JPWO2019159493A1 - Motion detection sensor and motion detection method - Google Patents

Abstract

One aspect of the motion detection sensor (1) is a motion detection sensor that is attached to a finger and detects the motion of the finger, and is a support member fixed to the finger and a support member that is supported by the support member and acts from the finger. It has a triaxial stress sensor (13) that detects axial stress, and an acceleration sensor (14) that is supported by a support member and detects the acceleration of the finger when the finger moves.

Description

The present invention relates to a motion detection sensor and a motion detection method.

Generally, when applying makeup, various cosmetics and makeup tools are used. In some cosmetics, the practitioner who applies the makeup directly grasps the cosmetics to apply the makeup (for example, mascara, eyeliner, etc.). In addition, the practitioner may use makeup tools (various brushes such as lip brush and teak brush, makeup puff, foundation sponge, cotton, etc.) when applying makeup.

When applying makeup in this way, the practitioner picks up cosmetics and makeup tools (hereinafter collectively referred to as makeup tools and the like) and uses them. Therefore, it is important to improve the usability of cosmetic tools and the like when the practitioner directly grips them. In addition, it is desirable that the usability of cosmetic tools and the like can be quantitatively detected so that the improvement in usability can be objectively judged.

In order to quantitatively detect the feeling of use of the makeup tool or the like, it is necessary to detect the movement of the fingertip when applying makeup and the feeling felt by the fingertip when the movement is performed. The feel of the fingertips can be obtained by performing a sensory test on the subject (a person who uses a makeup tool or the like). On the other hand, the movement of the fingertip can be detected by using a movement detection sensor as disclosed in Patent Document 1. In the sensor disclosed in Patent Document 1, a finger is sandwiched between arms, and a strain gauge attached to the arm detects deformation of the finger.

Japanese Unexamined Patent Publication No. 2013-3782

However, since the subjectivity of the subject greatly affects the feel obtained by the sensory test, the sensory test is not sufficient for making an objective judgment. According to the invention disclosed in Patent Document 1, although the intended purpose can be achieved, it is not sufficient to accurately evaluate the feel of the fingertip.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a motion detection sensor and a motion detection method capable of performing detection suitable for objectively determining the feel of a subject's fingertips. To do.

One aspect of the motion detection sensor is a motion detection sensor that is attached to a finger and detects the motion of the finger, that is, a support member fixed to the finger and a support member supported by the support member and acting from the finger. It is characterized by having a triaxial stress sensor that detects axial stress and an acceleration sensor that is supported by the support member and detects the acceleration of the finger when the finger moves.

One aspect of the motion detection method is a step of attaching a motion detection sensor equipped with a triaxial stress sensor and an acceleration sensor to a finger and moving the finger while bringing the finger into contact with the surface of an object, and moving the finger. It is characterized by having a step of totaling the stress in the triaxial direction detected by the motion detection sensor and the acceleration detected by the acceleration sensor.

According to the disclosed technology, it is possible to improve the degree of freedom in arranging wiring in the semiconductor chip including the power switch circuit.

FIG. 1 is a top view showing an motion detection sensor according to an embodiment of the present invention. FIG. 2 is a perspective view from the upper surface showing the motion detection sensor according to the embodiment of the present invention. FIG. 3 is a bottom view from the top surface showing the motion detection sensor according to the embodiment of the present invention. FIG. 4 is a front view showing a state in which the motion detection sensor according to the embodiment of the present invention is attached to a finger. FIG. 5 is a perspective view showing a state in which the motion detection sensor according to the embodiment of the present invention is attached to a finger. FIG. 6 is a perspective view showing the substrate and the triaxial stress sensor. FIG. 7 is a plan view showing a triaxial stress sensor. FIG. 8A is a schematic view showing the configuration of a stress detection unit for shear stress included in the triaxial stress sensor. FIG. 8B is a schematic view showing the operation of the stress detection unit for shear stress included in the triaxial stress sensor. FIG. 9 is a front view showing a state in which a modified example of the motion detection sensor according to the embodiment of the present invention is attached to a finger.

Cosmetics are products in which functional values such as moisturizing and UV protection, as well as emotional values such as "smoothness" and "smoothness" and a sense of quality are important. Sensitivity value as the value of industrial products is realized based on the information obtained through the five human senses. Since the taste of cosmetics is often influenced by subtle differences in texture, the tactile sensation felt through the tactile sensation is important. In particular, in skin care cosmetics that are used by rubbing on the skin, many sensibility words related to tactile sensation such as "moist" and "smooth" are often used as expressions for product evaluation.

