width of the elastic conductive layer 3 can be determined based on the resistance change of the elastic conductive layer 3 when the elastic sheet 2 is stretched, as well as the constraints of the overall thickness and width of the elastic wiring board 1. From the viewpoint of ensuring good stretchability by following the dimensional changes of the stretchable sheet 2 when stretched, 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 elastic 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. This bioadhesive layer 4 is configured to be attached to the skin surface of the user. In other words, the bioadhesive layer 4 has the function of holding the entire current supply device 100 on the skin surface of the user. As shown in Figure 2, a pair of bioadhesive layers 4 are also provided on the left and right sides, and the two bioadhesive layers 4 have approximately the same shape. Each bioadhesive layer 4 is large enough to encompass the stretchable conductive layer 3 in a plan view. By covering the entire stretchable conductive layer 3 with the bioadhesive layer 4 in this way, it becomes easier to supply current more uniformly to the skin surface. Note that, like the aforementioned stretchable conductive layer 3, the number of bioadhesive layers 4 is not limited to two, and may be three or more. In this case, the multiple stretchable conductive layers 3 may have the same or different shapes. The bioadhesive layer 4 can be obtained by supplying the bioadhesive layer-forming material before gelation onto a release sheet to form a coating film, and then impregnating the coating with an electrolyte or crosslinking the material. Alternatively, the bioadhesive layer-forming material before gelation may be supplied so as to cover the stretchable conductive layer 3, and then crosslinked. Examples of the crosslinking (polymerization) method include methods in which the bioadhesive layer-forming material is heated, irradiated with light, or irradiated with radiation.
[0020] Such a bioadhesive layer 4 is also stretchable in any direction. The bioadhesive layer 4 is preferably a gel having adhesive strength to the skin surface, particularly a highly water-containing adhesive gel, that is, the bioadhesive layer 4 is preferably in the form of a gel. The thickness of the bioadhesive layer 4 is not particularly limited, but from the viewpoint of ensuring high conformability of the elastic wiring substrate 1 to the skin surface and the mechanical strength of the bioadhesive layer 4, it is preferably about 50 μm or more and 1000 μm or less, and more preferably about 100 μm or more and 750 μm or less.
[0021] The bioadhesive layer 4 is not limited to a configuration that covers the entire stretchable conductive layer 3, but can also be a configuration that covers only a portion of the stretchable conductive layer 3. In the latter case, the stretchable wiring board 1 is attached such that the stretchable conductive layer 3 directly adheres to the skin surface in areas where the bioadhesive layer 4 is not present, and the bioadhesive layer 4 directly adheres to the skin surface in areas where the bioadhesive layer 4 is present. In this case, the presence of the bioadhesive layer 4 ensures that the stretchable wiring board 1 remains adhered to the skin surface of the user, while a stronger current can be used to stimulate the muscles on the skin surface where the stretchable conductive layer 3 directly adheres.
[0022] As shown in FIG. 2, 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 part 5 is configured as a single part. This makes it possible to reduce the number of parts in the stretchable wiring board 1. Furthermore, since the hook part 5 is a molded plate product, it is possible to make it thinner. This can contribute to making the stretchable wiring board 1 as a whole lighter and / or thinner.
[0023] The hook part 5 has a columnar part 51 inserted into the opening 21 and a flange part 52 protruding laterally from the columnar part 51, but may have a shape in which the flange part 52 is omitted, i.e., may be a columnar part. In addition, the hook part 5 preferably contains a soft magnetic material or a magnetized hard magnetic material. A soft magnetic material is a material that is easily magnetized when a magnetic field is applied and returns to its original state when the magnetic field is removed, and examples thereof include pure iron and low-carbon steel. The hook part 5 may be formed by plating a core made of a soft magnetic material with copper and / or nickel. Plating the hook part 5 can increase the conductivity of the hook part 5 and provide it with rust resistance. On the other hand, examples of magnetized hard magnetic materials include alnico magnets.
