JP2009176742A - Cable and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cable capable of preventing the displacement of a mutual positioning relation between a pair of wires and a shield of a cable to a long side direction of the cable. <P>SOLUTION: The cable 31 provided with a pair of wires 61a, 61b formed by applying an insulation coating 65 on a conductive wire 64, and a shield 62 surrounding the pair of the wires 61a, 61b, and furthermore, has an adhesive layer 36 for fixing the shield 62 and the wires 61a, 61b in the shield 62. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a cable mainly configured by surrounding a pair of electric wires with a shield, and in particular, matching impedance and reducing occurrence of crosstalk when a differential signal is transmitted by a pair of electric wires. The present invention relates to a cable that can be easily realized and a manufacturing method thereof.

  Conventionally, a cable in which a pair of electric wires are surrounded by a shield is used as a cable for transmitting signals at high speed. As shown in FIG. 10, the cable 60 has a shield 62 as a shield 62 and a pair of electric wires 61a and 61b mainly configured by applying an insulation coating 65 to a conductor wire 64 and a drain wire 66 as a ground wire. It has a structure in which the tape 68 is wound and bundled together (see Patent Document 1).

  In general, when such a cable 60 is used, a terminal connector is attached to a terminal portion of the cable 60. As shown in FIGS. 11A and 11B, the terminal connector 71 includes a housing 73 in which a cable 60 is inserted at one end and a plug 72 is provided at the other end, and a cable 60 provided in the housing 73. And a built-in substrate 74 that electrically connects the plug 72.

  Each of the pair of electric wires 61a and 61b exposed by peeling off the shield tape 68 and the drain wire 66 are joined to the built-in substrate 74 by soldering or the like (see FIG. 11A). At this time, the shield is provided so that a short circuit does not occur between the electric wires 61a and 61b and the ground, and when a differential signal is transmitted by the pair of electric wires 61a and 61b, an imbalance of the differential signal does not occur. The positional relationship between the tape 68 and each of the exposed pair of electric wires 61a and 61b is appropriately adjusted.

JP 2001-283649 A

  However, since the cable 60 has a structure in which the shield tape 68 is simply wound around the electric wires 61a and 61b, the longitudinal direction (axial direction) between the electric wires 61a and 61b and the shield 62 when the cable is bent or twisted. ) Will be misaligned.

  Such positional misalignment between the components of the cable 60 (shield tape 68, electric wire 61a and electric wire 61b, drain wire 66, etc.) deforms the shape of the joint portion (assembly portion) between the cable 60 and the terminal connector 71. As a result, the electrical performance of the cable 60 is degraded.

  Hereinafter, based on FIGS. 12 (a) to 12 (d), a specific example of deterioration in electrical performance that may occur when the positional relationship between each of the pair of electric wires 61a and 61b and the shield tape 68 is shifted will be described. . FIG. 12A shows an initial state in which each of the pair of electric wires 61a and 61b and the shield tape 68 are in an appropriate positional relationship.

  As shown in FIG. 12 (b), when the shield tape 68 moves in a direction to reduce the exposed length of the electric wires 61a and 61b (a direction from the upper left to the lower right in FIG. 12 (b)), the electric wire 61a 61b, a drop in impedance, an increase in the occurrence of crosstalk, and the like may occur. Further, as shown in FIG. 12C, when the electric wires 61a and 61b are relatively moved in the longitudinal direction of the cable, the electric wires 61b may be short-circuited. Also, as shown in FIG. 12D, when the shield tape 68 moves in a direction that increases the exposed length of the electric wires 61a and 61b (a direction from the lower right to the upper left in FIG. 12D), the impedance There is a risk that an increase in the number of crosstalk and an increase in the occurrence of crosstalk may occur.

  Then, the objective of this invention is providing the cable which can solve the said subject, and can prevent the shift | offset | difference of the mutual positional relationship with respect to the longitudinal direction of a pair of electric wire of a cable, and a shield, and its manufacturing method. .

  In order to achieve the above object, the present invention provides a cable comprising a pair of electric wires formed by applying an insulating coating to conductor wires, and a shield that surrounds the pair of electric wires. An adhesive layer for fixing the electric wire is provided.

  Preferably, the apparatus includes a drain wire surrounded by the shield and disposed adjacent to each of the pair of electric wires, and the adhesive layer includes an inner wall surface of the shield and at least one surface of the pair of electric wires. These are provided in any one or any combination of the surfaces of the drain lines.

