JP6114562B2 - Motion detection sensor and motion detection device - Google Patents

Description

  The present invention relates to a motion detection sensor and a motion detection device that are mounted on a finger to detect the motion.

  Generally, when performing makeup, various cosmetics and makeup tools are used. Among cosmetics, a practitioner who performs makeup performs makeup by directly holding the cosmetic (for example, mascara, eyeliner, etc.). In addition, when performing makeup, the practitioner may use makeup tools (various brushes such as lip brushes and teak brushes, makeup puffs, foundation sponges, and cotton).

  When performing makeup in this way, the practitioner uses cosmetics and makeup tools (hereinafter collectively referred to as makeup tools) in hand. Therefore, it is important for a cosmetic tool or the like to improve the feeling of use when the practitioner directly holds it. In addition, it is desirable that the feeling of use of a cosmetic tool or the like can be quantitatively detected so that improvement in usability can be objectively determined.

  In order to quantitatively detect the feeling of use of the makeup tool or the like, it is necessary to detect the motion of the fingertip when performing makeup and the feel felt by the fingertip when performing the motion.

  The feeling felt by the fingertip can be obtained by performing a sensory test on a practitioner (a person who uses a makeup tool or the like). However, on the other hand, the motion of the fingertip can be detected by using a motion detection sensor as disclosed in Patent Document 1. In the sensor disclosed in this Patent Document 1, a strain sensor is arranged on a fingernail, and the motion of the fingertip is detected by detecting strain generated on the fingernail during finger motion.

JP 2001-265522 A

  However, since the invention disclosed in Patent Document 1 has a configuration in which a sensor is directly attached to a nail using an adhesive or the like, the amount of distortion generated during operation is small, and sufficient measurement accuracy cannot be obtained. There was a problem. In addition, there is a problem in that the size and rigidity of the nail vary among individuals, and the detection result depends on the individual characteristics of the subject's nail.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a motion detection sensor and a motion detection device capable of performing finger motion with high accuracy.

From the first point of view, the above problem is
A motion detection sensor that is attached to a finger and detects the motion of the finger,
A base located at the top of the finger in a worn state;
A first arm extending from one side edge of the base to one side of the finger;
A second arm extending from the other side edge of the base to the other side of the finger and sandwiching the finger with the first arm;
First strain measuring means for measuring strain generated in the first arm when the finger is moved, as the finger is deformed;
Second strain measuring means for measuring strain generated in the second arm as the finger is moved when the finger is moved;
I have a,
The first arm and the second arm can be solved by a motion detection sensor characterized in that an opening is formed at a central position .

  According to the disclosed motion detection sensor, the strain generated in the first arm and the strain generated in the second arm can be independently measured, so that the finger motion can be accurately detected. Become.

FIG. 1 is a front view showing a state in which a motion detection sensor according to an embodiment of the present invention is attached to a finger. FIG. 2 is a side view showing a state where a motion detection sensor according to an embodiment of the present invention is attached to a finger. FIG. 3 is a perspective view of a motion detection sensor according to an embodiment of the present invention. FIG. 4 is a diagram for explaining a strain gauge. FIG. 5 is a circuit configuration diagram of an operation detection apparatus according to an embodiment of the present invention. FIG. 6 is a diagram illustrating an example of the output of the motion detection apparatus according to the embodiment of the present invention. FIG. 7 is a hardware configuration diagram of the motion detection apparatus according to the embodiment of the present invention. FIG. 8 is a flowchart showing an operation detection process of the operation detection apparatus according to the embodiment of the present invention. FIG. 9 is a diagram for explaining a calibration process for the motion detection sensor according to the embodiment of the present invention. FIG. 10 is a diagram for explaining a calibration plate used for the calibration process for the motion detection sensor according to the embodiment of the present invention.

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

  1 to 3 show a motion detection sensor according to an embodiment of the present invention. 1 is a front view of the state where the motion detection sensor 10 is attached to the finger A (only the covering member 17 is shown in cross section), FIG. 2 is a side view of the state where the motion detection sensor 10 is attached to the finger A, and FIG. It is a perspective view of the sensor 10 (illustration of the covering member 17 is abbreviate | omitted in FIG.2 and FIG.3).

