EP1378971A1

EP1378971A1 - Coaxial plug connector having a longitudinally divided shield housing, and coaxial angled plug connector

Info

Publication number: EP1378971A1
Application number: EP03014759A
Authority: EP
Inventors: Hannes Wendling; Olivier De Cloet
Original assignee: Tyco Electronics AMP GmbH
Current assignee: TE Connectivity Germany GmbH
Priority date: 2002-07-02
Filing date: 2003-06-27
Publication date: 2004-01-07
Anticipated expiration: 2023-06-27
Also published as: EP1378971B1

Abstract

The present invention relates to a coaxial plug connector having an electrically conductive shield housing and having an center conductor and an outer conductor. The outer conductor includes a first half shell and a second half shell which can be joined together in a direction substantially transverse with respect to the longitudinal axis of the cable. Furthermore, the invention relates to a coaxial angled plug connector in which the center conductor is angled such that the contact region and the connection region substantially form a right angle with one another. Finally, the invention relates to a process for making plug connectors of this type. In order to specify a coaxial plug connector and a coaxial angled plug connector and an associated manufacturing process as a result of which better electrical contact and insensitivity to electromagnetic interference are made possible at the same time as a simplified and less expensive means of manufacture, in the coaxial plug connector according to the invention the half shells of the outer conductor form the electrically conductive shield housing. The angled plug connector according to the invention has an center conductor made as a turned part.

