CN215841392U

CN215841392U - Gripping load detection device

Info

Publication number: CN215841392U
Application number: CN201990000862.0U
Authority: CN
Inventors: 安藤正道; 山川博雄; 森田畅谦
Original assignee: Murata Manufacturing Co Ltd
Current assignee: Murata Manufacturing Co Ltd
Priority date: 2019-01-25
Filing date: 2019-12-23
Publication date: 2022-02-18
Anticipated expiration: 2029-12-23
Also published as: JPWO2020153075A1; WO2020153075A1; JP6954483B2

Abstract

The present invention relates to a gripping load detection device (10, 20) comprising: a cylindrical housing (11, 61) for a user to hold; and a sensor (15, 63) which is attached to the housing (11, 61) and detects a load applied to the housing (11, 61) by the user's grip.

Description

Gripping load detection device

Technical Field

The present invention relates to a gripping load detection device that detects a load applied while a user is gripping.

Background

Patent document 1 discloses a hand-held isometric exercise device. The hand-held isometric exercise device disclosed in patent document 1 is configured such that a user applies a force to a surface of the device to push the device. The applied load is transferred to the load cell. Thus, the load cell detects the force applied by the user to the device.

Patent document 1: japanese laid-open patent publication No. 2009-95651

Generally, as a device for detecting a load, for example, there is a health apparatus for detecting a grip force of a user. Health appliances are used in, for example, training halls, homes, hospitals, or the like. Such health appliances are heavy and bulky, and thus are difficult to carry and transport. Therefore, a health appliance which can be easily carried and simply used is desired.

SUMMERY OF THE UTILITY MODEL

Therefore, an object of the present invention is to provide a gripping load detection device that can be easily carried and used simply.

The gripping load detection device of the present invention is characterized by comprising: a cylindrical housing for a user to hold; and a sensor attached to the housing and detecting a load applied to the housing by the user's grip.

The housing of the gripping load detector according to the present invention is cylindrical. Therefore, the user can easily grip the housing and can easily carry the housing. Further, the user can easily apply a load while gripping the cylindrical case. For example, a user can apply a load to the housing by a simple action of lightly holding or twisting the housing. The strongest load is a twisting motion in a state where the user forcibly grips both ends of the housing, respectively. Further, since the sensor is attached to the cylindrical housing, the load applied to the housing can be detected. Thus, the user can use the gripping load detection device according to the present invention with a simple operation.

According to the present invention, it can be easily carried and used.

Drawings

Fig. 1 (a) is a perspective view showing the structure of the gripping load detection device according to the first embodiment, and fig. 1 (B) is a cross-sectional view taken along line I-I of fig. 1 (a).

Fig. 2 (a) is a plan view of the sensor according to the first embodiment, which is developed in a planar shape, and fig. 2 (B) is a cross-sectional view taken along line II-II of fig. 2 (a).

Fig. 3 (a) and 3 (B) are diagrams showing the relationship between the uniaxial stretching direction of the polylactic acid film, the electric field direction, and the deformation of the polylactic acid film.

Fig. 4 (a) is a schematic view showing an example of a case where torsional deformation is applied to the gripping load detection device according to the first embodiment, and fig. 4 (B) is a schematic view showing a result of simulating stress generated when torsional deformation is applied to the gripping load detection device according to the first embodiment.

Fig. 5 (a) is a schematic diagram illustrating a combination with a charging stand as an application example of the gripping load detection device according to the first embodiment, and fig. 5 (B) is a schematic diagram illustrating the gripping load detection device according to the first embodiment during charging of the charging stand.

Fig. 6 (a) is a perspective view showing the structure of the gripping load detection device according to the second embodiment, and fig. 6 (B) is a cross-sectional view taken along line III-III of fig. 6 (a).

Description of the reference numerals

10. 20 … holding the load detection device; 11. 61 … a housing; 15. a 63 … sensor; 16 … display part; 21 … piezoelectric film; 65 … a gripping portion.

