JP6968671B2 - Evaluation method for human skin or cosmetics - Google Patents

Description

The present invention relates to a technique for evaluating a state such as tactile sensation and properties of human skin or a surface created by imitating human skin.

Patent Document 1 discloses an apparatus for quantitatively analyzing and evaluating the feeling when a human finger touches the skin or a substance. This device measures the frictional force and acceleration applied to the contact when a predetermined pressure is applied to the predetermined surface of the object to be measured and slides, and the contact slides on the predetermined surface of the object to be measured. At this time, the frictional force and acceleration acting on the predetermined surface of the object to be measured are measured. This makes it possible to simultaneously measure and display the pressing characteristic, which is the feel of the fingertip touching an object, and the pressure receiving characteristic, which is the feel of the skin touched by the finger.
In Non-Patent Document 1, it is possible to identify skin having a different surface morphology by measuring the skin surface using the probe portion of a skin roughness measurement sensor using a polyvinylidene fluoride (PVDF) film as a sensitive material. It is disclosed that there is. This probe portion has a structure in which a cylindrical aluminum pipe is covered with sponge rubber, a PVDF film is provided on the sponge rubber, and the PVDF film is covered with a cellophane film and gauze.
In Non-Patent Document 2, an artificial finger is attached to the tip of the grip of the force sensation device, the grip position is automatically controlled, and the difference between the target position and the actual position when the tactile perception operation is performed on the real object is used. It is disclosed to estimate whether or not the fingertip is in contact with an object, the direction of the force applied to the fingertip, and the like.
In Non-Patent Document 3, a finger-worn sensor using a PVDF film as a sensitive material is slid on the skin surface, and PVDF output and strain gauge output are measured to evaluate the roughness and hardness of the skin surface. It is disclosed to do. This sensor is based on stainless steel, has a structure in which sponge rubber, PVDF film, and cellophane film are arranged in order, and gauze imitating a human fingerprint is attached to the outermost part.
Non-Patent Document 4 discloses a skin vibration measurement sensor using a PVDF film. This sensor is used by being attached to the finger of the measurer, and by detecting the vibration propagating through the skin with a PVDF film, the vibration generated in the skin due to the mechanical interaction with the subject is measured.

Japanese Unexamined Patent Publication No. 2016-38317

Mami Tanaka, "Development of Tactile Sensors (Sentience Measurement and Application to Medical Treatment)", Journal of AEM Society of Japan, Vol. 7, No. 4 (1999), p. 359-p. 366 Ko Wakita et al., "Estimation of Hardness and Friction Based on Tactile Perception Analysis with Artificial Fingers", IEJ Transitions on Electronics, Information and Systems, Vol. 136 No. 8 2016, pp. 1085-1091 Mami Tanaka et al., "Development and Research of Sensors for Measuring Skin Properties", JSME Proceedings (C), Vol. 69, No. 685, 2003-9, p. 157-164 Yoshihiro Tanaka, 3 others, "Basic study on skin vibration monitor using wearable tactile sensor using PVDF film", Institute of Electronics, Information and Communication Engineers 114 (483), 63-66, 2015-3-2 Society

However, each of the above-mentioned methods leaves room for improvement in quantitatively evaluating the surface texture or tactile sensation of the target surface.
The present invention relates to a technique for quantitatively evaluating human skin or cosmetics based on the condition of human skin or a target surface which is a surface created by imitating human skin.

In the aspect of the present invention, the following configuration is adopted in order to solve the above-mentioned problems.
Aspects of the present invention relate to a method for evaluating human skin or cosmetics. In this evaluation method, a contactor having a contact surface capable of surface contact with a human skin or a surface created by imitating a human skin as a part of the surface, and the contact surface in the contactor. A step of bringing the contact surface into contact with the target surface and sliding the contact along the target surface by using a vibration sensor provided at a portion separated from the vibration propagation portion, and the sliding. It includes an information acquisition step of acquiring vibration information detected by the vibration sensor during movement, and an evaluation step of evaluating the state of the target surface based on the acquired vibration information.
Another aspect of the present invention is, for example, an evaluation device for human skin or cosmetics used in the above-mentioned method for evaluating human skin or cosmetics. Further, another aspect is related to a device (information processing device, computer) that executes the above-mentioned evaluation method of human skin or cosmetics, and is related to a program that causes a computer to execute the evaluation method. It relates to a storage medium that can be read by a computer that records various programs. This recording medium includes a non-temporary tangible medium.

According to the above aspect, it is possible to provide a technique for quantitatively evaluating human skin or cosmetics based on the state of human skin or a target surface which is a surface created by imitating human skin.

It is a flowchart which shows the evaluation method of the human skin or cosmetics which concerns on 1st Embodiment. It is a flowchart which shows the cosmetics evaluation method which concerns on 2nd Embodiment. It is a block diagram which conceptually shows the main structure of the evaluation apparatus. It is a figure which shows the structure of a probe. It is a figure which shows the use example of a probe. It is a flowchart which shows the cosmetics evaluation method which concerns on a modification. It is a figure which shows the structure of the probe which concerns on the modification. FIG. 8A is a diagram showing vibration information of a finger model 4 provided with a fine and shallow groove group, and FIG. 8B shows vibration information of a finger model 5 not provided with a groove group. It is a figure. FIG. 9A is a diagram showing vibration information of the finger model 4 provided with the fine and shallow concave groove group, and FIG. 9B is the vibration information of the finger model 2 provided with the coarse and shallow concave groove group. It is a figure which shows. FIG. 10A is a diagram showing vibration information of the finger model 5 having a relatively small rigidity, and FIG. 10B is a diagram showing vibration information of a finger model 6 having a relatively large rigidity. FIG. 11A is a diagram showing vibration information obtained by using a finger model (contactor), and FIG. 11B is a diagram showing vibration information obtained by using an index finger. It is a figure which shows the difference of the vibration information with the difference of the cosmetic applied to the skin.

