Method for evaluating tactile sensation or physical property and device for evaluating tactile sensation or physical property

Abstract

To provide a method for evaluating the tactile sensation or the physical property of a predetermined agent for a period of time including a plurality of stages, and a device for evaluating a tactile sensation or a physical property.SOLUTION: The method for evaluation is a method for evaluating the tactile sensation of a predetermined agent on the basis of different types of feature amounts calculated from time-series data of an object on which a predetermined agent is applied and a mechanical physical quantity generated between the object and an active body by making the active body operate. The method is for evaluating a tactile sensation of a predetermined agent in a period of time including a first stage and a second state different from the first stage and also evaluating a physical property which generates the tactile sensation.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a method for evaluating the tactile feel or physical properties of a given agent over a period including multiple stages, and an apparatus for evaluating the tactile feel or physical properties. [Background technology]

[0002] There is an evaluation method in which a moving object is moved while being brought into contact with a cosmetic applied to the skin, etc., to detect vibrations generated, and the tactile sensation of the cosmetic when used is evaluated based on the change over time in the frequency spectrum of the detected vibrations (Patent Document 1). In addition, there is a method for evaluating the feel of a specific agent at a plurality of timings, such as immediately after application of the specific agent and after a specific time has elapsed (Patent Document 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2019 / 039466 [Patent Document 2] JP 2016-204343 A Summary of the Invention [Problem to be solved by the invention]

[0004] Patent Document 1 merely quantifies the change in vibration intensity over time, and is unable to properly evaluate the characteristics of the tactile sensation and its changes. Patent Document 2 evaluates the feel of a specific agent at each of a plurality of timings, but does not evaluate the feel of the specific agent over the entire period including the plurality of timings.

[0005] The present invention has been made in consideration of the above-mentioned problems, and relates to a method for evaluating the tactile feel of a specified agent or the physical properties that produce said tactile feel based on multiple types of feature quantities calculated from time series data of mechanical physical quantities that arise between an object to which a specified agent has been applied and a moving body by operating the object, and relates to an evaluation method and evaluation device that evaluates the tactile feel of a specified agent or the physical properties that produce said tactile feel for a period that includes at least a first stage and a second stage that is different from the first stage. [Means for solving the problem]

[0006] The present invention provides an evaluation method for evaluating the tactile sensation of the object or the physical properties that produce the tactile sensation by operating a moving object in contact with an object to which one or more predetermined agents have been applied, acquiring time series data of mechanical physical quantities occurring between the object and the moving object, calculating a plurality of types of feature amounts for each predetermined period of a predetermined stage from the acquired time series data of mechanical physical quantities, and evaluating the tactile sensation of the object or the physical properties that produce the tactile sensation based on the plurality of types of feature amounts, wherein the predetermined stage has at least a first stage and a second stage that are different periods from each other in time, and the method includes operating the moving object in contact with the object in the first stage and the second stage. the first stage and the second stage are at least one of the following: the specified agent is different from each other; the environments of the object to which the specified agent is applied are different from each other; and the objects are different from each other; a first tactile value in the first stage and a second tactile value in the second stage are specified using the multiple types of feature amounts calculated for each specified period; and the tactile feel or the physical properties that produce the tactile feel are evaluated for a period including the first stage and the second stage in which the moving body is brought into contact with the object based on the first tactile value and the second tactile value.

[0007] The present invention also relates to an evaluation device comprising: an acquisition means for acquiring time series data of mechanical physical quantities occurring between an object to which one or more predetermined agents have been applied, by operating a moving body brought into contact with the object; a calculation means for calculating a plurality of types of feature quantities for each predetermined period of a predetermined stage from the acquired time series data of mechanical physical quantities; and an evaluation means for evaluating the tactile sensation of the object or physical properties that produce the tactile sensation, based on the plurality of types of feature quantities. The predetermined stage has at least a first stage and a second stage, which are periods different from each other in time, and the operating body brought into contact with the object in the first stage and the second stage is evaluated. and operates the device to acquire the time series data, and the first stage and the second stage are at least one of the following: the specified agent is different from each other, the environments of the object to which the specified agent is applied are different from each other, or the objects are different from each other; the device further includes an identification means for identifying a first tactile value in the first stage and a second tactile value in the second stage using the multiple types of feature amounts calculated for each specified period, and the evaluation means evaluates the tactile feel or the physical properties that produce the tactile feel for a period including the first stage and the second stage in which the moving body is brought into contact with the object based on the first tactile value and the second tactile value. Effect of the Invention

[0008] The method provided by the present invention makes it possible to evaluate the tactile sensation or the physical properties that produce said tactile sensation during a period that includes at least the first stage and the second stage. [Brief description of the drawings]

[0009] [Figure 1] (1) is an image of a finger with a sensor attached touching the surface of the evaluator's skin during washing, and (2) is an image of a finger with a sensor attached touching the surface of the evaluator's skin during rinsing. [Diagram 2] 13A is a diagram showing a time-series waveform signal of Sample 1, and FIG. 13B is a diagram showing a time-series waveform signal of Sample 3. FIG. [Diagram 3]1 is a conceptual diagram illustrating calculation of a plurality of types of feature amounts from a time-series waveform signal. [Figure 4] 13A is a diagram for explaining the spike signal amount of Sample 1, FIG. 13B is a diagram for explaining the spike signal amount of Sample 2, and FIG. 13C is a diagram for explaining the spike signal amount of Sample 3. FIG. [Diagram 5] (1) is a graph showing the correlation between the average value and variation of Sample 1, (2) is a graph showing the correlation between the average value and variation of Sample 2, (3) is a graph showing the correlation between the average value and variation of Sample 3, and (4) is a graph showing the correlation between the average value and variation of Sample 4. [Figure 6] FIG. 13 is a diagram showing the distance from the origin of each plot. [Figure 7] FIG. 1 is a diagram showing a coordinate system in which the horizontal axis represents x' values ​​and the vertical axis represents y'' values. [Figure 8] (1) is a graph using the coordinate system of FIG. 7 (beginning of rinsing (first period)), and (2) is a graph using the coordinate system of FIG. 7 (first half of rinsing (fourth period)). [Figure 9] (1) is a graph using the coordinate system of FIG. 7 (middle rinsing stage (fifth period)), and (2) is a graph using the coordinate system of FIG. 7 (late rinsing stage (seventh period)). [Figure 10] This is a graph using the coordinate system of Figure 7 (end of rinsing (9th period)). [Figure 11] (1) is a diagram summarizing Figures 8 to 10 of Sample 1, (2) is a diagram summarizing Figures 8 to 10 of Sample 2, (3) is a diagram summarizing Figures 8 to 10 of Sample 3, and (4) is a diagram summarizing Figures 8 to 10 of Sample 4. [Figure 12] (1) is a conceptual diagram of a time variation graph with the x' value as the representative, and (2) is a time variation graph with the x' value as the representative. [Figure 13] (1) is a graph of time variation with the x' value as the representative (time change of each cleaning agent (during cleaning)), and (2) is a graph of time variation with the x' value as the representative (time change of each cleaning agent (during rinsing)). [Figure 14](1) is a graph explaining a method for determining a tactile value, and (2) is a graph (diagram) explaining a method for determining a tactile value. [Figure 15] (1) is a graph explaining a method for determining a tactile value, and (2) is a graph (diagram) explaining a method for determining a tactile value. [Figure 16] (1) is a graph (diagram) explaining a method for determining a tactile value, and (2) is a diagram explaining the method for determining a tactile value. [Figure 17] 1 is a graph using first tactile values ​​and second tactile values. [Figure 18] 1 is a flowchart of a tactile evaluation method. [Figure 19] FIG. 2 is a block diagram of a tactile evaluation device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. The drawings of the present embodiment are all intended to explain the technical concept, configuration, and operation of the present invention, and are not intended to specifically limit the configuration. In addition, in all drawings, similar components are given similar reference numerals, and duplicated descriptions are omitted as appropriate.

