| 摘要 |
<p>Provided is a drop detection device which can reduce a processing load when performing judgment by software, surely judge whether a drop has started, and predict a drop if necessary. It is also possible to provide a magnetic disc device and a mobile electronic device using the drop detection device. Accelerations (ax, ay, az) in orthogonally intersecting three-axis directions are obtained. An evaluation value is obtained according to such an evaluation function that the evaluation value increases as a difference between an acceleration in a stationary mode (ax0, ay0, az0) and an acceleration upon a drop (ax, ay, az) increases for each of the accelerations in the three-axis directions.It is judged that a drop has started according to whether the evaluation value exceeds a predetermined threshold value.</p> |
