JPH0722090A - Connection structure of signal cable - Google Patents

Abstract

PURPOSE:To increase the efficiency of the work of connecting a signal cable by using a cable structure in which a common earth plate is disposed in place of a drain line provided for each shield layer. CONSTITUTION:A signal-cable connection structure comprises a common earth plate 30 having ground wires 25 that correspond to coaxial lines 1 constituting a signal cable 20 and a presser plate 50 for pressing the plurality of coaxial lines 1 from which outer sheaths 5 are peeled to expose shield layers 4, and for pressing the shielding layers 4 into contact with the common earth plate 30. The plurality of coaxial lines 1 disposed with their shield layers 4 in contact with the common earth plate 30 are pressed by the presser plate 50 to achieve electrical conduction between the shield wires 4 of the plurality of coaxial lines 1 and the ground wires 25 of the common earth plate 30. The number of ground wires 25 connected to the earth plate 30 is specified to match that of earth pins (not shown in the figure) normally provided on the side of a connector 60, while the current capacity, dosage and arrangement, etc., of the ground wires 25 are not specified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal cable connection structure applied when connecting a signal cable (multicore coaxial cable) to a connector or the like.

[0002]

2. Description of the Related Art FIGS. 4 (a), 4 (b) and 4 (c) are schematic side sectional views showing the structure of a conventional signal cable and their sectional views taken along the line AA and the line BB. 5 (a), (b) and (c) are a schematic plan view of a principal part showing a conventional connection structure of a signal cable, a sectional view taken along the line CC and a side sectional view of the principal part.

As shown in FIGS. 4 (a), 4 (b) and 4 (c), a conventional signal cable 10 has a plurality of coaxial wires 1A wrapped in a skin 7 made of an insulating material such as vinyl chloride. It has a structure [see especially the sectional view taken along the line AA of FIG. 4 (b)].
On the other hand, each coaxial wire 1A wrapped in the skin 7 is a core wire 2 made of a material having a low electric resistance such as copper.
An inner skin 3 surrounding the core wire 2 (the inner skin 3 is made of, for example, polyethylene), and a shield layer 4 surrounding the outer peripheral surface of the inner skin 3 (the shield layer 4 is, for example, a copper wire or the like knitted in a mesh shape And a drain wire 6 along the shield layer 4 (this drain wire 6 is the shield layer 4 of the coaxial wire 1A).
Is arranged for connecting to a ground circuit (ground circuit) on the device side, and a twisted wire in which a plurality of copper wires are twisted together is used), and an outer skin 5 that encloses the outer peripheral surface of the shield layer 4. (This outer cover 5 is usually made of the same material as the outer cover 7) [see the sectional view taken along the line BB in FIG. 4 (c)].
Has been done.

The coaxial wire 1A includes a core wire 2 and a drain wire 6
Are mounted on the connector by respectively connecting to the pins on the connector side (not shown). At this time, the core wire 2 is put in a mountable state by peeling off the inner skin 3, and one drain wire 6 is put in an mountable state by covering an insulating tube 11 of an appropriate length. In the figure, 12 is a heat-shrinkable tube whose diameter shrinks when heated.

A conventional signal cable connection structure will be described below with reference to FIGS. 5 (a), 5 (b) and 5 (c). 5A, 5B, and 5C are diagrams supposing the case where the core wire 2 and the drain wire 6 of the coaxial wire 1A are mounted on the connector 60 held by the connector holder 61. In the figure, reference numeral 62 denotes a coaxial line accommodating groove provided on the connector holder 61 side, and 50 denotes a pressing plate that presses a plurality of coaxial wires 1 accommodated in the coaxial line accommodating groove 62 with screws 51.

As shown in FIGS. 5 (a), 5 (b) and 5 (c), in the conventional signal cable connection structure, the core wire 2 and the drain wire 6 are connected to a predetermined connector pin ( (Not shown) first, and then the coaxial cable 1A housed in the coaxial cable housing groove 62 is pressed as shown in FIG. 5 (b).
It is pressed by 50 and fixed to the connector holder 61.

[0007]

A conventional signal cable connection structure is a core wire 2 of each coaxial wire 1A and these coaxial wires 1.
The signal cable 10 is connected to the connector 60 by mounting the drain wires 6 along the shield layer 4 of A on the corresponding connector pins (not shown) on the side of the connector 60 (the mounting method is not specified). Is. Therefore, (1) the unit cost of the signal cable 10 is high because it is necessary to dispose the drain wire 6 corresponding to all the coaxial lines 1A constituting the signal cable 10. (2) The processing time becomes long (there is a risk of accidentally cutting the drain wire 6 when the shield layer 4 is processed, so this work requires a high level of skill and caution, and therefore takes time). . There were problems such as.

