JP2013027265A - Flat cable assembly - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flat cable assembly capable of effectively preventing disconnection.SOLUTION: A flat cable assembly 1 according to the present invention has: plural electric wires 10 aligned in parallel to each other; a pair of connectors 20A, 20B coupled to both ends of the electric wires 10; a first fixing part 31 for fixing a connector 20A and a portion AR1 extending from a connector 20A to a prescribed distance away from the connector 20A toward the other connector 20B side in the plural electric wires 10, and a second fixing part 32 for fixing a portion AR2 from a position away from the first fixing part 31 toward the other connector 20B by a predetermined distance to the other connector 20B in the plural electric wires 10.

Description

  The present invention relates to a flat cable assembly that can effectively prevent disconnection.

  Conventionally, a printed circuit board called FPC (Flexible Printed Circuits) is known. This FPC generally has a structure in which a film-like insulator and a conductor layer are laminated and has flexibility. For this reason, the FPC is often used at a location where the wiring is bent. For example, an FPC is used as a signal line that electrically connects a main body portion and a slide portion that slides away from or toward the main body portion.

  On the other hand, a flat cable assembly in which a plurality of micro coaxial cables are arranged in parallel to each other is also known. This flat cable assembly has advantages such as having better shielding characteristics than FPC. For this reason, there is a demand for using a flat cable assembly instead of an FPC.

  As such a flat cable assembly, there has been proposed one in which a plurality of micro coaxial cables are inserted into a flexible tube to prevent the respective micro coaxial cables from being scattered (see Patent Document 1). .

JP 2010-192318 A

  However, in the case of the flat cable assembly proposed in Patent Document 1, the flexibility of the entire flat cable assembly is lowered by the amount covered with the tube. For this reason, if the flat cable assembly is bent even once, the bent portion is bent and a stress is easily concentrated. Therefore, in the case of the flat cable assembly disclosed in Patent Document 1, the tendency to break is increased.

  On the other hand, when the tube is omitted, since both ends of the micro coaxial cable are only connected to the connector, in the bent state, the micro coaxial cables are scattered, which may cause disconnection or the like.

  Then, an object of this invention is to provide the flat cable assembly which can suppress the dispersion | distribution of a cable and can prevent a disconnection effectively.

  In order to solve the above problems, a flat cable assembly of the present invention includes a plurality of electric wires arranged in parallel to each other, a pair of connectors connected to both ends of the plurality of electric wires, and the plurality of electric wires. A first fixing portion that fixes a portion extending from the one connector and a position spaced from the connector to the other connector side by a predetermined distance; and from the first fixing portion to the other of the plurality of electric wires. It is characterized by comprising a second fixing portion for fixing a position extending a predetermined distance to the connector side and the other connector.

  According to such a flat cable assembly, scattering of each electric wire can be suppressed by the first fixing portion and the second fixing portion. Furthermore, in the part pinched | interposed into the 1st fixing | fixed part and 2nd fixing | fixed part of each electric wire, flexibility can be hold | maintained high compared with a 1st fixing | fixed part and a 2nd fixing | fixed part. When such a flat cable assembly is bent, the portion sandwiched between the first fixing portion and the second fixing portion is bent so that the flexibility is higher than that of the first fixing portion and the second fixing portion. For this reason, it is difficult to cause bending wrinkles when bent, and it is possible to avoid a state where stress tends to concentrate. In this way, a flat cable assembly that can suppress cable scattering and effectively prevent disconnection is provided.

  Moreover, it is preferable to further include at least one auxiliary fixing portion that is provided between the first fixing portion and the second fixing portion and fixes the plurality of electric wires.

  According to such a flat cable assembly, even when it is necessary to ensure a large portion between the first fixing portion and the second fixing portion, the electric wire dispersion at the portion is suppressed by the auxiliary fixing portion. The Therefore, disconnection can be effectively prevented regardless of the size of the portion sandwiched between the first fixing portion and the second fixing portion.