  As shown in FIGS. 1 and 2, the motion detection sensor 10 according to the present embodiment has a function of detecting a motion of a finger A, which is a test subject, using a finger A of a person (subject) as the test subject. It is. The motion detection sensor 10 includes a base portion 11, a first arm portion 12, a second arm portion 13, a first strain measuring portion 14 (corresponding to a first strain measuring means), and a second strain measuring portion. 15 (corresponding to the second strain measuring means), an acceleration sensor 16, a covering member 17, and the like.

  The base part 11, the first arm part 12, and the second arm part 13 serving as a base part are each formed of a plate-like member made of metal. In the present embodiment, the base portion 11 and the first and second arms 12 and 13 are integrally formed. However, you may comprise the base part 11 and the 1st and 2nd arms 12 and 13 by a different metal material.

  In this case, it is desirable that the base portion 11 is made of an aluminum plate, and the first and second arm portions 12 and 13 are made of a material having a spring property that is more easily elastically deformed than the base portion 11. Moreover, the joining method of the base part 11 and the 1st and 2nd arm parts 12 and 13 is not specifically limited, For example, it joins by welding, or it joins using fixing members, such as a screw. The method can be used.

  The first arm portion 12 is configured to extend downward (in the direction of arrow Z1 in the drawing) from one side edge portion (side edge portion in the direction of arrow X1 in the drawing) of the base portion 11 toward one side portion of the finger A. It is said that. Further, the second arm portion 13 extends downward (in the direction of arrow Z1 in the drawing) from the other side edge portion (side edge portion in the direction of arrow X2 in the drawing) of the base portion 11 toward the other side portion of the finger A. It is configured.

  That is, the first and second arm portions 12 and 13 are in a cantilever shape in which one end is fixed to the base portion 11 and the other end portion is a free end. Therefore, the free end sides of the first and second arms 12 and 13 are configured to be elastically deformable with respect to the base portion 11 in the directions indicated by arrows B1 and B2 in FIG.

  An opening 18 is formed at the center position of the first arm portion 12, and an opening 19 is also formed at the center position of the second arm portion 13. Thus, the first arm portion 12 is defined by the arm half body 12a and the arm half body 12b with the opening portion 18 as the center, and similarly, the second arm portion 13 is also formed with the arm half body 13a with the opening portion 19 as the center. The arm half 13b is defined.

  Thus, by forming the openings 18 and 19 at the centers of the arms 12 and 13, the arms 12 and 13 are elastically deformed in the directions of arrows B1 and B2, but in the twisting direction. Is prevented from being deformed. Thereby, it is possible to prevent the deformation in the twisting direction from being mixed as an error in the motion detection described later, and to improve the detection accuracy.

  The acceleration sensor 16 is disposed on the upper portion of the base portion 11. The acceleration sensor 16 detects the acceleration of the finger A when the finger A moves. As the acceleration sensor 16, for example, a triaxial acceleration sensor can be used. The covering member 17 is a resin material and is formed on the upper portion of the base portion 11 so as to cover the acceleration sensor 16.

  Next, the first strain measurement unit 14 and the second strain measurement unit 15 will be described.

  The first strain measurement unit 14 includes first to fourth strain gauges 14a, 14b, 14c, and 14d, and the second strain measurement unit 15 includes first to fourth strain gauges 15a, 15b, and 15c. , 15d (the first to fourth strain gauges 15a, 15b, 15c, 15d correspond to the fifth to eighth strain gauges described in claims).

  Each strain gauge 14a-14d, 15a-15d is set as the same structure. For this reason, the strain gauge 14a is enlarged and shown in FIG. The strain gauge 14a is configured such that a resistor 31 is formed in a predetermined pattern (for example, a meander pattern) on a film-like base material 32. In addition, wiring 33 is connected to both ends of the resistor 31.

  The resistor 31 has a characteristic of changing the electric resistance by being deformed. Therefore, by measuring the resistance change of the resistor 31 output from the wiring 33 as a voltage change, it is possible to measure the strain.

  Here, the arrangement positions of the strain gauges 14a to 14d and 15a to 15d constituting the first and second strain measurement units 14 and 15 will be described mainly with reference to FIG.

  The first strain measurement unit 14 is disposed on the first arm unit 12. The first strain gauge 14 a constituting the first strain measurement unit 14 is disposed on the outer surface of the arm half body 12 a constituting the first arm unit 12. Further, the second strain gauge 14 b is disposed on the outer surface of the arm half body 12 b constituting the first arm portion 12.