However, these Kansei words have no engineering definition, and their definitions and degrees differ depending on individual values and experiences. It is difficult to objectively grasp the sensibilities because they fluctuate and fluctuate according to the environment and circumstances. Further, in general, tactile movements such as tactile pressure and finger movement affect the recognition of tactile sensations such as "roughness" and "smoothness" at the fingertips. That is, the type and degree of the perceived sensitivity words differ depending on the difference in tactile pressure such as "strongly press" and "lightly press", and the difference in the speed of tactile movements of "quickly touch" and "slowly touch".

It is important to understand and share tactile movements and related skills. However, it is difficult to accurately grasp an individual's tactile movements and transmission of fingertip nuances through words that indicate an ambiguous degree such as "a little tighter" and "softly touch". As described above, it is difficult to share the tactile pressure in the tactile motion with others, and it is not easy to objectively confirm the state of the tactile motion of oneself. Therefore, the tactile pressure in the tactile motion can be said to be tacit knowledge, similar to the Kansei words that indicate the individual tactile sensation such as "roughness" and "smoothness".

The leological properties of skin care cosmetics change continuously due to the volatilization of the base water on the skin. Humans perceive this change by sharing the finger and skin. Tactile sensation is perceived by sensory receptors such as patchni and Meissner corpuscles present on the skin and fingers. These sensory receptors ignite at specific frequencies of vibrations that accompany tactile movements. For example, the Patchuni body ignites for vibrations in the middle frequency band of 200 Hz to 500 Hz, and the Meissner body ignites for vibrations in the low frequency band.

In addition, the sensory receptors of the finger perceive not only vibration but also the deformed state of the finger due to friction. Therefore, in order to more objectively evaluate the feel of the subject's fingertips, measurement of vibration and friction is extremely important. However, according to the conventional motion detection sensor, although it is possible to detect the tactile pressure, it is not possible to detect what kind of friction is occurring with high accuracy. Based on such a new idea, the present inventors have come up with the following embodiments of the invention.

Hereinafter, embodiments will be specifically described with reference to the accompanying drawings. 1 to 5 are diagrams showing motion detection sensors according to an embodiment of the present invention. FIG. 1 is a top view, FIG. 2 is a perspective view from the top surface, and FIG. 3 is a bottom view. FIG. 4 is a front view in a state of being attached to a finger, and FIG. 5 is a perspective view in a state of being attached to a finger.

The motion detection sensor 1 according to the present embodiment has a function of detecting the motion of the finger 31 of the subject as an object to be inspected. The motion detection sensor 1 includes the housing 11, the triaxial stress sensor 13, the acceleration sensor 14, and the cushioning material 15, and is attached to the finger 31 to detect the motion of the finger 31.

The housing 11 houses the cushioning material 15. However, the housing 11 includes a portion that exposes the cushioning material 15, and the cushioning material 15 can come into contact with the side portion of the finger 31 in the mounted state. The triaxial stress sensor 13 is embedded in the cushioning material 15 together with the substrate 12 so that the detection surface thereof faces the finger 31. A flexible flat cable (FFC) 16 is connected to the triaxial stress sensor 13 through the substrate 12, and the other end of the FFC 16 is connected to the control substrate 20 in the cushioning material 15. The acceleration sensor 14 is mounted on, for example, the control board 20. Further, the control board 20 includes a control circuit 23 that aggregates the detection results of the triaxial stress sensor 13 and the detection results of the acceleration sensor 14.

The cushioning material 15 is made of, for example, a rubber material such as a silicone rubber material, is in contact with the finger 31 in the mounted state, and applies a stress to the triaxial stress sensor 13 according to the amount of deformation of the finger 31 when the finger 31 operates. To do. On the other hand, the housing 11 is made of a highly rigid material such as hard plastic, and is not substantially deformed by the stress applied to the triaxial stress sensor 13 by the cushioning material 15. The substrate 12 is also made of a highly rigid material, and is not substantially deformed by the stress applied to the triaxial stress sensor 13 by the cushioning material 15. That is, the cushioning material 15 is more easily elastically deformed than the housing 11 and the substrate 12. In the present embodiment, the housing 11, the substrate 12, and the cushioning material 15 are included in the support member, and the substrate 12 corresponds to the base. The support member has a holding portion 21 that holds the finger 31 in the mounted state, and also has a contact portion 22 that comes into contact with the finger 31 on the root side of the finger 31 with respect to the holding portion 21. The sandwiching portion 21 extends from the contact portion 22 to both sides of the finger 31 so that the claw 32 can be visually recognized in the mounted state. Further, since the housing 11 keeps a constant shape during the operation of the finger 31, this support member keeps a constant outer shape during the operation of the finger 31.

