JP2008041451A - Shielded flat cable and manufacturing method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shielded flat cable with proper contact between a ground wire and a shield layer and capable of obtaining ample shielding effects, and to provide its manufacturing method. <P>SOLUTION: The manufacturing method of a shielded flat cable 1 comprises an arrangement process for arranging a plurality of rectangular conductors 2 on a flat plane with a parallel pitch P, a first insulator adhesion process for adhering a first insulating film 3 on the rectangular conductors 2, a cutting process for cutting a long flat cable 1A to make a short flat cable 1B, a shielding layer adhesion process for adhering a shielding layer 9 on the outside of the flat cable 1b, and a connection process for electrically connecting the ground wire 2a and the shielding layer 9. In the first insulator adhesion process, a window part 6 of the width of the parallel pitch P or larger on which the first insulating film 3 is not adhered is formed on the ground wire 2a and a second insulator adhesion process, in which a second insulating film 11 is adhered on the conductor other than the ground wire 2a in the window part 6, is carried out prior to the shielding layer adhesion process. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

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

  As electronic devices become smaller and lighter, electronic components and wiring components mounted on these devices are becoming smaller. In particular, wiring members for electrical wiring are required to be capable of high-density wiring in a limited space. As such wiring members, there are a flexible circuit board, a flat cable using a flat conductor, an electrical connector used for connecting them, and the like. For in-machine wiring of products that require noise countermeasures, such as consumer equipment such as audio and video, OA equipment such as printers, scanners, and copiers, wiring for DVD, CD-ROM, MO, PC, and other electronic devices A shielded flat cable with a shielding function is used.

  A flat cable is obtained by arranging a plurality of flat conductors on one plane and laminating insulating films from both sides of the arrangement surface. In the case of a shielded flat cable, a shield layer such as a metal foil is provided outside the laminated insulating film. A part of the plurality of flat conductors is a ground wire, and the ground wire and the shield layer are electrically connected.

  For example, in the shielded flat cable described in Patent Document 1, as shown in FIG. 11, a plurality of flat rectangular conductors 112 are arranged in a horizontal row in parallel with each other at an equal pitch, and the upper and lower sides thereof are insulative adhesive layers. 116 and an insulating layer 114 are covered with a plastic film (insulating film) to form a flat cable 110. The flat cable 110 has an outermost layer as an insulating layer 122 such as PET and a middle layer as a metal layer such as Cu or Al (shield). Layer) 124, and a shield coating tape 120 having an innermost layer as an insulating adhesive layer 126 is covered. Among the rectangular conductors 112, the left and right ends are ground conductors (ground lines) 112a. As shown in FIG. 12, the shield flat cable is provided with a plurality of joints 121 in the longitudinal direction at a location above the ground conductor 112a. In the joint portion 121, the metal layer 124 of the shield coating tape 120 is directly connected to the ground conductor 112a without the insulating adhesive layer 126 interposed therebetween.

  When manufacturing this shielded flat cable, before laminating the plastic film, the insulating adhesive layer 116 and the insulating layer 114 corresponding to the portion immediately above the ground conductor 112a are previously punched with a mold or the like, or Then, after laminating the plastic film and before laminating the shield coating tape 120, holes are made in advance in the portions of the insulating adhesive layer 116 and the insulating layer 114 that are directly above the ground conductor 112a with a laser or the like. Then, the metal layer 124 of the shield coating tape 120 and the ground conductor 112a are electrically connected at the hole portion.

JP 2005-93178 A

  When laminating an insulating film on a flat conductor, it is arranged so that a plurality of long rectangular conductors run in a state where they are aligned on a flat surface, and the rectangular conductor is sandwiched while running a long insulating film accordingly. Paste from both sides of the surface. Therefore, when a hole is made in the insulating film before laminating as described above, a laminator (due to a positional deviation of the traveling flat conductor, a positional deviation of the traveling insulating film, a positional deviation of the hole in the insulating film, etc. It is difficult to accurately align the position of the hole on the ground line at the position of the bonding portion), which may shift in the width direction. For example, when the parallel pitch of the rectangular conductors is 0.5 mm and the amount of positional deviation in the width direction is 0.2 mm or more, the rectangular conductors (signal lines and feeders) other than the ground line are connected to the shield layer and grounded. Will be.

