| 摘要 |
PURPOSE:To improve reception sensitivity without installing a receiving coil slantingly, by providing a conductive plate near at least the receiving coil arranged together with a transmitting coil with a rail interposed. CONSTITUTION:Transmitting coil 4 and receiving coil 5 are so arranged with rail 1 interposed that their coil axes b and b' will be perpendicular to the surface of rail 1. Below receiving coil 5, conductive plate 7 is arranged at adequate interval (d). As a result, magnetic flux provided by transmitting coil 4 varies in passage, and consequently the effect equivalent to that when coil axis (b) is slanted substantially. In this way, the reception sensitivity can be improved without slanting receiving coil axis (b). Further this effect can be obtained by providing conductive plate 7 under transmitting coil 4. |
