JP5516514B2 - Wiring member - Google Patents

Description

  The present invention relates to a wiring member provided with a plurality of connection electrode portions.

  As a wiring member capable of high-density wiring in a limited space, for example, a flat cable in which a plurality of conductors are arranged on one plane and an insulating film is laminated from both sides of the arrangement surface is used. The wiring member made of the flat cable has an end portion as a connection portion, and in this connection portion, a connection electrode portion made up of a plurality of conductors arranged at a predetermined interval is exposed, and a connection partner having a plurality of connection electrode portions The wiring member is connected and wired.

  As such a wiring member, a conductive paste layer laminated on a plurality of connection electrode parts affixed to a base material, and a thermoplastic resin material as a main ingredient are laminated on a portion excluding the connection electrode part. Insulating resin adhesive layers are known (see, for example, Patent Documents 1 and 2). In such a wiring member, the connection electrode parts are conductively connected to each other by the conductive paste layer by bonding them to a connection partner wiring member having a plurality of connection electrode parts, and the base materials are insulative adhesives. Glued by layers.

JP 2011-77125 A JP 2011-77126 A

  In the wiring member, the upper surface positions of the conductive paste layer and the insulating resin adhesive layer are arranged in the same plane. When a connection partner wiring member is connected to such a wiring member, the connection electrode portion protruding from the base member of the connection partner wiring member adheres to the conductive paste, but an insulating resin is formed laterally to the connection electrode portion. The adhesive of the adhesive layer may not enter smoothly. In that case, adhesion of the adhesive to the surface of the substrate becomes insufficient, and there is a possibility that poor adhesion between the wiring members may occur. In addition, since the conductive paste of the conductive paste layer is crushed by the connection electrode portions of each wiring member and spreads sideways, the conductive pastes of the adjacent connection electrode portions contact each other and the connection electrode portions are short-circuited. There was also a risk.

  An object of the present invention is to provide a wiring member that can be satisfactorily connected to a wiring member of a connection partner without problems such as poor adhesion and short circuit.

The wiring member of the present invention capable of solving the above problems is applied to a base material made of an insulating material, a plurality of connection electrode portions arranged in parallel on one surface of the base material, and the connection electrode portion. A conductive paste, and an adhesive applied on the substrate on the side of the connection electrode portion,
The conductive paste has a width dimension in the arrangement direction of the connection electrode portions smaller than a width dimension of the connection electrode portions, and a surface of the conductive paste protrudes in a direction opposite to the base material from the adhesive surface. ,
A part of the adhesive is also applied to the surface of the connection electrode portion opposite to the base material.

  In the wiring member of the present invention, it is preferable that the substrate is transparent.

According to the present invention, when connecting and connecting the connection partner wiring member, first, the connection electrode portion of the connection partner wiring member comes into contact with the conductive paste protruding from the adhesive, so that reliable conduction is achieved. Secured. Further, the conductive paste is sandwiched and crushed by the connection electrode portions, and is in good contact with the connection electrode portions. At this time, since the width dimension of the conductive paste is smaller than the width dimension of the connection electrode part, and the adhesive is also applied to the connection electrode part, the conductive pastes of the adjacent connection electrode parts even when crushed The problem of short circuiting due to contact is also prevented.
Further, the adhesive enters between the connection electrode portions of the wiring member to be connected and makes good contact with the base material. Furthermore, since part of the adhesive enters between the portions of the connection electrode portion where there is no conductive paste, the connection electrode portion of the wiring member of the present invention and the connection electrode portion of the wiring member of the connection partner are bonded together by the adhesive.
Therefore, it can be satisfactorily connected to the wiring member of the connection partner without problems such as adhesion failure and short circuit.