Detailed Description

Fig. 1 (a) is a perspective view showing the structure of the gripping load detection device 10 according to the first embodiment, and fig. 1 (B) is a cross-sectional view of the gripping load detection device 10 taken along the line I-I in fig. 1 (a). In fig. 1 (a), the sensor 15 is indicated by a broken line. In fig. 1 (a) and 1 (B), wiring and the like are omitted.

As shown in fig. 1 a and 1B, the gripping load detection device 10 includes a housing 11, a sensor 15, a display unit 16, a microcomputer (hereinafter referred to as a microcomputer) 17, and a sensor detection circuit 18. The housing 11 has a first end 12 and a second end 13. The housing 11 is cylindrical in shape. The housing 11 has an interior space 19 extending from the first end 12 to the second end 13. The first end portion 12 and the second end portion 13 of the housing 11 are open on the side. However, the first end portion 12 and the second end portion 13 side of the housing 11 may be closed.

The sensor 15 and the display unit 16 are disposed at the center portion in the axial direction of the housing 11. The gripping load detection device 10 has a center of gravity at a substantially central portion. Therefore, when the user grips the first end portion 12 side and the second end portion 13 side of the gripping load detection device 10 with both hands, the load is equally received by each hand.

The sensor 15 is sheet-like in shape. The sensor 15 is attached to the inside of the housing 11. The wiring of the sensor 15 is not visible from the outside of the housing 11. Therefore, the gripping load detection device 10 is of a simple design. In addition, the sensor 15 deforms in accordance with the deformation of the housing 11. The sensor 15 detects deformation of the housing 11 as described in detail below.

The sensor 15 may be attached to the outside of the housing 11. In this case, the sensor 15 is covered with a protective material such as a film made of resin. As a protective material for covering the sensor 15, for example, a film having light transmittance such as PET is preferable.

The display unit 16 is formed of a thin film display such as an organic EL or an inorganic EL. The display portion 16 is sheet-like in shape. The display portion 16 is deformable. The display unit 16 is disposed in the inner space 19 of the housing 11 in a rolled state. The display unit 16 is attached to the sensor 15, for example. The display unit 16 may be attached to the outside of the housing 11. When the sensor 15 is located inside the display unit 16, the sensor 15 may be opaque.

The microcomputer 17 and the sensor detection circuit 18 are disposed inside the display unit 16 in the internal space 19 of the housing 11. The microcomputer 17 and the sensor detection circuit 18 are covered with the display unit 16 and are not visible from the outside. Therefore, the gripping load detection device 10 has a simple appearance.

The gripping load detection device 10 includes a power supply not shown. The power supply is disposed inside the display unit 16 in the internal space 19 of the housing 11, similarly to the microcomputer 17. The power supply is connected to the microcomputer 17.

The microcomputer 17 may include a communication unit not shown. The communication unit is an interface for receiving input of a signal and outputting the signal. The communication unit functionally includes a receiving unit and a transmitting unit. The receiving portion receives information from the outside of the gripping load detection device 10. For example, the receiving unit receives information to be displayed on the display unit 16. The transmitting unit transmits information relating to the detection value of the sensor 15 to the outside of the gripping load detection device 10.

As described in detail below, the sensor detection circuit 18 detects the electric charge generated in the sensor 15 due to the deformation of the housing 11. The microcomputer 17 inputs the detection value of the sensor detection circuit 18. The microcomputer 17 displays an image corresponding to the detection value of the sensor detection circuit 18 on the display unit 16. The display unit 16 is not necessarily required.

The housing 11 is made of a translucent member. For example, the case 11 is made of a light-transmitting resin. As the resin having light transmittance, for example, a resin such as acrylic, polycarbonate, PET, polyvinyl chloride, or ABS is preferable. When the resin described above is used as the resin constituting the case 11, the case 11 having high transparency can be obtained at low cost. Further, an acrylic resin is more preferably used as the resin constituting the case 11. By using an acrylic resin as the resin constituting the housing 11, a tough housing 11 can be obtained, the durability of the housing 11 is improved, and the transparency of the housing 11 becomes high. If the housing 11 has high transparency, the appearance of the gripping load detection device 10 becomes beautiful. In addition, since the gripping load detection device 10 is easy to recognize stains, it can be cleaned in time. When the sensor 15 has translucency, the user can see the display portion 16 through the housing 11 and the sensor 15. Since the display unit 16 can be checked from the outside, it can be disposed inside the housing 11. When the display unit 16 is attached to the outside of the housing 11, the housing 11 may be opaque.

