JP2013143276A - Small-diameter coaxial cable harness with connection member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small-diameter coaxial cable harness with a connection member which allows for high density wiring.SOLUTION: A plurality of small-diameter coaxial cables 12 each having a center conductor 21 and an outer conductor 23 exposed at an end are arranged in parallel, and a connection member 13 which can be inserted into a connector and withdrawn therefrom is connected to the end of the small-diameter coaxial cables 12. In such a small-diameter coaxial cable harness 11 with a connection member, the connection member 13 consists of a metal plate 31 and a flexible printed circuit board 32. A conductor circuit 42 is provided on one surface of the flexible printed circuit board 32, and the other surface of the flexible printed circuit board 32 is pasted to the metal plate 31. The outer conductor 23 of the small-diameter coaxial cables 12 is connected with the metal plate 31, the center conductor 21 of the small-diameter coaxial cables 12 is connected with the conductor circuit 42, and a part of the conductor circuit 42 is a contact 42b conducting with a connector 61.

Description

  The present invention relates to a small-diameter coaxial cable harness with a connecting member used for wiring of electronic equipment and the like.

  A flat cable harness made of a flexible printed wiring board (FPC) or a flexible flat cable (FFC) is used as a harness used for wiring of an electronic device or the like. In this flat cable harness, the thickness of the terminal portion is standardized to some extent by attaching a reinforcing plate, and the conductor is brought into conductive contact with the terminal on the connector side by directly connecting the terminal portion to a connector such as a substrate. In such a flat cable harness, a wiring-side connector is not required at a terminal portion connected to the connector.

  As wiring for an electronic device or the like, not only a flat cable but also a thin coaxial cable having a conductor having a circular cross section is used. When a plurality of such small-diameter coaxial cables are collectively used as a harness, the conductor of each small-diameter coaxial cable cannot be directly inserted into the connector on the device side. Therefore, there is a form in which a printed circuit board serving as a relay board having a terminal structure equivalent to the terminal part of the flat cable harness is prepared, a small coaxial cable is connected to the printed board by soldering, and the printed circuit board is inserted into the connector. It is known (see, for example, Patent Document 1).

JP 2010-251554 A

  In the structure using the above-mentioned printed circuit board relay board, a fitting part to be fitted to the connector and a mounting part for mounting the small-diameter coaxial cable so as not to overlap the fitting part are necessary. The dimension in the axial direction becomes large. In addition, the thickness of the printed circuit board itself is large, and the overall thickness dimension is increased by mounting the thin coaxial cable on the surface of the relay board. For this reason, it has been difficult to use in electronic devices that require high-density mounting.

  The objective of this invention is providing the small diameter coaxial cable harness with a connection member in which high-density wiring is possible.

The thin coaxial cable harness with a connecting member of the present invention that can solve the above-mentioned problems is a connection in which a plurality of thin coaxial cables with the central conductor and the external conductor exposed at the end are arranged in parallel and can be inserted into and removed from the connector. A member is a thin coaxial cable harness with a connecting member connected to an end of the thin coaxial cable,
The connection member is composed of a metal plate and a flexible printed circuit board,
Conductor circuits are provided on one surface of the flexible printed circuit board,
The other surface of the flexible printed circuit board is attached to the metal plate,
The outer conductor of the thin coaxial cable is connected to the metal plate;
The central conductor of the small coaxial cable is connected to the conductor circuit;
A part of the conductor circuit is a contact that is electrically connected to the connector.

In the thin coaxial cable harness with a connecting member of the present invention, a part of the flexible printed circuit board is folded back to the metal plate side, and the other surface of the flexible printed circuit board is attached to both surfaces of the metal plate,
It is preferable that the conductor circuit folded back to the metal plate side is the contact.

  In the thin coaxial cable harness with a connecting member of the present invention, it is preferable that a resin film covering the center conductor is attached to a surface of the flexible printed circuit board on which the center conductor is connected to the conductor circuit.

