JP2014093205A - Harness - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a harness in which while excellent assembly workability is possessed, favorable EMI countermeasures can be performed.SOLUTION: A harness 1 is a harness that is built in a housing of an electronic apparatus, and includes: a cable group including two or more coaxial cables 3; a connector 2 that is mounted on at least one end of the cable group, and electrically connected to these coaxial cables 3; and conductivity cover 4 that covers at least one end of the cable group, and is electrically connected to the connector 2.

Description

  The present invention relates to a harness having a plurality of coaxial cables.

  There is known a multi-core cable formed by twisting a coaxial cable unit in which a plurality of micro coaxial cables are fixed at a predetermined pitch using a tape (see, for example, Patent Document 1).

JP 2003-229030 A

  Mobile phones, notebook computers, video cameras, and the like are highly demanded for miniaturization, and when assembling these electronic devices, it is required to wire cables in a narrow space.

  However, since the multi-core cable is easily deformed, it is difficult to assemble in a narrow space, and there is a problem that the assembling workability of the electronic device is lowered. In addition, a large number of cables are accommodated in a narrow space, and advanced EMI (Electro-Magnetic Interference) measures are required as the speed of electronic devices increases.

  The problem to be solved by the present invention is to provide a harness capable of taking good EMI countermeasures while having excellent assembly workability.

  [1] A harness according to the present invention is a harness incorporated in a housing of an electronic device, the cable group including a plurality of coaxial cables, and attached to at least one end of the cable group, and electrically connected to the coaxial cable. It is characterized by comprising: a connected connector; and a conductive cover that covers at least one end of the cable group and is electrically connected to the connector.

  [2] In the above invention, the conductive cover may have a surrounding wall that surrounds the cable group and holds a predetermined outer shape.

  [3] In the above invention, the harness further includes a conductive tape or a conductive tube that covers a portion of the cable group exposed from the conductive cover, and the conductive tape or the conductive tube. May be electrically connected to the conductive cover.

  According to the present invention, a conductive cover that covers one end of the cable group and is electrically connected to the connector is provided. Thereby, regularity can be given to the end of the said cable group, and the assembly workability | operativity of an electronic device improves. Further, since the conductive cover is electrically connected to the connector, a good EMI countermeasure can be taken.

FIG. 1 is a plan view showing a harness according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing the coaxial cable in the embodiment of the present invention. 3 is a cross-sectional view taken along line III-III in FIG. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. FIG. 5 is a cross-sectional view taken along the line VV in FIG. FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. FIG. 8 is an enlarged view of a portion VIII in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a plan view showing a harness 1 in the present embodiment, FIG. 2 is a sectional view showing a coaxial cable 3 in the present embodiment, and FIGS. 3 to 7 are sectional views of the harness 1 shown in FIG. FIG. 8 is an enlarged view showing an overlapping portion of the conductive tape 5 and the conductive case 4 in the present embodiment.

  As shown in FIG. 1, the harness 1 in this embodiment includes a coaxial cable 3, a connector 2 attached to one end of the coaxial cable 3, a conductive case 4 covering one end of the coaxial cable 3, and a conductive case. And an electromagnetic shielding tape 5 covering the coaxial cable 3 exposed from 4.

  In the present embodiment, as shown in FIG. 1, the connector 2 and the conductive case 4 are attached to both ends of the coaxial cable 3, but the present invention is not particularly limited thereto. For example, the connector 2 and the conductive case 4 may be attached to only one end of the coaxial cable 3, and the other end of the coaxial cable 3 may be directly connected to the circuit board. In the following description, the left connector 2 and the conductive case 4 in FIG. 1 are also referred to as a connector 2A and a conductive case 4A, respectively. The right connector 2 and the conductive case 4 in FIG. Also referred to as Case 4B.

  As shown in FIG. 2, the coaxial cable 3 is formed on the inner conductor 31, the insulating member 32 formed on the outer periphery of the inner conductor 31, the outer conductor 33 surrounding the outer periphery of the insulating member 32, and the outer periphery of the outer conductor 33. Cable jacket 34 is provided.

  The internal conductor 31 is a member that conducts the signal terminals 23 (see FIG. 1) of the connector 2 attached to both ends of the coaxial cable 3, and is formed of copper, silver, nickel, or an alloy thereof.

  The insulating member 32 is formed from an insulating resin having a predetermined thickness. Examples of such an insulating resin include polyester resins, polyolefin resins, nylon, and fluorine resins. Specifically, examples of the polyester resin include polyethylene terephthalate, and examples of the polyolefin resin include ethylene propylene copolymer resin, polypropylene, polyethylene, and a mixture thereof. 66 and nylon 6, and examples of the fluorine-based resin include polytetrafluoroethylene, a tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer, and a tetrafluoroethylene-ethylene copolymer. In addition, in polyester-type resin, polyolefin-type resin, and nylon, it is preferable from a viewpoint of improving a flame retardance that metal hydroxide particles, such as magnesium hydroxide, and a phosphorus flame retardant are mixed.

