JP2003117043A - Golf club selecting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a golf club selecting method capable of allowing even a beginner to quantitatively determine the adequacy of the golf club not sensuously and experimentally by simple device and operation and to properly and easily select the golf club optimum for the player. SOLUTION: In swinging the golf club by the golfer, the locus data D of a center position of the load generated in the direction vertical to a horizontal face is measured, and the golf club optimum for the golfer is selected on the basis of the locus data D. The locus data D is preferably measured from the address to the finish of the swing in synchronization with a swing image of the golf club.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a golf club selecting method, and more particularly, to measuring the weight shift of a golfer during a golf club swing and selecting the optimum golf club for the golfer.

[0002]

2. Description of the Related Art Since golfers have a wide variety of swing forms, the optimum golf club for each golfer is different, and the golf club affects the score. That is important to golfers.

As an optimum golf club, particularly in the case of wood, it is required that the hit ball does not bend, and it is necessary to actually hit the ball and measure the flight distance, the launch direction and the like at a golf course and a practice field. You can empirically and sensibly judge the suitability of a club. In addition, in the places where actual hitting is impossible as described above, the initial conditions of hitting, that is, the hitting face angle, head speed, etc. are measured, or the swing form is checked by the swing image, and further, the strain gauge on the shaft, etc. Have been proposed to measure the behavior of a golf club by measuring the degree of bending of a shaft, etc. and investigating optimum conditions for golfers.

For example, in Japanese Unexamined Patent Publication No. 10-244023, a golf club is selected in which a strain gauge is attached in a direction parallel and perpendicular to the face surface of a golf club shaft, characteristics of the swing are investigated, and a golf club suitable for the swing is selected. A swing analysis device has been proposed.

Further, Japanese Patent Application Laid-Open No. 6-210027 proposes a golf club design method in which a swing simulation of a golf club is performed from a swing image by using the finite element method, and is utilized for club design. further,
Japanese Unexamined Patent Publication No. 2001-112903 proposes a golf swing analysis method in which a swing behavior is analyzed using a three-dimensional magnetic sensor.

Further, in Japanese Unexamined Patent Publication No. 5-285246, a floor reaction force meter detects a state of weight movement during a golf swing motion, and the positional information of the ball and the body at the time of addressing is checked to obtain a variation between trials. A golf swing check system has been proposed for comparing. Also,
In JP-A-7-250928, a floor reaction force trajectory during a swing is drawn to visualize the movement of weight during a golf swing, and the quality of the swing is judged by comparing it with the trajectory of the center of gravity position of an advanced player and the past. A golf swing diagnostic machine has been proposed.

[0007]

However, there is a problem that the flight distance and the launch direction cannot be measured unless there is a golf course or a practice field. Further, in evaluation of hitting point, face angle, head speed, etc., there is often no significant difference between clubs, so that there is a problem that an optimum golf club cannot be selected accurately.

Further, in the above-mentioned golf swing analyzing apparatus of Japanese Patent Laid-Open No. 10-24402, when a strain gauge is attached to the shaft, a slight change can be detected. Becomes an obstacle and you can not swing naturally, so
There is a problem that a golf club cannot be selected accurately and accurately.

Further, in the analysis by swing images of JP-A-6-210027 and JP-A-2001-112903, the torque of each joint is calculated by pointing each joint to obtain two-dimensional or three-dimensional coordinates. However, there is a problem in that the difference between clubs cannot be analyzed in detail due to problems such as measurement accuracy and image processing limitations.

Furthermore, in the methods of measuring the weight shift during a golf swing with the floor reaction force gauges of Japanese Patent Laid-Open Nos. 5-285246 and 7-250928, the purpose is swing training of golfers, which is suitable for golfers. It is not possible to quantitatively select whether the optimum club is good or bad, and since the swing check is performed by comparing multiple measurement data, data for comparison is required, and the swing can be easily measured by only one measurement. There is a problem that the quality cannot be judged.