It is a top view which shows one Embodiment of a wiring member. It is a sectional side view of a wiring member. It is a sectional side view in the connection part of a wiring member. It is a cross-sectional view in the connection part of a wiring member. It is a cross-sectional view shown about the connection of the wiring member of the other party to the connection part of a wiring member. It is a sectional side view shown about the connection of the wiring member of the other party to the connection part of a wiring member. It is a cross-sectional view of the connection part where the wiring member of the other party was connected to the wiring member. It is a figure which shows the conductor paste and adhesive agent in the connection location of connection electrode parts, Comprising: (a) And (b) is an expanded sectional view, respectively. It is a figure which shows the wiring member which concerns on a reference example, Comprising: (a) And (b) is a cross-sectional view of a wiring member, respectively. It is a perspective view which shows the method of manufacturing a wiring member. It is a top view of the elongate flat cable which shows the middle of manufacture of a wiring member. It is a top view of the wiring member in the middle of manufacture. It is a sectional side view of the wiring member in the middle of manufacture. It is a sectional side view of the wiring member in the middle of manufacture by a different manufacturing method. It is a sectional side view of the wiring member in the middle of manufacture by a different manufacturing method. It is a cross-sectional view explaining the transfer process of the electrically conductive paste and adhesive agent to the connection part of a wiring member. It is a cross-sectional view explaining the transfer process of the electrically conductive paste and adhesive agent to the connection part of a wiring member. It is a sectional side view of the wiring member which concerns on a modification. It is a sectional side view of the connection part of the wiring member which concerns on a modification.

Hereinafter, an example of an embodiment of a wiring member according to the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the wiring member 1 includes a plurality of rectangular conductors 2 made of, for example, copper (including plated copper) or a rolled copper foil of a copper alloy. These flat conductors 2 are arranged on a plane at a predetermined parallel pitch, and insulating films 3a and 3b are bonded (laminated) to both surfaces of the flat conductor 2 arrangement surface. The wiring member 1 is a flat cable in which a plurality of flat rectangular conductors 2 are arranged on one plane, and insulating films 3a and 3b are laminated from both sides of the arrangement surface. In addition, although the example which has the four rectangular conductors 2 is shown in FIG. 1, the number of the rectangular conductors 2 is changed suitably. For example, the number of flat conductors 2 may be 20.

  The insulating films 3a and 3b are made of a base material part formed from a resin such as polyethylene terephthalate, polyester, polyimide or polyphenylene sulfide, a polyester adhesive or a flame retardant polyvinyl chloride insulating adhesive, a flame retardant polyolefin, or the like. It has the adhesion layer which becomes. Two insulating films 3a and 3b are bonded to the flat conductor 2 with the adhesive layer faced. Thus, electrical insulation between the rectangular conductors 2 is achieved. The thicknesses of the insulating films 3a and 3b are preferably 0.02 mm or more and 0.15 mm or less, respectively.

  As shown in FIG. 3, both end portions in the longitudinal direction of the wiring member 1 are connected portions 11, and a connecting member wiring member 21 described later is connected to the connecting portion 11.

  In the connection portion 11 of the wiring member 1, a part of the flat conductor 2 is exposed from the insulating films 3 a and 3 b, and the exposed flat conductor 2 serves as a connection electrode portion 12. In the connection portion 11, a reinforcing base material (base material) 14 is attached to one side surface, so that the connection electrode portion 12 of the flat conductor 2 is parallel to one surface of the reinforcing base material 14. Has been placed. An adhesive is applied to the reinforcing base material 14 on the side to be bonded to the connection portion 11, whereby the reinforcing base material 14 is adhered to the end portion of the one insulating film 3 a and the connection electrode portion 12. ing. The reinforcing base material 14 is made of an insulating resin such as polyethylene terephthalate, and the thickness is preferably 0.15 mm or more and 0.20 mm or less. A polyester-based adhesive is used as the adhesive applied to the reinforcing substrate 14.

  As shown in FIGS. 3 and 4, in the connection part 11 of the wiring member 1, a conductive paste 15 is applied to the connection electrode part 12. Further, an adhesive 16 is applied on the reinforcing base material 14 on both sides of the connection electrode portion 12.

  As shown in FIG. 4, the conductive paste 15 is applied so that the width dimension W <b> 2 in the arrangement direction of the connection electrode portions 12 is smaller than the width dimension W <b> 1 of the connection electrode portion 12 made of the flat conductor 2. Accordingly, the connection electrode portion 12 has a shoulder portion 12a on the surface opposite to the reinforcing base material 14 to which the conductive paste 15 is not applied. Part of the adhesive 16 is also applied to the shoulder 12a. The conductive paste 15 protrudes in a direction opposite to the reinforcing base 14 from the adhesive 16.

