INFORMATION ACQUIRING DEVICE

摘要

The present invention arranges an electronic component which has a detection and transmitting-and-receiving circuit, conductive body and so forth in an internal space of a case other than a space (E) surrounded by virtual surfaces that make a given angle (?) with respect to a coil axis (x) outwardly from the peripheral position of the opening face of the end portion in the X direction of the coil axis of a coil antenna (450). The angle (?) is greater than five (5) degrees, and preferably 90 degrees. A small electronic component or a small conductive body may be arranged within the aforementioned space (E) unless the magnetic current of the antenna (450) is largely changed.