  The third strain gauge 14c is disposed on the inner side surface (the surface on the side facing the finger A) of the arm half body 12a. Further, the fourth strain gauge 14d is disposed on the inner side surface (the surface on the side facing the finger A) of the arm half body 12b.

  Further, the first strain gauge 14a and the third strain gauge 14c are arranged to face each other with the arm half body 12a interposed therebetween. Similarly, the second strain gauge 14b and the fourth strain gauge 14d are arranged to face each other with the arm half body 12b interposed therebetween.

  The second strain measurement unit 15 is disposed on the second arm unit 13. The first strain gauge 15 a constituting the second strain measurement unit 15 is disposed on the outer surface of the arm half 13 a constituting the second arm unit 13. Further, the second strain gauge 15 b is disposed on the outer surface of the arm half 13 b constituting the second arm portion 13.

  The third strain gauge 15c is disposed on the inner side surface (the surface on the side facing the finger A) of the arm half 13a. Further, the fourth strain gauge 15d is disposed on the inner side surface (the surface on the side facing the finger A) of the arm half 13b.

  Further, the first strain gauge 15a and the third strain gauge 15c are arranged so as to face each other via the arm half body 13a. Similarly, the second strain gauge 15b and the fourth strain gauge 15d are arranged to face each other via the arm half body 13b.

  Further, the pair of first and third strain gauges 14a and 14c disposed on the arm half body 12a is paired with the pair of first and third strain gauges 15a and 15c disposed on the arm half body 13a. It arrange | positions so that it may oppose through the mounting | wearing space part of A.

  Similarly, the pair of second and fourth strain gauges 14b and 14d disposed on the arm half body 12b is paired with the pair of second and fourth strain gauges 15b and 15d disposed on the arm half body 13b. The finger A is disposed so as to face each other through the mounting space portion.

  The motion detection sensor 10 having the above configuration is attached to the finger A. When the motion detection sensor 10 is attached to the finger A, as shown in FIGS. 1 and 2, the base portion 11 comes into contact with the upper portion of the finger A (upper portion of the nail), and the first and second arm portions 12, 13 abuts on both sides of the finger A. In this mounted state, the first and second arm portions 12 and 13 are slightly elastically deformed in the B1 direction. For this reason, the finger A is held between the first and second arm portions 12 and 13 by this elastic force. The motion detection sensor 10 is attached to the finger A by this clamping force.

  Here, in a state where the motion detection sensor 10 is attached to the finger A, the finger A is pressed against the base 35 as shown in FIG. 1 and then operated in the X1 and X2 directions (shear direction) in the figure. Suppose. As the finger A moves (moves) on the base 35 in the directions of arrows X1 and X2, the finger A is deformed.

  For example, when the finger A moves on the base 35 in the direction of the arrow X1, the frictional force generated between the finger A and the base 35 acts in the X2 direction. Is pulled as indicated by an arrow C1 in FIG. 1, and the portion of the finger A on the X2 direction side is pushed as indicated by an arrow C2 in FIG. Further, when the finger A moves on the base 35 in the direction of the arrow X2, an opposite operation occurs.

  Thus, when the finger A moves, the finger A is deformed asymmetrically on the X1 direction side and the X2 direction side. As the finger A is deformed in this way, different distortions corresponding to the deformation amount of the finger A are generated in the first and second arm portions 12 and 13 of the motion detection sensor 10 attached to the finger A. To do.

  The strain generated in the first and second arm portions 12 and 13 is measured by the respective strain gauges 14a to 14d and 15a to 15d constituting the first and second strain measuring portions 14 and 15 (first Measured value). That is, the strain generated in the first arm unit 12 is measured by the first strain measuring unit 14 (first to fourth strain gauges 14a to 14d), and the strain generated in the second arm unit 13 is the second strain. The second strain measurement unit 15 (first to fourth strain gauges 15a to 15d) measures the second measured value.

  The motion detection sensor 10 having the above-described configuration has a very simple configuration in which the base portion 11 made of a thin plate-shaped metal material and the first and second strain measurement portions 14 and 15 are disposed on the arm portions 12 and 13. It is. The strain gauges 14a to 14d and 15a to 15d are thin and lightweight in which a resistor 31 is formed on a film-like base material 32. For this reason, the motion detection sensor 10 is small and lightweight, and can improve wearability and usability.