  Preferably, the adhesive layer is formed from a heat-adhesive material that generates adhesiveness upon heating.

  Further, according to the present invention, an intervention made of a low dielectric constant material is provided in a gap defined by the pair of electric wires and the shield.

  Furthermore, in the present invention, the interposition has the same shape as the drain line.

  Furthermore, in the present invention, an adhesive layer is provided on the surface of the interposition.

  The present invention also provides a metal shield comprising a step of providing a pressure-sensitive adhesive layer made of a heat-adhesive material on the surface of a drain wire, and a pair of electric wires formed by applying an insulating coating to the conductor wire. A cable manufacturing method comprising: a step of winding with a tape; and a step of heating to a predetermined temperature to generate an adhesive force on the adhesive layer.

  ADVANTAGE OF THE INVENTION According to this invention, the outstanding effect that the shift | offset | difference of the mutual positional relationship with respect to the longitudinal direction of a pair of electric wire of a cable and a shield can be prevented is exhibited.

(A) shows side sectional drawing of the cable by 1st embodiment which concerns on this invention, (b) shows the top view of the cable of Fig.1 (a). (A) shows a front view of the comb-like jig of the first embodiment, (b) shows a front sectional view of the cable body of the first embodiment, and (c) shows the first embodiment. The state which pinched | interposed the cable main body with the comb-shaped jig | tool is shown. (A) shows the front view of the comb-shaped jig | tool by other embodiment which concerns on this invention, (b) shows front sectional drawing of the cable main body of other embodiment, (c) is other embodiment. The state which pinched | interposed the cable main body with this comb-tooth shaped jig | tool is shown. (A) shows the side sectional view of the cable by other embodiments concerning the present invention, and (b) shows the front view of the cable of Drawing 4 (a). The front view of the state which pinched | interposed the cable main body with the comb-shaped jig | tool of other embodiment is shown. The front sectional view of the lump shield cable using the cable by a second embodiment concerning the present invention is shown. The front sectional view of the cable by a second embodiment concerning the present invention is shown. (A) shows a front sectional view of a cable according to another embodiment, (b) shows a front sectional view of a cable according to still another embodiment, and (c) shows a front sectional view of the cable according to still another embodiment. Indicates. (A) shows a front sectional view of a cable according to another embodiment, (b) shows a front sectional view of a cable according to still another embodiment, and (c) shows a front sectional view of the cable according to still another embodiment. Indicates. The front sectional view of the conventional cable is shown. (A) shows side sectional drawing of the conventional terminal connector, (b) shows the top view of the conventional terminal connector. It is a perspective view which shows the positional relationship of the shield tape and a pair of electric wire in the terminal part of a cable conventionally, (a) shows the state in an appropriate positional relationship, (b) shows an electric wire in a shield tape. (C) shows a state where one of a pair of electric wires is excessively exposed from the shield tape and the other is buried in the shield tape, and (d) shows an excessively exposed electric wire from the shield tape. Shows the state.

  Hereinafter, a preferred embodiment of the present invention (hereinafter referred to as a first embodiment) will be described in detail with reference to the accompanying drawings.

  Fig.1 (a) shows side sectional drawing of the schematic structure of the cable of 1st embodiment, FIG.1 (b) shows the top view of the schematic structure of the cable of 1st embodiment. 2A shows a front view of the comb-like jig of the first embodiment, FIG. 2B shows a front sectional view of the cable body of the first embodiment, and FIG. ) Shows a state where the comb-like jig is attached to the cable body. In FIG. 1A, FIG. 1B, and FIG. 2A to FIG. 2C, the same elements as those shown in FIG. 10 and FIG.

  First, the schematic structure of the cable of the first embodiment will be described with reference to FIGS. 1 (a) and 1 (b).

  As shown in FIGS. 1A and 1B, the cable 1 according to the first embodiment includes a cable main body 60 and a terminal connector 71 attached to a terminal portion of the cable main body 60. In the first embodiment, the cable 1 includes a plurality of cable main bodies 60 and a common terminal connector 71 attached to the terminal portions of the cable main bodies 60 (see FIG. 1B).

  The cable body 60 of the first embodiment will be described based on FIGS. 1 (a), 2 (b), and 10. FIG. In addition, the cable main body 60 of 1st embodiment has the same schematic structure as the conventional cable 60 shown in FIG.

