Electrical socket

The invention relates to an electrical plug-in socket having the features of the preamble of claim 1.

Such plug-in sockets are also known under the designation "Western jack" and are widely used in message and data technology. By the interaction of the plug-in connector with a corresponding connecting plug, a detachable electrical connection can be established for the transmission of electrical signals. In this case, increasingly higher transmission rates are used, with the result that a disturbing electrical signal coupling is established within the plug socket between conductor pairs, so that the transmission quality is impaired. The signal coupling is both capacitive and inductive in nature.

In order to keep such couplings low, it is proposed in US Pat. No. 5,186,647 and US Pat. No. 5,362,257 to cross over certain conductors within the contact module. To this end, elaborately designed conductor guides are used so that the production of the plug-in connectors is associated with a considerable expense.

In DE 199 38 367 A1, a plug-in socket is described in which eight conductors are arranged next to one another, wherein a cross-over region is provided by means of a double-sided laminated circuit board which can be secured to the contact module, in order to cross the conductors with the numbers 3 and 6. For this purpose, these conductors must be interrupted prior to the application of the double-sided printed circuit board, and the printed circuit board must be inserted into a receptacle of the contact module. Such a configuration of the plug-in socket is thus also associated with considerable production costs.

US Pat. No. 6,089,923 and EP-A-0 982 815 disclose electrical plug sockets in which a housing surrounds a contact module which comprises a plurality of electrical conductors and contact elements, the contact elements being contactable by the associated plug-in contacts of a connecting plug. Two conductors each form a pair of conductors for transmitting a high-frequency electrical signal. The contact module has a multilayer electrical circuit board, into which the contact elements are inserted. The contact elements each form a contact spring with their end regions which project beyond the printed circuit board and face a plug shaft. The circuit board carries compensating capacitors for the capacitive coupling of conductors of different conductor pairs. The circuit board also carries conductor tracks which form the electrical conductors of at least two conductor pairs. In a first conductor track section, a first conductor track of the first conductor pair has a smaller spacing from a first conductor track of the second conductor pair than the second conductor conductor of the second conductor pair, and in a second conductor track section, the first conductor track of the first conductor pair has a smaller conductor line to the second conductor conductor of the second conductor pair Distance than to the first conductor track of the second conductor pair.

SUMMARY OF THE INVENTION The object of the present invention is to further develop an electrical plug-in socket of the type mentioned at the outset in such a way that it can be produced at low cost and the danger of signal coupling between different conductor pairs is reduced.

This object is achieved by an electrical plug-in socket having the features of claim 1.

The use of a multilayer electrical circuit board in combination with contact elements, which are inserted into the printed circuit board and form contact springs with their free end regions, allows a compact design of the contact module. By inserting the contact elements into the printed circuit board, the end regions of the contact elements, which protrude over the printed circuit board, can be kept very short in the form of the contact springs, so that on the one hand a spring-elastic contacting of the assigned plug contacts of the connecting plug is ensured but on the other inductive and capacitive couplings between conductors of different Conductor pairs can be kept low.

The insertion of the contact elements into the printed circuit board also enables a cost-effective production of the electrical plug-in socket since an expensive soldering connection between the contact elements and the printed circuit board can be dispensed with. In addition, fabrication is facilitated by the use of the multilayer circuit board. In this case, a multilayer printed circuit board is understood to be a printed circuit board which has electrical conductor tracks in at least two planes, for example on its upper side facing the plug socket and its lower side facing away from the plug socket. Multi-layer circuit boards of this kind are known to the skilled worker as so-called "multi-layers".

In order to counteract a capacitive coupling of conductors of different conductor pairs in the region of the contact elements, the printed circuit board carries compensating capacitors for the capacitive coupling of conductors of different conductor pairs. By means of the compensation capacitors, a capacitive counter-coupling is provided in the region of the circuit board, by means of which the signal coupling between different conductor pairs can be reduced.

The plug-in socket according to the invention also has means for inductive feedback. For this purpose, the course of the conductor tracks, which at least form the conductors of two conductor pairs, is selected such that an inductive coupling in a second conductor track section counteracts an inductive coupling in the region of the contact elements and in the region of a first conductor track section. Overall, the inductive coupling between different conductor pairs can thereby be reduced. While in a first conductor track section, a first conductor track of a first conductor pair has a stronger inductive coupling to a first conductor track of the second conductor pair than to the second conductor track of the second conductor pair, the inductive coupling is just reversed in the second conductor track section, ie the first conductor track of the second conductor track section First conductor pair has a stronger inductive coupling to the second conductor track of the second conductor pair than to the first conductor conductor of the second conductor pair.