  5 and 7 show the motion detection apparatus 20 according to an embodiment of the present invention. FIG. 5 is a circuit configuration diagram of the motion detection device 20, and FIG. 7 is a hardware configuration diagram of the motion detection device 20.

  The motion detection device 20 includes a motion detection sensor 10, an arithmetic device 30, a calibration plate 40, an output device 50, and the like.

  The motion detection sensor 10 is configured to include the first strain measurement unit 14 and the second strain measurement unit 15 as described above. As described above, the first and second strain measuring units 14 and 15 include strain gauges 14a to 14d and 15a to 15d that measure strains of the first and second arm portions 12 and 13, respectively.

  However, in each of the strain gauges 14a to 14d and 15a to 15d, the resistance change due to the strain is small. Therefore, in the present embodiment, the strain gauges 14a to 14d constitute the first Wheatstone bridge circuit WB1, and the strain gauges 15a to 15d constitute the second Wheatstone bridge circuit WB2, thereby improving the measurement accuracy. Yes.

  The power supply 21 supplies power to the first strain measurement unit 14 (first Wheatstone bridge circuit WB1) and the second strain measurement unit 15 (second Wheatstone bridge circuit WB2). The first strain measurement unit 14 (WB1) detects a strain generated in the first arm unit 12 as the finger A moves. Further, the second strain measurement unit 15 (WB2) detects the strain generated in the second arm unit 13 with the movement of the finger A. The output of the first strain measurement unit 14 and the output of the second strain measurement unit 15 are supplied to the arithmetic device 30.

  The calibration plate 40 is used for the configuration process of the motion detection sensor 10. The calibration plate 40 will be described with reference to FIG. FIG. 10A is a plan view showing a schematic configuration of the calibration plate 40, and FIG. 10B is a side view showing a schematic configuration of the calibration plate 40.

  The calibration plate 40 is configured to include a detection table 41 and a load cell 42. As shown in FIG. 10B, the detection table 41 is a plate with which the finger A wearing the motion detection sensor 10 comes into contact. Load cells 42 are disposed at the four corner positions of the detection table 41, respectively.

In this embodiment, a triaxial load cell 42 (load cell capable of detecting loads of arrows F _X , F _Y , and F _Z in FIG. 10) is used, but at least a load in the vertical direction (Z1 direction) as will be described later. The motion detection sensor 10 can be calibrated even with a biaxial load cell capable of measuring Fz.

  Here, the calibration process of the motion detection sensor 10 will be described. Now, as shown in FIG. 10B, assume that the finger A of the subject wearing the motion detection sensor 10 is pressed against the detection table 41 of the calibration plate 40 (no movement in the X1 and X2 directions is performed).

  At this time, it is ideal that the strain in the X1 direction generated in the first strain measurement unit 14 and the strain in the X2 direction generated in the second strain measurement unit 15 are equal. However, according to the experiments of the present inventor, it is common that the deviation actually occurs due to personal habits.

  Therefore, before such movement detection of the finger A is started, if such an error (human error) exists just when the finger A is pressed vertically downward, accurate movement detection is performed. I can't. Therefore, in order to eliminate this error, calibration processing for the motion detection sensor 10 is performed.

  Since the error for calibration as described above includes a human error caused by the subject's wrinkle or the like, the calibration process described below is performed every time the subject changes.

  Hereinafter, a specific calibration method will be described.

In order to perform the calibration process, the test subject wears the motion detection sensor 10 on the finger A as shown in FIG. At this time, the pressing force _Fz is pressed so as to gradually increase. Then, to measure the pressing force F _z finger A when the load cell 42 of the calibration plate 40. At the same time, the voltage values E _X1 and E _X2 output from the first and second strain measurement units 14 and 15 of the motion detection sensor 10 are measured.

The amount of deformation of the finger A by the pressing force F _z finger A increases gradually becomes larger, thus the first voltage E _X1 and a second output from the strain measuring unit 14 of the voltage output from the strain measuring unit 15 E _X2 also increases gradually.

