KR101792823B1 - Apparatus of skin care - Google Patents

Abstract

The present invention relates to a skin care device for accurately measuring the moisture content of a skin by measuring the skin. The skin care device includes a first resistor part having one end connected to a power source and the other end making contact with the skin, a capacitor part having one end connected to the skin and charged by the charge transferred through the skin, And outputting first information indicating the state of the skin based on the resistance value of the capacitor portion and the charging capacity value of the capacitor portion.

Description

[0001] Apparatus of skin care [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a skin care device, and more particularly, to a skin care device that accurately measures the skin condition according to the moisture content of the skin to skin the skin.

Recently, as the appearance of a person becomes important, the beauty of shaping the appearance has become a concern of many people. Many people have a great interest in cultivating a face that is a standard of beauty even in beauty.

In particular, young people who are sensitive to the trend of the beauty and those who are interested in anti-aging of the skin pay much attention to skin care to make clean and elastic skin, that is, good skin.

Accordingly, various industries are actively developing methods and devices for skin care that can meet these needs. Among other things, devices that stimulate the skin to exercise the muscles of the skin, thereby helping the circulation of the skin, are actively being developed.

For example, a skin massage machine disclosed in Korean Utility Model Publication No. 20-2014-0001054 stimulates the skin to help circulation of the skin. However, such a skin massager can only give a uniform stimulus without considering the types of human skin, i.e., dryness, neutrality, and intellectibility, and thus has a limitation in exerting the best massage effect suitable for each skin type.

Korean Patent Publication No. 20-2014-0001054 (2014.02.18)

SUMMARY OF THE INVENTION It is an object of the present invention to provide a skin beauty device that accurately measures the skin condition and massages the skin with a strength suitable for the skin condition based on the measurement.

The technical objects of the present invention are not limited to the technical matters mentioned above, and other technical subjects which are not mentioned can be clearly understood from the following description.

According to an aspect of the present invention, there is provided a skin care device, comprising: a first resistor unit having one end connected to a power source and the other end contacting a skin; And a water content measurement unit for outputting first information indicating a state of the skin based on a resistance value of the first resistance unit, a resistance value of the skin, and a charging capacity value of the capacitor unit, .

The first information may be information corresponding to a frequency value measured based on a resistance value of the first resistance unit, a resistance value of the skin, and a charging capacity value of the capacitor unit.

Wherein the first information includes at least one of a resistance value of the first resistance portion, a resistance value of the skin, and a charging capacity value of the capacitor portion, And is the corresponding information.

And a controller for adjusting intensity of at least one of ultrasonic waves and ions according to the state of the skin determined based on the first information.

And a massage unit for applying at least one of the ultrasonic waves and the ions to the skin according to the intensity.

Wherein the capacitor portion includes a first capacitor and a second capacitor having the same charge capacity and the first capacitor and the second capacitor are charged with different current paths until the first capacitor and the second capacitor are fully charged, Different times may be required.

Wherein the water content measuring unit includes a first resistor, a second resistor and a third resistor connected in series, the first comparator calculating a voltage applied through the first resistor and the capacitor unit, A second comparator for calculating a voltage applied through the capacitor unit, a flip-flop for calculating a voltage input from the first comparator and the second comparator to output a logic signal, A switch for discharging the capacitor unit when turned on, and an inverter for inverting the logic signal output from the flip-flop.

Wherein the first comparator includes a first non-inverting terminal and a first inverting terminal and receives the capacitor voltage through the first non-inverting terminal and receives a voltage applied to the first resistor through the first inverting terminal And the second comparator includes a second non-inverting terminal and a second inverting terminal, receives the voltage applied to the first resistor and the second resistor through the second non-inverting terminal, And the capacitor voltage is applied through the second inverting terminal.

Wherein the water content measuring unit includes a first NAND gate for NANDing one input enable signal and one signal input from the first capacitor to output the signal to the second capacitor, And a second output unit for outputting second information from a second NAND gate for performing a NAND operation on a signal input through the second capacitor or the skin .

The water content measuring unit includes a third NAND gate for NAND-calculating a signal input from the first capacitor or the first resistor unit and outputting the signal to the second capacitor, a NAND gate for performing a NAND operation on the signal input through the first capacitor and the skin A fourth NAND gate for outputting the first information and a fifth NAND gate for receiving and NANDing the signal output from the fourth NAND gate to output the first information; And a second output unit including a sixth NAND gate for NANDing the first information and outputting second information of a size complementary to the first information.

