JP2013108886A - Sensor unit and motion measurement system using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sensor unit which does not solve problems only by volume or material quality of a shock/vibration absorbers, but is provided with a structure easy to absorb shock or vibration, and a motion measurement system using the same.SOLUTION: The sensor unit attached to an object 1 to be measured has: a first buffering part 30 which includes an outside wall 32 fixed to the object 1 to be measured; a second buffering part 40 which is placed inside the outside wall 32 of the first buffering part 30 and softer than the first buffering part 30; and a sensor part 20 held inside the second buffering part 40.

Description

  The present invention relates to a sensor unit and a motion measurement system using the sensor unit.

  Conventionally, when a measuring device such as a motion sensor is attached to a measurement object such as an exercise device, an impact / vibration absorber is disposed between the measurement device and the measurement object. With the absorbent material, the impact and vibration received from the measurement object are attenuated, and accurate measurement is performed without being affected by the impact or vibration.

  In Patent Document 1, a cushioning material is attached to the outer surface of the outer package of the acceleration sensor to prevent the semiconductor sensor from being damaged by dropping during transportation. It is disclosed that the acceleration sensor can be attached to the vehicle body via a cushioning material.

  In Patent Document 2, the first member having high mechanical strength that supports the substrate of the acceleration sensor is provided with a buffer material in parallel with the connector portion. When the connector is connected to the main body, a cushioning material is interposed between the acceleration sensor and the main body.

  In Cited Document 3, the housing of the acceleration sensor is covered with an elastic cover having high shock absorption. In the cited document 4, a buffer material is interposed between the acceleration sensor and the substrate.

JP-A-1-302169 Japanese Patent Laid-Open No. 3-170065 Japanese Utility Model Publication No. 7-008775 Japanese Patent Laid-Open No. 9-145738

  Patent Documents 1 to 4 do not disclose a specific structure for attaching a sensor unit such as an acceleration sensor to an exercise apparatus.

  FIG. 1 illustrates a comparative example in which an impact / vibration absorbing material 3 is interposed as in Patent Documents 1 to 4 when the sensor unit 2 is attached to a mounting surface 1B of a grip end 1A of an exercise equipment such as a tennis racket 1. . When the movement of the tennis racket 1 is measured by the sensor unit 2, the shock / vibration absorption is performed as in the comparative example of FIG. 1 so that the impact / vibration generated when the ball is hit is not directly transmitted to the sensor unit 2. The material 3 can be interposed.

  Here, in order for the shock / vibration absorbing material 3 to absorb high impact / vibration at the time of impact, it is necessary to increase the volume of the shock / vibration absorbing material 3 or to change the material to easily absorb the shock / vibration. .

  However, for example, as shown in FIG. 2, when the volume of the shock / vibration absorbing material 3 is increased, the shock / vibration absorbing material 3 becomes heavier and the entire racket 1 becomes heavier, and the weight balance of the racket 1 is also changed. In order to hold the grip of the tennis racket 1, the protruding shock / vibration absorber 3 as shown in FIG.

  Further, if the material of the shock / vibration absorber 3 is made soft to easily absorb the shock / vibration, the sensor unit 2 itself will fluctuate as shown in FIG. 3, and the accurate movement of the tennis racket 1 cannot be measured.

  According to some aspects of the present invention, a sensor unit having a structure that easily absorbs shock and vibration, and a motion measurement system using the sensor unit, are not solved by only the volume and material of the shock / vibration absorber. Can be provided.

(1) One aspect of the present invention is a sensor unit attached to a measurement target object,
A first buffer portion including an outer wall, the outer wall being fixed to the object to be measured;
A second buffer portion disposed inside the outer wall of the first buffer portion and softer than the first buffer portion;
A sensor unit held in the second buffer unit;
It relates to a sensor unit having

  In one aspect of the present invention, the shock / vibration absorbing structure is a double structure, the outer side is a first buffer part having a hard outer wall, and the inner side of the outer wall of the first buffer part is a soft second buffer. As a part. The first buffer portion having a hard outer wall presses the second buffer portion on the inner side, whereby the second buffer portion is easily deformed and suppresses shock and vibration. The first buffer portion absorbs the shock / vibration that the second buffer portion has not completely absorbed.

