JP2005127717A - Tactual sense meter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To quantitatively evaluate the rapidity of fitness of a cosmetic base and a tactual sense on an article. <P>SOLUTION: A first elastic member 2 distorted by load and a second elastic member 4 distorted by friction force are provided between a base table 1 and a holding table 5 for holding, on a surface thereof, an object under evaluation such as an artificial skin coated with the cosmetic base, with the members used to simultaneously detect friction force in an x direction and load in a z direction, these being generated when the object under evaluation is rubbed. A strain gage 6z is provided for the first elastic member 2 while a strain gage 6x is provided for the second elastic member. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a tactile meter for quantitatively evaluating the familiarity of a cosmetic base applied to the skin and the tactile sensation of an article.

  When applying cosmetics such as creams and emulsions to the skin, the speed with which the cosmetic base adapts to the skin and the touch when touching articles such as carpets and seats are important in determining the quality of the use. Since it is an element, various evaluations regarding the speed of familiarity of cosmetic bases and the tactile sensation of articles have been conventionally performed.

  Here, let us consider the evaluation of “fastness of familiarity” of a cosmetic base.

  As described above, “fastness of familiarity” means how fast the cosmetic base adapts to the skin, but more specifically, after the user starts applying the base to the skin, Based on the length of time it takes for the base material to become familiar to the skin and stop applying, triggered by the feeling that the agent can no longer be felt and the finger stops (finger stop feeling) It is one of the indices representing the characteristics of cosmetic bases.

  For cosmetic bases, the required speed of familiarity varies depending on the application.For example, in the case of a cream for massage, it is better that the base lasts for a long time. On the other hand, in the case of a cosmetic preparation containing a medicine, it is better to enhance the absorption of the base into the skin, so it is desirable that the familiarity is quicker. For this reason, evaluation of the speed of familiarity of the cosmetic base is carried out in order to realize a suitable speed of familiarity according to the use of the cosmetic base.

  As a method for evaluating the speed of familiarity, sensory evaluation is generally used in which a cosmetic base that is an object of evaluation by a tester is actually used on the skin, and a person evaluates the speed of familiarity. .

  However, the above-described method for evaluation by the person has a problem in that the subjective feeling of the tester is the standard, so that the objectivity and reproducibility for the evaluation are poor and the evaluation results vary. In order to eliminate this problem, it is necessary to quantitatively evaluate the speed of familiarity.

  As described above, when applying a cosmetic base, a person gets a feeling of finger stoppage, i.e., the frictional force between the hand or finger applying the base and the skin gradually increases, and a predetermined threshold is set. When it exceeds, it feels that the base has become familiar with the skin and moves to stop applying the base.

  Therefore, as a method for quantitatively evaluating the speed of familiarity, a method of evaluating the speed of familiarity in association with the temporal change in frictional force generated when the base is applied under a predetermined condition can be considered. Actually, it is difficult to evaluate the speed of familiarity only by the change of the frictional force.

  FIG. 2 is an example of the results of an experiment conducted by the present applicant, and shows the temporal change in frictional force when a simulated application action is performed on a plurality of emulsion samples whose familiarity is known. It is a representation.

  Note that a surface property measuring machine is used for measuring the frictional force. As shown in FIG. 1, the measuring method is such that an emulsion sample 83 is placed on an artificial skin 82 fixed to a table 81, and a stress sensor 85 is placed thereon. The table 81 was reciprocated at a constant speed while a constant load Fg was applied with the weight 84 attached thereto, and the absolute value of the stress sensed by the stress sensor 85 was detected as a frictional force. The frictional force was sampled at about 100 Hz, and the maximum value of the data sampled every 1 second or 10 seconds was taken. As the artificial skin 82, a supplera (protein powder-dispersed polyurethane) having both hydrophilicity and hydrophobicity on the surface as in the actual skin and having a surface shape similar to the unevenness of the skin was used.

