JP2020007660A - Electrode connection structure of conductive knitted fabric and method of connecting electrode of conductive knitted fabric - Google Patents

Abstract

To provide an electrode connection structure of a conductive knitted fabric for electrically connecting a conductive knitted fabric to an external electrode terminal with sufficient adhesion strength.SOLUTION: The electrode connection structure of a conductive knitted fabric is constituted by electrically connecting a conductive knitted fabric 3 formed with a conductive belt-like part 2 by a metal yarn knitted into a ground structure 1 obtained by knitting an insulation yarn 1a, or a conductive yarn 2a composed of a metal film yarn to an external electrode terminal 5. The conductive belt-like part 2 is composed of a plated knit part obtained by plating the conductive yarn 2a along the insulation yarn 1a, and is provided with a heat compression bonded part 4 heat compression bonded to the external electrode terminal 5 through a resin adhesive sheet 8 at a connection region to the external electrode terminal 5 of the plated knit part. A conductive wire exposure knitted part exposed with the conductive yarn 2a is formed at least at the connection region CA on at least a part of exposed surface of the ground structure of the plated knit part.SELECTED DRAWING: Figure 2

Description

  The present invention electrically connects an external electrode terminal to a conductive knitted fabric having a conductive band formed by a conductive yarn composed of a metal yarn or a metal film yarn knitted in a ground structure knitted by an insulating yarn. The present invention relates to a conductive knitted fabric electrode connection structure and a conductive knitted fabric electrode connection method.

  In recent years, conductive knitted fabrics in which conductive strips are formed by conductive yarns composed of metal yarns or metal film yarns woven into a ground structure knitted with insulating yarns have attracted attention as multiple applications such as nursing care and wearable devices Have been.

  Patent Literature 1 discloses an electrode that can be easily arranged at a predetermined position on the body surface when worn, and that can be used for low-frequency treatment and acquisition of bioelectric signals while well following the expansion and contraction effect when the body is attached and detached. Elastic garments have been proposed.

  At least at least the region of the elastic fabric that allows the generation of the contact pressure freely through the elastic fiber, the amount of expression on the back side that comes into contact with the body surface at the time of wearing is increased and knitted. A planar conductive layer is formed from conductive fibers, connection terminals are provided at appropriate positions on the surface of the planar conductive layer to form electrodes, and the electrodes are used as stimulation electrodes for low-frequency treatment or bioelectric signals. Is configured to be used as a recording electrode for obtaining

  Patent Document 2 discloses a knitted fabric including at least one yarn of a certain material, the electrical characteristics of which change due to the influence of humidity, and at least two conductive electrodes arranged at intervals. A built-in humidity sensor having: a stitch row or column of the knitted fabric between the conductive electrodes, each of the conductive electrodes having at least one conductive A knitted fabric including a yarn, wherein the conductive yarn is knitted into the knitted fabric and electrically connected to an externally accessible electric connection means has been proposed.

  Patent Literature 3 discloses that a plurality of loops are formed by connecting conductive yarns, and the loops are entangled with each other and knitted to form a single piece of cloth and an electrode thread. Wherein the conductive yarn is constituted by a core wire made of a fiber, and a conductive layer or a conductive foil covering the surface of the core wire. Has been proposed.

  Patent Literature 4 discloses a conductive material in which a conductive adherend is stacked and fixed with the object of providing a conductive material capable of suppressing deterioration of a conductor at a connection point with a connection terminal in an external device. A fabric, which is constituted by a conductive fibrous structure, and a conductive portion electrically connectable to the adherend, and is impregnated in at least a part of a region where the conductive portion is provided; There has been proposed a conductive cloth including a resin adhesive which is connected and fixed in a state of being directly in contact with the conductive portion.

JP 2005-349021 A JP 2011-106084 A JP 2014-157824 A JP 2017-66536 A

  Patent Documents 1 to 4 propose various modes as a conductive knitted fabric having a conductive portion in which a conductive yarn is woven into a knitted fabric. However, as the connection structure between the conductive cloth and the external device, there is a structure in which the conductive portion is connected to the connection terminal in the external device via a conductive adhesive, or the connection terminal in the external device is formed in a clip shape to form a conductive structure. Only a structure in which the conductive portions of the fabric are connected to each other is adopted, and there is room for further improvement in terms of an appropriate electrode connection structure having durability.

  Patent Document 4 discloses, as an example, an electrode connection structure of a conductive knitted fabric in which a conductive adherend and a conductive cloth are joined via a resin adhesive.

