Terminal for differential communication, conducting path for differential communication, and connector for differential communication

Abstract

To reduce the untwisting length of a core wire forming a cable for differential communication.SOLUTION: Each of insulation barrel parts 45L, 45R has a bottom plate part 46 curved in a minor arc shape, and crimping pieces 47L, 47R, 48L, 48R extending obliquely upward in a tangential shape from both ends in a circumferential direction of the bottom plate part 46. In a state in which the pair of insulation barrel parts 45L, 45R are arranged in parallel and separated in the left and right direction, when two crimping pieces at the most separated positions in the parallel direction, of the four crimping pieces 47L, 47R, 48L, 48R, are defined as outer crimping pieces 47L, 47R, and two crimping pieces at the closest positions in the parallel direction are defined as inner crimping pieces 48L, 48R, the pair of insulation barrel parts 45L, 45R have a form in which in the parallel direction, the maximum distance N between the axial center C of the core wire 22 and the tip of the inner crimping piece 48L, or between the axial center C of the core wire and the tip of the inner crimping piece 48R is made smaller than the maximum distance W between the axial center C of the core wire 22 and tip of the outer crimping piece 47L, or between the axis C of the core wire and the tip of the outer crimping piece 47R.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present disclosure relates to a differential communication terminal, a differential communication conductive path, and a differential communication connector. [Background technology]

[0002] Patent Document 1 discloses a terminal fitting having an open-barrel shaped insulating coating crimping portion. The insulating coating crimping portion has an insulating coating crimping bottom wall portion and a pair of insulating coating crimping upright walls extending from both side edges of the insulating coating crimping bottom wall portion. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2014-160591 A Summary of the Invention [Problem to be solved by the invention]

[0004] This terminal fitting can be crimped to two core wires constituting a twisted pair wire of a differential communication cable. In this case, it is preferable to shorten the untwisted length of the two core wires in order to suppress a decrease in communication performance. However, when two insulation coating crimping parts are crimped simultaneously to two parallel-arranged core wires, shortening the untwisted length of the two core wires narrows the parallel spacing of the core wires, causing interference between the insulation coating crimped standing wall parts located on the inside in the parallel direction. In order to avoid interference between the insulation coating crimped standing wall parts, it is necessary to lengthen the untwisted length of the two core wires.

[0005] The differential communication terminal, differential communication conductive path, and differential communication connector disclosed herein have been completed based on the above-mentioned circumstances, and aim to shorten the untwisted length of the core wires that make up a differential communication cable. [Means for solving the problem]

[0006] The differential communication terminal of the first disclosure includes: The terminal includes a pair of terminal fittings each having an open-barrel shaped insulation barrel portion. The pair of insulation barrel portions are individually crimped to a pair of untwisting portions arranged in parallel on the left and right sides of a pair of core wires constituting a differential communication cable, Each of the insulation barrel portions has a bottom plate portion curved in a minor arc shape, and a pair of crimping pieces extending tangentially obliquely upward from both circumferential ends of the bottom plate portion, In a state in which the pair of insulation barrel portions are arranged in parallel with a space therebetween in the left-right direction, two of the four crimping pieces that are most distant in the parallel direction are defined as outer crimping pieces, and two of the crimping pieces that are most closely spaced in the parallel direction are defined as inner crimping pieces. one of the insulation barrel portions has a configuration in which a distance between an axis of the core wire and a tip of the inner crimping piece is smaller than a distance between the axis of the core wire and a tip of the outer crimping piece in the parallel direction, The other insulation barrel portion has a configuration in which, in the parallel direction, the distance between the axis of the core wire and the tip of the inner crimping piece is smaller than the distance between the axis and the tip of the outer crimping piece, or is the same as the distance between the axis and the tip of the outer crimping piece.

