JP2019204937A - Telescopic wiring member - Google Patents

Abstract

To simplify the conductive connection to a connection object.SOLUTION: A telescopic wiring member 11a includes a stretchable base material 20, a stretchable wiring 30 laminated on the base material 20, and a conductive connection portion 50 electrically connected to the stretchable wiring 30 and extending vertically from the stretchable wiring 30, in which the conductive connection portion 50 is made of a rubber-like conductive rubber composition having compressibility, and the base material 20 includes a conduction path shape holding unit 60 that reduces the diffusion of the pressure stress that presses the conduction connection portion 50 against a connection object in the horizontal direction at a position overlapping the conduction connection portion 50 in the vertical direction.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a stretchable wiring member that can be used by being stretched and stretched on a flexible base material.

  In recent years, the development of wearable devices such as smart watches, activity meters, and pulse meters equipped with sensors for measuring physical conditions such as pulse and body movements such as the number of steps has been active. In this wearable device, a unit in which a semiconductor element is arranged on a flexible substrate or a rigid rigid substrate is used and does not follow the movement of the body, so that a comfortable wearing feeling cannot be obtained. In view of this, a technique for obtaining a flexible wearable device that can be expanded and contracted by forming a conductive circuit on an elastic body or clothing has been developed.

  In the stretchable wiring member used for such a stretchable and flexible wearable device, the wiring that extends on the base material made of stretchable rubber or fabric is provided, while at the end that becomes the base end of the wiring, Various connection methods are employed for conducting conductive connection with the connection object. For example, in the invention described in JP-A-2006-145725 (Patent Document 1), a connection method in which a male hook and a female hook are combined is employed.

JP-A-2006-145725

  However, the connection method described in JP-A-2006-145725 (Patent Document 1) requires a dedicated hook, and is not necessarily a simple conductive connection method. Accordingly, the present invention has been made with the object of facilitating the connection between the expansion wiring member and the external connection object that is conductively connected to the expansion wiring member, and the expansion wiring member that can simplify the conductive connection to the connection target. The purpose is to provide.

  In order to achieve the above object, the stretchable wiring member of the present invention is configured as follows. That is, the present invention relates to a first connection that is electrically connected to an object to be connected with respect to a stretchable wiring member including a stretchable base material and a stretchable wiring that is disposed on the base material and expands and contracts by the expansion and contraction of the base material. An end, a second connection end that is conductively connected to the telescopic wiring, and a conduction path formed between the first connection end and the second connection end. A conductive connection portion that compressively deforms along the forming direction and that conductively connects the connection object and the stretchable wiring is provided.

  According to the various stretchable wiring members of the present invention, it is possible to satisfy various elements with the connection object such as easy connection, connection stability, convenience, reliability, and a feeling of wearing. Connection can be achieved.

  That is, the stretchable wiring member of the present invention includes a base material that can be stretched and a stretchable wiring that is disposed on the base material and expands and contracts by the expansion and contraction of the base material. can do. The stretchable wiring member includes a first connection end that is conductively connected to the connection target, a second connection end that is conductively connected to the stretchable wiring, and the first connection end and the second connection end. And a conductive connection part that compressively deforms along the direction of formation of the conductive path and conductively connects the connection object and the expansion and contraction wiring. Thus, the expansion and contraction wiring and the connection object can be conductively connected. Furthermore, since the conduction path is compressed and deformed along the direction in which the conduction path is formed, it is possible to easily conduct the expansion and contraction wiring and the connection object only by pressing the connection object and the conduction connection portion together.

  In addition, the base material has a conductive path shape holding portion that reduces the deformation of the conductive path that is compressed and deformed in the cross direction of the forming direction by being pulled by the base material extending in the extension direction of the stretchable wiring. Can be configured. The base material has a conductive path shape holding portion that reduces the deformation of the conductive path that is compressed and deformed in the crossing direction of the forming direction by being pulled by the base material extending in the extension direction of the stretchable wiring. It is possible to prevent the resistance value from increasing excessively when the elastic wiring member is extended.

  That is, in the course of the development of the present invention, the inventor provided the conductive connection portion on the expansion / contraction wiring, and extended the expansion / contraction wiring as compared with the case of conductive connection to the connection object without using the conductive connection portion. It has been found that sometimes the resistance value changes easily. The conductive connection portion is pressed when connected to the connection object, and the conductive path itself of the conductive connection portion acts so as to swell in the crossing direction with respect to the pressing direction, in other words, in the extending direction of the elastic wiring member. Therefore, when the expansion / contraction wiring member is extended to this action, the conduction path is extended in the extending direction of the expansion / contraction wiring member so as to be pulled by the extending base material. However, the conduction path shape holding part can prevent the conduction connection part from excessively extending in the extension direction. In other words, it is possible to reduce the diffusion of the pressure stress that presses the conductive connection portion against the connection object in the horizontal direction. Therefore, even when the stretchable wiring member is extended while the conductive connection portion is pressed against the connection object, an increase in the resistance value of the stretchable wiring member can be suppressed.

  The conduction path shape holding portion can be configured as being embedded in the base material. Since the conduction path shape holding part is buried in the base material, it is not necessary to separately protect the surface of the conduction path shape holding part and can be protected by the base material. Moreover, since the hard part of the conduction path shape holding portion is not exposed on the surface of the stretchable wiring member, the soft or warm feeling of the base material can be held.

  This invention can be comprised as the said conduction path shape holding | maintenance part being what is a metal foil or a resin film. Since the conduction path shape holding part is a metal foil or a resin film, the thickness of the stretchable wiring member can be reduced.

  The conduction path shape holding portion may be configured to be in a position overlapping the second connection end in the formation direction of the conduction path. Since the conduction path shape holding portion is located at a position overlapping the second connection end in the formation direction of the conduction path, it suppresses deformation of the conduction path that easily deforms in the extension direction as the telescopic wiring member extends. be able to.

