EP0598192A1 - Signal-connector with capacitive adjustment for improved crosstalk parameters - Google Patents

Abstract

The invention relates to an electrical plug connector for telecommunications (information) and data technology having RJ contacts arranged in the housing, having insulation-piercing terminal contacts, and having contact strips connecting them. The object of the invention, to improve an electrical plug connector of the generic type such that its electrical parameters are considerably improved and the requirements for the transmission of high data rates are satisified, is achieved in that the contact strips are partially bent a plurality of times between the RJ contacts and the insulation-piercing terminal contacts and are partially not guided in a plane parallel to one another, at least in the contact tongue region. <IMAGE>

Description

The invention relates to an electrical connector for communications and data technology according to the preamble of claim 1.

A connector of the generic type is previously known from EP 0.445.376 A1. This consists of a housing with a receiving chamber for a plug, a first set of contacts using insulation displacement technology and a second set of contacts connected to the first set (RJ contacts) made of elongated contact strips which are introduced into grooves in the upper part of the housing are parallel and close together are guided to each other up to the receiving chamber in which the plug (RJ plug) can be inserted. The contact strips, which run parallel to one another over long distances and at very short distances from one another, have the effect that a capacitor effect arises between the contact tracks, which leads, inter alia, to a deterioration in the values of the cross-talk or crosstalk attenuation.

US Pat. No. 5,186,647 describes an electrical connector for use in the high-frequency range with likewise parallel contact tracks, each of which is angled and arranged in such a way that they partially cross each other. The contact tracks are guided in two feed frames, which are arranged one above the other. This measure reduces the values of the crosstalk attenuation without, however, guaranteeing the values necessary for voice and data transmission over transmission paths with 100 Mbit / s or in the frequency range around 100 MHz.

The invention is therefore based on the object of improving an electrical connector of the generic type in such a way that its electrical parameters are significantly improved and meet the requirements for the transmission of high data rates.

The solution to this problem results from the characterizing features of claim 1. This configuration substantially minimizes the capacitive imbalance between the contact arrangements.

Further advantageous embodiments of the invention result from the subclaims.

Fig. 1

einen aus der EP 0.445.376 A1 bekannten Steckverbinder in Explosionsdarstellung,

Fig. 2

das Ersatzschaltbild für zwei Kontaktpaare des Steckverbinders gemäß Fig.1,

Fig. 3

die schematische Darstellung der Leitungsverbindungen im Steckverbinder gemäß Fig.1,

Fig. 4

eine perspektivische Ansicht des erfindungsgemäßen Steckverbinders in Explosionsdarstellung,

Fig. 5

die schematische Darstellung der Leitungsverbindungen im Steckverbinder gemäß Fig. 4,

Fig. 6

eine perspektivische Ansicht der zweiten Ausführungsform des erfindungsgemäßen Steckverbinders gemäß Fig.4 in Explosionsdarstellung,

Fig. 7

eine perspektivische Ansicht der dritten Ausführungsform des erfindungsgemäßen Steckverbinders gemäß Fig. 4 in Explosionsdarstellung und

Fig. 8

die Unteransicht einer weiteren erfindungsgemäßen Anordnung der Verbindungselemente.

The invention is explained in more detail below on the basis of exemplary embodiments illustrated in the drawings. Show it:

Fig. 1

an exploded connector known from EP 0.445.376 A1,

Fig. 2

the equivalent circuit diagram for two contact pairs of the connector according to Fig.1,

Fig. 3

the schematic representation of the line connections in the connector according to Fig.1,

Fig. 4

2 shows a perspective view of the connector according to the invention in an exploded view,

Fig. 5

the schematic representation of the line connections in the connector according to FIG. 4,

Fig. 6

3 shows an exploded perspective view of the second embodiment of the connector according to the invention according to FIG. 4,

Fig. 7

a perspective view of the third embodiment of the connector according to FIG. 4 in an exploded view and

Fig. 8

the bottom view of a further arrangement of the connecting elements according to the invention.

The connector known from EP 0.445.376 A1 according to FIG. 1 has a housing made of an upper part 10 and a lower part 11 made of injection molding. The upper part 10 has opposite, essentially rectangular side walls 14, 15, which are each provided with a through opening 16 for engaging wedge-shaped projections 43 of the lower part 11. On the top of the upper part 10, close to each side wall 14, 15, two rows of columnar lugs 18 extend, which represent clamping elements, between which slots 20 are formed, which - as will be described further below - have electrically conductive connecting elements 80 integral therewith trained trained, angled, flat foot sections 85. The front end wall 22 of the top 10 is provided with a series of parallel grooves 24 communicating with similar grooves 26 formed in the bottom wall of the top 10. Each of the grooves 26 extends to near the lower part of a slot 20 defined by the columnar lugs 18. The front end wall 22 also has opposite, molded and angled, flange-like side parts 28, 29, each form a channel 30. On the opposite end face, the upper part 10 is provided with integrated hooks 34, which form clamping elements for electrical conductors.