[0007] The differential communication conductive path of the second disclosure is: A pair of terminal fittings each having a pair of open-barrel shaped insulation barrel portions; a differential communication cable having a twisted pair of wires consisting of a pair of core wires, The pair of core wires has a pair of untwisting portions arranged in parallel on the left and right, Each of the insulation barrel portions has a bottom plate portion curved in a minor arc shape and a pair of crimping pieces extending from both ends of the bottom plate portion in a circumferential direction, the pair of insulation barrel portions are crimped to the pair of untwisting portions so as to bring the bottom plate portion and the pair of crimping pieces into close contact with each other, In a state where the crimping pieces are deployed in a form in which they extend tangentially obliquely upward from both circumferential ends of the bottom plate portion, when the two crimping pieces that are most distant from each other in the parallel direction among the four crimping pieces are defined as outer crimping pieces, and when the two crimping pieces that are most closely adjacent to each other in the parallel direction are defined as inner crimping pieces, one of the insulation barrel portions has a configuration in which a distance between an axis of the core wire and a tip of the inner crimping piece is smaller than a distance between the axis of the core wire and a tip of the outer crimping piece in the parallel direction, The other insulation barrel portion has a configuration in which, in the parallel direction, the distance between the axis of the core wire and the tip of the inner crimping piece is smaller than the distance between the axis and the tip of the outer crimping piece, or is the same as the distance between the axis and the tip of the outer crimping piece.

[0008] The third disclosed differential communication connector comprises: A conductive path for differential communication according to the second disclosure; and a housing for accommodating the pair of terminal fittings. Effect of the Invention

[0009] According to the first to third disclosures, it is possible to shorten the untwisted length of the core wires that constitute the differential communication cable. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a perspective view of a differential communication connector according to a first embodiment. [Diagram 2] FIG. 2 is an exploded perspective view of the differential communication connector shown in FIG. [Diagram 3] FIG. 3 is a perspective view of a pair of terminal fittings that constitute the differential communication connector shown in FIG. 1, illustrating a state in which the pair of terminal fittings are arranged in parallel before being crimped to core wires. [Figure 4] FIG. 4 is a cross-sectional plan view of the differential communication connector shown in FIG. [Diagram 5]FIG. 5 is a rear view that typically illustrates the crimping structure between a pair of terminal fittings and an untwisting portion of a core wire that constitute the differential communication connector shown in FIG. [Figure 6] FIG. 6 is a rear view that typically illustrates a process of crimping a pair of terminal fittings and an untwisting portion of a core wire that constitute the differential communication connector shown in FIG. [Figure 7] FIG. 7 is a rear view that typically illustrates a process of crimping a pair of terminal fittings and a core wire, the pair having an insulation barrel portion with a different shape from that of the first embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] [Description of the embodiments of the present disclosure] First, embodiments of the present disclosure will be listed and described. Any combination of the following embodiments without causing any contradiction is also included in the embodiment for carrying out the present invention. The differential communication terminal of the first disclosure includes: (1) A differential communication cable includes a pair of terminal fittings each having a pair of open-barrel shaped insulation barrel portions, the pair of insulation barrel portions being individually crimped to a pair of untwisting portions arranged in parallel on the left and right of a pair of core wires constituting the differential communication cable, each of the insulation barrel portions having a bottom plate portion curved in a minor arc shape and a pair of crimping pieces extending tangentially obliquely upward from both circumferential ends of the bottom plate portion, and when the pair of insulation barrel portions are arranged in parallel and spaced apart in the left and right direction, the two crimping pieces among the four crimping pieces that are furthest apart in the parallel direction are crimped to each other. When the two crimping pieces closest to each other in the parallel direction are defined as the outer crimping piece, one of the insulation barrel parts has a configuration in which the distance between the axis of the core wire and the tip of the inner crimping piece in the parallel direction is smaller than the distance between the axis of the core wire and the tip of the outer crimping piece, and the other insulation barrel part has a configuration in which the distance between the axis of the core wire and the tip of the inner crimping piece in the parallel direction is smaller than the distance between the axis of the core wire and the tip of the outer crimping piece or is the same as the distance between the axis of the core wire and the tip of the outer crimping piece. With this configuration, the parallel spacing of the core wires can be narrowed compared to a pair of insulation barrel parts in which the distance between the axis of the core wire and the tip of the inner crimping piece is the same as the distance between the axis of the core wire and the tip of the outer crimping piece. Therefore, the untwisting length of the core wires constituting the differential communication cable can be shortened.

[0012] (2) In (1), the length of extension of the inner crimping piece from the bottom plate is preferably shorter than the length of extension of the outer crimping piece from the bottom plate. With this configuration, the acute angle of the extension direction of the inner crimping piece with respect to the direction perpendicular to the parallel direction can be secured large, so that it is easier to prevent the core wire from interfering with the inner crimping piece during crimping.

