摘要:
A conductive electromagnetic interference (EMI) shielding gasket (10) having a compressible non-conductive core (12) enwrapped with a conductive sheath (14). The sheath (14) is a laminate formed by laminating a conductive metal foil (18) at least 0.2 mils thick to a flexible non-conductive substrate (16), preferably a non porous polyester film.
摘要:
An electrically conductive flexible polyurethane foam comprising a polyurethane and at least one conductive filler dispersed therein in an amount effective to provide EMI/RFI shielding, wherein the polyurethane comprises an isocyanate component to active hydrogen component in a ratio of at most 0.20:1. Preferably, the foam has compression deflection value at 50 % compression of at most about 25 psi, a foam density of at most 0.95 g/cm3 and/or noise shielding effectiveness at a frequency of about 20 to about 1000 MHz of at least about 10 dB.
摘要:
The object of the invention is an elongated EMI gasket (electromagnetic interference), made from an electroconductive material, which is characterised in that the cross-section of said wire (20-23) comprises a shape (24, 25, 27) that protrudes from a specific basic cross-section. The object of the invention is also a device wherein the EMI gasket is installed at a joining point between different parts of the device for preventing electromagnetic interference from penetrating said joining point. The shape (24, 25, 27) that protrudes from the specific basic cross-section presses effectively against the joint surfaces forming a permanent contact between the joint surfaces.
摘要:
An electromagnetic isolation apparatus for an electronic device such as a portable telephone is provided which includes first and second shield cases and elastic members such as rubber cushions. The first and second shield cases are disposed within a casing of the electronic device to surround at least part of both surfaces of a printed circuit board mounted within the electronic device. The elastic members are interposed between an inner wall of the casing of the electronic device and an outer surface of the first shield case and between the inner wall of the casing and an outer surface of the second shield case to produce elastic pressures urging the first and second shield cases into conductive engagement with the printed circuit board.
摘要:
An electromagnetic shielding spring gasket assembly includes a coil spring for blocking the propagation of electromagnetic waves therepast. The coil spring includes a plurality of coils having a major and a minor axis and canted along a center line defined by an intersection of the major and minor axes and may be interconnected in a manner forming a radial garter-type canted-coil spring. A back angle of each coil defines the disposition of a trailing portion of each coil with respect to a line normal to the center line which determines a radial load-deflection characteristic of the canted-coil spring assembly. A front angle of each coil defines the disposition of a leading portion of each coil with respect to the normal line. The plurality of coils are noninvasively supported in an orientation for controlling the blocking of electromagnetic waves, for radial loading of the radial garter-type canted-coil spring and for controlling the resilient characteristics of the radial garter-type canted-coil spring.