Electricity: electrical systems and devices – Housing or mounting assemblies with diverse electrical... – For electronic systems and devices
Patent
1995-04-27
1997-02-04
Picard, Leo P.
Electricity: electrical systems and devices
Housing or mounting assemblies with diverse electrical...
For electronic systems and devices
361818, 174 35C, 439607, 439947, 439 88, 439 92, H05K 900
Patent
active
056005440
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a shielding device for a plug connector of a backplane printed circuit board of a mounting rack. The shielding device along the side walls of a plug housing has shielding metal sheets which are perpendicular to the backplane printed circuit board and are connected to a shielding layer of the backplane printed circuit board.
A shielding device of this type has been disclosed, for example, by the documents of German Utility Model 92 05 780.2. According to this document, the shielding metal sheets are provided with pin-like projections which can be pressed into holes in the printed circuit board. It is customary to design these holes as plated-through holes connected to the ground layers of the printed circuit board. This produces a close shielding contact between the shielding metal sheet and the ground layers.
The shielding metal sheets have a multiplicity of spring tongues which are upright in the insertion direction and can be connected to a shielding housing of a plug-on mating plug. The spring tongues are formed by being stamped from the shielding metal sheet and bent out towards the side walls of the plug housing. Perforations, which can impair the shielding effect of the shielding metal sheet, are produced in this case in the shielding metal sheet. However, there is also produced between the shielding metal sheet and the outer wall of the plugged-on shielding housing a gap which can reduce the shielding effect still further.
SUMMARY OF THE INVENTION
The invention is based on the object of improving the shielding reliability of the backplane plug connector.
The object is achieved by an improvement in a shielding device for a plug connector of a backplane printed circuit board of a mounting rack, the shielding device along the side walls of a shielding housing of the plug connector has shielding metal sheets which extend perpendicular to the backplane printed circuit board and can be connected to a ground layer of the backplane printed circuit board, said sheets have a multiplicity of spring tongues, which extend in the insertion direction and can make contact with a shielding housing of a plug-on mating plug. The improvements are that the shielding metal sheets have continuously closed areas in the region for making contact with the shielding housing of the mating plug, and that the spring tongues are in each case a component of at least one contact spring strip which bears in a contact-making manner on the inner surface of a side of the shielding metal sheet. The contact spring strip enables the shielding metal sheet to be formed without any perforations. The strip can be provided with a multiplicity of closely adjacent spring tongues which produce a multiplicity of mutually decoupled contacts and close off, in a manner so as to be radiofrequency-proof, the gap between the plugged-on shielding housing of the mating plug and the shielding metal sheet.
The contact spring strip can be configured in respect with the strips form and composition in such a way that the strip has optimum spring and contact properties. The spring metal sheet can therefore be provided with a higher rigidity. The mating plug can then additionally be guided and supported, by the shielding housing, on the shielding metal sheet, and this increases the contact reliability of the plug connection.
The spring tongues are supported at both ends on the shielding metal sheet and the double-ended support of the spring tongues means that a high contact force can be achieved, in conjunction with low material thickness, between the plugged-on shielding housing and the spring tongues. In addition, this doubles the number of contact points between the contact spring strip and the shielding metal sheet.
The contact spring strip, which is formed of a curved continuous web having a plurality of thin transverse slots so that the contact spring strips are connected at each end by a transverse web which bears on the metal sheets, can be simply produced and results in a high stability of the spr
REFERENCES:
patent: 4890199 (1989-12-01), Beutler
patent: 5307242 (1994-04-01), Seibold et al.
patent: 5479321 (1995-12-01), Mair et al.
patent: 5500788 (1996-03-01), Longueville et al.
patent: 5511992 (1996-04-01), Thalhammer
Dinkins Anthony
Picard Leo P.
Siemens Aktiengesellschaft
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