  Moreover, even if a hole is made with a laser after laminating the insulating film, a resin wrinkle may appear inside the hole, and the hole may not be completely opened. In particular, this problem becomes prominent when the adhesive layer of the insulating film is polyester. If the formation of the hole is incomplete, a contact failure between the ground line and the shield layer occurs, and the grounding of the shield layer becomes insufficient. Insufficient grounding of the shield layer makes it impossible to obtain sufficient shield characteristics such as easy noise. In particular, if the parallel pitch of the flat conductors is narrow (0.5 mm or less), the opening of the hole is narrow, and there is a high possibility that the contact will be hindered by the wrinkles.

  Therefore, an object of the present invention is to provide a shielded flat cable in which the contact between the ground wire and the shield layer is good and the shield layer is securely grounded, and a method for manufacturing the shielded flat cable.

  In the shielded flat cable according to the present invention capable of solving the above-mentioned problems, a plurality of rectangular conductors including a conductor which is a ground wire are arranged on a plane at a predetermined parallel pitch, and from both sides of the arrangement surface of the rectangular conductors An insulating film including a first insulator attached to the flat conductor, and a shield flat cable having a shield layer attached to the outside of the insulating film, and a part other than the longitudinal end of the shield flat cable In addition, at least the ground film has a window portion with a width equal to or greater than the parallel pitch, and the flat conductor other than the ground wire is covered with a second insulator. The ground line is electrically connected to the shield layer.

  In the shielded flat cable of the present invention, it is preferable that the window portion is formed over the entire width of the insulating film.

  The method for manufacturing a shielded flat cable according to the present invention capable of solving the above-described problems includes an arranging step of arranging a plurality of flat conductors including a conductor as a ground wire on a plane at a predetermined parallel pitch, and the flat conductor A first insulator adhering step of forming an elongated flat cable by adhering an insulating film containing a first insulator to the flat conductor from both sides of the arrangement surface, and cutting the elongated flat cable to obtain a predetermined length A cutting step of a flat cable having a length, a shield layer attaching step of attaching a shield layer to the outside of the flat cable after the cutting step, and a connecting step of electrically connecting the ground wire and the shield layer A method of manufacturing a shielded flat cable having a longitudinal direction of the flat cable by cutting in the cutting step in the first insulator pasting step A conductor exposed portion in which all the rectangular conductors are exposed at a portion to be a portion, and at least a part of the longitudinal direction other than the conductor exposed portion, at least the parallel pitch not sticking the insulating film to the ground wire And a second insulator covering step of covering the rectangular conductor other than the ground wire in the window with a second insulator before the shield layer attaching step.

In the method for producing a shielded flat cable of the present invention, it is preferable that the window portion is formed by continuously sticking the insulating film having a window portion opened in advance along the longitudinal direction of the rectangular conductor.
Alternatively, the window portion is preferably formed by intermittently attaching a plurality of the insulating films along the longitudinal direction of the rectangular conductor.

  In the method for manufacturing a shielded flat cable according to the present invention, a plurality of the rectangular conductors are connected and integrated by a conductive member between the first insulator attaching step and the cutting step, and the conductors are electrically connected. It is preferable to perform a plating step in which electroplating is performed on the rectangular conductor in the conductor exposed portion by immersing the exposed portion in a plating solution.

According to the present invention, a portion having a width equal to or larger than the parallel pitch of the rectangular conductors is not attached to the portion where the ground wire and the shield layer are electrically connected so that the insulating film containing the first insulator is not attached to the ground wire. A window portion is formed, and insulating films are adhered to both sides of the flat conductor arrangement surface. Since the windows have a width equal to or greater than the parallel pitch, even if there is a slight misalignment in the width direction when the first insulator is attached to the array surface of the running flat conductors, The window portion can be reliably disposed on the shield layer, and the shield layer can be reliably grounded without interfering with the connection of the shield layer to the ground line after the shield layer is attached.
Further, the flat conductor other than the ground wire in the window is covered with the second insulator to prevent contact between the shield layer and the flat conductor other than the ground wire. After a long flat cable having an insulating film attached to a flat conductor is cut to a predetermined length, the individual flat cable is securely positioned and then covered with the second insulator so that the second insulator is covered. The positional accuracy at the time is much higher than the positional accuracy at the time of attaching the insulating film. Therefore, while covering the ground wire with the second insulator, the flat conductor other than the ground wire can be reliably covered with the second insulator.

