JP2008226512A - Flat cable and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flat cable capable of reducing its manufacturing cost without involving complicated bonding work. <P>SOLUTION: This flat cable 1 is formed by folding a spread flexible substrate 2 in three, and the substrate is equipped with a metal layer 3 made of a conductive metal material, an adhesive layer 4 formed on the upper and lower surfaces of the metal layer by an insulating adhesive, and a conductor group 7 having a plurality of conductors 6 disposed at an almost center position in the width direction of the metal layer with prescribed intervals interposed. In concrete, the flat cable is structured so that the substrate is folded in three in a Z shape by using a position in the vicinity of the outside of both end parts of the conductor group as a folding line, and the metal layers laminated on the side opposite to the folding line in the width direction are soldered each other. Thereby, work manhours to bond the layers can be suppressed to the minimum. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a flat cable formed by laminating a plurality of plate-like members, for example, for use in electric / electronic devices and the like, and a method for manufacturing the same.

  A flat cable is a thin wiring having flexibility, and in recent years, printed wiring boards such as wiring of movable parts of electric and electronic devices, particularly wiring of print heads of ink jet printers and wiring of pickup parts of DVDs. As an alternative to the above, it is widely applied to OA equipment and AV equipment, and as a conventional flat cable, for example, one described in Patent Document 1 below has been proposed.

  This flat cable is composed of a plurality of internal conductors made of conducting wires, an insulating layer joined in parallel vertically via an adhesive layer surrounding each internal conductor, and a conductive layer provided on the outer surface side of the insulating layer. And a shield layer made of a material.

  Further, in the flat cable, a small hole is formed through any one of the internal conductors along the thickness direction of the flat cable, and a conductive material such as solder and a conductive material are formed in the small hole. The adhesive is filled.

As a result, the shield layer can be grounded easily and quickly without removing the insulating layer.
JP 2004-303696 A

  However, in the conventional flat cable, each member forming each layer is a separate plate-like member, and each plate-like member is laminated by bonding through an adhesive layer. Since the structure is formed, there has been a problem that the joining work of the respective layers becomes complicated as the flat cable is multi-layered, thereby increasing the manufacturing cost.

  The present invention has been devised by paying attention to such a technical problem, and provides a flat cable that can reduce the manufacturing cost without complicated joining work.

  The invention described in claim 1 includes a metal layer made of a conductive metal material, an adhesive layer formed on the upper and lower surfaces of the metal layer by an insulating adhesive, and the upper surface of the metal layer via the adhesive layer. A film-like insulating layer laminated on the lower surface, and a conductor group having a plurality of conductors spaced apart from each other with a predetermined interval inside the metal layer. A long flexible substrate arranged in a predetermined range in the width direction is provided, the unfolded flexible substrate is folded back in the width direction, and the width of the folded bent line position is The opposite portions are joined while the metal layers are electrically connected to each other, and the conductor group is held between the metal layer and the insulating layer.

  According to this invention, the flat cable is formed by folding the flexible substrate in the unfolded state, joining the opposite side of the broken line, and conducting the metal layers that hold the conductor group in a sandwiched state. Therefore, the complicated joining work of each layer accompanying the lamination of the flat cable is not required. For this reason, it becomes possible to form the said flat cable multilayered, without impairing workability | operativity. Thereby, the flat cable can be easily multi-layered, and the manufacturing cost can be reduced.

  According to a second aspect of the present invention, in the unfolded state, the flexible substrate formed by forming the conductor group at a substantially central position in the width direction of the metal layer is formed on both ends in the width direction of the conductor group. The metal layer is folded in a trifold shape with the positions near the outer ends of both ends of the conductor group as a broken line so that the conductor group is sandwiched from above and below via the insulating layer, and the width with respect to the position of the broken line A portion opposite to the direction is joined while the metal layers are electrically connected to each other.

  According to this invention, the metal cable and the conductor group are formed as a single layer, and the three layers of the flat cable are formed only by forming the substantially three layers of the flexible substrate including the metal layer and the insulating layer. Therefore, the same effects as those of the first aspect of the invention can be achieved.

