Electrical connectors – With circuit conductors and safety grounding provision
Patent
1997-06-10
1999-08-10
Bradley, Paula
Electrical connectors
With circuit conductors and safety grounding provision
361818, 174 35R, H01R 466
Patent
active
059349158
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a device for earth-connecting a printed circuit board fitted with a board front, and also earth-connecting the board front to an adjacent board front in a magazine which contains a plurality of printed circuit boards in side-by-side relationship, in a manner to achieve electromagnetic compatibility (EMC-shielding), wherein the board front is comprised of a generally U-shaped profile and is mounted on the printed circuit board with the legs of the profile extending parallel with and extending towards the board.
DESCRIPTION OF THE BACKGROUND ART
It is often necessary to shield electronic components in telecommunications systems against ambient electromagnetic radiation so that the components will not be affected by external disturbance and so that radiation emanating from the electronic components themselves will not have a disturbing influence on other parts of the equipment in which they are included. The need to shield electronic components is particularly manifest in the case of printed circuit boards that are positioned side-by-side in a magazine, as a result of the narrow spacing between adjacent boards. It is also important to earth the boards effectively to their respective fronts and to the magazine. Several different solutions have been proposed to this end. None of these solutions, however, satisfactorily solves the problem of shielding and earthing electronic components in a simple, inexpensive and labor-saving manner.
SUMMARY OF THE INVENTION
The object of the present invention is to eliminate the drawbacks of earlier proposed solutions and to provide a low-cost device which can be quickly fitted readily and which will solve the problem of combining earthing and shielding of printed circuit boards housed in a printed circuit board magazine. This object is achieved with a device having the characteristic features set forth in the following claims.
The inventive device is a particularly simple and effective means for shielding and earthing printed circuit boards, and can be easily produced and fitted and is readily handled.
The invention will now be described in more detail with reference to a preferred embodiment thereof and also with reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of a board spring included in an inventive device;
FIG. 2 is a sectional view of the spring shown in FIG. 1;
FIG. 3 is a perspective view of a shielding spring included in an inventive device;
FIG. 4 is a sectional view of the spring shown in FIG. 3;
FIG. 5 is a perspective front view of a board spring and a shielding spring mounted on a printed circuit board to which a board front has been fitted;
FIG. 6 is a perspective front view of a board front;
FIG. 7 illustrates schematically a plurality of printed circuit boards placed side-by-side in an imagined magazine; and
FIG. 8 is a sectional view illustrating the board spring and the shielding spring and the deformation of said springs upon respective contact with the printed circuit board and the adjacent board front.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
FIGS. 1 and 2 show a board spring 1 included in an inventive device, in perspective and in section respectively. The board spring 1 is intended to be fitted to a printed circuit board 2 so as to earth-connect the board with a generally U-shaped board front 3, as will be described in more detail below with reference to FIGS. 5 and 8. The board spring 1 is comprised of a generally flat plate 11 having downwardly extending legs 12 which function to engage in corresponding openings 21 in the printed circuit board 2 (see FIG. 8) such as to secure the board spring 1. The legs 12 may vary in configuration and do not form any part of the present invention. One side of the board spring 1 is provided with resilient, generally U-shaped tongues 13 which when mounting the board front 3 onto the printed circuit board 2 resiliently abut the board front and therewith earth the same.
The inventive device also inc
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Karl Brand, Standard p.ang. vag for EMC-skyddande sk.ang.p och l.ang.dor, Elektroniktidningen, No. 8, Sep. 1992, pp. 30-31.
Sarel's subrack demonstrates EMC capability, Electronic Engineering, vol. 64, No. 789, Sep. 1992, p. 19.
Henningsson Uno
Ronnberg Mats
Bradley Paula
Ta Tho D.
Telefonaktiebolaget LM Ericsson
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