Application pressure evaluation method, application pressure evaluation system, and method for setting appropriate range in application pressure evaluation system

Abstract

The application pressure evaluation method according to an embodiment of the present invention comprises: a detection step of using a measuring device installed on the user's upper arm, forearm, or wrist, to detect, according to changes in a measured value, an application pressure when a user is applying by hand a cosmetic on the face; a comparison step of comparing whether or not a value determined from the detected measured value is within a suitable range; and a notification step of notifying the user whether the value determined from the measured value falls within or outside of the suitable range.

Description

[Technical Field]

[0001] The present invention relates to an application pressure evaluation method for evaluating the application pressure when a user applies cosmetics to the face with their hands, an application pressure evaluation system including an application pressure measuring device and an information processing device, and a method for setting an appropriate range in the application pressure evaluation system. [Background technology]

[0002] In recent years, Non-Patent Document 1 has proposed that the emotions evoked by touch differ between hairless parts of the human body, such as the fingers, palms, and soles, and hairy parts, such as the arms and face, and that stroking hairy parts with a specific pressure and speed evokes a pleasant feeling of comfort.

[0003] Furthermore, Patent Document 1 discloses that a pleasant feeling is evoked by the tactile sensation of stroking the arm with appropriate pressure and speed, and that the pleasant feeling improves the texture of the skin.

[0004] However, the appropriate stroking sensations described in Non-Patent Document 1 and Patent Document 1 were achieved by strokes operated by a fixed external device, not by human hands. Therefore, even if it was found that they evoked positive emotions, it was difficult to reproduce them by oneself. Furthermore, evaluations in these experiments required taking samples such as blood from the subjects, which made real-time evaluation impossible.

[0005] On the other hand, in order to detect finger movements and measure pressure strength, a configuration in which a tactile detection unit is provided over the entire palm as shown in FIG. 1A (Patent Document 2), a configuration in which sensors are provided on the fingertips as shown in FIG. 1B (Patent Document 3), and a configuration in which sensors are provided on the upper and side surfaces of the fingers as shown in FIG. 1C (Patent Document 4) have been disclosed.

[0006] Furthermore, Patent Document 5 proposes making the sensor into a conductive film and using it as a flexible sensor device for the body surface that is worn on the hand or the like. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Publication No. 2019-105619 [Patent Document 2] Japanese Patent Application Laid-Open No. 2008-032511 [Patent Document 3] Re-tabled publication 2017 / 175868 [Patent Document 4] Japanese Patent Application Laid-Open No. 2013-003782 [Patent Document 5] Patent No. 6292665 [Non-patent literature]

[0008] [Non-Patent Document 1] Coding of pleasant touch by unmyelinated afferents in humans / Volume 12 / number 5 / May 2009 natural neuroscience Summary of the Invention [Problem to be solved by the invention]

[0009] However, in the configurations of Patent Documents 2 to 4 and Patent Document 5 shown in FIGS. 1A to 1C, the sensors are provided directly on the fingers or hands. For example, when the sensor is worn on the hand and the user touches the skin of a person's face or other area with hair in order to induce a pleasant feeling, the contact with the sensor induces an unpleasant feeling in the skin at the contact point.

[0010] Furthermore, if the sensor is made into a film and attached to the surface of the hand as in Patent Document 5, and this sensor is used to evaluate contact when applying cosmetics, etc., there is a risk that the film constituting the sensor will dissolve depending on the ingredients of the cosmetics used.

[0011] In view of the above circumstances, the present invention aims to provide an application pressure evaluation method that can evaluate the pressure applied to the face by the fingertips or hands in real time without providing sensors on the fingertips or hands. [Means for solving the problem]

[0012] In order to solve the above problem, one aspect of the present invention is an application pressure evaluation method that includes a detection step of detecting, using a measuring device attached to the user's upper arm, forearm, or wrist, the application pressure when the user applies cosmetics to their face with their hand, based on changes in the measurement value; a comparison step of comparing the value calculated from the detected measurement value to determine whether it is within an appropriate range; and a notification step of notifying the user whether the value calculated from the measurement value is within or outside the appropriate range. [Effects of the Invention]

[0013] According to one aspect, the application pressure evaluation method makes it possible to evaluate the pressure applied to the face by the fingertips or hands in real time without providing sensors on the fingertips or hands. [Brief explanation of the drawings]

[0014] [Figure 1A] FIG. 10 is a diagram showing an example of a sensor for measuring pressure and movement of a fingertip or hand in a conventional example. [Figure 1B] FIG. 10 is a diagram showing an example of a sensor for measuring pressure and movement of a fingertip or hand in a conventional example. [Figure 1C] FIG. 10 is a diagram showing an example of a sensor for measuring pressure and movement of a fingertip or hand in a conventional example. [Figure 2] FIG. 1 is a schematic diagram of a coating pressure evaluation system according to a first embodiment. [Figure 3] FIG. 2 is a functional block diagram of the application pressure evaluation system according to the first embodiment. [Figure 4] 10 is a flowchart showing a process for evaluating the application pressure to the face when using the application pressure evaluation system according to the first embodiment. [Figure 5] 10A to 10C are diagrams illustrating an example of a pressing method when setting an appropriate range used in the application pressure evaluation flow according to the first embodiment. [Figure 6] FIG. 10 is a functional block diagram of the analysis system when setting an appropriate range used in the application pressure evaluation flow according to the first embodiment. [Figure 7] 4 is a measurement and analysis flowchart for setting an appropriate range in the coating pressure evaluation system according to the first embodiment. [Figure 8] This table shows the RMS change rate of the EMG amplitude when multiple subjects pressed their faces with three different strengths: weak, normal, and strong, as well as the subject's subjective impression, cheek moisture content, and amount of water evaporation. [Figure 9A] FIG. 10 is a graph showing the correlation between the RMS change rate of the forearm myoelectric potential amplitude and comfort level when using different pressing strengths. [Figure 9B] FIG. 10 is a diagram showing the distribution of the number of people when an appropriate range is set. [Figure 10A] This figure shows the correlation between preference and the RMS change rate of the forearm EMG amplitude after pressing with different strengths. [Figure 10B] FIG. 10 is a diagram showing the distribution of the number of people when an appropriate range is set. [Figure 11] This figure shows the correlation between the RMS change rate of the forearm's EMG amplitude when pressing with normal strength and the moisture content of the cheek. [Figure 12] This figure shows the correlation between the RMS change rate of the forearm's EMG amplitude when pressing with normal strength and the amount of water evaporation from the cheek. [Figure 13A] 10A to 10C are diagrams illustrating hand movements in an example of the stroke method when setting an appropriate range used in the application pressure evaluation flow according to the first embodiment. [Figure 13B] FIG. 10 illustrates an example of a hand pressure trajectory on the face. [Figure 14] FIG. 10 is a graph showing the correlation between the RMS change rate of the myoelectric potential amplitude of the forearm and the amount of water evaporation from the cheek when a cosmetic material is applied using the stroke method. [Figure 15A] FIG. 10 is a graph showing the RMS change rate of the myoelectric potential amplitude over time when a cosmetic material is applied alone and when a beauty serum is applied first and then the cosmetic material is applied, using the stroke method. [Figure 15B]FIG. 10 is a graph showing the average value of the RMS rate of change over the entire application time when a cosmetic material is applied alone and when a cosmetic material is applied after a beauty serum is applied, using the stroke method. [Figure 16] FIG. 1 is a schematic diagram illustrating an application pressure evaluation system according to a first embodiment when used by an individual. [Figure 17] FIG. 10 is a schematic diagram illustrating a case where a beauty professional uses the application pressure evaluation system according to the first embodiment to instruct a customer on application pressure. [Figure 18] 1 is a schematic diagram illustrating a case where a professional beauty instructor is instructing beauty staff using the application pressure evaluation system according to the first embodiment. FIG. [Figure 19] FIG. 10 is a schematic diagram of a coating pressure evaluation system according to a second embodiment. [Figure 20] FIG. 10 is a functional block diagram of an application pressure evaluation system according to a second embodiment. [Figure 21] 10 is a flowchart showing a process for evaluating the application pressure to the face when using the application pressure evaluation system of the second embodiment. [Figure 22A] This is the acceleration waveform when pressing with normal force. [Figure 22B] This is the acceleration waveform when pressing with about half the usual force. [Figure 22C] This is the acceleration waveform when pressing with twice the usual force. [Figure 22D] This is the acceleration waveform when pressing with the most comfortable force. [Figure 23A] This is the frequency power spectrum when pressing with normal force. [Figure 23B] This is the frequency power spectrum when pressing with about half the usual force. [Figure 23C] This is the frequency power spectrum when pressing with about twice the usual force. [Figure 23D] This is the frequency power spectrum when pressing with the most comfortable force. DETAILED DESCRIPTION OF THE INVENTION

[0015] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following describes embodiments of the present invention with reference to the accompanying drawings. In the following drawings, the same components are designated by the same reference numerals, and redundant explanations may be omitted.