  The conductive paste 15 is composed of conductive particles and an adhesive. As the conductive particles, for example, silver powder, carbon powder, copper powder, nickel powder, or a mixed powder thereof can be used. As the adhesive constituting the conductive paste 15, for example, any of a polyester adhesive, a polyurethane adhesive, an epoxy adhesive, and the like can be used. In particular, as the conductive paste 15, a silver paste including a flaky silver powder having an average particle diameter of 0.5 to 5 μm and a spherical silver powder having an average particle diameter of 20 nm or less coated with an organic substance on the surface is employed. Is preferred. By including nano silver particles in the silver paste, the connection resistance is lowered, and the surface irregularities are also reduced, thereby increasing the connection area. For this reason, the reliability of electrical connection is improved.

  Moreover, as the adhesive 16, for example, a polyester or polyamide hot melt adhesive having a melting temperature of about 100 to 170 ° C. is used. As this adhesive 16, JELCONAD-HM6 manufactured by Jujo Chemical Co., Ltd., PES310S30 manufactured by Toa Gosei Co., Ltd., PES375S40 manufactured by the same company, and the like can be used.

  As shown in FIGS. 5 and 6, the wiring member 21 having the above configuration is connected to the connection member 11 at the connection member 11. The wiring member 21 to be connected includes a base material 22 made of, for example, a flat cable, a flexible printed circuit board, or a hard board, and a plurality of connection electrode portions 23 that are bonded and fixed to the base material 22. The width dimension and pitch of the connection electrode portion 23 are substantially the same as those of the connection electrode portion 12 of the wiring member 1.

  As shown in FIG. 7, by connecting the wiring member 21 to be connected to the connection portion 11 of the wiring member 1, the connection electrode portions 12 and 23 are electrically connected to each other by the conductive paste 15, and the reinforcing base material 14 and the base material 22 are bonded by an adhesive 16. Further, part of the adhesive 16 enters between the connection electrode portions 12 and 23. Thereby, the connection electrode portions 12 and 23 are bonded to each other by the adhesive 16.

  In addition, when the reinforcement base material 14 of the wiring member 1 is transparent, when connecting to the wiring member 21 of the connection partner, the wiring member 1 is overlapped so as to cover the wiring member 21 of the connection partner from above. It is preferable to match. If it does in this way, the position of the mutual connection electrode parts 12 and 23 can be visually judged or automatically determined with an electronic device as image data through the transparent reinforcement base material 14, and can be aligned.

  In the wiring member 1 according to the present embodiment, when the connection partner wiring member 21 is bonded to the connection portion 11 of the wiring member 1, first, as shown in FIG. The conductive electrode 15 contacts the connection electrode portion 23 of the wiring member 21 of the connection partner, so that the connection electrode portions 12 and 23 are electrically connected. Further, when the wiring member 21 to be connected is pressed against the connection part 11 of the wiring member 1, the conductive paste 15 is sandwiched and crushed by the connection electrode parts 12 and 23 as shown in FIG. As a result, the conductive paste 15 is in good contact with the connection electrode portion 23. Even if the conductive paste 15 is crushed and spread to the side, the adhesive 16 applied to the shoulder 12a of the connection electrode portion 12 suppresses the conductive paste 15 that is about to spread. The trouble that the conductive paste 15 of the part 12 contacts and short-circuits is also prevented.

Further, the adhesive 16 enters between the connection electrode portions 23 of the wiring member 21 to be connected and contacts the base material 22 of the wiring member 21. Furthermore, since a part of the adhesive 16 also enters between the connection electrode portions 12 and 23, the portions of the connection electrode portions 12 and 23 that do not have the conductive paste 15 are bonded together by the adhesive 16.
Therefore, according to the wiring member 1 which concerns on this embodiment, it can be made to connect favorably with the wiring member 21 of a connection other party, without malfunctions, such as adhesion failure and a short circuit.