  FIG. 2 (1) shows the measurement results when the load = 20 gf and the reciprocating speed = 50 mm / s, and FIG. 2 (2) shows the measurement results when the load = 300 gf and the reciprocating speed = 10 mm / s. The speed of familiarity of each latex sample has a relationship of S6 (slow) <S15, S11 <S18, S8 (fast) (S means an abbreviation of the sample).

  2 (1) and 2 (2), the order of familiarity does not correspond to the order of magnitude of friction force, and the frictional conditions are different in FIGS. 2 (1) and 2 (2) where the measurement conditions are different. In some cases, the magnitude of the force is reversed (for example, S6 and S18), and it has been found that there is no correlation between the speed of familiarity and the frictional force. Further, no correlation is found in the curve shape of the temporal change of the frictional force.

  It should be noted that such a situation can be considered to be similar in the evaluation of the tactile sensation of an article that requires an operation similar to the operation of a hand or a finger when obtaining a feeling that the cosmetic base is familiar with. Under the present circumstances, it is difficult to quantitatively evaluate the familiarity of the cosmetic base and the feel of the article.

  In view of the above circumstances, an object of the present invention is to provide a tactile meter that can quantitatively evaluate the familiarity of a cosmetic base and the tactile sensation of an article.

  Applicants believe that when a person applies cosmetics such as creams and emulsions to the skin and feels that the cosmetics are familiar, or when a person rubs the article to obtain a tactile sensation, Occurs due to this behavior, based on the results of experiments conducted on its own, assuming that it is a movement that feels the frictional force generated while applying a load (pressing force in the vertical direction) to the skin or article. By measuring the physical quantity to be measured, that is, the load and frictional force on the skin and the article at the same time and observing the magnitude and temporal change of these physical quantities, it is possible to quantitatively evaluate the “fastness of familiarity” and the tactile sensation of the article. I found out.

  The contents will be described below.

  FIG. 4 is an example of experimental results conducted by the present applicant, and friction when a simulated application action using a finger is performed on two different cream samples, a polymer emulsified cream and a nonionic active agent cream. It shows the time change of force and load.

  In this experiment, as shown in FIG. 3, the sample 83 is placed on the artificial skin 82, and the sample 83 is rubbed with a finger and then reciprocated along one direction d. This is to measure temporal changes in the frictional force Fx and the load Fz when the application is performed.

  When FIG. 4 is seen, similarity is seen about the temporal change of a load, but the similarity is not seen about the temporal change of a load between the two said creams. In other words, the time-dependent change in the frictional force draws a change curve that falls after a rapid rise after a predetermined time in any cream, but the time-dependent change in the load is the frictional force in the polymer emulsion cream. On the other hand, the nonionic active agent cream draws a gradually decreasing change curve. That is, it can be seen that when applying a cosmetic base, a person changes how to apply a load depending on the type of the base.

  Therefore, it is presumed that not only the frictional force but also the load must be considered in order to quantitatively evaluate the familiarity of the cosmetic base and the tactile sensation of the article.

  FIG. 5 and FIG. 6 are examples of experimental results conducted by the present applicant, and the load when a simulated application action with a finger is performed on a plurality of cosmetic base samples whose familiarity is known. It shows the change over time of the frictional force.

  The order of familiarity is S14 (slow) <S11 <S13 (fast), and S11 is considered as a reference product, S14 is a familiar sample, and S13 is a familiar sample.

  As can be seen from these diagrams, the slope of the gradient of the temporal change in load and friction force becomes steeper as the speed of familiarity increases, especially in the case of fast-familiar samples, which tends to increase rapidly in the latter half. It is done. In addition, although the experiment was repeated twice, no significant difference was observed in the time change between the first measurement and the second measurement, and it was recognized that there was reproducibility.

  From this experimental result, the friction force and load generated when applying cosmetics or rubbing the article are measured at the same time, and the time change (for example, the slope of the inclination) is observed, so It has been found that a quantitative evaluation of tactile sensation is possible.