Due to the combined use of compensation capacitors arranged on the printed circuit board and a conductor track guide, which allows an inductive counter-coupling, the signal coupling between different conductor pairs can be kept very small in the electrical plug-in socket according to the invention. This makes it possible to use the socket according to the invention also for the transmission of very high-frequency signals.

According to the invention, the conductor tracks of the first and second conductor pairs have a path path such that they overlap without contact in a common intersection point. The four conductor tracks, which form the first and second conductor pairs, are thus combined to form a common point of intersection, in which they overlap without contact. In the region of the point of intersection, the four conductor tracks can overall form a star-shaped path profile.

It is advantageous if the first conductor track section directly adjoins the contact springs.

In order to achieve a particularly effective inductive counter coupling, it is advantageous if the first conductor track section is shorter than the second conductor track section. In the first conductor track section, the spatial arrangement of the conductor tracks essentially corresponds to the arrangement of the contact elements, which can be contacted by the assigned plug-in contacts of the connecting plug. An inductive coupling between conductors of different conductor pairs occurs both in the region of the contact elements and in the region of the first conductor track section. In order to keep this inductive coupling as small as possible, it is advantageous to select the length of the first conductor track section to be very small while the length of the second conductor track section, in which an inductive counter coupling is effected, is selected to be larger.

A capacitive coupling between conductors of different conductor pairs occurs not only in the region of the compensation capacitors and in the region of the contact elements, but also in the region of the conductor tracks, although their capacitive coupling is less than the capacitive coupling which is achieved with the compensation capacitors. It has been shown that a particularly good inductive and capacitive feedback can be achieved in the region of the printed circuit board when the conductor tracks of the first and second conductor pairs in the second conductor track section are arranged at the corner points of a rectangle in the rectangle in relation to the cross section of the multilayer printed circuit board.

The printed circuit board is preferably designed in four layers, the conductor tracks of the first and second conductor pairs running in at least one plane of the printed circuit board at least in the second conductor track section. In such an embodiment, the four conductor tracks which form the first and second conductor pairs are arranged in the region of the second conductor track section in each case in one plane of the four-layer printed circuit board.

In a particularly preferred embodiment, the conductor tracks of the first and second conductor pairs in the second conductor track section are arranged at the corner points of a square in relation to the cross-section of the printed circuit board. Surprisingly, it has been found that by such an arrangement of the conductor tracks in the region of the second conductor track section, the inductive and capacitive signal coupling of the electrical plug-in socket can be kept particularly low.

In order to achieve the arrangement according to the invention of the conductor tracks with the different distances described above in the first and second conductor track sections in a structurally simple manner, it is advantageous if the conductor tracks at least one conductor pair between the first and second conductor track sections overlap without contact.

A particularly low signal coupling between conductors of different conductor pairs can be achieved by the conductor paths of different conductor pairs overlapping each other in a single intersection without contact. In such an embodiment, the path of the conductor tracks is selected such that the conductor paths of different conductor pairs have only a single intersection point, whereas otherwise only conductor paths of the conductor pairs overlap without contact, but a further intersection of conductor paths of different conductor pairs is not present.

Preferably, the conductor tracks are aligned parallel to one another in a region adjoining the common intersection point. In this case, it is of particular advantage if the conductor tracks do not overlap in this parallel-oriented region, but are offset with respect to one another.

As already explained, in the electrical plug-in connector the contact elements are inserted into the printed circuit board. In this connection, it has proven to be advantageous if the contact elements are pressed into the printed circuit board.

The contact elements preferably pass through the printed circuit board. This improves the mechanical stability of the contact module. In addition, this results in the possibility of connecting at least some of the contact elements on the underside of the printed circuit board facing away from the plug bay with further connecting elements so that these contact elements in the region of the printed circuit board each form an electrical conductor which is integrally connected to the assigned contact spring.

