GEOMAGNETISM SENSING DEVICE - ALPS ELECTRIC CO LTD

Title:

GEOMAGNETISM SENSING DEVICE

Document Type and Number:

WIPO Patent Application WO/2011/037118

Kind Code:

A1

Abstract:

Disclosed is a geomagnetism sensing device that can accurately compute angular velocity and the like at each point in time even while complicated movements are being performed, and that has a three-axis sensor that detects geomagnetism. An x-axis sensor, y-axis sensor, and z-axis sensor that detect a geomagnetic vector are provided, and the direction of the geomagnetic vector is determined in spherical coordinates (Bb) from the detection output of each sensor. A reference axis (z0) is chosen in the spherical coordinates (Bb), an imaginary central point (Of) is determined on the reference axis (z0) in response to two detected coordinate data points (Sa, Sc), a normal line (Vg) to a plane that includes vectors (Va, Vc) that extend from the imaginary central point (Of) to each data point (Sa, Sb) is determined from the cross product of the vectors (Va, Vc), the axis that is parallel to the normal line (Vg) and that passes through the origin (Og) is considered the calculated axis of rotation (Ia), and motion centered around this calculated axis of rotation (Ia) is identified.

Inventors:

YAMADA YUKIMITSU (JP)
HIROBE KISEI (JP)

Application Number:

PCT/JP2010/066345

Publication Date:

March 31, 2011

Filing Date:

September 22, 2010

Export Citation:

Click for automatic bibliography generation Help

Assignee:

ALPS ELECTRIC CO LTD (JP)
YAMADA YUKIMITSU (JP)
HIROBE KISEI (JP)

International Classes:

G01C19/58; G01C17/38; G01C19/00; G01C21/08; G01P3/42; G01R33/02

Domestic Patent References:

WO2007099599A1	2007-09-07
WO2006009247A1	2006-01-26
WO2007099599A1	2007-09-07

Foreign References:

JP2008224642A	2008-09-25
JP2005061969A	2005-03-10
JP2008298700A	2008-12-11
JP2003194574A	2003-07-09
JPH0981308A	1997-03-28
JP2008224642A	2008-09-25

Other References: