TW201945711A - Skin moisture amount measurement method, moisturizing effect evaluation method, skin moisture amount measurement device, moisturizing effect evaluation device, and measurement device - Google Patents

Abstract

The objective of the invention is to precisely evaluate the amount of moisture in the skin or the moisturizing effect of cosmetics. According to one embodiment of the present invention, the skin moisture amount measurement method includes: detecting voltage changes in a plurality of detection electrodes 131 to 139, each having an electret resin 14 and an electric conductive body, while causing a detection unit 10a, comprising the plurality of detection electrodes 131 to 139 arranged in an array form, to approach or pull back from skin 16 without establishing contact therewith (steps S61 to 69); and discerning the amount of moisture in the skin 16 on the basis of the voltage changes (step S70).

Description

Skin moisture content measuring method, moisturizing effect evaluation method, skin moisture measuring device, moisturizing effect evaluating device and measuring device

The invention relates to a skin moisture content measuring method, a moisturizing effect evaluation method, a skin moisture content measuring device, a moisturizing effect evaluating device, and a measuring device.

Conventionally, Patent Document 1 discloses a capacitor-type wetness identification device having two electrodes provided opposite to each other. This wetness identification device makes one of the electrodes arranged oppositely contact the measurement sample, and then judges the wetness based on the voltage change between the two electrodes when leaving.
[Prior technical literature]
[Patent Literature]

[Patent Document 1] Patent No. 4830111

[Problems to be solved by the invention]

In the wetness identification device disclosed in Patent Document 1, in order to cause peeling and charging, the wetness identification device must be brought into contact with a measurement sample. However, due to the contact pressure and the like of the measurement sample, the charge amount is not fixed, and it may be difficult to perform accurate measurement.

The present invention has been made in view of such problems, and an object thereof is to provide a skin moisture content measurement method, a moisturizing effect evaluation method, and skin water that can accurately evaluate the moisture content of the skin (skin) and the moisturizing effect of cosmetics A weight measurement device, a moisturizing effect evaluation device, and a measurement device.
[Technical means to solve the problem]

In order to achieve such an object, the first aspect of the present invention is a method for measuring skin moisture content, which includes the following steps: one side of the detection portion having an electret resin and a plurality of electrode portions arranged in an array on the skin Approaching or leaving without contact, detecting the change in voltage of the plurality of electrode portions while determining the amount of water in the skin based on the change in voltage.

The second aspect of the present invention is a method for evaluating a moisturizing effect, which includes the following steps: applying a cosmetic material to the skin; and a detection unit in which a plurality of electrode portions having an electret resin and a conductor are arranged in an array while facing the above. Approaching or leaving the skin without contact, detecting the voltage change of the plurality of electrode portions while detecting the voltage change of the skin to which the cosmetic is applied and the voltage change of the skin to which the cosmetic is not applied Comparison was made to evaluate the moisturizing effect of the above cosmetic.

A third aspect of the present invention is a skin moisture content measuring device, which includes a detection section in which a plurality of electrode sections including an electret resin and a conductor are arranged in an array; and a discrimination section, wherein the detection section is provided on one side When the skin approaches or leaves without contact, the voltage changes of the plurality of electrode portions are detected, and the moisture content of the skin is determined based on the voltage changes.

A fourth aspect of the present invention is an apparatus for evaluating a moisturizing effect, comprising: a detection section in which a plurality of electrode sections including an electret resin and a conductor are arranged in an array; and a discrimination section for enabling the detection section The voltage change of the plurality of electrode portions is approached or moved away without contacting the skin, and the voltage change of the skin to which the cosmetic is applied and the voltage change of the skin to which the cosmetic is not applied are performed. Compare and evaluate the moisturizing effect of the above cosmetic.

A fifth aspect of the present invention is a measuring device comprising: a detection section that arranges a plurality of electrode sections having an electret resin and a conductor in an array; and repeats the detection section a plurality of times to approach the skin without contacting the skin. And a mechanism for leaving; a mechanism for detecting the voltage of each of the plurality of electrode portions after a specific time has elapsed since the above approach and departure; and a change in voltage at the specific time for each of the plurality of electrodes based on the voltage Institution.
[Effect of the invention]

According to the present invention, the moisture content of the skin and the moisturizing effect of the cosmetic can be accurately evaluated.

Hereinafter, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to the embodiments. Furthermore, in the drawings described below, there may be cases where those having the same function are labeled with the same symbol, and repeated descriptions are omitted.

(First Embodiment)
In this embodiment, a detection section provided with an electrode including an electret resin and a conductor is approached or separated without touching the skin, and the moisture content of the skin is determined based on a voltage change of the detection section. Here, the amount of water in the skin may be the sum of the amount of water contained in the skin and the amount of water present on the skin surface.

FIG. 1 is a schematic diagram showing the configuration of the detection section in this embodiment. As shown in FIG. 1, the detection unit 10 includes a ground electrode 11, an insulator 12 provided as a substrate on the ground electrode 11, a detection electrode 13 provided on the insulator 12, and an electret resin 14 provided on the detection electrode 13. An insulator may be provided between the detection electrode 13 and the electret resin 14.

The electret electrode 14 is a person charged by applying a high voltage corona discharge to a fluororesin. In this embodiment, an electret resin is used as a method for non-contactly charging the skin of a measurement target. As long as such an effect can be achieved, the material of the electret resin and its manufacturing method are not limited.

The ground electrode 11 is applied with a reference potential, and can be electrically connected to, for example, a metal frame of a measurement device. The detection electrode 13 is connected to the processing device 15 via an attenuation circuit, a buffer amplifier, and an A / D (Analog / Digital) converter (not shown in FIG. 1). The processing device 15 includes a CPU (Central Processing Unit), a memory, and the like, and obtains a time-dependent voltage change by measuring the voltage of the detection electrode 13 at each specific time, and judges the skin 16 based on the voltage change. The amount of water.

In this embodiment, for example, the detection unit 10 is brought close to the second distance shorter than the first distance from the skin 16, and the moisture content of the skin is determined based on the voltage change of the approaching detection electrode 13. Alternatively, the detection unit 10 may be separated from the skin at a second distance from the skin 16 to detect a change in the voltage of the detection electrode 13 during the departure, and determine the moisture content of the skin based on the voltage change. An example of such a discrimination method will be described later.