  The outer conductor 33 is a part that functions as a shield layer, and is a braided material in which a wire 331 made of copper, silver, nickel, or an alloy thereof is spirally wound around the outer periphery of the insulating member 32 or the wire is knitted. Is disposed on the outer periphery of the insulating member 32. In the present embodiment, as shown in FIG. 2, the external conductor 33 is configured by 16 wire rods 331 arranged on the outer periphery of the insulating member 32 at substantially equal intervals, but the wire rod constituting the external conductor 33 is formed. The number of 331 is not particularly limited.

  The cable jacket 34 is formed by extruding a thermoplastic resin. Examples of such a thermoplastic resin include polytetrafluoroethylene, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer, and tetrafluoroethylene. -Fluororesin such as ethylene copolymer.

  As shown in FIG. 4, the outer conductor 33 is led out from the cable jacket 34, the insulating member 32 is led out from the outer conductor 33, and the inner conductor 31 is led out from the insulating member 32. Yes.

  In the present embodiment, as shown in FIG. 3, a total of eight coaxial cables 3 are arranged in a line at substantially equal intervals in a ground bar 26 to be described later, and the inner conductors 31 of these coaxial cables 3 are 4 are electrically connected to the signal terminals 23 of the connector 2, respectively. In addition, the number of the coaxial cables 3 used for the harness 1 is not specifically limited.

  As shown in FIG. 1, FIG. 4 or FIG. 5, the connector 2 is disposed adjacent to a connector base 25 having a signal terminal 23 and a ground terminal 24 formed on the upper surface, and an end 251 of the connector base 25. A ground bar 26 and a connector cover 27 that protects the connection of the coaxial cable 3.

  The connector base 25 is formed of an insulating member having a substantially rectangular flat plate shape. As shown in FIG. 1, eight signal terminals 23 are provided on the upper surface of the connector base 25 so as to be arranged at substantially equal intervals. One ground terminal 24 is provided on the left side of the signal terminals 23 in the drawing. Is provided. The number of signal terminals 23 and the position where the ground terminals 24 are provided are not particularly limited.

  As shown in FIG. 5, the ground terminal 24 has a protruding portion 241 protruding from the connector base 25 to the left side in the drawing, and this protruding portion 241 is accommodated in a region surrounded by a ground bar 26 described later. ing.

  As shown in FIG. 3, the ground bar 26 includes a lower member 261 having a substantially U-shaped cross-sectional shape, an upper member 262 having a flat plate shape and disposed on the upper inner side of the lower member 261, It has. In the present embodiment, as shown in FIG. 3, the coaxial cables 3 arranged in a row are arranged inside the lower member 261, and the upper member 262 is arranged from above in the figure so as to sandwich the coaxial cable 3. ing.

  Further, as shown in the figure, a protrusion 241 of the ground terminal 24 is inserted on the left side of the eight coaxial cables 3 in the ground bar 26, and solder 266 is provided in a region surrounded by the ground bar 26. Is filled. Thus, the outer conductor 33 and the ground terminal 24 of the eight coaxial cables 3 and the lower member 261 and the upper member 262 of the ground bar 26 are mechanically fixed to each other and electrically connected to each other. Yes.

  The connector cover 27 is a member for protecting the connection between the inner conductor 31 and the signal terminal 23 of the coaxial cable 3 and the connection between the ground terminal 24 and the ground bar 26, as shown in FIGS. In addition, it has an inner circumference substantially equal to the outer circumference of the ground bar 26 and has a plate cylinder shape longer than the lead portion of the coaxial cable 3. The connector cover 27 is made of phosphor bronze or the like plated with gold and is provided so as to surround the lead portion of the coaxial cable 3 and the ground bar 26.

  Further, a through hole 271 is provided in the upper portion of the connector cover 27 in FIG. 3, and the inside of the through hole 271 is filled with solder 272. Thus, the connector cover 27 and the ground bar 26 are electrically connected and mechanically fixed. The position and number of the through holes 271 provided in the connector cover 27 are not particularly limited.

  The conductive case 4 is made of a conductive metal material such as stainless steel or copper, and includes a lower case 41 and an upper case 42. The lower case 41 and the upper case 42 are formed by bending the conductive metal material formed into a predetermined shape by punching or etching. As shown in FIG. 1, the conductive case 4 in the present embodiment has a substantially L-shape, but the shape of the conductive case 4 is a wiring space when the harness 1 is incorporated in an electronic device. There is no particular limitation as long as it corresponds. Further, the outer surface of the conductive case 4 may be colored in an arbitrary color in order to improve discrimination. The conductive case 4 in the present embodiment corresponds to an example of a conductive cover in the present invention.

