JP6676373B2 - Stretchable wiring board and method of manufacturing stretchable wiring board - Google Patents

Description

  The present invention relates to a stretchable wiring substrate including a stretchable base material and a stretchable wiring portion, and a method for manufacturing the same.

  In recent years, interest in biological sensors and biological information monitors has increased in the wearable device and medical device markets. For example, in the sports industry, attempts have been made to quantify body movements with high precision in order to further improve the physical abilities and skills of competitors. In such a case, a wearable living body sensor that detects the movement of the living body may be applied. In the medical industry, attempts are being made to detect vital signs (biological information) such as an electrocardiogram, heart rate, blood pressure, and body temperature in order to treat a disease or take measures against a non-diseased disease. An information monitor may be applied. A biological sensor and a biological information monitor are generally provided on clothes and equipment, and sensing and monitoring are performed by wearing these clothes and equipment.

  However, the movement of the human body causes the clothes and equipment to slightly deviate from the body, and the biological sensors and biological information monitors provided on the clothes and equipment deviate from the target part of the living body, resulting in a significant decrease in sensing accuracy and monitoring accuracy. There is.

The above problem is suppressed by directly attaching the biological sensor or the biological information monitor to a human body. Therefore, in recent years, a technique called stretchable electronics having a base material having stretchability in the in-plane direction and wiring has been studied, and a wiring board which can stretch and follow movements of human joints has been proposed. I have. When a biosensor or a biometric information monitor is used for medical purposes, at least a portion of the biosensor that is in contact with or near a living body should be disposable from the viewpoint of preventing infectious diseases. Is desired.

  As a stretchable wiring board of this type, Patent Literature 1 describes a circuit board including a stretchable base material and a conductive pattern including conductive fine particles and an elastomer, and the entire board has stretchability. Patent Document 2 describes a stretchable wiring board in which an island made of a material having a higher Young's modulus than a stretchable base material is formed into a thin film by a printing method and embedded in the base material. Elements are mounted on the islands, and the islands are connected by elastic wiring. It is stated that, when the stretchable base material expands and contracts, breakage of the element and disconnection of the wiring straddling the boundary between the island and the base material can be prevented.

JP 2014-236103 A JP 2014-162124 A

  When implementing a biological sensor or a biological information monitor, external devices such as a power supply and a control board that have a large mass and high rigidity should not be mounted on the elastic wiring board so that the movement of the target part of the living body is not hindered. It is preferable to connect. For this reason, the stretchable wiring board is required not only to have high reliability in electrical characteristics, but also to have stretchability for following the movement of the human body and to be easy to handle when connected to an external device, for example. I have. On the other hand, in the stretchable wiring boards of Patent Literature 1 and Patent Literature 2, handling properties are not examined at all.

  The present invention has been made in view of the above-described problems, and provides a stretchable wiring board having excellent stretchability and handleability while ensuring high reliability of electrical characteristics, and a method of manufacturing the same.

According to the present invention, an elastic substrate integrally formed of an elastic material, an elastic wiring portion formed on at least one main surface of the elastic substrate and having elasticity, A reinforcing base having higher in-plane rigidity than the base, and a lead-out wiring portion formed on at least one main surface of the reinforcing base, wherein the main surface of the reinforcing base is the elastic wiring The main surface of the stretchable base material is overlapped facing a part of the formation region of the portion, and the stretchable wiring portion and a part of the lead-out wiring portion are joined to each other and are electrically connected to each other ; A terminal portion connected to the lead-out wiring portion is formed on the main surface of the reinforcing base material, and the stretchable base material covers at least a part of the lead-out wiring portion and is close to the terminal portion. Or, extend in a series with the stretchable material to a position covering a part of the terminal portion. Elastic wiring board, wherein provided that they are.

Further, according to the present invention, a step of forming a stretchable wiring portion having stretchability on at least one main surface of a stretchable base material integrally formed of a stretchable material, A step of forming a lead-out wiring portion on at least one main surface of the reinforcing base material having high in-plane rigidity; a step of forming a terminal portion on the main surface of the reinforcing base material; and the main surface of the reinforcing base material. A part of the stretchable wiring portion forming region, the stretchable base material and the main surface thereof are overlapped facing each other, and the stretchable wiring portion and a part of the lead-out wiring portion are joined to each other. see containing and a bonding step for conducting one another, in the joining step, the stretchable substrate being formed a series Nari on by the elastic material, while covering at least a portion of the lead wire sections, wherein the terminal portion Of the terminal portion or a position covering a part of the terminal portion. The stretchable substrate and the reinforcing substrate is positioned, the manufacturing method of the stretchable wiring substrate is provided.

  In the stretchable wiring board of the present invention, a reinforcing base material having a higher in-plane rigidity than the stretchable base material is superposed on a part of the formation region of the stretchable wiring portion, and the reinforcing base material is formed on the stretchable wiring board. It is excellent in handling because it gives stiffness. On the other hand, in other areas where the reinforcing base material is not provided, elasticity required for a biological sensor or a biological information monitor can be realized. Then, a stretchable wiring portion and a lead-out wiring portion formed on different base materials, that is, a stretchable base material and a reinforcing base material, are overlapped face to face and partially joined to each other. For this reason, it is possible to stably form each wiring portion on a flat base material by an appropriate method according to the properties of the base material, and the stretchable wiring board of the present invention is excellent in reliability of electric characteristics. Structure. According to the manufacturing method of the present invention, the above-mentioned stretchable wiring board can be obtained.

It is a top view showing the elastic wiring board concerning a first embodiment of the present invention. It is XX sectional drawing of FIG. FIG. 3A is a plan view of a stretchable base material, and FIG. 3B is a cross-sectional view taken along line YY. FIG. 4A is a plan view of the reinforcing base material, and FIG. 4B is a cross-sectional view taken along the line ZZ. It is a top view which shows a protective layer. It is a schematic diagram which shows the manufacturing process of an elastic wiring board. FIG. 7A is an enlarged view showing a state in which the stretchable wiring part and the lead-out wiring part are joined, and FIG. 7B is an enlarged view showing the joint part. It is a top view showing the elastic wiring board concerning a second embodiment of the present invention. FIG. 9 is a sectional view taken along line WW of FIG. 8. FIG. 10A is a plan view of the stretchable base material b on which the connection stretchable wiring portions are formed, as viewed from the upper surface side (upper side in FIG. 9), and FIG. FIG. 10 is a plan view of the stretchable base material viewed from the upper surface side (upper side in FIG. 9) in a state where the stretchable base material shown in FIG. It is a schematic diagram which shows the manufacturing process of an elastic wiring board. It is a top view showing an elastic wiring board concerning a modification of a second embodiment of the present invention. FIG. 13 is a sectional view taken along line VV of FIG. 12. FIG. 8 is a cross-sectional view taken along line WW, assuming that FIG. 8 shows a plan view of a stretchable wiring board according to a second modification of the second embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each of the drawings, corresponding components are denoted by common reference numerals, and redundant description will be omitted as appropriate.
It should be noted that the “surface” in this specification does not need to be a geometrically perfect plane, but allows the formation of a concave portion or a convex portion. In addition, the term “film” as used in the present specification broadly includes a generally thin shape such as a sheet or a film. That is, the thickness of each sheet is not specified by the difference in the name of a sheet, a film, a film, or the like.

[First embodiment]
FIG. 1 is a plan view showing an elastic wiring board 100 according to the first embodiment of the present invention, and FIG. 2 is a sectional view taken along line XX of FIG. First, an outline of the first embodiment will be described. For convenience, in the following description, the lower side of FIG. 2 may be referred to as a lower side, and the upper side of FIG. 2 and the near side of FIG. 1 may be referred to as an upper side. However, this is defined for the sake of convenience in order to explain the relative positional relationship of the components, and does not always coincide with the vertical direction of gravity.

The stretchable wiring board 100 includes a stretchable base 10, a stretchable wiring section 20, a reinforcing base 50 having higher in-plane rigidity than the stretchable base 10, and a lead-out wiring section 54. The elastic wiring portion 20 is formed on the main surface 11 on at least one side of the elastic substrate 10 and has elasticity. The lead wiring portion 54 is formed on at least one main surface 51 of the reinforcing base material 50.
The main surface 51 of the reinforcing base material 50 is overlapped with a part of the formation region of the elastic wiring portion 20 so as to face the main surface 11 of the elastic base material 10. Then, a part of the elastic wiring part 20 and a part of the lead-out wiring part 54 are joined to each other and are electrically connected to each other.

  Here, the fact that a part of the stretchable wiring part 20 and a part of the lead wiring part 54 are joined to each other means that a part of the length area in the stretchable wiring part 20 and a part of the length area in the lead wiring part 54 are combined. Means that they are directly contacted and integrated without interposing an adhesive or a pressure-sensitive adhesive. The stretchable wiring board 100 of the first embodiment is characterized in that the stretchable wiring section 20 and the lead-out wiring section 54 are directly joined, and the other layers (for example, the stretchable base material 10 and For bonding of the reinforcing substrate 50), an adhesive or a pressure-sensitive adhesive may be optionally used.

Next, the stretchable wiring board 100 of the first embodiment will be described in detail.
The stretchable wiring board 100 has at least one terminal section 30 and is used by being connected to various external devices. Examples of the external device include, in addition to a power supply and a control board, a detection unit that detects the operation of a living body and biological information such as an electrocardiogram, heart rate, blood pressure, and body temperature. Thus, the stretchable wiring board 100 can be used as a part of a biological sensor or a biological information monitor. The above-described detection unit may be mounted on the stretchable wiring board 100, and various electronic elements such as a resistor and a capacitor may be mounted on the stretchable wiring board 100. The stretchable wiring board 100 can be used by attaching it to the surface of a human body, or can be used by attaching it to a robot, various devices, devices, or wearables.

  The stretchable wiring board 100 includes a reinforcement region 40 and a stretch region 42 having lower in-plane rigidity and stretchability than the reinforcement region 40. The reinforcing region 40 and the stretchable region 42 are partial regions of the stretchable wiring board 100 when viewed in plan, and do not overlap with each other. The reinforcing region 40 is a region where the reinforcing substrate 50 is provided, and the elastic region 42 is a region where the reinforcing substrate 50 is not provided. The stretchable region 42 forms a main area of the main surface of the stretchable wiring board 100 and has a larger area than the reinforcing region 40. The stretchable stretchable base material 10 is provided over the reinforcement region 40 and the stretchable region 42. Then, a joint portion 56 between the elastic wiring portion 20 and the lead-out wiring portion 54 is formed in the reinforcing region 40.

The elastic region 42 has the flexibility of deforming in the direction perpendicular to the plane when an external force is applied in the direction perpendicular to the plane (vertical direction in FIG. 2), and in the in-plane direction (up / down / left / right directions in FIG. 1). It has elasticity that extends in the in-plane direction when an external force is applied.
The reinforcement region 40 has lower in-plane elasticity than the elastic region 42. The reinforcement region 40 of the first embodiment has the flexibility to deform in the direction perpendicular to the plane when an external force is applied in the direction perpendicular to the plane, and does not substantially extend in the in-plane direction. The reinforcement region 40 is a portion having appropriate rigidity (stiffness) like a flexible printed wiring board or a flexible flat cable, and is used by being connected to an external device (not shown) such as a controller or an external board. The reinforcement region 40 has a role of relaying the electrode unit 26 formed in the stretchable region 42 of the stretchable wiring board 100 and an external device.
As shown in FIGS. 1 and 2, in the first embodiment, only one reinforcing region 40 is provided on the left side of the stretchable wiring board 100, but the present invention is not limited to this. It may be.