The housing 11 has two holding areas 14. The grip regions 14 are portions on the first end portion 12 side and the second end portion 13 side in the housing 11, respectively. The grip region 14 is a region not overlapping the display unit 16. Therefore, the display unit 16 is ensured to be visible when the user grips the grip region 14.

The housing 11 has a cylindrical shape such as a cylinder. Therefore, the user easily grips the housing 11 and can easily carry it. In addition, only components such as a power supply and a circuit are disposed inside the housing 11. The inside of the housing 11 is mostly hollow. Therefore, the gripping load detection device 10 is very light. For example, the user can carry the article in a bag or the like. Thus, the user can use the gripping load detection device 10 without being limited by time or place. The gripping load detection device 10 can be used as a health appliance that applies a load to the housing 11. For example, the user grips the grip region 14 of the gripping load detection device 10 and twists the housing 11. The user can use the gripping load detection device 10 in this way to perform, for example, muscular strength training.

The shape of the housing 11 is not limited to a cylinder, and may be, for example, an elliptical or polygonal cross-sectional shape. When the housing 11 is polygonal, the hand is less likely to slip than a cylinder. The case 11 may be treated to prevent slipping. For example, the housing 11 is knurled. This makes it easy for the user to stably hold the housing 11 and to apply a large load to the housing 11.

The sensor 15 detects a load applied to the housing 11 due to the user's grip. The detection method of the sensor 15 will be described in detail below.

Fig. 2 (a) is a plan view of the sensor 15 developed in a planar shape, and fig. 2 (B) is a cross-sectional view taken along line II-II of fig. 2 (a). Note that fig. 2 (B) is shown with an increased thickness for convenience of explanation. Fig. 3 (a) and 3 (B) are diagrams showing the relationship between the uniaxial stretching direction 900 of the polylactic acid film, the electric field direction, and the deformation of the polylactic acid film.

As shown in fig. 2 (a) and 2 (B), the sensor 15 has a piezoelectric film 21, a first electrode 22, and a second electrode 23. The piezoelectric film 21 has a first main surface 151 and a second main surface 152. The piezoelectric film 21 includes a first electrode 22 on the first main surface 151 side and a second electrode 23 on the second main surface 152 side.

As the first electrode 22 and the second electrode 23, it is preferable to use any of an inorganic electrode such as ITO, ZnO, silver nanowire, carbon nanotube, and graphene, and an organic electrode containing PEDOT (polythiophene), polyaniline, and the like as a main component. By using such a material, the first electrode 22 and the second electrode 23 can be transparent electrodes. The sensor 15 is not necessarily transparent, and materials such as silver, copper, and aluminum may be used. In this case, since the user cannot see the display unit 16 through the sensor 15, the sensor 15 is disposed inside the display unit 16. In a state where the sensor 15 is disposed inside the display unit 16, both the sensor 15 and the display unit 16 may be disposed inside or outside the housing 11. The sensor 15 may be located inside the housing 11, and the display unit 16 may be disposed outside the housing 11.

The piezoelectric film 21 is formed in a rectangular shape. The piezoelectric film 21 may be any film having piezoelectricity. The piezoelectric film 21 is formed of, for example, uniaxially stretched polylactic acid (PLA), and further L-shaped polylactic acid (PLLA).

In the present embodiment, the piezoelectric film 21 is formed of a uniaxially stretched L-shaped polylactic acid (PLLA). The piezoelectric film 21 is uniaxially stretched in a direction substantially along the axial direction of the case 11 when attached to the case 11 (see hollow arrows shown in fig. 4 a and 4B).

