WO2021130998A1 - Système de détection de caractéristique de la peau et procédé de détection de caractéristique de la peau - Google Patents

Système de détection de caractéristique de la peau et procédé de détection de caractéristique de la peau Download PDF

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Publication number
WO2021130998A1
WO2021130998A1 PCT/JP2019/051284 JP2019051284W WO2021130998A1 WO 2021130998 A1 WO2021130998 A1 WO 2021130998A1 JP 2019051284 W JP2019051284 W JP 2019051284W WO 2021130998 A1 WO2021130998 A1 WO 2021130998A1
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WIPO (PCT)
Prior art keywords
skin
amount
reaction force
contactor
pushing
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PCT/JP2019/051284
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English (en)
Japanese (ja)
Inventor
泰規 風間
尚美 北村
直輝 齋藤
正吾 岡本
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株式会社 資生堂
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Application filed by 株式会社 資生堂 filed Critical 株式会社 資生堂
Priority to PCT/JP2019/051284 priority Critical patent/WO2021130998A1/fr
Priority to CN202080090258.9A priority patent/CN114885600A/zh
Priority to PCT/JP2020/048974 priority patent/WO2021132656A1/fr
Priority to JP2021567721A priority patent/JPWO2021132656A1/ja
Publication of WO2021130998A1 publication Critical patent/WO2021130998A1/fr

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons

Definitions

  • the present disclosure relates to a skin characteristic detection system and a skin characteristic detection method.
  • the feeling of softness when touching the skin (skin) (for example, the amount of force that the skin feels pushed back to the skin when the skin is pushed in, the degree to which the skin feels clogged when the skin is pushed in, etc.)
  • Various systems have been proposed in order to quantitatively grasp.
  • a system for example, a system is known in which a negative pressure is applied to the skin by a probe to suck the skin surface for a certain period of time, then the negative pressure is removed, and the displacement on the skin surface in the process is measured.
  • parameters related to changes on the skin surface in the process of applying and removing negative pressure are detected as an index indicating the softness of the skin.
  • Patent Document 1 a system for measuring the pressure applied to the contact when the skin is pushed by the contact with a load cell has been proposed (for example, Patent Document 1).
  • the maximum value of the pressure applied to the contact is detected as an index showing the softness of the skin.
  • an object of the present disclosure is to provide a skin characteristic detection system capable of detecting the value of a parameter that is a new index indicating the softness of the skin.
  • the gist of this disclosure is as follows.
  • a skin characteristic detection system that detects characteristic values that represent skin characteristics, a push amount control device that controls the amount of push of a contactor into the skin, and a reaction force that measures the reaction force applied from the skin to the contactor.
  • the push-in amount control device includes a force measuring device and a detection device that detects the characteristic value based on the measured reaction force, and the push-in amount control device increases the push-in amount of the contactor into the skin at a constant speed.
  • the value is a parameter representing the non-linearity of the reaction force with respect to the pushing amount when the pushing amount of the contactor into the skin is increased at a constant speed, and the pushing amount of the contact into the skin at a constant speed.
  • a skin property detection system that includes at least one value of a parameter that represents the percentage of energy that has not been released to.
  • the value of the parameter representing the non-linearity of the reaction force with respect to the pushing amount when the pushing amount of the contactor into the skin is increased at a constant speed is the value after the increase of the pushing amount is started.
  • the integrated value of the reaction force measured until the pushing amount reaches the predetermined amount, and the pushing amount and the reaction force when the pushing amount reaches the predetermined amount after the increase of the pushing amount is started. Assuming that the reaction force increases at a constant speed, it is the ratio to the integrated value of the reaction force from the start of the increase of the pushing amount to the arrival of the pushing amount at the predetermined amount [1]. ] Or [2].
  • the skin characteristic detection system is the ratio to the integrated value of the reaction force from the start of the increase of the pushing amount to the arrival of the pushing amount at the predetermined amount [1]. ] Or [2].
  • the value of the parameter representing the change in the reaction force when the pushing amount was kept constant was connected in series with the dashpot when the viscoelastic property of the skin was approximated by the three-element solid model.
  • the skin characteristic detection system according to any one of the above [1] to [4], which corresponds to the spring constant of a linear spring.