According to the present invention, the skin condition can be precisely measured according to the moisture content of the skin, and the skin can be massaged with the intensity reflecting the skin condition, thereby achieving the best massage effect.

1 is a block diagram of a skin-beauty apparatus of the present invention.
2 is an analog circuit diagram of the skin-beauty apparatus according to the first embodiment of FIG.
FIG. 3 is a view showing a current path when the capacitor of the skin-beauty apparatus according to the first embodiment of FIG. 2 is charged and discharged.
FIG. 4 is a diagram showing a square wave voltage output corresponding to the skin type in the control unit of FIG. 3. FIG.
5 is a digital circuit diagram of a skin-beauty apparatus according to a second embodiment of the present invention.
FIGS. 6 and 7 are diagrams showing current paths when the capacitor portion of the skin measurement unit of FIG. 4 is charged and discharged. FIG.
FIG. 8 is a graph showing a square wave voltage output from the skin care apparatus according to the charging and discharging of the capacitor unit of FIG. 4. FIG.
9 is a diagram showing a logic circuit diagram and a square-wave voltage to be outputted of the skin-beauty apparatus according to the third embodiment.
10 is a diagram showing a logic circuit diagram and a square-wave voltage to be output of the skin-beauty apparatus according to the fourth embodiment.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them can be made clear with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

1 to 3, the connection relationship between components and constituent elements of the skin-beauty apparatus according to an embodiment of the present invention will be described in detail.

FIG. 1 is a block diagram of the skin beauty apparatus of the present invention, FIG. 2 is an analog circuit diagram of the skin beauty apparatus according to the first embodiment of FIG. 1, and FIG. 3 is a block diagram of the skin beauty apparatus according to the first embodiment of FIG. And a current path when the capacitor is charged and discharged.

First, the skin generally consists of several components such as moisture, oil carbohydrates and natrium. When power is applied to such skin, the current value flowing through the skin varies depending on the amount of water in the skin. Thus, changing the current value in the skin depending on the difference in the amount of moisture in the skin can be expressed as 'skin resistance'. Such skin resistance has various values depending on the amount of water in the skin.

For example, when the skin has a small amount of water, the resistance value of the skin resistance becomes large. When the predetermined power source is applied to the skin, the amount of the current flowing to the skin becomes small. The resistance value of the skin becomes smaller, and when the predetermined power source is applied to the skin, the magnitude of the current flowing to the skin can be increased. That is, the skin S in the present specification means that the resistance includes a resistance that can be changed in accordance with the water distribution.

 The skin care device 1 continuously outputs square wave voltages of different frequencies and duty ratios according to the amount of water contained in the skin S and applies the output signal to the controller 60 , And massage the skin with an intensity suitable for the skin condition.

The skin care device 1 includes a first resistance portion 10 having one end connected to a power source and the other end contacting the skin S, a second resistance portion 10 having one end contacting the skin S, And a water content measurement unit 40 for outputting first information indicative of the skin condition through the first resistance unit 10 and the capacitor unit 30.

Here, a predetermined Vcc voltage may be applied to the water content measurement unit 40. [ The resistance value of the first resistive part 10 included in the water content measurement part 40 is represented by R1 and the resistance value of skin contacted through the skin contact part 20 is represented by R2. The capacitor unit 30 can be charged (t1) to 0.693 (R1 + R2) * C time based on the RC circuit and 0.693 (R2) * C time when the charge capacitance of the capacitor unit 30 is represented by C value And can be discharged (t2). Accordingly, the period T of the output signal of the water content measurement unit 40 is the sum of the charging time t1 and the discharging time t2, that is, T = t1 + t2 = 0.693 (R1 + 2 * R2) * C, and the frequency f is 1.44 / (R1 + 2 * R2) * C as a 1 / T value of the period T. [ The duty ratio of the output signal can be calculated as R1 + R2 / (R1 + 2 * R2).

The water content measurement unit 40 can acquire and output the first information based on the frequency f of the output signal. The first information thus outputted may correspond to the frequency value and the duty ratio value measured based on the charging time and the discharging time in the RC circuit.

