JP2001000614A - Swing analyzing method and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To analyze a swing without restricting joint motion by measuring a dynamic vector by setting individual coordinate systems on both sides in the vicinity of a joint at swinging time, and analyzing a swing by determining a joint angle from a relative angle between both coordinate systems. SOLUTION: An acceleration sensor 1 is installed on a ring-shaped supporter 5, and an acceleration sensor 2 is installed on a glove 6, respectively to be respectively installed on a front arm in the vicinity of a wrist and the back of a hand to measure an angle of the wrist at swinging time. That is, X, Y, Z axes of the acceleration sensor 1 are used as a reference coordiante system, and X', Y', Z' axes of the acceleration sensor 2 are used as a motional coordiante system to express motion of the wrist as the positional relationship between both coordiante systems. A palm back bending angle ϕ and an ulnoradial bending angle θ are calaculated. A swing is photographed by a video camera to determine a joint angle. A measuring result and the joint angle are compared and examined to thereby analyze the swing without restricting joint motion.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variety of athletic sports such as golf in which a player swings athletic equipment and hits a ball.
The swing is analyzed by obtaining the angle of the joint of the competitor during the swing (for example, the angle between the hand and the forearm in the case of the wrist joint), and the swing is corrected so that the angle of the joint becomes an appropriate angle. The present invention relates to a swing analysis method and a swing analysis method used therefor.

[0002]

2. Description of the Related Art Golf is said to be a national sport for a lifetime.
It is estimated that there are over 10,000 people. With the increase in the athletic population, it has become clear that there is a limit to improving the skills efficiently by the conventional training method relying only on experience and intuition. In all sports, not only golf, it is an important issue to measure the dynamic movement of a competitor and to determine what kind of movement can improve the skill.

[0003] By the way, analysis of human motion and behavior requires measurement of joint motion (for example, relative motion between a hand and a forearm). As a conventional joint angle measuring method, a non-contact method includes an optical method using a video camera or the like and a magnetic sensor. Examples of the contact type include a rotary electric goniometer and a goniometer using elastic electric resistance. Optical techniques have been able to measure human motion fairly accurately with improvements in camera performance and image analysis methods.

[0004]

However, in the above-described optical method, the measurable portion is limited to a range that can be seen from the outside, so that the target portion tends to be limited, and a marker that serves as a marker for image analysis is hidden. There is a problem that the measurement becomes impossible due to the displacement of the marker or the measurement accuracy is reduced. Further, in the measurement using a magnetic sensor, there is a problem that accurate measurement cannot be performed if there is a metal such as a metal in a measurement range. Further, these methods have an advantage of non-contact, but have a problem that the range of action is limited. In addition, measurement with an electric goniometer or electric resistance is installed along the joint,
There has been a problem that the joint movement is restricted or the instrument is easily damaged by rapid joint movement.

The present inventor has proposed a method of measuring a change in a joint angle during a swing in various athletic sports such as golf by mounting a sensor capable of measuring a dynamic vector such as an acceleration sensor. investigated.

[0006]

That is, an object of the present invention is to solve the above-mentioned problems, and to provide a swing analysis method and a device thereof in which a joint motion is less restricted in a contact-type measurement method. I do. Therefore, the swing analysis method according to claim 1 of the present invention provides an athletic competition in which a player hits a ball with the above-mentioned athletic implement by swinging the athletic implement grasped by hand, and the joint at a position near the joint of the athlete during the swing. An individual coordinate system is set on both sides to measure a dynamic vector, and a vector on both sides of the joint is assumed to be equal, and a relative angle between the two coordinate systems is determined to obtain an angle of the joint. The swing of the competitor is analyzed based on the angle.

[0007] The swing analysis method of the second aspect is the first aspect of the invention.
In the method of (1), a dynamic vector is measured in the vicinity of the part of the athletic equipment hitting the ball during the swing, and the moment at which the athletic equipment hits the ball is determined based on the measured value. It is characterized in that an angle is obtained.