[0011] The evaluation method in this embodiment (hereinafter, sometimes referred to as this method) will be outlined below. The evaluation method of this embodiment is an evaluation method in which a moving body is placed in contact with an object to which one or more specified agents have been applied, and time series data of mechanical physical quantities occurring between the object and the moving body is obtained, multiple types of feature quantities are calculated for each specified period of a specified stage from the obtained time series data of mechanical physical quantities, and the tactile feel of the object or the physical properties that produce the tactile feel are evaluated based on the multiple types of feature quantities. The term "one or more specified agents" refers to one or more agents, such as lotion only, lotion and emulsion, or lotion, emulsion and foundation. The term "predetermined agent" refers to an agent that is applied to an object in the form of a liquid (including mist), paste, solid, or powder. Examples of the agent include external skin agents, cosmetics, sheet-type skin care cosmetics, dishwashing detergent, household detergent, body cleansing agent, face wash, and hair cleansing agent, and other cleansing agents, including lotions, milky lotions, creams, beauty essences, massage, packs, lip balms, eye care sheets, mouth sheets, pack masks, sheet-type lotions, and sheet-type makeup removers; foundations, makeup bases, liquid foundations, oily foundations, powder foundations, concealers, control colors, eye shadows, blushers, lipsticks, lip glosses, lip liners, and makeup cosmetics for the décolleté of the body; UV protection cosmetics such as sunscreen milky lotions, sunscreen gels, and sunscreen creams; body cleansing agents; and solid soaps, hand soaps, and body soaps, but are not limited thereto. The term "object" refers to the surface of human skin, the surface of artificial skin, hair, and scalp, as well as tableware, building materials, and other objects to which a specific agent is applied. The "moving object" is another object that is brought into contact with the object, and examples of such objects include the finger 20, palm, massager, or measuring tool that is brought into contact. The sensor 30 shown in FIG. 1 is attached to the finger 20, palm, skin care product, or measuring tool. The finger 20 that is brought into contact with the object may be any position on the finger 20, but the finger pad is preferred because the tactile sensation is often confirmed with the finger pad. When checking the tactile sensation of an object, not only one finger but also multiple fingers may be used, and the palm may be brought into contact with the skin surface because the tactile sensation is sometimes confirmed by contacting not only the fingers but also the entire palm. The measuring tool is a tool that is brought into contact with the skin surface in the same way as the finger. The structure and composition of the part of the measuring tool that is brought into contact with the skin surface are not limited, but by forming the part with artificial skin that imitates human skin, it becomes possible to measure physical quantities that are close to those when a person touches the surface of an object with a finger or palm. The "action" is an action of contacting an action body with an object, such as performing a movement action (tapping action) of a finger in an outward, approximately vertical direction on the object at least once, or sliding a finger in a horizontal direction on the object at least once. The "action" also includes a "repeated action" in which the action is repeated. The "repeated action" refers to continuing the action of continuously contacting the action body with the object, or repeating the action of intermittently contacting the action body with the object. Specifically, it refers to performing a repetitive movement action (tapping action) of a finger in an outward, approximately vertical direction on the object, or performing a repetitive movement action of sliding a finger in a horizontal direction on the object. In the case of a sliding movement action, any of the following may be performed: a repetitive movement action in one direction, a repetitive movement action by reciprocating, or a repetitive movement action in a circular motion. "Time series data of mechanical physical quantities occurring between an object and a moving body" refers to physical quantities related to mechanics occurring between the object and the moving body by moving the moving body (e.g., a finger) in contact with the object. Examples include the magnitude of elastic force or frictional force that the moving body receives from the object (skin), the amount of current or voltage caused by the displacement of the object, the pressure that the moving body receives, the distortion caused by the moving body, or the vibration amount (amplitude), frequency, speed and acceleration of the vibrating moving body. The tactile sensation evaluated in this method is the tactile sensation caused by contacting the surface of an object with a finger or palm, such as sticky, refreshing, moist, and tight. The term "acquire" will be described in more detail below, but for example, it means that the sensor 30 shown in FIG. 1 detects vibrations and deformations caused by continuously contacting a moving body with an object, and outputs the vibrations and deformations as electrical signals to a computing device. The "predetermined stage", which will be described in detail later, is a stage when moving a moving object that has been brought into contact with an object to which a predetermined agent has been applied, and is also called a phase. "Calculating a plurality of types of feature amounts at a predetermined time interval" means calculating a plurality of types of feature amounts at a predetermined time interval from the start of moving the moving body relative to the object from the acquired time series data of the mechanical physical amount. The details of the calculation will be described later. The "multiple types of feature quantities" are, for example, mechanical physical quantities, statistics of mechanical physical quantities, spike signal quantities that are values ​​equal to or greater than a predetermined threshold value of mechanical physical quantities or statistics of mechanical physical quantities, and feature quantities calculated from average values ​​or variations that are statistics of mechanical physical quantities, as will be described in detail later. The mechanical physical quantities include not only the measured values ​​themselves but also calculated values ​​(e.g., values ​​obtained by removing noise, values ​​multiplied by coefficients, etc.). The statistics of mechanical physical quantities include not only statistics using the measured values ​​of the mechanical physical quantities themselves (e.g., average values, standard deviations, maximum values, minimum values, kurtosis, skewness, etc.) but also statistics using calculated values ​​of the mechanical physical quantities. The statistics of mechanical physical quantities also include values ​​that can be calculated by frequency analysis of the mechanical physical quantities, such as power values ​​of the spectrum at each time. These feature quantities may be calculated after frequency decomposition or filtering of the waveform of the acquired mechanical physical quantities. The spike signal quantities include not only those calculated from the measured values ​​of the mechanical physical quantities themselves but also those calculated from those using calculated values ​​of the mechanical physical quantities. The spike quantities will be described later. Furthermore, the feature calculated from the average value or variation, which is a statistical quantity of a mechanical physical quantity, is, for example, the distance from the origin calculated from the correlation between the average value and the variation (the distance from the origin will be described later). "Evaluating the tactile sensation of an object or evaluating the physical properties that produce the tactile sensation" refers to the tactile sensation when an object coated with a specific agent is touched by a moving body, and evaluating the type of tactile sensation, or evaluating the physical properties that produce the tactile sensation, since the tactile sensation is produced by the physical properties of the specific agent. Examples of tactile sensations include "sticky," "refreshing," "moist," "sticky," "moisture," "dry," "firm," "elastic," "soft and hard," "soft and chewy," "plump," "smooth," "slippery," "oily," "rich," "comfortable," "dry," "stiff," "tight," "tight," "squeaky," and "slippery," but are not limited to these. The tactile sensation referred to here is the tactile sensation felt through receptors such as fingers by touching an object with fingers or palms (hereinafter referred to as "fingers, etc."), and may also include thermal sensations such as coldness and warmth felt by touching an object with fingers, etc. Here, "sticky" refers to the feeling of the skin sticking to the finger when the finger touches the object. "Refreshing" refers to the feeling of the skin sticking to the finger without any sticky feeling when the finger touches the object. "Moist" refers to the feeling of the skin being slightly damp and smooth when the finger touches the object. "Sticky" refers to the feeling of the skin being slightly sticky when the finger touches the object. "Moist" refers to the feeling of the skin being moderately moist when the finger touches the object. "Dry" refers to the feeling of the skin being dry when the finger touches the object. "Firmness" refers to the feeling of the skin being stiff and taut when the finger touches the object. "Elasticity" refers to the feeling of the skin bouncing back without any sinking feeling when the finger touches the object. "Hardness" refers to the degree to which the skin is deformed when the finger touches the skin surface. "Sticky" refers to the feeling that your fingers stick to the surface when you touch it. "Soft" refers to the feeling that your fingers stick to the surface a little and then bounce back when you touch it. "Fluffy" refers to the feeling that your fingers are slightly elastic and don't stick to the skin surface when you touch it, giving a refreshing feeling. "Smooth" refers to the feeling that your fingers move without any snags when you touch it to an object, especially when a cream has been applied, and that your fingers move naturally."Slippery" refers to the feeling that the finger slides easily when touching an object, especially when a cosmetic agent is applied, due to the adhesiveness of the agent. "Smooth" refers to the feeling of the softness of the skin and the ability of the finger to move without catching when touching an object. "Oily" refers to the feeling that the finger sticks to the object when touching it. "Rich" refers to the feeling that the finger feels the texture of the agent when touching an object, especially when applying the agent, the texture when spreading, and the weight when spreading. "Fit" refers to the feeling that the finger does not feel strange when touching an object, especially when applying the agent, and the feeling that the finger does not feel the texture of the agent on the object. "Rough" refers to the feeling that the finger feels rough when touching an object. "Tight" or "tight" refers to the feeling of resistance when touching an object and starting to slide the finger on the object, or while sliding the finger. "Squeaky" refers to the feeling of something catching and rubbing against something. "Slippery" refers to the feeling of something not catching much and allowing your fingers to slide easily.

