JP2007330623A - Balance measuring apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a balance measuring apparatus, wherein a subject easily places the feet at the prescribed position of a mounting plate and correction is performed depending on the size of the feet of the subject. <P>SOLUTION: The balance measuring apparatus comprises: three or more weight sensors installed on the lower surface of the mounting plate; a computing means for computing and obtaining a centroid position from weight values measured by the respective weight sensors; a display means for displaying the centroid position obtained in the computing means on a plane for display; a heel positioning part for deciding the position of the heel of the foot of the subject to be placed on the upper surface of the mounting plate or a toe positioning part for deciding the position of the toe; an inner side face positioning part for deciding the position of the inner side face of the foot of the subject to be placed on the upper surface of the mounting plate or an outer side face positioning part for deciding the position of the outer side face; a foot size input means for inputting the size of the foot of the subject; and a correcting means for correcting the centroid position to be displayed in the display means on the basis of the size of the foot inputted by the foot size input means and the centroid position obtained by the computing means. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a balance measuring device that measures the position of the center of gravity of a subject placed on a placement board from the weight applied to a plurality of weight sensors.

  Conventionally, a balance measuring apparatus that can measure the position of the center of gravity of a subject (subject) is known (see, for example, Patent Document 1). This is to obtain the position of the center of gravity from the weight applied to each weight sensor by providing three or more weight sensors. For example, in the one shown in Patent Document 1, the placement plate having a substantially triangular shape on which the subject is placed is provided. A weight sensor is attached to the lower surface of each corner, and the center of gravity position of the subject is obtained by calculation from the output of each weight sensor, and the behavior of the center of gravity position, such as the movement trajectory, is displayed on the plane graph of the display device. To do.

  In the weight scale with the balance measuring function as described above, the subject puts on the mounting plate and performs the weighing scale side by each weight sensor, and calculates the position of the center of gravity by calculation from the weight value measured by the weight sensor. However, since the position of the foot when the subject is placed on the mounting plate needs to be positioned, in the conventional example shown in Patent Document 1, a mark is attached to the center of the mounting plate. The subject placed his / her foot on the mounting plate while looking with his / her eyes so that the mark was located at the center of both feet. However, if the position of the foot placed on the mounting plate is determined by visual observation in this way, the foot is placed at a different position for each measurement, and the center position of both feet is accurately set at the center (origin) of the mounting plate. It was difficult to match. In view of this, a foot positioning part that determines the position of the foot by placing a heel, a toe, or a side surface of the foot on the upper surface of the mounting plate is considered to be able to easily put the foot on the same position of the mounting plate every time. It was.

However, if the foot size of the subject is different, the center position of both feet is located at the same position on the mounting plate even if the foot positioning is determined by applying a heel, a toe or the side of the foot to the foot positioning part. There has been no need for correction due to differences in foot size.
Japanese Patent No. 2760472

  The present invention has been made in view of the above points, and the object of the present invention is that the subject can easily put his / her foot on a predetermined position of the mounting plate and the size of the subject's foot. It is an object of the present invention to provide a balance measuring apparatus capable of performing correction according to the above.

  In order to solve the above problem, in the invention according to claim 1, the position of the center of gravity is determined from three or more weight sensors 2 installed on the lower surface of the mounting plate 1 and the weight value measured by each weight sensor 2. The calculation means 3 obtained by calculation, the display means 4 for displaying the position of the center of gravity obtained by the calculation means 3 on the display plane, and the position of the toe of the subject placed on the upper surface of the mounting plate 1 The heel positioning unit 51 to be determined or the toe positioning unit 52 to determine the position of the toe, and the inner surface positioning unit 53a to determine the position of the inner surface of the subject's foot placed on the upper surface of the mounting plate 1 or the outer surface to determine the position Display means based on the side positioning part 53b, the foot size input means 6 for inputting the size of the subject's foot, the foot size input from the foot size input means 6 and the position of the center of gravity obtained by the calculation means 3 Correction means 7 for correcting the position of the center of gravity displayed at 4 It is to characterized in that it comprises.