  In the thin coaxial cable harness with a connecting member of the present invention, it is preferable that the resin film has a plurality of grooves, and the central conductor connected to the conductor circuit is accommodated in the grooves.

  According to the present invention, the central conductor of the small-diameter coaxial cable is connected to the conductor circuit of the flexible printed circuit board, and a part of this conductor circuit is provided as a contact point that is electrically connected to the connector and is connected to the connector. . Thereby, the dimension of the axial direction of the thin coaxial cable in the connection member can be significantly reduced, and it can be suitably used as the wiring of an electronic device that requires high-density mounting. In addition, since the connecting member has a structure in which a flexible printed circuit board is attached to a metal plate, it can be made thinner than the case of using a hard printed circuit board, and can correspond to an existing connector for a flat cable harness. it can.

It is a figure which shows the thin coaxial cable harness with a connection member which concerns on one Embodiment of this invention, Comprising: (a) is a top view, (b) is a front view, (c) is a side view. It is sectional drawing which expands and shows a part of connection member of FIG. It is the top view which looked at a part of connecting member of Drawing 1 from the back side. It is a side view which shows the state by which the small diameter coaxial cable harness with a connection member of FIG. 1 was connected to the connector.

Hereinafter, an example of an embodiment of a thin coaxial cable harness with a connecting member according to the present invention will be described with reference to the drawings.
As shown in FIG. 1, a thin coaxial cable harness with a connecting member (hereinafter referred to as a thin coaxial harness) 11 according to the present embodiment includes a plurality of thin coaxial cables 12 and these thin coaxial cables 12. And a connecting member 13 provided at the end portion of the head.

  The small-diameter coaxial cable 12 has a center conductor 21, an inner insulator 22, an outer conductor 23, and a jacket 24 from the center toward the outside in a radial cross section orthogonal to the center axis. These thin coaxial cables 12 are subjected to terminal treatment at their respective ends, and the outer conductor 23, the inner insulator 22 and the center conductor 21 are exposed stepwise to a predetermined length. Further, the thin coaxial harness 11 may include a thin insulated cable having no external conductor in addition to the plural thin coaxial cables 12.

  The small-diameter coaxial cable 12 referred to in the present invention is a coaxial cable that is thinner than the AWG 40 according to the AWG (American Wire Gauge) standard, and its outer diameter is about 0.2 mm. It is desirable to use a fine coaxial cable thinner than the AWG44. These small-diameter coaxial cables 12 are arranged in a plane with a predetermined parallel pitch P of, for example, about 0.3 mm.

  The connecting member 13 includes a metal plate 31 and a flexible printed board 32. The metal plate 31 is formed by pressing copper or a copper alloy. One surface of the flexible printed circuit board 32 is a mounting surface 33, and the small-diameter coaxial cable 12 is mounted in parallel on the mounting surface 33. In this connection member 13, the portion ahead of the small-diameter coaxial cable 12 mounted on the mounting surface 33 is the insertion side to the connector.

  In the metal plate 31, a step 35 is formed at an intermediate portion in the axial direction of the thin coaxial cable 12 along the arrangement direction of the thin coaxial cable 12. Then, with the step 35 as a boundary, the insertion side is a central conductor mounting portion 36, and the opposite side to the insertion side is an external conductor mounting portion 37. The center conductor mounting portion 36 is arranged one step higher than the outer conductor mounting portion 37 by the step 35 toward the center conductor 21 side.

Further, a ground terminal portion 38 is formed on the metal plate 31 on the side opposite to the insertion side. The ground terminal portion 38 is formed by bending a part of the metal plate 31 extending from the rear end side to the side opposite to the thin coaxial cable 12. The ground terminal portion 38 is further bent at the end in the insertion direction to the metal plate 31 side.
Further, the metal plate 31 is formed with a connection hole portion 39 (see FIG. 3) penetrating the front and back of the outer conductor mounting portion 37.