In order to give the contact elements, on the one hand, the necessary mechanical stability and, on the other hand, ensure that the end regions of the contact elements protruding beyond the top face facing the plug shaft do not show a permanent deformation even with a short spring length, it is advantageous for at least some of the contact elements to be made of a Spring steel.

As already explained, the contact springs can be kept very short. It has proved to be particularly advantageous if the end regions of the contact elements, ie the contact springs, which extend over the upper side of the circuit board, have a length of at most 4 mm, preferably a length of approximately 3 mm.

In the electrical plug-in socket according to the invention, the printed circuit board carries a plurality of compensating capacitors. It has proved to be particularly advantageous if the compensating capacitors are in each case formed by two electrically conductive layer regions which are arranged opposite one another and are arranged in different planes of the multilayer printed circuit board. The compensation capacitors are designed in this case in the form of plate capacitors, the capacitor plates being in each case formed by a conductive layer region of the multilayer printed circuit board. This makes possible a particularly compact construction of the contact module, whereby a disturbing signal coupling can be kept very small. The capacitance of the compensation capacitors can be predetermined by the distance between the opposing electrically conductive layer regions as well as by the size of the layer regions and the dielectric constant of the material of the circuit board.

It has been found that a particularly good transmission quality can be achieved if the compensating capacitors are arranged in the region of the printed circuit board directly adjacent to the contact springs.

The danger of interfering signal coupling between different conductor pairs decreases with increasing distance of the conductor pairs. The coupling of pairs of conductors arranged directly adjacent to each other is therefore of particular importance. In a preferred embodiment, it is therefore provided that each conductor pair is coupled to the directly adjacent conductor pair via at least one compensation capacitor. By means of the compensation capacitors, the disturbing capacitive coupling of the conductor pairs can at least be partially compensated for. Thus, a signal coupling at the data transmission rates used can be kept small by appropriate dimensioning of the compensation capacitors.

In an advantageous embodiment, the printed circuit board is configured to be three-layered, ie, the printed circuit board carries conductor tracks, which run in three planes arranged at a distance from one another. It is particularly favorable if the planes in which the conductor tracks are arranged are positioned at different distances from one another. For example, an asymmetrically designed printed circuit board can be used in such a way that the circuit board carries electrical conductor tracks on its upper side and on its underside, and that conductor tracks extend in an intermediate plane, the intermediate plane having different distances from the upper side and the lower side.

The use of a printed circuit board with several layers arranged at different distances from one another makes it possible, in particular, to choose a relatively large spacing for the conductor paths which cross over one another without contact, whereas the distance between the electrically conductive layer regions, which respectively form a capacitor plate, can be selected to be smaller.

In the case of a three-layer printed circuit board, it has been found to be advantageous if the distance between the intermediate plane and the upper side is approximately one quarter to one third of the total thickness of the printed circuit board.

As already explained, in one advantageous embodiment, a four-layer printed circuit board is used. In this case, it is favorable if the two central planes have an approximately twice as large spacing from each other as to the respectively immediately adjacent outer plane, that is to say the upper or lower side of the printed circuit board.

In a particularly preferred embodiment of the electrical plug-in connector, the printed circuit board carries, on its underside facing away from the plug-in socket, a plurality of pairs of connecting elements which are each assigned to a conductor pair, the pairs of connecting elements being positioned at a distance from each other. The connecting elements can be oriented perpendicularly to the underside of the printed circuit board, but an oblique orientation can also be used, for example at an angle of 45 ° or 60 ° to the underside of the printed circuit board. The mutually spaced connection elements simplify the connection of further connecting elements to the printed circuit board. For example, it may be provided that the connecting elements each form a contact. In this case, the connecting elements can have a greater spacing from one another than the contact springs arranged on the front side of the circuit board.

The use of a circuit board with contact springs arranged at the top and connection elements arranged at the bottom makes it possible, in particular, to design the contact module as a decoupling element which has all components for the inductive and capacitive feedback of the conductor pairs, in particular compensating capacitors and conductor track sections with interchanged distances between the conductor paths of different conductor pairs No further electrical elements must be used for the contact module in order to compensate for a disturbing electrical signal coupling.

In a particularly cost-effective embodiment, the connecting elements are inserted into the printed circuit board, preferably pressed in.

