TW201913067A - Method for evaluating skin feel of cosmetic and device for evaluating skin feel of cosmetic - Google Patents

Abstract

A method for evaluating skin feel of a cosmetic comprises: a vibration detection step for chronologically detecting vibrations generated by moving a movement body which is kept in contact with a cosmetic applied over a target application surface; a data generation step for generating data related to chronological changes in the frequency spectrum of the vibrations which were detected; and an evaluation step for evaluating the skin feel of the cosmetic using the generated data.

Description

Method for evaluating touch feeling of cosmetics, and device for evaluating touch feeling of cosmetics

The present invention relates to a method for evaluating a touch feeling of a cosmetic, and an apparatus for evaluating a touch feeling of a cosmetic.

In the past, it has been difficult to objectively evaluate the feeling of use of cosmetics such as stickiness, wetness, and refreshment. Therefore, it has been studied to quantify the feeling of use of cosmetics based on the physical properties inherent in cosmetics.

For example, Patent Document 1 discloses a method of performing evaluation based on rheological characteristics. Further, Patent Document 2 discloses a method of evaluating physical properties obtained by shear force measurement as an index. <Prior Art Document> <Patent Literature>

Patent Document 1: (Japanese) Patent No. 5749554 Patent Document 2: (Japanese) Patent Publication No. 2016-180685

<Problems to be solved by the invention>

However, the evaluation index of the cosmetic in the conventional methods disclosed in Patent Documents 1 and 2 is a bulk physical property of the cosmetic. In other words, it is a characteristic measured in a state different from the actual use state of the cosmetic. Therefore, in the conventional method, the feeling of use cannot be accurately evaluated.

In view of the above, it is an object of one embodiment of the present invention to provide a method for evaluating the tactile sensation of a cosmetic more accurately and quantitatively. <Means for solving problems>

According to an embodiment of the present invention for solving the above problems, there is provided a method for evaluating a touch feeling of a cosmetic, comprising: a vibration detecting step of applying an action body to a coated surface by one side over time The cosmetic contact detects the vibration generated by moving the action body; the data generation step generates data on the temporal change of the spectrum of the vibration based on the detected vibration; and an evaluation step of using the generated The data was evaluated for the touch of the cosmetics. <Effects of the invention>

According to an embodiment of the present invention, it is possible to provide a method of evaluating the tactile sensation of cosmetics more accurately and quantitatively.

Hereinafter, embodiments of the present invention will be described, and the present invention is not limited to the embodiments described below.

<Method for Evaluating Tactile Sense of Use of Cosmetics> The inventors of the present invention have found a spectrum of vibration generated by moving an action body while applying a cosmetic on the surface to be coated while bringing the action body into contact with the applied cosmetic. There is a correlation between the data of changes over time and the sensory evaluation of the use of cosmetics.

As shown in FIG. 1, a method for evaluating a tactile sensation of use of a cosmetic according to an embodiment of the invention made by the discovery includes a vibration detecting step (S1) for causing an action body with a side over time The vibration generated by moving the moving body while being applied to the coated surface is detected; the data generating step (S2) generates data on the temporal change of the frequency spectrum of the vibration based on the detected vibration; and the evaluating step (S3), using the generated data to evaluate the feeling of use of the cosmetic.

In the present embodiment, information relating to vibration generated by rubbing or stroking the cosmetic applied to the coated surface is used as an index for evaluating the feeling of use. In other words, as an evaluation index, it is not focused on the bulk characteristics of cosmetics, but on vibrations that are considered to have a great relationship with the touch. Further, in the present embodiment, the data measured in a state close to the state in which the cosmetic is actually used is used. Therefore, the evaluation of the touch feeling of the cosmetics can be performed more accurately.

There are also many cases in which the evaluation method of the feeling of use of cosmetics is carried out by the evaluation panel, and sometimes there is a deviation in the evaluation. By using such an evaluation method in the present embodiment instead of such sensory evaluation, it is possible to more accurately evaluate the use of the tactile sensation.

In the present embodiment, the data used as the evaluation index is specifically information on the temporal change (the change in time series) of the spectrum of the vibration. If the cosmetic is applied to the skin, usually the cosmetic will penetrate into the skin or a part of its ingredients will volatilize in the air, and the physical properties of the cosmetic will change over time. The time and extent of the change over time vary from cosmetic to cosmetic, and the difference in cosmetic properties that changes over time is manifested as a difference in the feel of the use of the cosmetic. Further, the difference in the feeling of use is reflected in the temporal change in the content ratio of the frequency component in the vibration detected when the cosmetic applied to the coated surface is rubbed. Therefore, in the present embodiment, by using the data on the temporal change of the frequency spectrum as an index, it is possible to more accurately grasp the subtle difference in the tactile sensation that is different depending on the cosmetics.

In the present specification, the touch feeling (also referred to as the feeling of use or texture) of the cosmetic is felt when a cosmetic is applied to the skin such as the face or the body or after a predetermined time has elapsed after the cosmetic is applied. feel. Therefore, the tactile sensation to be evaluated by the method of the present embodiment may include the tactile sensation felt when the cosmetic is first brought into contact with the skin and spread, and may also include the feeling of the skin after the cosmetic is spread on the skin for a while. The feeling felt by a finger or palm when touching or rubbing the skin with a finger or palm.

Specific examples of the touch feeling to be evaluated include stickiness, refreshing degree, moistness, soaking feeling, moisturizing, tightness, elasticity, dryness, softness, viscosity, and ductility (or difficulty in stretching). , tender, greasy, sticky and so on.

The cosmetic may include, in addition to the cosmetic (cosmetic) provided as the final product, a cosmetic base, a compound to be formulated to constitute the cosmetic base, and a mixture thereof.

As described above, although there is a correlation between the data on the temporal change of the spectrum of the vibration and the sensory evaluation, the sensory evaluation includes the conventional sensory evaluation regardless of the time axis, and the time of use of the touch. Both the time series sensory evaluations of the evaluation (changes over time) were evaluated. In the evaluation without considering the time axis, the subject was evaluated after a predetermined time elapsed from the start of the application of the cosmetic. Further, in the end, it is possible to obtain one evaluation value (score, etc.) among a plurality of values for one evaluation item for a predetermined cosmetic product by data processing or the like. This sensory evaluation regardless of the time axis can be referred to as a comprehensive evaluation of the feeling of use felt when the cosmetic is applied to the skin. In addition, the completion of the above-mentioned application may be a point in time at which a general amount of the cosmetic is applied, and sometimes it means a point in time when the cosmetic is permeated into the skin to a certain extent. The specific method for evaluating the time axis is not particularly limited, and may be a so-called VAS (Visual Analogue Scale), SD method (Semantic Differential Method), QDA (Quantitative Description Analysis). Analysis) and so on.