[0016] The present invention relates to an application pressure evaluation method for evaluating the application pressure when a user applies cosmetics to the face with their hands, an application pressure evaluation system including an electromyometer and an information processing device, and a method for setting an appropriate range in the application pressure evaluation system.

[0017] [First embodiment] <Outline of the coating pressure evaluation system> First, a coating pressure evaluation system 10 according to a first embodiment will be described with reference to Fig. 2 and Fig. 3. Fig. 2 is a schematic diagram of the coating pressure evaluation system 10 according to the first embodiment. Fig. 3 is a functional block diagram of the coating pressure evaluation system 10 according to the first embodiment.

[0018] In the first embodiment, the application pressure is measured by an electromyometer. An application pressure evaluation system 10 according to the first embodiment includes an electromyometer 1 and an information processing device 2. In this embodiment, an example will be described in which the electromyometer 1 is used as a measuring device to detect the application pressure based on changes in myoelectric potential (measured value), but the measuring device and the measured value are not limited to this.

[0019] As shown in Fig. 2, an electromyograph (EMG) 1 is attached to the forearm of a user, and detects the application pressure when the user applies cosmetics to the face with their hands by measuring changes in the myoelectric potential of the forearm. As shown in Fig. 2, the electromyograph 1 is preferably attached to the inside of the forearm, near the pronator teres or palmaris longus muscle, near the crease on the inside of the elbow. The pronator teres or palmaris longus muscle of the forearm are areas where the myoelectric potential changes in response to movement of the hand (the portion from the wrist to the fingertips).

[0020] The information processing device 2 is capable of communicating with the electromyograph 1, can acquire myoelectric potential from the electromyograph 1, and evaluates and notifies the application pressure based on the myoelectric potential. This information processing device 2 is an information processing terminal for evaluation, and is, for example, a smartphone, tablet, mobile phone, or laptop computer, which is capable of outputting audio and / or images. Alternatively, it may be an information processing terminal dedicated to this application pressure evaluation system 10. The information processing device 2 shown in FIG. 2 is an information processing device for evaluation.

[0021] In the application pressure evaluation system 10, a speaker, a projector, or the like may be connected to the information processing device 2, and in that case, the notification function may be performed by voice from the speaker or by a projected image from the projector.

[0022] Communication between the information processing device 2 and the electromyograph 1 is realized by, for example, Bluetooth (registered trademark), infrared communication, Wi-Fi (registered trademark), or the like.

[0023] 3, the information processing device 2 includes a myoelectric potential acquiring unit 21, an RMS calculating unit 22, a resting RMS value temporary storing unit 23, an RMS change rate calculating unit 24, an appropriate range storing unit 25, a comparing unit 26, an audio output unit 27, and a display unit 28. The audio output unit 27 and the display unit 28 together constitute a notification unit 29.

[0024] The myoelectric potential acquiring unit 21 is an acquiring unit that acquires myoelectric potential, and acquires the myoelectric potential measured by the electromyograph 1 through communication.

[0025] After acquiring the myoelectric potential, the RMS calculation unit 22 calculates the root mean square (RMS) of the amplitude of the myoelectric potential.

[0026] The resting RMS value temporary storage unit 23 temporarily stores the RMS of the amplitude of the myoelectric potential at rest.

[0027] After acquiring the myoelectric potential during application, the RMS change rate calculation unit 24 calculates the rate of change in the RMS of the amplitude of the myoelectric potential compared to the RMS of the amplitude of the myoelectric potential at rest. Since the amplitude in an electromyogram (EMG) is a relative value, by using the RMS change rate (%) (ΔRMS) during application relative to the RMS value at rest, it is possible to treat such types of electromyographs equally. The RMS calculation unit 22 and the RMS change rate calculation unit 24 are calculation units.

[0028] The appropriate range storage unit 25 is a storage unit that stores an appropriate range of the RMS rate of change in advance.

[0029] The comparison unit 26 compares whether the RMS change rate calculated from the acquired myoelectric potential is within an appropriate range.

[0030] Based on the comparison result of the comparison unit 26, the notification unit 29 notifies whether the RMS change rate of the myoelectric potential, which is a value calculated from the acquired myoelectric potential, is within or outside an appropriate range.

[0031] When the notification is made by voice, the voice output unit 27 notifies by voice whether the RMS change rate of the detected myoelectric potential is within or outside the appropriate range. In the case of voice, the notification may be made only when the RMS change rate is outside the appropriate range, or only when it is within the appropriate range.

[0032] When notifying by display, the display unit 28, for example, a display, displays the RMS change rate (%) of the amplitude of the myoelectric potential and the value of the appropriate range superimposed on each other. The display may be, for example, a liquid crystal display panel, an organic EL (Electro-luminescence) or OLED (Organic Light Emitting Diode) display panel, etc.

[0033] Furthermore, the notification by the notification unit 29 may be a combination of visual notification and audio notification.

[0034] In the information processing device 2, the functions of the RMS calculation unit 22, the resting RMS value temporary storage unit 23, the RMS change rate calculation unit 24, the appropriate range storage unit 25, and the comparison unit 26 are incorporated into a program such as an app, and can be executed by launching the app.

[0035] In addition, although not shown in the figure, the information processing device 2 also includes electronic components, such as a CPU (Central Processing Unit), RAM (Random Access Memory), ROM (Read Only Memory), HDD (Hard Disk Drive), input / output interface, and internal bus, which perform information processing related to basic operations.

[0036] (Application pressure evaluation flow) Next, an application pressure evaluation method in the application pressure evaluation system 10 will be described with reference to Figures 2 to 4. Figure 4 shows a flow chart for evaluating the application pressure on the face when using the application pressure evaluation system according to the first embodiment.

[0037] In S1, as preparation, the application of the information processing device 2 is launched and the electromyograph 1 is attached to the forearm of the user. At this time, the electromyograph 1 measures the myoelectric potential at rest and transmits it to the information processing device 2.

[0038] In S2, the information processing device 2 calculates the RMS value of the myoelectric potential at rest.

[0039] In S3, the user begins applying the cosmetic to the face with their hands.

[0040] In S4, the electromyograph 1 measures the myoelectric potential of the forearm and transmits the measured myoelectric potential to the information processing device 2 in real time.

[0041] In S5, the calculation units 22 and 24 of the information processing device 2 calculate the RMS rate of change of the amplitude of the acquired myoelectric potential. The process up to this point is defined as the detection step.

[0042] In S6, the comparison unit 26 of the information processing device 2 compares the RMS change rate of the amplitude of the myoelectric potential with the stored appropriate range (comparison step).

[0043] In S7, strength information based on the result of comparing the RMS rate of change with the appropriate range is notified (notification step).

[0044] Then, steps S3 to S7 are repeated until application of the cosmetic to the face is completed in step S8.

[0045] When application of the cosmetic to the face is completed in S8, the electromyograph 1 is removed from the forearm in S9, and the flow ends.

[0046] In this way, the electromyograph is attached to the user's forearm, so pressure on the face by the fingertips or hands can be evaluated in real time without the need for sensors on the fingertips or hands. Therefore, since the hands are free during evaluation, the user can carry out the usual application method and evaluation without having to worry about contact between the sensor and the face.

[0047] The appropriate range for evaluating the strength of pressure when applying cosmetics to the face, which is used for the comparison in S6 in Fig. 4, is set in advance through experiments with multiple subjects. A method for setting the appropriate range for the application pressure evaluation system will be described below.

[0048] <Pressing method> Common cosmetic application methods include the pressing method and the stroke method. First, the pressing method will be described.

