JP3858034B2 - Terminal for cable - Google Patents

Description

  The present invention relates to a crimping part (for example, an outer conductor crimping part) to be crimped to an end of a cable (for example, a coaxial cable), and a fitting part main body (for example, a shell body) connected to the crimping part via a connecting part. And a cable terminal (for example, a coaxial cable terminal).

  For example, as shown in FIG. 7A, the conventional coaxial cable terminal 100 includes an insulating outer cover crimping portion 103 for crimping an insulating outer sheath (sheath) 3 of the coaxial cable 1 and an outer conductor crimping portion for crimping the outer conductor 5. 105 and a shell main body 109 integrally connected to the outer conductor crimping portion 105 via a connecting portion 107.

  The shell main body 109 is formed in a substantially cylindrical shape, and a substantially cylindrical insulator 111 for holding an internal terminal (not shown) is inserted and fixed therein, and the internal terminal is a core wire (center conductor) of the coaxial cable 1. 7 is electrically connected.

  When the shell main body 109 is mounted in a coaxial connector (not shown) and this coaxial connector is fitted and connected to the mating connector, the coaxial cable 1 has its outer conductor 5 connected to the outer conductor crimping portion 105 and the connecting portion 107. And through the shell main body 109, it is grounded via the ground terminal of the mating connector and electromagnetically shielded.

However, in the conventional example shown in FIG. 7 (a), since there is one connecting portion 107 (one place) for connecting the crimping portion 105 and the shell body 109, as shown in the following (1) and (2). There was a serious problem.
(1) Since the connecting portion 107 that connects the crimping portion 105 and the shell main body 109 is one place, there is a disadvantage that mechanical strength such as bending or bending is weak.
For example, when the crimping portions 103 and 105 receive an external force F of a predetermined value (for example, 7.5 N (Newton) or more) in the direction indicated by an arrow in FIG. 7A, there is a disadvantage that the crimping portions 103 and 105 are deformed as shown in FIG. there were.
(2) The connecting portion 107 that connects the crimping portion 105 and the shell main body 107 plays the role of grounding the coaxial cable 1, and since there is only one connecting portion 107, the high-frequency performance is deteriorated. .
For example, a high frequency signal of 5 GHz has a drawback that VSWR (voltage standing wave ratio) deteriorates (for example, VSWR = 1.6).
Such deterioration of the high-frequency performance was further exacerbated when there was a deformation as shown in FIG.

The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a cable terminal capable of improving mechanical strength such as twisting and bending.
Another object of the present invention is to provide a cable terminal capable of improving high-frequency performance.

The invention according to claim 1 is a fitting part main body formed in a substantially cylindrical shape, at least two connecting parts having different lengths formed at one end of the fitting part main body at substantially equal intervals, and these The first and second crimping portions sequentially provided on the connecting portion having the short length, and the third crimping portion provided on the distal end side of the connecting portion having the long length . The first crimping part is shaped to crimp the long connecting part together with the cable from the outside, and the third crimping part is shaped to crimp the second crimping part from the outside together with the cable .

The invention according to claim 2 is characterized in that two connecting portions are provided at the end of the fitting portion main body in the axial direction and at two intervals of approximately 180 degrees .

The invention according to claim 3 is a fitting portion main body formed in a substantially cylindrical shape, and extends in the axial direction to the fitting portion main body, and the length is sequentially increased at intervals of about 120 degrees. The first, second, and third connecting portions provided, and the first, second, and third crimping portions provided on the respective distal ends of the first, second, and third connecting portions, The first crimping portion is shaped to crimp the second and third connecting portions together from the cable, and the second crimping portion is shaped to crimp the third connecting portion together from the cable, the third The crimping portion is characterized by having a shape for crimping the cable .

The invention according to claim 4 is characterized in that the fitting portion main body, the connecting portion, and the crimping portion have an integral structure integrally formed of a conductive metal plate .

The invention according to claim 5 is characterized in that the fitting portion main body, the connecting portion, and the crimping portion have a combined structure in which a plurality of components formed of a conductive metal plate are engaged and connected .

