JP2019003775A - Flexible flat cable and manufacturing method therefor - Google Patents

Abstract

To provide an FFC which is applicable to a 2-piece connector and to which the connector is strongly fixed at low cost, and a manufacturing method therefor.SOLUTION: In a flexible flat cable with a connector 1, insulation films 21 and 22 are laminated on both surfaces of a parallel surface of a conductor 11 aligned in parallel in parts other than a connection end part, a heat resistant insulation film 31 higher in heat resistance than the insulation films 21 and 22 is laminated on one surface of the parallel surface of the conductor 11 at the connection end part, and a cylindrical terminal 44 is fixed on another surface of the parallel surface. A plurality of cylindrical terminals 44 are inserted into a terminal housing part of a connector housing 50. For manufacturing, an exposure process of the conductor, a lamination process of a heat resistance insulation film, a terminal fixation process, and a terminal insertion process of the terminal to the connector housing are included.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a flexible flat cable including a connector and a method for manufacturing the same.

  A flexible flat cable (hereinafter also referred to as “FFC”) is used for the purpose of space saving and simple connection in many fields such as internal wiring of electronic and information equipment. When connecting the FFC to a printed circuit board, an insertion / removal type connector (one piece) that normally uses the end of a flat conductor as a terminal is used. On the other hand, as described in Patent Document 1, a harness using a round wire usually employs a two-piece connector (a plug and a receptacle are fitted).

JP 2011-113724 A

  When a wiring material is connected to a component such as a motor, a connector (two pieces) may be specified. A connector (plug or receptacle) is attached to the component side, and a connector (receptacle or plug) suitable for the connector needs to be attached to the wiring member.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a flexible flat cable that can be applied to a two-piece connector and has the connector fixed firmly and inexpensively and a method for manufacturing the same. .

  A flexible flat cable according to an aspect of the present invention is a flexible flat cable including a connector, and an insulating film is bonded to both sides of a parallel surface of a plurality of conductors arranged in parallel except for a connection end, and the connection end A heat-resistant insulating film having a higher heat resistance than the insulating film is bonded to one surface of the parallel surface, and a terminal is fixed to the other surface of the parallel surface. The terminal is inserted into the connector housing.

  Moreover, the method for producing a flexible flat cable according to one aspect of the present invention is a method for producing a flexible flat cable including a connector, in which a plurality of conductors are arranged in parallel, and an insulating film is bonded to both sides of the parallel surface. An exposure step of exposing the conductor of the portion to be the connection end, a heat-resistant insulating film having higher heat resistance than the insulating film on one side of the parallel surface of the exposed conductor of the portion to be the connection end A bonding step of bonding, a terminal fixing step of fixing the terminal to the other side of the parallel surface of the conductor, and a terminal insertion step of inserting the terminal into the connector housing.

  According to the present invention, a heat-resistant insulating film is provided only at a necessary portion, and terminals can be attached to each conductor at the same time using connected terminals. Therefore, a flexible flat cable provided with a connector can be provided. There is an advantage when a two-piece connector is used, and by using a flexible flat cable instead of a round wire harness, the advantage of FFC that it is lightweight, space-saving and inexpensive can be enjoyed.

It is a perspective view of the flexible flat cable which concerns on one Embodiment of this invention. It is the perspective view and sectional drawing which show the exposure process and sticking process in the middle of manufacture of the flexible flat cable which concerns on one Embodiment of this invention. It is the top view and perspective view which show the manufacturing process of the terminal of the flexible flat cable which concerns on one Embodiment of this invention. It is a figure which shows the terminal adhering process in the middle of manufacture of the flexible flat cable which concerns on one Embodiment of this invention. It is the perspective view and sectional drawing which show the terminal isolation | separation process in the middle of manufacture of the flexible flat cable which concerns on one Embodiment of this invention. It is a perspective view of the connector housing of the flexible flat cable which concerns on one Embodiment of this invention. It is a perspective view which shows the adhering process to the connector housing in the middle of manufacture of the flexible flat cable which concerns on one Embodiment of this invention. It is the perspective view and sectional drawing which show the terminal adhering process in the middle of manufacture of the flexible flat cable which concerns on other embodiment of this invention.