[0013] The differential communication conductive path of the second disclosure is: (3) A differential communication cable including a pair of terminal fittings having a pair of open-barrel shaped insulation barrel portions, and a twisted pair wire consisting of a pair of core wires, wherein the pair of core wires has a pair of untwisting portions arranged in parallel on the left and right, each of the insulation barrel portions has a bottom plate portion curved in a minor arc shape and a pair of crimping pieces extending from both circumferential ends of the bottom plate portion, the pair of insulation barrel portions are crimped to the pair of untwisting portions so as to bring the bottom plate portion and the pair of crimping pieces into intimate contact with each other, and when the crimping pieces are deployed in a form extending tangentially obliquely upward from both circumferential ends of the bottom plate portion, four of the crimping pieces are crimped in the parallel direction When the two crimping pieces which are most distant in position in the parallel direction are defined as outer crimping pieces and the two crimping pieces which are closest in position in the parallel direction are defined as inner crimping pieces, one of the insulation barrel parts has a configuration in which the distance between the axis of the core wire and the tip of the inner crimping piece in the parallel direction is smaller than the distance between the axis of the core wire and the tip of the outer crimping piece, and the other insulation barrel part has a configuration in which the distance between the axis of the core wire and the tip of the inner crimping piece in the parallel direction is smaller than the distance between the axis of the core wire and the tip of the outer crimping piece or is the same as the distance between the axis of the core wire and the tip of the outer crimping piece. With this configuration, the parallel interval of the core wires can be narrowed compared to one in which the distance between the axis of the core wire and the tip of the inner crimping piece is the same as the distance between the axis of the core wire and the tip of the outer crimping piece when the crimping pieces are deployed. Therefore, the length of the core wires constituting the differential communication cable to be untwisted can be shortened.

[0014] (4) In (3), it is preferable that the length of extension of the inner crimping piece from the bottom plate portion is shorter than the length of extension of the outer crimping piece from the bottom plate portion. With this configuration, when the crimping pieces are deployed, the acute angle of the extension direction of the inner crimping piece with respect to the direction perpendicular to the parallel direction can be secured large, so that it is easier to prevent the core wire from interfering with the inner crimping piece during crimping.

[0015] The third disclosed differential communication connector comprises: (5) A differential communication cable comprising the conductive path for differential communication according to (3) or (4) and a housing for accommodating the pair of terminal fittings. With this configuration, the parallel spacing of the core wires can be narrowed compared to a configuration in which the distance between the axis of the core wire and the tip of the inner crimping piece is the same as the distance between the axis of the core wire and the tip of the outer crimping piece when the crimping pieces are deployed. This allows the untwisting length of the core wires constituting the differential communication cable to be shortened.

[0016] [Details of the embodiment of the present disclosure] [Example 1] A differential communication connector A according to a first embodiment of the present disclosure will be described with reference to Figs. 1 to 7. The present invention is not limited to these examples, but is defined by the claims, and includes all modifications within the meaning and scope equivalent to the claims. In this first embodiment, the F direction in Figs. 1 to 4 is defined as the front with respect to the front-rear direction. The H direction in Figs. 1 to 3 and 5 to 7 is defined as the up direction with respect to the up-down direction. The R direction in Figs. 1 to 7 is defined as the right direction with respect to the left-right direction.

[0017] As shown in Figs. 1, 2 and 4, the differential communication connector A of the first embodiment is configured to include a housing 10, an outer conductor 11, a dielectric 15 and a differential communication conductive path 20. The housing 10 is a single part made of synthetic resin having an accommodation space 18 therein (see Fig. 4). The outer conductor 11 and the dielectric 15 are accommodated in the accommodation space 18. As shown in Figs. 1 and 2, the outer conductor 11 is configured by assembling a first shell 12 and a second shell 13. The second shell 13 is assembled to the rear end of the first shell 12. A cylindrical fitting portion 14 is formed at the rear end of the second shell 13. The dielectric 15 is configured by combining an upper member 16 and a lower member 17 vertically. Inside the dielectric 15, a terminal accommodation chamber 19 is formed for accommodating a pair of left and right terminal fittings 40L and 40R described later.