On the other hand, in the time series sensory evaluation, the subject is evaluated at two or more time points from the start of the application of the cosmetic to the elapse of a predetermined period of time. Further, the obtained evaluation data may be processed, and the evaluation value may be obtained for one evaluation item for a predetermined cosmetic. The temporal transition of the evaluation value can be expressed, for example, by a graph indicating the time on the horizontal axis and a graph indicating the magnitude of the evaluation value on the vertical axis. In this case, the testee sometimes focuses on one evaluation item for evaluation in one test, and sometimes evaluates a plurality of evaluation items. The time series sensory evaluation is an evaluation method capable of more accurately grasping the characteristics of a cosmetic that is easy to change with time. The time series sensory evaluation is, for example, TDS (Temporal Dominance of Sensations), TCATA (Temporal Check All That Apply), TI (Time Intensity), and the like. In addition, when the sensory evaluation of the time series is performed, the evaluation value of the time series sensory evaluation may be expressed by a Dominance Rate or the like in which the unit is set to a percentage or the like.

In the sensory evaluation, particularly the time series sensory evaluation, when it is desired to improve the accuracy of the evaluation, it may be necessary to select an excellent professional evaluation team or collect a large amount of data, which takes time and cost. On the other hand, according to the evaluation method in the present embodiment, it is also possible to suppress the cost of these time and cost.

<Vibration Detection Step (S1)> In the vibration detection step (S1), the vibration generated by moving the operation body while bringing the operation body into contact with the cosmetic applied on the coated surface is detected with time.

<Generation of Vibration> The vibration detecting step (S1) may include generating a vibration to be detected. The generation of vibration can be performed, for example, by using the vibration generating unit 10 shown in Figs. 2 and 3 . In the illustrated vibration generating unit 10, a predetermined amount of cosmetics is applied to the skin on the inner side of the person's forearm, and vibration is generated by rubbing the applied cosmetic with the inside of the fingertip of a person, for example, the fingertip of the index finger. In other words, the skin on the inner side of the human forearm is used as the coated surface 11, and the index finger is used as the operation body 12, and the action body 12 is reciprocated while contacting the cosmetic body 12 on the coated surface 11 to generate an action body. vibration. In the present specification, the application of the cosmetic means that a predetermined amount of the cosmetic is dropped on a predetermined surface or the like to adhere to a predetermined surface and spread. The means for applying the film is not particularly limited as long as it can form a film of the cosmetic on the surface, and may be a part of a human body such as a finger, or may be a device such as a bristles, a doctor blade, or a sprayer.

The coated surface 11 may be the surface of the human skin shown in Fig. 2, and in this case, it is not limited to the inner side of the arm, and may be the surface of the skin of other human body parts such as the palm, face, neck, body, and the like. The coated surface 11 may be flat or irregular. The coated surface 11 is not limited to the skin of a living person, and as long as it has characteristics similar to or similar to those of a living person, it is possible to use the skin of an animal that has been processed or not processed, artificially manufactured leather, or simulated skin. However, when the surface of the human skin is used as the coated surface 11, it is preferable because vibration can be generated in a state closer to the actual use state.

The action body is a main body that performs a relative operation with respect to the coated surface while being in contact with the cosmetic applied to the surface to be coated. In the example of FIG. 2, although the index finger is used as the action body 12, the action body 12 may be another finger such as a middle finger, or may be another body part such as a palm or an arm. Further, similarly to the coated surface 11, the operating body 12 may be a material having characteristics equivalent to or similar to those of a living person's skin, or may be a member covered with the material.

However, as shown in the illustrated embodiment, when the coated surface 11 and the operating body 12 are each a part of the human body, vibration can be generated in a state close to the state in which the cosmetic is actually used, so that it can be more accurate. The evaluation of the use of the touch is performed. Since the tactile sensation function of the surface (palm side) of the hand is developed in the human body, and the inner surface (the non-nail side) of the fingertip is usually used to recognize the touch feeling, the fingertip is shown in the embodiment as shown in the figure. When the cosmetic body 12 is rubbed with the inner surface of the fingertip, it is possible to obtain more accurate information.

The vibration can be generated by moving the operation body 12 while the operation body 12 is in contact with the cosmetic applied to the surface 11 to be coated. However, the operation of the operation body 12 at this time is an operation capable of generating a detectable vibration. There is no special limit. The action body 12 can be reciprocated with respect to the coated surface 11, or can be moved a plurality of times in one direction. Further, it is possible to move on the coated surface 11 by drawing an arbitrary pattern such as a circle or an ellipse.

(Detection of Vibration) In the vibration detecting step (S1), although vibration is generated by rubbing the cosmetic applied to the surface to be coated, the vibration may be vibration transmitted to the coated surface and/or the operating body. It may also be vibration (sound) that propagates from the surface of the coated surface and/or the moving body via the surrounding medium (air). However, when the vibration transmitted to the coated surface and/or the operating body is detected, it is possible to detect the signal at a position close to the generated portion, and it is also possible to reduce the vibration generated by the situation other than the friction cosmetic. Therefore, from the viewpoint of improving the detection accuracy, it is preferable to detect the vibration transmitted to the coated surface and/or the operating body.

The detecting unit 20 used in the vibration detecting step (S1) may be mounted on the operating body 12 (in the illustrated example, a finger) as shown in FIG. 2 and FIG. 3(a), or may be as shown in FIG. 3(b). ) is mounted on the coated surface 11 as shown. Further, the detecting unit 20 may be attached to both the coated surface 11 and the operating body 12.

The vibration detecting unit 20 is not particularly limited as long as it can detect a signal capable of grasping a change in time spectrum of a spectrum (a spectrum indicating a distribution of frequency components included in the vibration), and may be a displacement or a speed. Or a unit of acceleration that is detected as an electrical signal. As the detecting unit 20, for example, a three-axis acceleration sensor can be used.

In addition, the cosmetic to be applied to the surface to be coated may be one type or two or more types. The first cosmetic may be applied to the coated surface, vibration is generated as described above, and after the vibration is detected, the second cosmetic is applied immediately after or after a predetermined period of time, and vibration is generated as described above to detect the vibration. Further, after the first cosmetic is applied, the generation and detection of vibration may not be performed, and then the second cosmetic may be applied immediately after or after a predetermined time, and vibration is generated as described above to detect the vibration.

In this case, the first cosmetic and the second cosmetic may be the same or different. In the case where the first cosmetic is the same as the second cosmetic, it is possible to evaluate the tactile sensation in the case where the same cosmetic is applied in an overlapping manner. In the case where the first cosmetic is different from the second cosmetic, for example, when the first cosmetic is a lotion or the second cosmetic is an emulsion, it is possible to evaluate the tactile sensation when the different cosmetics are overcoated, and The effect when a plurality of cosmetics were used in combination was evaluated.

<Data Generation Step (S2)> In the data generation step (S2), the signal of the vibration detected in the vibration detection step (S1) is analyzed to generate data on the temporal change of the spectrum of the vibration. Here, the data may be data of a graph or a graph such as a spectrogram, or may be data of a value or a set of values. In addition, the analysis of the vibration signal can be performed by, for example, short-time Fourier transform. With this analysis, it is possible to grasp the temporal change of the vibration including the plurality of frequency components.

(Spectrum map) By the above analysis, it is possible to generate a frequency (in Hz) as a horizontal axis and, for example, a power spectral density for each predetermined elapsed time of a plurality of predetermined elapsed times after applying a cosmetic. The power value per 1 Hz width, in units of dB/Hz, etc.) The magnitude of the vibration of the frequency components is a plurality of spectrograms on the vertical axis. In addition, as schematically shown in FIG. 5, it is possible to generate a spectrogram with respect to a cosmetic product with time as the horizontal axis and frequency as the vertical axis, and showing the power spectral density equal. In the case where the latter spectrogram is generated as data, it is preferable to use a spectrogram for a cosmetic to display a change in the proportion of the frequency component in the vibration over time.