At this time, when there is no wrinkle in the pressing of the finger A of the subject and the pressing is performed uniformly in the X1 and X2 directions, the voltage _EX1 output from the first strain measuring unit 14 and the second strain measurement are performed. The voltages _EX2 output from the unit 15 are equal. However, generally, as described above, there is an individual error (such as wrinkles) in pressing the finger A, and the pressing method is biased in the X1 and X2 directions. For this reason, the values of the voltages E _X1 and E _X2 are generally different.

FIG. 9 is a diagram for explaining this. In the example shown in the figure, since the subject's finger A is pressed in a biased manner, the voltage value E _X1 output from the first strain measuring unit 14 that detects the strain in the X1 direction is the strain in the X2 direction. _Is larger than the voltage value E _X2 output from the second strain measurement unit 15 that detects (E _X1 > E _X2 ).

On the other hand, the average value E _av in the figure shows the voltage value E _av when the subject's finger A is pressed so that there is no wrinkle or the like and uniform distortion appears in the X1 and X2 directions. Yes. As described above, in this case, the voltage value output from the first strain measurement unit 14 and the output from the second strain measurement unit 15 are both the voltage value E _av .

In the calibration processing according to the present embodiment, correction processing is performed so that the X1 direction output E _X1 shown in FIG. 9 becomes the average value E _av, and correction is performed so that the X2 direction output E _X2 shown in FIG. 9 becomes the average value E _av. Process. If the correction coefficient for the output of the first strain measurement unit 14 is α and the correction coefficient for the output of the second strain measurement unit 15 is β, E _av = E _X1 × α and E _av = E _X2 × The correction values α and β that become β are calculated. The calculation of the correction values α and β is performed by the calculation unit 26 in the calculation device 30 (see FIG. 5). The correction coefficient alpha, beta is correlated to the load F _X of the Z1 direction.

  Here, returning to FIGS. 5 and 7, the description will be continued.

  As described above, the output of the first strain measurement unit 14 and the output of the second strain measurement unit 15 are supplied to the arithmetic device 30. The arithmetic device 30 is configured to include amplifiers 22 and 23, an adding unit 25, an arithmetic unit 26, and the like. The arithmetic device 30 can be configured as a CPU, for example.

  The output of the first distortion measurement unit 14 is amplified by the amplifier 22 and then supplied to the addition unit 25 and the calculation unit 26. The output of the second distortion measuring unit 15 is amplified by the amplifier 23 and then supplied to the adding unit 25 and the calculating unit 26.

In the adding unit 25, the sum of the output E _X1 from the first distortion measuring unit 14 and the output E _X2 from the second distortion measuring unit 15 is obtained (E _X1 + E _X2 ). The value obtained by the adder 25 is sent to the calculator 26 and also sent to the output terminal 28 as Z-direction data DA. The value of the Z-direction data DA shows the force F _Z finger A presses the base 35 downward in the vertical direction.

On the other hand, in the calculation unit 26, first, the output E _X1 from the first distortion measurement unit 14 is multiplied by the correction coefficient α obtained in the calibration process described above (E _X1 × α). Similarly, the output E _X2 from the second distortion measurement unit 15 is multiplied by the correction coefficient β obtained in the calibration process (E _X2 × β).

As described above, the output E _X1 from the first distortion measurement unit 14 is multiplied by the correction coefficient α, and the output E _X2 from the second distortion measurement unit 15 is multiplied by the correction coefficient β. The output value eliminates human errors such as wrinkles. Therefore, the value obtained by subtracting by the calculation unit 26 is based on the movement of the finger A (the movement operation in the X1 direction or the movement operation in the X2 direction) and the first arm unit 12 and the second arm unit. Only the difference in distortion generated in 13 is obtained.

The correction coefficient as the alpha, beta varies with changes in the Z1 direction of the load F _X. Therefore, in the present embodiment, a value obtained by adding the output _EX1 from the first distortion measuring unit 14 and the output _EX2 from the second distortion measuring unit 15 is sent from the adding unit 25 to the calculating unit 26. It is composed.

Each of these outputs E _X1 . The value obtained by adding E _X2 is a value correlated with the force with which the finger A presses the base 35 in the Z1 direction (the load F _{X in the} Z1 direction). Therefore, the correction coefficients α and β corresponding to the force with which the finger A currently presses the base 35 in the Z1 direction can be obtained from the added value (E _X1 + E _X2 ), and the outputs EX1 and EX2 are appropriately corrected. (This will be described later).