The water content measuring unit 40 receives power from the power source unit 60 and the power source unit 60 that supply power and receives the electric signal from the nearest minute measuring unit 40 again to the subminiature measuring unit 40 And further includes additional components such as a feedback controller 50 and the like, so that it can exhibit effective performance. The control unit 50 is driven by a power source supplied from the power source unit 60 and adjusts the size of the power source to supply the power to the skin contact unit 20 and also receives the square wave voltage output from the water flow rate measurement unit 40 The vibration of the massage part (not shown) included in the skin contacting part 20 can be controlled.

The control unit 50 may be a microcontrol unit (MCU), and a DC / DC converter unit capable of outputting power having different main bar and duty ratios using the power supplied from the power unit 60 . The DC / DC converter unit can boost the power supplied from the power source unit 60 to drive the control unit 50, and can supply power suitable for the skin beauty device 1. [ The controller 50 may further include an intensity controller for adjusting the massage intensity of the massage unit. The intensity controller may be a variable resistor for controlling the amount of current supplied to the controller 50.

Accordingly, the massage unit can beat the skin or apply the current through various sizes of force through the size of the power supplied from the control unit 50 to help blood circulation. In addition, the controller 50 can adjust the intensity of at least one of the ultrasonic waves and the ions according to the skin condition determined based on the first information VS1 (see FIG. 3 (b)). The massage unit (not shown) may apply at least one of ultrasonic waves and ions to the skin S according to the adjusted intensity.

Such a skin care device 1 may be composed of various analog circuits and digital circuits.

Hereinafter, with reference to Fig. 2, a skin beauty device 1-1 constituted by an analog circuit of an unstable multivibrator among various analog circuits will be described.

The skin care device 1-1 comprises a first resistive part 10-1, a skin contact part 20 contacting the skin S to massage the skin s, a first resistive part 10-1, A capacitor portion 30 including a first capacitor 31 and a second capacitor 32 having the same charge capacity charged / discharged through the contact portion 20 and a capacitor portion 30 including a base terminal, a collector terminal, and an emitter terminal, Type transistor measuring portion 40-1.

Here, the water content measurement unit 40-1 includes a first output unit 41-1 and a second output unit 42-1. As described above, the first and second capacitors 31 and 32 And the discharge time t2 can be 0.693 * (skin resistance) * the charging capacity of the capacitor. The charging time t1 of the capacitor can be 0.693 * (the first resistance part + the skin resistance) * the charging capacity of the capacitor. Accordingly, the water content measurement unit 30 can acquire the first information and the second information of the square wave voltage whose frequency and duty ratio are changed.

The first resistor portion 10-1 is composed of a resistor 10-1a and a resistor b-1b, and each resistor can be fixed to the same resistance value. The skin resistance 11-1 is connected in parallel with the resistance of the first resistance portion 10-1 and is fixed to the fixed resistance 11a at the same resistance value. The variable resistor 11-1b may be replaced by a variable resistor 11-1b.

The a resistor 10-1a among the first resistor portions 10-1a and 10-1b and the fixed resistors 11-1a is connected to the collector terminal of the first output portion 41-1, 11-1a are connected together with the first capacitor 31 to the base terminal of the first output 41-1.

The b resistor 10-1b is connected to the collector terminal of the second output part 42-1 together with the second capacitor 32 and the skin contact part 20 is connected to the collector of the second output part 42-1 Collector terminal, and the emitter terminals of the first output section 41-1 and the second output section 42-1 may be connected together to the ground.

Thus, the first capacitor 31 is charged through the fixed resistor 11a and the variable resistor 11b, and the second capacitor 32 is charged through the a resistor 10-1a and the b resistor 10-b Can be charged. Here, the charging capacities of the first capacitor 31 and the second capacitor 31 are the same. Therefore, the capacitors 31 and 32, which are charged through the current path of the first resistor unit 10-1 and the skin resistor 11-1, have different times until they are completely charged do.

Accordingly, the first output unit 41-1 and the second output unit 42-1, which receive the current from the first capacitor 31 and the second capacitor 32, And outputs the first information VS1 and the second information VS2 (see Fig. 3 (c)), which are square wave voltages of the square wave.