  Also, between the auxiliary fixing portion and the first fixing portion, between the auxiliary fixing portion and the second fixing portion, and between the auxiliary fixing portions when the auxiliary fixing portion is 2 or more. The distance along the longitudinal direction of the electric wire is preferably equal to or greater than the width of the auxiliary fixing portion in the longitudinal direction of the electric wire.

  According to such a flat cable assembly, contact between the auxiliary fixing portions adjacent to each other can be avoided even when the portion sandwiched between the first fixing portion and the second fixing portion is in a bent state. Therefore, even if the part bent in the part pinched by the 1st fixed part and the 2nd fixed part moves, the movement can be made smooth.

  Also, between the auxiliary fixing portion and the first fixing portion, between the auxiliary fixing portion and the second fixing portion, and between the auxiliary fixing portions when the auxiliary fixing portion is 2 or more. It is preferable that the distance along the longitudinal direction of the electric wire is not less than a radius of curvature allowed for the electric wire to withstand bending and less than a value obtained by doubling the radius of curvature.

  According to such a flat cable assembly, since the distance between the parts is equal to or greater than the radius of curvature, the electric wire between the parts can be bent. Therefore, the portion sandwiched between the first fixing part and the second fixing part is Can be bent smoothly. In addition, when the distance between the first fixing portion and the second fixing portion is less than a value obtained by doubling the radius of curvature, the portion sandwiched between the first fixing portion and the second fixing portion is bent as much as possible to withstand bending. However, it can suppress that the stress which arises in an electric wire from the difference of the tensile force of a bending outer side, and the compression force of a bending inner side is added to an auxiliary | assistant fixing | fixed part excessively. Therefore, it is possible to avoid the bending of the auxiliary fixing portion.

  As described above, according to the present invention, there is provided a flat cable assembly that can suppress cable scattering and effectively prevent disconnection.

It is a figure which shows the flat cable assembly which concerns on embodiment of this invention. It is a figure which shows the cross section perpendicular | vertical to a longitudinal direction about one micro coaxial cable in FIG. It is a figure which shows a mode when the flat cable assembly of FIG. 1 is attached in the state bent in the U shape. It is a figure which shows a mode when the flat cable assembly of FIG. 1 is attached in the state bent in S shape.

  Hereinafter, preferred embodiments of a flat cable assembly according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a view showing a flat cable assembly according to an embodiment of the present invention. As shown in FIG. 1, the flat cable assembly 1 includes a plurality of micro coaxial cables 10, a pair of connectors 20A and 20B, and a fixing portion 30 as main components.

  The plurality of micro coaxial cables 10 have the same structure, and are arranged in parallel with each other. FIG. 2 is a view showing a cross section perpendicular to the longitudinal direction of one micro coaxial cable in FIG. As shown in FIG. 2, the micro coaxial cable 10 includes an inner conductor 11, an insulating member 12 that covers the outer peripheral surface of the inner conductor 11, an outer conductor 13 that covers the outer peripheral surface of the insulating member 12, and the outer conductor 13. It is set as the structure which has the jacket 14 to coat | cover.

  The inner conductor 11 is a core wire of the micro coaxial cable 10 and is formed as a stranded wire of a plurality of conductive wires, for example. The insulating member 12 is formed of an insulating resin, and the external conductor 13 is formed of, for example, a metal braid in which a plurality of conductive wires are knitted. The jacket 14 is formed of an insulating coating layer such as a thermoplastic resin.

  The diameter of the micro coaxial cable 10 including such components is generally in the range of 200 μm to 400 μm. In addition, although the cross-sectional shape of each component (the internal conductor 11, the insulating member 12, the external conductor 13, and the jacket 14) of the micro coaxial cable 10 is each circular, the cross-sectional shape of all or some of these components May be other than a circular shape such as an elliptical shape or a rectangular shape.

  As shown in FIG. 1, one connector 20 </ b> A is connected to one end of the plurality of micro coaxial cables 10, and the other connector 20 </ b> B is connected to the other end of the plurality of micro coaxial cables 10. Each of these connectors 20 </ b> A and 20 </ b> B includes a housing 21 and a ground conductor 22 fixed to the housing 21. The casing 21 is provided with a plurality of terminals (not shown), and the terminals of the inner conductor 11 in each micro coaxial cable 10 are connected to these terminals. A ground bar (not shown) is connected to the ground conductor 22, and a part of the outer conductor 13 in each micro coaxial cable 10 is connected to the ground bar.