[0024] At least a portion of the first reinforcing part 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 part 7 is disposed on the lower surface (the other surface) side of the stretchable conductive layer 3. The hook part 5 is held between them, and the hook part 5 is configured to reinforce at least the periphery of the hook part 5 of the stretchable conductive layer 3. This prevents the hook part 5 from falling off the stretchable wiring board 1 even if the device main body 10 is repeatedly attached to and detached from the stretchable wiring board 1, and can suitably prevent or suppress damage to the stretchable wiring board 1.
[0025] In this embodiment, the first reinforcing portion 6 is a reinforcing film in the form of a film. The first reinforcing section 6 is a flexible member, and has a greater Young's modulus than the stretchable sheet 2. In this embodiment, the first reinforcing section 6 is preferably a member that is less stretchable than the stretchable sheet 2, and that is substantially inflexible. It is preferable to use a synthetic resin with low sliding properties, corrosion resistance, and high strength as the constituent material of the first reinforcing portion 6. Such synthetic resin is not particularly limited, but examples thereof include polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyimide (PI), polyphenylene sulfide (PPS), and fluororesin. The first reinforcing portion 6 made of such a material has high mechanical strength, and can further improve the effect of preventing damage to the stretchable wiring board 1.
[0026] For the first reinforcing portion 6, a paper material (for example, cellulose nanofiber paper) or the like having a suitable durability can also be used. The thickness of the first reinforcing part 6 is preferably about 10 μm or more and 200 μm or less, more preferably about 25 μm or more and 150 μm or less, and even more preferably about 50 μm or more and 100 μm or less. This makes it possible to sufficiently increase the mechanical strength and non-stretchability of the first reinforcing part 6. It is also possible to reduce the overall thickness of the stretchable wiring board 1.
[0027] At least a portion of the first reinforcing part (reinforcing film) 6 is located between the stretchable sheet 2 and the stretchable conductive layer 3. In this case, the first reinforcing part 6 can be brought close to the hook part 5, and therefore the holding force of the first reinforcing part 6 on the hook part 5 can be made more stable. The first reinforcing part (reinforcing film) 6 has a through-hole 61 that penetrates through the first reinforcing part (reinforcing film) in the thickness direction, and overlaps with at least a part of the flange part 52 when the columnar part 51 of the hook part 5 is inserted through the through-hole 61. This further stabilizes the holding force of the hook part 5 by the first reinforcing part 6. With the above-described configuration, in this embodiment, a portion of the stretchable conductive layer 3 is located between the flange 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 flange portion 52. This allows for accurate and reliable electrical connection between the stretchable conductive layer 3 and the hook portion 5.
[0028] In this embodiment, the second reinforcing portion 7 is a film-like reinforcing film. This second reinforcing portion (reinforcing film) 7 includes a film substrate 71 and an adhesive layer 72 supported by the film substrate 71 and in contact with the hook portion (external terminal) 5. This configuration makes it easier to bond the second reinforcing portion 7 to the attachment body (laminate) of the stretchable sheet 2, the stretchable conductive layer 3, and the first reinforcing portion 6. Furthermore, when manufacturing the stretchable wiring board 1, it is possible to prevent misalignment of the hook portion 5 with respect to the opening 21 and the through portion 61. This point will be explained again later. The film substrate 71 may 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 250 μm, more preferably about 50 μm to 200 μm, and even more preferably about 50 μm to 100 μm, which allows the mechanical strength and non-stretchability of the film substrate 71 to be sufficiently increased.
[0029] Examples of materials constituting the adhesive layer 72 include acrylic adhesives, urethane 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 200 μm, more preferably about 15 μm to 150 μm, and even more preferably about 15 μm to 50 μm.
[0030] The above-described stretchable wiring board 1 can be manufactured as follows. [1] First, prepare an elastic sheet 2 to which a carrier sheet CS is attached, and then attach a first reinforcing part (reinforcing film) 6 to this (see Figure 3(a)). Note that Figure 3(a) is upside down compared to the state in use. [2] Next, a through hole CS1 is formed in the carrier sheet CS, an opening 21 is formed in the stretchable sheet 2, and a through hole 61 is formed in the first reinforcing part 6 (see FIG. 3(a)). This can be easily formed by, for example, punching with a punch, drilling with a drill, laser processing, or the like. [3] Next, a stretchable conductive layer 3 having a predetermined pattern is formed on the first reinforcing portion 6 and the upper surface of the stretchable sheet 2 (the lower surface when in use) (see FIG. 3(a)). This can be easily formed by using the stretchable conductive material, for example, by a printing method. Examples of printing methods include screen printing, droplet ejection (inkjet printing), gravure printing, roll coating printing, and knife coating printing.