The first information VS1 and the second information VS2 correspond to the resistance value of the first resistance portion 10-1 and the resistance value 11-1 of the skin S and the resistance value of the first resistance portion 10-1, Which is measured based on the resistance value of the resistor Rs. The first information VS1 and the second information VS2 are set to the skin S (S 1) because the resistance value of the first resistance unit 10-1 and the resistance value of the first resistance unit 10-1 are fixed, ), The frequency and duty ratio can be changed.

That is, the water content measurement unit 40 acquires information that the frequency and the duty ratio are changed through the amount of moisture contained in the skin, without being affected by a change in the external environment such as a change in the supplied voltage, It is possible to output it.

 3, the current path through which the first capacitor 31 and the second capacitor 32 are charged and discharged and the current path from the first output section 41-1 and the second output section 42-1 The first information VS1 and the second information VS2, which are square wave voltages to be outputted, will be described in detail.

Fig. 3 (a) is a view showing a current path of the skin-beauty apparatus of Fig. 2, Fig. 3 (b) is a diagram showing a square wave voltage output from the first output unit, 2 shows the first information (VS1) and the second information (VS2) of the square wave outputted from the output unit.

The first capacitor 31 and the second capacitor 32 of the skin beauty device 1 are different from each other due to different current paths and a slight difference in characteristics between the first output section 41 and the second output section 42, Of the capacitors are charged first, and when the charged capacitors are discharged, the other capacitors are charged and discharged alternately in such a way that they are charged.

The first capacitor 31 is charged ahead of the second capacitor 32 so that a clear description can be made in the present specification so that when the first capacitor 31 is discharged and the second capacitor 32 is charged .

* The first capacitor 31 is charged by the charge introduced through the skin resistance 11-1. At this time, the charging speed of the first capacitor 31 can be changed according to the resistance value of the skin resistance 11-1. For example, when the resistance value of the skin resistance 11-1 becomes small due to a large amount of water contained in the skin, the first capacitor 31 is relatively small in the number of solders and the resistance value of the skin resistance 11-1 It can be charged faster than when it is large.

The first capacitor 31 charged in this manner applies a threshold voltage of the base terminal, that is, a voltage equal to or higher than the set reference voltage, so that the base terminal and the collector terminal of the first output section 41-1 are energized. Thereby, the charged charge of the first capacitor 31 is discharged through the emitter terminal, whereby the first capacitor 31 is discharged.

At this time, the second capacitor 32 whose one end is grounded through the connection between the base terminal and the collector terminal of the first output section 41-1 is charged with the charge flowing through the b resistor 10-1b. The second capacitor 32 applies a potential capable of conducting the second output section 42-1 to the base terminal of the second output section 42-1 so that the second output section 42-1 The collector terminal and the emitter terminal of the second capacitor 32 are energized through which the second capacitor 32 is discharged.

In other words, when the charged first capacitor 31 is discharged, the second capacitor 32 is charged through the first resistor portion 10-1 while the first output portion 41-1 is energized, The charged second capacitor 32 applies a voltage equal to or higher than a reference voltage set to the second output section 42-1 to the base terminal of the second output section 42-1 and the second output section 42-1 ) Is energized, so that a current is discharged and discharged.

Meanwhile, the discharged first capacitor 32 is charged again through the skin resistance 11 while the second output portion 42-1 is energized. That is, the first capacitor 31 and the second capacitor 32 are charged and discharged in a complementary manner with a certain time difference from each other.

Accordingly, the first output unit 41-1 and the second output unit 42-1 can output the first information VS1 and the second information VS2, which are square wave voltages of a complementary magnitude. More specifically, the first information VS1 and the second information VS2 indicate that the first information VS1 indicates that the first capacitor 31 is discharged and when the second capacitor 32 is charged, When the second capacitor 32 is discharged and the first capacitor 31 is charged, the maximum voltage of the first capacitor 31 becomes a square-wave voltage as shown in FIG. 3 (b).

On the other hand, the second information VS2 becomes zero voltage when the second capacitor 32 is discharged and the first capacitor 31 charges, and the second information VS2 becomes the zero voltage when the first capacitor 31 is discharged and the second capacitor 32 is charged , It becomes the maximum voltage of the second capacitor 32 and becomes a square wave voltage as shown in FIG. 3 (c).