It is advantageous if the connecting elements and the contact elements are formed as contact pins pressed into the printed circuit board, some contact pins protruding beyond the side facing the plug shaft and forming the contact springs and some contact pins protruding beyond the side of the circuit board facing away from the plug shaft and contacts for connection Of connecting elements. The contact pins can, for example, be pressed into the printed circuit board provided with through-bores in the form of stamped contact strips. Subsequently, the protruding end regions of the contact pins can either be separated off, or they are bent off in the region of the top side of the circuit board and form contact springs, and protruding contact pins can form contacts in the region of the bottom side of the circuit board for connection of connecting elements. The protrusion of the contact pins can be aligned perpendicularly to the underside of the printed circuit board. If necessary, the projection can also be chamfered, for example at an angle of 45 ° to the underside of the printed circuit board. This makes it possible to produce electrical plug-in connectors with different orientation of the plug shafts relative to the mounting side of the plug-in sockets, whereby contact modules can be used for the plug-in sockets which differ only in the orientation of the contact pin's bottom projections but otherwise have an identical design .

Preferably, the contact pins projecting beyond the upper side of the circuit board form a contact arrangement with eight contact springs arranged side by side. The use of eight juxtaposed contact springs has proven itself with telephone connections. For reasons of economy, convenience and standardization, this embodiment has also been used for the transmission of data with higher data transmission rates, and it is intended to use such configured contact arrangements also at data transmission rates of more than 100 Mbit / s. According to an international standard (ANSI / EIA / TIA-578-1991), the individual contact springs are assigned in such a way that the two outer contact springs are assigned to a pair of conductors on both sides of the contact arrangement; the two central contact springs of the contact arrangement are assigned to a further pair of conductors , And that the contact springs arranged between two outer and two central contact springs are assigned to a further pair of conductors for the transmission of a high-frequency electrical signal.

The contact pins protruding beyond the underside of the circuit board preferably form a connection arrangement comprising four mutually spaced-apart pairs of contacts to which, for example, further connecting elements can be soldered. In this case, the four pairs can be arranged at the corner points of a rectangle so that they are very easily accessible for connecting the printed circuit board to further connecting elements, for example to further printed circuit boards or also to connecting leads. Due to the large spatial spacing of the contact pairs, mutual parasitic couplings are largely avoided.

The following description of preferred embodiments of the invention is described in more detail with reference to the drawing. Show it:<dl id="dl0001"><dt>FIG. 1:</dt><dd>4 shows a perspective illustration of an electrical plug-in socket according to a first embodiment according to the invention;</dd><dt>FIG. 2:</dt><dd>3 is a sectional view of the electrical plug-in socket of FIG. 1;</dd><dt>FIG. 3:</dt><dd>1 shows a view obliquely from above on a contact module of the plug-in socket of FIG. 1;</dd><dt>FIG. 4:</dt><dd>1 shows a view obliquely from below of the contact module of the plug-in socket of FIG. 1;</dd><dt>FIG. 5:</dt><dd>A partial sectional view of a printed circuit board of a contact module;</dd><dt>FIG. 6:</dt><dd>5 shows a representation of the arrangement of the conductor tracks of the circuit board;</dd><dt>FIG. 7:</dt><dd>8 shows a sectional view of an embodiment of a printed circuit board of the contact module according to the invention taken along line 7-7 in FIG. 8;</dd><dt>FIG. 8:</dt><dd>7 shows a representation of the arrangement of the conductor tracks of the printed circuit board from FIG. 7;</dd><dt>FIG. 9:</dt><dd>4 shows a perspective illustration of an electrical plug-in socket according to a further embodiment, and FIG </dd><dt>FIG. 10:</dt><dd>9 is a sectional view of the electrical plug-in socket.</dd></dl>

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 to 6 show schematically a first embodiment of an electrical plug-in socket, which is occupied overall by the reference numeral 10 and is constructed in the manner of a module and has a housing 11 which has a front side 13 oriented at an angle of 45 ° to a mounting side 12, A plug connector 14 opens for receiving an electrical connection plug, which is assigned to the plug-in connector 10. Such connecting connectors are known and are therefore not shown in the drawing. On the mounting side 12 several detent elements are molded onto the housing 11, with the aid of which the plug-in socket 10 can be snapped onto a carrier.