The invention according to claim 1 is a fitting part main body formed in a substantially cylindrical shape, at least two connecting parts having different lengths formed at one end of the fitting part main body at substantially equal intervals, and these The first and second crimping portions sequentially provided on the connecting portion having the short length, and the third crimping portion provided on the distal end side of the connecting portion having the long length . The first crimping part is shaped to crimp the long connecting part together with the cable from the outside, and the third crimping part is shaped to crimp the second crimping part from the outside together with the cable. Compared with the conventional example which has been used, mechanical strength such as bending and bending, high frequency performance, and shielding effect can be improved.

According to the second aspect of the present invention, since the two connecting portions extend in the axial direction at the end of the fitting portion main body and are provided at an interval of approximately 180 degrees, the connecting portions serving as the grounding portions are arranged in a balanced manner. In addition, mechanical strength such as twisting and bending, high frequency performance, and shielding effect can be further improved.

The invention according to claim 3 is a fitting portion main body formed in a substantially cylindrical shape, and extends in the axial direction to the fitting portion main body, and the length is sequentially increased at intervals of about 120 degrees. The first, second, and third connecting portions provided, and the first, second, and third crimping portions provided on the respective distal ends of the first, second, and third connecting portions, The first crimping portion is shaped to crimp the second and third connecting portions together from the cable, and the second crimping portion is shaped to crimp the third connecting portion together from the cable, the third Since the crimping part is shaped to crimp the cable, the external force applied to the compression part from various directions should be distributed in a balanced manner. The mechanical strength against twisting and bending can be improved.

In the invention according to claim 4, since the fitting portion main body, the connecting portion, and the crimping portion are integrally formed of a conductive metal plate , the mechanical strength can be further improved.

In the invention according to claim 5, since the fitting portion main body, the connecting portion, and the crimping portion have a combined structure in which a plurality of components formed of conductive metal plates are engaged and connected, the structure of the crimping portion and the connecting portion is provided. However, it is possible to easily cope with complicated cable terminals.

1 and 2 show an embodiment of a cable terminal according to the present invention. Specifically, an example of a coaxial cable terminal in which the cable is a coaxial cable is shown.
In FIG. 1, reference numeral 1 denotes a coaxial cable as an example of a cable. The coaxial cable 1 includes a core wire 7, an insulator 9 that sequentially coats the outer periphery of the core wire 7 in a concentric manner, an outer conductor 5, and an insulating sheath 3. The characteristic impedance is 75Ω (or 50Ω), the tip of the core wire 7 protrudes for connection, and the tip of the external conductor 5 is exposed for crimping.

1 and 2, reference numeral 10 denotes a coaxial cable terminal (or a coaxial cable shield terminal).
The coaxial cable terminal 10 is formed in an integral structure by punching, bending or the like of a conductive metal plate. The shell main body 20 is an example of a fitting portion main body formed in a substantially cylindrical shape, and the shell main body. 20 has a crimping portion 40 integrally connected to an end edge of one side (left side in FIGS. 2A and 2B) via a connecting portion 30.

  In the outer peripheral part of the other side of the shell body 20 (right side in FIGS. 2A and 2B), slits 21 to 21 for giving elasticity in the radial direction and bulging portions 23 to bulge inward are provided. 23 is formed.

The connecting portion 30 includes a first connecting portion 31 formed in a substantially square plate shape and a second connecting portion 32 formed in a substantially horizontally long rectangular plate shape with the central axis direction of the shell body 20 as a longitudinal direction. .
The first and second connecting portions 31 and 32 are intersecting points (K) whose end surfaces intersect the central axis of the shell body 20 at the edge of one side of the shell body 20 (left side in FIGS. 2A and 2B). ) At a position that divides the central angle into two equal parts (two equal parts at a central angle of 180 degrees) and extends obliquely inward.

