Cord switch and detecting apparatus using the same
First Claim
1. A cord switch, comprising:
- a hollowed insulator having restorability,a plurality of wire electrodes arranged along an inner surface of a hollow part of the hollowed insulator in a longitudinal direction such that the wire electrodes do not electrically contact with each other when the hollowed insulator is in a restored state; and
an outer electrode provided around an outer periphery surface of the hollowed insulator, the outer electrode forming an electrostatic capacitance between the outer electrode and one of the wire electrodes and forming a floating electrostatic capacitance between the outer electrode and the earth.
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Accused Products
Abstract
A cord switch 1 has wire electrodes 12A, 12B spirally arranged along an inner surface of a hollow part 10 of a hollowed insulator 11 in a longitudinal direction such that the wire electrodes do not electrically contact with each other, an outer electrode 13 provided around an outer periphery surface of the hollowed insulator 11 and jacketed with an insulating layer 14. An electrostatic capacitance is formed between the outer electrode 13 and a wire electrode for grounding, and a floating electrostatic capacitance is formed between the outer electrode 13 and the earth. The close approach of the human body to the cord switch 1 can be detected in a non-contact manner by measuring the alteration in the electrostatic capacitance.
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Citations
17 Claims
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1. A cord switch, comprising:
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a hollowed insulator having restorability, a plurality of wire electrodes arranged along an inner surface of a hollow part of the hollowed insulator in a longitudinal direction such that the wire electrodes do not electrically contact with each other when the hollowed insulator is in a restored state; and an outer electrode provided around an outer periphery surface of the hollowed insulator, the outer electrode forming an electrostatic capacitance between the outer electrode and one of the wire electrodes and forming a floating electrostatic capacitance between the outer electrode and the earth. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A detecting apparatus, comprising:
- a cord switch comprising;
a hollowed insulator having restorability, a plurality of wire electrodes including a first wire electrode for being provided with a signal and a second wire electrode for grounding, the wire electrodes being arranged along an inner surface of a hollow part of the hollowed insulator in a longitudinal direction such that the wire electrodes do not electrically contact with each other when the hollowed insulator is in a restored state; and an outer electrode provided around an outer periphery surface of the hollowed insulator, the outer electrode forming an electrostatic capacitance between the outer electrode and the second wire electrode and forming a floating electrostatic capacitance between the outer electrode and the earth; a first detecting unit for detecting an alteration in an electric potential or an alteration in a current flow between the first wire electrode and the second wire electrode; and a second detecting unit, connected to the outer electrode, for detecting an alteration in the electrostatic capacitance and an alteration in the floating electrostatic capacitance by measuring the electrostatic capacitance and the floating electrostatic capacitance. - View Dependent Claims (13, 14, 15, 16, 17)
- a cord switch comprising;
Specification