CN100394650C - Cable terminal - Google Patents

Abstract

The coaxial cable terminal of the present invention has a crimping part (40), a case main body (20) and a connecting part (30), the connecting part (30) is formed by a plurality of connecting parts (31, 32), and the The crimping part (40) and the case main body (20) are connected. An object of the present invention is to improve mechanical strength such as torsion or bending in the terminal for a coaxial cable of the present invention, and to improve high-frequency performance.

Description

Cable terminal

technical field

The present invention relates to a terminal for a cable (for example, a terminal for a coaxial cable), which has: The fitting part main body (for example, the case main body) provided continuously with the crimping part.

Background technique

Existing terminal 100 for coaxial cables is for example shown in Fig. 7 (a), is formed by the following parts: the insulating sheath crimping part 103 that crimps the insulating sheath (sheath) 3 of coaxial cable 1, crimping The outer conductor crimping portion 105 of the outer conductor 5 , and the case main body 109 provided integrally and continuously with the outer conductor crimping portion 105 via the connecting portion 107 .

The case main body 109 is formed in a substantially cylindrical shape, and a substantially cylindrical insulator 111 holding an internal terminal (not shown in the figure) that is connected to the core wire (center conductor) of the coaxial cable 1 is inserted and fixed inside it. 7 electrical connections.

The shell main body 109 is installed in a coaxial connector (not shown in the figure). If the coaxial connector is fitted and connected to a matching connector, the outer conductor 5 of the coaxial cable 1 passes through the outer conductor crimping part. 105 , the connecting portion 107 and the case main body 109 are grounded through the grounding terminal of the matching connector, thereby being electromagnetically shielded.

However, the prior art example shown in FIG. 7(a) has one connection part 107 (one place) for connecting the crimping part 105 and the case main body 109, so it has the following (1), (2) question.

(1) Since there is one connecting portion 107 connecting the crimping portion 105 and the case main body 109 , mechanical strength such as twisting or bending is weak.

For example, when the crimping parts 103 and 105 receive an external force F of a predetermined value (for example, 7.5 N (Newton)) in the direction indicated by the arrow in FIG. out of shape.

(2) The connecting portion 107 connecting the crimping portion 105 and the case main body 109 serves as a ground for the coaxial cable 1, and since this connecting portion 107 exists only at one place, the high-frequency performance deteriorates.

For example, for a high frequency signal of 5 GHz, there is a disadvantage that VSWR (Voltage Standing Wave Ratio) deteriorates (for example, VSWR=1.6).

If deformation as shown in FIG. 7( b ) occurs, such high-frequency performance will be further deteriorated.

Contents of the invention

The present invention has been made in view of the above problems, and an object of the present invention is to provide a cable terminal capable of improving mechanical strength such as torsion or bending.

Another object of the present invention is to provide a cable terminal capable of improving high-frequency performance.

The cable terminal according to claim 1 is characterized in that it includes a cylindrical fitting body, at least two connecting parts with different lengths formed at equal intervals on one end of the fitting body, The first and second crimping parts respectively provided in sequence on the connecting part with short length, and the third crimping part provided at the front end side of the long connecting part, the first crimping part forms the above-mentioned crimping part from the outside. The long connecting portion is shaped to be crimped together with the cable, and the third crimping portion is formed to face the inner wall surface of the second crimping portion and to crimp the cable together with the second crimping portion.

The cable terminal according to claim 2 is characterized in that, in the cable terminal according to claim 1, the connecting portion extends in the axial direction at the end of the fitting portion main body and is provided at intervals of approximately 180°. two.

The cable terminal according to claim 3 is characterized in that it includes a cylindrical fitting part main body, and the fitting part main body extends in the axial direction and increases in length at approximately 120° intervals. The first, second, and third connecting parts that are arranged in a grounded manner, the first, second, and third crimping parts that are respectively arranged on the front end side of the first, second, and third connecting parts, and the first crimping part The second and third connection parts are formed into a shape of crimping the cable together from the outside, the second crimping part is formed into a shape of crimping the third connection part and the cable from the outside, and the third crimping part is formed into a shape of crimping the cable together from the outside. form the shape of the crimped cable.