In other words, the first information VS1 indicates the maximum voltage of the first capacitor when the second information VS2 indicates the O voltage, and the second information VS2 indicates the maximum voltage of the second capacitor 32 O voltage. That is, the first information VS1 and the second information VS2 become complementary square wave voltages.

Referring to FIG. 4, the frequency and duty ratio of the first information are changed according to the magnitude of the skin resistance 11-1, and the output square wave will be described in more detail.

FIG. 4 shows the case where the value of the skin resistance 11-1 is the smallest relative to other values, the largest value relative to the other values, and the intermediate value which is the value of the largest and smallest values of the resistance value Are shown by way of example.

4A, when the skin resistance of the skin resistor 11-1 is small due to a large moisture content in the skin, the rate at which the first capacitor 31 is charged within one period becomes faster, The discharging speed of the first capacitor 31 is slowed down. On the other hand, the charging speed of the second capacitor 32 is slowed down, and the discharging speed is increased.

Therefore, the second output unit 42-1 outputs the maximum voltage of the second capacitor 32 for a predetermined time, and this maximum voltage is outputted for a relatively longer time than the time of outputting the zero voltage. The square wave voltage having such a duty ratio is changed to a high average voltage through the controller 60 and is transmitted to the massage unit to massage the skin with strong intensity.

4 (b) shows a case where the water resistance of the skin resistance 11-1 is very small and the first capacitor 31 is charged in one period when the resistance value of the skin resistance 11-1 is larger than other cases The speed is slowed down, and the discharge speed of the first capacitor 31 is relatively fast. On the contrary, the charging speed of the second capacitor 32 becomes faster, and the discharging speed becomes slower.

Accordingly, the second output section 42-1 outputs the maximum voltage of the second capacitor 32 for a predetermined time, and the zero voltage is outputted for a relatively longer time than the maximum voltage of the second capacitor 32. [ The square wave voltage having the duty ratio thus outputted is changed to a low average voltage through the control unit 60 and is transmitted to the massage unit to massage the skin with a weak intensity.

4C shows the resistance value of the skin resistance 11-1 in which the resistance value of the skin resistance 11-1 shown in Figs. 4A and 4B is a median value , And the number of the bottles in FIG. 4 (c) may be about halfway between the bottles contained in the skin S in FIGS. 4 (a) and 4 (b). In this case, the rate at which the first capacitor 31 is charged and the rate at which the first capacitor 31 is charged within one period can be made similar, and the rate at which the second capacitor 32 is charged and the rate at which the second capacitor 32 is discharged can be made similar. Therefore, the second output unit 42-1 can output a square wave voltage having a duty ratio similar to the time for outputting the maximum voltage of the second capacitor 32 and the time for outputting the zero voltage. The square wave voltage is transmitted to the massage unit through the control unit 60 to massage the skin with a medium intensity.

Thus, the frequency and the duty ratio of the first information differ only in accordance with the resistance value of the skin S. Accordingly, the skin-care device 1 can accurately calculate the frequency value according to the water content contained in the skin without being affected by the unstable state of the change in the supplied voltage and the voltage fluctuation on the skin surface, S).

Hereinafter, a circuit constituted by the digital circuit according to the second embodiment of the skin-beauty-treating apparatus 1 will be described with reference to Fig.

The skin care device 1-2 includes a first resistor portion 10-2 that receives power and forms a current path, a skin contact portion 20 that allows current to flow through the skin S in contact with the skin S, A capacitor portion 30 connected to the contact portion 20 for charging and discharging the charge introduced through the skin S and a capacitor portion 30 having one end connected to the capacitor portion 30 to charge the capacitor voltage applied from the capacitor portion 30, And a nearest-minute measuring unit 40-2 for outputting a rectangular-wave voltage whose duty ratio is changed through comparison between the set reference voltages.