[0012] In addition, in the evaluation method of this embodiment, the specified stage has at least a first stage and a second stage which are different periods in time, and in the first stage and the second stage, a moving object in contact with an object is moved to obtain time series data. The "predetermined stage" refers to a stage at which a moving object is brought into contact with an object to which a predetermined agent has been applied, and includes a first stage, a second stage, etc., which are of different periods in time.

[0013] In addition, the first stage and the second stage are at least one of the following: the specified agents are different from each other, the environments of the objects to which the specified agents are applied are different from each other, or the objects are different from each other. "The first stage and the second stage have different specified agents" means that the agent applied to the object is different in the first stage and the second stage, specifically, lotion in the first stage and emulsion in the second stage, or lotion in the first stage and emulsion applied on top of the lotion applied in the first stage in the second stage, or a makeup base in the first stage and a foundation applied on top of the makeup base applied in the first stage in the second stage, etc. "The first and second stages are different environments for the object to which a specified agent is applied" means that the location and state in which the object is present are different between the first and second stages, such as indoors / outdoors, humidity, temperature, whether it is exposed to sunlight or lighting, whether it is exposed to wind, whether it is wet, etc. Specifically, when hand soap is applied to an object, the first stage is a state where the object is not splashed with water (i.e., the washing stage) and the second stage is a state where the object is splashed with water (i.e., the rinsing stage); or when sunscreen is applied to the object, the first stage is a state where the object is not exposed to much ultraviolet light (e.g., indoor stage) and the second stage is a state where the object is exposed to ultraviolet light (e.g., outdoor stage); or when cream is applied to the object, the first stage is a state where the humidity is low and the second stage is a state where the humidity is high; or when foundation is applied to the object, the first stage is an indoor state with a temperature of 20 degrees and the second stage is an outdoor state with a temperature of 30 degrees. "The objects to which the specified agent is applied are different in the first stage and the second stage" means that the objects themselves are different in the first stage and the second stage, specifically, a body and hair shampoo is applied to the body in the first stage and to the head in the second stage, or a cream is applied to the face in the first stage and to the hands in the second stage. It is preferable that the first stage and the second stage have something in common, such as a common object, a common prescribed agent to be applied, etc. By evaluating the tactile sensation over a period including multiple stages for multiple stages having something in common, it becomes possible to evaluate the overall tactile sensation.

[0014] Furthermore, the evaluation method of this embodiment uses a plurality of types of feature amounts calculated at predetermined intervals to identify a first tactile value in the first stage and a second tactile value in the second stage. The "first tactile value" is a value determined using multiple types of feature quantities calculated at predetermined intervals in the first stage, and is, for example, a mechanical physical quantity in the first stage, as will be described in detail later. The "second tactile value" is a value determined using multiple types of feature quantities calculated at predetermined intervals in the second stage, and is, for example, a mechanical physical quantity in the second stage, as will be described in detail later.

[0015] In addition, the evaluation method of this embodiment evaluates the tactile sensation or the physical properties that produce the tactile sensation during a period including the first stage and the second stage in which the moving body is in contact with the object, based on the first tactile value and the second tactile value. "Evaluating the tactile feel during the period including the first stage and the second stage or the physical properties which produce that tactile feel" means using the first tactile value and the second tactile value to evaluate the tactile feel during the period including the first stage and the second stage or the physical properties of a specified agent, in particular, the tactile feel throughout the first stage and the second stage or the physical properties which produce that tactile feel. "Evaluating" does not only mean plotting the specified first tactile value and second tactile value on a single axis or multiple axes and quantitatively evaluating based on the plotted position, but also includes evaluating by comparison with a predetermined standard value, and evaluating by comparison with the first tactile value and the second tactile value of a material other than the material being evaluated. In this way, it is possible to evaluate the overall tactile sensation or the physical properties that produce that sensation over a period that includes multiple stages in which different agents are applied to the object, multiple stages in which the environments of the object to which the agent is applied are different, and multiple stages in which the object to which the agent is applied is different.

[0016] A method for acquiring time-series data on mechanical physical quantities occurring between an object to which a specific agent has been applied and a moving body is shown. <Method of acquiring time series data of mechanical physical quantities> 1, in this embodiment, the "object" is the skin of a person's arm (the skin surface of the person's arm), and the "moving object" is a finger 20 in contact with the person's arm. The "predetermined agent" to be applied to the object is a cleaning agent 40, the "first stage" is a cleaning state, and the "second stage" is a rinsing state. As shown in FIG. 1, a sensor 30 is attached to a finger 20. When the finger 20, particularly the finger pad (hereinafter, the finger pad is also referred to as the finger), touches the skin of the arm to which the cleaner 40 has been applied, and the touched finger 20 is moved, vibrations and deformations occur in the finger skin, and the sensor 30 detects these vibrations and deformations and outputs them as electrical signals to the computing device 10. Since the vibrations and deformations occurring in the finger skin differ depending on the tactile sensation, the electrical signals outputted depending on the tactile sensation also differ. This outputted electrical signal corresponds to the "mechanical physical quantity" of the present invention, and the electrical signals are acquired over time. The sensor 30 is only required to acquire the mechanical physical quantity generated by the touch with the finger 20, and may be, for example, a sensor (multi-axis sensor, force sensor) capable of acquiring the acceleration or force generated by removing the finger 20 from the skin. Acquiring a physical quantity over time includes not only a mode in which the sensor 30 continuously acquires analog information (electrical signal in this embodiment) indicating the physical quantity over a predetermined time, but also a mode in which the sensor 30 acquires the physical quantity as digital information multiple times at short intervals such as on the order of milliseconds or sub-milliseconds. When the sensor 30 continuously acquires the physical quantity as analog information, it is preferable that the computing device 10 samples and discretizes the analog information at predetermined short intervals such as on the order of milliseconds or sub-milliseconds.