[0031] [4] Next, the hook part 5 is fixed to the upper surface of the adhesive layer 72 of the second reinforcing part (reinforcing film) 7 (see FIG. 3(b)). [5] Next, the second reinforcing part 7 to which the hook part 5 is fixed is attached to the stretchable conductive layer 3 (see FIG. 3(c)). At this time, the hook part 5 is inserted through the through part 61 and the opening 21, and its upper end (tip) is positioned within the through part CS1. At this time, the flange part 52 of the hook part 5 is brought into contact with the stretchable conductive layer 3. The hook part 5 is fixed to the adhesive layer 72 of the second reinforcing part 7, and therefore can be suitably prevented from shifting position during the operation in this step [5]. [6] Next, if necessary, heat and pressure are applied to this adhesive body (laminate). As described above, since the stretchable conductive layer 3 is made of a stretchable conductive material, the elastomer is softened by heating and pressure, thereby improving the adhesion between the conductive filler and the hook portion 5. This improves the connection reliability between the stretchable conductive layer 3 and the hook portion 5.
[0032] [7] Next, the bioadhesive layer 4 is attached to the lower surface of the adhesive body (see FIG. 3(d)). It is preferable to leave a release film attached to the lower surface of the bioadhesive layer 4 until use, thereby improving the handleability of the bioadhesive layer 4 during production and the handleability of the stretchable wiring board 1 after production. Thereafter, punching is performed to form the outer shape of the stretchable wiring board 1, and then the carrier sheet CS is peeled off, thereby completing the stretchable wiring board 1.
[0033] The device main body 10 is attached to such a stretchable wiring board 1. The device body 10 has a magnetic hook portion (connection terminal) 101 on its underside. The magnetic hook portion 101 has a recess 101a in its center. A ring-shaped permanent magnet (e.g., a ferrite magnet or a neodymium magnet) 101b is housed inside the magnetic hook portion 101. Such a device main body 10 is attached to the stretchable wiring board 1 by connecting the magnetic hook portion (connection terminal) 101 to the hook portion (external terminal) 5. Specifically, by inserting the tip of the columnar portion 51 of the male hook portion 5 into the recess 101a of the female magnetic hook portion 101, they come into physical contact and an electrical connection can be ensured. In addition, the magnetic force of the permanent magnet 101b can ensure a mechanical connection between the magnetic hook portion 101 and the hook portion 5. Therefore, a high connection reliability can be obtained between the stretchable wiring board 1 and the device main body 10.
[0034] Furthermore, with this configuration, when the magnetic hook portion (connection terminal having magnetic force) 101 is brought close to the hook portion (external terminal) 5 from the top surface (one surface), the hook portion 5 is attracted to the magnetic hook portion 101, and the flange portion 52 presses against the stretchable conductive layer 3. This further improves the electrical connection between the hook portion 5 and the stretchable conductive layer 3. The device main body 10 is configured to supply current to the stretchable conductive layer 3 in a state where it is attached to the stretchable wiring board 1. In this embodiment, the connection terminal is configured with a magnetic hook part, but the connection terminal can also be configured with a spring hook part.
[0035] As shown in Fig. 1, two operation buttons 102 are provided on the surface of the device main body 10. These operation buttons 102 can change at least one of the amount of power supply or the supply pattern (mode). Note that changing the amount of power supply also includes turning the power supply (power supply) on and off. A power supply unit, a control unit, and an electric circuit unit (none of which are shown) are provided inside the device main body 10. The control unit is electrically connected to the power supply unit, the electric circuit unit, and two operation buttons 102, and two magnetic hook units 101 are electrically connected to the electric circuit unit. The power supply unit is configured to supply power to the stretchable conductive layer 3. For example, a dry cell, a solar cell, a fuel cell, a lithium ion secondary battery, an all-solid-state battery, a lithium polymer battery, etc. can be used as this power supply unit. The power supply unit may also be a connector to which a power cable can be connected.
