Terminal connection structure of communication cable and terminal connection method

Abstract

The present application provides a kind of terminal connection structure and terminal connection method of communication cable, even when the conductor interval in communication cable is narrow, the connection of conductor and signal electrode is easy, can inhibit the degradation of signal quality.Communication cable (2) has a pair of conductor (21) arranged in parallel and insulator (22) covering the surrounding of the pair of conductor (21), and has conductor exposure part (2a) that exposes the pair of conductor (21) from the end of insulator (22), the conductor (21) in conductor exposure part (2a) has the connection part (211) shaped in a way that the width (a) in the arrangement direction of the pair of conductor (21) is less than the height (b) in the direction perpendicular to the arrangement direction and the length direction of conductor (21), the interval of connection part (211) is larger than the interval of the pair of conductor (21) in the covering part (2b) covered by insulator (22), and connection part (211) is connected with signal electrode (31) respectively by brazing or welding.

Description

Technical Field

[0001] This invention relates to the terminal connection structure and terminal connection method of communication cables. Background Technology

[0002] Previously, differential signal transmission cables, known as two-core parallel cables (or double-strand cables), were used for communication cables transmitting signals exceeding several Gbit / s. These cables consisted of two insulated wires arranged in parallel with a shielding tape wrapped around them. However, when transmitting high-speed signals exceeding tens of Gbit / s, it is necessary to narrow the spacing between the conductors and enhance the electromagnetic coupling (i.e., strong coupling) between them in order to suppress internal delay differences and ensure normal signal transmission.

[0003] Therefore, in applications transmitting high-speed signals exceeding tens of Gbit / s, communication cables are used that consist of a pair of parallel conductors encased together in an insulator, with a shielding tape wound around the insulator. When connecting this communication cable to a substrate, the insulator is first removed at the cable's end to expose the pair of conductors, and then the exposed conductors are connected to the substrate's signal electrodes by brazing or soldering.

[0004] In addition, as prior art information related to the invention of this application, there is Patent Document 1.

[0005] Patent Document 1: Japanese Patent Application Publication No. 2011-086458 Summary of the Invention

[0006] However, in the aforementioned communication cables, the spacing between the conductors is narrowed to enhance electromagnetic coupling. Consequently, the spacing between the signal electrodes connecting the conductors also becomes very narrow. Therefore, during soldering, there is a problem that the solder easily bridges with adjacent electrodes, making soldering difficult.

[0007] In addition, there is a problem that the impedance of the connection between the communication cable and the substrate becomes extremely low due to the narrowing of the spacing between the signal electrodes, resulting in degraded signal quality.

[0008] Therefore, the object of the present invention is to provide a terminal connection structure and terminal connection method for a communication cable, which makes it easy to connect the conductors to the signal electrodes even when the conductor spacing in the communication cable is narrow, and can also suppress the degradation of signal quality.

[0009] To address the aforementioned problems, this invention provides a terminal connection structure for a communication cable that connects the terminal of the communication cable to a substrate. The communication cable has a pair of parallel conductors and an insulator surrounding the pair of conductors. The substrate has signal electrodes electrically connected to the conductors. The communication cable has conductor exposure portions that expose a predetermined length of the pair of conductors from the end of the insulator. Each conductor in the conductor exposure portion has a connecting portion at its end, shaped such that its width in the arrangement direction of the pair of conductors is smaller than its height in the height direction perpendicular to both the arrangement direction and the length direction of the conductors. The spacing between the connecting portions is larger than the spacing between the pair of conductors in the covering portion covered by the insulator. The connecting portions are connected to the signal electrodes by brazing or welding.

[0010] Furthermore, in order to solve the above-mentioned problems, the present invention provides a method for terminating a communication cable, which connects the terminal of the communication cable to a substrate. The communication cable has a pair of conductors arranged in parallel and an insulator covering the periphery of the pair of conductors. The substrate has signal electrodes electrically connected to the conductors. The terminating method includes the following steps: a conductor exposure step, in which a predetermined length of the pair of conductors is exposed from the end of the insulator to form a conductor exposure portion; a connection portion forming step, in which the end of the conductor in the conductor exposure portion is formed such that the width in the arrangement direction of the pair of conductors is smaller than the height in the height direction perpendicular to both the arrangement direction and the length direction of the conductors, thus forming a connection portion, and the spacing between the connection portions is larger than the spacing between the pair of conductors in the covering portion covered by the insulator; and a connection step, in which the connection portions are respectively connected to the signal electrodes by brazing or welding.