[0049] Fig. 5 is a diagram showing an example of the pressing method when setting the appropriate range used in the application pressure evaluation flow according to the first embodiment. The pressing method is a method of applying pressure at the same position without moving, as shown in Fig. 5. Note that in the pressing method, the cheeks of the face are pressed multiple times for several seconds (a predetermined time), and the pressing position on the face may be changed, but when moving the pressing position, force should not be applied to the face.

[0050] The setting of the appropriate range for this pressing method is explained below. Note that when pressure is applied without movement, there is no movement friction, so the pressing method does not change whether or not a cosmetic is used, and therefore, in the following experiments, analysis was performed without using a cosmetic.

[0051] <Analysis system and flow> FIG. 6 is a functional block diagram of an analysis system when setting an appropriate range used in the application pressure evaluation flow according to the first embodiment.

[0052] The analysis system 20 includes an electromyograph 1 and an analytical information processing device 3. In the following, an example will be described in which the analytical information processing device 3 is an analytical information processing device having a configuration separate from the above-described evaluation information processing device 2, but the functions of the evaluation information processing device 2 and the analytical information processing device 3 may be integrated into a single information processing device.

[0053] It is preferable that the electromyograph 1 is of the same type as the electromyograph used by the user shown in FIG. 2, for example, but since the RMS rate of change is used for the calculation as described above, a different type of electromyograph may also be used.

[0054] The analytical information processing device 3 has an electromyography acquisition unit 311, an RMS calculation unit 312, a resting RMS value temporary storage unit 313, an RMS change rate calculation unit 314, an RMS change rate storage unit 315, a subject information acquisition unit 321, a correlation analysis unit 322, an appropriate range setting unit 323, an appropriate range accumulation unit 324, and a transmission unit 325.

[0055] The myoelectric potential acquiring section 311, RMS calculating section 312, resting RMS value temporary storage section 313, and RMS change rate calculating section 314 in the analytical information processing device 3 have the same functions as the myoelectric potential acquiring section 21, RMS calculating section 22, resting RMS value temporary storage section 23, and RMS change rate calculating section 24 in the above-mentioned information processing device 2. Note that while the evaluation information processing device 2 calculates the RMS change rate for the myoelectric potential from one electromyograph 1, the analytical information processing device 3 calculates the RMS change rate for each of multiple people based on multiple myoelectric potentials measured by multiple electromyographs 1 attached to multiple subjects.

[0056] The RMS change rate storage unit 315 stores the RMS change rate calculated by the RMS change rate calculation unit 314 for each person and for each strength.

[0057] The subject information acquisition unit 321 acquires the subject's evaluation values ​​(comfort, likes and dislikes) of emotional information before, during, and / or after pressing, and the subject's measurement information (skin moisture content, skin moisture loss (transepidermal water loss (TEWL))). Note that the subject information acquisition unit 321 is a communication unit, and if the communication method is the same, it may be realized by the same communication component as the myoelectric potential acquisition unit 311.

[0058] The correlation analysis unit 322 associates the correlation between the strength of the pressure on the face and the evaluation value or measurement information of the emotion information.

[0059] The appropriate range setting unit 323 sets an appropriate range for the RMS rate of change based on the associated correlation. Note that the appropriate range may have upper and lower limits, or only an upper limit or only a lower limit.

[0060] The appropriate range storage unit 324 stores the set appropriate range of the RMS rate of change.

[0061] The transmitting unit 325 outputs the stored appropriate range of the RMS change rate. Note that information on the appropriate range may be output as software or an application together with the calculation method, or the appropriate range of the RMS change rate may be output alone. For example, when the parameter of the subjects increases, it is also possible to update only the appropriate range of the RMS change rate independently. Note that the transmitting unit 325 is a communication unit, and if the communication method is the same, it may be realized by the same communication component as the myoelectric potential acquiring unit 311 and / or the subject information acquiring unit 321. Alternatively, it may be stored in the appropriate range storing unit 324 and made available to the user by accessing a server.

[0062] (Proper range setting flow) 7 is a measurement and analysis flowchart for setting an appropriate range in the coating pressure evaluation system according to the first embodiment. In order to set an appropriate range in the press method, data was obtained from eight subjects (No. 1 to No. 8) in their 30s and 40s as shown in FIG. 8 below.

[0063] 7, the software of the information processing device 3 is launched, and an electromyograph is attached to the forearm of each of the subjects. The electromyograph 1 measures the myoelectric potential at rest and transmits it to the analytical information processing device 3. In the actual measurements for analysis, a wireless myoelectric potential sensor manufactured by Oisaka Electronics Co., Ltd. was used as the electromyograph 1.

[0064] In S202, the information processing device 3 calculates the RMS value of the myoelectric potential of each subject at rest.

[0065] In step S203, the subject begins pressing the face in the same way as when applying cosmetics as usual. In this experiment, the subject presses the face by pressing the cheek with the hand for five seconds, which is repeated five times.

[0066] In S204, the electromyograph 1 measures the myoelectric potential of the forearm during the press and transmits the myoelectric potential to the analytical information processing device 3. In the analysis flow, the myoelectric potential may be transmitted from the electromyograph 1 to the analytical information processing device 3 in real time during the press, or may be transmitted all at once after the press.

[0067] In S205, the analytical information processing device 3 calculates the RMS rate of change in the amplitude of the myoelectric potential of the forearm during pressing.

[0068] At S206, the subject stops pressing their hands against their face with normal force.

[0069] In S207, the skin moisture content and water evaporation rate (transepidermal water loss: TEWL) of each subject's cheek are measured. Here, skin moisture content is measured using a Corneometer (registered trademark) C825 (manufactured by Courage+Khazakaelectronic GmbH, Germany) as a skin moisture meter, and transepidermal water evaporation rate TEWL is measured using a portable water evaporation meter VapoMeter (registered trademark) (manufactured by Delfin Technologies, Finland) as a water evaporation rate meter. The measurement information is then sent to the analytical information processing device 3.

[0070] In S208, the RMS change rate of the myoelectric potential amplitude of each subject's forearm measured and calculated in S205 is correlated with the skin moisture content measured in S207.

[0071] In S209, the RMS change rate of the myoelectric potential amplitude of each subject's forearm measured and calculated in S205 is correlated with the amount of water evaporation from the skin measured in S207.

[0072] Specify the pressure strength to be weak on the S210 and start pressing the face. In pressing the face on the S210, press the cheek with your hand five times in five seconds with a force weaker than usual.

[0073] In S211, the electromyograph 1 measures the myoelectric potential of the forearm during pressing, and transmits the myoelectric potential to the analytical information processing device 3.

[0074] In S212, the analytical information processing device 3 calculates the RMS rate of change of the myoelectric potential amplitude of the forearm.

[0075] Then, the pressure strength is set to "strong" in S214, and pressing on the face is started. In pressing on the face in S214, the cheek is pressed five times in five seconds with a force stronger than usual.

[0076] Returning to S211, the analytical information processing device 3 then calculates the RMS rate of change in the forearm myoelectric potential amplitude for each person for the "strong" pressing technique as well, and calculates the RMS rate of change in the forearm myoelectric potential amplitude in S212.

[0077] Once the pressing with the three different strengths (normal, strong, weak) is completed (Yes in S213), in S215, each of the subjects evaluates the sensation on their face for each pressure strength (comfort, preference (whether they like it)), and the analytical information processing device 3 acquires the evaluation value.

[0078] In S216, the analytical information processing device 3 correlates the RMS change rate of the measured and calculated forearm myoelectric potential amplitude with the evaluation value.

[0079] In S217, the thresholds (upper and lower limits) of the appropriate range of the RMS of the forearm myoelectric potential amplitude are calculated and set based on the correlation with the skin moisture content calculated in S208, the correlation with the skin moisture evaporation rate calculated in S209, and / or the correlation with the evaluation value calculated in S216.

[0080] In S218, the appropriate threshold value set in S217 is stored in the appropriate range storage unit 324 of the analytical information processing device 3, and the flow ends.

[0081] In this way, an appropriate range for evaluating the application pressure can be set based on the experimental results of multiple subjects. Specific calculations are described below.