  The fixing part 30 fixes a plurality of micro coaxial cables 10 and includes a first fixing part 31, a second fixing part 32, and a plurality of auxiliary fixing parts 33.

  The 1st fixing | fixed part 31 is fixing | fixing site | part AR1 ranging over one connector 20A among the several micro coaxial cables 10, and the position spaced apart from the connector 20A to the other connector 20B side. The 2nd fixing | fixed part 32 is fixing | fixed site | part AR2 over the position which left | separated predetermined distance from the 1st fixing | fixed part 31 to the other connector 20B side among the several micro coaxial cables 10, and the connector 20B.

  The first fixing portion 31 and the second fixing portion 32 are formed by bonding a pair of rectangular adhesive tapes FM1 and FM2, respectively.

  These adhesive tapes FM1 and FM2 are not particularly limited. For example, the adhesive tape is applied to one surface of a resin film, or the adhesive is applied to one surface of a resin film. The thing provided with the metal layer is mentioned.

  As shown in FIG. 1, each auxiliary fixing portion 33 has the same shape and the same size, and a part AR <b> 3 sandwiched between the first fixing portion 31 and the second fixing portion 32 in the plurality of micro coaxial cables 10. It is provided at predetermined intervals. This part AR3 is a part to be bent. Hereinafter, this part AR3 is referred to as a bent part AR3.

  Similar to the first fixing portion 31 and the second fixing portion 32, the auxiliary fixing portion 33 is formed by bonding a pair of rectangular adhesive tapes.

  The width W of the auxiliary fixing portion 33 is set to be equal to or less than the distance D between the auxiliary fixing portions 33, and this distance D is equal to or larger than the radius of curvature allowed for the micro coaxial cable 10 to withstand bending and has a radius of curvature. The value is less than the doubled value. Specifically, the distance D between the auxiliary fixing portions 33 is 5 mm or more and less than 10 mm in the AWG standard 42, 3.5 mm or more and less than 7 mm in 44, and 2.5 mm or more and less than 5 mm in 46.

  Note that the distance between the auxiliary fixing portion 33 and the first fixing portion 31 and between the auxiliary fixing portion 33 and the second fixing portion 32 is equal to or greater than the radius of curvature and less than a value obtained by doubling the radius of curvature. If so, it may be the same as or different from the distance D between the auxiliary fixing portions 33. Further, the width W1 of the first fixed portion 31 and the width W2 of the second fixed portion 32 may be the same or different, and the distance FD between the width W1 or the width W2 and the bent portion AR3 is the same. It may or may not be.

  FIG. 3 is a view showing a state where the flat cable assembly of FIG. 1 is attached in a state bent in a U-shape. As shown in FIG. 3, the plate-like main body 50 and the dependent portion 60 are arranged in a state of facing each other with a predetermined distance therebetween. The dependent portion 60 is slidable in the direction DTa away from the main body 50 or in the direction DTb approaching the main body 50 along the surface 50A facing the main body 50.

  Further, between the main body 50 and the subordinate portion 60, the bent portion AR3 of the flat cable assembly 1 is bent in a U shape in a direction orthogonal to the surface 60A of the subordinate portion 60 facing the main body 50. Arranged in a state. A connector 20A on one end side of the flat cable assembly 1 is connected to a connector (not shown) of the main body 50, and a connector 20B on the other end side is connected to a connector (not shown) of the dependent portion 60.

  The bending width FW of the bending portion AR3 in the flat cable assembly 1 is not less than the sum of the value obtained by doubling the distance D between the auxiliary fixing portions 33 and the width W of the auxiliary fixing portions 33. The distance FD of the bent part AR3 is equal to or longer than the sliding length (movement amount) of the dependent part 60.

  In the flat cable assembly 1 in such a connected state, when the dependent portion 60 slides, the bent portion AR3 also moves according to the slide.

