JP2011103207A - Flexible flat circuit body - Google Patents

Abstract

To provide a flexible flat circuit body capable of improving rigidity at the time of bending deformation, thinning, and preventing disconnection of a conductor.
A conductor 3 and an elastic conductor 5 of a flexible flat circuit body 1 are collectively insulated by an insulating coating 7 over the entire length of the flexible flat circuit body 1, and the conductor 3 and the elastic conductor 5 are flexible. The flat circuit body 1 is disposed at the center in the thickness direction. The elastic conductor 5 has a predetermined rigidity and elasticity that does not cause buckling. When the flexible flat circuit body 1 is bent and deformed in the thickness direction, the rigidity and elasticity are the same regardless of the bending direction, and the rigidity is increased by the elastic conductor 5. Therefore, the bending radius at the bending deformation position is increased, buckling does not occur, and disconnection of the conductor 3 at the bending deformation position can be prevented. Since the conductor 3 and the elastic conductor 5 are not laminated, the flexible flat circuit body 1 can be thinned.
[Selection] Figure 2

Description

  The present invention relates to a flexible flat circuit body such as FC (Flat Cable) and FFC (Flexible Flat Cable) used for electrical wiring of electrical equipment and automobiles, and more specifically, a movable body such as a vehicle body and a door. The present invention relates to a flexible flat circuit body suitable as a wiring member spanned between the two.

  The side doors of vehicles such as one-box cars are equipped with one sliding door type sliding door or two sliding doors that move in the front-rear direction of the vehicle, and move away from each other when the door is released. What has been configured to do so has been proposed.

  These sliding doors are provided with a power window drive motor, a limit switch, and the like, and it is necessary to route a flexible flat circuit body from the vehicle body side to the sliding door in order to supply power to these devices.

  10 to 13 show an example of a conventional flexible flat circuit body, FIG. 10 is a perspective view schematically showing the configuration of the flexible flat circuit body, and FIGS. 11 to 13 are bending of the flexible flat circuit body. It is a side view which shows a deformation | transformation typically.

  The flexible flat circuit body 101 is configured by covering three strip-shaped flat conductors 103 with an insulating coating 105. The flexible flat circuit body 101 is routed between a vehicle body (not shown) and a slide door. As the slide tore opens and closes, the horizontal shape shown by the imaginary line in FIG. 11 is pulled in the direction of arrow A and bent as shown by the solid line, and the curved state shown by the imaginary line in FIG. It is pulled back to the horizontal shape as shown by the imaginary line.

  However, if the deformation as shown in FIGS. 11 and 12 and the return to the original shape are repeated, buckling 107 as shown in FIG. 13 occurs.

FIG. 14 shows a configuration of a flat cable disclosed in Patent Document 1 below.
The flat cable 111 is bridged between a vehicle body (not shown) and a slide toe. The flat cable 113 and the belt-shaped reinforcing member 115 are integrally covered with an insulating coating 117 and are reinforced. The member 115 extends along the length direction of the conductor 113, and the reinforcing member 115 and the conductor 113 are laminated in the thickness direction with an insulating coating 117 interposed therebetween.

JP 2007-109485 A

  As described above, the conventional flexible flat circuit body shown in FIGS. 10 to 13 has low rigidity of the circuit body itself and a small bending radius, so that it can be deformed from a flat shape to a flat shape. If it repeats, bending will generate | occur | produce in a deformation | transformation position and a conductor will be disconnected.

  On the other hand, the conventional flat cable shown in FIG. 14 can be improved in strength by a belt-shaped reinforcing member, but is bent when the flat cable is bent in the thickness direction because the conductor and the reinforcing member are laminated. The rigidity varies depending on the direction.

  Further, since the thickness of the flat cable is increased, the position of wiring is limited. Moreover, if a plurality of flat cables are stacked as necessary, the overall thickness increases, and a large space is required for routing.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a flexible flat circuit body which has high rigidity against bending deformation and can be formed thin.

The above object of the present invention is achieved by the following configurations.
(1) A flexible flat circuit body comprising a plurality of flat conductors and an insulating coating that collectively covers the plurality of flat conductors arranged in parallel on each other at a predetermined interval on a plane,
The conductor is disposed at the center in the thickness direction of the flexible flat circuit body;
A flexible flat circuit body, wherein at least one of the conductors is an elastic conductor having a predetermined rigidity and elasticity that does not cause buckling.