  As shown in FIG. 10, the cable body 60 includes a pair of electric wires 61 a and 61 b formed by applying an insulating coating 65 to the conductor wire 64, and a shield 62 surrounding the pair of electric wires 61 a and 61 b. Furthermore, the cable main body 60 of the first embodiment includes a drain wire 66 that is surrounded by a shield 62 and arranged in proximity to the pair of electric wires 61a and 61b.

  The pair of electric wires 61 a and 61 b are disposed adjacent to each other in the shield 62. The pair of electric wires 61a and 61b have the same shape. For example, the silver plating layer 4 is formed on the outer periphery of the conductor wire 64 formed of a metal such as copper, and the outer periphery of the silver plating layer 4 is insulated. It is formed by covering with a body (dielectric) (that is, by applying an insulating coating 65).

  The shield 62 is a shield tape 68 that is wound around the electric wires 61a and 61b and the drain wire 66 and bundles and shields the electric wires 61a and 61b and the drain wire 66 integrally. The shield tape 68 is a metal shield tape made of a metal such as copper, for example, and is wound around the electric wires 61 a and 61 b and the drain wire 66.

  The drain line 66 is disposed in contact with the shield tape 68 and each of the pair of wires 61 a and 61 b in a gap defined by the wires 61 a and 61 b and the shield tape 68. The drain wire 66 is a ground wire having a smaller diameter than the electric wires 61a and 61b.

  Thus, the cable main body 60 comprised by the symmetrical structure is arranged as shown in FIG.2 (b). Specifically, the cable main bodies 60 oriented so that the pair of electric wires 61a and 61b are arranged vertically are arranged in a horizontal row (so that the pair of electric wires 61a and 61b of the cable main body 60 are arranged in two upper and lower rows). Thus, the plurality of cable bodies 60 are aligned.

  In the following description, the direction in which the cable main bodies 60 are aligned is defined as the width direction (the left-right direction in FIG. 2B), and the vertical direction in which the pair of electric wires 61a and 61b are aligned is perpendicular to the width direction. 2 (b) in the vertical direction). The cable main body 60 is aligned so that the drain line 66 of each cable main body 60 is located in one of the width directions (left side in FIG. 2B).

  Furthermore, in 1st embodiment, as shown to Fig.1 (a), in the terminal part to which the terminal connector 71 of the cable main body 60 is attached, the shield tape 68 is peeled and electric wire 61a, 61b and the drain wire 66 are exposed. To do. Furthermore, the insulation coating 65 of the electric wires 61a and 61b is also peeled off, and the conductor wire 64 is exposed.

  A terminal connector 71 according to the first embodiment will be described with reference to FIGS. 1 (a) and 1 (b).

  As shown in FIGS. 1A and 1B, a terminal connector 71 has a housing 73 in which a terminal portion of a cable body 60 is inserted at one end and a plug 72 is provided at the other end (see FIG. 1A). And a built-in substrate 74 (see FIG. 1B) that is provided in the housing 73 and electrically connects the cable body 60 and the plug 72.

  The built-in board 74 includes a board body 6 to which the pair of electric wires 61a and 61b of the cable body 60 are connected, a board ground surface member 8 to which the drain wire 66 of the cable body 60 is connected, and the board body 6 and the board ground. An earth connection line 9 for connecting the surface member 8 is provided.

  The board body 6 extends from the terminal portion of the cable body 60 to the plug 72 along the longitudinal direction of the terminal connector 71 (the left-right direction in FIG. 1A). A land portion 10 is provided on the upper surface of the substrate body 6. The land portion 10 is provided over the entire length of the substrate body 6 along the longitudinal direction of the terminal connector 71. One end (for example, a plus signal line) located above the pair of electric wires 61a and 61b is soldered to the end of the land portion 10 on the cable main body 60 side (left side in FIG. 1B), and the plug The upper conductor 11 of the plug 72 is soldered to the end portion on the side (right side in FIG. 1B). Similarly, land portions 12 are provided on the lower surface of the substrate body 6 along the longitudinal direction of the terminal connector 71 over the entire length of the substrate, and the other electric wires 61b (for example, a negative signal) are provided at both ends of the land portion 12. Line) and the lower conductor 13 of the plug 72 are each soldered. A plurality of the land portions 10 and the land portions 12 are provided in the width direction for each cable body 60. In FIG. 1A, the wires 61a and 61b are three-dimensionally shown so that they can be easily distinguished from other members. However, the wires 61a and 61b actually extend straight in the longitudinal direction.