The nearest minute measuring unit 40-2 includes a first resistor 401a-2, a second resistor 401b-2 and a third resistor 401c-2 connected in series. The first resistor 401a-2, A first resistor 401a-2 and a second resistor 401b-2 for comparing a capacitor voltage applied through the capacitor unit 30 and a capacitor voltage applied to the capacitor unit 30, A second comparator 403-2 for calculating a capacitor voltage applied through the first comparator 402-2 and a comparator 403-2 for calculating a voltage of a capacitor applied through the first comparator 402-2 and a second comparator 403-2, A switch 405-2 for discharging the capacitor unit 30 and a switch 405-2 for discharging the capacitor unit 30 when the flip-flop 404-2 is turned on through the signal output from the flip- And an inverter 406-2 for inverting the digital signal.

These components may be formed of a single module, which may be, for example, an NE555 element that is an unstable multivibrator that oscillates continuously to output a square wave voltage.

First, the NE555 device has a low level (L), which is '0' when the output and input signal are below a certain reference value, and a high level (H), which is '1' when the output is higher than a certain reference value.

Such an NE 555 element includes a to h pins, and each pin has different characteristics. For example, the pin a may be a ground pin to be connected to the ground, the pin b may be a trigger pin for enabling the nearest minute measuring unit 40-2 to operate, and the pin c may be a square wave voltage signal As shown in FIG. The d pin can be a reset pin that is output when a voltage is applied and reset when it is grounded. The e pin can be a control voltage pin that modulates a waveform when a voltage is applied by connecting to an external device. It may be a threshold pin that stops the operation of the nearest minute measuring unit 40-2. In addition, the g pin has at least one resistance, that is, a first resistor portion 10-2, so that current can be applied to the skin from the power source, and the discharge pin 10 discharging the capacitor portion 30 connected to the b pin and the f pin. .

Here, when the signal output through the c pin is at a high level (H), the capacitor unit 30 outputs 0.693 (R1 + R2) * through the first resistor unit 10-2 and the skin resistor 11-2. C time and may be discharged at 0.693 (R2) * C time through the first resistance portion 10-2 and the skin resistance 11-2 when the level is low. The capacitor unit 30 may be a small-sized electrolytic capacitor having a large capacitance or a tantalum capacitor having a small capacitance error so that the charge flowing through the skin can be smoothly charged and the charged charge can be discharged smoothly.

The capacitor 30 can be charged and discharged by the first reference voltage and the second reference voltage set in the nearest minute measuring unit 40-2. For example, the first reference voltage may be 0.3 Vcc to 1/3 Vcc applied to the first resistor 50a at the first inverting terminal so that the first comparator 51 can output a low level (L) And the second reference voltage is set to 0.7Vcc to 1V applied to the first resistor 50a and the second resistor 50b to the second non-inverting terminal so that the second comparator 52 can output the high level (H) / 3 Vcc can be input.

 The first comparator 51 and the second comparator 52 receive the voltage from the capacitor unit 30 through the first reference voltage, the second reference voltage, the first non-inverting terminal, and the second inverting terminal, respectively, And outputs a signal having a high level (H) if the calculated value is outputted as a positive real number, and a signal having a low level (L) if the calculated value is not outputted as a positive real number. Here, the low level L forms a state of zero voltage, and the high level H represents a constant capacitor voltage value.

The logic signal output in this manner is input to the flip-flop 404-2, and the flip-flop 404-2 outputs the signal using the clock and the input signal as commonly known. Here, the clock of the flip-flop 404-2 is always given by the power supply, and outputs a digital signal at a high level (H) or a low level (L) by an input logic signal. For example, the flip-flop 404-2 outputs a high level (H) when the high level (H) is input to the R terminal, a low level (L) is input to the S terminal, (L) is inputted to the S terminal, and the low level (L) can be outputted when the high level (H) is inputted to the S terminal.

Further, the output terminal of the flip-flop 404-2 is connected to the base terminal of the switch 405-2 including the collector terminal, the emitter terminal, and the base terminal so that the switch 405-2 can be turned on and off . In other words, when a signal of high level (H) is outputted from the flip-flop 404-2, the emitter terminal and the collector terminal of the switch 405-2 are short-circuited and the power source current flowing from the collector terminal to the emitter terminal When the low level (L) signal is outputted from the flip-flop 404-2, the emitter terminal and the collector terminal of the switch 405-2 are opened and the emitter terminal The current path between the collector terminal and the collector terminal is not formed.

