CZ275895A3 - Connecting cable for connecting apparatus to data network - Google Patents

Abstract

As connecting device for a data network, a connecting box (15) contains a circuit board by means of which two BNC sockets (16, 17) and at least one switched socket (18) are connected to one another. In order as far as possible not to interrupt the coaxial system of the data network in the region of the connecting box (15), the circuit board is constructed as a multilayer board, with the conductor tracks (43) extending between two shielding conductor surfaces (41, 42). The switched socket (18) is surrounded for the same purpose by a tightly fitting screening plate (44). In the case of the associated connecting cable, the plug-in part (24) of the plug (23) is likewise surrounded by a screening plate (46), with the result that the coax-like conductor guidance is continued here, as well. The connecting device therefore reliably meets the transmission requirements, such as immunity to radiated interference and low signal distortion. <IMAGE>

Description

BACKGROUND OF THE INVENTION The invention relates to a connection cable for a data network connection device comprising a BNC plug at one end of the connection cable and a functional plug at the opposite end of the connection cable provided with at least two pairs of contact tongues arranged in pairs on opposite sides. wherein a signal conductor is always connected to the two contact tongues of the first pair of contact tongues, and the signal conductors are insulated and shielded from each other to a BNC plug where they are connected together to its central pin, wherein the contact tongues of the second pair of contact tongues are electrically connected shielding of signal wires.

BACKGROUND OF THE INVENTION

Such a connection cable is known, for example, from the German utility model DE-Gm 90 00 754. The data network is primarily used to interconnect several data processing devices or to connect them to a central computer or the like. For this purpose, a shielded coaxial cable is usually permanently installed, along which a number of connection sockets are connected along the length, so that the devices can be connected at different points in the space or throughout the building as appropriate using suitable connection cables. The advantage of the functional sockets actually developed for telephone connection sockets lies in the fact that the data network is never interrupted, regardless of whether the connection cable is plugged in or not. Therefore, no inattention error can occur. The disadvantage lies in the fact that the solution is at the limit of the technical requirements imposed on these networks, for example in terms of the radiation level, these requirements can only be met at the limit of the permissible frame. The reason is that the coaxial system is interrupted in the area of the connection sockets and function plugs. From the above-mentioned utility model, it is known that the conductive connections on the printed circuit board in the connection socket can be shielded in particular by means of a large opposed copper foil.

Also known are functional plugs of the connecting cable which are enclosed in a die-cast zinc die casting. By encapsulating such interference, interfering radiation and the intrusion of interfering signals into the network are avoided, but the coaxial system still remains interrupted, resulting in transmission loss and signal distortion at the very limit of admissibility. In addition, the described encapsulation is very expensive, and on the other hand, in many applications it is desirable that no grounded metal parts be freely accessible in order to avoid spark discharges of electrostatic charges.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a connection cable construction which enables the transmission of signals to be met more reliably and safely even in series production.

SUMMARY OF THE INVENTION

The drawbacks of the known connection cables are largely eliminated by the connection cable for a data network connection device according to the invention, which is characterized in that the male plug portion of the functional plug is encircled by a plastic sleeve between which an annular gap is provided. encircling a third shielding plate, between which there is a gap between the plug portion and the at least a first pair of contact tongues being arranged to overlap and electrically conductively connected to the second shielding of the signal wires.

It is preferred that the third shielding sheet abuts on two opposed inner flat sides and one right-angled inner narrow side of the plastic sleeve, wherein the inner narrow side of the plastic sleeve lined with the third shielding sheet is adjacent the first a pair of contact tongues.

It is furthermore advantageous if the functional fork is provided with two adjacent pairs of contact tongues which are connected in parallel to the individual signal conductors and are arranged at an inner narrow side lined with a third shielding plate, the other pair of contact tongues being connected to the second shielding. It is arranged at the inner narrow side of the plastic sleeve, where the third shielding sheet is selected.

In addition, it is advantageous if the third shielding sheet is bent to approximately U-shape, its arc extends at least partially over the loosely arranged second shields of the signal wires and is in contact with them and the two U-shaped legs of the third shielding sheet substantially parallel and spaced from The contact tongues extend as far as the front edge of the functional fork and overlap the two inner flat sides, the first bends projecting from the two arms of the third shielding plate towards the common central plane, the surfaces complementing each other covering the inner narrow side of the plastic sleeve.