  (2) In one mode of the present invention, it can further have a buffer layer interposed between the 2nd buffer part and the sensor part. In this case, the deformation for absorbing the shock / vibration of the second buffer portion can be absorbed by the buffer layer, so that the transmission of the shock / vibration to the sensor portion is further reduced.

  (3) In one aspect of the present invention, the buffer layer may be an air gap. The deformation of the second buffer portion can be absorbed by the air gap and transmitted to the sensor portion can be reduced.

  (4) In one aspect of the present invention, the buffer layer may be formed of a filler that is filled and solidified in a gap between the second buffer portion and the sensor portion. The deformation of the second buffer portion can be absorbed by the filler and reduced from being transmitted to the sensor portion. In addition, since the filler can be held in a hollow state without directly contacting the sensor portion with the second buffer portion, transmission of impact and vibration can be minimized.

  (5) In one aspect of the present invention, the sensor unit may include a substrate, and the second buffer unit may be divided into two buffer units with the substrate as a boundary. If it carries out like this, the assembly property which arrange | positions a sensor part in a 2nd buffer part will improve.

  (6) In one aspect of the present invention, the second buffer unit can hold the substrate between the two buffer units. In this way, the second buffer portion holds the substrate, whereby an air gap can be formed between the second buffer portion and the sensor portion, or the air gap can be filled with a filler.

  (7) In the aspect of the invention, the first buffer portion includes a facing wall on a surface opposite to a surface fixed to the measurement target object, and the sensor portion is a filling that forms the buffer layer. It can fix to the said opposing wall through a material. In this case, since the sensor unit is fixed to the opposing wall of the first buffer unit with the least deformation via the filler forming the buffer layer, the transmission of shock and vibration to the sensor unit can be reduced. it can.

  (8) The outer wall of the first buffer portion may have a slit penetrating in the thickness direction, and the second buffer portion may be disposed in the slit. If it carries out like this, the freedom degree which deform | transforms the 2nd buffer part in the direction which protrudes from a slit increases, and it becomes easy to deform | transform. Therefore, the shock / vibration absorption amount in the second buffer portion can be increased. In addition, the contact area between the first and second buffer portions is increased by the slit, and it becomes easy to transmit shock and vibration between the first and second buffer portions, and the shock and vibration absorption efficiency is increased.

  (9) In one aspect of the present invention, the specific gravity of the second buffer portion can be made smaller than the specific gravity of the first buffer portion. Even if the volume of the second buffer portion that absorbs more shock and vibration is increased, the increase in weight can be suppressed because the specific gravity is small. In addition, since the first buffer portion having the outer wall is hard and has a high specific gravity, fluctuation of the sensor portion is prevented.

  (10) Another aspect of the present invention defines an exercise device to which the above-described sensor unit is attached. In this exercise apparatus, for example, the first and second buffer portions absorb excessive shock / vibration that occurs due to, for example, hitting, so that it is possible to reduce the shock / vibration unnecessary for measurement.

It is a figure which shows the comparative example which fixed the sensor part to the grip end of the tennis racket through the impact / vibration absorbing material. It is a figure which shows the aspect which increased the volume of the shock and the vibrational absorption material in the comparative example shown in FIG. It is a figure which shows the aspect which made the material of the shock and the vibrational absorption material soft in the comparative example shown in FIG. It is sectional drawing which shows the sensor unit of 1st Embodiment of this invention. It is a figure which shows the transmission effect | action of an impact and vibration in 1st Embodiment of this invention. It is a figure which shows the transmission effect | action of the impact and vibration of the ball hit state in the comparative example shown in FIG. FIGS. 7A to 7C show measurement data of triaxial acceleration without a shock / vibration absorber, FIG. 7A shows a Z-axis component, FIG. 7B shows a Y-axis component, FIG. 7C shows X-axis components. 8 (A) to 8 (C) show measurement data of the triaxial acceleration of the comparative example shown in FIG. 1, FIG. 8 (A) shows the Z-axis component, FIG. 8 (B) shows the Y-axis component, FIG. 8C shows X-axis components. 9A to 9C show the measurement data of the triaxial acceleration according to the first embodiment of the present invention. FIG. 9A shows the Z-axis component, and FIG. 9B shows the Y-axis component. FIG. 9C shows the X-axis component. It is a characteristic view which shows angular velocity data including the time of the impact impact in 1st Embodiment of this invention. It is a characteristic view which shows angular velocity data including the time of the impact impact in a comparative example. It is sectional drawing of the sensor unit which concerns on 2nd Embodiment of this invention. It is sectional drawing of the sensor unit which concerns on 3rd Embodiment of this invention. It is a side view of the sensor unit shown in FIG.