(Description of the embodiment of the present invention)
First, embodiments of the present invention will be listed and described.
The flexible flat cable according to one aspect of the present invention is (1) a flexible flat cable provided with a connector, and an insulating film is bonded to both sides of a parallel surface of a plurality of conductors arranged in parallel except for a connection end. A heat-resistant insulating film having a higher heat resistance than the insulating film is bonded to one surface of the parallel surface, and a terminal is fixed to the other surface of the parallel surface. The plurality of terminals are inserted into the connector housing.

  The flexible flat cable according to this embodiment has a heat-resistant insulating film instead of the insulating film only on one surface of the conductor at the connection end, and a terminal is fixed to the other surface of the conductor at the connection end. Therefore, it is not necessary to use an expensive heat-resistant insulating film over the entire length, and a flexible flat cable can be provided at a low cost. Moreover, since the terminal is inserted in the connector housing, it can be used as a two-piece connector.

  (2) As one aspect of the present invention, in the flexible flat cable of (1), a sealing member is inserted into an opening into which the flexible flat cable of the connector housing is inserted, and the connector housing and the flexible flat cable are inserted. May be fixed.

  The connector housing and the flexible flat cable can be more firmly fixed by inserting a sealing member into the opening of the connector housing.

  The manufacturing method of the flexible flat cable which concerns on 1 aspect of this invention is a manufacturing method of the flexible flat cable provided with the connector, Comprising: A plurality of conductors are paralleled and an insulating film is bonded together on both surfaces of a parallel surface. An exposure step of exposing the conductor in a portion to be a connection end, a heat-resistant insulating film having higher heat resistance than the insulating film on one side of the parallel surface of the conductor in which the portion to be a connection end is exposed An affixing step of attaching the terminal, a terminal adhering step of adhering the terminal to the other side of the parallel surface of the conductor, and a terminal inserting step of inserting the terminal into the connector housing.

  In the method of manufacturing a flexible flat cable according to this embodiment, a heat-resistant insulating film is provided instead of the insulating film only on one surface of the conductor at the connection end, and a terminal is provided on the other surface of the conductor at the connection end. Therefore, it is not necessary to use an expensive heat-resistant insulating film over the entire length, and a flexible flat cable can be provided at low cost. Moreover, since the terminal is inserted in the connector housing, it can be used as a two-piece connector.

As one aspect of the present invention, in the method for producing a flexible flat cable of (3), (4) the exposing step may be a step of attaching the insulating film to a portion excluding the connection end portion of the parallel surface of the conductor. In addition, (5) the exposing step may be a step of removing the insulating film in a portion to be the connection end portion after the insulating film is bonded to both sides of the parallel surface of the conductor. .
In this embodiment, various manufacturing methods can be selected as the exposure step.

  As one aspect of the present invention, in the method for producing a flexible flat cable according to any one of (3) to (5), (6) the terminals are connected by a connecting portion, and the terminal fixing step It may be a step of fixing the terminal together with the connecting portion to the other surface of the parallel surface of the conductor.

  In this embodiment, since the terminals can be fixed to a plurality of conductors at the same time in a state where the terminals are connected by the connecting portion, workability is improved by shortening the working time compared to the case where the terminals are fixed to the conductors individually.

  As one aspect of the present invention, in the method for producing a flexible flat cable according to (6), (7) the attaching step is commonly performed on one surface of the parallel surfaces of all the conductors. It is a step of bonding films, and has a terminal separation step of cutting off the heat-resistant insulating film between the terminals and the connecting portion after the terminal fixing step.