The uniaxial stretching direction of the piezoelectric film 21 is hereinafter referred to as a uniaxial stretching direction 900. The uniaxial stretching direction 900 preferably forms an angle of 0 ° or an angle of 90 ° with respect to the axial direction or the circumferential direction of the case 11 when attached to the case 11. However, the angle is not limited thereto, and may be designed to be an optimum angle in view of the characteristics or the use state of the piezoelectric film 21.

The uniaxial stretching direction 900 is not limited to exactly 0 ° with respect to the axial direction or the circumferential direction of the housing 11, and may be substantially 0 °. Substantially 0 ° means an angle including, for example, about 0 ° ± 10 °. These angles are appropriately determined according to the overall design such as the detection accuracy, based on the application of the gripping load detection device 10. The same applies to the case where the uniaxial stretching direction 900 forms an angle of 90 ° with respect to the axial direction or the circumferential direction of the housing 11. The uniaxial stretching direction 900 is not limited to an angle of substantially 0 ° or substantially 90 ° with respect to the axial direction or the circumferential direction of the housing 11, and any angle may be adopted by the present invention as long as deformation can be detected.

The PLLA is a chiral polymer, and the main chain has a helical structure. PLLA is uniaxially stretched and has piezoelectricity when molecularly oriented. Then, the uniaxially stretched PLLA is polarized by the flat film surface of the piezoelectric film 21 being deformed. In this case, the magnitude of polarization is uniquely determined by the amount of displacement by which the flat film surface is displaced in the direction orthogonal to the flat film surface by pressing. The piezoelectric constant of uniaxially stretched PLLA is a very high type among polymers.

As shown in fig. 3 (a), when the piezoelectric film 21 contracts in the direction of the first diagonal line 910A and extends in the direction of the second diagonal line 910B orthogonal to the first diagonal line 910A, an electric field is generated in the direction from the back side to the front side of the paper surface. That is, when the neutral surface in the thickness direction of the piezoelectric film 21 is defined as 0 potential, a negative potential is generated on the front side of the sheet. As shown in fig. 3 (B), the piezoelectric film 21 extends in the direction of the first diagonal line 910A and also generates charges when contracting in the direction of the second diagonal line 910B, but the polarity is opposite, and an electric field is generated in the direction from the front side to the back side of the paper surface. That is, the piezoelectric film 21 generates a positive potential on the front side of the paper.

Polylactic acid generates piezoelectricity in orientation treatment by stretched molecules, and thus polarization treatment as in other piezoelectric polymers such as PVDF or piezoelectric ceramics is not required. That is, the piezoelectricity of PLLA, which is not a ferroelectric, is not expressed by the polarization of ions as in a ferroelectric such as PVDF or PZT, but is derived from a helical structure which is a characteristic structure of a molecule. The uniaxially stretched PLLA has a piezoelectric constant of about 5pC/N to 30pC/N, and has a very high piezoelectric constant in a polymer. In general, PLLA produced in mass production has a piezoelectric constant of about 7pC/N to 10 pC/N. Even with such mass-produced PLLA, it is possible to detect a minute displacement of several hundreds nm or more and several μm or less with high sensitivity. The detection sensitivity also varies depending on the size of the polylactic acid used in the sensor, the method of application, and the performance of the amplifier.

Spontaneous polarization does not occur in PLLA, and ferroelectricity is not exhibited. Therefore, the pyroelectric property due to the other ferroelectric piezoelectric body does not occur. Therefore, the sensor using PLLA can accurately detect only displacement without generating a signal due to heat, and is therefore suitable for use with an object that a living body contacts. Further, a change in the piezoelectric constant of PVDF or the like is observed with time, and the piezoelectric constant may be significantly reduced in some cases, but the piezoelectric constant of PLLA is extremely stable with time. Therefore, the deformation of the piezoelectric film 21 can be detected with high sensitivity without being affected by the surrounding environment. By using the PLLA, the deformation conducted to the piezoelectric film 21 can be detected reliably and with high sensitivity. Therefore, the deformation applied to the housing 11 can be reliably detected.