[0008] The swing analysis method according to claim 3 is based on claim 1.
In the method of the second aspect, the joint is a wrist joint of an athlete.

According to a fourth aspect of the present invention, there is provided a swing analyzing method according to the first aspect.
4. The method according to any one of items 3 to 3, wherein the athletic competition is golf, and an angle of a joint of both right and left wrists is obtained.

[0010] The swing analysis method according to claim 5 is based on claim 1.
The method according to any one of claims 1 to 4, wherein the vector includes a velocity, an acceleration, an angular velocity, an angular acceleration, or a position vector.

According to a sixth aspect of the present invention, in the swing analysis method according to any one of the first to fifth aspects, a computer executes a calculation procedure for obtaining a joint angle based on a vector measured on both sides of the joint. This is a computer-readable recording medium on which a processing procedure for causing the recording medium to be recorded is recorded.

According to a seventh aspect of the present invention, in the athletic competition in which the athletic implement hits a ball by swinging the athletic implement gripped by a hand, the swing analyzing apparatus is provided on both sides of the joint near the joint of the player during the swing. First and second measuring means respectively attached to each for measuring a dynamic vector, and the first and second measuring means respectively setting an individual coordinate system on both sides of the joint and assuming that the vectors on both sides of the joint are equal. And a joint angle detecting means for calculating a relative angle between the two coordinate systems from the measurement value of the two measuring means to obtain an angle of the joint.

[0013] The swing analyzing apparatus according to the eighth aspect is the seventh aspect.
And a third measuring means attached to the vicinity of the ball hitting part of the athletic equipment for measuring a mechanical vector, wherein the joint angle detecting means is a third measuring means.
The angle of the joint at the moment when the athletic equipment hits the ball is obtained based on the measurement value of the measuring means.

According to a ninth aspect of the present invention, there is provided a swing analyzing apparatus according to the seventh aspect.
Alternatively, in the configuration of 8, the vector is an acceleration, and the first to third measuring units each include an acceleration sensor.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a method and an apparatus for analyzing a golf swing will be described below with reference to the drawings. In the analysis of the swing, it is important to focus on which part of the body of the competitor to exercise, but the most important thing in the sport of golf is
This is how to make the ball fly straight, and for that purpose, at the moment of impact between the ball and the club head, the club head must be directed straight to the target launch direction of the ball.

In this case, straightening the head involves various factors, one of which is the movement of the wrist. Therefore, in the experiment in the present embodiment, as shown in FIG. 1, two acceleration sensors 1 and 2 (first and second measuring means) are respectively mounted on the forearm 3 and the back of the hand 4 near the wrist. The angle of the wrist during the golf swing was measured. The acceleration sensor 1 is mounted on the ring-shaped supporter 5, while the acceleration sensor 2 is mounted on the glove 6, and the supporter 5 and the glove 6 are mounted so that the acceleration sensors 1 and 2 can be mounted.

As described above, the use of the supporter 5 and the gloves 6 facilitates the attachment and detachment of the acceleration sensors 1 and 2, and the provision of the supporter 5 and the gloves 6 separately restrains the wrist. The degree to which it is performed is also reduced. Actually, for example, both the acceleration sensors 1 and 2 may be attached to a long glove in which the supporter 5 and the glove 6 are integrated.

In the experiment, a capacitance type three-axis acceleration sensor (C3A-02-30: 54 × 53 × 16 mm, weighing 65 g) was used as the acceleration sensors 1 and 2 in the experiment.
Sumitomo Precision Industries, Ltd.). This acceleration sensor can detect acceleration applied to an object by using a change in capacitance by decomposing the acceleration into three axes of X, Y, and Z, and has high impact resistance. When the present swing analysis method is actually performed, any acceleration sensors 1 and 2 can be used as long as the accelerations in the X, Y, and Z axes can be measured.