  According to a third aspect of the present invention, there is provided a conductor group having a plurality of conductors spaced apart at a predetermined interval in the width direction, and a film bonded to the upper and lower surfaces of the conductor group via an insulating adhesive layer A shield layer composed of a conductor layer composed of a conductive insulating layer, a metal layer composed of a conductive metal material, and a film-shaped insulating layer adhered to the outer surface of the metal layer via an insulating adhesive layer, A flexible substrate in an unfolded state formed by adhering the shield layer from the metal layer side through an insulating adhesive layer on the outer surface of the conductor layer, the flexible substrate being disposed on the inner side The flexible substrate is bent in a double fold shape with the substantially central position in the width direction of the flexible substrate as a broken line, and the metal layers are electrically connected to each other on the opposite side of the width direction with respect to the position of the bent line. Joined It is characterized by a door.

  According to the present invention, the flat cable is provided with the conductor layer on one side and the shield layer on the other side, thereby forming the flexible substrate in an unfolded state, and folding the flexible substrate in half. Thus, the flat cable having the conductor layer in two layers is formed by joining the opposite sides of the broken line and conducting the metal layers of the shield layer holding the conductor layer in a sandwiched state. It can be formed easily.

  That is, by bending the substantially five layers of the flexible substrate including the three conductor layers and the two shield layers, it is possible to eliminate the need for complicated joining operations of the respective layers accompanying the lamination of the flat cables. Since it is possible to easily form the ten-layer flat cable having two conductor layers, the manufacturing cost can be reduced.

  The invention according to claim 4 is a method of manufacturing a flat cable, and includes a plurality of metal foils made of a flat and long conductive material at a substantially central position in the width direction at predetermined intervals in the width direction. A single metal layer is formed by forming a notch portion along the longitudinal direction and forming a conductor group by disposing a plurality of conductors in each notch portion in a non-contact state with respect to the inner peripheral edge of each notch portion. A first step of forming a layer, a second step of forming a flexible substrate developed by pressing an insulating film coated with an insulating adhesive on the upper and lower surfaces of the metal layer, and the flexible substrate. A third step of folding the conductor group in a tri-fold shape so as to sandwich the conductor group from above and below at positions near both ends of the conductor group, and a portion on the opposite side in the width direction with respect to the position of the fold line, The metal layers A fourth step of joining rendered conductive while, and characterized by being configured by.

  According to the present invention, the metal layer and the conductor group are formed of the same material, and each notch is formed in the metal layer, and at the same time, the conductor group is disposed by punching by shearing. As a result, the workability of assembling the flat cable is improved, so that the manufacturing cost can be further reduced. Further, even in the invention of the manufacturing method, the same effect as that of the invention of the second aspect can be obtained.

  The invention according to claim 5 is a method of manufacturing a flat cable, and insulates the upper surface and the lower surface of a conductor group having a plurality of long conductors spaced apart by a predetermined interval in the width direction. A first step of forming a conductor layer by press-bonding an insulating film coated with a conductive adhesive, and crimping an insulating film coated with an insulating adhesive on the outer surface of a metal foil made of a conductive metal material The second step of forming a shield layer by this, and after applying an insulating adhesive to the surface of the shield layer on the metal foil side, the shield layer was developed by pressure bonding to the outer surface of the conductor layer A third step of forming a flexible substrate, a fourth step of folding the flexible substrate in a double fold shape so that the conductor layers are inside at approximately the center position in the width direction of the flexible substrate, The opposite site of the width direction with respect to the fold line position, is characterized by being configured a fifth step of bonding while conducting the metal foil each other by.

  According to this invention, even if it exists in this invention of a manufacturing method, the effect similar to the invention of the said Claim 3 is acquired.

  Hereinafter, embodiments of a flat cable according to the present invention will be described in detail with reference to the drawings, and applied to the same use as in the prior art.

  1 to 4 show a first embodiment of the present invention, and this flat cable 1 is composed of a flexible belt-like substrate 2 having flexibility, as shown in FIG. In the unfolded state, the metal layer 3 made of a conductive metal material, the adhesive layer 4 formed of an insulating adhesive on the upper and lower surfaces of the metal layer 3, and the metal layer 3 through the adhesive layer 4 A film-like insulating layer 5 laminated on an upper surface and a lower surface, and a conductor group 7 having a plurality of conductors 6 spaced apart from each other at a predetermined interval inside the metal layer 3 are provided.