[0082] <Experimental Example 1> Using the procedure shown in Figure 7 above, we obtained data on the RMS change rate of the EMG amplitude, the subjective feelings of the subjects (comfort, preference), cheek moisture content, and cheek moisture evaporation rate when multiple subjects pressed their faces at three different strengths: "weak," "normal," and "strong," as shown in Figure 8.

[0083] Note that "normal" pressure refers to the "strength of pressure applied to the face as applied on a daily basis," "weak" means weaker than "normal," and "strong" means stronger than "normal." Each item will be discussed below.

[0084] In S203, S210, and S214 of the above flow, electromyographs 1 were attached to the forearms of multiple subjects (e.g., eight people), and the strength of each subject's hand pressing against their face with three different strengths was detected by the change in the myoelectric potential of the forearm. As a result, RMS change rates of the amplitude of the myoelectric potential of the forearm at the three different strengths were obtained from the eight people.

[0085] Then, in S215, a questionnaire was used to obtain evaluation values ​​for comfort for each of the multiple application pressures from each of the multiple subjects. As a result, three types of evaluation values ​​for comfort (24 data points) were obtained from eight subjects. "Comfort" refers to whether or not the sensation was pleasant. As shown in the table in Figure 8, among the three strengths of "weak," "normal," and "strong," the majority of subjects felt that "normal" was the most comfortable.

[0086] The evaluation scores were obtained using a visual analogue scale (VAS), which is advantageous for statistical processing. Participants were asked to draw a line of a specified length for each question item, and to mark the level at which they currently felt. In this study, the results were converted into a 10-point scale, so the comfort index, which is one of the evaluation data for individual impressions, is also expressed as a decimal rather than an integer.

[0087] (Correlation with comfort) 9A and 9B are diagrams showing the correlation between the RMS change rate of the forearm myoelectric potential amplitude and comfort level when using the multiple pressing methods of FIG.

[0088] The analytical information processing device 3 correlates the strength of the application pressure (pressure) on the face with the evaluation value of comfort, and sets an appropriate range for the RMS rate of change of the amplitude of the myoelectric potential in accordance with the strength of the application pressure on the face that has a high evaluation value of comfort.

[0089] Specifically, FIG. 9A is a diagram showing the correlation between the RMS change rate of the amplitude of myoelectric potential and comfort, and FIG. 9B is a diagram showing the distribution of the number of people when an appropriate range is set.

[0090] In Fig. 9A, the horizontal axis represents the RMS change rate of the myoelectric potential amplitude over 5 seconds, and the vertical axis represents the comfort index. In Fig. 9B, the horizontal axis represents the number of measurement data points below, within, and above the appropriate range, and the vertical axis represents the comfort index.

[0091] As shown in FIG. 9A, for example, if the appropriate range for the RMS rate of change of the amplitude of the myoelectric potential is set to 50% to 150%, then the comfort index can be made higher within the set appropriate range than outside the appropriate range, as shown in FIG. 9B.

[0092] (Correlation with preferences) 10A and 10B are diagrams showing the correlation between preference and the RMS change rate of the amplitude of the forearm myoelectric potential obtained by the pressing method of various strengths shown in FIG.

[0093] The method for calculating the correlation between the RMS change rate of the amplitude of the EMG signal and preference is the same as in Figures 9A and 9B. "Preference" refers to a personal preference, whether or not a particular pressing method is liked or disliked, separate from the pleasant sensation (comfort). As shown in the table in Figure 8, among the three strengths, "weak," "normal," and "strong," the majority of people felt that "normal" was their favorite.

[0094] The analytical information processing device 3 correlates the strength of application pressure (pressure) to the face with the correlation between the preferred evaluation value, and sets an appropriate range with upper and lower limits corresponding to the strength of application pressure to the face with a high preferred evaluation value.

[0095] FIG. 10A is a diagram showing the correlation between the RMS change rate of the amplitude of myoelectric potential and preference, and FIG. 10B is a diagram showing the distribution of the number of people when an appropriate range is set.

[0096] In Fig. 10A, the horizontal axis represents the RMS change rate of the amplitude of the myoelectric potential, and the vertical axis represents the preference index. In Fig. 10B, the horizontal axis represents the number of measurement data points below, within, and above the appropriate range, and the vertical axis represents the preference index.

[0097] As shown in FIG. 10A, for example, if the appropriate range of the RMS change rate of the amplitude of the myoelectric potential is set to 50% to 150%, the preference index can be made higher within the appropriate range set as shown in FIG. 10B than outside the appropriate range.

[0098] (Correlation with cheek moisture content) FIG. 11 shows the correlation between the RMS change rate of the forearm myoelectric potential amplitude and the moisture content of the cheeks when performing a normal press.

[0099] As shown in S203 to S205 of the flow in Figure 7, electromyograph 1 was attached to the forearms of multiple subjects, and changes in the myoelectric potential of the forearms were detected when each of the multiple subjects pressed their hands with the same strength as when applying cosmetics to their face in the usual manner (with the strength they would use on a daily basis), and the RMS rate of change was calculated.

[0100] Then, in S207, the skin moisture content of the cheeks of each of the subjects was obtained using a corneometer. Note that the skin moisture content value is a measured value, and therefore provides more objective data than comfort or preference.

[0101] This allows us to correlate the strength of the pressure applied to the face on a daily basis with the amount of moisture in the cheeks.

[0102] Figure 11 shows the correlation between the RMS change rate of the forearm's myoelectric potential amplitude and the moisture content of the cheek when performing normal pressing. The moisture content of the cheek measured with a corneometer is the amount of moisture contained in the skin approximately 15 μm below the surface (mainly the stratum corneum), and the higher the moisture content, the better the skin condition.

[0103] As shown in Figure 11, person No. 4, who applied stronger pressure than the others, with an RMS change rate of 174%, had significantly lower cheek moisture content than the others. On the other hand, person No. 8, who applied the second strongest pressure, with an RMS change rate of 136%, did not have as much cheek moisture.

[0104] Therefore, in view of the moisture content of the cheeks, it is preferable to set the upper limit of the appropriate range of the RMS change rate of the amplitude of the myoelectric potential to between 136 and 174%, for example, 150% or 160%.

[0105] In this way, the analytical information processing device 3 can refer to this result and set an appropriate range for the RMS change rate of the amplitude of the myoelectric potential so that the application pressure is the same as that applied by a subject with high cheek moisture content.

[0106] (Correlation with cheek moisture loss) FIG. 12 shows the correlation between the RMS fluctuation rate of the amplitude of the myoelectric potential when performing normal pressing and the amount of moisture loss from the cheek.

[0107] The method for measuring the myoelectric potential of this press is the same as that shown in Figure 11, and the myoelectric potential of the forearm is detected when each of multiple subjects presses with the same strength as when applying cosmetics to the face with their hands as usual (the strength they would use on a daily basis).

[0108] Figure 12 shows the correlation between the RMS change rate of the myoelectric potential amplitude of the forearm and the transepidermal water loss of the cheek. Transepidermal water loss (TEWL) is a value that measures how much moisture escapes from the skin. A low TEWL value means that a small amount of moisture escapes from the skin, while a high TEWL value means that a large amount of moisture escapes from the skin. Therefore, the higher the TEWL, the more likely it is that the skin is rough.

[0109] As shown in Figure 12, person No. 4, who applies pressure stronger than others, usually at an RMS change rate of 174%, has a higher TEWL than others. Also, person No. 8, who applies pressure normally at an RMS change rate of 136%, has a higher TEWL than others. Person No. 7, who applies pressure normally at an RMS change rate of 102%, has a high TEWL, but person No. 2, who applies pressure normally at an RMS change rate of 126%, does not have a very high TEWL.

[0110] Therefore, from the viewpoint of the TEWL of the cheek, it is preferable to set the upper limit of the RMS change rate of the amplitude of the myoelectric potential to, for example, 103 to 135%.

[0111] The analytical information processing device 3 can refer to this result and set an appropriate range for the RMS rate of change in the amplitude of the myoelectric potential so that the application pressure is the same as that applied by a subject with a small cheek TEWL.

[0112] In the examples described above, the appropriate range of the RMS rate of change defined by the correlation between comfortable and liking in FIGS. 9 and 10 is defined by setting upper and lower limits. However, as shown in FIGS. 11 and 12, the appropriate range of the RMS rate of change may be defined by only an upper limit value.