  • the value of the parameter representing the change in the reaction force when the pushing amount is kept constant is that the reaction force elastically changes when the pushing amount of the contactor into the skin is increased at a constant speed. It is a value obtained by subtracting the elastic modulus when the reaction force is approximated to be elastically changed when the amount of pushing the contactor into the skin is reduced at a constant speed from the elastic modulus when the contact force is approximated.
  • the skin characteristic detection system according to any one of the above [1] to [5].
  • the value of the parameter representing the ratio of the energy that is not released when the pushing amount is kept constant is the period from the start of the increase of the pushing amount to the time when the pushing amount reaches the predetermined amount. It is the ratio of the measured reaction force integrated value to the reaction force integrated value measured while reducing the pushing amount from the predetermined amount to the pushing amount when the increase of the pushing amount is started.
  • the skin characteristic detection system according to any one of the above [1] to [6].
  • the characteristic value is any one of the above [1] to [7], which includes an integral value of the reaction force measured during the period from the start of the increase in the pushing amount to the elapse of a predetermined time.
  • the skin property detection system described in 1. [9] The push-in amount control device is configured to increase the push-in amount of the contactor into the skin at a constant rate, then maintain it constant, and then decrease it at a constant rate [1]. ] To [8]. The skin characteristic detection system according to any one of [8]. [10] The push-in amount control device is configured to increase the push-in amount of the contactor into the skin at a constant speed and then decrease it at a constant speed without maintaining the push-in amount constant. The skin characteristic detection system according to any one of the above [1] to [8]. [11] A skin characteristic detection method for detecting a characteristic value representing a characteristic of the skin.
  • the characteristic value includes detecting the characteristic value based on the measured reaction force, and the characteristic value is based on the pushing amount when the pushing amount of the contactor into the skin is increased at a constant rate.
  • a parameter representing the non-linearity of the reaction force a parameter representing the rigidity of the skin in consideration of the non-linearity of the reaction force when the amount of pushing the contactor into the skin is increased at a constant speed, and the constant pushing amount.
  • a skin characteristic detection method including at least one value of a parameter representing a change in the reaction force when the pressure is maintained and a parameter representing the ratio of energy not released when the pushing amount is kept constant. ..
  • a skin characteristic detection system capable of detecting the value of a parameter that is a new index indicating the softness of the skin is provided.
  • FIG. 1 is a diagram schematically showing a skin characteristic detection system according to one embodiment.
  • FIG. 2 is a diagram schematically showing a skin characteristic detection system when detecting a reaction force by a sensor.
  • FIG. 3 is a diagram schematically showing a detection mode when the reaction force is detected by the sensor.
  • FIG. 4 is a diagram showing the time transition of the displacement of the contactor and the reaction force of the skin when the contactor of the sensor is moved.
  • FIG. 5 is a diagram showing the state of the sensor and the skin at each stage when measuring the reaction force of the skin.
  • FIG. 6 is a diagram showing a three-element solid model.
  • FIG. 7 is a diagram similar to FIG. 4 (B) showing the time transition of the displacement of the contact when the contact of the sensor is moved.
  • FIG. 8 is a diagram similar to FIG. 4 (B) showing the time transition of the displacement of the contact when the contact of the sensor is moved.
  • FIG. 9 is a diagram similar to FIG. 4 (B) showing the time transition of the displacement of the contact when the contact of the sensor is moved.
  • FIG. 10 is a diagram showing the relationship between the movement distance of the contactor and the reaction force during the period in which the contactor is being moved.
  • FIG. 11 is a diagram showing the average value of the parameter k2 for each age group of the subjects.
  • FIG. 12 is a diagram showing the average value of the parameter a for each age of the subject.
  • FIG. 13 is a diagram showing the average value of the parameter RC for each age group of the subjects.
  • FIG. 14 is a diagram showing the average value of the parameter k1 for each age group of the subjects.
  • FIG. 1 is a diagram schematically showing a skin characteristic detection system 1 according to one embodiment.
  • the skin characteristic detection system 1 detects characteristics such as human skin and a human skin model created by imitating human skin, particularly characteristic values expressing a feeling of softness (hereinafter, the characteristic values of human skin are used.