[0018] As shown in FIG. 4, the differential communication conductive path 20 includes one differential communication cable 21 and a pair of terminal fittings 40L, 40R. The differential communication cable 21 includes a pair of core wires 22 made of coated electric wires, a shield foil 27, a sheath 28, and a braided wire 29. The shield foil 27 is cylindrical and surrounds the pair of core wires 22. The sheath 28 is cylindrical and surrounds the shield foil 27. The braided wire 29 is cylindrical and is embedded concentrically within the sheath 28. The front end of the braided wire 29 is turned backward to form a folded portion 30 that is covered on the outer circumferential surface of the sheath 28. The cylindrical fitting portion 14 of the outer conductor 11 is crimped to the folded portion 30 of the braided wire 29.

[0019] As shown in Fig. 4, the pair of core wires 22 are twisted together in the shielding foil 27 to form a twisted pair wire 23. The portion of the pair of core wires 22 exposed forward from the front end of the shielding foil 27 and the sheath 28 is defined as the untwisting portion 24. The untwisting portion 24 is a portion that is untwisted and led forward in a straight state. The pair of untwisting portions 24 are arranged so that they are spaced apart in the left-right direction with their axes facing the front-rear direction. In other words, the direction in which the pair of core wires 22 are lined up in the untwisting portion 24 corresponds to the left-right direction.

[0020] The front end of the untwisting section 24 is in a state where the insulating coating 25 has been removed to expose the conductor 26. In the region of the untwisting section 24 behind the exposed portion of the conductor 26, the insulating coating 25 is kept in a state where it surrounds the conductor 26. The wire barrel portions 42 of the pair of terminal fittings 40L, 40R described later are individually crimped to the exposed portions of the two conductors 26. The insulation barrel portions 45L, 45R of the pair of terminal fittings 40L, 40R are individually crimped to the front end of the insulating coating 25 of the untwisting section 24. A metal clip 31 is fixed to a portion of the insulating coating 25 of the untwisting section 24 behind the insulation barrel portions 45L, 45R. The wire barrel portion 42 and the insulation barrel portions 45L, 45R are crimped to the core wire 22 simultaneously with respect to the pair of terminal fittings 40L, 40R. To enable this simultaneous crimping, the spacing between the insulating coatings 25 at the pair of untwisting portions 24 is set to be wider than the spacing between the core wires 22 at the front ends of the shielding foils 27 .

[0021] The left terminal fitting 40L and the right terminal fitting 40R are symmetrical. Each of the terminal fittings 40L, 40R is a single component having a rectangular cylindrical terminal body 41, a wire barrel 42, and an insulation barrel 45L, 45R. The wire barrel 42 extends rearward from the rear end of the cylindrical body. The wire barrel 42 has a lower plate 43 connected to the cylindrical body and a pair of symmetrical crimping pieces 44 extending from the lower plate 43. Before being crimped to the core wire 22, the pair of crimping pieces 44 extend from the lower plate 43 diagonally upwards.

[0022] The insulation barrel portions 45L and 45R are portions extending rearward from the wire barrel portion 42. The left insulation barrel portion 45L has a bottom plate portion 46 extending rearward from the rear end of the lower plate portion 43, and a pair of asymmetric crimping pieces 47L and 48L extending from the bottom plate portion 46. The right insulation barrel portion 45R has a bottom plate portion 46 extending rearward from the rear end of the lower plate portion 43, and a pair of asymmetric crimping pieces 47R and 48R extending from the bottom plate portion 46. As shown in Figs. 5 and 6, in a rear view of the insulation barrel portions 45L and 45R seen from the rear, the bottom plate portion 46 has a minor arc shape curved so as to bulge downward. The bottom plate portion 46 has a shape symmetrical with respect to a vertical axis of symmetry 49 perpendicular to the parallel direction (left-right direction) of the core wires 22.

[0023] Before the insulation barrel portions 45L, 45R are crimped to the core wire 22, as shown in Fig. 6, the crimping pieces 47L, 47R, 48L, 48R form an open barrel shape extending in a cantilevered manner obliquely upward from both circumferential edges of the bottom plate portion 46 so as to be tangential to the bottom plate portion 46. Fig. 6 shows a schematic diagram of a process in which a pair of left and right insulation barrel portions 45L, 45R are simultaneously crimped to the untwisting portions 24 of two core wires 22 arranged in parallel on the left and right. Before crimping, the untwisting portion 24 is placed on the bottom plate portion 46.