  Further, a substrate ground 14 is provided at the center of the substrate body 6 in the height direction along the longitudinal direction of the terminal connector 71 over the entire length of the substrate body 6. The ground connection line 9 is connected to the end of the substrate ground 14 on the cable body 60 side, and the ground conductor (not shown) of the plug 72 is connected to the end on the plug 72 side. Further, the substrate ground 14 is formed by being divided at the center in the longitudinal direction of the terminal connector 71.

  The board ground surface member 8 is provided behind the terminal portion of the shield tape 68 of the cable body 60 in the longitudinal direction of the terminal connector 71 (on the left side in FIG. 1A). It has a U-shaped shape straddling along. The drain wire 66 of the cable body 60 is connected to the upper surface of the substrate ground plane member 8, and the ground connection line 9 is connected to one of the outer surfaces in the width direction of the substrate ground plane member 8 (right side in FIG. 1B). Is done. That is, the drain line 66 is electrically connected to the plug 72 via the substrate ground plane member 8, the ground connection line 9, and the substrate ground 14. Further, the substrate ground plane member 8 of the first embodiment also serves as a line-fixing jig for maintaining the line-alignment state of the cable body 60.

  In particular, in the first embodiment, as shown in FIG. 2 (a), the terminal connector 71 includes a comb-like jig 15 formed of an insulator and having comb-like comb teeth 16, and the comb teeth. The cable main body 60 is sandwiched between the comb teeth 16 of the jig 15, and the pair of electric wires 61a and 61b and the shield 62 of the cable main body 60 are fixed.

  The comb-like jig 15 will be described with reference to FIGS. 1 (a), 1 (b), 2 (a) and 2 (c).

  As shown in FIGS. 1A and 1B, the comb-like jig 15 is provided in the housing 73 of the terminal connector 71. Further, the comb-shaped jig 15 is disposed behind the board ground surface member 8 in the longitudinal direction of the terminal connector 71 (on the left side in FIG. 1A). As shown in FIG. 2C, the comb-like jig 15 includes a base 18 that is provided above the cable body 60 in the height direction and extends in the width direction, and extends downward from the bottom surface of the base 18 in the height direction. And a plurality of comb teeth 16 arranged in a line in the direction.

  The base portion 18 of the first embodiment is provided in contact with the top of the straightened cable body 60 and has substantially the same width as the entire width of the plurality of straightened cable bodies 60. The base 18 is fixed to a fixing groove (not shown) cut out in the housing 73.

  The comb teeth 16 of the first embodiment are arranged on both sides of each cable body 60 in the width direction. Each comb tooth 16 extends from the upper end to the lower end of the cable body 60 in the height direction.

  In particular, in the first embodiment, the edge 19 of the comb teeth 16 of the comb-shaped jig 15 is sharply formed, and the comb teeth 16 are formed on the insulating coating 65 of the pair of electric wires 61 a and 61 b of the cable body 60. The comb-shaped jig 15 sandwiches and fixes the cable body 60 by biting into each of the shields 62.

  Specifically, the cross-section perpendicular to the height direction of the comb teeth 16 is formed in a rhombus, and the acute angle (the edge 19 in the width direction) of the rhombus is sharply formed. Further, the comb teeth 16 extend in the width direction until the edge portion 19 in the width direction reaches the inside of the insulating coating 65 of the electric wires 61a and 61b of the adjacent cable body 60. That is, with respect to each cable body 60, the edge 19 of the comb teeth 16 is shield tape from both sides in the width direction (that is, the direction perpendicular to the longitudinal direction of the cable body 60 (the front and back direction in FIG. 2C)). 68, and penetrates into the insulation coating 65 of the pair of electric wires 61a and 61b. Further, the lower portion of the comb teeth 16 is provided with a taper that becomes narrower as it goes downward, and the lower ends of the comb teeth 16 are sharpened. In the first embodiment, the lower portion of the comb teeth 16 is formed in a downward quadrangular pyramid shape.

  Next, the operation of the cable 1 of the first embodiment will be described.