  The conduction path shape holding portion can be configured to be in a position overlapping the conduction path in the expansion and contraction direction of the base material. The conductive path shape holding portion can suppress deformation of the conductive path that easily deforms in the extension direction along with the extension of the telescopic wiring member, even if the conductive path shape holding portion is located at a position overlapping the conductive path in the extension / contraction direction of the base material. . In addition, since the conduction path shape holding portion is provided at a position that overlaps the conduction path in the expansion and contraction direction of the base material, for example, the conduction path around the conduction path that does not overlap with the conduction path in the formation direction of the conduction path. A shape holding part can be provided. In this case, the stretchable wiring member can be made thinner than in the case where the conductive path shape holding portion is provided at a position overlapping the conductive path in the direction in which the conductive path is formed.

  The second connection end can be configured to be located inside the base material so as to be conductively connected to the telescopic wiring inside the base material. Since the second connection end is located inside the base material so as to be conductively connected to the extension wiring inside the base material, the second connection end is directly connected to the extension wiring located inside the base material. Can do. Therefore, the conductive connection between the conductive portion and the stretchable wiring can be made more reliable.

  The conductive connection portion can be configured as a conductive rubber composition in which a conductive filler is dispersed in a rubber-like polymer material. Since the conductive connection portion is a conductive rubber composition in which a conductive filler is dispersed in a rubber-like polymer material, the conductive connection portion can be pressed and connected to a connection object. Moreover, if it is the structure of this invention, manufacture is also easy.

  The base material can be configured to have an insulating covering portion surrounding the conduction path. Since the base material has an insulating covering portion that surrounds the conduction path, it is possible to prevent problems caused by contact of a conductive foreign object or the like with the side surface of the conduction connection portion during use.

  This invention can be comprised as what equips the circumference | surroundings of the said conduction | electrical_connection connection part with a waterproof rib. Since the waterproof rib is provided around the conductive connection portion, the stretchable wiring member can be made waterproof. Therefore, even when the elastic wiring member has water scattering, the influence of water can be suppressed, and its application can be expanded. Further, the waterproof rib can be configured to be provided on the conduction path shape holding portion. If the waterproof rib is configured to be provided on the conductive path shape holding portion, the conductive path shape holding portion can be pressed against a predetermined position of the connection object while suppressing deformation in the extending direction of the waterproof rib. Waterproofness can be improved.

  According to the stretchable wiring member of the present invention, the conductive connection with the connection object can be easily performed. Moreover, it is an expansion | extension wiring member which can suppress the deformation | transformation of the conduction | electrical_connection part accompanying expansion | extension, and can suppress the raise rate of resistance value.

It is a model top view of the expansion-contraction wiring member which is 1st Embodiment of this invention. It is the II-II sectional view taken on the line of the expansion-contraction wiring member of FIG. It is sectional drawing which shows another aspect of the conduction path of the expansion-contraction wiring member of FIG. 1, and FIG.3 (a) is sectional drawing which shows the one aspect, and FIG.3 (b) is sectional drawing which shows another aspect. It is. It is explanatory drawing explaining the one usage condition of the expansion-contraction wiring member of FIG. It is explanatory drawing explaining another usage condition of the expansion-contraction wiring member of FIG. It is explanatory drawing explaining the aspect of the connection target object which the expansion-contraction wiring member of FIG. 1 connects. It is explanatory drawing which shows another connection aspect with the connection target object of the expansion-contraction wiring member of FIG. It is explanatory drawing explaining the state of the conduction | electrical_connection connection part at the time of extending an expansion-contraction wiring member, FIG.7 (a) shows the conventional expansion-contraction wiring member and FIG.7 (b) shows the expansion-contraction wiring member of this invention. It is a partial expanded sectional view of the expansion-contraction wiring member of the modification 1-1 of this invention. It is a partial expanded sectional view of the expansion-contraction wiring member of the modification 1-2 of this invention. It is a partial expanded sectional view of the expansion-contraction wiring member of the modification 1-3 of this invention, Minute drawing 11 (a) is sectional drawing, and FIG. 11 (b) is a top view. It is a partial expanded sectional view of the expansion-contraction wiring member of 2nd Embodiment of this invention, and FIG.12 (a) is sectional drawing and FIG.12 (b) is a top view. It is a partial expanded sectional view of the expansion-contraction wiring member of the modified example 2-1 of this invention, and FIG.13 (a) is sectional drawing and FIG.13 (b) is a top view. It is a partial expanded sectional view of the expansion-contraction wiring member of 3rd Embodiment of this invention. It is a partial expanded sectional view of the expansion-contraction wiring member of 4th Embodiment of this invention. FIG. 16 is a partially enlarged cross-sectional view of a stretchable wiring member according to a fifth embodiment of the present invention, where FIG. 16 (a) is a cross-sectional view and FIG. 16 (b) is a plan view. FIG. 17 is a partially enlarged sectional view of a modified example of the present invention, and FIG. 17A is a partially enlarged sectional view of a modified example 5-1, and FIG. 17B is a partially enlarged sectional view of a modified example 5-2. FIG. It is a partial expanded sectional view of the expansion-contraction wiring member of another embodiment of this invention. It is a partially expanded sectional view of the expansion-contraction wiring member of another embodiment of this invention. It is a partial expanded sectional view of the expansion-contraction wiring member of another embodiment of this invention. It is a partial expanded sectional view of the expansion-contraction wiring member of another embodiment of this invention. FIGS. 20A and 20B are explanatory views for explaining a resistance value measuring method. FIG. 20A is a cross-sectional view of a test piece according to the present invention, and FIG. 20B is a plan view of the test piece. FIG. 20 and FIG. 20C are cross-sectional views corresponding to FIG. 20A with respect to the test piece of the comparative example.

  This will be described in more detail according to the embodiment. In addition, duplication description is abbreviate | omitted about the same material, a composition, a manufacturing method, an effect | action, an effect, etc. in each embodiment.

  First Embodiment [FIGS. 1 to 7]: The stretchable wiring member 11a of this embodiment will be described. FIG. 1 is a plan view of the stretchable wiring member 11a, and FIG. 2 is a sectional view thereof. The stretchable wiring member 11a includes a stretchable base material 20, a stretchable wiring 30 stacked on the base material 20, a conductive connection portion 50 electrically connected to the stretchable wiring 30, and a conductive path shape holding portion. 60. Next, each part which comprises the expansion-contraction wiring member 11a is demonstrated.