[0017] 1, in this embodiment, the finger 20 equipped with the sensor 30 is brought into contact with the skin (skin surface) of the arm, and the finger 20 is repeatedly slid in a substantially horizontal direction against the skin. The repeated movement may be in any form, such as repeated movement in one direction, repeated movement by reciprocating, or repeated movement in a circular motion. Also, as shown in Fig. 1(1), a cleaning agent 40 is applied to the skin of an arm, and the mechanical physical quantity occurring between the skin of the arm and the finger 20 is acquired when the finger 20 is repeatedly moved. That is, Fig. 1(1) acquires the mechanical physical quantity between an object (corresponding to the skin of the arm) to which a specific agent (corresponding to the cleaning agent 40) has been applied and a moving body (corresponding to the finger 20), and the object is cleaned by moving the moving body. The state of cleaning the object corresponds to the first state. Also, as shown in Fig. 1(2), the mechanical physical quantity occurring between the arm skin and the finger 20 is acquired when the finger 20 is repeatedly moved while water is flowing on the arm skin to which the detergent 40 has been applied. That is, in Fig. 1(2), water is flowed on an object (corresponding to the arm skin) to which a specific agent (corresponding to detergent 40) has been applied, and the mechanical physical quantity between the object and the moving body (corresponding to the finger 20) is acquired, and the object is rinsed by moving the moving body. The state of rinsing the object corresponds to the second state. When measuring using a measuring tool, a sensor 30 is provided on a measuring tool (not shown) instead of the finger 20 in Fig. 1, the measuring tool is brought into contact with the skin (skin surface), and the measuring tool is moved so as to slide horizontally against the skin (skin surface), thereby making it possible to measure the generated physical quantity in a similar manner. When measuring by moving the measuring tool in contact with the skin, the movement of the measuring tool may be controlled using a predetermined device (not shown) so that the movement is uniform.

[0018] FIG. 2 shows the electrical signal waveform of the acquired mechanical physical quantity. As shown in FIG. 2, in this embodiment, the vibration occurring between the object and the moving body is acquired as the mechanical physical quantity. In FIG. 2(1), the applied predetermined agent is Sample 1, and in FIG. 2(2), the applied predetermined agent is Sample 3. Comparing FIG. 2(1) and FIG. 2(2), for example, the signal strength is uniform within a certain range in (1), whereas the signal strength is clearly strong and weak in (2), and the shape of the acquired signal waveform differs depending on the applied predetermined agent. Therefore, by analyzing the acquired mechanical physical quantity (signal waveform), it is possible to evaluate the tactile sensation or the physical properties that generate the tactile sensation.

[0019] <Method of calculating multiple types of feature quantities> A method for calculating a plurality of types of feature amounts will be described. FIG. 3 shows the signal waveform of the acquired mechanical physical quantity. The acquired signal waveform is cut out at predetermined intervals. The dotted frame shown in the signal waveform indicates each predetermined interval. Note that the dotted frame shown in FIG. 3 is only a part, and the dotted frame is actually provided continuously. That is, the cut-out predetermined interval is provided continuously. For each cut-out predetermined interval (first period, second period, third period, etc.), the average signal strength, standard deviation, and spike amount are calculated based on the signal waveform (electrical signal) included in the predetermined interval. The average signal strength is the average of the absolute values ​​of the signal within the predetermined interval, and the standard deviation is obtained from the calculated average. Note that in this embodiment, the average signal strength is described as the "x value", the standard deviation of the signal strength is described as the "y' value", and the spike amount is described as the "y'' value. In this embodiment, the predetermined interval is set to 2 seconds. If the specified interval is too short, there will not be enough time to move the moving body back and forth, and if it is too long, the specified agent will change and there is a possibility that multiple characteristics will be included within the period, so in this embodiment it is set to 2 seconds, but the number is not limited to this.

[0020] Here, a method for calculating spikes and the amount of spikes will be described. Figure 4(1) shows the signal waveform of the vibration generated between the object and the moving body when the specified agent applied is Sample 1, Figure 4(2) shows the signal waveform of the vibration generated between the object and the moving body when the specified agent applied is Sample 2, and Figure 4(3) shows the signal waveform of the vibration generated between the object and the moving body when the specified agent applied is Sample 3. For each signal waveform, attention is paid to the portion where the signal strength exceeds a first predetermined value (for example, 0.2 [V] or -0.2 [V]) and the timing where the signal strength exceeds a second predetermined value (for example, 0.4 [V] or -0.4 [V]). A signal that exceeds a predetermined threshold (in the case of FIG. 4, the first predetermined value and the second predetermined value) is defined as a "spike". In the case of FIG. 4 (1), spikes that exceed the first predetermined value occur from the middle onwards, and spikes that exceed the second predetermined value do not occur. From these, it can be said that the vibration is sharp. In the case of FIG. 4 (2), spikes that exceed the first predetermined value do not occur in the first half, and spikes that exceed the second predetermined value do not occur. From these, it can be said that the density of the signal waveform is high and the vibration is not sharp (the vibration is constant). In the case of FIG. 4 (3), many spikes that exceed the first predetermined value occur, and many spikes that exceed the second predetermined value occur from the middle onwards. From these, it can be said that the density of the signal waveform is sparse, the difference in vibration strength is large, and the vibration is strongly sharp. An index showing the amount of this "spike" is calculated as a "spike amount". The spike amount is calculated by determining whether or not there is a signal with a larger absolute value than a signal within a predetermined time before and after the signal at a certain time, and if there is no signal with a larger absolute value, the signal is regarded as a "spike". The sum of the absolute values ​​of the signals is calculated as the "spike amount" at a certain time. In this embodiment, the certain time is set to a predetermined interval (time surrounded by a dotted line frame) shown in FIG. 3, and the spike amount is calculated with the predetermined time before and after as 0.075 sec. Therefore, in this embodiment, the average for each predetermined time, the standard deviation for each predetermined time, and the spike amount for each predetermined time are calculated from the acquired mechanical physical quantity. Note that these values ​​may be calculated from the value of the acquired mechanical physical quantity itself, or may be calculated from a value (calculated value) after a predetermined noise removal, since the acquired mechanical physical quantity is likely to contain noise. In this embodiment, the spike amount is calculated with the predetermined time before and after as 0.075 sec, but this is not limited to this, and the interval may be shorter or longer than 0.075 sec, and may be determined according to the acquired mechanical physical quantity. As another index representing the amount of spikes, for example, kurtosis calculated from a histogram of the waveform signal in the relevant section may be used. Also, as long as it represents the characteristics of the spikes, it is not limited to this.

[0021] The correlation between the average and standard deviation calculated from the mechanical physical quantity at each predetermined time will be described with reference to FIG. Figure 5(1) shows the correlation between the average and standard deviation when the specified agent applied is Sample 1, Figure 5(2) shows the correlation between the specified agent applied is Sample 2, Figure 5(3) shows the correlation between the specified agent applied is Sample 3, and Figure 5(4) shows the correlation between the average and standard deviation when the specified agent applied is Sample 4. The horizontal axis of each graph is the average, the vertical axis is the standard deviation, and the dotted line is the mean regression line. The coordinate points of each graph are the average and standard deviation calculated at the specified intervals shown in Figure 3. In each sample, the slope is close to that of the mean regression line, and the coefficient of determination is also high in each case, so it can be said that there is a high correlation between the average and standard deviation calculated at the specified intervals.

