JP2013004314A - Flat cable - Google Patents

Abstract

Provided is a flat cable having excellent electrical connection reliability while suppressing cost as much as possible.
A plurality of connection terminals 23 of a connection member 21 are arranged at the same pitch as connection electrodes 12 made of flat conductors 2 in which connection conductor portions 24 are arranged at a pitch of 0.3 mm or less, and wide portions 25 are arranged. The electrodes are alternately shifted in a direction orthogonal to the direction and arranged in a staggered manner with a gap therebetween, and the connection electrode 12 and the connection conductor portion 24 are conductively connected via the conductive paste 15, and the reinforcing substrate 14 and the connection base are connected. The material 22 is bonded to the adhesive 16, and the connection electrode 12 and the connection conductor portion 24 are in contact with the conductive paste 15 within the range of the width dimensions W 1 and W 4, and a part of the adhesive 16 is connected to the connection electrode 12. And a portion of the connecting conductor portion 24 where the conductive paste 16 is not applied.
[Selection] Figure 5

Description

  The present invention relates to a flat cable used for wiring of an electronic device or the like.

  As a wiring member capable of high-density wiring in a limited space, insulation that fixes a conductor composed of a plurality of tin-plated annealed copper foils arranged at predetermined intervals and the conductor so as to be sandwiched from both sides A flat cable having a covering portion made of a tape is used (for example, see Patent Document 1). In the flat cable described in Patent Document 1, the conductor arrangement pitch is 0.3 mm or less.

  In addition, a wide portion and a narrow portion are formed along the longitudinal direction of each conductor, and between adjacent conductors, the wide portion of one conductor and the narrow portion of the other conductor are adjacent to each other. There is also known a flat cable having a matching portion and a portion where the narrow portion of one conductor and the wide portion of the other conductor are adjacent to each other (see, for example, Patent Document 2).

JP 2003-208821 A JP 2004-319247 A

  The flat cable has a conductor exposed at its end to form a connection electrode portion, and a connector is connected to a connection portion having a connection electrode portion made of this conductor. Then, the connection terminal of the connector is pressed against the connection electrode portion made of a conductor of the flat cable and is electrically connected.

  However, in recent years, a flat cable described in Patent Document 1 has been required to have a conductor pitch with a narrow pitch of, for example, 0.3 mm or less. There is a possibility that the connection electrode portion made of the exposed conductor and the connection terminal of the connector are displaced, resulting in poor connection.

In this case, as in the flat cable described in Patent Document 2, a wide portion and a narrow portion are formed along the longitudinal direction of each conductor, and the wide portion is connected to a connection terminal of the connector. If it is set as an electrode part, the improvement with the connection terminal of a connector can be aimed at.
However, a flat cable in which conductors having a wide part and a narrow part are arranged along the longitudinal direction must be arranged with high precision at the time of manufacture, and it is difficult to manufacture and costs. Invite up.

  An object of the present invention is to provide a flat cable with excellent electrical connection reliability while suppressing cost as much as possible.

The flat cable of the present invention capable of solving the above-mentioned problems is a flat cable in which an insulating film is bonded from both sides of a plurality of conductors arranged on a plane and a connection member is attached to an end portion. And the one side surface of the conductor is covered with a base material at the end portion, and the other side surface is not covered with the insulating film and is a connection electrode,
The conductors are juxtaposed at a pitch of 0.3 mm or less,
The connection member includes a connection base material made of an insulating material, and a plurality of connection terminals arranged in parallel on one surface of the connection base material,
The connection terminal includes a wide portion having a width dimension larger than that of the conductor, and a connection conductor portion having a width dimension smaller than that of the wide portion,
In the plurality of connection terminals, the connection conductor portions are arranged at the same pitch as the conductors, and the wide portions are alternately shifted in a direction orthogonal to the arrangement direction and arranged in a staggered manner with a gap therebetween,
The connection electrode and the connection conductor portion of the connection terminal are conductively connected via a conductive paste,
The base material and the connection base material are adhered by an adhesive,
The connection electrode and the connection conductor portion are in contact with the conductive paste within a range of its width dimension or less,
A part of the adhesive is in contact with a portion of the connection electrode and the connection conductor portion where the conductive paste is not applied.

  In the flat cable of the present invention, it is preferable that a part of the adhesive is filled between the connection electrode and the connection terminal, and the connection electrode and the connection terminal are bonded with the adhesive. .

  The flat cable of this invention WHEREIN: It is preferable that the said connection base material is transparent.