  As shown in FIGS. 3 and 6, the lower case 41 has wall surfaces 411 to 413, and the cross section perpendicular to the wiring direction of the coaxial cable 3 housed in the lower case 41 is substantially U-shaped. It has the shape of Similarly, the upper case 42 has wall surfaces 421 to 423, and a cross section in a direction perpendicular to the wiring direction of the coaxial cable 3 housed in the upper case 42 has a substantially U-shaped shape. Yes. In the present embodiment, the lower case 41 has a size and shape that fits in the upper case 42. Note that the wall surfaces 411 to 413 of the lower case 41 and the wall surfaces 421 to 423 of the upper case 42 in the present embodiment correspond to an example of an enclosure wall in the present invention.

  As shown in FIG. 4, the coaxial cable 3 is wired between the lower case 41 and the upper case 42, and the right end 273 of the connector cover 27 in the figure is inserted. The lower case 41 and the upper case 42 and between the lower case 41 and the connector cover 27 are mechanically fixed and electrically connected by the solder 43. Note that the method of fixing the lower case 41 and the upper case 42 and the connector cover 27 to the lower case 41 is not particularly limited. For example, the lower case 41 and the upper case 42 may be fixed using a conductive adhesive such as silver paste or aluminum paste.

  In the harness 1 according to the present embodiment, the eight coaxial cables 3 exposed from the conductive cases 4A and 4B are wound around the conductive tape 5 as shown in FIGS. The end portions 44 of the conductive cases 4A and 4B are also wound simultaneously by the conductive tape 5.

  The conductive tape 5 is provided with a conductive adhesive layer including a copper foil, an aluminum foil, a silver foil, a gold foil, etc. on a conductive cloth obtained by plating copper, nickel, or the like on a non-woven fabric made of polyester or the like. It is a formed tape. Instead of the conductive tape 5, a tube formed of a conductive fluororesin or polyurethane resin may be used.

  Next, the operation in this embodiment will be described.

  In the harness 1 according to the present embodiment, both ends of the coaxial cable 3 are covered with a conductive case 4, and the conductive case 4 is formed of a material having higher rigidity than the coaxial cable 3. For this reason, the formability can be imparted to the coaxial cable 3 covered with the conductive case 4. This makes it easier to place the harness 1 at a desired wiring position in a miniaturized electronic device, and improves the assembly workability of the electronic device. This effect becomes more prominent as the number of signal terminals 23 included in one connector 2 increases.

  Further, in the present embodiment, the conductive case 4 is formed of a metal material such as stainless steel or copper, and the conductive case 4 is electrically connected to the ground terminal 24 of the connector 2 via the ground bar 26 or the connector cover 27. Connected. Therefore, even when a large number of cables are accommodated in a small space in a miniaturized electronic device or when a cable is accommodated in a high-speed electronic device, the EMI countermeasures of the electronic device are effective. It is possible to suppress the malfunction of the electronic device.

  In the present embodiment, as shown in FIGS. 1 and 8, the end portions 44 of the conductive cases 4 </ b> A and 4 </ b> B and the coaxial cable 3 exposed from the conductive cases 4 </ b> A and 4 </ b> B are wound with the conductive tape 5. It has been turned. For this reason, the coaxial cable 3 exposed from the conductive cases 4A and 4B can also take measures against EMI, and both ends of the harness 1 can be arbitrarily moved within a predetermined range. Thereby, the connection workability | operativity of the harness 1 can be improved.

  The embodiment described above is described for facilitating the understanding of the present invention, and is not described for limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Harness 2 ... Connector 23 ... Signal terminal 24 ... Ground terminal 26 ... Ground bar 27 ... Connector cover 3 ... Coaxial cable 31 ... Inner conductor 32 ... Insulating member 33 ... External conductor 34 ... Cable jacket 4 ... Conductive case 41 ... Lower case 411-413 ... Wall surface 42 ... Upper case 421-423 ... Wall surface 5 ... Conductive tape

Claims (3)

A harness incorporated in the housing of an electronic device,
A group of cables including a plurality of coaxial cables;
A connector attached to at least one end of the cable group and electrically connected to the coaxial cable;
A harness comprising: a conductive cover that covers at least one end of the cable group and is electrically connected to the connector. The harness according to claim 1,
The conductive cover has a surrounding wall that surrounds the cable group and holds a predetermined outer shape. The harness according to claim 1 or 2,
The harness further includes a conductive tape or a conductive tube that covers a portion of the cable group exposed from the conductive cover,
The conductive tape or the conductive tube is electrically connected to the conductive cover.

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