| 摘要 |
PURPOSE:To extend a distance between a high frequency oscillation type sensor and a detecting body detected by the sensor by forming the detecting body by a thin plate-like non-ferrous metal magnetic body. CONSTITUTION:The high frequency oscillation type sensor 5 provided with a detecting coil is fitted to a self-travelling type unmanned car 3 carrying articles such as tools and works at the lower part of the car. The unmanned car 3 detects a tow pass wire arranged on a floor surface 7 by a pickup coil P to travel by an electromagnetic inducting method. A detecting body A to be sensed by the sensor 5 is embeded and fixed on the floor surface 7. The detecting body A is obtained by adhering an aluminium foil 19 of 15mum or less thickness to the surface of a resin plate 12. Consequently, the distance between the sensor 5 and the detecting body A can be extended up to about 50mm., so that incorrect detection due to iron chips scattered on the floor surface is prevented and precise unmanned travelling can be attained. |
