JP6734588B2 - Load measuring shoes - Google Patents

Description

The present invention relates to a load measuring shoe having a load sensor section provided on an inner sole.

2. Description of the Related Art Conventionally, a load measuring shoe having a load sensor section provided on an inner sole is known. This load measuring shoe can measure the load applied to the lower limbs while walking freely. Therefore, it is useful for rehabilitation of the lower limbs where the load applied to the sole is gradually increased. Some load sensor parts of load measuring shoes electrically detect a change in electrostatic capacitance due to a load.

For example, in Patent Document 1, the capacitance is changed in accordance with a partial load applied to each part of the sole (the rear foot portion, the left front foot portion, the right front foot portion), which is formed in the shape of a shoe pavement. A walking factor analysis device including a load measuring shoe provided with a plurality of variable capacitance type pressure sensors (load sensor units) is disclosed. The capacitance change of the variable capacitor of the variable pressure sensor is detected as a change in pulse oscillation frequency. This gait factor analysis device can measure the partial load of each part and perform a strict analysis of the walking state.

Further, in Patent Document 2, there is provided a load measurement unit (load sensor unit) which is formed in conformity with the contour shape of the back surface of the wearer's foot and detects capacitances at a plurality of positions on the back surface of the foot that change due to weight movement. A center-of-gravity position detecting device having a load measuring shoe portion provided is disclosed. Time until one of the upper electrode and the lower electrode forming the capacitance is connected to GND and the other is connected to a constant voltage power source until the voltage value between the upper electrode and the lower electrode reaches a predetermined value. Calculate the capacitance from This center-of-gravity position detection device can detect movement of the center-of-gravity position.

Further, in Patent Document 3, a sheet-shaped dielectric elastic body provided with a large number of voids or depressions (concave portions) periodically (at predetermined intervals), and a flat sheet-shaped dielectric elastic body made of the same material as that. A load sensor comprising a dielectric body, these sheet-shaped dielectric elastic bodies sandwiched by three sheet-shaped conductive elastic bodies in a sandwich shape, and two capacitors formed by using these three sheet-shaped conductive elastic bodies as electrodes. A load measuring device including a load measuring shoe having a section is disclosed. This load measuring device detects the total amount of load distributed to the load sensor section, and differentially detects the change in electrostatic capacitance due to the load of the two capacitors, so it can handle environmental changes such as noise and temperature. It is stable and stable, and can perform highly accurate measurement as compared with those described in Patent Documents 1 and 2.

JP-A-02-55045 International publication WO2009/084387 JP, 2008-107231, A

However, since the load sensor unit of the load measuring shoe receives the load applied to the lower limb during free walking, it may deteriorate with time. In the conventional load measuring shoes including Patent Documents 1 to 3, no special measures have been taken to deal with such deterioration of the load sensor unit with time.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a load measuring shoe capable of easily responding to replacement of the load sensor unit when the load sensor unit is deteriorated with time. ..

In order to achieve the above object, the load measuring shoe according to claim 1 is provided with a central recessed portion which is recessed in a central portion, and a fitting recessed portion which is open upwardly around the central recessed portion. A main body and a fitting convex portion that has a planar shape that is proportionally reduced from the contour line of the shoe main body and that protrudes downward from the lower surface and that can be fitted into the fitting concave portion are formed along the planar shape. A first sheet-shaped dielectric elastic body having a plurality of voids or recesses periodically provided therein, a flat second sheet-shaped dielectric elastic body, A first sheet-shaped conductive elastic body, a plurality of second sheet-shaped conductive elastic bodies, and a third sheet-shaped conductive elastic body, wherein the first sheet-shaped dielectric elastic body is the first sheet-shaped conductive elastic body. Between the plurality of second sheet-like conductive elastic bodies and the plurality of second sheet-like conductive elastic bodies, the second sheet-like dielectric elastic body is disposed between the plurality of second sheet-like conductive elastic bodies. Disposed between the body and the third sheet-shaped conductive elastic body, the first sheet-shaped conductive elastic body, the plurality of second sheet-shaped conductive elastic bodies, and the third sheet-shaped conductive body. Forming a plurality of capacitors using the elastic elastic body as an electrode, and a load sensor section installed in the central recess of the shoe main body below the inner bottom of the shoe, and the first sheet. AC output circuit for applying an AC voltage to the terminals of the sheet-shaped conductive elastic body, a second AC output circuit for applying an AC voltage to the terminals of the third sheet-shaped conductive elastic body, and a plurality of the plurality of 2. An electric circuit section having a current measuring circuit for measuring each alternating current flowing through the terminals of the sheet-shaped conductive elastic body and converting each alternating current into each load measuring voltage.