The present invention intends to realize the efficiency of the signal cable connecting work by adopting a cable structure in which a common ground plate is arranged instead of the drain wire provided for each shield layer.

[0009]

As shown in FIGS. 1 (a), (b), (c) and (d), a signal cable connection structure according to the present invention is a coaxial cable 1 which constitutes a signal cable 20. And a common ground plate 30 equipped with a ground wire 25 corresponding to the above, and the plurality of coaxial wires 1 from which the outer layer 5 is peeled off to expose the shield layer 4 and the shield layer 4 is pressed to the common ground plate. The common ground plate 30 is composed of a pressing plate 50 that is pressed against the 30
By pressing the plurality of coaxial wires 1 arranged so that the shield layers 4 are in contact with each other by the pressing plate 50, between the shield layers 4 of the plurality of coaxial wires 1 and the ground wire 25 of the common ground plate 30. It is characterized in that it is configured so that electrical conduction occurs.

[0010]

[Operation] The connection structure of this signal cable is a common ground plate.
A structure in which a plurality of coaxial wires 1 arranged so that the shield layer 4 is in contact with 30 are pressed by a pressing plate 50 to generate electrical conduction between the plurality of coaxial wires 1 and the common ground plate 30. Therefore, when this connection structure is applied, the drain line 6 (see FIGS. 4 and 5) becomes unnecessary.

[0011]

The present invention will be described in detail below with reference to the drawings of the embodiments. 1 (a), 1 (b), 1 (c) and 1 (d) are a schematic plan view of an essential part of an embodiment of the present invention, a cross-sectional view taken along the line DD and a schematic cross-sectional view of the main part, which are coaxial with each other. 2A and 2B are schematic cross-sectional views showing a structural example of a constituent member and a perspective view of a main part, and FIG.
(a) and (b) are schematic side sectional views of a main part showing a modified example of the present invention, and the same parts as those in FIGS. 4 and 5 are designated by the same reference numerals.

As shown in FIGS. 1 (a), 1 (b), 1 (c) and 1 (d), the connection structure of a signal cable according to the present invention (hereinafter referred to as a cable connection structure) is a coaxial cable which constitutes a signal cable 20. A common ground plate 30 equipped with a ground wire 25 having a number of wires substantially corresponding to the number of wires 1 and the plurality of coaxial wires 1 having the shield layer 4 exposed by removing the outer cover 5 are pressed. A pressing plate 50 for pressing the shield layer 4 against the common ground plate 30.
Is the main component.

That is, in this cable connection structure, the plurality of coaxial wires 1 arranged so that the shield layer 4 is brought into contact with the common ground plate 30 is pressed by the pressing plate 50, so that This is a structure that causes electrical conduction between the shield layer 4 and the ground line 25 on the common ground plate 30 side.

The common ground plate 30 has a plurality of coaxial wires 1.
By making a common contact with the shield layer 4 of FIG. Therefore, if this common ground plate 30 is used, a plurality of coaxial wires 1
It is possible to collectively form the ground circuit. In addition,
The number of ground lines 25 connected to the common ground plate 30 is usually determined according to the number of ground pins (connector pins connected to the ground circuit) not shown provided on the connector 60 side. The current capacity of the line 25, the number of lines, the arrangement position, etc. are not specified.

In this cable connection structure, the pressing plate 50 is used to connect the coaxial wire 1 and the common ground plate 30 to the structure shown in FIGS. 1 (a) and 1 (b).
After pressing the coaxial wire 1 and the common ground plate 30 to the connector holder 61 by pressing as shown in (c), connect each core wire 2 and each ground wire 25 to the corresponding connector pins on the connector 60 side. The signal cable connection process is completed by.

In this cable connection structure, the shield layer 4 of the coaxial line 1 is connected via the ground line 25 connected to the common ground plate 30 which is in common contact with the shield layer 4 of the coaxial line 1.
Since the structure is such that electrical conduction is generated between the connector 60 and the connector 60, it is not necessary to previously arrange the drain wire 6 along the shield layer 4 unlike the conventional coaxial wire 1A shown in FIG. Therefore, by applying this structure, the structure of the coaxial cable 1 forming the signal cable 20 is remarkably simplified as shown in FIG. 1 (d).