  <Base Material 20> The base material 20 is a portion serving as a base for holding the stretchable wiring 30 and is made of an insulating flexible material and has a property of being stretchable. Examples of the insulating flexible material include thermosetting rubber and thermoplastic elastomer, fiber sheets such as woven fabric and knit, and combinations thereof. As the base material 20, it is preferable to use a material that can be stretched to at least 120% of the initial length, and more preferably stretchable to a length of 150% or more.

  Among these materials, when a thermosetting rubber or a thermoplastic elastomer is used, the rubber hardness specified in JIS K6253 is preferably 90 or less (hereinafter referred to as A90) in terms of A hardness. This is because if the rubber hardness exceeds A90, the stress at the time of expansion becomes larger than necessary, and it becomes difficult to expand to a high elongation rate. A0-A70 is more preferable in terms of good stretchability, and A20-A50 is more preferable from the viewpoint of achieving both stretchability and handleability. However, when the E hardness is less than 20, the wear resistance and tensile rupture stress are low, which may cause concern in some applications.

  In the case of using a fiber sheet as the base material 20, fabrics (fabrics) such as woven fabrics, knitted fabrics, and nonwoven fabrics can be used, and it is preferable that fibers formed of twisted yarns obtained by twisting a plurality of single yarns are formed into a sheet shape. The kind of fiber used as the fiber sheet is not limited, and general natural fiber and synthetic fiber can be used, and inorganic fiber such as glass fiber can be used. For applications worn on the body, cotton, wool, rayon, nylon fiber, polyester fiber, polyurethane fiber, acrylic fiber, etc. that have insulating properties and have supple properties are preferred.

  The diameter of the twisted yarn constituting the sheet is preferably about 0.01 to 1.0 mm. In the case of knit, if the thickness is larger than 1.0 mm, the unevenness of the stitches that are generated becomes large and it becomes difficult to stack the stretchable wiring 30. Moreover, although it may be thinner than 0.01 mm, in the case of a knit, there is a concern that the wear resistance becomes weak and the durability of the elongated wiring member is lowered.

  <Extensible wiring 30> The elastic wiring 30 is arrange | positioned at the base material 20, and has the property to expand-contract by the expansion / contraction of this base material 20. As shown in FIG. By providing the conductive connection portions 50 on both sides of the base material 20, the end portions of the stretchable wiring 30 are electrically connected to the conductive connection portions 50, and even if the interval between the conductive connection portions 50 changes, both conductive connections It is a conductive part that maintains the state. Although the stretchable wiring 30 can be formed on the surface of the base material 20, it is preferable to embed it in the base material 20. This is to protect the stretchable wiring 30.

  The stretchable wiring 30 is made of a stretchable conductive material. Specific examples include flexible conductive resins in which conductive fillers such as silver filler are dispersed in thermosetting rubber or thermoplastic elastomer, conductive yarns, coiled metal wires, etc. Is preferably used. When a flexible conductive resin is used, when a thermosetting rubber or a thermoplastic elastomer is used as the substrate 20, the flexible conductive resin in which silver or carbon powder of the same kind of resin is dispersed is used for expansion and contraction. It is preferable to form the wiring 30. This is because the adhesion between the base material 20 and the stretchable wiring 30 is enhanced.

  Since both the stretchable wiring 30 and the base material 20 are formed of a flexible material, the hardness of both can be the same, but the hardness of the stretchable wiring 30 can be higher than the hardness of the base material 20. . When the stretchable wiring member 11a is configured with such a hardness relationship, even when the stretchable wiring member 11a is compressed, the base material 20 is easily compressed and deformed, but the stretchable wiring 30 is difficult to compressively deform. Therefore, since it is difficult to cause a volume change of the stretchable wiring 30 at the time of compression, it is possible to show a stable resistance value in applications where pressure is applied in a direction other than the extension direction.

  It is preferable that the fixing force between the stretchable wiring 30 and the base material 20 is larger than the tensile breaking force of the stretchable wiring 30. On the other hand, if the tensile breaking force of the stretchable wiring 30 is larger than the adhesive strength between the stretchable wiring 30 and the base material 20, the stretchable wiring member 11a is stretched from the base material 20 in a case where the stretchable wiring member 11a is greatly extended exceeding 200%. 30 may peel off. In this case, it is considered that the stretchable wiring 30 itself is greatly deformed in the reduced diameter direction, and stress is generated between the stretchable wiring 30 and the base material 20 so that peeling is likely to occur.

  In response to such a concern, by reducing the tensile breaking force of the stretchable wiring 30, it is possible to cause a partial crack in the stretchable wiring 30 before peeling. Such cracks are small cracks and the resistance value increases, but the cracks are less likely to become large as the stretchable wiring 30 is cut. Therefore, disconnection of the stretchable wiring 30 can be suppressed while suppressing peeling, and the limit of extension can be sensed by monitoring the increase in resistance value. The relationship between the fixing force and the tensile breaking force can be determined by performing an extension test on the stretchable wiring member 11a and determining whether or not a crack occurs before peeling. That is, when peeling before the crack is generated in the extension test, the tensile breaking force of the stretchable wiring 30 is larger than the fixing force between the stretchable wiring 30 and the base material 20. If this occurs, it can be determined that the adhesion force between the stretchable wiring 30 and the base material 20 is greater than the tensile breaking force of the stretchable wiring 30.

  <Conductive connection part 50> The conductive connection part 50 is a connector part for conducting conductive connection with a connection object such as the substrate P in the stretchable wiring member 11a. The first connection end 51a that is conductively connected to the connection object P and the second connection end 51b that is conductively connected to the stretchable wiring 30 are provided, and the first connection end 51a and the second connection end 51b The connection object P and the expansion / contraction wiring 30 are electrically connected through a conduction path 51 formed therebetween. The conductive connection portion 50 can be compressed and deformed along the direction in which the conductive path 51 is formed. Basically, the conductive connection part 50 is sandwiched and pressed between a connection object on one side, such as the substrate P, to which the elastic wiring member 11a is conductively connected, and the housing W or the like, and is held.