  In addition, as shown in FIG. 2, the flexible substrate 2 includes a central portion 2a in which the conductor group 7 is disposed, and both side portions 2b and 2c located on both right and left ends in the width direction of the central portion 2a. A plurality of circular holes 8 are formed at predetermined intervals on both ends in the longitudinal direction of the both side portions 2b and 2c.

  As shown in FIGS. 2 and 3, the metal layer 3 is a copper foil formed in a strip shape, and a plurality of notches 9 are sheared in the central portion 2a. The notches 9 are provided in parallel at a predetermined interval, extend in a straight line along the longitudinal direction, and both end portions 9a and 9b are formed in an arc shape. The metal layer 3 may be a thin film conductive metal material, and may be, for example, an aluminum foil.

  As shown in FIG. 3, each conductor 6 is a long wire rod having a substantially rectangular cross section and extending in the axial direction, as shown in FIG. 6a and 6b are respectively formed in an annular shape having a through hole 10 for joining a resistor, a diode, or the like.

  The conductors 6 are disposed in the notch portions 9 so as to be separated from the inner peripheral edge of the notch portions 9 in a non-contact state, and are formed in the same plane as the metal layer 3. Yes. That is, each of the conductors 6 is a part of the copper foil that forms the metal layer 3, and when the notches 9 are formed, the conductors 6 remain in the notches 9. The metal layer 3 in the vicinity of the outer periphery of each conductor 6 is sheared to be disposed in each notch portion 9 in a non-contact state.

  As shown in FIG. 3, the adhesive layer 4 is an adhesive that shares insulating properties and flame retardancy, and is applied to the outer surface of the film-like insulating layer 5, and the insulating layer 5 and the conductor group 7. Is joined to the metal layer 3 on which is disposed. Further, by bonding the metal layer 3 and the insulating layer 5, the adhesive applied to the insulating layer 5 flows into the gaps between the conductors 6 and the notches 9. As shown in FIG. 3, the adhesive layer 4 is also formed in this gap, and the adhesive layer 4 separates each conductor 6 and each notch 9 from each other.

  As shown in FIG. 3, the insulating layer 5 is a resin film made of polyimide, which is a polymer material having excellent heat resistance, and is provided on the outermost layer of the flexible substrate 2. Protect. The resin film forming the insulating layer 5 can be applied to other plastic polymer materials such as PET (polyethylene terephthalate), which is advantageous in terms of cost, and PPS (polyphenylene sulfide) having flame retardancy and heat resistance. It is.

  As shown in FIG. 1, the flat cable 1 includes the flexible substrate 2 such that a central portion 2 a where the conductor group 7 is disposed is sandwiched between both side portions 2 b and 2 b made of only the metal layer 3. Is folded in a substantially Z-shape and a single conductor group 7 is arranged at the center of the entire flat cable 1 layer.

  That is, a position in the vicinity of the outside of both ends of the conductor group 7 in the width direction of the flexible substrate 2, specifically, a position where the metal layer 3 on the outside of both ends of the conductor group 7 in the width direction slightly remains. The flexible substrate 2 is folded back in the opposite directions in the width direction. Thereby, the flat cable 1 is formed with a mountain fold portion 11a and a valley fold portion 11b at each end in the width direction. Since the flexible substrate 2 is formed to be sufficiently thin as compared with the conventional flat cable, the bending radius of the bent portion 9 can be set to be sufficiently small.

  Further, the flat cable 1 includes the metal layer of the central part 2a and the two side parts 2b and 2c which are stacked on the opposite sides in the width direction of the mountain fold part 11a and the valley fold part 11b of the folded flexible substrate 2. 3 and 3 are joined to each other by solder via the insulating layer 5 and the adhesive layer 4. Specifically, the insulating layer 5 and the adhesive layer 4 are melted by the heat of soldering, and a joint portion 12 in which the metal layers 3 and 3 are directly joined is provided.

  The metal layers 3 and 3 can be bonded to each other by removing the insulating layer 5 and the adhesive layer 4 corresponding to the bonding position and bonding the metal layers 3 and 3 with a conductive adhesive. In addition, a conductive metal such as a pin shape to which a conductive adhesive is applied may be made conductive by being embedded between the metal layers 3 and 3.

