JP2019154804A - Skin condition measurement device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a skin condition measuring device for acquiring physical information on a plurality of skin including skin moisture content by also measuring a pressing force against the skin of a capacitance type sensor with a simple configuration. SOLUTION: A flexible sensor holding portion 13 in which a bending amount corresponding to a pressure is generated when a skin as an object to be measured is pressed, and the sensor holding portion 13 provided and pressed against the sensor holding portion 13. The first electrode portion which is capacitively coupled to the skin, the second electrode portion which is provided in the sensor holding portion 13 and whose resistance value changes according to the amount of bending of the sensor holding portion 13, and the sensor holding portion 13. A measuring means that is connected and controls the voltage applied to the first electrode portion and the second electrode portion to acquire the capacitance value and the pressure value when the skin is pressed against the skin, and the acquired measurement means. The skin condition measuring device 1 is provided with an information acquisition means for acquiring physical information of the skin based on measurement data which is a combination of a capacitance value and a pressure value over time. [Selection diagram] Fig. 2

Description

  The present invention relates to a skin condition measuring apparatus.

  2. Description of the Related Art Conventionally, a skin moisture measuring device has been used as a device for measuring the moisture content of skin, which is one of skin conditions. As the skin moisture content measuring apparatus, one using a capacitive sensor is well known. An apparatus for measuring skin moisture using a capacitive sensor applies a pair of electrodes covered with glass, which is an insulator, to the skin, and forms a capacitor using the skin's stratum corneum as a dielectric. The change in capacitance value is measured. Since the capacitance value of the capacitor varies depending on the moisture content of the skin, which is a dielectric, the moisture content of the skin can be measured by measuring the capacitance value.

  In such a skin condition measuring apparatus, it is known that the degree of adhesion to the skin when applying an electrode pair to the skin in order to measure the moisture content of the skin is a very important factor in the stability of the measurement. . For example, in the skin moisture content measuring apparatus of Patent Document 1, the sensor holding unit that holds the electrode pair is recessed inside the apparatus, and means for notifying that the pressing force to press against the skin has reached an optimum value. This makes stable measurement possible. In addition, in the skin moisture content measuring apparatus of Patent Document 2, it is determined that the pressing force pressed against the skin has reached an optimal value as in Patent Document 1, but after a certain period of time since reaching the optimal pressure, the skin By outputting the calculated amount of moisture, it is possible to output the amount of skin moisture measured in a stable state.

JP 2003-169787 A JP 2003-169788 A

Peter Clarys et.al., “Influence of probe application pressure on in vitro and in vivo capacitance (Corneometer CM 825) and conductance (Skicon 200 EX) measurements”, Skin Research and Technology 2011; 17: 445-450.

  All of these techniques are based on the premise that in order to accurately measure the skin moisture content, it is necessary to measure the moisture content while pressing it against the skin at an optimal constant pressure. Non-Patent Document 1 reports that when the moisture content of the skin is measured with a capacitance sensor, the detected value changes depending on the strength of the pressure applied to the skin. As described above, in the conventional measurement of skin moisture content, it has been considered that the strength of the pressure applied to the skin needs to be constant for accurate measurement.

  However, the present inventors diligently studied the relationship between the pressure applied to the skin of the capacitive sensor and the detected value, and found that when the moisture content of the skin was measured, the capacitance sensor was pressed against the skin. It is not always necessary to keep the pressure constant. Rather, by measuring the pressing force against the skin of the capacitive sensor in conjunction with the measurement of the capacitance value, in addition to the moisture content of the skin, The present inventors have found that a skin condition such as an uneven state of the skin can be estimated and have arrived at the present invention.

  This invention is made | formed in view of the said knowledge, Comprising: The subject of this invention is related with the several skin containing skin moisture content by also measuring the pressing force with respect to the skin of a capacitance-type sensor with simple structure. It is to acquire physical information.

  In order to solve the above-described problem, the invention described in one embodiment includes a flexible sensor holding unit that generates a deflection amount according to pressure when skin to be measured is pressed. A second electrode provided on the sensor holding part and capacitively coupled to the pressed skin, and a second electrode provided on the sensor holding part, the resistance value of which changes according to the amount of deflection of the sensor holding part. Capacitance value and pressure value when the skin is pressed by controlling the voltage applied to the first electrode portion and the second electrode portion. A skin condition characterized by comprising: a measurement means for acquiring skin information; and an information acquisition means for acquiring physical information on the skin based on measurement data that is a combination of the acquired capacitance value and pressure value over time It is a measuring device.

  In the invention described in the first aspect with reference to one embodiment, the information acquisition means acquires a skin moisture amount based on the capacitance value when saturated, and the static with respect to the change in the pressure value. The rough skin state is acquired according to the change behavior of the capacitance value.

  In the invention described in a second aspect with reference to one embodiment, the information acquisition unit acquires a skin moisture class based on a maximum value of the capacitance value, and the electrostatic capacitance with respect to a change in the pressure value. The rough skin state is acquired according to the change behavior of the capacitance value.

  The invention described in another embodiment is provided in a flexible sensor holding unit that generates a deflection amount according to pressure when skin to be measured is pressed, and the sensor holding unit. A first electrode portion that capacitively couples to the pressed skin, a second electrode portion that is provided in the sensor holding portion and has a resistance value that changes according to the amount of deflection of the sensor holding portion, and the sensor A measuring unit connected to a holding unit and controlling a voltage applied to the first electrode unit and the second electrode unit to acquire a capacitance value and a deflection amount when pressing the skin; A skin condition measuring apparatus comprising: information acquisition means for acquiring physical information of skin based on measurement data that is a combination of the acquired capacitance value and deflection amount with time.

  In the invention described in the first aspect with reference to another embodiment, the information acquisition unit acquires a skin moisture amount based on the capacitance value when saturated, and responds to a change in the deflection amount. A rough skin state is acquired according to the behavior of the change in the capacitance value.

  In the invention described in the second aspect with reference to another embodiment, the information acquisition unit acquires a skin moisture class based on the maximum value of the capacitance value, and the change with respect to the change in the amount of deflection. The rough skin state is acquired according to the behavior of the change in capacitance value.

  The invention described in another aspect with reference to the above-described embodiment further includes a case that accommodates the measurement unit and the information acquisition unit, and the sensor holding unit is detachably attached to the case.

It is an external appearance perspective view which shows an example of the skin state measuring apparatus of this embodiment. It is a schematic diagram which shows the measurement state by a skin state measuring apparatus. It is an external appearance perspective view which shows another example of the skin state measuring apparatus of this embodiment. It is a block diagram which shows the electric circuit structure of the skin state measuring apparatus of this embodiment. It is a figure which shows an example of measurement data. It is a figure which shows the result of having measured different skin conditions.

  Hereinafter, embodiments of the present invention will be described in detail.

  FIG. 1 is an external perspective view showing an example of a skin condition measuring apparatus of the present embodiment, FIG. 2 is a schematic diagram showing a measurement state by the skin condition measuring apparatus of the present embodiment, and FIG. 3 is a skin of the present embodiment. It is an external appearance perspective view which shows another example of a state measuring apparatus. As shown in FIG. 1, the skin condition measuring apparatus 1 of the present embodiment includes a sensor unit 10, a connector unit 20, and a main body unit 30. The sensor unit 10 is attached to the main body unit 30 via the connector unit 20.

  The sensor unit 10 includes a capacitance type sensor 11, a strain gauge sensor 12, and a flat holding member 13 that holds these sensors 11 and 12. As shown in FIG. 2, the holding member 13 is configured to bend according to the pressing force when the skin as the measurement target is pressed against a portion where the capacitive sensor 11 is provided. For the holding member 13, for example, a printed board material such as glass epoxy, paper phenol, and paper epoxy, or a flexible material such as PET film, PEN film, and PI film can be used. In the skin condition measuring apparatus of the present embodiment, the strain gauge sensor 12 detects the amount of bending of the holding member 13, and therefore, in this specification, “deflection amount” and “strain amount” are the same physical quantity. It is described as a term representing.

  As shown in FIG. 1, the capacitance type sensor 11 is a comb-shaped electrode pair formed so as to face each other on the same surface of the holding member 13. The capacitive sensor 11 is not limited to this form, and may be a form in which electrode pairs having different areas are provided facing each other on the front and back surfaces of the holding member 13, and a known capacitive sensor is used. be able to. For example, a conductive material such as copper, silver, gold, aluminum, nickel, and tin can be used as the electrode material that constitutes the capacitive sensor 11.