[0011] According to the present invention, a terminal connection structure and terminal connection method for a communication cable are provided, which facilitates the connection between the conductor and the signal electrode even when the conductor spacing in the communication cable is narrow, and also suppresses the degradation of signal quality. Attached Figure Description

[0012] Figure 1 The figures illustrate the terminal connection structure of a communication cable according to an embodiment of the present invention, (a) being a side view, (b) a top view, and (c) being... Figure 1 (b) AA line cross section diagram.

[0013] Figure 2 In the diagram, (a) is a flowchart illustrating the sequence of a communication cable terminal connection method according to an embodiment of the present invention, and (b) is a flowchart illustrating the connection part forming process.

[0014] Figure 3In the diagram, (a) illustrates the first compression process, (b) illustrates the second compression process, and (c) illustrates the third compression process.

[0015] Figure 4 (a) to (c) are diagrams illustrating the first compression process.

[0016] Figure 5 (a) and (b) are diagrams illustrating variations of the first compression process.

[0017] Figure 6 Figures (a) to (f) are variations illustrating the forming process of the connecting part. Detailed Implementation

[0018] [Implementation Method]

[0019] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0020] Figure 1 This diagram illustrates the terminal connection structure 1 of the communication cable according to this embodiment. (a) is a side view, (b) is a top view, and (c) is a cross-sectional view along line AA of (b). Figure 1 As shown in (a) to (c), the terminal connection structure 1 of the communication cable is a structure that connects the terminal of the communication cable 2 to the substrate 3.

[0021] (Communication cable 2)

[0022] Communication cable 2 is a differential signal transmission cable for transmitting differential signals, such as for transmitting high-speed signals exceeding tens of Gbit / s.

[0023] The communication cable 2 has a pair of conductors 21 arranged in parallel, an insulator 22 covering the pair of conductors 21, a shielding layer 23 covering the insulator 22, and a sheathing layer 24 covering the shielding layer 23.

[0024] A pair of conductors 21 may be composed of single conductors made of silver-plated soft copper wire. The positive side signal (positive signal) of the differential signal is transmitted to one conductor 21, and the negative side signal (negative signal) of the differential signal is transmitted to the other conductor 21. Alternatively, a pair of conductors 21 may be composed of compressed stranded conductors formed by twisting multiple metal wires together and compressing them in a circular cross-sectional shape.

[0025] As the insulator 22, for example, an insulator made of foamed polyethylene can be used. The cross-sectional shape (the cross-sectional shape perpendicular to the length direction) of the insulator 22 is approximately elliptical. A pair of conductors 21 are arranged in a manner that runs along the long axis of the insulator 22. To cope with the transmission of high-speed signals exceeding tens of Gbit / s, the spacing between the pair of conductors 21 is set to be relatively narrow. The spacing between the pair of conductors 21 is, for example, 0.2 mm or more and 0.5 mm or less. Regarding the outer diameter of the cable, for example, the length of the major axis of the approximately elliptical shape is 1.0 mm or more and 2.5 mm or less, and the length of the minor axis is 0.5 mm or more and 1.2 mm or less.

[0026] The shielding layer 23 is, for example, made of sheet-like copper foil. The shielding layer 23 is formed by longitudinally winding the copper foil. The sheath layer 24 is, for example, formed of a resin composition primarily composed of heat-resistant PVC (vinyl chloride). The communication cable 2 does not include a grounding wire for the shielding layer 23. The termination process of the communication cable 2 will be described later.

[0027] (Substrate 3)

[0028] The substrate 3 is, for example, the internal substrate of a connector that connects to communication equipment. The substrate 3 is made of an insulating material such as epoxy resin and is formed into a plate shape.

[0029] Multiple signal electrodes 31 electrically connected to the conductors 21 of the communication cables 2 are respectively provided on the surface and back of the substrate 3. In the example shown, four communication cables 2 are connected to the surface and back of the substrate 3 respectively. Therefore, four pairs of signal electrodes 31 are provided on the surface and back of the substrate 3 respectively.