The spectrogram of the latter may be a spectrogram that is divided into different colors according to the value of the vibration magnitude, for example, the magnitude of the power spectral density, and uses the shading of the color to display the distribution of the power spectral density. In addition, it may be a spectrogram in which points having equal power spectral densities are connected in a line as schematically shown in FIG.

The magnitude of the frequency of the analyzed vibration is not particularly limited. According to an embodiment of the present invention, the frequency of the vibration may range from 0 to several MHz, 0 to several tens of KHz, 0 to several KHz, 0 to 1000 Hz, 0~. 500Hz. By setting the frequency range of the analyzed vibration to the above range, it is possible to more accurately evaluate the feeling of use of the cosmetic.

The time during which the vibration is detected from the coated surface of the cosmetic is not particularly limited. For example, vibration detection may be performed within 150 seconds, within 120 seconds, within 90 seconds, within 60 seconds, or within 30 seconds after application of the cosmetic to the coated surface. By setting the detection time to the above range, it is possible to detect a change in vibration accompanying a change in the composition of the cosmetic caused by a part of the component being volatilized or permeated into the surface to be coated.

When the human skin is the coated surface and the human finger is used as the moving body, it is preferable to perform signal detection for about 60 seconds. The detection of the vibration can be carried out continuously during the above time period or intermittently. In addition, the detection of the vibration can be started after a certain period of time after coating, instead of applying the cosmetic to the coated surface. For example, it may be left for 60 seconds after the cosmetic is applied onto the coated surface, and detection is started for 60 seconds from the time of 60 seconds.

(Value Regarding Vibration Size) In the present embodiment, the information on the temporal change of the frequency spectrum of the vibration may be the above-described spectrogram itself, and the tactile sensation of the use of the cosmetic may be evaluated based on the spectrogram. However, the information on the temporal change of the spectrum of the vibration may include data on the magnitude or magnitude of the vibration corresponding to the predetermined elapsed time and the predetermined frequency after the application of the cosmetic, instead of the map of the spectrogram or the like. The spectrum of the vibration may be generated and obtained based on the map, or may be obtained directly from the detected vibration without generating a spectrogram.

The data on the vibration size corresponding to the predetermined elapsed time and the predetermined frequency after the application of the cosmetic may be a value regarding the vibration size corresponding to the predetermined elapsed time and the predetermined frequency after the application of the cosmetic, and the predetermined elapsed time and the predetermined frequency after the application of the cosmetic. The corresponding value regarding the magnitude of the vibration may be one or plural. The value regarding the magnitude of the vibration can be obtained, for example, by the method shown in the flowchart of FIG.

The flow of Fig. 4 is the flow included in the data generation step (S2) in Fig. 3. In the example of FIG. 4, the value regarding the magnitude of the vibration can be divided into a plurality of regions (S2b) by calculating a profile (S2a) indicating a temporal change of the spectrum according to the vibration, and calculating each region. The statistic (S2c) of the power spectral density is obtained.

More specifically, the distribution map shown in FIG. 5 can be generated, that is, a position spectrogram in which the time is the horizontal axis, the frequency is the vertical axis, and the vibration magnitude (for example, the power spectral density) is equal is generated, and the spectrum is generated. The graph is divided into a plurality of regions in a lattice manner, and a statistic about power spectral density in at least one of the plurality of regions is obtained, and the statistic is used as the value regarding the vibration magnitude. In other words, the data as a function of the temporal change of the spectrum obtained in the data generating step (S2) described above may include a predetermined elapsed time period after the cosmetic coating and a statistic regarding the power spectral density in the predetermined frequency band.

Fig. 6 shows an example of the division of the spectrogram shown in Fig. 5. In the example of FIG. 6, the frequency indicated by the vertical axis and the elapsed time indicated by the horizontal axis are divided into four parts, and a total of 16 areas of the regions Z1 to Z16 are formed as a whole. Further, the statistics v ₁ to v ₁₆ regarding the power spectral density can be calculated for the divided regions Z1 to Z16, respectively.

The above statistic may be, for example, at least one of an arithmetic mean value, a geometric mean value (multiplied average value), a median value, a maximum value, and a total value of a power spectroscopy density within a predetermined elapsed time period and a predetermined frequency band after application of the cosmetic product. Wherein, it is preferably at least one of an arithmetic mean value, a geometric mean value, and a median value. In addition, the product of the statistic multiplication or different statistic may also be used as the statistic for the power spectral density in the predetermined elapsed time period after the cosmetic coating and the predetermined frequency band.

It should be noted that, for example, a two-dimensional numerical matrix corresponding to the frequency component and the elapsed time can be obtained in the frequency analysis of the detected vibration, and the numerical matrix can be used to calculate the amount corresponding to the predetermined frequency band and the predetermined time period. , thus getting statistics.

In addition, the statistic may be an integral value (area score) or a center-of-gravity value with respect to the power spectral density within a predetermined elapsed time period and a predetermined frequency band after the cosmetic coating.

In the illustrated example, the spectrogram is divided so as to form a total of 16 regions, but the number and the region of the region obtained by dividing the spectrogram are based on the nature of the cosmetic to be measured or to be evaluated. It is determined by the touch, etc. Specifically, it can be determined based on the region in which the plurality of cosmetics are generated by generating spectrum patterns in the establishment of the evaluation criteria to be described later and comparing them with each other.

In addition, the spectrogram can be segmented in a frequency range (amplitude of the frequency) of one region of 10 to 500 Hz, preferably 50 to 250 Hz, and the time range (time width) of one region can be 5 to 60 seconds. The spectrogram is divided in a manner of preferably 10 to 20 seconds, but the amplitude of the division of the frequency and time is not limited to the above amplitude. The division of the frequency in the spectrogram does not necessarily need to be divided into the same amplitude, and can be appropriately set depending on the characteristics of the touch or the cosmetics to be evaluated. The same is true for the division of time.

It is to be noted that, in the above embodiment, at least one of the predetermined elapsed time period in the spectrogram and the statistic about the power spectral density in the predetermined frequency band is taken as the value regarding the vibration magnitude. However, it is also possible to determine a plurality of vibration magnitudes corresponding to a predetermined elapsed time and a predetermined frequency in the spectrogram, that is, a predetermined elapsed time period and one point in the predetermined frequency band, and use this as the above-mentioned value regarding the vibration magnitude.

Further, in the above embodiment, the spectrogram is generated and the statistic of the power spectral density is calculated from the spectrogram. However, the calculation of the statistic does not necessarily require the generation of the spectrogram. It is also possible to obtain a statistic based on the detected vibration analysis without generating a map.

<Evaluation Step (S3)> In the evaluation step (S3), the feeling of use of the cosmetics is evaluated using the data (spectrum map, value, etc.) generated in the data generation step (S2). In the evaluation, it is preferable to establish an evaluation criterion in advance and perform evaluation based on the criterion.