  Thus, the flat cable 1 is formed by folding the flexible substrate 2 formed in substantially three layers of the metal layer 3 including the conductor group 7 and the insulating layers 5 and 5 into three folds. Formed in layers.

  Next, the manufacturing method of the flat cable 1 will be described with reference to FIG. 1 and FIG. 4. First, in the first step, a plurality of strips are provided at predetermined positions substantially at the center in the width direction of the strip-shaped copper foil at predetermined intervals. The notch portions 9 are sheared and the conductor groups 7 are left in the notch portions 9 to dispose the conductor groups 7 in a non-contact state with respect to the inner peripheral edge of the notch portions 9. The metal layer 3 is formed.

  Subsequently, in the second step, the adhesive is applied to one side of the insulating film to form the adhesive layer 4, and then the insulating film is crimped to both sides of the metal layer 3 including the conductor group 7. Then, the flexible substrate 2 is formed by forming the insulating layers 5 and 5.

  Then, in the third step, the metal layers 3 are formed by using the outer vicinity of both ends in the width direction of the conductor group 7 near the boundary between the central portion 2a and the both side portions 2b and 2c of the flexible substrate 2 as a broken line. The two side portions 2b and 2c are alternately folded with respect to the central portion 2a of the flexible substrate 2 so that the conductor group 7 is sandwiched from above and below through the insulating layers 5 and 5 in a substantially trifold shape. The circular holes are folded so as to match the both end portions 9a, 9b of each notch portion 9.

  Further, in the fourth step, each of the insulating layers that serve as inner facing surfaces on the opposite sides in the width direction of the flexible substrate 2 with respect to the mountain fold portion 11a and the valley fold portion 11b formed in the third step. The metal layer 3 and 3 of the central part 2a and the two side parts 2b and 2c laminated via 5 and 5 are soldered on the insulating layer 5 to solder the insulating layer 5 and the adhesive layer 4 with the heat of the solder. Joining while melting, the assembly of the flat cable 1 is completed.

  Therefore, according to this embodiment, the substantially three-layer flexible substrate 2 in which the insulating layers 5 and 5 are joined to the metal layer 3 including the conductor group 7 is folded in a substantially Z-shape, The joining portion 12 is easily formed at each end portion of the central portion 2a and both side portions 2b and 2c stacked on the opposite side in the width direction with respect to the formed mountain fold portion 11a and valley fold portion 11b. Nine layers of the flat cable 1 can be formed only by the joining operation.

  Thereby, the work man-hours for joining the layers can be minimized, and the multilayered flat cable 1 can be obtained without the complicated joining work of joining the layers individually as in the prior art. Since it can be formed, the manufacturing cost can be reduced.

  Further, the metal layer 3 and the conductor group 7 are formed of the same material, and the notch portions 9 are formed in the metal layer 3 and at the same time, the conductor group 7 is disposed by punching by shearing. As a result, the assembling workability of the flat cable 1 is improved, so that the manufacturing cost can be further reduced.

  Furthermore, since the flexible substrate 2 can be formed thinner than before by arranging the conductor group 7 in the metal layer 3, the number of steps for joining the flexible substrate 2 is shortened, and the manufacturing cost is further reduced. Can be achieved.

  5 and 6 show a second embodiment of the present invention, the basic configuration is the same as that of the first embodiment, and the flat cable 13 is different from that of the first embodiment as shown in FIG. The flexible substrate 14 is formed by being folded in almost half.

  That is, the flexible substrate 14 includes both side portions 14a and 14b that are substantially equally divided in the width direction in the unfolded state, and a plurality of the circular holes 8 are formed at both ends in the longitudinal direction of the both side portions 14a and 14b. Has been.

  The flexible substrate 14 includes a conductor layer 15 formed by pressure bonding so that a pair of the insulating layers 5 and 5 each having the adhesive layer 4 on the outer surface is sandwiched from above and below the conductor group 7, and the conductor layer. And a shield layer 17 that is laminated on the outer surface of the metal layer 16 via the adhesive layer 4 and the insulating layer 5 is formed on the outer surface of the metal layer 16 made of unprocessed copper foil via the adhesive layer 4. Yes.

  Further, the flat cable 13 has a lateral U in the width direction of the flexible board 14 such that the conductor layer 15 is on the inner side with the flexible board 14 having a substantially central position in the width direction of the flexible board 14 as a broken line. It is formed by being folded into almost a half-shape in a letter shape.

