Electrical connectors – Contact comprising cutter – Insulation cutter
Patent
1995-09-01
2000-09-05
Bradley, P. Austin
Electrical connectors
Contact comprising cutter
Insulation cutter
439941, H01R 911
Patent
active
06113418&
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a connector plug or jack for use in communication networks, including data transmission networks. The traditional copper wires in these networks have been challenged by fibre optics, which provide a very high transmission capacity; that is, the ability of conducting a very high number of bits per second. However, the copper wire system still has pronounced advantages, and it has been possible to develop copper wire cables so as to achieve a noticeable increase of the transmission capacity. A main problem has been the electrical capacitance between the wires in a bundle of wires, but very good results have been achieved by different measures such as a twisting of the wires.
In connection with the invention, it has been recognized that in these systems there is a bottle neck problem associated with the use of the connector elements, in which it is common practice, derived from already established standards, to arrange neat rows of terminals which are connected with corresponding rows of cable connector terminals through parallel conductors inside the connector element. Inevitably, there will be a certain capacitive coupling between these conductors, and this coupling will be stronger, the smaller the distance is between the conductors. It is a pronounced desire that the connector elements should be as small as possible, and this, of course, will accentuate the problem, because the required small dimensions will imply a small mutual distance between the internal leads of the single connector elements, and thus a relatively high capacitance between these leads.
However, while the capacitance between neighbouring conductors is relatively high, it may be undesirably low between non-neighbouring conductors. The standard already set for the dedicated use of the single terminals are not too lucky for the favouring of ideal conditions in the connector elements, and problems occur not only as far as capacitance is concerned, but also with respect to conductor inductance and mutual inductance, the former being associated with the width of the conductors and the latter with the coil effect of the pairs of associated conductors.
SUMMARY OF THE INVENTION
The invention is believed to be a pioneer work in the study of the interactions of these different phenomena, but since the physical result of the invention seems to be structurally new, it is deemed unnecessary to describe the said phenomena in more detail. Of course, the structure of the invention has to be closely linked with the said, already established standards, but such standards may change, and the connector according to the invention may well be adapted to other standards.
In its basic concept, the invention breaks with the traditional picture of the leads inside the connector element extending practically parallel with each other between a row of connector terminals and a row of wire receiving terminals, in that these leads, internally in the connector unit, extend generally in a three-dimensional space, such that different leads are spaced not only laterally, but also perpendicularly to the plane of the lateral spacing.
As far as the capacitance is concerned, it is possible to hereby maintain a desired distance between two leads in the connector, while at the same time it is possible to bring more closely together two non-neighbouring leads increase the capacitance between them.
With respect to the mutual inductance, it will clearly make an important difference whether the coil axis is oriented one way or the other, and while the axis is conventionally located perpendicularly to the basic, common plane of the conductors, it will now be possible to turn the direction of the axis into a more or less inclined cross direction, by arranging for leads belonging to the same loops to be located one above the other, whether or not additionally being staggered in the transverse direction. The mutual inductance can be largely affected and controlled in this manner.
Also the inductance of the single leads c
REFERENCES:
patent: 4744772 (1988-05-01), Reichardt et al.
patent: 4917629 (1990-04-01), Matsuzaki et al.
patent: 5064383 (1991-11-01), Locati et al.
patent: 5326286 (1994-07-01), Bixler et al.
patent: 5586914 (1996-12-01), Foster, Jr. et al.
Bradley P. Austin
Cekan/CDT A/S
Ta Tho D.
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