(Evaluation of the evaluation criteria (the relationship between the data and the sensory evaluation)) As the evaluation criteria, the relationship between the data on the change in the frequency spectrum of the vibration and the sensory evaluation of the coating feeling of the cosmetic is established in advance and saved in advance. Evaluation basis. Specifically, information on changes in the spectrum of vibration over time can be obtained for a plurality of cosmetics, and on the other hand, sensory evaluation is performed on the tactile sensation of each cosmetic, and the relationship between the data and the sensory evaluation is obtained. Library. Further, when the tactile sensation of the use of the unknown cosmetic is evaluated, the above-described relationship with the pre-established relationship can be obtained by the data on the temporal change of the spectrum of the vibration detected by the same method with respect to the unknown cosmetic ( The database was compared to estimate the degree of sensory evaluation of the tactile sensation of the above-mentioned unknown cosmetics.

The sensory evaluation performed for establishing the evaluation criteria may be an evaluation without considering the time axis, or may be a sensory evaluation in time series. In other words, regardless of whether the evaluation of the time axis or the sensory evaluation in the time series is not considered, the cosmetics can be created by pre-establishing a database for the relationship between the information on the time-dependent changes in the spectrum of the vibration for the predetermined cosmetics. The sensory evaluation or sensory evaluation is estimated over time.

A method of obtaining information on changes in the spectrum of vibration over time for a plurality of cosmetics is as described in the above-described vibration detecting step (S1) and data generating step (S2).

In order to obtain an evaluation criterion, a spectrogram (distribution map) in which the time is the horizontal axis and the frequency is the vertical axis and the power spectral density is equal is generated for a plurality of cosmetics, and the spectrogram and sensory evaluation (sensory) are performed. Evaluation value) related. Further, a value regarding the magnitude of the vibration can be directly obtained from the data of the detected vibration, or a value regarding the magnitude of the vibration can be obtained from the obtained spectrum, and the relationship between the value and the sensory evaluation value can be obtained. As a criterion for evaluation, when the relationship between the value of the vibration magnitude and the sensory evaluation is utilized, since the relationship can be expressed as a formula and the formula is used as a model, the evaluation becomes easier.

For example, the relationship between the value regarding the vibration magnitude and the sensory evaluation (evaluation criterion) can be established in the following manner.

For a plurality of known cosmetics, a spectrogram (distribution map) is generated in which the horizontal axis is time, the vertical axis is frequency, and the power spectral density is equal, and the spectrogram is divided into a plurality of regions, and each is calculated and calculated. The value of the area corresponding to the vibration size. The division of the region and the calculation of the value are performed by the same method as the calculation method of the value of the vibration magnitude in the above-described data generation step (S2). In other words, the value regarding the vibration size corresponding to the predetermined elapsed time and the predetermined frequency after the application of the cosmetic is preferably a predetermined elapsed time period after the application of the cosmetic and a statistic regarding the power spectral density in the predetermined frequency band. For example, the statistics v ₁ to v ₁₆ regarding the power spectral density can be calculated for each of the regions Z1 to Z16 shown in FIG. 6 for a plurality of known cosmetics. The statistic may be at least one of an arithmetic mean value, a geometric mean value, and the like, a median value, a maximum value, a total value, and an area score. In addition, a plurality of the statistic may be used for one use touch.

Further, the number of the plurality of cosmetics used for establishing the evaluation criteria may be about 10 to 50, preferably about 20 to 40.

On the other hand, sensory evaluation was performed on one or more use tactile sensations (evaluation items) for each of the plurality of known cosmetics. As described above, the sensory evaluation may be a sensory evaluation regardless of the time axis, or may be a time series sensory evaluation.

The sensory evaluation that does not consider the time axis may be, for example, an evaluation of seven grade scores performed by a trained professional evaluation panel. In the sensory evaluation, a predetermined amount of the cosmetic was placed on the fingertip, and the feeling of the touch felt on the skin of the face was evaluated. The touch is, for example, sticky, refreshing, moisturizing, soaking, moisturizing, tight, elastic, dry, soft, sticky, ductile (or difficult to stretch), tender, greasy, sticky, etc. .

The sensory evaluation performed by the professional evaluation team described above may be an evaluation of the feeling of use felt when the cosmetic is initially contacted with the skin and coated with a finger, or may be felt when the cosmetic is applied and contacted with a finger after a predetermined time. The use of tactile evaluation. The sensory evaluation performed by the professional evaluation team may be an arithmetic mean of evaluations of 2 to 10 persons, and is preferably an arithmetic mean of evaluations of 5 to 10 persons. In addition, the scoring method (the number of evaluation grades, etc.) in a sensory evaluation is not specifically limited.

In order to establish the model formula, for example, using the above-described statistics v ₁ to v ₁₆ obtained for a predetermined one using the tactile sensation and the sensory evaluation scores performed by the professional evaluation team, regression analysis is performed to obtain the value of the statistic. Relationship with sensory evaluation scores. In the model formula, the dependent variable (destination variable) may include a predetermined sensory evaluation score using the tactile sensation, and the self-variable (interpretation variable) may include at least one of the statistics v ₁ to v ₁₆ . In addition, the variable may be a predetermined sensory evaluation score using the tactile sensation, and the self-variable may include at least one of the statistics v ₁ to v ₁₆ .

In the regression analysis, although the predetermined elapsed time period after the application of the cosmetic and the value of the vibration in the predetermined frequency band are used as the self-variable, the other parameters may be used. For example, a value relating to friction including a cosmetic (a value indicating a characteristic regarding friction) or a bulk physical property value of a cosmetic may be added to the self-variable.

The value of the friction of the cosmetic may be, for example, a value based on the frictional force (unit: N) generated by moving the operating body while contacting the working body with the cosmetic applied to the coated surface. For example, the frictional force can be measured over time, and the average value, variance, standard deviation, and the like of the magnitude of the friction force within a predetermined period of time can be set. Further, the difference between the average value, the variance, the standard deviation, the dynamic friction coefficient, and the static friction coefficient of the friction coefficient may be used as the independent variable.

It should be noted that, for example, the frictional force can be generated by the same method as the vibration, and the condition at this time may be the same condition as the vibration, or may be a different condition. Further, the frictional force may be measured simultaneously with the vibration detection when the vibration is generated, or may be measured at a time different from the generation and detection of the vibration.

Further, examples of the physical property value of the cosmetic include, for example, the viscosity of the cosmetic, the first normal stress difference, the wettability, the hardness, and the dynamic viscoelasticity. As the physical property value of the cosmetic, it is preferred to use a physical property value indicating a rheological property.

In the case where the operating body is deformable while moving the operating body into contact with the cosmetic applied to the coated surface, for example, when the operating body is a finger or the like, the operating body may be used. The amount of deformation is used as an independent variable. The amount of deformation may be a change amount of the operating body in the vertical direction with respect to the coated surface, a deformation amount of the operating body in the parallel direction, or a change in the ratio with time, and may be, for example, an average value or a variance within a predetermined period of time. , standard deviation, etc. Specifically, the amount of deformation may be a change with time such as the thickness of the operating body, the contact area with the surface to be coated, and the area in a plan view or a side view. The amount of deformation of the operating body may be measured simultaneously with the vibration detection when the vibration is generated, or may be measured at a time different from the generation and detection of the vibration.