As shown in FIG. 2, the flexible printed circuit board 32 has a base material 41 made of an insulating flexible resin film, and a plurality of conductors made of copper foil are formed on the surface that is one surface of the base material 41. A circuit 42 is attached by an adhesive layer 43. The flexible printed circuit board 32 is provided with an adhesive layer 44 on the back surface, which is the other surface.
The back surface of the flexible printed circuit board 32 is bonded to the metal plate 31 with an adhesive layer 44. The flexible printed circuit board 32 covers the entire center conductor mounting portion 36 so that the side opposite to the insertion side of the base material 41 covers the external conductor mounting portion 37 until the position where the center conductor 21 and the metal plate 31 are prevented from contacting each other. Affixed to the area to be covered.

  Further, a part of the flexible printed circuit board 32 is folded back to the back surface side (the metal plate 31 side) at the front end of the metal plate 31 and attached to the back side of the central conductor mounting portion 36 on the front end side with respect to the step 35. . The metal plate 31 has a shape in which the center conductor mounting portion 36 side on the tip side with respect to the step 35 is disposed closer to the center conductor 21 side than the outer conductor mounting portion 37 and is recessed when viewed from the lower surface side. The folded portion of the flexible printed circuit board 32 attached to the back side of the central conductor mounting portion 36 on the front end side with respect to the step 35 is accommodated in the recessed portion on the front end side with respect to the step 35 of the metal plate 31. Thereby, the downward protrusion amount of the folded portion of the flexible printed circuit board 32 is kept small.

  The plurality of conductor circuits 42 are affixed to the base material 41 along the axial direction of the small-diameter coaxial cable 12 with a gap between them at the same parallel pitch P as the small-diameter coaxial cable 12. These conductor circuits 42 are provided over a portion in contact with the central conductor 21 and the folded base material 41.

  As shown in FIG. 3, each conductor circuit 42 has a narrow portion 42a having a narrow width and a contact 42b having a wide width, and the narrow portion 42a and the contact 42b are formed of a central conductor. It is arranged on the back side of the mounting part 36. The positions of the respective contacts 42b are alternately shifted in the direction orthogonal to the arrangement direction, and as a result, the contacts 42b are arranged in a staggered manner with a gap between them on the back side of the central conductor mounting portion 36. Has been. Therefore, even when the pitch is narrow, the wide contacts 42b can be efficiently arranged.

  The center conductor 21 of the small-diameter coaxial cable 12 is disposed on the conductor circuit 42 in the center conductor mounting portion 36 and connected to the conductor circuit 42 by soldering or the like. The thin coaxial cable 12 has its outer conductor 23 held together by a pair of ground bars 51 and 52. Thereby, in the thin coaxial cable 12, the outer conductor 23 is electrically connected to each other by the ground bars 51 and 52. The outer conductor 23 of each small-diameter coaxial cable 12 may be connected to the ground bars 51 and 52 by soldering or the like, and the ground bars 51 and 52 may be connected to each other by tightening the ground bars 51 and 52 with screws or the like. You may fix between.

  The ground bars 51 and 52 that fix the outer conductor 23 of the small-diameter coaxial cable 12 and conduct each other are disposed on the outer conductor mounting portion 37 of the metal plate 31. The ground bar 52 and the metal plate 31 are conductively connected by the solder 53 filled in the connection hole 39 formed in the external conductor mounting portion 37. Note that the outer conductor 23 of the small-diameter coaxial cable 12 may be directly connected to the metal plate 31 by soldering.

  The metal plate 31 has a shape in which the outer conductor mounting portion 37 on the rear end side with respect to the step 35 is disposed farther from the center conductor 21 than the center conductor mounting portion 36 and is recessed when viewed from the upper surface side. The portion of the outer conductor 23 of the small-diameter coaxial cable 12 disposed on the front side of the outer conductor mounting portion 37 on the rear end side with respect to the step 35 is accommodated in the recessed portion on the rear end side with respect to the step 35 of the metal plate 31. . As a result, the upward protruding amount of the outer conductor 23 sandwiched between the ground bars 51 and 52 is kept small.

