Title:
DROP DETECTION DEVICE, MAGNETIC DISC DEVICE, AND MOBILE ELECTRONIC DEVICE
Document Type and Number:
WIPO Patent Application WO/2010/010781
Kind Code:
A1
Abstract:
Provided are a drop detection device which solves the problem of the characteristic variation of the acceleration sensor thereof to prevent itself from being incapable of drop detection, is free of malfunction, and enables reduction of the size and cost, and a magnetic disc device and a mobile electronic device both of which comprise the drop detection device. Detection values (ax, ay, az) corresponding to the accelerations in orthogonal three-axis (x, y, z) directions are obtained, and judgment values (dxy, dzy) which are differences between the detection value in the y-axis direction used as the reference and the other detection values are obtained. When a judgment standby state where these judgment values remain within a predetermined value range lasts for a predetermined duration or more, a dropping state signal is generated.
Inventors:
SHIBATA AKIHIKO (JP)
Application Number:
PCT/JP2009/061559
Publication Date:
January 28, 2010
Filing Date:
June 25, 2009
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
SHIBATA AKIHIKO (JP)
SHIBATA AKIHIKO (JP)
International Classes:
G11B21/12; G01P15/00
Foreign References:
| JP2007042244A | 2007-02-15 | |||
| JP2005346840A | 2005-12-15 |
Attorney, Agent or Firm:
Kaede Patent Attorneys' Office (JP)
Patent business corporation Kaede Patent Attorneys' Office (JP)
Patent business corporation Kaede Patent Attorneys' Office (JP)
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