Measuring and testing – Speed – velocity – or acceleration – Response to multiple sensing means or motion conditions
Reexamination Certificate
2006-02-17
2009-06-23
Chapman, John E (Department: 2856)
Measuring and testing
Speed, velocity, or acceleration
Response to multiple sensing means or motion conditions
C360S075000
Reexamination Certificate
active
07549335
ABSTRACT:
A free fall detection device capable of detecting a fall accompanied by rotation is provided. A fall accompanied by rotation is detected based on a waveform of an acceleration signal output from the acceleration detection unit and an angular velocity signal output from the angular velocity detection unit. A gravity center acceleration of the device to be protected is calculated from the acceleration detected by the acceleration detection unit and from the angular velocity detected by the angular velocity detection unit. Even when the device being protected rotates as it falls, the fall of the device can be detected from the detected acceleration or angular velocity. Further, by calculating the gravity center acceleration not affected by the rotation, it is possible to detect a fall of the device with high precision even if the device rotates as it falls.
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Abe Yasunori
Inoue Hideki
Saitoh Masakatsu
Unuma Munetoshi
Chapman John E
Crowell & Moring LLP
Hitachi Metals Ltd.
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