  Specifically, when the dependent portion 60 slides in the direction DTa away from the main body portion 50, the micro coaxial cable 10 on the connector 20A side of the bent portion AR3 is moved from the bent state to the main body portion 50 by an amount corresponding to the sliding amount. It shifts to a state parallel to one surface 50A. On the other hand, the micro coaxial cable 10 on the connector 20B side of the bent portion AR3 shifts from the state parallel to the one surface 60A of the dependent portion 60 to the bent state by an amount corresponding to the sliding amount.

  On the other hand, when the dependent portion 60 slides in the direction DTb approaching from the main body portion 50, the micro coaxial cable 10 on the connector 20B side of the bent portion AR3 is moved from the bent state to the dependent portion 60 by an amount corresponding to the sliding amount. It shifts to a state parallel to one surface 60A. On the other hand, the micro coaxial cable 10 on the connector 20A side of the bent part AR3 shifts from a state parallel to the one surface 50A of the main body 50 to a bent state by an amount corresponding to the sliding amount.

  And with such a transition, the part of the micro coaxial cable 10 located at the bending vertex TP of the bending part AR3 changes.

  As described above, the bending width FW of the bending portion AR3 is equal to or greater than the sum of the value obtained by doubling the distance D between the auxiliary fixing portions 33 and the width W of the auxiliary fixing portion 33. For this reason, when the micro coaxial cable 10 of the bent part AR3 shifts from the bent state to a state parallel to the one surface 50A of the main body 50 or the one surface 60A of the dependent part 60, the one surface 50A or one surface 60A and the bent part The contact with the corner | angular of the auxiliary | assistant fixing | fixed part 33 interposed in AR3 is reduced significantly. Therefore, the flat cable assembly 1 can smoothly move the bent portion AR3 between the main body portion 50 and the dependent portion 60.

  Further, since the distance FD of the bent portion AR3 is equal to or longer than the sliding length (movement amount) of the dependent portion 60, the first transition point TP of the bent portion AR3 is moved to the first position with the state transition of the bent portion AR3. It is avoided in advance that the fixing part 31 or the second fixing part 32 is positioned. Therefore, the flat cable assembly 1 can avoid the concentration of stress caused by the bending wrinkles with respect to the first fixing portion 31 or the second fixing portion 32 in advance.

  As described above, in the flat cable assembly 1 of the present embodiment, among the plurality of micro coaxial cables 10 arranged in parallel with each other, the connector 20A is separated from the connector 20A by the predetermined distance from the connector 20A to the other connector 20B side. A portion AR <b> 1 extending over the position is fixed by the first fixing portion 31. Further, a portion AR2 extending from the first fixing portion 31 to the connector 20B side at a predetermined distance and the connector 20B is fixed by the second fixing portion 32.

  In such a flat cable assembly 1, in the bent portion AR <b> 3 sandwiched between the first fixing portion 31 and the second fixing portion 32, dispersion of the micro coaxial cables 10 is suppressed by the first fixing portion 31 and the second fixing portion 32. However, the bending portion AR3 can maintain higher flexibility than the first fixing portion 31 and the second fixing portion 32. Therefore, when the flat cable assembly 1 is bent, a portion sandwiched between the first fixing portion 31 and the second fixing portion 32 is bent, but it is difficult for bending wrinkles to occur, and a state where stress is easily concentrated can be avoided. .

  Further, in the flat cable assembly 1 of the present embodiment, a plurality of auxiliary fixing portions 33 that fix the micro coaxial cables 10 to each other are provided between the first fixing portion 31 and the second fixing portion 32. For this reason, even if it is a case where bending part AR3 must be ensured largely, the dispersion | distribution of the micro coaxial cable 10 in the bending part AR3 is suppressed by the auxiliary | assistant fixing | fixed part 33. FIG. Therefore, disconnection can be effectively prevented regardless of the size of the bent portion AR3.

  This is particularly useful when the members to be connected to the flat cable assembly 1 are relatively moved, such as the main body 50 and the slave 60 described above. In such a case, since the bending position in the micro coaxial cable 10 changes with relative movement between the members, it is necessary to ensure a large distance FD of the bending portion AR3 by an amount corresponding to the movement amount. Because.