  In this embodiment, since one heat-resistant insulating film is commonly bonded to one surface of the parallel surfaces of the conductors, it is not necessary to bond an insulating film to each conductor, and workability is improved. Moreover, each separated terminal can be obtained by cutting off the heat-resistant insulating film and the connecting portion between the terminals.

As one aspect of the present invention, in the method for producing a flexible flat cable of (7),
(8) The connector housing has a partition that separates the terminals between the terminal accommodating portions, and the terminal insertion step includes the partition wall at the location where the heat-resistant insulating film and the connecting portion are cut off in the terminal separation step. It may be a step of inserting.

  In the present embodiment, the separated terminals are inserted into the terminal storage portion, and the terminals can be maintained physically and electrically separated by the partition walls of the connector housing.

(Details of the embodiment of the present invention)
Specific examples of the flexible flat cable and the manufacturing method thereof according to the embodiment of the present invention will be described below with reference to the drawings. In addition, this invention is not limited to these illustrations, is shown by the claim, and includes all the changes within the meaning and range equivalent to the claim. Moreover, in the following description, the structure which attached | subjected the same code | symbol also in different drawing is the same, and the description may be abbreviate | omitted.

  FIG. 1 is a perspective view and a cross-sectional view of a flexible flat cable according to an embodiment of the present invention. In the present embodiment, the conductor of the flexible flat cable will be described by taking a flat conductor as an example, but the shape of the conductor is not limited to a flat conductor. In the case of a flexible flat cable using a round wire conductor, the round wire conductor may be crushed at the end portion to have a flat rectangular shape.

  The FFC 1 with a connector includes an FFC 10 provided with terminals and a connector housing 50. The FFC 10 has a first insulating film 21 and a second insulating film 22 bonded to both sides of a parallel surface of a plurality of parallel rectangular conductors 11 other than the connection end, and the connection end is a parallel surface of the flat conductor 11. A heat resistant insulating film 31 having higher heat resistance than the first insulating film 21 and the second insulating film 22 is bonded to one surface. In addition, a cylindrical terminal 44 is fixed to the other side of the parallel surface of the connecting end of the flat conductor 11 as an example, and the flat conductor 11 is sandwiched between the heat-resistant insulating film 31 and the cylindrical terminal 44. Thus, it is inserted into the terminal housing portion of the connector housing 50.

  Next, the manufacturing method of the flexible flat cable which concerns on embodiment of this invention is demonstrated. The manufacturing method of the flexible flat cable which concerns on embodiment of this invention is a process which exposes a conductor from the edge part of a flexible flat cable, The heat resistant insulation film with high heat resistance is also applied to one side of the parallel surface of the exposed conductor. The process includes an affixing step, a terminal adhering step for adhering the terminal to the other side of the parallel surface of the conductor, and a terminal inserting step for inserting the terminal into the connector housing, which will be sequentially described below.

  2A and 2B are a perspective view and a cross-sectional view showing an exposure process and a sticking process in the course of manufacturing the flexible flat cable according to the embodiment of the present invention. FIG. 2A shows a flexible flat cable shown in FIG. B is an exposure process, and FIG. 2C is a perspective view and a cross-sectional view showing a sticking process, respectively.

  In the FFC 10 used in the present embodiment, for example, a plurality of flat conductors 11 having a flat cross section are arranged in parallel, and both parallel surfaces (XY planes) of the flat conductors 11 (upper and lower surfaces in the Z-axis direction) are first insulated. A flat cable that is insulated and sandwiched between the film 21 and the second insulating film 22 is used. The FFC 10 shown in FIG. 2A is a long cable, and the FFC 10 is cut into a predetermined length and used. As shown in FIG. 2 (B), the end portion of the FFC 10 is a portion that becomes the connection end portion A, the first insulating film 21 and the second insulating film 22 do not exist, and only the flat conductor 11 is exposed. .

