Measurement device, method for measurement, controller, method, and program

Abstract

To provide a measurement device for stably measuring the surface state of a skin related to the sense of touch.SOLUTION: A measurement device includes: a contact element in contact with a measurement target; a sensor for measuring the surface state of the measurement target set in the contact element; a driving unit for displacing the contact element and the sensor relative to the measurement target; and a vibration separation member located between the driving unit and the contact element and the sensor, the vibration separation member separating vibrations from the driving unit to the contact element and the sensor. The measurement device measures the surface state on the basis of the measured value of the sensor.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a measuring device and a measuring method.

Background Art

[0002] One of the important elements of cosmetics is the sensory value. The sensory value of cosmetics is the value that acts on the user's senses when using the cosmetics. For example, if using cosmetics makes the skin feel better and the user can obtain a sense of satisfaction, the sensory value of the cosmetics is considered high.

[0003] In order to add sensory value to cosmetics, it is necessary to realize a "good touch feeling" based on ergonomics. For this purpose, it is necessary to accurately measure the surface state of the skin due to differences in users (age and habits) and the surrounding environment (time and place).

[0004] Conventionally, the measurement of the skin condition has been performed by palpation. Also, a device for quantitatively evaluating the touch feeling has been known (Patent Document 1).

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, since the measurement by palpation is a subjective judgment, it has not been possible to stably measure the surface state of the skin. The conventional tactile evaluation device is large in size and it has been difficult to easily measure human skin.

[0007] An embodiment of the present invention aims to provide a measuring device that can stably measure the surface state of the skin related to the touch feeling in view of the above circumstances.

Means for Solving the Problem

[0008] The disclosed measuring device includes a contactor that contacts a measurement object, a sensor that measures at least the surface state of the measurement object installed on the contactor, a drive unit that displaces the contactor and the sensor with respect to the measurement object, and a vibration isolation member provided between the drive unit and the contactor and the sensor for isolating vibration from the drive unit to the contactor and the sensor, and measures the surface state based on the measurement value of the sensor.

Effect of the Invention

[0009] A measuring device capable of stably measuring the surface state of the skin related to the sense of touch can be provided.

Brief Description of the Drawings

[0010]

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Embodiments for Carrying Out the Invention

[0011] Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In this specification and the drawings, components having substantially the same functional configuration are denoted by the same reference numerals, and duplicate explanations are omitted.

[0012] <<First Embodiment>> <Measuring Device 1> The first embodiment will be described. FIG. 1 is an overall configuration diagram of an example of the measuring device according to this embodiment.

[0013] The measuring device 1 according to this embodiment includes a detection unit 100 and a control device 200. The detection unit 100 and the control device 200 are connected by a cable or the like. As will be described in detail below, the measuring device 1 according to this embodiment measures the surface state of the skin related to the sense of touch, for example, whether the surface of the skin is smooth or the like.

[0014] <Detection Unit 100> First, the detection unit 100 will be described.

[0015] FIG. 2 is a side view of the detection unit 100 of an example of the measuring device according to this embodiment. FIG. 3 is a perspective view of the detection unit 100 of an example of the measuring device according to this embodiment.

[0016] The detection unit 100 of the measurement device 1 according to this embodiment includes a main body unit 110 and a tip unit 120. The detection unit 100 measures the surface state of the skin by pressing the tip unit 120 against a measurement object, for example, the skin of a person's arm or cheek, in the direction of arrow P. The tip unit 120 rotates in the direction of arrow R around the rotation axis A.

[0017] The main body unit 110 includes a substantially cylindrical housing 111. The main body unit 110 includes a drive unit 170 inside the housing 111 for rotating the tip unit 120. That is, the main body unit 110 includes the housing 111 with the drive unit 170 built therein. The housing 111 has a shape and size that can be grasped by the measurer. The measurer performs the measurement by grasping the main body unit 110. The measurer presses the tip unit 120 against the measurement object by grasping the main body unit 110 and moving it toward the measurement object. Note that the main body unit 110 may be attached to, for example, a robotic arm to perform the measurement.

[0018] The main body unit 110 and the tip unit 120 are connected by a connecting shaft 130 that is rotated by the drive unit 170. In this way, the main body unit 110 is connected to the tip unit 120 via the connecting shaft 130. Note that the connecting shaft 130 is an example of a connecting member.

[0019] The tip unit 120 includes a contact 140 and a sensor 150.

[0020] The contact 140 is a member that contacts the measurement object of the measurement device 1. The contact surface 141 of the contact 140 contacts the measurement object. The contact surface 141 of the contact 140 may be flat or may have irregularities on the surface, depending on the measurement object and the purpose of the measurement.

[0021] When the contact 140 comes into contact with the object to be measured and the tip 120 rotates in the direction of arrow R, vibration is generated. For example, when the surface roughness of the object to be measured is large, the vibration becomes large. Also, when the surface roughness of the object to be measured is small, the vibration becomes small. The material of the contact 140 is a metal such as stainless steel, copper, or brass. By making the material of the contact 140 a metal, the generated vibration in a wide frequency band, particularly in a high frequency band, can be transmitted to the sensor 150. Note that the material of the contact 140 can be an elastic body such as rubber. By making the material of the contact 140 an elastic body, for example, the vibration propagated through a finger can be simulated.

[0022] The sensor 150 is a sensor that measures the surface state of the object to be measured. The sensor 150 of the present embodiment is a vibration sensor. The sensor 150 is installed on the surface (back surface 142; see FIG. 5C) opposite to the contact surface 141 of the contact 140. As the vibration sensor, for example, a three-axis acceleration sensor is used. The sensor 150 detects the vibration generated when the tip 120 rotates and the contact 140 comes into contact with the object to be measured and is displaced. The sensor 150 is connected to the control device 200 by a cable or the like. The control device 200 detects the signal from the sensor 150 and acquires the measurement value.

[0023] The structure of the tip 120 will be described. FIG. 4 is a diagram for explaining the structure of the tip 120 of an example of the measuring device according to the present embodiment. FIG. 4 is a diagram in which the members constituting the tip 120 are disassembled and arranged in the direction of the rotation axis A.

[0024] The tip 120 is rotated by the drive unit 170. Since the drive unit 170 is constituted by a motor as will be described later, vibration is generated. When such vibration is detected by the vibration sensor, an error occurs in the measurement result. In order to prevent the occurrence of such an error, the tip 120 of the present embodiment isolates the vibration from the main body 110, particularly the vibration generated by the drive unit 170, so as not to propagate it to the sensor 150 provided in the tip 120.

[0025] The tip 120 of this embodiment includes, in order from the main body 110 side, a lower support member 121, a lower vibration absorption member 122, an intermediate support member 123, an upper vibration absorption member 124, and an upper support member 125. The lower support member 121, the intermediate support member 123, and the upper support member 125 are formed of a resin such as polyacetal, for example. The lower vibration absorption member 122 and the upper vibration absorption member 124 are formed of members that absorb vibration. Examples of the member that absorbs vibration include sponge such as urethane foam and rubber. By providing the lower vibration absorption member 122 and the upper vibration absorption member 124 between the drive unit 170 and the sensor 150 and absorbing vibration, vibration from the drive unit 170 to the contact 140 and the sensor 150 is isolated. The lower vibration absorption member 122 and the upper vibration absorption member 124 are an example of a vibration isolation member.

[0026] Each of the lower support member 121, the lower vibration absorption member 122, the intermediate support member 123, the upper vibration absorption member 124, and the upper support member 125 is fixed to an adjacent member with an adhesive or the like. By being fixed in this way, rotation from the connecting shaft 130 can be transmitted from the lower support member 121 to the upper support member 125.

[0027] The lower support member 121 is rotated by the drive unit 170 of the main body 110 by being connected to the connecting shaft 130. Thereby, when the connecting shaft 130 is rotated by the drive unit 170, the tip 120 rotates. The lower support member 121 includes a rod-shaped member 1211. The rod-shaped member 1211 passes through the respective openings 1221, 1231, 1241, and 1251 of the lower vibration absorption member 122, the intermediate support member 123, the upper vibration absorption member 124, and the upper support member 125, and the tip of the rod-shaped member 1211 is exposed on the measurement target side. By bringing the rod-shaped member 1211 into contact with the measurement target, positioning can be performed when the detection unit 100 is pressed against the measurement target. Note that the rod-shaped member 1211 of the lower support member 121 is provided so as to be separated from the intermediate support member 123 and the upper support member 125 so as not to contact them. Thereby, vibration from the main body 110 is prevented from being transmitted to the intermediate support member 123 and the upper support member 125.

[0028] The lower vibration absorbing member 122 is provided between the lower support member 121 and the intermediate support member 123. The lower vibration absorbing member 122 transmits the rotation from the lower support member 121 to the intermediate support member 123, and absorbs the vibration transmitted from the lower support member 121, particularly the vibration from the drive unit 170, so that the vibration is not transmitted to the intermediate support member 123.

[0029] The intermediate support member 123 is provided between the lower vibration absorbing member 122 and the upper vibration absorbing member 124. The intermediate support member 123 includes a flat plate portion 1232 which is a disk-shaped flat plate having an opening 1231, and a cylindrical portion 1233 coupled to the surface of the flat plate portion 1232 on the lower support member 121 side. Inside the cylindrical portion 1233 of the intermediate support member 123, the lower vibration absorbing member 122 is installed so as to contact the surface of the flat plate portion 1232 on the cylindrical portion 1233 side. The intermediate support member 123 transmits the rotation from the lower vibration absorbing member 122 to the upper vibration absorbing member 124.