[0113] Furthermore, the above-mentioned multiple subjects were in their 30s and 40s, but a 30-year-old and a 49-year-old are expected to have different degrees of aging and different basic skin conditions. While Figures 11 and 12 above illustrate examples of analyzing correlations using raw measurement data, for example, skin moisture content and skin TEWL may be corrected according to age and then analyzed for correlation. Alternatively, the correlations may be analyzed for each subject's skin moisture content and skin TEWL measurement values ​​relative to the average values ​​for each subject's age.

[0114] Furthermore, although the above describes an example in which the set range is set uniformly, the standard appropriate range may be changed depending on age, skin condition, or other external factors. Examples of skin condition include the presence or absence of rough skin due to seasonal dryness, the presence or absence of acne due to oily skin, and the presence or absence of sunburn. Examples of external factors include the outside temperature and weather (humidity). Personal preferences (preferring strong or weak) may also be somewhat reflected in the appropriate range. Furthermore, as another factor, heart rate may be measured, and the appropriate range for heart rate may be set in addition to the appropriate range for myoelectric potential.

[0115] <Stroke method> The above describes the pressing method, in which pressure is applied from the same position without moving, but some people apply the paint using the stroke method, in which the paint is applied while moving.

[0116] Fig. 13 is a diagram showing an example of the stroke method used to set an appropriate range used in the application pressure evaluation flow according to the first embodiment. Fig. 13A shows a state in which a hand is moving, and Fig. 13B is a diagram showing an example of the trajectory of hand pressure on the face. In this case, strokes were performed multiple times by moving the position of the hand in a substantially horizontal direction (a fixed direction) relative to the face (cheek), and the position where the greatest pressure was applied was gradually shifted in the vertical direction as shown by (1) to (4) in Fig. 13B.

[0117] The following experiment was conducted so that the appropriate range could be determined even when applying the stroke method. Note that the stroke method, in which pressure is applied while moving, generates friction during movement, and the way the hand moves differs depending on whether or not there is cosmetic product. Therefore, in this experiment, strokes were performed using cosmetic product to obtain results similar to those when applying cosmetic product.

[0118] The cosmetic used was a so-called "lotion" that contained oils such as fatty acid esters that reduce friction. Note that the oils contained in the lotion that reduce friction on the skin may be fatty acid ethers, hydrocarbons, silicone oils, fluorine-based oils, etc., in addition to fatty acid esters.

[0119] For the stroke method, multiple subjects applied cosmetics to their faces by stroking them in the same way as they normally would, and the myoelectric potential was measured and the RMS change rate of the myoelectric potential amplitude was calculated (see S203 to S206 in Figure 7).The amount of transepidermal water loss was then measured (see S207), and the correlation was examined (see S209).

[0120] Data from nine subjects were collected for the stroke method experiment. Seven of these subjects were the same as those for the press method, and two were different subjects. Specifically, No. 1, No. 2, and No. 3 in Experiment 1 were the same as No. 1, No. 2, and No. 3 in Experiment 2; No. 5 in Experiment 1 was the same as No. 4 in Experiment 2; No. 7 and No. 8 in Experiment 1 were the same as No. 5 and No. 6 in Experiment 2; and No. 10 in Experiment 1 was the same as No. 8 in Experiment 2.

[0121] Table 1 shows the measurement results of the RMS change rate of the amplitude of the subject's forearm myoelectric potential and the amount of water loss in the cheek (cheek TEWL) when the product was applied using the stroke method.

[0122] [Table 1] Comparing Table 1 with Figure 8, it can be seen that when a stroke is performed, the RMS change rate of the amplitude of the myoelectric potential is greater overall than when only a press is performed.

[0123] (Amount of moisture lost from cheeks) FIG. 14 is a graph showing the correlation between the RMS change rate of the myoelectric potential of the forearm and the amount of moisture evaporation from the cheek when a cosmetic material is applied by the stroke method.

[0124] As mentioned above, the lower the transepidermal water loss on the cheek, the better the skin condition. Drawing an approximation line, as in Figure 14, shows that the weaker the pressure, the lower the skin's transpiration rate, and the stronger the pressure, the higher the skin's transpiration rate. The data is distributed close to the approximation line.

[0125] Therefore, the analytical information processing device 3 can define the appropriate range of RMS change rate to be 400% or less, for example, so as to exclude people with high transepidermal water loss.

[0126] (Applying two types of cosmetics) 15A and 15B are graphs comparing the RMS change rate of the amplitude of myoelectric potential measured by the stroke method when a cosmetic material is applied alone and when a cosmetic material is applied after applying a beauty serum.

[0127] FIG. 15A shows the RMS change rate over time, and FIG. 15B shows the average value of the RMS change rate over the entire application time.

[0128] As shown in FIGS. 15A and 15B, when a beauty serum is applied before a lotion is applied, the application pressure tends to be higher than when only the lotion is applied.

[0129] Therefore, when applying cosmetics after applying a beauty serum, the upper limit of the appropriate range of the RMS change rate of the amplitude of the myoelectric potential should be set to a value greater than when applying cosmetics alone.

[0130] An example of a cosmetic liquid is a lotion, while examples of a beauty serum are boosters (lotion introduction), essences, and emulsions. The main difference between a lotion and a beauty serum is viscosity. Compared to a lotion, which has low viscosity like water, a beauty serum is generally a base with a high viscosity and thickness. The beauty serum used in this test contains a thickener to make the viscosity medium, so when the beauty serum is applied, it is thought that friction on the skin is reduced and the skin feels softer.

[0131] <Example of evaluation system 1> FIG. 16 is a schematic diagram of the application pressure evaluation system according to the first embodiment when used by an individual.

[0132] As shown in FIG. 16, the application pressure evaluation system 10A according to the first embodiment can be used as an application for an individual user U to evaluate the pressure applied during daily skin care.

[0133] 16 , in this configuration, the information processing device 2 is a smartphone S, and by notifying the individual user U by voice, the individual user U can continue to apply cosmetics with an appropriate strength while looking in the mirror M. In addition, the smartphone S may also display the RMS rate of change of the myoelectric potential amplitude together with the appropriate range on the display along with the voice.

[0134] In this case, by evaluating the pressure in real time, the individual user U can apply cosmetics appropriately each day, and by applying appropriate application pressure every day, the accumulated damage caused by application can be reduced and skin quality can be improved.

[0135] <Example of evaluation system 2> FIG. 17 is a schematic diagram showing a case where a beauty professional gives guidance on application pressure to a customer using the application pressure evaluation system according to the first embodiment.

[0136] In the application pressure evaluation system 10B according to the first embodiment, as shown in Fig. 17, the same electromyographs 1, 1' are attached to the forearms of a beauty professional, such as beauty advisor B, and customer C. Then, the information processing device 2 (personal computer P) can visually or audibly instruct customer C so that the same pressure as when beauty advisor B applies a comfortable and appropriate pressure to customer C's face can be reproduced.

[0137] As a result, customer C can reproduce with his own hands the appropriate pressure applied by beauty advisor B, which he would have found difficult to achieve himself, by having application pressure evaluation system 10B suggest it to him.

[0138] <Example of evaluation system 3> FIG. 18 is a schematic diagram showing a case where a beauty instructor T is instructing a beauty student BS using the application pressure evaluation system according to the first embodiment.

[0139] In the application pressure evaluation system 10C according to the first embodiment, identical electromyographs 1, 1' are attached to the forearms of a beauty instructor T and a beauty student BS, as shown in Fig. 18. Then, a state in which the professional beauty instructor T applies a comfortable and appropriate pressure to the face of a person simulating a customer is used as a sample, and the application pressure data is displayed on the display of an information processing device 2 (personal computer P).

[0140] The beauty student BS can then reproduce the application pressure by applying pressure to the same level as the sample value. In this way, the application pressure, which is difficult to communicate to others, can be conveyed visually or by sound.

[0141] In addition, as part of the training for beauty staff, Figure 18 shows an example of pressing the face of a person posing as a customer other than beauty instructor T or beauty student BS, but it is also possible to use the face of beauty student BS to apply application pressure and provide instruction.

[0142] The beauty students in this training include, for example, beauty advisor trainees, esthetician trainees, and various massage trainees.