FIG. 2A to FIG. 2C and FIG. 3A to FIG. 3C are diagrams for explaining changes in voltage when the detection unit 10 is brought closer to or away from the measurement target 20.

FIG. 2A shows a configuration in which the detection unit 10 is approached or separated vertically with respect to the measurement target 20. When the detection section 10 approaches or moves away from the measurement target 20 in the vertical direction, the distance between the detection section 10 and the measurement target 20 changes, and the voltage of the detection section 10 also changes. FIG. 2B and FIG. 2C are diagrams showing voltage changes in the detection section, and voltage changes in a case where the detection section 10 is approached or separated from the measurement target 20 within a range of 10 mm. In addition, FIG. 2B shows a voltage change of the detection section 10 without the electret resin 14, and FIG. 2C shows a voltage change of the detection section 10 without the electret resin 14. Here, the electret resin 14 is charged with a voltage of -1100 V, and each voltage of 300 V, 200 V, 100 V, and 0 V is applied to the measurement target 20.

In addition, FIG. 3A shows a configuration in which the detection unit 10 is approached or separated from the measurement target 20 in parallel. 3B and 3C are graphs showing changes in the voltage of the detection section, and also show changes in voltage when the detection section 10 is approached or separated from the measurement target 20 within a range of 20 mm. 3B shows the voltage change of the detection section 10 without the electret resin 14, and FIG. 3C shows the voltage change of the detection section 10 without the electret resin 14. Here, the electret resin 14 is charged with a voltage of -1100 V, and each voltage of 1000 V, 800 V, 600 V, 400 V, 200 V, and 0 V is applied to the measurement target 20.

In FIG. 2B, the graph 22 shows the voltage change when the applied voltage to the measurement object 20 is 300 V, and the graph 23 shows the voltage change when the applied voltage to the measurement object 20 is 0 V. In addition, the three graphs located between the graph 22 and the graph 23 sequentially show the voltage change when the applied voltage is 200 V, 100 V, or 50 V from the top. In FIG. 2C, the graph 24 shows the voltage change when the applied voltage to the measurement object 20 is 300 V, and the graph 25 shows the voltage change when the applied voltage to the measurement object 20 is 0 V. The three graphs located between the graph 24 and the graph 25 sequentially show the voltage change when the applied voltage is 200 V, 100 V, or 50 V.

In FIG. 3B, the graph 30 shows the voltage change when the applied voltage to the measurement object 20 is 1000 V, and the graph 31 shows the voltage change when the applied voltage to the measurement object 20 is 0 V. The four graphs located between the graph 30 and the graph 31 sequentially show the voltage changes when the applied voltage is 800 V, 600 V, 400 V, and 200 V. In FIG. 3C, the graph 32 shows the voltage change when the applied voltage to the measurement object 20 is 1000 V, and the graph 33 shows the voltage change when the applied voltage to the measurement object 20 is 0 V. The four graphs located between the graph 32 and the graph 33 are graphs showing the voltage changes when the applied voltage is 800 V, 600 V, 400 V, and 200 V in order from top to bottom.

The graphs 22 and 24 in FIGS. 2B and 2C have two peak voltages that appear with the passage of time, and the peak voltage on the left shows the voltage when the detection unit 10 approaches the inspection object, and the peak voltage on the right shows the detection unit 10 The voltage when the measurement object 20 leaves. Similarly, in FIGS. 3B and 3C, among the peak voltages of the graphs 30 and 32, the voltages when the first and third peak voltages from the left are close to each other, and the second and fourth peak voltages from the left Displays the voltage when leaving.

As can be seen from FIGS. 2B, 2C, 3B, and 3C, when the measurement object 20 is charged, the detected voltage changes by approaching or leaving the detection unit 10. However, when the measurement object 20 is not charged, the detected voltage does not change even if the detection section 10 without the electret resin 14 is approached or separated (Figures 23 and 31).

On the other hand, when the detection unit 10 having the electret resin 14 is used, a voltage change may occur in the uncharged measurement object 20 as the detection unit 10 approaches or leaves (Figures 25 and 33). That is, according to this embodiment, by using the electret resin 14, the measurement object 20 can be charged in a non-contact manner. Therefore, by changing the distance between the measurement object 20 and the detection unit 10, a change in the voltage of the detection unit 10 can be detected, and the amount of water contained in the measurement object 20 can be estimated based on the change in voltage. In addition, in this embodiment, it is not necessary to contact an electrode with the measurement target 20 in order to charge the measurement target 20, so that deviations in the amount of charge caused by the contact pressure between the detection unit 10 and the measurement target 20 can be avoided, and it can be accurately judged Amount of water. Further, as shown in FIGS. 2A and 3A, as long as the distance between the detection section 10 and the measurement target 20 can be changed, the detection section 10 can be moved in an arbitrary direction with respect to the measurement target 20.

FIG. 4 is a schematic diagram showing a skin moisture measuring device according to this embodiment. As shown in FIG. 4, the skin moisture measuring device 40 includes a detection section 10 a, a processing device 15, a fixing section 41, a support section 42, a driving device 43, an attenuation circuit 44, a buffer amplifier 45, and A, in which a plurality of detection electrodes are arrayed. / D converter 46. The detection portion 10 a is fixed to the fixing portion 41. The driving device 43 is configured to move the fixed portion 41 in the arrow direction P. That is, the detection unit 10a can be moved in the arrow direction P by the driving of the driving device 43. The driving device 43 is connected to the support portion 42, and during the measurement, the contact portion 42 a of the support portion 42 is brought into contact with the skin 16 of the measurement target. Preferably, the contact portion 42a is brought into contact with the skin 16, and the detection portion 10a is fixed to the human body by a band or the like. When the distance between the lower surface of the detection portion 10a and the lower surface of the contact portion 42a at the initial position of the detection portion 10a is set to d1, if the detection portion 10a is positioned at the initial position during measurement, the detection portion may be set. A fixed distance d1 is set between 10a and the skin 16. In this embodiment, during the measurement, the detection unit 10a is moved from the distance d1 as the first distance to the distance d2 as the second distance (closed state), the moving direction is reversed, and it is moved again (away state). In this embodiment, a position detection unit such as a rotary encoder or a linear encoder may be used in the driving device 43 to locate the initial position of the detection unit 10a, the distance d2, or other distances (for example, the distance d3 described later). . The driving device 43 may send the position of the detection section 10a (position information of the detection section 10a) obtained by the rotary encoder to the processing device 15 at any time. In addition, the positioning may be performed by a time-of-flight method by installing a distance-measuring sensor in the detection unit 10a, or by other methods.