[0030] The upper vibration absorbing member 124 is provided between the intermediate support member 123 and the upper support member 125. The upper vibration absorbing member 124 transmits the rotation from the intermediate support member 123 to the upper support member 125, and absorbs the vibration transmitted from the intermediate support member 123, particularly the vibration generated by the drive unit 170, so that the vibration is not transmitted to the upper support member 125. Note that, when viewed from the main body portion 110, the portion beyond the vibration isolation members (the lower vibration absorbing member 122 and the upper vibration absorbing member 124) is referred to as the leading portion. In the present embodiment, the upper support member 125, the contact 140, and the sensor 150 are the leading portion 160.

[0031] The upper support member 125 is a member that supports the contact 140 and the sensor 150. FIGS. 5A to 5D are diagrams for explaining the upper support member 125 of an example of the measuring device according to the present embodiment. FIG. 5A is a top view of the upper support member 125, FIG. 5B is a front view of the upper support member 125, FIG. 5C is a right side view of the upper support member 125, and FIG. 5D is a perspective view of the upper support member 125.

[0032] The upper support member 125 includes a disc-shaped bottom portion 1252 with a diameter ranging from 10 mm to 50 mm. For example, the bottom portion 1252 in this embodiment is a disc with a diameter of 30 mm. Note that the diameter of the bottom portion 1252 is not limited to the above range and can be appropriately determined according to the size of the measurement object. Also, the shape of the bottom portion 1252 in plan view is not limited to a circle and can also be a polygon. The bottom portion 1252 has an opening 1251 at the center. On the upper surface of the bottom portion 1252, contact support members 1253 and 1254 are provided. The contact support members 1253 and 1254 are plate-shaped members formed vertically from the upper surface of the bottom portion 1252 arranged side by side. At the upper parts of the contact support members 1253 and 1254, contacts 140 are fixed with an adhesive or the like. A sensor 150 is fixed with an adhesive or the like to the back surface 142 facing the contact surface 141 of the contact 140. The sensor 150 is fixed between the contact support member 1253 and the contact support member 1254. Further, a protrusion 1255 is formed at a position of the bottom portion 1252 facing the opening 1251 between the contact support members 1253 and 1254. By providing the protrusion 1255, the contact 140 can be uniformly pressed against the measurement object without tilting. Note that the upper support member 125 is an example of a support member. The protrusion 1255 is an example of a contact portion.

[0033] In the tip portion 120 of this embodiment, by providing two vibration absorption members (lower vibration absorption member 122 and upper vibration absorption member 124), the lower vibration absorption member 122 can attenuate the vibration from the main body portion 110, and further, the upper vibration absorption member 124 can attenuate the vibration. Thereby, the influence of the vibration from the main body portion 110 on the sensor 150 can be reduced. Also, by using a plurality of vibration absorption members, the thickness of each vibration absorption member can be made thinner, so that the transmission of rotation from the connecting shaft 130 to the upper support member 125 can be stably performed. Further, by changing the frequency characteristics absorbed by each vibration absorption member, vibration can be attenuated in a wide range of frequency regions.

[0034] The drive unit 170 rotates the connecting shaft 130 to rotationally displace the tip 120 with respect to the measurement target. The drive unit 170 is, for example, a motor such as a stepping motor or a DC motor. The motor may be provided with a speed reducer.

[0035] When the contact 140 and the sensor 150 are moved by hand, variations due to differences in people and time occur in the speed of moving the contact 140 and the sensor 150 due to blurring of the measurer's operation and the like. In the measuring device 1 of the present embodiment, by using the drive unit 170, the contact 140 and the sensor 150 can be moved at a desired speed. For example, in measurements over a long period (e.g., one week, one month, one year, etc.), even if the date and time or the measurer changes, the contact 140 and the sensor 150 can be moved at a determined desired speed, so that the reproducibility of the measurement can be improved.

[0036] <Control device 200> Next, the control device 200 will be described with reference back to FIG. 1.

[0037] The control device 200 includes a signal processing unit 210 and a detector control unit 220.

[0038] The signal processing unit 210 receives a signal from the sensor 150 of the detection unit 100. Then, the signal processing unit 210 performs filter processing and amplification processing on the received signal to obtain a measured value that has been analog-to-digital converted. The signal processing unit 210 measures the surface state of the skin by processing the obtained measured value. For example, the measured value is Fourier-transformed and measured using a power spectrum or the like.

[0039] The detection unit control unit 220 controls the drive unit 170 of the detection unit 100. Specifically, it controls the drive unit 170 to rotate the connecting shaft 130 back and forth between a predetermined angle. The rotation speed of the connecting shaft 130 may be set to a constant speed during a part of the reciprocating period, or may be changed sinusoidally. For example, in the case of long-term measurement (e.g., one week, one month, one year, etc.) or measurement for a large number of subjects, the speed is set to a certain reference speed, and the measurement is performed by displacing the contact 140 and the sensor 150 at the reference speed. In the measurement device 1 of the present embodiment, by using the drive unit 170, the measurement can be performed at a determined reference speed, so that the reproducibility of the measurement is improved and the variation in the measurement can be suppressed. In addition, by measuring the subject at a plurality of speeds, the characteristics of the skin with respect to the speed can be measured.

[0040] Note that the control of the drive unit 170 of the detection unit 100 by the detection unit control unit 220 is not limited to rotating back and forth between the above-mentioned predetermined angles. For example, the connecting shaft 130 may be rotated in one direction at a constant speed. Also, in that case, the speed may be changed at a plurality of speeds. Further, the speed may be gradually changed based on a predetermined setting.

[0041] Each function of the control device 200 is realized by the operation of a CPU (Central Processing Unit) according to a program stored in a storage device (not shown) in a readable manner. For example, these functions are realized by the cooperation of hardware and software in a microcomputer including a CPU.

[0042] <Detection result> FIGS. 6A to 6C are diagrams for explaining the measurement results of an example of the measurement device according to the present embodiment.

[0043] Figures 6A to 6C show the results of measuring the cheek of a subject as the measurement target. The measurement was performed by displacing the contact 140 and the sensor 150 reciprocally within a range of approximately 90°. Also, the measurement was carried out such that the speed in the rotational direction for displacing the contact 140 and the sensor 150 was substantially constant except for the folded-back portion.

[0044] Figure 6A shows the output of the sensor 150 in a state where the contact 140 is not in contact with the measurement target, that is, in an idling state. Figure 6B shows the output of the sensor 150 in a state where the contact 140 is in contact with the skin of a subject with smooth skin. Figure 6C shows the output of the sensor 150 in a state where the contact 140 is in contact with the skin of a subject with rough skin. Note that the vertical axis of the graph represents acceleration (×9.8 m / s 2 ), and the horizontal axis represents time (ms). Also, the acceleration is the output value of the acceleration in the rotational direction of the sensor 150.

[0045] The sensor 150 of the present embodiment is an acceleration sensor. In the detection unit 100 of the present embodiment, the acceleration in the rotational direction of the sensor 150 is used. In the measurement, the tip of the detection unit 100 is pressed against the cheek of the subject with respect to the substantially vertical cheek for measurement. Therefore, due to the rotation of the contact 140 and the sensor 150, the measured value repeats rising or falling within 1 second due to the influence of the gravitational acceleration. From Figure 6A, in the idling state, only the fluctuation of substantially the gravitational acceleration is measured. Comparing Figures 6B and 6C, it can be seen that in the test result of the subject with rough skin, the high-frequency vibration is larger than that of the test result of the subject with smooth skin. That is, regarding the measured value of the sensor 150, if the high-frequency vibration is large, it can be determined that the surface state of the skin is in a rough (uneven) state. Thus, by using the measuring device 1 of the present embodiment, the surface state of the skin can be measured. Note that regarding the output of the sensor 150, in addition to the acceleration in the rotational direction, the acceleration in the radial direction and the rotational axis direction may be used for measurement.

[0046] <Function and Effect> The measuring device 1 of the present embodiment can displace the contact 140 and the sensor 150 at a predetermined speed while bringing the contact 140 into contact by the driving unit 170. Therefore, for example, even if the date and time or the measurer changes, highly reproducible and stable measurement can be performed.

[0047] By providing a vibration absorbing member, the measuring device 1 of the present embodiment can block the vibration transmitted from the driving unit 170 of the main body 110 to the sensor 150. As a result, when measuring with the sensor 150, accurate measurement can be performed without being affected by the vibration from the driving unit 170 of the main body 110.

[0048] The measuring device 1 of the present embodiment is small and easy to carry, and can be measured in any environment. Further, the measuring device 1 of the present embodiment can displace the contact 140 and the sensor 150 by rotational motion, and can measure a narrow range of the measurement object (skin) while increasing the displacement distance.

[0049] Since the contact 140 of the measuring device 1 of the present embodiment is made of metal, high-frequency vibrations generated by the contact and displacement of the contact 140 with the measurement object can also be measured.

[0050] <Usage Example> The measurement method using the measuring device 1 of the present embodiment and the measurement results are shown.

[0051] (1) Skin feel evaluation The skin feel was evaluated using the measuring device 1 of the present embodiment. Specifically, correlation analysis was performed on the data obtained regarding the measurement results with the measuring device 1 of the present embodiment, the tactile evaluation by palpation by a professional evaluator, the stratum corneum moisture content evaluation by a stratum corneum moisture content measuring device, and the uniformity of the stratum corneum (evaluation of the skin texture state) by photographing the skin texture with a video microscope. The measurement was performed on 40 women aged 20 to 49 years.