Regression analysis can be linear regression analysis or nonlinear regression analysis. As the linear regression analysis, single regression analysis, multiple regression analysis, and polynomial regression analysis can be cited. As the nonlinear regression analysis, analysis using a neural network or the like can be cited.

The selection of the self-variable can be performed using a stepwise method. In the case of using the stepping method, it is preferable since a more meaningful self-variable can be selected. It should be noted that the regression analysis can be performed using software such as Matlab (registered trademark) manufactured by MathWorks Co., Ltd. or Excel (registered trademark) manufactured by Microsoft Corporation.

The number of the self-variables included in the regression formula (model formula) can be appropriately set depending on the nature of the touch, the nature of the cosmetic, the purpose of evaluation of the cosmetic, and the like, and is not particularly limited. However, in order to reduce the risk of over-learning, the number of independent variables may be about 1 to 5, preferably 1 to 3. In the case where the number of independent variables is plural, a multivariate regression formula is established. It should be noted that the regression formula can be a linear regression formula or a power regression formula. Use the appropriate regression formula according to the type of cosmetics, etc.

In the case of performing regression analysis using linear regression analysis, when the sensory evaluation score estimation value y using the tactile sensation is a dependent variable, the data on the temporal change of the spectrum of the vibration (the above-mentioned statistic z1 to z16) When the value of the friction of the cosmetic, the physical property value of the cosmetic, etc., x ₁ , x ₂ , ..., x _n are independent variables, the obtained linear regression formula is expressed, for example, by the following formula. y=a+b ₁ x ₁ +b ₂ x ₂ +...+b _n x _n (where a is a constant, b ₁ , b ₂ , ..., b _n are normalization coefficients)

It should be noted that although the above coefficient is a normalization coefficient obtained by normalizing each variable, a regression equation in which the coefficient is a partial regression coefficient can be generated.

In the regression formula, the independent variable can be one or plural. At this time, the value regarding the vibration size may include a first value regarding the vibration size corresponding to the first predetermined elapsed time after the cosmetic coating and the first predetermined frequency, and a second predetermined elapsed time after the cosmetic coating and the second The second value corresponding to the magnitude of the vibration corresponding to the predetermined frequency, the independent variable may include the first value and the second value.

Although the tactile sensation evaluated by regression analysis using data on changes in the spectrum of vibration over time is not particularly limited, it can be applied to stickiness, freshness, moistness, soaking, moisturizing, tightness, A sense of elasticity, dryness, softness, etc., is used to establish a meaningful estimation model.

In the present embodiment, the sensory evaluation using the tactile sensation is performed by the professional evaluation team in order to establish the evaluation criteria. However, the evaluation criteria may be established by using the sensory evaluation performed by the professional evaluation team instead of the general user. . When the evaluation criteria are established by the sensory evaluation performed by a general user, the evaluation of the unknown cosmetics can be performed on the basis of the tactile sensation closer to the user's actual feeling. However, since the general user's touch is different from that of the professional evaluation group, it is necessary to collect data of more users than the case where the sensory evaluation by the professional evaluation team is used.

Similarly to the above-described estimation of the sensory evaluation without considering the time axis, in the case where the estimated sensory evaluation in the present embodiment is the time series sensory evaluation, a database can be established. In this case, the entire evaluation period of the time series sensory evaluation, the period from the start of the application of the cosmetic to the passage of the predetermined time (which may include the period from the start of coating to the end of coating, and the period from the end of coating to the passage of the predetermined time) may be employed. The evaluation within the predetermined period is estimated. The estimation of the evaluation within the predetermined period may be an estimation of the representative value of the evaluation within the period. For example, it may be a value of the evaluation value of the representative touch feeling in the early, middle, or late stage among the evaluation periods of the time series sensory evaluation, that is, an estimate representing the evaluation value.

Regarding the representative evaluation value, for example, the time series sensory evaluation is performed by a usual method, the result is represented by a graph, and a graph for one of the evaluation items is extracted. Next, the evaluation period is divided into a plurality of parts, for example, the pre-, mid-, and post-parts. Next, an integral value (area score), a maximum value, an average value (arithmetic mean or geometric mean), a median value, and the like of the evaluation values in the period can be obtained as representative evaluation values in the respective periods.

Further, similarly to the estimation of the sensory evaluation value regardless of the time axis, the statistic v ₁ to v ₁₆ obtained by the vibration detecting and data generating steps and the representative value are used for regression analysis to obtain the statistic and representative evaluation. The relationship between values. In the case where the relationship is expressed using the model formula, the dependent variable (destination variable) may include a representative evaluation value of the predetermined use tactile sensation, and the self-variable (interpretation variable) may include at least one of the statistic v ₁ to v ₁₆ .

(Evaluation of Cosmetics) The regression formula obtained as described above is used as an evaluation criterion for evaluating the feeling of use of cosmetics. In other words, by separately detecting and analyzing the vibration for a plurality of known cosmetics, the sensory evaluation is performed by the professional evaluation team, thereby establishing the evaluation criteria in advance, and on the other hand, by acquiring the data based on the vibration detected for the unknown cosmetics, It is applied to the established evaluation criteria so that the sensory evaluation score of the touch of the unknown cosmetics can be estimated. At this time, vibration detection and data generation of an unknown cosmetic are performed under the same conditions as the vibration detection and data generation performed when the evaluation criteria are obtained.

The cosmetic product to be evaluated in the present embodiment is not particularly limited as long as it can be easily applied to the skin with a finger or the like and can form a thin film on the skin. The bulk form of the cosmetic may be liquid, gel, emulsion, semi-solid or the like. Further, specific examples of the cosmetic to be evaluated include a base cosmetic such as a lotion, an emulsion, and a cosmetic liquid, a foundation before makeup, a foundation, a hand cream, and a body cream.

<Device for Evaluating Tactile Sensitivity of Cosmetics> As shown in FIG. 2 and FIG. 3( a ), the device 1 for evaluating the tactile sensation of use of the cosmetic in the present embodiment includes the vibration detecting unit 20 and changes with time. The vibration generated by moving the operating body 12 while contacting the operating body 12 with the cosmetic applied to the coated surface 11 is detected; the data generating unit 20 generates a time spectrum of the vibration based on the detected vibration. The change data of the change; and the evaluation unit 30 evaluates the touch feeling of the cosmetics using the generated data.

<Method of Selecting Cosmetics> The above-described method for evaluating the feeling of use of the cosmetic and the device for evaluating the feeling of use of the cosmetic can be used for the selection of cosmetics and the like. For example, it can be used in the case of selecting one or more cosmetics having a desired tactile sensation from a group of cosmetics including a plurality of cosmetics having a tactile sensation, or recommending to the customer having the same tactile sensation as desired by the customer. Or the case of using a touch-sensitive cosmetic or the like.