When the correction processing described above is completed, the calculation unit 26 outputs the corrected output value (E _X1 × α) of the first distortion measurement unit 14 and the corrected output value (E _X2 ) of the second distortion measurement unit 15. The difference from (× β) is obtained ((E _X1 × α) − (E _X2 × β)). The subtraction value obtained by the calculation unit 26 is sent to the output terminal 27 as operation data DS. This motion data DS is used as data for detecting this motion when the finger A moves in the X1 direction or the X2 direction.

As described above, in the motion detection device 20 according to the present embodiment, the correction coefficient α, which is obtained by the calibration process using the outputs E _X1 and E _X2 from the first and second strain measurement units 14 and 15 in the arithmetic unit 30. Since the correction is performed with β, human error can be eliminated, and the motion detection of the finger A by the motion detection sensor 10 can be performed with high accuracy.

  Next, the output device 50 will be described. The output terminal 27 and the output terminal 28 are connected to the output device 50 (see FIG. 7). The output device 50 according to the present embodiment includes a display unit, and the display unit is configured to display changes in output from the output terminals 27 and 28 over time. In the output device 50, the distortion is calculated based on the output values sent from the terminals 27 and 28, and this is displayed on the display unit. This display is shown as a table in which the vertical axis indicates distortion and the horizontal axis indicates time (see FIG. 6).

  Next, the motion detection process of the finger A using the motion detection sensor 10 performed by the arithmetic device 30 will be described. FIG. 8 is a flowchart showing the motion detection process of the finger A using the motion detection sensor 10 and the motion detection device 20.

  When the motion detection process is started, first, in step 10 (step is abbreviated as S in the figure), it is determined whether or not the calibration process is finished. If it is determined in step 10 that the calibration process has not been completed, the calibration process is performed.

In the calibration process, the subject who performs the motion detection process as described above presses the finger A vertically downward (Z1 direction) against the detection table 41 of the calibration plate 40. In step 12, the load _{F Z} with respect to the vertical downward direction (Z1 direction) transmitted from the load cell 42 at this time, the output voltage _E X1 of the first and second strain measurement unit 14, 15 is sent from the operation detection sensor 10, E _{Read X2} . Then, the correction coefficient as a parameter load F _Z with respect to the vertical downward direction (Z1 direction) on the basis of these alpha, calculates the beta.

Each correction factor as the alpha, beta denotes to correlate the load F _Z in the vertically downward direction (Z1 direction) of the finger A, the correction coefficient alpha, the beta is a function display alpha = Q and (F _Z) And can be shown as β = R (F _Z ). In step 14, α = Q (F _Z ) and β = R (F _Z ) are obtained.

  If the above calibration process is completed, or if it is determined in step 10 that the calibration process has already been completed, the process proceeds to step 16. The processing after Step 16 is the finger A motion detection processing.

In step 16, the finger A to which the motion detection sensor 10 is attached is moved on the base 35 in the shearing direction (arrow X1, X2 direction). Along with this operation, the output voltages E _X1 and E _X2 output from the first strain measuring unit 14 and the second strain measuring unit 15 are read.

In the subsequent step 18, the adding unit 25 performs an adding process of the output voltages E _X1 and E _X2 . As described above, this added value (E _X1 + E _X2 ) is sent to the calculation unit 26 and the output terminal 28.

Further, the arithmetic unit 26, the finger A on the basis of the sum value _(E X1 ₊ E _X2) is for calculating a load _{F Z} pressing the finger A vertically downward. Then, correction coefficients α and β are calculated from α = Q (F _Z ) and β = R (F _Z ) obtained in step 14 and the load F _Z. If the value of the load F _Z is N shown in FIG. 9 (F _Z = N), the correction coefficients α _N and β _N at that time are α _N = Q (N) and β _N = R (N). It becomes.

Subsequently, the calculation unit 26 is corrected after multiplying the output voltages E _X1 and E _X2 from the first and second distortion measurement units 14 and 15 by the correction coefficients α and β obtained as described above. The difference between the output voltages is obtained (E _X1 × α−E _X2 × β). The subtraction value obtained in this way is sent to the output terminal 27 as operation data DS.