[0052] Figures 7A to 7D are diagrams for explaining the results of tactile sensation evaluation as an example of the use of an example of the measuring device according to the present embodiment.

[0053] Figures 7A and 7B are correlation results between the results measured by the measuring device 1 of the present embodiment and the results of tactile sensation evaluation by palpation by a professional evaluator. Figure 7A is a correlation result between the spectral intensity of vibration at a vibration frequency of 180 Hz in the measuring device 1 and the evaluation result of the degree of roughness of the palpation evaluation by palpation. Figure 7B is a correlation result between the spectral intensity of vibration at a vibration frequency of 30 Hz in the measuring device 1 and the evaluation result of the degree of stickiness of the palpation evaluation by palpation. From the correlation results, a significant correlation is recognized between the results measured by the measuring device 1 of the present embodiment and the results of tactile sensation evaluation by palpation by a professional evaluator. Thus, by using the measuring device 1 of the present embodiment, tactile sensation evaluation of the skin can be performed.

[0054] Figure 7C is a correlation result between the spectral intensity of vibration at a vibration frequency of 30 Hz in the measuring device 1 and the evaluation result of the horny layer moisture content by a horny layer moisture content measuring device. From the correlation results, a significant correlation is recognized between the results measured by the measuring device 1 of the present embodiment and the evaluation result of the horny layer moisture content by a horny layer moisture content measuring device. Thus, by using the measuring device 1 of the present embodiment, evaluation of the horny layer moisture content can be performed.

[0055] Figure 7D is a correlation result between the spectral intensity of vibration at a vibration frequency of 140 Hz in the measuring device 1 and the uniformity of the horny layer (evaluation of the texture state) by texture photography using a video microscope. From the correlation results, a significant correlation is recognized between the results measured by the measuring device 1 of the present embodiment and the uniformity of the horny layer (evaluation of the texture state) by texture photography using a video microscope. Thus, by using the measuring device 1 of the present embodiment, evaluation of the texture state can be performed.

[0056] (2) Evaluation of the feel of using cosmetics Vibration data was acquired using the measuring device 1 when two types of lotions with different evaluations of the feel of use by professional evaluators were applied to artificial skin (manufactured by Biurax). As the evaluation of the feel of use, a refreshing feeling was adopted. Sample 1 is a sample with a high refreshing feeling, and Sample 2 is a sample with a low refreshing feeling. In addition, in order to numerically evaluate the refreshing feeling, several professional evaluators evaluated the refreshing feeling on a 7-point scale from -3 to 3, and the average value of the evaluation scores was evaluated as the refreshing score. In the evaluation results, Sample 1 had a refreshing score of 1.8, and Sample 2 had a refreshing score of -2.33.

[0057] Figures 8A to 8C are diagrams for explaining the results of evaluating the feel of use of cosmetics as an example of the use of the measuring device according to the present embodiment.

[0058] Figure 8A is the vibration waveform in the measurement of Sample 1 by the measuring device 1. Figure 8B is the vibration waveform in the measurement of Sample 2 by the measuring device 1. Figure 8C is the result of measuring the frequency spectra of Sample 1 and Sample 2 by the measuring device 1. From the evaluation results, it became clear that different vibration data can be obtained for cosmetics with different feel of use as a result of measurement with the measuring device 1 of the present embodiment. Thus, by using the measuring device 1 of the present embodiment, the feel of use of cosmetics can be evaluated.

[0059] (3) Evaluation before and after use of cosmetics Vibration data was acquired using the measuring device 1 on the inner side of the forearm of the subject before and after applying cream (cosmetics).

[0060] Figures 9A to 9C are diagrams for explaining the results of evaluating before and after use of cosmetics as an example of the use of the measuring device according to the present embodiment.

[0061] FIG. 9A is a vibration waveform in the measurement before cream application in the measuring device 1. FIG. 9B is a vibration waveform in the measurement after cream application in the measuring device 1. FIG. 9C is the result of measuring the frequency spectra before and after cream application in the measuring device 1. From the evaluation results, it became clear that different vibration data can be acquired before and after cream application as a result of measurement with the measuring device 1 of the present embodiment. Thus, by using the measuring device 1 of the present embodiment, it is possible to evaluate before and after using cosmetics.

[0062] <Modification Example> The sensor 150 is not limited to a vibration sensor. For example, a force sensor may be used as the sensor 150. As the force sensor, a three-axis force sensor may be used. By providing the sensor 150 with a force sensor, it is possible to measure the frictional force between the skin and the contact 140 when the contact 140 is displaced. Also, the sensor 150 may be provided with a vibration sensor and a force sensor.

[0063] The sensor 150 may be a wireless sensor that outputs wirelessly. By making the sensor 150 a wireless sensor, the wiring can be simplified. Also, by making the sensor 150 a wireless sensor, the entanglement of the wiring is eliminated, and the degree of freedom of rotation by the drive unit 170 can be increased (for example, rotating in one direction at a constant speed, etc.).

[0064] The measuring device 1 may be provided with a plurality of sensors 150. For example, the measuring device of the modification example may be further provided with a sensor 150 at the position of the protrusion 1255 shown in FIGS. 5A, 5B, and 5D.

[0065] The control device 200 may be built in the housing 111 of the main body 110. Thereby, the user can easily measure on a daily basis.

[0066] The contact 140 may be made replaceable. By making the contact 140 replaceable, an optimal contact can be adopted according to the measurement and the measurement object.

[0067] The contact 140 is not limited to the plate-like shape as in this embodiment. For example, it may be something like a brush. By adopting the brush as the contact 140, for example, it is possible to evaluate the skin when applying cosmetics. In addition to the brush, for example, an applicator used in cosmetics such as cotton or sponge may be used as the contact.

[0068] The structure of the tip 120 is not limited to the structure of this embodiment. For example, in order to position the contact 140 when pressing it against the measurement target, a cylindrical cover having the same height as the end portion on the measurement target side of the tip 120 may be provided around the tip 120. By pressing the cover against the skin, the positioning of the contact 140 in the pressing direction can be performed. Note that the height of the cylindrical cover may be variable according to the shape, flexibility, and surface state of the skin at the measurement site. Also, a mechanism (a head shaking mechanism) may be provided between the main body portion 110 and the tip portion 120 so that the tip portion 120 is at a certain angle so that the contact 140 contacts the measurement target at a certain angle.

[0069] The tip 120 may be provided with a sensor other than the sensor 150. For example, it may be provided with a temperature sensor. By providing a temperature sensor, the temperature of the skin that is the measurement target can be measured simultaneously. Also, it may be provided with an imaging element such as a CCD camera. By providing an imaging element, the texture of the skin and the like can be measured simultaneously.

[0070] The tip 120 may be detachable from the main body portion 110. For example, the tip 120 may be connected to the main body portion 110 of another detection unit 100, or another tip 120 may be connected to the main body portion 110.

[0071] The displacement of the tip 120 is not limited to the displacement in the rotational direction of this embodiment. For example, it may be a displacement in a linear direction by a linear reciprocating motion.

[0072] Regarding the weight of the head portion 160, it is preferably 30 g or less, more preferably 20 g or less, and particularly preferably 15 g or less. FIG. 10 is a graph showing the weight of the head portion and the damping ratio of the vibration generated between the measurement object and the head portion. In the test, the vibration was measured by directly installing the vibration sensor of the sensor 150 on the simulated skin placed on a vibration table that performs random vibration, and the ratio (vibration damping ratio) of the value obtained by measuring the vibration with the sample of the head portion 160 with different weights installed on the same simulated skin and the vibration sensor was obtained. The vibration damping ratio was obtained from the average of each vibration damping ratio in the vibration frequency range of 100 to 500 Hz. Note that the closer the vibration damping ratio is to 1, the more faithfully the vibration of the vibration table is measured without attenuation. From the results of FIG. 10, the smaller the weight of the head portion, the more accurately the vibration generated on the vibration table can be measured. Note that from FIG. 10, if it is 30 g or less, compared with the case where the sensor 150 is directly attached, approximately 40% or more of the vibration can be measured.

[0073] The measurement object is not limited to human skin. For example, it may be used for the skin of livestock such as cows and pigs. Also, not limited to human skin, the surface state of artificial leather, simulated skin, cloth, paper, hair, etc. may be measured.

[0074] In the measuring device 1 of the present embodiment, a vibration absorbing member is used as the vibration isolation member. However, the vibration isolation member is not limited to the vibration absorbing member. For example, by joining the drive unit 170 and the sensor 150 using a magnetic coupling, the vibration from the drive unit 170 to the contact 140 and the sensor 150 may be isolated. The magnetic coupling transmits force by magnetic force while providing a space between the couplings. Therefore, vibration can be isolated between the couplings.

[0075] <<Second Embodiment>> <Measuring Device 2> Next, the second embodiment will be described. FIG. 11 is an overall configuration diagram of an example of the measuring device according to the present embodiment.

[0076] The measuring device 2 according to this embodiment includes a detection unit 300 and a control device 400. The detection unit 300 and the control device 400 are communicably connected wirelessly or by wire. Similar to the measuring device 1, the measuring device 2 according to this embodiment measures the surface state of the skin related to the sense of touch, for example, whether the surface of the skin is smooth or the like.

[0077] <Detection unit 300> First, the detection unit 300 will be described.

[0078] FIG. 12 is a front view of the detection unit 300 of an example of the measuring device according to this embodiment. FIG. 13 is a side view of the detection unit 300 of an example of the measuring device according to this embodiment. FIG. 14 is a perspective view of the detection unit 300 of an example of the measuring device according to this embodiment.