Further, at least one of the constituent elements such as the attenuation circuit 44, the buffer amplifier 45, the A / D converter 46, and the processing device 15 on the rear side of the detection section 10 a may be integrated with the driving device 43. The processing device 15, the input operation unit 155, and the display unit 156 may be used as a mobile terminal such as a smartphone. In this case, for example, a configuration in which a signal output from the A / D converter 46 is wirelessly transmitted to the mobile terminal may be provided.

In this embodiment, although the detection unit 10a is moved in a straight line (arrow direction P) with respect to the skin 16, it is not necessary to perform this movement, and it may be rotated in the vertical direction with respect to the inside of the electret resin 14 .

The detection portion 10a includes a ground electrode 11; an insulator 12 provided on the ground electrode 11; a detection electrode portion 13a provided on the insulator 12; and an electret resin 14 provided on the detection electrode portion 13a. In this embodiment, the detection electrode portion 13a is configured by nine detection electrodes 131 to 139 in a two-dimensional array.

FIG. 5 is a diagram showing the details of the detection electrode portion 13a of this embodiment. The detection electrode portion 13 a includes detection electrodes 131 to 139 and a multiplexer 50. In addition, instead of providing the multiplexer 50, an A / D converter may be provided after each of the detection electrodes 131 to 139. In FIG. 5, the detection electrodes 131 to 139 are two-dimensionally arranged in a 3 × 3 matrix. The detection electrodes 131 to 139 are respectively connected to the multiplexer 50, and the detection results in the detection electrodes 131 to 139 are sequentially transmitted to the processing device 15 through the multiplexer 50. Furthermore, in this embodiment, the number of detection electrodes arranged in an array is not limited to nine, but may be two or more. In addition, the arrangement of the array is also not particularly limited. It can be a one-dimensional arrangement of detection electrodes arranged in one direction (straight or curved), and can be a matrix of m × n (m and n are natural numbers). The dimensional arrangement may be arranged in the shape of a specific symbol such as a circle, a triangle, or a cross.

In FIG. 4, the detection electrode portion 13 a is connected to the attenuation circuit 44, and the attenuation circuit 44 is connected to the buffer amplifier 45. The attenuation circuit 44 includes a coupling capacitor, and changes the detection voltage based on the ground voltage. The buffer amplifier 45 is connected to the A / D converter 46, and the A / D converter 46 is connected to the processing device 15. Therefore, the voltage detected by each of the detection electrodes 131 to 139 is input to the processing device 15 via the attenuation circuit 44, the buffer amplifier 45, and the A / D converter 46. The processing device 15 includes a CPU 151 that performs various operations such as calculation, control, and discrimination, and a ROM (Read Only Memory) 152 that stores various control programs (computer programs shown in FIG. 6 etc.) executed by the CPU 151 ), Etc .; RAM (Random Access Memory) 153, which temporarily stores data and input data during processing operations of the CPU 151; and flash memory, Static Random Access Memory (SRAM) ) And other non-volatile memory 154 and the like. In addition, an input operation section 155 including a keyboard or various switches for inputting specific instructions or data, a display section 156 for performing various displays, and a driving device 43 are connected to the processing device via a specific driving circuit (not shown). 15.

FIG. 6 is a flowchart showing a processing procedure for estimating the amount of skin moisture in this embodiment. The processing sequence is processing executed by the CPU 151 included in the processing device 15. Therefore, the processing is controlled by the CPU 151 reading the program stored in the ROM 152 and performing the processing shown in FIG. 6 and executing the program.

Prior to the measurement of the skin moisture content in this embodiment, the driving device 43 separates the detection unit 10a from the skin 16 so that the electret resin 14 faces the skin 16 of the measurement target. At this time, the driving device 43 moves the detection section 10 a to an initial position at a distance d1 from the skin 16. FIG. 7 is a diagram showing the position of the detection section 10a when approaching and the position of the detection section 10a when leaving. In the present embodiment, the detection section 10 a starts the measurement from the position at the first distance from the skin 16, that is, the distance d1. During the measurement, the drive device 43 approached the detection unit 10 a to a position at a second distance from the skin 16, that is, a distance d 2, and then moved away to a position at a third distance from the skin 16, that is, a distance d 3. In addition, the distance from the farthest point is not limited to the distance d3, and may be a distance d1, or a distance greater than the distance d2 and less than the distance d1.

In the present embodiment, the driving device 43 is configured to repeat the approach and separation of the detection unit 10 a to the skin N times (N is a natural number). In addition, the drive device 43 may end the approach and departure after a certain period of time has elapsed from the start of the measurement, regardless of the number of approaches and departures.

The driving device 43 distances the detection unit 10a from the skin 16 by a distance d1, and the CPU 151 starts measuring the amount of skin moisture. In step S61, the CPU 151 controls the driving device 43 to start the detection section 10a to approach the skin 16. In this embodiment, the driving device 43 moves the detection section 10a at a specific speed. In step S62, the CPU 151 obtains the voltage of the detection section 10a approaching the skin 16, that is, the voltage of each of the detection electrodes 131 to 139. The CPU 151 stores the voltage values (detection voltages) sequentially sent from the detection section 10a in the RAM 153 in the order input to each detection electrode. Therefore, the voltages stored in the RAM 153 with respect to the respective detection electrodes are held in the input order (in accordance with the elapsed time). In step S63, the CPU 151 determines whether the distance between the detection section 10a and the skin 16 becomes d2 based on the position information of the detection section 10a input from the driving device 43, that is, whether the detection section 10a is closest to the skin 16. If it is determined that the distance is d2, the CPU 151 advances the process to step S64. On the other hand, if it is determined that the distance is not the distance d2, the CPU 151 repeats the processing of steps S62 and S63, and obtains the voltage of each of the detection electrodes 131 to 139 until the detection unit 10a reaches the distance d2.