  The shield tape 68 of each cable body 60 and the electric wires 61a and 61b exposed from the shield tape 68 are adjusted to a position satisfying a desired condition (for example, impedance matching). A plurality of the cable main bodies 60 are arranged and aligned. The comb-like jig 15 is inserted from above the cable body 60 into the aligned cable body 60, and the comb-like jig 15 is attached to the cable body 60. Since the lower part of the comb teeth 16 is inclined on both sides in the width direction with the lower end as the center, the comb teeth 16 are inserted vertically at predetermined positions without being displaced in the width direction. Therefore, there is no contact between the comb teeth 16 and the conductor wires 64 in a state where the comb-shaped jig 15 is inserted. Even if the comb teeth 16 come into contact with the conductor wires 64, the comb teeth 16 are formed of an insulator, and thus the conductor wires 64 are not affected at all.

  The attached comb-like jig 15 is fixed to the housing 73 of the terminal connector 71. Further, the electric wires 61 a and 61 b and the drain wire 66 of each cable body 60 are respectively soldered to the built-in substrate 74 of the terminal connector 71.

  When the cable 1 is bent or twisted, each of the electric wires 61a and 61b and the shield tape 68 tends to move relative to each other in the longitudinal direction due to a difference in elongation rate between the shield tape 68 and the electric wires 61a and 61b. To do.

  However, in the first embodiment, since the shield tape 68 and each of the pair of electric wires 61 a and 61 b are integrally fixed by the comb teeth 16, the pair of electric wires 61 a and 61 b and the shield tape 68 are connected to each other. No relative deviation occurs. Therefore, desired conditions between the shield tape 68 and the electric wires 61a and 61b at the time of assembling the cable 1 are always maintained.

  Furthermore, since the plurality of cable main bodies 60 are collectively fixed by the comb-shaped jig 15, not only the pair of electric wires 61a and 61b of each cable main body 60 but also the electric wires 61a and 61b of the plurality of cable main bodies 60 are connected to each other. There is no relative displacement between the electric wires 61a of the adjacent cable bodies 60 (for example).

  As described above, in the cable 1 of the first embodiment, the cable main body 60 is sandwiched between the comb teeth 16 of the comb-like jig 15, and the comb teeth 16 having sharp edge portions 19 are formed on the shield tape 68. And the insulation coating 65 of the electric wires 61a and 61b, so that the cable 1 is bent or twisted. Misalignment of the positional relationship can be prevented.

  Therefore, since the positional relationship between the pair of electric wires 61a and 61b and the shield tape 68 is always maintained so as to satisfy a desired condition, it is possible to prevent the electric wires 61a and 61b from being short-circuited. Furthermore, when a differential signal is transmitted by a pair of electric wires 61a and 61b, the differential signal is not unbalanced, and good electrical performance such as impedance matching and reduction in occurrence of crosstalk is ensured over a long period of time. can do.

  In addition, by fixing the plurality of cable main bodies 60 together with the comb-shaped jig 15, it is possible to prevent the longitudinal displacement between the electric wires 61 a and 61 b of the plurality of cable main bodies 60.

  Further, by fixing the comb-shaped jig 15 to the housing 73 of the terminal connector 71, the tensile force when the cable body 60 is pulled is received by the terminal connector 71 via the comb-shaped jig 15, Separation of the joint (soldered portion) between the pair of electric wires 61a and 61b and the built-in substrate 74 can be prevented.

  The present invention is not limited to the first embodiment described above, and various modifications and application examples can be considered.

  In the first embodiment, the form using the comb teeth 16 having a diamond-shaped cross section has been described. However, the shape of the comb teeth is not limited to this, and various shapes are possible.

  For example, in the embodiment shown in FIGS. 3A to 3C, the comb teeth 22 of the comb-shaped jig 21 are formed in a triangular cross section, and one corner (edge 24) of the triangle is sharpened. It is made sharp. The comb teeth 21 bite into the shield tape 68 of the cable body 60 and the pair of electric wires 61a and 61b by the edge 24.

  In order to further increase the fixing strength between the comb-shaped jig and the cable body, the comb-shaped jig and the cable body may be integrally fixed with a thermoplastic resin or an adhesive.

  Furthermore, another embodiment using a thermoplastic resin or an adhesive will be described with reference to FIGS. 4 (a) and 4 (b). 4 (a) and 4 (b), the same elements as those in FIGS. 1 (a) and 1 (b) are denoted by the same reference numerals. In the embodiment of FIG. 4, the comb-like jig 15 of the cable 25 and the cable body 60 are collectively fixed in the housing 73 of the terminal connector 71 by the thermoplastic resin 26. That is, the thermoplastic resin 26 that integrally fixes the comb-shaped jig 15 and the cable body 60 is also bonded to the inner wall surface of the housing 73. Note that an adhesive may be used instead of the thermoplastic resin 26. In the embodiment of FIG. 4 as well, the same effects as those of the first embodiment can be obtained. Further, the fixing strength between the comb-shaped jig 15 and the cable body 60 and the connection strength between the cable body 60 and the terminal connector 71 are obtained. And can be further enhanced.