[0079] The detection unit 300 of the measuring device 2 according to this embodiment includes a main body unit 310 and a tip unit 320. The tip unit 320 is built into the main body unit 310 such that the contact 340 is exposed from the opening of the pressing ring 316 (to be described later) of the main body unit 310. The detection unit 300 measures the surface state of the skin by pressing the tip unit 320 against a measurement object, for example, the skin of a person's arm or cheek, in the direction of arrow P. The tip unit 320 rotates in the direction of arrow R1 about the rotation axis A. Note that the rotation direction is not limited to the direction of arrow R1, and for example, it may rotate in the direction opposite to arrow R1, or may rotate repeatedly in the direction of arrow R1 and its opposite direction.

[0080] The main body unit 310 includes a substantially cylindrical housing 311 with a constricted central portion. The housing 311 is composed of a top cover 312, a side cover 313, a side cover 314, and a bottom cover 315. Each cover of the housing 311 is formed of an acrylonitrile-butadiene-styrene copolymer resin (ABS (Acrylonitrile Butadiene Styrene) resin) or the like.

[0081] On the upper part of the top cover 312, a cylindrical pressing ring 316 having an annular flat surface 316a at its tip is screwed. Inside the pressing ring 316, a tip portion 320 is provided so that the contact 340 of the tip portion 320 is exposed to the outside.

[0082] By pressing the flat surface 316a of the pressing ring 316 against the skin, the positioning of the measuring device 2 in the pressing direction can be performed. The distance in the direction along the rotation axis A from the flat surface 316a of the pressing ring 316 to the contact surface 341 of the contact 340 described later can be changed by changing the amount screwed onto the top cover 312. In this way, for example, according to the shape, flexibility, and surface state of the skin of the measurement site, the distance in the direction along the rotation axis A from the flat surface 316a of the pressing ring 316 to the contact surface 341 of the contact 340 can be changed. Thereby, the pressing force when the contact 340 of the tip portion 320 contacts the measurement object can be adjusted. Note that the pressing ring 316 is formed of, for example, polymethyl methacrylate resin (PMMA (Polymethyl Methacrylate)) or the like.

[0083] The main body portion 310 includes a drive portion 370 (described later) for rotating the tip portion 320 inside the housing 311. That is, the main body portion 310 includes a housing 311 incorporating the drive portion 370. The housing 311 has a shape of a size that can be grasped by the measurer. The measurer performs measurement by grasping the main body portion 310. The measurer presses the tip portion 320 against the measurement object by grasping the main body portion 310 and moving it toward the measurement object.

[0084] The contact 340 is a member that contacts the measurement object of the measuring device 2. The contact surface 341 of the contact 340 contacts the measurement object. The contact surface 341 of the contact 340 may be flat or may have irregularities on the surface depending on the measurement object and the purpose of measurement.

[0085] When the contact 340 comes into contact with the object to be measured and the tip 320 rotates about the rotation axis A in the direction of arrow R1 for example, vibration is generated. For example, when the surface roughness of the object to be measured is large, the vibration becomes large. Also, when the surface roughness of the object to be measured is small, the vibration becomes small. The material of the contact 340 is a metal such as stainless steel, copper, brass, etc. By making the material of the contact 340 a metal, the generated vibration in a wide frequency band, particularly in a high frequency band, can be transmitted to the acceleration sensor 351 described later. Note that the material of the contact 340 can be an elastic body such as rubber. By making the material of the contact 340 an elastic body, for example, the vibration propagated through a finger can be simulated.

[0086] When the contact 340 comes into contact with the object to be measured and the tip 320 rotates about the rotation axis A in the direction of arrow R1 for example, a frictional force between the skin and the contact 140 is generated when the contact 140 is displaced. The frictional force is detected by a force sensor 352 described later.

[0087] Furthermore, the structure of the detection unit 300 will be described in detail. FIG. 15 is a cross-sectional view of the detection unit 300 of an example of the measurement device according to the present embodiment. FIG. 15 is a cross-sectional view taken along line B-B of the detection unit 300 of the measurement device 2 according to the present embodiment in FIG. 13. Note that in FIG. 15, some configurations etc. are omitted for simplicity of the drawing.

[0088] The tip 320 includes a control unit case 321 and a sensor case 322.

[0089] The control unit case 321 includes a control unit lower case 321a and a control unit upper case 321b. Further, the control unit case 321 includes a control unit substrate 327 inside thereof. The control unit substrate 327 is a substrate including a circuit that wirelessly transmits a signal from the sensor 350 to the control device 400. The rotation shaft 334a of the slip ring 334 described later is connected to the control unit lower case 321a. The sensor case 322 is placed and adhered to the control unit upper case 321b via a vibration absorbing member 325. The vibration absorbing member 325 is formed of a member that absorbs vibration. Examples of the member that absorbs vibration include sponges such as urethane foam and rubber. The vibration absorbing member 325 is an example of a vibration isolation member.

[0090] Note that, as the wireless method for transmitting from the control unit substrate 327 to the control device 400, for example, a wireless method conforming to a wireless communication standard such as Wi-Fi (registered trademark), Bluetooth (registered trademark), or ZigBee (registered trademark) may be adopted.

[0091] The sensor case 322 includes a sensor lower case 322a and a sensor upper case 322b. Further, the sensor case 322 includes a sensor substrate 328 inside thereof. The sensor substrate 328 is a substrate including a circuit that detects a signal of the sensor 350 and transmits the detected signal to the control unit substrate 327. The sensor lower case 322a is adhesively fixed to the control unit upper case 321b via the vibration absorbing member 325. The sensor upper case 322b has an opening. Through the opening, the contact 340 is connected to the sensor substrate 328 via the connection member 329. And the sensor substrate 328 includes the force sensor 352 of the sensor 350 at a portion where the connection member 329 is attached to the sensor substrate 328. Further, on the back side of the sensor substrate 328 of the force sensor 352, the sensor substrate 328 includes the acceleration sensor 351 of the sensor 350. The acceleration sensor 351 is, for example, a three-axis acceleration sensor. Also, the force sensor 352 is, for example, a six-axis force sensor.

[0092] The drive unit 370 is, for example, a motor. The drive unit 370 rotates the rotary shaft 371. Note that in FIG. 15, the details inside the drive unit 370 are omitted. The drive unit 370 is attached to the side covers 313 and 314 of the housing 311 via the mounting bracket 318. Note that the drive unit 370 is attached to the mounting bracket 318 via the gel bush 318a formed of a gel material. This prevents the vibration generated in the drive unit 370 from being transmitted to the housing 311. A power supply and a control signal are supplied to the drive unit 370 from the control circuit 380.

[0093] To connect the tip 320 and the drive unit 370, the detection unit 300 includes a magnetic coupling 332 and a slip ring 334. The magnetic coupling 332 and the slip ring 334 are an example of a connecting member.

[0094] The magnetic coupling 332 is a non-contact joint using magnets. By connecting the tip 320 and the drive unit 370 non-contactly with the magnetic coupling 332, it is possible to prevent the vibration from the drive unit 370 from being transmitted to the tip 320. That is, the magnetic coupling 332 is an example of a vibration isolation member that isolates the vibration from the drive unit 370 to the tip 320. The magnetic coupling 332 includes a coupling disk 332a and a coupling disk 332b. The coupling disk 332a and the coupling disk 332b each include a magnet. Due to the magnetic force of the magnet, the coupling disk 332a and the coupling disk 332b can transmit force in a non-contact state. The coupling disk 332a is connected to the rotary shaft 371 of the drive unit 370 via the adapter 332a1. The coupling disk 332b is connected to the rotary shaft 334a of the slip ring 334 via the adapter 332b1.

[0095] The slip ring 334 is a connector that transmits power and signals from the outside to the rotating parts. In the detection unit 300 of the present embodiment, the slip ring 334 is used to supply power to the control unit board 327 and the sensor board 328 from the main body part 310 to the tip part 320. Note that in FIG. 15, the details inside the slip ring 334 are omitted. A wiring for supplying power from the control circuit 380 of the main body part 310 is connected to the slip ring 334. The power supplied from the control circuit 380 is supplied to the control unit board 327 through the slip ring 334, specifically, through the rotation axis 334a of the slip ring 334. The slip ring 334 is attached to the side covers 313 and 314 of the housing 311 via the attachment fitting 319.

[0096] Note that in the present embodiment, a magnetic coupling 332 is provided between the drive unit 370 and the slip ring 334, but the drive unit 370 and the slip ring 334 may be directly connected. Further, the drive unit 370 and the slip ring 334 may be connected via a vibration isolation member different from the magnetic coupling 332, for example, a sponge.

[0097] Here, a modified example in which the drive unit 370 and the slip ring 334 are connected via a sponge 333s which is a vibration isolation member will be described.

[0098] FIG. 16 is a cross-sectional view of the detection unit 300A which is a modified example of the measuring device according to the present embodiment. FIG. 16 corresponds to the cross-sectional view of the detection unit 300 of the measuring device 2 according to the present embodiment of FIG. 15. Note that in FIG. 16, some configurations etc. are omitted in order to simplify the figure. Also, the same components as those in FIG. 15 are denoted by the same reference numerals, and redundant explanations are omitted.

[0099] In order to connect the tip part 320 and the drive unit 370, the detection unit 300A includes a sponge coupling 333 and a slip ring 334. The sponge coupling 333 and the slip ring 334 are an example of a connecting member.