Thus, the switch 405-2 is turned on, and the current of the power source flows to the ground through the switch 405-2, so that the capacitor unit 30 is discharged or the switch 405-2 is turned off A current of the power source can be charged in the capacitor unit 30. [ Thus, the flip-flop 404-2 outputs a digital signal corresponding to the time when the capacitor unit 30 is charged and discharged, and the output signal is inverted through the inverter 406-2, The high level H is inverted to the low level L and the low level L is inverted to the high level H.

6 to 8, the current flowing through the capacitor unit 30 according to the charging and discharging state of the capacitor unit 30 and the square wave output from the skin beauty apparatus 1-2 according to the charging and discharging of the capacitor unit 30 The voltage is described in detail.

First, the capacitor unit 30 stores the charge flowing through the first resistor unit 10-2 and the skin resistor 11-2. At this time, the first comparator 402-2 charges the first resistor 401a -2 and the second comparator 403-2 receives the second reference voltage through the first resistor 401a-2 and the second resistor 401b-2. The capacitor unit 30 is continuously charged while the first comparator 51 operates to output the high level H and the second comparator 403-2 operates to output the low level L. [ The first comparator 402-2 outputs a high level H and the second comparator 403-2 outputs a low level L. When the potential of the capacitor 30 is higher than the second reference voltage, The flip-flop 404-2 calculates the value input from each comparator and outputs a high level (H).

This causes the switch 405-2 to be in a conductive state so that the charge for charging the capacitor portion 30 flows to the collector terminal and the emitter terminal of the switch 405-2 so that the capacitor portion 30 is not charged And discharges.

On the other hand, the capacitor unit 30 is continuously discharged, and the signal output through the capacitor voltage input to the first comparator 402-2 is converted to the low level L, and the second comparator 403-2 A signal output through the input capacitor voltage is converted into a high level H so that the signal output from the flip-flop 404-2 becomes low level L and the switch 405-2 becomes non-conductive , The capacitor unit 30 can again store the charge introduced through the resistor 10-2 and the skin resistance 11-2.

In other words, the capacitor unit 30 charges when the charged potential becomes lower than the first reference voltage, discharges when the charged potential becomes equal to or higher than the second reference voltage, and continuously performs charging and discharging with a time difference do.

The skin beauty apparatus 1-2 outputs the signal high level H for a predetermined time when the capacitor unit 30 is charged according to the charging and discharging of the capacitor unit 30, A square wave voltage having a signal low level (L) for a certain period of time can be outputted.

This square wave voltage can be changed in frequency and duty ratio as the charge rate of the capacitor portion 30 is changed and the discharge rate is changed through the skin resistance 11 as described above. In other words, the frequency and duty ratio of this square wave voltage can be varied in magnitude with the resistance value of the skin resistance 11, which can be from several k [Omega] to several M [Omega].

Hereinafter, with reference to Figs. 9 and 10, a circuit constituted by digital circuits of other embodiments of the skin care device 1 will be described. Fig. 9 is a detailed circuit diagram of the skin-beauty apparatus according to the third embodiment, and is a diagram showing first information and second information which are square-wave voltages to be outputted. Fig. 10 is a detailed circuit diagram and output And the first information and the second information, which are square-wave voltages.

9 and 10, a voltage lower than a first reference voltage indicates a signal at a low level (L), and a voltage higher than a second reference voltage indicates a signal And is represented by a high level (H). In addition, the voltages at the first reference voltage to the second reference voltage may be randomly output at the low level (L) and the high level (H), but in this specification, this indicates that the low level (L) is output.

The nearest minute measuring unit 40-3 of the skin beauty device 1-3 includes a first output unit 41-3 and a second output unit 42-3. Here, the first output unit 41-3 receives one enable signal, performs NAND operation on one signal input from the first capacitor 31, and outputs a signal calculated by the second capacitor 32 Which is a rectangular wave voltage, through the output terminal of the first NAND gate NA1 and the contact of the first resistor portion 10-3 connected to the first capacitor 31. The first NAND gate NA1 outputs the first NAND gate NA1, And outputs the information VS1. The second output unit 42-3 is connected to the output terminal of the second capacitor 31 and the skin contact unit 20 via the contact point between the output terminal and the skin contact unit 20, The second information VS2 having a size complementary to the first information VS1.