  The strain gauge sensor 12 can be configured as an electrode formed such that the resistance value changes according to the amount of bending of the holding member 13 when the sensor unit 10 is pressed against the object to be measured. As the electrode material constituting the strain gauge sensor 12, for example, a conductive material such as copper, silver, gold, aluminum, nickel, or tin can be used. The strain gauge sensor 12 can directly measure the amount of change in the resistance value according to the amount of deflection of the holding member 13, but the holding member 13 is configured to bend according to the applied pressure. It can be said that the pressure with respect to the sensor unit 10 can be detected by measuring the amount of change in the resistance value according to. That is, it can be said that the pressing force can be measured indirectly by measuring the amount of deflection (distortion amount).

  The capacitance type sensor 11 needs to be provided on the holding member 13 so that the detection surface is formed on the contact surface side with the skin, but the strain gauge sensor 12 detects the amount of bending of the holding member 13. Since it should just be possible, you may provide not only on the contact surface side with skin but on the back side of the contact surface with skin. When provided on the back side, as shown in FIG. 3, the strain gauge sensor 12 and the capacitive sensor 11 are provided on separate surfaces of the holding member 13. The method of providing the strain gauge sensor 12 is not limited to the surface of the holding member 13, and the holding member 13 may be formed in a multilayer and provided in the intermediate layer.

  The connector unit 20 may be a conductive adhesive or the like that fixes the sensor unit 10 to the main body unit 30, or may be configured to attach the sensor unit 10 to the main body unit 30 in a detachable manner. For example, it can be set as the structure attached so that attachment or detachment is possible by the structure which clamps the sensor part 10 with the leaf | plate spring provided in the entrance of the main-body part 30. FIG. In this case, as the connector part 20, for example, a flexible printed circuit board connector such as 504281 manufactured by Nihon Molex can be used.

  The main body 30 has a power source and an electronic circuit part for controlling the capacitance type sensor 11 and the strain gauge sensor 12 provided in the sensor unit 10, and a case part for protecting the power source and the electronic circuit part. Have. The case portion of the main body 30 is provided as necessary, and can be shaped as long as it can be used as a handle when protecting the power supply and the electronic circuit portion or gripping the skin condition measuring device. Is not particularly limited.

  In the skin condition measuring apparatus of the present embodiment, the capacitance type sensor 11 and the strain gauge sensor 12 of the sensor unit 10 are respectively connected to a power source and an electronic circuit part provided in the main body unit 30. The voltage applied to the capacitance type sensor 11 and the strain gauge sensor 12 is controlled by the power source and the electronic circuit portion in the main body 30, and the measured values of the capacitance and the strain amount (deflection amount) are acquired. . When measuring, the sensor unit 10 is pressed against the skin to be measured and the measurement is performed. When the sensor unit 10 is pressed against the skin, the moisture content of the skin is measured via the capacitive sensor 11, and the sensor unit 10 bends according to the pressing pressure as shown in FIG. The pressing pressure is measured via the strain gauge sensor 12.

  By the way, the capacitance type sensor 11 performs measurement by pressing against an object. However, it is known that the measurement value in the capacitance type sensor 11 is different when the pressure at the time of pressing is different (as described above). Patent Document 1). That is, even if the skin has the same amount of moisture, the measured value of the capacitive sensor 11 at different pressing forces varies depending on the softness and the surface roughness. According to the skin condition measuring apparatus 1 of the present embodiment, the pressing force when the moisture content of the skin is measured by the capacitive sensor 11 can be simultaneously measured in time series by the strain gauge sensor 12. The measured value of the capacitance type sensor 11 according to the pressure and its change tendency can be evaluated.

  FIG. 4 is a block diagram showing an electric circuit configuration of the skin condition measuring apparatus of the present embodiment. In FIG. 4, the skin condition measuring apparatus 1 of the present embodiment is connected to the first signal conversion unit 31 connected to the capacitive sensor 11 of the sensor unit 10 and the strain gauge sensor 12 of the sensor unit 10. A second signal conversion unit 32, a signal processing unit 34 connected to the first signal conversion unit 31 and the second signal conversion unit 32, a power source 33 connected to the signal processing unit 34, a storage unit 35, A display unit 36 and a communication unit 37 are shown. Note that the first signal converter 31, the second signal converter 32, the power source 33, and the signal processor 34 correspond to the power supply and electronic circuit provided in the main body 30 described above. A storage unit 35, a display unit 36, and a communication unit 37.