[0100] The sponge coupling 333 is a member that connects components via the sponge 333s. The sponge 333s is a sponge such as urethane foam, for example. By connecting between the tip portion 320 and the drive portion 370 via the sponge coupling 333 with the sponge 333s in between, it is possible to prevent vibrations from the drive portion 370 from being transmitted to the tip portion 320. That is, the sponge coupling 333 is an example of a vibration isolation member that isolates vibrations from the drive portion 370 to the tip portion 320. The sponge coupling 333 includes a coupling disk 333a and a coupling disk 333b. The sponge 333s is fixed between the coupling disk 333a and the coupling disk 333b. For example, each of the coupling disk 333a and the coupling disk 333b and the sponge 333s are adhered. Thereby, the coupling disk 333a and the coupling disk 333b can transmit force via the sponge 333s. The coupling disk 333a is connected to the rotation shaft 371 of the drive portion 370 via a set collar 333a1. The coupling disk 333b is connected to the rotation shaft 334a of the slip ring 334 via a set collar 333b1. The coupling disk 333a and the set collar 333a1, or the coupling disk 333b and the set collar 333b1, are fixed, for example, by screwing into screw holes formed in the set collar 333a1 or the set collar 333b1. Also, the set collar 333a1 and the rotation shaft 371, and the set collar 333b1 and the rotation shaft 334a, are fixed, for example, by pressing the rotation shaft 371 or the rotation shaft 334a with a set screw provided in a screw hole formed in the set collar 333a1 or the set collar 333b1. Note that the fixing method is not limited to screws and may be fixed with an adhesive or the like. Also, the coupling disks 333a, 333b may be directly connected to the rotation shafts 371, 334a without using the set collars 333a1, 333b1.

[0101] Note that instead of the sponge 333s of the sponge coupling 333, a member that prevents vibration transmission such as rubber or gel may be used.

[0102] <Control device 400> Next, the control device 400 will be described with reference back to FIG. 11.

[0103] The control device 400 includes a signal processing unit 410 and a detection unit control unit 420.

[0104] The signal processing unit 410 receives a signal from the sensor 350 of the detection unit 300. The signal processing unit 410 of the present embodiment wirelessly receives the signal from the sensor 350 via the control unit substrate 327. The signal processing unit 410 performs filter processing and amplification processing on the received signal, and acquires a measured value obtained by analog-digital conversion. The signal processing unit 410 measures the surface state of the skin by processing the acquired measured value. For example, the measured value is subjected to Fourier transform and measured by a power spectrum or the like.

[0105] The detection unit control unit 420 controls the drive unit 370 of the detection unit 300. The control performed by the detection unit control unit 420 is the same as that of the detection unit control unit 220 in the first embodiment.

[0106] <<Third Embodiment>> Next, the third embodiment will be described. In the third embodiment, a detection unit 500 suitable for attachment to a robotic arm or the like is shown.

[0107] <Measurement device 3> FIG. 17 is an overall configuration diagram of an example of the measurement device according to the present embodiment. The measurement device 3 according to the present embodiment includes a detection unit 500 and a control device 600. The detection unit 500 includes sensors 550 (acceleration sensor 551 and force sensor 552). The detection unit 500 and the control device 600 are communicably connected wirelessly. Similar to the measurement device 1, the measurement device 3 according to the present embodiment measures the surface state of the skin related to the sense of touch, for example, whether the surface of the skin is smooth or the like.

[0108] <Detection unit 500> First, the detection unit 500 will be described. As a driving unit for displacing the measurement target, a robot arm or the like outside the detection unit 500 is used. Therefore, the detection unit 500 does not need to include the driving unit that the detection units of the first embodiment and the second embodiment include. Therefore, the detection unit 500 of the present embodiment will be described limited to the configuration necessary for the sensor 550 that detects vibration and force.

[0109] FIG. 18 is a perspective view of the detection unit 500 of an example of the measurement device according to the third embodiment. FIG. 19 is a cross-sectional view of the detection unit 500 of an example of the measurement device according to the present embodiment. In FIG. 19, some configurations and the like are omitted for simplicity of the drawing.

[0110] The detection unit 500 of the measurement device 2 according to the present embodiment includes a tip portion 520 and an arm attachment jig 515. The detection unit 500 attached to a robot arm or the like measures the surface state of the skin by pressing the tip portion 520 against the measurement target, for example, the skin of a person's arm or cheek, in the direction of arrow P.

[0111] The tip portion 520 includes a control unit case 521 and a sensor case 522.

[0112] The control unit case 521 includes a control unit lower case 521a and a control unit upper case 521b. Further, the control unit case 521 includes a control unit substrate 527 inside. The control unit substrate 527 is a substrate including a circuit that wirelessly transmits signals from the acceleration sensor 551 and the force sensor 552 (sensor 550) to the control device 600. The wireless method is the same as that of the control unit substrate 327 of the second embodiment. The arm attachment jig 515 is attached to the control unit lower case 521a. The sensor case 522 is placed and adhered to the control unit upper case 521b via a vibration absorption member 525. The vibration absorption member 525 is formed of a member that absorbs vibration. Examples of the member that absorbs vibration include sponges such as urethane foam and rubber. The vibration absorption member 525 is an example of a vibration isolation member.

[0113] The sensor case 522 includes a sensor lower case 522a and a sensor upper case 522b. Further, the sensor case 522 includes a sensor substrate 528 inside thereof. The sensor substrate 528 is a substrate including a circuit that detects a signal from the sensor 550 and transmits the detected signal to the control unit substrate 527. The sensor lower case 522a is adhesively fixed to the control unit upper case 521b via a vibration absorbing member 525. The sensor upper case 522b has an opening. Through the opening, a contact 540 is connected to the sensor substrate 528 via a connection member 529. And at a portion where the connection member 529 is attached to the sensor substrate 528, the sensor substrate 528 includes a force sensor 552 of the sensor 550. Further, on the back side of the sensor substrate 528 of the force sensor 552, the sensor substrate 528 includes an acceleration sensor 551 of the sensor 550. The acceleration sensor 551 is, for example, a three-axis acceleration sensor. Also, the force sensor 352 is, for example, a six-axis force sensor.

[0114] <Control device 600> Next, the control device 600 will be described with reference back to FIG. 17.

[0115] The control device 600 includes a signal processing unit 610.

[0116] The signal processing unit 610 receives a signal from the sensor 550 of the detection unit 500. The signal processing unit 610 of the present embodiment wirelessly receives a signal from the sensor 550 via the control unit substrate 527. The signal processing unit 610 performs filter processing and amplification processing on the received signal, and obtains a measurement value that has been subjected to analog-to-digital conversion. The signal processing unit 610 measures the surface state of the skin by processing the obtained measurement value. For example, the measurement value is subjected to Fourier transform and measured by a power spectrum or the like.

[0117] <<Fourth Embodiment>> Next, the fourth embodiment will be described. In the fourth embodiment, a modified example of the detection unit 300 of the second embodiment is shown. Note that the detection unit 700 of the following fourth embodiment is used in combination with the control device 400.

[0118] <Detection unit 700> As a modification of the detection unit 300, the detection unit 700 will be described. For the components that are the same as those of the detection unit 300, the same reference numerals will be given and the description will be omitted. The detection unit 700 includes a gripping portion that extends in a direction perpendicular to the direction in which it is pressed against the measurement object. FIG. 20 is a perspective view of the detection unit 700 of an example of the measurement device according to the present embodiment. FIG. 21 is an internal configuration diagram of the detection unit 700 of an example of the measurement device according to the present embodiment. Specifically, FIG. 21 is a view showing a state in which the front half of the housing 711 of the detection unit 700 is removed to expose the inside. The detection unit 700 further includes, inside the housing 711, a circuit board (not shown), for example, a power supply board or a drive board for driving the drive unit 770, etc.

[0119] The detection unit 700 includes a main body portion 710 and a tip portion 320. The tip portion 320 is built into the main body portion 710 such that the contact 340 is exposed from the opening of the pressing ring 716 of the main body portion 710. The detection unit 700 measures the surface state of the skin by pressing the tip portion 320 against the measurement object, for example, the skin of a person's arm or cheek, in the direction of arrow P1. The tip portion 320 rotates in the direction of arrow R2 about the rotation axis C. Note that the rotation direction is not limited to the direction of arrow R2, and for example, it may rotate in the direction opposite to arrow R2, or may rotate repeatedly in the direction of arrow R2 and its opposite direction.

[0120] The main body portion 710 includes a housing 711 having an L-shaped shape in side view. The housing 711 includes a gripping portion 712 that extends in a direction perpendicular to the direction in which it is pressed against the measurement object (the direction of arrow P1), and a pressing portion 713 that extends in the direction in which it is pressed against the measurement object (the direction of arrow P1). The housing 711 is formed of ABS resin or the like.

[0121] The end portion 713b on the side that presses against the measurement target of the pressing portion 713 has a male thread formed on its outer side surface. A cylindrical pressing ring 716 is screwed onto the end portion 713b. The tip portion 320 is provided inside the pressing ring 716 so that the contact 340 of the tip portion 320 is exposed to the outside.

[0122] By pressing the end face 716a of the pressing ring 716 against the skin, the positioning in the pressing direction of the measuring device can be performed. The distance in the direction along the rotation axis C from the end face 716a of the pressing ring 716 to the contact surface of the contact 340 can be changed by changing the amount screwed onto the end portion 713b. Also, the pressing force when the contact 340 of the tip portion 320 contacts the measurement target can be adjusted. Note that the pressing ring 816 is formed of, for example, polymethyl methacrylate resin (PMMA) or the like.