  However, a conductive knitted fabric in which a conductive band is formed by a conductive yarn composed of a metal yarn or a metal film yarn knitted in a ground structure knitted with an insulating yarn and an external electrode terminal are connected via a resin adhesive. In the case of joining by means of a resin, there is a problem that it is difficult to sufficiently impregnate the conductive thread constituting the conductive strip with the resin adhesive, so that the adhesive strength is weak and the durability cannot be secured.

  An object of the present invention is to provide a conductive knitted fabric electrode connection structure and a conductive knitted fabric electrode connection method for electrically connecting a conductive knitted fabric and an external electrode terminal with sufficient adhesive strength in view of the above-described problems. The point is to provide.

  In order to achieve the above-mentioned object, a first characteristic configuration of the electrode connection structure of the conductive knitted fabric according to the present invention is as described in claim 1, wherein a metal yarn knitted in a ground structure knitted by an insulating yarn or An electrode connection structure of a conductive knitted fabric for electrically connecting a conductive knitted fabric having a conductive band formed by a conductive yarn composed of a metal film thread and an external electrode terminal, wherein the conductive band-shaped portion is The insulating yarn is formed of a spun knitted portion in which the conductive yarn is spun into the insulating yarn, and the external electrode terminal is connected to the external electrode terminal via a resin adhesive sheet in a connection area of the spun knitted portion with the external electrode terminal. A heat-compression-bonded heat-compression part, and a conductive yarn-exposed knitting part that exposes the conductive yarn on at least a part of the surface of the ground texture of the additional yarn knitting part in the connection region is formed. It is in.

  When the conductive strip portion in which the conductive yarn is added to the insulating yarn and the external electrode terminal are thermocompression-bonded in the connection region via a resin adhesive sheet, a table showing the ground structure of the additional yarn portion in the connection region. When the conductive yarn exposing knitting part in which the conductive yarn is exposed is formed on at least a part of the output surface, the molten resin infiltrates into the insulating yarn constituting the ground structure exposed near the conductive yarn. A large anchor effect occurs, and the ground tissue and the external electrode terminal are bonded with sufficient strength in a state where the conductive yarn and the external electrode terminal are electrically connected.

  The second characteristic configuration is, as described in the second aspect, in addition to the first characteristic configuration described above, wherein the thermocompression bonding portion is the conductive yarn out of the conductive yarn expression knitting portion formed in the connection region. The point is that it is thermocompression-bonded to the external electrode terminal via the resin adhesive sheet on the exposed side of the yarn.

  On the non-exposed side of the conductive yarn in the conductive yarn exposed knitting portion formed in the connection area, the resin melted at the knitted portion is hindered by the conductive yarn, and the resin applied to the ground structure knitted with the insulating yarn Is inhibited. However, as in the above configuration, for example, in the region where the conductive yarn is missed and exposed on the exposed side of the conductive yarn, the resin infiltrates the ground structure knitted by the insulating yarn through the gap between the conductive yarns. Anchor effect works.

  The third characteristic configuration is, as described in the fourth aspect, in addition to the first or second characteristic configuration described above, wherein the conductive yarn expression knitting portion is configured such that the conductive yarn is float knitted or jacquard knitted. Or the floating yarn knitting part knitted by any one of the above.

  As the conductive yarn exposing knitting unit, a floating yarn knitting unit in which conductive yarns are knitted by either float knitting or jacquard knitting can be suitably used.

  The fourth characteristic configuration is, as described in the fourth aspect, in addition to the above-described first to third characteristic configurations, a substrate extending along the width direction of the conductive strip portion. A plurality of the external electrode terminals are arranged at intervals smaller than the width of the conductive strip portion, and a plurality of the external electrode terminals are thermocompression-bonded to the conductive strip portion.

  The ground tissue and the electrode are bonded with the resin while the external electrode terminal is in electrical contact with the conductive yarn, and the ground tissue and the base material exposed between the electrodes are bonded with the resin. If the electrode is covered with gold, etc., even if the coating part gold may be partially peeled off from the copper pattern, it is sufficiently adhered to the base material, This can avoid poor conduction between the electrode and the conductive yarn.

  The fifth characteristic configuration is, as described in claim 5, in addition to the above-described first to fourth characteristic configurations, the insulating yarn is a natural fiber yarn, a recycled fiber yarn or a synthetic fiber yarn. It is a mixed yarn with an elastic yarn.

  Since it has elasticity, it can be attached so as to be in close contact with the surface even in a uneven portion such as clothing.

  The sixth characteristic configuration is, as described in claim 6, in addition to the above-mentioned first to fifth characteristic configurations, the resin-made adhesive sheet has fine metal particles dispersed in a thermosetting resin. In that it is an anisotropic conductive film.

