| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an antitheft device for an object installed at a predetermined position in which wrong operation hardly occurs. <P>SOLUTION: The antitheft device includes: a magnetic sensor for detecting geomagnetism in at least one axial direction fixed to an object installed at a predetermined position that is a measurement target; an acceleration sensor for detecting acceleration in the at least one axial direction; a memory for storing detected data; first measurement target installation state determination means for determining whether or not a change in the orientation of the measurement target is equal to or more than a predetermined threshold on the basis of the stored geomagnetism data at two or more different time points; second measurement target installation state determination means for determining whether or not acceleration applied to the measurement target is equal to or higher than a predetermined threshold on the basis of the latest acceleration data or acceleration data at two or more different time points including the latest data stored in the memory; and theft warning means for warning the possibility of theft of the object installed at the predetermined position only when the results of the two determination means both show that an installation state has changed. <P>COPYRIGHT: (C)2013,JPO&INPIT |