  The flat cable of this invention WHEREIN: It is preferable that the reinforcing material is affixed on the surface on the opposite side to said one surface where the said connection terminal of the said connection base material is paralleled.

  The flat cable of this invention WHEREIN: It is preferable that the said base material is a reinforcing material and the said reinforcing material has covered the edge part of the said connection electrode, and the edge part of the said electrically conductive paste.

According to the flat cable of the present invention, the connection terminal of the connection member has a wide portion formed with a width dimension larger than that of the conductor, and the wide portion is alternately shifted in a direction orthogonal to the arrangement direction so that there is no gap between them. Since the openings are arranged in a staggered pattern, even if the pitch of the conductors is narrow, the connector terminals can be reliably brought into contact with the wide portions of the connection terminals to be conducted.
This makes it possible to increase the reliability of electrical connection while reducing costs as much as possible compared to a flat cable with a highly precise arrangement of conductors with complex shapes to ensure reliable continuity with the connection terminals of the connector. it can.

  Moreover, since the connection electrode and the connection terminal are electrically connected via the conductive paste, there is no electrical connection failure with the connection member in the connection portion. Adhesive agent is filled in a portion where there is no conductive paste between the connection electrode and the connection terminal, and the connection electrode and the connection terminal are adhered to each other, whereby the adhesion becomes stronger.

It is a top view which shows one Embodiment of a flat cable. It is a sectional side view of a flat cable. It is a sectional side view in the end of a flat cable. It is a cross-sectional view at one end of the flat cable. It is A arrow directional view in FIG. It is a top view of a connection member. It is a sectional side view of the other example of the connection part of a flat cable and a connector. It is a sectional side view of the other example of the connection part of a flat cable and a connector. It is a perspective view explaining the manufacturing method of a flat cable. It is a top view of the elongate flat cable in the middle of manufacturing a flat cable. It is a top view of the flat cable in the middle of manufacture. It is a sectional side view of the flat cable in the middle of manufacture. It is a sectional side view of the flat cable in the middle of manufacture by a different manufacturing method. It is a sectional side view of the flat cable in the middle of manufacture by a different manufacturing method. It is a sectional side view in the end of the flat cable in the middle of manufacture. It is a cross-sectional view in the end of the flat cable in the middle of manufacture. It is a cross-sectional view explaining the transfer process of the electrically conductive paste and adhesive agent to a flat cable. It is a cross-sectional view explaining the transfer process of the electrically conductive paste and adhesive agent to a flat cable. It is a cross-sectional view of the connection part explaining the connection of the connection member to a flat cable. It is side sectional drawing of the connection part explaining the connection of the connection member to a flat cable. It is a figure which shows the conductor paste and adhesive agent in the connection location of a connection electrode and the connection conductor part of a connection terminal, Comprising: (a) And (b) is an expanded sectional view, respectively. It is a top view explaining the manufacturing method of a connection member. It is a sectional side view of the flat cable of another structure. It is a sectional side view in the end of the flat cable of another structure. It is a sectional side view in the end of the flat cable of the other structure which affixed the reinforcing material on the edge part. It is a sectional side view of the other example of the connection part of a flat cable and a connector. It is a sectional side view of the other example of the connection part of a flat cable and a connector.

Hereinafter, an example of an embodiment of a flat cable according to the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the flat cable 1 includes a plurality of flat conductors 2 made of, for example, rolled copper foil of copper (including plated copper) or 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. This flat cable 1 is a narrow cable having a narrow pitch with a parallel pitch of flat conductors 2 of 0.3 mm or less. In this example, the width of the flat conductor 2 is 0.2 mm and the parallel pitch is 0.3 mm. It is said that.

  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. Moreover, the width dimension, thickness dimension, and parallel pitch of the flat conductor 2 are set according to the current value and the like.