  Further, when the reinforcing base material 14 is transparent, the connection location can be visually observed through the transparent reinforcing base material 14 when connecting to the wiring member 21 of the connection partner. Thereby, the connection electrode parts 12 and 23 of the wiring members 1 and 21 can be easily and highly accurately aligned and connected to each other, and connection reliability can be improved.

  Here, a reference example is shown in FIG. A wiring member 41 shown in FIG. 9A includes a conductive paste 15 having a width dimension substantially the same as that of the connection electrode portion 12, and is raised so that the adhesive 16 protrudes upward from the conductive paste 15. Is. As shown in FIG. 9B, when the wiring member 21 of the connection partner is superimposed on the wiring member 41, the raised adhesive 16 is crushed by the base material 22 of the wiring member 21 of the connection partner. It flows to the side. Then, the adhesive 16 is disposed so as to run on the upper surface side of the conductive paste 15. Thereby, the contact of the conductive paste 15 to the connection electrode portion 23 of the wiring member 21 is hindered by the adhesive 16, and there is a possibility that the connection electrode portions 12, 23 of the wiring members 21, 41 are poorly connected.

  In the wiring member 1 according to the present invention, the conductive paste 15 is narrower than the connection electrode portion 12 and higher than the adhesive 16 as described above (the surface of the conductive paste 15 is reinforced more than the surface of the adhesive 16). 9 protrudes in the opposite direction to the base material 14), and there is no possibility that a problem such as the example of FIG. 9 occurs.

Next, a method for manufacturing the wiring member 1 having the above structure will be described.
As shown in FIG. 10, the rectangular conductors 2 are fed out from a plurality of reels 30 around which the long rectangular conductors 2 are wound, and arranged on the same plane at a predetermined parallel pitch. Then, the long insulating cables 3a and 3b are fed from the reel 31 to the front and back of these flat conductors 2 and passed between the heater rollers 32, and the insulating films 3a and 3b are heated and simultaneously pressed and bonded together. And The long flat cable is wound around the winding roller 33. A window portion 35 is formed in a part of the insulating films 3a and 3b in the longitudinal direction. The insulating films 3a and 3b are bonded so that the respective window portions coincide with each other. The window portion of the flat cable thus formed becomes the connection portion 11.

  Next, as shown in FIG. 11, in order to remove the excess part (part called an ear | edge) of the width direction of insulating film 3a, 3b, it cut | disconnects in the position shown with the chain line C1 of a long flat cable. Thereby, the location where insulating film 3a, 3b was connected to the longitudinal direction in the width direction both ends of the window part 35 is removed.

  Further, the long flat cable is cut at a position indicated by a chain line C2 passing through the center of the window 35, and is formed of a flat cable of a predetermined length as shown in FIG. 12 and FIG. The wiring member 1 is exposed and provided with the connection electrode portion 12.

  In addition, a long flat cable is produced in advance without forming the window portion 35, and an excessive portion in the width direction of the insulating films 3a and 3b of the long flat cable is removed, and further cut to a flat of a predetermined length. After forming the wiring member 1 made of a cable, the portions near the both ends of the insulating films 3 a and 3 b may be removed at both ends of the wiring member 1.

  In this case, as shown in FIG. 14, the insulating films 3a and 3b in the vicinity of both ends of the wiring member 1 are cut from the front and back with a cutter 37, and as shown in FIG. The films 3a and 3b are pulled out and removed.

  A reinforcing base material 14 is attached to one surface of the flat conductor 2 exposed at both ends of the wiring member 1. Thereafter, the conductive paste 15 is applied to the connection electrode portion 12 made of the flat conductor 2, and the adhesive 16 is applied on the reinforcing base material 14 on both sides of the connection electrode portion 12. These conductive paste 15 and adhesive 16 can be applied to the connecting portion 11 by transfer.