Hereinafter, an example of a preferred embodiment of the present invention (hereinafter referred to as the present embodiment) will be described. It should be noted that each of the following embodiments is an example, and the present invention is not limited to the configuration of each of the following embodiments.

[First Embodiment]
The method for evaluating human skin or cosmetics according to the first embodiment (hereinafter referred to as this method) will be mainly described with reference to FIG. FIG. 1 is a flowchart showing a method for evaluating human skin or cosmetics according to the first embodiment.
The cosmetics evaluated in the first embodiment include human skin such as lotion, base cosmetics such as milky lotion and sunscreen (including skin care products), cleaning agents, and makeup cosmetics such as foundation. Includes various cosmetics that are applied, sprayed and packed into.

This method uses a contact and a vibration sensor provided on the contact.
The contactor has a contact surface on a part of the surface for contacting with the target surface (evaluated surface). The contact may also be referred to as a carrier. The shape of the contactor is arbitrary, such as a rod shape or a plate shape, as long as the surface has a contact surface capable of surface contact with the target surface. The contact surface may be a flat surface or a curved surface. Further, the contactor is preferably portable in order to improve usability, but may be installed.

The target surface is the surface of human skin or a surface created by imitating human skin. That is, the surface of human skin may be the target surface, or the surface of an object created by imitating human skin such as bioskin may be the target surface. The target surface may be in a state where cosmetics are applied when the sliding step described later is executed, or in a state where nothing is applied (at that time, it penetrates into the inside and is on the target surface). Including the state where nothing exists). However, when the evaluation target of this method is human skin, it goes without saying that the target surface is the surface of human skin.

The vibration sensor is provided at a portion of the contactor that is separated from the contact surface via a vibration propagation portion. When the contact is a rod-shaped body, the vibration sensor may be separated from the contact surface in the axial direction of the contact, or may be separated from the contact surface in the internal direction of the contact, or may be in contact. It may be separated from the surface in the circumferential direction. Further, when the contact is a plate-shaped body, the vibration sensor may be separated from the contact surface along the contact surface or may be separated from the contact surface in the thickness direction. Of course, a plurality of vibration sensors may be provided on the contactor, and each vibration sensor may be provided at a position separated from the contact surface.

The vibration sensor detects the vibration propagated from the contact surface through the vibration propagation site. The specific configuration of the vibration sensor is not limited as long as it can detect vibration. The vibration sensor can be realized by, for example, a piezoelectric body, a strain gauge, an acceleration sensor, or the like. Since the vibration sensor detects the vibration propagated through the vibration propagation portion, it is preferably in the form of a sheet or a film having a wide detection area.

As shown in FIG. 1, this method uses such a contactor and a vibration sensor to bring the contact surface of the contactor into contact with the target surface, and slides the contactor along the target surface (. S01), a step of acquiring vibration information detected by the vibration sensor during sliding (S03), and a step of evaluating the state of the target surface based on the acquired vibration information (S05) are included.
In the step (S01), the contact may be slid by human power, or the contact may be slid automatically (electrically) by an actuator or the like.

The "vibration information detected by the vibration sensor" in the step (S03) is information about the vibration detected by the vibration sensor or information based on the detected vibration, and is a form of vibration information acquired in the step (S03). There is no limitation on. The vibration information acquired in the step (S03) may be vibration waveform data (vibration time series data) obtained from the output of the vibration sensor, or processing such as frequency analysis may be performed on such vibration waveform data. It may be the vibration power spectrum data obtained by the application. Further, the vibration information acquired in the step (S03) may be vibration characteristic information extracted from the data related to such vibration, or the surface texture obtained from the correlation between the vibration and the surface texture of the target surface. It may be information about tactile sensation or information about tactile sensation obtained from the correlation between vibration and tactile sensation.
The step (S03) is executed by, for example, a device such as the evaluation device 1 described later or a computer.

The specific evaluation method of the step (S05) is not particularly limited as long as it is the state evaluation of the target surface based on the vibration information. For example, vibration information corresponding to various tactile sensations such as rough, smooth, and moist or surface texture is acquired in advance, and the state of the target surface (for example, tactile sensation) is compared between the vibration information and the vibration information obtained from the target surface. Or the surface texture) can be evaluated relatively. Also, compare the vibration information acquired from the target surface of the skin surface of a subject using a certain cosmetic with the vibration information acquired from the skin of a celebrity such as a favorite singer or actress. Therefore, the skin condition of the subject can be evaluated by the closeness of touch with the celebrity.

When the evaluation target of this method is human skin (step (S07); NO), the condition of human skin as a target surface is evaluated in step (S05), and this method ends.
In this case, the step (S05) may be performed by a device such as the evaluation device 1 described later or a computer, or may be performed by a person. In the former case, for example, quantitative information on the tactile sensation of the skin such as smoothness and moistness, and quantitative information on the surface texture of the skin such as fineness and roughness are output. In the latter case, for example, along with vibration information about the target surface, other information that the evaluator should compare with the vibration information is output from the device or computer. Other information to be compared may be output to a print medium or the like in advance.
Further, in the evaluation process, the obtained vibration information is evaluated via human hearing or tactile sensation by connecting a speaker to a computer and outputting it as sound, or connecting a vibrator and outputting it as vibration information. You can also.