Description

The present invention relates to a coaxial plug connector having an electrically conductive shield housing and having an center conductor, which is connectable to a cable center conductor and to a complementary center conductor of a mating plug connector, and an outer conductor which is connectable to an outer conductor of the mating plug connector and to a cable outer conductor. The outer conductor includes a first half shell and a second half shell, which can be joined together in a direction substantially transverse with respect to the longitudinal axis of the cable. Furthermore, the invention relates to a coaxial angled plug connector in which the center conductor is angled such that the contact region and the connection region are oriented at approximately a right angle to each other. Finally, the invention relates to a process for making a coaxial plug connector or coaxial angled plug connector.
Coaxial plug connectors are generally used in a broad range of applications to connect coaxial cables to one another or to a number of electronic components. Coaxial cables are the predominant type of cabling in the field of image transfer and for computer networks, since although they are more expensive than simple telephone cables, they are substantially less susceptible to disruptive interference and can transport more data. As the quantity of data to be transferred increases in the automotive sector, coaxial cabling use is increasing too, in particular for connecting the radio, GPS (Global Positioning System) or mobile radio devices to the onboard network of the motor vehicle.
Another area of application is telecommunications, where coaxial plug connectors are used for example for the greatest variety of connections in the base stations of mobile communications networks.
In general, a coaxial connector includes two substantially concentric conductors, a center signal conductor and an outer shield conductor which are insulated from one another by a dielectric and are conventionally used as a connection point for a transmission line. Angled coaxial plug connectors have been developed for connecting coaxial cables of lines running substantially transverse to one another. In the prior art, a number of techniques for connecting the center conductor and the outer conductor to the cable are proposed. As disclosed for example in WO 97/11511, an angled plug connector has the center conductor terminated by an insulation displacement contact and the outer conductor terminated by a crimp connection. With a straight coaxial plug connector, the cable center conductor is terminated by a crimp or solder connection and the cable outer conductor is terminated by a insulation displacement contact. According to WO 97/11511, and also EP 0 412 412 A1, in the case of an angled plug connector the center conductor of the plug connector and the cable center conductor meet in the plug connector such that they form a right angle and are connected to one another for example by way of a slot or a notch in the center conductor. As an alternative to this method of connection, however, angled center conductors may also be used in angled plug connectors.
An example of an angled center conductor of this kind is disclosed by DE 199 32 942 A1. The angled center conductor is in this case made as a punched bent metal part and connected to the center conductor of the cable by a crimp connection.
DE 199 32 942 A1 also discloses an angled plug connector in which an insulation displacement device upper part and an insulation displacement device lower part are provided in order to make contact with the cable outer conductor. When mated, the two-part insulation displacement device is received in a two-part socket housing made of synthetic material and is shielded by a push-on closure cap. This arrangement has the disadvantage that it requires a comparatively large number of parts and operating steps for its manufacture. Also, the problem of insufficient electrical shielding can occur, since the shield housing does not enclose the plug connector on all sides.
Making the center conductor as a stamped and formed metal part, as disclosed in DE 199 32 942 A1, has the disadvantage that manufacture is relatively complicated and that the requirements of mechanical stability and electrical contact resistance cannot always be adequately fulfilled.
In this case, pin-type center conductors, for example made in the form of a turned part, as disclosed in EP 0 884 800 A2 or EP 0 597 579 A2, provide a possible alternative.
An object of the present invention is to provide a coaxial plug connector and a coaxial angled plug connector and an associated manufacturing process which result in better electrical contact and insensitivity to electromagnetic interference while simplifying and reducing the cost of manufacturing.
In accordance with the invention, this and other objects are achieved by a coaxial plug connector having the features of Claim 1, a coaxial angled plug connector having the features of Claim 19, and a manufacturing process having the steps defined in Claim 20.
The invention is based on the realisation that a particularly simple assembly and as complete as possible a shield can be achieved if the outer conductor includes a first half shell and a second half shell which can be joined together in a direction substantially transverse with respect to the longitudinal axis, and these half shells of the outer conductor at the same time form the electrically conductive shield housing. The result is that the number of parts required and the process steps required can be reduced, and the entire plug connector is surrounded peripherally by the shield housing. Interference is therefore reduced and relatively large quantities of data may be transmitted through the connector.