According to the load measuring shoe of the present invention, when the load sensor unit is deteriorated with time, it can be easily replaced or the like.

It is a top view showing appearance of both load measuring shoes on either side concerning an embodiment of the present invention. The shoe main body part of one of the load measuring shoes same as the above is shown, (a) is a plan view, (b) is a sectional view of a section of the section taken along the line AA, and (c) is (b). FIG. 7 is an end view of an enlarged cut portion near the upper right end of FIG. FIG. 2A is a plan view of one of the load measuring shoes of the same as above, where (a) is a plan view, (b) is an end view of a section taken along the line BB, and (c) is (b). FIG. 7 is an end view of an enlarged cutting portion near the right end of FIG. It is a sectional view showing the position of the load sensor part of one load measuring shoe same as the above, (a) is an expanded sectional view near the upper right end of (a). It is a top view which shows the upper 2 layers which comprise the load sensor part of one load measuring shoe same as the above, (a) is the 1st sheet-like conductive elastic body of the uppermost layer, (b) is the 2nd from the top. Is a first sheet-shaped dielectric elastic body of the layer. It is a top view which shows the center layer and the lower two layers which comprise the load sensor part of one load measuring shoe same as the above, (a) is a plurality of 2nd sheet-like conductive elasticity of a center layer. A second sheet-shaped dielectric elastic body of the fourth layer from the top, and (c) a third sheet-shaped conductive elastic body of the fifth layer from the top. It is a block circuit diagram which shows the circuit structure of one load measuring shoe same as the above. Fig. 2 schematically shows a detailed structure of a load sensor section of one load measuring shoe of the same as above, (a) is an enlarged sectional view and (b) is an enlarged plan view of a first sheet-shaped dielectric elastic body. .. It is a top view which shows the four conductive layers which comprise the load sensor board|substrate body of the load sensor part of one load measuring shoe same as the above with the outline of a load sensor board body, (a) is a top layer, (b) Is the second layer from the top, (c) is the third layer from the top, and (d) is the bottom layer. It is a top view which shows the external appearance of the load display apparatus used with the load measuring shoes same as the above.

Hereinafter, modes for carrying out the present invention will be described. The load measuring shoe 1 according to the embodiment of the present invention includes a shoe main body portion 2, a shoe inner sole portion 3, a load sensor portion 4, and an electric circuit portion 5. As shown in FIG. 1, the load measuring shoe 1 has an inner bottom portion 3 of the shoe body 2 fitted in the inner bottom portion of the shoe body portion 2 as shown in FIG. Can be attached.

The shoe main body 2 has the specifications of a normal shoe for the user of the load measuring shoe 1 except for the inner sole portion. The shoe main body 2 can have various specifications, that is, a shape and a material (for example, synthetic rubber or synthetic resin) or the like, like a normal shoe. As shown in FIGS. 2(a) to 2(c), the shoe main body 2 has a central recessed portion 2a which is recessed in the central portion in order to install a load sensor portion 4 described later. Further, the shoe main body 2 is formed with a fitting recess 2b which is opened upward for fitting a shoe inner sole 3 described later continuously around the entire circumference of the central recess 2a. In addition, recesses (hexagonal recesses in FIG. 2A) 2c are formed in places at the bottom of the central recess 2a for the purpose of improving the movement of the shoe body 2. 2(a) to 2(c), a belt for pressing the instep, a belt for pressing the toes, a belt for pressing the heel and the like in the shoe body 2 are omitted.