  • the case of detection will be described as an example).
  • the feeling of softness is the feeling of the skin when touching the skin (skin), especially the softness of the skin (the force of pushing back when the skin is pushed in, the degree of feeling that the skin is clogged when the skin is pushed in). , Tension, softness, etc.).
  • the skin characteristic detection system 1 includes a sensor 10 and a processing device 20 electrically connected to the sensor 10.
  • the sensor 10 is used to detect the magnitude of the reaction force when the human skin is pushed.
  • the processing device 20 is used to detect a characteristic value representing a characteristic of the skin (particularly, a feeling of softness) based on the measurement result of the sensor 10.
  • the sensor 10 includes a housing 11, a contact 12, a load cell 13, an actuator 14, a substrate 15, and a cover 16.
  • the housing 11 is formed in a cylindrical shape with a resin such as polystyrene.
  • the housing 11 houses the load cell 13, the actuator 14, and the substrate 15. Further, the housing 11 has an opening, and the contactor 12 is arranged so as to pass through the opening.
  • the contactor 12 is arranged so as to be slidable with respect to the housing 11 in the axial direction thereof. Therefore, the tip of the contact 12 can move outward from the housing 11 and toward the inside of the housing 11.
  • the housing 11 may have any outer shape as long as it can accommodate the load cell 13 and the like.
  • the contactor 12 is basically formed in a cylindrical shape, and the tip portion is formed in a hemispherical shape.
  • the diameter of the contact 12 is 2 to 20 mm, 5 to 15 mm, or 7 to 12 mm.
  • the contactor 12 is preferably about 10 mm in size so as to be about the size of a human fingertip.
  • the axial length of the contact 12 is, for example, 25 mm.
  • the contact 12 is formed of a resin such as polystyrene.
  • the tip of the contactor 12 projects out of the housing 11.
  • the load cell 13 is an example of a reaction force measuring device that measures the reaction force applied to the contactor 12 from the skin.
  • the load cell 13 is, for example, a strain gauge, and measures the reaction force applied from the skin to the contact 12 when the contact 12 is pressed against the skin.
  • the load cell 13 is housed in the housing 11 and is connected to and located between the contacts 12 and the actuator 14.
  • the actuator 14 constitutes a part of the push amount control device that controls the push amount of the contact 12 into the skin.
  • the actuator 14 is composed of a motor or the like, and drives the contactor 12 at an arbitrary speed in the axial direction thereof.
  • the board 15 is electrically connected to the load cell 13 and the actuator 14. Further, a part of the wiring of the substrate 15 extends to the outside of the housing 11, and this wiring is connected to the processing device 20 described later. Therefore, the output signal from the load cell 13 is transmitted to the processing device 20 via the substrate 15. Further, the drive signal of the actuator 14 from the processing device 20 is transmitted to the actuator 14 via the substrate 15.
  • the cylindrical cover 16 is fixed to the housing 11 so as to surround the contactor 12.
  • the cover 16 is formed so that its axial length is shorter than the axial length of the contactor 12. Therefore, the contact 12 can extend beyond the tip of the cover 16.
  • the cover 16 is mainly used to protect the contact 12 of the sensor 10 from an external force in the lateral direction during setting of the sensor 10 or during transportation.
  • the sensor 10 may include a battery that supplies electric power for driving the actuator 14. Further, the housing 11 may be provided with an illumination such as an LED light around the contactor 12. This makes it easier to visually confirm the contact between the contactor 12 and the skin.
  • the processing device 20 is an example of a detection device that detects a characteristic value representing the characteristics of the skin based on the measured reaction force. Further, the processing device 20 constitutes a part of the pushing amount control device that controls the pushing amount of the contact 12 into the skin. It includes a processor such as a CPU 21, a communication interface 22, and a memory 23. The CPU 21, the communication interface 22, and the memory 23 are connected to each other by a bidirectional bus.
  • the CPU 21 performs various arithmetic processes.
  • the CPU 21 outputs, for example, a control signal of the actuator 14. Based on the transition of the reaction force measured by the load cell 13, the values of various parameters relating to the characteristic values representing the characteristics of the skin are calculated. Further, the CPU 21 transmits a drive signal for driving the actuator 14 via the communication interface 22. Therefore, the CPU 21 controls the amount of pushing the contactor 12 into the skin.