The stretch ratio is preferably about 3 to 8 times. By performing heat treatment after stretching, crystallization of the polylactic acid extended chain crystal is promoted, and the piezoelectric constant is improved. In the case of biaxial stretching, the same effect as that of uniaxial stretching can be obtained by making the stretching ratios of the respective axes different. For example, when a certain direction is an X axis, 8 times stretching is performed in the direction, and 2 times stretching is performed in a Y axis direction orthogonal to the X axis, the same effect as that obtained when uniaxial stretching is performed approximately 4 times in the X axis direction can be obtained with respect to the piezoelectric constant. Since a film stretched uniaxially alone is likely to be cracked in the stretching axis direction, the strength can be increased slightly by performing biaxial stretching as described above.

The piezoelectric output constant of PLLA (piezoelectric g constant, g d/epsilon)^T) Is relatively large. Therefore, by using PLLA, the deformation of the piezoelectric film 21 can be detected with very high sensitivity.

However, the sensor 15 is not limited to a piezoelectric sensor using PLLA. The sensor 15 may also be a piezoelectric sensor using PVDF. The sensor 15 may also be a strain gauge sensor. The PVDF piezoelectric sensor or strain sensor may be configured to detect torsional deformation (deformation in an oblique direction) of the housing 11.

Next, the use of the gripping load detection device 10 and the detection by the sensor 15 will be described. Fig. 4 (a) is a schematic view showing an example of a case where torsional deformation is applied to the gripping load detection device 10, and fig. 4 (B) is a schematic view showing a result of simulating stress generated when torsional deformation is applied to the gripping load detection device 10. Fig. 4 (a) is a perspective view, and fig. 4 (B) is a side view.

First, the user grips the two grip regions 14 of the gripping load detection device 10 with their hands. Further, the user may grip the two grip regions 14 of the grip load detection device 10 with opposite hands. Alternatively, the user may grip one gripping region 14 of the gripping load detection device 10 with the front hand and grip the other with the reverse hand. Also, the user may hold the device with both hands so as to cover the openings of the first end portion 12 and the second end portion 13. The user uses different muscles of the arm according to the gripping method of the gripping load detection device 10. Thereby, the user is able to train different muscles of the arm. Alternatively, the user may grip one grip region 14 of the grip load detection device 10 with the thighs and fix the grip region, and grip the other grip region with both hands. In addition, the user can perform the cyclic training by changing the gripping method of the gripping load detection device 10.

As shown in fig. 4 (a) and 4 (B), the user applies torsional deformation to the housing 11 of the gripping load detection device 10. That is, the user applies a shearing force to the gripping load detection device 10. Thereby, the user applies a force in the direction indicated by the arrow F1 to the first end portion 12 side of the housing 11 and a force in the direction indicated by the arrow F2 to the second end portion 13 side of the housing 11.

At this time, the case 11 is deformed slightly to such an extent that the user cannot visually recognize it, for example, about 1 μm. A compressive stress S1 and a tensile stress S2 are generated in the case 11. The compressive stress S1 and the tensile stress S2 correspond to the magnitude of the torsional deformation applied by the user. The compressive stress S1 and the tensile stress S2 shown in fig. 4 (a) and 4 (B) are typically stresses, and similar stresses are also generated in the axial direction and the circumferential direction of the case 11.

The sensor 15 deforms together with the deformation of the housing 11. Thereby, the piezoelectric film 21 of the sensor 15 is deformed. The piezoelectric film 21 generates a compressive stress S1 and a tensile stress S2. The piezoelectric film 21 generates polarization whose magnitude is proportional to the compressive stress S1 and the tensile stress S2. Thereby, the sensor detection circuit 18 detects the electric charge moved for neutralizing the generated polarization. That is, the sensor 15 is capable of generating an electric charge corresponding to the magnitude of the torsional deformation applied by the user.

The uniaxial stretching direction 900 of the piezoelectric film 21 forms an angle of 0 ° with respect to the axial direction of the case 11. The compressive stress S1 and the tensile stress S2 each form an angle of substantially 45 ° with respect to the uniaxial tensile direction 900. Therefore, the piezoelectric film 21 can efficiently generate electric charges. Even when the uniaxial stretching direction 900 of the piezoelectric film 21 forms an angle of 90 ° with respect to the axial direction of the case 11, the compressive stress S1 and the tensile stress S2 form an angle of substantially 45 ° with respect to the uniaxial stretching direction 900, respectively. Therefore, even in this case, the piezoelectric film 21 can efficiently generate electric charges.

