JP2004087197A - Connector, and method and structure of connecting transmission cable - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of connecting a transmission cable by which electric fields generated by both signal wires become approximately symmetrical, resutlting in uniform crosstalk between both signal wires and the reduction of near-end crosstalk, and characteristic impedance also becomes uniform by making uniform the distance between the drain wire and the signal wires, and to provide a connector. <P>SOLUTION: When the transmission cable 1 equipped with a pair of signal wires 3 and a drain wire 9 is connected with a connector 17, the pair of signal wires 3 are distributed to the upper face and the lower face of a signal contact 21 and connected each other. The drain wire 9 is easily inserted for connection against an elastic force into a clamp 37 formed between tops of upper and lower terminals 27, 29 which have arm shapes having elastic forces and compose a ground contact 25. The inserted drain wire 9 is not easily disconnected due to the erastic forces of the upper and lower terminals 27, 29. Since the drain wire 9 is connected with the clamp 37 arranged approximately in the center in the vertical direction, current routes flowing from the two signal wires 3 to the ground are made uniform. Consequently, the near-end crosstalk is reduced, and the deviation of characteristic impedance of each signal wire 3 at the connector connecting part is eliminated. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a connector used for connection to a transmission cable, a connection method of the transmission cable using the connector, and a connection structure thereof.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there is a collective cable used between servers such as computers, and is used when reception and transmission are performed instantaneously or simultaneously smoothly even when a large amount of communication signals are transmitted instantaneously. The above-mentioned collective cable is configured by arranging a large number of signal lines or signal line pairs in a plurality of layers from the inner side to the outer side. Note that the signal line is formed by coating the outer periphery with a covering material made of a low-density insulator, and the signal line pair is a two-core coaxial cable (Twinax) holding a pair of signal lines in parallel.
[0003]
Referring to FIG. 6, in the two-core coaxial cable 101, one or two drain lines 103 are attached substantially in parallel to two drain line connection side signal lines 105A and drain line non-connection side drain lines 105B. The connector 107 to which the two-core coaxial cable 101 is shielded is connected to a signal contact 109 for connecting the two signal lines 105A and 105B and a ground contact 111 for connecting the drain line 103. Are provided.
[0004]
As a method of connecting to the connector 107, two signal lines 105A and 105B are connected one by one to the upper and lower surfaces of the signal contact 109, for example, by soldering, and the drain line 103 is connected to either the upper or lower surface of the ground contact 111. For example, in FIG. 6, it is connected to the upper surface by soldering.
[0005]
[Problems to be solved by the invention]
By the way, in the conventional connection method to the connector 107, since the connection of the drain line 103 is only on one surface of the ground contact 111, the signal line 105A and the drain line 103 on the drain line connection side and the drain line There is a difference in the interval between the connection-side signal line 105B and the drain line 103, as indicated by the arrow in FIG. That is, the distance between the signal line 105A on the drain line connection side and the drain line 103 is smaller than the distance between the signal line 105B on the drain line non-connection side and the drain line 103.
[0006]
Due to this difference, the electric field generated between the signal lines 105A and 105B and the drain line 103 is different. In the signal line 105A close to the drain line 103, the ratio of the lines of electric force converging on the drain line 103 increases, and the induced electromotive force (crosstalk) decreases. On the other hand, the signal line 105B that is far from the drain line 103 has a problem that the ratio of the lines of electric force converging on the drain line 103 decreases, and the induced electromotive force (crosstalk) increases.
[0007]
Further, since the ground potential of each two-core coaxial cable 101 is made common, it is necessary to conduct the grounds of all the ground contacts 111, so that the ground becomes complicated, and the transmission characteristics may be an unstable factor. there were.
[0008]
SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem, and an object of the present invention is to make the distance between a drain line and a signal line equal so that the electric fields generated by the two signal lines are substantially symmetrical, and the electric field generated by the two signal lines is reduced. Cross-talk becomes uniform, as a result, near-end crosstalk is reduced and the characteristic impedance becomes uniform, and a connection method and a connector of a transmission cable enabling common ground connection are provided. .