  • the communication interface 22 has an interface circuit for connecting the processing device 20 to the sensor 10. Therefore, the communication interface 22 is connected to the sensor 10, receives the output signal from the load cell 13, and transmits the drive signal to the actuator 14.
  • the memory 23 includes, for example, a volatile semiconductor memory and a non-volatile semiconductor memory.
  • the memory 23 stores the output signal received from the load cell 13.
  • the memory 23 stores a computer program for executing various processes by the CPU 21.
  • the processing device 20 may be provided with an input device such as a keyboard or a mouse in order to improve the operability of the user who operates the processing device 20. Further, the processing device 20 may include a display for displaying the processing result.
  • the senor 10 and the processing device 20 are provided as separate bodies in the present embodiment, the sensor 10 and the processing device 20 may be integrally formed. In this case, for example, the processing device 20 is incorporated in the sensor 10.
  • FIG. 2 is a diagram schematically showing the skin characteristic detection system 1 when the reaction force is measured by the sensor 10.
  • the skin characteristic detection system 1 includes a sensor fixture 30 and a target fixture 40.
  • the sensor fixture 30 is used to fix the sensor 10
  • the target fixture 40 is the skin whose reaction force is to be measured (that is, the skin whose characteristic value is to be detected. In the illustrated example, the cheek of the subject. Used to fix the skin).
  • the sensor fixture 30 includes a first shaft 31 arranged so as to extend vertically, a second shaft 32 fixed to the first shaft 31, and a first shaft 31 and a second shaft.
  • the adjuster 33 for adjusting the relative position with respect to 32 is provided. Therefore, the tip of the second shaft 32 can be arranged at any three-dimensional position.
  • a sensor 10 is attached to the tip of the second shaft 32.
  • the target fixture 40 fixes the target skin so that it does not move during measurement.
  • the head of the subject H is supported so as not to move.
  • the target fixture 40 includes a shaft 41 arranged so as to extend vertically, and a fixing plate 42 fixed to the shaft 41.
  • the fixing plate 42 is configured so that the subject's head rides at a predetermined angle, and fixes the subject's head so as not to move.
  • the sensor 10 moves with respect to the skin to be measured while the actuator 14 is driving the contactor 12 in the direction of pushing it into the skin to be measured or away from the skin, the movement is accompanied by this movement.
  • the reaction force measured by the load cell 13 changes. Therefore, it becomes impossible to accurately measure the transition of the reaction force. Therefore, when driving the contactor 12, the sensor 10 and the skin to be measured need not move with each other and the distance must be constant.
  • the skin to be measured and the sensor 10 are fixed by the target fixture 40 and the sensor fixture 30, respectively, it is possible to prevent the reaction force measured by the load cell 13 from being changed by an external factor. To.
  • FIG. 2 shows an example of a mode in which the reaction force is measured using the sensor 10. Therefore, any fixture may be used as long as the skin to be measured and the sensor 10 do not move with each other and the distance between them is kept constant. Further, the target fixture 40 may also be fixed to the sensor fixture 30. As a result, the sensor 10 fixed by the sensor fixing tool 30 is fixed to the head of the subject (that is, the skin of the target) fixed by the target fixing tool 40. Therefore, the distance between the sensor 10 and the skin to be measured can be more reliably maintained constant.
  • the sensor 10 since the force applied to the skin from the sensor 10 is not so large, it is unlikely that the cheeks and the like will be pushed by the sensor 10 during the measurement, and therefore the skin to be measured is not necessarily fixed by the fixture. May be good. Therefore, for example, as shown in FIG. 3, the sensor 10 may be held by the hand of the measurement target person or an assistant who assists the measurement without using the sensor fixture 30.
  • the senor 10 may be configured so that a part of the sensor 10 other than the contactor 12 comes into contact with the skin when the measurement is performed by the sensor 10. This suppresses changes in the distance between the skin and the sensor during measurement.
  • the sensor 10 is configured so that the tip of the cover 16 comes into contact with the skin when performing a measurement.
  • the cover 16 functions as a fixing member for fixing the relative position of the sensor 10 with respect to the skin.
