Electricity: electrical systems and devices – Housing or mounting assemblies with diverse electrical... – For electronic systems and devices
Patent
1996-11-13
1998-09-08
Picard, Leo P.
Electricity: electrical systems and devices
Housing or mounting assemblies with diverse electrical...
For electronic systems and devices
361753, 361756, 361796, 361800, 361802, 361816, 439377, 174 35R, H05K 714
Patent
active
058054294
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a rail assembly, and then more particularly, but not exclusively, to a rail assembly intended for insertion into an earth potential related or connected magazine.
Earth potential related magazines of the kind intended here are used in telecommunications systems and in telecommunications equipment and are constructed to accommodate a plurality of boards, such as boards which carry printed circuits, referred to as printed circuit boards, circuit boards, ie loaded printed circuit boards, and pattern boards, referred to as printed boards, these different types of boards being referred to in the following as circuit boards.
Earlier rail assemblies that can be used in such earth potential related magazines are adapted to coact over discrete electrical contact points with an earth potential related layer on the circuit board which serves as a surface layer, and also with a magazine earth plane, and also include requisite electrical discrete contacts for the transmission of information-carrying signals.
The mutually parallel rails of such rail assemblies are intended to coact with mutually opposing edge-parts of a circuit board and are each provided with mutually opposing grooves or channels whose widths allow the circuit board to be moved along the grooves to a magazine-inserted position and a magazine-withdrawn position, or vice versa.
The inventive rail assembly is intended to enable an effective connection to be established between the earth potential related layer on a circuit board and the earth plane of the magazine with extremely short transmission paths.
More particularly, the present invention relates to a rail assembly adapted for use in an earth potential related magazine and adapted to connect electrically an electrically conductive contact rail in the rail assembly directly to a magazine earth plane via a row of contact points, so as thereby to provide conditions which enable electromagnetic disturbance fields generated by occurrent information-carrying current pulses and voltage pulses to be screened or shielded through the medium of outer earth potential related layers on the circuit board.
The present invention relates particularly to an application in the field of earth-related circuit board magazines in which external conductors and/or lines are brought into coaction with circuit board related circuits, conductors, lines and the like through the medium of electrical connecting devices.
Magazines of the kind intended here are adapted to within electronic circuits handle information-carrying signals whose current pulses and/or voltage pulses can have a frequency or bit rate within the Gb/s range.
Electronic systems of this kind are encumbered with the drawbacks that high frequency electromagnetic signals leak out as radio waves while, at the same time, the circuits become sensitive to such electromagnetic disturbance fields and therewith lose the ability to transmit the information-carrying signals correctly.
An object of the invention is to provide a system in which all disturbing signal paths are carefully screened and earth potential related.
The inventive arrangement is also intended to overcome problems related to EMC type (Electro Magnetic Compatibility) and also in certain cases disturbance fields of the EMD type (Electro Magnetic Discharges).
DESCRIPTION OF THE PRIOR ART
There are known to the art several different kinds of rail assemblies of the aforedefined kind adapted for earth potential related magazines.
These known rail assemblies are primarily intended to guide the top and bottom edge regions of a circuit board into the magazine correctly, so that electrical discrete contact surfaces on the inwardly facing edge of the circuit board will lie in contact with corresponding electric contact surfaces on an electrical contact strip which is mounted on the magazine, normally on the magazine backplane, and which has provided thereon discrete electrical contact surfaces that are adapted to coact with corresponding electrical contact surfa
REFERENCES:
patent: 3760233 (1973-09-01), Warwick
patent: 5187648 (1993-02-01), Ito
patent: 5467254 (1995-11-01), Brusati et al.
Picard Leo P.
Telefonaktiebolaget LM Ericsson
Vu Phuong T.
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