[0009]
[Means for Solving the Problems]
In order to achieve the above object, a connector according to the present invention according to claim 1 has a pair of signal lines and is connected by vertically distributing the pair of signal lines so as to connect a transmission cable having a single drain line. A signal contact provided on the upper and lower surfaces with connecting portions to be connected, and a ground contact provided with a connecting portion for connecting the drain line,
The ground contact, an upper terminal portion and a lower terminal portion in the form of an arm, and a bridge portion integrally connecting an upper portion of the upper terminal portion and an approximately middle portion of the lower terminal portion so as to have an elastic force on a tip end side of the lower terminal portion; And a clamp portion that clamps and connects the drain wire by the elastic force at a substantially central position in the vertical direction of the tip of the upper and lower terminal portions.
[0010]
Therefore, the drain wire is easily inserted into the clamp portion against the elastic force of the upper and lower terminal portions. Moreover, the inserted drain line is securely clamped and connected by the clamp portion so as not to be easily detached by the elastic force of the upper and lower terminal portions.
[0011]
Further, since the drain line is connected to the clamp portion at a substantially central position in the vertical direction of the ground contact, the path of the current flowing from the two signal lines to the ground becomes vertically symmetric and uniform, so that near-end crosstalk is reduced. In addition, the bias of the characteristic impedance of each signal line at the connector connection portion is eliminated.
[0012]
According to a second aspect of the present invention, in the connector according to the first aspect, at least one of the clamp portions of the upper and lower terminal portions is provided with a protrusion that cuts into the drain line. It is assumed that.
[0013]
Therefore, the drain line clamped by the clamp portion cannot be detached more easily by the protrusion.
[0014]
According to a third aspect of the present invention, there is provided the connector according to the first or second aspect, wherein at least one of the clamp portions of the upper and lower terminal portions is provided with a tapered portion extending toward the distal end. It is characterized by the following.
[0015]
Therefore, the drain wire is more easily inserted into the clamp portion by the tapered portion spreading forward.
[0016]
According to a fourth aspect of the present invention, a transmission cable including a pair of signal lines and one drain line includes a signal contact for connecting the signal line and a ground contact for connecting the drain line. The connection method of the transmission cable connected to the connector
A pair of signal lines are distributed and connected to the upper and lower surfaces of the signal contact, and a substantially vertical center provided between the upper terminal portion and the distal end portion of the lower terminal portion in the form of an arm having elastic force constituting a ground contact. The drain wire is inserted into the clamp portion at a position against the elastic force, so that the drain wire is clamped and connected by the elastic force of the upper and lower terminal portions.
[0017]
Therefore, the operation is similar to that of the first aspect, and the drain wire is easily inserted into the clamp portion against the elastic force of the upper and lower terminal portions. Moreover, the inserted drain line is securely clamped and connected by the clamp portion so as not to be easily detached by the elastic force of the upper and lower terminal portions.
[0018]
Further, since the drain line is connected to the clamp portion at a substantially central position in the vertical direction of the ground contact, the path of the current flowing from the two signal lines to the ground becomes vertically symmetric and uniform, so that near-end crosstalk is reduced. In addition, the bias of the characteristic impedance of each signal line at the connector connection portion is eliminated.
[0019]
According to a fifth aspect of the present invention, there is provided the transmission cable connecting method according to the fourth aspect, wherein the protrusion provided on at least one of the clamp portions of the upper and lower terminal portions is provided. It is characterized in that it is clamped so as to bite into the drain line.
[0020]
Therefore, the operation is the same as that of the second aspect, and the drain line clamped by the clamp portion is not easily detached by the protrusion.
[0021]
According to a sixth aspect of the present invention, there is provided a transmission cable connecting method according to the fourth or fifth aspect, wherein the distal end side is provided on at least one of the clamp portions of the upper and lower terminal portions. The drain line can be easily inserted into the clamp portion by the tapered portion that spreads out.
[0022]
Therefore, the operation is similar to that of the third aspect, and the drain wire is more easily inserted into the clamp portion by the tapered portion expanding forward.
[0023]
According to a seventh aspect of the present invention, there is provided a transmission cable connection structure for connecting a signal line of a transmission cable to a signal contact of a connector and a drain line of the transmission cable to a ground contact of the connector.