  The insulating films 3a and 3b are made of a base material portion formed from a resin such as polyethylene terephthalate, polyester, polyimide or polyphenylene sulfide, and a polyester adhesive or a flame retardant polyvinyl chloride insulating adhesive or a flame retardant polyolefin. It has an adhesive layer. 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 FIGS. 1 to 4, connecting members 21 are connected to the flat cable 1 at both ends in the longitudinal direction of the flat cable 1.
At the end portion (connecting portion) 11 of the flat cable 1, a part of the flat conductor 2 protrudes from the insulating films 3a and 3b. These protruding rectangular conductors 2 serve as connection electrodes 12. At the end 11, a reinforcing base material (base material) 14 is attached to the connection electrode 12 from one side of the arrangement surface thereof, whereby the connection electrode 12 of the flat conductor 2 is arranged in parallel on the reinforcing base material 14. Has been placed. An adhesive is applied to the reinforcing base material 14 on the side attached to the end portion 11. Thereby, the reinforcing base 14 is bonded to the end of one insulating film 3a and the connection electrode 12. The reinforcing base material 14 is formed from an insulating resin such as polyethylene terephthalate, and the thickness is preferably 0.03 mm or more and 0.30 mm or less. A transparent resin is used as the insulating resin constituting the reinforcing substrate 14. Thereby, the reinforcement base material 14 is made transparent. A polyester adhesive is used as the adhesive applied to the reinforcing substrate 14.

  A connecting member 21 is connected to the end portion 11. The connection member 21 is made of, for example, a flat cable, a flexible printed circuit board, a hard circuit board, or the like, and includes a connection base material 22 formed of an insulating material and a plurality of connection terminals 23 provided on the connection base material 22. And.

  As shown in FIGS. 5 and 6, the connection terminal 23 is made of copper foil, and the surface thereof is plated with tin or gold. These connection terminals 23 have linear connection conductor portions 24 and wide portions 25.

  The connection conductor portion 24 has a width dimension W 4 that is substantially the same as the width dimension W 1 of the connection electrode 12, and the pitch of the arrangement is also the same as the pitch of the connection electrode 12. That is, in this example, the connecting conductor portion 24 has a width dimension of 0.2 mm and a parallel pitch of 0.3 mm.

  The wide portion 25 has a width dimension W3 that is larger than the width dimension W4 of the connection conductor portion 24. In addition, the positions of the wide portions 25 are alternately shifted in the direction orthogonal to the arrangement direction, whereby the wide portions 25 are staggered on the connection base material 22 with a gap therebetween. Is arranged. A connection conductor portion 24 adjacent to a wide portion 25 of a connection conductor portion 24 has a narrow width at a portion adjacent to the wide portion 25.

  The connection member 21 has an adhesive portion 21a connected to the end portion 11 and an insertion / extraction portion 21b inserted / extracted into / from the connector 27, and the wide portion 25 is disposed in the insertion / extraction portion 21b.

  The connection member 21 has the bonding portion 21 a superimposed on the end portion 11, whereby the connection electrode 12 and the connection conductor portion 24 of the connection terminal 23 are electrically connected by the conductive paste 15 and connected to the reinforcing base material 14. The substrate 22 is bonded to the base material 22 with the adhesive 16. The conductive paste 15 is applied such that the width dimension W2 in the arrangement direction of the connection electrode 12 and the connection conductor portion 24 is smaller than the width dimensions W1 and W4 of the connection electrode 12 and the connection conductor portion 24. Thereby, the conductive paste 15 is not applied to the end portions (the shoulder portions 12a and 24a) in the width direction of the connection electrode 12 or the connection conductor portion 24. A part of the adhesive 16 reaches the shoulders 12a and 24a where the conductive paste 15 is not applied. Thereby, the part which the connection electrode 12 and the connection conductor part 24 contact with an electrically conductive paste becomes the range below each width dimension. Then, the adhesive 16 is filled between the connection electrodes 12 and between the connection conductor portions 24 so that they are not short-circuited via the conductive paste 15.

  In addition, as shown in FIG. 7, the reinforcement material 14 is stuck over the connection member 21 from the insulating film 3a, and the edge part of the connection electrode 12 and the edge part of the electrically conductive paste 15 are covered with the reinforcement material 14, and they are protected. May be. Thereby, peeling of the conductive paste 15 can be prevented.

  Further, as shown in FIG. 8, the reinforcing member 14 may be attached to the connecting member 21. The thickness of the reinforcing member 14 is adjusted so that the thickness of the connection member 21 matches the thickness of the opening of the connector 27. As a result, the connecting member 21 is securely fitted to the connector 27.

  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.

  Further, as the adhesive 16, for example, a polyester-based or polyamide-based 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.

  In the flat cable 1 according to the above embodiment, as shown in FIGS. 3 and 5, the insertion / extraction portion 21 b of the connection member 21 connected to the end portion 11 is inserted into the connector 27, whereby the housing 27 of the connector 27 is inserted. The accommodated connection terminal 29 is brought into pressure contact with the wide portion 25 constituting the connection terminal 23 of the connection member 21 and is conducted. Similarly to the wide portion 25 of the connection terminal 23, the connector 27 is alternately staggered in the direction orthogonal to the arrangement direction and arranged in a staggered manner.