  The crimping part 40 is connected to the distal end side of the first coupling part 31 on the distal end side of the first crimping part 41, the second crimping part 42, and the second coupling part 32 that are sequentially coupled along the central axis direction of the shell body 20. It consists of the 3rd crimping | compression-bonding part 43 connected along the center axis direction of the shell main body 20. FIG.

The first crimping portion 41 has a substantially circular cross section perpendicular to the central axis of the shell body 20 and a gap 45 at the tip.
Each of the second and third pressure-bonding parts 42 and 43 has a cross section perpendicular to the central axis of the shell body 20 that is substantially arc-shaped and substantially U-shaped.
The gap 45 of the first crimping portion 41 is formed on the side of the first crimping portion 41 that faces the side that is connected to the first connecting portion 31.
The semi-circular portion of the third crimping portion 43 and the second crimping portion 42 are formed so as to be positioned on substantially the same cylinder with the inner wall surface facing each other and with the central axis of the shell body 20 as a common central axis.
On the wall surfaces of the first, second, and third crimping portions 41, 42, and 43, bulging portions 46, 47, 47, 48, and 48 that bulge inward are formed.

Then, as in the conventional example, an internal terminal (not shown) is connected to the core wire 7 of the coaxial cable 1, and this internal terminal is inserted and held in the accommodation hole of the insulating housing 111 mounted in the shell body 20. Thereafter, the first, second, and third crimping portions 41, 42, and 43 are caulked with a crimping machine, as shown in FIGS. 3 (a) and 3 (b). , 42, 43 are crimped and fixed to the outer conductor 5 of the coaxial cable 1 and are electrically and mechanically connected.
At this time, the first crimping portion 41 is crimped to the outer conductor 5 of the coaxial cable 1, and the second and third crimping portions 42 and 43 are crimped to the insulating sheath 3 and the outer conductor 5 of the coaxial cable 1. For this reason, when the shell body 20 is mounted in a coaxial connector (not shown) and this coaxial connector is fitted and connected to the mating connector, the outer conductor 5 of the coaxial cable 1 is connected to the first, second, and third crimps. The parts 41, 42, 43, the first and second connecting parts 31, 32, and the shell body 20 are grounded through the ground terminal of the mating connector and electromagnetically shielded.

  As described above, the connecting portion 30 that connects the shell body 20 and the crimping portion 40 is formed by the two connecting portions 31 and 32, and the two connecting portions 31 and 32 are as shown in FIG. Since it is formed at a position that divides the central angle around the intersection K into two equal parts (two equal parts with a central angle of 180 degrees), the external force applied to the crimping part 40 is distributed in a well-balanced manner and mechanical against bending, bending, etc. In addition to improving the strength, it is possible to improve the high-frequency performance (or shielding effect) by arranging the connecting portions 31 and 32 serving as the grounding portions in a balanced manner.

According to the comparative experiment, when the invention shown in FIGS. 3 (a) and 3 (b) is compared with the conventional product shown in FIG. 7 (a), the mechanical strength is different as shown in FIG. 3 (c). There is a difference as shown in FIG. 4 regarding the high-frequency performance, and the inventive product is superior to the conventional product.
That is, as shown in FIGS. 3A, 3B, and 3C, the average strength of the product in the A direction (cable pulling direction) is 70.0 N (Newton), whereas the average strength of the conventional product. Is 57.0N, and in the B and C directions (cable twisting direction), the average strength of the invention is 90.0N and 35.0N, while the average strength of the conventional product is 7.5N and 13.5N. Met.
As for the high frequency performance, as shown by the characteristic curve of the solid line H (invention product) and the dotted line J (conventional product) in FIG. 4, the invention product has a frequency of 5 in the relationship between VSWR (voltage standing wave ratio) and frequency. While the VSWR is 1.3 or less up to .5 GHz, the conventional product has a VSWR of 1.3 at a frequency of 3 GHz, and the VSWR is 1.7 or more at a frequency of 5.5 GHz.
In addition, both the invention product and the conventional product in the comparative experiment described above are formed by punching, bending or the like of a conductive metal plate having a plate thickness of about 0.3 mm, and the total length in the axial direction is about 19 mm. 109 has an outer diameter and an axial length of about 4 mm and 12 mm.