  The electrodes and the conductive yarn can be reliably electrically connected.

  According to a seventh feature of the present invention, as set forth in claim 7, in addition to any one of the first to fifth features described above, the resin adhesive sheet is a thermoplastic resin sheet.

  The electrode and the ground tissue can be firmly bonded in a state where the electrode and the conductive yarn are electrically connected.

  A first characteristic configuration of the method for connecting electrodes of a conductive knitted fabric according to the present invention is, as described in claim 8, a conductive knitted fabric composed of a metal yarn or a metal film yarn knitted in a ground structure knitted with an insulating yarn. An electrode connection method for a conductive knitted fabric, wherein an external electrode terminal is electrically connected to a conductive knitted fabric having a conductive strip formed by a yarn, wherein the conductive yarn is added to the insulating yarn. A conductive knitting fabric knitting step of forming a conductive band-shaped portion, and heating the conductive band-shaped portion and the external electrode terminal via a resin adhesive sheet in a connection region between the conductive band-shaped portion and the external electrode terminal. A knitting step of kneading the conductive knitted fabric, wherein the knitting step of conductive knitted fabric comprises: a conductive yarn in which the conductive yarn is exposed on at least a part of a surface of a ground structure of the additional knitting portion in at least the connection region. The point is to form an exposed knitting part.

  The second characteristic configuration is, as described in the ninth aspect, in addition to the above-described first characteristic configuration, the electrode connecting step includes the step of connecting the conductive yarn in the conductive yarn expression knitting portion provided in the connection region. The point is that the external electrode terminal is thermocompression-bonded to the exposed side of the yarn via the resin adhesive sheet.

  As described above, according to the present invention, an electrode connection structure of a conductive knitted fabric and an electrode connection method of the conductive knitted fabric for electrically connecting the conductive knitted fabric and the external electrode terminals with sufficient adhesive strength are provided. You can now.

(A) is an explanatory view of a top view of an electrode connection structure of a conductive knitted fabric according to the present invention, and (b) is a photograph of a main part of the electrode connection structure in a top view. It is explanatory drawing of the joining (adhesion) method of a conductive knitted fabric. (A) is an organization chart of a main part of the additional knitting, and (b) is an organization chart of a main part of the float knitting. (A) is a photograph of one surface (front surface) of a conductive knitted fabric in which a striped conductive band portion is knitted by an additional thread on an insulating ground structure, and (b) is the other of the conductive knitted fabric. It is a photograph of the side (back side). (A) is a photograph of one surface (surface) of a conductive knitted fabric in which a striped conductive band is knitted by float knitting in an insulating ground structure, and (b) is the other of the conductive knitted fabric. It is a photograph of a surface (back side). (A) is an explanatory view showing the positional relationship between the knitted structure of the conductive knitted fabric and the resin adhesive sheet disposed on the electrode connection side, (b) is an explanatory view of another example, and (c) is a comparative example. FIG. 3D is an explanatory diagram of a comparative example. 5A is a photograph of an electrode connection structure in which external electrode terminals are joined to the surface of FIG. 5A, and FIG. 5B is a photograph of an electrode connection structure in which external electrode terminals are joined to the surface of FIG. 5B. (A) is an explanatory view of an experimental result of an adhesive strength between the electrode connection structure of the conductive knitted fabric according to the present invention and a comparative example, (b) is a characteristic diagram thereof, and (c) is an explanatory view of an experimental method.

Hereinafter, an electrode connection structure of a conductive knitted fabric and an electrode connection method of a conductive knitted fabric according to the present invention will be described with reference to the drawings.
FIGS. 1A, 1B and 2 show an electrode connection structure 10 of a conductive knitted fabric. The electrode connection structure 10 is a connection structure for electrically connecting the conductive knitted fabric 3 and the external electrode terminals 5. In the conductive knitted fabric 3, a conductive band portion 2 is formed by a conductive yarn 2a formed of a metal yarn or a metal film yarn woven into the ground structure 1 knitted by the insulating yarn 1a.

  The conductive strip 2 is composed of an additional yarn knitted portion in which a conductive yarn is added to an insulating yarn, and at least a connection area CA of the additional yarn knitted portion with the external electrode terminal 5 via a resin adhesive sheet 8. It has a thermocompression bonding portion 4 thermocompression-bonded to the external electrode terminal 5, and has a floating yarn knitting portion in which the conductive yarn 2a is float-knitted at least in the connection area CA.

