FREE FALL DETECTION METHOD AND FREE FALL DETECTOR
PROBLEM TO BE SOLVED: To provide a free fall detection method and a free fall detector capable of detecting only the true free falls and prevent malfunctions of a device. SOLUTION: The free fall detecting method includes: a step of detecting an acceleration of the device; a step of integrating a det...
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Main Authors | , |
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Format | Patent |
Language | English |
Published |
16.07.2009
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Subjects | |
Online Access | Get full text |
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Summary: | PROBLEM TO BE SOLVED: To provide a free fall detection method and a free fall detector capable of detecting only the true free falls and prevent malfunctions of a device. SOLUTION: The free fall detecting method includes: a step of detecting an acceleration of the device; a step of integrating a detected acceleration to time; a step of determining whether the detected acceleration is periodic; a step of comparing an integrated value with a first critical value, which becomes the criterion for determination for free fall, to determine whether it is a free fall, when the detected acceleration is aperiodic; and a step of comparing the integrated value with a second critical value, to determine whether it is a free fall, when the detected acceleration is periodic. The second critical value is different from the first critical value. Free-fall malfunctions of the device can be prevented, to reduce unnecessary operations of a hard disk drive, by determining whether the detected acceleration is periodic and detecting only the true free falls. COPYRIGHT: (C)2009,JPO&INPIT |
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Bibliography: | Application Number: JP20090000369 |