  When the connection member 21 is inserted and connected to the connector 27, the connection terminal 23 of the connection member 21 has a wide portion 25 formed in a width dimension W3 larger than the flat conductor 2 in a direction orthogonal to the arrangement direction. Since the flat conductors 2 of the flat cable 1 are arranged in a staggered manner with a gap therebetween, even if the pitch of the flat conductors 2 is a narrow pitch of 0.3 mm or less, the connection terminals 29 of the connector 27 are The connection terminal 23 can be brought into electrical contact with the wide portion 25 with certainty.

  Further, when a part of the adhesive 16 is filled between the connection electrode 12 and the connection conductor portion 24 of the connection terminal 23, the shoulder portion 12a without the conductive paste 15 of the connection electrode 12 and the connection conductor portion 24, Since 24a is adhere | attached with the adhesive agent 16, the adhesion defect of the flat cable 1 and the connection member 21 can be eliminated.

The connection terminal 23 of the connection member 21 is preferably plated with gold. If the connection terminal 23 is gold-plated, it is possible to prevent the occurrence of needle-like crystals (whiskers) at the contact point between the connection terminal 29 of the connector 27 and the wide portion 25 of the connection terminal 23. Connection reliability can be further increased.
Moreover, in the flat cable 1 of this embodiment, since only the connection terminal 23 of the connection member 21 can be gold-plated, waste due to gold-plating the flat conductor 2 of the flat cable 1 is eliminated, and further cost reduction is achieved. Can do.

Next, a method for manufacturing the flat cable 1 having the above structure will be described.
As shown in FIG. 9, the rectangular conductors 2 are sent 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. The long insulating films 3a and 3b are fed from the reel 31 to the front and back surfaces of the flat conductors 2 and passed between the heater rollers 32. The insulating films 3a and 3b are heated and simultaneously pressed and bonded together. Measure flat cable. The long flat cable is wound around the winding roller 33. The window part 35 is formed in a part of the longitudinal direction of the insulating film 3b. You may form the window part 35 also in the insulating film 3a.

  Next, as shown in FIG. 10, in order to remove excess portions (portions called ears) in the width direction of the insulating films 3a and 3b, the insulating films 3a and 3b are cut at a position indicated by a chain line C1 of the 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 C <b> 2 passing through the center of the window portion 35 to obtain a flat cable 1 having a predetermined length. At the end of the flat cable 1, the flat conductor 2 is exposed and becomes a connection electrode 12.
When the insulating film 3a, 3b is provided with a window portion 35 and bonded so that the respective window portions 35 coincide with each other, the flat conductor 2 is exposed at the end portion of the flat cable 1 thus formed. As shown in FIGS. 11 and 12, the flat cable 1 cut into individual pieces is exposed to the flat conductors 2 at both ends to form connection electrodes 12.

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

  In this case, as shown in FIG. 13, the insulating films 3a and 3b in the vicinity of both ends of the flat cable 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.

  When the flat conductor 2 is exposed, as shown in FIGS. 15 and 16, the reinforcing base material 14 is affixed to one surface at both ends of the flat cable 1.

  Thus, after the reinforcing base material 14 is attached, the conductive paste 15 is applied to the connection electrode 12 made of the flat conductor 2 from above, and the adhesive 16 is applied to both sides of the connection electrode 12 of the reinforcing base material 14. Apply. The conductive paste 15 and the adhesive 16 can be applied by direct printing or applied to the connection 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 flat cable 1 will be described.
As shown in FIG. 17, 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 the conductive paste 15 of the release film 51. A transfer film 52 in which the adhesive 16 is applied to the side portions of is prepared.

  The transfer film 52 is superposed on the connecting portion 11 of the flat cable 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. As a result, the top of the conductive paste 15 is pressed against the connection electrode 12 and is crushed and flattened. Also, the adhesive 16 on the transfer film 52 side is softened by heat and peeled off from the release film 51 to be flat cable. 1 on the reinforcing substrate 14 or the connection electrode 12.

  After performing the transfer press in this way, the flat cable 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 provided on the connection electrode 12 so as to protrude in the direction opposite to the reinforcing base material 14, and a part of the adhesive 16 is also disposed on the shoulder 12 a of the connection electrode 12. A flat cable 1 is obtained.

  At this time, since the reinforcing base material 14 is affixed to one surface of the connection electrode 12, the conductive base material 15 and the adhesive 16 are applied with the reinforcing base material 14 disposed on the lower side. Thus, the conductive paste 15 and the adhesive 16 are prevented from flowing down.