  In order to obtain the FFC 10 having the connecting end A, the first insulating film 21 and the second insulating film are cut so that the FFC 10 is cut to a predetermined length and the flat conductors 11 are exposed in the regions at both ends of the cut FFC 10. 22 may be removed. Alternatively, the first insulating film 21 and the second insulating film 22 are not present from the beginning at the location to be the connection end A, and the first insulating film 21 and the second insulating film 22 are connected to both sides of the flat conductor 11. The connection end A of the flat conductor 11 may be exposed by bonding at a place other than the part A. In the present invention, the process of obtaining the exposed portion of the flat conductor is referred to as the exposure process.

  The flat conductor 11 for signal or power supply is made of, for example, a conductive metal foil such as copper foil or tinned annealed copper foil, and depends on the current value to be transmitted. Those having a thickness t of 12 μm or more and a width W of 0.3 mm or more are arranged. When the current capacity is large, for example, a conductor having a thickness of 0.16 mm and a width of 2.0 mm is used. The flat conductor 11 can be thicker and wider. The arrangement state of the flat conductors 11 is held between the first insulating film 21 and the second insulating film 22. In the example shown in the figure, four rectangular conductors 11 are shown, but the number of the rectangular conductors 11 may be two or more, or more.

  The first insulating film 21 and the second insulating film 22 have an adhesive layer (not shown) on their inner surfaces (bonding surfaces). For the first insulating film 21 and the second insulating film 22 themselves, a resin material having excellent flexibility is used. For example, a versatile resin film such as a polyester resin or a polyphenylene sulfide resin can be used. The resin film has a thickness of 9 to 50 μm. Examples of the polyester resin include resin materials such as polyethylene terephthalate resin, polyethylene naphthalate resin, and polybutylene naphthalate resin. Of these resin films, polyethylene terephthalate resin is preferably used from the viewpoints of electrical characteristics, mechanical characteristics, cost, and the like.

  In addition, what consists of resin materials is used for said adhesive layer, For example, the adhesive agent etc. which added the flame retardant to the polyester-type resin and the polyolefin-type resin are mentioned. This adhesive layer is formed with a thickness of 10 μm to 100 μm. The first insulating film 21 and the second insulating film 22 are bonded and integrated by facing the adhesive layer across the flat conductor 11 and joining them while applying heat with a heating roller.

  As shown in FIG. 2C, a heat-resistant insulating film 31 is attached to one surface of the parallel surface of the flat conductor 11 at the connection end A where the flat conductor 11 is exposed. The heat resistant insulating film 31 is made of a material having higher heat resistance than the first insulating film 21 and the second insulating film 22 so as not to be deformed by the influence of heat when fixing a terminal described later to the flat conductor 11. In addition, the heat-resistant insulating film 31 has a certain degree of stiffness compared to the first insulating film 21 and the second insulating film 22 so that the connection end portion A where the connector is mounted has strength. Have moderate hardness and thickness. As a material of the heat resistant insulating film 31, a polyester resin or a polyimide resin can be used.

  Furthermore, in this embodiment, the heat-resistant insulating film 31 covers the end portion of the second insulating film 22 in order to reliably position the flat conductor 11 with the heat-resistant insulating film 31 and increase the strength of the terminal portion. Is pasted. As an adhesive (not shown) for attaching the heat-resistant insulating film 31 to the flat conductor 11 or the second insulating film 22, in order to fix a terminal to be described later to the flat conductor 11, it is thermosetting in the case of reflow. An adhesive is used. The heat-resistant insulating film 31 provided with an adhesive on one side is positioned facing the connection end A where the flat conductor 11 of the FFC 10 is exposed and the end of the second insulating film 22, and heat is applied by a heating roller. The FFC 10 in which the heat-resistant insulating film 31 is bonded to one side of the parallel surface of the flat conductor 11 to be integrated is obtained by bonding. In the present invention, the step of sticking the heat-resistant insulating film to the flat conductor is called a sticking step.