[0036] The control unit includes a processing element and a storage element. The arithmetic element is configured by, for example, a CPU (Central Processing Unit), an MPU (Micro Processing Unit), etc. The arithmetic element realizes various functions related to the current supply device 100 by reading out predetermined programs stored in the memory element. In other words, information processing by the software stored in the memory element is specifically realized by the arithmetic element. The number of arithmetic elements is not limited to one, and a plurality of arithmetic elements may be provided for each function, or a combination thereof may be used.
[0037] The memory element stores various pieces of information defined above, and can be implemented 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 computing element, or as a memory such as a random access memory (RAM) that stores temporarily required information related to the program operations (arguments, arrays, etc.). The storage element also stores various programs, variables, etc. related to the current supply device 100 that are executed by the arithmetic element.
[0038] The electric circuit section 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, via the electric circuit unit, the power supplied from the power supply unit to the stretchable conductive layer 3. Here, controlling the power means setting at least one of the voltage value, current value, waveform, frequency, pulse width, current direction, and current flow time. In this embodiment, the current supplied by the device main body 10 under the control of the control unit can be a current for providing muscle stimulation, a current for heating the skin surface, or the like. The type (mode) of current supplied by the device main body 10 can be changed by operating the operation button 102.
[0039] Second Embodiment Next, a second embodiment of the current supply device of the present invention will be described. The current supply device 100 of the second embodiment will be described below, focusing on the differences from the current supply device 100 of the first embodiment, and a description of the same points will be omitted. The current supply device 100 of the second embodiment is similar to the current supply device 100 of the first embodiment, except that the configuration of the stretchable wiring board 1 is different. FIG. 4 is a cross-sectional view showing the stretchable wiring board according to the second embodiment. In the following description, the upper side in FIG. 4 will also be referred to as the "front" or "top", and the lower side will also be referred to as the "back" or "bottom".
[0040] The stretchable wiring board 1 of the second embodiment further includes a conductive connecting member 8 that is interposed between the flange portion 52 and the stretchable conductive layer 3 and electrically connects them. With this configuration, the mechanical connection and electrical connection between the hook portion 5 and the stretchable conductive layer 3 can be further improved. The conductive connecting member 8 may be a metal foil, but is preferably a conductive double-sided tape. The use of a conductive double-sided tape allows for a reliable connection between the hook portion 5 and the stretchable conductive layer 3 with a simple configuration. The conductive double-sided tape can be made of an adhesive tape in which conductive particles containing silver, gold, nickel, etc. are dispersed. In this case, the conductive connecting member 8 can be attached to a predetermined position on the stretchable conductive layer 3 prior to the step of FIG. 3(b). In the stretchable wiring board 1 of the first and second embodiments, the first reinforcing part (reinforcing film) 6 may be provided on the upper surface side of the stretchable sheet 2. Also, the second reinforcing part (reinforcing film) 7 may be configured only by the film substrate 71, omitting the pressure-sensitive adhesive layer 72. In this case, in the manufacturing process of the stretchable wiring board 1, when the adhesive body (laminate) is heated and pressurized, the first reinforcing part (reinforcing film) 6 and the film substrate 71 may be joined by fusion bonding, for example.
[0041] <Third embodiment> Next, a third embodiment of the current supply device of the present invention will be described. The current supply device 100' of the third embodiment will be described below, focusing on the differences from the current supply devices 100 of the first and second embodiments, and a description of the same points will be omitted. The current supply device 100' of the third embodiment is similar to the current supply devices 100 of the first and second embodiments, except that the configuration of the attachment portion between the stretchable wiring board 1 and the device main body 10 is different. 5A and 5B are views showing an exploded state of a current supply device according to a third embodiment ((a) is a plan view of a stretchable wiring board, and (b) is a bottom view of the device body). FIG. 6 is a cross-sectional view taken along line BB in FIG. 5. In the following description, the front side of the page in Fig. 5(a) will also be referred to as the "front" or "top," and the back side of the page will also be referred to as the "back" or "bottom." The back side of the page in Fig. 5(b) will also be referred to as the "front" or "top," and the front side of the page will also be referred to as the "back" or "bottom." Furthermore, the top side of Fig. 6 will also be referred to as the "front" or "top," and the bottom side will also be referred to as the "back" or "bottom."