In the above-described embodiment, the case where the connecting portion is formed by two pieces and the crimping portion is formed by three pieces is explained. However, the present invention is not limited to this, and the central angle with the intersection point K as the center is roughly divided into n. The number of connecting parts is n (n is an integer of 2 or more) and the number of crimping parts is m (m is an integer of n or more) or p (p is a positive integer less than n). it can.
For example, the case where n = 3 and m = 3 can also be used, and FIGS. 5A and 5B show an example.

  5 (a) and 5 (b), 50 is a coaxial cable terminal, and this coaxial cable terminal 50 is formed into an integral structure by punching, bending or the like of a conductive metal plate, and is formed in a substantially cylindrical shape. A shell main body 60 as an example of the fitting portion main body, and a crimping portion 80 integrally connected to an edge of one side of the shell main body 60 (left side in FIG. 5A) via a connecting portion 70 are provided. is doing.

The connecting portion 70 includes first, second, and third connecting portions 71, 72, and 73 that are formed in a horizontally-long rectangular plate shape in which the length in the longitudinal direction is sequentially longer with the central axis direction of the shell body 60 as the longitudinal direction. ing.
The first, second, and third connecting portions 71, 72, and 73 are intersections at the end edges of one side of the shell body 60 (left side in FIG. 5A) whose end surfaces intersect the center axis of the shell body 60. They are connected at a position that divides the central angle around K into three equal parts (three equal parts with a central angle of 120 degrees) and extends obliquely inward.

The crimping portion 80 includes first, second, and third crimping portions 81, 82, and 83 that are coupled to the respective distal ends of the first, second, and third coupling portions 71, 72, and 73. The second and third crimping portions 81, 82, and 83 are formed so as to extend from the distal end side of the shell body 60 toward the central axis and not overlap each other.
Each of the first, second, and third crimping portions 81, 82, and 83 has a substantially U-shaped cross section perpendicular to the central axis of the shell body 60, and a bulging portion that bulges inward on the wall surface. 86, 87, 88 are formed.

In the embodiment, in order to improve the mechanical strength, the crimping part (for example, 40 or 80), the fitting part main body (for example, 20 or 60) and the n connecting parts (for example, 31 and 32 or 71 to 73) are provided. The case of the integrated structure formed integrally by processing the conductive metal plate has been described, but the present invention is not limited to this, and a plurality of components formed individually by processing the conductive metal plate are engaged. It can also be used in the case of a combined combination structure.
For example, as shown in FIGS. 6 (a), (b), and (c), two component parts 20A and 20B in which the shell body 20 engages and connects the engaging protrusions 28A and 28B and the engaging recesses 29A and 29B. The first and second crimping portions 41 and 42 are integrally connected to one component 20A via the first connecting portion 31, and the third component 20B is connected to the other component 20B via the second connecting portion 32. The case where the crimping part 43 is integrally connected can also be used. In this case, a coaxial cable terminal having a complicated structure of the crimping part and the connecting part can be easily handled.

  In the said Example, n connecting parts (for example, 31 and 32, or 71-73) are n, etc. with the center angle centering on the intersection K at the edge of the one side of a fitting part main body (for example, 20 or 60). Although the case where it connected with the position (for example, n is 2 or 3) was demonstrated, this invention is not limited to this, n connection part is the intersection K on the edge of the one side of a fitting part main body. It is also possible to use a case where the central angle with respect to is connected to a position where the central angle is not equally divided into n. Even in this case, since there are a plurality of connecting portions as compared with the conventional example having one connecting portion, the mechanical strength and the high-frequency performance can be improved.