  Specifically, the flat cable 13 includes the conductor layers 15 and 15 sandwiched between the metal layers 16 and 16 from above and below, and the conductor layers 15 and 15 via the insulating layers 5 and 5. By adjoining 15 adjacent to each other, two conductor layers 15 and 15 are arranged at substantially the center of the entire layer, and the shield layers 17 and 17 are arranged on the outer layer side.

  Further, the flat cable 13 has a width with respect to the bent portion 18 formed on one end side in the width direction of the flat cable 13 in a state in which the flexible substrate 14 is folded, as in the first embodiment. The joint portions 12 are formed at both end portions of both side portions 14a and 14b which are the other end sides in the direction, and the outer end portions of the metal layers 16 and 16 stacked via the two insulating layers 5 are connected to each other. Are joined by solder or the like.

  In this manner, the flat cable 13 is formed by folding the substantially five layers of the flexible substrate 14 including the three layers of the conductor layers 15 and the two layers of the shield layers 17, thereby forming two layers of conductor layers 15, 15. Are formed into ten layers.

  Next, the manufacturing method of the flat cable 1 will be described. First, in the first step, after forming the adhesive layer 4 by applying the adhesive to the outer surface of the insulating film, Insulating layers 5 and 5 are formed on the upper and lower sides of the conductor group 7 by pressing the entire conductor group 7 in which long copper foils are spaced apart from each other by a predetermined distance so as to be sandwiched from above and below. Thus, the conductor layer 15 is formed.

  Subsequently, in the second step, the adhesive is applied to the outer surface of a different insulating film to form the adhesive layer 4, and then the insulating film is pressure-bonded to the outer surface of the metal layer made of copper foil. A shield layer 17 is formed by forming the insulating layer 5.

  In the third step, the adhesive layer 4 is formed by applying the adhesive to the surface of the shield layer 17 on the metal layer 16 side, and then the shield layer 17 is pressure-bonded to the outer surface of the conductor layer 15. Then, the developed flexible substrate 14 is formed.

  Then, in the fourth step, the flexible substrate 14 is folded back in the width direction toward the one side portion 2a so that the conductor layer 15 is on the inner side with the substantially central position in the width direction of the flexible substrate 14 as a broken line. Then, each of the circular holes 8 is folded in two so as to be aligned.

  Further, in the fifth step, both side portions 14a and 14b which are the other end side in the width direction with respect to the bent portion 18 formed on one end side in the width direction of the flat cable 13 formed in the fourth step. The insulating layers 5 and the adhesive layer 4 are formed by placing solder on the insulating layer 5 between the outer ends of the metal layers 16 and 16 laminated on the both ends of the insulating layer 5 through the two layers. Joining while melting by the heat of the solder, the assembly of the flat cable 13 is completed.

  Therefore, according to this embodiment, the substantially five layers of the flexible substrate 14 composed of the three conductor layers 15 and the two layers of the shield layers 17 are folded in half in a substantially U shape in the width direction. Easy joining in which the joint 12 is formed at each end of both side portions 14a and 14b stacked on the other end side with respect to the bent portion 18 formed on one end of the bent flexible substrate 14. The ten-layer flat cable 13 can be formed only by work. Thereby, it becomes possible to form the multilayered flat cable 13 having the conductor layer 15 in two layers without complicated joining work, and the manufacturing cost can be reduced.

  The present invention is not limited to the configuration of each of the above embodiments. For example, the number of layers of each of the flexible boards 2 and 14 and the number of layers on which the conductor group 7 is disposed are set to the numbers of the flat cables 1 and 13. It can be freely changed according to the intended use.

  The flexible board 2 is not limited to three folds, and the flexible board 14 is not limited to two folds. Each of the flexible boards 2 and 14 includes both the conductor layer 7 and the metal layers 3 and 16. By being bent so as to be on the inside, the same effects as those of the above-described embodiments can be achieved regardless of the number of bendings.