  In the first embodiment, the comb-shaped jig 15 and the housing 73 of the terminal connector 71 are described as separate bodies. However, the present invention is not limited to this. For example, the comb-shaped jig 15 May be formed integrally with the housing of the terminal connector.

  Moreover, although 1st embodiment demonstrated the form which formed the edge part 19 of the comb-tooth 16 of the comb-shaped jig | tool 15 sharply, and the comb-tooth 16 bites into the cable main body 60, this invention is this. For example, using a tool such as a cutter, a groove may be cut into the shield tape of the cable main body and each of the pair of electric wires, and the comb-shaped jig may be cut into the groove. In this case, since it is not necessary to form the edge part of a comb-shaped jig | tool sharply, the manufacturing cost of a cable can be reduced.

  In the first embodiment, the shield tape 68 and the electric wires 61a and 61b are cut by the edge 19 of the comb teeth 16, and the comb teeth 16 are bitten into the cable body 60. It is not limited, For example, you may make it prevent relative movement with each of a pair of electric wire and a shield tape by inserting | pinching a shield tape and an electric wire, without cutting a shield tape and an electric wire with a comb tooth. .

  In the first embodiment, the configuration in which one comb-like jig 15 is inserted into the cable main body 60 from above the straightened cable main body 60 and attached to the cable main body 60 has been described. It is not limited to the number of tools or the direction of insertion. For example, the length of the comb teeth of the comb-shaped jig may be formed to be approximately half the height of the cable body, and the comb-shaped jig may be inserted so as to be sandwiched from above and below the cable body. . In this case, since the comb teeth of each comb-shaped jig are shortened and the force applied to the roots of the comb teeth is weakened, the strength required for the comb teeth can be reduced, and the cable manufacturing cost can be reduced. .

  Moreover, although 1st embodiment demonstrated the form which has arrange | positioned the comb-tooth 16 on the width direction both sides of each cable main body 60, this invention is not limited to this, For example, as shown in FIG. The comb teeth 16 may be arranged only on one side in the width direction of 60. In this case, since the number of comb teeth decreases, the manufacturing cost of a cable can be reduced.

  Moreover, although 1st embodiment demonstrated the form which joins the electric wires 61a and 61b, the built-in board | substrate 74, the drain wire 66, and the board | substrate earth | ground surface member 8 by soldering, respectively, For example, electric wires And the built-in substrate, and the drain wire and the substrate ground plane member may be bonded by pressure bonding.

  As mentioned above, although embodiment which prevents each gap of a pair of electric wires and a shield using a comb-like jig was explained below, an adhesion layer is provided and a gap between each of a pair of electric wires and a shield is prevented. A second embodiment according to the present invention will be described.

  A cable according to the second embodiment of the present invention will be described with reference to FIGS. 6 and 7, the same reference numerals are given to the same elements as those in FIGS. 1A, 1B, and 2A to 2C.

  The cable 31 of the second embodiment is used, for example, as a collective shield cable 35 covered with a collective shield 32 and a sheath 34, as shown in FIG.

  The cable 31 of the second embodiment has the same schematic structure as the cable body 60 of the first embodiment.

  That is, as shown in FIG. 7, the cable 31 of the second embodiment includes a pair of electric wires 61a and 61b formed by applying an insulating coating 65 to the conductor wire 64, and a shield surrounding the pair of electric wires 61a and 61b. 62.

  In particular, in the second embodiment, the adhesive layer 36 for fixing the shield 62 and the electric wires 61a and 61b is provided in the shield 62 so as to prevent the gap between the pair of electric wires 61a and 61b and the shield 62. It is characterized by.

  Further, the cable 31 of the second embodiment includes a drain wire 66 surrounded by the shield 62 and disposed in proximity to each of the pair of electric wires 61 a and 61 b, and the adhesive layer 36 is connected to the inner wall surface of the shield 62. Of at least one of the electric wires 61a and 61b and the surface of the drain wire 66, or any combination of them.

