JP2013239270A - Connection structure, connection method, and differential signal transmission cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connection structure, a connection method, and a differential signal transmission cable, which are capable of facilitating electrical connection between a shield and a substrate, preventing an insulator from being deformed and melted during solder connection work, and preventing deterioration in transmission characteristics.SOLUTION: In a connection structure, a differential signal transmission cable 10 is connected to a substrate via a connection tape 20 which includes a circumferential part 21 wound around a shield 13 exposed at an end part of the cable and one or more projection parts 22 projected from the circumferential part 21. The connection tape 20 is connected to the shield 13 via the circumferential part 21, and also connected to the substrate via the projection parts 22.

Description

  The present invention relates to a connection structure between a differential signal transmission cable and a substrate, a connection method between the differential signal transmission cable and a substrate, and a differential signal transmission cable.

  Many high-speed transmission cables connecting electronic devices propagate differential signals. In this cable, two cores (inner conductor) and an insulator are twisted in the longitudinal direction or arranged in parallel, and a shield (outer conductor) for suppressing the influence of external noise is wound outside the insulator. The structure is The insulator is mainly made of foamed polyethylene, and the shield is made of metal foil tape.

  When conducting between the differential signal transmission cable and the electronic device, the core wire is soldered to a connector wired in the electronic device or a signal pad of the printed circuit board to be electrically connected. Further, when connecting to the substrate, it is necessary to connect the shield exposed at the end of the differential signal transmission cable to the ground electrode on the substrate in order to obtain ground.

  As a method of connecting the shield to the ground electrode on the substrate, there is a method of connecting the shield directly to the ground electrode on the substrate by solder when there is no drain line.

  In addition, when a drain line is provided, there is a method of connecting the drain line to a ground electrode on the substrate by soldering (see, for example, Patent Document 1 and Patent Document 2).

JP 2002-289047 A JP 2003-297155 A

  However, when there is no drain wire, that is, according to the method in which the shield is directly connected to the ground electrode on the substrate by solder, the insulation (foamed polyethylene) in the cable is caused by heating or pressurizing during solder connection work. Is deformed or melted, resulting in variations (fluctuations) in characteristic impedance and significant deterioration in skew characteristics, resulting in a problem of poor transmission characteristics.

  In addition, the method of connecting the drain line to the ground electrode on the substrate by soldering also deteriorates the transmission characteristic due to the deformation of the insulator by the drain line, and thus meets the recent demand for further improvement of the transmission characteristic. There is a problem that it is difficult. For example, as in Patent Document 1, if the insulator has a drain line at the right end or the left end, the drain line crushes one insulator in the jacket (sheath) coating process, so the differential mode balance is lost, Electrical characteristics deteriorate at high frequencies in the GHz band.

  Furthermore, as in Patent Document 2, when the drain line is provided at the center of the insulator, the balance of the differential mode is less distorted than when the drain line is provided at the right end or the left end, but the cable terminal is connected to the connector or the printed board. In this case, since the heights of the lead-out portions of the core line and the drain line are different, the lead-out length of the drain line becomes longer than when the drain line is provided at the right end or the left end. As a result, the electrical characteristics are deteriorated, and the difficulty of connecting the drain wires is increased.

  Therefore, an object of the present invention is to provide a connection structure, a connection method, and a differential that facilitate electrical connection between a shield and a substrate, prevent deformation and melting of an insulator during solder connection work, and prevent deterioration of transmission characteristics. It is to provide a signal transmission cable. In the present invention, the connection to the board includes not only direct connection but also connection through a connector or the like (that is, the direct connection destination is a connector or the like).

  In order to achieve the above object, the present invention provides the following [1] to [13] connection structure, connection method, and differential signal transmission cable.

