Patent ID: 8253036

Claim:
A joint structure operatively connected between a first wall element and a second wall element of a magnetically shielded room, wherein both wall elements operatively connected in order from inside of the shielded room to the outside of the shielded room, comprising: a first μ metal plate; a first aluminum plate; a second μ metal plate; a second aluminum plate; wherein the joint structure further comprises, operatively connected in order from inside of the shielded room to the outside of the shielded room: a bolt; a first supporting profile; a first presser rubber for balancing a compression force in the joint over an entire joint area; a first μ metal molding for making a magnetic contact between the first μ metal plates; a first perforated aluminum molding; the wall elements, wherein there is a first notch on an edge of the first aluminum plate of the first wall element, and a second notch on an edge of the first aluminum plate of the second wall element, a roughened surface and a first coating on a contact surface of the first aluminum plates, so that the first aluminum plates of the elements match, thereby forming a tongue-and-groove joint, the first aluminum plates being disposed on a same plane; a second perforated aluminum molding; a second μ metal molding for making a magnetic contact between the second μ metal plates; a second presser rubber for balancing the compression force in the joint over the entire joint area; a second supporting profile for strengthening the joint structure and making an electrical contact between the second aluminum plates; and an opposing piece for the bolt,for pressing the joint structure together.