| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a drop detection device for preventing drop of an acceleration sensor from not being sensed, suppressing malfunction and achieving compactness and cost reduction by solving problems of characteristic irregularities of the acceleration sensor, and to provide a magnetic disk drive provided with it and a mobile electronic device. <P>SOLUTION: The drop detection device includes: obtaining absolute values of acceleration change amounts in each of three-axes directions; determining whether they satisfy a condition indicating values between first thresholds Ax1_min and second thresholds Ax1_mid higher than the first thresholds; determining whether the absolute values of the acceleration change amounts satisfy a condition reaching third thresholds Ax1_max higher than the second thresholds after satisfying the condition; and regarding them as drop start when the absolute values of the acceleration change amounts are lower than fourth thresholds Ax2 lower than the third thresholds Ax1_max after further satisfying the condition. <P>COPYRIGHT: (C)2010,JPO&INPIT |