Hereinafter, an example of an embodiment of a shield flat cable and a manufacturing method for the same according to the present invention will be described with reference to the drawings.
1 is a plan view showing a shielded flat cable according to the present invention, FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, and FIG. 3 is a cross-sectional view taken along line BB in FIG.

  As shown in FIGS. 1 to 3, the shielded flat cable 1 includes a plurality (ten in this embodiment) of flat conductors 2, and these flat conductors 2 are arranged on a plane at a predetermined parallel pitch. A first insulating film 3 including a first insulator is bonded (laminated) to both surfaces of the arrangement surface of the conductors 2. A shield film 7 having a shield layer 9 is attached to the outside of the first insulating film 3. Both ends in the longitudinal direction of the shielded flat cable 1 are conductor exposed portions 15 in which the first insulating film 3 is stuck only on one surface and a plurality of flat conductors 2 are exposed on the other surface. It functions as a connection terminal that can be connected to an elastic contact piece or the like of an electrical connector. Further, a terminal reinforcing tape 14 made of an insulating resin such as polyester is attached to the surface of the conductor exposed portion 15 where the flat conductor 2 is not exposed, and the exposed flat conductor 2 is supported and deformed. It is preventing.

  Moreover, the window part 6 is provided in the 1st insulating film 3 in a part of the longitudinal direction of the shield flat cable 1 except the conductor exposed part 15. In the portion excluding the conductor exposed portion 15 and the window portion 6, the first insulating film 3 is adhered to both surfaces of the flat conductor 2, but in the window portion 6, the first insulating film 3 is attached to one surface of the flat conductor 2. It is not attached. Among the ten flat conductors 2, ground wires 2a are arranged at both ends in the parallel width direction. The flat conductor 2 other than the ground wire 2a is a signal line or a power supply line. In the window portion 6, a second insulating film 11 including a second insulator is attached to the flat conductor 2 other than the ground wire 2a.

The flat conductor 2 has a structure in which a tin plating layer is laminated on a copper base formed in a rectangular cross section. In this embodiment, the tin plating layer is formed in the whole outer periphery of a copper base material. Copper or copper alloy is used as the copper base material. Moreover, in the conductor exposed part 15 used as a connection terminal, since the acicular crystal | crystallization (whisker) may generate | occur | produce on the surface of the flat conductor 2 due to receiving the compressive stress for an electrical contact, generation | occurrence | production of a whisker is generated. In order to suppress this, the rectangular conductor 2 is plated with gold. By applying the gold plating, whiskers are not generated, and the reliability of electrical connection between the flat conductor 2 and the electrical connector is improved without short-circuiting the flat conductors 2 arranged at a narrow pitch.
In this embodiment, the thickness of the flat conductor 2 is 0.035 mm, the width W3 of the flat conductor 2 is 0.3 mm, and the parallel pitch P of the ten flat conductors 2 is 0.5 mm.

  The first insulating film 3 includes an insulating resin layer 5 that is a first insulator and an insulating adhesive layer 4. For example, the insulating resin layer 5 is a resin such as polyester, polyimide, or PPS, and the insulating adhesive layer 4 includes Polyester adhesive or flame retardant PVC. Two first insulating films 3 are bonded to the flat conductor 2 with the surface of the insulating adhesive layer 4 facing the flat conductor 2. Thus, electrical insulation between the rectangular conductors 2 is achieved.

  The shield film 7 includes a conductive adhesive layer 8, a shield layer 9, and a resin layer 10. For example, the conductive adhesive layer 8 is a conductive filler-containing adhesive, the shield layer 9 is aluminum or copper, and the resin layer 10 Is a polyester such as PET. The conductive adhesive layer 8 achieves a good conductive connection between the shield layer 9 and the ground wire 2a, and the shield layer 9 causes the shield flat cable 1 to have a shielding effect. The resin layer 10 prevents peeling and corrosion of the shield layer 9, and maintains the reliability of the shield flat cable 1.

  As shown in FIGS. 2 and 3, the shield film 7 is wound and adhered so as to cover the entire circumference of the shield flat cable 1. You may stick together.