[0123] The main body portion 710 includes a drive portion 770 for rotating the tip portion 320 inside the pressing portion 713. That is, the main body portion 710 includes a housing 711 that houses the drive portion 770. The measurer performs measurement by gripping the gripping portion 712. The measurer presses the tip portion 320 against the measurement target by gripping the gripping portion 712 and moving it toward the measurement target. In the detection portion 700, a smaller motor is used as the drive portion 770. By using a smaller motor, the overall size of the detection portion 700 can be reduced.

[0124] The detection portion 700 includes a sponge coupling 733 and a slip ring 334 in order to connect the tip portion 320 and the drive portion 770. The sponge coupling 733 and the slip ring 334 are an example of a connecting member.

[0125] The sponge coupling 733 is a member that connects components via the sponge 733s. The sponge 733s is a sponge such as urethane foam, for example. By connecting between the tip portion 320 and the drive portion 770 via the sponge coupling 733 with the sponge 733s in between, vibration from the drive portion 770 can be prevented from being transmitted to the tip portion 320. That is, the sponge coupling 733 is an example of a vibration isolation member that isolates vibration from the drive portion 770 to the tip portion 320.

[0126] The sponge coupling 733 includes a coupling disk 733a and a coupling disk 733b. The sponge 733s is fixed between the coupling disk 733a and the coupling disk 733b. For example, each of the coupling disk 733a and the coupling disk 733b and the sponge 733s are adhered to each other. Thereby, the coupling disk 733a and the coupling disk 733b can transmit force via the sponge 733s.

[0127] The coupling disk 733a is connected to the rotation axis of the drive portion 770 via the set collar 733a1. The coupling disk 733b is connected to the rotation axis of the slip ring 334 via the set collar 733b1. The coupling disk 733a and the set collar 733a1, or the coupling disk 733b and the set collar 733b1, are fixed, for example, by fastening with screws to screw holes formed in the set collar 733a1 or the set collar 733b1.

[0128] Also, the rotation axis of the set collar 733a1 and the drive unit 770, and the rotation axis of the set collar 733b1 and the slip ring 334 are fixed, for example, by pressing the rotation axis 371 or the rotation axis 334a with a set screw provided in a threaded hole formed in the set collar 733a1 or the set collar 733b1. Note that the fixing method is not limited to screws, and may be fixed with an adhesive or the like. Also, the respective rotation axes and the coupling disks 733a and 733b may be directly connected without using the set collars 733a1 and 733b.

[0129] Each of the drive unit 770 and the slip ring 334 is fixed to the housing 711 by a fixing member (not shown). Specifically, the drive unit 770 is crimped to the housing 711 with a gel bush formed of a gel material interposed therebetween. Also, the slip ring 334 has a bearing portion fixed to the housing 711 with screws via a mounting bracket.

[0130] By providing a gripping portion that extends in a direction perpendicular to the direction of pressing against the measurement object, like the detection unit 700 of the first modification, it is possible to make it easier to handle when pressing the detection unit 700 against the measurement object.

[0131] <<Fifth Embodiment>> Next, the fifth embodiment will be described. In the fifth embodiment, a modification of the detection unit 300 of the second embodiment is shown. Note that the detection unit 800 of the following fifth embodiment is used in combination with the control device 400. In the fifth embodiment, further miniaturization of the detector is achieved.

[0132] <Detection Unit 800> As a modification of the detection unit 300, the detection unit 800 will be described. For the same components as those of the detection unit 300, the same reference numerals will be given and the description thereof will be omitted. FIG. 22 is a perspective view of the detection unit 800 of an example of the measuring device according to the present embodiment. FIG. 23 is an internal configuration diagram of the detection unit 800 of an example of the measuring device according to the present embodiment. Specifically, FIG. 23 is a view showing a state in which the front half of the housing 811 of the detection unit 800 is removed to expose the inside. The detection unit 800 further includes a circuit board (not shown), for example, a power supply board, a drive board for driving the drive unit 870, etc. inside the housing 811.

[0133] The detection unit 800 includes a main body unit 810 and a tip unit 320. The tip unit 320 is built in the main body unit 810 such that the contact 340 is exposed from the opening of the pressing ring 816 of the main body unit 810. The detection unit 800 measures the surface state of the skin by pressing the tip unit 320 against a measurement object, for example, the skin of a person's arm or cheek, in the direction of arrow P2. The tip unit 320 rotates in the direction of arrow R3 about the rotation axis D. Note that the rotation direction is not limited to the direction of arrow R3, and for example, it may rotate in the direction opposite to arrow R3, or may rotate repeatedly in the direction of arrow R3 and the direction opposite thereto.

[0134] The main body unit 810 includes a housing 811. The housing 811 is formed of an ABS resin or the like. A male screw is formed on the outer side surface of the end portion 811b of the housing 811 on the side that presses against the measurement object. A cylindrical pressing ring 816 is screwed onto the end portion 811b. The tip unit 320 is provided inside the pressing ring 816 such that the contact 340 of the tip unit 320 is exposed to the outside.

[0135] By pressing the end face 816a of the pressing ring 816 against the skin, the positioning of the measuring device in the pressing direction can be performed. The distance in the direction along the rotation axis D from the end face 816a of the pressing ring 816 to the contact surface of the contactor 340 can be changed by changing the amount screwed onto the end portion 811b. Also, the pressing force when the contactor 340 at the tip 320 contacts the measurement object can be adjusted. Note that the pressing ring 816 is formed of, for example, polymethyl methacrylate resin (PMMA) or the like.

[0136] The main body portion 810 includes a drive portion 870 that rotates the tip portion 320 inside. That is, the main body portion 810 includes a housing 811 that houses the drive portion 870. The measurer performs measurement by gripping the housing 811. The measurer presses the tip portion 320 against the measurement object by gripping the housing 811 and moving it toward the measurement object.

[0137] The detection unit 800 includes a sponge coupling 833 and a slip ring 334 in order to connect the tip portion 320 and the drive portion 870. The sponge coupling 833 and the slip ring 334 are an example of a connecting member.

[0138] The sponge coupling 833 is a member that connects components via a sponge 833s. The sponge 833s is a sponge such as foamed urethane, for example. By connecting between the tip portion 320 and the drive portion 870 via the sponge coupling 833 with the sponge 833s, vibration from the drive portion 770 can be prevented from being transmitted to the tip portion 320. That is, the sponge coupling 833 is an example of a vibration isolation member that isolates vibration from the drive portion 870 to the tip portion 320.

[0139] The sponge coupling 833 includes a coupling disk 833a and a coupling disk 833b. A sponge 833s is fixed between the coupling disk 833a and the coupling disk 833b. For example, each of the coupling disk 833a and the coupling disk 833b and the sponge 833s are adhered to each other. Thereby, the coupling disk 833a and the coupling disk 833b can transmit force via the sponge 833s.

[0140] The coupling disk 833a is connected to the rotating shaft of the drive unit 870 via a set collar 833a1. The coupling disk 833b is connected to the rotating shaft of the slip ring 334 via a set collar 833b1. The coupling disk 833a and the set collar 833a1, or the coupling disk 833b and the set collar 833b1, are fixed, for example, by screwing into screw holes formed in the set collar 833a1 or the set collar 833b1.

[0141] Also, the set collar 833a1 and the rotating shaft of the drive unit 870, and the set collar 833b1 and the rotating shaft of the slip ring 334 are fixed by pressing the rotating shaft 371 or the rotating shaft 334a with set screws provided in screw holes formed in the set collar 833a1 or the set collar 833b1. Note that the fixing method is not limited to screws, and may be fixed with an adhesive or the like. Also, the coupling disks 833a and 833b may be directly connected to their respective rotating shafts without using the set collars 833a1 and 833b1.

[0142] Note that each of the drive unit 870 and the slip ring 334 is fixed to the housing 811 by fixing members (not shown).

[0143] By using the detection unit 800 of Modification 2, measurement can be performed with a smaller detection unit.

[0144] <<Sixth Embodiment>> Next, a sixth embodiment will be described. In the sixth embodiment, a modified example of the detection unit 300 of the second embodiment is shown. Note that the detection unit 900 of the following sixth embodiment is used in combination with the control device 400.

[0145] <Detection unit 900> As a modified example of the detection unit 300, the detection unit 900 will be described. Note that the same parts as those of the detection unit 300 are given the same reference numerals and the description thereof is omitted. FIG. 24 is a perspective view of the detection unit 900 of an example of the measuring device according to the present embodiment.

[0146] The detection unit 900 of the measuring device according to the present embodiment includes a main body portion 910 and a tip portion 920. The tip portion 920 is built in the main body portion 910 such that the contact 940 is exposed from the opening of the pressing ring 916 of the main body portion 910. The detection unit 300 measures the surface state of the skin by pressing the tip portion 920 against a measurement object, for example, the skin of a human arm or cheek, in the direction of arrow P3. The tip portion 920 rotates in the direction of arrow R4 about the rotation axis E. Note that the rotation direction is not limited to the direction of arrow R4, and for example, it may rotate in the direction opposite to arrow R4, or may repeat rotation in the direction of arrow R4 and the direction opposite thereto.

[0147] The main body portion 910 includes a substantially cylindrical housing 911 with a constricted central portion. The housing 911 is composed of a top cover 912, a side cover 913, a side cover 914, and a bottom cover 915. Each cover of the housing 911 is formed of an acrylonitrile-butadiene-styrene copolymer resin (ABS resin) or the like.