[0024] In this state, the two pieces of the four crimping pieces 47L, 47R, 48L, 48R arranged on the left and right that are most distant in the parallel direction are defined as the outer crimping pieces 47L, 47R. The two pieces of the four crimping pieces 47L, 47R, 48L, 48R arranged on the left and right that are most close in the parallel direction are defined as the inner crimping pieces 48L, 48R. In the rear view, the angle α formed by the inner crimping pieces 48L, 48R with respect to the direction parallel to the symmetry axis 49 is the same as the angle α formed by the outer crimping pieces 47L, 47R. The extension length of the inner crimping pieces 48L, 48R from the bottom plate portion 46 is shorter than the extension length of the inner crimping pieces 48L, 48R from the bottom plate portion 46. Therefore, in the arrangement direction of the core wire 22 and the arrangement direction (left-right direction) of the insulation barrel portions 45L, 45R, the maximum distance N between the axis C of the core wire 22 and the inner crimping pieces 48L, 48R is shorter than the maximum distance W between the axis C of the core wire 22 and the outer crimping pieces 47L, 47R. The maximum distance N is the distance between the axis C of the core wire 22 and the tips of the inner crimping pieces 48L, 48R in the parallel arrangement direction of the insulation barrel portions 45L, 45R. The maximum distance W is the distance between the axis C of the core wire 22 and the tips of the outer crimping pieces 47L, 47R in the parallel arrangement direction of the insulation barrel portions 45L, 45R.

[0025] 7 is a rear view diagrammatically illustrating the process of crimping core wire 22 in insulation barrel portion 50 of a comparative example having a bilaterally symmetrical shape in rear view. In insulation barrel portion 50 of this comparative example, maximum distance M between axis C of core wire 22 and inner crimping piece 51 is the same as maximum distance M between axis C of core wire 22 and outer crimping piece 52. Maximum distance M is the distance between axis C of core wire 22 and the tip of inner crimping piece 51, and is also the distance between axis C of core wire 22 and the tip of outer crimping piece 52 in the parallel arrangement direction of insulation barrel portions 45L, 45R. The total extension length obtained by combining the extension length of the inner crimping piece 51 and the extension length of the outer crimping piece 52 is the same as the total extension length obtained by combining the extension length of the inner crimping pieces 48L, 48R and the extension length of the outer crimping pieces 47L, 47R in Example 1. In the insulation barrel portion 50 of the comparative example, the angle α that the inner crimping piece 51 makes with respect to the direction parallel to the symmetry axis 49 and the angle α that the outer crimping piece 52 makes are the same angle α as in Example 1.

[0026] In the parallel direction of the core wire 22, the maximum distance M from the axis C of the core wire 22 to the inner crimping piece 51 in the comparative example is longer than the maximum distance N from the axis C of the core wire 22 to the inner crimping pieces 48L, 48R in this embodiment 1. The separation distance D to be secured between the tips of the inner crimping pieces 48L, 48R when a pair of insulation barrel portions 45L, 45R are crimped simultaneously in the embodiment 1 is the same as the separation distance D to be secured between the tips of the inner crimping pieces 51 when a pair of insulation barrel portions 50 are crimped simultaneously in the comparative example. Therefore, the distance P2 of the axis C of the core wire 22 in the comparative example is longer than the distance P1 of the axis C of the core wire 22 in the embodiment 1. Therefore, the length (untwisted length) of the untwisted portion 24 of the core wire 22 in the comparative example is longer than the length (untwisted length) of the untwisted portion 24 of the core wire 22 in the comparative example.