  As shown in FIG. 2, the first insulating film 3 is attached to all the flat conductors 2 in most of the longitudinal direction of the shield flat cable 1, but the shield flat cable 1 is shield flat as shown in FIGS. In a part of the cable 1 in the longitudinal direction, a window portion 6 to which the first insulating film 3 is not attached is provided on one surface. The window 6 has a width in the width direction that is at least equal to or more than the parallel pitch P of the rectangular conductors 2. In this embodiment, the full width of the first insulating film 3 attached to the parallel rectangular conductors 2. Over. In the window 6, the ground wire 2a is electrically connected to the shield layer 9 by bonding the conductive adhesive layer 8 of the shield film 7, and the rectangular conductor 2 other than the ground wire 2a is used as a masking film for the second insulating film. 11 is affixed.

  The second insulating film 11 can be the same as the first insulating film 3. For example, the second insulating film 11 includes an insulating resin layer 13 that is a second insulator and an insulating adhesive layer 12. The insulating resin layer 13 is a resin such as polyester, polyimide, or PPS, and the insulating adhesive layer 12 is a polyester. It is a system adhesive or flame retardant PVC. The two second insulating films 11 are bonded to the flat conductor 2 other than the ground wire 2a located in the window portion 6 with the surface of the insulating adhesive layer 12 facing each other. Thereby, the rectangular conductors 2 other than the ground wire 2a are electrically insulated from each other, and the rectangular conductor 2 and the shield layer 9 are electrically insulated.

  The 2nd insulator should just be what can insulate the flat conductor 2 of the signal wire | line and electric power feeding line exposed at the window part 6, and is not restricted to the form of a film. For example, an insulating material such as ink or a coating material can be used as the second insulator.

  In addition, when the insulating resin layers 5 and 13 of the first insulating film 3 and the second insulating film 11 are polyimide, the shape accuracy of the film is good, and the window portion 6 and the like can be formed with high accuracy.

  When a specific configuration example of the shielded flat cable 1 shown in FIGS. 1 to 3 is given, the length L1 of the window portion 6 = 6 mm, the length L2 of the second insulating film 11 = 10 mm, and the width W1 of the window portion 6. = (Number of conductors N-3) × parallel pitch P ± 0.05 mm, width W2 of second insulating film 11 = (number of conductors N + 1) × parallel pitch P ± 0.05 mm. N is the total number of rectangular conductors 2 including the ground line 2a.

  Examples of the material and thickness of the second insulating film 11 include 0.035 mm thick polyimide tape, 0.022 mm thick polyester tape, 0.020 mm thick PPS tape, 0.025 mm thick polyimide tape, and the like. Can be illustrated. An acrylic resin can also be used for the insulating adhesive layer 12 of the second insulating film 11.

  Next, the manufacturing method which manufactures the shielded flat cable 1 of the said structure is demonstrated along the procedure.

  First, a plurality (10 in this embodiment) of rectangular conductors 2 (including the ground wire 2a) having a rectangular cross section in which a tin plating layer is formed on the surface of a copper base material are prepared.

  Next, as shown in FIG. 4, the rectangular conductors 2 are sent out from a plurality of reels 30 around which the long rectangular conductors 2 are wound, and are arranged on the same plane at a predetermined parallel pitch P (arrangement step). Then, the long first insulating film 3 is fed from the reel 31 to the top and bottom of the flat conductor 2 and passed between the heater rollers 32 and wound around the take-up roller 33 (first insulator pasting step).

  At the time of a 1st insulator sticking process, let the mutually opposing surface of the 1st insulating film 3 be the insulating contact bonding layer 4 side. That is, by passing between the heater rollers 32, the insulating adhesive layer 4 of the first insulating film 3 is melted, and the first insulating film 3 is formed from the front and back of the plurality of flat conductors 2 arranged on the plane. A series of long flat cables are formed which are bonded together by the insulating adhesive layer 4 and the flat conductors 2 are arranged on a plane and covered with insulating resin (insulating resin layer 5 and insulating adhesive layer 4).

