Method for producing an electromagnetic shield

A method of making a connection between a printed circuit board and an electrically conductive cap for electromagnetic shielding, wherein arranged between the printed circuit board and the cap is an electrically conductive mass which is processable in the initial condition, preferably being a mass which is capable of flow, and by means of the electrically conductive mass the cap is fixed on the printed circuit board and at the same time electrical contacting is effected between the cap and the printed circuit board.

A method as set forth in one of the preceding claims characterised in that the conductive mass includes a silicone, epoxy, PU, Teflon, acryl, EPDM, EPM or other bonding substances or a mixture thereof and has an electrically conductive filler.

A method as set forth in one of the preceding claims characterised in that the cap for shielding purposes is a metal cap or a metallised cap or a cover comprising non-conducting material, for example plastic material.

A method as set forth in one of the preceding claims characterised in that the electrically conductive mass is applied to the appropriate locations on the printed circuit board so that then the shielding cap is fitted on to the locations at which the electrically conductive mass is applied to the printed circuit board.

A method as set forth in one of the preceding claims characterised in that after the connection between the printed circuit board and the cap has been made with the electrically conductive mass, a durable connection between those components is made, with the mass being solidified and/or cross-linked and/or dried.

A method as set forth in one of the preceding claims characterised in that the temperature in the hardening process is markedly lower than the temperatures which usually occur in the soldering procedure for connecting the cap to the printed circuit board.

Connecting an electrically conductive cap to a printed circuit board by means of a method as set forth in one of the preceding claims.

A printed circuit board on which there is arranged an electrically conductive cap which has the function of a shielding element for components arranged on the printed circuit board, wherein an electrically conductive mass is provided for mechanical positioning of the cap between the printed circuit board and the cap, said electrically conductive mass making an electrically conducting connection between the printed circuit board and the metal cap.

An electrical apparatus including a printed circuit board as set forth in one of the preceding claims.

A method as set forth in one of the preceding claims characterised in that for flexing and electrical contacting between the cap and the printed circuit board, a layer with a component X is applied to the printed circuit board and a layer with a component Y is applied to the underside of a side wall of a cap, wherein the two components are such that they react with each other (chemically, physically) so that the desired mechanical fixing and electrical contacting of the cap on the printed circuit board is guaranteed.

A method as set forth in one of the preceding claims characterised in that arranged between the shielding cap and the substrate to be shielded, for example the printed circuit board, is a shrinkable material which upon shrinkage fixes or pulls together the shielding cap and the substrate beneath the shielding cap (FIG. 2).