[0027] The differential communication connector A of the first embodiment includes a differential communication conductive path 20 and a housing 10. The differential communication conductive path 20 includes a pair of terminal fittings 40L, 40R having a pair of open-barrel-shaped insulation barrel portions 45L, 45R, and a differential communication cable 21 having a twisted pair wire 23 consisting of a pair of core wires 22. The pair of terminal fittings 40L, 40R constituting the differential communication conductive path 20 are accommodated in the housing 10. The left insulation barrel portion 45L has a bottom plate portion 46 curved in a minor arc shape and a pair of crimping pieces 47L, 48L extending from both ends of the bottom plate portion 46 in the circumferential direction. The right insulation barrel portion 45R has a bottom plate portion 46 curved in a minor arc shape and a pair of crimping pieces 47R, 48R extending from both ends of the bottom plate portion 46 in the circumferential direction. The pair of insulation barrel portions 45L, 45R are crimped to a pair of untwisting portions 24 arranged in parallel on the left and right sides of the pair of core wires 22 so as to tightly contact the bottom plate portion 46 and the pair of crimping pieces 47L, 48L, or the bottom plate portion 46 and the pair of crimping pieces 47R, 48R.

[0028] The four crimping pieces 47L, 47R, 48L, 48R arranged on the left and right sides will be described below in a state before the pair of insulation barrel portions 45L, 45R are crimped to the core wire 22, and in a state in which the crimping pieces 47L, 47R, 48L, 48R are deployed to extend tangentially obliquely upward from both circumferential ends of the bottom plate portion 46. Of the four crimping pieces 47L, 47R, 48L, 48R, the two crimping pieces 47L, 47R that are most distant in the parallel direction are defined as the outer crimping pieces 47L, 47R. Of the four crimping pieces 47L, 47R, 48L, 48R, the two crimping pieces 48L, 48R that are most adjacent in the parallel direction are defined as the inner crimping pieces 48L, 48R. The left and right insulation barrel portions 45L, 45R are configured such that, in the parallel direction, the maximum distance N between the axis C of the core wire 22 and the inner crimping pieces 48L, 48R is smaller than the maximum distance W between the axis C of the core wire 22 and the outer crimping pieces 47L, 47R.

[0029] 7, before the insulation barrel portion 50 is crimped to the core wire 22, i.e., in a state where the crimped crimping pieces 51, 52 are unfolded, the maximum distance M between the axis C of the core wire 22 and the inner crimping piece 51 is the same as the maximum distance M between the axis C of the core wire 22 and the outer crimping piece 52. Compared to this comparative example, in this embodiment 1, the parallel interval P1 of the core wires 22 can be narrowed. Therefore, the untwisted length of the core wires 22 constituting the differential communication cable 21 can be shortened. As a result, a decrease in the communication performance of the differential communication cable 21 can be suppressed.

[0030] The extension length of the inner crimping pieces 48L, 48R from the bottom plate portion 46 is shorter than the extension length of the outer crimping pieces 47L, 47R from the bottom plate portion 46. With this configuration, in the state before crimping, i.e., in the state where the crimping pieces 47L, 47R, 48L, 48R are deployed, it is possible to ensure a large acute angle α of the extension direction of the inner crimping pieces 48L, 48R with respect to the direction perpendicular to the parallel direction (direction parallel to the symmetric axis 49). This makes it easier to prevent the core wire 22 from interfering with the inner crimping pieces 48L, 48R during crimping.

[0031] [Other Examples] The present invention is not limited to the embodiments described above and shown in the drawings, but is indicated by the claims. The present invention includes the equivalent meaning of the claims and all modifications within the scope of the claims, including the following embodiments. In a state in which the crimping pieces are deployed and in a state before crimping, the extension length of the inner crimping piece and the extension length of the outer crimping piece from the bottom plate portion may be the same. When the crimping pieces are deployed and before crimping, the angle of the extension direction of the inner crimping piece relative to the direction perpendicular to the parallel direction and the angle of the extension direction of the outer crimping piece may be different. The pair of insulation barrel portions may have an asymmetric shape. [Explanation of symbols]