  Here, a part of the long flat cable 1A is shown in FIG. The long flat cable 1A has a conductor exposed window portion 15a and a window portion opened in a part in the longitudinal direction of one first insulating film 3 in order to provide the conductor exposed portion 15 and the window portion 6 shown in FIG. 6 is formed. The conductor exposed window portion 15a is provided at a location that is an end portion in the longitudinal direction of the shield flat cable 1, and the window portion 6 is a location other than the conductor exposed window portion 15a, for example, a substantially central portion in the longitudinal direction of the shield flat cable 1. It is provided in the place. The width W4 of the conductor exposed window 15a is larger than the parallel width of the flat conductors 2 so that all the flat conductors 2 are exposed, and the width W1 of the window 6 is at least on the ground line 2a and the first insulating film 3. Is set to have a width equal to or greater than the parallel pitch P at the position on the ground line 2a. In this embodiment, W1 and W4 are set to the same width. That is, in this embodiment, the window 6 is also opened in a shape that does not attach the first insulating film 3 to all the flat conductors 2.

When sticking the 1st insulating film 3 to the flat conductor 2, the position of the 1st insulating film 3 and the flat conductor 2 may shift | deviate in the width direction. If the width W1 of the window portion 6 is smaller than the shift amount, the ground wire 2a is covered with the first insulating film 3 and is not exposed. Therefore, the width W1 of the window portion 6 is set to be larger than the shift amount. To do. The laminator as shown in FIG. 4 is usually designed with precision so that the positional deviation during the bonding of the first insulating film 3 is less than the parallel pitch P of the rectangular conductors 2 at the maximum. Therefore, in this embodiment, the width W1 of the window portion 6 is set to a width of at least the parallel pitch P, and when the first insulating film 3 is stuck, the positions of the first insulating film 3 and the flat conductor 2 are somewhat in the width direction. Even if it deviates, it is prevented that the 1st insulating film 3 adheres to the ground wire 2a in the position of the window part 6 in a longitudinal direction. Therefore, the electrical connection between the ground line 2a and the shield layer 9 can be reliably performed in a later process.
In addition, the length L1 of the window portion 6 is preferably set to be equal to or less than half the length of the shield flat cable 1 in order to sufficiently obtain the insulating effect by the first insulating film 3. A plurality of window portions 6 may be provided in the longitudinal direction of shield flat cable 1.

  Thus, in the said 1st insulator sticking process, sticking the 1st insulating film 3 which has the window part 6 previously opened and the conductor exposure window part 15a along the longitudinal direction of the flat conductor 2 continuously. Thus, the conductor exposed window portion 15a and the window portion 6 are formed. As shown in FIG. 6, the short first insulating film 3 is intermittently attached along the longitudinal direction of the flat conductor 2. The conductor exposed window 15a and the window 6 may be formed.

  After the first insulator sticking step, the first insulating film 3 is cut at a position indicated by a broken line C1 shown in FIGS. 5 and 6 in order to remove an excess portion (a portion called an ear) in the width direction of the first insulating film 3. . Thereby, the location where the 1st insulating film 3 was connected to the longitudinal direction in the width direction both ends of the window part 6 and the conductor exposure window part 15a is removed.

When performing plating such as gold plating on the flat conductor 2 of the conductor exposed portion 15, the plating process is performed with the long flat cable as it is.
In this plating step, as shown in FIG. 7, the flat conductor 2 exposed to the conductor exposed portion 15 of the long flat cable 1 </ b> A by intermittently feeding and immersing the long flat cable 1 </ b> A into the plating solution tank 20. Has been electroplated. In order to attach the plating metal to the exposed rectangular conductor 2, at least one conductor exposed portion 15 is connected and integrated by the conductive members 23 intersecting with all the exposed rectangular conductors 2 to be electrically connected. When the long flat cable 1A is immersed in the plating solution, the conductive member 23 is connected to the negative potential side of the plating power source 21 with an electric clip or the like outside the plating solution, and the plating metal material 22 immersed in the plating solution is used as the plating power source 21. Connect to the positive potential side.

  The long flat cable 1 </ b> A may be continuously immersed in the plating solution tank 20 so as to be immersed in the plating solution tank 20 (continuous plating).

  The plating applied to the conductor exposed portion 15 is for suppressing the generation of whiskers at the terminal portion or for improving the reliability of the electrical connection between the terminal portion and the electric connector, and preferably is plated with gold. . However, if gold plating is directly performed on tin plating, there is a possibility that electrolytic corrosion due to contact with dissimilar metals may occur and it cannot be used for a long time. For this reason, it is preferable to perform gold plating after nickel plating as a base metal.

