JP2013020949A - Flat cable and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide flat cables having different lengths at low cost.SOLUTION: In a flat cable, a connection member 21 includes: a connection base material 22; and a plurality of connection terminals 23 arranged on one face of the connection base material 22 in parallel. A connection electrode 12 and the connection terminals 23 are conductively connected via a conductive paste 15, a reinforcement base material 14 and the connection base material 22 are bonded by an adhesive 16, the connection electrode 12 and the connection terminals 23 are in contact with the conductive paste 15 in a region narrower than the width dimension of the connection electrode and the connection terminals, and a part of the adhesive 16 is in contact with a part where the connection electrode 12 and the connection terminals 23 are not coated with the conductive paste 15.

Description

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

  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).

JP 2003-208821 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.

  By the way, in the above flat cable, a window portion is provided at a predetermined interval on at least one side of the insulating tape sandwiching the conductor, and the conductor and the insulating tape are cut at this window portion, so that the conductor is exposed at the end portion. The connection electrode portion thus formed was formed. However, in this method, the length of the desired flat cable must be determined in advance, and the interval between the windows provided on the insulating tape must be determined according to the length of the flat cable. For this reason, in order to create various types of flat cables having different lengths, it is necessary to prepare insulating tapes having different window intervals for each type, which increases the manufacturing cost.

  In addition, when the connection terminal of the connector is pressed against the connection electrode portion where the conductor made of tin-plated annealed copper foil is exposed, a needle-like crystal is formed on the surface of the connection electrode portion due to receiving compressive stress for electrical contact. (Whisker) may occur, and a short circuit may occur between adjacent connection electrode portions.

  In this case, if a flat cable is produced by sandwiching a gold-plated conductor with an insulating tape, whisker is prevented from being generated at the connection electrode portion made of the conductor exposed at the end, and electrical connection with the connector is prevented. Reliability can be improved. However, when the entire length of the conductor is gold-plated and then laminated with an insulating film, the gold plating is applied to a portion other than the portion connected to the connector. When the insulation film is bonded to the front and back of the conductor and the flat cable with a part of the conductor exposed is immersed in the plating bath and the conductor exposed part is gold-plated, it is necessary to supply the flat cable of the part that is not gold-plated. Cost increase was unavoidable because gold plating could not be performed efficiently due to the long processing time.

  An object of the present invention is to provide flat cables having different lengths at a low cost.

In the flat cable of the present invention capable of solving the above-described problems, an insulating film is bonded to a plurality of conductors arranged on a plane from both sides of the arrangement surface, and the conductors are transferred from the insulating film on the front and back at least at one end. It is a connection cable that protrudes to be a connection electrode, a base material is attached to the connection electrode from one surface side to be a connection part, and a connection member is attached to the connection part, a flat cable,
The connection member includes a connection base material, and a plurality of connection terminals arranged in parallel on one surface of the connection base material,
The connection electrode and the connection terminal are conductively connected through a conductive paste,
The base material and the connection base material are adhered by an adhesive,
The connection electrode and the connection terminal are in contact with the conductive paste within a range of its width dimension,
A part of the adhesive is in contact with a portion of the connection electrode and the connection terminal 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 base material has covered the edge part of the said connection electrode, and the edge part of the said electrically conductive paste.

  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.

  In the flat cable of the present invention, the plurality of connection terminals may be plated with gold.

  The flat cable of this invention WHEREIN: The said connection member may be affixed on the position which straddles the boundary part which the said conductor protruded from the said insulating film.

The flat cable manufacturing method of the present invention is
Affixing an insulating film from both sides of the arrangement surface to a plurality of conductors arranged on a plane,
At least one end protrudes the conductor from the insulating film on the front and back to form a connection electrode,
A base material is pasted from one side of the connection electrode to form a connection portion, and a connection member in which a plurality of connection terminals are arranged in parallel on one surface of the connection base material is prepared,
The connection member and the connection portion are overlapped so that the connection terminal and the connection electrode are conductively connected via a conductive paste, and the insulating film and the connection base are connected via an adhesive. It is characterized by sticking together.

