The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 10, 2006
Filed:
Apr. 20, 2005
Yasuhiro Tamura, Saitama, JP;
Masahito Ito, Saitama, JP;
Yasuhiro Tamura, Saitama, JP;
Masahito Ito, Saitama, JP;
C & N, Inc., Tokyo, JP;
Abstract
A control devicecalibrates a magnetic-field sensorby computation. A computation unitcalculates the magnetic-field intensity based upon the outputs of X-axis, Y-axis, and Z-axis magnetic-field detection devices of the magnetic-field sensor. Such calculation is performed for four or more different points. The calculation is performed such that at least one point is not positioned on a plane including the other points. The computation unitconverts the outputs from the X-axis, Y-axis, and Z-axis magnetic-field detection devices of the magnetic-field sensorinto three-dimensional spatial coordinate points. Then, the computation unitcreates a sphere on which the four or more coordinate points thus obtained are positioned. The coordinate point of the center of the sphere thus created represents the magnetic-field offset. The interfering magnetic-field components in the X-axis, Y-axis, and Z-axis directions thus obtained are subtracted from the outputs of the X-axis, Y-axis, and Z-axis magnetic-field detection devices of the magnetic sensor, whereby calibration is made.