[0030] Additionally, a grounding electrode 32 electrically connected to the shielding layer 23 of the communication cable 2 is provided on both the surface and back of the substrate 3. The shielding layers 23 of the four communication cables 2 connected to the surface of the substrate 3 are connected to a common grounding electrode 32. Similarly, the shielding layers 23 of the four communication cables 2 connected to the back of the substrate 3 are connected to a common grounding electrode 32. The grounding electrode 32 is provided on the substrate 3 on the extension side of the communication cable 2 closer to the signal electrode 31, and is provided along the end of the substrate 3.

[0031] Furthermore, the number of communication cables 2 connected to the substrate 3 is not limited to the example shown in the figure. Alternatively, the communication cables 2 may be connected only to either the front or back side of the substrate 3.

[0032] (Terminal processing of communication cable 2, connection of communication cable 2 to substrate 3)

[0033] The communication cable 2 has a conductor exposure portion 2a that exposes a pair of conductors 21 of a predetermined length from the end of the insulator 22. In addition, at the end of the communication cable 2, on the base end side of the conductor exposure portion 2a, a sheath layer 24 of a predetermined length is removed to expose the shielding layer 23.

[0034] The conductor 21 in the exposed conductor portion 2a has a connecting portion 211 formed such that its width a in the direction of arrangement of the pair of conductors 21 (the direction of the long axis of the insulator 22) is smaller than its height b in the direction perpendicular to the direction of arrangement and the length direction of the conductors 21 (the direction of the short axis of the insulator 22). The connecting portions 211 are formed at the ends (front ends) of the pair of conductors 21 in the exposed conductor portion 2a. The width a of the connecting portion 211 is at least smaller than the diameter of the conductor 21 before forming (the diameter of the conductor 21 in the part with a circular cross-section). Furthermore, the spacing d between the connecting portions 211 of the pair of conductors 21 (the spacing along the width direction) is larger than the spacing D of the pair of conductors 21 in the covering portion 2b where the conductors 21 are covered by the insulator 22.

[0035] With this configuration, even when using a communication cable 2 with a narrow spacing D between conductors 21, the spacing d between conductors 21 (connection portions 211) at the connection point with the substrate 3 can be increased. As a result, the spacing between the signal electrodes 31 of the substrate 3 connecting the conductors 21 can also be increased, making brazing and soldering operations easier. Furthermore, by increasing the spacing between conductors 21 and signal electrodes 31, extreme impedance reduction at the connection point between the communication cable 2 and the substrate 3 (i.e., the connection point between conductors 21 and signal electrodes 31) can be suppressed, thereby preventing signal quality degradation.

[0036] The term "width" in the following context refers to the orientation of a pair of conductors 21 (the direction of the major axis of the insulator 22). Figure 1 The dimension in the left-right direction of (c). Furthermore, the orientation of the pair of conductors 21 is referred to as the "width direction". And, the term "height" refers to the direction perpendicular to both the width direction and the length direction of the conductors 21 (the direction of the minor axis of the insulator 22, ...). Figure 1 The dimension in the vertical direction of (c). In addition, the direction perpendicular to the width direction and the length direction of conductor 21 is called the "height direction".

[0037] The height b of the connection portion 211 can be more than 1.5 times and less than 2.0 times the width a. By setting the height b of the connection portion 211 to more than 1.5 times the width a, the spacing between the conductors 21 (the connection portions 211) can be sufficiently increased, making connection operations easier and suppressing signal quality degradation caused by impedance reduction. By setting the height b of the connection portion 211 to less than 2.0 times the width a, the reduction in connection strength to the signal electrode 31 caused by the connection portion 211 becoming too high or too narrow can be suppressed.

[0038] Furthermore, the portion of the connecting part 211 that contacts the signal electrode 31 is flat. Here, the connecting part 211 is configured with a cross-sectional shape that is approximately rectangular.

[0039] With this configuration, the connecting part 211 is in surface contact with the signal electrode 31, thus enabling a stable connection between the connecting part 211 and the signal electrode 31 based on welding or the like. In addition, the connection strength between the connecting part 211 and the signal electrode 31 can also be improved.

[0040] The conductor 21 exposed at the conductor exposure portion 2a has a bend 212 at the base end side of the connection portion 211, which bends the conductor 21 into a crank shape such that the conductor 21 approaches the substrate 3 (see reference). Figure 1 (a)). In addition, the curved part 212 is not necessary and can be omitted.

