Geometrical instruments – Indicator of direction of force traversing natural media – Magnetic field responsive
Reexamination Certificate
2007-10-05
2010-06-29
Smith, R. A. (Department: 2841)
Geometrical instruments
Indicator of direction of force traversing natural media
Magnetic field responsive
C702S092000
Reexamination Certificate
active
07743519
ABSTRACT:
A sensor module maintaining high detection accuracy. Correction data of a detected magnetic field is updated only in a case that a fluctuation band acquired from an output signal of an acceleration sensor is less than a threshold value and a difference between an azimuth angle acquired from an output signal of a terrestrial magnetism sensor and an inclination angle acquired from an output signal of acceleration sensor is less than the threshold value. Therefore, the correction data is updated only in a case that a magnetic field at a position of a mobile object is stably detected, and an accuracy of the correction data can be maintained.
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Fuse Akihiro
Kou Futoyoshi
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
Ricoh & Company, Ltd.
Smith R. A.
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