  A resin film 55 having an insulating property is attached to the flexible printed circuit board 32 with an adhesive at a portion of the flexible printed circuit board 32 where the central conductor 21 is connected to the conductive circuit 42 to cover the central conductor 21 and the conductive circuit 42. . Thereby, the conductor circuit 42 of the flexible printed circuit board 32 and the center conductor 21 connected to the conductor circuit 42 are protected by the resin film 55.

  The resin film 55 has grooves 56 corresponding to the diameter and pitch of the central conductor 21. These groove portions 56 accommodate the central conductor 21 connected to the conductor circuit 42. Thereby, the upper surface of the resin film 55 is a flat surface without any irregularities formed by the central conductor 21.

  The connecting member 13 including the resin film 55 has a thickness dimension on the insertion side corresponding to the opening thickness of the existing connector to which the end portion of the flat cable is connected. For example, in a connector having a parallel pitch P of 0.4 mm or more, the thickness of the end portion of the flat cable is set to 0.3 mm, and the thickness of the connecting member 31 on the insertion side is also set to 0.3 mm. Further, in the connector having the parallel pitch P of 0.3 mm, the thickness of the flat cable end is 0.2 mm, and the thickness of the connecting member 31 on the insertion side is also 0.2 mm.

Next, the case where the thin coaxial harness 11 having the above configuration is connected to the connector will be described.
As shown in FIG. 4, the connector 61 into which the connection member 13 of the small-diameter coaxial harness 11 is inserted and removed is mounted on the circuit board 60. The connector 61 includes a plurality of connection terminals 63 in a housing 62. Similar to the contacts 42b of the connection member 13, these connection terminals 63 are alternately shifted in a direction orthogonal to the arrangement direction and arranged in a staggered manner. In addition, a ground contact 64 is provided on the circuit board 60 on the insertion / extraction side of the connection member 13 in the connector 61.

When the connecting member 13 is inserted into the connector 61, the connecting terminal 63 in the housing 62 of the connector 61 is brought into pressure contact with the contact 42 b of the connecting member 13 and is conducted. Thereby, the central conductor 21 of the small-diameter coaxial cable 12 is electrically connected to the wiring of the circuit board 60 via the conductor circuit 42 of the connection member 13 and the connection terminal 63 of the connector 61.
Further, the ground terminal portion 38 formed on the metal plate 31 of the connection member 13 is disposed on the ground contact 64 of the circuit board 60, and is pressed against the ground contact 64 by the elastic force of the ground terminal portion 38 to be conducted. Thereby, the outer conductor 23 of the small-diameter coaxial cable 12 is electrically connected to the ground of the circuit board 60 via the ground terminal portion 38 of the metal plate 31.

  As described above, according to the small-diameter coaxial harness 11 according to the embodiment, the center conductor 21 of the small-diameter coaxial cable 12 is connected to the conductor circuit 42 of the flexible printed board 32, and the metal plate 31 of the flexible printed board 32 is connected. The affixed part is a part to be inserted into and removed from the connector 61. A part of the conductor circuit 42 is a contact 42 b that is electrically connected to the connector 61. With this configuration, the axial dimension of the small-diameter coaxial cable 12 in the connecting member 13 can be significantly reduced, and it can be suitably used as a wiring for an electronic device that requires high-density mounting. Moreover, since it is the structure which affixed the flexible printed circuit board 32 to the metal plate 31, it can make thin compared with the case where a hard board | substrate is used, and can respond to the existing connector for flat cable harnesses.

For example, in a structure that connects to a connector using a relay board made of a hard board, a fitting part that fits into the connector and a mounting part that mounts a small-diameter coaxial cable so as not to overlap the fitting part are required. For this reason, the dimension from the end of the inner insulator of the coaxial cable to the end of the fitting portion of the relay board becomes as large as about 10 mm.
On the other hand, in the thin coaxial harness 11 according to the present embodiment, the dimension of the equivalent part can be suppressed to about 2 mm to 3 mm, which is equivalent to the terminal part of the flat cable.

  Further, since the outer conductor 23 is conductively connected to the metal plate 31, the metal plate 31 can have a metal shell function, and can function as a ground current path or function as a shielding material. Can do.

  When a relay board made of a hard board is used, if one surface of the relay board is the mounting surface of the small-diameter coaxial cable and the other surface is the contact terminal surface with the connector, a through hole such as a VIA hole is formed on the relay board. However, it is difficult to deal with narrow pitch wiring by high-density mounting because there is a limit to finely forming the through hole. In addition, it is possible to deal with narrow pitch by arranging the through holes in a staggered manner, or adopting side wiring that provides wiring that passes through the side surface instead of through holes, but with such a special structure Then, the cost increases due to the complexity of the structure.

  On the other hand, in the small-diameter coaxial harness 11 according to the present embodiment, a part of the flexible printed circuit board 32 is folded and pasted to the back side of the metal plate 31, and a part of the conductor circuit 42 on the back side of the metal plate 31 is attached. Since the contact 42b is used, it is possible to easily cope with narrow pitch wiring by high-density mounting and to reduce the cost by simplifying the structure, compared with a wiring provided with a through hole such as a VIA hole. You can also

In the above embodiment, by attaching the resin film 55, the thickness dimension on the insertion side of the connecting member 13 to the connector 61 corresponds to the opening thickness of the existing connector to which the end portion of the flat cable is connected. However, a rib or the like may be provided on the connector 61 side to hold the connecting member 13 without rattling.
Further, a part of the conductor circuit 42 on the surface side connected to the central conductor 21 may be a contact for conducting to the connector. Further, the shape of the contact is not limited to a width wider than other portions of the conductor circuit 42.

11: Thin coaxial cable harness with connecting member, 12: Thin coaxial cable, 13: Connecting member, 21: Center conductor, 23: External conductor, 31: Metal plate, 32: Flexible printed circuit board, 42: Conductor circuit, 42b : Contact, 55: resin film, 56: groove, 61: connector

Claims (4)

A small-diameter coaxial cable with a connecting member in which a plurality of small-diameter coaxial cables whose central conductor and outer conductor are exposed at the end are arranged in parallel and a connecting member that can be inserted into and removed from the connector is connected to the end of the small-diameter coaxial cable A harness,
The connection member is composed of a metal plate and a flexible printed circuit board,
Conductor circuits are provided on one surface of the flexible printed circuit board,
The other surface of the flexible printed circuit board is attached to the metal plate,
The outer conductor of the thin coaxial cable is connected to the metal plate;
The central conductor of the small coaxial cable is connected to the conductor circuit;
A small-diameter coaxial cable harness with a connecting member, wherein a part of the conductor circuit is a contact point that conducts with the connector. A thin coaxial cable harness with a connecting member according to claim 1,
A part of the flexible printed circuit board is folded to the metal plate side, and the other surface of the flexible printed circuit board is attached to both surfaces of the metal plate,
A thin coaxial cable harness with a connecting member, wherein the conductor circuit folded back to the metal plate is used as the contact. A thin coaxial cable harness with a connection member according to claim 1 or 2,
A thin coaxial cable harness with a connecting member, wherein a resin film covering the center conductor is attached to a surface of the flexible printed circuit board where the center conductor is connected to the conductor circuit. A thin coaxial cable harness with a connecting member according to claim 3,
A thin coaxial cable harness with a connecting member, wherein the resin film is formed with a plurality of grooves, and the central conductor connected to the conductor circuit is accommodated in the grooves.

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