According to an advantageous embodiment, the coaxial plug connector includes a sleeve which fits around the outer conductor in a connection region. The result of this is that electrical contact between the cable outer conductor and the outer conductor of the plug connector can be made simply by pushing the sleeve on.
In order to achieve particularly reliable electrical contact and improved mechanical strain relief, the sleeve may be crimped to connect the outer conductor to the cable outer conductor.
According to an advantageous embodiment, the connection region of the outer conductor is constructed such that it can be surrounded by the cable outer conductor. In particular when a crimped sleeve is used in this way, the cable outer conductor can be clamped between the outer conductor and the crimped sleeve and so an extremely firm mechanical connection can be made. Alternatively, the outer conductor may however also reach around the cable outer conductor in its connection region, as a result of which the need to slip back the cable outer conductor and then to lay it over the outer conductor is dispensed with, and the assembly time is reduced.
In order to ensure secure positioning of the two half shells of the outer conductor during assembly, the outer conductor may have a hinge-like attachment by means of which the two halves are connectable such that they may be rotated for the purpose of being joined together. In so doing, a geometrically favorable embodiment is the hinge-like attachment with an axis of rotation that runs transversely with respect to the longitudinal axis of the cable. It goes without saying, however, that an axis of rotation parallel to the longitudinal axis of the cable may also be provided.
A means of making a hinge-like attachment which is particularly simple to carry out from a production engineering point of view is an embodiment in which the hinge-like attachment is formed by at least one hook integrally formed on one of the half shells and engaging in an associated engagement opening in the other half shell.
Secure mounting of the center conductor can be achieved if a dielectric provided for the purpose of electrical insulation between the center conductor and the outer conductor is constructed such that the center conductor can be latched to the dielectric.
This can be done in a particularly simple and secure way if the center conductor has a latching projection and a ramp and the dielectric has an associated change in diameter and a further ramp. The length between these two latching devices must be matched precisely and have a narrow tolerance. The latching can then be achieved for example by different angles for the ramps, such as 30° on the center conductor and 34° on the dielectric. Latching can also be performed by the center conductor having a peripheral latching projection which for the purpose of latching engages in an associated groove on the dielectric.
The advantageous properties of a coaxial plug connector of this kind become particularly effective if the coaxial plug connector is constructed as an angled plug connector in which the longitudinal axis of the cable runs substantially transversely with respect to the direction of plugging into a mating plug connector.
A particularly secure electrical contact can be made between the cable center conductor and the center conductor of the coaxial plug connector if a center conductor is provided whereof the contact region and the connection region substantially form an angle of 90° with one another. In this way, conventional techniques for forming a connection between the center conductor and the cable center conductor, such as crimping, can be used. The abutment against one another of the center conductor and the cable center conductor in a region in which their axes are not parallel to one another is avoided in this embodiment.
A center conductor which is particularly mechanically stable is obtained by making the center conductor as a turned part As an alternative, however, it is also possible to make it by punching and bending metal.
As an alternative, the center conductor may also be made with the aid of an extrusion process. This allows a substantially simpler manufacturing process to be achieved. Since it is a non-cutting manufacturing process, there is no waste and the raw material can be 100% utilised. Extrusion represents a faster process than turning, since depending on the circumference and intensity up to 1000 parts per minute can be manufactured, so production can be sped up substantially. Because the center conductor is made by a shaping technique, the material is compressed and the center conductor has better tensile strength than turned parts of similar shape. Finally, manufacture by the extrusion process has the advantage that the manufacturing tools are subject to substantially less wear during production than with turning.
A particularly secure and readily automated means of making a connection between the center conductor and the cable center conductor is provided by crimping. As an alternative, however, it is also possible to provide a solder connection or a simple push-in connection.
The shield housing is provided with particularly good electrical shielding properties if the half shells can be made from metal, for example in a die casting technique or a cutting-machining process.
Lower weight and lower manufacturing costs are the advantage of an alternative embodiment in which the half shells can be made from a synthetic material. For the purpose of electrical shielding, the synthetic material contains conductive fibres or is coated to make it conductive. Manufacture of synthetic half shells of this kind is preferably carried out by means of an injection moulding process.
Secure mechanical fixing of the two half shells to one another can be achieved by latching the two half shells to one another.
The invention will be explained in more detail below with reference to the embodiments illustrated in the attached drawings. Similar or corresponding details of the subject matter of the invention are provided with the same reference numerals. In the drawings:
Figure 1 is an exploded perspective view of a coaxial angled plug connector according to the invention;
Figure 2 is a perspective view of the angled plug connector from Figure 1 before the outer conductor half shells have been joined together;
Figure 3 is a perspective view of the angled plug connector from Figure 1 before the crimped sleeve has been mounted;
Figure 4 is a perspective view of the angled plug connector from Figure 1 in the fully assembled condition;
Figure 5 is a perspective view of a center conductor according to a first embodiment, in the non-angled condition;
Figure 6 is a perspective view of the center conductor according to the embodiment from Figure 5 in the angled condition;
Figure 7 is a perspective view of an angled center conductor according to a second embodiment;
Figure 8 is a perspective view of a section through the contact region of the coaxial plug connector of Figure 1 in the assembled condition;
Figure 9 is a perspective view of a coaxial cable portion having its insulation removed, to which the angled plug connector is to be mounted;
Figure 10 is a perspective view of the cable portion from Figure 9 once the clamping sleeve has been mounted;
Figure 11 is a perspective view of the cable portion once a non-angled center conductor has been attached by crimping;
Figure 12 is a perspective view of the arrangement from Figure 11 once the cable outer conductor braid has been bent back;
Figure 13 is a perspective view of the alternative mounting of a bent center conductor on the arrangement from Figure 10;
Figure 14 is a perspective view of the cable end with the cable outer conductor braid bent back and the center conductor bent off;
Figure 15 is a perspective view of the arrangement from Figure 14 and the first outer conductor half shell before assembly;
Figure 16 is a perspective view of the arrangement from Figure 15 in the joined-together condition;
Figure 17 is a perspective view of the arrangement from Figure 16 with the second outer conductor half shell attached in the manner of a hinge;
Figure 18 is a perspective view of the arrangement from Figure 17 with the second outer conductor half shell folded closed and latched;
Figure 19 is a perspective view of the arrangement from Figure 18 with the cable outer conductor braid slipped over the connection region of the outer conductor;
Figure 20 is a perspective view of the arrangement from Figure 19 with the clamping sleeve pushed over the braid;
Figure 21 is a perspective view of the arrangement from Figure 20 after the last process step of crimping the clamping sleeve; and
Figure 22 is a perspective view of a perspective illustration of a coaxial angled plug connector according to a further advantageous embodiment.
Figure 1 shows an exploded illustration of a coaxial plug connector 100 according to the invention in an angled orientation, together with a connection end of a coaxial cable 118 having its insulation removed. The coaxial plug connector 100 has an outer conductor 102 which is connectable to an outer conductor of a mating plug connector, not shown in this or the following figures, and to a cable outer conductor 120.
The outer conductor 102 is divided, parallel to the longitudinal axis of the cable 118, into two half shells 112 and 114 which form a substantially closed conductive shield housing. The connection between a cable center conductor 122 and a complementary center conductor (not shown) of a mating plug connector is made by the center conductor 104 of the coaxial plug connector. The center conductor 104 is insulated electrically from the outer conductor 102 by the dielectric 106. An external spring 108 is attached by a ring 110 in the contact region 128 for resiliently securing the plug connector 100 to the mating plug connector, and for electrically connecting the outer conductor 102. The external spring 108 may optionally be attached without the ring 110. Outward protrusions 130 on the outer conductor ensure mechanical stability once the dielectric 106, the external spring 108 and the optional ring 110 have been mounted.
In the connection region 132 the outer conductor 102 is brought into electrical contact with a braid 120 of the cable 108. The braid 120 is pushed over the connection region 132 and electrically terminated thereto by a sleeve 116. The sleeve may be crimped to give adequate strain relief A peripheral latching projection 134 and a ramp 136, which are provided on the center conductor 104, make it possible for the center conductor 104 to latch inside the dielectric 106. Along its internal diameter, the dielectric 106 has a corresponding widening in cross-section or a groove for receiving the latching projection 134 and an associated further ramp 137 (see Figure 8).
Two hooks 138, which are integrally formed on the second half shell 114, form with corresponding openings in the first half shell 112 a hinge-like attachment. For assembly, the second half shell 114 can be fixed to the first half shell 112 using these hooks 138 by rotating about an axis of rotation running substantially perpendicular to the longitudinal axis of the cable 118. In this way, positioning of the second half shell 114 during assembly is facilitated, and the mechanical stability of the overall construction is increased.
Figure 2 shows a perspective illustration of a partially assembled coaxial plug connector 100, in which the external spring 108, the ring 110 and the dielectric 106 have already been applied to the first half shell 112 of the outer conductor 102 and the center conductor 104 is latched to the dielectric 106 and connected to the cable center conductor 122 by a crimping The cable outer conductor 120 is still folded back and the second half shell 114 is not yet mounted.