Next, a transfer process for transferring the conductive paste 15 and the adhesive 16 to the connection portion 11 of the wiring member 1 will be described.
As shown in FIG. 16, a conductive paste 15 is applied at a predetermined pitch to a transfer release film 51 formed from a resin such as polyethylene terephthalate (PET), and an adhesive is provided between the conductive pastes 15. A transfer film 52 filled with 16 is prepared. The width of the conductive paste 15 is narrower than the width of the connection electrode, and it is preferable to apply 1/4 or more of the width of the connection electrode portion 12. In order to apply the adhesive to the shoulder 12 a of the connection electrode portion 12, it is preferable that the width of the conductive paste 15 is up to ½ of the width of the connection electrode portion 12.

  The transfer film 52 is superposed on the connection portion 11 of the wiring member 1 and placed on the surface plate 54 via the cushion material 53, and the heat tool 55 is lightly pressed from above to be heated. If it does in this way, the top part of the conductive paste 15 will be pressed against the connection electrode part 12 and will be crushed and flattened, and the adhesive 16 on the transfer film 52 side will be softened by heat and peeled off from the release film 51. It descends on the reinforcing base 14 of the member 1 or on the connection electrode part 12.

  After performing the transfer press in this way, the wiring member 1 is taken out, and the release film 51 of the transfer film 52 is peeled off as shown in FIG.

  Then, the conductive paste 15 is applied onto the connection electrode portion 12 in a state where the surface of the conductive paste 15 protrudes in the direction opposite to the reinforcing base 14 from the surface of the adhesive 16, and the width dimension W2 of the conductive paste 15 is connected. It becomes smaller than the width dimension W1 of the arrangement direction of the electrode part 12. And the wiring member 1 by which a part of adhesive 16 was apply | coated also on the shoulder part 12a of the connection electrode part 12 is obtained.

  In addition, in the said embodiment, although the connection part 11 was comprised by affixing the reinforcement base material 14 on the one surface side of the flat conductor 2 from which the front and back were exposed by removing insulating film 3a, 3b by an edge part. As shown in FIGS. 18 and 19, only the other insulating film 3b may be removed to expose the flat conductor 2 to form the connection electrode portion 12. FIG. In this case, one insulating film 3a from which the end portion is not removed serves as a base material. In this case, it is preferable to use a transparent film as the insulating film 3a serving as a base material. Thereby, since the connection electrode parts 12 and 23 can be seen through this insulating film 3a at the time of connection with the wiring member 21 of a connection other party, those positioning can be performed easily and with high precision.

  A reinforcing base material (base material) 14 as shown in FIG. 3 may be attached to the surface of the insulating film 3 a opposite to the connection electrode portion 12. In that case, both the insulating film 3a and the reinforcing base material 14 are base materials, and they may be transparent.

  In the above embodiment, as the wiring member 1, a flat cable in which a plurality of flat conductors 2 are arranged on one plane and insulating films 3 a and 3 b are laminated from both sides of the arrangement surface has been described as an example. The wiring member 1 may be a flexible printed board or a hard board provided with the connection electrode portion 12.

1: Wiring member, 3a: Insulating film (base material), 12: Connection electrode part, 14: Reinforcing base material (base material), 15: Conductive paste, 16: Adhesive, W1: Width of connection electrode part, W2 : Width of conductive paste

Claims (2)

A wiring member in which a plurality of flat conductors are arranged on one plane, and both ends of a flat cable laminated with an insulating film from both sides of the arrangement surface are connected portions,
In the connection part, the exposed rectangular conductor is a connection electrode part,
A reinforcing substrate first adhesive Ri Do insulating material is applied, a plurality of the connecting electrode portion arranged in parallel on said first adhesive on one surface of the reinforcing substrate, A conductive paste applied to the connection electrode part, and a second adhesive applied on the first adhesive on the connection base material on the side of the connection electrode part,
The conductive paste has a width dimension in the arrangement direction of the connection electrode portions smaller than a width dimension of the connection electrode portions, and the surface of the conductive paste is more reinforced than the surface of the second adhesive. Protruding in the opposite direction,
A part of the second adhesive is also applied to the surface of the connection electrode portion opposite to the reinforcing base material. The wiring member according to claim 1,
The wiring member, wherein the reinforcing substrate is transparent.

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