  In the stretchable wiring board 100, the extension wiring portion 54 formed on the main surface 51 of the reinforcing base material 50 and the stretchable wiring portion 20 formed on the main surface 11 of the stretchable base material 10 are formed in the same layer. Have been. In addition, at the joining portion 56 located at the boundary region between the reinforcing region 40 and the stretchable region 42, the ends of the lead-out wiring portion 54 and the stretchable wiring portion 20 are joined to each other and are electrically connected to each other. More specifically, at least one of the end portion of the lead-out wiring portion 54 and the end portion of the stretchable wiring portion 20 has a fusibility, and is directly adhered to the other by heating and / or pressing. . As will be described later, both the lead-out wiring part 54 and the elastic wiring part 20 include an elastomer material as a resin binder, and when heated and / or pressurized, the lead wiring part 54 and the elastic wiring part 20 are fused and fused together. It is preferred that

  FIG. 3A is a plan view of the stretchable base material 10 as viewed from the top side (upper side in FIG. 2), and FIG. 3B is a cross-sectional view taken along line YY. The stretchable substrate 10 is a sheet-like member that can expand and contract in at least one of the in-plane directions. Desirably, the stretchable base material 10 can expand and contract in two directions in the in-plane direction. The stretchability of the stretchable base material 10 in the in-plane direction may be isotropic, or the stretchability in the in-plane stretch directions may be different from each other.

  The stretchable wiring portion 20 is a stretchable conductive pattern formed on one or both sides of the stretchable base material 10. The elastic wiring portion 20 of the first embodiment is formed on one surface (the main surface 11) of the elastic substrate 10. The pattern shape of the elastic wiring portion 20 is not particularly limited. In the first embodiment illustrated in FIG. 3A, an example in which a plurality of linear stretchable wiring portions 20 are printed on the main surface 11 is illustrated. Each elastic wiring portion 20 has a wiring end portion 28 forming a joint portion 56 (see FIGS. 1 and 2) and a first electrode 26a or a second electrode 26b forming an electrode portion 26 at both ends. Is formed.

The wiring end portion 28 is a portion that is joined to a wiring end portion 58 (see FIG. 4A) of the lead-out wiring portion 54, which will be described later, to form a joint portion 56 (see FIGS. 1 and 2). It is a portion formed wider than the portion 20. In the first embodiment, the form in which the elastic wiring portion 20 is terminated at the wiring end portion 28 is exemplified, but the position and shape of the wiring end portion 28 are not limited to this, A wiring end 28 may be provided.
The wiring end part 28 and the electrode part 26 may have elasticity like the elastic wiring part 20, or may have higher in-plane rigidity than the elastic wiring part 20 and have substantially no elasticity. You may. However, as described later, it is preferable that the wiring end portion 28 and the electrode portion 26 are formed by printing using the same conductive material as the elastic wiring portion 20 in the same process as the elastic wiring portion 20.

  The first embodiment exemplifies a mode in which a first electrode 26a and a second electrode 26b are arranged adjacent to each other to form a pair of electrode portions 26 (electrode pairs). By measuring the capacitance between the first electrode 26a and the second electrode 26b, the stretchable wiring board 100 detects that a conductor such as a human finger has approached the electrode portion 26, and that capacitive coupling has occurred. Function as a capacitance-type proximity sensor that detects Alternatively, by measuring the electric resistance between the first electrode 26a and the second electrode 26b, the stretchable wiring board 100 can extend over the first electrode 26a and the second electrode 26b, and It functions as a touch sensor that detects that a contact has occurred. However, the present invention is not limited to this. A plurality of electrode units 26 may be individually arranged discretely. The electrode section 26 may be used as a sensor electrode for measuring a weak voltage such as a myoelectric potential. FIG. 3A illustrates the stretchable base material 10 including three pairs of electrode portions 26, but the number of the electrode portions 26 is arbitrary. Alternatively, only the elastic wiring portion 20 may be formed on the elastic substrate 10 without providing the electrode portion 26. In this case, the stretchable wiring board 100 can be used as a wiring board for transmitting an electric signal.

  The electrode part 26 is formed in the expansion / contraction area 42, and the wiring end part 28 is formed in the reinforcement area 40. The elastic wiring section 20 is formed over the elastic area 42 and the reinforcing area 40.

The stretchable base material 10 has stretchability extending in an in-plane direction by an external force, and is formed of a single layer or a laminate of a plurality of stretchable layers.
Preferred materials for forming the stretchable substrate 10 include, but are not limited to, elastomer materials such as nitrile rubber, latex rubber, urethane-based elastomer, and silicone-based elastomer. Particularly, by using a urethane-based elastomer sheet used for medical purposes, high safety can be obtained even when the sheet is attached to the skin of a human body.

  The thickness of the stretchable base material 10 is not particularly limited, but is preferably, for example, 100 μm or less from the viewpoint of not hindering the movement of expansion and contraction of an object (target surface) to which the stretchable wiring substrate 100 is applied. . The thickness of the stretchable substrate 10 is more preferably 25 μm or less, and still more preferably 10 μm or less.

The stretchable base material 10 preferably has a maximum elongation of 10% or more, more preferably 50% or more, further preferably 100% or more, and particularly preferably 200% or more. . The stretchable substrate 10 made of the above-described material can exhibit, for example, a maximum elongation of 300% or more. Here, the maximum elongation percentage of the stretchable base material 10 refers to the maximum value of the elongation percentage at which elastic deformation is possible in one direction in the in-plane direction.
In addition, in this specification, the elongation means the ratio of the dimension in the in-plane direction due to the application of a force to the dimension when no external force is applied (dimension of 0% elongation). For example, if the elongation is 50%, the elongation is 1.5 times the dimension of the 0% elongation, and if the elongation is 100%, the elongation is twice the dimension of the 0% elongation.

  The elastic wiring portion 20 is configured to include a conductive material and has conductivity. As the conductive material, a material having good conductivity such as silver, gold, platinum, carbon, copper, aluminum, cobalt or nickel, or an alloy thereof can be selected. The shape of the conductive material is not particularly limited, but may be in the form of particles such as granules or powder. The particle shape is not particularly limited, and may be spherical, needle-like, flake-like, nanowire-like, or the like. The aspect ratio of the particles can be, for example, from 1 to 100, in particular, from 1 to 50. Here, the aspect ratio means the ratio between the longest dimension and the shortest dimension of the three-dimensional body. By setting the aspect ratio of the particles constituting the elastic wiring portion 20 to 5 or more and 20 or less, the resistance when the elastic wiring substrate 100 extends in the in-plane direction and the elastic wiring portion 20 is deformed in the length direction. The change can be suppressed low.

  It is preferable that the elastic wiring portion 20 further includes a resin binder. That is, the elastic wiring portion 20 of the first embodiment is formed of a conductive material in which conductive particles are dispersed and mixed in a resin material. Since the elastic wiring portion 20 includes the resin binder, the elastic wiring portion 20 is prevented from being broken by the expansion and contraction of the elastic base material 10. Examples of the resin binder include, but are not limited to, a thermoplastic elastomer material such as a urethane resin binder and silicone rubber. As the resin binder, a resin binder having a low Young's modulus such that the elastic modulus of the elastic wiring portion 20 in a coated state is equal to or smaller than the elastic modulus of the elastic substrate 10 is selected. It is desirable. One kind of elastomer material may be used, or a mixture of plural kinds of elastomer materials may be used.

  By using a thermoplastic resin for the resin binder of the stretchable wiring section 20, when joining the stretchable wiring section 20 and the lead-out wiring section 54, the wires are connected by utilizing the fusion bonding property of the stretchable wiring section 20. It can be connected mechanically and electrically. Accordingly, there is no need to use a joining member such as an anisotropic conductive film (ACF) for joining the stretchable wiring section 20 and the lead-out wiring section 54, and such a joining step can be easily performed.

The method for forming the stretchable wiring portion 20 is not particularly limited, but can be formed by, for example, a printing method. That is, the stretchable wiring portion 20 of the first embodiment is a print pattern formed by printing and applying a conductive paste having stretchability.
The specific printing method is not particularly limited, and examples thereof include a screen printing method, an inkjet printing method, a gravure printing method, and an offset printing method. Among these, screen printing is preferably used from the viewpoint of fine resolution and thick film stability.
When the elastic wiring portion 20 is formed by a printing method, it is preferable to prepare a conductive paste containing the above-described conductive particles, a resin binder, and an organic solvent, and to provide the conductive paste to the printing method. By using a stretchable conductive paste containing metal particles such as silver as a main component for the stretchable wiring portion 20, for example, an elongation of about 50% or more and about 70% or less can be realized, and the stretchability is excellent. It is possible to form an interconnect that has been formed.
Then, the wiring end portions 28 and the electrode portions 26 (the first electrode 26a and the second electrode 26b) may be formed by printing using the same conductive paste as the elastic wiring portion 20 in the same process as the elastic wiring portion 20. Thus, excellent elongation characteristics can be obtained also in the electrode portion 26, and the stretchable wiring board 100 can be obtained with a small number of steps.

  The thickness and width of the stretchable wiring portion 20 are determined by the resistivity of the stretchable wiring portion 20 when no load is applied and the resistance change when the stretchable base material 10 is stretched, and the overall thickness size of the stretchable wiring substrate 100. And the width dimension can be determined. From the viewpoint of ensuring good stretchability by following the dimensional change of the stretchable base material 10 during stretching, the width dimension of the stretchable wiring portion 20 is preferably 1000 μm or less, and preferably 500 μm or less. Is more preferable, and it is further preferable that it is 200 micrometers or less. The thickness dimension of each wiring constituting the elastic wiring portion 20 can be 25 μm or less. Desirably, it is 10 μm or more and 15 μm or less.

4A is a plan view (bottom view) of the reinforcing base material 50 as viewed from the lower surface side (the lower side in FIG. 2), and FIG. 4B is a sectional view taken along the line ZZ.
The reinforcing substrate 50 is a member having higher in-plane rigidity than the elastic substrate 10 and constituting the reinforcing region 40 of the elastic wiring substrate 100. A lead wiring portion 54 is formed on the main surface 51 on the lower surface side of the reinforcing base material 50.

  The reinforcing substrate 50 has a film substrate 60 having higher in-plane rigidity than the elastic substrate 10. The reinforcing base material 50 may be formed of a single layer of the film base material 60, or may be formed by stacking the film base material 60 and another layer (such as an easy-adhesion layer 64 described later).

  The film substrate 60 has a larger Young's modulus than the elastic substrate 10. The material of the film substrate 60 is not particularly limited, but has low sliding property, corrosion resistance and high strength, such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyimide (PI), polyphenylene sulfide (PPS), and fluororesin. Can be used. In addition, a paper material having appropriate durability, such as cellulose nanofiber paper, may be used for the film substrate 60.

  When a urethane-based elastomer sheet is used as the stretchable base material 10, it exhibits heat-sealing properties by heating, so that it can be laminated by laminating the film base material 60 as an adherend by heating and pressing. By directly joining the elastic substrate 10 and the film substrate 60, a joining member such as an ACF can be omitted, and the joining process can be simplified. Further, since the elastic substrate 10 and the film substrate 60 do not adhere to each other unless heating and pressing are performed, there is an advantage that workability is extremely high even when performing high-accuracy alignment. Note that in this specification, two layers are directly joined to each other means that the two layers are directly contacted and integrated by a joining method such as heat press (heat press bonding). .

  However, instead of the first embodiment, the elastic substrate 10 and the reinforcing substrate 50 may be joined using an adhesive or a pressure-sensitive adhesive. In this case, the non-forming region of the wiring end portion 58 of the lead-out wiring portion 54 in the reinforcing base material 50 and the non-forming region of the wiring end portion 28 of the elastic wiring portion 20 in the elastic base material 10 are bonded with an adhesive or an adhesive. It is good to join using an agent.

