EP2375511B1 - Contact field for connector - Google Patents

Description

The invention relates to a contact field for connectors.

In network technology, a problem of near-end crosstalk and of reflections on connectors arises in particular as the transmission speed increases.
Especially with the popular twisted pair cabling, which exemplifies in FIG. 1 is shown schematically, there is a near-crosstalk problem between certain wire pairs,
Typically, in a typical twisted-pair cabling, a first pair of wires 11, which is often coded blue, blue-white, is associated with contacts 24 and 25 of a plug-in housing 5. Similarly, a second pair of wires 12, which is often orange, orange-white coded, contacts 21 and 22 of a plug-in housing 5 assigned. A third wire pair 13, which is often coded green, green-white, contacts 23 and 26 and a fourth wire pair 14, which is often brown, brown-white coded, contacts 27 and 28 of a plug-in housing 5 assigned.
In particular, the third wire pair 13 leads due to its widely spaced assignment to contacts 23 and 26 in the other wire pairs to increased near-end crosstalk, which is favored by parallel surfaces of the wire pairs to each other.
The contacts of the connectors known from the prior art are predominantly made of wire. If wires for the contact surface are also used on the corresponding counterpart to the connector, contact difficulties often occur, since often only one point contact comes about. These contact difficulties are one of the causes of reflections.
However, attempts to counteract this effect through contact surfaces have always resulted in increased near-end crosstalk in the past.
A contact pad according to the preamble of claim 1 is known from WO 97/01874 and also from the US 2003/0139094 A1 known. DE 201 05 207 U1 discloses a connector with offset lead portions. The invention has set itself the goal of avoiding at least one of the aforementioned disadvantages in an inventive manner.
This object is achieved by a contact pad for a connector for twisted pair cabling comprising a plurality of metallic contacts for connection to a twisted pair socket, each metallic contact having a lead portion for connection to a circuit board, wherein the metallic contacts Contact sheets are formed, at least two of the lead portions are arranged offset to other lead portions, and the metallic contacts are made similar, and the third and sixth lead portion of the lead portions are arranged offset to adjacent lead portions.
In one embodiment of the invention, the contact pad has eight metallic contacts, so that a twisted pair cabling for common systems of telecommunications, communications and computer technology, such as ISDN and Ethernet cabling, can be provided.
In yet another embodiment of the invention, the contacts and the respective lead portions are made in one piece.
In yet another embodiment of the invention, the contact pad is an RJ 45 contact pad.

• Figur 1 die schematische Zuordnung von Adernpaaren einer Twisted-Pair-Verkabelung zu den Kontakten eines Twisted-Pair Steckfeldes, insbesondere eines RJ46-Steckers,

In yet another embodiment of the invention, the contact pad further comprises a housing made of insulating material.
In yet another embodiment of the invention, the contact pad is part of a printed circuit board connector.
In the following, the invention will be explained in more detail with reference to the figures. In these shows

• FIG. 1 the schematic assignment of wire pairs of a twisted pair cabling to the contacts of a twisted pair patch panel, in particular an RJ46 plug,

The contact to the board can by means of a board connection 7, for example in the form of a Lötnase - see FIG. 4 - Or for surface mounting as it is known from the SMD technology by providing a correspondingly curved surface can be achieved.

Again, by a corresponding placement of the board connector 7, the parallel surface can be further reduced. This can be very easy in FIG. 4 be seen.

In the FIG. 4 Various embodiments of inventive contact sheets are shown.

On the extreme left upper half of an L-shaped embodiment of a contact plate 4 is shown schematically. In the upper area is colored black the contact area 8, which serves to make contact with a socket. Following this, the supply line section 6 is followed by a board connection 7.

In the middle left upper half of a corresponding C-shaped embodiment is shown. In the upper area is colored black the contact area 8, which serves to make contact with a socket. Following this, the supply line section 6 is followed by a board connection 7.

Under the two upper left embodiments, the staggered arrangement of the same embodiment is shown. As can be clearly seen, the sections 6 of the respective upper illustration are offset from the lower illustration. The same applies to the board connections 7, which are also arranged offset. In this way, by means of a single form of contact plates 4, both arrangements can be realized. However, the invention is not limited thereto.

As you can see on the right half of Figure 4 sees, different embodiments of contact plates 4 can be combined with each other to achieve an offset arrangement of the lead portions 6.

In the middle right half of an L-shaped embodiment of a contact plate 4 is shown in comparison to an I-shaped embodiment. Again, the contact areas 8 are colored black here.