The plastic sleeve preferably consists of two moldings; connectable to each other in the central plane, which insulatingly also enclose the entire third shielding sheet including the cable terminal, | The plastic sleeve has a rectangular outer contour when viewed from the insertion side.

The plug-in part of the functional plug is therefore also encircled by the shielding plate. It is understood that the shield plates of the functional socket and the functional plug are interlocked in the manner of the socket and the plug. In this way, the coaxial system of the data network is, as far as possible, continually maintained at the connection points of other devices. On the outside, the entire system is insulated and the connection socket can still be made with a plastic housing in the usual way.

BRIEF DESCRIPTION OF THE DRAWINGS

The principles of the invention and other advantages and advantages achieved by this solution will be further elucidated on non-limiting examples of its embodiment, which are described on the basis of the attached drawings, which show:

FIG. 1 shows the electrical connection of a schematically indicated shielding using a connection cable according to the invention,

- Fig. 2 is a cross-section of the printed circuit board of the connection socket,

FIG. 3 shows a side view of a flush-mounted connection socket, with only a few schematically indicated components,

Fig. 4 is a perspective view of the functional drawer with the shielding plate in the unfolded state prior to installation,

FIG. 5 is a side view of the functional fork of the invention with the top half of the housing removed, and

FIG. 6 is a cross-sectional view of the receptacle and plug just prior to insertion, with a portion to the right of the median plane showing a section in the plane 6r-6r of FIG.

DETAILED DESCRIPTION OF THE INVENTION

In the wiring diagram shown in FIG. 1, the incoming data bus 11 is connected to the first BNC plug 12. The outgoing data bus 13 is connected to the second BNC plug 14. Between these BNC plugs 12, 14 is only schematically shown here. The connection socket 15, which mainly comprises two BNC sockets 16. 17 for connecting the BNC plugs 12, 14. The connection socket 15 further comprises two functional sockets 18, 19. These functional sockets 18, 19, which are identical, have a first pair of contact tongues formed in a pair of opposed contact tongues 21, 22 which electrically contact each other electrically when no functional plug is inserted, as shown in the second functional socket 19. However, if the functional plug 23 is inserted. as shown in the first functional receptacle 18 on the left side, the contact tabs 21 are spaced apart. 2.

The functional fork 23 is provided with a first pair of contact tongues formed by two contact tongues 25, 26 arranged opposite each other on opposite outer sides of the first plug portion 24. Signal conductors 27, 28 are connected to these contact tabs 25, 26 and are insulated from each other and electrically shielded. Opposite ends of these signal wires 27, 28 are connected to the central pin 29 of the third BNC plug 31. The two signal wires 27, 28 together with the functional plug 23 and the third BNC plug 31 form a prefabricated duplex

A connecting cable 32 which serves to connect the data processing device 33 to the data network.

The signal path here proceeds from the incoming data bus 11 via the central pin 34 of the first BN (12) to the central contact cavity 35 of the first BNC socket 16 and from there to the first contact tongue 21 of the first functional socket 18 and through the third contact tongue 25 23 and the first signal conductor 27 to the central pin 29 of the third BNC plug 31. Here the signal path splits both to the data processing device 33 and secondly to the second signal conductor 28 back to the fourth contact tongue 26, from where it passes through the second contact tongue 22. the functional socket 18 and through the contact tongues 21, 22 of the second functional socket 19 to the central contact cavity 36 of the second BNC socket 17, from where the final signal path through the central pin 37 of the second BNC plug 14 passes into the outgoing data bus 13.

It is not shown in FIG. 1 that each of the functional sockets 18, 19 is provided with a further pair of contact tongues located in a plane below the illustrated contact tongues 21, 22, which need not have any switching functions and are electrically connected to the first shields 38 of the BNC sockets. Similarly, the functional fork 23 is provided with a second pair of contact tabs which are connected in parallel to the second shields 39 of the signal wires 27, 28 and electrically connected to the first shields 38 via the second pair of contact tabs.