  Therefore, the present invention makes it possible to quantitatively evaluate the familiarity of the cosmetic base and the tactile sensation of the article, and the physical quantity generated by rubbing the evaluation object, that is, the load applied by the person to the evaluation object An object of the present invention is to provide a tactile meter that can simultaneously measure the frictional force along the surface of the evaluation object.

  The tactile meter of the present invention includes a holding table for holding the evaluation object on the surface, a frictional force generated when the surface of the evaluation object is rubbed along a first direction parallel to the surface of the holding table, and the evaluation object Detecting means capable of independently detecting a load in the second direction perpendicular to the surface of the holding table generated when rubbing the surface, and an output means for outputting the detected load and friction force separately. It is characterized by this.

  Evaluation targets include, for example, artificial skin coated with cosmetic bases such as creams and emulsions when evaluating the speed of familiarity, and the skin of carpets and seats when evaluating the feel of the surface. Although it can be considered, it is not limited to these, and any material may be used as long as it can be evaluated by rubbing with hands or fingers.

  In the tactile meter of the present invention, the detection means has a first elastic member having one end fixed on the base and having a portion extending substantially in the first direction, and a position away from the one end of the first elastic member. And a second elastic member having a portion extending in a substantially second direction and having the other end fixed to a holding base, and extending in a substantially first direction of the first elastic member by the load. A first strain / electrical signal converter that detects a strain generated between the one end and a position away from the one end and outputs an electrical signal corresponding to the strain, and the frictional force, A second strain-electric signal converter that detects a strain generated in a portion extending in a substantially second direction of the second elastic member and outputs an electrical signal corresponding to the strain; The elastic member 1 can be distorted by the load applied via the second elastic member. And the second elastic member may be distorted by the frictional force, and the output means is an output means of an electric signal output from the first and second strain / electrical signal converters. can do.

  In this case, the first and second strain / electrical signal converters may be strain gauges. As the strain gauge, for example, an electric resistance wire type in which the electric resistance changes in accordance with the strain is conceivable, but a mechanical, optical, capacitance type, or magnetostriction type may be used.

  Further, the first and second elastic members may be metal rod-shaped members. As a metal rod-shaped member, for example, aluminum or iron can be considered.

  In this case, a thin portion may be provided at an intermediate portion of the rod-shaped member, and the strain / electric signal converter may be attached to the thin portion.

  The position away from the one end of the first elastic member and the one end of the second elastic member may be directly fixed, or a connecting member having a portion extending substantially in the first direction. It may be fixed via.

  “Directly fixed” means a state in which the first elastic member and the second elastic member are included in one member by means of so-called shaving. The state obtained may be sufficient, and the state which fixed the 1st elastic member and the 2nd elastic member with the screw | thread, the volt | bolt nut, the adhesive agent, etc. may be sufficient.

  The “connecting member” is a member that fixes the second elastic member by shifting it in the first direction. For example, the second elastic member is substantially in the middle of the portion of the first elastic member that extends in the first direction. It is good also as what has the length and shape which are arrange | positioned.

  In the tactile meter of the present invention, a plurality of combinations including the first and second elastic members and the first and second strain / electrical signal converters are provided, and the plurality of combinations are such that the load and the frictional force are the plurality of the combinations. It may be arranged so as to be distributed in each of the combinations.

  For example, it can be considered that the combination is arranged so as to be bilaterally symmetric with respect to the holding table with the first direction as an axis. There are those arranged approximately in the middle of the direction, or those obtained by arranging the above four combinations so as to be vertically and horizontally symmetrical with respect to the holding table.

  In the tactile meter of the present invention, the first stopper that restricts the movable range in the second direction due to the load of the first elastic member, and the movable in the first direction due to the friction force of the second elastic member. You may make it further provide the 2nd stopper which restrict | limits a range.

  The tactile meter of the present invention requires at least the ability to detect a minute force such as a load or frictional force on the skin when a person applies cosmetics such as creams and emulsions to the skin. However, it is not limited to such a small force.