The sensor detection circuit 18 may further include an integration circuit. The sensor detection circuit 18 integrates the electric charges generated in the piezoelectric film 21 and calculates the electric charges as a voltage value. The microcomputer 17 calculates a voltage value detected by the sensor detection circuit 18 as a magnitude of deformation of the case 11, that is, a load applied to the case 11 by a user. In the case where the sensor detection circuit 18 does not include an integrating circuit, the detected charge amount becomes a value proportional to the speed of deformation of the case 11.

The microcomputer 17 displays the calculated load on the display unit 16. For example, as shown in fig. 1 (a), the display unit 16 graphically displays the load applied to the housing 11. Thereby, the display portion 16 can visually represent the load applied to the housing 11 to the user. The display unit 16 may visually display the load in various other ways as well as in a graph. For example, the display unit 16 displays the image so that the color changes according to the load. In this case, the display unit 16 displays green when the load is weak, changes from green to yellow by gradually increasing the intensity, and displays red when the load is very strong. The display unit 16 may display the load using numerals, characters, or symbols.

The display unit 16 may display an image in which the housing 11 is distorted as one display mode. For example, the display unit 16 may display an image obtained by twisting the case 11 in a spiral shape, an image obtained by twisting cloth, an image obtained by twisting a string like a rope, or the like, in accordance with the magnitude of the detected force. This gives the user an illusion as if a force is applied to the object displayed on the display unit 16. Therefore, the user feels the distortion of the housing 11, and thus can perform training while surely feeling the applied load. Further, since the user feels that a force is applied to the object displayed on the display unit 16, a larger load can be applied to the housing 11 than in the case where nothing is displayed on the display unit 16. The display unit 16 may display an image that is somewhat damaged in accordance with the force applied to the housing 11. For example, the microcomputer 17 displays a target object (for example, ice) damaged by the user and an indication to the user that the target object is damaged on the display portion 16. When the user twists the housing 11, the microcomputer 17 displays on the display unit 16 that the target object is broken due to the load applied to the housing 11 by the user. Thus, the user feels an illusion that the target object is actually destroyed. Therefore, by displaying an image on the display unit 16 so that the user naturally applies a force, the gripping load detection device 10 can guide the state of the load applied to the housing 11 by the user. In addition, the ease of destruction of the target object displayed on the display unit 16 can be changed according to the level of the user or the level of training.

The user can confirm the load applied to the housing 11 from the display portion 16. Therefore, the user can train while adjusting the load. Further, since the gripping load detection device 10 displays the load detected by the sensor detection circuit 18 to the user, training can be performed while the user is distracted. For example, even when the user performs isometric exercise requiring a predetermined load to be applied to the muscles for a certain period of time, the user can easily maintain a concentrated force.

The display unit 16 does not need to be incorporated in the gripping load detection device 10. For example, the image may be displayed on an information processing apparatus such as a smartphone carried by the user. In this case, when the user uses the gripping load detection device 10, the microcomputer 17 transmits information on the detection value of the sensor 15 to the smartphone. The smartphone displays information transmitted by holding the load detection device 10. Thus, the user can confirm the training status on the smartphone. In this case, the user does not need to hold the gripping load detection device 10 in front.

The gripping load detection device 10 may include a speaker instead of the display unit 16 in addition to the display unit 16. The speaker emits a sound corresponding to the detected magnitude of the load. In the case where the gripping load detection device 10 includes a speaker in addition to the display unit 16, the speaker may emit a sound linked to an image. In this case, the user is more likely to have the illusion of applying a force to the object displayed on the display unit 16. The speaker may emit a sound whose volume is changed or a sound whose height is changed according to the magnitude of the detected load. In the case of changing the height of the sound, the user can use the gripping load detection device 10 as a kind of musical instrument. For example, the user can play music by changing the way of the force according to the instruction displayed on the display unit 16. The user can perform muscle strength training with a game feeling while using the gripping load detection device 10.

