| 摘要 |
PURPOSE:To clearly indicate a dangerous zone or the like, by charging the electric power generated by solar cells in an electrical double-layer capacitor and supplying the stored power to an emitter on the basis of the detected signal when a roadway is flooded. CONSTITUTION:The electric power generated by solar cells 2 is charged in an electrical double-layer capacitor 4. When a flood on a roadway is detected by water sensors 7, 7, the stored power in the electrical double-layer capacitor 4 is supplied to an emitter 3 on the basis of the detected signal to light the emitter 3 or make it flash. Accordingly, if the signs are arranged appropriately along passage lanes, dangerous zones, etc., these passage lanes and dangerous zones can be clearly indicated in the case of roadway flood at night. |