[0022] Next, a method of calculating a feature amount using coordinate points consisting of the average and standard deviation shown in FIG. 5 and the calculated spike signal amount will be described. FIG. 6 is a diagram showing the correlation between the average and standard deviation when the applied agent is Sample 1, similar to FIG. 5(1). The distance from the origin in FIG. 6 to a coordinate point consisting of the average and standard deviation is calculated. In FIG. 6, "this distance" is shown for one coordinate, but the distance from the origin to the coordinate point consisting of the average and standard deviation is calculated in the same manner for other coordinates. In this embodiment, the distance from the origin to the coordinate point consisting of the average and standard deviation is referred to as "distance from origin" or "x' value."

[0023] FIG. 7 shows a coordinate system (horizontal axis: x' value, vertical axis: y' value) created based on the x' value and y' value. FIG. 7 illustrates an example of a rinsing state in which finger 20 is repeatedly moved while running water over the skin of the arm to which detergent 40 as shown in FIG. 1(2) has been applied. Since the x' value (distance from the origin) is the magnitude of vibration in a specified period, if the x' value is smaller than a specified range, the vibration when the moving body is moved is smaller than that of bare skin (state where the specified agent is not applied), and if it is larger than the specified range, the vibration when the moving body is moved is larger than that of bare skin (state where the specified agent is not applied). Also, if the y' value (spike amount) is smaller than a specified range, the moving body slides up when moved compared to bare skin (state where the specified agent is not applied), and if it is larger than the specified range, the moving body does not slide up compared to bare skin (state where the specified agent is not applied). When the x' value and y' value are plotted in such a coordinate system, the upper right of the coordinate system indicates a tighter tactile sensation in the rinsing state, and the lower left of the coordinate system indicates a slimier tactile sensation in the rinsing state. In other words, the upper right of the coordinate system indicates a rinsing sensation that gives a strong feeling of washing, the lower left indicates a mild rinsing sensation with a slimy feeling, and the center of the coordinate system indicates a rinsing sensation close to that of bare skin. When plotting the x' and y' values ​​in the coordinate system shown in Figure 7, the size of the plot is changed according to the y' value. In other words, the plot makes it possible to grasp the "magnitude of vibration," "amount of spikes," and "non-uniformity of vibration." The subjective evaluation of the given agent (cleaning agent 40) used in FIG. 7 is as follows. Sample 1: Moderate creaking Sample 2: There is a null in the first half Sample 3: Strong creaking Sample 4: Large tactile change

[0024] The results of applying these agents are shown in Figures 8 to 10. The following can be seen from Figures 8 to 10. The first period (Figure 8(1)) is the stage where the detergent is being poured out, and the surface generally feels smooth to the touch. In the fourth period (Figure 8(2)), when all the detergent had been removed, Samples 3 and 4 had a “squeezing” sound. In the fifth period (Figure 9(1)), the “kyuu” sound becomes stronger except for Sample 2. In the seventh period (Fig. 9(2)), the degree of “tightness” becomes similar to that of bare skin except for Sample 3. During the 9th period (Figure 10), Sample 4 felt smoother than bare skin. In this way, by using highly correlated features, namely the x' value (distance from the origin), the y' value (standard deviation), and the y'' value (amount of spikes), it is possible to grasp the change in the feel of each agent over time during rinsing.

[0025] FIG. 11 shows the characteristics of the rinsing state of each agent shown in FIGS. Sample 1 (Figure 11(1)): The feeling is somewhat tight from the first half to the middle of the rinse, and the feeling of tightness decreases in the second half of the rinse, settling at a medium level (a feeling of rinsing bare skin). Sample 2 (Fig. 11(2)): The vibration intensity is small and the duration of the vibration during rinsing is short, so the rinsing sensation is slimy. Sample 3 (Figure 11(3)): The tight feeling lasts, giving a feeling of cleansing and washing. Sample 4 (Figure 11(4)): The vehicle moves back and forth between the slippery zone and the tight zone. In addition, during the rinsing stage, in addition to the "squeak" sensation, you can also feel a "creaking" sensation depending on the magnitude of the vibration.

[0026] Here, the "creaky" sensation will be explained. As described above, the creaky sensation refers to the sensation of rubbing while catching. Using the coordinate system shown in FIG. 7, the "creaky" sensation is defined as follows. Creaking is a state in which the vibration is strong, there is no upward slippage, and the vibration is non-uniform. The reason why the state of non-uniform vibration is included is because the unevenness of the vibration causes an uncomfortable sensation to the touch, and this discomfort becomes the creaky sensation. The tactile sensation opposite to the creaky sensation is the "slip" sensation. As described above, the slippage sensation refers to the sensation of little catching and the finger slipping easily. Using the coordinate system shown in FIG. 7, the "slip" sensation is defined as follows. Slippage is a state in which the upward slippage is strong, the vibration is weak, and the vibration pattern is uniform. The reason why the state of uniform vibration is included is because the uniformity of the vibration causes no uncomfortable sensation to the touch. Therefore, when the plots shown in Figs. 8 to 10 are located in the upper right corner and are large, it can be said that a strong creaking sensation is felt. As shown in Figures 8 to 10, the change in position of each agent over time plotted in the coordinate system shown in Figure 7 differs depending on the agent, but all move on a straight line. This shows that there is also a high correlation between the x' value (distance from the origin) and the y'' value (spike amount). As such, it can be said that there is a high correlation between the x' value (distance from the origin), y' value (standard deviation), and y'' value (spike amount), and therefore it is possible to display them on a time variation graph with the x' value (distance from the origin) as the representative index.

[0027] A time variation graph representing the x' value (distance from the origin) will be described with reference to FIG. As shown in Figure 12(1), the x value (intensity average) and the y value (standard deviation) are highly correlated, and the x value (distance from the origin), y value (standard deviation), and y value (spike amount) calculated from the x value (intensity average) and y value (standard deviation) are also highly correlated, so by compressing this multidimensional data into one dimension, it is possible to express it as the time dependence of the x value (distance from the origin). Figure 12(2) shows the changes in the mechanical physical quantities of the rinsing state of each agent shown in Figures 8 to 10 as a function of time. From FIG. 12(2), for example, in the case of Sample 1, it can be seen that the time shifts before and after the bare skin zone, and finally stabilizes in the bare skin zone.

[0028] <Evaluation of the texture during the period including the first and second stages> Next, the evaluation of the tactile sensation when the moving body (finger 20) is repeatedly moved in contact with an object (skin of the arm) to which a specific agent has been applied over the first stage (during washing) and the second stage (during rinsing) will be described. In this embodiment, the state of FIG. 1(1) is the first stage, and the state of FIG. 1(2) is the second stage. In addition, five types of agents are applied in this embodiment: Sample A, Sample B, Sample C, Sample D, and Sample E. As described above, a plurality of types of feature values ​​are calculated, and a graph showing the change in the mechanical physical quantity shown in FIG. 12(2) as a function of time is created. FIG. 13(1) is a graph of the first stage (during washing), and FIG. 13(2) is a graph of the second stage (during rinsing). For example, from FIG. 13(1), it can be seen that when washing Sample D, there is no creaking at the beginning, and the creaking increases as time passes. Here, from the graph of Fig. 13, the horizontal axis can be interpreted as the perceptual meaning of the physical property being different depending on the time period. In other words, the weight of the perceptual meaning can be interpreted as being different. Also, the vertical axis can be interpreted as corresponding to the physical property if the distance from the origin is regarded as a feature related to the source signal intensity that produces the feature. In this embodiment, taking this into consideration, the tactile sensation is evaluated for a period including the first stage and the second stage.