  • FIG. 4 is a diagram showing the time transition of the displacement of the contactor 12 (the amount of the contactor 12 pushed into the skin) and the reaction force of the skin S when the contactor 12 of the sensor 10 is moved.
  • FIG. 5 is a diagram showing the state of the sensor 10 and the skin S at each stage when measuring the reaction force of the skin S.
  • the sensor 10 is installed so that the tip of the contactor 12 is close to the skin S to be measured while the contactor 12 is contracted. Specifically, the sensor 10 is installed by adjusting the adjusting tool 33 of the sensor fixing tool 30. At this time, since the contactor 12 does not receive the reaction force from the skin S, the reaction force measured by the load cell 13 is zero as shown at time t0 in FIG. 4 (B).
  • the actuator 14 drives the contactor 12 in the direction toward the outside of the sensor 10, that is, in the direction in which the skin S is pushed (the direction indicated by the arrow in FIG. 5A).
  • the actuator 14 moves the contactor 12 at a constant speed. Therefore, the amount of pushing the contactor 12 into the skin S increases at a constant rate.
  • the reaction force from the skin S to the contact 12 gradually increases as the amount of pushing the contact 12 into the skin S increases, as shown in FIG. 4 (B).
  • the movement of the contactor 12 is stopped (time t1). Therefore, the contactor 12 is maintained in a state of being pushed into the skin S as shown in FIG. 5 (B). At this time, the reaction force from the skin S to the contactor 12 gradually decreases due to stress relaxation in the skin S, as shown in FIG. 4 (B).
  • the time for maintaining the contact 12 in the stopped state is the time required for the decrease in the reaction force due to stress relaxation to almost converge, for example, 0.5 to 6 seconds, 0.5 to 4 seconds, or 1 ⁇ 2 seconds.
  • the actuator 14 drives the contactor 12 in the direction toward the inside of the sensor 10, that is, in the direction away from the skin S (the direction indicated by the arrow in FIG. 5C). Therefore, the push of the contactor 12 into the skin is returned.
  • the actuator 14 moves the contactor 12 at a constant speed.
  • the moving speed at this time is the same as the speed at the time of pushing before the time t1. Therefore, the amount of the contactor 12 pushed into the skin S decreases at a constant rate.
  • the reaction force from the skin S to the contact 12 gradually decreases as the amount of pushing the contact 12 into the skin S decreases, as shown in FIG. 4 (B). Then, at time t3, the amount of pushing the contactor 12 into the skin S becomes zero, and at this time, the reaction force measured by the load cell also returns to zero.
  • the processing apparatus 20 detects characteristic values representing various characteristics of the skin based on the reaction force data measured in this way.
  • the actuator 14 increases the amount of the contactor 12 pushed into the skin at a constant speed, then keeps it constant, and then decreases it at a constant speed.
  • the actuator 14 may be driven in a different manner.
  • the actuator 14 may increase the amount of push of the contactor 12 into the skin at a constant speed and then decrease it at a constant speed without maintaining the amount of push at a constant level.
  • ⁇ Parameters related to approximation in a three-element solid model As a parameter representing the characteristics of the skin, the value of each parameter representing this model is detected when the viscoelastic property of the skin is approximated by a three-element solid model (standard linear solid model).
  • FIG. 6 A three-element solid model is shown in FIG. As shown in FIG. 6, in the three-element solid model, the second linear spring having the spring constant k2 and the dashpot having the viscosity coefficient C are arranged in series. In addition, these second linear springs and dashpots arranged in series and the first linear spring having a spring constant k1 are arranged in parallel.
  • ⁇ m ⁇ exp ( ⁇ nt) + C... (3)
  • ⁇ represents a reaction force
  • t time
  • m and n constants.
  • each parameter representing this model that is, each parameter representing the characteristics of the measurement target
  • the value can be identified.
  • FIG. 7 is a diagram similar to FIG. 4 (B) showing the time transition of the displacement of the contact when the contact 12 of the sensor 10 is moved. It is considered that the reaction force on the contactor 12 is not easily affected by the viscosity and is therefore mainly affected by the two linear springs from the start of pushing the contactor 12 into the skin until the pushing is stopped. Be done. Therefore, in the present embodiment, the relationship between the reaction force (that is, the maximum value of the reaction force; “k1 + k2” in FIG. 7) at the time t1 when the pushing into the skin into the contactor 12 is stopped and the displacement amount of the contactor 12. From, the value (k1 + k2) obtained by adding the spring constants k1 and k2 of the two linear springs is approximately calculated.