Further, as shown in FIG.
An acceleration sensor 8 (third measuring means) capable of measuring the acceleration in one axial direction near the club head 7a in order to detect the moment of impact of hitting a golf ball (not shown)
Was attached. In this experiment, a very small piezoresistive single-axis acceleration sensor having a size of 33 × 15 × 4 mm (3028─020: IC SENSORS)
(Made by the company).

The characteristics of the acceleration sensor 8 are that the acceleration detection range is as wide as ± 20 G and that it has high shock resistance. The reason for using this acceleration sensor is that it is expected that a considerably large acceleration will be applied to the club head. When the present swing analysis method is actually performed, an arbitrary one-axis acceleration sensor, a three-axis acceleration sensor, or the like can be used as the acceleration sensor 8 mounted on the club head.

Since the wrist joint can be considered as a biaxial joint in which the hand 4 can bend vertically and horizontally with respect to the forearm 3, a method of measuring the joint motion of the biaxial joint will be examined here. At this time, as shown in FIG. 1, the two acceleration sensors 1 and 2 have the Z axis in the vertical direction of the forearm 3 and the back of the hand 4, the Y axis in the left and right direction of the forearm 3 and the back of the hand 4,
It is mounted so that the X axis is in the front-back direction of the forearm 3 and the back of the hand 4.

Wrist dorsiflexion (upward flexion) and palm flexion (downward flexion) include rotation about the Y-axis, shaking flexion (outward flexion),
Flexing (inward bending) can be expressed as rotation about the Z axis. The X, Y, and Z axes of the acceleration sensor 1 mounted on the forearm 3 on the elbow side of the wrist are used as a reference coordinate system, and the X ', Y', and Z 'axes of the acceleration sensor 2 mounted on the back of the hand 4 are moved. Coordinate system. At this time, the movement of the wrist is represented by the positional relationship between the two coordinate systems.

Here, from the state where the motion coordinate system shown in FIG. 1 matches the reference coordinate system, the motion coordinate system is changed to Y of the reference coordinate system.
The rotational movement of the two coordinate systems is expressed assuming that the axis is rotated by φ (see FIG. 3) and the Z ′ axis of the rotated coordinate system is rotated by θ (see FIG. 4). Hereinafter, a method for calculating the palm dorsiflexion angle φ (the vertical rotation angle of the hand 4 with respect to the forearm 3) and the scale flexion angle θ (the horizontal rotation angle of the hand 4 with respect to the forearm 3) will be described. First, from the state where the motion coordinate system of FIG. 1 matches the reference coordinate system,
A rotation transformation matrix for rotating the Y-axis of the reference coordinate system and the Z'-axis of the motion coordinate system is obtained.

First, the Y axis of the reference coordinate system is rotated by φ
Roll (in FIG. 3, the X axis is X₁Z axis becomes Z 'axis
The rotation transformation matrix to be moved) is given by equation (1) in Equation 1.
Rotation about the Z 'axis of the motion coordinate system by?
And the Y axis is X on the Y 'axis.₁The axis moves to the X 'axis)
The rotation transformation matrix is given by equation (2). Follow
According to the equations (1) and (2), the rotation is performed in this order.
Rotation transformation matrix R _yzIs given by Equation (3) in Equation 1.
Can be.

Next, the X, Y, and Z components of the acceleration a measured by the acceleration sensor 1 mounted on the forearm 3 side of the wrist are ( _ax1 , _ay1 , _az1 ), and the acceleration mounted on the back of the hand 4 The X, Y, and Z components of the acceleration a ′ measured by the sensor 2 are defined as (a _x2 , a _y2 , a _z2 ). At this time, since the two acceleration sensors 1 and 2 are both mounted near the joints of the wrist, the radius of rotation of the rotational motion of the wrist, such as dorsiflexion or extensor flexion, becomes sufficiently small.

[0026]

(Equation 1)

Further, the two acceleration sensors 1 and 2 are brought close to each other.
Rotation around a certain point in space
Acceleration generated in the two acceleration sensors 1 and 2 when performing motion
The degrees a and a 'can be made equal. Therefore,
Two acceleration components (a_x1, A _y1, A_z1) And (a)_x2,
a_y2, A_z2) Is the rotation transformation matrix R_yzIn the number 1 using
Equation (4) can be expressed. And the following
As shown in equations (5) and (6) in equation 2,
The dorsiflexion angle φ and the scale flexion angle θ were determined.