Specifically, an embodiment of the present invention may be a method of selecting a cosmetic, comprising: a first evaluation step of evaluating a touch feeling of the cosmetic C ₀ using a method of evaluating the touch feeling of the cosmetic described above. The second evaluation step is to evaluate the tactile sensations of the plurality of selection target cosmetics C ₁ to C _n (n is an integer) different from the cosmetic C ₀ by using the above method for evaluating the touch feeling of the cosmetic; a comparison step of comparing the tactile sensation of the cosmetic C ₀ with the respective tactile sensations of the plurality of selected subject cosmetics C ₁ to C _n ; and a selecting step from the plurality of selected subject cosmetics C ₁ to C _n A cosmetic that uses the touch with the touch of the cosmetic C ₀ is selected to be the closest. Here, it is preferable that the method of evaluating the touch feeling of the cosmetics used in the first evaluation step and the second evaluation step is the same.

In the above method of selecting a cosmetic, the cosmetic C ₀ may be a cosmetic that the customer or the user likes or uses. Further, the number of the plurality of cosmetics C ₁ to C _n may be, for example, a set of cosmetics to be tried by a user, or a group of cosmetics to be recommended to a user (customer) such as a salesperson. The number of the plurality of cosmetics C ₁ to C _n may be, for example, 2 to 20, preferably 3 to 10.

The touch feeling evaluated in the first evaluation step and the second evaluation step in the above method of selecting a cosmetic is the same. Further, it is also possible to repeat the selection method of the above-mentioned cosmetics in accordance with each different feeling of use. And, as a final selection step, the cosmetics that have been selected the most frequently can be finally selected.

[Examples] [Example 1] Evaluation of cosmetics was carried out using the evaluation device 1 shown in Fig. 2 .

Drop a few drops of known makeup on the skin inside the forearm and spread it. A three-axis acceleration sensor (manufactured by Tecgihan Co., Ltd., model: A3AX) was attached to the side of the index finger of the index finger of the hand on the cosmetic side, and the finger was placed in contact with the surface of the applied cosmetic. A state of 2 N or less is applied to move it. At this time, the fingertip of the index finger is moved at a speed of less than about 30 cm/sec. Immediately after the dropping and spreading of the cosmetic, the above operation was started for 60 seconds, and the vibration during the period was detected by the above-described triaxial acceleration sensor (detecting unit).

The short-time Fourier transform of the vibration detected by the above-described cosmetics was obtained, and a map showing positions at which power spectral densities were equal, which were generated in the same manner as the form shown in Fig. 5, was obtained. At this time, the spectrum map was generated using MATLAB (registered trademark) of MathWorks. The power spectral density in the frequency range of 0 to 500 Hz is shown in the distribution map.

Next, the obtained profile is divided into a plurality of sections. In this example, as shown in FIG. 6, the vertical axis is divided into four parts (dividing the frequency into greater than 0 Hz and less than or equal to 50 Hz, greater than 50 Hz and less than or equal to 100 Hz, greater than 100 Hz and less than or equal to 250 Hz, greater than 250 Hz, and less than or equal to 500 Hz. Part 4), splitting the horizontal axis (dividing time into greater than 0 seconds and less than or equal to 10 seconds, greater than 10 seconds and less than or equal to 20 seconds, greater than 20 seconds and less than or equal to 40 seconds, greater than 40 seconds and less than or equal to 60 seconds The 4 parts) form the area of Z1~Z16 in the spectrogram. Next, the arithmetic mean value of the power spectral density is obtained in each region, and each value is referred to as v ₁ to v ₁₆ .

The above-described vibrations were detected and analyzed for a total of 20 known cosmetics, and arithmetic mean values v ₁ to v _{16 were} obtained for each of the cosmetics. On the other hand, for each of the above-mentioned plurality of cosmetics, sensory evaluation of the feeling of use "smoothness" when the cosmetic was first brought into contact with the skin and applied. The sensory evaluation was performed based on the scores of the comparative comparisons with the control samples obtained by the professional evaluation team.

Then, using the above-mentioned values v ₁ to v ₁₆ and the sensory evaluation scores of the "cleanness" obtained by the professional evaluation team, a linear regression analysis was performed using Matlab (registered trademark) manufactured by MathWorks Co., Ltd. to obtain a regression formula. The selection of the independent variable based on the values v ₁ to v ₁₆ is performed by a step method. Thus, the formula S=-0.949*v ₁₄ in which the estimated score S using the tactile “clearness degree” is the dependent variable and v ₁₄ among the values v ₁ to v ₁₆ is the independent variable is obtained (returning each variable) Analyze and analyze). This means can be based on the size and the predetermined time v _14-band frequency components within a predetermined frequency band to be a meaningful evaluation score instructions sensory feel "freshness" of.

Fig. 7 shows the relationship between the evaluation value (estimated value) S estimated from the above-described regression formula and the sensory evaluation value S ₀ obtained by the professional evaluation panel. The estimated value S is a value obtained by substituting v ₁₄ into the above regression formula for each of a plurality of known cosmetics. As shown in FIG. 7, each of the plots is arranged on a proportional straight line having an inclination of approximately 1. As a result, it is possible to confirm that the estimated value S calculated based on the regression equation obtained by the linear regression analysis is the value S ₀ close to the sensory evaluation score of the professional evaluation group.

The feeling of use of an unknown cosmetic can be evaluated by using the evaluation criteria established as described above. At this time, with respect to the feeling of use of the unknown cosmetics, vibration detection and data generation were performed under the same conditions as those performed in the establishment of the evaluation criteria. Thus, by substituting the value v ₁₄ obtained from the analysis of the unknown cosmetic into the above formula S=-0.949*v ₁₄ , it is possible to obtain an estimated value of the sensory evaluation score of the touch feeling of the unknown cosmetic.

[Embodiment 2] As in the first embodiment, the vibration is detected and analyzed, and the arithmetic mean value of the power spectral density is obtained in each of the regions Z1 to Z16 of the spectrogram, and each value is referred to as v ₁ to v ₁₆ . The above-described vibrations were detected and analyzed for a total of 21 known cosmetics, and values v ₁ to v _{16 were} obtained for each of the cosmetics. On the other hand, in the same manner as in the first embodiment, the sensory evaluation by the professional evaluation panel regarding the use of the touch "stickiness" was performed for each of the plurality of known cosmetics.

Next, linear regression analysis was performed in the same manner as in Example 1 except that the touch was "sticky", and a linear regression formula was obtained. Thus, the formula S=-0.929*v ₁₀ in which the estimated score S using the tactile "stickiness" is the dependent variable and v ₁₀ among the values v ₁ to v ₁₆ is the independent variable is obtained. This means that the sensory evaluation score using the tactile "stickiness" can be meaningfully explained based on the predetermined time zone of v ₁₀ and the magnitude of the frequency component within the predetermined frequency band.

The relationship between the evaluation value (estimated value) S and the sensory evaluation value S ₀ obtained by the professional evaluation panel is estimated based on the above regression formula. The estimated value S is a value obtained by substituting v ₁₀ for the plurality of known cosmetics into the above regression formula. As shown in FIG. 8, each of the plots is arranged on a proportional line having an inclination of approximately 1. Thus, it can be confirmed that the estimated value S calculated based on the regression equation obtained by the above linear regression analysis is the value S ₀ close to the sensory evaluation score of the professional evaluation group.

The feeling of use of an unknown cosmetic can be evaluated by using the evaluation criteria established as described above. At this time, with respect to the feeling of use of the unknown cosmetics, vibration detection and data generation were performed under the same conditions as those performed in the establishment of the evaluation criteria. Thus, by substituting the value v ₁₀ obtained from the analysis of the unknown cosmetic into the above formula S=-0.929*v ₁₀ , it is possible to obtain an estimated value of the sensory evaluation score of the touch feeling of the unknown cosmetic.

