| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a vehicle sensor capable of enhancing detection precision and also being installed in the ground (ground surface). SOLUTION: A magnetic flux generated from a transmission coil part 5 is received by a reception coil part 12, and also when a vehicle is parked, by making use of change of a magnetic flux amount received by the reception coil part 12, it is detected whether or not the vehicle is parked. At this time, if a case 4 of a transmitter 2 and a case 11 of a receiver 3 are made stainless, their strengths are greater than a plastic-made case, and if the vehicle should collide, there is no fear of damages and further the case is not deteriorated by influences of sunlights. Further, if oscillation frequency given to a transmission coil 8 is set to be about 5 kHz, even if an overcurrent loss occurs in the case 4 of the transmitter 2 and the case 11 of the receiver 3, a decay rate of the received magnetic flux caused by the overcurrent loss can be set to be a specified level (for example, 50%) or less, and so as to exert adverse influenecs on a detection.</p> |