[0041] In this embodiment, the connection portions 211 of a pair of conductors 21 are respectively connected to the signal electrode 31 by soldering with solder 4. However, it is not limited to this; the connection portions 211 of a pair of conductors 21 can also be connected to the signal electrode 31 by soldering. Furthermore, for the sake of simplifying the drawings, in... Figure 1 In (a) and (b), solder 4 is omitted. Similarly, the shielding layer 23 is connected to the grounding electrode 32 by brazing or welding.

[0042] In this embodiment, the cross-sectional shape of the conductor 21 is approximately rectangular, thus reducing the bulging of the solder 4 in the width direction compared to the case where it is brazed to a conductor with a circular cross-section and the same cross-sectional area.

[0043] Furthermore, in this embodiment, since the width a of the connection portion 211 can be reduced, the width of the signal electrode 31 can also be reduced accordingly. As a result, the spacing of the signal electrodes 31 can be further increased. More specifically, the spacing of the signal electrodes 31 can be more than 1.01 times and less than 1.30 times the spacing D of the conductors 21.

[0044] (Termination connection method for communication cables)

[0045] Figure 2(a) is a flowchart showing the sequence of the communication cable terminal connection method of this embodiment.

[0046] like Figure 2 As shown in (a), first, the conductor exposure process of step S1 is performed. In the conductor exposure process, in the communication cable 2, a pair of conductors 21 of a predetermined length are exposed from the ends of the insulator 22 to form a conductor exposure portion 2a. In addition, the shielding layer 23 is exposed except for the sheath layer 24 on the base end side of the conductor exposure portion 2a.

[0047] Next, the connection part forming process of step S2 is performed. In the connection part forming process, the ends of a pair of conductors 21 exposed in the conductor exposed part 2a are formed to form a connection part 211 in such a way that the width a of the pair of conductors 21 is smaller than the height b, and the spacing d between the connection parts 211 is larger than the spacing D of a pair of conductors 21 in the covering part 2b where the conductors 21 are covered by the insulator 22.

[0048] More specifically, such as Figure 2 As shown in (b), firstly, the first compression step of step S21 is performed. In the first compression step, as... Figure 3 As shown in (a), a pair of conductors 21 are compressed in the width direction (the arrangement direction of conductors 21). During the first compression process, as... Figure 4 As shown in (a) to (c), a plate-shaped spacer 5 can be inserted between a pair of conductors 21 to increase the spacing between the conductors 21, in which the conductors 21 are compressed in the width direction.

[0049] After the first compression step in step S21, the second compression step in step S22 is performed. In the second compression step, as... Figure 3 As shown in (b), a pair of conductors 21 are compressed in the height direction. Before the second compression process, i.e. after the first compression process, the upper and lower surfaces in the height direction become curved (see reference). Figure 3 (a) However, by performing the second compression process, the upper and lower surfaces in the height direction become planes, and the cross-sectional shape of the connecting part 211 becomes approximately rectangular. That is, by performing the second compression process, the connecting part 211 is formed in such a way that the part in contact with the signal electrode 31 becomes a plane.

[0050] After the second compression step in step S22, the third compression step in step S23 is performed. In the third compression step, as... Figure 3 As shown in (c), the pair of conductors 21 are further compressed in the height direction. Thus, the connection 211 is shaped such that the width a is smaller than the height b. Then, it returns to its previous state and enters... Figure 2 Step S3 of (a).

[0051] Furthermore, the second compression step in step S22 and the third compression step in step S23 can be omitted. However, in this case, the surface of the connecting part 211 that connects to the signal electrode 31 becomes a curved surface, making it difficult to maintain a stable posture when connecting the connecting part 211 to the signal electrode 31 by brazing or the like, making the connection operation difficult and potentially reducing the connection strength. Therefore, it is preferable to perform the second compression step in step S22 and the third compression step in step S23. In addition, by reducing the compression amount in the second compression step, the third compression step can also be omitted.

[0052] In step S3, a connection process is performed. In this process, the connection portions 211 of a pair of conductors 21 are connected to the signal electrodes 31 of the substrate 3 by brazing. Additionally, the shielding layer 23 of the communication cable 2 is connected to the ground electrode 32 of the substrate 3 by brazing. Figure 2 Connect each communication cable 2 to the substrate 3 in the order of (a) to obtain Figure 1 1. Terminal connection construction of communication cables (a) to (c).