[Example 3] In Examples 1 and 2, the skin on the inner side of the forearm was the coated surface, and the fingertip of the index finger was used as the action body. In other words, the human body is used as the vibration generating unit 10 in the first and second embodiments. In the third embodiment, synthetic leather (manufactured by Komatsu Seiko Co., Ltd., trade name: Supplare (registered trademark)) was used as the coated surface in the vibration generating unit 10. Specifically, the synthetic leather was adhered to the flat surface of the surface, and the cosmetics were dropped and spread in the same manner as in Example 1, and vibration detection was performed in the same manner as in Examples 1 and 2. It should be noted that in the third embodiment, the time for moving the finger movement is 90 seconds immediately after the dropping and coating of the cosmetic.

In the same manner as in the first embodiment, a spectrogram (profile) showing positions at which the power spectral density is equal is obtained. Then, as in the first embodiment, the average value of the power spectral density is obtained in each of the regions divided in the spectrogram. For each of the values v ₁ to v ₁₆ , for the horizontal axis of the spectrogram, the time interval is divided into greater than 0 seconds and less than or equal to 15 seconds, greater than 15 seconds and less than or equal to 30 seconds, greater than 30 seconds, and less than or equal to 45 seconds, greater than 4 parts of 45 seconds and less than or equal to 90 seconds.

In the same manner as in the second embodiment, the sensory evaluation was performed by the professional evaluation team for the use of the tactile "sticky", and the linear regression analysis was performed using the above values v ₁ to v ₁₆ and the sensory evaluation values obtained by the professional evaluation team to obtain a linear regression. formula. Thus, the formula S=-0.675*v ₁₄ -0.309* in which the estimated score S of the touch feeling "sticky" is used as the dependent variable and v ₁₄ and v ₄ among the values v ₁ to v ₁₆ are the independent variables is obtained. v ₄ . This means that the sensory evaluation score using the tactile "sticky" can be meaningfully explained based on the predetermined time bands of v ₁₄ and v ₄ and the magnitude of the frequency components within the predetermined frequency band.

The relationship between the evaluation value (estimated value) S and the sensory evaluation value S ₀ obtained by the professional evaluation panel is estimated based on the above regression formula. The estimated value S is a value obtained by substituting v ₁₄ and v ₄ into the above regression formula for a plurality of known cosmetics. As shown in FIG. 9, each of the plots is arranged on a proportional straight line having an inclination of approximately 1. Thus, it can be confirmed that the estimated value S calculated based on the regression equation obtained by the above linear regression analysis is the value S ₀ close to the sensory evaluation score of the professional evaluation group.

The feeling of use of an unknown cosmetic can be evaluated by using the evaluation criteria established as described above. At this time, with respect to the feeling of use of the unknown cosmetics, vibration detection and data generation were performed under the same conditions as those performed in the establishment of the evaluation criteria. Thus, by substituting v ₁₄ and v ₄ among the values obtained by the analysis of the unknown cosmetics into the above formula S=-0.675*v ₁₄ - 0.309*v ₄ , it is possible to obtain the touch of the unknown cosmetic. Estimated value of sensory evaluation scores.

[Embodiment 4] Embodiment 4 is an example of a case where the sensory evaluation is a time series sensory evaluation, and a model formula for estimating the time series sensory evaluation is generated.

The generation and detection of vibration were performed in the same manner as in the first embodiment. Next, in the same manner as in the first embodiment, the vibration is analyzed, and the arithmetic mean value of the power spectral density in each of the regions Z1 to Z16 of the spectrogram is obtained, and each value is v ₁ to v ₁₆ . The above-described vibrations were detected and analyzed for a total of six known cosmetics, and values v ₁ to v _{16 were} obtained for each of the cosmetics.

On the other hand, time series sensory evaluation was performed by 40 people of the general evaluation group for the above-mentioned plural known cosmetics by the TCATA method. More specifically, when the test subject starts to apply the cosmetic, the test subject selects one or more touch feelings that are felt from the plurality of touch feelings (sensory evaluation items) at any time, and the feeling disappears at any time. Use touch. The selection of the item and the input of the release are performed by the input device of the computer, and the input result can be displayed on the display device of the computer. In the present embodiment, the evaluation items are four items of "sticky", "easy to stretch", "sweet" and "sticky".

Next, using the software (sensory evaluation software FIZZ, manufactured by BIOSYSTEMS), the data input to the computer is processed by the processing device of the computer. In the data processing, the proportion of the subjects who have selected the tactile sensations is calculated per unit time and used as the dominance, and is plotted over time, and the results are displayed as a graph. It should be noted that, for a predetermined use touch, at a certain moment, if all the testees select the touch feeling, the dominance is 100%, and if the test subject using the touch is not selected, the advantage is The degree is 0%.

Figure 10 shows the above results. In the graph of Fig. 10, the horizontal axis is time (seconds) and the vertical axis is dominance (%). The transition of the sensory evaluation regarding the time series of each use tactile sensation is shown. In this example, a graph using tactile "sticky" is extracted from a plurality of graphs using tactile sensations with respect to the illustration. Fig. 11 shows a graph after the extraction.

Further, the graph of Fig. 11 is divided into three parts along the time axis direction, which are the pre-, mid-, and post-stage, respectively. Since the evaluation period is 100 seconds in total, each period in the early, middle, and late stages is 33 seconds. Next, a representative evaluation value of the "feel" of the touch feeling in each period was obtained. In the present example, the average values P _a4 , P _{b4 ,} and P _c4 of the dominance of each period are obtained as representative evaluation values, respectively, and are representative evaluation values for the respective periods.

In the fourth embodiment, the model formula is obtained using the later average value P _c4 among the representative evaluation values and the obtained values v ₁ to v ₁₆ described above. The model formula was obtained by regression analysis using Matlab (registered trademark) manufactured by MathWorks Co., Ltd., which is the same as Example 1. The selection of the self-variable from the values v ₁ to v ₁₆ was also carried out by the step method in the same manner as in the first embodiment.

Therefore, the formula P _c4 =-41.733*(logv ₆ )-228.93 with the average value P _c4 as the representative evaluation value in the latter part of the evaluation period as the dependent variable and v ₆ among the values v ₁ to v ₁₆ as the independent variable is obtained. (R ² =0.7109). From this, it can be seen that the later evaluation of the evaluation period in the TCATA method using the tactile "sticky" can be meaningfully explained based on the size of the frequency component in the predetermined time band and the predetermined frequency band. The relationship between P _c4 and logv ₆ is shown graphically in FIG.

By establishing the evaluation criteria in this way and storing them in advance, it is possible to estimate the evaluation within the predetermined evaluation period of the time series sensory evaluation of the use feeling of the unknown cosmetics. At this time, with respect to the feeling of use of the unknown cosmetics, vibration detection and data generation were performed under the same conditions as those performed in the establishment of the evaluation criteria. By substituting v ₆ among the values obtained by the analysis of the unknown cosmetics into the above-described model formula, it is possible to evaluate the period of use during the time series sensory evaluation of the unknown cosmetics. The representative value (average of dominance) in the later period is estimated.