The signal contact is provided with connecting portions for vertically distributing and connecting a pair of signal lines, and the ground contact is provided with an upper terminal portion and a lower terminal portion in the form of an arm, and a tip of the upper and lower terminal portions. A bridge portion that integrally connects the upper and lower terminal portions substantially at the center so as to have an elastic force on the side, and a drain line is clamped by the elastic force at a substantially vertical center position of the tip of the upper and lower terminal portions. And a clamp portion for connecting by connecting.
[0024]
Therefore, the operation is similar to that of the first aspect, and the drain wire is easily inserted into the clamp portion against the elastic force of the upper and lower terminal portions. Moreover, the inserted drain line is securely clamped and connected by the clamp portion so as not to be easily detached by the elastic force of the upper and lower terminal portions.
[0025]
Further, since the drain line is connected to the clamp portion at a substantially central position in the vertical direction of the ground contact, the path of the current flowing from the two signal lines to the ground becomes vertically symmetric and uniform, so that near-end crosstalk is reduced. In addition, the bias of the characteristic impedance of each signal line at the connector connection portion is eliminated.
[0026]
According to an eighth aspect of the present invention, there is provided the transmission cable connection structure according to the seventh aspect, wherein at least one of the clamp portions of the upper and lower terminal portions has a projection that cuts into a drain wire. A part is provided.
[0027]
Therefore, the operation is the same as that of the second aspect, and the drain line clamped by the clamp portion is not easily detached by the protrusion.
[0028]
According to a ninth aspect of the present invention, there is provided the transmission cable connection structure according to the seventh or eighth aspect, wherein at least one of the upper and lower terminal clamp portions is provided at the distal end side. It is characterized by providing a widened taper portion.
[0029]
Therefore, the operation is similar to that of the third aspect, and the drain wire is more easily inserted into the clamp portion by the tapered portion expanding forward.
[0030]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0031]
As for the transmission cable according to this embodiment, referring to FIGS. 5A and 5B, a two-core coaxial cable 1 has a coating material 5 made of an insulator on the outer periphery of a signal line 3 as a center conductor. The drain wire 7 is attached to the pair of the signal lines 3 and a tape material 9 such as aluminum is wound around the outer periphery.
[0032]
Referring to FIG. 1, a description will be given of a connector 17 according to an embodiment of the present invention and a connection structure when the above-described two-core coaxial cable 1 is connected to the connector 17. A signal contact 21 provided on upper and lower surfaces with connection portions 19A and 19B for distributing and connecting the signal lines 3 up and down, and a ground connection portion 23 as a connection portion for connecting the drain line 9 substantially at the center in the vertical direction. And a ground contact 25 serving as a ground provided with.
[0033]
Here, the ground contact 25 constituting the main part of the embodiment of the present invention will be described in more detail.
[0034]
2, the ground contact 25 is provided with an upper terminal portion 27 and a lower terminal portion 29 which form an arm extending in the front-rear direction (the left-right direction in FIG. 2). , 29 are integrally connected by a bridge portion 31 substantially in the middle in the front-rear direction (the left-right direction in FIG. 2). The upper and lower terminal portions 27 and 29 have an elastic force that can be bent in the vertical direction in FIG.
[0035]
Further, a clamp portion 37 including an upper clamp portion 33 and a lower clamp portion 35 facing each other at a substantially central position in the vertical direction in FIG. The drain wire 9 is clamped by the upper and lower clamp portions 33 and 35 by the elastic force of the lower terminal portions 27 and 29 and is connected to the ground contact 25. Note that the above-described clamp portion 37 corresponds to the ground connection portion 23 of the ground contact 25.
[0036]
As a method of connecting the two-core coaxial cable 1 to the connector 17 described above, for example, two signal lines 3 of the two-core coaxial cable 1 are distributed one by one to the connection portions 19A and 19B on the upper and lower surfaces of the signal contact 21, for example. Connected by soldering.
[0037]
On the other hand, the drain line 9 is inserted between the upper clamp portion 33 and the lower clamp portion 35 at substantially the center of the ground contact 25 in the vertical direction as indicated by the arrow in FIG. The thickness of the drain line 9 in the vertical direction is slightly larger than the gap (gap) between the upper clamp part 33 and the lower clamp part 35. When the drain wire 9 is inserted between the upper clamp portion 33 and the lower clamp portion 35 against the elastic force of the upper and lower terminal portions 27 and 29, as shown in FIG. In addition, since the upper and lower terminal portions 27 and 29 bend in opposite directions to increase the distance between the upper clamp portion 33 and the lower clamp portion 35 vertically, the drain line 9 is easily inserted in the direction of the arrow. Moreover, the inserted drain wire 9 is reliably crushed between the upper clamp portion 33 and the lower clamp portion 35 by the elastic force of the upper and lower terminal portions 27 and 29 as shown in FIG. So that it does not come off easily.