In step S64, the CPU 151 controls the driving device 43 to start the departure of the detection unit 10a with a distance d2 from the skin 16 from the skin 16. When leaving, the driving device 43 also moves the detection section 10a at a specific speed. In step S65, the CPU 151 obtains the voltage of the detection section 10a with respect to the skin 16 leaving, that is, the voltage of each of the detection electrodes 131 to 139. As in step S62, the CPU 151 stores the data of the voltage sequentially transmitted from the detection section 10a in the RAM 153. For example, in the RAM 153, the voltage information is stored with the time stamp at an address corresponding to the detection electrode. In step S66, the CPU 151 determines whether the distance between the detection section 10 a and the skin 16 is d3 based on the position information of the detection section 10 a input from the driving device 43, that is, whether the detection section 10 a is farthest from the skin 16. When the CPU 151 determines that the distance between the detection unit 10a and the skin 16 is a distance d3, the CPU 151 advances the process to step S66. On the other hand, when the CPU 151 determines that the distance between the detection unit 10a and the skin 16 does not become the distance d3, the CPU 151 executes the processing from step S65 onward. That is, the CPU 151 repeats the processes of steps S65 and S66, and acquires the voltage of each of the detection electrodes 131 to 139 until the detection unit 10a reaches the distance d3.

In step S67, the CPU 151 records the number of times the detection unit 10a approaches and leaves the skin 16 to the RAM 153. That is, when the CPU 151 finishes the first approach and departure measurement, it records 1 as the number of measurements, and increases 1 with respect to the number of measurements after the second and subsequent times. In step S68, the CPU 151 refers to the number of measurements recorded in the RAM 153 to determine whether the current number of measurements has reached a preset number N. When the CPU 151 judges that the number of measurements has reached the number N, the CPU 151 executes the processing of step S69. On the other hand, when the CPU 151 determines that the number of measurements has not reached the number N, the CPU 151 repeats steps S61 to S68 until the number of measurements reaches N.

In step S69, the CPU 151 obtains the time-varying voltage change (voltage waveform) of each of the detection electrodes 131 to 139 based on the respective voltages stored in the RAM 153 with respect to each of the detection electrodes 131 to 139. As described above, the voltage data of each of the detection electrodes 131 to 139 obtained in steps S62 and S65 are stored at the memory addresses corresponding to the detection electrodes 131 to 139 together with the time stamp showing the detection time. Therefore, the CPU 151 can obtain the time-dependent change of the voltage by reading the data of the memory address together with the time stamp. When the voltage input interval from the detection electrodes 131 to 139 to the processing device 15 is a certain time t, the time-dependent voltage change of the detection electrodes as shown in FIG. 2C and FIG. 3C can be obtained. In this step, the CPU 151 obtains time-varying voltage changes to the respective detection electrodes 131 to 139 in this way.

In this embodiment, the time-dependent voltage changes shown in FIGS. 2C and 3C can be obtained based on the detection voltages of the detection electrodes 131 to 139. The method for obtaining the voltage change is not limited to the example described above. For example, in FIG. 2C, the difference voltage between the voltage corresponding to the peak value on the left and the reference voltage (0 V in FIG. 2C) and the difference voltage between the voltage corresponding to the peak value on the right and the reference voltage can be obtained. . It is also possible to detect the first voltage of the detection electrode 131 at a distance d1 from the skin 16 which is the reference position, and similarly detect the second voltage corresponding to the distance d2 and the third voltage corresponding to the distance d3 to obtain the first voltage. The difference voltage from the second voltage and the difference voltage between the first voltage and the third voltage are changed as voltages.

In step S70, the CPU 151 determines the amount of water in the skin 16 based on the voltage change obtained in each of the detection electrodes 131 to 139 obtained in step S69. Such determination can be performed in the same manner as the determination of the wetness degree disclosed in Patent Document 1, for example. Here, an example of measuring the amount of water in the skin 16 using a change in voltage when the detection unit 10a approaches the skin 16 will be described. FIG. 8 is a pattern diagram showing the change of the chronological voltage of the detection electrode when the detection section 10a approaches the skin 16, and can show, for example, the first peak voltage from the left of FIG. 2C. In this step, the maximum voltage value Vmax of the detection voltage and the voltage rise time Tup until the voltage of 1/10 of the maximum voltage value Vmax reaches the maximum voltage value Vmax are used to determine the moisture content of the skin 16.

In this embodiment, in order to discriminate the water content, each water content per unit area of the skin of the sample is measured in advance under a similar condition to this measurement using a reliable other method (for example, 1 cc, 2 cc, 3 cc). ･). At the same time, the skin moisture content measuring device 40 is also used to measure the temporal voltage change of the detection electrodes 131 to 139. Thereby, the maximum voltage value Vmax and the voltage rise time Tup with respect to each water amount are obtained. In the measurement, it is assumed that there is no individual difference between each skin. In this embodiment, the maximum voltage value Vmax and the voltage rise time Tup (reference voltage rise time) obtained in advance and associated with each moisture amount are stored in the non-volatile memory 154 as the moisture amount reference data.

More specifically, in this step, the CPU 151 obtains the maximum voltage value Vmax and the voltage rise time Tup with respect to each of the detection electrodes 131 to 139 from the voltage changes of the detection electrodes 131 to 139 obtained in step S69. Further, the CPU 151 determines the amount of moisture in each area of the skin 16 facing each of the detection electrodes 131 to 139 based on the obtained maximum voltage value Vmax and the voltage rise time Tup and the moisture amount reference data stored in the non-volatile memory 154. The CPU 151 performs the above processing on each of the detection electrodes 132 to 139.

In step S71, the CPU 151 determines the water content of each of the detection electrodes 131 to 139 obtained by using step S70, that is, the water content of each of the regions facing the detection electrodes 131 to 139 relative to the skin 16 To obtain a two-dimensional distribution of the amount of water in the measurement area of the skin 16. The CPU 151 displays the obtained two-dimensional distribution on the display unit 156. Furthermore, as such a two-dimensional distribution, the method of detecting electrodes 131: x1 cc, detecting electrodes 132: x2 cc, detecting electrodes 133: x3 cc, and detecting electrodes 139: x9 cc will be different from those of each detecting electrode. The amount of water is summarized into a table, or as shown in FIG. 9, it is a matrix expression corresponding to the arrangement of each of the detection electrodes 131 to 139. In FIG. 9, the regions 91 to 99 correspond to the regions facing the detection electrodes 131 to 139 of the skin 16, respectively. In this example, in each of the areas 91 to 99, the water amount of the corresponding detection electrode that is separately identified can be displayed, and the water amount can be displayed in correspondence with the color. For example, a smaller amount of water can be set to light blue, and as the amount of water becomes larger, it can be set to dark blue, and the color corresponding to each of the regions 91 to 99 can be displayed (heat map display). When step S71 ends, this measurement is ended.