  Further, in the flat cable assembly 1 of the present embodiment, the width W of the auxiliary fixing portion 33 is set to be equal to or less than the distance D between the auxiliary fixing portions 33. For this reason, even if the bending part AR3 is in the bent state, the contact between the auxiliary fixing parts 33 adjacent to each other is greatly reduced. Therefore, the flat cable assembly 1 can smoothly move the bent portion AR3 even if the bent portion AR3 moves.

  Furthermore, in the flat cable assembly 1 of the present embodiment, the distance D between the auxiliary fixing portions 33 is equal to or larger than the radius of curvature allowed for the micro coaxial cable 10 to withstand bending, and the radius of curvature is doubled. It is considered to be less than the value.

  By setting the distance D between the auxiliary fixing portions 33 to be equal to or greater than the radius of curvature, the micro coaxial cable 10 between the auxiliary fixing portions 33 in the bending portion AR3 can be bent. In addition, since the distance D between the auxiliary fixing portions 33 is less than the value obtained by doubling the radius of curvature, the bending portion AR3 can be bent even if it is bent to the maximum. It can suppress that the stress which arises in an electric wire from the difference of an outer tensile force and the compression force of a bending inner side is added to the auxiliary | assistant fixing | fixed part 33 excessively. Therefore, it is possible to prevent the auxiliary fixing portion 33 from being bent.

  Although the preferred embodiments of the flat cable assembly according to the present invention have been described above, the present invention is not limited to these embodiments.

  For example, in the above-described embodiment, the micro coaxial cable 10 is applied as the electric wire. However, for example, an insulated wire in which a conductive wire is covered with an insulating layer can be applied to the electric wire.

  Moreover, in the above-mentioned embodiment, the 1st fixing | fixed part 31, the 2nd fixing | fixed part 32, and each auxiliary | assistant fixing | fixed part 33 were formed by bonding together a pair of adhesive tapes FM1 and FM2. However, the formation method of the 1st fixing | fixed part 31, the 2nd fixing | fixed part 32, and each auxiliary | assistant fixing | fixed part 33 is not limited to this embodiment. For example, a technique of molding the first fixing part 31, the second fixing part 32, or each auxiliary fixing part 33 with a resin, or a technique of hardening by applying a hot melt and then cooling can be applied. In addition, the formation method of the 1st fixing | fixed part 31, the 2nd fixing | fixed part 32, and each auxiliary | assistant fixing | fixed part 33 may each differ.

  Further, in the above-described embodiment, the entire one side surface of the micro coaxial cable 10 and the entire other end surface of the first fixing portion 31 and the second fixing portion 32 are fixed, but a part thereof may be fixed. For example, the fine coaxial cables 10 may be fixed in a striped pattern along the longitudinal direction of the fine coaxial cable 10. Moreover, it is possible to fix one side surface and the whole other end surface in mesh shape. In this case, the flexibility can be improved as compared with the case where the entire side surface is fixed while preventing the dispersion of the respective micro coaxial cables 10.

  Moreover, in the above-mentioned embodiment, although the four auxiliary fixing parts 33 provided in bending | flexion site | part AR3 were five, five or more may be sufficient and three or less may be sufficient. The auxiliary fixing part 33 may be omitted. However, when the auxiliary fixing part 33 is omitted, the tendency that the fine coaxial cables 10 are scattered increases as the distance FD of the bent part AR3 increases. Therefore, regardless of the distance FD of the bent portion AR3, it is desirable to have the auxiliary fixing portion 33 from the viewpoint of preventing scattering of the micro coaxial cable 10.