As shown in FIG. 3( a ), the shoe inner sole portion 3 is thin, and has a planar shape in which the contour line (contour line in plan view) of the shoe body portion 2 is slightly reduced in proportion. As shown in FIGS. 3(b) and 3(c), the shoe inner sole 3 has a fitting protrusion 3a protruding downward from the lower surface along the plane shape (outline of the shoe inner sole 3). It is formed slightly inside. The fitting convex portion 3a can be fitted into the fitting concave portion 2b of the shoe main body portion 2, so that the shoe inner bottom portion 3 can be attached to and detached from the shoe main body portion 2. The shoe inner bottom portion 3 can be made of the same material as the shoe main body portion 2. A large number of convex portions (circular convex portions in FIG. 3A) are formed on the upper surface of the inner bottom portion 3 of the shoe for the purpose of preventing the user's sole from slipping.

The load sensor portion 4 is installed in the central recess portion 2a of the shoe body portion 2 and at a position below the shoe inner bottom portion 3 in a state where the shoe body portion 2 is mounted (see FIG. 4). The load sensor unit 4 receives a load from the sole of the user via the shoe inner sole 3. The load sensor unit 4 is usually installed so that the upper surface thereof contacts the inner shoe sole unit 3. Further, the load sensor unit 4 is installed so as not to move, for example, by providing a cushioning material (not shown) around the outer peripheral surface thereof. Further, the load sensor unit 4 is preferably provided with a cushioning material (not shown) below the load sensor unit 4 in order to adjust the position in the vertical direction.

As shown in FIGS. 5A(a) to 5B(c), the load sensor unit 4 includes a first sheet-shaped dielectric elastic body 41 (see FIG. 5A(b)) and a second sheet-shaped dielectric elastic body. 42 (see FIG. 5B(b)), a first sheet-shaped conductive elastic body 43 (see FIG. 5A(a)) and a plurality (for example, 4 (for thumb side front part, little finger side front part, thumb side) The second sheet-shaped conductive elastic bodies 44a, 44b, 44c, 44d (see FIG. 5B(a)) and the third sheet-shaped conductive elastic body 45 (FIG. 5B(c) The first sheet-shaped dielectric elastic body 41 includes a first sheet-shaped conductive elastic body 43 and a plurality of second sheet-shaped conductive elastic bodies 44a to 44d. The second sheet-shaped dielectric elastic body 42 is arranged between the second sheet-shaped conductive elastic bodies 44a to 44d and the third sheet-shaped conductive elastic body 45. The first sheet-shaped dielectric elastic body 41 and the second sheet-shaped dielectric elastic body 42 have a thickness of, for example, about 6 mm when no load is applied. The thickness of the first sheet-shaped conductive elastic body 43, the plurality of second sheet-shaped conductive elastic bodies 44a to 44d, and the third sheet-shaped conductive elastic body 45 is For example, it can be about 1 mm.

The load sensor unit 4 uses the first sheet-shaped dielectric elastic body 41 and the second sheet-shaped dielectric elastic body 42 as dielectrics, and uses the first sheet-shaped conductive elastic body 43 and a plurality of second sheet-shaped conductive elastic bodies 43. Using the sheet-shaped conductive elastic bodies 44a to 44d and the third sheet-shaped conductive elastic body 45 as electrodes, as shown in FIG. 6, a plurality of capacitors (a plurality of first capacitors Ca ₁ , Cb ₁ , Cc ₁ and Cd ₁ and a plurality of second capacitors Ca ₂ , Cb ₂ , Cc ₂ and Cd ₂ ) are formed.