    Embodiments of the present invention will be specifically described below with reference to the drawings.

1. First Embodiment FIG. 4 is a cross-sectional view showing a sensor unit according to a first embodiment of the present invention. In FIG. 4, the sensor unit 10 </ b> A includes a sensor unit 20, a first buffer unit 30, and a second buffer unit 40.

  The sensor unit 20 can be mounted with, for example, a triaxial acceleration sensor and a triaxial angular velocity sensor, a driving circuit thereof, and a signal processing circuit on the front and back surfaces of the substrate 22A. The motion measurement system including the sensor unit 20 includes, in addition to the sensor unit 20, an output device such as a display device or a printing device that outputs the movement of the measurement object based on a signal output from the sensor unit 20, and if necessary, the sensor unit. A processing circuit such as an arithmetic circuit that calculates the signal output from 20 to obtain an output result can be included. In the present embodiment, the maximum acceleration that can be measured by the sensor unit 20 is, for example, 50G.

  The first buffer portion 30 has an outer wall 32. The 1st buffer part 30 can have further the opposing wall 34 which opposes the attachment surface 1B of the tennis racket 1 of FIG. The first buffer 30 may be divided into an upper lid 30A and a lower lid 30B for convenience of assembly. In this case, the upper lid 30A has an outer wall 32A and an opposing wall 34, and the lower lid 30B has an outer wall 32B. The 1st buffer part 30 is formed with resin, for example. An end surface 32C of the outer wall 32 of the first buffer portion 30 is bonded and fixed to the mounting surface 1B of the tennis racket 1 by a double-sided tape or the like.

  The second buffer unit 40 is disposed inside the first buffer unit 30. The sensor unit 20 is held in the second buffer unit 40. The second buffer part 40 is formed of a softer material than the first buffer part 30. If the 1st buffer part 30 is resin, the 2nd buffer part 40 can be made from rubber, for example. The specific gravity of the second buffer 40 is smaller than that of the first buffer 30.

  In the first embodiment of the present invention, the shock / vibration absorbing structure is a double structure, the outer side is the first buffer part 30 having a hard outer wall 32, and the inner side of the outer wall 32 of the first buffer part 30 is The soft second buffer portion 40 is used. The first buffer portion 30 having the outer wall 32 having a harder outer side presses the second buffer portion 40 on the inner side, whereby the second buffer portion 40 is easily deformed, and impact and vibration can be suppressed. The 1st buffer part 30 can absorb the shock and vibration which the 2nd buffer part 40 did not absorb completely.

  Thus, the impact and vibration at the time of hitting the ball with the tennis racket 1 shown in FIG. 1 are absorbed by the first and second buffer parts 30 and 40 of the sensor unit 10A as shown in FIG. The portion 20 has a structure that is difficult to be transmitted.

  On the other hand, in the comparative example shown in FIGS. 1 to 3, the impact / vibration when the tennis racket 1 is struck is absorbed by the impact / vibration absorber 3 and is reduced as shown in FIG. 6. Since the sensor unit 2 exists on the way of the shock / vibration that was not absorbed by the shock / vibration absorber 3, excessive shock / vibration was directly transmitted to the sensor unit 2 in a so-called ball hitting state.

  In FIG. 4, the buffer layer 50 may be further interposed between the second buffer unit 40 and the sensor unit 20. In this case, the deformation of the second buffer part 40 can be absorbed by the buffer layer 50, so that the transmission of impact / vibration to the sensor part 20 is further reduced.

  The buffer layer 50 can be an air gap. The deformation of the second buffer unit 40 can be absorbed by the air gap 50 and transmitted to the sensor unit 20 can be reduced.

  Here, in FIG. 4, the 2nd buffer part 40 is divided | segmented into the upper cover 40A and the lower cover 40B for the convenience of assembly property. Moreover, the second buffer 40 is divided into an upper lid 40A and a lower lid 40B with the substrate 22A of the sensor unit 20 as a boundary. And the assembly property which arrange | positions the sensor part 20 in the 2nd buffer part 40 is improved.