  The conductive connection portion 50 can be a conductive rubber composition in which a conductive filler is dispersed in a rubber-like polymer material. In such a conductive rubber composition, a composition in which a conductive filler is dispersed in a liquid polymer composition is oriented (or arranged) in a conduction direction in a magnetic field, and then a liquid polymer composition is formed. The thing which hardened the thing to solid can be illustrated. This conductive rubber composition has a conduction path 51 in which a conductive filler is continuous while being surrounded by an insulating coating 52 in which the polymer composition is cured. When the conduction path 51 is observed macroscopically, it seems that only the conductive filler exists, but when microscopically observed, the conductive filler is oriented inside the rubber-like elastic body. Even if the filling amount is small, the electrical resistance can be kept low, and the conduction path 51 itself can be provided with appropriate flexibility. The conductive rubber composition in which the conductive filler is dispersed in the rubber-like polymer material may be a conductive rubber in which the conductive filler is uniformly dispersed in the flexible polymer material in addition to such a mode.

  The rubber-like elastic body that fills the gap between the conductive fillers constituting the conduction path 51 is the same as the material constituting the covering portion 52. In addition, examples of the conductive filler include particulate, fibrous, strip-like, and fine-line metal particles. More specifically, nickel, cobalt, iron, ferrite, or an alloy containing a large amount thereof, good electrical gold, silver, platinum, aluminum, copper, iron, palladium, chromium, and other metals, and stainless steel, etc. For example, a powder or fine wire made of metal, resin, ceramic or the like is plated with a magnetic conductor, or conversely, a magnetic conductor is plated with a metal of a good conductor. As long as the average particle diameter is about 1 to 200 μm, the metal particles are preferably capable of forming a chain state along the direction of the magnetic field in a magnetic field that acts in the molding die. .

  The covering portion 52 covers the portion other than the exposed portion of the conduction path 51 that becomes a conductive contact, protects the periphery of the conduction path 51, and is integrated with the conduction path 51. The covering portion 52 is made of an insulating rubber-like elastic body, and the material is natural rubber, silicone rubber, isoprene rubber, butadiene rubber, acrylonitrile butadiene rubber, 1,2-polybutadiene, styrene-butadiene rubber, chloroprene rubber, nitrile. Rubber, Butyl rubber, Ethylene-propylene rubber, Chlorosulfone rubber, Polyethylene rubber, Acrylic rubber, Epichlorohydrin rubber, Fluoro rubber, Urethane rubber, Styrenic thermoplastic elastomer, Olefin thermoplastic elastomer, Ester thermoplastic elastomer, Urethane thermoplastic elastomer Amide-based thermoplastic elastomer, vinyl chloride thermoplastic elastomer, fluorinated resin thermoplastic elastomer, ion-crosslinked thermoplastic elastomer, and the like. Of these, silicone rubber having excellent electrical insulation and environmental characteristics is preferable. Further, when the conductive connection part 50 is manufactured by heat curing in a mold, it is preferably a thermosetting rubber, and more preferably silicone rubber or fluorine rubber having high heat resistance.

  The hardness of the covering portion 52 is preferably 5 to 70 in terms of A hardness according to JISK6253, and more preferably 15 to 50. When A hardness exceeds 25, the compression load at the time of compressing the conduction | electrical_connection connection part 50 will rise, and the load concerning the connection target P or the housing | casing W will become large. When the A hardness is less than 5.0, when the conductive connecting portion 50 is compressed, the conductive connecting portion 50 is liable to be crushed, easily buckled, and particles are easily separated from each other, so that stable conductivity may not be ensured. .

  Various methods can be used to manufacture the conductive connection portion 50. For example, a liquid polymer containing a conductive filler is injected into a molding die, and the conductive filler is oriented by magnetic poles arranged in the molding die to form a conductive path, and then the liquid polymer is cured. Thus, it is possible to obtain the conduction connecting portion 50 in which the conduction path 51 and the covering portion 52 are integrated. Alternatively, a conductive rubber having a predetermined electrical resistance may be molded in the shape of the conduction path 51 in advance.

  In order to incorporate the conductive connection part 50 into the base material 20, the conductive connection part 50 in which the conductive path 51 and the covering part 52 are integrated or the conductive connection part 50 made of conductive rubber is formed, and the base material 20 is formed. The base material 20 can be manufactured by inserting such a conductive connection part 50 into the metal mold of the mold, but in the case where the magnetic conductive filler is magnetically oriented in the liquid polymer. Can be manufactured such that the base material 20 becomes the covering portion 52 if the conduction path 51 is magnetically oriented in the mold forming the base material 20. Thus, when the material of the covering portion 52 is the same as that of the base material 20, a part of the base material 20 can be used as the covering portion 52.

  The stretchable wiring member 11 b shown in FIG. 3A is a stretchable wiring member having a modified form of the conductive connection portion 50, and the surface of the conductive connection portion 50 is substantially flush with the surface of the substrate 20. In addition, a part of the base material 20 also serves as the covering portion 52 of the conductive connection portion 50.

  The stretchable wiring member 11c shown in FIG. 3B is also a stretchable wiring member having a modified form of the conductive connection portion 50, and the surface of the conductive path 51 extends and contracts from the surface of the base material 20 in a dome shape. Wiring member. In the stretchable wiring member 11c as well as the stretchable wiring member 11b, the portion of the base material 20 that contacts the conduction path 51 in the vicinity of the periphery of the conduction path 51 forms the covering portion 52.

  <Conducting path shape holding part 60> The conducting path shape holding part 60 reduces that the compressed conducting path 51 is pulled by the base material 20 extending in the extending direction of the stretchable wiring 30 and deformed in the direction intersecting the conducting direction. It is a part to do. In other words, it is a part that reduces the diffusion of the pressure stress that presses the conductive connection portion 50 against the connection object P in the horizontal direction with respect to the pressure contact direction to the conductive connection portion 50, that is, the extension direction of the elastic wiring member. . In the stretchable wiring member 11a shown in FIG. 2, the conducting path shape holding portion 60 is provided at a position overlapping the second connecting end 51b in the conducting direction of the conducting path 51 (thickness direction of the stretchable wiring member 11a).