The cable terminal according to Claim 4 is characterized in that in the cable terminal according to Claim 1, 2, or 3, the fitting part main body, the connecting part, and the crimping part are integrally formed by a conductive metal plate. One-piece structure.

The cable terminal according to claim 5 is characterized in that in the cable terminal according to claim 1, 2 or 3, the fitting part main body, the connecting part and the crimping part are snap-connected by a conductive metal plate The combined structure of multiple constituent parts formed.

Invention effect

According to the present invention, in the cable terminal having the crimping part, the fitting part main body, and the connecting part, since the connecting part is formed by a plurality of connecting parts, the crimping part and the fitting part are connected at a plurality of places. Therefore, compared with the conventional example that connects at one place, the mechanical strength such as torsion or bending can be improved.

According to the present invention, since the cable is a coaxial cable, and the crimping portion is an outer conductor crimping portion that crimps the outer conductor of the coaxial cable, in the terminal for a coaxial cable, the same is performed at one place. High-frequency performance can be improved compared to the conventional example of connection.

According to the present invention, since the cable is a shielded cable, and the crimping portion is a shielded wire crimping portion for crimping the shielded wire of the shielded cable, in the terminal for a shielded cable, the present invention that is connected at one place Compared with other examples, the shielding effect can be improved.

According to the present invention, since the fitting part main body is formed in a substantially cylindrical shape, n connecting parts are connected to the end edge of the fitting part main body at positions obtained by dividing the central angle into n equal parts, and the central angle is defined as an intersection point. Center, so the external force applied to the crimping part from various directions can be dispersed in a well-balanced degree, and the mechanical strength such as torsion or bending can be improved.

Also, when applied as a terminal for a coaxial cable or a terminal for a shielded cable, since the n connection parts serving as ground parts are arranged with a good balance, the high frequency performance and shielding effect can be further improved.

According to the present invention, since the crimping portion, the fitting portion main body, and the n connecting portions are integrally formed by processing the conductive metal plate, the mechanical strength can be further improved.

According to the present invention, since the crimping part, the fitting part main body, and the n connecting parts are configured to engage and connect a plurality of components formed individually by processing a conductive metal plate, thereby combining them together, Therefore, even a cable terminal having a complicated structure of the crimping portion and the connecting portion can be easily handled.

According to the present invention, since the crimping portion is formed of m (m is an integer greater than n) crimping portions including one crimping portion connected to each of n connection portions, The crimping part has more crimping parts than the connecting part with respect to the cable, so that the mechanical strength and high frequency performance (or shielding effect) can be improved.

According to the present invention, since the crimping portion is formed by p (p is a positive integer smaller than n) crimping portions, the p crimping portions include one crimping portion connected to at least two of the n connecting portions. Therefore, the crimping part of the crimping part relative to the cable is less than the connecting part of the connecting part, which can improve the mechanical strength or high frequency performance (or shielding effect).

Description of drawings

Fig. 1 shows one embodiment of the cable terminal of the present invention, and is a perspective view in which a part is cut away and a part is omitted.

Fig. 2 shows the coaxial cable terminal 10 in Fig. 1 , (a) is a plan view, (b) is a front view, and (c) is a left side view of (a).

3 is a diagram showing the appearance and mechanical properties of an inventive sample formed by crimping the crimping portion 40 of the terminal 10 for the coaxial cable in FIG. 1 to the end of the coaxial cable 1, (a ) is a front view, (b) is a top view, (c) is a strength comparison diagram obtained by comparing the average strength with the existing product in Figure 7, and the average strength is when an external force is applied along the A and B directions in (a) , the average strength when an external force is applied along the C direction in (b).

Fig. 4 is a comparison chart of high-frequency performance obtained by comparing the frequency and VSWR characteristics of the inventive sample shown in Fig. 3(a) (b) with the conventional product shown in Fig. 7 .

Fig. 5 is a diagram showing another embodiment, (a) is a plan view, and (b) is a left side view of (a).

It is a figure which shows still another Example, (a) is a top view, (b) is a front view, (c) is a rear view.

7 is a view showing a conventional example, (a) is a front view, and (b) is a view showing a state in which the coaxial cable terminal 100 is deformed by an external force F in (a).