[0148] A cylindrical pressing ring 916 having an annular flat surface 916a at the tip is screwed to the upper portion of the top cover 912. Inside the pressing ring 916, the tip portion 920 is provided such that the contact 940 of the tip portion 920 is exposed to the outside.

[0149] By pressing the flat surface 916a of the pressing ring 916 against the skin, the positioning of the measuring device in the pressing direction can be performed. The distance in the direction along the rotation axis E from the flat surface 916a of the pressing ring 916 to the contact surface of the contact 940 can be changed by changing the amount screwed onto the top cover 912. And the distance in the direction along the rotation axis A from the flat surface 916a of the pressing ring 916 to the contact surface of the contact 940 can be changed. Also, the pressing force when the contact 940 at the tip 920 contacts the measurement object can be adjusted. Note that the pressing ring 316 is formed of, for example, polymethyl methacrylate resin (PMMA) or the like.

[0150] The pressing ring 916 has a plurality (six in this embodiment) of openings 916h on its side surface. By having the openings 916h, air can escape from the space surrounded by the measurement object and the pressing ring 916.

[0151] Regarding the inside of the housing 911 of the main body portion 910, it is the same as the inside of the housing 311 of the detection unit 300 of the second embodiment.

[0152] The contact 940 is a member that contacts the measurement object of the measuring device. The contact 940 contacts the measurement object. The surface of the contact 340 that contacts may be flat or may have irregularities on the surface, depending on the measurement object and the purpose of measurement. Below the contact 940, an acceleration sensor 351 and a force sensor 352 are provided in the same manner as in the detection unit 300.

[0153] The detection unit 900 of this embodiment further includes a contact 940a. The contact 940a is provided at a position symmetric to the contact 940 with respect to the rotation axis E. By providing the contact 940a at a position symmetric to the contact 940 with respect to the rotation axis E, the contact 940 can be brought into contact with the measurement object in a well-balanced manner. Also, by both the contact 940 and the contact 940a contacting the measurement object, the magnitude of the generated vibration can be increased.

[0154] Note that, below the contact 940a, an acceleration sensor and a force sensor may be provided in addition to the acceleration sensor 351 and the force sensor 352 below the contact 940, or they may not be provided. The number of contacts 940a is not limited to one, and two or more may be provided. Also, the position of the contact 940a is not limited to the position of the object as long as it is a position that contacts the measurement target. However, it is desirable to arrange the contacts 940 so that they contact well in balance. The contact 940a is an example of a contact portion.

[0155] <<Seventh Embodiment>> In the seventh embodiment, the signal processing performed by the control device will be described. Here, as an example, the processing performed by the control device 400 will be described using the detection unit 300A of the second embodiment.

[0156] <Estimated evaluation value> The control device 400 estimates the smoothness, softness, horny layer moisture content, and texture state of the subject's skin using the measurement results of the detection unit 300A. In addition, the control device 400 estimates the age of the subject using the measurement results of the detection unit 300A.

[0157] <Details of the evaluation test> The evaluation was conducted on a total of 59 subjects, including 31 Japanese women aged 20 to 69 and 28 foreign women living in Japan, who had given prior written consent to participate in the test. The subjects removed their makeup and washed their faces before the test, and then waited quietly in a constant temperature and humidity environment of 23°C and 45% humidity before measurement.

[0158] First, palpation was performed on the cheek area of the subject by two professional evaluators. Each professional evaluator evaluated two items: the smoothness of the skin and the softness of the skin. For the smoothness of the skin, it was evaluated on a 5-point scale as to whether the skin was "smooth" or "dry" and quantified. Also, for the softness of the skin, it was evaluated on a 5-point scale as to whether the skin was "smooth" or "rough" and quantified.

[0159] Next, after the professional evaluator conducted the evaluation, measurements were taken on the same site using the detection unit 300A. The measurements were taken by rotating the contact 340 of the detection unit 300A at a rotational angular velocity of 205 deg / s around the rotation axis A. In the measurements, the three-axis acceleration when tracing the skin was measured by the acceleration sensor 351. Also, the six-axis force when tracing the skin was measured by the force sensor.

[0160] Also, measurements were taken simultaneously using a commercially available sensor used for evaluating the skin condition. The stratum corneum moisture content was measured using Skicon-200EX (YAYOI Co., Ltd). Also, the skin texture state (a numerical representation of good or bad skin texture) was measured using a video microscope (Skin Visiom II, Shiseido Co., Ltd).

[0161] Then, a statistical model was created for each of the result measured by the detection unit 300A, the skin moisturization degree and smoothness degree by the professional evaluator, the stratum corneum moisture content and skin texture state by the sensor, and the age of the subject. Then, using the statistical model, estimations were made for each of the skin moisturization degree, skin smoothness degree, stratum corneum moisture content, skin texture state, and the age of the subject from the result measured by the detection unit 300A.

[0162] <Details of the evaluation test> Next, details of the estimation process performed by the control device 400 of the measuring device will be described.

[0163] [Measurement data] (1) Acceleration (vibration feature quantity) The signal processing unit 410 of the control device 400 acquires the three-axis acceleration data from the acceleration sensor 351 of the detection unit 300A. The signal processing unit 410 performs analysis using the acceleration component in the rotation direction of the rotating contact 340 among the three-axis acceleration data. The signal processing unit 410 performs a fast Fourier transform (FFT) on the acceleration component in the gravitational direction to calculate the amplitude spectrum. Specifically, the signal processing unit 410 performs a fast Fourier transform (FFT) on the acceleration data during the period (3512 (milliseconds) = (360 (deg) × 2) / (205 (deg / second)) × 1000) in which the contact 340 rotates twice, starting from 2 seconds after the measurement starts, and calculates the amplitude spectrum from a frequency of 0 kHz to 1000 kHz. Then, the signal processing unit 410 obtains the average value every 10 Hz for the calculated amplitude spectrum. As will be described later, the signal processing unit 410 estimates the average value of the vibration spectrum (a 100-dimensional vibration spectrum) as the vibration feature amount of each subject.

[0164] (2) Force (friction feature amount) The signal processing unit 410 of the control device 400 acquires the six-axis force data from the force sensor 352 of the detection unit 300A. The signal processing unit 410 performs analysis using the force component Fx in the rotation direction of the rotating contact 340 and the force component Fz in the pushing direction (the direction perpendicular to the contact surface 341 of the contact 340) among the six-axis force data. The signal processing unit 410 calculates the friction coefficient μ using the following formula 1 with the force component Fx in the rotation direction of the rotating contact 340 and the force component Fz in the pushing direction.

[0165] μ = Fx / Fz ··· (Formula 1) Specifically, the signal processing unit 410 calculates the friction coefficient μ for the force data during the period (3512 (milliseconds) = (360 (deg) × 2) / (205 (deg / second)) × 1000) in which the contact 340 rotates twice, starting from 2 seconds after the measurement starts. Then, the signal processing unit 410 obtains the average value of the calculated friction coefficient μ during the period in which the contact 340 rotates twice. As will be described later, the signal processing unit 410 estimates the average value of the friction coefficient μ as the friction feature amount of each subject.

[0166] [Calculation of the estimation model] The signal processing unit 410 calculates a statistical model for estimating the skin moisture level, skin smoothness, stratum corneum moisture content, skin texture, and the age of the subject from the vibration feature amount and friction feature amount obtained above.

[0167] The signal processing unit 410 constructs a statistical model using partial least squares regression. In the present embodiment, the skin moisture level, skin smoothness, stratum corneum moisture content, skin texture, and the age of the subject are each set as the target variable. Then, for each target variable, the vibration feature amount and friction feature amount calculated above or the vibration feature amount are used as the explanatory variables. Note that the statistical model when the vibration feature amount and friction feature amount are used as the explanatory variables is referred to as Model 1. Also, the statistical model when the vibration feature amount is used as the explanatory variable is referred to as Model 2.

[0168] First, each explanatory variable was standardized so that the average value was 0 and the standard deviation was 1. Next, a statistical model was constructed using partial least squares regression.

[0169] In order to determine the number of components in the statistical model of partial least squares regression, the number of components was changed, and the mean squared error (MSE) of the transparent model, the correlation coefficient between the estimated value and the observed value were examined. In the calculation in the present embodiment, the 10-fold cross-validation method was repeated 20 times, and the average of the mean squared error (MSE) and the correlation coefficient was obtained.

[0170] Regarding each target variable, FIGS. 25 to 34 are diagrams showing the calculation results of the measuring device according to the seventh embodiment. Each target variable will be described.

[0171] [Skin moisture level] Figure 25 is a diagram showing the mean squared error (MSE) when the number of components is changed with the skin moistness degree as the target variable. Figure 26 is a diagram showing the correlation coefficient when the number of components is changed with the skin moistness degree as the target variable. In the graphs of Figure 25 and Figure 26, X1 is the calculation result in Model 1, and Y1 is the calculation result in Model 2.

[0172] As shown in Figure 25, in Model 1, the mean squared error (MSE) was the smallest when the number of components was 5 (X1a in Figure 25). Also, in Model 2, the mean squared error (MSE) was the smallest when the number of components was 4 (Y1a in Figure 25).

[0173] As shown in Figure 26, in Model 1, the correlation coefficient was the largest when the number of components was 5 (X1b in Figure 26) where the mean squared error (MSE) was the smallest. Also, in Model 2, the correlation coefficient was the largest when the number of components was 4 (Y1b in Figure 26) where the mean squared error (MSE) was the smallest.

