Patent ID: 7335838
Filing Date: 2008-02-26
Classification: H05K

Abstract:
1. A wall element for a magnetically shielded room, said wall element comprising at least one first layer which is formed of metal plate having a high electrical conductivity, at least two layers, a second layer and a third layer, which are formed of metal plate having a high magnetic permeability, wherein said layers are superimposed one on top of another in surface contact with each other without any separating air gaps, so that each first layer having a high electrical conductivity lies between each second and third layers having a high permeability substantially in surface contact with the second and third layers, the layers together forming a compact structure in which the product (σ×μ) of electrical conductivity (σ) and permeability (μ) is maximized so as to minimize the penetration depth of magnetic interference, and a fourth layer, which is formed of a material having a high electric conductivity, said fourth layer being superimposed on top of the second layer to form an outside layer of the wall element.