  (2) The flexible flat circuit body according to (1), wherein the elastic conductor is disposed on both sides in the width direction of the flexible flat circuit body, and the conductor is disposed between the elastic conductors. .

  (3) The flexible flat circuit body according to (1) or (2), wherein the conductor and the elastic conductor are alternately arranged along the width direction of the flexible flat circuit body.

  (4) In the above (1) or (3), the elastic conductor is disposed in the center in the width direction of the flexible flat circuit body, and the conductor is disposed on both sides thereof. Flexible flat circuit body.

  (5) The flexible flat circuit body according to (4) above, wherein the width of the elastic conductor is set larger than the width of the conductor.

  According to the configuration of (1) above, the conductor of the flexible flat circuit body is disposed at the center in the thickness direction of the flexible flat circuit body, and at least one of the conductors has rigidity and elasticity that does not cause buckling. Since it is an elastic conductor, the same rigidity and elasticity are given by the elastic conductor in any thickness direction of the flexible flat circuit body, and the bending radius when the flexible flat circuit body is deformed in the thickness direction is increased. Can do.

  According to the configuration of (2) above, the elastic conductors disposed at both ends in the width direction give the same rigidity and elasticity in any of the thickness directions, and deform the flexible flat circuit body in the thickness direction. The bending radius at the time of making can be enlarged.

  According to the configuration of (3) above, the same rigidity and elasticity are imparted in any of the thickness directions by the elastic conductors arranged alternately with the conductors along the width direction of the flexible flat circuit body. The bending radius when the flat circuit body is deformed in the thickness direction can be increased.

  According to the configuration of (4) above, the same rigidity and elasticity are imparted in any of the thickness directions by the elastic conductor disposed at the center in the width direction of the flexible flat circuit body. The bending radius when deforming in the thickness direction can be increased.

  According to the configuration of (5) above, since the width of the elastic conductor is set larger than the width of the conductor of the flexible flat circuit body, a large current can be obtained by increasing the cross-sectional area when the conductivity of the elastic conductor is low. Further, the same rigidity and elasticity are imparted in any thickness direction, and the bending radius when the flexible flat circuit body is deformed in the thickness direction can be increased.

  According to the flexible flat circuit body according to the present invention, the conductor is disposed at the center in the thickness direction of the flexible flat circuit body, and at least one of the conductors is an elastic conductor having higher elasticity and elasticity than the other conductors. As a result, the rigidity is higher than that of a flexible flat circuit body that does not include an elastic conductor, and the rigidity and elasticity in bending deformation are the same in any of the thickness directions, and the bending radius is increased.

  For this reason, even if the flexible flat circuit body is repeatedly bent and deformed in the thickness direction, the flexible flat circuit body does not buckle, and early disconnection of the conductor due to buckling can be prevented.

  And since it does not buckle even if a flexible flat circuit body is thin, a some flexible flat circuit body can be laminated | stacked and used.

1 is a perspective view showing a first embodiment of a flexible flat circuit body according to the present invention. It is sectional drawing of the flexible flat circuit body of FIG. It is a typical side view of the principal part which shows the bending deformation of a flexible flat circuit body. It is a typical side view of the principal part which shows a state without buckling at the time of return to the original shape of a flexible flat circuit body. It is a typical side view of the principal part which shows a state without buckling at the time of the further bending deformation of a flexible flat circuit body. It is a typical side view of the principal part which shows a state without buckling at the time of bidirectional bending deformation of a flexible flat circuit body. It is sectional drawing which shows 2nd Embodiment of a flexible flat circuit body. It is sectional drawing which shows 3rd Embodiment of a flexible flat circuit body. It is sectional drawing which shows 4th Embodiment of a flexible flat circuit body. It is a perspective view which shows the structure of the conventional flexible flat circuit body. It is a side view of the principal part which shows the bending deformation of a flexible flat circuit body. It is a typical side view of the important section showing the state where buckling had occurred at the time of return to the original shape of a flexible flat circuit body. It is a typical side view of the principal part which shows the state which buckled produced at the time of the further bending deformation of a flexible flat circuit body. It is a perspective view which shows the structure of the conventional flat cable.

