| 摘要 |
PURPOSE:To detect a geographical spot by a gap sensor attached to a mobile body, by engraving a groove on a reaction plate necessary for a linear motor. CONSTITUTION:A gap between a reaction plate 12 and a vehicle 1 is detected at all times by a gap sensor 11 in accordance with the movement of the vehicle 1. The gap is detected for a longer period of time by the depth (d) of a groove at a spot, whereat the gap sensor 11 passes above the groove 13, engraved on the reaction plate 12. A signal in accordance with the length of the gap in such a manner is impressed on a Schmitt circuit 16 through an amplifying circuit 15, provided in a receiver 5. Accordingly, a spot pulse 14 is outputted only when the vehicle passes the groove 13. According to this method, any apparatus on the ground becomes unnecessary. |