[Embodiment 5] As in the case of the fourth embodiment, acquisition, analysis, time series sensory evaluation, and the like of the spectrum of the vibration are performed. However, in Embodiment 5, a model formula for using the tactile "stickiness" is generated instead of using the tactile "sticky".

A graph using the tactile "adhesive" was extracted from the graph of the time series sensory evaluation (Fig. 10) obtained in the same manner as in the fourth embodiment. In the same manner as in the fourth embodiment, the graph was divided into three parts in about 33 seconds, which were the previous, middle, and late stages. Next, a representative evaluation value of the touch feeling "adhesive feeling" in each period was obtained. In the present example, the average values P _a5 , P _{b5 ,} and P _c5 of the dominance of each period are respectively obtained as representative evaluation values in the respective periods. Fig. 13 shows a graph after the extraction.

The model formula is obtained using the previous average value P _a5 among the representative evaluation values and the obtained values v ₁ to v ₁₆ described above. The method for determining the model formula is the same as that of the fourth embodiment. Therefore, the formula P _a5 = -16.248*(logv ₆ )-89.607 (R ² =0.839) is obtained. From this, it can be seen that the later evaluation of the evaluation period in the TCATA method using the tactile "stickiness" can be meaningfully explained based on the size of the frequency component in the predetermined time band and the predetermined frequency band. The relationship between P _a5 and logv ₆ is shown by a graph in FIG.

The model formula thus established can be saved in advance as an evaluation criterion. As a result, the use of the unknown cosmetics is detected by vibration and data generation under the same conditions as those performed in the establishment of the evaluation criteria, and the values obtained from the analysis of the unknown cosmetics are obtained. The v ₆ in the above is substituted into the above-described model formula, and it is possible to estimate the representative value (the average value of the dominance) in the previous period of the evaluation period using the tactile "stickiness" in the time series sensory evaluation of the unknown cosmetic.

The present application claims priority to Japanese Patent Application No. 2017-162104, filed on-

1‧‧‧Evaluation device

10‧‧‧Vibration generating unit

11‧‧‧ coated surface

12‧‧‧Action body

15‧‧‧ Cosmetics

20‧‧‧Vibration detection unit

30‧‧‧ data generation unit

40‧‧‧Evaluation unit

1 is a flow chart showing a method in an embodiment of the present invention. Fig. 2 is a schematic view of a device in an embodiment of the present invention. 3(a) and 3(b) are schematic enlarged views of the vibration generating unit and the vibration detecting unit. 4 is a flow chart showing a specific example of a data generation step. FIG. 5 is a diagram schematically showing an example of a spectrum distribution map for indicating a change in frequency spectrum over time. FIG. 6 is a diagram for explaining data generation based on a spectrum distribution map for indicating a change in frequency over time. Fig. 7 is a graph showing the correlation between the evaluation value S and the evaluation value S ₀ obtained by sensory evaluation based on the regression formula in the first embodiment. 8 is a graph showing the correlation between the evaluation value S and the evaluation value S ₀ obtained by sensory evaluation based on the regression formula in the second embodiment. FIG. 9 is a graph showing the correlation between the evaluation value S and the evaluation value S ₀ obtained by sensory evaluation based on the regression formula in the third embodiment. Fig. 10 is a graph showing the results of time series sensory evaluation in the fourth embodiment. Fig. 11 is a graph regarding the use tactile sensation evaluated in Example 4 extracted from Fig. 10. Fig. 12 is a graph showing the correlation between the predetermined statistic value in the fourth embodiment and the representative value of the sensory evaluation of the later "sticky". Fig. 13 is a graph regarding the use tactile sensation evaluated in Example 5 extracted from the graph of Fig. 10. Fig. 14 is a graph showing the correlation between the predetermined statistical value in the fifth embodiment and the representative value of the sensory evaluation of the "adhesive feeling" in the previous stage.

Claims (13)

A method for evaluating a feeling of use of a cosmetic, comprising: a vibration detecting step of detecting a vibration generated by moving the operating body while contacting the working body with the cosmetic applied to the coated surface over time; The data generating step generates data on the temporal change of the spectrum of the vibration based on the detected vibration; and an evaluation step of evaluating the touch feeling of the cosmetic using the generated data. According to the method of claim 1, wherein in the evaluation step, the relationship between the information on the temporal change of the spectrum of the vibration obtained in advance and the sensory evaluation of the touch of the use of the cosmetic is applied to the cosmetic Use the touch to evaluate. The method of claim 2, wherein the information on the temporal change of the spectrum of the vibration includes a value regarding the vibration magnitude corresponding to a predetermined elapsed time and a predetermined frequency after the cosmetic coating. The method of claim 3, wherein the value regarding the magnitude of the vibration comprises a statistic of a predetermined elapsed time period after the cosmetic coating and a power spectral density within the predetermined frequency band. The method of claim 4, wherein the statistic is an arithmetic mean value, a geometric mean value, a median value, a maximum value, and a total value of the power spectral density within a predetermined elapsed time period and a predetermined frequency band after the cosmetic coating at least one. The method of claim 3, wherein the relationship is given by a regression formula in which the independent variable includes the value regarding the magnitude of the vibration, and the variable includes a sensory evaluation of the tactile sensation of the use of the cosmetic. The method of claim 6, wherein the value regarding the vibration size includes a first value regarding the vibration size corresponding to the first predetermined elapsed time and the first predetermined frequency after the cosmetic coating, and a second predetermined after the cosmetic coating The elapsed time corresponds to a second value of the magnitude of the vibration corresponding to the second predetermined frequency, the independent variable including the first value and the second value. The method of claim 6, wherein the independent variable further comprises at least one of a viscosity of the cosmetic, a first normal stress difference, a deformation amount of the action body, and a value of the cosmetic regarding friction. The method of claim 1, wherein in the vibration detecting step, the vibration transmitted to the coated surface and/or the operating body is detected. The method of claim 2, wherein the sensory evaluation of the touch of the cosmetic comprises a time series sensory evaluation. The method of claim 10, wherein the sensory evaluation of the touch of the cosmetic is a representative value of the evaluation within the predetermined period of the time series sensory evaluation. An apparatus for evaluating a feeling of use of a cosmetic, comprising: a vibration detecting unit that detects a vibration generated by moving the operating body while bringing the operating body into contact with the cosmetic applied on the coated surface over time; The data generating unit generates data on the temporal change of the spectrum of the vibration based on the detected vibration, and an evaluation unit that evaluates the touch feeling of the cosmetic using the generated data. A method for selecting a cosmetic, comprising: a first evaluation step of evaluating a touch feeling of a cosmetic using a method of evaluating a touch feeling of a cosmetic according to item 1 of the request; a second evaluation step of using the The method of evaluating the feeling of use of the cosmetic used in the first evaluation step, respectively, evaluating the touch feeling of the plurality of selected cosmetics different from the cosmetic; the comparison step, the touch feeling of the cosmetic and the Comparing the respective tactile sensations of the plurality of selected subject cosmetics; and a selecting step of selecting a cosmetic having the tactile sensation closest to the use feeling of the cosmetic from among the plurality of selected subject cosmetics.