The housing 11 comprises a mounting shaft 15, which opens into the mounting side 12 and into which a contact module 17 is inserted.

3 and 4, the contact module 17 comprises a printed circuit board 19. In the passage holes of the printed circuit board 19 explained in more detail below, a total of 14 contact pins 20 to 33 are injected, each of which passes through the circuit board 19. The contact pins 20 to 29 are arranged in a row next to one another, eight contact pins, namely the contact pins 21 to 28, protruding beyond the upper side 35 of the printed circuit board 19 facing the plug shaft 14 and forming contact elements with protruding end regions in the form of contact springs 37 oriented obliquely with respect to the upper side 35 , Which can each be contacted by an associated plug-in contact of the connecting plug, which is not shown in the drawing, when the connecting plug is inserted into the plug shaft.

Of the contact pins 20 to 22 arranged side by side in a row, the contact pins 20, 22 as well as 27 and 29 protrude clearly beyond the underside 39 of the printed circuit board 19 remote from the plug shaft 14, and the contact pins 30, 31 and 32, Bottom 39. *** " With their protruding end regions, these contact pins on the underside 39 of the printed circuit board 19 each form a connecting element with a contact 41, to which, for example, a further connecting element can be soldered. A further possible connection would be, for example, the pressing of the contacts 41 into a printed circuit board.

The contact pins 21 to 28 each forming a contact spring 37 are made of spring steel so that the contact springs 37 can be spring-elastically bent during the contacting of the connecting plug. The remaining contact pins 20, 29 and 30 to 33 can also be made of spring steel or else from another electrically conductive material.

The printed circuit board 19 is designed in several layers as a so-called asymmetric multi-layer. This is clear in particular from FIG. On its upper side 35, as well as on its underside 39, and additionally in an intermediate layer 43, it carries electrical conductor tracks. The distance between the intermediate layer 43 and the upper side 35 is considerably less than the distance between the intermediate layer 43 and the lower side 39, and the distance from the upper side is preferably approximately 0.36 mm while the distance from the lower side is approximately 1.14 mm . The total thickness of the circuit board 19 thus amounts to approximately 1.5 mm.

The course of the conductor tracks of the circuit board 19 becomes clear from the layout shown in FIG. In FIG. 6, conductor tracks running along the upper side 35 of the printed circuit board 19 are shown in the solid line, while conductor tracks running in the intermediate layer 43 or along the lower side 39 are shown in dot-dashed lines in FIG. The printed circuit board 19 has, in a row, juxtaposed through-holes 50 to 59 which each receive a contact pin 20 to 29. In addition, the circuit board 19 includes through holes 60 to 63 which receive the contact pins 30 to 33. All through-holes 50 to 63 are each provided with electrically conductive sleeves, which are not shown in the drawing and which in turn accommodate the contact pins 20 to 33. In addition, the circuit board 19 has a through-

The through-hole 50 is connected to the adjacent through-hole 51 via a conductor arranged on the upper side 35 of the printed circuit board, from which a conductor track extends to an electrically conductive layer region in the form of a capacitor field 66 arranged in the intermediate layer 43. Above the rectangularly configured capacitor field 66, a correspondingly formed layer region in the form of a capacitor field 67 is arranged on the upper side 35 of the printed circuit board 19 and is connected to the through-bore 53 via a conductor track. The two capacitor fields 66 and 67 form a compensation capacitor.

A conductor track 69 extends from the through-hole 53 to the through-hole 60 on the underside 39 of the printed circuit board 19, and the through-hole 53 is electrically connected to a capacitor field 71 arranged in the intermediate layer 43. A capacitor field 72, which is arranged on the upper side 35, is connected to the capacitor field 71 and is connected to the through-hole 55 via a conductor track.

A conductor track 74 extends from the through-bore 55 on the underside 39, via which the through-bore 55 is in electrical connection with the through-bore 63. The conductor track 74 is intersected twice by a conductor 75 which connects between the through-hole 54 and the through-hole 62. The conductor track 75 runs in a first part on the upper side 35 while a second part is arranged on the bottom side 39, A contacting 76 is connected to the first part. The through-hole 54 is additionally connected via a conductor track to a capacitor field 78 arranged in the intermediate layer 43, to which a corresponding capacitor field 79, which is in electrical connection with the through-bore 56, is assigned on the upper side 35 of the printed circuit board 19. The through-bore 56 is connected to the through-bore 61 via a conductor track 81. The conductor track 81 runs on the upper side 35 of the printed circuit board 19 and overlaps the conductor tracks 74 and 69 arranged below and the second section of the conductor track 75, which is also arranged on the underside 39 of the printed circuit board 19.