The display unit 16 may display "fuel on" or "light!according to the load applied to the housing 11 by the user or the duration! "and so on. For example, the microcomputer 17 compares the detection value of the sensor detection circuit 18 with a predetermined threshold value stored in an internal memory (not shown) of the microcomputer 17. When the microcomputer 17 determines that the detection value is equal to or less than the predetermined threshold value, it displays "a little bit less than the predetermined threshold value" on the display unit 16. This allows the user to know that the load applied to the housing 11 is insufficient. Conversely, when the microcomputer 17 determines that the detection value is larger than the predetermined threshold value, it displays "OK" on the display unit 16. The user can know that the load applied to the housing 11 is sufficient. The display unit 16 may display the time required for the training of the user. The user can know the time required for training. In this way, the gripping load detection device 10 can assist training of the user.

The gripping load detecting device 10 may also communicate with a server. For example, the communication unit of the microcomputer 17 transmits information related to the detection value of the sensor 15 to a server managed by the provider who grips the load detection device 10. The provider of the gripping load detection device 10 is, for example, a gymnasium or a sales company that grips the load detection device 10.

The server receives information related to the detection values of the sensors 15. The server analyzes the received information. For example, the server calculates a training state (for example, a total amount of movement of a day, or a calorie consumption) of the user from the detection value of the sensor 15, and the like. The gym coach observes the training status of the user as a customer, creating a recommendation message. The server sends a coach created message to the holding load detecting device 10. The gripping load detecting device 10 receives a message from the server. That is, the gripping load detection device 10 receives information corresponding to the transmitted information. The display unit 16 displays a message received from the server. The user can be assisted by training by confirming the displayed message. In this way, the gripping load detection device 10 can assist training of the user by communicating with an external server or the like.

The information transmitted from the server may be a score or the like corresponding to the training state of the user. Further, the provider who holds the load detection device 10 may construct a system that provides a certain benefit to the user based on the score. The user facilitates training by confirming the score.

Further, the gripping load detection device 10 may be a device that detects shaking of a living body. The biological tremor is a physiological phenomenon and is a mechanical minute vibration of muscles. If the user comes into contact with the housing 11, the biological tremor is transmitted to the piezoelectric film 21.

When the microcomputer 17 detects the biological tremor, it determines that the user is in contact with the housing 11. The microcomputer 17 calculates the load only when the state of the biotremor is detected. Thus, the microcomputer 17 can reduce unnecessary power consumption.

The gripping load detection device 10 can be used as a health aid for lowering blood pressure, for example. In the case of hypertension, it is known that the effect of lowering blood pressure is obtained by repeating a gentle exercise such as holding a towel quietly.

For example, when the user applies a load equal to or greater than a predetermined load to the housing 11, the gripping load detection device 10 displays a warning on the display unit 16. The user can recognize that the load applied to the housing 11 is too strong, that is, the load is applied excessively, by observing the display unit 16. Therefore, the user can know an appropriate method of applying a light load and can perform exercise for lowering blood pressure.

Next, an application example of the gripping load detection device 10 will be described. Fig. 5 (a) is a schematic diagram illustrating a combination with the charging stand 51 as an application example of the gripping load detection device 10, and fig. 5 (B) is a schematic diagram showing the gripping load detection device 10 during charging of the charging stand 51.

As shown in fig. 5 (a) and 5 (B), the charging stand 51 is formed in a substantially cylindrical shape so as to insert the gripping load detection device 10. The charging stand 51 has a pin 55 connectable to the gripping load detection device 10. The gripping load detection device 10 includes a charging pin, not shown, inside the housing 11.

When the gripping load detection device 10 is inserted into the charging stand 51, the charging pin of the gripping load detection device 10 is electrically connected to the pin 55 of the charging stand 51. Further, the gripping load detection device 10 does not need to be directly connected to the charging stand 51. For example, the gripping load detection device 10 may be charged by a non-contact charging method using electromagnetic induction.