[0029] Here, a method for determining the first tactile value and the second tactile value will be described. As described above, in this embodiment, the evaluation is performed taking into consideration that the perceptual meaning of the physical property varies depending on the time of day, and therefore, the first tactile value and the second tactile value are determined taking this into consideration. Fig. 14(1) is a graph of the second stage (rinsing) shown in Fig. 13(2). As shown in Fig. 14(2) of this graph, the vibration amount at a predetermined time is quantified. In this embodiment, the vibration amount is quantified by finding the area at the predetermined time (corresponding to the trapezoid part marked with 1 in Fig. 14(2)). As shown in Fig. 15(2), in this embodiment, the vibration amount is quantified for each period from 1 to 6. Note that, although this embodiment uses periods from 1 to 6, the period is not limited to this, and may be more or less than 6. Fig. 16 shows a method of applying a time weighting factor (sometimes referred to as a "time perception weighting factor") and a perceptual intensity factor to a quantified value (calculated area). As shown in Fig. 16(2), a predetermined time weighting factor (g1 to g6) and a perceptual intensity factor are respectively added to the areas S1 to S6 calculated for each predetermined period, to calculate S1' to S6'.

[0030] Here, the time weighting coefficients and the perceptual intensity coefficients will be explained. In the present embodiment, when the mechanical physical quantity is acquired during the repeated movement of the finger 20 and the tactile sensation is evaluated, the degree of influence of the same physical quantity on the tactile sensation differs between immediately after the start of the movement and at the end of the movement. For example, even if the sum of S1 to S6 obtained in FIG. 16(2) is the same, a person will feel differently when the numerical value of S1 is large and when the numerical value of S6 is large. Therefore, by performing a process of adding a time weighting coefficient according to the timing of acquiring the mechanical physical quantity, it becomes possible to specify a tactile sensation value close to the tactile sensation actually felt by a person. In this embodiment, as shown in FIG. 16(2), S1 is multiplied by g1=1, S2 by g2=2, . . . , and S6 by g6=6. In other words, a time weighting coefficient that gradually increases with the passage of time is multiplied. Next, we will explain the perceived intensity coefficient. The relationship between the magnitude of a mechanical physical quantity (the magnitude of a stimulus) and the strength with which it is perceived is expressed, for example, by Stevens' power law shown in the following equation (1). R = kS n ...Equation (1) In formula (1), S is the intensity of the stimulus given to a person, and R is the amount of sensation or perception that a person feels through their sense of touch in response to the stimulus intensity S (k is a constant, and n is an exponent determined for each sense). In this way, it is known that even if the intensity of the stimulus given is doubled, the amount of sensation or perception felt by a person does not double, but is proportional to the power of the exponent n. Therefore, in this embodiment, as shown in FIG. 16(2), an exponent n=1 / 3 is added to the determined S1 to S6 to determine a tactile value that is close to the tactile sensation that a person actually feels. Then, as shown in formula (2), the difference between the sum of S1' to S6' calculated in this manner and the reference amount Ss' is used as the tactile value. Index=ΣSi´-ΣSs´...Equation (2) In formula (2), ΣSi' is the sum of the calculated S1' to S6', and ΣSs' is the reference amount. The reference amount is the sum of values ​​calculated in advance from a comparative agent (a reference agent for comparison) to the specific agent for which the first tactile value and the second tactile value are obtained, the area at a specific time obtained when quantifying the vibration amount is subjected to additional processing of a time weighting coefficient and a perceived intensity coefficient. In this way, the mechanical physical quantity in the first stage is used to determine the first tactile value, and the mechanical physical quantity in the second stage is used to determine the second tactile value. In addition, a predetermined time weighting value (e.g., g1 to g6) is added to a plurality of feature quantities for each predetermined period (e.g., average, standard deviation, spike amount, distance from the origin, and magnitude of mechanical physical quantities calculated from these) according to the time zone of the predetermined period, and the first tactile value and the second tactile value are determined using the feature quantities that have been subjected to the time weighting addition process. Then, by using the tactile values ​​calculated in this way for evaluation, it is possible to perform an evaluation that is close to the tactile sensation that a person actually feels.

[0031] 17 is a graph in which tactile values ​​are specified for each stage and each sample by the above-mentioned method, and the specified tactile values ​​are plotted in a coordinate system in which the horizontal axis indicates the first stage (during washing) and the vertical axis indicates the second stage (during rinsing). That is, by plotting both the first tactile value and the second tactile value in a coordinate system including a first axis (e.g., the horizontal axis) indicating the first tactile value and a second axis (e.g., the vertical axis) indicating the second tactile value, it is possible to evaluate the tactile sensation during a period including the first stage (e.g., during washing) and the second stage (e.g., during rinsing). For example, the following can be said from FIG. Sample A was in a squeaky state during both the first stage (washing) and the second stage (rinsing), meaning that it always felt tight to the touch. Sample B is a little squeaky during the first stage (when washing), but feels almost like bare skin during the second stage (when rinsing). Sample C has almost no squeaking during the first stage (washing) and feels almost like bare skin during the second stage (rinsing). Sample D had almost no squeaking during both the first stage (washing) and the second stage (rinsing), and had an overall slimy feel. Sample E does not squeak during the first stage (when washing), but has a slightly squeaky, tight texture during the second stage (when rinsing). In this way, the first tactile value of the first stage and the second tactile value of the second stage can be used to evaluate the tactile sensation of a period including the first stage and the second stage, making it possible to perform an overall tactile evaluation when multiple stages are included.

[0032] The process flow of the above-mentioned evaluation method is shown in FIG. The step (step S100) is a step of acquiring time series data of mechanical physical quantities. The acquisition method is as described above. The step (step S110) is a step of determining multiple types of feature quantities from the acquired time-series data of mechanical physical quantities. The method of calculating each feature quantity is as described above. In this embodiment, the average signal strength (x value), standard deviation of signal strength (y' value), spike amount (y'' value), and distance from the origin (x' value) are calculated for each predetermined period (e.g., every 2 seconds). The step (step S120) is a step of identifying a first tactile value in the first stage and a second tactile value in the second stage using the calculated multiple types of feature quantities. The method of identifying each tactile value is as described above. In this embodiment, the first tactile value and the second tactile value are identified by adding a time weighting coefficient and a perceived intensity coefficient. In the step (step S130), the tactile sensation during the period including the first stage and the second stage or the physical properties that produce the tactile sensation are evaluated using the identified first tactile value and second tactile value. The evaluation method is as described above. In this embodiment, the first tactile value and the second tactile value are plotted in the coordinate system shown in FIG. 17 and evaluated.

[0033] <Tactile evaluation device> The tactile evaluation device 200 will be described with reference to FIG. The tactile evaluation device 200 in this embodiment is composed of a moving body 110, an acquisition unit 120, a calculation unit 130, a determination unit 140, and an evaluation unit 150. The device also includes an information processing terminal 100 capable of executing various processes, and the information processing terminal 100 includes the calculation unit 130, the determination unit 140, and the evaluation unit 150. The information processing terminal 100 is a general-purpose personal computer, and includes input devices such as a keyboard and a pointing device, an arithmetic processing unit (e.g., a CPU (Central Processing Unit), an MPU (Micro Processing Unit), etc.), a storage unit, etc. The information processing terminal 100 also preferably includes a display unit 160 (display device), but the display unit 160 may be provided outside the information processing terminal 100 and connected via a network.