  Next, the connection member 21 is connected to the connection portion 11 of the flat cable 1. The connection member 21 includes a connection base material 22 and a plurality of connection terminals 23 bonded to the connection base material 22. The connection terminal 23 has a connection conductor part 24 and a wide part 25, and the connection conductor part 24 is arranged at the same pitch with substantially the same width as the connection electrode 12 of the flat cable 1. The connection terminal 23 of the connection member 21 is preferably plated with gold.

  As shown in FIGS. 19 and 20, the bonding portion 21 a of the connection member 21 is overlapped with the connection portion 11 of the flat cable 1. The connection electrodes 12 are overlapped so as to be completely covered with the connection terminals 23. The connection electrode 12 and the connection conductor portion 24 are electrically connected by the conductive paste 15, and the reinforcing base material 14 and the connection base material 22 are bonded by the adhesive 16. Further, a part of the adhesive 16 is spread between the connection electrode 12 and the connection conductor portion 24, whereby the connection electrode 12 and the connection conductor portion 24 are bonded by the adhesive 16.

  When bonding the connection member 21 to the connection portion 11 of the flat cable 1, first, as shown in FIG. 21A, first, the connection conductor portion 24 of the connection member 21 is applied to the conductive paste 15 protruding from the adhesive 16. Abuts to ensure electrical connection between the connection electrode 12 and the connection conductor portion 24. Further, when the connecting member 21 is pressed against the connecting portion 11 of the flat cable 1, the conductive paste 15 is sandwiched and crushed by the connecting electrode 12 and the connecting conductor portion 24 as shown in FIG. As a result, the conductive paste 15 is in good contact with the connection conductor portion 24. At this time, since the width dimension W2 of the conductive paste 15 is smaller than the width dimension W1 of the connection electrode 12 and the connection conductor portion 24 (see FIG. 4), even if the conductive paste 15 is crushed and spread sideways. Even if it is within the range of the width of the adjacent connection electrodes 12 or the adjacent connection conductor portions 24 or protrudes to some extent, it is pressed into the adhesive 16 and does not reach the adjacent connection electrode 12 or the connection terminal 23. That is, the trouble that the conductive paste 15 short-circuits between the adjacent connection electrodes 12 or between the adjacent connection terminals 23 is also prevented.

  The adhesive 16 enters between the connection conductor portions 24 of the connection member 21 and contacts the connection base material 22 of the connection member 21. As a result, the connection member 21 is connected to the flat cable 1 satisfactorily without defects such as adhesion failure and short circuit.

  When the reinforcing substrate 14 is transparent, when connecting to the connection member 21, it is preferable to overlap the connection member 21 so as to cover the flat cable 1 from above. If it does in this way, the position of the connection electrode part 12 and the connection conductor part 24 of the connection terminal 23 from the upper side through the transparent reinforcement base material 14 of the flat cable 1 is visually observed or the image data is automatically judged by the electronic device. Can be combined.

  Further, in the above-described pasting step, the conductive paste 15 and the adhesive 16 are applied to the connection portion 11 of the flat cable 1 and the connection member 21 is laminated and bonded to the connection portion 11. The paste 15 and the adhesive 16 may be applied, and the connection portion 11 of the flat cable 1 may be overlapped and bonded to the connection member 21. The method for transferring the conductive paste 15 and the adhesive 16 to the connecting member 21 is the same as described above. When applying the conductive paste 15 and the adhesive 16 to the connection member 21, it is preferable to make the connection base material 22 transparent because the alignment between the connection electrode 23 and the connection terminal 12 is easy.

  In order to fabricate the connection member 21 from a flexible printed circuit board or a hard substrate, as shown in FIG. 22, the connection conductor portion 24 and the connection conductor portion 24 and the substrate 60 formed of an insulating material to be the connection base material 22 are etched. A conductor pattern to be the connection terminal 23 having the wide portion 25 may be formed, and then the substrate 60 may be cut into a plurality of connection members 21. Note that when the connection terminal 23 is subjected to a plating process such as gold plating, it is preferably performed before cutting. As described above, when the conductor pattern is formed on the substrate 60 by etching or the like, the connection terminal 23 having a complicated and precise shape can be easily formed with high accuracy.