[1] A differential signal transmission cable is connected to a substrate through a connection tape including a loop portion wound around a shield exposed at an end portion of the cable and one or more protrusions protruding from the loop portion. A connected structure,
The connection structure is characterized in that the connection tape is connected to the shield via the rotating portion and is connected to the substrate via the protrusion.
[2] The connection structure according to [1], wherein the connection tape includes two or more protrusions.
[3] The connecting tape includes the surrounding portion wound around the shield exposed at the end of one or more differential signal transmission cables and the number of the differential signal transmission cables plus one protrusion. The connection structure according to [1] or [2], wherein the connection structure is provided.
[4] The connection tape includes the winding portion and the two protruding portions wound around a shield exposed at an end portion of the one differential signal transmission cable. Thru | or the connection structure as described in any one of [3].
[5] The connection tape includes the winding portion and the three protrusions wound around a shield exposed at ends of the two differential signal transmission cables. Thru | or the connection structure as described in any one of [3].
[6] The connection structure according to any one of [1] to [5], wherein the protrusion is protruded in a vertical direction from the rotating portion.
[7] The connection according to any one of [1] to [5], wherein the protrusion is protruded from the rotating portion in a direction having an acute angle or an obtuse angle. Construction.
[8] The above [1] to [7], wherein the protruding portion is protruded from the surrounding portion so that an interval between adjacent protruding portions is equal to a width of the cable. ] The connection structure as described in any one of.
[9] The above [1] to [1], wherein the protruding portion protrudes from the rotating portion in a direction substantially parallel to the core wire exposed at the end of the differential signal transmission cable. [8] The connection structure according to any one of [8].
[10] The above-mentioned [1], wherein the protruding portion protrudes from the circulating portion so as to be the same height as the core wire exposed at the end of the differential signal transmission cable. Thru | or the connection structure as described in any one of [9].
[11] The connection structure according to any one of [1] to [10], wherein the circumferential portion is fixed to the shield with solder, an adhesive, or an adhesive tape.
[12] A connection method for connecting the differential signal transmission cable to the substrate via the connection tape used in the connection structure according to any one of [1] to [11],
After the connection tape is wound around the shield, the connection method is fixed with solder, an adhesive, or an adhesive tape so as not to unwind the shield.
[13] A differential signal transmission cable used in the connection structure according to any one of [1] to [11], wherein the connection tape is connected to the shield exposed at one or both ends. A differential signal transmission cable characterized by the above.

  According to the present invention, a connection structure, a connection method, and differential signal transmission that facilitate electrical connection between a shield and a substrate, prevent deformation and melting of an insulator during solder connection work, and prevent deterioration of transmission characteristics. Cables can be provided.

It is a perspective view which shows the end of the cable for differential signal transmission used for the connection structure which concerns on the 1st Embodiment of this invention. (A) is the schematic of the connection tape used for the connection structure which concerns on the 1st Embodiment of this invention, (b) is the schematic which shows the modification of (a). It is a perspective view which shows the end of the cable for differential signal transmission used for the connection structure which concerns on the modification of the 1st Embodiment of this invention. It is a perspective view which shows the end of the cable for differential signal transmission used for the connection structure which concerns on the 2nd Embodiment of this invention. It is the schematic of the connection tape used for the connection structure which concerns on the 2nd Embodiment of this invention.

[First embodiment of the present invention]
(Configuration of differential signal transmission cable used for connection structure)
FIG. 1 is a perspective view showing one end of a differential signal transmission cable used in the connection structure according to the first embodiment of the present invention. FIG. 2A is a schematic view of a connection tape used for the connection structure according to the first embodiment of the present invention, and FIG. 2B is a schematic view showing a modification of FIG. FIG.

  The differential signal transmission cable used in the connection structure according to the first embodiment includes a cable 10 and a connection tape 20 connected to shields 13 exposed at both ends of the cable 10. The connection tape 20 may be connected to only one end of the cable 10 (the same applies to a modified example of the first embodiment and a second embodiment described later).