When the evaluation target of this method is cosmetics (step (S07); YES), in the step (S05), the state of human skin as the target surface or a surface created by imitating human skin is evaluated. Based on the result, the cosmetic applied to the target surface is evaluated in the step (S09). Further, in this case, the target cosmetic may be applied to the target surface before (immediately before) the execution of the step (S01), or when the step (S01) is executed, the target cosmetic penetrates below the target surface and is applied to the target surface. The target cosmetic may be applied to the target surface before the execution of this method so that the material does not exist. Further, the target cosmetic may be continuously applied to the target surface for a predetermined period such as several months, several weeks, or several days.

The step (S09) may also be performed by a device such as the evaluation device 1 described later or a computer, or may be performed by a person. In the former case, for example, based on the quantitative information of the tactile sensation or surface texture of the target surface as described above, the result of the evaluation performed by the device or the like such as the quality of the cosmetic, the suitability of the cosmetic, and the tactile sensation of the cosmetic. Information indicating that is output. In the latter case, for example, the evaluator may evaluate the suitability of the cosmetics based on the state information of the target surface output in the step (S05).

As described above, in the first embodiment, the contact surface is a target surface in a state where the contact surface of the contactor is in surface contact with the surface of human skin or the target surface which is a surface created by imitating human skin. By sliding along the line, the vibration propagated from the contact surface through the vibration propagation portion is detected by the vibration sensor, and the state of the target surface is evaluated based on the detected vibration information.
As a result, when the target surface is the surface of human skin, the human skin itself can be evaluated, or the human can be evaluated based on the evaluation result of the state of the target surface (human skin surface). You can also evaluate the cosmetics applied to your skin. Further, when the target surface is a surface created by imitating human skin, the cosmetic applied to the target surface can be evaluated based on the evaluation result of the state of the target surface.

The vibration information acquired in the first embodiment is information whose main component is a force indirectly applied to the vibration sensor through the contactor (vibration propagation site) rather than a force directly applied to the vibration sensor. be. As in the methods disclosed in the above-mentioned patent documents and non-patent documents, the vibration information of the force directly applied to the vibration sensor depends on the force for pressing the contact against the target surface, the speed of sliding, and the like. Where errors are likely to occur, according to the first embodiment, it is possible to suppress such errors and obtain vibration information that indicates the state of the target surface (surface texture, tactile sensation, etc.) with high accuracy.
In addition, it has been pointed out that human tactile sensation may utilize the vibration propagating due to the deformation of the fingers when touching the object for perception. According to this knowledge, the vibration information obtained in the first embodiment can be said to be information corresponding to the human tactile sensation. Therefore, according to the first embodiment, the state of the target surface is evaluated by an index corresponding to the tactile sensation perceived when the target surface is touched, and by extension, the cosmetic applied to the human skin or the target surface. Can be evaluated with high accuracy.

[Second Embodiment]
Next, the cosmetics evaluation method according to the second embodiment will be described in detail with reference to FIG. FIG. 2 is a flowchart showing a cosmetics evaluation method according to the second embodiment.
The cosmetics evaluation method according to the second embodiment (hereinafter, may be referred to as the present evaluation method) is executed by using the evaluation device provided with the above-mentioned contactor and vibration sensor, and as shown in FIG. The process (S11) to the process (S17) are included.

The step (S11) is a step of applying a cosmetic (target cosmetic) to be evaluated on the target surface. Here, an example is shown in which the surface of human skin (for example, the cheek) is used as the target surface. However, the target surface may be a surface created by imitating human skin such as bioskin. The target cosmetics are arbitrary, such as base cosmetics and make-up cosmetics. For example, in the step (S11), the target cosmetic is applied to the cheek of the subject.

The step (S12) is a step using an evaluation device. Specifically, in the step (S12), the contact surface of the contact is brought into contact with the target surface, and the contact is slid along the target surface.
The force and sliding speed at which the contact surface of the contactor is pressed against the target surface is preferably close to the force and speed at which a person touches the skin in order to obtain the tactile sensation of the skin. This is because it is possible to evaluate with an index that is close to the human tactile sensation. In this evaluation method, a contactor imitating a human finger is brought into contact with and slides on the target surface in a state of being fixed between the human finger and the finger, so that the pressing force and sliding when a person touches the skin. Achieve speed. The specific mounting form of the contactor will be described later.

The step (S13) is a step of acquiring vibration information detected by the vibration sensor during sliding in the step (S12). In this evaluation method, the values detected by the vibration sensor are sequentially received by the computer, and the time-series data of the detected values are stored in the computer as vibration information. At this time, the computer may store the detected value and the time information in association with each other.

In the step (S14), it is determined whether or not to replace the contacts used in the step (S12). In this evaluation method, a plurality of types of contacts are prepared for replacement. Each contact has some or all properties different from each other.
The "property" here is the shape, size, rigidity (flexibility) of the contactor, the surface shape of the contact surface (for example, the shape and depth of the fingerprint) and the like. For some contacts with different properties, it is preferable that at least one or both of the contact surface and the vibration propagation site have different properties.
For example, if there are still contacts that have not been used in the step (S12), it may be determined that the contacts are to be replaced. Of course, only some of the prepared contacts of the plurality of types may be used.

The step (S15) is a step of exchanging the contacts based on the determination result in the step (S14). In this evaluation method, since the vibration sensor has a structure that can be attached to and detached from the contactor, the entire contactor is replaced. However, in the step (S15), a part of the contacts may be replaced. That is, the step (S15) can be referred to as an exchange step of exchanging a part or all of the contacts with contacts having different properties.
Further, in this evaluation method, the contact is replaced manually, but the contact may be replaced automatically.
After that, the steps (S12) and (S13) are executed using the replaced contacts, and vibration information is acquired for each of the contacts having different properties.

