JP5162220B2 - Shielded flat cable and method for manufacturing the same - Google Patents

Description

  The present invention relates to a shielded flat cable (shielded FFC) and a method for manufacturing the same, and particularly to a shielded conductor capable of effectively performing electrolytic gold plating on a lead portion of a flexible flat cable (FFC) with a drain wire. The present invention relates to a flat cable and a manufacturing method thereof.

  In a conventional shielded flexible flat cable (hereinafter simply referred to as “shielded FFC”), as shown in Patent Document 1, two drain wires are folded back at the end of the shielded FFC and contacted with the shield material. A method of letting the shield drop to the ground is generally known.

In addition, as shown in Patent Document 2, a method of applying gold plating only to an end portion of an FFC laminated with a flat nickel-plated conductor is generally used for the purpose of preventing whiskers generated from a flat tin-plated conductor of an FFC with a shield. Is.
Japanese Patent Laid-Open No. 5-242736 JP-A-8-293214

  By the way, in the conventional shielded FFC, in the shielded FFC having a structure as shown in Patent Document 1, the drain wire is folded back after being cut into a short length (product) to be brought into contact with the shield material. As a result, there is a problem that electrolytic gold plating cannot be performed in a long state.

  On the other hand, in order to perform gold plating on the terminal conductor of the shielded FFC having the structure as shown in Patent Document 1, for example, as shown in Patent Document 2, only the conductor portion of the terminal is gold-plated in a long state. When processed, the gold plating is performed in a state where the two drain line conductors are overlapped, so that there is a problem that the gold plating does not adhere to the portion where the two drain line conductors overlap.

  It is an object of the present invention to effectively perform electrolytic gold plating on a lead portion of a conductor of a shielded flat cable.

  In order to solve the above-mentioned problems, a shielded flat cable according to the present invention includes a plurality of conductors arranged substantially parallel to each other and two conductors for drain wires superposed in parallel to the plurality of conductors. A tape-like insulator laminated from above and below to the plurality of conductors and the above-mentioned superimposed drain wire conductor, and a window is provided in at least one of the insulators in the longitudinal direction of the insulator. The conductor exposed portion in a state in which one of the two exposed conductors for the drain line is folded back and the other conductor for the drain line is exposed. A gold plating applied to the plurality of conductors and the drain wire conductor, and a shield material laminated to one of the insulator surfaces so as to be grounded to the folded one drain wire conductor; In which it characterized in that it is configured.

  In the production method for a shielded flat cable according to the present invention, in a production line for a shielded flat cable, a plurality of conductors and two superimposed conductors for drain wires are arranged in parallel and substantially parallel to each other. When laminating with an insulator, at least one of the insulators is provided with a window portion at a desired interval to form a conductor exposed portion that becomes a terminal portion of the shielded flat cable, and the conductor exposed portions are overlapped 2 Only one drain line conductor of the two drain line conductors is cut almost in the middle of the length direction, and the cut one drain line conductor is folded back to the surface of the insulator and the other drain line conductor is cut. After exposing the line conductor and temporarily fastening the folded one drain line conductor to the surface of the insulator, a plurality of conductors and drains in the conductor exposed portion The wire conductor is plated with gold, and a shield material is laminated on the surface of one of the insulators so as to be grounded to the one of the folded drain wire conductors. It is characterized by cutting with.

  As can be understood from the means for solving the above problems, according to the shielded flat cable of the present invention, the gold plating process is performed in a state in which only one of the two superimposed conductors for the drain line is folded. By doing so, all the conductors including the other exposed conductor of the exposed conductor (exposed portion of the conductor) can be reliably plated with gold, and the one folded conductor of the drain line Can be grounded to the shield material.

  Further, according to the method for manufacturing a shielded flat cable of the present invention, in the production line, only one of the two superimposed conductors for the drain line is cut and folded, so that the gold plating is performed. Gold plating can be efficiently applied to all conductors including the other drain wire conductor in the exposed portion (conductor lead-out portion). Further, the shield material is laminated on one of the insulator surfaces so as to be grounded to one of the folded conductors for the drain line, and then cut substantially in the middle of the length direction of each of the conductor exposed portions. The shielded flat cable can be efficiently manufactured.

  Embodiments of the present invention will be described below with reference to the drawings.