  By adopting such a configuration, the subject can easily put his / her foot on a predetermined position of the mounting plate 1, and correction based on the difference in the size of the subject's foot can be performed.

In the invention according to claim 2, in the invention according to claim 1, the plurality of weight sensors 2 are arranged on the lower surface of the mounting plate 1 such that the front-rear distance is D and the left-right distance is W. From the foot size input means 6, the heel positioning part 51 is formed at the position of the rear weight sensor 2 and the inner surface positioning part 53a or the outer surface positioning part 53b is formed at the left and right symmetrical positions. When the size of the input foot is L, the coordinates [X ′, Y ′] of the center of gravity position displayed on the display means 4 are the center positions [X, Y] calculated by the computing means 3 (X is a plurality of coordinates). The right position is positive with the center position of the weight sensor 2 as the origin, and Y is positive with the center position of the plurality of weight sensors 2 as the origin)
X '= X
Y ′ = Y + D / 2 × (1−L / D)
And a correction means 7 for correcting.

  By adopting such a configuration, the subject can easily place his / her foot on the predetermined position of the mounting plate 1 in the case where the heel is mounted on the predetermined position (the heel positioning portion 51) of the mounting plate 1. At the same time, it is possible to perform correction based on the difference in the size of the subject's foot.

In the invention according to claim 3, in the invention according to claim 1, the plurality of weight sensors 2 are arranged on the lower surface of the mounting plate 1 such that the front-rear distance is D and the left-right distance is W. Installed symmetrically, the toe positioning part 52 is formed at the position of the weight sensor 2 on the front side, and the inner side surface positioning part 53a or the outer side surface positioning part 53b is formed at the left / right symmetrical position, and input from the foot size input means 6 If the size of the foot is L, the coordinates [X ′, Y ′] of the center of gravity position displayed on the display unit 4 are the center of gravity positions [X, Y] calculated by the calculation unit 3 (X is a plurality of weights). The right side is positive with the center position of the sensor 2 as the origin, and Y is positive with the center position of the plurality of weight sensors 2 as the origin)
X '= X
Y ′ = Y−D / 2 × (1−L / D)
And a correction means 7 for correcting.

  By adopting such a configuration, the subject can easily place his / her foot on the predetermined position of the mounting plate 1 when the toe is mounted on the predetermined position (the toe positioning portion 52) of the mounting plate 1. At the same time, it is possible to perform correction based on the difference in the size of the subject's foot.

  In the present invention, the subject can easily put his / her foot on a predetermined position of the mounting plate, and correction based on the difference in the size of the subject's foot can be performed.

  Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings.

  As shown in FIGS. 4 to 6, the balance measuring apparatus according to the present embodiment includes two or more weight sensors 2 installed on the lower surface of the mounting plate 1 and two weight values measured by the weight sensors 2. The calculation means 3 for calculating the center of gravity position of the dimension, the display means 4 for displaying the position of the center of gravity obtained by the calculation means 3, the weight display unit 8 for displaying the weight of the subject, and the weight sensor 2. An arithmetic expression for obtaining the center-of-gravity position from the measurement value, a storage device 9 including a semiconductor memory for storing the obtained center-of-gravity position, and foot size input means for inputting the size of the subject's foot (front and back length) 6 and a foot positioning portion 5 and a correcting means 7 to be described later. In this embodiment, the mounting plate 1 having a rectangular shape (here, substantially square shape) in plan view, and the lower side of the mounting plate 1 And a back plate (not shown) disposed through the space A weight sensor 2 is disposed between the lower surface of the four corners of the mounting plate 1 having a rectangular shape in plan view and the upper surface of the back plate, and the weight value measured by the weight sensor 2 and the calculation means 3 are obtained. Is provided with a control unit (not shown) composed of a CPU or the like for controlling the entire operation command, display command on the display means 4, and the like.