The step (S16) is a step of evaluating the state of the target surface (the surface of human skin) based on the vibration information acquired in the step (S13). Specifically, when there are no contacts to be replaced (S14; NO), the state of the target surface is evaluated based on the vibration information for each contact acquired in the step (S13) (S16). In the step (S16), for example, the degree of surface texture such as coarseness, fineness, and smoothness may be evaluated for each contactor, or the degree of tactile sensation such as smoothness and moistness may be evaluated.
The step (S17) is a step of evaluating the target cosmetics (common cosmetics) based on the evaluation results in the step (S16). In the step (S17), for example, the quality of the cosmetic, the suitability of the cosmetic, and the like are evaluated.

In this evaluation method, for example, for each human attribute such as age group and gender, a plurality of types of contacts corresponding to the properties of the fingers of that attribute can be used. Since the rigidity and size of the fingers differ between males and females or young and elderly, rigid contacts corresponding to male fingers and rigid contacts corresponding to female fingers, or teenagers. Rigid contacts corresponding to fingers and rigid contacts corresponding to fingers in their 60s can be prepared.

The vibration information obtained by using such a plurality of types of contacts can be said to be vibration information corresponding to the tactile sensation of each human attribute. Therefore, by comparing the vibration information of each contactor and evaluating the common cosmetics, it is possible to evaluate whether the tactile sensation to the target surface differs depending on the human attribute. If the difference between human attributes is small and the vibration information shows a favorable tactile sensation, it can be evaluated that the target cosmetics are received by everyone.
Such effects can be obtained even if a contactor suitable for the properties of the fingers for each human attribute cannot be prepared. For example, contacts having different rigidityes within the rigidity range corresponding to human fingers may be used.

Next, the evaluation devices used in the first embodiment and the second embodiment will be described with reference to FIGS. 3, 4, and 5. FIG. 3 is a block diagram conceptually showing the main configuration of the evaluation device 1. FIG. 4 is a diagram showing the configuration of the probe 2. FIG. 5 is a diagram showing a usage example of the probe 2.
The evaluation device 1 is a device for evaluating human skin or cosmetics, and as shown in FIG. 2, has a probe 2, a vibration measuring device 4, and an output device 5 as main configurations.

The vibration measuring device 4 receives an output from the vibration sensor of the probe 2 (piezoelectric film 233 described later), and generates vibration information based on the output. The vibration information generated by the vibration measuring device 4 is information related to vibration detected by the vibration sensor (piezoelectric film 233) or information based on the detected vibration, and is described above as "vibration information detected by the vibration sensor". That's right.
As long as the vibration measuring device 4 can generate vibration information based on the output from the vibration sensor, its specific measurement principle and internal configuration are not limited. For example, the vibration measuring device 4 may be connected to an output line from a vibration sensor and may have a filter (bandpass filter or the like) for removing various noises, an amplifier, an AD converter, or the like. The vibration measuring device 4 may be, for example, a measuring device called an oscilloscope, a data logger, or the like.

The output device 5 outputs the vibration information generated by the vibration measuring device 4. The output device 5 is not limited in its output form or the like as long as it can output the vibration information in some form. For example, the output device 5 is a display unit of an oscilloscope, a display device such as an LCD (Liquid Crystal Display) or a CRT (Cathode Ray Tube) display, a printer, or the like.
Both the vibration measuring device 4 and the output device 5 or the output device 5 corresponds to an output processing unit that outputs information on the surface texture or tactile sensation of the target surface based on the vibration information detected by the vibration sensor (piezoelectric film 233). ..
Further, as an output device, an acoustic output means such as a speaker, a vibration means equipped with a vibrator, or the like can be used, and when such a device is used, vibration information is evaluated via human hearing or tactile sensation. do.

As shown in FIG. 3, the probe 2 has a contactor 21, a sensor unit 23, a contactor operation unit 25, and the like.
The contact 21 has a contact surface 211 that can make surface contact with the target surface as a part of the surface, and has a vibration propagation portion 213 between the contact surface 211 and the vibration sensor (piezoelectric film 233 described later). ing.
As illustrated in FIG. 3, it is desirable that the contactor 21 has a shape imitating a human finger. However, the shape of the contact 21 does not have to be close to the shape of a human finger, but may be a rod shape such as a columnar shape, a conical shape, or a prismatic shape, and preferably has a tapered shape, that is, a radius of gyration at the tip. It is preferable to have a shape smaller than that of the root.
Further, it is preferable that the contact surface 211 is formed with a fingerprint pattern that imitates the fingerprint of a human finger. This is because it is possible to obtain vibration information that is close to the vibration that affects the human tactile sensation. However, the fingerprint pattern provided on the contact surface 211 may have two or more concave grooves, and the roughness and depth thereof are arbitrary, and the fingerprint is also obtained for the concave groove line formed by connecting the concave grooves. It does not have to be arcuate as in the above, but may be linear.

Further, it is preferable that at least one or both of the contact surface 211 and the vibration propagation portion 213 of the contact 21 has flexibility imitating a human finger. For example, either one or both of the contact surface 211 or the vibration propagation portion 213 is formed of a flexible soft resin material such as a silicone resin, a urethane resin, or an acrylic resin. Of course, the parts other than the contact surface 211 and the vibration propagation part 213 in the contact 21 may also be formed of such a flexible material, or the entire contact 21 may be formed of such a material. good. Since the contact 21 has flexibility imitating a human finger in this way, vibration information corresponding to the human tactile sensation can be obtained.