  In particular, in FIG. 4, the second buffer 40 holds the substrate 22 </ b> A between the upper lid 40 </ b> A and the lower lid 40 </ b> B. Thus, the air gap 50 can be formed between the second buffer unit 40 and the sensor unit 20 by the second buffer unit 40 sandwiching the substrate 22A.

  FIG. 7A to FIG. 9C show data of impact / vibration test results. 7 (A) to 7 (C) show data obtained by attaching the sensor unit 2 to the attachment surface 1B of the tennis racket 1 shown in FIG. 1 via an attachment jig (without the shock / vibration absorber 3). . 8A to 8C show data measured by attaching the sensor unit 2 via the shock / vibration absorbing material 3 by the method of the comparative example shown in FIG. 9A to 9C are data measured by attaching the sensor unit 10A of the present embodiment shown in FIG. 4 to the attachment surface 1B of the tennis racket 1 shown in FIG.

  FIG. 7A to FIG. 9C are data obtained by measuring acceleration in three axes (X, Y, and Z axes) when the tennis racket 1 is dropped in the Z axis direction from the same height. FIGS. 7A, 8A, and 9A show the Z-axis acceleration, and FIGS. 7B, 8B, and 9B show the Y-axis acceleration, respectively. 7C, FIG. 8C, and FIG. 9C each show the X-axis acceleration. When comparing FIG. 7 (A) to FIG. 7 (C) and FIG. 8 (A) to FIG. 8 (C), in FIG. 8 (A), the time for receiving a strong impact in the Z-axis direction is shortened. This is considered to be the effect of inserting the shock / vibration absorbing material 3 of FIG. On the other hand, FIGS. 8B and 8C have larger changes in the X- and Y-axis directions than FIGS. 7B and 7C. This is presumably because the fluctuation of the sensor unit 2 itself is increased by inserting the shock / vibration absorbing material 3 of FIG.

  In that respect, in FIG. 9A, which is the measurement data of this embodiment, the time during which a strong impact in the Z-axis direction is applied is even shorter than that in FIG. 8A, and is shown in FIGS. As described above, it is possible to confirm a high effect such as shortening the time under the influence of shock and vibration including the X and Y axes.

  In the sensor unit 10A of the present embodiment, it was also confirmed that the influence of impact / vibration at the time of hitting the ball with the tennis racket 1 shown in FIG. 1 can be reduced. FIG. 10 shows angular velocity data about the three axes X, Y, and Z, and the angular velocity around each axis follows the attitude of the tennis racket 1 without being affected by the impact after the time T when the impact was received. Is measured.

  On the other hand, in the comparative example of FIG. 1, as shown in FIG. 11, for example, the angular velocity around the Y axis is measured as indicated by the arrow A, and the data of the arrow B that should be measured cannot be measured. It was.

2. Second Embodiment FIG. 12 shows a sensor unit 10B according to a second embodiment of the present invention. The sensor unit 10B shown in FIG. 12 is different from the sensor unit 10A shown in FIG. 4 in that the buffer layer 50 formed by the air gap of FIG.

  The filler 60 is filled in the gap between the second buffer part 40 and the sensor part 20 and solidified. As the filler 60, a potting material such as trade name TSE3051 (Tanak Corporation) or trade name 1230G (Three Bond) can be suitably used.

  As an advantage of using the filler 60, as shown in FIG. 4, the substrate 22A is held by the upper cover 40A and the lower cover 40B of the second buffer portion 40, but the substrate 22B of FIG. 12 need not be held. This is because the sensor part 20 can be held in the second buffer part 40 by the filler 60. In this case, the sensor unit 20 is not in direct contact with the second buffer unit 40, so that the deformation of the second buffer unit 40 is not transmitted to the sensor unit 20. Thereby, the fluctuation | variation of the sensor part 20 can be reduced.

  In addition, the sensor part 20 shown in FIG. 12 can be fixed to the opposing wall 34 of the 1st buffer part 30 via the filler 60 which forms a buffer layer. In this case, since the sensor unit 20 is fixed to the opposing wall 34 with the least deformation in the first buffer unit 30 via the filler 60 that forms the buffer layer, fluctuation of the sensor unit 20 can be reduced. it can.