[0143] In either example, the application pressure beauty system according to the first embodiment can visualize and evaluate the pressure applied to the face by fingers or hands, which has been difficult to visualize or evaluate, in real time without installing sensors on the fingertips or hands.

[0144] In the above embodiment, an example has been described in which the pressure on the face when applying cosmetics to the face with fingers or hands is measured and evaluated via the myoelectric potential of the arm, but the application pressure evaluation system according to the first embodiment can also measure and evaluate the pressure on the face when applying cosmetics to the face via a puff or cotton, as shown in Fig. 18. In this case, it is preferable to set the appropriate range of myoelectric potential described above that is appropriate for the puff or cotton, taking into account the thickness of the puff or cotton and friction with the skin.

[0145] [Second embodiment] <Outline of the coating pressure evaluation system> An application pressure evaluation system 100 according to the second embodiment will be described with reference to Figures 19 and 20. Figure 19 is a schematic diagram of the application pressure evaluation system 100 according to the second embodiment. Figure 20 is a functional block diagram of the application pressure evaluation system 100 according to the second embodiment. The application pressure evaluation system 100 of the second embodiment differs from the application pressure evaluation system 10 of the first embodiment in that it evaluates the application pressure by using an accelerometer 4 (measurement device) to detect acceleration (measured value) when a user applies cosmetics to their face with their hands. The method of setting the appropriate range is the same as in the first embodiment.

[0146] The application pressure evaluation system 100 of this embodiment includes an accelerometer 4 and an information processing device 5.

[0147] As shown in Fig. 19, accelerometer 4 is attached to the wrist of a user and detects the application pressure of the user's hand when applying cosmetics to the face by means of acceleration. Accelerometer 4 is attached to the wrist as shown in Fig. 19, and its direction of movement is perpendicular to the contact surface between the palm and cheek. In this embodiment, accelerometer 4 is attached to the wrist, but it may also be attached to the upper arm or forearm.

[0148] The accelerometer 4 is, for example, a triaxial acceleration sensor that detects acceleration in the x-axis, y-axis, and z-axis directions. Specific examples include smartphones, electromyographic sensors, and inertial measurement units that incorporate a triaxial acceleration sensor.

[0149] The information processing device 5 can communicate with the accelerometer 4, can acquire acceleration from the accelerometer 4, and evaluates and notifies the application pressure based on the acceleration. The information processing device 5 may be an information processing terminal for evaluation, such as a smartphone, tablet, mobile phone, or laptop computer, which is capable of outputting audio and / or images. Alternatively, the information processing device 5 may be an information processing terminal dedicated to the application pressure evaluation system 100.

[0150] In the application pressure evaluation system 100, a speaker, a projector, or the like may be connected to the information processing device 5, and in that case, the notification function may be performed by voice from the speaker or by a projected image from the projector.

[0151] Communication between the information processing device 5 and the accelerometer 4 is realized by, for example, Bluetooth (registered trademark), infrared communication, Wi-Fi (registered trademark), or the like.

[0152] 20 , the information processing device 5 has an acceleration acquisition unit 51, a frequency power spectrum calculation unit 52, an appropriate range storage unit 53, a comparison unit 54, an audio output unit 55, and a display unit 56. The audio output unit 55 and the display unit 56 together form a notification unit 58. The frequency power spectrum calculation unit 52, the appropriate range storage unit 53, and the comparison unit 54 together form an evaluation unit 57.

[0153] The acceleration acquisition unit 51 is an acquisition unit that acquires acceleration, and acquires, via communication, the acceleration measured by the accelerometer 4. When a smartphone is used as the accelerometer 4, the acceleration acquisition unit 51 may be an application for recording acceleration.

[0154] The frequency power spectrum calculation unit 52 acquires acceleration data obtained when applying a cosmetic product at a specific frequency, long enough to extract the target frequency components. It then uses a frequency filter to reduce the effects of gravitational acceleration and noise contained in the acquired acceleration waveform, and performs a fast Fourier transform (FFT) to obtain a frequency power spectrum. The power value of the target frequency is then detected from the acquired frequency power spectrum. The highest power value on the x-axis, y-axis, or z-axis may be used. When the direction and period of motion are fixed, Newton's equation of motion (F = ma) dictates that the acceleration of an object is proportional to the force (Force [N]) acting on the object. When pressing a cheek with the palm of one's hand (hand press), it is assumed that no external force acts on the hand or arm. Therefore, the force acting on the hand is likely to depend significantly on the user's muscle movement. Based on the above, we believe that by measuring the acceleration during hand pressing while fixing the direction and period of movement of the upper arm, forearm, or wrist, it is possible to approximately estimate the magnitude of the force generated by the muscle movement of the upper arm, forearm, or wrist, i.e., the application pressure.

[0155] The appropriate range storage unit 53 is a storage unit that stores in advance an appropriate range of the power value of the frequency to be detected.

[0156] The comparison unit 54 compares whether the obtained power value of the frequency to be detected is within an appropriate range.

[0157] Based on the comparison result from the comparison unit 54, the notification unit 58 notifies whether the power value calculated from the acquired acceleration is within or outside the appropriate range.

[0158] When the notification is made by voice, the voice output unit 55 notifies by voice whether the detected power value is within or outside the appropriate range. In the case of voice, the notification may be made only when the power value is outside the appropriate range, or only when the power value is within the appropriate range.

[0159] When notifying by display, the power value of the frequency to be detected and its appropriate range value are superimposed on each other on the display unit 56. The display may be, for example, a liquid crystal display panel, an EL (Electro-luminescence) or an OLED (Organic Light Emitting Diode) display panel.

[0160] Furthermore, the notification by the notification unit 58 may be a combination of visual notification and audio notification.

[0161] The functions of the frequency power spectrum calculation unit 52, the appropriate range storage unit 53, and the comparison unit 54 in the information processing device 5 are implemented in a program such as an application, for example, and can be executed by launching the application.

[0162] In addition, although not shown in the figure, the information processing device 5 also includes electronic components, such as a CPU (Central Processing Unit), RAM (Random Access Memory), ROM (Read Only Memory), HDD (Hard Disk Drive), input / output interface, and internal bus, which perform information processing related to basic operations.

[0163] (Application pressure evaluation flow) Next, an application pressure evaluation method in the application pressure evaluation system 100 will be described with reference to Fig. 21. Fig. 21 shows a flow of evaluating the application pressure on the face when the application pressure evaluation system 100 of the second embodiment is used.

[0164] In S11, as preparation, an application for the information processing device 5 is launched and the accelerometer 4 is attached to the forearm or wrist of the user. At this time, the accelerometer 4 measures acceleration and transmits it to the information processing device 5.

[0165] In S12, the user begins applying the cosmetic to the face with their hands.

[0166] In S13, the accelerometer 4 measures the acceleration of the forearm or the wrist and transmits the measured acceleration to the information processing device 5.

[0167] In S14, the frequency power spectrum calculation unit 52 of the information processing device 5 calculates a frequency power spectrum (power spectrum) from the acquired acceleration waveform, and detects the power value of the frequency to be detected from the frequency power spectrum (this is the detection step).

[0168] In S15, the comparison unit 54 of the information processing device 5 compares the power value of the frequency to be detected, which is obtained from the frequency power spectrum of the acceleration waveform, with the stored appropriate range (comparison step).

[0169] In S16, strength information is notified based on the result of comparison of the power value of the frequency to be detected, which is obtained from the frequency power spectrum of the acceleration waveform, with the appropriate range (notification step).

[0170] Then, S12 to S16 are repeated until application of the cosmetic to the face is completed in S17.

[0171] When application of the cosmetic to the face is completed in S17, the accelerometer 4 is removed from the forearm or wrist in S18, and the flow ends.

[0172] In this way, the accelerometer is attached to the user's forearm or wrist, and the hand is free during the evaluation, allowing the user to carry out the usual application method and evaluation without having to worry about contact between the sensor and the face.

[0173] The appropriate range for evaluating the strength of pressure when applying cosmetics to the face, which is used for the comparison in S15 of Fig. 21, is set in advance through experiments with multiple subjects. A method for setting the appropriate range for the application pressure evaluation system will be described below.