[0038]
Further, since the drain line 9 is connected to the clamp portion 37 serving as the ground connection portion 23 at a position where the drain line 9 is symmetrically distributed in the vertical direction of the ground contact 25, the path of the current flowing from the two signal lines 3 to the ground (GND) , The near-end crosstalk is reduced, and the characteristic impedance of each signal line 3 at the connector connection portion can be eliminated.
[0039]
Referring to FIGS. 4A and 4B, at least one of the upper and lower clamp portions 33, 35 constituting the clamp portion 37 of the upper and lower terminal portions 27, 29, for example, the upper clamp portion. It is desirable to provide a protrusion 39 in the portion 33 to cut into the drain line 9. As a result, the drain line 9 clamped by the upper and lower clamp portions 33 and 35 is more reliably clamped by the projection 39 and does not easily come off.
[0040]
A tapered portion 41 having a tapered surface extending forward is provided on the front side of the projection 39 (left side of the upper clamp portion 33 in FIGS. 4A and 4B). It is desirable to provide the tapered portion 41 in that the wire 9 can be more easily inserted into the clamp portion 37.
[0041]
The present invention is not limited to the above-described embodiment, but can be embodied in other modes by making appropriate changes.
[0042]
【The invention's effect】
As understood from the above description of the embodiment of the invention, according to the invention of claim 1, the drain wire is easily inserted into the clamp portion against the elastic force of the upper and lower terminal portions and connected. be able to. Moreover, the inserted drain wire can be securely clamped by the clamp portion by the elastic force of the upper and lower terminal portions, and can be easily connected so as not to come off.
[0043]
Further, since the drain line is connected to the clamp portion at the substantially central position in the vertical direction of the ground contact, the path of the current flowing from the two signal lines to the ground can be made vertically symmetrical and uniform. As a result, the near-end crosstalk can be reduced, and the bias of the characteristic impedance of each signal line at the connector connection portion can be eliminated.
[0044]
According to the second aspect of the present invention, by providing the projections on the clamp portion, the drain line can be more easily clamped without coming off.
[0045]
According to the third aspect of the present invention, the drain line can be more easily inserted into the clamp portion by providing the clamp portion with the tapered portion expanding forward.
[0046]
According to the fourth aspect of the present invention, the effect is the same as that of the first aspect, and the drain line can be easily inserted and connected to the clamp portion against the elastic force of the upper and lower terminal portions. Moreover, the inserted drain wire can be securely clamped by the clamp portion by the elastic force of the upper and lower terminal portions, and can be easily connected so as not to come off.
[0047]
Further, since the drain line is connected to the clamp portion at the substantially central position in the vertical direction of the ground contact, the path of the current flowing from the two signal lines to the ground can be made vertically symmetrical and uniform. As a result, the near-end crosstalk can be reduced, and the bias of the characteristic impedance of each signal line at the connector connection portion can be eliminated.
[0048]
According to the fifth aspect of the present invention, the effect is the same as that of the second aspect, and by providing the projection on the clamp portion, the drain line can be more easily clamped without coming off.
[0049]
According to the sixth aspect of the present invention, the same effect as in the third aspect is provided, and the drain line can be more easily inserted into the clamp section by providing the taper section extending forward to the clamp section.
[0050]
According to the seventh aspect of the present invention, the effect is the same as that of the first aspect, and the drain wire can be easily inserted and connected to the clamp portion against the elastic force of the upper and lower terminal portions. Moreover, the inserted drain wire can be securely clamped by the clamp portion by the elastic force of the upper and lower terminal portions, and can be easily connected so as not to come off.
[0051]
Further, since the drain line is connected to the clamp portion at the substantially central position in the vertical direction of the ground contact, the path of the current flowing from the two signal lines to the ground can be made vertically symmetrical and uniform. As a result, the near-end crosstalk can be reduced, and the bias of the characteristic impedance of each signal line at the connector connection portion can be eliminated.