  Hereinafter, embodiments of a flexible flat circuit body according to the present invention will be described in detail with reference to the drawings.

<First Embodiment>
The flexible flat circuit body 1 of the first embodiment includes a plurality of flat conductors 3 and an insulating coating 7 that collectively covers the plurality of flat conductors 3. The insulating coating 7 collectively covers a plurality of flat conductors 3 and elastic conductors 5 having predetermined rigidity and elasticity that do not cause buckling in a state of being arranged on a plane parallel to each other at predetermined intervals. .

  The flexible flat circuit body 1 in this embodiment is provided with the five conductors 3 and the two elastic conductors 5, as shown in FIG.1 and FIG.2. The five conductors 3 and the two elastic conductors 5 are arranged at substantially equal intervals in the width direction W of the flexible flat circuit body 1. In this embodiment, the elastic conductors are provided on both sides of the five conductors 3. 5 are arranged one by one.

  The conductor 3 and the elastic conductor 5 are provided at the center in the thickness direction of the flexible flat circuit body 1. Assuming that the thickness of the flexible flat circuit body 1 is t, as shown in FIG. 2, the five conductors 3 and the two elastic conductors 5 are positioned at a position of 1/2 · t, and the periphery is insulated. 7. The five conductors 3 and the two elastic conductors 5 are positioned at a position of ½ · t over the entire area in the length direction L of the flexible flat circuit body 1 and are individually separated by the insulating coating 7. Is insulated.

  The flexible flat circuit body 1 is obtained by extrusion-molding five conductors 3 and two elastic conductors 5, and the insulating coating 7 is PP (polypropylene), PVC (polyvinyl chloride), PU (polyurethane). Etc. are suitable.

  For the five conductors 3, for example, a copper material or the like is suitable, and for the two elastic conductors 5, for example, stainless steel or phosphor bronze having elasticity and conductivity is suitable.

  When the flexible flat circuit body 1 is applied as a wire harness that bridges between a vehicle body and a sliding door (not shown), one end of the flexible flat circuit body 1 is indicated by an arrow C in FIG. In addition, the flat plate shape indicated by the imaginary line may be deformed to the curved shape indicated by the solid line.

  On the other hand, as the slide door moves, one end of the flexible flat circuit body 1 may be deformed from a curved shape indicated by an imaginary line to a flat plate shape indicated by a solid line as indicated by an arrow D in FIG.

  Thus, with the movement of the slide door, the flexible flat circuit body 1 repeats bending deformation as shown in FIGS.

  However, in the flexible flat circuit body 1 of this embodiment, due to the high rigidity and elastic action of the two elastic conductors 5, buckling does not appear at the bending deformation position indicated by the arrow E in FIG. For this reason, early disconnection can be prevented for both the two elastic conductors 5 and the five conductors 3.

  Note that, as described with reference to FIG. 2, the flexible flat circuit body 1 has the five conductors 3 and the two elastic conductors 5 positioned at a position that is ½ of the thickness t. . Therefore, the flexible flat circuit body 1 is bent in either the direction indicated by the arrow C from the flat shape indicated by the imaginary line in FIG. 6 or the case where the flexible flat circuit body 1 is bent in the direction indicated by the arrow Ca. The body 1 has the same rigidity and elasticity, and the bending radius is increased.

  As a result, no buckling appears at the bending deformation positions indicated by arrows E and Ea in FIG. Therefore, the flexible flat circuit body 1 can be applied not only to one in the thickness direction but also to a bending deformation in both directions, and can be used for multiple purposes.

  In the flexible flat circuit body 1 according to the present embodiment, the two elastic conductors 5 are not laminated on the five conductors 3 but are arranged side by side in the width W direction. Therefore, the flexible flat circuit body 1 can be thinned and can be routed in a narrow gap or the like. Furthermore, a plurality of flexible flat circuit bodies 1 can be laminated and routed, and the mounting density of the wire harness can be improved.