The lower part 11 is provided with a substantially flat end section 40 with opposite side walls 42, the outer surfaces of which are provided with the wedge-shaped projections 43. Inward flanges 44 are provided on the inside of each side wall 42. The front end portion 45 of the lower part 11 has an integrally formed part which defines a cavity 50 for receiving a plug, such as a plug attached to the end of a line coming from a telephone device or a computer terminal. In the vicinity of the first end section 40, upright columns 56 arranged in opposite directions are formed approximately in the middle of the lower part 11. The lower part 11 comprises on the front a flat wall 58 which extends upright at a height of approximately the height of the columns 56. The other end of wall 58 terminates at protruding portions 60 from each of side walls 42. Base 11 may receive a closure cap 70 which is disposed between opposite side walls 42 and held in place by flanges 44. The closure cover 70 can be moved between a position in which it closes the access to the cavity 50 and a position in which the cavity 50 is open. A spring 72 is attached to the cap 70 to bias it toward the closed position.

The set of eight electrical connecting elements 80 extends into the slots 20 formed in the upper part 10 by the columnar extensions 18. Each of these connecting elements 80 is provided with an insulation displacement contact element 81, which is fork-shaped and defines a relatively narrow contact slot 82, which opens into a wide insertion section 83. The arrangement is designed such that when an electrically insulated conductor is inserted into the insertion section 83 and when the latter is pushed into the narrow contact slot 82, the insulation of the conductor is cut automatically, so that contact between the central core of the conductor and the material of the connecting element 80 will be produced. The insulation displacement contact elements 81 are arranged substantially flat and at an angle of approximately 45 ° to a line through the columnar lugs 18, i.e. at 45 ° to the plane of each slot 20. Each connecting element 80 is further provided with a foot section 85 which is formed in one piece with the insulation displacement contact elements 81.

A second set of connecting elements 90 has a row of eight contact tongues 92, which are each welded to a foot section 85. An elongated contact strip 93 extends from each contact tongue 92. The contact strips 93 are designed such that they run parallel to one another. The contact strips 93 open as RJ contacts 1 to 8 in the cavity 50 for the RJ plugs of end devices.

The known connector is as one To view 8-wire / -4-pair connector that has RJ contacts 1 to 8 and that can be shown in the following configuration (Fig. 1 to 3): Wires / contacts Pair configuration 1 and 2 Pair 2 3 and 6 Couple 3 5 and 4 Couple 1 7 and 8 Couple 4

The eight plug contacts at the point 120 in FIG. 3 are the RJ contacts 1 to 8 and establish contact with the contact strips 93 in a plug of the plug connector located in the cavity 50. The contact strips 93 extend parallel to one another up to the connecting elements 80 designed as insulation displacement contacts 81.

• C1 die Kapazität zwischen den RJ-Kontakten 3 und 5,
• C2 die Kapazität zwischen den RJ-Kontakten 3 und 4,
• C3 die Kapazität zwischen den RJ-Kontakten 5 und 6,
• C4 die Kapazität zwischen den RJ-Kontakten 6 und 4,
  R1 die Leitungsimpedanz.

Analysis of this arrangement shows that the contact pairs can be viewed as a bridge circuit. The associated equivalent circuit diagram, for example for pairs 1 and 3, is shown in FIG. Where:

• C1 the capacity between the RJ contacts 3 and 5,
• C2 the capacity between the RJ contacts 3 and 4,
• C3 the capacity between the RJ contacts 5 and 6,
• C4 the capacity between the RJ contacts 6 and 4,
  R1 the line impedance.

If the capacitance C1 between the RJ contacts 3 and 5 (FIG. 3) is defined as 1, then the capacitances C2 and C3 are each of size 2 and the capacitance C4 is also of size 1 (FIG. 2).

Wenn die Brücke jedoch, wie im Beispiel dargestellt, die Kapazitätswerte C1 und C4 von der Größe 1 und die Kapazitätswerte C2 und C3 von der Größe 2 aufweist, dann ist sie deutlich unabgeglichen. Diese Situation besteht sowohl zwischen den Paaren 1 und 3 als auch zwischen den Paaren 2 und 3 sowie 3 und 4. Hauptursache für das Nebensprechen ist das kapazitive Ungleichgewicht zwischen den Paaren.To avoid crosstalk, no current may flow through the resistor R1, ie the bridge according to FIG. 2 must be balanced. This in turn means that the condition is met

$$\frac{\text{C1}}{\text{C2}}\text{=}\frac{\text{C3}}{\text{C4}}$$

However, if the bridge, as shown in the example, has the capacitance values C1 and C4 of size 1 and the capacitance values C2 and C3 of size 2, then it is clearly unbalanced. This situation exists between pairs 1 and 3 as well as between pairs 2 and 3 as well as between 3 and 4. The main cause of the crosstalk is the capacitive imbalance between the pairs.

The crosstalk can be minimized if the RJ contacts of a connector are designed to reduce the capacitive imbalance or to connect elements to the RJ contacts that provide controlled capacitance and thus reduce the imbalance. The RJ contact arrangements can be organized so that not only the internal capacitive imbalance but also the internal capacitive imbalance of each associated suitable connector is compensated for.