  The material forming the conduction path shape holding portion 60 may or may not have flexibility. Further, a member having a rigidity that does not substantially expand and contract in the in-plane direction can be used. Examples of the insulating hard material having such properties include a resin film such as a PET film, a hard resin molded body such as a hard resin substrate, a ceramic substrate, and a metal film. Alternatively, the base material 20 may have a hardness equal to or higher than that of the base material 20, and can be formed as a harder part than the base material 20 with a thermosetting rubber or a thermoplastic elastomer that can be used for the base material 20. . For example, this is a case where a part of the base material 20 is made to have a high hardness to form the conduction path shape holding unit 60.

  The resin film does not substantially expand and contract in the in-plane direction of the film and has a property of being easily deformed in the direction perpendicular to the film surface. On the other hand, a hard resin substrate or a ceramic substrate does not substantially expand and contract in the in-plane direction and hardly deforms in a direction perpendicular to the surface. Among these, it is a preferable aspect to use a polyimide film, a phenol resin, or an epoxy resin that is used as a substrate for printed wiring.

  As a method for fixing the base material 20 and the conduction path shape holding portion 60, a method using the adhesiveness of the material itself, a method using an adhesive, a method using thermal fusion, a fixing method using structural fixing, etc. are adopted. can do. A semi-cured thermosetting rubber can be exemplified as a material that can employ adhesiveness. In addition, examples of the material that can employ fixing by thermal fusion include thermoplastic elastomers and thermoplastic fabrics.

  FIG. 4 shows an example of a usage pattern of the stretchable wiring member 11a. It arrange | positions so that the conduction | electrical_connection connection part 50 of the expansion-contraction wiring member 11a may contact | abut to the contact S of the board | substrate P which is a connection object, and it presses with the housing | casing W etc. of the back surface 20b, and press-contacts the conduction | electrical_connection connection part 50 to a connection object. . FIG. 5 shows an example of another usage pattern. The difference from the usage pattern shown in FIG. 4 is that the stretchable wiring member 11a is wound around the connection target, and there is no member such as the casing W that is pressed from the back surface 20b. In addition, in the aspect shown in FIG. 5, it can also press-contact using the tension | tensile_strength etc. of expansion-contraction wiring member 11a itself. That is, both ends of the stretchable wiring member 11a can be pressed by tension that pulls upward in the drawing without winding.

  In FIG. 6, several aspects of the board | substrate P which is a connection target object of the expansion-contraction wiring member 11a are shown. As shown in the left side view of FIG. 6, when the contact S is built into the inside of the substrate P, or as shown in the right side view of FIG. 6, a part of the substrate P protrudes around the contact S. The aspect etc. to protect can be illustrated. Not only in such an aspect, it forms so that the conduction path 51 of the expansion | extension wiring member 11a and the contact S of the connection target P may contact | abut.

  The stretchable wiring member 11a or the connection target P is provided with the fixture 70 as shown in FIG. 7 so that the expansion / contraction wiring member 11a and the connection target P are appropriately in contact with each other and stably held. it can. The fixture 70 in this example is made of a hard resin and is provided on the stretchable wiring member 11a. When the stretchable wiring member 11a and the substrate P are in contact with each other, the fixture 70 is provided through the base material 20. The hook 71 of the fixing tool 70 is hooked on the surface of the substrate P through the through hole H.

  In order to manufacture the stretchable wiring member 11a, a member having a size half that of the substrate 20 is prepared, the stretchable wiring 30 is formed on the surface thereof by screen printing or the like, and the conductive connection portion 50 is fixed. There is a method in which another half of the size of the base material 20 is bonded to the surface of the base material 20 on which is formed. In this method, the conductive connecting portion 50 can be integrated with the half-sized base material 20 by insert molding.

  According to the stretchable wiring member 11a of the present invention, it is possible to suppress the extension in the horizontal direction in the vicinity of the conductive connection portion 50 and to prevent the pressure contact stress from spreading in the horizontal direction. This effect will be described in comparison with the case of the stretchable wiring member R without the conduction path shape holding portion 60 with reference to the drawings. FIG. 8A shows a state in which the conductive connection portion 50 of the elastic wiring member R is pressed and the elastic wiring member R is pulled for the elastic wiring member R that does not have the conductive path shape holding portion 60. FIG. When the stretchable wiring member R is pulled while pressing the conductive connecting portion 50, the conductive connecting portion 50 is deformed to expand in the horizontal direction with respect to the pressing direction, as shown in FIG.

  On the other hand, FIG. 8B shows a state in which the stretchable wiring member 11a is pulled while pressing the conduction connecting portion 50. In the stretchable wiring member 11a, as shown in this figure, the deformation of the conductive connection portion 50 in the horizontal direction can be suppressed. Such a difference is considered to be due to the presence or absence of the conduction path shape holding portion 50. As described above, the conductive connection portion 50 is arranged in the conductive direction of the conductive connection portion 50 by disposing the conductive path shape holding portion 60 at a position overlapping the conductive connection portion 50, that is, at a position where the conductive connection portion 50 is pressed. The extension in the horizontal direction of the portion to be pressed is suppressed, and the pressure stress is prevented from spreading in the horizontal direction. By such an action, even in the conductive connection portion 50 made of a rubber-like conductive rubber composition, excessive deformation in the horizontal direction of the portion where the conductive connection portion 50 is pressed is prevented, and the resistance value is excessively increased. Can be suppressed.

  Modification 1-1 [FIG. 9]: FIG. 9 shows an expandable wiring member 11d of Modification 1-1. The extension wiring member 11d is different from the extension wiring member 11a shown in the previous embodiment in the arrangement position of the conduction path shape holding portion 60. In the stretchable wiring member 11 d, the conduction path shape holding portion 60 is provided inside the base material 20 at a substantially intermediate position. As shown in the present embodiment, the conduction path shape holding unit 60 can be disposed so as to be embedded in the base material 20. Since the conduction path shape holding part 60 is embedded in the base material 20, the integration with the base material 20 can be strengthened rather than providing the conduction path shape holding part 60 on the surface of the base material 20, and the conduction path shape holding is performed. The part 60 can be provided stably.