[0053] In addition, Figure 2 In (a), the formation of the bend 212 in the conductor 21 is not mentioned. However, when the bend 212 is formed, the process of forming the bend 212 can be inserted between the conductor exposure process in step S1 and the connection forming process in step S2, or between the connection forming process in step S2 and the connection process in step S3.

[0054] (Modified example)

[0055] When the conductor 21 is made of compressed stranded conductor, in order to prevent the metal wire from spreading out during the compression process of the connection forming process, a pre-soldering process can be performed by attaching solder to the front end of the conductor 21.

[0056] Furthermore, in the case where conductor 21 is made of compressed stranded conductor, such as Figure 5 As shown in (a), (b), and [the diagram], the first compression step can be performed by compressing a pair of conductors 21 in the height direction and then rotating the compressed portion by 90°. Therefore, the spacer 5 (see [reference]) can be omitted. Figure 4 (b)). In addition, by reducing the compression amount of the second compression step and omitting the third compression step, the mechanism for compression in the width direction can be omitted.

[0057] Furthermore, in this case, during the first compression step, it is preferable to rotate the compression section in the direction of the twisting of the compressed stranded conductors. This prevents the stranding of the metal wire from unwinding at the connection 211. In the examples of Figures 5(a) and (b), since the pair of conductors 21 are rotated in opposite directions, the twisting directions of the pair of conductors 21 can also be opposite. Alternatively, if the twisting directions of the pair of conductors 21 are set to the same direction, they can be rotated in the same direction during the first compression step.

[0058] Moreover, such as Figure 6 As shown in (a) to (f), the connecting part 211 can also be formed using a dedicated metal mold 6. Figure 6 The metal mold 6 shown in (a) to (f) includes a lower metal mold 61, a pair of horizontal metal molds 62 movably mounted on the lower metal mold 61, a first upper metal mold 63, and a second upper metal mold 64. Hereinafter, Figure 6 In (a) to (f), the upper side is called the upper side, and the lower side is called the lower side.

[0059] The lower metal mold 61 has a partition wall 611 protruding upward from its upper surface. This partition wall 611 is inserted between a pair of conductors 21. A horizontal metal mold 62 is configured such that the conductors 21 are sandwiched between the partition wall 611 and the horizontal metal mold 62. The surface of the horizontal metal mold 62 opposite to the partition wall 611 is an inclined surface 621 that slopes downwards and away from the partition wall 611. The first upper metal mold 63 integrally has a plate-shaped central portion 631 and a pair of sidewalls 632 extending downwards from both ends of the central portion 631. An inclined surface 633 corresponding to the inclined surface 621 of the horizontal metal mold 62 is formed on the inner surface of the sidewalls 632. Furthermore, the second upper metal mold 64 is formed in a plate shape and has a pair of protrusions 641 protruding downwards from its lower surface. The protrusions 641 are used to compress the conductors 21 in the height direction.

[0060] like Figure 6 As shown in (a) to (b), firstly, a pair of conductors 21 are arranged on the lower metal mold 61 in such a way that they sandwich the partition wall 611 of the lower metal mold 61, and horizontal metal molds 62 are arranged on both sides of the conductors 21. Then, as Figure 6 As shown in (c) to (d), the first upper metal mold 63 is moved downwards by clamping two horizontal metal molds 62 (horizontal metal molds 62, conductor 21, and partition wall 611) between the sidewalls 632. At this time, the inclined surfaces 621 and 633 slide against each other, pressing the horizontal metal molds 62 toward the partition wall 611, and the conductor 21 is compressed in the width direction (first compression step). Afterwards, as... Figure 6As shown in (e) to (f), the first upper metal mold 63 is retracted, and the second upper metal mold 64 moves downward. At this time, the conductor 21, which is sandwiched between the horizontal metal mold 62 and the partition wall 611, is pressed downward by the protrusion 641, and the conductor 21 is compressed in the height direction (second compression step). As a result, the connecting part 211 is formed. When using the metal mold 6, since the conductor 21 is compressed in the height direction while being sandwiched between the horizontal metal mold 62 and the partition wall 611, it is possible to suppress the conductor 21 from expanding in the width direction due to this compression. Therefore, the third compression step of recompressing the conductor 21 in the width direction can be omitted.

[0061] (The role and effect of the implementation method)

[0062] As described above, in the terminal connection structure 1 of the communication cable of this embodiment, the exposed pair of conductors 21 have a connection portion 211 at their ends in such a way that the width a of the pair of conductors 21 is smaller than the height b, and the distance between the connection portions 211 of the pair of conductors 21 is larger than the distance between the pair of conductors 21 in the covering portion 2b of the conductors 21 covered by the insulator 22.