The structure of the main constituent member (common ground plate 30) will be described below with reference to FIGS. 2 (a) and 2 (b). As shown in FIGS. 2 (a) and 2 (b), the common ground plate 30 has a main body portion 31 made of a rectangular thin plate made of a material having good conductivity (such as a copper plate), and the coaxial wire 1 has a wire. The number of the ground lines 25 (the number of the ground lines 25 is not specified) that is substantially the same as the number is mounted by, for example, soldering or crimping. Although the thickness of the common ground plate 30 is not specified, it is set to about 0.3 mm in this embodiment. In the embodiment disclosed in FIGS. 2 (a) and 2 (b), the ground wire 25 is mounted on only one side of the main body 31, but when the ground wire 25 is mounted on both front and back sides of the main body 31. Of course it is possible.

The connection structure of the signal cable according to the present invention is
A grounding circuit for each coaxial line 1 is centralized through a common grounding plate 30 that makes electrical contact with the shield layer 4 of each coaxial line 1 by contacting the shield layer 4 of each coaxial line 1. Since the structure is formed as described above, it is not necessary to arrange the drain wire 6 corresponding to each coaxial wire 1, so that the manufacturing cost of the signal cable 20 is significantly reduced.

FIGS. 3 (a) and 3 (b) are schematic side sectional views showing a modification of the present invention. In these two modifications, the shield layer 4 of the coaxial line 1a is used as it is as the ground line 25 in FIG. 3 (a). In this case, there are various means for separating the shield layer 4 and the core wire 2. However, generally used is that the shield layer 4 is composed of a braided wire. This is a method of expanding a part of the mesh and pulling out the core wire 2 covered with the inner skin 3 from there.

In this modification, a white tube 72 is attached to the core wire 2 in order to easily distinguish the core wire 2 from the ground wire 25.
A black tube 71 is covered on the ground wire 25 formed by twisting the shield layer 4 together. When this modification is applied, since the drain wire 6 (see FIGS. 4 and 5) arranged along the shield layer 4 is unnecessary, the signal cable 20 having the same structure as that of the above-described embodiment (see FIG. 1) is obtained. Can be used.

FIG. 3B shows a case where the shield layer 4 of the coaxial wire 1b and a pin (not shown) on the connector side are connected by using a connecting member called a crimp contact 75. This crimping contact 75 covers the shield layer 4 of the coaxial wire 1b with a crimped portion 77 provided at one end and tightens it with a known crimping tool to establish continuity between the shield layer 4 and the crimping contact 75. Give birth. The other end of the crimp contact 75 is connected to a pin (not shown) on the connector side by using the crimp tool or the like. Since this modification does not require the drain wire 6 arranged along the shield layer 4, the signal cable 20 having the same structure as that of the modification (see FIG. 3 (a)) can be used, which is economical. is there.

[0022]

As is apparent from the above description, the signal cable connection structure according to the present invention has a cable structure in which a common ground plate is arranged instead of the drain wire provided for each shield layer. Therefore, the work of connecting the signal cable is significantly more efficient than in the past. Therefore, the economic effect of applying this signal cable connection structure is extremely large.

[Brief description of drawings]

FIG. 1 is a schematic plan view of an essential part showing an embodiment of the present invention, a cross-sectional view taken along the line DD, a schematic cross-sectional view of a main part and a cross-sectional view of a coaxial line.

2A and 2B are a schematic plan view and a perspective view of an essential part showing one structural example of a constituent member.

FIG. 3 is a schematic cross-sectional side view of essential parts showing a modified example of the present invention.

FIG. 4 is a schematic cross-sectional view of a main part, a cross-sectional view taken along the line AA, and a cross-sectional view taken along the line BB of a conventional signal cable.

5A and 5B are a schematic plan view of a main part, a cross-sectional view taken along the line C-C and a cross-sectional view of the main part showing a conventional connection structure of a signal cable.

[Explanation of symbols]

 1, 1a, 1b, 1A Coaxial wire 2 Core wire 3 Inner skin 4 Shield layer 5 Outer skin 6 Drain wire 7 Outer skin 10, 20 Signal cable 11 Insulation tube 12 Heat shrink tube 25 Ground wire 30 Common ground plate 31 Body part 50 Press plate 51 Screw 60 Connector 61 Connector holder 62 Coaxial wire receiving groove 71 Black tube 72 White tube 75 Crimp contact 77 Caulking section

Claims (1)

[Claims] 1. A coaxial wire (1) constituting a signal cable (20).
Common ground plate equipped with ground wire (25) corresponding to
(30) and the shield layer (4) is peeled off to expose the shield layer (4).
(4) is composed of a pressing plate (50) that press-contacts the common ground plate (30), and the plurality of coaxial cables arranged so that the shield layer (4) contacts the common ground plate (30). Connect the wire (1) to the pressing plate (50)
A connection structure for a signal cable, characterized in that electrical connection is generated between the shield layer (4) of the plurality of coaxial wires (1) and the ground wire (25) by pressing with.