Detailed ways

1 and 2 show an embodiment of the cable terminal of the present invention. Specifically, an example of a terminal for a coaxial cable when a coaxial cable is used as the cable is shown.

In FIG. 1 , 1 is a coaxial cable as an example of a cable, and this coaxial cable 1 is formed of the following components: a core wire 7 , and an insulator 9 that sequentially covers the outer periphery of the core wire 7 in a concentric circle. 1. The outer conductor 5 and the insulating sheath 3 have a characteristic impedance of 75Ω (or 50Ω), the front end of the core wire 7 protrudes for connection, and the front end of the outer conductor 5 is exposed for crimping.

In FIGS. 1 and 2 , 10 is a terminal for a coaxial cable (or a shield terminal for a coaxial cable).

The terminal 10 for a coaxial cable is formed into an integral structure by punching, bending, etc. of a conductive metal plate, and has a case main body 20 as an example of a fitting part main body formed in a substantially cylindrical shape, and a via connection part 30 . The crimping portion 40 is integrally connected to the end edge of one side (the left side in FIG. 2( a ) and (b)) of the case main body 20 .

Slits 21-21 and bulging parts 23-23 bulging inward are formed on the outer peripheral portion of the other side (the right side in FIG. 2(a)(b)) of the case main body 20. The slits 21 - 21 make the shell body 20 elastic in the radial direction.

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 laterally long rectangular plate shape with the central axis direction of the case body 20 as the longitudinal direction.

The first and second connecting parts 31, 32 are connected to the end edge of the case main body 20 side (left side in FIG. The central angle) is centered on the intersection point K where the end face of the side edge of the case main body 20 intersects with the central axis of the case main body 20 and extends obliquely inwardly.

The crimping part 40 includes: a first crimping part 41 and a second crimping part 42 sequentially connected to the front end side of the first connecting part 31 along the central axis direction of the case main body 20; The third crimping portion 43 is connected to the front end side of the second connecting portion 32 in the axial direction.

The first crimping portion 41 has a substantially circular cross-section perpendicular to the central axis of the case body 20 and has a gap 45 at its tip.

The second and third crimping portions 42 and 43 are respectively formed in substantially arc-shaped and substantially U-shaped cross sections perpendicular to the central axis of the case body 20 .

The gap 45 of the first crimping portion 41 is formed on the side of the first crimping portion 41 opposite to the side connected to the first connecting portion 31 .

The semicircular portion of the third crimping portion 43 and the second crimping portion 42 are formed so that their inner wall surfaces face each other, and are positioned on substantially the same cylinder with the central axis of the case main body 20 as a common central axis.

On the wall surfaces of the first, second, and third crimping portions 41 , 42 , 43 , bulging portions 46 , 47 , 47 , 48 , 48 that bulge inward are formed.

Then, an internal terminal (not shown) is connected to the core wire 7 of the coaxial cable 1 in the same manner as in the conventional example, and the internal terminal is inserted and held in the receiving hole of the insulating cover 111 installed in the case main body 20. . Thereafter, the first, second, and third crimping portions 41, 42, and 43 are pressurized and fastened by using a crimping machine, as shown in Fig. 3(a), (b), the first, second, and third 3. The crimping parts 41, 42, 43 are crimped and fixed on the outer conductor 5 of the coaxial cable 1, and both are electrically and mechanically connected.

At this time, the first crimping part 41 is crimped on the outer conductor 5 of the coaxial cable 1, and the second and third crimping parts 42 and 43 are crimped on the insulating sheath 3 of the coaxial cable 1 and the outer conductor 5. superior. Therefore, the shell main body 20 is installed in a coaxial connector (not shown in the figure), and if the coaxial connector is fitted and connected to a matching connector, the outer conductor 5 of the coaxial cable 1 passes through the first, The second and third crimping parts 41 , 42 and 43 , the first and second connecting parts 31 and 32 , and the case main body 20 are grounded through the ground terminals of the mated connectors, thereby being electromagnetically shielded.