[0028]

(Equation 2)

Hereinafter, the results of actually measuring the joint angle by attaching the acceleration sensors 1 and 2 to the vicinity of the joints of both wrists with a golf expert as a subject will be shown. At the time of measurement, the swing of the subject was also photographed by a video camera, and joint angles were obtained from the video images, and were compared with the measurement results obtained by the acceleration sensors 1 and 2. In addition, it was expected that the angle of the wrist would not be sufficiently understood only by shooting from one direction with a video camera. Therefore, one video camera could be used in three directions (in front of the subject, diagonally right front when viewed from the subject, and viewed from the subject). (Diagonally left forward) from the golf swing.

In this case, if the subject's swing is not repetitive, there is no point in comparing the wrist angle measured from images taken in three directions with the wrist angle obtained from the acceleration. Since the subject's golf skill was sufficiently advanced, it was assumed that the swing was repeatable. Note that the golf golf ball “address” used below refers to a stationary state before the start of a swing (in this state, the club head 7a is usually located near the ball 9), and The “of swing” refers to the moment when the club head 7a moves to the highest position and the body is twisted the most when the golf club 7 is swung up. The moment when the head 7a hits the ball.

FIGS. 5 to 8 are explanatory views simulating an image at a moment such as an address and an impact in a video image taken by a video camera. FIGS. 5 and 6 show images taken from the front of the subject. 7 and 8 show a case where the image is taken obliquely from the front right of the subject. In FIGS. 5 and 6, φ is the palm dorsiflexion angle, θ in FIGS. 7 and 8 is the flexure flexion angle, and A in each figure is an auxiliary line for determining the angle of the wrist. It should be noted that the illustration of the case where the image is taken from the diagonally left front as viewed from the subject is omitted.

FIG. 9 and FIG. 10 are graphs based on the detection outputs from the acceleration sensors 1 and 2 and the acceleration sensor 8, respectively.
9 is a time waveform of the angle calculated by the method of calculating the motion angle of the biaxial joint according to the equations (5) and (6). FIG. 9 shows the palm dorsiflexion angle φ of the left and right hands, and FIG. 6 shows a temporal change of the flexure angle θ. In FIGS. 9 and 10, T1 is the start of the swing, T2 is the moment of the top of swing,
Numeral 3 denotes the moment of impact, and T1 to T3 are obtained from the output of the acceleration sensor 8 mounted near the club head 7a.

That is, T1 Is the time when the acceleration of the golf club 7 starts to increase from “0” (address state),
T2 is determined as the time when the acceleration becomes “0” at the turning point of swinging up and down of the golf club 7, and T3 is determined as the time at which the absolute value of the acceleration decreases due to the collision with the ball at impact.

As a result of the above experiment, the angle of the wrist obtained from the acceleration and the angle of the wrist verified by the swing image almost coincide (with an error of less than 10%) except for the palm dorsiflexion angle φ of the left hand before and after the impact. It became clear that this measurement method was effective. Table 1 below shows a comparison between the wrist angle calculated using the acceleration according to the method of the present invention (FIGS. 9 and 10) and the wrist angle measured from an image taken by a video camera (FIGS. 5 to 8). Is shown. The angles of the respective wrists obtained by actually measuring 12 times almost coincided with the angles shown in FIGS. 9 and 10 (with a maximum error of 10% or less).

[0035]

[Table 1]

As described above, it has been clarified that the method of measuring the angle of the joint of the wrist of the present invention using the acceleration sensors 1, 2, and 8 is effective through the experiment with the expert golfer as a subject. So, using this measurement method, compare the angle of the wrist between the advanced (or intermediate) golfer and the beginner in the golf swing, and if the beginner corrects where on the swing, the ball will fly constantly and straight like the advanced player The experiment was further conducted on a plurality of subjects different from the above-mentioned subjects, and a method of correcting a swing of a beginner was examined. Table 2 shows the golf history and handicap of each subject. The subjects 1 and 2 who had no golf experience were allowed to swing freely without instructing the swing in advance.