[0042] As shown in FIG. 5(b), the device main body 10' is provided with a columnar portion 101' as a connection terminal. As shown in Figures 5(a) and 6, the stretchable wiring board 1' has a columnar magnet portion 5' that includes a magnetized hard magnetic body and serves as an external terminal. The first reinforcing portion 6' is a block-shaped reinforcing block. The first reinforcing portion (reinforcing block) 6' has a through portion 61' that penetrates in the thickness direction and exposes the magnet portion (external terminal) 5'. A recess is formed by the through portion 61' and the magnet portion 5', and the columnar portion 101' is configured to be inserted into this recess. On the other hand, the second reinforcing portion 7' is also a film-shaped reinforcing film. This second reinforcing portion (reinforcing film) 7' includes a film substrate 71' and a conductive adhesive layer 72' that is supported by the film substrate 71' and in contact with the magnet portion (external terminal) 5'. The film substrate 71' can have the same configuration as the film substrate 71. The adhesive layer 72' can be formed by dispersing conductive particles (conductive filler) in the adhesive layer 72.
[0043] In this embodiment, the magnet portion (external terminal) 5' is electrically connected to the stretchable conductive layer 3 via the adhesive layer 72'. The first reinforcing portion (reinforcing block) 6′ is bonded to the second reinforcing member (reinforcing film) 7′ via a non-conductive adhesive layer 9. The adhesive layer 9 can have the same configuration as the adhesive layer 72. The current supply device 100' of the third embodiment also provides the same functions and effects as the current supply devices 100 of the first and second embodiments.
[0044] In this embodiment, the stretchable wiring board 1' is provided with a magnet section 5' as an external terminal, and therefore the columnar section 101', which is the connection terminal of the device main body 10', may or may not have magnetism. Also, when the columnar section 101' is configured to have magnetism, the external terminal of the stretchable wiring board 1' may be configured from a soft magnetic material that does not have magnetism. 6, it may be located above the stretchable sheet 2, or at any position within the thickness range of the stretchable sheet 2 and the stretchable conductive layer 3. In either 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. The current supply device 100' of the fourth embodiment will be described below, focusing on the differences from the current supply device 100' of the third embodiment, and a description of the same points will be omitted. The current supply device 100' of the fourth embodiment is similar to the current supply device 100' of the third embodiment, except that the configuration of the stretchable wiring board 1' is different. FIG. 7 is a cross-sectional view showing a stretchable wiring board according to a fourth embodiment. In the following description, the upper side in FIG. 7 will also be referred to as the "front" or "top", and the lower side will also be referred to as the "back" or "bottom".
[0046] A larger portion of the lower side of the first reinforcing portion (reinforcing block) 6' of the fourth embodiment is located within the opening 21 of the stretchable sheet 2 than the first reinforcing portion (reinforcing block) 6' of the third embodiment. This makes it possible to reduce the thickness of the 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 also in contact with the stretchable conductive layer 3 at a location not shown. In this configuration, the magnet section 5' is electrically connected to the stretchable conductive layer 3 via the adhesive layer 72'.
[0047] In addition, in this embodiment, since the adhesive layer 72' is conductive, a large space 11' is formed in the center of the stretchable wiring board 1', preventing the left and right adhesive layers 72' from coming into contact and becoming conductive. In this configuration, the adhesive layer 9 may be omitted and the conductive adhesive layer 72' may be bonded to the first reinforcing portion 6', and in this case the configuration in which the left and right adhesive layers are separated is maintained. Furthermore, it may be provided in the following aspects.