That is, the first sheet-shaped conductive elastic body 43 and the second sheet-shaped conductive elastic body 44a sandwich the first sheet-shaped dielectric elastic body 41 in a sandwich shape to form the first capacitor Ca ₁ . The second capacitor Ca ₂ is formed by sandwiching the second sheet-shaped dielectric elastic body 42 between the second sheet-shaped conductive elastic body 44 a and the third sheet-shaped conductive elastic body 45. And the first capacitor Ca ₁ and the second capacitor Ca ₂ serve as the partial load sensor 4a. The first sheet-shaped conductive elastic body 43 and the second sheet-shaped conductive elastic body 44b sandwich the first sheet-shaped dielectric elastic body 41 in a sandwich form to form the first capacitor Cb _1. , A portion in which the second sheet-shaped dielectric elastic body 42 is sandwiched between the second sheet-shaped conductive elastic body 44b and the third sheet-shaped conductive elastic body 45 forms the second capacitor Cb ₂ . Then, the first capacitor Cb ₁ and the second capacitor Cb ₂ become the partial load sensor 4b. A portion of the first sheet-shaped conductive elastic body 43 and the second sheet-shaped conductive elastic body 44c sandwiching the first sheet-shaped dielectric elastic body 41 in a sandwich form the first capacitor Cc _1. , A portion in which the second sheet-shaped dielectric elastic body 42 is sandwiched between the second sheet-shaped conductive elastic body 44c and the third sheet-shaped conductive elastic body 45 forms the second capacitor Cc ₂ . Then, the first capacitor Cc ₁ and the second capacitor Cc ₂ become the partial load sensor 4c. A portion of the first sheet-shaped dielectric elastic body 41 sandwiched between the first sheet-shaped conductive elastic body 43 and the second sheet-shaped conductive elastic body 44d forms the first capacitor Cd _1. , A portion in which the second sheet-shaped dielectric elastic body 42 is sandwiched between the second sheet-shaped conductive elastic body 44d and the third sheet-shaped conductive elastic body 45 forms the second capacitor Cd ₂ . Then, the first capacitor Cd ₁ and the second capacitor Cd ₂ become the partial load sensor 4d. Each of the partial load sensors 4a to 4d detects a load (partial load) over a portion defined by each of the second sheet-shaped conductive elastic bodies 44a to 44d.

Further, as shown in FIGS. 7A and 7B, the first sheet-shaped dielectric elastic body 41 is assumed to be provided with a large number of voids or depressions (concavities) 41s periodically (at predetermined intervals). The second sheet-shaped dielectric elastic body 42 is made of the same material as that of the first sheet-shaped dielectric elastic body 41 and is flat (that is, a large number of voids or recesses are not provided periodically). Since the first sheet-shaped dielectric elastic body 41 is provided with a large number of voids or recesses 41s periodically (at predetermined intervals), when a load is applied, a volume commensurate with the decrease in thickness is present in this portion. As it spreads, the thickness changes almost in proportion to the load. On the other hand, the second sheet-shaped dielectric elastic body 42 has a negligibly small change in thickness with respect to the load. Reference numeral 46 in FIG. 7A is a load sensor substrate body, which will be described in detail later.

Therefore, the capacitance values of the plurality of _first capacitors Ca _{1 to} Cd ₁ and the plurality of second capacitors Ca _{2 to} Cd ₂ can be expressed by the following formulas, respectively.
Ca ₁ =ε ₁ ·(Sa/da ₁ ) Ca ₂ =ε ₂ ·(Sa/d ₂ ).
Cb ₁ =ε ₁ ·(Sb/db ₁ ) Cb ₂ =ε ₂ ·(Sb/d ₂ )
Cc ₁ =ε ₁ ·(Sc/dc ₁ ) Cc ₂ =ε ₂ ·(Sc/d ₂ )
Cd ₁ =ε ₁ ·(Sd/dd ₁ ) Cd ₂ =ε ₂ ·(Sd/d ₂ )
Here, the dielectric constants of the first sheet-shaped dielectric elastic body 41 and the second sheet-shaped dielectric elastic body 42 are ε ₁ and ε ₂ , respectively, and a plurality of second sheet-shaped conductive elastic bodies 44a to The area of 44d is Sa, Sb, Sc, Sd, and the thickness (average thickness) of the first sheet-shaped dielectric elastic body 41 in the plurality of second sheet-shaped conductive elastic bodies 44a to 44d, respectively. They are da ₁ , db ₁ , dc ₁ , and dd ₁ . Assuming that the thickness of the second sheet-shaped dielectric elastic body 42 does not change due to the load, the thickness of the second sheet-shaped dielectric elastic body 42 in the plurality of second sheet-shaped conductive elastic bodies 44a to 44d. Are all d ₂ .

