Patent ID: 8525045

Claim:
A Faraday cage, comprising: a casing structured by: a first housing comprising: a first outer cover made of a conductive material, and a first inner cover made of a conductive material, which is accommodated in the first outer cover and is electrically insulated from the first outer cover, and a second housing comprising: a second outer cover made of a conductive material, which fits the first outer cover, and a second inner cover made of a conductive material, which is accommodated in the second outer cover and is electrically insulated from the second outer cover, wherein the first and second housings are separable from each other; wherein a disposable filter cartridge exchangeably disposed inside the casing accommodates therein a first filter for collecting fine particles sucked in from the outside the casing; wherein the filter cartridge is made of a synthetic resin, and comprises: a first cylindrical part extended in a direction of sucking in fine particles, an increased-diameter part accommodating therein the first filter, whose diameter is larger than that of the first cylindrical part, and a second cylindrical part extended in the suction direction, which is disposed in such a manner that the increased-diameter part is interposed between the second cylindrical part and the first cylindrical part in the suction direction; and wherein the first cylindrical part, the increased-diameter part, and the second cylindrical part are undetachably connected with each other to have an integral structure.