[0037]

[Table 2]

First, some defects were found in the subject 1 by measuring the angles of both wrists, which will be described. FIG. 11 shows the data obtained by calculating the palm dorsiflexion angles φ of the left and right hands of the subject 1 based on the accelerations detected by the acceleration sensors 1 and 2. In the same manner as above, T1 is the start of the swing, and T2 is the moment of the top of swing. , T3 at the time of impact, and the same applies to the following drawings. This figure 1
From the angle of the wrist after the impact at 0, it can be seen that the subject 1 has not made a movement (so-called wrist turn) in which the left palm dorsiflexion angle φ becomes larger than the right palm dorsiflexion angle φ after the impact. If this wrist turn is not performed, the ball will tend to fly to the right.

At the start of the swing shown in FIG. 11, since the left palm dorsiflexion angle φ is small and the right palm dorsiflexion angle φ is large, it is preferable to place the ball further to the left of the body in the initial setting. It turns out that it is. Further, FIG. 12 shows the flexion angles θ of the right and left hands of the subject 1 at the start of the swing in FIG.
Is large, it can be understood that there are drawbacks such as the subject 1 standing too far or taking a stance away from the ball. The ideal angles of the palm dorsiflexion angle φ and the flexure flexion angle θ in both the left and right hands in FIGS. 11 and 12 are that the angle of the wrist at the start of the swing and the moment of the impact coincide with each other, Is performed on the condition that this is performed, and the same applies to ideal angles in the following drawings.

Next, FIGS. 13 and 14 show the results of calculating the angles of both wrists of the subject 2 as a beginner based on the acceleration. In the figure, φ is the palm dorsiflexion angle, θ is the measure flexion flexion angle, and the same applies to the following angular diagrams. What can be said in common for beginners such as the subjects 1 and 2 is that the dorsiflexion angle θ of the left palm is bent in the minus direction (the back of the hand is in the palm direction) during the top-of-swing. It should be noted that when this movement occurs, the swing trajectory becomes unstable.

FIGS. 15, 16 and 17, 18
Shows the results of calculating the angles of both wrists of subjects 3 and 4 who are advanced golfers (or intermediate advanced golfers) based on the acceleration. The first thing that can be said in common for these advanced people is
The difference between the right palm dorsiflexion angle φ at the start of the swing and the right palm dorsiflexion angle φ at the time of impact is considerably larger than that of a beginner. The difference between the right hand flexion angle θ at the start of the swing and the right hand flexion angle θ at the time of impact is larger than that of a beginner. From the movements of these two wrists, it is anticipated that the advanced player is more accurately shifting the weight and catching the ball than the beginner. As described above, by measuring the angle of the wrist using the acceleration sensors 1 and 2, it is possible to grasp various movements during the swing, such as the position of the ball at the time of addressing and whether or not the weight is moving. did it.

As described above, the angle of the wrist obtained from the acceleration and the angle of the wrist verified on the swing image substantially coincide (with an error of less than 10%) except for the palm dorsiflexion angle φ of the left hand before and after the impact. It was confirmed that this measurement method was effective. According to this measurement method, unlike the image processing, there is no limitation on the standing position, the direction, and the like, and a large-scale device such as a magnetic field sensor is not required in units of a room. Therefore, the acceleration sensor is attached to the supporter or the like. This has the advantage that it can be easily mounted and can be easily measured.

In the above description, the case where the acceleration sensor is mounted on the wrist to detect the angle of the wrist has been described. However, the acceleration sensor is further mounted on the knee and elbow to perform a more comprehensive swing correction. Is also possible. As described above, if the present invention is used, the swing can be corrected and an early improvement can be expected without taking a lesson or the like of an instructor.