  Modified Example 1-2 [FIG. 10]: FIG. 10 shows an expandable wiring member 11e of Modified Example 1-2. The extension wiring member 11e of FIG. 10 is also different from the extension wiring member 11d shown in FIG. 9 in the arrangement position of the conduction path shape holding part 60. However, in the extension wiring member 11e, the conduction path shape holding part 60 is connected to the extension wiring 30. It is provided at a position where it touches. In the stretchable wiring member 11e of the present embodiment, since the conduction path shape holding part 60 contacts the conduction path 51, if a conductive material is used for the conduction path shape holding part 60, a plurality of conduction paths 51 are conducted. Will do. Therefore, when there are a plurality of conduction paths 51, the conduction path shape holding portion 60 is made of an insulating material. In addition, when the conduction path 51 is monopolar, a conductor such as a metal film may be used.

  If the position of the conduction path shape holding portion 60 is too close to the stretchable wiring 30, the possibility that the stretchable wiring 30 is disconnected at the end of the conduction path shape holding portion 60 that intersects the stretchable wiring 30 increases. On the other hand, the closer to the stretchable wiring 30, the greater the effect of reducing the horizontal stress applied to the stretchable wiring 30 and the conductive connection portion 50 when the stretchable wiring member is pressed. Therefore, the position of the conduction path shape holding portion 60 in the thickness direction of the stretchable wiring member is preferably disposed at an appropriate position in consideration of both the prevention of breakage of the stretchable wiring 30 and the horizontal stress reduction, A position near the stretchable wiring member 11e that does not contact the stretchable wiring member 11e is one of the preferred embodiments.

  Modification 1-3 [FIG. 11]: FIG. 11 shows an expandable wiring member 11f of Modification 1-3. The extension wiring member 11f is the same as the extension wiring members 11d and 11e in that the arrangement position of the conduction path shape holding portion 60 is different from the extension wiring member 11a of the first embodiment. However, the extension wiring member 11f has the conduction path shape holding portion 60. Is provided on the surface 20 a of the substrate 20. Moreover, the shape is provided in the ring shape so that the conduction | electrical_connection connection part 50 may be enclosed. In the stretchable wiring member f, although it is a position that does not overlap the second connection end 51b in the conduction direction of the conduction path 51 (thickness direction of the stretchable wiring member 11a), it is at a position that overlaps the conduction path 52 in the stretching direction of the base member 20. A conduction path shape holding unit 60 is provided. Even if the conduction path shape holding portion 60 is provided at such a position, the effect of preventing the pressure stress from diffusing in the horizontal direction is exhibited as in the case of the stretchable wiring members 11a to 11e described so far. In addition, in the stretchable wiring member 11f, since the conduction path shape holding portion 60 can be disposed on the upper surface side close to the conduction connecting portion 50, the thickness of the stretchable wiring member can be reduced, and the horizontal direction applied to the conduction connecting portion 50 Can be further reduced.

  In the above example, the ring-shaped conduction path shape holding member 60 is provided at a position overlapping the conduction path 52 in the expansion / contraction direction of the base material 20, but in the expansion / contraction direction of the base material 20 when there is no restriction such as thickness. It can also be provided at a position that does not overlap with the conduction path 52.

  Second Embodiment [FIG. 12]: In the stretchable wiring member 12a of the present embodiment, the number of the stretchable wiring 30 is one, and the stretchable wiring members 11a to 11f described so far have two stretchable wires 30. It was different from what I was doing. Further, in the stretchable wiring member 12a of the present embodiment, a conductive conductive path shape holding unit 60 such as a metal foil such as a copper foil or a metal plate is used. By using the conductive conduction path shape holding part 60, the conductive connection part 50 is disposed in an electrically connected state on the upper surface of the conduction path shape holding part 60, and the expansion / contraction wiring 30 is provided on the lower surface of the conduction connection part 50. It can be set as the aspect to arrange. In this aspect, the second connection end 51b of the conductive connection portion 50 is conductively connected to the stretchable wiring 30 via the conductive path shape holding portion 60, and the second connection end of the conductive path 51 as in this embodiment. There is a case where 51b is indirectly connected to the expandable wiring 30 indirectly.

  In addition, the shape of the conduction path shape holding portion 60 in the stretchable wiring member 12 a is provided with protrusions 61 protruding in the extending direction in plan view at both ends of the conduction path shape holding portion 60. By having the protrusions 61, it is possible to suppress the extension of the base material 20 in the recesses surrounded by the protrusions 61, 61 at both ends, and it is possible to make the stretchable wiring 30 arranged in the recesses difficult to cut. .

  Modification 2-1 [FIG. 13]: FIG. 13 shows an expandable wiring member 12b of Modification 2-1. The stretchable wiring member 12b is an example in which a metal foil such as a copper foil or a conductive member 60 such as a metal plate is bonded to the back surface of the conductive connection portion 50 and is connected to the stretchable wiring 30 and is easy to manufacture. It is. That is, it can be manufactured by preparing a conductive connection portion 50 previously provided with a copper foil or the like and bonding it to the base material 20 provided with the stretchable wiring 30. In the present embodiment, the conductive member such as the copper foil is the conduction path shape holding portion 60.

  Third Embodiment [FIG. 14]: FIG. 14 shows an expandable wiring member 13a of a third embodiment. In the stretchable wiring member 13a, the conductive path shape holding portion 60 provided inside the base material 20 is extended to the outside of the base material 20, and the conductive connection portion 50 is provided on the extended conductive path shape holding portion 60. It is. From another point of view, the conductive connection portion 50 is provided at the contact point for connection of the FPC-integrated connection structure. The advantage of this structure is that the stress does not affect the stretchable wiring 30 at all when the conductive connection portion 50 is pressed. In the present embodiment, the fixed wiring 31 is provided for the conductive connection between the conductive connection portion 50 and the stretchable wiring 30. The fixed wiring 31 can be formed of the same material as the stretchable wiring 30, but can also be formed of a material that does not include a component that stretches and contracts because it does not stretch.