In the extreme right half a C-shaped embodiment of a contact plate 4 is shown in comparison to an I-shaped embodiment. Again, the contact areas 8 are colored black here.

It is readily apparent that the respective lead portions of the upper half are offset from the lead portions of the lower half. The same applies to the board connections 7, which are also arranged offset.

It is readily apparent that, of course, mixed forms of L-shaped and C-shaped contact plates 6 lead to the same result.

It is essential that at least parts of the feed section 6 are not parallel to one another.

By these staggered arrangements, the near-end crosstalk can be reduced.

Furthermore, the use of contact plates allows a stable connection to the corresponding counterpart of the connector, so that - even if this counterpart should be equipped with wires - now an improved contact can be made, since now the wire can create almost flat against the contact plate, which an enlarged contact surface is created.

Hereby, the invention makes it possible to effectively solve one or more of the aforementioned problems. In particular, the invention solves the previous contrast, which precluded the use of sheets for planar contacts in view of a previously recorded increased near-end crosstalk.

In one embodiment of the invention, the contact pad has eight metallic contacts 4, so that a twisted pair cabling for common systems of telecommunications, communications and computer technology, such as ISDN and Ethernet cabling, can be provided. Typically, the contact pad is then an RJ45 contact pad.

The invention makes it possible to provide connectors which meet the specification according to CAT6a and higher.

In yet another embodiment of the invention, the contact pad further comprises a housing 5 made of insulating material.

This housing 5 serves as a receptacle for the contacts and can, for example, provide the metallic contacts 4 as a plug-in field, while on the other side it can have corresponding tabs for a print mounting on a circuit board 2.

It is particularly preferred that the metallic contacts are integral and similar, e.g. L-shaped or C-shaped, are executed.

In the Figures 2 and 3 is an L-shaped design shown.

This proves, as well as the C-shaped design, as particularly suitable, since this only a single punching tool is required for all contacts and the offset contacts can be achieved by a 180 ° rotated arrangement of the L-shaped piece of sheet metal.

By the L-shaped design, on the one hand, a staggered arrangement on the board 2 is achieved, as well as minimizes the parallel surface. Furthermore, the L-shape allows a mechanically stable design of the contacts.

In a preferred manufacturing process 5 contact plates 4 are used in a housing. When inserting the orientation of the contact plates 4 is taken into account, i. with a RJ45 plug, the 3rd and 6th contacts are turned through 180 ° to the other contacts.

The insertion itself can be a press-fit. Other measures for fixing the contacts in the housing 5 are of course also usable.

Subsequently, the resulting contact field is connected as a board connector with a structurally processed board 2. Such a board 2 can also be further contact fields 3 for the connection with the pairs of wires 11, 12, 13, 14 and a further wiring, e.g. compensation networks, security elements or the like.

For this purpose, the board connection 7 can be designed as pin contacts for insertion into corresponding solder openings of a board 2.

In an alternative embodiment, the board connection 7 may be designed for surface soldering on corresponding solder pads of a board 2.

LIST OF REFERENCE NUMBERS

1

Connector details

2

circuit board

4

metallic contacts

5

casing

6

lead portions

7

board connector

8th

contact area

11 to 14

pairs

21 to 28

contacts

Claims (6)

1. A contact field for a plug-in connection for twisted-pair cabling, having a plurality of metallic contacts (4) for connection to a twisted-pair socket, wherein each metallic contact (4) has a feed line portion (6) for connection to a printed circuit board (2), wherein

   • the metallic contacts (4) are formed from contact plates,

   • at least two of the feed line portions (6; 23, 26) are arranged offset in relation to other feed line portions (6; 21, 22, 24, 25, 27, 28), and

   • the metallic contacts (4) are identical.

   characterised in that
   the third and sixth feed line portion of the feed line portions (23, 26) are arranged offset in relation to adjacent feed line portions (22, 24, 25, 27).
2. The contact field according to claim 1, characterised in that the contact field has eight metallic contacts (4).
3. The contact field according to either one of the preceding claims, characterised in that the contacts (4) and the corresponding feed line portions (6) are formed in one piece.
4. The contact field according to any one of the preceding claims, characterised in that the contact field is an RJ 45 contact field.
5. The contact field according to any one of the preceding claims, characterised in that the contact field also has a housing made of insulating material.
6. The contact field according to any one of the preceding claims, characterised in that the contact field is part of a print panel plug.

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