  The tactile meter of the present invention includes a holding table for holding the evaluation object on the surface, a frictional force generated when the surface of the evaluation object is rubbed along a first direction parallel to the surface of the holding table, and the evaluation object A detecting means capable of independently detecting a load in a second direction perpendicular to the surface of the holding table generated when the surface is rubbed; and an output means for outputting the detected load and friction force separately. Therefore, it is possible to simultaneously measure the load and friction force generated when rubbing the evaluation target, which are correlated with the speed of familiarity of the cosmetic base and the tactile sensation of the article, via the holding table. Based on the force, it becomes possible to quantitatively evaluate the familiarity of the cosmetic base and the feel of the article.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 7 is a diagram showing a configuration in an embodiment of a tactile meter according to the present invention. The tactile meter shown in FIG. 7 includes a holding base for holding the evaluation target on the surface, a frictional force generated when the surface of the evaluation target is rubbed along a first direction parallel to the surface of the holding base, and the evaluation target. A tactile sensation measuring table 10 having detection means capable of independently detecting a load in a second direction perpendicular to the surface of the holding table generated when the surface of the holding table is rubbed, and each of the detected load and friction force. It comprises a dynamic distortion amplifier BOX 20 which is an output means for outputting separately.

  FIG. 8 is a view showing a specific structure of the tactile sensation measuring table 10, wherein (1) is a front view thereof, (2) is a side view thereof, and (3) is a top view thereof. In the present embodiment, the first direction is the x axis, the second direction is the z axis, and the direction perpendicular to the x axis and the z axis is the y axis.

  The tactile sensation measuring table 10 shown in FIG. 8 includes a first elastic member 2 having one end fixed on the base 1 and a portion extending substantially in the first direction (x-axis), and the first elastic member 2. The second elastic member 4 having one end fixed at a position away from the one end and the other end fixed to the holding base 5 and having a portion extending in a substantially second direction (z-axis), and the load, 1 is a portion extending in a substantially first direction (x-axis) of one elastic member 2 and detects a strain generated between the one end and a position away from the one end, and outputs an electrical signal corresponding to the strain. A strain gauge 6z serving as a first strain / electrical signal converter, and a strain generated in a portion extending in a substantially second direction (z-axis) of the second elastic member by the friction force, and detecting the strain And a strain gauge 6x as a second strain / electrical signal converter for outputting an electrical signal according to the above. Here, the first elastic member 2 can be distorted by the load applied via the second elastic member 4, and the second elastic member can be distorted by the frictional force. .

  The holding table 5 has a fixing means (not shown) for holding the evaluation target. For example, a plate for suppressing the end of the evaluation target from above and a plate for fastening the plate to the holding table 5. There are fixing means composed of bolts.

  The first elastic member 2 and the second elastic member 4 are metal rod-shaped members having a through-hole a for providing a thin portion at an intermediate portion thereof, and the strain gauges 6x and 6z in the thin portion. Is pasted. The through hole a is for reducing the rigidity of the rod-like member and making it easy to distort. The strain gauges 6x and 6z are of an electric resistance wire type, and are of a type in which the electric resistance changes according to the strain.

  Moreover, the position away from the said one end of the 1st elastic member 2 and the said one end of the 2nd elastic member 4 are being fixed via the connection member 3 which has a part extended in a substantially 1st direction. When the first elastic member 2 and the second elastic member 4 are directly connected, if the elastic member is lengthened to try to detect a more sensitive force, the tactile sensation measurement table itself will be enlarged. By fixing via the connecting member as described above, both high-sensitivity detection of the load by the first elastic member 2 and space saving can be realized.

  The tactile sensation measuring table 10 includes two combinations of first and second elastic members 2 and 4 and strain gauges 6z and 6x attached to these elastic members. About halfway between the first direction (x-axis) of the holding table 5 so that the frictional force is distributed to each combination so as to be symmetrical with respect to the holding table 5 about the first direction (x-axis). Is arranged.