In the method for producing a flat cable of the present invention,
The conductive paste is applied to the connection electrode in a range narrower than its width dimension, the adhesive is applied to the side of the connection electrode of the base material, and the connection member and the connection portion are overlapped. You may paste.

In the method for producing a flat cable of the present invention,
The conductive paste is applied to the connection terminal in a range narrower than its width dimension, the adhesive is applied to the side of the connection terminal of the connection base material, and the connection member and the connection portion are overlapped. You may paste together.

  In the flat cable manufacturing method of the present invention, the adhesive is inserted into a portion where the conductive paste is not applied between the connection electrode and the connection terminal, and the connection electrode and the connection terminal are bonded together. It is preferable to adhere by an agent.

  In the flat cable manufacturing method of the present invention, it is preferable that the substrate is pasted so as to cover an end portion of the connection electrode and an end portion of the conductive paste.

  In the flat cable manufacturing method of the present invention, it is preferable that a reinforcing material is attached to a surface of the connection base opposite to the one surface where the connection terminals are arranged in parallel.

  In the flat cable manufacturing method of the present invention, it is preferable that the plurality of connection terminals are plated with gold.

  In the flat cable manufacturing method of the present invention, the connection member may be attached to a position where the conductor straddles a boundary portion protruding from the insulating film.

  The connection member is affixed on the connection part which has the conductor protruded from the insulating film as a connection electrode at the edge part of the flat cable of this invention. For this reason, what bonded the insulation film to the conductor can be cut into desired length, and a connection member can be stuck on the edge. Therefore, since a flat cable having a desired length can be freely created, various types of flat cables having different lengths can be provided at low cost.

  In addition, since the connection electrode and the connection terminal are conducted through the conductive paste, there is no conduction failure, and a portion where there is no conductive paste between the connection electrode and the connection terminal is filled with an adhesive, There is no adhesion failure because the connection terminal is bonded.

  According to the flat cable manufacturing method of the present invention, it is possible to create a desired length by attaching an insulating film to a plurality of conductors, so that flat cables having different lengths can be manufactured at low cost. .

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 side sectional drawing of the connection part of a flat cable and a connector. It is a cross-sectional view at one end of the flat cable. 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 sectional side view of the other example of the connection part of a flat cable and a connector. It is a top 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 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. It is a top view of the flat cable in the middle of manufacture. 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 a connection terminal, Comprising: (a) And (b) is an expanded sectional view, respectively. It is a perspective view explaining the preparation methods of a connection member. It is a perspective view explaining the other manufacturing methods of a connection member. It is a top view explaining the manufacturing method of a connection member. It is side sectional drawing of the flat cable in the middle of manufacture by a different manufacturing method, (a) is a mode before sticking the connection member with which the electrically conductive paste and the adhesive agent were apply | coated, (b) is a reinforcement base material and a protective film The state of pasting is shown. It is a top view of the flat cable which shows a mode that a conductive paste and an adhesive agent are apply | coated to a connection member.

Hereinafter, an example of an embodiment of a flat cable and a manufacturing method thereof 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. 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 3, connecting members 21 are connected to the flat cable 1 at both ends in the longitudinal direction of the flat cable 1.
In the connection part (end part) 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. In the connection portion 11, a reinforcing base material (base material) 14 is attached to the connection electrode 12 from one of the arrangement surfaces. Thereby, the connection electrode 12 of the flat conductor 2 is arranged in parallel on the reinforcing base material 14. An adhesive is applied to the reinforcing base 14 on the side to be bonded to the connection portion 11. Thereby, this reinforcement base material 14 is adhere | attached on the edge part of one insulating film 3a, and the connection electrode 12. FIG. 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 base 14, and thus the reinforcing base 14 is transparent. A polyester adhesive is used as the adhesive applied to the reinforcing substrate 14.

