POSITION DETECTION SYSTEM
First Claim
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.
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Accused Products
Abstract
A position detection system that does not require calibration measurement to be performed in advance and reduces the work required for detecting a position and so on is provided. The provided position detection system includes a device having a magnetic inductance coil; a drive coil that has a position-calculating frequency near a resonant frequency of the magnetic inductance coil and generates an alternating magnetic field which acts on the magnetic inductance coil; a plurality of magnetic-field sensors that is disposed outside the operating range of the device and detects an induced magnetic field generated by the magnetic inductance coil; amplitude-component detection section for detecting amplitude components whose phase is substantially orthogonal to the alternating magnetic field from the outputs of the magnetic sensors acquired by the plurality of magnetic sensors; 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.
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Citations
21 Claims
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1. A position detection system comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A position detection system comprising:
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a device having a magnetic inductance coil; a drive coil configured to generate an alternating magnetic field; a plurality of magnetic-field sensors 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; measurement-reference-value calculating section for determining a measurement reference value at the position-calculating frequency on the basis of outputs from the magnetic-field sensors output when the alternating magnetic field and the induced magnetic field are applied at a second frequency away from 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 a difference between the outputs from the magnetic-field sensors output when the alternating magnetic field and the induced magnetic field are applied at the position-calculating frequency and the measurement reference value. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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Specification