FIG. 19 shows an example of the configuration of the apparatus for performing the swing analysis according to the present embodiment described above. A pair of acceleration sensors 1 and 2 corresponding to both left and right hands and an acceleration sensor attached to the golf club 7 are shown. 8, amplifiers 10 connected to the output terminals of the acceleration sensors 1, 2, 8 via connection lines, respectively, and A connected to the output side of each amplifier 10.
An A / D (analog / digital) converter 11 and a personal computer (personal computer) 12 to which the A / D converter 11 is connected.

The personal computer 12 has installed therein a program for calculating the wrist angle from the outputs of the acceleration sensors 1 and 2 based on the equations (5) and (6) in the above equation (2). When the subject swings, the waveforms and the like shown in FIGS. 9 and 10 are displayed on the screen of the personal computer 12, and the analysis results can be saved or printed. The program may have a function of displaying a message instructing the subject to place the ball or the like on the subject based on the analysis result of the wrist angle, as described above.

In addition, among the constituent elements shown in FIG. 19, the acceleration sensors 1, 2, 8, the amplifier 10, the A / D converter 11, and the CD other than the personal computer 12 and the above-mentioned program are recorded.
-If a recording medium such as a ROM is sold as a set of kits, analysis of a golf swing can be performed at ordinary households and the like only by connecting the kit to a personal computer and installing the program.

In the above embodiment, the analysis of the golf swing has been described. However, it is also possible to analyze the swing in various sports such as gateball, tennis, baseball, and the like, in which a ball is hit by using a game tool, in the same manner. It is possible.

In the above embodiment, the angle of a joint such as a wrist is obtained based on the acceleration.
There is an advantage that the relatively small acceleration sensors 1 and 2 can be easily obtained. However, using various mechanical vectors such as velocity, angular velocity, angular acceleration, or position vector other than acceleration, the joint angle is calculated by the above-described coordinate system conversion method. You can also ask. For example, when determining the angle of the wrist based on the speed, two speed sensors may be attached instead of the acceleration sensors 1 and 2 in FIG. It goes without saying that the acceleration sensor 8 on the golf club 7 side can be replaced by a speed sensor or the like.

[0049]

According to the swing analysis method of the first aspect of the present invention, in an athletic game in which a player hits a ball with the above-mentioned athletic implement by swinging the athletic implement held by a hand, the swing analysis method can be performed in the vicinity of the joint of the athlete during the swing. An individual coordinate system is set on each side of the joint to measure a dynamic vector, and the angle of the joint is determined by determining the relative angle between the two coordinate systems on the assumption that the vectors on both sides of the joint are equal. Since the swing of the competitor is analyzed based on this angle, the angle of the joint measured for each competitor is deviated from the preferable joint angle by analyzing and examining the degree. The competitor can be corrected so as to be able to swing while maintaining a preferable joint angle. This allows
The swing can be accurately corrected based on scientific data without relying on the guidance of a senior person based on experience or intuition.

The swing analysis method according to claim 2 is based on claim 1.
In the method of (1), a dynamic vector is measured in the vicinity of the part of the athletic equipment hitting the ball during the swing, and the moment at which the athletic equipment hits the ball is determined based on the measured value. Since the angle is determined, it is possible to correct the joint angle to an accurate angle at the moment of hitting the ball.

According to the third aspect of the present invention, there is provided a swing analyzing method.
In the second method or the second method, since the joint is a joint of a player's wrist, it is possible to correct the wrist angle, which is particularly important for properly hitting the ball, to be an appropriate angle.

The swing analyzing method according to claim 4 is based on claim 1.
In the method according to any one of the items (3) to (3), the athletic competition is golf and the angle of the joint of the right and left wrists is obtained. Therefore, by correcting the angle of both wrists, it is possible to perform an accurate golf swing. become.

