Patent ID: 8164334
Filing Date: 2012-04-24
Classification: A61B

Abstract:
1. A position detection system comprising: a device having a magnetic inductance coil; a drive coil configured to generate an alternating magnetic field; a plurality of magnetic-field sensors disposed outside an operating range of the device and configured to detect an induced magnetic field generated by the magnetic inductance coil, which receives the alternating magnetic field; a frequency determining section configured to determine a position-calculating frequency on the basis of a resonant frequency of the magnetic inductance coil; amplitude-component detection section for detecting at least one of amplitude components substantially orthogonal to the alternating magnetic field and amplitude components having substantially the same phase as the alternating magnetic field from outputs of the plurality of magnetic-field sensors at the position-calculating frequency; and position analyzing section for calculating at least one of a position and an orientation of the device on the basis of the amplitude components.