Distance detection system
First Claim
1. A distance detection system configured of an electric-field forming apparatus and an electric-field receiving apparatus, comprising:
- a quasi-electrostatic-field forming unit included in the electric-field forming apparatus, for forming quasi-electrostatic fields for a plurality of frequencies, an intensity of the quasi-electrostatic field for each frequency falling below a predetermined threshold intensity at a different distance from the quasi-electrostatic-field forming unit; and
a distance detection unit included in either one of the electric-field forming apparatus and the electric-field receiving apparatus, for;
storing a frequency/distance conversion table; and
by referring to the frequency/distance conversion table, detecting a distance between the electric-field forming apparatus and the electric-field receiving apparatus, based on which frequencies of the quasi-electrostatic fields are received by the electric-field receiving apparatus.
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Accused Products
Abstract
A distance detection system is disclosed. The distance detection system includes an electric-field forming apparatus and an electric-field receiving apparatus. Quasi-electrostatic-field forming means is included in the electric-field forming apparatus. The quasi-electrostatic-field forming means is for forming quasi-electrostatic fields for a plurality of frequencies. The intensity of the quasi-electrostatic field for each frequency falls below a predetermined threshold intensity at a different distance from the quasi-electrostatic-field forming means. Distance detection means is included in either one of the electric-field forming apparatus and the electric-field receiving apparatus. The distance detection means is for detecting a distance between the electric-field forming apparatus and the electric-field receiving apparatus, based on the frequency of a quasi-electrostatic field received by the electric-field receiving apparatus.
45 Citations
17 Claims
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1. A distance detection system configured of an electric-field forming apparatus and an electric-field receiving apparatus, comprising:
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a quasi-electrostatic-field forming unit included in the electric-field forming apparatus, for forming quasi-electrostatic fields for a plurality of frequencies, an intensity of the quasi-electrostatic field for each frequency falling below a predetermined threshold intensity at a different distance from the quasi-electrostatic-field forming unit; and a distance detection unit included in either one of the electric-field forming apparatus and the electric-field receiving apparatus, for; storing a frequency/distance conversion table; and by referring to the frequency/distance conversion table, detecting a distance between the electric-field forming apparatus and the electric-field receiving apparatus, based on which frequencies of the quasi-electrostatic fields are received by the electric-field receiving apparatus. - View Dependent Claims (2, 3)
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4. An electric-field forming apparatus comprising:
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a quasi-electrostatic-field forming unit for forming quasi-electrostatic fields for a plurality of frequencies, an intensity of the quasi-electrostatic field for each frequency falling below a predetermined threshold intensity at a different distance from the quasi-electrostatic-field forming unit; and a distance detection unit for; storing a frequency/distance conversion table; and by referring to the frequency/distance conversion table, detecting a distance between the electric-field forming apparatus and an electric-field receiving apparatus provided on a moving subject, based on which frequencies of the quasi-electrostatic fields are received by the electric-field receiving apparatus. - View Dependent Claims (5, 6, 7, 8)
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9. An electric-field forming method comprising:
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a quasi-electrostatic-field forming step of forming, with an electric-field forming apparatus, quasi-electrostatic fields for a plurality of frequencies, an intensity of the quasi-electrostatic field for each frequency falling below a predetermined threshold intensity at a different distance from the electric-field forming apparatus; and a distance detection step of, by referring to a frequency/distance conversion table, detecting a distance between the electric-field forming apparatus and an electric-field receiving apparatus provided on a moving subject, based on which frequencies of the quasi-electrostatic fields are received by the electric-field receiving apparatus. - View Dependent Claims (10, 11, 12, 13)
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14. An electric-field receiving apparatus provided on a moving subject, comprising:
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a receiving unit for receiving from an electric-field forming apparatus quasi-electrostatic fields for a plurality of frequencies, an intensity of the quasi-electrostatic field for each frequency falling below a predetermined threshold intensity at a different distance from the electric-field forming apparatus; and a distance detection unit for; storing a frequency/distance conversion table; and by referring to the frequency/distance conversion table, detecting a distance, based on which frequencies of the quasi-electrostatic fields are received by the receiving unit. - View Dependent Claims (15)
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16. An electric-field receiving method for an electric-field receiving apparatus provided on a moving subject, comprising:
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a receiving step of receiving from an electric-field forming apparatus quasi-electrostatic fields for a plurality of frequencies, an intensity of the quasi-electrostatic field for each frequency falling below a predetermined threshold intensity at a different distance from the electric-field forming apparatus; and a distance detection step of, by referring to a frequency/distance conversion table, detecting a distance, based on which frequencies of the quasi-electrostatic fields are received in the receiving step. - View Dependent Claims (17)
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Specification