In addition, in this embodiment, although the maximum voltage value Vmax and the voltage rise time Tup are used in the determination of the water content in step S70, the elements used for determining the water content are not limited to this. In this embodiment, when the moisture content of the skin is measured using the detection portion 10a, the moisture content is determined based on the change in the detection voltage of the detection portion 10a in accordance with the change in the distance between the detection portion 10a and the skin. And in the graph showing the change of the chronological voltage, the shape of the generated peak is related to the moisture content of the skin. Therefore, it is important to determine the shape of the peak value of the chronological voltage change corresponding to the amount of water. In this embodiment, the maximum voltage value Vmax and the voltage rise time Tup are used as parameters for specifying the peak value. In this embodiment, the parameters are not limited to the maximum voltage value Vmax and the voltage rise time Tup, and any waveform can be used as long as it has a specific peak voltage waveform. For example, the maximum voltage value Vmax and half of the peak voltage may be used. Wide parameters. Alternatively, the amount of water may be determined using the voltage difference Vp-p (peak to peak) of the approaching and leaving portion of the detection unit 10a.

As described above, according to the present embodiment, when the moisture content of the skin 16 is measured, the detection portion 10a provided with the electret resin 14 is used, so that the skin can be charged without contact, and the moisture content of the skin can be estimated without contact. Therefore, it is possible to eliminate the variation of the measurement value caused by the contact between the detection part and the skin, and improve the estimation accuracy of the skin moisture content.

In addition, in this embodiment, since the moisture content of the skin can be measured in a non-contact manner as described above, the measurement can be performed without changing the skin 16 of the measurement target before and after the measurement, and the accuracy of the moisture measurement of the skin can be further improved. As before, when the detection part is brought into contact with the skin for measurement, there may be a distribution of the amount of water before the measurement due to the contact and the pressure of the detection part on the skin during the contact and the water during the measurement (during pressing). Possibility of changing the distribution of the servings. For other reasons, if there is a change in the amount of water caused by the contact, the value of the measured amount of water deviates from the true value. On the other hand, in this embodiment, since the measurement of the water content can be performed in a non-contact manner, the distribution change of the water content due to contact can be prevented.

Furthermore, in this embodiment, since the detection electrodes 131 to 139 arranged in an array are used, the distribution of the moisture content of the skin 16 can be obtained. In particular, in this embodiment, it is not limited to determine whether or not there is moisture in the measurement area of the skin 16, and it is possible to determine the specific amount of water in each area. That is, a quantitative scale of the amount of water in the measurement area of the skin 16 can be obtained.

(Second Embodiment)
This embodiment is a person who detects a change in static electricity on the skin in a non-contact manner and evaluates the moisturizing effect of the skin's cosmetic. That is, in this embodiment, similarly to the first embodiment, the detection unit including the electret resin is brought closer to or away from the detector. Furthermore, the voltage change of the skin to which the cosmetic is applied is compared with the voltage change of the detection portion of the skin to which the cosmetic is not applied to evaluate the moisturizing effect of the cosmetic.

FIG. 10 is a flowchart showing a method for evaluating the moisturizing effect of the skin cosmetic material according to this embodiment. In this embodiment, the acquisition of the voltage changes in steps S102 and S104 described later is performed using the measurement device 100 having the same configuration as the skin moisture measurement device 40 described in the first embodiment. That is, the measurement device 100 includes a detection section 10 a, a processing device 15, a fixing section 41, a support section 42, a driving device 43, an attenuation circuit 44, a buffer amplifier 45, an A / D converter 46, an input operation section 155, and a display section 156. . In this embodiment, the processing device 15 further includes a timer as a time-lapse mechanism for measuring time. The ROM 152 of the processing device 15 stores a computer program and the like shown in FIG. 11.

In step S101, the detection unit 10a is separated from the skin 16 so that the electret resin 14 faces the skin 16 of the measurement target and is located at the initial position. In this state, it is preferable that the contact portion 42a is opposed to the skin. 16 fixed with strap. Alternatively, the contact portion 42 a may be attached to the skin 16 by an adhesive or the like. In this way, the detection unit 10a is provided with respect to the skin 16 which is a measurement target.

Step S102 is a process of obtaining a change in the temporal voltage of the detection section 10a of the skin 16 to which the cosmetic is not applied. FIG. 11 is a flowchart showing a processing procedure of the acquisition unit 10a according to the present embodiment for the time-dependent voltage change of the detection unit 10a when the skin approaches or leaves the skin. This processing sequence is processing executed by the CPU 151 provided in the processing device 15. Therefore, the control of the processing is performed by the CPU 151 reading and executing the program shown in FIG. 11 stored in the ROM 152 and executing the program. The measurement in this step is performed with the detection unit 10a approaching and leaving the skin 16 at one cycle, and performing one cycle at 10-second intervals (measurement time in step S102).

Along with the start of step S102, the elapsed time of the timer of the processing device 15 is started, and the CPU 151 performs steps S111 to S116 in the same manner as steps S61 to S66. In this way, the CPU 151 acquires the detection voltage for each of the detection electrodes 131 to 139 by the detection unit 10a for one cycle of the approach and separation of the skin 16. In step S117, the CPU 151 refers to the timer provided in the processing device 15 to obtain the elapsed time from step S102. In step S118, the CPU 151 determines whether the elapsed time obtained in step S117 has passed the measurement time in step S102, that is, 10 minutes. In addition, in this embodiment, as described above, since the approach and departure of one cycle and two seconds are repeated with respect to the measurement of 10 minutes, a voltage waveform of 300 cycles (as shown in FIG. 2C) is obtained after 10 minutes have passed. Change), which are stored in the RAM 153 in a manner known in the order of acquisition.

When it is determined that 10 minutes have elapsed, the CPU 151 advances the processing to step S119. On the other hand, when it is determined that 10 minutes have not elapsed, the CPU 151 proceeds to step S111 and repeats steps S111 to S118 until the elapsed time has passed 10 minutes.