[0048] (1) A stretchable wiring board comprising a stretchable sheet, a stretchable conductive layer, an external terminal, a first reinforcing part, and a second reinforcing part, wherein the stretchable sheet has an opening penetrating through it in the thickness direction, the stretchable conductive layer is supported by the stretchable sheet, the external terminal is electrically connected to the stretchable conductive layer and is inserted into the opening, at least a portion of the first reinforcing part is arranged on one side of the stretchable conductive layer, and at least a portion of the second reinforcing part is arranged on the other side of the stretchable conductive layer, and the external terminal is held therebetween and the stretchable wiring board is configured to reinforce at least the periphery of the external terminal of the stretchable conductive layer.
[0049] (2) The stretchable wiring board according to (1) above, wherein the first reinforcing portion is a film-like reinforcing film.
[0050] (3) The stretchable wiring board according to (2) above, wherein at least a portion of the reinforcing film is located between the stretchable sheet and the stretchable conductive layer.
[0051] (4) In the stretchable wiring board described in (2) or (3) above, the external terminal has a columnar portion inserted into the opening and a flange portion protruding laterally from the columnar portion, and the reinforcing film has a through portion penetrating through the thickness direction thereof, and overlaps at least a part of the flange portion when the columnar portion is inserted through the through portion. A stretchable wiring board.
[0052] (5) The stretchable wiring board according to (4) above, wherein a portion of the stretchable conductive layer is located between the flange portion and the stretchable sheet.
[0053] (6) In the stretchable wiring board according to (5) above, the stretchable conductive layer is electrically connected to the external terminal by directly contacting the flange portion.
[0054] (7) The stretchable wiring board according to (5) or (6) above, further comprising a conductive connecting member interposed between the flange portion and the stretchable conductive layer to electrically connect them.
[0055] (8) In the stretchable wiring board according to any one of (5) to (7) above, the external terminal comprises a soft magnetic material or a magnetized hard magnetic material, and when a connection terminal having magnetic force is brought close to the external terminal from the one surface side, the external terminal is attracted to the connection terminal, and the flange portion presses the stretchable conductive layer. A stretchable wiring board.
[0056] (9) In the stretchable wiring board described in (1) above, the external terminal includes a soft magnetic material or a magnetized hard magnetic material, the first reinforcing part is a block-shaped reinforcing block, and the reinforcing block has a through part that penetrates in its thickness direction and exposes the external terminal. A stretchable wiring board.
[0057] (10) In the stretchable wiring board described in (9) above, the second reinforcing portion is a film-shaped reinforcing film, and the reinforcing film comprises a film substrate and a conductive adhesive layer supported by the film substrate and in contact with the external terminal. A stretchable wiring board.
[0058] (11) In the stretchable wiring board according to (10) above, the external terminals are electrically connected to the stretchable conductive layer via the pressure-sensitive adhesive layer.
[0059] (12) In the stretchable wiring board according to any one of (1) to (11) above, the second reinforcing portion is a film-shaped reinforcing film, and the reinforcing film comprises a film base material and a pressure-sensitive adhesive layer supported by the film base material and in contact with the external terminal.
[0060] (13) The stretchable wiring board according to any one of (1) to (12) above, wherein the external terminal is configured as a single component.
[0061] (14) The stretchable wiring board according to any one of (1) to (13) above, further comprising a bioadhesive layer provided on the other surface side and attached to the skin surface of a user.
[0062] (15) The stretchable wiring board according to (14) above, wherein the bioadhesive layer is in a gel state.
[0063] (16) A device for supplying electric current to a living organism, comprising: the stretchable wiring board according to any one of (1) to (15) above; and a device main body, wherein the stretchable wiring board is configured to use the stretchable conductive layer as the skin side of a user; and the device main body has a connection terminal, and is attached to the stretchable wiring board by connecting the connection terminal to the external terminal, and is configured to supply electric current to the stretchable conductive layer. Of course, this is not the case.