  The first signal conversion unit 31 is connected to the capacitive sensor 11 and the signal processing unit 34. The first signal conversion unit 31 is controlled by the signal processing unit 34, and controls and applies a voltage to the capacitive sensor 11 via the signal processing unit 34, and the capacitance value at that time Measure. The first signal conversion unit 31 sends a data signal of the measured capacitance value to the signal processing unit 34. For example, the first signal conversion unit 31 connects a component serving as a resistance component and a component serving as an inductance in parallel to the capacitive sensor 11, and generates an AC voltage having a predetermined frequency and a predetermined amplitude. It is applied to the capacitance type sensor 11 and can be measured as a value indicating the capacitance value based on the change in the current value with respect to the change in the applied predetermined AC voltage. For example, as a means for detecting a value indicating a capacitance value in the first signal conversion unit 31, a capacitance detection IC (LC717A) manufactured by ON Semiconductor can be used.

  The second signal conversion unit 32 is connected to the strain gauge sensor 12 and the signal processing unit 34. The second signal conversion unit 32 is controlled by the signal processing unit 34, controls the voltage applied to the strain gauge sensor 12 via the signal processing unit 34, and measures the resistance value at that time. The second signal converter 32 sends a data signal of the measured resistance value to the signal processor 34. For example, the second signal converter 32 applies a predetermined voltage to the strain gauge sensor 12 with respect to the strain gauge sensor 12, and measures the amount of change in the resistance value based on the change in the current value with respect to the applied predetermined voltage. can do. For example, as a means for measuring the resistance value in the second signal converter 32, a signal detection mechanism having a strain gauge bridge and an operational amplifier (Avia Semiconductor HX711) can be used.

  The signal processing unit 34 receives a value indicating the capacitance value from the first signal conversion unit 31 in time series and also receives a change in resistance value from the second signal conversion unit 32 in time series. The signal processing unit 34 accumulates the set of the received capacitance value and the resistance value as time series data, and extracts the corresponding data from the data table of the storage unit 35 using the accumulated time series data. To generate measurement data.

  The storage unit 35 stores a first data table in which a value indicating a capacitance value and a skin moisture amount are linked, and a second data table in which a resistance value and a pressure (amount of strain) are linked. is doing. First, the signal processing unit 34 extracts the pressure (strain amount) corresponding to the resistance value of the time series data from the second data table, and generates measurement data by combining with the capacitance value corresponding to the time series. To do. This measurement data is generated based on the values obtained from the sensors 11 and 12, and is the capacitance value (or data indicating the capacitance value) and pressure (or data indicating the pressure or the amount of deflection). ).

  Further, the signal processing unit 34 obtains a skin moisture content detection value by extracting the skin moisture content corresponding to the largest capacitance value in the measurement data from the first data table. The signal processing unit 34 stores a skin moisture class determination table for determining a skin moisture class for each skin moisture amount in the storage unit 35, and determines a skin moisture class corresponding to the detected skin moisture level. it can. In this case, a data table for converting the capacitance value to the corresponding skin moisture class may be stored instead of the first data table stored in the storage unit 35 or together with the first data table.

  The skin moisture class is expressed by classifying the skin moisture content into a plurality of classes, for example, “moisture skin” when the skin moisture content is large, “dry skin” when the skin moisture content is small, If the skin moisture is intermediate, it is classified as “normal skin”.

  The signal processing unit 34 preferably extracts, from the first data table, the skin moisture amount corresponding to the capacitance value at that time when the capacitance value is saturated with respect to the change in pressure (distortion amount). Thereby, it can be set as the structure which obtains the detected value of skin moisture content.

  In addition, the signal processing unit 34 can acquire physical information such as how the skin is rough and soft from the change tendency of the capacitance value according to the pressure (distortion amount). The changing tendency of the capacitance value according to the pressure varies depending on the skin condition. For example, in the case of a hard skin state, due to poor contact between the skin and the capacitive sensor 11, the capacitive coupling between the capacitive sensor 11 and the skin is incomplete while the pressure (distortion amount) is low. Therefore, it is known that the capacitance value is lower than that in the case of a soft skin state. Therefore, the information regarding the softness of the skin can be acquired by acquiring the change tendency of the capacitance value according to the pressure (distortion amount). A reference for acquiring what kind of skin condition indicates what behavior of the change in the capacitance value according to the pressure (amount of strain) can be stored in the storage unit 35 in advance. . The signal processing unit 34 can acquire physical information on the skin other than the skin moisture content based on the reference stored in the storage unit 35.