  Referring to FIGS. 1A to 1C, a shielded flat cable 1 (shielded FFC) according to this embodiment includes, for example, flat rectangular nickel-plated conductors as a plurality of conductors 3 arranged substantially in parallel. And the two conductors for drain lines 5 and 7 superimposed in parallel with the plurality of conductors 3 and the plurality of conductors 3 and the conductors for drain lines 5 and 7 superimposed above. For example, insulating tapes 9 and 11 as tape-like insulators laminated from above and below in 1 (B) and 1 (C) and the insulating tape 9 on both sides of the insulating tapes 9 and 11 are provided with windows 13. Conductor exposed portion 15 (conductor lead-out portion) and the upper drain line conductor 5 out of the two drain wire conductors 5 and 7 superimposed on the conductor exposed portion 15 to return the lower drain Wire guide 7 and the gold plating 17 applied to the plurality of conductors 3 and the drain line conductor 7 of the conductor exposed portion 15 and the upper drain line conductor 5 that is folded back, and the upper drain line conductor 5 that is folded back. And a shielding material 19 laminated on the surface of the upper insulating tape 9 so as to be grounded.

  In FIG. 1A, four rows of conductors 3 are shown, but in reality, a large number of rows of conductors 3 such as 10 to 20 rows are provided. In FIG. 1A, the gold plating 17 is omitted in order to distinguish between the conductor 3 and the upper and lower drain wire conductors 5 and 7.

  As another embodiment, when the window 13 is provided in the insulating tape 11 below the both ends of the insulating tapes 9 and 11 to form the exposed conductor 15, the conductor exposed portion 15 for the drain line is formed. The lower drain line conductor 7 of the conductors 5 and 7 is folded, and the shield material 19 is laminated on the surface of the lower insulating tape 11 so as to be grounded to the folded drain line conductor 7. .

  Alternatively, when the window 13 is provided in the upper and lower insulating tapes 9 and 11 at both ends of the insulating tapes 9 and 11 to form the conductor exposed portions 15, either one of the drain wire conductors 5 and 7 is folded back. good. For example, when the drain line conductor 5 is folded, the shield material 19 is laminated on the surface of the upper insulating tape 9 so as to be grounded to the folded drain line conductor 5. On the other hand, when the drain line conductor 7 is folded, the shield material 19 is laminated on the surface of the lower insulating tape 11 so as to be grounded to the folded drain line conductor 7.

  In the above-described embodiment, a rectangular nickel-plated conductor is used as the conductor 3. However, the conductor 3 having another cross-sectional shape or the conductor 3 to which other plating is applied can be applied.

  With the above configuration, the other of the conductor exposed portions 15 is exposed by performing gold plating in a state in which only one (or 7) of the two drain wire conductors 5 and 7 that are overlapped is folded back. Gold plating 17 is reliably applied to all the conductors 3 including the drain line conductor 7 (or 5), and one of the folded drain line conductors 5 (or 7) can be grounded to the shield material 19. .

  Next, a method for manufacturing the shielded flat cable 1 according to the embodiment of the present invention will be described with reference to the drawings.

  Referring to FIG. 2, as a method of manufacturing the shielded FFC 1, in the manufacturing line in the direction of the arrow, for example, a rectangular nickel-plated conductor as a plurality of conductors 3 and two drain line conductors 5 superimposed, In a state in which 7 are arranged in parallel, a long FFC 1 is formed by laminating with, for example, insulating tapes 9 and 11 as tape-like insulators from above and below. In FIG. 2, four rows of conductors 3 are illustrated, but actually, a large number of rows of conductors 3 such as 10 to 20 rows are provided.

  At this time, in the portion to be the terminal portion of the shielded FFC 1, window portions 13 are provided at a desired constant interval on the insulating tape 9 on the near side (upper side of the production line) with respect to the paper surface of FIG. A conductor exposed portion 15 is formed in the window portion 13 where the conductor 3 and the drain wire conductor 5 on the upper side of the production line (the front side in FIG. 2) are exposed.

  Referring to FIG. 3, only the upper drain line conductor 5 of the two drain line conductors 5, 7 superimposed on the conductor exposed portion 15 of the window 13 is cut. In this case, the drain line conductor 5 on the upper side of the window portion 13 is cut substantially in the middle in the length direction. As the cutting method, for example, a push cutter, an Oris cutter, or the like can be used.

  Referring to FIG. 4, the upper drain line conductor 5 cut in FIG. 3 is folded back to the surface of the upper insulating tape 9 of the long FFC 1.

  Referring to FIG. 5, the drain line conductor 5 folded in FIG. 4 is temporarily fixed to the surface of the upper insulating tape 9 with a temporary fixing tape 21 such as an adhesive tape. This is for preventing the folded drain wire conductor 5 from being floated or cut when gold plating is performed in the next step.