Figure 3 shows a further assembled coaxial plug connector 100, in which both half shells 112 and 114 are joined together and the outer conductor braid 120 has been pushed over the contact region 132 of the outer conductor 102. It is clearly visible that the entire plug connector arrangement is enclosed on all sides by the shield housing formed by the outer conductor 102.
Once the electrical connection has been made between the outer conductor 102 and the braid 120, as illustrated in Figure 4, optimum shielding from electromagnetic interference is produced. As shown in Figure 4, the sleeve 116 is pushed over the contact region 132 and is secured with a crimping tool to provide electrical connection to the half shells 112, 114 and good strain relief.
Various embodiments of the center conductor 104 are shown in Figures 5 to 7. The center conductor 104 can be made as a turned part, as shown in Figures 5 and 6. The electrical connection to the center conductor 122 of a coaxial cable is made through the connection opening 140 and can crimped or soldered to give better a mechanical and electrical connection. In the case of an angled plug connector, a turned part of this kind can be bent at a right angle, as shown in Figure 6. The embodiments shown in Figures 5 and 6 of the center conductor 104 may also alternatively be made by an extrusion technique. In this case, the latching projection 134 and the ramp 136 are formed by transverse rolling using appropriately shaped transverse rollers. A further embodiment of a center conductor 104 is shown in Figure 7. The center conductor 104 shown here is made by stamping and forming a metal sheet and has a crimp connection in the area of the connection opening 140 for connecting it to the center conductor 122 of the coaxial cable.
Figure 8 shows a longitudinal section through the contact region 128 in the fully assembled condition. In this illustration, the way the center conductor 104 is latched to the dielectric 106 is visible. In this embodiment, the latching projection 134 engages in a place where there is a widening of the cross-section of the dielectric 106 and is fixed by the interaction between the two ramps 136 and 137, which for this purpose have different ramping angles.
The individual steps of mounting for making a coaxial angled plug connector according to the present invention will be presented in detail with reference to Figures 9 to 21.
Referring to Figure 9, first of all a coaxial cable 118 has its insulation removed in a first operating step such that the cable center conductor 122 and the cable outer conductor 120 (usually a wire braid) are exposed. Then, a clamping sleeve 116, as shown in Figure 10, is pushed over the cable end.
As shown in Figure 11, it is now possible either to mount a straight center conductor 104 on the cable center conductor 122 and to connect it to the latter by crimping. Then the next operating step is performed, as shown in Figure 12, by stripping back the braid 120. Angling off the center conductor 104 gives the arrangement shown in Figure 14.
As an alternative, however, it is also possible, as shown in Figure 13, to mount an angled center conductor 104 on the arrangement shown in Figure 10. In this case, stripping back the braid 120 arrives at the arrangement shown in Figure 14.
Figure 15 shows the arrangement of Figure 14 with a pre-assembled first half shell 112 into which the dielectric 106 has already been inserted Latching the center conductor 104 into the dielectric 106 gives the arrangement shown in Figure 16.
In the next step, as shown in Figure 17, the second half shell 114 is connected to the first half shell 112 by a hinge. Rotating the half shell 114 in the direction 142, about an axis of rotation running transversely with respect to the longitudinal axis of the cable, the two half shells 112, 114 are connected (latched) to one another. As illustrated in Figure 18, this gives a shield housing which is closed on all sides and is formed by the outer conductor 102. The outer conductor 102 may in this case be made from metal, for example from zinc or aluminium in a die casting technique, or comprise a synthetic material with conductive particles or a conductive coating. This last variant is performed for example by an injection moulding process with a synthetic material which has a filling of metal fibres.
In order to make an electrically conductive and mechanically firm connection between the connection region 132 of the outer conductor 102 and the braid 120, the braid 120 is first pushed over the connection region 132, which gives the arrangement in Figure 19.
Then, the clamping sleeve 116 is pushed over the braid 120 (see Figure 20).
In a final operating step, the clamping sleeve is fixed using a crimping tool, which gives the fully assembled arrangement shown in Figure 21.
As an alternative to the steps shown in Figures 9 to 21, the braid 120 from which the insulation has been removed may be left over the cable even after the insulation has been removed, and be brought into electrical contact on the inner surface of the connection region 132.
Figure 22 shows a further embodiment of a coaxial plug connector 100 in which the second half shell 114 is not connectable to the first half shell 112 by way of a hinge-like attachment, but may be mounted to the first half shell 112 by being displaced in a direction 144 parallel to the longitudinal axis of the cable 118. Inter-engaging guide elements such as grooves and guide projections may be integrally formed on the wall elements of the half shells 112, 114 that come up against one another. This embodiment may be advantageous if the geometrical relationships during assembly do not permit rotation, and moreover it enables a more reliable connection between the two half shells.
Although only center conductors having a round cross-section in the contact region have been shown in the embodiments shown, the present invention may also be applied with center conductors of square or rectangular cross-section. This is possible in particular when extrusion or punching processes are used.