  The thickness of the film substrate 60 can be 10 μm or more and 200 μm or less, preferably 25 μm or more and 150 μm or less, and more preferably 50 μm or more and 100 μm or less. Further, it is preferable that the thickness of the film substrate 60 be larger than the thickness of the elastic substrate 10. By setting the thickness of the film substrate 60 within the above range, the in-plane rigidity of the reinforcing region 40 can be sufficiently increased, and the overall thickness of the stretchable wiring board 100 can be suppressed.

  The lead-out wiring part 54 formed on the main surface 51 of the reinforcing base material 50 may or may not have elasticity. The lead wiring portion 54 can be formed by various methods, and for example, an etching method or a printing method can be used. In the case of using the etching method, the surface (main surface 51) of the film substrate 60 is covered with a metal thin film, or a foil material previously formed in a sheet shape is bonded to an underlayer, and then the thin film or the foil material is formed. Can be formed by etching into a desired pattern shape of the extraction wiring portion 54. Examples of the metal thin film or foil material include copper, nickel, silver, and aluminum.

  When the lead-out wiring part 54 is formed by etching a metal thin film or a foil material, the lead-out wiring part 54 has substantially no fusibility. For this reason, in the joint portion 56, the ends of the lead-out wiring portion 54 and the end portions of the elastic wiring portion 20 are joined together by the fusion property of the elastic wiring portion 20 containing the elastomer material as the resin binder.

  When the extraction wiring portion 54 is formed by a printing method, a desired conductive paste is applied to the surface (the main surface 51) of the film substrate 60 by a method such as a screen printing method, an inkjet printing method, a gravure printing method, and an offset printing method. The lead wiring portion 54 can be formed by applying the wiring in a pattern shape. In this case, the lead-out wiring part 54 may be formed using the same kind of conductive paste as that used when the stretchable wiring part 20 is formed by printing. That is, in the stretchable wiring board 100, the stretchable wiring portion 20 and the lead-out wiring portion 54 are formed of a conductive material in which conductive particles are dispersed and blended in a resin material. The resin material of the conductive material constituting each wiring portion 54 may be of the same type. Here, that the resin materials (resin binder) are of the same kind means that the resin types of the main components of the resin materials are common. That is, a thermoplastic elastomer material can be used as the resin binder of the lead-out wiring portion 54.

  When both the stretchable wiring section 20 and the lead-out wiring section 54 are formed by printing and applying a conductive paste containing a thermoplastic resin binder, not only the stretchable wiring section 20 but also the lead-out wiring section 54 must have fusibility. Become. Thus, by overlapping and heating and / or pressing the ends of the stretchable wiring portion 20 and the lead-out wiring portion 54, the resin binder and the conductive particles are fused and integrated at the bonding portion 56, and the bonding portion 56 is formed. At the interface is suppressed. Further, as described above, the joining process can be simplified by directly joining the stretchable base material 10 and the film base material 60 by the heat press. Therefore, by heating and pressing the reinforcing base material 50 and the stretchable base material 10 in a state where the end portions of the lead wiring portion 54 and the stretchable wiring portion 20 are overlapped with each other, these wires and the base material are identical. Each can be joined and integrated in the process. Therefore, in the stretchable wiring board 100 of the first embodiment, the main surface 11 of the stretchable base material 10 and the main surface 51 of the reinforcing base material 50 are directly joined, and the stretchable wiring portion 20 and the lead-out wiring portion It is preferable that a part (the wiring ends 28, 58) of the parts 54 is fused and integrated to form the joint part 56.

  However, in place of the first embodiment, a thermosetting resin may be used as the resin binder of the conductive paste for forming the lead-out wiring portion 54. In this case, the formed lead-out wiring part 54 has substantially no fusion property, but due to the fusion property of the stretchable wiring part 20, the ends of the lead-out wiring part 54 and the stretchable wiring part 20 are joined to each other. It is joined at the part 56.

  Here, when a low-sliding resin material such as PET, PEN, or PI is used as the film substrate 60 and the lead wiring portion 54 is formed by a printing method, a conductive paste is formed on the surface of the film substrate 60. Instead of applying directly, it is possible to form another layer having better wettability than the film substrate 60 on the surface of the film substrate 60, and then print and apply a conductive paste to the other layer. preferable. Thereby, the resolution of the extraction wiring unit 54 can be increased.

  As shown in FIG. 4B, the reinforcing substrate 50 of the first embodiment has an easy-adhesion layer 64 laminated on the film substrate 60. That is, since the surface of the easy-adhesion layer 64 having good wettability is used as the main surface 51 of the reinforcing substrate 50 instead of the surface of the low-sliding film substrate 60, the lead-out wiring portion 54 is formed by printing. The applicability of the ink (conductive paste) is improved. The surface (the lower surface in FIG. 4B) of the easy-adhesion layer 64 on the side opposite to the film substrate 60 corresponds to the main surface 51 of the reinforcing substrate 50, and the lead-out wiring portion 54 is formed on this surface. On the surface of the reinforcing base material 50 on which the easy-adhesion layer 64 is laminated, a hydrophilic treatment such as corona treatment or a surface treatment such as a roughening treatment is performed to improve the adhesion with the easy-adhesion layer 64. Is preferred. Thereby, the film base 60 and the easy-adhesion layer 64 are more firmly adhered to each other, and the easy-adhesion layer 64 and the stretchable base material 10 are preferably and integrally joined. For this reason, compared with the case where the elastic substrate 10 is directly joined to the surface of the film substrate 60, the bonding strength between the film substrate 60 and the elastic substrate 10 can be improved.

The easy-adhesion layer 64 has higher wettability than the film substrate 60, and the adhesion between the easy-adhesion layer 64 and the elastic substrate 10 is higher than the adhesion between the film substrate 60 and the elastic substrate 10. Is a layer characterized by a high
As the easy-adhesion layer 64, the same kind of elastomer material as the stretchable base material 10 may be used. Although the thickness of the easy-adhesion layer 64 is not particularly limited, by forming the thickness smaller than that of the elastic substrate 10, the overall thickness dimension of the elastic wiring substrate 100 can be suppressed. In addition, as the easy-adhesion layer 64, a thermoplastic resin such as an elastomer material different from the elastic substrate 10, a primer (primer), or an adhesive can be used. By using a thermoplastic resin for the stretchable base material 10 and the easy-adhesion layer 64, the stretchable base material 10 and the easy-adhesion layer 64 can be directly joined by a method such as heat press.

  The terminal portion 30 is formed at one end of the lead wiring portion 54, and a wiring end portion 58 is formed at the other end. The wiring end portion 58 is a portion that is joined to the wiring end portion 28 (see FIG. 3A) of the stretchable wiring portion 20 to form a joint portion 56 (see FIGS. 1 and 2). It is a portion formed wider than the width. In the first embodiment, the form in which the lead-out wiring portion 54 is terminated at the wiring end portion 58 is illustrated, but the position and shape of the wiring end portion 58 are not limited to this.

  The terminal section 30 forms a connector that is inserted into and removed from an external device (not shown). In the first embodiment, as shown in FIG. 4B, an example is shown in which the terminal portions 30 are stacked on the surface (the lower surface side in FIG. 4) of the lead-out wiring portion 54, but the present invention is not limited to this. The terminal portion 30 is formed on the main surface 51 of the reinforcing base material 50, and a lead-out wiring portion 54 is formed so as to ride on the terminal portion 30, and the terminal portion 30 and the lead-out wiring portion 54 are electrically and mechanically connected. You may connect. The terminal sections 30 are individually provided for the plurality of lead wiring sections 54.

  The thickness of the terminal portion 30 is not particularly limited, but may be 5 μm or more and 40 μm or less. By setting the thickness of the terminal portion 30 to 5 μm or more, the durability when the terminal portion 30 is repeatedly inserted into and extracted from an external device can be improved. Further, by setting the thickness of the terminal portion 30 to 40 μm or less, the thickness of the reinforcing region 40 can be suppressed and the flexibility can be ensured.

The terminal portion 30 is formed on the main surface 51 of the reinforcing base material 50 and is connected to the lead-out wiring portion 54. The terminal section 30 is formed of a material different from that of the lead wiring section 54. Specifically, the terminal section 30 is formed of a material having higher wear resistance than the lead wiring section 54.
When the lead-out wiring part 54 is formed by an etching method, the terminal part 30 can be obtained by forming a plating film on the surface of a metal thin film or a foil material for forming the lead-out wiring part 54. Specifically, when the lead wiring portion 54 is formed by etching a thin film or foil material of copper or nickel, a plating film such as gold plating, nickel-gold plating, or solder plating is formed on the end of the lead wiring portion 54. That is, the terminal portion 30 can be formed by laminating a metal layer on a part of the extraction wiring portion 54.
When the lead wiring portion 54 is formed by a printing method, the terminal portion 30 is formed by laminating a wear-resistant and conductive film such as carbon paste on the end of the printed lead wiring portion 54. Can be. Since carbon paste uses non-metallic carbon as conductive particles, suppression of ion migration and improvement of wear resistance can be expected. Further, instead of the first embodiment, the terminal portion 30 and the lead-out wiring portion 54 may be made of the same material. In this case, the terminal portion 30 and the lead-out wiring portion 54 may be integrally formed by the same process using the above-mentioned conductive paste or carbon paste.

As shown in FIG. 4A, the reinforcing base material 50 of the first embodiment includes a strip 50 a forming a cable section with a narrow width, a wide section 50 c wider than the strip 50 a, and And a widened portion 50b whose width (the vertical dimension in the figure) increases from the band-shaped portion 50a toward the large width portion 50c. The terminal portion 30 is provided on the band portion 50a, and the wiring end portion 58 is provided on the wide portion 50c. The lead wiring portion 54 is patterned so as to extend in parallel at the strip portion 50a and radially at the wide portion 50b.
The width of the large width portion 50c is equal to the width of the elastic substrate 10 shown in FIG. Thereby, as shown in FIG. 1 and FIG. 2, by superimposing the reinforcing base material 50 and the elastic base material 10, the elastic wiring substrate 100 of the first embodiment covers the entire width of the elastic base material 10. To provide morphological stability, and handleability is improved.

  As shown in FIG. 3A, the reinforcing region 40 of the elastic substrate 10 has substantially the same shape as the reinforcing substrate 50. The reinforcing base material 50 is superposed such that the main surface 51 on which the lead-out wiring portion 54 is formed faces the reinforcing region 40 on the main surface 11 of the elastic base material 10 on which the elastic wiring portion 20 is formed. You. Thereby, the stretchable base material 10 is laminated on substantially the entire main surface 51 of the reinforcing base material 50.

FIG. 5 is a plan view showing the protective layer 90. The protective layer 90 is an elastic sheet-like cover that covers the surface on which the elastic wiring portion 20 formed on the main surface 11 of the elastic substrate 10 (see FIG. 2). The protective layer 90 according to the first embodiment is formed to have a size that extends not only to the elastic region 42 but also to the reinforcing region 40, and as shown in FIG. 2, the upper surface of the reinforcing substrate 50 (the surface opposite to the main surface 51). Cover.
The protective layer 90 has an opening 92 at a position corresponding to the electrode section 26 as shown in FIG. As a result, the electrode portion 26 formed on the main surface 11 of the elastic substrate 10 is exposed from the opening 92 in a state where the protective layer 90 is laminated on the elastic substrate 10. The protective layer 90 of the first embodiment is configured to cover the entire upper surface side of the elastic wiring board 100 except for the opening 92. That is, the entire reinforcing substrate 50 is covered with the protective layer 90. Thus, the protective layer 90 functions as a cover that protects not only the stretchable wiring section 20 but also the lead-out wiring section 54 and the terminal section 30. However, instead of the first embodiment, the protective layer 90 may be formed so as to cover only the stretchable region 42 and the wide portion 50c of the reinforcing base material 50 (see FIG. 4A).
By providing the protective layer 90, when the stretchable wiring substrate 100 is stretched in the in-plane direction, the entire stretchable base material 10 stretches relatively uniformly, and disconnection of the stretchable wiring portion 20 can be suppressed. . In addition, since the protective layer 90 is formed over the stretchable region 42 and the reinforcement region 40, the stress concentration generated at the edge of the protective layer 90 is dispersed by the reinforcement region 40, and thus the stretchable wiring portion 20 is formed. Can be further suppressed. Further, since the stretchable wiring portion 20 is sandwiched in the thickness direction between the protective layer 90 and the stretchable base material 10, the stretchable wiring portion 20 is positioned substantially at the center of the thickness of the stretchable wiring board 100 in the stretchable region 42. Will be done. For this reason, when the elastic wiring substrate 100 is bent in a direction perpendicular to the plane, the tensile stress and the compressive stress acting on the elastic wiring portion 20 are canceled out, and the elastic wiring portion 20 is protected.