  The cable 10 is not particularly limited. For example, as shown in FIG. 1, a pair of core wires 11 arranged in parallel, an insulator 12 that collectively covers the pair of core wires 11, and insulation A differential signal transmission cable including a shield 13 covering the body 12 and a jacket 14 covering the shield 13 can be used. The cable 10 is connected to a substrate (not shown) via the connection tape 20. Since the ground can be taken via the connection tape 20, the drain line can be dispensed with.

  The core wire 11 is, for example, a single wire of a good electric conductor such as copper, or a single wire obtained by plating the electric conductor.

  The insulator 12 is formed using a material having a small dielectric constant and dielectric loss tangent, for example. This material is, for example, a foamed insulating resin such as polytetrafluoroethylene (PTFE), polyethylene, perfluoroalkoxyalkane (PFA), foamed polyethylene or foamed Teflon (Teflon is a registered trademark).

  As shown in FIG. 1, when using an insulator 12 that collectively covers a pair of core wires 11, the cross-sectional shape of the insulator 12 is preferably an elliptical shape that is long in the direction in which the pair of core wires 11 are arranged. Moreover, it is also preferable to set it as the flat ellipse shape which has a flat part parallel with the arrangement direction of a pair of core wire 11. FIG.

  The shield 13 can be formed by, for example, winding a metal foil tape around the insulator 12 in a spiral shape. The metal foil tape is formed by bonding a plastic tape such as PET (polyethylene terephthalate) and a metal foil such as copper foil or aluminum foil.

  The jacket 14 is also referred to as a sheath, and is formed using, for example, polyvinyl chloride (PVC) resin, polyolefin resin, or fluororesin.

  The connection tape 20 includes a circumferential portion 21 wound around the shield 13 exposed at the end of the cable 10 and two protrusions 22 protruding from the circumferential portion 21.

  The connection tape 20 is connected to the shield 13 via the rotating portion 21 and is connected to the substrate via the protrusion 22.

  The winding portion 21 is preferably fixed to the shield 13 with the solder 30 so as not to be unwound around the shield 13 after being wound around the shield 13 preferably two or more times, more preferably 2-5 times. It is preferable that at least a portion including the end portion of the circumferential portion 21 is soldered. If fixed, the solder may be spotted.

  FIG. 3 is a perspective view showing one end of a differential signal transmission cable used in the connection structure according to the modification of the first embodiment of the present invention. In the modified example, the winding portion 21 is fixed to the shield 13 with the adhesive tape 40 so that the winding portion 21 is not unwound after being wound around the shield 13 preferably two or more times, more preferably 2-5 times. The Instead of the adhesive tape 40, an adhesive or the like may be used.

  The fixing with the solder 30 or the adhesive tape 40 is preferably performed on the side opposite to the side to which the substrate is connected (the upper side in FIGS. 1 and 3). In particular, it is preferable that soldering or the like is performed near the center in the cable width direction on the opposite side.

  Although the thickness of the circumference part 21 is not specifically limited, It is desirable to have the thickness which is not cut | disconnected easily. For example, in the case of a 30 AWG differential signal transmission cable, the desired thickness of the circulating portion 21 is preferably 5 mm or more, and more preferably 5 to 20 mm.

  The number of the protrusions 22 may be one, or three or more, but the number of the differential signal transmission cables 10 (one in the present embodiment) around which the circulating portion 21 is wound plus one = 2. As shown in FIG. 1, it is preferable that there are two cables, one on each side of the left end and the right end in the width direction of the cable 10. That is, the protruding portion 22 is projected from the rotating portion 21 so that the interval between two adjacent protruding portions is equal to the width of the cable 10, so that transmission characteristics can be balanced. preferable.

  As shown in FIG. 2A, the protrusion 22 protrudes from the rotating portion 21 in the vertical direction. Alternatively, as shown in FIG. 2B, a connection tape 120 having a protrusion 122 protruding from the rotating portion 121 in a direction having an acute angle or an obtuse angle can be used. In FIG. 2B, the angle indicated by α is preferably 91 to 130 ° from the viewpoint that the winding portion can be easily wound around the shield, and more preferably 95 to 125 °.