Claims

A coaxial plug connector having an electrically conductive shield housing, a center conductor (104), which is connectable to a cable center conductor (122) and to a complementary center conductor of a mating plug connector, and an outer conductor (102) which is connectable to an outer conductor of the mating plug connector and to a cable outer conductor (120), in which the outer conductor (102) includes a first half shell (112) and a second half shell (114) which can be joined together in a direction substantially transverse with respect to the longitudinal axis of the cable (118), characterised in that the half shells (112, 114) of the outer conductor (102) form the shield housing.
A coaxial plug connector according to Claim 1, characterised in that it furthermore includes a sleeve (116) which reaches approximately form-fittingly around the outer conductor (102) in a connection region (132).
A coaxial plug connector according to Claim 2, characterised in that the sleeve (116) is a crimped sleeve and connects the outer conductor (102) to the cable outer conductor (120) by means of a crimp connection.
A coaxial plug connector according to one of Claims 1 to 3, characterised in that the connection region (132) of the outer conductor (102) is constructed such that it can be surrounded by the cable outer conductor (120) when assembled.
A coaxial plug connector according to one of Claims 1 to 3, characterised in that the outer conductor (102) reaches around the cable outer conductor (120) in its connection region (132) when assembled.
A coaxial plug connector according to one of Claims 1 to 5, characterised in that the outer conductor (102) has a hinge-like attachment (138, 140) by means of which the two half shells (112, 114) are connectable such that they may be rotated for the purpose of being joined together.
A coaxial plug connector according to Claim 6, characterised in that the hinge-like attachment (138, 140) has an axis of rotation that runs transversely with respect to the longitudinal axis of the cable (118).
A coaxial plug connector according to Claim 6 or 7, characterised in that the hinge-like attachment is formed by at least one hook (138) integrally formed on one half shell (114) and engaging in an associated engagement opening (140) on the other half shell (112).
A coaxial plug connector according to one of Claims 1 to 8, characterised in that it furthermore has a dielectric (106) for the purpose of electrical insulation between the center conductor (104) and the outer conductor (102) and the center conductor (104) can be latched to the dielectric (106).
A coaxial plug connector according to Claim 9, characterised in that the center conductor (104) has a peripheral latching projection (134) which engages in an associated recess in the dielectric (106).
A coaxial plug connector according to Claim 10, characterised in that the center conductor (104) has a peripheral ramp (136) which engages in an associated second ramp (137) on the dielectric (106).
A coaxial plug connector according to one of Claims 1 to 11, characterised in that the coaxial plug connector is constructed as an angled plug connector in which the longitudinal axis of the cable (118) runs substantially transversely with respect to the direction of plugging into the mating plug connector.
A coaxial plug connector according to Claim 12, characterised in that the center conductor (104) has a contact region for making a connection with the center conductor of the mating plug connector and a connection region for connection to the cable center conductor (122) and the center conductor (104) is angled such that the contact region and the connection region substantially form an angle of 90° with one another.
A coaxial plug connector according to one of Claims 1 to 13, characterised in that the center conductor (104) may be made as a turned part, by punching and bending or as an extruded part
A coaxial plug connector according to one of Claims 1 to 14, characterised in that the center conductor (104) is connectable to the cable center conductor (122) by means of a crimp connection, a solder connection or a push-in connection.
A coaxial plug connector according to one of Claims 1 to 15, characterised in that the half shells (112, 114) can be made from metal in a die casting technique or from metal by a cutting-machining process.
A coaxial plug connector according to one of Claims 1 to 16, characterised in that the half shells (112, 114) can be made from a synthetic material with a filler of conductive fibres or a synthetic material with a conductive coating.
A coaxial plug connector according to one of Claims 1 to 17, characterised in that the first half shell (112) and/or the second half shell (114) are constructed in a plurality of parts.
A coaxial angled plug connector having an electrically conductive shield housing, a center conductor (104), which is connectable in a connection region to a cable center conductor (122) and in a contact region to a complementary center conductor of a mating plug connector, and an outer conductor (102) which is connectable to an outer conductor of the mating plug connector and to a cable outer conductor (120), in which the center conductor (104) is angled such that the contact region and the connection region substantially form an angle of 90° with one another, the center conductor (104) may be made as a turned part.
A process for making a coaxial plug connector, having the following steps:

(a) mounting a center conductor in a first half shell of an outer conductor, in which the center conductor is insulated from the first half shell by a dielectric,

(b) connecting the center conductor to a cable center conductor,

(c) mounting a second half shell of the outer conductor formed by the shield housing, in which the first half shell and the second half shell of the outer conductors form an electrically conductive shield housing, and

(d) connecting a connection region of the outer conductor to a cable outer conductor.