  Next, the manufacturing process of the terminal used in this embodiment will be described. FIG. 3 is a diagram showing a manufacturing process of the terminal of the flexible flat cable according to the embodiment of the present invention. As shown in FIG. 3 (A), the terminal member 40 is made of a conductive plate-like member. First, from a long plate-like member, a terminal portion 43 provided at a predetermined pitch with a connecting portion 41 and a terminal base portion. It is obtained by punching leaving 42. It is desirable that the width (length in the X direction) of the terminal base 42 be slightly smaller than the width (length in the X direction) of the flat conductor 11. As a result, when solder or an adhesive is inserted between the terminal base 42 and the flat conductor 11 to fix them together, the solder or adhesive may also wrap around the side of the terminal base 42 and firmly fix both. it can. Next, as shown in FIGS. 3B and 3C, a plurality of female cylindrical terminals 44 are formed by bending the terminal portion 43 of the terminal plate member. The plurality of cylindrical terminals 44 are integrally connected at a predetermined pitch by a connecting portion 41 through a terminal base 42. The arrangement pitch of the cylindrical terminals 44 and the terminal base 42 is equal to the arrangement pitch of the flat conductors 11 of the FFC 10.

  Next, the process of fixing the terminal member 40 to the FFC 10 will be described. 4A and 4B are a perspective view and a cross-sectional view showing a terminal fixing process in the process of manufacturing the flexible flat cable according to the embodiment of the present invention, and FIG. 4B is a cylindrical terminal 44 in FIG. It is sectional drawing in the XZ plane in the part. First, the connecting portion 41 of the long terminal member 40 is cut, and the terminal member 40 including the same number of cylindrical terminals 44 as the number of the flat conductors 11 of the FFC 10 is cut out. In the case of the present embodiment shown in FIG. 4, the number of the rectangular conductors 11 is four, so that the four cylindrical terminals 44 are cut out in a state of being integrally connected by the connecting portion 41.

  When the terminal is fixed to the flat conductor 11 by soldering, for example, a solder paste is applied in advance to the entire mounting surface of the flat conductor 11 of the terminal member 40, and the cylindrical terminal 44 and the terminal base 42 of the terminal member 40 are then applied. The terminal member 40 and the rectangular conductor 11 are soldered in a state where the terminal member 40 is positioned so as to be positioned above the rectangular conductor 11 in the Z direction. As a method of soldering, surface mounting may be performed by reflowing only the connection portion, or local heating may be performed using a laser. Alternatively, welding such as ultrasonic welding or spot welding may be used without using soldering. Since the heat-resistant insulating film 31 has high heat resistance, it does not deteriorate due to the temperature at the time of soldering or welding.

  Next, from the state in which both surfaces of the parallel surface (XY plane) of the flat conductor 11 of the connection end A are integrated by the heat-resistant insulating film 31 and the terminal member 40 connected by the connecting portion 41, Separate the terminals. 5A and 5B are a perspective view and a cross-sectional view showing a terminal separation process in the middle of manufacturing the flexible flat cable according to the embodiment of the present invention, and FIG. 5B is a cylindrical terminal 44 in FIG. It is sectional drawing in the XZ plane in the part. The connecting portion 41 between the heat-resistant insulating film 31 and the terminal member 40 located between the flat conductors 11 is punched and removed from the connecting end A of the FFC 10 shown in FIG. As a result, as shown in FIG. 5, the FFC 10 is obtained in which the heat-resistant insulating film 31 is attached to one surface of each individual flat conductor 11 and the cylindrical terminal 44 and the terminal base 42 are fixed to the other surface. It is done. The individual terminals are separated to form an independent circuit for each conductor.