  Specifically, the adhesive layer 36 of the second embodiment is provided over the entire length of the cable 31 on the surface of the drain wire 66. In the cross section perpendicular to the longitudinal direction of the cable 31, as shown in FIG. 7, the adhesive layer 36 provided on the outer periphery of the drain wire 66 contacts a part of the inner wall surface of the shield 62 (shield tape 68). At the same time, they abut against a part of the surface of the insulation coating 65 of the pair of electric wires 61a and 61b. Furthermore, the adhesive layer 36 of the second embodiment is formed from a heat-adhesive material that generates adhesiveness when heated.

  Next, the operation of the cable 31 of the second embodiment will be described.

  Before the shield tape 68 is wound around the cable 31, the adhesive layer 36 is formed in advance on the surface of the drain wire 66 (for example, by applying a heat adhesive material). In this state, the adhesive layer 36 is not sticky and the drain line 66 is easy to handle. Thereafter, the shield tape 68 is wound around the drain wire 66 on which the adhesive layer 36 is formed and the pair of electric wires 61a and 61b. Thereafter, the cable 31 is heated to a predetermined temperature to generate an adhesive force in the adhesive layer 36 to adhere the drain wire 66 and the shield tape 68 to each other, and to connect the drain wire 66 and each of the pair of electric wires 61a and 61b. Adhere to each other.

  Even if the cable 31 of the second embodiment assembled in this way is bent or twisted, the shield tape 68 and each of the pair of electric wires 61a and 61b are fixed to each other by the adhesive layer 36. Therefore, relative displacement in the longitudinal direction between the pair of electric wires 61 a and 61 b of the cable 31 and the shield tape 68 does not occur.

  Therefore, when the terminal connector is attached to the terminal portion of the cable 31, the positional relationship between the shield tape 68 and the electric wires 61a and 61b when the terminal connector is attached is always maintained.

  Furthermore, in the second embodiment, there is no relative displacement in the longitudinal direction between the drain wire 66, the shield tape 68, and each of the pair of electric wires 61a and 61b.

  As described above, the cable 31 of the second embodiment is provided with the adhesive layer 36 on the surface of the drain wire 66 disposed adjacent to each of the pair of electric wires 61a and 61b, so that the adhesive layer 36, the shield tape 68, and Each of the pair of electric wires 61a and 61b is adhered to each other, and the positional relationship between the pair of electric wires 61a and 61b and the shield tape 68 in the longitudinal direction can be prevented.

  Therefore, since the positional relationship between the pair of electric wires 61a and 61b and the shield tape 68 can be always maintained in a desired condition, the electric wires 61a and 61b can be prevented from being short-circuited. Further, when a differential signal is transmitted by the pair of electric wires 61a and 61b, an imbalance of the differential signal does not occur, and impedance mismatching and occurrence of crosstalk can be reduced.

  Further, by forming the adhesive layer 36 from a heat-adhesive material that generates an adhesive force by heating, the handleability during assembly of the cable 31 can be improved.

  The present invention is not limited to the above-described second embodiment, and various modifications and application examples can be considered.

  For example, in the second embodiment, the form in which the adhesive layer 36 is provided over the entire length of the drain wire 66 has been described. However, the present invention is not limited to this. For example, a terminal connector such as a cable having a predetermined length is manufactured. When the attachment position is determined in advance, the adhesive layer may be provided only in the vicinity of the attachment position.

  Moreover, although 2nd embodiment demonstrated the form which provides the adhesion layer 36 on the surface of the drain line 66, the object which provides an adhesion layer is not limited to the surface of a drain line.

  Hereinafter, an embodiment in which an adhesive layer is provided on a surface other than the surface of the drain wire will be described. 8A to FIG. 8C and FIG. 9A to FIG. 9C, the same elements as those in FIG.

  The cable 41 of the embodiment of FIG. 8A is provided with an adhesive layer 36 on one surface of a pair of electric wires 61a and 61b. The cable 42 of the embodiment of FIG. 8B is obtained by providing the adhesive layer 36 on both surfaces of the pair of electric wires 61a and 61b. The cable 43 of the embodiment of FIG. 8C is obtained by providing the adhesive layer 36 on the inner wall surface of the shield tape 68. In the embodiment of FIG. 8A to FIG. 8C described above, the same effect as that of the second embodiment is obtained, and further, the adhesive surface of the adhesive layer 36 (contacts with a member such as the shield tape 68). Adhesive strength can be improved by increasing the area of the adhesive surface.

