Electricity: electrical systems and devices – Housing or mounting assemblies with diverse electrical... – For electronic systems and devices
Utility Patent
1998-06-18
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
C361S801000, C361S816000, C174S034000, C206S719000
Utility Patent
active
06169665
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention is directed to a shielding arrangement of the type suitable for high-frequency shielding of an electrical circuit.
2. Description of the Prior Art
Shielded housings in different forms are employed for shielding against high-frequency radiation or emission to and from electrical circuits. Such noise emission leads to the upward transgression of various limit values of components and to malfunctions of the device. The interference of the transmission energy in sensitive circuit parts in the case of a mobile radiotelephone device is especially problematical. Further, shielding the emission of harmonics from internal oscillator and amplifier stages at extremely high frequencies of 5 through 10 gigahertz is thereby extremely critical.
In conventional printed circuit board manufacture, a shielding frame is first soldered to or screwed on a circuit board or other supporting structure for a circuit which is to be shielded, and a sheet metal part is then pressed onto this frame in a second step. Attempts are made, in particular, to achieve a good shielding with a claw-type connection of the shield cover to the outside wall surfaces of the shielding frame. Soldering of the complete shielding, screwing the shield well to the printed circuit board or gluing with conductive glue would, for example, be conceivable as further possible solutions. These solutions, however, are very cost-intensive.
In mass-produced products, for example given mobile radiotelephone devices, a uniformly good contact of the shielding frame with the shield cover cannot always be guaranteed due to the tolerance of the shielding as well as of the printed circuit board. Moreover, the correct seating of the shielding is difficult to recognize optically because of the laterally overlapping cover.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a shielding arrangement for an electrical circuit that exhibits good tightness against HF radiation and which can be economically manufactured.
The above object is achieved in accordance with the principles of the present invention in a shielding arrangement for an electrical circuit, such as a printed circuit board, having a shielding frame adapted to surround the printed circuit board, the shielding frame carrying a number of cupola-like pegs projecting therefrom, at least around its circumference, these pegs engaging with catches, disposed in registration with the pegs, in a shield cover which fits over the frame. The spacing between the pegs on the shielding frame is determined by the required HF-tightness.
The shielding frame may have inner walls which extend between circumferential walls, and these inner walls may carry cupola-like pegs thereon as well.
As used herein, the description “cupola-like” means that each peg has a base part and a tapered free end. The base part may, for example, have a polygonal cross section, as viewed from above, and the tapered free end can be in the form of a pyramid having faces equal in number to the number of faces of the polygonal base part. For example, the base part can have four sides, such as configured in a square, and the tapered free end will then be a four-sided pyramid.
An optical check for HF-tightness can be easily implemented given the inventive shielding.
REFERENCES:
patent: 5774344 (1998-06-01), Casebolt
patent: 93 18 909 U (1995-05-01), None
patent: 295 15 383 (1996-01-01), None
Lepping Juergen
Soelter Achim
Gandhi Jayprakash N.
Schiff & Hardin & Waite
Siemens Aktiengesellschaft
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