  In the above-described embodiment, the auxiliary fixing portion 33 is provided at every predetermined interval with respect to the bent portion AR3. However, an arbitrary interval may be used. In addition, from the viewpoint of avoiding the concentration of stress due to the bending wrinkles of the auxiliary fixing portion 33, the radius D of the allowable distance that the micro coaxial cable 10 can withstand bending is set to the distance D between the auxiliary fixing portions 33. It is desirable to satisfy the condition of less than the doubled value. In addition, from the viewpoint of smoothly moving the bending portion AR3, it is desirable to satisfy the condition that the distance D between the auxiliary fixing portions 33 is equal to or larger than the allowable radius of curvature that the micro coaxial cable 10 can withstand bending. .

  Moreover, in the above-mentioned embodiment, the shape of the auxiliary | assistant fixing | fixed part 33 was made into the rectangular shape. However, the shape of the auxiliary fixing portion 33 is not limited to this embodiment. For example, various shapes such as an elliptical shape, a mesh shape, or a linear shape are applicable. However, from the viewpoint of smoothly moving the bent portion AR3, it is preferable that the left and right sides are symmetrical with respect to an imaginary line in a direction orthogonal to the longitudinal direction of the micro coaxial cable 10.

  Moreover, in the above-mentioned embodiment, although the auxiliary | assistant fixing | fixed part 33 was provided along the direction orthogonal to the longitudinal direction of the micro coaxial cable 10, you may provide diagonally with respect to the said longitudinal direction.

  Moreover, in the above-mentioned embodiment, the flat cable assembly 1 was arrange | positioned in the state bent in U shape between the main-body part 50 and the dependent part 60. FIG. However, the bent state is not limited to the U-shape. For example, as shown in FIG. 4, it may be bent into an S shape, or may be bent into a shape other than a U shape or an S shape. In addition, from the viewpoint of smoothly moving the bent portion AR3 between the main body portion 50 and the dependent portion 60, the bending width FW is a value obtained by doubling the distance D between the auxiliary fixing portions 33 and the width of the auxiliary fixing portion 33. It is desirable that the value be equal to or greater than the sum of W. Further, from the viewpoint of avoiding stress concentration due to the bending wrinkles with respect to the first fixing portion 31 or the second fixing portion 32, the distance FD of the bent portion AR3 is the length (movement amount) by which the dependent portion 60 slides. It is desirable to satisfy both or one of the above.

  The present invention can be used to electrically connect components that are relatively movable in a direction away from each other or a direction in which they approach each other.

DESCRIPTION OF SYMBOLS 1 ... Flat cable assembly 10 ... Micro coaxial cable 11 ... Inner conductor 12 ... Insulating member 13 ... Outer conductor 14 ... Jacket 20A, 20B ... Connector 21 ... Housing 22 ... Grounding conductor 30 ... Fixed part 31 ... First fixed part 32 ... Second fixed part 33 ... Auxiliary fixed part 50 ... Body part 60 ... Subordinate part AR3 ... Bending part FM1, FM2 ... Adhesive tape

Claims (4)

A plurality of electric wires arranged in parallel to each other;
A pair of connectors coupled to both ends of the plurality of wires;
Among the plurality of electric wires, a first fixing portion that fixes one of the connectors and a portion extending from the connector to the other connector side at a predetermined distance;
Of the plurality of electric wires, a flat having a position spaced a predetermined distance from the first fixing portion to the other connector side, and a second fixing portion for fixing a portion extending to the other connector. Cable assembly. The flat cable assembly according to claim 1, further comprising at least one auxiliary fixing portion provided between the first fixing portion and the second fixing portion and fixing the plurality of electric wires. . The width in the longitudinal direction of the electric wire in the auxiliary fixing part is between the auxiliary fixing part and the first fixing part, between the auxiliary fixing part and the second fixing part, and 2 for the auxiliary fixing part. 3. The flat cable assembly according to claim 2, further comprising: a distance along the longitudinal direction of the electric wire between the auxiliary fixing portions in the above case. The electric wire between the auxiliary fixing portion and the first fixing portion, between the auxiliary fixing portion and the second fixing portion, and between the auxiliary fixing portions when the auxiliary fixing portion is two or more. 3. The flat according to claim 2, wherein the distance along the longitudinal direction of the flat wire is not less than a radius of curvature allowed for the electric wire to withstand bending and less than a value obtained by doubling the radius of curvature. Cable assembly.

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