  As shown in FIGS. 3 and 4, a connection member 21 is connected to the connection portion 11 of the flat cable 1. 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. In the connection member 21 made of a flat cable, as the connection base material 22, for example, a film made of polyethylene terephthalate (PET) having a thickness of about 0.25 mm and a polyester adhesive applied to a thickness of about 0.03 mm. Used. The connection terminals 23 are arranged at the same pitch with substantially the same width W1 as the connection electrodes 12 of the connection part 11. These connection terminals 23 are made of copper or a copper alloy rolled copper foil, and the surface thereof is plated with gold.

  The connection member 21 is superimposed on the connection portion 11 of the flat cable 1, whereby the connection electrode 12 and the connection terminal 23 are electrically connected by the conductive paste 15, and the insulating film 3 a and the connection base material 22 are bonded. Bonded by the agent 16. The conductive paste 15 is applied such that the width dimension W <b> 2 in the arrangement direction of the connection electrodes 12 and the connection terminals 23 is smaller than the width dimension W <b> 1 of the connection electrodes 12 and the connection terminals 23. Thereby, the conductive paste 15 is not applied to the end portions (shoulder portions 12a and 23a) of the connection electrode 12 or the connection terminal 23 in the width direction. Part of the adhesive 16 also reaches the shoulder 12a or 23a where the conductive paste 15 is not applied. Thereby, the part which the connection electrode 12 and the connection terminal 23 contact with the electrically conductive paste 15 becomes the range below each width dimension. Then, the adhesive is filled between the connection electrodes 12 and between the connection terminals 23 so that they are not short-circuited via the conductive paste 15.

  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, polyamide-based hot melt adhesive or a thermosetting 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 embodiment, as shown in FIG. 3, the connection terminal 29 accommodated in the housing 28 of the connector 27 is inserted by inserting the connection member 21 connected to the connection portion 11 into the connector 27. The connection member 21 is brought into pressure contact with the connection terminal 23 to conduct.

  In this flat cable 1, since the connection terminal 23 of the connection member 21 is gold-plated, a needle-like crystal (whisker) is formed on the surface of the connection terminal 23 even if it receives compressive stress from the connection terminal 29 of the connector 27. Therefore, there is no problem that a short circuit occurs between adjacent connection terminals 23. That is, the reliability of electrical connection with the connector 27 is good.

Conventionally, the connection electrode itself which consists of a part of flat conductor exposed at the both ends of the flat cable was gold-plated.
Such a flat cable can be made by bonding an insulating film on the front and back of a flat conductor with gold plating. Alternatively, the flat cable can be dipped in a plating tank and the connection electrode can be plated with gold. In the former case, the gold plating in the portion of the flat conductor sandwiched between the insulating films is wasted. In the latter case, it takes extra time to supply the flat cable of the portion not plated with gold to the plating tank.

  On the other hand, according to the flat cable 1 according to the present embodiment, since the connection member 21 having the connection terminal 23 plated with gold is connected to the flat cable 1, only the connection terminal 23 can be efficiently gold-plated. Thereby, the reliability of electrical connection can be maintained, suppressing cost as much as possible. Of course, when it is not required that whiskers are not generated in the flat cable 1, tin plating or the like may be applied to the connection terminals 23 instead of gold plating.

  When a part of the adhesive 16 is filled between the connection electrode 12 and the connection terminal 23, the shoulders 12 a and 23 a without the conductive paste 15 of the connection electrode 12 and the connection terminal 23 are bonded to each other by the adhesive 16. Therefore, the adhesion failure between the flat cable 1 and the connection member 21 can be eliminated.

  In addition, as shown in FIG. 5, the reinforcement material 14 is stuck over the connection member 21 from the insulating film 3a, the edge part of the connection electrode 12 and the edge part of the electroconductive 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.

  In addition, as shown in FIG. 6, the reinforcing member 14 may be attached to the connection 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.