The protective layer 90 is preferably made of an insulating and stretchable material. For example, an elastomer material can be used for the protective layer 90, and a resin material common to the elastic substrate 10 may be used. Thereby, the elastic wiring portion 20 can be protected without impairing the elasticity of the elastic region 42 of the elastic wiring substrate 100. The protective layer 90 can be formed by applying and drying an elastomer-based paste on the film substrate 60 and the elastic substrate 10. In addition, the protective layer 90 formed in a sheet shape in advance and having the openings 92 formed thereon may be attached to the film substrate 60 and the elastic substrate 10 or may be bonded using an adhesive. Good.
The thickness of the protective layer 90 is not particularly limited, but is preferably 100 μm or less, more preferably 50 μm or less, and more preferably 30 μm or less, from the viewpoint that the elasticity of the stretchable wiring board 100 is not hindered. More preferred.

Returning to FIGS. 1 and 2, the stretchable wiring board 100 of the first embodiment has a stretchable auxiliary material 96. The elastic auxiliary material 96 is provided so as to straddle the reinforcing region 40 and the elastic region 42. Specifically, the stretchable auxiliary material 96 is provided over the entire width of the stretchable wiring board 100 and in a region including the joint 56 between the stretchable wiring section 20 and the lead-out wiring section 54.
The elastic auxiliary material 96 has elasticity in the in-plane direction, and can be made of the same type of elastomer material as the elastic base material 10 and the protective layer 90. In the first embodiment, an example is shown in which the stretchable auxiliary material 96 is attached to the upper surface of the protective layer 90, that is, the surface on the opposite side of the stretchable substrate 10 with respect to the protective layer 90, but is not limited thereto. The elastic auxiliary material 96 may be attached to the lower surface of the elastic substrate 10 (the surface opposite to the main surface 11).
The means for attaching the elastic auxiliary material 96 to the protective layer 90 or the elastic base material 10 may use a fusion method by heating, or via an elastic adhesive or pressure-sensitive adhesive (not shown). You may join.
By providing the stretchable auxiliary material 96 as in the first embodiment, when the stretchable region 42 of the stretchable wiring board 100 is elongated, it is possible to disperse the stress that can increase at the boundary with the reinforcing region 40. In addition, it is possible to reduce the risk of disconnection of the elastic wiring portion 20.

A reinforcing member 94 is provided in a region (tip portion) where the terminal portion 30 is formed in the reinforcing region 40. The reinforcing member 94 adjusts the thickness of the distal end portion of the reinforcing base material 50 to the accuracy specified by the connector or the like when the terminal portion 30 is fitted to and connected to a connector or the like (not shown) of an external device. Is a spacer member.
As a material for forming the reinforcing member 94, a low-sliding, corrosion-resistant, high-strength synthetic resin such as PET, PEN, or PI may be used, or a paper material may be used. The reinforcing member 94 may be made of the same material as the film base material 60, or may be made of a material different from the film base material 60. In addition, a thin metal plate may be used for the reinforcing member 94. The reinforcing member 94 is provided on the side opposite to the terminal portion 30 with respect to the reinforcing base 50. In joining the reinforcing member 94 to the reinforcing substrate 50 (the film substrate 60), a general adhesive or adhesive can be used.

  A method for manufacturing the stretchable wiring board 100 according to the first embodiment (hereinafter, referred to as the present method) will be described. FIG. 6 is a schematic view illustrating a manufacturing process of the stretchable wiring board 100. FIG. 7A is an enlarged view showing a state where the stretchable wiring section 20 and the lead-out wiring section 54 are joined, and FIG. 7B is an enlarged view showing the joining section 56.

The method includes at least a stretchable wiring forming step, a lead wiring forming step, and a joining step. The timing of performing the elastic wiring forming step and the leading wiring forming step is arbitrary.
In the elastic wiring forming step, an elastic wiring part 20 having elasticity is formed on at least one main surface 11 of the elastic base material 10. In the lead wiring forming step, the lead wiring part 54 is formed on at least one main surface 51 of the reinforcing base material 50 having higher in-plane rigidity than the elastic base material 10. Then, in the joining step, the main surface 51 of the reinforcing base material 50 is overlapped with the main surface 11 of the elastic base material 10 so as to face a part of the region where the elastic wiring portion 20 is formed. 20 and a part of the lead-out wiring part 54 are joined to each other to conduct each other.

Next, the method will be described in detail.
In the stretchable wiring forming step, a stretchable base material 10 is prepared, and a conductive paste is applied to the main surface 11 by a printing method to form a stretchable wiring portion 20, a wiring end portion 28, and an electrode portion 26. . In order to enhance the handleability of the stretchable base material 10 having stretchability, a separator 110 made of a paper material or the like may be attached to the lower surface of the stretchable base material 10 (the surface opposite to the main surface 11). The separator 110 is preferably peeled off from the elastic substrate 10 when the elastic wiring substrate 100 is used.

  In the lead wiring forming step, the film base material 60 is prepared, and the lead wiring part 54 and the wiring end part 58 are formed after optionally forming the easy-adhesion layer 64 by lamination. When forming the lead-out wiring part 54 by a printing method, an easy-adhesion layer 64 is formed on one surface of the film base material 60, and a conductive paste is applied on the easy-adhesion layer 64 by a printing method to form the lead-out wiring part 54 and It is preferable to form the wiring end 58. Next, the terminal portion 30 is formed at an end (tip portion) of the formed lead-out wiring portion 54 opposite to the wiring end portion 58 by printing a carbon paste or the like. Thereby, the reinforcing base material 50 is completed. Instead of the above, the terminal portion 30 made of carbon paste may be formed before the lead wiring portion 54. Specifically, the terminal portion 30 is formed by printing with carbon paste on the reinforcing base material 50 (the easy-adhesion layer 64), and further the lead wiring portion 54 is formed by printing with conductive paste on the terminal portion 30. Good.

  As shown in FIGS. 7A and 7B, in the joining step, first, the reinforcing base 50 and the elastic base 10 are arranged in a state where the main surface 51 of the reinforcing base 50 and the main surface 11 of the elastic base 10 face each other. And position. Next, the elastic substrate 10 and the reinforcing substrate 50 are heated or pressurized to directly join the main surface 11 of the elastic substrate 10 and the main surface 51 of the reinforcing substrate 50 to form the elastic wiring portion 20. And a part of the lead-out wiring part 54 is integrated by fusion. As a result, a joint 56 (see FIG. 7B) in which the wiring end 28 and the wiring end 58 are fused is formed, and the elastic wiring 20 and the lead-out wiring 54 are electrically connected. Further, the elastic substrate 10 and the reinforcing substrate 50 are directly bonded to each other due to the adhesiveness of the elastomer material. More specifically, in this method, the reinforcing base material 50 and the stretchable base material 10 are joined by heating and pressing to fuse them together. As the heating means, a lamination method using a heating roll or a heating press means can be adopted. The pressing may be performed in the air or may be performed in a vacuum. Thereby, the reinforcing base material 50 (the film base material 60 or the easily adhesive layer 64) is mechanically joined by the heat-fusing property of the stretchable base material 10, and the lead-out wiring portion 54 is heated by the stretchable wiring portion 20. It is mechanically and electrically connected by the fusibility. For this reason, the draw-out wiring part 54 and the elastic wiring part 20 and the reinforcing base material 50 and the elastic base material 10 can be directly connected without using an adhesive or an adhesive. As a result, the connection operation is completed very easily.

  As shown in FIGS. 2 and 6, the stretchable base material 10 is joined to the reinforcing base material 50 so as to cover at least a part of the lead-out wiring part 54. The stretchable base material 10 extends to the vicinity of the terminal portion 30 or to a part of the terminal portion 30 so as to extend to the tip of the reinforcing region 40. That is, a part of the edge 12 of the elastic substrate 10 is closer to the terminal portion 30 than the elastic wiring portion 20. In this way, by covering the lower surface side of the reinforcing base material 50 until the stretchable base material 10 reaches the vicinity of the terminal portion 30, the entire lead wiring portion 54 can be protected by the stretchable base material 10.

Next, a protective layer 90 is formed. The timing of forming the protective layer 90 may be after the end of the joining step of joining the reinforcing base material 50 and the stretchable base material 10, or may be performed simultaneously with the joining step.
The protective layer 90 may be formed by applying an elastomer-based paste to the film substrate 60 and the stretchable substrate 10, or by laminating a sheet made of an elastomer with a heating roll, or using a heating press to form the film base. It may be joined to the material 60 and the elastic substrate 10. In addition, an adhesive layer having elasticity may be provided on the protective layer 90, and the protective layer 90 may be bonded to the film substrate 60 and the elastic substrate 10 by bonding.

Further, a reinforcing member 94 is prepared and bonded to the upper surface of the protective layer 90 (the opposite surface of the film substrate 60) by adhesion or adhesion. Also, an elastic auxiliary material 96 is prepared, and the elastic auxiliary material 96 is provided at the boundary between the reinforcing area 40 and the elastic area 42 so as to include the joint 56 where the wiring end 28 and the wiring end 58 are integrated. The material 96 is joined. The timing of the joining of the reinforcing member 94 and the elastic auxiliary material 96 is arbitrary and may be performed at the same time.
By performing the outer shape processing on the laminated body thus laminated, the stretchable wiring board 100 can be obtained.

[Second embodiment]
The stretchable wiring board 100 according to the first embodiment has a double-sided structure in which the exposed surfaces of the electrode portions 26 and the terminal portions 30 are separately arranged on the upper surface and the lower surface of the stretchable wiring substrate 100. Was. The stretchable wiring board 200 according to the second embodiment has a single-sided structure in which the exposed surfaces of the electrode section 26 and the terminal section 30 are both arranged on one side of the stretchable wiring board 200. Hereinafter, the stretchable wiring board 200 according to the second embodiment of the present invention will be described focusing on contents different from the first embodiment, and the same contents as those in the first embodiment will be omitted as appropriate.

  FIG. 8 is a plan view showing a stretchable wiring board 200 according to the second embodiment of the present invention, and FIG. 9 is a sectional view taken along line WW of FIG. First, an outline of the second embodiment will be described. For convenience, in the following description, the lower side of FIG. 9 may be referred to as the lower side, and the upper side of FIG. 9 and the near side of FIG. 8 may be referred to as the upper side. However, this is defined for the sake of convenience in order to explain the relative positional relationship of the components, and does not always coincide with the vertical direction of gravity.