  FIG. 6 is a perspective view of the connector housing of the flexible flat cable according to the embodiment of the present invention. The connector housing 50 is made of an insulating synthetic resin and is formed in a box shape in the present embodiment. A plurality of terminal storage portions 52 are formed inside the connector housing 50, and partition walls 51 that separate the terminal storage portions 52 are provided between the terminal storage portions 52. Further, a lock member 53 is provided on the outer surface of the connector housing 50 to prevent the connector housing 50 from coming off when connected to the other connector. The terminal accommodating portion 52 penetrates in the Y-axis direction, and a terminal formed at the connection end portion of the FFC 10 shown in FIG. 5 is inserted from the opposite side of the Y-axis direction shown in FIG. 6 to connect the FFC 1 with connector shown in FIG. obtain. In the present invention, the process of inserting the terminal into the connector housing is called a terminal insertion process.

  The length (the length in the Y-axis direction) of the terminal housing portion 52 of the connector housing 50 is formed substantially equal to the length of the connection end A of the FFC 10, and the thickness of the partition wall 51 (the length in the X-axis direction) is The heat-resistant insulating film 31 cut out in the terminal separation step and the width (length in the X-axis direction) of the connecting portion 41 of the terminal member 40 are formed to be approximately equal to or slightly larger. For this reason, the FFC 10 is fixed to the connector housing 50 with sufficient strength by inserting the terminals of the FFC 10 into the terminal housing portion 52 of the connector housing 50. It can be said that the step of inserting the terminal into the connector housing 50 is a step of inserting the partition wall 51 into the location of the heat-resistant insulating film 31 and the connecting portion 41 cut out in the terminal separation step.

  As shown in FIG. 7, an opening 55 for inserting the FFC 10 is opened on the end face 54 of the connector housing 50 on the FFC 10 side. A terminal formed at the connection end portion of the FFC 10 is inserted from the opening 55, and the sealing member 60 is further fitted. The sealing member 60 contacts the first insulating film 21 (or the second insulating film 22) with the FFC 10. The connector housing 50 is fixed to the FFC 10 by the sealing member 60 at the edge of the end surface 54 on the FFC 10 side of the connector housing 50. The connector housing 50 is preferable because it is firmly fixed to the FFC 10. The sealing member 60 may be fitted into the opening 55, but the sealing member 60 may be bonded to the connector housing 50 or the FFC 10. In addition, although the sealing member 60 shown in FIG. 7 has the part extended | stretched to the side surface of the width direction of FFC10, this extending | stretching part does not need to be.

  In this embodiment, since the tip of the connecting end A of the flat conductor 11 (tip in the Y-axis direction) and the tip of the cylindrical terminal 44 (tip in the Y-axis direction) are at the same position, the connector shown in FIG. Although the flat conductor 11 and the heat-resistant insulating film 31 are exposed at the tip of the FFC 1, the entire cylindrical terminal 44 may protrude from the tip of the connection end A of the flat conductor 11. In this case, by setting the inner surface shape of the terminal housing portion 52 of the connector housing 50 on the end surface side in the Y-axis direction to the same shape as the outer shape of the cylindrical terminal 44, only the cylindrical terminal 44 is seen from the tip of the FFC 1 with a connector. Will be exposed.

  As mentioned above, although the flexible flat cable which has a flat rectangular conductor was mainly demonstrated as embodiment of this invention, this invention is applicable also to the flexible flat cable using a round wire conductor. FIGS. 8A and 8B are a perspective view and a cross-sectional view showing a terminal fixing process in the course of manufacturing a flexible flat cable according to another embodiment of the present invention, and correspond to FIG. 4 showing a case where a rectangular conductor is used. FIG. 8B is a cross-sectional view parallel to the XZ plane at the location (BB) of the connecting portion 41 ′ shown in FIG.