Here, the triaxial stress sensor 13 will be described. FIG. 6 is a perspective view showing the substrate 12 and the triaxial stress sensor 13. FIG. 7 is a plan view showing the triaxial stress sensor 13.

As shown in FIG. 6, the triaxial stress sensor 13 is provided on the substrate 12, and the substrate 12 is attached with an FFC 16 electrically connected to the triaxial stress sensor 13. In the present embodiment, two FFCs 16 are attached to the substrate 12, but the number of FFCs 16 is not limited. As shown in FIG. 7, the triaxial stress sensor 13 includes a stress detection unit 13x that detects stress in the x-axis direction, a stress detection unit 13y that detects stress in the y-axis direction, and a stress detection unit that detects stress in the z-axis direction. Includes part 13z. The stress detection unit 13x and the stress detection unit 13y detect stresses in two directions parallel to the detection surface 13s and orthogonal to each other. The stress detection unit 13z detects the stress in the direction perpendicular to the detection surface 13s. That is, the stress detection unit 13x and the stress detection unit 13y detect the shear stress acting on the triaxial stress sensor 13, and the stress detection unit 13z detects the normal stress acting on the triaxial stress sensor 13.

Here, the stress detection unit 13x, which is one of the shear stress units, will be described. FIG. 8A is a schematic view showing the configuration of the stress detection unit 13x. FIG. 8B is a schematic view showing the operation of the stress detection unit 13x.

As shown in FIG. 8A, the stress detection unit 13x includes the conductive films 30, 40 and 50 provided on the substrate. A beam 43 is provided between the conductive film 30 and the conductive film 40, and a beam 53 is provided between the conductive film 30 and the conductive film 50. The beam 43 has an i-type Si film 41 in which impurities are not introduced and an impurity Si film 42 in which impurities are introduced and is conductive. The beam 53 has an i-type Si film 51 in which impurities are not introduced and an impurity Si film 52 in which impurities are introduced and is conductive. The Si film 41 and the impurity Si film 42 are in contact with each other in the x-axis direction, and the Si film 51 and the impurity Si film 52 are in contact with each other in the x-axis direction. The beams 43 and 53 extend in parallel with each other, and the impurity Si film 42 and the impurity Si film 52 face each other. A Wheatstone bridge circuit is composed of the impurity Si films 42 and 52 and the resistors R1 and R2. A voltage E is supplied between the connection point between the resistor R1 and the resistor R2 and the conductive film 30, and the potential difference e ₀ between the conductive film 40 and the conductive film 50 is measured.

The resistance of the impurity Si films 42 and 52 changes according to the magnitude of the stress acting on itself due to the piezoresistive effect. That is, as shown in FIG. 8B, when the shear stress 35 acts on the beams 43 and 53, the resistance of the impurity Si films 42 and 52 changes according to the magnitude thereof. Therefore, the potential difference e ₀ reflects the magnitude of the shear stress 35, and the magnitude of the x-axis direction component of the shear stress can be detected by measuring the potential difference e ₀ . Since the position of the impurity Si film in the x-axis direction with respect to the Si film is different between the beam 43 and the beam 53, the change in the resistance value is opposite. That is, if the resistance value of the impurity Si film 42 increases, the resistance value of the impurity Si film 52 decreases, and if the resistance value of the impurity Si film 42 decreases, the resistance value of the impurity Si film 52 increases.

The stress detection unit 13y can detect the magnitude of the y-axis direction component of the shear stress by the same mechanism as the stress detection unit 13x. With respect to the stress detection unit 13z, the vertical stress acting on the detection surface can be detected by deforming the beam in the direction perpendicular to the detection surface.

As described above, in the present embodiment, the triaxial stress sensor 13 can detect the stress in the orthogonal triaxial direction acting from the finger 31.