  FIG. 3A shows the knitting structure of the auxiliary thread knitting. The auxiliary yarn is also referred to as plating knitting, and is realized by a knitting method in which the insulating yarn 1a and the conductive yarn 2a are supplied to the knitting needles from different yarn feeders. Since the arrangement of the insulating yarn 1a and the conductive yarn 2a in each knitting loop is stable, the conductive yarn 2a can be adjacent to all loops. Therefore, the conductive yarn 2a appears on one surface (front surface) of the knitted fabric, and the insulating yarn 1a appears on the other surface (back surface).

  FIG. 4A shows a photograph of one surface (front surface) of the conductive knitted fabric 3 on which the light and shade stripes are formed by the weft knitting, and FIG. (Back) is shown. On a ground structure 1 (light-colored stripes) knitted by the insulating yarn 1a, a conductive strip 2 (dark-colored stripes) in which the conductive yarn 2a is knitted by additional yarn is formed. The color of the conductive strip 2 on the other surface (back surface) where the insulating yarn 1a appears is lighter than that on one surface (front surface) where the conductive yarn 2a appears on the front surface.

  FIG. 3 (b) shows a knitting structure of a float knit as a floating yarn knitting portion. Float knitting is a variant of the spun knitting in which the insulating yarn 1a and the conductive yarn 2a are knitted in all the loops along the course direction, and is knitted so as to be missed in one or more loops along the course direction. You. In this example, knits and mistakes are alternately arranged in units of one loop in the course direction.

  FIG. 5A shows a photograph of one surface (surface) of the conductive knitted fabric 3 having a light and shade pattern obtained by float knitting, and FIG. 5B shows the other surface. A photograph of the side (back side) is shown. The conductive knitted fabric 3 is configured by repeating the basic pattern with a configuration in which the conductive yarn 2a is missed in a plurality of loops continuous in the course direction and knitted in one loop as a basic pattern.

  In FIG. 5A, since the conductive yarn 2a appears as a floating yarn due to a mistake in the ground structure 1 (light-colored stripe) knitted by the insulating yarn 1a, the mesh is coarser than that in FIG. 4A. Can be confirmed. In FIG. 5B, the insulating yarn 1a appears on the entire surface in a portion where the conductive yarn 2a becomes a floating yarn due to a mistake. In contrast to FIG. 4B, the conductive yarn 2a appears thin through the insulating yarn 1a. It can be confirmed that the knitted portion is spot-like.

  In this example, the width of the conductive strip 2 is 8 mm, and the width of the ground structure 1 between the adjacent conductive strips 2 is 8 mm. A yarn in which polyurethane elastic yarn is mixed with polyurethane yarn is used, and is configured to exhibit elasticity in a course direction and a wale direction. More specifically, the ground structure 1 is knitted with cotton yarn and polyurethane elastic yarn, and the conductive yarn 2a is knitted by float knitting, thereby forming the conductive band portion 2.

  By arranging the two conductive knitted fabrics 3 so as to overlap each other so that the conductive strips 2 are orthogonal to each other with the insulating layer interposed therebetween, the conductive knitted fabrics 3 can function as position-detectable input elements. By applying such an input element to clothing, an input device that remotely controls an electronic device by performing a touch operation on clothing can be realized. Note that this is only an example, and may be used as a heating element utilizing the resistance loss of the current flowing through the conductive strip 2, or may be used as the humidity detection element described in the Background Art section or as a signal transmission wiring. Is also possible. Any of them can be incorporated in clothes, bedsheets and the like.

  As shown in FIG. 2, the external electrode terminals 5 are formed on a flexible printed circuit board 20. The flexible printed board 20 is formed by laminating a copper foil pattern 23 by etching on a polyimide resin base board 21 and covering the polyimide resin insulating cover 22 except for the end of the copper foil pattern 23 which will be an electrode terminal. Have been done. The end portion of the copper foil pattern 23 exposed from the insulating coating portion 22 is gold-plated to become the external electrode terminal 5.

  The external electrode terminals 5 and the conductive strips 2 are opposed to each other with the resin adhesive sheet 8 interposed therebetween, and the heating element 9 is moved from behind the flexible printed circuit board 20 toward the conductive knitted fabric 3 via the covering sheet 30. By pressing with a predetermined pressure for a predetermined time, the resin adhesive sheet 8 is melted, and the conductive knitted fabric 3 and the external electrode terminals 5 are bonded while being electrically connected.