As mentioned above, the connection part 30 connecting the case main body 20 and the crimping part 40 is formed by two connection parts 31, 32, and the two connection parts 31, 32 are shown in FIG. Since the intersection point K is the position where the central angle is bisected (the central angle is bisected by 180 degrees), the external force applied to the crimping part 40 can be dispersed in a well-balanced manner, and the resistance to twisting or bending can be improved. Mechanical strength, and the connection parts 31 and 32 serving as ground parts can be arranged in a well-balanced manner to improve high-frequency performance (or shielding effect).

According to the comparison test, in the case of comparing the inventive sample shown in Fig. 3(a), (b) with the existing product shown in Fig. 7(a), for mechanical strength, there is a characteristic of Fig. 3(c) The difference shown, for the high frequency performance, has the difference shown in Figure 4, no matter from which aspect, the inventive sample is better than the existing product.

That is, as shown in Figure 3 (a), (b), (c), in the direction A (cable stretching direction), the average strength of the inventive sample is 70.0N (Newton), in contrast, the existing product The average strength of the invention sample is 57.0N, and in the B and C directions (torsion direction of the cable), the average strength of the inventive sample is 90.0N and 35.0N, while the average strength of the existing product is 7.5N and 13.5N.

Also, regarding the high-frequency performance, as shown in the characteristic curves of the solid line H (invention sample) and the dotted line J (existing product) in Fig. 4, in the relationship between VSWR (voltage standing wave ratio) and frequency, the invention sample The frequency is up to 5.5GHz, and the VSWR is 1.3 or less. In contrast, the frequency of the existing product is 3GHz, and the VSWR is 1.3. When the frequency is 5.5GHz, the VSWR is 1.7 or more.

In addition, both the inventive sample and the existing product in the above-mentioned comparative test are formed by punching and bending a conductive metal plate with a plate thickness of about 0.3 mm, and the overall length in the axial direction is about 19 mm, and the outer diameter of the shell main body 20, 109 , The axial length is formed to be about 4mm, 12mm.

In the above-mentioned embodiments, the case where two connecting parts are formed and three crimping parts are described has been described, but the present invention is not limited thereto, and can be applied to the following cases: the central angle centered on the intersection point K Divide roughly into n equal parts and set n connecting parts (n is an integer greater than or equal to 2), and set m (m is an integer greater than or equal to n) or p (p is a positive integer smaller than n) crimping parts.

For example, it is applicable to the case where n=3 and m=3. An example of this is shown in Fig. 5(a) and (b).

In Fig. 5(a), (b), 50 is a terminal for a coaxial cable, and the terminal 50 for a coaxial cable is formed into an integral structure by punching, bending, etc. of a conductive metal plate, and has: A case main body 60 formed as an example of a substantially cylindrical fitting part main body is integrally connected to one end edge of the case main body 60 (left side in FIG. The crimping part 80.

The connecting portion 70 is composed of first, second, and third connecting portions 71, 72, and 73 formed in the shape of a laterally long rectangular plate, and these three connecting portions take the central axis direction of the case body 60 as the longitudinal direction and The length becomes longer in turn.

The 1st, 2nd, and 3rd connecting parts 71, 72, 73 are connected on the end edge of the case main body 60 side (left side in Fig. 5 (a)) and the central angle is divided into three equal parts (divided by 120 degrees). 3 equal divisions of the central angle centered on the intersection point K where the end face of the side edge of the case main body 60 intersects the central axis of the case main body 60 and extends obliquely inward.

The crimping portion 80 is composed of a first crimping portion 81, a second crimping portion 82, and a third crimping portion 83 connected to the front ends of the first, second, and third connecting portions 71, 72, and 73. The first crimping portion 81 , the second crimping portion 82 , and the third crimping portion 83 extend from the front end side of the case body 60 toward the central axis, and are formed so as not to overlap each other in the central axis direction.

The first crimping part 81, the second crimping part 82, and the third crimping part 83 are respectively formed in a substantially U-shaped cross-section perpendicular to the central axis of the case body 60, and on their wall surfaces, there is formed a bulge inwardly. The expansion part 86,87,88 of.