In step S119, the CPU 151 obtains a voltage waveform of 300 cycles stored in the RAM 153 for the detection electrode 131, and calculates the peak voltage when approaching (for example, the peak voltage on the left side of FIG. 2C) and the peak voltage when leaving. (For example, the peak voltage on the right side of FIG. 2C). Further, the CPU 151 plots the voltage difference Vp-p on the coordinates in the order of the measurement time from morning to night. That is, a graph is prepared with the horizontal axis as time and the vertical axis as voltage difference Vp-p. Next, based on the graph, the CPU 151 obtains the time-dependent voltage change of the skin 16 to which the cosmetic is not applied. The CPU 151 similarly obtains the time-dependent voltage change of the skin 16 to which the cosmetic is not applied for each of the detection electrodes 132 to 139 as the voltage difference Vp-p. The CPU 151 stores the voltage changes of the respective detection electrodes 131 to 139 thus obtained in the RAM 153.

Returning to FIG. 10, in step S103, the skin 16 facing the detection unit 10 a is coated with the cosmetic material to be measured. More specifically, the filter paper is dipped in the cosmetic material, and the filter paper impregnated with the cosmetic material is inserted from the space between the detection section 10a and the skin 16 and contacts the area of the skin 16 opposite to the detection section 10a, and is taken after a certain period of time. Under the filter paper. In addition, in this embodiment, the filter paper is used as a method for applying the cosmetic material to the skin, but it is not limited to this. For example, as long as it is a cloth or a brush, or a human finger, the cosmetic material can be held, Any method may be used for applying the cosmetic to the object. The supply of the cosmetic material to the skin 16 is not limited to the application, and the dropping or spraying of the cosmetic material may be used.

Step S104 is the same process as that of step S102, and is a process of obtaining the change in voltage of the skin 16 to which the cosmetic is applied under the same conditions as the measurement in step S102. That is, the CPU 151 executes the program shown in FIG. 11 to perform various processes in this step. Because such specific processing is the same as step S102, the description thereof is omitted. In this step, the CPU 151 obtains the time-dependent voltage difference Vp-p of the skin 16 coated with cosmetics for each of the detection electrodes 131 to 139. A tag indicating the acquisition order is assigned to each voltage change and stored in the RAM 153.

In step S105, by comparing the voltage change on the skin 16 without applying the cosmetic material obtained in steps S102 and S104 with the voltage change on the skin 16 having the cosmetic material applied, the skin 16 coating is evaluated. Moisturizing effect of cloth cosmetics. In this embodiment, the CPU 151 reads the change in voltage of the skin 16 to the detection electrode 131 stored in the RAM 153 to the uncoated cosmetic material, and the change in voltage to the skin 16 to which the cosmetic product is applied, and obtains it. Overlapping graphics. Next, the CPU 151 displays the obtained superimposed figure on the display unit 156. The CPU 151 also performs this processing on each of the detection electrodes 132 to 139, obtains an overlay pattern with respect to each of the detection electrodes 132 to 139, and appropriately displays the same on the display unit 156.

FIG. 12 is a schematic diagram of an overlapping pattern in which the voltage change to the skin 16 to which the cosmetic is not applied and the voltage change to the skin 16 to which the cosmetic is applied in this embodiment are superimposed. In FIG. 12, the horizontal axis is time (seconds), and the vertical axis is voltage difference Vp-p. Each voltage difference Vp-p is a voltage difference between two peaks in one cycle of a two-second interval, so it is calculated every two seconds corresponding to one cycle. Therefore, 300 cycles are drawn in ascending order, which is synonymous with drawing every 2 seconds. Therefore, although the graphs 121 and 122 are depicted as continuous lines in FIG. 12, they are actually discontinuous lines.

In FIG. 12, a graph 121 is a graph showing a change in voltage to the skin 16 without applying the cosmetic, and a graph 122 is a graph showing a change in voltage to the skin 16 having the cosmetic applied. In this embodiment, the voltage Vp-p is related to a change in the voltage caused by the approaching or leaving of the detection section 10a to the skin 16. Therefore, when the cosmetics are not applied, it is considered that there is almost no change in static electricity caused by approaching or leaving, so the voltage Vp-p in the pattern 121 is substantially fixed. On the other hand, in the case of applying a cosmetic material (Figure 122), it is considered that the voltage is changed by approaching or leaving due to the cosmetic material applied to the skin. Therefore, immediately after the measurement, the voltage Vp-p significantly changes compared to the case where the cosmetic is not applied (Figure 121). Thereafter, the moisture immersed in the skin 16 due to the application of the cosmetic material will evaporate from the applied skin 16 over time. Therefore, the voltage Vp-p changes to a state close to the uncoated cosmetic material as time passes. That is, the voltage Vp-p gradually approaches the pattern 121 as time passes.

In the example of FIG. 12, the figure 122 and the figure 121 are substantially the same at 370 seconds. Therefore, for example, the moisturizing effect of the cosmetic can be evaluated to 370 seconds. In this embodiment, an overlapping pattern with respect to each of the detection electrodes 131 to 139 is displayed on the display unit 156. Therefore, for each of the detection electrodes 131 to 139, the observer can judge the moisturizing effect based on the display of the display unit 156.

In the present embodiment, the overlay pattern is displayed on the display unit 156 for evaluation, but the overlay pattern may be printed. Alternatively, the results of voltage changes such as overlay graphics can be transferred to other information processing devices via an portable medium such as a network or flash memory, and the information processing device can be used for evaluation.

When the evaluation in step S105 is completed, the evaluation method is ended.

Alternatively, the evaluation of step S105 may be performed using the processing device 15. In this case, the measurement device 100 functions as a moisturizing effect evaluation device. That is, the CPU 151 reads the voltage change of the detection electrodes 131 to 139 stored in the RAM 153 after the end of step S104, and changes the voltage of the skin 16 to which the cosmetic is not applied and the voltage of the skin 16 to which the cosmetic is applied. Compare changes. With this, the CPU 151 can evaluate the moisturizing effect of the cosmetics of the skin 16.