  Furthermore, the balance measuring apparatus of this embodiment inputs the electrode D which measures bioimpedance on the part where the sole of the upper surface of the mounting plate 1 is mounted, and the gender, age and height of the subject (not shown). The storage device 9 includes an input unit, a calculation unit that calculates a body fat rate by calculation (also serving as the control unit), and a body fat rate display unit that displays the body fat rate, and the storage device 9 calculates the body fat rate. Is also stored, and the arithmetic means 3 reads the arithmetic expression from the storage device 9 and substitutes the measured bioimpedance and the input body data of the subject into the arithmetic expression. And the body fat percentage is displayed on the body fat percentage display section. As described above, the balance measuring apparatus according to the present embodiment has a function as a weight scale capable of measuring the body fat percentage and the like.

  The calculation means 3 obtains the weight values measured from the four weight sensors 2 and reads a calculation formula for obtaining the center of gravity position from the storage means, and substitutes each weight value into the calculation formula to obtain a two-dimensional center of gravity. It is obtained by calculating the position. Generally, three or more weight sensors 2 need only be arranged on the same plane perpendicular to the vertical direction so that they are not arranged in a straight line. From the weight value measured by each weight sensor 2, The barycentric position on the plane is specified, and the barycentric position is output as X and Y values in the case of XY coordinates, and is output as the value of the distance r from the center and the value of the deviation angle θ in the case of polar coordinates. Although a specific arithmetic expression is omitted, it can be easily obtained from moment balance or the like.

  The display means 4 has a coordinate plane composed of a liquid crystal screen, for example, and displays the position of the center of gravity. The display means 4 has a small pixel such as a personal computer, a liquid crystal TV, a mobile phone screen, etc. that displays photographic images and videos. (100-300 pixels per inch) Or, one pixel is about 1 mm to 2 cm, and it is formed in a size that can be recognized as an area of a certain range rather than a point as seen from the subject on the scale. There are no particular limitations such as those that are displayed, or those that are displayed with numbers or symbols.

  The foot positioning unit 5 is for positioning the front and rear and the left and right of the subject's foot placed on the upper surface of the placement board 1. In the embodiment shown in FIG. 1 to FIG. 6, it has a heel positioning portion 51 with which the rear portion of the heel contacts, and an outwardly facing inner surface positioning portion 53a with which the inner side surface of the foot (especially the side surface of the mother-child ball) contacts. Thus, a recess in which the foot is placed is provided on the upper surface of the placing plate 1, and the rear side face facing forward is used as the heel positioning part 51, and the inside outward side face is used as the inner side face positioning part 53 a.

  Further, instead of forming the inner surface positioning portion 53a, an outer surface positioning portion 53b with which the outer side surface of the foot abuts may be formed as shown in FIG. What is necessary is just the side positioning part 53 to contact | abut. The side surface positioning part 53 contacts at least two places in the front-rear direction of the side surface on the inner side or the outer side of the foot, thereby positioning the left and right positions of the foot placed on the mounting plate 1.

  Further, instead of forming the heel positioning part 51, a toe positioning part 52 with which the front part of the toe abuts may be formed as shown in FIG. By the heel positioning unit 51 or the toe positioning unit 52, the front and back positions of the foot placed on the mounting plate 1 are positioned.

  In the embodiment shown in FIG. 1 to FIG. 6 and FIG. 7A, the foot positioning portion 5 is provided with a concave portion on which the foot is placed on the upper surface of the placement plate 1. In the embodiment shown in (b), a convex portion is provided on the upper surface of the mounting plate 1, but in addition to this, the outer surface or inner side of the heel, toe, or foot is aligned with the upper surface of the mounting plate 1. The foot positioning portion 5 may be provided by providing a line, a groove, or the like, or drawing a picture.

  As an operation of placing the foot on a predetermined position of the mounting plate 1, for example, the rear end of the heel is brought into contact with the front surface of the heel positioning portion 51 or the front end of the toe is brought into contact with the rear surface of the toe positioning portion 52, Twist the baseball to contact the inner surface positioning part 53a or place the outer end of the foot in contact with the outer surface positioning part 53b to place the foot, or the side surface of the mother and child ball and the heel to the inner side positioning part With the foot in contact with 53a, the foot is moved backward to bring the rear end of the heel into contact with the front surface of the heel positioning portion 51, or the foot is moved forward to bring the front end of the toe into contact with the rear surface of the toe positioning portion 52. Regardless of the size and shape of the foot, any subject can easily position the heel on the heel positioning part 51 or the toe on the toe positioning part 52 regardless of the size or shape of the foot.

