Electrical connectors – With circuit conductors and safety grounding provision – Grounding to connector container or housing
Patent
1996-12-05
1999-08-31
Paumen, Gary
Electrical connectors
With circuit conductors and safety grounding provision
Grounding to connector container or housing
439609, H01R 466
Patent
active
059445394
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an electrical connector, and more particularly but not exclusively to an electrical connector having an earth-potential related cable connecting part and an earth-potential related circuit-board connecting part.
More particularly, the present invention intends to provide an electrical connector for connecting together electrical conductors which carry digitally-related current and voltage information pulses which because of the high frequency used generate electromagnetic fields that cannot readily be mastered. The selected frequency, or bit rate, may lie in the MHz range, or even higher.
The inventive connector is particularly intended for use with earth-related circuit-board magazines, with which external conductors and/or cables are intended to be brought into coaction with circuit-board related circuits, conductors and the like by means of electrical connecting devices.
Magazines of this kind are adapted to handle, within electronic circuits, information-carrying signals whose current and/or voltage pulses may have a frequency or bit rate within the Gb/s range.
Such electronic systems are encumbered with the drawbacks that high frequency electromagnetic signals "leak" out as radio waves, while the circuit becomes sensitive to such electromagnetic disturbance fields and therewith loses the ability to transmit and process the information-carrying signals correctly.
The invention therefore intends, from certain aspects, to provide a system wherein all disturbing signal routes are effectively screened and related to earth potential.
The invention is also intended to overcome EMC-type disturbance fields (Electro Magnetic Compatibility) and also in certain cases EMD-type disturbance fields (Electro Magnetic Discharges).
DESCRIPTION OF THE BACKGROUND ART
With regard to the technical field with which the present invention is concerned, several types of different electrical connectors are known to the art, these electrical connectors and the electrical contact devices associated therewith, for instance male and female contacts, are normally adapted for a chosen specific application.
With regard to features specific to the present invention and also to the specific technical field of the invention and the object of effective electromagnetic screening and earth potential relationship, it can be mentioned that electrical connectors are known to the art which include a cable connecting part and a circuit-board connecting part, and where the metallic casings of these connecting parts function as an electromagnetic screen and are earth-potential related, and also include means for giving the casings of respective connecting part a common potential, such as a common earth potential when said connecting parts mutually coact.
Such effective screening is necessary because modern electronic systems often utilize signals of very high frequencies and bit rates. It is to be expected that still higher frequencies and bit rates will be used in the future.
Practical tests have also shown that from the screening aspect, the weakest points are the necessary connecting points between external conductors and the circuit boards mounted in a circuit-board magazine. The connections are effected with electrical connectors connected between one or more circuit boards and external cables or conductors.
Examples of the earlier standpoint of techniques are found in prior publications EP-A1 0,370,833, 0,430,105, 0,467,400, 0,512,438, 0,561,497, 0,524,426, U.S. Pat. No. 4,420,793 and WOA1 87/07441.
These publications teach the use of hole-mounted screening casings connected with the earthing plane of respective circuit boards.
An electrical connector means of this kind also requires the circuit board to have earth-potential related electrical contact means on the edges thereof, so that electrical and mechanical coaction can be achieved with a circuit board related connecting part of the casing.
SUMMARY OF THE INVENTION
TECHNICAL PROBLEMS
With regard to the known state of the art as d
REFERENCES:
patent: 4420793 (1983-12-01), Strandberg
patent: 4439809 (1984-03-01), Weight et al.
patent: 4889959 (1989-12-01), Taylor et al.
Ernolf Stig Carl-Oskar
Hammar Bjorn Bertil
Henningsson Bo Uno Egon
Lindqvist Lars Henrik
Gilman Alexander
Paumen Gary
Telefonaktiebolaget LM Ericsson
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