[0052]
According to the eighth aspect of the present invention, the effect is the same as that of the second aspect, and by providing the projection portion on the clamp portion, the drain line can be more easily clamped without coming off.
[0053]
According to the ninth aspect of the invention, the effect is the same as that of the third aspect, and the drain line can be more easily inserted into the clamp portion by providing the taper portion extending forward to the clamp portion.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a connector connection state of a transmission cable according to an embodiment of the present invention.
FIG. 2 is a side view of a ground contact of the connector according to the embodiment of the present invention.
FIGS. 3A to 3C are explanatory diagrams illustrating a process of connecting a drain line of a transmission cable to a clamp portion of a ground contact.
FIGS. 4A and 4B are schematic explanatory views showing an example of a projection and a tapered portion of a clamp portion.
5A is a perspective view of a two-core coaxial cable, and FIG. 5B is a longitudinal sectional view of FIG.
FIG. 6 is a perspective view showing a connector connection state of a conventional two-core coaxial cable.
[Explanation of symbols]
1 2-core coaxial cable (transmission cable)
3 Signal line 9 Drain line 17 Connector 19A, 19B Connection (of signal contact 21)
21 signal contact 23 ground connection portion 25 ground contact 27 upper terminal portion 29 lower terminal portion 31 bridge portion 33 upper clamp portion 35 lower clamp portion 37 clamp portion (corresponding to ground connection portion 23)
39 Projection 41 Taper

Claims (9)

In order to connect a transmission cable having a pair of signal lines and a single drain line, a signal contact having connection portions on upper and lower surfaces for distributing and connecting the pair of signal lines up and down, and the drain line, A ground contact provided with a connecting portion to be connected,
The ground contact, an upper terminal portion and a lower terminal portion in the form of an arm, and a bridge portion integrally connecting an upper portion of the upper terminal portion and an approximately middle portion of the lower terminal portion so as to have an elastic force on a tip end side of the lower terminal portion; And a clamp portion for clamping and connecting the drain wire by the elastic force at a substantially central position in the vertical direction of the tip of the upper and lower terminal portions. 2. The connector according to claim 1, wherein at least one of the upper and lower terminal clamps is provided with a projection that cuts into the drain wire. The connector according to claim 1, wherein at least one of the clamp portions of the upper and lower terminal portions is provided with a tapered portion that spreads toward the distal end. In a transmission cable connection method for connecting a transmission cable including a pair of signal lines and one drain line to a connector including a signal contact for connecting a signal line and a ground contact for connecting a drain line,
A pair of signal lines are distributed and connected to the upper and lower surfaces of the signal contact, and a substantially vertical center provided between the upper terminal portion and the distal end portion of the lower terminal portion in the form of an arm having elastic force constituting a ground contact. A method of connecting a transmission cable, comprising inserting a drain wire into a clamp portion at a position against the elastic force to clamp and connect the drain wire with the elastic force of the upper and lower terminal portions. 5. The transmission cable connection method according to claim 4, wherein the projection is provided on at least one of the clamp portions of the upper and lower terminal portions and clamped so as to bite into the drain wire. The transmission according to claim 4, wherein a drain wire is easily inserted into the clamp portion by a tapered portion provided on at least one of the clamp portions of the upper and lower terminal portions and extending toward the distal end. How to connect the cable. In the connection structure of the transmission cable, in which the signal line of the transmission cable is connected to the signal contact of the connector, and the drain line of the transmission cable is connected to the ground contact of the connector,
The signal contact is provided with connecting portions for vertically distributing and connecting a pair of signal lines, and the ground contact is provided with an upper terminal portion and a lower terminal portion in the form of an arm, and a tip of the upper and lower terminal portions. A bridge portion that integrally connects the upper and lower terminal portions substantially at the center so as to have an elastic force on the side, and a drain line is clamped by the elastic force at a substantially vertical center position of the tip of the upper and lower terminal portions. A connection structure for a transmission cable, comprising: 8. The connection structure for a transmission cable according to claim 7, wherein at least one of the upper and lower terminal clamps has a projection that cuts into the drain wire. 9. The connection structure for a transmission cable according to claim 7, wherein at least one of the clamp portions of the upper and lower terminal portions is provided with a tapered portion that expands toward the distal end.

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