  Moreover, the adhesiveness of each component of a cable may be improved by providing several drain wires of a cable and providing the adhesion layer on the surface of those drain wires.

  Another embodiment will be described with reference to FIG. The cable 44 of the embodiment of FIG. 9A includes two drain wires 66a and 66b that are surrounded by a shield tape 68 and are disposed adjacent to each of the pair of electric wires 61a and 61b. The drain wires 66a and 66b are respectively disposed in gaps on both sides in the width direction (vertical direction in FIG. 9A) defined by the pair of electric wires 61a and 61b and the shield tape 68. An adhesive layer 36 is provided on the surfaces of the drain lines 66a and 66b.

  Further, in addition to the drain line or in place of the drain line, an interposition may be provided in the cable, and an adhesive layer may be provided on the surface of the interposition so that the components of the cable may be bonded.

  Another embodiment will be described with reference to FIG. The cable 45 of the embodiment of FIG. 9B includes a drain wire 66 and an intervening 45 that are surrounded by the shield tape 68 and disposed adjacent to each of the pair of electric wires 61a and 61b. The drain line 66 and the interposition 45 are respectively disposed in gaps on both sides in the width direction (vertical direction in FIG. 9B) defined by the pair of electric wires 61a and 61b and the shield tape 68. Adhesive layers 36 are provided on the surfaces of the drain line 66 and the interposition 45, respectively. The interposition 45 has the same shape as the drain line 66 and is made of a low dielectric constant material such as Teflon (registered trademark) or polyethylene.

  Furthermore, another embodiment will be described with reference to FIG. The cable 46 of the embodiment of FIG. 9C includes two interpositions 45a and 45b that are surrounded by the shield tape 68 and disposed adjacent to each of the pair of electric wires 61a and 61b. Adhesive layers 36 are respectively provided on the surfaces of the interpositions 45a and 45b. The interpositions 45a and 45b are respectively formed between the pair of electric wires 61a and 61b and the shielding tape in a gap on both sides in the width direction (vertical direction in FIG. 9C) defined by the pair of electric wires 61a and 61b and the shielding tape 68. 68 in contact with each other. Moreover, these interpositions 45a and 45b have the same shape as each other, and have a smaller diameter than the electric wires 61a and 61b. Further, the interpositions 45a and 45b are made of a low dielectric constant material such as Teflon (registered trademark) or polyethylene.

  9A to 9C, the same effects as those of the embodiment of FIGS. 8A to 8C can be obtained. Further, FIGS. 8A to 8 Compared to the embodiment of (c), the adhesive layer 36 has a smaller area that does not come into contact with any of the shield tape 68 and each of the pair of electric wires 61a and 61b (that is, an area that does not contribute to prevention of misalignment). Can be provided efficiently, and the manufacturing cost of the cable 31 can be further reduced.

DESCRIPTION OF SYMBOLS 1, 25, 31, 41, 42, 43, 44, 45, 46 Cable 15 Comb-shaped jig 16 Comb 19 Edge part 26 Thermoplastic resin 36 Adhesive layer 61a, 61b Electric wire 62 Shield 64 Conductor wire 65 Insulation coating 60 Cable body 66 Drain wire 71 Terminal connector 73 Housing

Claims (7)

  In a cable having a pair of electric wires formed by applying an insulating coating to conductor wires and a shield surrounding the pair of electric wires, an adhesive layer for fixing the shield and the electric wires is provided in the shield. Cable characterized by that.   A drain wire surrounded by the shield and disposed adjacent to each of the pair of electric wires, wherein the adhesive layer includes an inner wall surface of the shield, at least one surface of the pair of electric wires, and the drain The cable according to claim 1, wherein the cable is provided in any one or any combination of the surfaces of the wires.   The cable according to claim 1, wherein the adhesive layer is formed from a heat-adhesive material that generates adhesiveness upon heating.   The cable according to any one of claims 1 to 3, wherein an intervention made of a low dielectric constant material is provided in a gap defined by the pair of electric wires and the shield.   The cable according to claim 4, wherein the interposition has the same shape as the drain wire.   The cable according to claim 4 or 5, wherein an adhesive layer is provided on the surface of the interposition. Providing an adhesive layer made of a heat-adhesive material on the surface of the drain wire;
Winding the drain wire and a pair of electric wires formed by applying an insulating coating to the conductor wire with a shield tape made of metal;
Heating to a predetermined temperature to generate an adhesive force in the adhesive layer,
The manufacturing method of the cable provided with.

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