The through-bore 56 is also in electrical connection with a capacitor field 83 which is arranged in the intermediate layer 43 and which is assigned a capacitor field 84 on the upper side 35 which is connected to the through-bore 58. The through-bore 58 is additionally connected to the through-bore 59 via a conductor track.

As already explained, the capacitor fields 66, 67 disposed one above the other form, as well as the capacitor fields 71, 72 and 78, 79 as well as 83, 84, respectively, a compensating capacitor with the aid of which disturbing capacitive couplings between the contact springs 37 can be compensated for.

The two through-holes 54 and 55 arranged centrally in the row of the through-holes 50 to 59 are assigned to a first pair of conductors for transmitting high-frequency electrical signals in accordance with the already-mentioned international standard. The passage holes 53 and 56, which are arranged directly adjacent, are assigned to a second conductor pair, and the two externally located through-holes 51, 52 and 57, 58 are each assigned to a further conductor pair. The pair of conductors corresponding to the through holes 57 and 58 is coupled to the pair of conductors, which is associated with the through-holes 53 and 56, via the compensation capacitor formed by the capacitor fields 83 and 84. The conductor pair corresponding to the through-bores 51 and 52 is also coupled to the last-mentioned conductor pair via the compensation capacitor formed by the capacitor fields 66 and 67. In order to take account of the capacitive coupling between the conductor pair corresponding to the through-holes 53 and 56 and the conductor pair corresponding to the two central through-holes 54 and 55, the compensating capacitors, which are formed by the capacitor fields 71 ​​and 72 or 78, 79, are used.

As already mentioned, the conductor track 74 is intersected twice by the conductor track 75, namely in a first intersection point S1, which is arranged immediately adjacent to the through-holes 54, 55, and in a second intersection point S2, which is positioned at a distance from the first intersection point S1 . The conductor strips 74 and 75 form a first conductor pair which connects the through-holes 54, 55, which receive the contact pins 24 and 25, respectively, to the through-holes 62 and 63, into which the contact pins 32 and 33 are inserted. The directly adjacent conductor tracks 69 and 81 form a second conductor pair, via which the through-holes 53 and 56 are connected to the through-bores 60 and 61, respectively. The overlapping of the conductor tracks 74 and 75 at the intersection S1 changes the relative position of these two conductor tracks to the adjacent conductor tracks 69 and 81 in such a way that the conductor track 74 has a smaller length in a first conductor track section which extends between the through-bore 55 and the intersection point S1 Distance from the conductor track 81 than to the conductor track 69, while the distance between the conductor track 74 and the conductor track 69 in a second conductor track section which extends from the point of intersection S1 to the intersection point S2 is less than to the conductor track 81. The same applies to the conductor track 75, In the first conductor track section, that is to say in the region between the through-hole 54 and the intersection point S1, has a smaller distance from the conductor track 69 than to the conductor track 81, whereas in the second conductor track section, ie between the two intersection points S1 and S2, To the conductor track 69. Since the inductive coupling between the conductor pairs 74, 75 and 69, 81 depends on the distance between the conductor tracks 74, 75, which form a first conductor pair, to the conductor tracks 69, 81 which form a second conductor pair, The inductive coupling of the conductors in the region of the contact pins 24, 25 and in the region of the first conductor track portion occurs in the region of the contact pins 24, 25 in the second conductor track section compared to the arrangement which they occupy in the first conductor track section First conductor pair 74, 75 to the conductors of the second conductor pair 69, 81 is largely compensated by an inductive negative feedback in the region of the second conductor track section.

The tapping of the electrical signals which are fed to the plug-in connector 10 via the connecting plug, which is not shown in the drawing, takes place from the underside 39 of the printed circuit board 19. In this case, two directly adjacent contacts 41 form a pair of contacts which is assigned to one of the conductor pairs mentioned above Is. The connection pairs are arranged at a distance from one another at the corner points of a rectangle. This is clear in particular from FIG. It can also be seen from FIGS. 3 and 4 that the mutual spacing between the contact springs 37 contacting a plug contact of the connecting plug is comparatively small while the distance between the contacts 41 is selected to be larger so that the contacts 41 are easily accessible for the purpose of connecting further connecting elements .