  Referring to FIG. 6, the long FFC 1 in the state of FIG. In this gold plating process, the current is passed through a gold plating electrolyte in a gold plating tank (not shown) on the production line while the FFC 1 is in a long state, and the state shown in FIGS. Similarly, a gold plating 17 having a predetermined thickness is applied. The gold plating 17 is also applied to each conductor 3 of the conductor exposed portion 15, the exposed drain line conductor 7, and the folded drain line conductor 5. 6 to 8, the gold plating 17 is omitted in order to distinguish between the conductor 3 and the upper and lower drain line conductors 5 and 7.

  Referring to FIG. 7, after the temporarily fixed temporary fixing tape 21 is peeled off, the shield material 19 is laminated on the surface of the upper insulating tape 9. At this time, the shield material 19 is laminated so as to be grounded to the upper drain line conductor 5 that is folded back.

  Referring to FIG. 8, the shielded flat cable 1 (shielded FFC) is manufactured by cutting at approximately the middle of the conductor exposed portion 15 in the length direction so that the final product shape of the shielded FFC 1 is obtained. .

  As described above, in the production line, only the upper drain line conductor 5 of the two superimposed drain line conductors 5 and 7 is cut and folded, and gold plating is performed. Electrolytic gold plating can be performed in the state of the FFC 1, and the gold plating 17 can be easily applied to all the conductors 3 including the lower drain wire conductor 7 where the conductor exposed portion 15 is exposed.

  In the above-described embodiment, the window 13 is provided in the upper insulating tape 9 at both ends of the insulating tapes 9 and 11 to form the conductor exposed portions 15. When the window 13 is provided on the tape 11 to form the conductor exposed portion 15, or the conductor exposed portion 15 is formed by providing the window portions 13 on both the upper and lower insulating tapes 9 and 11 at both ends of the insulating tape 9 and 11. Also in the case of forming, a point at which one of the two superimposed conductors 5 and 7 for drain lines is folded back, and a shield material 19 is laminated on the surface of any one of the insulating tapes 9 and 11 in accordance with this. However, it can be carried out in almost the same manufacturing process as that of the above-described embodiment.

1 shows a shielded flat cable according to an embodiment of the present invention, in which (A) is a plan view, (B) is a sectional view taken along line IB-IB in (A), and (C) is (A). It is sectional drawing of an arrow IC-IC line. It is a top view which shows the manufacturing process of the flat cable with a shield of embodiment of this invention. It is a top view which shows the manufacturing process of the flat cable with a shield following FIG. It is a top view which shows the manufacturing process of the flat cable with a shield following FIG. It is a top view which shows the manufacturing process of the flat cable with a shield following FIG. It is a top view which shows the manufacturing process of the flat cable with a shield following FIG. It is a top view which shows the manufacturing process of the flat cable with a shield following FIG. It is a top view which shows the manufacturing process of the flat cable with a shield following FIG.

Explanation of symbols

1 Flat cable with shield (FFC with shield)
3 Conductor 5 Drain wire conductor (upper side)
7 Drain wire conductor (bottom)
9 Insulation tape (upper tape-like insulator)
11 Insulation tape (lower tape-shaped insulator)
13 Window 15 Conductor Exposed 17 Gold Plating 19 Shielding Material 21 Temporary Fixing Tape

Claims (2)

  A plurality of conductors parallel to each other in parallel, two superimposed conductors for drain lines parallel to the plurality of conductors, and the plurality of conductors and the superimposed conductors for drain lines. A tape-like insulator laminated from above and below, a conductor exposed portion formed by providing a window on at least one of the insulators at both ends in the length direction of the insulator, and the conductor exposed portion overlapped 2 A plurality of conductors in the conductor exposed portion and the gold plating applied to the drain line conductor in a state where one of the drain line conductors is folded and the other drain line conductor is exposed; A shielded flat cable comprising: a shield material laminated to one of the surfaces of the insulator so as to be grounded to one of the drain wire conductors.   In a production line of a shielded flat cable, when laminating a plurality of conductors and two superimposed conductors for drain wires in parallel with each other in a substantially parallel manner with a tape-like insulator from above and below, at least one of the above-mentioned A window is provided in the insulator at a desired interval to form a conductor exposed portion serving as a terminal portion of the shielded flat cable, and one drain of the two conductors for the drain line superimposed on the conductor exposed portion Cut only the line conductor in the middle of its length direction, fold one of the cut drain line conductors on the surface of the insulator to expose the other drain line conductor, After temporarily fixing the drain wire conductor to the surface of the insulator, the plurality of conductors in the exposed conductor portion and the drain wire conductor are plated with gold, and the folded one drain A shielded flat cable characterized in that a shield material is laminated on the surface of one of the insulators so as to be grounded to a conductor for a wire, and then is cut approximately in the middle in the length direction of each conductor exposed portion. Production method.

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