  The output device 50 is connected to the output terminals 27 and 28. In step 20, the distortion is calculated based on the operation data DS and the Z direction data DA sent from the output terminals 27 and 28, and this is displayed on the display unit.

  By the above-described motion detection process, the motion of the finger A when the finger A is moved in the shearing direction (arrow X1, X2 direction) on the base 35 is applied to the first arm unit 12 and the second arm unit 13. An image is displayed on the output device 50 as the generated distortion.

  Next, a description will be given of experimental results of an experiment in which the finger A is operated on the base 35 using the motion detection device 20 configured as described above.

  6A to 6E show an experiment in which the finger A with the motion detection sensor 10 is moved in the shearing direction (arrow X1, X2 direction) on the base 35, and displayed on the output device 50 at that time. The output result is shown. In each figure, the vertical axis indicates the magnitude of the distortion, and the horizontal axis starts the operation of the finger A.

  FIG. 6A shows Z-direction data DA obtained by adding the output values from the first and second distortion measuring units 14 and 15 by the adding unit 25. In the figure, the period from time t1 to t2 is a period in which the finger A is pressed against the base 35 without moving (moving), and the period from time t2 to t3 is the period in which the finger A is moved in the arrow X1 direction. Further, the period from time t3 to t4 is a period in which the finger A is moved in the direction of the arrow X2.

  As shown in FIG. 6A, the Z-direction data DA obtained by adding the outputs from the first and second strain measurement units 14 and 15 becomes substantially the same output value during the period of time t1 to t4. Yes. From the Z-direction data DA, the total sum of distortions occurring in the first arm portion 12 and the second arm portion 13 is obtained. 6A shows that the total sum of the distortions generated in the first and second arm portions 12 and 13 is a constant value regardless of the moving direction of the finger A. FIG.

  However, since the output from the arithmetic unit 30 is constant between times t1 and t4 regardless of the direction of movement of the finger A, it is not possible to know the direction of movement of the finger A from the Z-direction data DA in FIG. Can not.

  FIGS. 6B and 6C show operation data DS obtained by calibrating the output values from the first and second strain measurement units 14 and 15 after being calibrated by the calculation unit 26. 6B and 6C, the value between the times t1 and t2 is the value of the operation data DS in a state where the finger A is pressed against the base 35 without moving.

  Further, the value between time t2 and t4 in FIG. 6B indicates the value of the operation data DS when the finger A is moved in the direction of the arrow X1 from this pressed state. Furthermore, the value between times t2 and t4 in FIG. 6C is the value of the operation data DS when the finger A is moved in the arrow X2 direction (the opposite direction to FIG. 6B) from the pressed state. Is shown.

  6B and 6C, the distortion generated between the times t1 and t2 is generated by pressing the finger A against the base 35. FIG. When the finger A is pressed against the base 35, the finger A is deformed (hereinafter referred to as non-operating deformation), and the first and second arm portions 12 and 13 are also deformed due to the non-operating deformation. To do.

  Distortion occurring between times t1 and t2 (hereinafter, this time is referred to as non-operation time) is due to the deformation during non-operation. If the finger A is moved in the direction of the arrow X1 or the direction of the arrow X2 on the base 35 at the time t2 after this non-operation time, the finger A is deformed along with this operation.

  As described above, the deformation generated in the finger A that is operating is a different deformation (asymmetric deformation) on the X1 direction side and the X2 direction side of the finger A. Therefore, the distortion generated in the first and second arm portions 12 and 13 deformed in response to the deformation of the finger A has different magnitudes in the first arm portion 12 and the second arm portion 13.

  As shown in FIG. 6B, the motion data DS changes to the plus side when the finger A is moved in the arrow X1 direction at time t2. On the other hand, as shown in FIG. 6C, the motion data DS changes to the negative side when the finger A is moved in the direction of the arrow X2 at time t2. Therefore, the movement direction of the finger A can be measured from the movement data DS output from the movement detection device 20.

  In FIG. 6D, after the non-operation time, the finger A is moved in the direction of the arrow X1 during the time t2 to t3, and then the finger A is moved in the direction of the arrow X2, which is the reverse direction, during the time t3 to t4. The value of the operation data DS at the time of being made is shown. As shown in the figure, the value of the motion data DS is inverted around the value of the motion data DS in the non-operation time at time t3 when the motion direction of the finger A is changed. Therefore, it can be seen from the result shown in FIG. 6D that the movement direction of the finger A can be measured from the movement data DS output from the movement detection device 20.