  Here, the basic operation of the balance measuring apparatus will be described.

  When the subject measures the body weight, when the power switch (not shown) of the scale is turned on and placed on the placement board 1, weight values are measured by the weight sensors 2 at the four corners of the placement board 1, The weight of the subject is measured. As for the body weight, an arithmetic expression for the arithmetic means 3 to calculate the body weight from the storage means (an expression for calculating the sum of the weight values measured by the respective weight sensors 2) is read, and each weight value is substituted to determine the subject's weight. The weight is calculated and the weight is displayed on the weight display unit 8. Similarly to calculating the body weight, the calculation means 3 reads an arithmetic expression for obtaining the center of gravity position from the storage device 9 and calculates the coordinates of the center of gravity position by substituting the weight value of each weight sensor 2.

In general, the original center-of-gravity position coincides with the center position of the foot in the plan view, the front-rear direction being the center from the toes of the foot to the heel and the left-right direction being the center between the left and right feet. However, if the posture is poor, the position of the center of gravity shifts from the center position G _{0 of the} foot (see FIGS. 1 to 3). Therefore, the shift of the center of gravity is measured by the balance measuring device. For this purpose, the center O of the center of gravity calculation by the weight sensor 2 is used as the center position G _{0 of the} foot (that is, the polygon having the weight sensor 2 as the vertex). In the present embodiment, four weight sensors 2 are installed at the positions of the vertices of a rectangle having a front and rear length of D and a left and right length of W in the present embodiment. (See FIG. 3). The weight sensor 2 may be installed at the vertex position of an isosceles trapezoid or an isosceles triangle, for example, in addition to the rectangular vertex position as in the present embodiment. The position of the center of gravity is easier to calculate than the case of being installed asymmetrically, and the load for calculation becomes lighter and the calculation speed increases.

  The correction method will be described below.

Let L be the size of the foot. Here, the XY coordinates are determined with the origin O as the origin and the right direction in plan view as the positive direction of the X coordinate and the forward direction as the positive direction of the Y coordinate. At this time, since the value of the Y coordinate of the heel positioning portion 51 is a -D / 2, the value of Y coordinate of the center position _{G 0} of the foot becomes -D / 2 + L / 2. Further, by forming the left and right symmetrical positions of the plate 1 mounting the inner surface positioning portion 53a or the outer surface positioning portion 53b, the value of X coordinate of the center position G ₀ of the foot is zero. The coordinates of the center of gravity calculated by the weight sensor 2 and the calculation means 3 are [X, Y].

On the other hand, the center of gravity position displayed on the display means 4 is a coordinate system (this is referred to as an X′-Y ′ coordinate) having the original center of gravity position (that is, the foot center position G ₀ ) as the origin. If these coordinates are [X ′, Y ′], from the coordinates of the center position G ₀ of the foot,
X '= X
Y ′ = Y + D / 2 × (1−L / D)
Thus, it is understood that the correction may be performed by adding the correction value Δy = D / 2 × (1−L / D) to the Y coordinate.

For example, when the foot size L is D as shown in FIG.
X '= X
Y ′ = Y + D / 2 × (1−D / D)
= Y
As a result, no correction is necessary.

For example, as shown in FIG. 3, when the foot size L is D / 2,
X '= X
Y ′ = Y + D / 2 × (1−D / 2 / D)
= Y + D / 4
Therefore, D / 4 correction is required.

Further, when positioning is performed by the toe positioning unit 52 as in the embodiment shown in FIG. 7A, the Y coordinate value of the toe positioning unit 52 is D / 2, so that the Y of the foot center position G ₀ The coordinate value is D / 2−L / 2. From this, just like the above,
X '= X
Y ′ = Y−D / 2 × (1−L / D)
Thus, it can be understood that the correction value Δy = −D / 2 × (1−L / D) should be added to the Y coordinate for correction.

  Next, another embodiment will be described with reference to FIG. In the embodiment shown in FIGS. 1 to 6, the heel positioning portion 51 is provided at the position where the rear weight sensor 2 is installed, and a correction value Δy = D / 2 × (1−L / D) is set as the Y coordinate. The correction was made by adding.