A contactor operation portion 25 is provided at the base end portion of the contactor 21 (the end portion on the root side of the simulated finger). The contact operation unit 25 extends in the axial direction from the base end portion of the contact 21. As illustrated in FIG. 4, when the probe 2 is used by being sandwiched between the fingers, the probe can be more firmly fixed between the fingers by the contact member operating portion 25 coming into contact with the back of the hand.
In the example of FIG. 4, the contact surface 211 is arranged on the palm side, the probe 2 is sandwiched between the index finger and the middle finger of the operator so that the contactor operating portion 25 abuts on the back of the hand, and the probe 2 is the index finger and the middle finger. At the same time, it is fixed by a fastening belt 27 having a hook-and-loop fastener (magic tape (registered trademark), etc.).
With the probe 2 fixed between the fingers in this way, the operator strokes the cheek of the subject as the target surface with those fingers to obtain a tactile sensation, so that the operator obtains a tactile sensation from the cheek. The probe 2 can be slid with the pressing force and the sliding speed, and vibration information corresponding to the tactile sensation can be obtained with high accuracy.

The contact 21 is further provided with a sensor unit 23. Specifically, the sensor unit 23 is detachably wound at a position of the contactor 21 that does not overlap with the contact surface 211.
The sensor unit 23 has a piezoelectric film 233 as a vibration sensor. For example, a PVDF film is used as the piezoelectric film. The output line 239 is connected to the piezoelectric film 233, and the other end of the output line 239 is connected to the vibration measuring device 4. Further, the piezoelectric film 233 is covered and protected by a cover film 235 such as a cellophane film.
The piezoelectric film 233 covered with the cover film 235 is connected to the sensor belt portion 231 and the surface fastener portion 232 at both ends thereof, and forms a series of strips together with the sensor belt portion 231 and the surface fastener portion 232.
The sensor belt portion 231 has a hook-and-loop fastener (not shown) on the back surface.
The hook-and-loop fastener portion 232 is an end portion opposite to the end portion connected to the piezoelectric film 233, and is connected to the insertion portion 237.
The insertion portion 237 has an insertion hole 238, and the end portion of the sensor belt portion 231 is inserted into the insertion hole 238.

The sensor unit 23 is wound around the contactor 21 by such a structure. That is, the sensor unit 23 winds the sensor belt portion 231 forming a series of strips, the piezoelectric film 233, and the surface fastener portion 232 around the contactor 21, and inserts the end portion of the sensor belt portion 231 into the insertion hole 238. By locking the surface fastener portion (not shown) on the back surface of the sensor belt portion 231 and the upper surface of the surface fastener portion 232, the sensor belt portion 231 is attached to the contactor 21. Therefore, the sensor belt portion 231, the hook-and-loop fastener portion 232, and the insertion portion 237 can be referred to as attachment / detachment portions that allow the vibration sensor (piezoelectric film 233) to be attached / detached to / from the contactor 21.
As a result, at least a plurality of contacts 21 (including the contact operation unit 25) having different flexibility of the contact surface 211 can be prepared and used while exchanging the contacts 21 while attaching and detaching the sensor unit 23. can.

By winding the sensor unit 23 around the contactor 21 in this way, the piezoelectric film 233 is separated from the contact surface 211 of the contactor 21 via the vibration propagation portion 213 (from the simulated first joint portion of the finger). Will be installed on the root side). That is, the vibration sensor here is a piezoelectric film 233 provided on the root side of the first joint portion of the finger simulated by the contact 21. Further, there is a surface region in which the vibration sensor (piezoelectric film 233) is not provided on the tip side of the finger from the first joint portion of the contact 21, and the region includes the contact surface 211 and the vibration propagation portion 213. ..
The contact surface 211 and the piezoelectric film 233 (vibration sensor) have a positional relationship in which they are separated from each other in the longitudinal direction of the contact 21 via the vibration propagation portion 213, so that the piezoelectric film 233 comes into contact with the contact surface 211. Vibration propagating around the surface of the child 21 can be detected. Since this is close to the vibration perceived when a person obtains a tactile sensation, vibration information corresponding to the tactile sensation can be obtained.
Further, in the examples of FIGS. 3 and 4, the piezoelectric film 233 has a length in the longitudinal direction over the entire circumference of the contact 21 in the circumferential direction, which is half the circumference of the simulated ventral side of the finger. That is, since the piezoelectric film 233 is arranged on the same ventral side of the finger as the contact surface 211 of the contact 21, the piezoelectric film 233 can accurately capture the vibration. However, the length of the vibration sensor (piezoelectric film 233) in the longitudinal direction is not limited to such an example, and may be a length extending over the entire circumference of the contact 21 in the circumferential direction, or may not be half a circumference. It may be the circumference length from the ventral side to the back side of the fingers. Further, the vibration sensor (piezoelectric film 233) may be arranged so as to be separated from the contact surface 211 in the circumferential direction of the contact 21. In this case, the vibration sensor (piezoelectric film 233) may be arranged on all or part of the simulated contact surface 211 in the circumferential direction (only on the side surface of the finger, only on the back side of the finger, or both). ..

[Modification example]
In the second embodiment, the common cosmetics are evaluated based on the vibration information before and after the replacement of the contactor 21, but the evaluation method of the cosmetics based on the vibration information is not limited to the above example.
FIG. 6 is a flowchart showing a cosmetics evaluation method according to a modified example (hereinafter, may be referred to as this modified method).
This modification method can also be performed using the evaluation device 1 described above. As shown in FIG. 6, this modification method includes a step (S21) to a step (S27).

