公开(公告)号：US06229423B1

公开(公告)日：2001-05-08

申请号：US09434459

申请日：1999-11-05

申请人： Ichiro Sasada ,  Eugene Paperno ,  Hiromi Naka

发明人： Ichiro Sasada ,  Eugene Paperno ,  Hiromi Naka

IPC分类号： H01F700

CPC分类号： G01R33/025

摘要： The magnetic shield device including a plurality of concentrically arranged open-ended cylinders having a magnetic shaking applied thereto. A rectangular magnetic ribbon is fixed on the innermost cylinder such that a longitudinal direction of the ribbon is in parallel with or substantially in parallel with a circumferential direction of the cylinder to obtain a large magnetic shielding enhancement on a transverse direction, and a coil is wound around the innermost cylinder for supplying a magnetic shaking current. A rectangular magnetic ribbon is fixed on at least one cylinder except for the innermost one such that a longitudinal direction of the ribbon is in parallel with or substantially in parallel with an axial direction of the cylinder to obtain a large magnetic shielding enhancement on the axial direction, and a coil is wound around the cylinder for supplying a magnetic shaking current. A leakage of the magnetic shaking fields can be minimized and a high magnetic shielding enhancement on both the axial and circumferential directions can be attained. At least one cylinder is made of a magnetic material, and axial length and diameter of cylinders are suitably adjusted to attain a uniformity of a leakage magnetic field within the cylinder can be improved while a sufficiently high shielding factor is remained.

摘要翻译： 该磁屏蔽装置包括多个同心布置的开放式气缸，其具有施加于其上的磁振动。 矩形磁带固定在最内侧圆筒上，使得色带的纵向方向与圆柱体的圆周方向平行或基本上平行，以在横向上获得大的磁屏蔽增强，并且卷绕线圈 围绕最内圆柱体供应磁振动电流。 矩形磁带固定在除了最内侧之外的至少一个圆柱体上，使得带的纵向方向与圆柱体的轴向平行或基本上平行于轴向方向，从而在轴向方向上获得大的磁屏蔽增强 并且线圈缠绕在气缸上以提供磁振动电流。 可以使磁场的泄漏最小化，并且可以实现轴向和圆周方向上的高磁屏蔽增强。 至少一个气缸由磁性材料制成，并且适当地调节气缸的轴向长度和直径，以便在保持足够高的屏蔽系数的情况下可以提高气缸内的泄漏磁场的均匀性。