  As the insulating yarn 1a, synthetic fiber yarns such as polyester fiber and nylon fiber, natural fiber yarns such as cotton, silk and hemp, regenerated fiber yarns such as cupra and rayon, and mixed yarns thereof with elastic yarns can be used. . Note that "using a mixed yarn with an elastic yarn" as the insulating yarn 1a means that not only the elastic yarn and the other yarn are used as an integral yarn but also the elastic yarn and the other yarn are separately used as a knitting yarn. This is a concept that also includes knitting.

  A polyurethane or rubber-based elastomer material may be used alone as the elastic thread, or a covering thread using a polyurethane or rubber-based elastomer material for the core and nylon or polyester for the cover can be used. Although a monofilament yarn may be used as the insulating yarn 1a, a multifilament yarn or a spun yarn, which is an aggregate of a plurality of single fibers, is more preferably used.

  The fineness of the insulating yarn 1a is preferably from 10 dtex to 500 dtex, particularly preferably from 20 dtex to 400 dtex.

  As the conductive yarn 2a, a resin fiber, a natural fiber, a metal wire, or the like was used as a core, and a metal component was applied to the core by performing wet or dry coating, plating, vacuum film formation, or another appropriate application method. It is preferable to use a metal-coated wire (plated wire). A monofilament yarn may be used for the core, but a multifilament or spun yarn is more preferably used.

  The metal components to be adhered to the core include, for example, pure metals such as aluminum, nickel, copper, titanium, magnesium, tin, zinc, iron, silver, gold, platinum, vanadium, molybdenum, tungsten, cobalt, alloys thereof, and stainless steel. , Brass or the like can be used. In the present embodiment, a thread obtained by silver plating a multifilament made of nylon or polyester is used.

  The fineness of the conductive yarn 2a is preferably from 33 dtex to 400 dtex, particularly preferably from 70 dtex to 300 dtex.

  An example in which a metal-plated yarn in which a metal component is applied to a core yarn as the conductive yarn 5 has been described. For example, natural fibers or synthetic fibers such as Sylbern ZAG (registered trademark) manufactured by Japan New Materials Co., Ltd. are used. It is also possible to use a silver ion thread in which silver ions are adhered to. In the present specification, these are collectively referred to as metal-coated yarns.

  The ground structure is made of knitted fabric such as, for example, sheet knitting (flat knitting), rib knitting (rubber knitting, milling knitting), pearl knitting, denby knitting (tricot knitting), atlas knitting, cord knitting, or a change structure thereof. be able to.

  As the resin adhesive sheet 8, an anisotropic conductive film in which fine metal particles are dispersed in a thermosetting resin or a thermoplastic resin film can be suitably used. Examples of the thermoplastic resin film include a polyurethane hot melt resin, a polyester hot melt resin, a polyamide hot melt resin, an EVA hot melt resin, a polyolefin hot melt resin, a styrene elastomer resin, and a moisture-curable urethane hot melt. Resins and films made of reactive hot melt resins can be used.

  Returning to FIGS. 1A and 1B and FIG. 2, the description will be continued. In the electrode connection structure 10 of the conductive knitted fabric according to the present invention, the conductive band 2 in which the conductive yarn 2a is added to the insulating yarn 1a and the external electrode terminal 5 are connected to each other in the connection area CA via a resin adhesive sheet. When the conductive yarn 2a is float-knitted on the ground structure 1 in the connection area CA during thermocompression bonding, the insulating yarn constituting the ground structure exposed by the melted resin by float knitting and exposed near the conductive yarn 2a The ground tissue 1 and the external electrode terminal 5 are bonded with sufficient strength in a state where the conductive yarn 2a and the external electrode terminal 5 are electrically connected to each other because the conductive yarn 2a and the external electrode terminal 5 are electrically connected.

  It is preferable that the thermocompression bonding portion is thermocompression bonded to the external electrode terminal 5 via the resin adhesive sheet 8 on the surface of the floating yarn side of the conductive yarn 2a float-knitted in the connection area CA. Some degree of adhesive strength can be obtained even when thermocompression bonding is performed on the surface opposite to the yarn side surface. There is no particular limitation on the pattern of the knit and the mistake of the float knitting, but it is preferable that the knit of at least one loop and the mistake of a plurality of loops are repeated.

  In FIG. 6A, one surface (for convenience, denoted as “front surface”) of the float knitted conductive yarn 2 a on which the floating yarn side appears is thermocompressed to the external electrode terminal 5 via the resin adhesive sheet 8. 6B shows a cross section of the conductive knitted fabric 3 in FIG. 6B. In FIG. 6B, the other surface (the “back surface” for convenience) is opposite to the floating yarn side of the float-knitted conductive yarn 2a. ()) Shows a cross section of the conductive knitted fabric 3 when thermocompression-bonded to the external electrode terminal 5 via the resin adhesive sheet 8.