Also in this modification method, a plurality of types of contacts 21 are prepared for replacement. Each contact 21 has some or all properties different from each other. It is desirable that each contact 21 has different properties of at least one or both of the contact surface 211 and the vibration propagation portion 213.
In this modification method, the contactor 21 corresponding to the skin properties of the fingers of the target person or the target attribute group is used.

Specifically, first, the target cosmetic is applied to the target surface by the step (S21). The step (S21) is the same as the above-mentioned step (S11).
In the step (S22) and the step (S23), as illustrated in FIG. 4, the contact 21 to which the sensor unit 23 is mounted is replaced with the contact 21 corresponding to the skin properties of the finger of the target person or the target attribute group. Will be done. If the sensor unit 23 is already attached to the contactor 21 corresponding to the skin properties of the fingers of the target person or the target attribute group, replacement is not required.
Here, the target attribute group is a group classified by human attributes, for example, a group of a certain age group, a group of a certain gender, and the like.

Subsequently, the step (S24) is executed using the contact 21 exchanged in the step (S23), and the step (S25) and the step (S26) are executed. That is, in the step (S25), the vibration information after the replacement of the contact 21 is acquired, and in the step (S26), the state of the target surface is evaluated based on the vibration information acquired in the step (S25).
Since the vibration information acquired in the step (S25) is based on the vibration generated by the contactor 21 corresponding to the skin properties of the fingers of the target person or the target attribute group, it can be said that it corresponds to the tactile sensation of the target person or the target attribute group. Therefore, it can be said that the evaluation performed in the step (S26) is the state evaluation of the target surface based on the tactile sensation of the target person or the target attribute group.

Finally, in the step (S27), the target cosmetic is evaluated based on the evaluation result in the step (S26). As described above, the evaluation result in the step (S26) can be said to be the evaluation result based on the tactile sensation of the target person or the target attribute group. Therefore, the evaluation performed in the step (S27) is the tactile sensation of the target person or the target attribute group. It can be said that it is an evaluation of cosmetics based on.
Therefore, according to this modification method, it is possible to evaluate the cosmetics based on the tactile sensation that the subject or the target attribute group will perceive without actually touching the target surface.

As another modification, in the step (S23), it may be replaced with the contactor 21 corresponding to the specific property to be evaluated among the surface properties of the target surface. By doing so, it is possible to obtain vibration information that emphasizes a specific tactile sensation based on the specific properties of the contact 21 after replacement, and as a result, the cosmetic based on the evaluation index mainly based on the specific tactile sensation. Can be evaluated. For example, by replacing with a contactor 21 having a contact surface 211 having a high rigidity, vibration information that emphasizes the feeling of bulkiness can be obtained, and as a result, cosmetics are evaluated by an evaluation index mainly for the feeling of bulkiness. be able to.

Further, the method shown in FIG. 2 and the modification method shown in FIG. 6 can also be used for evaluation of human skin, not for evaluation of cosmetics. In this case, the step (S17) and the step (S27) are unnecessary, and the step (S11) and the step (S21) may or may not be executed.
Even in this case, by comparing the vibration information of each contactor and evaluating the subject's skin as the target surface, it is possible to evaluate whether the tactile sensation of the subject's skin differs depending on the human attribute to be touched. .. It is also possible to perform a skin evaluation of the subject based on the tactile sensation that the subject or the target attribute group will perceive.

The evaluation device 1 can also be variously modified.
For example, in the example of FIG. 5, the probe 2 was used by sandwiching it between human fingers, but by pinching and moving the contact operation unit 25 with the fingers, the contact surface 211 of the contact 21 is the target surface. It can also be slid along.
Further, the contact 21 may have a hollow portion and an insertion port into which a human finger can be inserted from the proximal end side of the contact 21 into the hollow portion. As a result, the fingers can be fitted to the contactor 21 for use. Also in this structure, the contact surface 211 of the contact 21 can be slid along the target surface with the same pressing force and sliding speed as when a person touches the target surface in order to obtain a tactile sensation.

FIG. 7 is a diagram showing the configuration of the probe 2 according to the modified example.
In this modification, the first partial contactor 31 provided with the contact surface 211 and the second partial contactor 32 provided with the vibration sensor (piezoelectric film 233) are detachably formed. Specifically, the first partial contactor 31 imitates the tip end side of the finger, and the second partial contactor 32 imitates the base end side (root side) of the finger. Then, the protrusion 311 provided on the base end surface of the first partial contactor 31 is fitted into a fitting hole (not shown) provided on the tip end surface of the second partial contactor 32, and is fitted with the wall surface of the protrusion 311. Both are locked by the frictional force between the inner peripheral surface of the fitting hole.
In this modification, since the piezoelectric film 233 does not have to be detachable from the second partial contactor 32, the piezoelectric film 233 may be attached to the second partial contactor 32 in a state of being covered with the cover film 235. ..

In this modification, at least a plurality of first partial contacts 31 having different properties of the contact surface 211 may be prepared. As a result, the first partial contactor 31 can be exchanged with respect to the second partial contactor 32 provided with the piezoelectric film 233.
The protrusion 311 and the fitting hole are partial contacts (first partial contacts 31) that are a part of the contacts including the contact surface 211, and the flexibility of the contact surfaces 211 is different from each other. (First partial contactor 31) can be described as a detachable portion that can be attached to and detached from a part of the contactor (second partial contactor 32) including a portion provided with a vibration sensor (piezoelectric film 233). ..