[0174] An accelerometer 4 is attached to a location selected from the upper arm, forearm, and wrist of each of multiple subjects. The subjects press their faces repeatedly for 30 seconds at a cycle of once per second using the same pressing method as in the first embodiment. A sound may be generated from a speaker at a cycle of once per second to instruct the subjects to perform the press in time with the sound stimulus. The cycle of the press is not limited to once per second and can be any cycle. However, if the cycle is changed, two conditions must be met: (1) it must be possible to assume that a sine wave of the target frequency is sufficiently included within the data section to be analyzed, and (2) the cycle must be a movement cycle that the subjects can perform comfortably. Furthermore, the press repetition time can be any time, not limited to 30 seconds, only if the above two conditions are met. The accelerometer 4 measures acceleration during the press and transmits the acceleration to the information processing device 5. The acceleration data from the accelerometer 4 to the information processing device 5 may be transmitted in real time during the press or collectively after the press. The acceleration data analysis for determining the appropriate range may be performed using the analytical information processing device 3 similar to that in the first embodiment.

[0175] The above pressing motion was performed with four different strengths: normal pressure, about half the normal pressure, about twice the normal pressure, and the most comfortable pressure. Normal pressure refers to the amount of pressure normally used when hand pressing skin care cosmetics. Half the normal pressure refers to about half (1 / 2) the normal pressure mentioned above. About twice the normal pressure refers to about twice the normal pressure mentioned above. The most comfortable pressure refers to the pressure that feels most comfortable.

[0176] A frequency power spectrum is calculated from the acceleration waveform obtained by measurement using four different strengths: normal force, approximately half the normal force, approximately twice the normal force, and the force felt most comfortable. The appropriate range is then set by detecting the power value of the target frequency from the obtained frequency power spectrum. For example, the lower limit of the appropriate range may be set by averaging the power values ​​of the axis with the highest peak in the frequency power spectrum when pressing with approximately half the normal force across multiple subjects. Furthermore, the upper limit of the appropriate range may be set by averaging the power values ​​of the axis with the highest peak in the frequency power spectrum when pressing with approximately twice the normal force across multiple subjects. The appropriate range may have upper and lower limits, or only an upper limit or only a lower limit may be set. The method for analyzing the peak of the frequency power spectrum is not limited to the above-described method, and any other method may be used. The appropriate range may also be set based on the correlation between the power value of the target frequency obtained from the frequency power spectrum and the evaluation value of the subject's emotional information, the cheek moisture content, the cheek moisture evaporation rate, etc., as shown in the first embodiment.

[0177] The appropriate range set as described above is stored in the appropriate range storage unit 53.

[0178] In this way, an appropriate range for evaluating the application pressure can be set based on the experimental results of multiple subjects. Specific calculations are described below.

[0179] <Experimental Example 2> As described above, acceleration was measured for 45 seconds while pressing the face of multiple subjects at four different intensities: normal force, half normal force, twice normal force, and the most comfortable force. An iPhone® was used to measure acceleration, and the subject was attached with the back of the iPhone® touching the outside of their upper arm. Acceleration data was acquired using an iPhone® and the SensorLog app (Mosenia et al., 2018). Acceleration waveforms were obtained for normal force (Figure 22A), half normal force (Figure 22B), twice normal force (Figure 22C), and the most comfortable force (Figure 22D). The sampling frequency was 100 Hz. Note that the acceleration waveforms shown in Figures 22A–22D represent data from one subject. Of the 45 seconds of measurement time, the first 15 seconds were used as a familiarization period to grasp the 1 Hz movement rhythm, and the subsequent 30 seconds were used for data analysis.

[0180] Next, a high-pass filter was applied to the acceleration waveforms obtained in Figures 22A-22D to reduce the effects of gravitational acceleration and noise. A Butterworth-type second-order zero-phase filter with a cutoff frequency of 0.05 Hz was applied. A 4096-point FFT was then performed on the high-pass filtered signal. Specifically, a cosine tapered (cos10 taper) window function was applied to 30 seconds (3000 points) of data, followed by zero padding and an FFT. The discrete Fourier transform was then scaled by the length of the input signal, and the squares of the amplitude spectrum values ​​for all frequencies except 0 and the Nyquist frequency were calculated to obtain the frequency power spectrum. The values ​​for each band within the range of 0.977 Hz to 1.123 Hz were summed. As a result of the above, we obtained the frequency power spectrum when pressing with the usual force (Figure 23A), the frequency power spectrum when pressing with about half the usual force (Figure 23B), the frequency power spectrum when pressing with about twice the usual force (Figure 23C), and the frequency power spectrum when pressing with the force that felt most comfortable (Figure 23D).

[0181] From the obtained frequency power spectrum, the power value of the axis with the highest peak among the x-axis, y-axis, and z-axis was used. The power value of the axis with the highest peak was 1.06G in the frequency power spectrum when pressing with normal force. 2 (y-axis) The frequency power spectrum when pressing with half the usual force is 0.41G. 2 (y-axis) The frequency power spectrum when pressing with twice the usual force is 2.63G. 2 (y-axis), the frequency power spectrum when pressing with the most comfortable force is 0.42G 2 (y-axis). For other subjects, the power value of the axis with the highest peak was used in the same way. The optimum range can be set, for example, with the "most comfortable force" at the center, as a range of 50% of the difference between the usual force and the most comfortable force. In other words, in this experimental example, the optimum value was 0.10G, calculated as 0.42±0.5×|1.06-0.42|. 2 Over 0.72G 2 The following is the result.

[0182] As described above, the application pressure evaluation method according to the second embodiment also makes it possible to evaluate the pressure exerted by the fingertips or hands on the face in real time without providing sensors on the fingertips or hands.

[0183] In the above example, the application pressure applied together with the cosmetic product was described, but the system of the present invention may also be applied to pressure evaluation (for example, how to press acupressure points or how to massage) that does not involve the application of cosmetic products.

[0184] Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to the specific embodiments described above, and various modifications and variations are possible within the scope of the gist of the present invention as set forth in the claims.

[0185] This international application claims priority based on Japanese Patent Application No. 2020-084782, filed on May 13, 2020, the entire contents of which are hereby incorporated by reference into this international application. [Explanation of symbols]

[0186] 1,1' electromyograph 2,5 Information processing equipment 3. Analytical information processing equipment 4 Accelerometer 10,10A,10B,10C,100 Application pressure evaluation system 20 Analysis System 21 Myoelectric potential acquisition unit 22 RMS calculation section (calculation section) 23 Resting RMS value temporary storage unit 24 RMS change rate calculation section (calculation section) 25,53 Appropriate range memory unit (memory unit) 26,54 Comparison section 27,55 Audio output section 28,56 Display section 57 Evaluation Department 29,58 Notification Department 311 Myoelectric potential acquisition unit 312 RMS calculation unit (calculation unit) 313 Resting RMS value temporary storage unit 314 RMS rate of change calculation section 315 RMS rate of change memory section 321 Subject Information Acquisition Department 322 Correlation Analysis Department 323 Appropriate Range Setting Section 324 Appropriate Range Accumulation Unit 325 Transmission Unit U Individual user (user) B Beauty professional (beauty advisor) C customer T Beauty instructor BS Beauty Student S smartphone P PC

Claims

1. a detection step of detecting, by a change in a measurement value, an application pressure when the user applies the cosmetic to the face with the hand of the user using a measurement device attached to the upper arm, forearm, or wrist of the user; a comparison step of comparing whether a value calculated from the detected measurement value is within an appropriate range; a notification step of notifying the user whether the value obtained from the measurement value is within or outside the appropriate range, The appropriate range is set based on a correlation between a value obtained from a measurement value measured using the measuring device when applying a cosmetic to the face by hand and one or more selected from emotional information, which is facial sensation, and measurement information of facial skin. Application pressure evaluation method.

2. The emotional information is one or more of comfort and preference, and the measurement information is one or more of skin moisture content and skin moisture evaporation rate. The coating pressure evaluation method according to claim 1 .

3. the measuring device is an electromyograph attached to the forearm of the user, The measured value is a myoelectric potential. The coating pressure evaluation method according to claim 1 or 2.

4. In the detecting step, the manner in which the user applies pressure to the face when applying the cosmetic with her / his hands and holding the area for a predetermined time is detected based on a change in the myoelectric potential of the forearm. The coating pressure evaluation method according to claim 3 .