The swing analysis method according to claim 5 is based on claim 1.
In the method according to any one of (4) to (4), since the vector includes a velocity, an acceleration, an angular velocity, an angular acceleration, or a position vector, the angle of the joint can be obtained by a coordinate transformation method using any of these vectors. The vector used for measuring the joint angle can be appropriately selected according to the type of the game, the type of the available small sensor, and the like, which is preferable.

According to a sixth aspect of the present invention, in the swing analysis method according to any one of the first to fifth aspects, a computer executes a calculation procedure for obtaining a joint angle based on a vector measured on both sides of the joint. The computer is a computer-readable recording medium on which the processing procedure for recording is recorded. By installing the program on the recording medium into a computer such as a personal computer, the above-described useful swing analysis method, particularly, the arithmetic processing of the joint angle is performed. Can be easily executed using a computer, and processing such as displaying or printing the obtained joint angle data on the computer screen can be easily performed.

According to a seventh aspect of the present invention, in the athletic competition in which the ball is hit with the athletic implement by swinging the athletic implement gripped by the hand, the swing analyzing apparatus is provided on both sides of the joint near the joint of the player during the swing. First and second measuring means respectively attached to each for measuring a dynamic vector, and the first and second measuring means respectively setting an individual coordinate system on both sides of the joint and assuming that the vectors on both sides of the joint are equal. (2) a joint angle detecting means for calculating the relative angle between the two coordinate systems from the measurement value of the measuring means to determine the angle of the joint; Regardless of the method, the joint angle can be easily measured simply by attaching measurement means for detecting the vector such as acceleration near the athlete's joint. Also it is intended to withstand sufficiently practical.

The swing analyzing apparatus according to claim 8 is the same as claim 7.
And a third measuring means attached to the vicinity of the ball hitting part of the athletic equipment for measuring a mechanical vector, wherein the joint angle detecting means is a third measuring means.
Since the angle of the joint at the moment when the sports equipment hits the ball is determined based on the measurement value of the measuring means, the magnitude of the joint angle at the moment of hitting the ball is important. Measurement can be performed, and based on the measurement result, the swing can be corrected so that the joint angle becomes an appropriate size, and the skill can be improved.

According to a ninth aspect of the present invention, there is provided the swing analyzing apparatus according to the seventh aspect.
Or in the configuration of 8, the vector is an acceleration, and the first to third measuring means are each composed of an acceleration sensor, and the acceleration sensor is a small one that can be worn near a joint of a player's body. Since it is relatively inexpensive and easily available, it is preferable to use an acceleration sensor as a measuring means in configuring the present swing analysis device.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing two acceleration sensors near a wrist in a swing analysis device according to an embodiment of the present invention.

FIG. 2 is a schematic perspective view showing an acceleration sensor near a club head in the swing analysis device.

FIG. 3 is an explanatory diagram showing rotation of a reference coordinate system in an acceleration sensor near a wrist.

FIG. 4 is an explanatory diagram showing rotation of a motion coordinate system in an acceleration sensor near a wrist.

FIG. 5 is an explanatory view showing how a wrist angle is measured using a video camera for comparison with a wrist angle based on acceleration in the present embodiment.

FIG. 6 is another explanatory diagram showing how the wrist angle is measured using a video camera for comparison with the wrist angle based on acceleration in the present embodiment.

FIG. 7 is still another explanatory diagram showing how a wrist angle is measured using a video camera for comparison with a wrist angle based on acceleration in the present embodiment.

FIG. 8 is another explanatory diagram showing a state in which a wrist angle is measured using a video camera for comparison with a wrist angle based on acceleration in the present embodiment.

FIG. 9 is a graph showing a result of measuring a palm dorsiflexion angle in an advanced golf swing using acceleration.

FIG. 10 is a graph showing the result of measuring the flexure angle of a golfer in an advanced golf swing using acceleration.

FIG. 11 is a graph showing the results of measuring the dorsiflexion angle of the palm of a golfer in a golf swing of a beginner 1 using acceleration.

FIG. 12 is a graph showing the results of measuring the flexure angle of the golf swing of the novice subject 1 in the golf swing using acceleration.