  Further, the tactile sensation measuring table 10 includes the first stopper 7z that limits the movable range of the first elastic member 2 in the second direction (z-axis) due to the load, and the friction force of the second elastic member 4. And a second stopper 7x for restricting the movable range in the first direction (x-axis) by the first and second elastic members when an external force exceeding the allowable range is applied to the holding base 5 2 and 4 are prevented from applying excessive stress.

  The dynamic strain amplifier BOX 20 reads the electrical resistance of each strain meter 6x, 6z provided in the tactile sensation measurement table 10, converts it into a voltage signal proportional to the load and frictional force, and outputs the voltage signal. A Wheatstone bridge circuit may be used to convert a minute change in electrical resistance of the strain gauge into a change in current once, and further convert this into a change in voltage for reading.

  Next, the operation of the tactile meter configured as described above will be described.

  When an evaluation object such as artificial skin coated with a cosmetic base is fixed to the holding table 5 of the tactile sensation measuring table 10, and the person rubs the evaluation object with a finger or the like in the x-axis direction, the direction of rubbing against the holding table 5 External force is applied diagonally below. The component force of the external force in the x-axis direction is applied to the end portion of the second elastic member fixed to the holding base 5, and distortion occurs in the portion of the second elastic member 4 extending in the z-axis direction, The electrical resistance of the strain gauge 6z changes according to the strain. On the other hand, the component force in the z-axis direction of the external force is applied to the free end portion of the first elastic member 2 via the second elastic member 4 and the connecting member 3, and the first elastic member 2 is in the x-axis direction. Distortion occurs in the portion extending to, and the electric resistance of the strain gauge 6x changes according to the distortion.

  The dynamic strain amplifier BOX 20 reads a change in the electrical resistance of the strain gauge 6x, and generates a voltage signal proportional to the component force in the x-axis direction corresponding to the friction force based on the change, while the electrical resistance of the strain gauge 6z. Based on this change, a voltage signal proportional to the component force in the z-axis direction corresponding to the load is generated, and these voltage signals are amplified and output separately. The voltage signal may be output to a voltmeter or the like to display a voltage value or a value converted into a unit of force such as gf on the screen of a meter or the like. The change may be recorded, or it may be output to a computer equipped with an A / D converter and recorded as digital data, and the graph and data analysis showing the time change of the load and friction force Etc. may be performed.

  Thus, the tactile meter according to the present invention includes a holding base for holding the evaluation target on the surface, and a frictional force generated when the evaluation target surface is rubbed along a first direction parallel to the surface of the holding base. , A detecting means capable of independently detecting a load in the second direction perpendicular to the surface of the holding table generated when rubbing the surface of the evaluation object, and an output means for outputting the detected load and friction force separately. Therefore, the load and frictional force generated when rubbing the evaluation object, which are correlated with the speed of familiarity of the cosmetic base and the feel of the article, can be measured simultaneously via the holding table. Based on the applied load and frictional force, it becomes possible to quantitatively evaluate the familiarity of the cosmetic base and the feel of the article.

  Note that the tactile sensation measuring table 10 may have a structure as shown in FIG. 9 or 10 in addition to the above embodiment.

  The tactile sensation measuring table shown in FIG. 9 and FIG. 10 is similar to the above embodiment, the first elastic member 2 having a portion that is fixed at one end on the base 1 and extends in substantially the first direction (x-axis). And a second elastic member having a portion extending in a substantially second direction (z-axis) having one end fixed at a position away from the one end of the first elastic member 2 and the other end fixed to the holding base 5. By detecting the distortion generated between the one end and the position away from the one end, which is a portion extending in the substantially first direction (x axis) of the first elastic member 2 by the load, A strain gauge 6z serving as a first strain / electrical signal converter that outputs an electrical signal corresponding to the strain and a portion extending in a substantially second direction (z-axis) of the second elastic member by the friction force. A strain meter 6x as a second strain / electrical signal converter that detects the generated strain and outputs an electrical signal corresponding to the strain. Which it was provided with a tactile sensation measurement table shown in FIG. 9, which has a first elastic member 2 and the second elastic members 4 directly fixed and does not use a connecting member 3. The tactile sensation measuring table shown in FIG. 10 includes four combinations of the first and second elastic members 2 and 4 and the strain gauges 6x and 6z, and the load and the frictional force are dispersed in each combination. Each combination is arranged so as to be vertically and horizontally symmetrical with respect to the holding table 5.