  In addition, as a method of manufacturing the stretchable wiring member 13a, after the conductive connection portion 50 is integrally formed with the conductive path shape holding portion 60 made of FPC, it is integrated with the base material 20, or the base material 20 and the conductive path are preliminarily formed. A method of fixing the conductive connecting portion 50 including the shape holding portion 60 on the back surface with the conductive member such as the copper foil used in the modified example 2-1 to the fixed wiring 31 with solder or a conductive adhesive. Can be adopted. In addition, in the latter example using the conductive connection part 50 provided with a conductive member such as a copper foil used in the modified example 2-1, the conductive path shape holding part 60 extending from the inside of the base material 20 to the outside. And a conductive member such as a copper foil together form a conduction path shape holding portion 60.

  Fourth Embodiment [FIG. 15]: FIG. 15 shows an expandable wiring member 14a of a fourth embodiment. The stretchable wiring member 14a of the present embodiment is an example in which a fabric is used for the base material 20. It can be manufactured by integrally forming the conductive connection portion 50 on the upper surface of the fabric and integrally forming the conductive path shape holding portion 60 on the lower surface.

  Fifth Embodiment [FIG. 16]: FIG. 16 shows a stretchable wiring member 15a of a fifth embodiment. The stretchable wiring member 15a of the present embodiment is characterized in that the waterproof rib 80 is provided, and corresponds to the configuration in which the waterproof rib 80 is provided on the stretchable wiring member 11a described in the first embodiment. The waterproof rib 80 is located between the base material 20 and the connection target P, isolates the conduction path 51 when pressed against the connection target P by pressing the stretchable wiring member 15a, and is guided from the outside of the waterproof rib 80. This is a part for preventing water from entering the passage 51.

  The waterproof rib 80 is made of a rubber-like elastic body that is softer than general rubber. In the stretchable wiring member 15a of the present embodiment, the waterproof rib 80 is located around the conductive connection portion 50 and is endless in plan view from the surface 20a of the base member 20. It is a projection provided projecting in an annular shape. Since the structure such as the waterproof rib 80 is also provided on the base material 20 that extends, the structure is easily deformed when the stretchable wiring member is stretched. The deformation of the waterproof rib 80 occurs in the horizontal direction of the waterproof rib 80 due to the extension of the stretchable wiring member. Therefore, the waterproof rib 80 acts to reduce the thickness of the waterproof rib 80 in the thickness direction, or the waterproof rib 80 connection object P There is a possibility that the waterproof property may be reduced by acting so that the contact surface with the lens is displaced. However, in the stretchable wiring member 15a, since the waterproof rib 80 is provided at a position overlapping the conduction path shape holding portion 60 in a plan view, horizontal deformation of the waterproof rib 80 is also suppressed, so that high waterproofness is maintained. can do.

  Modification 5-1 and Modification 5-2 [FIGS. 17A, 17B]: FIG. 17A shows an expandable wiring member 15b of Modification 5-1. This stretchable wiring member 15b has a configuration in which a waterproof rib 80 is added to the stretchable wiring member 11f shown in FIG. FIG. 17B shows the stretchable wiring member 15c of Modification 5-2. This stretchable wiring member 15c has a configuration in which waterproof ribs 80 are added to the stretchable wiring member 13a shown in FIG. Like the stretchable wiring members 15b and 15c shown in these embodiments, the representative configuration of the other embodiments is changed to add the waterproof rib 80 and provide the conduction path shape holding portion 60 at the corresponding position. be able to. However, for the stretchable wiring member 14a shown in FIG. 15 using a fabric as the base material 20, in order to form a significant waterproof rib 80, it is necessary to take into account the intrusion of water through the fabric. Examples include a method in which a waterproof layer made of silicone rubber or the like is provided around the stretchable wiring 30 and the conductive connection portion 50, and then the stretchable wiring 30 and the conductive connection portion 50 provided with this waterproof layer are built in the fabric.

  The above-described embodiment is an exemplification of the present invention, and modifications of the embodiment, addition of known techniques, combinations, and the like can be made without departing from the spirit of the present invention, and these techniques are also within the scope of the present invention. Is included.

  For example, the shape of the conduction path shape holding portion 60 is not limited to a rectangular shape, but may have various sizes and shapes depending on the installation location of the stretchable wiring member, the size and shape of the connection object P and the housing W, and the like. Can be changed. Like the shape already shown in FIG. 12B and FIG. 13B and the conductive path shape holding portion 60 in the stretchable wiring member 16a shown in FIG. A protruding portion 61 that protrudes may be formed. By having the protruding portion 61, it is difficult to cause the inconvenience that the stretchable wiring 30 is easily cut in the vicinity of the outside from the boundary with the position overlapping the conduction path shape holding portion 60 in plan view.

  Alternatively, the shape of the waterproof rib 80 is not limited to the one protruding upward from the surface 20a of the base member 20, and for example, a conductive connecting portion like the waterproof rib 80 in the stretchable wiring member 16b shown in FIG. It can also be configured to project from 50 in the radial direction. This is effective when the connection object P is provided with a recess corresponding to the conductive connection portion 50.

  In addition, the conductive connection portion 50 can be provided not only on one side of the substrate 20 but also on many sides. For example, in the stretchable wiring member 16c shown in FIG. 20, the conductive connection portion 50 is provided not only on the front surface 20a of the base member 20 but also on the back surface 20b. That is, in the expansion / contraction wiring member 16c, the first connection end 51a that is conductively connected to the connection object P, the second connection end 51b that is conductively connected to the expansion / contraction line 30, and the connection ends 51a and 51b. Conductive connection portions 50 having formed conductive paths 51 are provided on both front and back surfaces of the stretchable wiring 30 in the thickness direction of the stretchable wiring member 11g. In this embodiment, the conduction path shape holding portion 60 has a ring shape surrounding the conduction connection portion 50.

  Alternatively, as another aspect of the expansion / contraction wiring member 16c, for example, in the expansion / contraction wiring member 16d shown in FIG. 21, not only the expansion / contraction wiring 30 but also the conductive conduction path shape holding portion between the two conduction connection portions 50. 60 is provided.

