| 摘要 |
The present invention provides a coil system comprising an eccentrically coiled magnetic substance capable of exciting vertical magnetic field components in its center portion and preventing sensitivity of the coil system deteriorating in its center. In the coil system comprising a magnetic substance 6 and a coil 2, no coil is wound around a center portion of the magnetic substance 6, but a coil is wound around one end portion of the magnetic substance. When the coil system is mounted on a metal surface, it can excites vertical magnetic field components to the metal surface without deteriorating sensitivity in the center of a tag or sensor arranged above the coil system.
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