The first sheet-shaped dielectric elastic body 41 and the second sheet-shaped dielectric elastic body 42 are, for example, insulating silicon rubber, a first sheet-shaped conductive elastic body 43, and a plurality of second sheet-shaped conductive elastic bodies 43. For the conductive elastic bodies 44a to 44d and the third sheet-shaped conductive elastic body 45, conductive silicon rubber or the like can be used. Further, between the first sheet-shaped conductive elastic body 43 and the first sheet-shaped dielectric elastic body 41, between the first sheet-shaped dielectric elastic body 41 and the plurality of second sheet-shaped conductive elastic bodies 44a to 44d. Between the plurality of second sheet-shaped conductive elastic bodies 44a to 44d and the second sheet-shaped dielectric elastic body 42, between the second sheet-shaped dielectric elastic body 42 and the third sheet-shaped conductivity. The elastic bodies 45 can be bonded to each other using, for example, a thin adhesive.

The first sheet-shaped conductive elastic body 43 has a terminal 43t, the plurality of second sheet-shaped conductive elastic bodies 44a to 44d have terminals 44at, 44bt, 44ct, 44dt, and a third sheet-shaped conductive elastic body. Terminals 45t and 45t are provided on each of the terminals 45 (see FIG. 6), and an electric signal (voltage or current) is exchanged between the load sensor unit 4 and an electric circuit unit 5 described later through these terminals.

The terminal 43t of the first sheet-shaped conductive elastic body 43, the terminals 44at, 44bt, 44ct, 44dt of the plurality of second sheet-shaped conductive elastic bodies 44a to 44d, and the third sheet-shaped conductive elastic body 45. The terminal 45t can be provided on the load sensor substrate 46 provided below the third sheet-shaped conductive elastic body 45. The load sensor substrate body 46 can have the same shape as the third sheet-shaped conductive elastic body 45 and the like. Further, the load sensor substrate body 46 can be bonded to the third sheet-shaped conductive elastic body 45 by using, for example, a thin adhesive.

As shown in FIGS. 8A to 8D, printed wiring patterns 43p, 44ap to 44dp, 45p connected to the terminal 43t, the terminals 44at to 44dt, and the terminal 45t are formed on the load sensor substrate 46. Has been done. The first sheet-shaped conductive elastic body 43 and the plurality of second sheet-shaped conductive elastic bodies 44a to 44d are partially arranged directly below each through a lead wire (not shown) extending in a substantially vertical direction. The printed wiring patterns 43p and 44ap to 44dp thus formed can be connected (aerial wiring). The third sheet-shaped conductive elastic body 45 can be directly connected to the printed wiring pattern 45p, a part of which is arranged immediately below. The terminals 43t, the terminals 44at to 44dt, and the terminal 45t are all concentrated in one place, and are easily connected to the wiring cable connected to the electric circuit unit 5 . The load sensor board body 46 shown in FIGS. 8A to 8D is a multilayer wiring board, and the printed wiring patterns 43p, 44ap to 44dp, 45p are electrically connected and wired in each layer. .. Further, the wiring cable connected to the electric circuit section 5 has a connector and can be easily connected to the terminals 43t, the terminals 44at to 44dt, and the terminal 45t (or can be easily removed when the load sensor section 4 is replaced). Preferably.