  In the above-described embodiment, the reinforcing base 14 is attached to one surface of the flat conductor 2 whose front and back surfaces are exposed by removing the insulating films 3a and 3b at the end portions. As shown in FIG. 23 and FIG. 24, only the other insulating film 3 b may be removed to expose the flat conductor 2 to form the connection electrode 12. In this case, one insulating film 3a from which the end portion is not removed serves as a base material. In this case, when a transparent film is used as at least the insulating film 3a serving as the base material, the position of the connecting electrode 12 and the connecting conductor portion 24 of the connecting terminal 23 through the insulating film 3a when connecting to the wiring member 21 to be connected. The alignment can be performed easily and with high accuracy. Alternatively, by making the connection base material 22 of the connection member 21 transparent, the connection conductor 24 of the connection terminal 23 and the connection electrode 12 can be easily aligned through the connection member 21 without making the insulating film 3a transparent. It can also be performed with high accuracy.

  Moreover, as shown in FIG. 25, the connection part 11 may be reinforced by sticking the reinforcing material 61 on the outer surface side of the insulating film 3a. If the connection portion 11 is reinforced by the reinforcing member 61, the connection portion 11 can be prevented from being deformed when inserted into the connector 27. As the reinforcing material 61, for example, a material formed from a transparent insulating resin made of polyethylene terephthalate, polyester or the like is used. Moreover, a polyester-based adhesive is used as an adhesive to be bonded to the insulating film 3a.

  In addition, as shown in FIG. 26, the reinforcing material 14 is pasted on the insulating film 3a and the connecting member 21, and the reinforcing material 14 covers the ends of the connection electrodes 12 and the conductive paste 15 to protect them. Also good. Thereby, peeling of the conductive paste 15 can be prevented. As the reinforcing material 14, for example, an insulating resin film made of polyethylene terephthalate, polyester or the like is used. Moreover, a polyester-based adhesive is used as an adhesive to be bonded to the insulating film 3a. If the insulating film 3a, the reinforcing material 14, and the adhesive are transparent, each connection electrode 12 can be seen through, and the alignment between each connection electrode 12 and each connection terminal 23 can be facilitated.

  In addition, as shown in FIG. 27, the reinforcing member 14 may be attached to the connecting member 21. The thickness of the reinforcing member 14 is adjusted so that the thickness of the connection member 21 matches the thickness of the opening of the connector 27. As a result, the connecting member 21 is securely fitted to the connector 27.

1: flat cable, 2: flat conductor (conductor), 3a: insulating film (base material), 3b: insulating film, 11: connection portion, 12: connection electrode, 14: reinforcing base material (base material), 15: conductive Adhesive paste, 16: adhesive, 21: connecting member, 22: connecting base material, 23: connecting terminal, 24: connecting conductor part, 25: wide part, W1, W2, W3, W4: width dimension

Claims (5)

A flat cable in which an insulating film is bonded to a plurality of conductors arranged on a plane from both sides of the arrangement surface, and a connection member is attached to an end portion, and one end surface of the conductor at the end portion Is covered with a base material, the other side surface is not covered with the insulating film and is a connection electrode,
The conductors are juxtaposed at a pitch of 0.3 mm or less,
The connection member includes a connection base material made of an insulating material, and a plurality of connection terminals arranged in parallel on one surface of the connection base material,
The connection terminal includes a wide portion having a width dimension larger than that of the conductor, and a connection conductor portion having a width dimension smaller than that of the wide portion,
In the plurality of connection terminals, the connection conductor portions are arranged at the same pitch as the conductors, and the wide portions are alternately shifted in a direction orthogonal to the arrangement direction and arranged in a staggered manner with a gap therebetween,
The connection electrode and the connection conductor portion of the connection terminal are conductively connected via a conductive paste,
The base material and the connection base material are adhered by an adhesive,
The connection electrode and the connection conductor portion are in contact with the conductive paste within a range of its width dimension or less,
A part of the adhesive is in contact with a portion of the connection electrode and the connection conductor portion where the conductive paste is not applied. The flat cable according to claim 1,
Part of the adhesive is filled between the connection electrode and the connection terminal, and the connection electrode and the connection terminal are bonded with the adhesive. The flat cable according to claim 1 or 2,
The flat cable, wherein the connection base is transparent. A flat cable according to any one of claims 1 to 3,
A flat cable, wherein a reinforcing material is attached to a surface opposite to the one surface where the connection terminals of the connection base material are arranged in parallel. A flat cable according to any one of claims 1 to 4,
The flat cable, wherein the base material is a reinforcing material, and the reinforcing material covers an end portion of the connection electrode and an end portion of the conductive paste.

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