5. In the detecting step, the manner in which the user applies force to the face when the user applies the cosmetic with her / his hands and moves multiple times in a certain direction while applying pressure to the face is detected based on a change in the myoelectric potential of the forearm. The coating pressure evaluation method according to claim 3 .

6. a measuring device attached to the upper arm, forearm, or wrist of a user, which detects application pressure by changes in measurement value when the user applies cosmetic material to the face with their hand; an information processing device capable of acquiring the measurement value from the measurement device, The information processing device includes: an acquisition unit that acquires the measurement value of the measurement device; a storage unit that stores the appropriate range; a comparison unit that compares the value calculated from the acquired measurement value to determine whether it is within the appropriate range; a notification unit that notifies whether the value calculated from the measurement value is within or outside the appropriate range, The appropriate range is set based on a correlation between a value obtained from a measurement value measured using the measuring device when applying a cosmetic to the face by hand and one or more selected from emotional information, which is facial sensation, and measurement information of facial skin. Application pressure evaluation system.

7. The emotional information is one or more of comfort and preference, and the measurement information is one or more of skin moisture content and skin moisture evaporation rate. The coating pressure evaluation system according to claim 6 .

8. the measuring device is an electromyograph attached to the forearm of the user, The measured value is a myoelectric potential. The coating pressure evaluation system according to claim 6 or 7.

9. the information processing device includes a calculation unit that, after acquiring the myoelectric potential, calculates a rate of change of a root mean square (RMS) of the amplitude of the myoelectric potential; the comparison unit compares whether or not the RMS change rate of the myoelectric potential, which is a value calculated from the myoelectric potential, is within the appropriate range defined by the RMS change rate. The coating pressure evaluation system according to claim 8 .

10. the notification unit is a display, The rate of change of the RMS of the myoelectric potential and the value of the appropriate range are displayed in an overlapping manner on the display. The coating pressure evaluation system according to claim 9 .

11. the notification unit is an audio output unit, the audio output unit notifies by audio whether the detected myoelectric potential is within or outside the appropriate range. The coating pressure evaluation system according to claim 8 .

12. Further comprising an appropriate range setting unit that sets the appropriate range, The appropriate range setting unit sets an appropriate range having upper and lower limits corresponding to the strength of application pressure to the face with a high evaluation value of comfort based on a correlation established between (i) the strength of application pressure to the face detected by changes in the myoelectric potential of the forearm when each of the multiple subjects applies cosmetic material to their face with their hands at multiple application pressure strengths by attaching electromyographs to the forearms of the multiple subjects, and (ii) the evaluation value of comfort for each of the multiple application pressures obtained from each of the multiple subjects. The coating pressure evaluation system according to claim 6 .

13. Further comprising an appropriate range setting unit that sets the appropriate range, The appropriate range setting unit sets an appropriate range having upper and lower limits corresponding to the strength of application pressure to the face according to the preferred evaluation value, based on a correlation established between (i) the strength of application pressure to the face detected by changes in the myoelectric potential of the forearm when each of the multiple subjects applies the cosmetic to the face with their hands at multiple application pressure strengths by attaching electromyographs to the forearms of the multiple subjects, and (ii) the preferred evaluation value for each of the multiple application pressures obtained from each of the multiple subjects. The coating pressure evaluation system according to claim 6 .

14. Further comprising an appropriate range setting unit that sets the appropriate range, The appropriate range setting unit sets an appropriate range having upper and lower limits so that the application pressure is the same as that used by subjects with high cheek moisture, based on a correlation established between (i) the strength of application pressure to the face that is normally applied by the subjects, detected by changes in the myoelectric potential of the forearm when the subjects attach electromyographs to the forearms and apply the cosmetic to their faces with their hands at the strength that each of the subjects normally applies the cosmetic to, and (ii) the cheek moisture content obtained from each of the subjects. The coating pressure evaluation system according to claim 6 .

15. Further comprising an appropriate range setting unit that sets the appropriate range, The appropriate range setting unit Electromyographs were attached to the forearms of multiple subjects, and the application pressure when each subject applied cosmetics to their face by hand at the strength they normally use was detected by measuring changes in the myoelectric potential of the forearm. Obtaining the amount of water evaporation from the facial skin of each of the subjects after application; (i) the strength of application pressure to the face that is usually applied, detected by changes in the myoelectric potential of the forearm when electromyographs are attached to the forearms of multiple subjects and the multiple subjects each apply a cosmetic to their face with a strength that is usually applied by each of the multiple subjects, and (ii) the amount of water evaporation from the facial skin after application, obtained from each of the multiple subjects, based on a correlation between the strength of application pressure to the face that is usually applied, detected by changes in the myoelectric potential of the forearm, and (ii) the amount of water evaporation from the facial skin after application, obtained from each of the multiple subjects, An appropriate range having an upper limit is set so as to exclude a range in which the amount of water evaporation is high. The coating pressure evaluation system according to claim 6 .

16. A method for setting the appropriate range in the coating pressure evaluation system according to any one of claims 6 to 11, comprising: a detection value acquisition step of attaching electromyographs to the forearms of a plurality of subjects, and detecting the application pressures of the plurality of subjects when they apply the cosmetic to their faces with their hands at a plurality of different application pressure intensities, based on changes in the myoelectric potential of the forearms; A step of acquiring an evaluation value of comfort for each of a plurality of application pressures from each of a plurality of subjects; A step of correlating the strength of application pressure on the face with the evaluation value of comfort; and a range setting step of setting an appropriate range having upper and lower limits in accordance with the strength of the application pressure on the face that had a high evaluation value of comfort. A method for setting an appropriate range in a dispensing pressure evaluation system.

17. A method for setting the appropriate range in the coating pressure evaluation system according to any one of claims 6 to 11, comprising: a detection value acquisition step of attaching electromyographs to the forearms of a plurality of subjects, and detecting the application pressures of the plurality of subjects applying the cosmetic to their faces with their hands at a plurality of application pressure intensities by detecting changes in the myoelectric potential of the forearms; obtaining preference evaluation values ​​for each of a plurality of application pressures from each of a plurality of subjects; A step of correlating the strength of application pressure on the face with the preference evaluation value; and a range setting step of setting an appropriate range having upper and lower limits in accordance with the strength of the application pressure on the face according to the preferred evaluation value. A method for setting an appropriate range in a dispensing pressure evaluation system.

18. A method for setting the appropriate range in the coating pressure evaluation system according to any one of claims 6 to 11, comprising: a detection value acquisition step of attaching electromyographs to the forearms of a plurality of subjects and detecting application pressures based on changes in the myoelectric potential of the forearms when the plurality of subjects apply cosmetics to their faces with their hands at the strength that they normally use; acquiring the moisture content of the skin of each of the plurality of subjects; A process of correlating the strength of application pressure to the face when applied daily with the moisture content of the cheeks; and a range setting step of setting an appropriate range having upper and lower limits so that the application pressure is the same as that applied to a subject with a high cheek moisture content. A method for setting an appropriate range in a dispensing pressure evaluation system.

19. A method for setting the appropriate range in the coating pressure evaluation system according to any one of claims 6 to 11, comprising: a detection value acquisition step of attaching electromyographs to the forearms of a plurality of subjects and detecting application pressures based on changes in the myoelectric potential of the forearms when the plurality of subjects apply cosmetics to their faces with their hands at the strength that they normally use; Obtaining the amount of water evaporation from the facial skin of each of the subjects after application; A step of correlating the strength of application pressure to the face when applied daily with the amount of water evaporation; A range setting step of setting an appropriate range having an upper limit so as to exclude a range in which the amount of water evaporation is large. A method for setting an appropriate range in a dispensing pressure evaluation system.

20. the measuring device is an accelerometer; The measurement value is acceleration. The coating pressure evaluation method according to claim 1 or 2.

21. In the detecting step, the manner in which the user applies pressure to the face when applying the cosmetic with their hands and holding the area for a predetermined time is detected based on the acceleration. The method for evaluating application pressure according to claim 20.

22. In the detecting step, the manner in which the force is applied to the face when the user applies the cosmetic by hand and moves multiple times in a certain direction while applying pressure to the face is detected based on the acceleration. The method for evaluating application pressure according to claim 20.

23. the measuring device is an accelerometer; The measurement value is acceleration. The coating pressure evaluation system according to claim 6 or 7.

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