  As shown in FIG. 1, the protrusion 22 is preferably protruded from the rotating portion 21 in a direction substantially parallel to the core wire 11 exposed at the end of the cable 10. The thickness of the protrusion 22 is not particularly limited, but it is desirable that the protrusion 22 has a thickness that is not easily cut. Although the desired thickness of the protrusion 22 varies depending on the cable diameter, for example, in the case of a 30 AWG differential signal transmission cable, it is preferably 4 mm or more, and more preferably 4 to 18 mm. The length of the protrusion 22 is not particularly limited, and can be adjusted as appropriate.

  The protrusion 22 is preferably formed to protrude so as to be the same height as the core wire 11 exposed at the end of the cable 10. By using the same height, it is preferable that the core wire 11 need not be bent downward and can be connected straight to the substrate.

  The material of the connection tape 20 is not particularly limited, and any material that can be wound around the shield 13 and has electrical conductivity may be used. Metal materials such as SUS, copper, silver, tin, and aluminum may be used. Can be used.

  In the present embodiment, the connecting tape 20 has a linear shape for both the circulating portion 21 and the protruding portion 22, but is not limited thereto, and may be a zigzag shape.

(Connection procedure for connection structure)
As a connection procedure of the connection structure according to the first embodiment of the present invention, the connection tape 20 and 120 shown in FIG. 1 and FIG. , 122 are parallel to the substrate and connected to the substrate by soldering or the like.

(Effects of the first embodiment of the present invention)
According to the present embodiment, the following effects can be obtained.
(1) A connection structure, a connection method, and a differential signal transmission cable that facilitate electrical connection between the shield and the substrate, prevent deformation and melting of the insulator during solder connection work, and prevent deterioration of transmission characteristics. Can be provided.
(2) Since the drain line can be dispensed with, it is possible to prevent electrical characteristic deterioration (such as variations in characteristic impedance at the connecting portion and deterioration in skew characteristics) accompanying the drain line drawing.
(3) Since the connecting tape can be connected to the shield only by spotting a small amount of solder, the effect of preventing deformation and melting of the insulator is high.
(4) Since the connection tape is wound several times and pressed and fixed with an adhesive or an adhesive tape, the connection tape can be connected to the shield without heating, so that the effect of preventing deformation and melting of the insulator is high.
(5) Since the metal tape as the connection tape has flexibility and flexibility compared to the metal member generally used for the drain wire, the drain tape can be obtained by using a metal tape provided with a protruding portion at the circumferential portion. The ground connection is easier than the line.
(6) Since the metal tape as the connection tape can be obtained at a relatively low price, the manufacturing cost can be suppressed.
(7) Since the shape of the connection tape can be easily changed, the workability at the time of connection is excellent.

[Second Embodiment of the Present Invention]
(Configuration of differential signal transmission cable used for connection structure)
FIG. 4 is a perspective view showing one end of a differential signal transmission cable used in the connection structure according to the second embodiment of the present invention. FIG. 5 is a schematic view of a connection tape used in the connection structure according to the second embodiment of the present invention.

  The differential signal transmission cable used in the connection structure according to the second embodiment includes two cables 10 in parallel, and a connection tape 220 connected to the shield 13 exposed at both ends or one end of each cable 10. Is provided.

  The connection tape 220 includes a winding portion 221 wound around the shield 13 exposed at the end of the cable 10 and three protrusions 222 protruding from the winding portion 221.

  The connection tape 220 is connected to the shield 13 via the rotating portion 221 and is connected to the substrate via the protrusion 222.

  The number of the protrusions 222 can be one to two, or four or more. However, the number of the differential signal transmission cables 10 around which the circulatory part 221 is wound (two in this embodiment) +1 and three is as follows. As shown in FIG. 4, it is preferable that there are three cables, one on each side of the leftmost and rightmost ends in the width direction of the cable 10, and one between the cables 10. That is, the protrusion 222 protrudes from the loop portion 221 so that the interval between the two adjacent protrusions is equal to the width of the cable 10, so that transmission characteristics can be balanced. preferable. Moreover, signal interference can be prevented by providing one between the cables 10.