It is sectional drawing (sectional drawing which shows the assembly state of FIG. 3) of the flat cable which shows 1st Embodiment which concerns on this invention, and demonstrates the principal part of this invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a development view of a flexible substrate according to a first embodiment of the present invention. It is the sectional view on the AA line of FIG. It is the schematic which shows 1st Embodiment which concerns on this invention, and demonstrates the bending state of a flexible substrate. It is sectional drawing of the flat cable which shows 2nd Embodiment which concerns on this invention, and demonstrates the principal part of this invention. It is the schematic which shows 2nd Embodiment which concerns on this invention, and demonstrates the bending state of a flexible substrate.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Flat cable 2 ... Flexible board 3 ... Metal layer 4 ... Adhesive layer 5 ... Insulating layer 6 ... Conductor 7 ... Conductor group 9 ... Notch part 13 ... Flat cable 14 ... Flexible board 15 ... Conductive layer 16 ... Metal layer 17 ... Shield layer

Claims (5)

A metal layer made of a conductive metal material;
An adhesive layer formed of an insulating adhesive on the upper and lower surfaces of the metal layer;
A film-like insulating layer laminated on the upper and lower surfaces of the metal layer via the adhesive layer;
A conductor group having a plurality of conductors arranged at predetermined intervals inside the metal layer;
In a deployed state, the conductor group includes a long flexible substrate arranged in a predetermined range in the width direction,
The folded flexible substrate is folded in the width direction, and the portion opposite to the width direction with respect to the bent line position is joined while conducting the metal layers, A flat cable, wherein the conductor group is held in a sandwiched state by the metal layer and the insulating layer. In the unfolded state, the flexible substrate formed by forming the conductor group at a substantially central position in the width direction of the metal layer, the metal layer formed on both ends in the width direction of the conductor group via the insulating layer The conductor group is folded in a tri-fold shape with the positions near the outer sides of both ends of the conductor group as a broken line so as to sandwich the conductor group from above and below, and the portion on the opposite side in the width direction with respect to the position of the broken line The flat cable according to claim 1, wherein the metal layers are joined to each other while being conductive. A conductor layer comprising a conductor group having a plurality of conductors spaced apart at a predetermined interval in the width direction, and a film-like insulating layer bonded to the upper and lower surfaces of the conductor group via an insulating adhesive layer When,
A shield layer comprising a metal layer made of a conductive metal material and a film-like insulating layer bonded to the outer surface of the metal layer via an insulating adhesive layer;
Comprising a flexible substrate in a developed state formed by adhering the shield layer from the metal layer side through an insulating adhesive layer on the outer surface of the conductor layer,
The flexible substrate is folded in two so that the conductor layer is on the inner side and the central position in the width direction of the flexible substrate is a fold line, and the position of the fold line is opposite to the width direction. The flat cable characterized by joining the site | parts, electrically conducting the said metal layers. A flat cable manufacturing method, in which a plurality of notches are formed along the longitudinal direction at predetermined intervals in the width direction at substantially the center position in the width direction of a flat and long conductive metal foil. And a first step of forming a single metal layer in each notch by forming a conductor group by disposing a plurality of conductors in a non-contact state with respect to the inner peripheral edge of each notch,
A second step of forming a flexible substrate developed by crimping an insulating film coated with an insulating adhesive on the upper and lower surfaces of the metal layer;
A third step of folding the flexible substrate in a three-fold shape so as to sandwich the conductor group from above and below at positions near the outside of both ends in the width direction of the conductor group;
A fourth step of joining the portion on the opposite side in the width direction with respect to the position of the broken line while conducting the metal layers;
A method for manufacturing a flat cable, characterized by comprising: A method of manufacturing a flat cable, comprising: an insulating film in which an insulating adhesive is applied to the top and bottom of a conductor group having a plurality of long conductors spaced apart from each other at a predetermined interval in the width direction; A first step of forming a conductor layer by crimping;
A second step of forming a shield layer by crimping an insulating film coated with an insulating adhesive on the outer surface of a metal foil made of a conductive metal material;
A third step of forming a flexible substrate developed by applying an insulating adhesive to the surface of the shield layer on the metal foil side and then crimping the shield layer to the outer surface of the conductor layer;
A fourth step in which the flexible substrate is folded in half so that the conductor layer is located inside at a substantially central position in the width direction of the flexible substrate;
A fifth step of joining the opposite side of the width direction with respect to the position of the broken line while conducting the metal foils;
A method for manufacturing a flat cable, characterized by comprising:

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