Further, in the evaluation device 1 shown in FIG. 3, the probe 2 and the vibration measuring device 4 are separately configured, but the vibration measuring device 4 may be built in the probe 2. Further, the vibration measuring device 4 is a device that generates vibration waveform data from the output of a vibration sensor, and a computer (information processing device) that stores the vibration waveform data and executes various processes applied to the vibration waveform data. It may be realized separately.
Further, in the plurality of flowcharts used in the above description, a plurality of processes (processes) are described in order, but the execution order of each process is not limited to the order of description. The order of the illustrated processes can be changed within a range that does not hinder the contents. For example, in FIG. 2, the vibration information acquisition step (S13) may be executed only immediately before the step of evaluating the state of the target surface (S16). That is, the vibration information may be divided for each contactor and collectively acquired.

Examples will be given below, and the above contents will be described in more detail. However, the description of the following examples does not impose any limitation on the above contents.

In this embodiment, six types of contacts 21 having different properties were prepared in order to verify the above-mentioned effects. Hereinafter, the prepared six types of contacts 21 will be referred to as finger models 1 to 6.
The finger models 1, 2, 3, 4 and 5 were generally molded of a softer material than the finger model 6. That is, the rigidity of the finger models 1, 2, 3, 4, and 5 was set to be equal and smaller than the rigidity of the finger model 6.
Further, a fingerprint sheet made of silicon harder than the material of the finger model and having a group of concave grooves is attached to the finger models 1, 2, 3 and 4 as the contact surface 211. The concave groove group formed on each fingerprint sheet is formed so that the combination of depth and roughness is different for each fingerprint sheet.
The properties of each finger model are summarized below.
Finger model 1: Small rigidity, with fingerprints (coarse and deep)
Finger model 2: Small rigidity, with fingerprints (coarse and shallow)
Finger model 3: Small rigidity, with fingerprints (fine and deep)
Finger model 4: Small rigidity, with fingerprints (fine and shallow)
Finger model 5: low rigidity, no fingerprints Finger model 6: high rigidity, no fingerprints

On the other hand, three types of bioskin that imitated human skin were prepared for evaluation. Specifically, bioskin that imitates dry human skin (hereinafter referred to as dry skin model), bioskin that imitates moist human skin (hereinafter referred to as moist skin model), and Bioskins in those intermediate states (hereinafter referred to as standard skin models) were prepared. And, it has been confirmed by the evaluator that the tactile sensations of these three types of bioskin are different.
Then, the probe 2 was slid along the surface of each of the three types of bioskin while exchanging the above-mentioned six types of contacts 21, and vibration information was acquired. At this time, the evaluator pinched the contactor operation unit 25 with his / her fingers and slid the probe 2 so that the following measurement conditions were unified.
Measurement conditions = pressing force: 0.3N, sliding speed: approx. 75 mm / sec

The vibration information thus acquired is shown in FIGS. 8, 9 and 10.
FIG. 8 is a diagram showing the difference in vibration information depending on the presence or absence of the concave groove group provided on the contact surface 211, and FIG. 8 (a) shows the vibration information of the finger model 4 provided with the fine and shallow concave groove group. 8 (b) shows the vibration information of the finger model 5 in which the groove group is not provided. In each graph of FIGS. 8A and 8B, a dry skin model (dry), a standard skin model (normal), and a moist skin model (wet) are shown on the horizontal axis, and the vibration intensity is shown on the vertical axis. The range and average value of are shown.

According to FIG. 8A, it can be confirmed that the vibration intensity of the dry skin model is high, the vibration intensity of the moist skin model is low, and the vibration intensity of the standard skin model is in the middle.
That is, according to FIG. 8A, it is possible to quantitatively evaluate the difference in surface texture and surface tactile sensation in the skin model (bioskin) by the contactor 21 in which the concave groove group is provided on the contact surface 211. It is confirmed.
Further, according to the comparison between FIGS. 8 (a) and 8 (b), the acquired vibration intensity is higher in the finger model having the concave groove group than in the finger model having the concave groove group. In comparison, it can be seen that it is large overall. Therefore, in order to acquire vibration information with high sensitivity, it is desirable to provide a group of concave grooves on the contact surface 211.

FIG. 9 is a diagram showing the difference in vibration information due to the roughness (coarse and fine) of the concave groove group provided on the contact surface 211, and FIG. 9 (a) shows a finger provided with the fine and shallow concave groove group. The vibration information of the model 4 is shown, and FIG. 9B shows the vibration information of the finger model 2 provided with the coarse and shallow groove group. In the graphs of FIGS. 9 (a) and 9 (b), the vibration frequency (Hz) is shown on the horizontal axis, and the power spectral density (dB / Hz) is shown on the vertical axis. A standard skin model was used as the target surface.
From the comparison between FIGS. 9 (a) and 9 (b), it can be seen that if the concave groove group provided on the contact surface 211 is fine, high frequency vibration can be easily obtained.
As a result, it is confirmed that the obtained vibration characteristics differ due to the difference in the roughness of the concave groove group provided on the contact surface 211, that is, the difference in the surface shape of the contact surface 211.

10A and 10B are diagrams showing the difference in vibration information due to the rigidity of the contactor 21, FIG. 10A shows the vibration information of the finger model 5 having a relatively small rigidity, and FIG. 10B shows the relative vibration information. The vibration information of the finger model 6 having a large rigidity is shown. In each graph of FIGS. 10A and 10B, a dry skin model (dry), a standard skin model (normal), and a moist skin model (wet) are shown on the horizontal axis, and the vibration intensity is shown on the vertical axis. The range and average value of are shown.
By comparison between FIGS. 10 (a) and 10 (b), the soft contact 21 has a larger difference in vibration intensity between the dry skin model and the standard skin model than the hard contact 21, and the hard contact. It can be seen that the difference in vibration intensity between the standard skin model and the moist skin model is larger in 21 than in the soft contact 21.
This confirms that the specific surface texture or tactile sensation can be emphasized by the difference in the rigidity of the contact 21.