  FIG. 6E shows the value obtained by subtracting the value of the operation data DS shown in FIG. 6D by the distortion corresponding to the non-operation deformation. Thus, by performing correction processing on the motion data DS shown in FIG. 6D, the value of the motion data DS when the finger A is moved in the arrow X1 direction and the finger A is moved in the arrow X2 direction. The value of the operation data DS at this time is reversed in the plus direction and the minus direction with the origin as the center. Therefore, the movement direction of the finger A can be easily recognized by setting the output form from the motion detection device 20 to the form shown in FIG.

  As described above, according to the motion detection sensor 10 and the motion detection device 20 according to the present embodiment, the motion direction of the finger A can be checked from the motion data DS. In addition, the magnitude of the distortion occurring in the finger A can also be known from the operation data DS as the amount of change from the uniform distortion.

  Therefore, for example, when the practitioner uses a cosmetic tool or the like for the hand, the motion detection sensor 10 according to the present embodiment is attached to detect the motion (motion direction and strength) of the practitioner's finger during the treatment. can do. Therefore, the motion of the finger A when performing a treatment using the motion detection sensor 10 according to the present embodiment is measured, and the feeling felt on the fingertip at the time of the treatment is examined by a sensory test or the like. It is possible to quantitatively detect the feeling of use of the makeup tool or the like.

  Further, as described above, since the motion detection sensor 10 according to the present embodiment is small and light, the motion detection sensor 10 does not get in the way of the operation of the finger A, and thus the feeling of use is quantified. Detection can be performed with high accuracy.

  The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific embodiments described above, and various modifications can be made within the scope of the present invention described in the claims. It can be modified and changed.

  For example, in the above-described use example, the example in which the motion detection sensor 10 is used for motion detection at the time of cosmetic treatment is shown, but the application of the motion detection sensor 10 and the motion detection device 20 is not limited to this, It can be used in various technical fields.

  In the present embodiment, the base portion 11 and the arm portions 12 and 13 are both made of metal. However, the base portion 11 and the arm portions 12 and 13 are not necessarily limited to metal, such as resin. It is also possible to configure by.

DESCRIPTION OF SYMBOLS 10 Motion detection sensor 11 Base part 12 1st arm part 13 2nd arm part 14 1st strain measurement part 14a-14d 1st-4th strain gauge 15 2nd strain measurement part 15a-15d 1st-1st Fourth strain gauge 16 Acceleration sensor 17 Cover member 18, 19 Opening 20 Motion detection device 25 Addition unit 26 Calculation unit 30 Calculation device 40 Calibration plate 41 Detection stand 41
42 load cell 50 output device

Claims (3)

A motion detection sensor that is attached to a finger and detects the motion of the finger,
A base located at the top of the finger in a worn state;
A first arm extending from one side edge of the base to one side of the finger;
A second arm extending from the other side edge of the base to the other side of the finger and sandwiching the finger with the first arm;
First strain measuring means for measuring strain generated in the first arm when the finger is moved, as the finger is deformed;
Second strain measuring means for measuring strain generated in the second arm as the finger is moved when the finger is moved;
I have a,
The motion detection sensor according to claim 1, wherein the first arm and the second arm have an opening at a central position . The first strain measuring means is disposed on a first strain gauge and a second strain gauge disposed on an outer surface of the first arm, and on an inner surface of the first arm. A third strain gauge and a fourth strain gauge constituting the first Wheatstone bridge together with the first strain gauge and the second strain gauge;
The second strain measuring means is disposed on a fifth strain gauge and a sixth strain gauge disposed on an outer surface of the second arm, and on an inner surface of the second arm. The motion detection sensor according to claim 1, comprising a seventh strain gauge and an eighth strain gauge that constitute the second Wheatstone bridge together with the fifth strain gauge and the sixth strain gauge . The motion detection sensor according to claim 1 or 2 ,
The first measured value measured by the first strain measuring means and the second measured value measured by the second strain measuring means are calibrated and calibrated with the calibrated first measured value. A calculation unit for obtaining a finger movement from the second measurement value;
A motion detection apparatus comprising:

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