3. 3rd Embodiment In 3rd Embodiment of this invention, as shown in FIG.13 and FIG.14, the outer side wall 32 of the 1st buffer part 30 has the slit 36 penetrated in thickness direction. The second buffer part 40 can be disposed in the slit 36 of the first buffer part 30. If it carries out like this, the freedom degree which deform | transforms the 2nd buffer part 40 in the direction which protrudes from the slit 36 increases, and it becomes easy to deform | transform. Therefore, the amount of shock / vibration absorption in the second buffer 40 can be increased. In addition, the contact area between the first and second buffer portions 30 and 40 is increased by the slit 36. For this reason, it becomes easy to transmit an impact and vibration between the 1st, 2nd buffer parts 30 and 40, especially between the inside 2nd buffer part 40 and the 1st buffer part 30 outside, and impact and vibration absorption efficiency are improved. Increase.

  In addition, this invention is not limited to the said embodiment, A various deformation | transformation implementation is possible within the range of the summary of this invention. For example, the slit 36 shown in FIGS. 13 and 14 may be provided in the sensor units 10A and 10B shown in FIGS. In addition, the specific gravity of the second buffer 40 that is softer than the first buffer 30 can generally be made smaller than the specific gravity of the first buffer 30. Thus, even if the volume of the second buffer portion 40 that absorbs more shock and vibration is increased, the increase in weight can be suppressed because the specific gravity is small. In addition, since the first buffer portion 30 including the outer wall 32 is hard and has a high specific gravity, fluctuation of the sensor portion 20 is prevented.

  4, 12, and 13, the second buffer portion 40 is not flush with the end surface 32 </ b> C (see FIG. 4) of the outer wall 32 of the first buffer portion 30, but directly with the mounting surface 1 </ b> B of the tennis racket 1. It is good also as a structure which does not contact. If it carries out like this, the impact and vibration from the tennis racket 1 will pass through the 1st buffer part 30, or the 2nd buffer layer (air gap) between the attachment surface 1B and the 2nd buffer part 40. Therefore, it can be set as the structure where the impact and vibration from the tennis racket 1 are not directly transmitted to the 2nd buffer part 40. FIG.

  In addition, the measurement object to which the sensor unit of the present invention is attached is particularly suitable for a sports equipment such as a tennis racket or a golf club used for hitting, but the measurement object such as movement and posture is measured by measuring acceleration and / or angular velocity. All other devices such as play devices can be widely used.

  10A, 10B, 10C sensor unit, 20 sensor part, 22A, 22B substrate, 30 first buffer part, 30A upper lid, 30B lower lid, 32, 32A, 32B outer side wall, 34 facing wall, 40 second buffer part, 40A upper lid , 40B Lower lid, 50 Buffer layer (air gap), 60 Buffer layer (filler)

Claims (10)

A sensor unit attached to a measurement object,
A first buffer portion including an outer wall, the outer wall being fixed to the object to be measured;
A second buffer portion disposed inside the outer wall of the first buffer portion and softer than the first buffer portion;
A sensor unit held in the second buffer unit;
A sensor unit comprising: In claim 1,
The sensor unit further comprising a buffer layer interposed between the second buffer unit and the sensor unit. In claim 2,
The sensor unit, wherein the buffer layer is an air gap. In claim 2,
The sensor unit, wherein the buffer layer is formed of a filler that is filled and solidified in a gap between the second buffer portion and the sensor portion. In any one of Claims 1 thru | or 4,
The sensor unit has a substrate,
The sensor unit, wherein the second buffer part is divided into two buffer parts with the substrate as a boundary. In claim 5,
The sensor unit, wherein the second buffer unit holds the substrate between the two buffer units. In claim 4,
The first buffer portion includes an opposing wall on a surface opposite to a surface fixed to the measurement target object,
The sensor unit is fixed to the opposing wall through a filler forming the buffer layer. In any one of Claims 1 thru | or 7,
The outer wall of the first buffer portion has a slit penetrating in the thickness direction,
The sensor unit, wherein the second buffer portion is disposed in the slit. The sensor unit according to claim 1, wherein a specific gravity of the second buffer portion is smaller than a specific gravity of the first buffer portion.   10. A motion measurement system, wherein the sensor unit according to claim 1 is attached.

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