Animate body detector
First Claim
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1. An animate body detector for determining whether a subject to be checked is an animate body, comprising:
- a measurement electrode contacting said subject;
an oscillation frequency generating section for generating an oscillation frequency in response to the capacitance of said subject when said subject contacts the measurement electrodes;
said oscillation frequency generating section consisting of;
a first Schmidt inverter and a second Schmidt inverter connected in series, a first resistor connected between the input and the output of said second inverter through said electrodes, a second resistor connected between the input and output of said second inverter through said first resistor;
a subject recognition signal generating section for generating a subject recognition signal in response to said oscillation frequency;
a reference signal setting section for setting a reference signal; and
an animate body detection control section for comparing said subject recognition signal and said reference signal to determine whether said subject is said animate body.
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Abstract
The subject oscillation frequency generating section generates a subject oscillation frequency in response to the capacitance of subject when the subject contacts the measurement electrode. The subject recognition signal generating section generates a subject recognition signal corresponding to the subject oscillation frequency. The reference signal setting section previously sets a reference signal used to determine whether the subject is an animate body. The animate body detection control section compares the subject recognition signal and the reference signal to determine whether the subject is an animate body.
75 Citations
15 Claims
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1. An animate body detector for determining whether a subject to be checked is an animate body, comprising:
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a measurement electrode contacting said subject; an oscillation frequency generating section for generating an oscillation frequency in response to the capacitance of said subject when said subject contacts the measurement electrodes; said oscillation frequency generating section consisting of; a first Schmidt inverter and a second Schmidt inverter connected in series, a first resistor connected between the input and the output of said second inverter through said electrodes, a second resistor connected between the input and output of said second inverter through said first resistor; a subject recognition signal generating section for generating a subject recognition signal in response to said oscillation frequency; a reference signal setting section for setting a reference signal; and an animate body detection control section for comparing said subject recognition signal and said reference signal to determine whether said subject is said animate body. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An animate body detector for determining whether a subject to be checked is an animate body, comprising:
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a plurality of sensors contacting said subject; a time series change measuring section for measuring time series changes of information obtained from individual said sensors; and an animate body detection processing section for determining that said subject is said animate body when said time series changes have a predetermined value or greater and said information obtained from individual said sensors are respectively different. - View Dependent Claims (10)
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11. An animate body detector for determining whether a subject to be checked is an animate body, comprising:
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a detection electrode contacting said subject; a subject recognition change rate generating section for generating a subject recognition change rate in response to capacitance change when said subject comes close to said detection electrode; and an animate body detecting section for determining whether said subject is said animate body, based on said subject recognition change rate. - View Dependent Claims (12, 13, 14)
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15. An animate body detector for determining whether a subject which exhibits a capacitance is an animate body, comprising:
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a plurality of measurement electrodes contacting said subject; a basic clock; a pulse oscillation circuit for generating a subject oscillation frequency in response to the capacitance of said subject when said subject contacts the measurement electrodes; an edge detection circuit for carrying out edge detection of said oscillation frequency under control of an edge detection start signal; a counter for counting a basic clock signal upon receiving a rising or falling detection signal from the edge detection circuit; a change rate arithmetic circuit for receiving an input from said counter and calculating a time-based change rate of the input from the counter; and a comparator for comparing said time-based change rate to a reference threshold value recognized as an animate body to determine whether said subject is said animate body.
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Specification