Apparatus for measuring skin moisture content and it's operation method
First Claim
1. An apparatus of measuring skin moisture content, the apparatus comprising:
- an electrode unit comprising a reference (R) electrode, a current (C) electrode, and a measuring (M) electrode;
an operational amplifier comprising an inverting input terminal that is supplied with a first voltage and connects with the R electrode, and an output terminal that connects with the C electrode;
a switch to control a connection between the output terminal and the C electrode; and
a comparison control unit to compare the first voltage and a voltage at the output terminal, and controlling the switch to connect the output terminal and the C electrode when the voltage at the output terminal is less than or equal to a value that is acquired by multiplying the first voltage and a predetermined constant.
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Accused Products
Abstract
An apparatus for measuring skin moisture content, the apparatus including: an electrode unit comprising a reference (R) electrode, a current (C) electrode, and a measuring (M) electrode; an operational amplifier including an inverting input terminal that is supplied to a first voltage and connects with the R electrode, and an output terminal that connects with the C electrode; a switch controlling a connection between the output terminal and the C electrode; and a comparison control unit comparing the first voltage with a voltage at the output terminal, and controlling the switch to connect the output terminal and the C electrode when the voltage at the output terminal is less than or equal to a value that is acquired by multiplying the first voltage and a predetermined constant.
57 Citations
14 Claims
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1. An apparatus of measuring skin moisture content, the apparatus comprising:
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an electrode unit comprising a reference (R) electrode, a current (C) electrode, and a measuring (M) electrode; an operational amplifier comprising an inverting input terminal that is supplied with a first voltage and connects with the R electrode, and an output terminal that connects with the C electrode; a switch to control a connection between the output terminal and the C electrode; and a comparison control unit to compare the first voltage and a voltage at the output terminal, and controlling the switch to connect the output terminal and the C electrode when the voltage at the output terminal is less than or equal to a value that is acquired by multiplying the first voltage and a predetermined constant. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of measuring skin moisture content using a skin moisture content measurement apparatus comprising an R electrode, a C electrode, an M electrode, and an operational amplifier, the method comprising:
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controlling a switch to release a connection between an output terminal of the operational amplifier and the C electrode; supplying a first voltage to an inverting input terminal of the operational amplifier; comparing a value, acquired by multiplying the first voltage and a predetermined constant, with a voltage at the output terminal of the operational amplifier; and controlling the switch to connect the output terminal and the C electrode when the voltage at the output terminal is less than or equal to the value that is acquired by multiplying the first voltage and the predetermined constant. - View Dependent Claims (12, 13, 14)
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Specification