From the foregoing, it becomes clear that the contact module 17 with the printed circuit board 19 and the contact pins 20 to 33 forms an inductive and capacitive decoupling element which is contactable by the connecting plug and carries contacts 41 arranged in pairs in pairs, one contact pair A pair of conductors for transmitting high-frequency electrical signals.

In FIGS. 7 and 8, an embodiment according to the invention of a printed circuit board, generally designated by the reference numeral 119, is shown. This is similar to the circuit board 19. Therefore, the same reference numerals as in FIG. 6 are used for identical or equivalent components in FIG. 8, and reference is hereby made to the preceding explanations for the purpose of avoiding repetitions.

The printed circuit board 119 is four-layered and comprises an upper layer 121, a lower layer 122, an upper intermediate layer 123 and a lower intermediate layer 124. The distance between the two intermediate layers 123, 124 is approximately twice as great as the distance between the intermediate layers 123, 124 to the respectively directly adjacent top and bottom layers 121, 122, respectively. Thus, the distance between the two intermediate layers is preferably approximately 0.71 mm, while the distance of each intermediate layer 123, 124 to the immediately adjacent upper or lower layer is approximately 0.36 mm.

The printed circuit board 119 also has the through-holes 50 to 59 already described above with reference to FIG. 6, which are arranged side by side in series and each receive a contact pin 20 to 29. In addition, the circuit board 119 also includes through holes 60 to 63 which receive the contact pins 30 to 33. Again, the through-holes 50 to 63 are each provided with sleeves, not shown in the drawing, which in turn receive the abovementioned contact pins 20 to 33. Also in the circuit board 119, a continuous bearing securing bore 64 is used.

The printed circuit board 119 also carries the contact fields 66, 67 and 71, 72 and 78, 79 and 83, 84, which have already been explained in detail with reference to FIG. 6, which form a compensation capacitor for the capacitive feedback. The capacitor fields 66, 72, 79 and 83 are arranged on the upper layer 121 of the four-layer printed circuit board 119, while the respectively assigned capacitor fields 67, 71, 78 and 84 are arranged on the upper intermediate layer 123. The electrical connection of the capacitor fields to the respective through-holes is identical to the corresponding connections in the printed circuit board 19. In order to avoid repetitions, reference is made here to the preceding explanations.

The circuit board 119 differs from the circuit board 19 essentially in that the conductor tracks, through which the through-holes 53, 54, 55 and 56 are electrically connected to the through-bores 60, 63, 62 and 61, respectively, have a different path. In FIG. 8, the conductor tracks running on the upper layer 121 are shown in a solid line, the conductor tracks running on the upper intermediate layer 123 are shown by dashed lines, the conductor tracks running on the lower intermediate layer 124 are indicated by dashed lines and the conductor tracks running on the sublayer 122 are double-dotted Respectively. The through-bore 53 is in electrical connection with the through-hole 60 via a conductor track 169, and the through-bore 56 is connected to the through-bore 61 via a conductor track 181. These two conductor tracks 169 and 181 form a pair of conductors for the transmission of a high-frequency electrical signal in a corresponding manner, as already explained above with reference to FIG. 6 in connection with the conductor tracks 69 and 81.

The through hole 54 is connected via a conductive trace 174 to the through bore 63 in electrical connection, and the through hole 55 is ver via a conductor track 175 with the through hole 62 prevented. The interconnects 174 and 175 also form a pair of conductors for transmitting a high-frequency electrical signal. The conductor tracks 169, 181, 174, 175 extend in each case in one plane of the printed circuit board 119, the conductor track 169 runs on the upper intermediate layer 123, the conductor track 181 runs on the underlayer 122, the conductor track 174 runs on the lower intermediate layer 124, The conductor track 175 runs on the upper layer 121. This is clear in particular from FIG.