Further, the load sensor unit 4 including the load sensor substrate 46 may be entirely housed in a thin cloth or the like. This facilitates the storage of the spare (replacement) load sensor unit 4.

Next, the electric circuit section 5 will be described. As described above, the electric circuit unit 5 can be attached to a belt or the like that presses the instep of the shoe body 2. In this case, a board or the like on which electronic components for realizing the electric circuit of the electric circuit section 5 are mounted is housed in the electric circuit section housing 5a, and the electric circuit section is mounted by a mounting mechanism 5b such as a mounting band shown in FIG. The container 5a is attached to the shoe body 2. The electric circuit unit 5 may be installed inside the shoe main body 2 and below the load sensor unit 4 in some cases.

As shown in FIG. 6, the electric circuit unit 5 applies an AC voltage V ₁ to the terminal 43t of the first sheet-shaped conductive elastic body 43 to apply an AC current to the plurality of first capacitors Ca _{1 to} Cd _1. AC voltage V ₂ is applied to the first AC output circuit 51 for flowing Ia ₁ , Ib ₁ , Ic ₁ , and Id ₁ and the terminal 45t of the third sheet-shaped conductive elastic body 45, and a plurality of second AC output circuits 51 are applied. a second AC output circuit 52 to flow a capacitor _Ca 2 ～Cd ₂ into AC current _{Ia 2, Ib 2, Ic 2} , Id 2, flows through the terminal 44at~44dt the second sheet-like conductive elastic body 44a~44d has an alternating current _{Ia 3, Ib 3, Ic 3} , Id 3 the measured voltage (load measuring voltage Va, Vb, Vc, Vd) plurality of current measurement circuit 53a for converting a, 53b, 53c, and 53d, the ing. The load measurement voltages Va to Vd are voltages according to the load distribution (partial load). In the present embodiment, the AC voltage V ₁ applied to the terminal 43t of the first sheet-shaped conductive elastic body 43 and the AC voltage V ₂ applied to the terminal 45t of the third sheet-shaped conductive elastic body 45 are The ground potential is set as a reference potential, and the terminals 44at to 44dt of the plurality of second sheet-shaped conductive elastic bodies 44a to 44d are set to be held at the same potential as the ground potential.

The first AC output circuit 51 and the second AC output circuit 52 have a phase difference of 180 degrees between the AC currents Ia _{1 to} Id ₁ and the AC currents Ia _{2 to} Id ₂ when no load is applied to the load sensor unit 4. The AC voltage V ₁ and the AC voltage V ₂ are adjusted (offset zero adjustment) so that the amplitudes become equal. Then, the AC currents Ia _{1 to} Id ₁ flowing through the plurality of first capacitors Ca _{1 to} Cd ₁ flow as AC currents Ia _{2 to} Id ₂ through the plurality of second capacitors Ca _{2 to} Cd ₂ . , a second terminal 44at~44dt sheet conductive elastic body 44, i.e. a plurality of current measuring circuit 53a~53d the alternating current _{Ia 3 ~Id} 3 does not flow.

Offset zero adjustment can be performed as follows. When no load is applied to the load sensor unit 2, Ca ₁ =ε ₁ ·(Sa/d ₁ ), Cb ₁ =ε ₁ ·(Sb/d ₁ ), Cc ₁ =ε ₁ ·(Sc/d _{1 ).} ), Cd ₁ =ε ₁ ·(Sd/d ₁ ). Here, the thickness of the first sheet-shaped dielectric elastic body 41 is d ₁ . Therefore, Ca ₁ /Ca ₂ =Cb ₁ /Cb ₂ =Cc ₁ /Cc ₂ =Cd ₁ /Cd ₂ =(ε ₁ ·d ₂ )/(ε ₂ ·d ₁ ) and a plurality of second sheets The capacitance ratios of the capacitors of the first sheet-shaped dielectric elastic body 41 and the capacitors of the second sheet-shaped dielectric elastic body 42 in the sheet-shaped conductive elastic bodies 44a to 44d are all constant.