[0064] As described above, various embodiments of the present invention have been described, but these are presented as examples and do not limit the scope of the invention in any way. The novel embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. Such embodiments and their modifications are intended to be included within the scope and spirit of the invention, as well as within the scope of the inventions and their equivalents as set forth in the claims. [Explanation of symbols]
[0065] 100: Current supply device 100': Current supply device 1:Stretchable wiring board 1': Stretchable wiring board 11': large space 2: Elastic sheet 21: Opening 3:Stretchable conductive layer 4: Bioadhesive layer 5: Hook part 51: Columnar part 52: Tsuba section 5': Magnet section 6: First reinforcement part 61: Penetration 6': First reinforcement part 61': Penetration 7: Second reinforcement part 71: Film substrate 72: Adhesive layer 7': Second reinforcement 71': Film substrate 72': Adhesive layer 8: Conductive connecting member 9: Adhesive layer 10: Device body 10': Device body 101: Magnetic hook part 101': Columnar part 101a: recess 101b: Permanent magnet 102: Operation button CS: Career Sheet CS1: Penetration
Claims
1. A stretchable wiring substrate, The device includes a stretchable sheet, a stretchable conductive layer, an external terminal, and a reinforcing portion, the stretchable sheet has a first opening penetrating through it in its thickness direction, the stretchable conductive layer is supported by the stretchable sheet and has a second opening penetrating through the layer in its thickness direction; the external terminal is electrically connected to the elastic conductive layer and is inserted through the first opening and the second opening; The reinforcing portion is joined to the surface of the stretchable conductive layer opposite the stretchable sheet, and is configured to hold the external terminal and reinforce at least the periphery of the external terminal of the stretchable conductive layer.
2. The stretchable wiring board according to claim 1, The stretchable wiring board further comprises a conductive connecting member that electrically connects the stretchable conductive layer and the external terminal.
3. The stretchable wiring board according to claim 2, the reinforcing portion is a reinforcing film having a film shape, The reinforcing film is configured to reinforce at least the connection portion between the conductive connecting member and the stretchable conductive layer.
4. The stretchable wiring board according to claim 1, The external terminal has a columnar portion inserted into the first opening and the second opening, and a flange portion protruding laterally from the columnar portion.
5. The stretchable wiring board according to claim 4, A stretchable wiring board, wherein a portion of the stretchable conductive layer is located between the flange portion and the stretchable sheet.
6. The stretchable wiring board according to claim 4, The stretchable conductive layer is in direct contact with the flange portion, thereby being electrically connected to the external terminal.
7. The stretchable wiring board according to claim 4, The stretchable wiring board further comprises a conductive connecting member that electrically connects the flange portion and the stretchable conductive layer.
8. The stretchable wiring board according to claim 5, the external terminals include a soft magnetic material or a magnetized hard magnetic material, When a connecting terminal having magnetic force is brought close to the external terminal from the side of the stretchable sheet opposite the stretchable conductive layer, the external terminal is attracted to the connecting terminal, and the flange portion presses against the stretchable conductive layer.
9. The stretchable wiring board according to claim 4, the reinforcing portion is a reinforcing film having a film shape, The flange portion is located between the reinforcing film and the stretchable conductive layer.
10. The stretchable wiring board according to claim 1, the reinforcing portion is a reinforcing film having a film shape, The reinforcing film is a stretchable wiring board comprising a film substrate and a conductive adhesive layer supported by the film substrate and in contact with the external terminals.
11. The stretchable wiring board according to claim 10, The external terminals are electrically connected to the stretchable conductive layer via the pressure-sensitive adhesive layer.
12. The stretchable wiring board according to claim 1, the reinforcing portion is a reinforcing film having a film shape, The reinforcing film is a stretchable wiring board comprising a film substrate and a pressure-sensitive adhesive layer supported by the film substrate and in contact with the external terminals.
13. The stretchable wiring board according to claim 1, The external terminal is a stretchable wiring board configured as a single component.
14. The stretchable wiring board according to claim 1, The stretchable wiring board further comprises a bioadhesive layer provided on the surface of the stretchable conductive layer opposite the stretchable sheet, the bioadhesive layer being attached to the skin surface of a user.
15. The stretchable wiring board according to claim 14, The stretchable wiring substrate, wherein the bioadhesive layer is in a gel state.
16. A device for supplying electric current to a living body, The stretchable wiring board according to any one of claims 1 to 15 and a device main body are provided, The stretchable wiring board is configured to use the stretchable conductive layer as a skin-facing side of a user, The device main body has a connection terminal, and is attached to the stretchable wiring board by connecting the connection terminal to the external terminal, and is configured to supply current to the stretchable conductive layer.