Although the use form which contact | connects the connection part 50 of the expansion-contraction wiring member 11a to the connection target object P was demonstrated using FIG. 4, the expansion-contraction wiring member of this invention is not limited to the expansion wiring member 11a, but the connection target object P is used. It is also possible to fix the end of the conductive connection portion 50 on the side to be in contact with the connection object P with a conductive adhesive or solder. In the case of fixing with solder, by preparing a material in which a conductive member made of copper foil or a metal plate is bonded to the end portion of the conductive connection portion 50, this conductive member is connected to the connection object P. The contact S can be fixed by soldering and soldered.
If the expansion / contraction wiring member 11a is connected to the connection object P in such a form, the conductive connection is ensured. Moreover, in addition to being able to suppress an excessive increase in the resistance value by preventing excessive deformation in the horizontal direction at the place where the conductive connection portion 50 is pressed, the conductive connection portion 50 and the conductive member and the contact S are peeled off. Can be suppressed.

  <Resistance Value Test>: A test piece (T1) of the stretchable wiring member having the shape shown in FIG. 22 was produced, and the resistance value when the test piece was extended was measured. The base material (20) formed of silicone rubber having a rubber hardness of A30 has a width of 20 mm, a length of 50 mm, and a thickness of 0.5 mm. The stretchable wiring (30) provided therein has a width of 3 mm. 1.0 mm, 25 mm in length, 0.07 mm in thickness, the conductive path (51) has a diameter of 1.0 mm, a length of 1 mm, and stretchable wiring (30) from the surface of the base material (20). The size is connected to the surface.

  In addition, the conductive path shape holding portion (60) made of polyethylene terephthalate having the same width as the base material (20), the length of 10 mm, and the thickness of 0.1 mm is replaced with the base material (20 ) Adhered to the back surface (20b). In addition, the end opposite to one end of the base material (20) provided with the conduction path (51) overlaps with the stretchable wiring (30) with a length of 5.0 mm and a copper foil with a length of 10 mm. A measuring terminal (E) made of a polyimide film laminated with (Cu) was provided. The conduction path (51) in the test piece (T) is obtained by magnetically orienting magnetic conductive particles in a mold for manufacturing the base material (20), and a part of the base material (20) is covered. The conductive connection part (50) composed of the conduction path (51) and the covering part (52) is integrated with the base material (20) and incorporated into the base material (20). Yes.

  The resistance value is measured by pressing the surface of the conductive path (51) that is flush with the surface of the base material (20) with a measuring pusher (A) with a load of 0.2 N, and a copper foil (Cu). Was measured with a digital multimeter (“73101” manufactured by Yokogawa Electric Corporation). The resistance value was measured for the natural length (0%) and when the base material (20) was stretched by 20%, 40%, 60%, 80%, and 100% with respect to the natural length. And the increase rate of the resistance value at the time of expansion | extension with respect to the resistance value (initial resistance value) in natural length was calculated | required in percentage (%), and it described in the "resistance value increase rate (%)" column of Table 1. In addition, for comparison, a test piece (T2) of a comparative example different from the above-described test piece (T1) of the present invention in that the conduction path shape holding portion (60) is not provided, and a similar resistance value test is performed. went. The results are also shown in Table 1. In Table 1, the hatched portions indicate that the resistance value is too high and is outside the measurement limit.

  As is apparent from the results shown in Table 1, when the conduction path shape holding portion is provided, it is possible to keep the increase in the resistance value low even by stretching the stretchable wiring member. The rate of increase in resistance value could be suppressed to 500% or less.

11a-11f Telescopic wiring member (first embodiment)
12a, 12b Telescopic wiring member (second embodiment)
13a Telescopic wiring member (third embodiment)
14a Telescopic wiring member (fourth embodiment)
15a-15c Telescopic wiring member (fifth embodiment)
16a-16d Telescopic wiring member (other embodiment)
DESCRIPTION OF SYMBOLS 20 Base material 20a Surface 20b Back surface 30 Telescopic wiring 31 Fixed wiring 50 Conductive connection part 51 Conductive path 51a First connection end 51b Second connection end 52 Covering part 60 Conductive path shape holding part 61 Protrusion part 70 Fixing tool 71 Hook 80 Waterproof rib A Measuring pusher E Measuring terminal (copper foil)
H Through hole P Substrate (object to be connected)
R Stretchable wiring member (comparative example)
S contact T1, T2 Test piece W Case

Claims (10)

A stretchable substrate;
In the expansion / contraction wiring member provided with the expansion / contraction wiring disposed on the base material and expanding / contracting by expansion / contraction of the base material
A first connection end that is conductively connected to the connection object, a second connection end that is conductively connected to the stretchable wiring, and a conduction path that is formed between the first connection end and the second connection end. A stretchable wiring member comprising: a conductive connection portion that compressively deforms along a direction in which the conductive path is formed and that electrically connects the connection object and the stretchable wiring.
The said base material has a conduction path shape holding | maintenance part which reduces that the said conduction path compressed and deformed is pulled by the said base material extended in the expansion | extension direction of the said expansion-contraction wiring, and deform | transforms in the cross direction of the said formation direction. The expansion | extension wiring member of claim | item 1.
The stretchable wiring member according to claim 2, wherein the conduction path shape holding portion is buried in the base material.
The stretchable wiring member according to claim 2 or 3, wherein the conduction path shape holding portion is a metal foil or a resin film.
The stretchable wiring member according to any one of claims 2 to 4, wherein the conduction path shape holding portion is located at a position overlapping the second connection end in the formation direction of the conduction path.
The stretchable wiring member according to any one of claims 2 to 4, wherein the conduction path shape holding portion is located at a position overlapping the conduction path in the expansion and contraction direction of the base material.
The stretchable wiring member according to any one of claims 1 to 6, wherein the second connection end is located inside the base material so as to be conductively connected to the stretchable wiring inside the base material.
The stretchable wiring member according to any one of claims 1 to 7, wherein the conductive connecting portion is a conductive rubber composition in which a conductive filler is dispersed in a rubber-like polymer material.
The stretchable wiring member according to claim 1, wherein the base material has an insulating covering portion surrounding the conduction path.
The expansion-contraction wiring member of any one of Claims 1-9 provided with a waterproof rib around the said conduction | electrical_connection connection part.

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