Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Parameter related to the reproduction or fidelity of a...
Reexamination Certificate
2007-08-21
2007-08-21
Nguyen, Vincent Q. (Department: 2858)
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Parameter related to the reproduction or fidelity of a...
Reexamination Certificate
active
11447086
ABSTRACT:
As the length of a cylinder of a magnetically shielding apparatus is shorter, the amount of magnetism of a component perpendicular to an axis of the cylinder which enters the opening portion of the cylinder is larger, resulting in a lower magnetic shield effect. A second magnetically shielding apparatus is formed in a cylinder with both ends or one direction close to an object to be measured being opened, and is disposed within a first magnetically shielding apparatus. An axial direction of the cylinder is substantially parallel to the magnetic flux density detection direction. The magnetic sensor, which conducts magnetic signal measurement and is disposed within the cylinder, is in the first magnetically shielding apparatus formed in a cylinder having both open ends, to thereby shield a magnetic flux density component that cannot be shielded by the first magnetically shielding apparatus by the periphery of the magnetic sensor.
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A. Marquez, Esq. Juan Carlos
Fisher Esq. Stanley P.
Hitachi High-Technologies Corporation
Nguyen Vincent Q.
Reed Smith LLP
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