  • the value (k1 + k2) obtained by adding the spring constants k1 and k2 of the two linear springs is approximated to the elastic change of the reaction force when the amount of the contactor 12 pushed into the skin is increased at a constant speed. It represents the elastic modulus.
  • the first linear spring is based on the relationship between the reaction force (“k1” in FIG. 7) at time t2 immediately before the contact 12 is pushed back into the skin and the amount of the contact 12 pushed into the skin.
  • the spring constant k1 of is approximately calculated.
  • the spring constant k1 of the first linear spring represents an elastic modulus when the reaction force is approximated to change elastically when the amount of pushing of the contactor 12 into the skin is reduced at a constant speed.
  • the spring constant k2 of the second linear spring is calculated by subtracting the spring constant k1 of the first linear spring from the total value (k1 + k2) of the spring constants obtained as described above. That is, in the present embodiment, when the viscoelastic property of the skin is approximated by the three-element solid model in this way, the spring constant k2 of the linear spring connected in series with the dashpot is calculated.
  • the spring constant k2 of this linear spring is an example of the value of the parameter representing the change in the reaction force when the pushing amount by the contactor 12 is kept constant.
  • the constants m and n are identified from the reaction force data between the time t1 and the time t2 by a general approximation method such as the least squares method.
  • the spring constant k2 the total value k1 + k2 of both spring constants, the time constant ⁇ in stress relaxation, and the viscoelasticity coefficient C are calculated.
  • ⁇ Parameters related to the transition of reaction force during pushing ⁇ As a parameter representing the characteristics of the skin, the transition of the reaction force while increasing the amount of the contactor 12 pushed into the skin at a constant speed (in the region surrounded by the broken line in FIG. 8). Parameters related to transition) are used.
  • ⁇ k0 ⁇ d a ... ( 4)
  • k0 is a parameter related to the rigidity of the skin
  • d is the amount of the contactor 12 pushed into the skin.
  • a represents the degree to which the waveform of the reaction force while pushing the skin by the contactor 12 is curved. If the skin is not viscous, the waveform of the reaction force during pushing becomes linear, so it is considered that a is a parameter that changes according to the viscosity of the skin.
  • a is an example of a parameter representing the non-linearity of the reaction force with respect to the pushing amount when the pushing amount of the contact 12 into the skin is increased at a constant speed.
  • the parameter a represents the non-linearity of the reaction force
  • k0 is the skin in consideration of the non-linearity of the reaction force when the amount of pushing the contactor 12 into the skin is increased at a constant speed. It can be said that it is a parameter representing rigidity.
  • the constants k0 and a are identified from the reaction force data between the time t0 and the time t1 by a general approximation method such as the least squares method.
  • a parameter representing the characteristics of the skin a parameter relating to the integrated value of the reaction force while the contactor 12 is being pushed into the skin and while the contactor 12 is being pushed back is used.
  • FIG. 9 is a diagram similar to FIG. 4 (B) showing the time transition of the displacement of the contact 12 when the contact 12 of the sensor 10 is moved.
  • FIG. 10 is a diagram showing the relationship between the movement distance of the contactor 12 and the reaction force during the period in which the contactor 12 is being moved.
  • FIG. 10A shows the relationship between the moving distance of the contactor 12 and the reaction force when the contactor 12 is pushed into the skin (period M in FIG. 9)
  • FIG. 10B shows the relationship. It is a figure which shows the relationship between the movement distance of the contactor 12 and the reaction force at the time of returning the pushing of the contactor 12 into the skin (period N of FIG. 9).
  • WC in FIG. 10A is an integrated value obtained by integrating the reaction force while pushing the contactor 12 into the skin with the moving distance of the contactor 12.
  • WC represents the energy stored in the skin while pushing the contactor 12 into the skin.
  • the reaction force measured from the start of pushing when the moving distance is 0 to the completion of pushing when the moving distance is d1 is used.