[0034] The moving object 110 is a finger 20, a palm, or a measurement tool that is brought into contact with the surface of the skin. The acquiring unit 120 is a means (corresponding to an acquiring means) for acquiring, over time, a mechanical physical quantity generated by moving the finger 20, using the sensor 30 attached to the finger 20 shown in Fig. 1. The mechanical physical quantity (electrical signal) acquired by the sensor 30 is configured so that it can be acquired by the information processing terminal 100 via a network line, a medium, etc. The calculation unit 130 is a means (corresponding to a calculation means) for calculating a plurality of types of feature quantities from the time-series data of the mechanical physical quantities acquired by the acquisition unit 120. The calculation method is the same as that described above. The determination unit 140 is a means (corresponding to a determination means) for determining the first tactile value and the second tactile value using the calculated multiple types of feature amounts. The determination method is the same as that described above. The evaluation unit 150 is a means (corresponding to an evaluation means) for evaluating the tactile sensation during a period including the first stage and the second stage or the physical properties that produce the tactile sensation, using the first tactile value and the second tactile value identified by the identification unit 140. The evaluation content is the same as that described above. It is preferable that the evaluation result by the evaluation unit 150 is displayed on the display unit 160 so that the evaluator can easily grasp it. The display unit 160 displays the evaluation results by the evaluation unit 150, for example, the graph shown in Fig. 17. In addition, by displaying the graphs shown in Figs. 11 and 13, for example, it becomes possible to evaluate the tactile sensation of each agent during each period of washing or rinsing. The memory unit of the information processing terminal 100 stores a program for executing the evaluation method described above, in which the program acquires the mechanical physical quantities acquired by the acquisition unit 120, causes the calculation unit 130 to calculate multiple types of feature quantities from the acquired mechanical physical quantities, causes the identification unit 140 to identify a first tactile value and a second tactile value, and causes the evaluation unit 150 to display the evaluation result on the display unit 160.

[0035] As described above, the present invention has been described by showing specific embodiments, but the present invention is not limited to the above-described embodiments and also includes various modifications, improvements, and other aspects as long as the object of the present invention is achieved. <Modification> In this embodiment, the time weighting coefficient and the perceived intensity coefficient are added when determining the first tactile value and the second tactile value, but the time weighting coefficient and the perceived intensity coefficient do not have to be added. That is, the first tactile value and the second tactile value may be determined using the areas S1 to S6 calculated for each predetermined period shown in Figure 16 (2). Using the first tactile value and the second tactile value determined in this way also makes it possible to evaluate the tactile sensation for the period including the first stage and the second stage.

[0036] In addition, in this embodiment, a time weighting coefficient that increases linearly with time is used, but this is not limited to this. For example, a time weighting coefficient that increases quadratically may be used. Since the end of a motion has a particularly high contribution to a person's sensation, if a time weighting coefficient that increases quadratically is used, the mechanical physical quantity at the end of the motion can be evaluated more heavily, making it possible to perform an evaluation that is closer to the tactile sensation that a person actually feels.

[0037] In addition, in this embodiment, the gradual increase rate of the time weighting coefficient in the first stage and the gradual increase rate of the time weighting coefficient in the second stage are set to be the same, but this is not limited to the above, and the gradual increase rate of the time weighting coefficient in the first stage and the gradual increase rate of the time weighting coefficient in the second stage may be set to different values.

[0038] In addition, in this embodiment, the time weighting coefficient in the first stage and the time weighting coefficient in the second stage are increased with time, but this is not limited to this. For example, since stimuli at the start and end of a motion have a high impact on a person, the coefficients may be gradually increased within a predetermined range from the initial value, and then may not be increased or decreased for a while, and then may be gradually increased. Specifically, for example, g1=1, g2=2, g3=3, g4=3, g5=3, and g6=4 may be used. In this way, when there is an impactful stimulus at the start and end of a motion, it is possible to perform an evaluation close to the tactile sensation that a person actually feels.

[0039] Furthermore, in this embodiment, the first tactile value is a time weighting coefficient in the first stage (e.g., gradually increasing from g1 (=1) to g6 (=6)), and the second tactile value is a time weighting coefficient in the second stage (e.g., gradually increasing from g1 (=1) to g6 (=6)), so the time weighting coefficient when determining the second tactile value is a value associated with the time weighting coefficient of the first stage. The "value associated with the time weighting coefficient of the first stage" means, as in this embodiment, aspect 1) the time weighting coefficient g1 (=1) of the second stage is set to the same time weighting coefficient as the time weighting coefficient g1 (=1) of the first stage, i.e., the initial value (g1) of the time weighting coefficient of the second stage is set to the same as the time weighting coefficient of the first stage and gradually increases at the same rate; aspect 2) the time weighting coefficient g1 of the second stage is set to a time weighting coefficient (e.g., 0.5) smaller than the time weighting coefficient g1 (=1) of the first stage, i.e., the initial value of the time weighting coefficient of the second stage is smaller than the initial value of the time weighting coefficient of the first stage; aspect 3) the time weighting coefficient g1 of the second stage is set to a time weighting coefficient (e.g., g5) before the end of the time weighting coefficient of the first stage. (=5)), i.e., the initial value of the time weighting coefficient of the second stage is the same as the time weighting coefficient before the final value of the time weighting coefficient of the first stage; aspect 4) g1 of the time weighting coefficient of the second stage is a time weighting coefficient (e.g., 5.5) smaller than the final time weighting coefficient (g6 (=6)) of the time weighting coefficient of the first stage, i.e., the initial value of the time weighting coefficient of the second stage is smaller than the final value of the time weighting coefficient of the first stage; aspect 5) g1 of the time weighting coefficient of the second stage is a time weighting coefficient (e.g., 7) greater than or equal to the final time weighting coefficient (g6 (=6)) of the time weighting coefficient of the first stage, i.e., the initial value of the time weighting coefficient of the second stage is greater than the final value of the time weighting coefficient of the first stage. As in aspects 1) to 4), the reason why g1, the time weighting coefficient for the second stage, is a time weighting coefficient smaller than the final time weighting coefficient (g6 (=6)) of the first stage is that the specified agents are different between the first and second stages, the environments of the objects to which the specified agents are applied are different, or the objects are different, and therefore the tactile impression is reset when the second stage is reached. In this way, by specifying the first tactile value and the second tactile value using a value of g1, the time weighting coefficient for the second stage, smaller than the final time weighting coefficient (g6 (=6)) of the time weighting coefficients for the first stage, it is possible to perform an evaluation that is closer to the tactile sensation that a person actually feels. Furthermore, as in aspect 3), when the time weighting coefficient g1 of the second stage is set to a time weighting coefficient before the end of the time weighting coefficient of the first stage (for example, g5 (=5)), there is a high possibility that the tactile impression will not be completely reset when changing from the first stage to the second stage, for example, if the first stage and the second stage are both in a rinsing state, and the first stage is rinsed with water (lower than the surface temperature of the skin) and the second stage is rinsed with lukewarm water. In addition, as in aspect 5), the time weighting coefficient g1 of the second stage is set to a time weighting coefficient (e.g., 7) equal to or greater than the final time weighting coefficient of the first stage (g6 (=6)). For example, when the first and second stages are both in a massage state and the specified agent applied in the first and second stages is different (e.g., oil in the first stage and cream in the second stage), in order to continue the tactile impression of the first stage, the first tactile value and the second tactile value are identified using a time weighting coefficient (e.g., 7) equal to or greater than the final time weighting coefficient of the first stage (g6 (=6)). This makes it possible to perform an evaluation that is closer to the tactile sensation that a person actually feels. In this way, depending on the contents of the first and second stages, it is preferable that the predetermined time weighting value of the second stage is a value related to the predetermined time weighting value of the first stage.