[0032] A…Differential communication connector C: Axis of the core wire D…Inner crimp piece spacing M: Maximum distance between the axis of the core wire and the inner crimped piece in the comparative example (distance between the axis of the core wire and the tip of the inner crimped piece in the comparative example), Maximum distance between the axis of the core wire and the outer crimped piece in the comparative example (distance between the axis of the core wire and the tip of the outer crimped piece in the comparative example) N: Maximum distance between the axis of the core wire and the inner crimped piece in Example 1 (distance between the axis of the core wire and the tip of the inner crimped piece in Example 1) P1: Distance between the axial centers of the core wires in Example 1 P2: Distance between the axial centers of the core wires in the comparative example W: Maximum distance between the axis of the core wire and the outer crimped piece in Example 1 (distance between the axis of the core wire and the tip of the outer crimped piece in Example 1) α: Angle between the inner and outer crimping pieces with respect to the direction parallel to the axis of symmetry 10. Housing 11...Outer conductor 12…First shell 13…Second shell 14...Cylindrical fitting part 15...Dielectric 16...Upper member 17...Lower member 18…Containment space 19...Terminal chamber 20...Differential communication conductive path 21...Differential communication cable 22…Core wire 23...Twisted pair wire 24…Untwisting section 25…Insulating coating 26…Conductor 27…Shielding foil 28…Sheath 29…braided wire 30…Folding part 31…Clip 40L…Terminal fittings 40R…Terminal fitting 41...Terminal body 42…Wire barrel section 43…Lower plate part 44…Crimping piece 45L…Insulation barrel section 45R…Insulation barrel part 46…Bottom plate part 47L…Outer crimp piece (crimp piece) 47R…Outer crimp piece (crimp piece) 48L…Inner crimp piece (crimp piece) 48R…Inner crimp piece (crimp piece) 49…Axis of symmetry 50…Insulation barrel part of comparative example 51…Inner crimp piece 52…Outer crimp piece

Claims

1. The terminal includes a pair of terminal fittings each having an open-barrel shaped insulation barrel portion. The pair of insulation barrel portions are individually crimped to a pair of untwisting portions arranged in parallel on the left and right sides of a pair of core wires constituting a differential communication cable, Each of the insulation barrel portions has a bottom plate portion curved in a minor arc shape, and a pair of crimping pieces extending tangentially obliquely upward from both circumferential ends of the bottom plate portion, In a state in which the pair of insulation barrel portions are arranged in parallel with a space therebetween in the left-right direction, two of the four crimping pieces that are positioned most apart in the parallel direction are defined as outer crimping pieces, and two of the crimping pieces that are positioned closest to each other in the parallel direction are defined as inner crimping pieces. one of the insulation barrel portions has a configuration in which a distance between an axis of the core wire and a tip of the inner crimping piece is smaller than a distance between the axis of the core wire and a tip of the outer crimping piece in the parallel direction, The other insulation barrel portion is configured such that, in the parallel direction, the distance between the axis of the core wire and the tip of the inner crimping piece is smaller than the distance between the axis and the tip of the outer crimping piece, or is the same as the distance between the axis and the tip of the outer crimping piece.

2. 2. The differential communication terminal according to claim 1, wherein the inner crimping pieces extend from the bottom plate by a length shorter than the outer crimping pieces extend from the bottom plate.

3. A pair of terminal fittings each having a pair of open-barrel shaped insulation barrel portions; a differential communication cable having a twisted pair of wires consisting of a pair of core wires, The pair of core wires has a pair of untwisting portions arranged in parallel on the left and right, Each of the insulation barrel portions has a bottom plate portion curved in a minor arc shape and a pair of crimping pieces extending from both ends of the bottom plate portion in a circumferential direction, the pair of insulation barrel portions are crimped to the pair of untwisting portions so as to bring the bottom plate portion and the pair of crimping pieces into close contact with each other, In a state where the crimping pieces are deployed in a form in which they extend tangentially obliquely upward from both circumferential ends of the bottom plate portion, the two crimping pieces that are most distant from each other in the parallel direction among the four crimping pieces are defined as outer crimping pieces, and the two crimping pieces that are most closely spaced from each other in the parallel direction are defined as inner crimping pieces. one of the insulation barrel portions has a configuration in which a distance between an axis of the core wire and a tip of the inner crimping piece is smaller than a distance between the axis of the core wire and a tip of the outer crimping piece in the parallel direction, The other insulation barrel portion is configured such that, in the parallel direction, the distance between the axis of the core wire and the tip of the inner crimping piece is smaller than the distance between the axis and the tip of the outer crimping piece, or is the same as the distance between the axis and the tip of the outer crimping piece.

4. 4. The differential communication conductive path according to claim 3, wherein the inner crimping piece has an extension length from the bottom plate portion that is shorter than the outer crimping piece having an extension length from the bottom plate portion.

5. A conductive path for differential communication according to claim 3 or 4; and a housing that accommodates the pair of terminal fittings.

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