  As shown in FIG. 6B, on the surface (back surface) of the conductive yarn 2a float-knitted in the connection area CA on the side opposite to the floating yarn, the infiltration of the resin melted at the knitted portion P1 into the insulating yarn 1a occurs. Since there is a tendency to be hindered by the conductive yarn 2a, infiltration of the resin into the ground tissue 1 is inhibited at the site, and a sufficient anchoring effect is not exerted. However, at the missed site P2, the molten resin sufficiently flows into the insulating yarn 1a. Since it infiltrates the surface, a certain degree of anchor effect is exhibited. FIG. 7B shows an example of an electrode connection structure employing such a configuration.

  Since the conductive yarn 2a is composed of a metal yarn or a metal film yarn, even if the core is composed of a twisted yarn or a multifilament yarn, the molten resin does not easily infiltrate the core yarn and a sufficient anchor There is no effect.

  On the other hand, as shown in FIG. 6A, the knitted portion P3 is hardly exposed on the surface (surface) on the floating yarn side of the conductive yarn 2a float-knitted in the connection area CA. The infiltration of the melted resin into the insulating yarn 1a is not hindered by the conductive yarn 2a, and at the missed portion P4, the molten resin passes through the gap between the conductive yarns 2a serving as floating yarns and sufficiently passes through the insulating yarn 1a. Due to the infiltration, a more sufficient anchor effect is exhibited. FIG. 7A shows an example of an electrode connection structure employing such a configuration.

  In FIG. 6 (c), one surface (front surface) where the conductive yarn 2a of the conductive knitted fabric 3 in which the insulating yarn 1a and the conductive yarn 2a are added and knitted appears through the resin adhesive sheet 8 to form the external electrode. FIG. 6D shows a cross section of the conductive knitted fabric 3 when thermocompression-bonded to the terminal 5, and FIG. 2 shows a cross section of the conductive knitted fabric 3 when thermocompression-bonded to the external electrode terminal 5 via the.

  As shown in FIG. 6C, on the surface where the conductive yarn 2a appears, the conductive yarn 2a woven in the connection area CA prevents the infiltration of the resin into the insulating yarn 1a, so that a sufficient anchor effect is exhibited. Not done. Further, as shown in FIG. 6D, even on the back surface where the conductive yarn 2a is hidden, the resin infiltrated into the insulating yarn 1a is hindered by the nearby conductive yarn 2a, so that the infiltration of the resin in the thickness direction is hindered. After all, a sufficient anchor effect is not exhibited.

  Therefore, it is important that the conductive yarn 2a is float-knitted with respect to the ground structure 1 at least in the connection region CA, and the conductive band 2a where the conductive yarn 2a is float-knitted with respect to the ground structure 1 in other than the connection region CA. 2 may be formed.

  As shown in FIG. 1A, a plurality of external electrode terminals 5 are provided on a base 21 extending along the width direction of the conductive strip 2 at intervals smaller than the width of the conductive strip 2 (in this example, FIG. 1A). It is preferable that a plurality of external electrode terminals 5 are thermocompression-bonded to the conductive strip 2.

  The ground structure 1 and the electrode 5 are bonded with the resin while the external electrode terminal 5 is in electrical contact with the conductive yarn 2a, and the base material 21 exposed between the ground structure 1 and the electrode 5 is bonded with the resin. You. In the case where the electrode 5 is covered with gold or the like as in this example, even if the covering portion gold is partially peeled off from the copper pattern, even if the electrode 5 is sufficiently covered with the base material 21. Since they are adhered, poor conduction between the electrode 5 and the conductive yarn 2a due to peeling can be avoided.

  Further, it is preferable that the interval between the outsides of the external electrode terminals 5 located on both sides of the plurality of arranged external electrode terminals 5 is slightly wider than the width of the conductive strip 2. Even if the conductive knitted fabric 3 after the post-processing such as refining expands and contracts, and the width of the conductive strip 2 fluctuates somewhat, the fluctuation can be absorbed at the time of bonding. become.

  Note that the external electrode terminal 5 may have a width equal to or slightly larger than the width of the conductive strip 2.

  In addition, the ground structure existing between the adjacent conductive strips 2 (region of the ground structure between the joining regions indicated by reference numeral CA in FIG. 1A) is also connected to the flexible printed circuit board 20 via the resin adhesive sheet 8. It is preferable to be configured so as to be bonded to the base material 21, so that the bonding strength between the conductive knitted fabric 3 and the flexible printed board 20 can be increased.