In the aforementioned embodiments, in order to improve the mechanical strength, the crimping part (such as 40 or 80), the main body of the fitting part (such as 20 or 60) and the n connecting parts (such as 31, 32 or 71-73) are made of conductive An integral structure formed integrally by processing a metal plate has been described, but the present invention is not limited thereto, and can also be applied to a case where a plurality of constituent parts individually formed by processing a conductive metal plate are engaged. linked together to form a combined structure.

For example, it can also be applied to the case where, as shown in FIGS. Combining the components 20A and 20B obtained by connecting, the first and second crimping parts 41 and 42 are integrally connected via the first connecting part 31 on one component part 20A, and the other component part 20B is connected via the first connection part 31. The third crimping portion 43 is integrally connected to the two connecting portions 32 . In this case, even a terminal for a coaxial cable having a complicated structure of the crimping portion and the connecting portion can be easily handled.

In the aforementioned embodiments, the n connecting parts (such as 31, 32 or 71-73) are connected at the following positions: on the end edge of one side of the main body of the fitting part (such as 20 or 60), the intersection point K will be the center The position obtained by dividing the central angle of n equally (for example, n is 2 or 3) has been described, but the present invention is not limited thereto. The present invention can also be applied to a position where the central angle n centered at the intersection point K is not equally divided. In this case, since the present invention has a plurality of connecting parts compared with the conventional example having only one connecting part, it is possible to improve the mechanical strength and high-frequency performance.

In the foregoing embodiments, although the case of a coaxial cable (that is, the case of a terminal for a coaxial cable) having a characteristic impedance of the cable of 75Ω (or 50Ω) has been described, the present invention is not limited thereto, and may be Applied to coaxial cables, shielded cables or electric wires whose characteristic impedance is other than 75Ω (or 50Ω).

For example, it can also be applied to the case of a shielded cable (that is, the case of a terminal for a shielded cable): although the inner conductor and the outer conductor constituting the cable are not coaxial, the outer conductor such as metal foil or metal packaging tape Covers the periphery of the inner conductor (for example, a 2-core wire made by twisting two insulated wires together) so that it is not disturbed by external noise.

In the case of the shielded cable terminal, similarly to the case of the coaxial cable terminal, the mechanical strength of the connecting portion with the shielded cable can be improved, and the electromagnetic shielding effect can be improved.

In addition, in the case of using an electric wire (for example, a general-purpose electric wire in which the periphery of a conductor is covered with an insulator) as a cable terminal, the mechanical strength of the connecting portion with the electric wire can be improved.

Claims (5)

1. terminal for cable, it is characterized in that, comprise and form columnar fitting portion main body, at least two different linking parts of length uniformly-spaced to form on an end of this fitting portion main body, be provided with respectively successively on the short linking part of length therein first, second pressure contact portion, the 3rd pressure contact portion of the front of the linking part that length is long setting therein, above-mentioned first pressure contact portion forms from the linking part outward above-mentioned length the grown shape with the cable crimping, above-mentioned the 3rd pressure contact portion forms with the internal face of above-mentioned second pressure contact portion opposed, and with the shape of the above-mentioned second pressure contact portion crimping cable.

2. terminal for cable as claimed in claim 1 is characterized in that, linking part in the end of fitting portion main body with to extending axially and being provided with two with 180 ° interval.

3. terminal for cable, it is characterized in that, comprise and form columnar fitting portion main body, on this fitting portion main body with to extend axially and with 120 ° interval and length increase successively respectively that ground is provided with first, second and third linking part, be separately positioned on this first, second, first of the front of the 3rd linking part, the second and the 3rd pressure contact portion, above-mentioned first pressure contact portion forms from outer the shape of above-mentioned second and third linking part with the cable crimping, with the shape of above-mentioned the 3rd linking part with the cable crimping, above-mentioned the 3rd pressure contact portion forms the shape of crimping cable from outer in above-mentioned second pressure contact portion formation.

4. as claim 1,2 or 3 described terminal for cable, it is characterized in that fitting portion main body, linking part and pressure contact portion are by the integrally formed Construction integration of conductive metal plate.

5. as claim 1,2 or 3 described terminal for cable, it is characterized in that fitting portion main body, linking part and pressure contact portion are the composite constructions that engaging links a plurality of constituent parts that formed by the conductive metal plate.

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