The first output unit 41-3 calculates the digital signal high level H and the enable signal high level H to output the digital signal low level L. [ The second capacitor 32 is charged through the skin resistor 11-3 and the first capacitor 31 is discharged. At this time, the charged second capacitor 32 is continuously discharged by applying an electrical signal to the second NAND gate NA2, and the discharged first capacitor 31 is charged by the power source.

The first capacitor 31 and the second capacitor 32 are repeatedly charged and discharged with a predetermined time difference from each other. The first output unit 41-3 and the second output unit 42 connected to the first capacitor 31 and the second capacitor 32 as shown in Figures 9B and 9C, -3) can output the first information VS1 and the second information VS2, which are square wave voltages of a complementary size. In addition, the frequencies and duty ratios of the first information VS1 and the second information VS2, which are square wave voltages, depend on the magnitude of the resistance value of the skin resistance 11-3 and the rate at which the second capacitor 32 is charged accordingly And can be variously changed.

The nearest minute measuring unit 40-4 of the skin beauty device 1-4 includes a first output unit 41-4 and a second output unit 42-4. Here, the first output unit 41-4 includes a third NAND gate (NAND gate) for NANDing the signal input from the first capacitor 31 or the first resistor unit 10-4 and outputting the signal to the second capacitor 32 A fourth NAND gate NA4 and a fourth NAND gate NA4 for NANDing and outputting a signal inputted through the first capacitor 31 and the skin contact portion 20, And the second output section 42-4 outputs the first information VS1 including the fifth NAND gate NA5 to the sixth NAND gate N2 for NANDing the output signal of the fifth NAND gate NA5 NA6 to output the second information VS2.

Here, the second capacitor 32 is connected to the first capacitor 31 and the skin contact portion 20, and is charged with the electric charge supplied from the first capacitor 31, and accordingly, The first capacitor 31 is discharged in response to the speed at which the second capacitor 32 is charged. In other words, the second capacitor 32 is charged when the first capacitor 31 is discharged and discharged when the first capacitor 31 is charged. Accordingly, the fourth NAND gate NA4 outputs the signal low level L and the high level H with a predetermined time difference, and the signal thus outputted is input to the fifth NAND gate NA5 and NANDed And is output as the first information VS1. The sixth NANA gate NA6 receives the first information VS1 and performs NAND operation to output second information VS2 having a size complementary to the first information VS1.

The frequency and the duty ratio of the first information VS1 and the second information VS2 are changed by varying the magnitude of the resistance value of the skin resistance 11-4 and the rate at which the second capacitor 32 is charged accordingly can be changed.

Accordingly, the skin-care device 1 calculates an accurate frequency according to the skin condition, and the massage intensity is changed using the calculated value, so that the skin can be massaged with the massage intensity considering the skin condition.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

1: Skin beauty device
10: first resistance part 11: skin resistance
20: Skin contact portion 30: Capacitor portion
40: Measuring unit for the nearest minute 50:
60: Power source S: Skin
VS1: second information VS2: first information

Claims (2)

A first resistor part having one end connected to the power source and the other end contacting the skin;
A capacitor unit which is charged / discharged at one end based on a charge transferred through the skin in contact with the skin; And
And a water content measurement unit for outputting first information indicating a state of the skin based on a resistance value of the first resistance unit, a resistance value of the skin, and a charging capacity value of the capacitor unit,
Wherein the water content measuring unit includes a first resistor, a second resistor and a third resistor connected in series, the first comparator calculating a voltage applied through the first resistor and the capacitor unit, A second comparator for calculating a capacitor voltage applied through the capacitor unit, a flip-flop for calculating a voltage input from the first comparator and the second comparator and outputting a digital signal,
A switch that is turned on and off by the digital signal output from the flip-flop and discharges the capacitor when operating in a turn-on state and charges the capacitor when operating in a turn-off state; And
And a reverser for inverting and outputting the digital signal output from the flip-flop. The method according to claim 1,
Wherein the first comparator includes a first non-inverting terminal and a first inverting terminal and receives the capacitor voltage through the first non-inverting terminal and receives a voltage applied to the first resistor through the first inverting terminal And the second comparator includes a second non-inverting terminal and a second inverting terminal, receives the voltage applied to the first resistor and the second resistor through the second non-inverting terminal, And the capacitor voltage is applied through the second inverting terminal to calculate.

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