Fence sensor
First Claim
1. A fence sensor, comprising:
- a detection electrode;
a reference electrode insulated from the detection electrode;
a chargeable member insulated from both of the detection electrode and the reference electrode, the chargeable member being arranged such that at least a part of the chargeable member is situated within a detection region of the detection electrode, and the chargeable member being formed from a conductor; and
a detection circuit for detecting a change in the electrostatic capacitance between the detection electrode and the reference electrode that is generated by the presence of an object to be detected within the detection region.
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Accused Products
Abstract
It is an object of this invention to provide a fence sensor which can achieve an excellent detection stability without using a current for generating an electric field nor infrared rays. The fence sensor comprises a detection electrode (8); a reference electrode (9) insulated from the detection electrode (8); a chargeable member (4) insulated from both of the detection electrode (8) and the reference electrode (9); and a detection circuit (20) for detecting a change in the electrostatic capacitance between the detection electrode and the reference electrode that is generated by the presence of an object to be detected within a detection region of the detection electrode. In this fence sensor, the chargeable member is arranged such that at least a part of the chargeable member is situated within the detection region of the detection electrode. Further, the chargeable member is formed from a conductor.
33 Citations
19 Claims
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1. A fence sensor, comprising:
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a detection electrode;
a reference electrode insulated from the detection electrode;
a chargeable member insulated from both of the detection electrode and the reference electrode, the chargeable member being arranged such that at least a part of the chargeable member is situated within a detection region of the detection electrode, and the chargeable member being formed from a conductor; and
a detection circuit for detecting a change in the electrostatic capacitance between the detection electrode and the reference electrode that is generated by the presence of an object to be detected within the detection region. - View Dependent Claims (2, 4, 5, 6, 7, 8, 9, 10, 11)
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3. A fence sensor, comprising:
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a detection electrode;
a reference electrode insulated from the detection electrode;
a chargeable member arranged such that at least a part of the chargeable member is situated within a detection region of the detection electrode, the chargeable member being formed from an insulator; and
a detection circuit for detecting a change in the electrostatic capacitance between the detection electrode and the reference electrode that is generated by the presence of an object to be detected within the detection region.
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12. A fence sensor, comprising:
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a detection electrode;
a reference electrode insulated from the detection electrode;
a detection circuit for detecting a change in electrostatic capacitance between the detection electrode and the reference electrode that is generated by the presence of an object to be detected within the detection region; and
a capacitor connected in series between the detection circuit and the detection electrode, the capacitor being disposed separated from the detection electrode. - View Dependent Claims (13)
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14. A fence sensor, comprising:
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a detection electrode;
a reference electrode insulated from the detection electrode;
a detection circuit for detecting a change in electrostatic capacitance between the detection electrode and the reference electrode that is generated by the presence of an object to be detected within the detection region; and
water film separation means for separating a water film on the surface of the detection electrode from a water film grounded to the earth. - View Dependent Claims (15, 16)
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17. A fence sensor, comprising:
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a detection electrode;
a reference electrode insulated from the detection electrode; and
a chargeable member insulated from both of the detection electrode and the reference electrode, the chargeable member being formed from a conductor or an insulator, and the chargeable member being arranged such that at least a part of the chargeable member is situated within a detection region of the detection electrode.
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18. A sensor for an ascending and descending member, comprising:
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a detection electrode;
a reference electrode insulated from the detection electrode;
an ascending and descending member insulated from both of the detection electrode and the reference electrode, the ascending and descending member being formed from a conductor or an insulator, and the ascending and descending member being arranged such that at least a part of the ascending and descending member is situated within a detection region of the detection electrode; and
a detection circuit for detecting a change in electrostatic capacitance between the detection electrode and the reference electrode that is generated by the presence of an object to be detected within the detection region.
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19. A sensor for an ascending and descending member, comprising:
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a detection electrode;
a reference electrode insulated from the detection electrode; and
a chargeable member insulated from both of the detection electrode and the reference electrode, the chargeable member being formed from a conductor or an insulator, and the chargeable member being arranged such that at least a part of the chargeable member is situated within a detection region of the detection electrode.
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Specification