Furthermore, in this example, it was verified that the skin surface of the human forearm can also be evaluated using the probe 2 having the above-mentioned finger model (contact 21). At this time, as a comparative example, vibration information was also acquired by attaching the sensor unit 23 to the index finger of the evaluator and sliding the index finger against the skin surface.
FIG. 11 (a) shows the vibration information obtained by using the finger model (contactor 21), and FIG. 11 (b) shows the vibration information obtained by using the index finger. 11 (a) and 11 (b) show vibration information for one stroke of the same spot on the skin surface as a target surface, which is stroked four times with a finger model or the index finger. Further, in FIG. 11, the vibration frequency (Hz) is shown on the horizontal axis, and the power spectral density (dB / Hz) is shown on the vertical axis.
From the comparison between FIGS. 11 (a) and 11 (b), it can be seen that the finger model (contactor 21) is less likely to obtain low frequency vibration of less than 100 Hz as compared with a human finger. However, it is known that human vibration sensitivity is high in the frequency band of 200 Hz to 500 Hz, and while the importance of such frequency band is high in the evaluation of the condition of the skin and the tactile sensation of the skin, such frequency band is less than 100 Hz. The importance of low frequency vibration is considered to be low. In this embodiment, the vibration of 100 Hz or higher can be obtained even in the finger model (contactor 21) with almost no difference from the human finger.
As a result, it has been demonstrated that the surface texture or tactile sensation of the target surface can be evaluated with high accuracy even by the vibration information obtained by using the finger model (contactor 21).

In addition, in this example, it was verified that the difference in the tactile sensation of the skin surface to which the cosmetic was applied can be evaluated by using the probe 2 having the above-mentioned finger model (contact 21).
FIG. 12 is a diagram showing a difference in vibration information due to a difference in cosmetics applied to the skin. Specifically, vibration information was acquired when the skin surface of the human forearm to which three types of cosmetics having different tactile sensations were applied was patted with the finger model 3. In FIG. 12, the three types of cosmetics are represented as cosmetics “A”, cosmetics “B”, and cosmetics “C”, and the vertical axis shows the range and average value of the vibration intensity.
According to FIG. 12, it can be seen that the vibration intensity of the cosmetic A is high and the vibration intensity of the cosmetic C is low.
This demonstrates that the vibration information obtained by using the finger model (contactor 21) can also evaluate the difference in the tactile sensation of the target surface due to the applied cosmetics.

1 Evaluation device 2 Probe 4 Vibration measuring device 5 Output device 21 Contact 23 Sensor part 25 Contact operation part 31 First part contactor 32 Second part contact 211 Contact surface 213 Vibration propagation part 231 Sensor belt part 232 Surface fastener part 233 Piezoelectric film (vibration sensor)
235 Cover film 237 Insertion part 238 Insertion hole 239 Output line 311 Protrusion part

Claims (8)

A contactor having a contact surface capable of surface contact with a human skin or a surface created by imitating human skin as a part of the surface, and a vibration propagation site from the contact surface in the contactor. A step of bringing the contact surface into contact with the target surface and sliding the contactor along the target surface by using a vibration sensor provided at a portion separated through the target surface.
An information acquisition process for acquiring vibration information detected by the vibration sensor during sliding, and
An evaluation process for evaluating the state of the target surface based on the acquired vibration information, and an evaluation process.
An exchange step of exchanging a part or all of the contacts with contacts having different properties, and
A method for evaluating human skin or cosmetics, including. A step of applying cosmetics to the target surface is further included before the sliding step.
The method for evaluating human skin or cosmetics according to claim 1. In the information acquisition step, vibration information before and after the replacement of the contact is acquired, respectively.
In the evaluation step, the state of the target surface is evaluated based on the vibration information before and after the replacement.
The method for evaluating human skin or cosmetics according to claim 1 or 2. In the exchange step, a part or all of the contacts are exchanged with contacts corresponding to the skin properties of the fingers of the target person or the target attribute group.
In the information acquisition step, vibration information after replacement of the contact is acquired, and the vibration information is acquired.
In the evaluation step, the state of the target surface is evaluated based on the acquired vibration information.
The method for evaluating human skin or cosmetics according to claim 1 or 2. The contact has a shape that imitates a human finger.
The contact surface of the contact is provided with a concave groove imitating a fingerprint of a human finger.
The vibration sensor is a piezoelectric film provided on the root side of the first joint portion of the finger.
The method for evaluating human skin or cosmetics according to any one of claims 1 to 4. Portable contact that is face-to-face with human skin or a target surface that is a surface created to imitate human skin and has a flexible contact surface as part of the surface that imitates human fingers. With a child
A vibration sensor provided at a portion of the contactor separated from the contact surface via a vibration propagation portion, and a vibration sensor.
A detachable portion that allows the vibration sensor to be attached / detached to a plurality of the contacts having different flexibility of the contact surface, or a partial contact that is a part of the contact including the contact surface. A detachable portion that allows a plurality of partial contacts having different flexibility on the contact surface to be attached to and detached from a part of the contact including a portion provided with the vibration sensor.
A device for evaluating human skin or cosmetics. An output processing unit that outputs information on the surface texture or tactile sensation of the target surface based on the vibration information detected by the vibration sensor.
The evaluation device for human skin or cosmetics according to claim 6. The contact has a shape that imitates a human finger.
The contact surface of the contact is provided with a concave groove imitating a fingerprint of a human finger.
The vibration sensor is a piezoelectric film provided on the root side of the first joint portion of the finger.
The evaluation device for human skin or cosmetics according to claim 6 or 7.

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