The connector according to the invention shown in FIG. 4 corresponds in structure to the housing of the connector according to FIG. 1, which is formed from the upper part 10 and lower part 11 , but are guided in multiple angled ways from the cavity 50 to the connecting elements 80 or to the contact tongues 92. The contact tongues 92 are arranged in one plane. From the contact tongue level, the contact strips 93 in the area of the contact tongues 92 are angled downwards and upwards and also to the left or to the right, in some cases several times and in part crossing one another. For example, the RJ contact 1 via its contact strip 93.1 with the contact tongue 92.2, the RJ contact 2 via its contact strip 93.2 with the contact tongue 92.1, the RJ contact 3 via its contact strip 93.3 with the contact tongue 92.3, the RJ contact 4 Via its contact strip 93.4 with the contact tongue 92.5, the RJ contact 5 via its contact strip 93.5 with the contact tongue 92.4, the RJ contact 6 via its contact strip 93.6 with the contact tongue 92.6, the RJ contact 7 via its contact strip 93.7 with the contact tongue 92.8 and the RJ contact 8 is connected via its contact strip 93.8 to the contact tongue 92.7.

5 shows in a schematic representation that this configuration of the contact strips 93 now means the capacitance C1 between the RJ contacts 3 and 5 and the capacitance C4 between the RJ contacts 6 and 4 is increased because the RJ contacts 6 and 4 are closer together. This means that capacities are compared. This adjustment can also be achieved by reducing the capacitances C2 and C3 by positioning the RJ contact elements 3 and 4 or 5 and 6 further apart. The electrical parameters of the other configuration pairs can also be influenced.

A second embodiment of the present invention is shown in FIG. 6. The housing is not shown. The contact strips 93 are angled differently and then guided parallel to one another.

FIG. 7 shows a third embodiment of the contact strips 93 and the contact tongues 92 according to FIG. 4. A second contact element 95 is electrically connected to these connecting elements 93, 92. The second contact element 95 can be either a flexible printed circuit or a metallic element, the element being insulated with a high dielectric material. This high dielectric material is positioned in certain areas on the contact element 95 to provide controlled capacitance to the other contact positions and to balance the internal capacitive imbalance.

FIG. 8 shows a further embodiment of the connection between the contact tongues 92 and the contact strips 93. In this embodiment the contact strips 93 are arranged partially crossed in the area of the feed to the contact tongues 92. The contact strip 93.1 is guided to the contact tongue 92.2 and crosses the contact strip 93.2, which is guided to the contact tongue 92.1. The contact strip 93.3 is guided to the contact tongue 92.3 without crossing. The contact strip 93.4 is connected to the contact tongue 92.5 and crosses the connection between the contact strip 93.5 and the contact tongue 92.4. The contact strip 93.6 is connected to the contact tongue 92.6. The contact strip 93.7 is guided to the contact tongue 92.8 and is crossed by the connection between the contact strip 93.8 and the contact tongue 92.7. The contact strips 93 and the contact tongues 92 are arranged in the connector area in guide webs 57 of the lower housing part 11. The guide webs 57 have interruptions 59 in the area of intersection of the contact strips 93. The contact strips 93 and the contact tongues 92 are only arranged in two planes at the crossing points, but generally in one plane. The contact strips 93, which are partially crossed and guided in plastic guide webs 57, reduce the mutual capacitive influence.

REFERENCE SIGN LIST

1-8

RJ contact

10th

Injection molded top

11

Injection molded lower part

14

Side wall

15

Side wall

16

Through opening

18th

columnar approach

20th

slot

22

End wall

24th

Groove

26

Groove

28

Side panel

29

Side panel

30th

channel

34

hook

40

End section

42

Side wall

43

head Start

44

flange

45

End section

50

cavity

56

pillar

57

Boardwalk

58

wall

59

Interruption

60

part

70

Sealing cover

72

feather

80

Fastener

81

IDC contact element

82

Contact slot

83

Insertion section

85

Foot section

90

Fastener

92

Tongue

92.1 to 92.8

Tongues

93

Contact strips

93.1 to 93.8

Contact strips

95

Contact element

120

Job

C1-C4

capacity

R1

Line impedance

Claims (4)

Electrical connector for communications and data technology with RJ contacts arranged in the housing and with insulation displacement contacts and contact strips connecting them,
characterized,
that the contact strips (93) between the RJ contacts (1 to 8) and the insulation displacement contacts (81) are partially angled several times and at least in the contact tongue area (92) are sometimes not parallel to one another in one plane. Electrical connector for communications and data technology with RJ contacts arranged in the housing and with insulation displacement contacts and contact strips connecting them,
characterized,
that between the contact strips (93) means for Influencing the capacity are arranged. Electrical connector according to claim 1, characterized in that the contact strips (93) are embedded and guided in guide webs (52). Electrical connector according to claims 1 and 3, characterized in that the contact strips (93) are partially crossed so that the guide strips (52) have interruptions (59) in the area of intersection of the contact strips (93).

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