  The stretchable wiring board 200 of the second embodiment includes a stretchable base material 10a (first stretchable base material), a stretchable wiring portion 20 formed on at least one main surface 11a of the stretchable base material 10a, Reinforcing substrate 50, lead-out wiring portion 54 formed on main surface 52 on at least one side of reinforcing substrate 50, elastic substrate 10 b (second elastic substrate), at least one side of elastic substrate 10 b Is provided on the main surface 11b. The main surface 11b of the stretchable base material 10b faces and overlaps with the main surface 11a of the stretchable base material 10a and the main surface 52 of the reinforcing base material 50 on the lead-out wiring portion 54 side. Further, a part of the elastic wiring part 20 and a part of the connection elastic wiring part 21 are joined together, and a part of the lead-out wiring part 54 and the part of the connection elastic wiring part 21 are joined together. Thus, the stretchable wiring section 20 and the lead-out wiring section 54 are electrically connected via the connection stretchable wiring section 21.

  In the examples of FIGS. 8 and 9, the main surface 51 of the reinforcing base 50 on the side opposite to the lead-out wiring portion 54 and the main surface 11 a of the elastic base 10 a are joined. It does not need to be joined to the conductive base material 10a. For example, an elastic substrate separate from the elastic substrate 10a may be joined to the main surface 51 of the reinforcing substrate 50. Even with such a structure, since the elastic substrate 10b has a function of connecting the reinforcing substrate 50 and the elastic substrate 10a, the integrated elastic wiring substrate 200 can be formed.

  Since the elastic wiring portion 20 formed on the elastic substrate 10a has elasticity, for example, even when the elastic wiring substrate 200 is attached to the body surface of a living body, the elastic wiring substrate 200 It can flexibly follow the movement of the body surface. Further, the connection operation to the external device through the lead-out wiring portion 54 formed on the reinforcing base material 50 having higher in-plane rigidity than the elastic base material 10a is facilitated by the strength of the reinforcing base material 50. In addition, since the stretchable wiring section 20 and the lead-out wiring section 54 can be electrically and mechanically connected via the connection stretchable wiring section 21, it is possible to prevent the joint between the wires from being broken. As a result, a highly reliable elastic wiring substrate can be realized.

As described above, the stretchable wiring board 200 of the second embodiment includes the stretchable base material 10b (the second stretchable base material), the connection stretchable wiring portion 21 (the stretchable wiring portion), and the stretchable base material 10b. Also includes a reinforcing base material 50 having high in-plane rigidity and a lead-out wiring portion 54. The connection elastic wiring portion 21 is formed on at least one main surface 11b of the elastic base material 10b, and has elasticity. The lead-out wiring part 54 is formed on at least one main surface 52 of the reinforcing base material 50. The main surface 52 of the reinforcing base material 50 is overlapped with a part of the formation region of the connection elastic wiring portion 21 so as to face the main surface 11b of the elastic base material 10b. Then, a part of the connection elastic wiring part 21 and a part of the extraction wiring part 54 are joined to each other and are electrically connected to each other.
Thus, the stretchable wiring board 200 of the second embodiment can realize a stretchable wiring board having the single-sided structure while including the same structure as the stretchable wiring board 100 of the first embodiment. Here, “reinforcement” of the reinforcing base material 50 means that the in-plane rigidity of the entire stretchable wiring board 100 or 200 is partially reinforced and stiffened, and the stretchable wiring board 100 or the stretchable wiring This also means that the in-plane rigidity of some members forming the substrate 200 is reinforced.

Next, the stretchable wiring board 200 of the second embodiment will be described in detail.
The stretchable wiring board 200 has at least one terminal 30 as in the first embodiment, and is used by being connected to various external devices. External devices to be connected are the same as in the first embodiment.

FIG. 10A is a plan view of the stretchable base material 10b on which the connection stretchable wiring portion 21 is formed on the main surface 11b viewed from the upper surface side (upper side in FIG. 9). FIG. 10 is a plan view of the stretchable base material 10a viewed from the top side (upper side in FIG. 9) in a state where the stretchable base material 10b illustrated in FIG. 10A is separated from the stretchable wiring board 200.
The stretchable wiring portion 20 is a stretchable conductive pattern formed on one or both sides of the stretchable base material 10a. The illustrated stretchable wiring portion 20 is formed on one main surface 11a of the stretchable base material 10a. The pattern shape of the elastic wiring portion 20 is not particularly limited. FIG. 10B illustrates an example in which a plurality of line-shaped elastic wiring portions 20 are formed by printing on the main surface 11a. Each of the elastic wiring portions 20 has a wiring end portion 28 forming the joint portion 56a and an electrode portion 26 at both ends.
The shape and configuration of each electrode section 26 are not particularly limited. The electrode portion 26 illustrated in FIG. 10B is formed by a substantially rectangular conductive pattern, but may be configured in the same manner as the first embodiment (the first electrode 26a and the second electrode 26b). Good.
The wiring end 28 of the elastic wiring part 20 is joined to a wiring end 29 of the connecting elastic wiring part 21 described later to form a joint 56a. The shape and configuration of the wiring end 28 are not particularly limited. The wiring end portion 28 is formed, for example, to be wider than the elastic wiring portion 20, similarly to the wiring end portion 28 (see FIG. 3A) in the first embodiment.

The connection stretchable wiring portion 21 is a stretchable conductive pattern formed on one or both sides of the stretchable base material 10b. The illustrated connection stretchable wiring portion 21 is formed on one main surface 11b of the stretchable base material 10b. The pattern shape of the connection elastic wiring portion 21 is not particularly limited as long as it can be joined to the wiring end portion 28 of the above-described elastic wiring portion 20 and to the wiring end portion 58 of the lead-out wiring portion 54 described later. FIG. 10A illustrates an example in which a plurality of linear connection elastic wiring portions 21 are formed by printing on the main surface 11b. Each connection stretchable wiring portion 21 forms a wire end portion 29 that forms a bonding portion 56a with the wiring end portion 28 of the stretchable wiring portion 20, and a wiring end portion 58 and a bonding portion 56b of a lead-out wiring portion 54 described later. A wiring end 59 is provided at each end.
The wiring end portion 29 of the connection stretchable wiring portion 21 is joined to the wiring end portion 28 of the stretchable wiring portion 20 to form a joint portion 56a, and the wiring end portion 59 is a wiring end portion of a lead wiring portion 54 described later. The joint 58b is joined to the joint 58 to form a joint 56b. The shapes and configurations of the wiring ends 29 and 59 are not particularly limited. The wiring end portions 29 and 59 are formed, for example, to be wider than the connection elastic wiring portion 21.
Further, the connection stretchable wiring portion 21 straddles a vertical step (upward in FIG. 9) between the main surface 11 a of the stretchable base material 10 a and the main surface 52 of the reinforcing base material 50, and And the wiring end portion 58 of the lead-out wiring portion 54. As will be described later, the connection stretchable wiring portion 21 is joined to a part of the stretchable wiring portion 20 and a part of the lead-out wiring portion 54 by heating or pressing in a state formed on the stretchable base material 10b by a printing method. In addition, it is possible to prevent the deterioration of the wiring quality due to the step.

The stretchable substrates 10a and 10b have stretchability that extends in the in-plane direction by an external force, and are configured by a single layer or a laminate of a plurality of stretchable layers. The elasticity, material, thickness, elongation, and the like of the elastic substrates 10a and 10b are as described for the elastic substrate 10 of the first embodiment.
It is desirable that the stretchable substrates 10a and 10b be of the same material and of the same thickness. This is because the manufacturing process can be simplified without increasing the types of members. However, at least one of the material and the thickness of the elastic substrate 10a and the elastic substrate 10b may be different from each other.

It can be said that the stretchable wiring board 200 has the reinforcement region 40 and the stretchable region 42 having lower in-plane rigidity than the reinforcement region 40 and elasticity. The reinforcement region 40 and the expansion / contraction region 42 are as described in the first embodiment.
In the second embodiment, the elastic region 42 includes a planar region including only the elastic substrate 10a and a planar region in which the elastic substrates 10a and 10b are stacked (denoted as an intermediate region 43). included. That is, in the intermediate region 43, the main surface 11b of the elastic base material 10b is directly joined to the main surface 11a of the elastic base material 10a and the main surface 52 of the reinforcing base material 50, and This is an area that covers a part of the surface 11a and a part of the main surface 52 of the reinforcing substrate 50. As described above, since the stretchable base material 10a and the stretchable base material 10b are stacked in the intermediate region 43, the in-plane rigidity is higher than in the stretchable regions 42 other than the intermediate region 43. That is, in the elastic region 42 of the second embodiment, the in-plane stiffness is gradually reduced from the region (the intermediate region 43) close to the reinforcing region 40, whereby the vicinity of the boundary between the reinforcing region 40 and the elastic region 42 is reduced. , And the disconnection of the wiring portion can be suppressed.
Further, in the examples of FIGS. 8 and 9, only one reinforcing region 40 is provided on the left side of the elastic wiring board 200, but the present invention is not limited to this, and the reinforcing region 40 may be provided at a plurality of positions. Good.

The reinforcing substrate 50 is a member having higher in-plane rigidity than the elastic substrates 10a and 10b, and constituting the reinforcing region 40. The configuration, material, thickness, and the like of the reinforcing substrate 50 are as described in the first embodiment. For example, the reinforcing substrate 50 may include the film substrate 60 and the easy-adhesion layer 64 having higher in-plane rigidity than the elastic substrates 10a and 10b.
The reinforcing substrate 50 exemplified in FIGS. 8 and 9 is joined to the elastic substrate 10a on the lower surface side and to the elastic substrate 10b on the upper surface side. Specifically, the main surface 51 on the lower surface side of the reinforcing base material 50 is joined to the main surface 11a on the upper surface side of the elastic base material 10a, and the main surface 52 on the upper surface side of the reinforcing base material 50 is It is joined to the main surface 11b on the lower surface side of the material 10b. The joining method between the reinforcing base material 50 and the elastic base materials 10a and 10b is the same as the joining method between the elastic base material 10 and the reinforcing base material 50 in the first embodiment. In order to increase the adhesion between the stretchable bases 10a and 10b and the reinforcing base 50, an easy-adhesion layer 64 (adhesive, a thin adhesive layer of the same material as the stretchable bases 10a and 10b, etc.) ).

The lead wiring portion 54 is a conductive pattern formed on one or both surfaces of the reinforcing base material 50. The drawn wiring portion 54 is formed on the main surface 52 on the upper surface side of the reinforcing base material 50. The pattern shape of the lead wiring portion 54 is not particularly limited. FIG. 10B illustrates an example in which a plurality of linear lead-out wiring portions 54 are formed by printing on the main surface 52. Each of the lead-out wiring portions 54 has a wiring end portion 58 of the connection elastic wiring portion 21, a wiring end portion 58 forming the joint portion 56 b, and the terminal portion 30 at both ends.
The wiring end portion 58 of the lead-out wiring portion 54 is joined to the wiring end portion 59 of the connection stretchable wiring portion 21 to form a joint 56b. The shape and configuration of the wiring end 58 are not particularly limited. The wiring end portion 58 is formed, for example, wider than the lead wiring portion 54.
The terminal unit 30 forms a connector that is inserted into and removed from an external device (not shown). In the second embodiment, as shown in FIG. 9, the terminal section 30 is formed by lamination on the upper surface side of the lead-out wiring section 54. However, the configuration of the terminal section 30 is not limited to this. Further, the thickness, the material, the forming method, and the like of the terminal portion 30 are as described in the first embodiment.

  Further, in the second embodiment, the main surface 11b of the elastic substrate 10b is overlapped with the main surface 11a of the elastic substrate 10a and the main surface 52 of the reinforcing substrate 50 facing each other. Then, at the joint 56a, the ends of the elastic wiring portion 20 and the connection elastic wiring portion 21 are joined to each other so as to be electrically connected to each other, and at the joint 56b, the lead-out wiring portion 54 and the connection elastic wiring portion 21 are connected. Are joined to each other to conduct each other. As a result, the elastic wiring part 20 and the lead-out wiring part 54 are electrically connected via the connection elastic wiring part 21.