[0040] In this embodiment, the first tactile value and the second tactile value are determined by adding a time weighting coefficient and a perceived intensity coefficient to the areas S1 to S6 calculated for each predetermined period shown in FIG. 16(2), but this is not limited to the above. For example, the first tactile value and the second tactile value may be determined without including some values. In addition, the areas obtained in a certain period and the previous period in a certain stage may be compared, and the area value of the period may be biased according to the difference or ratio. For example, if the area in the previous period is smaller than the area in the certain period, the area in the certain period may be multiplied by the ratio to the area in the previous period to determine the first tactile value and the second tactile value.

[0041] In this embodiment, when determining the first tactile value and the second tactile value, the vibration amount at a predetermined time is quantified by finding the area at the predetermined time (corresponding to the trapezoid part marked with 1 in FIG. 14(2)) as shown in FIG. 14(2), but this is not limited to this. For example, the values ​​may be determined using appropriate basis functions such as the rectangular basis function for each predetermined time in the graph shown in FIG. 14(1), or a rectangle, sine, cosine, etc.

[0042] In this embodiment, the first stage and the second stage are continuous, but this is not limited to the above. For example, the second stage may occur after a predetermined period of time has passed after the first stage. Since the first tactile value and the second tactile value are measured for each stage, a series of tactile evaluations can be performed for a period including the first stage and the second stage, even if the second stage occurs after a predetermined period of time has passed after the first stage.

[0043] In this embodiment, the evaluation was performed for the period including the first stage and the second stage, but the number of stages is not limited to this. For example, the state in which a makeup remover is applied as a specific agent is the first stage, the state in which a face wash is applied is the second stage, and the state in which a lotion is applied is the third stage, and it is also possible to evaluate the tactile sensation during the period including the first stage, the second stage, and the third stage. In this case, for example, the first tactile sensation value, the second tactile sensation value, and the third tactile sensation value can be plotted on a three-axis coordinate system to visually grasp the overall characteristics consisting of the characteristics of the three stages, and the tactile sensation or the physical properties that produce the tactile sensation can be evaluated. That is, by plotting each tactile sensation value (e.g., the first tactile sensation value, the second tactile sensation value, and the third tactile sensation value) specified for each of the multiple stages (e.g., the first stage, the second stage, and the third stage) that a specific stage has on a specific coordinate system (e.g., the three-axis coordinate system), it is possible to evaluate the tactile sensation during the period including the multiple stages or the physical properties that produce the tactile sensation.

[0044] In this embodiment, the predetermined threshold for determining a "spike" may be a predetermined percentage of the signal strength of the acquired signal waveform (for example, a predetermined percentage of the maximum signal strength). [Explanation of symbols]

[0045] 10 Arithmetic unit 20 fingers 30 Sensors 40 Cleaning Agent 100 Information processing terminal 110 Actions 120 Acquisition Department 130 Calculation section 140 Specific section 150 Evaluation Department 160 Display section 200 Tactile evaluation device

Claims

1. a moving body that is in contact with an object to which one or more predetermined agents have been applied is moved, and time-series data of mechanical physical quantities occurring between the object and the moving body is acquired; a method for evaluating the tactile feel of the object or physical properties that produce the tactile feel, the method comprising: calculating a plurality of types of feature quantities for each predetermined period of a predetermined stage from the acquired time-series data of mechanical physical quantities; and evaluating the tactile feel of the object or physical properties that produce the tactile feel based on the plurality of types of feature quantities, the method comprising: the predetermined stage has at least a first stage and a second stage which are different in time period, and the operating body which has been brought into contact with the object is operated in the first stage and the second stage to acquire the time series data; The first stage and the second stage are The predetermined agents are different from each other; The environments of the objects to which the predetermined agent is applied are different from each other, or the objects are different from one another; At least one of the following is true: identifying a first tactile value in the first stage and a second tactile value in the second stage using the plurality of types of feature amounts calculated for each predetermined period; An evaluation method for evaluating the tactile sensation or the physical properties that produce the tactile sensation during a period including the first stage and the second stage in which the moving body is brought into contact with the object, based on the first tactile value and the second tactile value.

2. 2. The evaluation method according to claim 1, wherein the time series data of the mechanical physical quantity is data generated between the object and the moving body by repeatedly moving the moving body in contact with the object.

3. 3. The evaluation method according to claim 1, wherein the plurality of types of feature quantities include at least one of the mechanical physical quantity, a statistic of the mechanical physical quantity, a spike signal quantity that is a value equal to or greater than a predetermined threshold of the mechanical physical quantity or the statistic of the mechanical physical quantity, and a feature quantity calculated from an average value or a variation that is a statistic of the mechanical physical quantity.

4. determining the first tactile value using the mechanical physical quantity in the first stage; The evaluation method according to claim 1 or 2, wherein the second tactile value is determined using the mechanical physical quantity in the second stage.

5. The evaluation method according to claim 1 or 2, characterized in that the tactile sensation or the physical properties of a predetermined agent over a period including multiple stages is evaluated by plotting each tactile sensation value specified for each of the multiple stages included in the predetermined stage on a predetermined coordinate system.

6. the coordinate system comprises a first axis representing the first tactile value and a second axis representing the second tactile value; The evaluation method according to claim 5, wherein the tactile sensation or the physical properties that produce the tactile sensation during a period that includes the first stage period and the second stage period are evaluated by plotting both the first tactile value and the second tactile value on the coordinate system.

7. 3. The evaluation method according to claim 1, wherein a predetermined time weighting value is added to the plurality of types of feature quantities for each predetermined period according to a time zone of the predetermined period, and the first tactile value and the second tactile value are identified using the feature quantities to which the time weighting has been added.

8. the first stage is followed by the second stage; 8. The evaluation method of claim 7, wherein the predetermined time weighting value of the second stage is a value associated with the predetermined time weighting value of the first stage.

9. an acquisition means for acquiring time series data of mechanical physical quantities occurring between an object to which one or more predetermined agents have been applied and the object by operating a moving body; a calculation means for calculating a plurality of types of feature quantities for each predetermined period of a predetermined stage from the time series data of the acquired mechanical physical quantities; and evaluation means for evaluating the tactile feel of the object or a physical property that produces the tactile feel based on the plurality of types of feature quantities, the predetermined stage has at least a first stage and a second stage which are different in time period, and the operating body which has been brought into contact with the object is operated in the first stage and the second stage to acquire the time series data; The first stage and the second stage are The predetermined agents are different from each other; The environments of the objects to which the predetermined agent is applied are different from each other, or the objects are different from one another; At least one of the following is true: further comprising an identification means for identifying a first tactile value in the first stage and a second tactile value in the second stage using the plurality of types of feature amounts calculated for each predetermined period, The evaluation means An evaluation device that evaluates the tactile sensation or the physical properties that produce the tactile sensation during a period including the first stage and the second stage in which the moving body is brought into contact with the object, based on the first tactile value and the second tactile value.

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