  In the above-described embodiment, the conductive knitted fabric 3 in which the width of the conductive strip 2 is 8 mm and the width of the ground structure 1 between the adjacent conductive strips 2 is 8 mm is described. The width of the conductive strip 2 and the width of the ground structure 1 between the conductive strips 2 are not particularly limited, and may be appropriately set according to the application. The number of the conductive strips 2 is also arbitrary.

  In the above-described embodiment, as the insulating yarn 1a constituting the ground structure 1, a cotton yarn and a polyurethane elastic yarn are knitted by knitting, and the conductive knitted fabric 3 is configured to exhibit elasticity in the course direction and the wale direction. However, if the conductive knitted fabric 3 was knitted using a low-melting polyurethane elastic yarn and then heat-set, a part of the melted polyurethane elastic yarn was fused to the stitch to provide a function to prevent unraveling. The conductive knitted fabric 3 can be realized.

  In the above-described embodiment, an example in which the external electrode terminals 5 are formed on the base material 21 of the flexible printed board 20 has been described, but the external electrode terminals 5 connected to the conductive knitted fabric 3 are formed on the flexible printed board 20. The external electrode terminals 5 are not limited to those, and may be external electrode terminals 5 formed on a rigid printed board.

  In the above-described embodiment, an example has been described in which the connecting region includes the floating yarn knitting portion formed by float knitting and the conductive yarn is exposed on at least a part of the surface of the ground structure of the auxiliary yarn knitting portion. It is also possible to adopt jacquard knitting other than float knitting as the floating yarn knitting part.

  Also, an example in which the conductive yarn is exposed on at least a part of the surface of the ground structure of the auxiliary yarn knitting portion by the floating yarn knitting portion has been described. The conductive yarn can be exposed on at least a part of the exposed surface of the ground structure of the yarn knitting portion, and the conductive yarn exposed knitting portion may be formed as a concept including the floating yarn knitting portion.

  As described above, the electrode connection method for a conductive knitted fabric according to the present invention is a method of connecting a conductive belt-shaped portion to a conductive yarn 2a composed of a metal yarn or a metal film yarn knitted in a ground structure 1 knitted by an insulating yarn 1a. An electrode connection method of a conductive knitted fabric for electrically connecting an external electrode terminal 5 to a conductive knitted fabric 3 on which a conductive band 2 is formed. A knitting step of forming a conductive knitted fabric 3 and thermocompression bonding of the conductive strip 3 and the external electrode terminal 5 via a resin adhesive sheet 8 in a connection area CA between the conductive strip 2 and the external electrode terminal 5. A conductive knitting fabric knitting step, wherein the conductive yarn exposing knitting step comprises exposing the conductive yarn 2a to at least a part of the surface of the ground structure of the additional yarn knitting portion in at least the connection area CA. It is configured to form a part. Tack knitting can be adopted as a knitting method for forming the conductive yarn exposing knitting portion. In addition, it is also possible to form the conductive yarn expression knitting portion by a floating yarn knitting portion employing float knitting or jacquard knitting.

  The electrode connecting step is configured to be thermocompression-bonded to the external electrode terminal 5 via the resin adhesive sheet 8 on the floating yarn side of the conductive yarn 2a in the conductive yarn exposed knitting portion provided in the connection area CA. Is preferred.

An experimental example will be described below.
Conductive yarn 2a is float-knitted in the course direction by repeating 1 loop knit and 3 loop mistakes on the ground structure 1 where the cotton yarn and the polyurethane elastic yarn are knitted and knitted by heat setting. Samples A and B in which a conductive strip 2 of 8 mm was formed were manufactured, and at the same time, a conductive yarn 2a was additionally knitted and knitted on a ground structure 1 in which cotton yarn and polyurethane elastic yarn were knitted. Comparative samples C and D in which the conductive strips 2 having a width of 8 mm were formed in the wale direction by the unwinding treatment were manufactured.

  Sample A is bonded to the external electrode terminals 5 formed on the flexible substrate 20 via an anisotropic conductive film on the surface where the floating yarn as the conductive yarn 2a appears, and Sample B is the back surface where the floating yarn as the conductive yarn 2a is hidden. And an external electrode terminal 5 formed on a flexible substrate 20 via an anisotropic conductive film 8.

  Sample C is bonded to the external electrode terminal 5 formed on the flexible substrate 20 via the anisotropic conductive film on the surface where the conductive yarn 2a appears, and Sample D is provided with the anisotropic conductive film 8 on the back surface where the conductive yarn 2a is hidden. And the external electrode terminal 5 formed on the flexible substrate 20 through the intermediary.