[0174] [Smoothness of the skin] Figure 27 is a diagram showing the mean squared error (MSE) when the number of components is changed with the skin smoothness degree as the target variable. Figure 27 is a diagram showing the correlation coefficient when the number of components is changed with the skin smoothness degree as the target variable. In the graphs of Figure 27 and Figure 28, X2 is the calculation result in Model 1, and Y2 is the calculation result in Model 2.

[0175] As shown in Figure 27, in Model 1, the mean squared error (MSE) was the smallest when the number of components was 2 (X2a in Figure 27). Also, in Model 2, the mean squared error (MSE) was the smallest when the number of components was 1 (Y2a in Figure 27).

[0176] As shown in Figure 28, in Model 1, the correlation coefficient was the largest when the number of components was 2 (X2b in Figure 28) where the mean squared error (MSE) was the smallest. Also, in Model 2, the correlation coefficient was the largest when the number of components was 1 (Y2b in Figure 26) where the mean squared error (MSE) was the smallest.

[0177] [Stratum corneum moisture content] Figure 29 is a diagram showing the mean squared error (MSE) when the number of components is changed with the stratum corneum moisture content as the target variable. Figure 30 is a diagram showing the correlation coefficient when the number of components is changed with the stratum corneum moisture content as the target variable. In the graphs of Figure 29 and Figure 30, X3 is the calculation result in Model 1 and Y3 is the calculation result in Model 2.

[0178] As shown in Figure 29, in Model 1, the mean squared error (MSE) was the smallest when the number of components was 3 (X3a in Figure 29). Also, in Model 2, the mean squared error (MSE) was the smallest when the number of components was 3 (Y3a in Figure 29).

[0179] As shown in Figure 30, in Model 1, the correlation coefficient was the largest when the number of components was 3 (X3b in Figure 30) where the mean squared error (MSE) was the smallest. Also, in Model 2, the correlation coefficient was the largest when the number of components was 4 (Y2c in Figure 30). Note that in Model 2, when the number of components was 3 (Y2b in Figure 30) where the mean squared error (MSE) was the smallest, the correlation coefficient was almost the same as that when the number of components was 4.

[0180] [State of texture] Figure 31 is a diagram showing the mean squared error (MSE) when the number of components is changed with the state of texture as the target variable. Figure 32 is a diagram showing the correlation coefficient when the number of components is changed with the state of texture as the target variable. In the graphs of Figure 31 and Figure 32, X4 is the calculation result in Model 1 and Y4 is the calculation result in Model 2.

[0181] As shown in Figure 31, in Model 1, the mean squared error (MSE) was the smallest when the number of components was 2 (X4a in Figure 31). Also, in Model 2, the mean squared error (MSE) was the smallest when the number of components was 2 (Y4a in Figure 31).

[0182] As shown in FIG. 32, in Model 1, the correlation coefficient was the largest when the number of components was 2 (X4b in FIG. 32) where the mean squared error (MSE) was the smallest. Also, in Model 2, the correlation coefficient was the largest when the number of components was 2 (Y4b in FIG. 32) where the mean squared error (MSE) was the smallest.

[0183] [Subject's age] FIG. 33 is a diagram showing the mean squared error (MSE) when the number of components is changed with the subject's age as the target variable. FIG. 34 is a diagram showing the correlation coefficient when the number of components is changed with age as the target variable. In the graphs of FIGS. 33 and 34, X5 is the calculation result in Model 1, and Y5 is the calculation result in Model 2.

[0184] As shown in FIG. 33, in Model 1, the mean squared error (MSE) was the smallest when the number of components was 2 (X5a in FIG. 33). Also, in Model 2, the mean squared error (MSE) was the smallest when the number of components was 2 (Y5a in FIG. 33).

[0185] As shown in FIG. 34, in Model 1, the correlation coefficient was the largest when the number of components was 2 (X5b in FIG. 34) where the mean squared error (MSE) was the smallest. Also, in Model 2, the correlation coefficient was the largest when the number of components was 2 (Y5b in FIG. 34) where the mean squared error (MSE) was the smallest.

[0186] From the above results, in Model 1 and Model 2, the correlation coefficient can be increased by obtaining the number of components at which the mean squared error (MSE) is the smallest. Therefore, in this embodiment, the statistical model in the case of the number of components at which the mean squared error (MSE) is the smallest is finally adopted.

[0187] Table 1 shows a table summarizing the number of components at which the mean squared error (MSE) is the smallest, the mean squared error (MSE), and the correlation coefficient at that number of components for each target variable and each model.

[0188]

Table 1

[0189] From the above results, when the objective variables were the skin moistness, skin smoothness, stratum corneum moisture content, skin texture, and the age of the subjects, a correlation was observed in both Model 1 and Model 2. Therefore, it was suggested that the sensory evaluation, skin condition, and age of the bare skin could be estimated by using Model 1 (the model using vibration feature amounts and friction feature amounts as explanatory variables) and Model 2 (the model using vibration feature amounts as explanatory variables). Also, for skin moistness, skin smoothness, and stratum corneum moisture content, the correlation coefficient of Model 1 (the model using vibration feature amounts and friction feature amounts as explanatory variables) was large, suggesting the superiority of using both vibration and friction.

[0190] <<Eighth Embodiment>> In the eighth embodiment, the signal processing performed by the control device will be described. Here, as an example, the processing performed by the control device 400 will be described using the detection unit 300A of the second embodiment.

[0191] The tactile evaluation of two types of lotions with different tactile sensations was conducted. One was a refreshing type of lotion, and the other was a moist type of lotion. The application site was the cheek of the face, and it was applied with cotton. The measurement was performed three times. It was before applying on the bare skin, 1 minute after application, and 2 minutes after application.

[0192] The friction coefficient of both lotions increased 1 minute after application. The friction coefficient of the refreshing lotion decreased 2 minutes after application, while the friction coefficient of the moist lotion increased.

[0193] The vibration of the moist lotion decreased 1 minute after application, and the vibration of the refreshing lotion was equivalent to that of the bare skin. The vibration of the moist lotion increased 2 minutes after application compared to 1 minute later, but was lower than the vibration of the bare skin. The vibration of the refreshing lotion remained unchanged 2 minutes after application and was equivalent to that of the bare skin.

[0194] As shown in FIGS. 35 and 36, it was possible to measure different vibration and friction behaviors with two types of lotions. When evaluating an object whose tactile sensation changes over time, such as a lotion, it is difficult to reproduce the same conditions. Since this measuring device can measure vibration and friction simultaneously, it is very useful for evaluating an object whose tactile sensation changes.

[0195] It should be considered that all the embodiments disclosed this time are illustrative in all respects and not restrictive. The above embodiments may be omitted, substituted, or changed in various forms without departing from the scope and gist of the appended claims.

[0196] This application claims the priority of the basic patent application No. 2019-106429 filed with the Japan Patent Office on June 6, 2019, and the basic patent application No. 2019-196477 filed with the Japan Patent Office on October 29, 2019, and incorporates the entire contents thereof by reference herein.

Description of Reference Numerals

[0197] 1 Measuring device 2 Measuring device 3 Measuring device 100 Detection unit 110 Main body unit 111 Housing 120 Tip portion 122 Lower vibration absorbing member 124 Upper vibration absorbing member 125 Upper support member 130 Connecting shaft 140 Contact 150 Sensor 170 Driving unit 200 Control device 210 Signal processing unit 300 Detection unit 310 Main body unit 311 Housing 320 Tip portion 325 Vibration absorbing member 332 Magnetic coupling 333 Sponge coupling 334 Slip ring 340 Contact 350 Sensor 370 Driving unit 400 Control device 410 Signal processing unit 500 Detection unit 520 Tip 525 Vibration absorption member 540 Contact 550 Sensor 600 Control device 610 Signal processing unit 700 Detection unit 800 Detection unit 900 Detection unit

Claims

1. A contactor that comes into contact with the object to be measured; a sensor that is disposed on the contact and that measures at least a surface condition of the measurement target; a drive unit that displaces the contact and the sensor relative to the measurement object; a vibration isolation member provided between the driving unit and the contact and the sensor to isolate vibration from the driving unit to the contact and the sensor; Equipped with A measuring device that measures the surface condition based on the measurement value of the sensor.

2. The sensor comprises a vibration sensor.

2. The measuring device of claim 1.

3. The sensor comprises a force sensor. The measuring device according to claim 1 or 2.

4. Further comprising a temperature sensor The measuring device according to any one of claims 1 to 3.

5. The vibration isolation member is a vibration absorbing member. The measuring device according to any one of claims 1 to 4.

6. The sensor further includes a signal processor for processing a signal from the sensor. The measuring device according to any one of claims 1 to 5.

7. a tip portion including the contact and the sensor; A connecting member that connects the tip portion and the drive portion; A main body portion including a housing that houses the driving unit, The main body is moved toward the measurement object, and the tip is pressed against the measurement object. The surface condition is measured based on the measurement value detected by the sensor while the tip portion pressed against the surface by the driving portion is displaced. The measuring device according to any one of claims 1 to 6.

8. The driving unit rotates and displaces the contact and the sensor relative to the measurement object. The measuring device according to any one of claims 1 to 7.

9. a contact portion that contacts the object to be measured at a position different from that of the contact piece; The measuring device according to any one of claims 1 to 8.

10. A method for measuring a skin surface condition using the measurement device according to any one of claims 1 to 9.

11. Measuring the skin to which the cosmetic has been applied The measurement method according to claim 10.

Images