  Further, the boundary between the area where the flat conductor 2 is covered with the insulating films 3a and 3b and the area where the flat conductor 2 is exposed from the insulating films 3a and 3b (the boundary portion where the flat conductor 2 protrudes from the insulating films 3a and 3b). B is easy to bend due to external force. For this reason, as shown in FIG. 7, the connection member 21 may be attached to a position across the boundary B, and the boundary B may be protected by the connection member 21. In this case, it is preferable to apply the conductive paste 15 and the adhesive 16 to the connection member 21 and then attach the connection member 21.

  Furthermore, as shown in FIG. 7, in order to prevent the connection part 11 and the connection member 21 from peeling from the end part, an adhesive 16 may be applied to each end part. Further, the protective film 17 may be attached to the end of the connecting member 21 on the flat cable 1 side to prevent the end of the connecting end 21 from being peeled off more firmly.

  When a flexible printed circuit board is employed as the connecting member 21, a material obtained by bonding a PET film to a base film made of polyimide or a polyester film can be employed as the connecting base material 22. A connection member 21 having a copper foil bonded to the connection base material 22 as a connection terminal 23 and further plated with gold can be used as the connection member 21.

  Furthermore, when a flexible printed circuit board having a base film made of polyimide is employed as the connection member 21, a thermosetting adhesive may be used as an adhesive for bonding the base film and the copper foil (connection terminal 21). preferable. As described above, when connecting the connection member 21 to the connection portion 11, the connection member 21 is bonded to the connection portion 11 while heating. At this time, since the thermosetting adhesive does not soften, the connection terminal 23 does not sink into the thermosetting adhesive, and the connection terminal 23 supported by the thermosetting adhesive is pressed against the conductive paste 15. The connection electrode 12 of the connection portion 11 can be reliably conducted.

  Further, as shown in FIG. 8, the connection member 21 is also a pitch conversion type connection member 21 formed so that the pitch of the connection terminals 23 is converted in the middle of the flat cable 1 side to the connector 27 side. Good. Thereby, even when the parallel pitch of the flat conductors 2 of the flat cable 1 and the pitch of the terminals of the connector 27 are different, the flat cable 1 and the connector 27 can be electrically connected. In FIG. 8, an example in which the pitch is narrowed from the flat cable 1 to the connecting member 21 is illustrated, but the pitch may be widened from the flat cable 1 to the connecting member 21.

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. When a large number of flat cables 1 having the same length are to be produced, the insulating films 3a and 3b having windows formed in a part in the longitudinal direction are bonded and flattened so that the windows coincide with each other. A cable may be created. In this case, the window portion of the flat cable 1 becomes the connection portion 11.

  The long flat cable thus obtained is cut to a desired length. Further, as shown in FIG. 10, 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 or a laser. Cut with a cutter 37. Further, as shown in FIG. 11, the insulating films 3a and 3b on the end side from the cut portion are pulled out and removed, and the flat conductor 2 is exposed at both ends of the flat cable 1 as shown in FIG. And

  When the flat conductor 2 is exposed, as shown in FIG. 13 and FIG. 14, the reinforcing base material 14 is affixed to one surface at both ends of the flat cable 1. When 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. 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. 15, a conductive paste 15 is applied at a predetermined pitch to a transfer release film 51 formed of 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 terminals 23 are arranged at substantially the same width and the same pitch as the connection electrodes 12 of the flat cable 1 and are plated with gold.

  As shown in FIGS. 17 and 18, 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 terminal 23 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. A part of the adhesive 16 spreads between the connection electrode 12 and the connection terminal 23, and the connection electrode 12 and the connection terminal 23 are bonded by the adhesive 16.

  In addition, when the reinforcement base material 14 is transparent, when connecting the flat cable 1 and the connection member 21, it is preferable to overlap | superpose so that the flat cable 1 may be covered with this connection member 21 from upper direction. If it does in this way, the position of the connection electrode 12 and the connection terminal 23 can be visually observed and aligned through the transparent reinforcement base material 14 of the flat cable 1 from the upper side.