  As the reference stored in the storage unit 35, the inclination of the measurement data, so that the skin state other than the skin moisture amount can be acquired from the behavior of the change of the capacitance value with respect to the change of the pressure value (strain amount), A combination of a pressure value (strain amount) when the capacitance value becomes saturated and a saturated capacitance value (skin moisture amount) can be used.

  The display unit 36 is various display means such as a liquid crystal screen. The signal processing unit 34 can process the data acquired from the obtained measurement data as display data and display it on the display unit 36.

  The communication unit 37 is means for performing data communication with an external device. The signal processing unit 34 can output the obtained measurement data to an external device via the communication unit 37. For example, a smartphone or the like can be used as an external device, and the signal processing unit 34 transmits the obtained measurement data to the smartphone via the communication unit 37. A smartphone can also manage the daily skin condition by managing transmitted data with an application or the like.

  FIG. 5 is a diagram showing an example of measurement data, and FIG. 6 is a diagram showing the results of measuring different skin conditions. Here, the measurement result in the skin condition measuring apparatus 1 of this embodiment is demonstrated.

  In FIG. 5, (a) is the measurement data acquired in the structure which has arrange | positioned the strain gauge sensor in the surface of the back side of an electrostatic capacitance type sensor, (b) is the same surface as an electrostatic capacitance type sensor. It is the measurement data acquired in the arranged configuration. The measurement data refers to the pressure (strain amount) data extracted from the second data table using the resistance value for each time, and the extracted pressure (strain amount) data is used to measure the measured static electricity for each time. This corresponds to the capacitance value.

  In the measurement data shown in FIG. 5A, the capacitance value increases as the amount of distortion increases in the negative direction. An increase in the strain amount in the negative direction indicates that a compressive stress is applied to the strain gauge sensor 12 of the sensor unit 10 (the compressive stress is increasing). In this example, the strain gauge sensor 12 is provided on the back surface of the surface on which the capacitance type sensor 11 is provided with respect to the holding member 13 (the same configuration as FIG. 3). When measuring the skin condition, the skin is pressed from the surface of the holding member 13 on which the capacitive sensor 11 is provided, so that a compressive stress is applied to the strain gauge sensor 12 provided on the back surface.

  In the measurement data shown in FIG. 5B, the capacitance value increases as the strain amount increases in the positive direction. The increase in the amount of strain in the positive direction indicates that a tensile stress is applied to the strain gauge sensor 12 of the sensor unit 10 (the tensile stress is increasing). In this example, the strain gauge sensor 12 is provided on the same surface as the surface on which the capacitive sensor 11 is provided with respect to the holding member 13 (the same configuration as FIG. 1). When measuring the skin condition, the skin is pressed from the surface of the holding member 13 on which the capacitive sensor 11 is provided, so that the strain gauge sensor 12 provided on the same surface is subjected to tensile stress. .

  In common with the two measurement data of FIGS. 5A and 5B, the capacitance value increases as the absolute value (strain amount) of the stress measured through the strain gauge sensor 12 increases. It is shown that the capacitance value is saturated at a certain value. The signal processing unit 34 of the skin condition measuring apparatus 1 of the present embodiment can extract the moisture content of the skin from the saturated capacitance value shown in FIG. 5 using the first data table. Even when the capacitance value is not saturated, the skin moisture class can be extracted using the data table for conversion to the skin moisture class.

  FIG. 6 is a diagram showing the results of measuring different skin conditions. In FIG. 6, data indicated by black circles is measurement data of skin (sample a) having a high skin moisture amount and not rough, and data indicated by white circles is skin (sample) having low skin moisture amount and roughness. It is the measurement data of b). The measurement data shown in FIG. 6 is measured by a skin condition measuring apparatus having the same configuration as that in FIG. 1, and the capacitance value increases as the strain amount increases (increases in tensile stress). .

  In sample a and sample b, the saturation value of the capacitance value of sample a shows a higher value, and sample a shows a higher skin moisture content (skin moisture class) than sample b. It can be said that.