On the other hand, in the embodiment shown in FIG. 8, the heel positioning portion 51 is provided at a position shifted d forward from the position where the weight sensor 2 on the rear side is installed. Therefore, Δy = D / 2 × (1−L / D) −d,
X '= X
Y ′ = Y + D / 2 × (1−L / D) −d
Will be corrected.

Although not shown, when the toe positioning part 51 is provided at a position d shifted backward from the position where the front weight sensor 2 is installed, Δy = −D / 2 × (1−L / D) + D,
X '= X
Y ′ = Y−D / 2 × (1−L / D) + d
Will be corrected.

  In the balance measuring device of the present invention, subjects with different foot sizes can easily and stably place their feet on the mounting plate 1 at a predetermined position, and the center of gravity shifts due to the foot size. The center of gravity position can be accurately obtained by correcting.

  The correction method described above can be used for all measuring instruments related to balance measurement.

It is a top view of the state which mounted the average leg | foot on the mounting board of the balance measuring apparatus of this invention. It is a top view of the state which put a big leg on the mounting board same as the above. It is a top view of the state which put the small leg on the mounting board same as the above. It is a block diagram of the principal part of the balance measuring apparatus of this invention. It is a perspective view of the balance measuring apparatus of this invention. It is a top view same as the above. (A) (b) is a top view of the balance measuring apparatus provided with the mounting board of another example, respectively. It is a top view in the state where a foot was put on the mounting board of other embodiments.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mounting plate 2 Weight sensor 3 Calculation means 4 Display means 51 踵 Positioning part 52 Toe tip positioning part 53 Side positioning part 53a Inner side surface positioning part 53b Outer side surface positioning part 7 Correction means 8 Weight display part 9 Storage device D Electrode G ₀ Center of gravity O Origin

Claims (3)

  Three or more weight sensors installed on the lower surface of the mounting plate, calculating means for calculating the center of gravity position from the weight value measured by each weight sensor, and a plane for displaying the center of gravity position determined by the calculating means Display means for displaying on top, heel positioning part for determining the position of the heel of the subject's foot placed on the upper surface of the mounting board, or a toe positioning part for determining the position of the toe, and the subject placed on the upper surface of the mounting board Input from the inner surface positioning portion for determining the position of the inner surface of the foot or the outer surface positioning portion for determining the position of the outer surface, the foot size input means for inputting the size of the subject's foot, and the foot size input means A balance measuring apparatus comprising correction means for correcting a gravity center position displayed on the display means based on a foot size and a gravity center position obtained by a calculation means. A plurality of weight sensors are installed symmetrically on the lower surface of the mounting plate so that the distance between the front and rear is D and the distance between the left and right is W, and the heel positioning part is formed at the position of the rear weight sensor. When the side surface positioning portion or the outer surface positioning portion is formed at a symmetrical position, and the foot size input from the foot size input means is L, the coordinates [X ′, Y ′ of the center of gravity position displayed on the display means ] Is the center of gravity position [X, Y] calculated by the computing means (X is positive on the right with the center position of the plurality of weight sensors as the origin, and Y is positive on the front with the center position of the plurality of weight sensors as the origin. )
X '= X
Y ′ = Y + D / 2 × (1−L / D)
2. The balance measuring apparatus according to claim 1, further comprising correction means for correcting. A plurality of weight sensors are installed on the lower surface of the mounting plate symmetrically so that the front-rear distance is D and the left-right distance is W, and the toe positioning portion is formed at the position of the front weight sensor, and the inner surface When the positioning part or the outer surface positioning part is formed in a symmetrical position and the foot size input from the foot size input means is L, the coordinates [X ′, Y ′] of the center of gravity position displayed on the display means Is the center of gravity position [X, Y] calculated by the computing means (X is positive with the center position of the plurality of weight sensors as the origin, Y is positive with the center position of the plurality of weight sensors as the origin) Against
X '= X
Y ′ = Y−D / 2 × (1−L / D)
2. The balance measuring apparatus according to claim 1, further comprising correction means for correcting.

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