An example of a specific method for evaluating the moisturizing effect will be described. Based on the voltage change stored in the RAM 153, the CPU 151 obtains the overlay pattern shown in FIG. 12 for each of the detection electrodes 131 to 139 in the same manner as described above. The CPU 151 compares the graph 122 of the voltage change of the skin 16 coated with the cosmetic material with the graph 122 and the graph 121 of the voltage change of the skin 16 without the cosmetic material coated with it to obtain the time when the two graphs are substantially the same. Here, in FIG. 12, the coincidence time is 370 seconds. The CPU 151 can judge (evaluate) that the moisturizing effect continues until a consistent time. The portion where the pattern 121 and the pattern 122 are consistent is, for example, an overlapped pattern shown in FIG. 12, and the time when the difference between the voltage Vp-p of the pattern 121 and the voltage Vp-p of the pattern 122 becomes a specific value or less can be captured. That is, in the overlay graph, the CPU 151 calculates the voltage difference between the voltage Vp-p of the graph 121 and the voltage Vp-p of the graph 122 in order from the smaller time in sequence at each time, and captures the time when the voltage difference becomes below a specific value. , The time when the voltage difference first falls below a certain value is set as the coincidence time.

The CPU 151 determines the distribution of the moisturizing effect of the skin 16 by obtaining a consistent time for each of the detection electrodes 131 to 139 as described above.

In addition, in this embodiment, the change in voltage used for the evaluation of the moisturizing effect is a change over time in relation to the voltage Vp-p of the voltage waveform of the period of time when the detection section 10a approaches or leaves the skin 16, but it may The time-dependent voltage change associated with any one of the maximum or minimum value of the voltage waveform in 1 cycle is used. In this case, the CPU 151 captures the maximum or minimum voltage for each of the 300-cycle voltage waveforms, and uses the captured maximum or minimum voltage as the vertical axis and each cycle (time) as the horizontal axis to make a chart. In addition, the CPU 151 obtains a voltage change with respect to the skin 16 to which the cosmetic is not applied and a voltage change with respect to the skin 16 to which the cosmetic is applied, and can compare the two to evaluate the moisturizing effect of the cosmetic.

As described above, according to this embodiment, when the moisturizing effect of the cosmetic is evaluated, since the detection unit 10a equipped with the electret resin 14 is used, the skin can be charged without contact and the voltage corresponding to the cosmetic (water content) is detected. Variety. In addition, it is possible to eliminate deviations in the measured values caused by the contact of the detection portion with the skin, and to improve the accuracy of the evaluation of the moisturizing effect.

In addition, in this embodiment, the moisturizing effect of the cosmetic can be measured in a non-contact manner. Therefore, the measurement can be performed without changing the skin of the measurement object before and after the measurement, and the accuracy of the moisturizing effect evaluation can be further improved. That is, as described in the first embodiment, it is possible to prevent a change in the distribution of the amount of water due to contact.

Furthermore, in this embodiment, since the detection electrodes 131 to 139 arranged in an array are used, the distribution of the moisturizing effect of the cosmetic material for the skin 16 can be obtained.

(Example)
Using the measurement device 100 described above, moisturizing was performed on each of the case where the subject A was coated with distilled water (Experiment 1) and the case where the subject A was coated with a glycerin solution (concentration 10%) (Experiment 2) Evaluation of effects.

Experiments 1 and 2 were performed in an environment with a humidity of 43%. For Experiment 1 and Experiment 2, in each of steps S102 and S104 of FIG. 10, the skin was measured by the detection unit 10a for 10 minutes at intervals of 2 seconds for 10 minutes. Furthermore, regarding Experiment 1 and Experiment 2, in step S103, a 30 mm × 30 mm filter paper was used to apply distilled water and a glycerin solution. During the application, the skin of the subject A was immersed in distilled water or glycerin. Remove the filter paper from the solution after 10 minutes. Under such experimental conditions, the method shown in FIG. 10 is used to obtain an overlay pattern.

FIG. 13A is a graph showing changes with time in voltage related to the evaluation of the moisturizing effect in the case where distilled water is applied in this example. FIG. 13B is a graph showing changes with time in voltage related to the evaluation of the moisturizing effect when a glycerin solution is applied. In FIG. 13A, a graph 1300 is a graph showing a voltage change in a case where distilled water is not applied to the skin of subject A, and a graph 1301 is a first measurement in a case where distilled water is applied to the skin of subject A The graph of the related voltage change, and the graph 1302 is a graph showing the voltage change related to the second measurement when the skin of the subject A is coated with distilled water. Further, in FIG. 13B, a graph 1303 is a graph showing a voltage change when the glycerin solution is not applied to the skin of the subject A, and a graph 1304 is a graph showing the first case where the glycerin solution is applied to the skin of the subject A The graph of the voltage change related to the first measurement, and the graph 1305 is a graph showing the voltage change related to the second measurement when the glycerin solution was applied to the skin of the subject A.

As can be seen from FIG. 13A and FIG. 13B, when the skin is not coated with distilled water or glycerin solution, the voltage Vp-p becomes substantially constant even after the passage of time (graphs 1300 and 1303). On the other hand, in the case where distilled water is applied to the skin (patterns 1301, 1302) and the case where glycerin is applied to the skin (patterns 1304, 1305), the voltage Vp-p decreases significantly as the measurement starts, Later, it gradually increased with the passage of time, and finally gradually approached the figures 1300 and 1303. When distilled water or a glycerin solution is applied to the skin, the distilled water or the glycerin solution is reduced over time due to volatilization, etc., and the skin is in a state where the distilled water or the glycerin solution is not applied. When the cosmetic is applied to the skin instead of distilled water or glycerin, the moisturizing effect of the cosmetic can also be evaluated by the same method.

In addition, in this embodiment, the detection unit 10a is used to obtain the voltage change on the skin without the cosmetic material and the voltage change on the skin with the cosmetic material, and the moisturizing effect can be evaluated by comparing these voltage changes. Therefore, the criteria or indicators for evaluation are not limited to those described in this embodiment, and other criteria or indicators may be used.