Further, FIG. 1 does not show that each of the functional drawers

18, 19 is preferably provided with a further pair of contact tongues arranged in a plane above the illustrated contact tongues 21, 22, which are electrically connected in parallel with the illustrated contact tongues 21, 22. Function fork;

it is also provided with another corresponding pair of contact tabs. Therefore, if there is a faulty contact at some point, the parallel contact will reliably assume its function - also not shown. FIG. 1 schematically depicts a first conductive surface 41 and a second conductive surface 42 on both sides of the printed circuit boards 43, as well as shielding plates 44, 45 in the region of the functional sockets 18, 19, all of these shielding elements being connected to the first The functional fork 23 is also provided with a third shielding plate 46 which is electrically connected to the second shielding 39.

FIG. 2 is a schematic cross-sectional view of a printed circuit board 47 which is in the form of a multilayer. On the first flat side 48 of the base plate 49, conductive joints 43 are applied, while on the second flat side 51 there is a first conductive surface 41. Above the first flat side 48 there is an insulating layer 52, on whose outer flat side 53 a second conductive surface 42 is arranged. In the two conductive surfaces 41, 42, which extend across the entire surface of the printed circuit board 47, islands are formed in which the first through connections 54 are arranged to the internally arranged conductive connections. Conversely, the outer conductive joints bypass the second through joints 55 that connect the two outer layers.

FIG. 3 shows the overall construction of the connection socket 15. The printed circuit board 47 is provided with at least one functional socket 18 on its upper side and the BNC sockets 16, 17 which are designed as angular sockets protrude from the bottom side of the printed circuit board 47. . The printed circuit board 47 is housed in a two-piece first plastic housing 60, which consists of a bottom 56 in the form of a plate and a lid 57. In the bottom 56 there are recesses 58 for the passage of the connection sleeves 59 of the BNC sockets 16, 17. a metal fastening ring 61 is fixedly connected to the plastic housing 60 for attachment in the wall box 62. At the top is a cover plate 63 on which a panel 64 of even greater contour is attached. The first functional drawer 18 is encased on three sides by the first shielding plate 44, as can be seen more clearly from the illustration in FIG. 4.

According to FIG. 4, the first functional drawer 18 is provided with a second prism-shaped plastic casing 66 with a pair of larger flat sides 67, 68 parallel to each other and a pair of narrow sides 69, 71 perpendicular to said flat sides 67, 68.

In the upper side of the second plastic housing 66, an opening for receiving the respective functional fork 23 is provided, and FIG. 4 also shows the inwardly engaging contact tongues 21, 22 whose solder tips project from the underside of the second plastic housing 66. The first shielding sheet 44 is curved approximately U-shaped and consists of two large-area side arms 72, 73, which immediately abut the flat sides 67, 68, and a transverse arm 74, which abuts the narrow side 69. Said arms 72, 22. 74 are still provided at the top with an inwardly curved skirt 22 which extends somewhat over the upper side of the second plastic sleeve 66. Said skirt slouží5_ serves for reinforcement. The first shield sheet 44 is provided with a plurality of solder tabs 76 that are integrally formed with the first shield sheet 44 and protrude downward. In the arms 22, 73, 74, the E-shaped lamellas 77 are embossed by embossing and are each slightly bent away from the second plastic case 66. These lamellas 77 serve to resiliently contact the shielding sheath of the functional plug 23, which will be described in more detail later.

The first shielding sheet 44 can be easily bent due to the U-shaped design shown in FIG.

V - In the region of the open side of the U-profile, there is a narrow side 71 of the second plastic sleeve 66, in which it is already arranged; the described second pair of contact tongues, which are connected to the shielding and thus, instead of the missing side of the first shielding plate 44, complement the shielding of the first fusing socket 18. The pairs of contact tongues through which the signal passes are arranged within the shielded area of the first shielding plate; 44. which rests as a thin layer on the second plastic sleeve 66 and therefore occupies minimal space.