  When bonding the connection member 21 to the connection portion 11 of the flat cable 1, first, as shown in FIG. 19A, the connection terminal 23 of the connection member 21 is first attached to the conductive paste 15 protruding from the adhesive 16. The contact is ensured between the connection electrode 12 and the connection terminal 23. Further, when the connecting member 21 is pressed against the connecting portion 11 of the flat cable 1, the conductive paste 15 is sandwiched between the connecting electrode 12 and the connecting terminal 23 and crushed as shown in FIG. As a result, the conductive paste 15 is in good contact with the connection terminal 23. 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 terminal 23 (see FIG. 4), even if the conductive paste 15 is crushed and spread to the side, Even if it is within the range of the width of the connection electrode 12 or the connection terminal 23 or slightly protrudes, it is pressed into the adhesive 16 and does not reach the adjacent connection electrode 12 or 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.

  More specifically, the reinforcing base material 14 includes a base layer 14a2 and an adhesive layer 14a1 provided on the base layer 14a2. The whole is heated when the reinforcing base material 14 is bonded to the connection portion 11 of the flat cable 1. The adhesive layer 14a1 of the reinforcing base member 14 becomes soft by heating, and the conductor 12 of the connecting portion 11 sinks into the adhesive layer 14a1 under the force that the connecting member 21 is bonded. Accordingly, the adhesive 16 rises between the conductors 12 of the connection portion 11, the adhesive 16 enters between the connection terminals 23 of the connection member 21, and contacts the connection base material 22 of the connection member 21. Thereby, the connecting member 21 is connected to the flat cable 1 satisfactorily without defects such as adhesion failure and short circuit.

Next, an example of a method for producing the connection member 21 connected to the connection portion 11 of the flat cable 1 will be described.
As shown in FIG. 20, the rectangular conductors 61 are sent out from a plurality of reels 62 around which a plurality of long rectangular conductors 61 to be the connection terminals 23 are wound, and are arranged on the same plane at a predetermined parallel pitch.

  Then, an adhesive layer is stacked on one side of these flat conductors 61 from an reel 63 to an insulating film such as a polyethylene terephthalate (PET) film (for example, PET thickness 0.25 mm, adhesive layer 0.03 mm) The connecting substrate 22 having a length is fed out and passed between the heater rollers 64 to heat the connecting substrate 22 and, at the same time, pressed and pasted to the flat conductor 61 to produce a long connecting member 65, and the long connecting member 65 is wound. It is wound around a take-up roller 66.

  When the long connecting member 65 is manufactured, as shown in FIG. 21, a long release film 68 is fed from the reel 67 to the other side of the flat conductor 61 and passed between the heater rollers 64. It may be peeled off from the long connection member 65 and wound around the recovery reel 69. In this way, the adhesive does not melt and adhere to the heater roller 64 or the exposed surface of the rectangular conductor 61 between the heater rollers 64. The flat conductor 61 can be smoothly and smoothly pressed onto the connection base material 22.

  The flat conductor 61 may be gold-plated before being attached to the connection base material 22, or the conductor exposed portion is continuously formed even if it is gold-plated after being attached to the connection base material 22. Therefore, it is possible to perform gold plating continuously and efficiently.

  Thereafter, as shown in FIG. 22, the long connection member 65 is cut by a cutter every predetermined length to obtain the connection member 21.

  Note that the above-described method for manufacturing the connecting member 21 is an example, and other manufacturing methods may be used. For example, when the connection member 21 is manufactured from a flexible printed board or a hard board, a conductor pattern to be the connection terminal 23 is formed by etching or the like, and then the conductor pattern is plated with gold.

  According to the flat cable manufacturing method of the present embodiment, the flat conductor 2 protruding from the insulating films 3a and 3b is exposed as the connection electrode 12 in the connection portion 11 at the end of the flat cable 1, and this connection is made. A connecting member 21 is attached to the portion 11. For this reason, the long flat cable which bonded the insulating films 3a and 3b to the flat conductor 2 can be cut into desired length, and the connection member 21 can be affixed to the edge part. Therefore, since the flat cable 1 having a desired length can be freely created, various types of flat cables 1 having different lengths can be provided at low cost.