  • the WC is calculated by integrating.
  • RWC in FIG. 10B is an integrated value obtained by integrating the reaction force while the contactor 12 is being pushed back into the skin by the moving distance of the contactor 12.
  • the RWC represents the energy released from the skin when the contactor 12 is being pushed back into the skin.
  • the RWC starts pushing back in the state where the moving distance is 0 until the pushing back is completed in the state where the moving distance is d1. It is calculated by integrating the reaction force measured in.
  • RC is calculated by dividing the RWC calculated as described above by WC.
  • the energy stored in the skin while pushing the contactor 12 into the skin is It is represented as the area X of the triangle shown by the broken line in FIG.
  • the value of LC becomes 1 if the waveform of the reaction force while pushing the skin by the contactor 12 is linear, and becomes a value away from 1 as the degree of curvature of the waveform of the reaction force during this period increases.
  • LC is calculated based on the reaction force until the contactor 12 stops pushing into the skin.
  • LC may be calculated based on the reaction force from the start of pushing the skin into the contact 12 to any time point before stopping the pushing of the contact 12 into the skin.
  • the integrated value of the reaction force from the start of the increase in the pushing amount to the time when the pushing amount reaches the predetermined amount when the pushing amount and the reaction force are assumed to increase at a constant speed. It can be said that it is the ratio of.
  • the actuator 14 increases the amount of push of the contactor 12 into the skin at a constant speed, then keeps it constant, and then decreases it at a constant speed. In this case, it is possible to calculate the values of all the above-mentioned parameters as the characteristic values related to the characteristics of the skin.
  • the actuator 14 when the actuator 14 is driven in a different mode, it is not always possible to calculate the values of all the parameters.
  • the actuator 14 may increase the amount of push of the contactor 12 into the skin at a constant speed and then decrease at a constant speed without maintaining the amount of push.
  • the parameter values that can be calculated by keeping the amount of the contactor 12 pushed into the skin constant for example, the values of k2, ⁇ , and C are not calculated.
  • the values of other parameters that are calculated regardless of maintaining the amount of the contactor 12 pushed into the skin constant can be calculated.
  • the parameters k2, k0, a, WC, RC, and LC have a high correlation with the sensory evaluation results regarding the feeling of flexibility by a skilled evaluator.
  • the parameters k1 + k2 and C also have a relatively high correlation with the sensory evaluation results regarding the feeling of flexibility by a skilled evaluator. Therefore, these parameters can be used as a new index indicating the softness of the skin. That is, according to the skin characteristic detection system 1 described above, it can be said that it is possible to detect the value of a parameter that is a new index indicating the softness of the skin.
  • FIG. 11 is a diagram showing the average value of the parameter k2 for each age group of the subjects.
  • the I-shaped display in the figure indicates a standard error (hereinafter, the same applies to FIGS. 12 to 14).
  • the value of the parameter k2 is small at 21 to 24 years old (that is, the change in reaction force when the pushing amount by the contactor 12 is kept constant is small), whereas it is 39 to 44 years old.
  • the value of k2 increases as the age increases from 61 to 68 years old. Therefore, it can be said that the parameter k2 represents the difference in the softness of the skin depending on the age.
  • FIG. 12 is a diagram showing the average value of the parameter a for each age group of the subjects.
  • the value of the parameter a is small at the age of 21 to 24 (that is, the degree of curvature of the reaction force waveform while pushing the skin by the contactor 12 is small).
  • the value of a is large in 39-44 years old and 61-68 years old. Therefore, it can be said that the parameter a represents the difference in the softness of the skin depending on the age.
  • FIG. 13 is a diagram showing the average value of the parameter RC for each age group of the subjects.
  • the RC value is large at 21 to 24 years old (that is, the proportion of energy not released by stress relaxation is small), whereas the age groups are 39 to 44 years old and 61 to 68 years old.
  • the value of RC decreases as it increases. Therefore, it can be said that the parameter RC also represents the difference in the softness of the skin depending on the age.
  • FIG. 14 is a diagram showing the average value of the parameter k1 for each age group of the subjects. As can be seen from FIG. 14, the value of k1 does not show a constant tendency according to age. Therefore, it cannot be said that the parameter k1 does not necessarily represent the difference in the softness of the skin depending on the age.
