Electricity: electrical systems and devices – Housing or mounting assemblies with diverse electrical... – For electronic systems and devices
Utility Patent
1998-05-26
2001-01-02
Gandhi, Jayprakash N. (Department: 2841)
Electricity: electrical systems and devices
Housing or mounting assemblies with diverse electrical...
For electronic systems and devices
C361S800000, C174S034000, C206S719000
Utility Patent
active
06169666
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to an electromagnetic shielding screen comprising a frame and at least a cover provided for covering the frame, the frame and the cover at least partly being made of an electrically conductive material and forming a sub-assembly provided for being pressed against the support of the circuit to be shielded. Such a shielding screen is provided for being placed against a printed circuit board or against any other similar support of an electronic circuit, for example, in a portable telephony device.
An example of a cooperation between a printed circuit board and an electromagnetic shielding screen is described in European Patent application EP-A-0 594 041. According to the structure indicated in this document and illustrated in
FIG. 1
, the shielding screen is formed by a frame
11
and a cover covering this frame, which together form a sub-assembly provided for being pressed against the printed circuit board
12
(or other support of the circuit to be shielded). This sub-assembly is at least partly made of an electrically conductive material so as to realize a kind of Faraday cage for the protection of the circuit. The making of the shielding in two separate parts permits to have access to the protected circuits as required by opening the cover.
The coupling modes habitually found for fastening the cover to the frame are soldering, in which case the coupling is irreversible, or at least implies sufficiently heavy physical handling (unsoldering/resoldering a cover), or also the use of solutions with plates or edges forming a spring and snapping onto the frame. This type of coupling shown, for example, in
FIG. 2
is this time easily removable, but the attempts made show that shaking or shocks acting on structures made in this manner often lead to the unwanted opening of the cover.
OBJECTS AND SUMMARY OF THE INVENTION
It is an object of the invention to propose a removable shielding screen whose steadiness with respect to shaking or shocks is much better than that obtained with previous constructions.
For this purpose, the invention relates to an electromagnetic shielding screen as defined in the opening paragraph of the description which is furthermore characterized in that the fastening of the cover to the frame is ensured by the fact that the shape of the cover corresponds to that of the frame and in that the two have a surface lying opposite to the other for fastening them to each other by adhesion with a conductive adhesive substance applied to said two surfaces. The attempts made with this type of structure confirm the mechanical reliability of the proposed solution.
This solution is also applicable when the frame of the shielding screen marks off the boundary of various separate compartments. In that case, each of the compartments for which it is desirable to have access to the circuit protected by the shielding is covered by a cover whose shape corresponds to that of the associated compartment, and each compartment and the associated cover have a surface lying opposite to the other and for fastening them to each other by adhesion. The conductive adhesive is advantageously a substance which, after the cover(s) has (have) been removed, remains adhesive and permits of sticking again and coming off again a great number of times. Obviously, the invention relates to either one of these shielding screen structures, but also to any printed circuit board or any other similar support of an electronic circuit which is arranged for the protection of this circuit and has such a structure.
These and other aspects of the invention will be apparent from and elucidated with reference to the embodiments described hereinafter.
REFERENCES:
patent: 4639545 (1987-01-01), Pithouse et al.
patent: 4837664 (1989-06-01), Rodriguez, II et al.
patent: 5028739 (1991-07-01), Keyser et al.
patent: 5256833 (1993-10-01), Schwenk
patent: 5524908 (1996-06-01), Reis
patent: 5550713 (1996-08-01), Pressler et al.
patent: 5604668 (1997-02-01), Wohrstein et al.
patent: 0594041A1 (1994-04-01), None
patent: 07221482 (1995-08-01), None
Gandhi Jayprakash N.
U.S. Philips Corporation
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