Second Embodiment
As shown in FIG. 7, the flexible flat circuit body 21 in this embodiment has five elastic conductors 5 arranged in the width W direction as conductors. Further, the five elastic conductors 5 are arranged in a line in the width direction at a position of ½ of the thickness t as in the first embodiment.

  Therefore, when the flexible flat circuit body 21 is bent and deformed as shown in FIGS. 3 to 6, buckling does not appear in the same manner as described above, and early disconnection of the five elastic conductors 5 can be prevented.

  In addition, since no other conductor is laminated on the five elastic conductors 5, the flexible flat circuit body 1 can be thinned, and the same effect as in the first embodiment can be obtained.

<Third Embodiment>
In the flexible flat circuit body 31 in the present embodiment, the conductors 3 and the elastic conductors 5 are alternately arranged in the width W direction as shown in FIG. The conductors 3 and the elastic conductors 5 are arranged in a line in the width direction at the position of ½ of the thickness t as in the first embodiment.

  Therefore, when the flexible circuit 21 is bent and deformed as shown in FIGS. 3 to 6, buckling does not appear in the same manner as described above, and early disconnection of the conductor 3 as well as the elastic conductor 5 can be prevented.

  In addition, since no other conductor is laminated on the conductor 3 and the elastic conductor 5, the flexible flat circuit body 31 can be thinned, and the same effect as in the first embodiment can be obtained.

<Fourth embodiment>
As shown in FIG. 9, the flexible flat circuit body 41 in the present embodiment has a wide elastic conductor 5a positioned at the center in the width W direction, and a narrow conductor 3a disposed on both sides thereof. In addition, another conductor 3 is disposed on both outer sides of each conductor 3a.

  In addition, the conductors 3 and 3a and the elastic conductor 5a are arranged in a line in the width direction at a position of ½ of the thickness t as in the first embodiment.

  Therefore, when the flexible circuit 41 is bent and deformed as shown in FIGS. 3 to 6, buckling does not appear in the same manner as described above, and early disconnection of the conductors 3 and 3a as well as the elastic conductor 5a can be prevented.

  Further, since no other conductor is laminated on the conductors 3 and 3a and the elastic conductor 5a, the flexible flat circuit body 41 can be thinned, and the same effect as in the first embodiment can be obtained.

  Furthermore, since the elastic conductor 5a is formed wide, the cross-sectional area becomes large, and the current amount of the elastic conductor 5a can be increased.

  Further, since the elastic conductor 5a is formed wide, the rigidity is high even though only one is provided, and the bending deformation of the flexible flat circuit body 41 can be stabilized.

  Further, since the conductor 3a is formed to be narrow, the dimension in the width direction can be reduced, and even if the elastic conductor 5a is widened, it is not necessary to increase the width of the flexible flat circuit body 41.

  The present invention is not limited to the above-described embodiments, and can be appropriately modified and improved. In addition, the material, shape, dimension, numerical value, form, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.

  For example, the number of conductors 3 and elastic conductors 5 provided is not limited to the number shown in each of the above embodiments, and can be changed as necessary.

1, 21, 31, 41 Flexible flat circuit body 3, 3a Conductor 5, 5a Elastic conductor 7 Insulation coating C, D Bending direction E Buckling t Flat cable thickness L Flat cable length W Flat cable width

Claims (5)

A flexible flat circuit body comprising a plurality of flat conductors and an insulating coating that collectively covers the plurality of flat conductors in parallel with each other at a predetermined interval on a plane,
The conductor is disposed at the center in the thickness direction of the flexible flat circuit body;
A flexible flat circuit body, wherein at least one of the conductors is an elastic conductor having a predetermined rigidity and elasticity that does not cause buckling.   2. The flexible flat circuit body according to claim 1, wherein the elastic conductor is disposed on both sides in the width direction of the flexible flat circuit body, and the conductor is disposed between the elastic conductors.   The flexible flat circuit body according to claim 1, wherein the conductor and the elastic conductor are alternately arranged along a width direction of the flexible flat circuit body.   4. The flexible flat circuit body according to claim 1, wherein the elastic conductor is disposed at a central portion in the width direction of the flexible flat circuit body, and the conductor is disposed on both sides thereof. 5.   The flexible flat circuit body according to claim 4, wherein a width of the elastic conductor is set larger than a width of the conductor.

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