As can be seen from FIG. 8, the conductor tracks 169, 181, 174 and 175 are merged from the respective through-bores 53, 56, 54 and 55, respectively, to form a single common intersection point S, in which they overlap without contact. The short region between the respective through-bores and the point of intersection S forms a first conductor track section. A second conductor track section, in which the conductor tracks 169, 181, 174 and 175 are aligned parallel to each other, adjoins the point of intersection S. A third conductor track section adjoins the through-bores 60 to 63 in the second conductor track section, in which the conductor tracks 169 and 181 or 174 and 175, respectively, forming pairs of conductors pair each pair, wherein the different conductor pairs 169, 181 on the one hand, and 174, 175 On the other hand.

As already explained with reference to FIG. 6, the capacitor fields 66, 67; 71, 72; 78, 79; 83, 84, a compensation capacitor is provided, with the aid of which a capacitive coupling between conductors of different conductor pairs occurring in the region of the contact springs 37 can be counteracted. An inductive counter-coupling between the first conductor pair, which is assigned to the through-holes 54, 55, and the second conductor pair, which is assigned to the through-holes 53 and 56, is determined by the arrangement of the conductor tracks 169, 181 and 174, 175 in their first and second conductor track sections As has already been explained with reference to the conductor paths 69, 74, 75 and 81. The distance of a first conductor track of the first conductor pair 174, 175 to a first conductor track of the second conductor pair 169, 181 is reduced in the first conductor track section, ie, in the region between the through holes 53 to 56 and the intersection point S Is the distance which the respective conductor track in the second conductor track section has to the corresponding conductor track of the second conductor pair. The distance of the conductor track 174 from the conductor track 169 is less than the conductor track 181, while the distance between the conductor track 174 and the conductor track 181 in the second conductor track section is less than the conductor track 169. This is clear in particular from FIG. The same applies to the conductor track 175, which in the first conductor track section has a smaller spacing from the conductor track 181 than to the conductor track 169, whereas in the second conductor track section it has a smaller spacing from the conductor track 169 than to the conductor track 181. As a result of the reversal of the distances which the conductor paths of different conductor pairs have in the first and second conductor track sections, an effective inductive feedback is achieved so that the signal coupling, which is unavoidable in the region of the contact springs 37, can be effectively compensated for.

7, the conductor tracks 174, 175, 169 and 181 are arranged at the corner points of a square in the area of ​​the second conductor track section in relation to the cross-section of the printed circuit board 119. The shortest distance of a conductor track to an adjacent conductor track thereby corresponds to a side length of the square. For example, the distance which the conductor track 175 has in the area of ​​the second conductor track section to the conductor track 169 is less than the distance which the conductor track 175 takes in this area to the conductor track 181. This is immediately apparent from FIG. It has been shown that by means of such an arrangement a particularly small signal coupling can be ensured.

The connections of the printed circuit board 119 are identical with the terminals of the printed circuit board 19. Thus, the contact module 17 can optionally be configured with the printed circuit board 19 or with the printed circuit board 119.

FIGS. 9 and 10 schematically show a further embodiment of a plug-in socket according to the invention, which is designated by the reference numeral 110 in its entirety. It comprises a housing 111 whose front side 113 is oriented perpendicular to its mounting side 112. Otherwise, the plug-in socket 110 has the same structure as the plug-in connector 10 described above, so that the same reference symbols are used for identical components as in FIGS. 1 to 6. In order to avoid repetitions, reference is hereby made to the preceding explanations in their entirety.

The housing 111 of the plug-in socket 110 also has a mounting bay 15 on the mounting side, into which a contact module 117 is inserted. This is largely identical to the contact module 17 described above and differs therefrom only in that the connecting elements projecting from the printed circuit board 19 of the contact module 117 are aligned in the form of the contacts 41 perpendicular to the underside of the printed circuit board 19, Of the plug-in socket 10 are oriented at an angle of 45 ° to the underside 39. Alternatively, the printed circuit board 119 may also be used in the contact module 117 instead of the printed circuit board 19.

The same contact modules 17 can also be used for the production of the plug-in connector 110, as are also used with the plug-in connector 10, whereby only one last mounting step of the contact modules 17, namely the chamfering of the contacts 41, which protrude at the bottom from the printed circuit board 19 or 119, So that they thus maintain their orientation, which is assumed during the pressing into the corresponding through-holes of the printed circuit board 19 or 119, unchanged. The production costs for the plug-in sockets 10 and 110 can thereby be reduced considerably.