POSITION DETECTION SYSTEM AND POSITION DETECTION METHOD
First Claim
1. A position detection system comprising:
- a first marker that produces, by means of an external power supply, a first alternating magnetic field having a single set of first position-calculating frequencies that are a predetermined frequency away from each other;
a second marker including a magnetic induction coil having as a resonance frequency a substantially central frequency interposed between the single set of first position-calculating frequencies;
a magnetic-field detection section that is disposed outside a working region of the second marker and that detects a magnetic field at the first position-calculating frequencies;
an extracting section that extracts from the magnetic field detected by the magnetic-field detection section the sum of intensities of a single set of first detection-magnetic-field components having the single set of first position-calculating frequencies; and
a position/orientation analyzing section that calculates at least one of a position and a direction of the first marker based on the extracted sum.
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Accused Products
Abstract
The position or the direction of a first marker which produces an alternating magnetic field by means of an external power supply is detected precisely even if the first marker coexists with a second marker which includes a resonance circuit having a resonance frequency the same as or close to the frequency of the alternating magnetic field. There is provided a position detection system including a first marker that produces a first alternating magnetic field having a single set of first position-calculating frequencies that are a predetermined frequency away from each other; a second marker provided with a magnetic induction coil having as a resonance frequency a substantially central frequency interposed between the single set of first position-calculating frequencies; a magnetic-field detection section that is disposed outside the working region and that detects a magnetic field at the first position-calculating frequencies; an extracting section that extracts from the detected magnetic field the sum of the intensities of a single set of first detection-magnetic-field components having the single set of first position-calculating frequencies; and a position/direction analyzing section that calculates the position or the direction of the first marker based on the extracted sum.
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Citations
18 Claims
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1. A position detection system comprising:
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a first marker that produces, by means of an external power supply, a first alternating magnetic field having a single set of first position-calculating frequencies that are a predetermined frequency away from each other; a second marker including a magnetic induction coil having as a resonance frequency a substantially central frequency interposed between the single set of first position-calculating frequencies; a magnetic-field detection section that is disposed outside a working region of the second marker and that detects a magnetic field at the first position-calculating frequencies; an extracting section that extracts from the magnetic field detected by the magnetic-field detection section the sum of intensities of a single set of first detection-magnetic-field components having the single set of first position-calculating frequencies; and a position/orientation analyzing section that calculates at least one of a position and a direction of the first marker based on the extracted sum. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 17, 18)
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12. A position detection method comprising:
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a magnetic-field generating step of causing a first marker to produce, by means of an external power supply, a first alternating magnetic field having a single set of first position-calculating frequencies that are a predetermined frequency away from each other; an induction magnetic-field generating step of causing a second marker having a magnetic induction coil to produce an induced magnetic field in response to the first alternating magnetic field; a magnetic-field detecting step of detecting a magnetic field at the first position-calculating frequencies; an extracting step of extracting from the detected magnetic field the sum of intensities of a single set of first detection-magnetic-field components having the single set of first position-calculating frequencies; and a position/orientation analyzing step of calculating at least one of a position and a direction of the first marker based on the extracted sum. - View Dependent Claims (13, 14, 15, 16)
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Specification