Here, if the voltage ratio between the AC voltage V ₂ and the AC voltage V ₁ is set to V ₂ /V ₁ =(ε ₁ ·d ₂ )/(ε ₂ ·d ₁ ), the ratio of alternating current Ia ₁ /Ia ₂ , Ib ₁ /Ib ₂ , Ic ₁ /Ic ₂ and Id ₁ /Id ₂ are respectively V ₁ ·Ca ₁ /V ₂ ·Ca ₂ , V ₁ ·Cb ₁ /V ₂ ·Cb ₂ and V ₁ ·Cc. _{Since 1} /V ₂ ·Cc ₂ and V ₁ ·Cd ₁ /V ₂ ·Cd ₂ , all are 1 respectively. Therefore, the alternating current _Ia 1 ～Id ₁ flowing in the first capacitor _Ca 1 ～Cd ₁ a plurality flows to the capacitor _Ca 2 ～Cd ₂ of the plurality of second as alternating current _Ia 2 ～Id _2, second AC currents Ia _{3 to} Id ₃ do not flow through the terminals 44at to 44dt of the sheet-shaped conductive elastic bodies 44a to 44d, that is, the current measuring circuits 53a to 53d. In this way, by setting the voltage ratio between the AC voltage V ₂ and the AC voltage V ₁ as described above, the offset zero adjustment can be performed simultaneously for all the partial load sensors 4a to 4d. This is because the plurality of partial load sensors 4a to 4d commonly use the first sheet-shaped dielectric elastic body 41 and the second sheet-shaped dielectric elastic body 42 as dielectrics, and the first sheet-shaped conductive elastic body This is because the elastic body 43 and the third sheet-shaped conductive elastic body 45 are commonly used as electrodes. The AC voltage V ₁ (or the AC voltage V ₂ ) may have a frequency of about 10 KHz and an amplitude of about 5V, for example.

When a load is applied to the load sensor unit 4, the capacitance values of the plurality of first capacitors Ca _{1 to} Cd ₁ increase according to the distribution of the load, and the AC currents Ia _{1 to} Id ₁ flowing through the first capacitors Ca _{1 to} Cd ₁ increase. On the other hand, since the capacitance values of the plurality of second capacitors Ca _{2 to} Cd ₂ hardly change, the alternating currents Ia _{2 to} Id ₂ flowing through them hardly change. Therefore, the difference between the alternating currents Ia _{1 to} Id ₁ and the alternating currents Ia _{2 to} Id ₂ flows in the terminals 44at to 44dt of the second sheet-shaped conductive elastic bodies 44a to 44d as the alternating currents Ia _{3 to} Id ₃ . Then, in the electric circuit unit 5, the alternating currents Ia _{3 to} Id ₃ are converted into the load measurement voltages Va to Vd.

Thus, the difference of the alternating current _Ia 2 ～Id ₂ flowing to the alternating current _Ia 1 ～Id ₁ and a plurality of second capacitor _Ca 2 ～Cd ₂ flowing through the first capacitor _Ca 1 ～Cd ₁ a plurality Since the load measurement voltages Va to Vd are obtained, it is stable against environmental changes such as noise and temperature, and highly accurate measurement is possible.

The electric circuit section 5 converts the load measurement voltages Va to Vd obtained there into a load measurement value of digital data in the load measurement value sending circuit 54 and sends it to the load display device 6 as shown in FIG. This transmission is usually wireless, but wired transmission is also possible. The load display device 6 displays, for example, the load measurement values as they are or the mutual ratio of the load measurement values.

In such a load measurement value, since the partial loads 4a to 4d are represented by numerical values, the total load can be determined, and the load balance can be determined.

