| 摘要 |
An antenna device is provided with a transmission and reception antenna unit. The transmission and reception antenna unit includes an excitation antenna which is mounted on an antenna mounting section of the housing and a helical antenna which is electrically connected to the excitation antenna and can displace with respect to the excitation antenna. A shaft stands in an internal space of the excitation antenna, the helical antenna is adapted to displace along the shaft. In this manner, before the transmission and reception antenna unit is attached to the housing, it is possible to confirm the operation of the unit independently. Furthermore, it is possible to use a region directly under the excitation antenna as a designated region for the rechargeable battery. As a result, it is possible to improve the capacity of the rechargeable battery. <IMAGE> |
