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Free fall detection device

  • US 7,549,335 B2
  • Filed: 02/17/2006
  • Issued: 06/23/2009
  • Est. Priority Date: 04/22/2005
  • Status: Expired due to Fees
First Claim
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1. A free fall detection device comprising:

  • an acceleration detection unit installed in the device to detect an acceleration of the device in each of three axial directions; and

    a rotation decision unit to detect a fall, accompanied by a rotation of the device, from a waveform of the acceleration detected by the acceleration detection unit that has a substantially sinusoidal shape along one of the three axial directions, with a principal moment value of inertia that is an intermediate value among values corresponding to each of the three axial directions.

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