  In the plating process, not only the conductor exposed portion 15 but also the window portion 6 may be plated. In that case, the long flat cable 1A can be continuously fed into the plating bath 20 and immersed therein, which is efficient. Or you may plate continuously in the state which masked the window part 6 with the tape etc. temporarily.

  The long flat cable 1A formed in this way is cut at a position indicated by a broken line C2 in the conductor exposed portion 15 shown in FIGS. 5 and 6, and a flat cable 1B having a predetermined length as shown in FIG. (Cutting step).

  The flat cable 1B of FIG. 8 obtained by cutting the long flat cable 1A is attached with the terminal reinforcing tape 14 so as to support the flat conductor 2 on one surface of the conductor exposed portion 15 as shown in FIGS. To do.

Next, as shown in FIG. 10, a second insulating film 11 is attached to a portion of the window 6 other than the ground wire 2 a so as to cover the flat conductor 2 other than the ground wire 2 a (second insulation). Body covering step). The second insulating film 11 is attached by thermal attachment. Since the operation of attaching the second insulating film 11 is performed individually for the short flat cable 1B, unlike the first insulator attaching step, for example, the second insulating film 11 is attached in a state where the flat cable 1B is placed. The insulating film 11 can be attached. Therefore, when attaching, the 2nd insulating film 11 can be stuck in an exact position, without the flat cable 1B and the 2nd insulating film 11 shifting.
Moreover, it is also possible to stick the second insulating film 11 so as not to reach the ground line 2a while fixing the flat cable 1B and confirming the position of the ground line 2a. In this case, the second insulating film 11 can be attached with higher positional accuracy.

  Further, in this embodiment, among the ten flat conductors 2, the conductors disposed at both ends in the parallel width direction are the ground lines 2 a, but in this case, other than the ground lines 2 a as shown in FIG. 10. In order to cover the flat conductor 2, one second insulating film 11 may be attached to one window portion 6. On the other hand, when the rectangular conductor 2 other than both ends in the width direction is used as the ground wire 2a, is a plurality of second insulating films 11 adhered to one window portion 6 so as to open the ground wire 2a? Alternatively, one second insulating film 11 having a window is attached to the portion of the ground wire 2a.

  After the second insulator covering step, as shown in FIGS. 1 to 3, the shield film 7 is stuck to a portion excluding the conductor exposed portion 15 and its vicinity (shield layer sticking step). For the sticking of the shield film 7, one sheet may be wound or two sheets may be bonded together. When the shield film 7 is attached, the shield layer 9 of the shield film 7 is electrically connected to the ground wire 2a at a location where the second insulating film 11 is not attached in the window 6 (connection process).

  In this embodiment, since the conductive adhesive layer 8 is provided on the shield film 7, the conductive adhesive layer 8 enters the window portion 6 and contacts the ground wire 2 a during the shield layer sticking step, and the shield layer A connection process is performed simultaneously with the sticking process. When the conductive adhesive layer 8 is not provided, it is necessary to connect the shield layer 9 to the ground line 2a by welding or the like after the shield layer attaching step. When the shield film 7 has the conductive adhesive layer 8, the gap between the shield layer 9 and the ground line 2a is filled with the conductive adhesive layer 8, so that a good connection state is easily obtained.

  In the above embodiment, the window portion 6 is provided on one side of the shielded flat cable 1, but it may be on both sides. Moreover, you may provide the several window part 6 in one surface. Further, the shield layer may be provided only on one side of the shield flat cable 1.

  As described above, the shield flat cable 1 and the manufacturing method thereof according to the above embodiment are formed on the first insulating film 3 even when the sticking position of the first insulating film 3 is shifted in the width direction with respect to the parallel rectangular conductors 2 arranged in parallel. The width W1 of the window portion 6 is set to be equal to or larger than the parallel pitch P so as to be larger than the shift amount. Therefore, the window part 6 can be reliably arrange | positioned on the ground line 2a, and the location which connects a shield layer with respect to a ground line is not plugged up. In addition, since the second insulating film 11 can be positioned and adhered with high accuracy, the second insulating film 11 is prevented from adhering to the ground wire 2a, while being securely attached to the flat conductor 2 other than the ground wire 2a. The 2nd insulating film 11 can be stuck to. Therefore, the shield flat cable 1 that can reliably ground the shield layer 9 can be obtained.