  When a round wire conductor 11 ′ is used as the conductor, as shown in FIG. 8, a heat-resistant insulating film 31 is bonded to one side of the parallel surface of the round wire conductor 11 ′ at the connection end, and the other side is attached. The terminal member 40 ′ is fixed. In this case, a portion connected to the terminal base portion 42 ′ of the connecting portion 41 ′ of the terminal member 40 ′ is formed into a curved concave portion in accordance with the outer shape of the round wire conductor 11 ′, and the connecting portion 41 ′ is placed on the round wire conductor 11 ′. For example, each round bar conductor 11 ′ and the terminal member 40 ′ are soldered. After that, the connecting portion 41 ′ between the round bar conductors 11 ′ and a part of the heat-resistant insulating film 31 are cut away so that the individual round wire conductors 11 ′ and the terminals are separated and independent. In the embodiment shown in FIG. 8, the cylindrical terminal 44 ′ provided at the tip of the terminal base 42 ′ protrudes from the tip of the round wire conductor 11 ′ and the end in the Y direction of the heat resistant insulating film 31.

  In the above embodiment, the female (receptacle) type terminal is described as an example of the terminal fixed to the flat conductor 11 or the round wire conductor 11 ′. However, a male (plug) type terminal may be used. Furthermore, as a method of fixing the terminal to the connector housing 50, various methods such as adhesion and fitting can be used.

DESCRIPTION OF SYMBOLS 1 ... Flexible flat cable (FFC) with a connector, 10 ... Flexible flat cable (FFC), 11 ... Flat conductor, 11 '... Round wire conductor, 21 ... 1st insulating film, 22 ... 2nd insulating film, 31 ... Heat resistance Insulating film, 40, 40 '... terminal member, 41, 41' ... connecting portion, 42, 42 '... terminal base, 43 ... terminal portion, 44, 44' ... cylindrical terminal, 50 ... connector housing, 51 ... partition wall, 52... Terminal housing portion, 53... Lock member, 54... End face, 55.

Claims (8)

A flexible flat cable with a connector,
Except for the connection end, an insulating film is bonded to both sides of the parallel surface of a plurality of conductors arranged in parallel,
A heat-resistant insulating film having a higher heat resistance than the insulating film is bonded to one surface of the parallel surface, and a terminal is fixed to the other surface of the parallel surface. And
The plurality of terminals are flexible flat cables inserted into a connector housing.   The flexible flat cable according to claim 1, wherein a sealing member is inserted into an opening of the connector housing into which the flexible flat cable is inserted, and the connector housing and the flexible flat cable are fixed. A method of manufacturing a flexible flat cable having a connector,
An exposure process in which a plurality of conductors are juxtaposed, an insulating film is bonded to both sides of the parallel surface, and the conductor in a portion that becomes a connection end is exposed,
A sticking step of attaching a heat-resistant insulating film having a higher heat resistance than the insulating film to one surface of the parallel surfaces of the exposed conductors of the connection end portion,
A terminal fixing step of fixing the terminal to the other side of the parallel surface of the conductor;
A terminal insertion step of inserting the terminal into the connector housing;
The manufacturing method of the flexible flat cable which has this.   The said exposure process is a manufacturing method of the flexible flat cable of Claim 3 which is a process of sticking the said insulating film on the part except the connection edge part of the parallel surface of the said conductor.   4. The flexible flat cable according to claim 3, wherein the exposing step is a step of removing the insulating film in a portion to be the connection end portion after the insulating film is bonded to both sides of the parallel surface of the conductor. Production method.   The said terminal is connected by the connection part, The said terminal adhering process is a process of adhering all the said terminals to the other surface of the parallel surface of the said conductor simultaneously with the said connecting part. A manufacturing method of the flexible flat cable according to 1.   The affixing step is a step of affixing one heat-resistant insulating film in common to one side of the parallel surfaces of all the conductors, and after the terminal adhering step, the heat-resistance between the terminals The manufacturing method of the flexible flat cable of Claim 6 which has a terminal isolation | separation process which cuts off a conductive insulating film and the said connection part. The connector housing includes a partition that separates the terminals between terminal accommodating portions, and the terminal insertion step includes a step of inserting the partition into the location where the heat-resistant insulating film and the connecting portion are cut off in the terminal separation step. The method for producing a flexible flat cable according to claim 7.

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