[0063] This configuration allows for an increase in the spacing between the connection portions 211 and the signal electrodes 31, making it easier to connect the conductors 21 and the signal electrodes 31 using methods such as soldering. Furthermore, by increasing the spacing between the connection portions 211 and the signal electrodes 31, impedance reduction and signal quality degradation can be suppressed.

[0064] (Summary of implementation methods)

[0065] Next, the technical ideas learned from the embodiments described above will be described by reference to the accompanying reference numerals and the like. However, the reference numerals and the like in the following description do not limit the constituent elements within the scope of patent protection to the components specifically shown in the embodiments.

[0066] [1] A terminal connection structure (1) for a communication cable connects the terminal of a communication cable (2) to a substrate (3), wherein the communication cable (2) has a pair of conductors (21) arranged in parallel and an insulator (22) covering the periphery of the pair of conductors (21), the substrate (3) has signal electrodes (31) electrically connected to the conductors (21), and the communication cable (2) has a conductor exposure portion (2a) that exposes a predetermined length of the pair of conductors (21) from the end of the insulator (22). The conductor (21) in the exposed portion (2a) has a connecting portion (211) at its end in such a way that the width in the arrangement direction of the pair of conductors (21) is smaller than the height in the direction perpendicular to the arrangement direction and the length direction of the conductor (21). The spacing between the connecting portions (211) is larger than the spacing between the pair of conductors (21) in the covering portion (2b) where the conductors (21) are covered by the insulator (22). The connecting portions (211) are connected to the signal electrode (31) by brazing or welding.

[0067] [2] According to the terminal connection structure (1) of the communication cable described in [1], the height of the connection part (211) is more than 1.5 times and less than 2.0 times the width.

[0068] [3] According to the terminal connection structure (1) of the communication cable described in [1], the connection part (211) is formed in such a way that the part in contact with the signal electrode (31) is planar.

[0069] [4] According to the terminal connection structure (1) of the communication cable described in [1], the interval between the signal electrodes (31) connecting the pair of conductors (21) is more than 1.01 times and less than 1.30 times the interval between the pair of conductors (21) in the cover portion (2b) covered by the insulator (22).

[0070] [5] According to the terminal connection structure (1) of the communication cable described in [1], the conductor (21) is composed of a compressed stranded conductor, which is formed by twisting and compressing multiple metal wires into a circular cross-section.

[0071] [6] A method for terminating a communication cable, wherein the terminal of a communication cable (2) is connected to a substrate (3), wherein the communication cable (2) has a pair of conductors (21) arranged in parallel and an insulator (22) covering the periphery of the pair of conductors (21), and the substrate (3) has a signal electrode (31) electrically connected to the conductors (21), the method for terminating the cable having the following steps: a conductor exposure step, wherein in the communication cable (2), a predetermined length of the pair of conductors (21) is exposed from the end of the insulator (22) to form a conductor exposure portion (2a); connecting In the connection forming process, the end of the conductor (21) in the exposed conductor portion (2a) is formed such that the width in the arrangement direction of the pair of conductors (21) is smaller than the height in the direction perpendicular to the arrangement direction and the length direction of the conductor (21) to form a connection portion (211), and the spacing between the connection portions (211) is larger than the spacing between the pair of conductors (21) in the covering portion (2b) where the conductors (21) are covered by the insulator (22); and in the connection process, the connection portions (211) are connected to the signal electrode (31) by brazing or welding.

[0072] [7] According to the communication cable terminal connection method described in [6], the connection forming process includes: a first compression process, in which the pair of conductors (21) are compressed in the arrangement direction; and a second compression process, after the first compression process, in which the pair of conductors (21) are compressed in a direction perpendicular to the arrangement direction and the length direction.

[0073] [8] According to the communication cable terminal connection method described in [7], the connection forming process further includes a third compression process after the second compression process, in which the pair of conductors (21) are further compressed in the arrangement direction.

[0074] [9] According to the communication cable terminal connection method described in [6], the conductor (21) is composed of a compressed stranded conductor, which is formed by twisting and compressing multiple metal wires into a circular cross-section, and the connection forming process has a first compression process of rotating the compressed part by 90° after compressing the pair of conductors (21) in the height direction.