As shown in fig. 5 (B), the display unit 16 may display information during charging of the gripping load detection device 10. The display unit 16 may display, for example, the training status of the user on the day, the current score, and the like. This enables the user to grasp the training state and the like.

The display unit 16 may display information that is not related to the training state of the user. The display unit 16 can display information received by the communication unit of the microcomputer 17. The display unit 16 may display information such as images or videos selected by the user. The image or video shows, for example, news, advertisements, photos registered by the user, or notifications or instructions from a training hall or the like. Thus, the user can use the gripping load detection device 10 as an interior decoration or a monitor.

Fig. 6 (a) is a perspective view showing the structure of the gripping load detection device 20 according to the second embodiment, and fig. 6 (B) is a cross-sectional view taken along line III-III of fig. 6 (a). Fig. 6 (a) shows the grip portion 65 in a broken line and transparent form. In the description of the second embodiment, the same structure as that of the first embodiment will not be described.

The gripping load detection device 20 includes a housing 61 and a gripping portion 65. The grip 65 is disposed in the grip region 14 on the outer periphery of the housing 61. The housing 61 is formed such that the cross-sectional area of the central portion is smaller than that of the grip region 14. The grip region 14 of the grip load detection device 20 is formed to be thick and thin for the user to easily grip. Thereby, the user easily grips the gripping load detection device 20 and easily applies a force.

The grip 65 includes a sensor 63 and a protective film 64. The sensor 63 is attached to the outer periphery of the housing 61. Therefore, the sensor 63 is easily attached to and detached from the housing 61. In addition, a protective film 64 is laminated and adhered to the sensor 63 so as to cover the sensor 63.

The user grips the grip portion 65 when in use. The sensor 63 detects the load applied by the user via the protective film 64. The sensor 63 is covered by the user's hand by the user holding the grip portion 65. Therefore, the sensor 63 and the protective film 64 may not have light transmittance. Therefore, the material of the sensor 63 can be widely selected. The housing 61 may have a light-transmitting property in the central portion, and the grip region 14 may not have a light-transmitting property.

The grip 65 may be treated to prevent slipping. For example, the housing 61 may be directly knurled. Instead of the protective film 64, the sensor 63 may be dispersed with a hand glue used for a racket of tennis or badminton. This makes it easy for the user to stably hold the housing 61.

Finally, the description of the present embodiment is to be considered in all respects as illustrative and not restrictive. The scope of the present invention is indicated not by the above embodiments but by the claims. The scope of the present invention is intended to include meanings equivalent to the claims and all modifications within the scope.

Claims

1. A gripping load detection device is characterized by comprising:

a cylindrical housing for a user to hold;

a sensor attached to the housing and detecting a load applied to the housing by the user's grip; and

a display part visually displaying a load applied to the housing.

2. The gripping load detection device according to claim 1,

the sensor detects torsion relative to the housing.

3. The gripping load detection device according to claim 1 or 2,

the housing has a light-transmitting property.

4. The gripping load detection device according to claim 1 or 2,

the display unit displays an image corresponding to the deformation of the housing.

5. The gripping load detection device according to claim 4,

the display unit is disposed inside the housing.

6. The gripping load detection device according to claim 1 or 2,

the sensor has a piezoelectric film composed of polylactic acid.

7. The gripping load detection device according to claim 6,

the stretching direction of the piezoelectric film is arranged along the axial direction or the circumferential direction of the housing.

8. The gripping load detection device according to claim 1 or 2,

the sensor is disposed inside the housing.

9. The gripping load detection device according to claim 1 or 2,

further comprises a holding part arranged on the periphery of the shell,

the sensor is disposed at a position corresponding to the grip portion.

10. The gripping load detection device according to claim 1 or 2,

further provided with:

a transmission unit that transmits information relating to the detection value of the sensor to the outside; and

and a receiving unit for receiving information from outside.

11. The gripping load detection device according to claim 10, wherein the receiving unit receives a response with respect to the information transmitted by the transmitting unit.