10‧‧‧Testing Department

10a‧‧‧Testing Department

11‧‧‧ ground electrode

12‧‧‧ insulator

13‧‧‧detection electrode

13a‧‧‧ Detection electrode section

14‧‧‧Electret resin

15‧‧‧treatment device

16‧‧‧Skin

20‧‧‧Measurement object

22‧‧‧ Graphics

23‧‧‧ Graphics

24‧‧‧ Graphics

25‧‧‧ Graphics

30‧‧‧ Graphics

31‧‧‧ Graphics

32‧‧‧ Graphics

33‧‧‧ Graphics

40‧‧‧ skin moisture measuring device

41‧‧‧Fixed section

42‧‧‧Support Department

42a‧‧‧Contact

43‧‧‧Drive

44‧‧‧ Attenuation circuit

45‧‧‧Buffer Amplifier

46‧‧‧A / D converter

50‧‧‧ Multiplexer

91 ～ 99‧‧‧area

100‧‧‧ measuring device

121‧‧‧ Graphics

122‧‧‧ Graphics

131 ～ 139‧‧‧ Detection electrode

151‧‧‧CPU

152‧‧‧ROM

153‧‧‧RAM

154‧‧‧Non-volatile memory

155‧‧‧Input operation section

156‧‧‧Display

1300‧‧‧ Graphics

1301‧‧‧ Graphics

1302‧‧‧ Graphics

1303‧‧‧ Graphics

1304‧‧‧ Graphics

1305‧‧‧ Graphics

d1‧‧‧distance

d2‧‧‧distance

d3‧‧‧distance

P‧‧‧Arrow direction

S61 ～ S71‧‧‧‧Steps

Steps S101 ～ S105‧‧‧‧

S111 ～ S119‧‧‧step

t‧‧‧time

Tup‧‧‧Voltage rise time

V‧‧‧Voltage

Vmax‧‧‧Maximum voltage value

Vp-p‧‧‧Voltage difference

FIG. 1 is a schematic diagram showing a configuration of a measuring device according to an embodiment of the present invention.

FIG. 2A is a diagram for explaining a configuration in which a detection unit according to an embodiment of the present invention is approached or separated vertically with respect to a measurement object.

FIG. 2B is a graph showing a voltage change in a detection section without an electret resin.

FIG. 2C is a graph showing the measurement results of the skin moisture content of the voltage change in the detection unit according to an embodiment of the present invention.

FIG. 3A is a diagram for explaining a configuration in which a detection unit according to an embodiment of the present invention is moved toward or away from a measurement object in parallel.

FIG. 3B is a graph showing a voltage change in a detection section without an electret resin.

FIG. 3C is a graph showing a voltage change of a detection section according to an embodiment of the present invention.

FIG. 4 is a block diagram of a skin moisture measuring device according to an embodiment of the present invention.

FIG. 5 is a diagram showing a configuration of electrodes arranged in an array in a detection section according to an embodiment of the present invention.

FIG. 6 is a flowchart showing a processing sequence for estimating skin moisture content according to an embodiment of the present invention.

FIG. 7 is a diagram showing the approaching and leaving positions of a detection section according to an embodiment of the present invention.

FIG. 8 is a diagram for explaining a method for measuring skin moisture content according to an embodiment of the present invention.

FIG. 9 is a graph showing the distribution of skin moisture content according to one embodiment of the present invention.

FIG. 10 is a flowchart showing a method for evaluating a moisturizing effect according to an embodiment of the present invention.

FIG. 11 is a flowchart showing a processing procedure for obtaining a voltage change of a detection unit according to an embodiment of the present invention.

FIG. 12 is a diagram for comparing the moisturizing effect of one embodiment of the present invention.

FIG. 13A is a graph showing a voltage change in a case where distilled water is applied according to an embodiment of the present invention.

FIG. 13B is a graph showing a voltage change in a case where a glycerin solution is applied according to an embodiment of the present invention.

Claims (10)

A method for measuring skin moisture content, which has the following steps: A detection portion having a plurality of electrode portions having an electret resin and a conductor arranged in an array is approached or separated from the skin without contacting the skin, while detecting a change in voltage of the plurality of electrode portions; and The amount of water in the skin is determined based on the voltage change. For example, the skin moisture content measuring method according to claim 1, wherein the determining step determines the distribution of the moisture content based on the voltage change of each of the plurality of electrode portions. For example, the method for measuring the amount of skin moisture in claim 1 or 2, wherein the detecting step detects the first voltage of the detecting section at a first distance from the skin, and the detecting section of the detecting section at a second distance shorter than the first distance. A second voltage, a third voltage of the detection unit, and a third voltage of a third distance longer than the first distance, and based on a difference voltage between the first voltage and the second voltage, and a difference voltage between the first voltage and the third voltage Each of them obtains the above-mentioned voltage change. A method for evaluating the moisturizing effect, which has the following steps: Apply cosmetics to the skin; A detection section having a plurality of electrode sections having an electret resin and a conductor arranged in an array form approaches or moves away from the skin without contacting the skin, while detecting a change in voltage of the plurality of electrode sections; and The moisturizing effect of the cosmetic is evaluated by comparing the voltage change of the skin to which the cosmetic is applied and the voltage change of the skin to which the cosmetic is not applied. The method for evaluating a moisturizing effect according to claim 4, wherein the evaluation step determines the distribution of the moisturizing effect of the skin based on the voltage change of each of the plurality of electrode portions. If the method for evaluating the moisturizing effect according to claim 4 or 5, the detection step detects the first voltage of the detection unit at a first distance from the skin and the second voltage of the detection unit at a second distance shorter than the first distance. A voltage, a third voltage of the detection unit of a third distance longer than the first distance, and based on each of the difference voltage between the first voltage and the second voltage, and the difference voltage between the first voltage and the third voltage This results in the above voltage change. The method for evaluating the moisturizing effect according to claim 4 or 5, wherein the coating step has the following steps: Impregnating the aforementioned cosmetic with a medium capable of holding the aforementioned cosmetic; and The cosmetic is applied to the skin by bringing the impregnated medium into contact with the skin and removing it after a certain period of time. A skin moisture measuring device includes: A detection section in which a plurality of electrode sections having an electret resin and a conductor are arranged in an array; and The determination section detects the voltage change of the plurality of electrode sections while approaching or leaving the detection section without contacting the skin, and determines the moisture content of the skin based on the voltage change. A moisturizing effect evaluation device comprising: A detection section in which a plurality of electrode sections having an electret resin and a conductor are arranged in an array; and The determination unit can detect the change in voltage of the plurality of electrode portions while causing the detection portion to approach or leave without contact with the skin, and can detect the change in voltage of the skin to which the cosmetic is applied and not to apply the change. The voltage change of the skin of the cosmetic is compared to evaluate the moisturizing effect of the cosmetic. A measuring device comprising: A detection section, in which a plurality of electrode sections having an electret resin and a conductor are arranged in an array; A mechanism for repeatedly accessing and leaving the above-mentioned detection section without contacting the skin; A mechanism for detecting the voltage of each of the plurality of electrode portions after a specific time has elapsed since the start of the approach and departure; and A mechanism for obtaining a change in voltage at the specific time for each of the plurality of electrodes based on the voltage.