Fig. 5 shows the form of the functional fork 23 shown by the weak and partially dashed lines. The downwardly extending second plug portion 78 is spaced from one another by a plastic sleeve 79 which, when viewed from the insertion direction, is a rectangular ring. A third shielding plate 46 is disposed on the inner side of the sleeve 79, between which a. The second plug portion 78 with the contact tabs 25, 26 is an annular gap of rectangular shape. The outline of the third shielding sheet 46 is drawn in bolder lines for clarification. This third shielding sheet 46 is curved approximately U-shaped as shown in the cross-sectional view of FIG. 6, with the U-shaped arc 82 partially overlapping the free shields 34 of the signal conductors 27, 28 of FIG. soldered. The two arms 83, 84 of the third shield plate 46 extend flat and substantially parallel to the contact tongues 25, 26 almost to the edge 85 of the functional fork 23 while covering the two inner flat sides 86, 87 of the plastic sleeve 79. It can be seen from Fig. 5 that these arms 83, 84 extend from the right inner narrow side 88 to almost the opposite left inner narrow side 89, namely just far enough to laterally overlap the second pair of contact tongues that is to the left inner narrow In this case, the second pair of contact tongues assumes the function of shielding instead of the third shielding plate 46, in which there is a recess at this point. This solution greatly simplifies the bending operations in the manufacture of the third shielding sheet 46, from whose legs 83, 84 extend the first bends 91 toward the common central plane 92, the surfaces of which complement the right inner narrow side lining 88. Also above the second plug portion 78 in the region The fastening of the contact tongues 25, 26 protrudes from the arms 83, 84 of the second bend 93, which thereby complements the shielding sheath there.

The plastic sleeve 79 consists of a pair of moldings 94, 95 which can be connected to each other in the central plane 92 and which also insulate the entire third shielding sheet 46 including the cable end 96. The moldings 94, 95 of the sleeve 79 are provided with a series of These are, in particular, a pair of strips 97, 98 which extend into cutouts 99 in the arms 83, 84.

It can further be seen from FIG. 6 that the third shielding plate 44 of the first functional drawer 18 is in the manner of a socket and a plug in contact with the third shielding plate 46 of the functional fork 23. the existing clearance is compensated by the slats 77.

Claims (5)

A connection cable for a data network connection device comprising a BNC plug at one end of the connection cable and a functional plug at the opposite end of the connection cable, provided with at least two contact pairs arranged in pairs on opposite sides of the plug part. The signal conductors are each connected to the two contact tongues of the first pair of contact tongues and the signal wires are insulated from each other and shielded to the BNC plug, where they are connected together to its central pin, wherein the contact tongues of the second pair of contact tongues are electrically shielded signal wires, characterized in that the second plug portion (78) of the functional plug (23) is surrounded by a plastic sleeve (79) between which and the periphery of the second plug portion (78) is an annular gap and which further encircles a third shielding plate (46) between which and the second plug portion (78) is a gap, wherein at least the first pair of contact tabs (25, 26) is arranged to overlap and is electrically conductively connected to the second signaling shielding (39) conductors (27, 28). Connection cable according to claim 1, characterized in that the third shielding sheet (46) abuts on two opposite inner flat sides (86, 87) and on one right-angled inner narrow side (88) of the sleeve (79) ), wherein the inner narrow side (88) of the plastic sleeve (79), which is lined with the third shielding sheet (46), is adjacent to the first pair of contact tongues (25, 26). Connection cable according to claim 1, characterized in that the functional plug (23) is provided with two pairs of contact tongues arranged next to each other, which are connected in parallel to the individual signal conductors. (27, 28) and are arranged at an inner narrow side (88) lined with a third shielding sheet (46), wherein a further pair of contact tongues, which is connected to the second shield (39), is arranged on the inner narrow side (89) of the sleeve (79). ) of plastic, wherein the third shielding plate (46) is selected. Connection cable according to one of Claims 1 to 3, characterized in that the third shielding sheet (46) is approximately U-shaped, its arc (82) extends at least partially over the loosely arranged second shields (39) of the signal conductors (27). 28) and is in contact with them, and the two U-profile arms (83, 84) of the third shielding plate (46) extend substantially parallel and spaced from the contact tabs (21, 22) to the front edge (85) of the functional fork (23). ) overlapping the two inner flat sides (86, 87), the first bends (91) projecting from each of the arms (83, 84) of the third shielding sheet (46) towards the common central plane (92), whose surfaces complement each other the inner narrow side (88) of the plastic sleeve (79). Connection cable according to one of Claims 1 to 4, characterized in that the plastic sleeve (79) consists of two moldings (94, 95) connectable to each other in the central plane (92), which also insulate the entire third shielding sheet (46) ) including the cable terminal (96), the plastic sleeve (79) having a rectangular outer contour as viewed from the insertion side.