  In addition, since the connection terminal 23 of the connection member 21 is gold-plated, the flat cable 1 is manufactured with high reliability of electrical connection while suppressing the cost as much as possible and having no defects such as poor adhesion with the connection member 21. Can do. In addition, the reinforcing base 14 is applied to one surface of the connection electrode 12 made of the flat conductor 2 protruding from the insulating films 3 a and 3 b, and then the conductive paste 15 is applied to the connection electrode 12. Since the adhesive 16 is applied to the side of the connection electrode 12, the conductive paste 15 and the adhesive 16 can be applied satisfactorily without flowing down, and the workability is good.

  In the manufacturing method described above, the conductive paste 15 and the adhesive 16 are applied to the connection portion 11 so that the conductive paste 15 protrudes from the adhesive 16. However, the present invention is not limited to this. It is not limited to examples.

  The adhesive 16 that could not be accommodated in the space surrounded by the reinforcing base 14, the connection base 22, the pair of adjacent connection electrodes 12, the pair of connection terminals 23, and the pair of conductive pastes 15 12 and the connection terminal 23 flow out in the longitudinal direction (left and right direction in FIGS. 1 and 2). Therefore, when the connecting member 21 is bonded to the flat cable 1, the adhesive 16 does not prevent conduction between the conductive paste 15 and the connection terminal 23.

In the above-described manufacturing method, the example in which the conductive paste 15 and the adhesive 16 are applied to the connection portion 11 of the flat cable 1 has been described. However, the present invention is not limited to this example. For example, as shown in FIG. 23A, the conductive paste 15 and the adhesive 16 may be applied to the connection member 21.
Further, as shown in FIG. 23 (b), after attaching the connection member 21 to the connection portion 11 of the flat cable 1, the reinforcing base material 14 is attached to the lower surface of the insulating film 3 a, the lower surface of the connection electrode 12, and the connection member 21. Affix it so as to straddle the lower surface. Furthermore, the protective film 17 is affixed so that the upper surface of the insulating film 3b and the upper surface of the connection member 21 may be continued. The reinforcing base material 14 can reinforce the mechanical strength of the boundary B and can prevent bending at the boundary B. Moreover, it can prevent that the edge part by the side of the flat cable 1 of the connection member 21 peels with the protective film 17. FIG.

  Further, as shown in FIGS. 23 and 24, the conductive paste 15 is not applied to the end on the flat cable 1 side, and the adhesive 16 is applied to the end on the flat cable 1 side of the connecting member 21. Is preferred. The end of the connecting member 21 on the flat cable 1 side is bonded to the upper surface of the insulating film 3b of the flat cable 1 via the adhesive 16, and the connecting member 21 can be made difficult to peel off from the flat cable 1.

  Further, when the conductive paste 15 and the adhesive 16 are applied to the connection member 21, it is preferable to make the connection base material 22 transparent because it is easy to align the connection terminals 23 and the connection terminals 12.

  A flat cable and a connecting member were prepared by the above-described manufacturing method, and a high temperature test was performed on a laminate of both. The flat cable and the connecting member were placed in a thermostat at 85 ° C. for 500 hours, and the change in resistance value was measured. As a result, the resistance value did not increase even after 500 hours. When the flat cable connection part and the connection member are exposed to high temperatures and the parts that are bonded together are separated from each other, the resistance value rises. Since this increase in resistance value was not confirmed, it was exposed to a high temperature environment. However, it was confirmed that the connecting member was securely bonded to the flat cable.

  Moreover, the high temperature high humidity test was done about the said flat cable and the connection member. The change of the resistance value of the flat cable and the connecting member was measured at 500C for 60 hours in a relative humidity of 95% RH. As a result, even after 500 hours, the increase in resistance value was less than 20 mΩ. Thereby, even if it exposed to the environment of high temperature high humidity, it was confirmed that the state by which the connection member was reliably bonded by the flat cable is maintained.