  As shown in FIG. 8 (c), the knitted fabric was cut into a rectangle having a knitted fabric width of 9 mm with the joining region CA interposed therebetween, and the knitted fabric was coated with a resin so as to inhibit the elongation characteristics of the knitted fabric. The tensile tester (vertical electric measuring stand MX-500N and digital force gauge ZTS-100N manufactured by IMADA) is set at an interval of 2 cm between upper and lower grips, and a tensile test is performed at a tensile speed of 100 mm / min to determine the tensile shear bond strength. Measured.

  As shown in FIGS. 8A and 8B, the tensile shear adhesive strength of Samples A and B is superior to Comparative Samples C and D, and the tensile shear adhesive strength of Sample A is higher than that of Sample B. Turned out to be excellent.

  External electrode terminals can be electrically and firmly connected to a conductive knitted fabric in which a conductive band is formed by a conductive yarn composed of a metal yarn or a metal film yarn knitted in a ground structure knitted by an insulating yarn. It is possible to provide a conductive knitted fabric that can be used for any application that can realize an electrode connection structure of the conductive knitted fabric.

1: ground structure 1a: insulating yarn 2: conductive strip 2a: conductive yarn 3: conductive knitted fabric 4: thermocompression bonding portion 5: external connection terminal 8: resin adhesive sheet 10: electrode connection structure 20: flexible printed board 21: Base material CA: Connection area

Claims (9)

Conductivity for electrically connecting a conductive knitted fabric with a conductive band formed by a conductive yarn composed of a metal yarn or a metal film yarn knitted to a ground structure knitted with an insulating yarn and an external electrode terminal An electrode connection structure for a knitted fabric,
The conductive belt-shaped portion is formed of a spun knitted portion in which the conductive yarn is spun onto the insulating yarn, and a connection region of the spun knitted portion with the external electrode terminal through a resin adhesive sheet. Comprising a thermocompression bonding portion thermocompression bonded to the external electrode terminal,
An electrode of a conductive knitted fabric, wherein a conductive yarn exposing knitting part in which the conductive yarn is exposed is formed on at least a part of an exposed surface of a ground structure of the additional yarn knitting part in the connection region. Connection structure.   The thermocompression bonding portion is thermocompression-bonded to the external electrode terminal via the resin adhesive sheet on the conductive yarn exposing side of the conductive yarn exposing knitting portion formed in the connection region. The electrode connection structure for a conductive knitted fabric according to claim 1.   The conductive knitting part according to claim 1, wherein the conductive yarn exposing knitting part is configured by a floating yarn knitting part in which the conductive yarn is knitted by either float knitting or jacquard knitting. Ground electrode connection structure.   A plurality of the external electrode terminals are arranged at intervals smaller than the width of the conductive strip on a substrate extending along the width direction of the conductive strip, and a plurality of the external electrodes are arranged on the conductive strip. The electrode connection structure for a conductive knitted fabric according to any one of claims 1 to 3, wherein the terminals are thermocompression-bonded.   The electrode connection structure for a conductive knitted fabric according to any one of claims 1 to 4, wherein the insulating yarn is a mixed yarn of a natural fiber yarn, a recycled fiber yarn, or a synthetic fiber yarn and an elastic yarn.   The electrode connection structure for a conductive knitted fabric according to any one of claims 1 to 5, wherein the resin adhesive sheet is an anisotropic conductive film in which fine conductive particles are dispersed in a thermosetting resin. .   The electrode connection structure for a conductive knitted fabric according to any one of claims 1 to 5, wherein the resin adhesive sheet is a thermoplastic resin sheet. Conductive knitting for electrically connecting external electrode terminals to a conductive knitted fabric having a conductive band formed by a conductive yarn composed of a metal yarn or a metal film yarn knitted in a ground structure knitted by an insulating yarn A ground electrode connection method,
A conductive knitting step of knitting the conductive yarn on the insulating yarn to form the conductive band portion;
An electrode connection step of thermocompression bonding the conductive strip and the external electrode terminal via a resin adhesive sheet in a connection region between the conductive strip and the external electrode terminal;
With
The conductive knitting knitting step forms a conductive yarn exposing knitting part in which the conductive yarn is exposed on at least a part of an exposed surface of a ground structure of the additional yarn knitting part in at least the connection region. Method for connecting electrodes of a conductive knitted fabric.   The electrode connection step is characterized in that the conductive yarn is kneaded with the external electrode terminal via the resin adhesive sheet on the exposed side of the conductive yarn in the conductive yarn exposed knitting portion provided in the connection region. Item 9. The method for connecting electrodes of a conductive knitted fabric according to Item 8.