  • the parameters other than the parameters k2, k0, a, WC, RC and LC have a high correlation with the softness of the skin.
  • these parameters can also be used as parameters representing the characteristics of the skin.
  • the values of a large number of parameters related to the skin properties can be detected by one simple test, and thus the skin can be easily evaluated.

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  • Heart & Thoracic Surgery (AREA)
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  • Measuring And Recording Apparatus For Diagnosis (AREA)
  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)

Abstract

Système de détection de caractéristique de la peau (1), qui détecte une valeur de caractéristique indiquant la caractéristique de la peau, comprenant : un dispositif de régulation de quantité de pression (14) qui régule une quantité de pression d'un contacteur (12) sur la peau ; un dispositif de mesure de force de réaction (13) qui mesure la force de réaction appliquée au contacteur provenant de la peau ; et un dispositif de détection (20) qui détecte la valeur de caractéristique sur la base de la force de réaction mesurée. Le dispositif de régulation de quantité de pression exécute une augmentation de la quantité de pression du contacteur sur la peau à vitesse constante et/ou un maintien de la quantité de pression constante après que le contacteur a pressé la peau. La valeur de caractéristique comprend un paramètre indiquant une non-linéarité de la force de réaction à la quantité de pression lorsque la quantité de pression du contacteur sur la peau est augmentée à une vitesse constante, un paramètre indiquant un changement de la force de réaction lorsque la quantité de pression est maintenue constante, ou similaire.
PCT/JP2019/051284 2019-12-26 2019-12-26 Système de détection de caractéristique de la peau et procédé de détection de caractéristique de la peau WO2021130998A1 (fr)

Priority Applications (4)

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PCT/JP2019/051284 WO2021130998A1 (fr) 2019-12-26 2019-12-26 Système de détection de caractéristique de la peau et procédé de détection de caractéristique de la peau
CN202080090258.9A CN114885600A (zh) 2019-12-26 2020-12-25 皮肤特性检测系统、皮肤特性检测方法、皮肤年龄推定用片材或卡片、柔软感推定用片材或卡片、效果验证方法、皮肤年龄比较方法及柔软感比较方法
PCT/JP2020/048974 WO2021132656A1 (fr) 2019-12-26 2020-12-25 Système de détection de caractéristiques de la peau, procédé de détection de caractéristiques de la peau, feuille ou carte d'estimation de l'âge de la peau, feuille ou carte d'estimation de la sensation de douceur, procédé de vérification d'effet, procédé de comparaison de l'âge de la peau, et procédé de comparaison de la sensation de douceur
JP2021567721A JPWO2021132656A1 (fr) 2019-12-26 2020-12-25

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PCT/JP2020/048974 WO2021132656A1 (fr) 2019-12-26 2020-12-25 Système de détection de caractéristiques de la peau, procédé de détection de caractéristiques de la peau, feuille ou carte d'estimation de l'âge de la peau, feuille ou carte d'estimation de la sensation de douceur, procédé de vérification d'effet, procédé de comparaison de l'âge de la peau, et procédé de comparaison de la sensation de douceur

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009240374A (ja) * 2008-03-28 2009-10-22 Osaka Univ 皮膚特性測定装置および皮膚特性測定プログラム
US20110054354A1 (en) * 2009-09-01 2011-03-03 Massachusetts Institute Of Technology Nonlinear System Identification Techniques and Devices for Discovering Dynamic and Static Tissue Properties
WO2016194468A1 (fr) * 2015-06-05 2016-12-08 日立マクセル株式会社 Système de calcul de la viscoélasticité et procédé de mesure de la viscoélasticité

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009240374A (ja) * 2008-03-28 2009-10-22 Osaka Univ 皮膚特性測定装置および皮膚特性測定プログラム
US20110054354A1 (en) * 2009-09-01 2011-03-03 Massachusetts Institute Of Technology Nonlinear System Identification Techniques and Devices for Discovering Dynamic and Static Tissue Properties
WO2016194468A1 (fr) * 2015-06-05 2016-12-08 日立マクセル株式会社 Système de calcul de la viscoélasticité et procédé de mesure de la viscoélasticité

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