  Furthermore, the thermal shock test was done about the said flat cable and the connection member. Immediately after holding the flat cable and the connecting member at −40 ° C. for 0.5 hour, the flat cable and the connecting member were held at 85 ° C. for 0.5 hour, and this was repeated 500 cycles, and the change in resistance value was measured. As a result, even after 500 cycles, the increase in resistance value was less than 20 mΩ. Thereby, even if the thermal shock repeatedly acted, it was confirmed that the state where the connecting member was bonded to the flat cable was maintained.

  Further, a line pressure resistance test was performed on the flat cable and the connecting member. When a voltage of AC 500 V was applied to the flat cable and the connecting member for 1 minute, dielectric breakdown did not occur. Thereby, it has confirmed that the flat cable and the connection member were provided with practically sufficient line | wire pressure resistance.

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

Claims (15)

Insulating films are bonded to a plurality of conductors arranged on a plane from both sides of the arrangement surface, and the conductor protrudes from the insulating film on the front and back at least at one end to form a connection electrode. It is a flat cable in which a material is affixed to be a connection part, and a connection member is affixed to the connection part,
The connection member includes a connection base material, and a plurality of connection terminals arranged in parallel on one surface of the connection base material,
The connection electrode and the connection terminal are conductively connected through a conductive paste,
The base material and the connection base material are adhered by an adhesive,
The connection electrode and the connection terminal are in contact with the conductive paste within a range of its width dimension,
A part of the adhesive is in contact with a portion of the connection electrode and the connection terminal 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 base material covers an end portion of the connection electrode and an end portion of the conductive paste. 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,
A flat cable, wherein the plurality of connection terminals are gold-plated. A flat cable according to any one of claims 1 to 5,
The flat cable, wherein the connection member is affixed at a position straddling a boundary portion where the conductor protrudes from the insulating film. A flat cable according to any one of claims 1 to 6,
A flat cable in which pitches of the plurality of connection terminals of the connection member are converted in the middle. Affixing an insulating film from both sides of the arrangement surface to a plurality of conductors arranged on a plane,
At least one end protrudes the conductor from the insulating film on the front and back to form a connection electrode,
A base material is pasted from one side of the connection electrode to form a connection portion, and a connection member in which a plurality of connection terminals are arranged in parallel on one surface of the connection base material is prepared,
The connection member and the connection portion are overlapped so that the connection terminal and the connection electrode are conductively connected via a conductive paste, and the insulating film and the connection base are connected via an adhesive. A method for manufacturing a flat cable, characterized by being attached together. It is a manufacturing method of the flat cable according to claim 8,
The conductive paste is applied to the connection electrode in a range narrower than its width dimension, the adhesive is applied to the side of the connection electrode of the base material, and the connection member and the connection portion are overlapped. A method of manufacturing a flat cable, characterized in that it is attached. It is a manufacturing method of the flat cable according to claim 8,
The conductive paste is applied to the connection terminal in a range narrower than its width dimension, the adhesive is applied to the side of the connection terminal of the connection base material, and the connection member and the connection portion are overlapped. A method for manufacturing a flat cable, characterized by being attached together. It is a manufacturing method of the flat cable according to any one of claims 8 to 10,
A flat characterized in that the adhesive is inserted into a portion where the conductive paste is not applied between the connection electrode and the connection terminal, and the connection electrode and the connection terminal are adhered by the adhesive. Cable manufacturing method. It is a manufacturing method of the flat cable according to any one of claims 8 to 11,
A method of manufacturing a flat cable, wherein the base material is pasted so as to cover an end portion of the connection electrode and an end portion of the conductive paste. A flat cable manufacturing method according to any one of claims 8 to 12,
A manufacturing method of 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. It is a manufacturing method of the flat cable as described in any one of Claims 8-13,
A method of manufacturing a flat cable, wherein the plurality of connection terminals are plated with gold. The flat cable according to any one of claims 8 to 14,
The flat cable characterized by sticking the said connection member in the position straddling the boundary part which the said conductor protruded from the said insulating film.