The acceleration sensor 14 is, for example, a 3-axis acceleration sensor. As the acceleration sensor 14, for example, one having an acceleration sensitivity of 0.061 mg, 0.122 mg, 0.244 mg, 0.488 mg and an acceleration range of ± 2 g, ± 4 g, ± 8 g, ± 16 g can be used. Further, as the acceleration sensor 14, a 6-axis acceleration sensor that can detect angular acceleration in addition to acceleration in the 3-axis direction can also be used. As such a 6-axis acceleration sensor, for example, the detectable angular acceleration sensitivity is 4.375 mdps, 8.75 mdps, 17.50 mdps, 35, 70 mdps, and the angular acceleration range is ± 125 dps, ± 250 dps, in addition to the acceleration sensitivity. Those of ± 500 dps, ± 1000 dps, ± 2000 dps can be used. An angular acceleration sensor that detects only angular acceleration may be used.

Next, the operation of the motion detection sensor 1 will be described.

As shown in FIG. 5, the motion detection sensor 1 is attached to the finger 31 by sandwiching both side portions of the claw 32 of the finger 31 with the sandwiching portion 21 so that the contact portion 22 comes into contact with the finger 31. At this time, the finger 31 is slightly deformed, this deformation propagates to the cushioning material 15, the cushioning material 15 is elastically deformed, and stress corresponding to the amount of this deformation acts on the triaxial stress sensor 13. Further, since the motion detection sensor 1 contacts the finger 31 at at least three places, the relative position of the motion detection sensor 1 with respect to the finger 31 is fixed.

When a subject wearing the motion detection sensor 1 rubs cosmetics on the skin, a complicated stress acts between the skin and the abdomen of the finger 31, and both sides of the finger 31 are also deformed in a complicated manner. Deformation of both sides of the finger 31 propagates to the cushioning material 15, and the cushioning material 15 is elastically deformed in a complicated manner, and stress corresponding to the amount of this deformation acts on the triaxial stress sensor 13. Then, the triaxial stress sensor 13 detects the shear stress and the normal stress acting on itself by the stress detection units 13x, 13y and 13z. Further, in parallel with the detection of the triaxial stress by the triaxial stress sensor 13, the acceleration sensor 14 detects the acceleration of the finger 31 at the time of rubbing. These detection results are input to the control circuit 23 mounted on the control board 20 via the FFC 16 and the like, and the control circuit 23 aggregates them. The aggregated result is transmitted to an electronic device such as an external computer. This transmission may be performed by wired communication or wireless communication. Then, in an electronic device, it is analyzed from what direction and what strength of stress is applied to the finger 31 during rubbing.

According to the motion detection sensor 1, the deformation of the side portion of the finger 31 can be detected in three dimensions. Since the deformation of the side part of the finger 31 reflects the deformation of the finger 31 itself, the deformation of the side part of the finger 31 is detected three-dimensionally, and the detection result and the detection result by the acceleration sensor 14 are analyzed for painting. It is possible to estimate from what direction and what strength of stress is acting on the finger 31. Then, this estimation result can be objectively quantified without the subjectivity of the subject. Therefore, according to the motion detection sensor 1, it is possible to perform detection suitable for objectively determining the feel of the subject's fingertips.

The result of motion detection obtained in this way can be utilized as follows.

For example, a cosmetic expert and a beginner detect movements during rubbing of cosmetics, and quantify and compare these results. After this comparison, beginners can improve their skills by training to obtain detection results similar to those of experts. According to this method, makeup techniques can be objectively compared, so that a beginner can easily understand what kind of correction should be made at what timing during rubbing.

For example, even an expert can compare the results of his / her own motion detection at regular intervals, find improvements, and train him / her to apply with a higher technique.

The stress acting on the finger 31 is affected not only by the movement of the subject but also by the state of the cosmetics to be rubbed. Therefore, for example, the state of cosmetics can be quantified from the result of motion detection. Therefore, in the development of cosmetics, the change in cosmetics that occurs between the finger 31 and the skin and the tactile sensation perceived accordingly can be quantified and effectively utilized in the design of the texture of the cosmetics.

For example, not only the stress acting on the finger 31 but also the stress acting on the skin can be quantified. When not only the tactile sensation on the finger 31 but also the tactile sensation on the skin is regarded as important, the stress acting on the skin can be quantified to enable a more objective evaluation.

As shown in FIG. 9, it is preferable that the cushioning material 15 includes an expansion portion 19 that expands toward the finger 31 on the triaxial stress sensor 13 in the mounted state. Since the cushioning material 15 includes the expansion portion 19, the deformation of the cushioning material 15 is concentrated on the triaxial stress sensor 13, and more accurate detection can be performed.