  When the skin surface is rough, the capacitance value does not reach saturation unless the skin is pressed strongly against the sensor unit. The storage unit 35 can store the amount of distortion when the capacitance value is saturated as a reference for a rough skin state or a rough skin class. For example, if the amount of distortion when the capacitance value is saturated is 35 [arbitrary units] or less, the skin is not rough, and the amount of distortion when the capacitance value is saturated is 35 [arbitrary units]. ] If the range is larger than that, it is possible to store a rough skin condition or a rough skin standard of “rough skin”. Based on this standard, in the measurement data of FIG. 6, since the capacitance value of the sample a is saturated with a strain amount lower than 35 [arbitrary units], a rough skin class “smooth skin” can be obtained. In sample b, since the capacitance value is saturated with a strain amount larger than 35 [arbitrary unit], a rough skin class of “rough skin” can be acquired. This result is consistent with the facts.

  As described above, according to the skin condition measuring apparatus of the present embodiment, physical information regarding a plurality of skins including skin moisture content is acquired by measuring the pressing force on the skin of the capacitive sensor with a simple configuration. be able to.

  In the above embodiment, the case where the sensor unit 10 is connected to the main body unit 30 via the connector unit 20 has been described as an example. However, the connector unit 20 is not an essential configuration, and the sensor unit 10 and the main unit unit are not required. 30 may be connected without the connector part 20 being interposed. In this case, for example, the sensors 11 and 12 of the sensor unit 10 and the power source and electronic circuit part of the main body unit 30 may be provided on the same flexible substrate and directly connected. Furthermore, you may provide the case which covers the power supply and electronic circuit part of the main-body part 30. FIG.

DESCRIPTION OF SYMBOLS 10 Sensor part 11 Capacitance type sensor 12 Strain gauge sensor 13 Holding member 20 Connector part 30 Main body part 31 1st signal conversion part 32 2nd signal conversion part 33 Power supply 34 Signal processing part 35 Storage part 36 Display part 37 Communication Part

Claims (7)

A flexible sensor holding unit that generates a deflection amount according to pressure when the skin to be measured is pressed;
A first electrode portion provided on the sensor holding portion and capacitively coupled to the pressed skin;
A second electrode portion provided in the sensor holding portion, the resistance value of which changes according to the amount of deflection of the sensor holding portion;
Measuring means connected to the sensor holding part, for obtaining a capacitance value and a pressure value when the skin is pressed by controlling a voltage applied to the first electrode part and the second electrode part. When,
A skin condition measuring device comprising: information acquisition means for acquiring physical information of skin based on measurement data that is a combination of the acquired capacitance value and pressure value with time.   The information acquisition unit acquires a skin moisture amount based on the capacitance value when saturated, and acquires a rough skin state according to a change behavior of the capacitance value with respect to a change in the pressure value. The skin condition measuring device according to claim 1 characterized by things.   The information acquisition means acquires a skin moisture class based on the maximum value of the capacitance value, and acquires a rough skin state according to the behavior of the change in the capacitance value with respect to the change in the pressure value. The skin condition measuring apparatus according to claim 1, wherein: A flexible sensor holding unit that generates a deflection amount according to pressure when the skin to be measured is pressed;
A first electrode portion provided on the sensor holding portion and capacitively coupled to the pressed skin;
A second electrode portion provided in the sensor holding portion, the resistance value of which changes according to the amount of deflection of the sensor holding portion;
Measuring means connected to the sensor holding part, for controlling the voltage applied to the first electrode part and the second electrode part to obtain a capacitance value and a deflection amount when pressing the skin. When,
A skin condition measuring apparatus comprising: information acquisition means for acquiring physical information of skin based on measurement data that is a combination of the acquired capacitance value and the amount of deflection over time.   The information acquisition unit acquires a skin moisture amount based on the capacitance value when saturated, and acquires a rough skin state according to a change behavior of the capacitance value with respect to a change in the deflection amount. The skin condition measuring device according to claim 3 characterized by things.   The information acquisition means acquires a skin moisture class based on the maximum value of the capacitance value, and acquires a rough skin state according to the behavior of the change in the capacitance value with respect to the change in the deflection amount. The skin condition measuring device according to claim 3 characterized by things.   The skin condition measuring device according to any one of claims 1 to 6, further comprising a case for housing the measuring unit and the information acquiring unit, wherein the sensor holding unit is detachably attached to the case. .

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