  There is also a shielded flat cable in which ground wires are stacked and arranged, and the outer ground wire is folded back at the exposed conductor and connected to the shield layer. In that case, even if continuous plating is applied as in the above embodiment Since it is not possible to apply plating to the inner ground wire portion, it is necessary to perform plating after cutting the wire into short pieces and turning back the ground wire. On the other hand, the shielded flat cable 1 of the above embodiment can be efficiently plated by continuous plating.

It is a top view of the shield flat cable of this embodiment. It is arrow AA sectional drawing of FIG. It is arrow BB sectional drawing of FIG. It is a typical perspective view showing the 1st insulator pasting process in the manufacturing method of this embodiment. It is a top view which shows the elongate flat cable after the 1st insulator sticking process in the manufacturing method of this embodiment. It is a top view which shows the other example of the elongate flat cable after the 1st insulator sticking process in the manufacturing method of this embodiment. It is a schematic diagram which shows the plating process in the manufacturing method of this embodiment. It is a top view which shows the flat cable after the cutting process in the manufacturing method of this embodiment. It is a partial side view of FIG. It is a top view which shows the flat cable after the 2nd insulator coating | coated process in the manufacturing method of this embodiment. It is sectional drawing which shows an example of the conventional shield flat cable. It is sectional drawing of the other part of the shield flat cable shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shield flat cable 1A Long flat cable 1B Flat cable 2 Flat conductor 2a Ground wire 3 1st insulating film 6 Window part 7 Shield film 9 Shield layer 11 2nd insulating film 15 Conductor exposure part

Claims (6)

A plurality of flat conductors including a conductor that is a ground wire are arranged on a plane at a predetermined parallel pitch, and an insulating film containing a first insulator is attached to the flat conductor from both sides of the flat conductor arrangement surface, A shield flat cable having a shield layer adhered to the outside of the insulating film,
In a portion other than the longitudinal direction end of the shielded flat cable, at least the ground film has a window portion with a width equal to or greater than the parallel pitch on which the insulating film is not attached,
In the window portion, a flat conductor other than the ground wire is covered with a second insulator, and the ground wire is electrically connected to the shield layer. The shielded flat cable according to claim 1,
The said window part is formed over the full width of the said insulating film, The shield flat cable characterized by the above-mentioned. An arrangement step of arranging a plurality of flat conductors including a conductor as a ground wire on a plane at a predetermined parallel pitch, and attaching an insulating film containing a first insulator to the flat conductor from both sides of the flat conductor arrangement surface. A first insulator adhering step of forming a long flat cable by wearing, a cutting step of cutting the long flat cable into a flat cable of a predetermined length, and an outer side of the flat cable after the cutting step A method for producing a shielded flat cable having a shield layer attaching step for attaching a shield layer to the wire, and a connecting step for electrically connecting the ground line and the shield layer,
In the first insulator pasting step, a conductor exposed portion that exposes all the rectangular conductors is provided at a portion that is cut in the cutting step and becomes a longitudinal end portion of the flat cable, and other than the conductor exposed portion Forming a window portion having a width equal to or greater than the parallel pitch and not attaching the insulating film to at least the ground wire in a part of the longitudinal direction of
A method for manufacturing a shielded flat cable, comprising performing a second insulator covering step of covering a flat conductor other than the ground wire in the window portion with a second insulator before the shield layer attaching step. It is a manufacturing method of the shield flat cable according to claim 3,
The said window part forms the said insulating film which has a window part opened beforehand previously, and sticks it along the longitudinal direction of the said flat conductor, The manufacturing method of the shield flat cable characterized by the above-mentioned. It is a manufacturing method of the shield flat cable according to claim 3,
The said window part is a manufacturing method of the shield flat cable characterized by sticking a plurality of said insulating films intermittently along the longitudinal direction of the said flat conductor. A method for manufacturing a shielded flat cable according to any one of claims 3 to 5,
Between the first insulator sticking step and the cutting step, the conductors are formed by connecting and integrating a plurality of the flat conductors with a conductive member and immersing the exposed conductor in a plating solution. A method for producing a shielded flat cable, comprising performing a plating step of electroplating a flat conductor in an exposed portion.

Images