There are individual differences in the shape and deformability of the finger 31, and the shape and deformability of the finger 31 may change even for the same subject. Therefore, in order to perform more accurate detection, prior to the motion detection process of the finger 31 using the motion detection sensor 1, a calibration process that correlates the deformation amount of the side portion of the finger 31 with the value of the finger contact force. It is preferable to perform (calibration).

In the present embodiment, the aggregated result is transmitted from the motion detection sensor 1 to the outside and the analysis is performed externally. However, the motion detection sensor 1 is provided with an analysis circuit, and this analysis circuit analyzes the stress, and the analysis result is obtained. It may be sent to the outside.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-mentioned specific embodiments, and various modifications are made within the scope of the gist of the present invention described in the claims. And can be changed.

For example, it can be used for evaluation of skin condition by directly contacting the bare skin with a finger without using a makeup tool or the like.

This application claims priority based on Patent Application No. 2018-021762 filed with the Japan Patent Office on February 19, 2018, and includes all of these contents.

1 Motion detection sensor 11 Housing 12 Board 13 Triaxial stress sensor 14 Accelerometer 15 Cushioning material 16 Flexible flat cable 19 Expansion part 20 Control board 21 Holding part 22 Contact part 23 Control circuit

Claims (18)

A motion detection sensor that is attached to a finger and detects the motion of the finger.
The support member fixed to the finger and
A triaxial stress sensor that is supported by the support member and detects stress in the triaxial direction that acts from the finger.
An acceleration sensor that is supported by the support member and detects the acceleration of the finger when the finger moves,
A motion detection sensor characterized by having. The motion detection sensor according to claim 1, wherein the acceleration sensor includes at least one of a three-axis acceleration sensor that detects acceleration in the three-axis direction and an angular acceleration sensor that detects angular acceleration. It is characterized by having a buffer material that covers the triaxial stress sensor, is in contact with the finger in a mounted state, and applies stress to the triaxial stress sensor according to the amount of deformation of the finger when the finger is operated. The motion detection sensor according to claim 1. The motion detection sensor according to claim 3, wherein the cushioning material is an elastic material. The motion detection sensor according to claim 4, wherein the elastic material is a rubber material. The motion detection sensor according to claim 4, wherein the elastic material is a silicone rubber material. The motion detection sensor according to claim 3, wherein the cushioning material has an inflated portion that expands toward the finger on the triaxial stress sensor in a mounted state. The motion detection sensor according to claim 1, wherein the support member maintains a constant shape during the motion of the finger. The motion detection sensor according to claim 1, wherein the support member has a holding portion for holding the finger in a mounted state. The motion detection sensor according to claim 9, wherein the triaxial stress sensor is fixed to surfaces of the sandwiching portions facing each other. The support member
A housing that houses the 3-axis stress sensor and
A base provided on the holding portion in the housing and
Have,
The motion detection sensor according to claim 9, wherein the triaxial stress sensor is fixed to the base. The support member has a contact portion that comes into contact with the finger on the root side of the finger with respect to the triaxial stress sensor.
The motion detection sensor according to claim 9, wherein the sandwiching portion extends laterally of the finger so that the claw can be visually recognized from the contact portion in the mounted state. A process of attaching a motion detection sensor equipped with a 3-axis stress sensor and an acceleration sensor to a finger and moving the finger while bringing the finger into contact with the surface of an object.
A step of totaling the stress in the triaxial direction detected by the motion detection sensor while moving the finger and the acceleration detected by the acceleration sensor, and
An operation detection method characterized by having. The motion detection method according to claim 13, wherein the acceleration sensor includes at least one of a three-axis acceleration sensor that detects acceleration in the three-axis direction and an angular acceleration sensor that detects angular acceleration. The motion detection method according to claim 13, further comprising a step of quantifying the state of the surface of the object based on the aggregation result of the stress in the three axial directions and the acceleration. The motion detection method according to claim 13, further comprising a step of quantifying the stress received by the object based on the aggregation result of the stress in the three axial directions and the acceleration. The motion detection method according to claim 15, wherein in the step of moving the finger, a substance is rubbed on the surface of the object. The motion detection method according to claim 13, further comprising a step of acquiring a plurality of aggregation results of the stress in the three axial directions and comparing the aggregation results of the plurality of aggregation results.

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