  More specifically, the wiring end portion 28 of the stretchable wiring portion 20 and the wiring end portion 29 of the connection stretchable wiring portion 21 are fused and integrated, and the wiring end portion 58 of the lead-out wiring portion 54 and the connection stretchable wiring portion 21 The wiring end portion 59 is fused and integrated. As described above, since the elastic wiring portion 20 and the lead-out wiring portion 54 are integrated by the connection elastic wiring portion 21, the joint portions 56a and 56b also have elasticity. As a result, when an extension operation is applied to the stretchable wiring substrate 200, disconnection of the wiring portion can be suppressed, and breakage of the conductive state can be prevented. Furthermore, since the joints 56a and 56b are formed at positions separated from the vicinity of the boundary between the reinforcement region 40 and the expansion and contraction region 42, disconnection of the wiring portion due to stress concentration can be suppressed.

  The stretchable wiring section 20, the connection stretchable wiring section 21, and the lead-out wiring section 54 are formed of a conductive material in which conductive particles are dispersed and mixed in a resin material. The conductive material here is also as described for the elastic wiring portion 20 of the first embodiment. The stretchable wiring section 20, the connection stretchable wiring section 21, and the lead-out wiring section 54 include a resin binder, so that the stretchable base sections 10a and 10b expand and contract, so that the stretchable wiring section 20, the connection stretchable wiring section 21, and the lead-out section. Breakage of the wiring portion 54 is suppressed. The resin binder is also as described in the first embodiment.

  It is desirable that the resin material of the conductive material forming each of the elastic wiring portion 20, the connection elastic wiring portion 21, and the lead-out wiring portion 54 is of the same kind. This is because electrical and mechanical connectivity at the time of fusion and integration of each wiring portion can be enhanced, and reliability and durability when the stretchable wiring substrate 200 is extended can be enhanced. For example, by using an elastomer material for the resin binder of the stretchable wiring part 20, the connection stretchable wiring part 21, and the lead-out wiring part 54, at least one of heating and pressing is performed when the wiring parts are joined to each other. Thereby, the respective wiring portions can be fused and integrated. As described above, since the stretchable wiring portion 20, the connection stretchable wiring portion 21, and the lead-out wiring portion 54 include the thermoplastic resin binder, the wires are fused and integrated by utilizing the fusion property, and mechanical and Can be electrically connected.

However, a thermoplastic resin may be used for the resin binder of one of the two wiring portions to be joined. For example, a thermoplastic resin may be used for the resin binder only in the interposed connection elastic wiring portion 21. Also in this case, the wires can be mechanically and electrically connected to each other by utilizing the fusion bonding property of the connection stretchable wiring portion 21.
In addition, the lead wiring portion 54 may or may not have elasticity. Since the lead-out wiring portion 54 is disposed in the reinforcing region 40 having higher in-plane rigidity than the stretchable region 42, the degree of extension when the stretchable wiring board 200 is subjected to the extension operation is smaller than that of the stretchable region 42. is there.

The method of forming the stretchable wiring section 20, the connection stretchable wiring section 21, and the lead-out wiring section 54 is not particularly limited. For example, each wiring portion can be formed by a printing method. The printing method is as described in the first embodiment. The electrode part 26 and the wiring end 28 of the elastic wiring part 20, the wiring ends 29 and 59 of the connecting elastic wiring part 21, and the wiring end 58 of the lead-out wiring part 54 are also connected to each wiring part. Print formation may be performed in the same process. As a result, not only the manufacturing process can be simplified, but also extensibility can be obtained at the wiring end portions 28, 29, 58, and 59.
The lead wiring portion 54 may be formed by another method (for example, an etching method). The etching method is as described in the first embodiment.

  The thickness and width of the stretchable wiring portion 20, the connection stretchable wiring portion 21, and the lead-out wiring portion 54 are determined by the resistivity of each wiring portion when no load is applied, the resistance change when the stretchable wiring substrate 200 is stretched, and the elasticity. What is necessary is just to determine based on restrictions of the thickness dimension and width dimension of the whole wiring board 200, etc. The preferred thickness and width dimensions of each wiring section are the same as those of the elastic wiring section 20 described in the first embodiment.

  As shown in FIG. 10B, the stretchable base material 10 a according to the second embodiment includes a narrow band portion 50 a constituting a cable portion, a wide width portion 50 c wider than the belt portion 50 a, A stretchable wiring board according to the second embodiment having a main surface shape including a widened portion 50b whose width dimension (vertical dimension in the figure) increases from the band-shaped portion 50a toward the wide width portion 50c. It has a planar shape of 200. The expansion / contraction region 42 is provided in the wide portion 50c.

  The reinforcing base material 50 has a main surface having the same shape as the end of the band-shaped part 50a, the widened part 50b, and the wide part 50c of the elastic base material 10a on the band-shaped part 50a side. Thereby, by superimposing the reinforcing base material 50 and the stretchable base material 10a, the stretchable wiring board 200 can have shape stability over the entire width of the stretchable base material 10a, and handleability is improved. It will be good. The terminal portion 30 is provided on the band portion 50a, and the wiring end portion 58 is provided on the widened portion 50b. The lead-out wiring part 54 is patterned so as to extend in parallel from the belt-shaped part 50a to the middle of the widened part 50b and radially toward each wiring end 58.

As shown in FIG. 10A, the stretchable base material 10 b is also formed on the stretchable base material 10 a on the side of the strip 50 a in the stretchable base material 10 a, the widened portion 50 b and the wide width portion 50 c, similarly to the reinforcing base material 50. It has a main surface of the same shape as the tip. However, in the stretchable base material 10b, the length of the strip 50a (the length in the left-right direction in the figure) is shorter than the length of the strip 50a of the stretchable base 10a and the reinforcing base 50, The length of the wide portion 50c (the length in the left-right direction in the figure) is longer than the length of the wide portion 50c of the reinforcing base material 50. The wide width portion 50c of the stretchable base material 10b forms a part of the reinforcement region 40 and an intermediate region 43 in the stretchable region 42. The wiring end portions 59 and 29 are provided in the widened portion 50b and the wide width portion 50c, respectively, and the connection stretchable wiring portion 21 is linearly patterned.
The main surface 11b of the elastic substrate 10b on which the connection elastic wiring portion 21 is formed is the main surface 11a of the elastic substrate 10a on which the elastic wiring portion 20 is formed and the reinforcement laminated on the main surface 11a. It is directly joined to the main surface 52 of the base material 50 on which the lead wiring portion 54 is formed. More specifically, the stretchable base material 10b is disposed at a position where the edge 13b overlaps a part of the terminal portion 30 formed at the tip of the lead-out wiring portion 54, and the edge 13a is positioned at the stretchable wiring portion 20. Are overlapped so as to be arranged at a position closer to the electrode portion 26 than the wiring end portion 28 in FIG. As a result, the main surface 11b of the elastic base material 10b covers a part of the main surface 11a of the elastic base material 10a and a part of the main surface 52 of the reinforcing base material 50 (an area excluding the exposed area of the terminal portion 30). .

  A reinforcing member 94 is provided in a region (tip portion) where the terminal portion 30 is formed in the reinforcing region 40. The reinforcing member 94 of the second embodiment is provided on the main surface of the stretchable base material 10a on the opposite side to the reinforcing base material 50 side and at the tip end portion where the terminal portion 30 is formed. The reinforcing member 94 adjusts the thickness of the distal end portion of the reinforcing base material 50 to the accuracy specified by the connector or the like when the terminal portion 30 is fitted to and connected to a connector or the like (not shown) of an external device. Is a spacer member. The material and the joining method of the reinforcing member 94 are as described in the first embodiment.

  Hereinafter, a method for manufacturing the stretchable wiring board 200 according to the second embodiment (hereinafter, referred to as the present method) will be described. FIG. 11 is a schematic view illustrating a manufacturing process of the stretchable wiring board 200.

The method includes at least a stretchable wiring forming step, a lead wiring forming step, and a joining step. The timing of performing the elastic wiring forming step and the leading wiring forming step is arbitrary.
In the stretchable wiring forming step, a stretchable connection stretchable wiring portion 21 (stretchable wiring portion) is formed on at least one main surface 11b of the stretchable base material 10b (second stretchable base material). In the lead wiring forming step, the lead wiring part 54 is formed on at least one main surface 52 of the reinforcing base material 50 having higher in-plane rigidity than the elastic base material 10b. In the joining step, the main surface 52 of the reinforcing base material 50 is overlapped with the main surface 11b of the elastic base material 10b so as to face a part of the region where the elastic wiring portion 21 is formed. The part 21 and a part of the lead-out wiring part 54 are joined to each other to conduct each other.

Next, the method will be described in detail.
The method includes, in detail, a step of forming the stretchable wiring section 20, a step of forming the lead-out wiring section 54, a step of forming the connection stretchable wiring section 21, a joining step of the reinforcing base material 50, Bonding step. However, in the case where the reinforcing base material 50 is not bonded to the elastic base material 10a in the elastic wiring substrate 200, the joining step of the reinforcing base material 50 is omitted.
In the step of forming the stretchable wiring portion 20, the stretchable base material 10a is prepared, and a conductive paste is applied to the main surface 11a by a printing method to form the stretchable wiring portion 20, the wiring end portion 28, and the electrode portion 26. To form In order to enhance the handleability of the stretchable base material 10a having stretchability, a separator or release made of paper or a film material is applied to the lower surface of the stretchable base material 10a (opposite the main surface 11a). Good. The separator or the release may be appropriately peeled from the elastic substrate 10a.
Before or after this step, the reinforcing member 94 is joined to the lower surface of the elastic substrate 10a. The reinforcing member 94 can be joined to the elastic base material 10a using a general adhesive or adhesive.

In the step of forming the lead-out wiring part 54, the reinforcing base material 50 is prepared, and a conductive paste is applied to the main surface 52 by a printing method to form the lead-out wiring part 54 and the wiring end part 58. Further, a terminal portion 30 is formed at an end (tip) of the formed lead-out wiring portion 54 opposite to the wiring end portion 58 by printing a carbon paste or the like.
When the easy-adhesion layer 64 is used for joining the reinforcing base material 50 and the elastic base material 10b, a film base material 60 for forming the reinforcing base material 50 is prepared, and the easy-adhesion layer 64 is formed on the main surface 52 side. Lamination is formed. Then, a conductive paste is applied on the easy-adhesion layer 64 by a printing method, so that the lead-out wiring portion 54 and the wiring end portion 58 can be formed.
In the case where the easy-adhesion layer 64 is used for joining the reinforcing base material 50 and the stretchable base material 10a, the easy-adhesion layer 64 may be laminated on the main surface 51 of the film base material 60.

  In the step of forming the connection stretchable wiring portion 21, the stretchable base material 10b is prepared, and a conductive paste is applied to the main surface 11b by a printing method to form the connection stretchable wiring portion 21, the wiring end portions 29 and 59. To form In order to enhance the handleability of the stretchable base material 10b having stretchability, a separator made of a paper material or the like may be adhered to the upper surface (opposite the main surface 11b) of the stretchable base material 10b. The separator may be appropriately separated from the elastic base material 10b, for example, when using the elastic wiring substrate 200.

  In the joining step of the reinforcing base material 50, the main surface 11a of the elastic base material 10a and the main surface 51 of the reinforcing base material 50 are directly bonded. The joining method between the reinforcing base material 50 and the elastic base material 10a is the same as the joining method between the reinforcing base material 50 and the elastic base material 10 in the first embodiment. For example, the reinforcing base 50 and the stretchable base 10a may be joined by the easy-adhesion layer 64 as described above.