  In the present embodiment, the tactile meter is divided into the tactile sensation measuring table 10 and the dynamic strain amplifier BOX. However, the tactile sensation measuring table 10 and the dynamic strain amplifier BOX 20 are of course not limited to this configuration. It may be of an integrated type including

The figure which shows the measuring method of the frictional force when performing the simulation application act to the emulsion sample The figure which shows the time change of the frictional force when performing the simulation application act to the emulsion sample The figure which shows a mode when performing the simulated application act with a finger to cream The figure which shows the time change of the load and the frictional force when performing the simulated application action with the finger to the cream The figure which shows the time change of the load when performing the simulated application act with the finger to the cosmetic base sample The figure which shows the time change of the frictional force when performing the simulated application act with the finger to the cosmetic base sample The figure which shows the structure in one Embodiment of the tactile meter in this invention. Diagram showing the specific structure of the tactile sensation measurement table The figure which shows the other Example (the 1) of a tactile sense measurement stand The figure which shows the other Example (the 2) of a tactile sense measurement stand

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base 2 1st elastic member 3 Connecting member 4 2nd elastic member 5 Holding stand 6 Strain meter 7 Stopper 10 Tactile sense measurement stand 20 Dynamic strain amplifier BOX
81 Table 82 Artificial skin 83 Sample 84 Weight 85 Stress sensor 91 Finger

Claims (9)

A holding stand for holding the evaluation target on the surface;
A frictional force generated when rubbing the surface of the evaluation object along a first direction parallel to the surface of the holding table, and a second force perpendicular to the surface of the holding table generated when rubbing the surface of the evaluation object Detecting means capable of independently detecting the load in the direction;
An output means for outputting the detected load and the frictional force separately. The detection means has one end fixed on the base and having a portion extending substantially in the first direction, and one end fixed at a position away from the one end of the first elastic member. A second elastic member having a portion extending in the second direction, the other end being fixed to the holding table, and the first elastic member extending in the first direction by the load. A first strain-electrical signal converter that detects a distortion that occurs between the one end and a position away from the one end and outputs an electric signal corresponding to the distortion, and the frictional force, And a second strain / electrical signal converter for detecting a strain generated in a portion extending in the substantially second direction of the second elastic member and outputting an electrical signal corresponding to the strain. ,
The first elastic member may be distorted by the load applied via the second elastic member;
The second elastic member may be distorted by the frictional force;
The tactile meter according to claim 1, wherein the output means is an output means of an electric signal output from the first and second strain / electrical signal converters.   The tactile sensation meter according to claim 2, wherein the first and second strain / electrical signal converters are strain meters.   The tactile meter according to claim 2 or 3, wherein the first and second elastic members are metal rod-shaped members.   The tactile meter according to claim 4, wherein a thin portion is provided in an intermediate portion of the rod-shaped member, and the strain / electrical signal converter is attached to the thin portion.   The tactile meter according to any one of claims 2 to 5, wherein a position away from the one end of the first elastic member and the one end of the second elastic member are directly fixed.   The position away from the one end of the first elastic member and the one end of the second elastic member are fixed via a connecting member having a portion extending substantially in the first direction. The tactile meter according to any one of claims 2 to 5. A plurality of combinations comprising the first and second elastic members and the first and second strain / electrical signal converters;
The tactile meter according to any one of claims 2 to 7, wherein the plurality of combinations are arranged so that the load and the frictional force are distributed to each of the plurality of combinations.   A first stopper for restricting a movable range in the second direction by the load of the first elastic member; and a first stopper for restricting a movable range in the first direction by the friction force of the second elastic member. The tactile meter according to claim 2, further comprising two stoppers.

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