In the above embodiment, the case where the cable is a coaxial cable having a characteristic impedance of 75Ω (or 50Ω) (that is, the case of a coaxial cable terminal) has been described, but the present invention is not limited to this, and the characteristic impedance is 75Ω (or 50Ω). In the case of a coaxial cable other than), it can also be used for a shielded cable or an electric wire.
For example, the inner and outer conductors that make up the cable are not coaxial, but the inner conductor (for example, a two-core wire made of two insulated wires twisted together) is covered with an outer conductor such as metal foil or metal braid. It can also be used in the case of a shielded cable that is not subject to noise interference from the outside (that is, in the case of a shielded cable terminal).
In the case of this shielded cable terminal, the mechanical strength at the connecting portion with the shielded cable can be improved and the electromagnetic shielding effect can be improved as in the case of the coaxial cable terminal.
Moreover, in the case of the terminal for electric wires which used the cable as the electric wire (For example, the general purpose electric wire which coat | covered the circumference | surroundings of the conductor with the insulator), the mechanical strength in the connection part with an electric wire can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of a cable terminal according to the present invention, partly cut away and partly omitted. 1 shows a coaxial cable terminal 10 in FIG. 1, (a) is a plan view, (b) is a front view, and (c) is a left side of (a). In FIG. 1, it is a figure which shows the external appearance and mechanical characteristic of the invention which crimped and connected the crimping | compression-bonding part 40 of the terminal 10 for coaxial cables to the edge part of the coaxial cable 1, (a) is a front view, (b) is a top view (C) is the strength comparison figure which compared the average intensity | strength when external force is each applied in the A and B direction in (a), and the C direction in (b) compared with the conventional product of FIG. FIG. 8 is a high-frequency performance comparison diagram showing the frequency and VSWR characteristics of the invention shown in FIGS. 3A and 3B in comparison with the conventional product of FIG. It is a figure which shows another Example, (a) is a top view, (b) is a left view of (a). Furthermore, it is a figure which shows another Example, (a) is a top view, (b) is a front view, (c) is a rear view. It is a figure which shows a prior art example, (a) is a front view, (b) is a figure which shows the state which received the external force F in (a) and the terminal 100 for coaxial cables deform | transformed.

Explanation of symbols

1 ... Coaxial cable (an example of a cable)
5. External conductor
10, 50 ... Coaxial cable terminal (an example of a cable terminal) 20, 60 ... Shell body (an example of a fitting part body)
30, 70 ... connecting part 31, 71 ... first connecting part 32, 72 ... second connecting part 40, 80 ... crimping part
41, 81 ... first crimping part 42, 82 ... second crimping part 43, 83 ... third crimping part 73 ... third connecting part K ... intersection

Claims (5)

A fitting portion main body formed in a substantially cylindrical shape, at least two connecting portions having different lengths formed at one end of the fitting portion main body at substantially equal intervals, and a connecting portion having a short length among them Each of the first and second crimping portions sequentially provided, and a third crimping portion provided on the distal end side of the connecting portion having a long length , and the first crimping portion is connected to the cable together with the cable. A cable terminal characterized in that a long connecting portion is shaped to be crimped from the outside, and the third crimping portion is shaped to crimp the second crimping portion from the outside together with the cable. 2. The cable terminal according to claim 1 , wherein two connecting portions are provided at an end portion of the fitting portion main body in the axial direction and at two intervals of approximately 180 degrees . A fitting portion main body formed in a substantially cylindrical shape, and first and second portions provided on the fitting portion main body so as to extend in the axial direction and become longer sequentially at intervals of about 120 degrees. And a third connecting portion, and first, second and third crimping portions provided on the respective distal ends of the first, second and third connecting portions, the first crimping portion being a cable In addition, the second and third connecting portions are shaped to be crimped from the outside, the second crimping portion is shaped to crimp the third connecting portion together with the cable, and the third crimped portion is crimped to the cable. Cable terminal characterized by its shape . 4. The cable terminal according to claim 1 , wherein the fitting part main body, the connecting part, and the crimping part have an integral structure integrally formed of a conductive metal plate . 4. The cable terminal according to claim 1 , wherein the fitting portion main body, the connecting portion, and the crimping portion have a combined structure in which a plurality of components formed of a conductive metal plate are engaged and connected. .

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