  In the wiring section joining step, first, the main surface 11b of the elastic substrate 10b faces the main surface 11a of the elastic substrate 10a and the main surface 52 of the reinforcing substrate 50, and then the connecting elastic wiring The elastic substrate 10b on which the portion 21 is formed is aligned with the elastic substrate 10a on which the reinforcing substrate 50 is joined and the elastic wiring portion 20 is formed. As shown in FIG. 10A, since the shape in plan view including a part of the band-shaped portion 50 a, the widened portion 50 b, and a part of the wide width portion 50 c is equal between the stretchable base material 10 a and the stretchable base material 10 b, Positioning is performed such that the edge lines of the widened portion 50b are aligned or parallel.

Next, the elastic substrate 10a, the reinforcing substrate 50, and the elastic substrate 10b are heated or pressurized, and the main surface 11b of the elastic substrate 10b is changed to the main surface 52 of the reinforcing substrate 50 and the elastic substrate. The wiring end portion 28 of the stretchable wiring portion 20 and the wiring end portion 29 of the connection stretchable wiring portion 21 are directly joined to the main surface 11a of the wiring portion 10a, and the wiring end portion 58 of the lead-out wiring portion 54 and the connection stretchability The wiring end portion 59 of the wiring portion 21 is fused and integrated. As a result, a joint portion 56a in which the wiring end 28 and the wiring end 29 are fused is formed, so that the elastic wiring portion 20 and the connection elastic wiring portion 21 conduct. Further, a joining portion 56b in which the wiring end portion 59 and the wiring end portion 58 are fused is formed, and the lead-out wiring portion 54 and the connection stretchable wiring portion 21 are electrically connected. As a result, the elastic wiring part 20 and the lead-out wiring part 54 are electrically connected via the connecting elastic wiring part 21.
The joining method between the elastic substrate 10b and the reinforcing substrate 50 is the same as the joining method between the elastic substrate 50 and the elastic substrate 10 in the first embodiment. The bonding between the stretchable base material 10a and the stretchable base material 10b is realized by heat-pressing (heating and pressurizing) the stretchable base materials 10a and 10b and fusing them with each other due to the heat-fusibility of the two materials. Is done. As the heating means, a lamination method using a heating roll or a heating press means can be adopted. The pressing may be performed in the air or may be performed in a vacuum. In addition, the heating and the pressing may be performed indirectly instead of directly on the elastic substrate 10a, the reinforcing substrate 50, or the elastic substrate 10b. For example, the reinforcing substrate 50 may not be heated or pressed directly, but may be heated or pressed indirectly via the elastic substrate 10a and the elastic substrate 10b.

  In the above description, the manufacturing method in which the joining step of the reinforcing base material 50 has already been completed at the time of the joining step of the wiring section has been described. May be included. In this case, the stretchable base material 10b on which the connection stretchable wiring portion 21 is formed, the reinforcing base material 50 on which the lead-out wiring portion 54 is formed, and the stretchable wiring in a state where the reinforcing base material 50 is not joined. In a state where the stretchable base materials 10a on which the portions 20 are formed are aligned with each other, they are joined by heat pressing.

  As described above, the stretchable wiring board 200 according to the second embodiment has a simple process of positioning the stretchable bases 10a and 10b and the reinforcing base 50 on which the respective wiring portions are respectively formed and heating and pressing. Can be manufactured. Further, since the method does not include the step of printing the stretchable wiring portion across the stretchable region 42 and the reinforcement region 40, the wiring quality of the wiring portion at the boundary between the reinforcement region 40 and the stretchable region 42 is reduced. Deterioration can be prevented.

[First Modification of Second Embodiment]
Hereinafter, the stretchable wiring board 300 in the first modified example of the second embodiment (hereinafter, referred to as a first modified example) will be described focusing on contents different from the above-described second embodiment. FIG. 12 is a plan view showing a stretchable wiring board 300 according to a modification of the second embodiment of the present invention, and FIG. 13 is a sectional view taken along line VV of FIG.

In the stretchable wiring board 300 of the first modification, the main surface 11b of the stretchable base material 10b covers the entire stretchable wiring section 20 and the lead-out wiring section 54 except for the electrode section 26 and the terminal section 30. In the example shown in FIGS. 12 and 13, the stretchable wiring board 300 entirely covers the main surface 11 a of the stretchable base material 10 a and the main surface 52 of the reinforcing base material 50 except for a certain partial region. The partial regions are a plurality of electrode exposed portions 70 for exposing the respective electrode portions 26 above the elastic wiring substrate 300 (above the plane of FIG. 13) and a terminal exposed portion 72 for exposing the terminal portions 30 to the same upper portion. . However, if the main surface 11a of the stretchable base material 10a and the main surface 52 of the reinforcing base material 50 are entirely covered, the partial region may include a region other than the electrode exposed portion 70 and the terminal exposed portion 72. . The elastic wiring board 300 of the first modified example has a reinforcing area 40 and an elastic area 42 and does not have an intermediate area 43 unlike the second embodiment.
When at least the stretchable wiring section 20 and the connection stretchable wiring section 21 are formed of a material having a low Young's modulus and elasticity, the stretchable base material 10b is also connected to the wiring sections in order to impart durability to the wiring sections. It is desirable to be formed of the same material.

  Thus, in the first modification, the stretchable base material 10b covers the stretchable wiring portion 20, the connection stretchable wiring portion 21, and the lead-out wiring portion 54 as a whole. Thus, the stretchable base material 10b not only has a function of connecting the stretchable wiring portion 20 and the lead-out wiring portion 54 as in the second embodiment, but also has a function as a stretchable cover that covers each wiring portion. Can be prepared. In other words, in the first modification, the stretchable cover (the stretchable base material 10b) is provided with the connection stretchable wiring portion 21, and as a result, both the wiring connection and the cover are performed by the joining process of the stretchable cover. And rationalization in both the structure and the manufacturing process can be realized.

[Second Modification of Second Embodiment]
In the above-described second embodiment, the protective layer 90 is not particularly mentioned. The stretchable wiring board 200 of the second embodiment described above may further include a protective layer 90 that covers the surface on which the stretchable wiring portion 20 is formed on the main surface 11a of the stretchable base material 10a. Further, the protective layer 90 may be provided so as to cover not only the surface on which the elastic wiring portion 20 is formed but also at least a part of the upper surface (the opposite surface of the main surface 11b) of the elastic substrate 10b.

FIG. 14 is a cross-sectional view taken along line WW, assuming that FIG. 8 shows a plan view of a stretchable wiring board 400 according to a second modification of the second embodiment. However, FIG. 14 illustrates a state in which the stretchable base material 10b on which the connection stretchable wiring portion 21 is formed is separated from the stretchable wiring board 400 for easy understanding. As shown in FIG. 14, an elastic auxiliary material 96 may be provided.
That is, in the second modification, the elastic auxiliary material 96 extends from the end of the main surface 52 of the reinforcing base 50 to the end of the main surface 11a of the elastic base 10a across the edge 53 of the reinforcing base 50. May be provided. In this case, when the elastic substrate 10b on which the connection elastic wiring portion 21 is formed is joined to the reinforcing substrate 50 and the elastic substrate 10a, the connection elastic wiring portion 21 Each of the main surfaces abuts on a step between the surface 52 and the main surface 11a of the elastic base material 10a. The connection stretchable wiring portion 21 can eliminate the step due to the stretchability, but can reduce the level difference by the stretchable auxiliary material 96, so that the disconnection of the connection stretchable wiring portion 21 in the manufacturing process can be prevented. It can be reliably prevented.
The material of the elastic auxiliary material 96 is as described in the first embodiment.

The present invention is not limited to the above-described embodiments and modifications, but includes various modifications and improvements as long as the object of the present invention is achieved.
For example, on the stretchable wiring boards 100, 200, 300, and 400 (hereinafter, referred to as 100 and the like), a sticking layer (shown in FIG. ) May be provided. The sticking layer may be provided on the upper surface side (may be on the protective layer 90) of the elastic wiring substrate 100 or the like, or on the lower surface side (that is, the elastic base material), depending on the use of the elastic wiring substrate 100 or the like. 10 may be provided on the surface opposite to the main surface 11 and the surface opposite to the main surface 11a of the stretchable base material 10a. The sticking layer can be made of a gel agent or an adhesive.

  Various components such as the stretchable wiring board 100 of the present invention do not need to be present independently. That a plurality of components are formed as one member, that one component is formed of a plurality of members, that one component is a part of another component, that one component is It is allowed that the part overlaps with some of the other components.

The embodiment includes the following technical idea.
(1) A stretchable base material, a stretchable wiring portion formed on at least one main surface of the stretchable base material and having stretchability, and a reinforcing base material having higher in-plane rigidity than the stretchable base material And a lead-out wiring portion formed on at least one main surface of the reinforcing base material, wherein the main surface of the reinforcing base material expands and contracts with respect to a part of a formation region of the elastic wiring portion. A stretchable wiring board, wherein the stretchable wiring board is superposed facing the main surface of the conductive base material, and a part of the stretchable wiring section and a part of the lead-out wiring section are joined to each other to conduct with each other.
(2) The main surface of the elastic substrate and the main surface of the reinforcing substrate are directly joined to each other, and the elastic wiring portion and the lead-out wiring portion are partially integrated with each other. The stretchable wiring board according to 1).
(3) The reinforcing base includes a film base having higher in-plane rigidity than the stretchable base, and an easy-adhesion layer laminated on the film base, and the film in the easy-adhesion layer is provided. The stretchability according to (1) or (2), wherein the lead-out wiring portion is formed on a main surface opposite to the base material, and the easy-adhesion layer and the stretchable base material are integrally joined. Wiring board.
(4) From the above (1), wherein a terminal portion is formed on the main surface of the reinforcing base material and connected to the lead-out wiring portion, and the terminal portion is formed of a material different from the lead-out wiring portion. The stretchable wiring board according to any one of 3).
(5) The stretchable base material covers at least a part of the lead-out wiring portion, and a part of an edge of the stretchable base material is closer to the terminal portion than the stretchable wiring portion. The stretchable wiring board according to (4).
(6) The stretchable wiring portion and the lead-out wiring portion are formed of a conductive material in which conductive particles are dispersed and mixed in a resin material, and the stretchable wiring portion and the lead-out wiring portion are respectively formed. The stretchable wiring board according to any one of (1) to (5), wherein the resin materials of the conductive material are the same.
(7) a step of forming an elastic wiring portion having elasticity on at least one main surface of the elastic substrate, and a step of forming a main substrate on at least one side of the reinforcing substrate having higher in-plane rigidity than the elastic substrate. Forming a lead-out wiring portion on a surface, and superposing the main surface of the reinforcing base material on a part of a region where the elastic wiring portion is formed so as to face the main surface of the elastic base material. Joining the stretchable wiring portion and a part of the lead-out wiring portion to each other and conducting each other,
A method for manufacturing a stretchable wiring board, comprising:
(8) The elastic substrate and the reinforcing substrate are heated or pressed to directly join the main surface of the elastic substrate and the main surface of the reinforcing substrate, and the elastic wiring portion And a method of manufacturing a stretchable wiring board according to the above (7), wherein a part of the lead-out wiring portion is integrated with each other.
(9) a first elastic substrate;
An elastic wiring portion having elasticity formed on at least one main surface of the first elastic base material,
A reinforcing substrate having a higher in-plane rigidity than the first elastic substrate,
Lead-out wiring portion formed on at least one main surface of the reinforcing base material,
A second elastic substrate,
A connection elastic wiring portion having elasticity formed on at least one main surface of the second elastic base material,
With
The main surface of the second stretchable base material is overlapped facing the main surface of the first stretchable base material and the main surface of the reinforcing base material on the side of the lead-out wiring portion,
A part of the elastic wiring part and the connection elastic wiring part are joined to each other, and a part of the lead wiring part and the connection elastic wiring part are joined to each other, and the elastic wiring part and the extraction wiring part Are electrically connected to each other via the connection elastic wiring portion,
A stretchable wiring board, characterized in that:
(10) a main surface of the reinforcing base opposite to the lead-out wiring portion and the main surface of the first stretchable base are joined;
The stretchable wiring board according to the above (9).
(11) a part of the stretchable wiring portion and the connection stretchable wiring portion are fused and integrated, and a part of the extraction wiring portion and the connection stretchable wiring portion are fused and integrated;
The stretchable wiring board according to the above (9) or (10).
(12) The main surface of the second elastic substrate is directly joined to the main surface of the first elastic substrate and the main surface of the reinforcing substrate on the side of the lead-out wiring portion, Covering at least a part of the main surface of the first stretchable base material and at least a part of the main surface of the reinforcing base material,
The stretchable wiring board according to any one of (9) to (11).
(13) The main surface of the second stretchable base material covers the entire stretchable wiring portion and the lead-out wiring portion except for an electrode portion of the stretchable wiring portion and a terminal portion of the lead-out wiring portion. cover,
The elastic wiring board according to the above (12).
(14) The stretchable wiring portion, the lead-out wiring portion, and the connection stretchable wiring portion are formed of a conductive material in which conductive particles are dispersed and blended in a resin material;
The resin material of the conductive material forming each of the elastic wiring portion, the lead wiring portion, and the connection elastic wiring portion is the same kind,
The stretchable wiring board according to any one of (9) to (13).
(15) forming a stretchable wiring portion on at least one main surface of the first stretchable base material;
A step of forming a lead wiring portion on one main surface of the reinforcing base material having a higher in-plane rigidity than the first elastic base material,
Forming a connection stretchable wiring portion on at least one main surface of the second stretchable base material,
The main surface of the second stretchable base material is superimposed on the main surface of the first stretchable base material and the main surface of the reinforcing base material on the side of the lead-out wiring section, An elastic wiring part and a part of the connection elastic wiring part are joined to each other, the lead wiring part and a part of the connection elastic wiring part are joined to each other, and the elastic wiring part and the extraction wiring part are connected to each other. A step of conducting through the connection elastic wiring portion,
A method for producing a stretchable wiring board, comprising:
(16) The first elastic substrate, the reinforcing substrate, and the second elastic substrate are heated or pressurized so that the main surface of the second elastic substrate is the first elastic substrate. The main surface of the stretchable base material and the main surface of the reinforcing base material are directly joined to each other, and part of the stretchable wiring portion and the connection stretchable wiring portion, and the extraction wiring portion and the connection stretchable portion. Fuse and integrate a part of the
The method for manufacturing a stretchable wiring board according to the above (15).
(17) a step of joining the main surface of the first stretchable base material and the main surface of the reinforcing base material opposite to the lead-out wiring portion;
The method for producing a stretchable wiring board according to the above (15) or (16), further comprising:

10, 10a, 10b Elastic base material 11, 11a, 11b Main surface 12 Edge 20 Elastic wiring part 21 Elastic wiring part 26 Electrode part 26a First electrode 26b Second electrode 28, 29 Wiring end part 30 Terminal part 40 Reinforcement region 42 Stretchable region 43 Intermediate region 50 Reinforcement base material 50a Band-shaped portion 50b Wide-width portion 50c Wide width portion 51, 52 Main surface 53 Edge 54 Lead-out wiring portions 56, 56a, 56b Joint portions 58, 59 Wiring end portion 60 Film Base material 64 Easy adhesion layer 70 Electrode exposed portion 72 Terminal exposed portion 90 Protective layer 92 Opening 94 Reinforcing member 96 Elastic auxiliary material 100, 200, 300, 400 Elastic wiring substrate 110 Separator

Claims (15)

A stretchable base material integrally formed of a stretchable material, a stretchable wiring portion formed on at least one main surface of the stretchable base material and having stretchability, and an in-plane position relative to the stretchable base material. Highly rigid reinforcing base material, comprising a lead wiring portion formed on at least one main surface of the reinforcing base material,
The main surface of the reinforcing base is overlapped with a part of a region where the elastic wiring portion is formed so as to face the main surface of the elastic substrate, and one of the elastic wiring portion and the lead-out wiring portion. The parts are joined and conducting with each other,
A terminal portion connected to the lead-out wiring portion is formed on the main surface of the reinforcing base material,
The stretchable base material extends in series with the stretchable material, covering at least a part of the lead-out wiring portion, to a position near the terminal portion or a position covering a part of the terminal portion. An elastic wiring board characterized by the above-mentioned. It further comprises a protective layer which is integrally formed of a stretchable material and covers a part of the stretchable wiring portion and a main surface of the reinforcing substrate opposite to the main surface,
The protective layer extends from a region of the elastic wiring portion that is not covered by the main surface of the reinforcing base material to a region that covers the lead-out wiring portion and the terminal portion on the opposite main surface of the reinforcing base material. The stretchable wiring board according to claim 1, which is formed.   The stretchable wiring board according to claim 1, wherein a separator is provided on a main surface of the stretchable base material opposite to the main surface so as to be peelable. The joining portion between the elastic wiring portion and the lead-out wiring portion is formed to be wider than the periphery.
The stretchable wiring board according to claim 1. A step of forming a stretchable wiring portion having stretchability on at least one main surface of a stretchable base material integrally formed of a stretchable material,
A step of forming a lead wiring portion on at least one main surface of the reinforcing base material having a higher in-plane rigidity than the elastic base material,
Forming a terminal portion on the main surface of the reinforcing base material,
The stretchable wiring portion and the lead-out wiring portion are formed by superimposing the main surface of the reinforcing base material on a part of a formation region of the stretchable wiring portion so as to face the main surface of the stretchable base material. A joining process of joining a part of
Including
In the joining step, the stretchable base material formed of a stretch of the stretchable material covers at least a part of the lead-out wiring portion and covers a vicinity of the terminal portion or a part of the terminal portion. The stretchable substrate and the reinforcing substrate are positioned so as to extend to a position,
A method for manufacturing an elastic wiring board. A protective layer integrally formed of a stretchable material, further comprising a protective layer forming step of forming a part of the main surface of the stretchable base material opposite to the main surface of the reinforcing base material,
In the protective layer forming step, the protective layer, from a region of the stretchable wiring portion that is not covered by the main surface of the reinforcing base, the lead-out wiring portion on the opposite main surface of the reinforcing base and Formed over a region covering the terminal portion,
A method for manufacturing a stretchable wiring board according to claim 5. One or both of the step of forming the stretchable wiring portion and the step of forming the lead-out wiring portion includes forming a wide portion at one end of the stretchable wiring portion or the lead-out wiring portion.
A method for manufacturing a stretchable wiring board according to claim 5. A first elastic substrate integrally formed of an elastic material,
An elastic wiring portion having elasticity formed on at least one main surface of the first elastic base material,
A reinforcing substrate having a higher in-plane rigidity than the first elastic substrate,
Lead-out wiring portion formed on at least one main surface of the reinforcing base material,
A second elastic substrate,
A connection elastic wiring portion having elasticity formed on at least one main surface of the second elastic base material,
With
The main surface of the second stretchable base material is overlapped facing the main surface of the first stretchable base material and the main surface of the reinforcing base material on the side of the lead-out wiring portion,
A part of the elastic wiring part and the connection elastic wiring part are joined to each other, and a part of the lead wiring part and the connection elastic wiring part are joined to each other, and the elastic wiring part and the extraction wiring part Are conductive through the connection elastic wiring portion,
A terminal portion connected to the lead-out wiring portion is formed on the main surface of the reinforcing base material,
The main surface of the reinforcing substrate opposite to the main surface and the main surface of the first elastic substrate are joined,
The first stretchable base material overlaps with a part of the connection stretchable wiring portion, and extends and contracts to a position overlapping with the lead-out wiring portion and the terminal portion on the opposite main surface side of the reinforcing base material. A stretchable wiring board characterized by being extended in a series with a conductive material. The main surface of the second elastic substrate is directly joined to the main surface of the first elastic substrate and the main surface of the reinforcing substrate, the first elastic substrate Covering at least a part of the main surface and at least a part of the main surface of the reinforcing substrate,
One end edge of the second stretchable base material extends to a position closer to an electrode portion provided in the stretchable wiring portion than a connection portion between the connection stretchable wiring portion and the stretchable wiring portion,
The other end edge of the second stretchable base material extends to a position closer to a terminal connected to the lead-out wiring portion than to a joint between the connection stretchable wiring portion and the lead-out wiring portion. ,
An elastic wiring board according to claim 8. The main surface of the second stretchable base material covers the entirety of the stretchable wiring portion and the lead-out wiring portion except for an electrode portion of the stretchable wiring portion and a terminal portion of the lead-out wiring portion,
The stretchable wiring board according to claim 9.   The stretchable wiring board according to any one of claims 8 to 10, wherein a separator is provided on a main surface of the second stretchable base material opposite to the main surface so as to be peelable. One or both of the elastic wiring portion or the connection elastic wiring portion is joined to the other at a wide portion formed wider than the surroundings,
One or both of the lead-out wiring portion or the connection stretchable wiring portion is joined to the other at a wide width portion formed wider than the periphery,
The stretchable wiring board according to any one of claims 8 to 11. Forming a stretchable wiring portion on at least one main surface of the first stretchable base material that is integrally formed of a stretchable material,
A step of forming a lead wiring portion on one main surface of the reinforcing base material having a higher in-plane rigidity than the first elastic base material,
Forming a terminal portion on the main surface of the reinforcing base material,
Forming a connection stretchable wiring portion on at least one main surface of the second stretchable base material,
The main surface of the second stretchable base material, the main surface of the first stretchable base material and the reinforcing base material and the main surface of the lead-out wiring portion side of the reinforcing base material are superimposed face-to-face, An elastic wiring part and a part of the connection elastic wiring part are joined to each other, the lead wiring part and a part of the connection elastic wiring part are joined to each other, and the elastic wiring part and the extraction wiring part are connected to each other. A bonding step of conducting through the connection elastic wiring portion,
Including
In the joining step, the main surface of the reinforcing base material opposite to the main surface and the main surface of the first stretchable base material are joined, and the second stretchable material is formed in series. One stretchable base material is overlapped with a part of the connection stretchable wiring portion, and extends to a position overlapping the lead-out wiring portion and the terminal portion on the opposite main surface side of the reinforcing base material. A method of manufacturing a stretchable wiring board on which the first stretchable base, the second stretchable base, and the reinforcing base are positioned. In the joining step, a position where one end edge of the second elastic substrate is closer to an electrode portion provided on the elastic wiring portion than a joint portion between the connection elastic wiring portion and the elastic wiring portion. Extending to a position closer to a terminal portion connected to the lead-out wiring portion than a joint portion between the connection stretchable wiring portion and the lead-out wiring portion. The second elastic substrate is positioned so as to extend,
The first stretchable substrate, the reinforcing substrate and the second stretchable substrate are heated or pressurized, and the main surface of the second stretchable substrate is subjected to the first stretchable group. The main surface of the material and the main surface of the reinforcing base material are directly joined to each other, a part of the stretchable wiring portion and the connection stretchable wiring portion, and the extraction wiring portion and the connection stretchable wiring portion. To integrate a part of
A method for manufacturing a stretchable wiring board according to claim 13. One or both of the step of forming the stretchable wiring portion and the step of forming the connection stretchable wiring portion may include forming a wide portion in the stretchable wiring portion or a part of the connection stretchable wiring portion. Including
One or both of the step of forming the lead-out wiring part and the step of forming the connection-stretchable wiring part includes forming a wide part in a part of the lead-out wiring part or the connection-stretchable wiring part,
A method for manufacturing a stretchable wiring board according to claim 13.

Images