In the load measuring shoe 1 described above, since the fitting convex portion 3a of the shoe inner bottom portion 3 fits into the fitting concave portion 2b of the shoe main body portion 2 and is not displaced, the shoe inner sole portion 3 comes from the sole of the user. The load can be measured accurately. Further, since the shoe inner sole portion 3 and the load sensor portion 4 can be easily attached to and detached from the shoe main body portion 2, the load sensor portion 4 can be easily replaced. Further, if the load sensor unit 4 has no problem, it can be easily returned to its original state. Therefore, when the load sensor unit 4 deteriorates over time, it is easy to replace it.

Although the load measuring shoe according to the embodiment of the present invention has been described above, the present invention is not limited to the one described in the embodiment, and various design changes within the scope of the matters described in the claims. Is possible.

DESCRIPTION OF SYMBOLS 1 load measuring shoe 2 shoe main body part 2a central recessed part 2b fitting concave part 3 shoe inner bottom part 3a fitting convex part 4 load sensor part 41 first sheet-shaped dielectric elastic body 42 second sheet-shaped dielectric elastic body 41s Void or dent of the first sheet-shaped dielectric elastic body 43 First sheet-shaped conductive elastic body 43t First sheet-shaped conductive elastic body terminals 44a to 44d A plurality of second sheet-shaped conductive elastic bodies 44at-44dt Terminals of a plurality of second sheet-shaped conductive elastic bodies 45 Third sheet-shaped conductive elastic body 45t Terminals of a third sheet-shaped conductive elastic body 46 Load sensor substrate body 43p, 44ap-44dp, 45p printed wiring pattern 5 electric circuit unit 51 first AC output circuit 52 second AC output circuit 53a~53d current measurement circuit 6 load indicating device Ca ₁ ～Cd ₁ a plurality of first capacitor Ca ₂ ～Cd ₂ more Second capacitors Ia _{1 to} Id ₁ AC currents flowing in the plurality of first capacitors Ia _{2 to} Id ₂ AC currents flowing in the plurality of second capacitors Ia _{3 to} Id ₃ Second sheets of the plurality Current flowing through the terminals of the conductive elastic body V ₁ AC voltage output from the first AC output circuit V ₂ AC voltage output from the second AC output circuit Va to Vd Load measurement voltage

Claims (1)

A shoe main body portion in which a central recessed portion that is recessed in the central portion and a fitting recessed portion that opens upward around the central recessed portion are formed;
The shoe has a planar shape that is proportionally reduced from the contour line of the shoe body, and a fitting convex portion that projects downward from the lower surface and that can be fitted into the fitting concave is formed along the planar shape. With a shoe inner bottom that is removable from the main body,
A first sheet-shaped dielectric elastic body, a flat second sheet-shaped dielectric elastic body, a first sheet-shaped conductive elastic body, and a plurality of second sheets in which a large number of voids or recesses are periodically provided. -Shaped conductive elastic body and a third sheet-shaped conductive elastic body, wherein the first sheet-shaped dielectric elastic body is the first sheet-shaped conductive elastic body and the plurality of second sheet-shaped conductive elastic bodies. The second sheet-shaped dielectric elastic body is disposed between the conductive elastic bodies, and the second sheet-shaped dielectric elastic body is disposed between the plurality of second sheet-shaped conductive elastic bodies and the third sheet-shaped conductive elastic body. A plurality of capacitors are formed by using the first sheet-shaped conductive elastic body, the plurality of second sheet-shaped conductive elastic bodies, and the third sheet-shaped conductive elastic body as electrodes, A load sensor section which is the central hollow section of the shoe body section and which is installed below the inner bottom section of the shoe;
A first AC output circuit that applies an AC voltage to the terminals of the first sheet-shaped conductive elastic body, a second AC output circuit that applies an AC voltage to the terminals of the third sheet-shaped conductive elastic body, An electric circuit section having a current measuring circuit for measuring each alternating current flowing through the terminals of the plurality of second sheet-shaped conductive elastic bodies and converting the alternating current into each load measurement voltage;
A load measuring shoe comprising:

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