  Since other points are the same as those of the first embodiment, description thereof is omitted.

  In the present embodiment, two cables 10 are arranged in parallel, but can be three or more. In this case, it is desirable that the protrusions 222 are formed so as to protrude from the surrounding portions 221 between the cables 10. In other words, the connection tape preferably includes the number of the cables 10 plus one protrusion.

  In addition, two cables 10 arranged in parallel can be stacked in two stages, and a connection tape can be wound around the four cables 10 at the same time. In this case, the two cables 10 are connected to the surface of the board, Two cables 10 are connected to the back surface.

(Effect of the second embodiment of the present invention)
According to the present embodiment, the following effects can be obtained.
(1) The same effects as those of the first embodiment can be obtained.
(2) A large number of cables 10 can be connected simultaneously, and workability can be improved.

[Other Embodiments of the Present Invention]
As mentioned above, although embodiment of this invention was described, this invention is not limited to these embodiment, In the range which does not deviate from the main point of invention, various deformation | transformation implementation is possible.

10: Cable (differential signal transmission cable)
DESCRIPTION OF SYMBOLS 11: Core wire, 12: Insulator, 13: Shield, 14: Jacket 20, 120, 220: Connection tape 21, 121, 221: Circulation part 22, 122, 222: Protrusion part 30: Solder, 40: Adhesive tape

Claims (13)

A connection in which a differential signal transmission cable is connected to a substrate via a connection tape including a winding portion wound around a shield exposed at an end of the cable and one or more protrusions protruding from the winding portion. Structure,
The connection structure is characterized in that the connection tape is connected to the shield via the rotating portion and is connected to the substrate via the protrusion.   The connection structure according to claim 1, wherein the connection tape includes two or more protrusions.   The connection tape includes the circumference portion wound around a shield exposed at an end portion of one or more differential signal transmission cables and the number of the differential signal transmission cables plus one protrusion portion. The connection structure according to claim 1, wherein the connection structure is characterized.   The said connection tape is provided with the said surrounding part wound around the shield exposed at the edge part of the said one cable for differential signal transmission, and the two said projection parts, The any one of Claim 1 thru | or 3 characterized by the above-mentioned. The connection structure according to claim 1.   4. The connection tape according to claim 1, wherein the connection tape includes the circumferential portion wound around the shield exposed at the ends of the two differential signal transmission cables and the three protrusions. 5. The connection structure according to claim 1.   The connection structure according to claim 1, wherein the protruding portion protrudes in a vertical direction from the circumferential portion.   The connection structure according to any one of claims 1 to 5, wherein the protruding portion protrudes from the circumferential portion in a direction having an acute angle or an obtuse angle.   8. The projecting portion according to claim 1, wherein the projecting portion protrudes from the surrounding portion so that an interval between adjacent projecting portions is equal to a lateral width of the cable. 9. The connection structure described in 1.   9. The protruding portion according to claim 1, wherein the protruding portion protrudes from the rotating portion in a direction substantially parallel to a core wire exposed at an end portion of the differential signal transmission cable. The connection structure according to item 1.   10. The protruding portion according to claim 1, wherein the protruding portion protrudes from the rotating portion so as to be at the same height as the core wire exposed at the end portion of the differential signal transmission cable. The connection structure according to claim 1.   The connection structure according to any one of claims 1 to 10, wherein the circumferential portion is fixed to the shield with solder, an adhesive, or an adhesive tape. A connection method for connecting the differential signal transmission cable to the substrate via the connection tape used in the connection structure according to any one of claims 1 to 11,
After the connection tape is wound around the shield, the connection method is fixed with solder, an adhesive, or an adhesive tape so as not to unwind the shield. The differential signal transmission cable used in the connection structure according to any one of claims 1 to 11, wherein the connection tape is connected to the shield exposed at one or both ends. Cable for differential signal transmission.

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