FIG. 13 is a graph showing the results of measuring the dorsiflexion angle of the palm of a golfer in the golf swing of a beginner 2 using acceleration.

FIG. 14 is a graph showing a result of measuring a flexure angle of a golf swing of a beginner 2 in a golf swing using acceleration.

FIG. 15 is a graph showing the results of measurement of the palm dorsiflexion angle of a golfer of an advanced test subject 3 in a golf swing using acceleration.

FIG. 16 is a graph showing a result of measuring a flexure angle of a golf swing of an expert 3 in a golf swing using acceleration.

FIG. 17 is a graph showing the result of measuring the palm dorsiflexion angle of a subject 4 who is an intermediate or advanced person in a golf swing using acceleration.

FIG. 18 is a graph showing the result of measuring the flexure angle of the golf swing of a subject 4 who is an intermediate or advanced player using the acceleration.

FIG. 19 is an explanatory diagram showing an example of the configuration of a swing analysis device for executing the method of the present embodiment.

[Explanation of symbols]

 1, 2 acceleration sensor 7 golf club (competition equipment)

Continued on the front page (72) Inventor Satoshi Kurata 1-1-1, Nojihigashi, Kusatsu-shi, Shiga Ritsumeikan University Biwako-Kusatsu Campus Science and Engineering Department (72) Inventor Ayumu Takahashi 1-10 Fusomachi, Amagasaki-shi, Hyogo (72) Inventor Tetsuya Kagawa 1-10 Fuso-cho, Amagasaki City, Hyogo Prefecture Sumitomo Precision Industries, Ltd.

Claims (9)

[Claims] 1. In an athletic game in which a ball is hit with the above-mentioned athletic implement by swinging the athletic implement grasped by hand, an individual coordinate system is set on both sides of the joint near the athlete's joint during the swing. Then, the mechanical vector is measured, and assuming that the vectors on both sides of the joint are equal, the angle of the joint is determined by calculating the relative angle between the two coordinate systems, and the swing of the competitor is analyzed based on the angle. A swing analysis method, characterized in that: 2. A dynamic vector is measured in the vicinity of a part of the athletic implement hitting the ball during a swing, and a moment at which the athletic implement strikes the ball is determined based on the measured value. 2. The swing analysis method according to claim 1, wherein an angle of the swing is calculated. 3. The swing analysis method according to claim 1, wherein the joint is a wrist joint of an athlete. 4. The game according to claim 1, wherein the athletic competition is golf, and the angles of the joints of the left and right wrists are determined.
4. The swing analysis method according to any one of claims 3 to 3. 5. The vector includes velocity, acceleration, angular velocity,
The swing analysis method according to any one of claims 1 to 4, further comprising an angular acceleration or a position vector. 6. The swing analysis method according to claim 1, wherein a computer performs a calculation procedure for calculating an angle of the joint based on a vector measured on both sides of the joint. Recorded,
Computer readable recording medium. 7. In an athletic competition in which a player hits a ball with the above-mentioned athletic implement by swinging the athletic implement held by a hand, the jig is attached to both sides of the joint in the vicinity of the athlete's joint during swing, and each of them is mechanically attached. First and second measuring means for measuring a simple vector, and a coordinate system respectively set on both sides of the joint, and the vectors on both sides of the joint are assumed to be equal to each other, from the measured values of the first and second measuring means. And a joint angle detecting means for calculating a relative angle between the two coordinate systems to obtain an angle of the joint. 8. A game machine comprising: a third measuring means attached to a vicinity of a ball hitting part of the athletic equipment for measuring a dynamic vector, wherein the joint angle detecting means is based on a value measured by the third measuring means. The swing analyzing apparatus according to claim 7, wherein the angle of the joint at the moment when the athletic equipment hits the ball is obtained. 9. The method according to claim 1, wherein the vector is an acceleration,
9. The swing analyzing apparatus according to claim 7, wherein each of the third to third measuring means comprises an acceleration sensor.