[0075]

[10] According to the communication cable termination connection method described in [9], in the first compression step, the compression part is rotated in the direction of the twisting and fastening of the compression stranded conductor.

[0076] (Postscript)

[0077] The embodiments of the present invention have been described above, but the embodiments described above do not limit the scope of the invention to which patent protection is claimed. Furthermore, it should be noted that the combinations of features described in the embodiments are not necessarily all necessary means to solve the problems of the invention. In addition, the present invention can be implemented with appropriate modifications without departing from its spirit.

[0078] Explanation of reference numerals in the attached figures

[0079] 1. Terminal connection structure of communication cable

[0080] 2 Communication Cables

[0081] 2a Exposed part of conductor

[0082] 2b Covering Part

[0083] 21 conductors

[0084] 211 Connecting part

[0085] 22 Insulators

[0086] 23 shielding layers

[0087] 24-layer sheath

[0088] 3 substrate

[0089] 31 signal electrodes

[0090] 32 grounding electrodes

[0091] 4. Solder.

Claims

1. A terminal connection structure for a communication cable, which connects the terminal of the communication cable to a substrate, characterized in that, The communication cable has a pair of conductors arranged in parallel and an insulator covering the area around the pair of conductors. The substrate has signal electrodes that are electrically connected to the conductor. The communication cable has a conductor exposure portion that exposes the pair of conductors of a predetermined length from the ends of the insulator. The conductor in the exposed conductor portion has a connecting portion formed such that its width in the arrangement direction of the pair of conductors is smaller than its height in a direction perpendicular to both the arrangement direction and the length direction of the conductors. The spacing between the connecting portions is greater than the spacing between the pair of conductors in the covering portion where the conductor is covered by the insulator. The connecting portion is connected to the signal electrode by brazing or welding.

2. The terminal connection structure of the communication cable according to claim 1, characterized in that, The height of the connecting portion is more than 1.5 times and less than 2.0 times the width.

3. The terminal connection structure of the communication cable according to claim 1, characterized in that, The connecting portion is shaped such that the part in contact with the signal electrode is planar.

4. The terminal connection structure of the communication cable according to claim 1, characterized in that, The spacing between the signal electrodes connecting the pair of conductors is more than 1.01 times and less than 1.30 times the spacing between the pair of conductors in the cover portion covered by the insulator.

5. The terminal connection structure of the communication cable according to claim 1, characterized in that, The conductor is composed of a compressed stranded conductor, which is formed by twisting and compressing multiple metal wires into a circular cross-section.

6. A method for terminating a communication cable, comprising connecting the terminal of the communication cable to a substrate, characterized in that, The communication cable has a pair of conductors arranged in parallel and an insulator covering the area around the pair of conductors. The substrate has signal electrodes that are electrically connected to the conductor. The terminal connection method includes the following steps: In the conductor exposure process, in the communication cable, a predetermined length of the pair of conductors is exposed from the end of the insulator to form a conductor exposure portion; In the connection forming process, the end of the conductor in the exposed conductor portion is formed such that the width in the arrangement direction of the pair of conductors is smaller than the height in the direction perpendicular to both the arrangement direction and the length direction of the conductors, thus forming a connection portion. Furthermore, the spacing between the connection portions is larger than the spacing between the pair of conductors in the covering portion where the conductors are covered by the insulator. The connection process involves connecting the connection parts to the signal electrodes via brazing or welding.

7. The method for terminating a communication cable according to claim 6, characterized in that, The forming process of the connecting part includes: The first compression step involves compressing the pair of conductors in the alignment direction; and The second compression step, following the first compression step, involves compressing the pair of conductors in a direction perpendicular to both the arrangement direction and the length direction.

8. The method for terminating a communication cable according to claim 7, characterized in that, The forming process of the connecting part further includes a third compression process after the second compression process, in which the pair of conductors are further compressed in the arrangement direction.

9. The method for terminating a communication cable according to claim 6, characterized in that, The conductor is composed of a compressed stranded conductor, which is formed by twisting and compressing multiple metal wires into a circular cross-sectional shape. The forming process of the connecting part includes a first compression step of rotating the compressed part by 90° after compressing the pair of conductors in the height direction.

10. The method for terminating a communication cable according to claim 9, characterized in that, In the first compression process, the compression part is rotated in the direction of the twisting and fastening of the compressed stranded conductor.

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