The present invention has been made in view of the above-mentioned problems, and enables a beginner to quantitatively determine the suitability of a golf club with a simple device and operation, which is not sensory / experienced and suits oneself. It is an object to provide a golf club selection method capable of accurately and easily selecting an optimum golf club.

[0012]

In order to solve the above problems, the present invention measures locus data of a load center position of a load generated in a direction perpendicular to a horizontal plane when a golf player swings a golf club, and the locus data is measured. To provide a golf club selection method which is characterized by selecting an optimum golf club for a golfer.

As a result of diligent research, the present inventor has found that the golfer's swinging behavior changes subtly depending on the golf club used. To detect this subtle change, the golfer's swinging behavior occurs vertically in the swing. It was found that it is effective to measure the locus of the load center position of the load. As described above, by measuring the locus data of the load center position, it is possible to determine the variation of the swing and the state of weight movement at a glance.
You can easily select the most suitable club for the person by only measuring the data once. That is, even for golfers who are hard to judge for themselves whether the club is good or bad for beginners,
The optimum club can be objectively selected, and the reproducibility of the data makes it possible to judge the suitability of the golf club very accurately.

The locus data of the load center position is preferably measured using a floor reaction force meter. A floor reaction force meter is a measuring instrument that has a load cell that can measure the force perpendicular to the ground (horizontal plane) and that can calculate the trajectory of the load center position from the applied load value. It is possible to measure the load transmitted from the golfer's legs to the measuring table when swinging. As a floor reaction force meter, for example, four load cells having X, Y, Z, and 3 axes are embedded in a metal plate, and the force in the 3 axis directions applied to the plate and the center of the force are measured. The measuring instrument etc. which can do it are mentioned.

It is preferable that the trajectory data from the swing address to the finish be measured by synchronizing the trajectory data with the swing image of the golf club. By synchronizing the trajectory data with the swing image, the swing state of the golfer such as the address / impact / finish position and the trajectory data can be accurately associated, so that the determination accuracy can be further improved. In particular, if the trajectory data and the swing image can be observed simultaneously on the personal computer, the determination items can be easily calculated.

In the trajectory data during the golf club swing, the deviation between the straight line connecting the initial point of the downswing and the impact point and the actual trajectory between the initial point of the downswing and the impact point is calculated. Therefore, it is preferable to select a golf club most suitable for golfers. Specifically, in the downswing, particularly before impact, the ball is stable when the face angle of the head becomes square as long as possible. In addition, a swing using a suitable club moves the weight quickly and smoothly, so that the locus of the load center becomes linear. As described above, when the locus of the load center moves linearly, the reproducibility of the swing is higher and a stable hit ball can be obtained. That is,
The smaller the deviation value is, the more linear the trajectory is, and thus it can be determined that the golf club is the most suitable for a golfer. Therefore, by determining the value of the deviation, it is possible to quantitatively, accurately and accurately determine the suitability of the golf club.

It is preferable to select the optimum golf club for the golfer by calculating the trajectory length per unit time from impact to finish in the trajectory data during the golf club swing. In particular,
It can be seen that when the posture collapses from the impact to the finish, the weight transfer to the impact was not smooth and the swing itself was not stable. If the club is not suitable for golfers, weight transfer may not be smooth and the swing itself may be slow. For this reason, if the trajectory length per unit time is long, it is considered that the club is not suitable. That is, the smaller the value of the trajectory length per unit time is, the smoother the movement of weight is, and therefore it can be determined that the golf club is the most suitable for a golfer. Therefore, by determining the value of the trajectory length per unit time, it is possible to quantitatively, accurately and accurately determine the suitability of the golf club.

In the trajectory data during the golf club swing, the load center position at the time of address is the origin O, the end of the trajectory of the load center position at the time of backswing in the flight direction is the end point R, and the load center at the time of downswing. The end of the position trajectory in the direction of flight is defined as an end point L, a distance a between a straight line passing through the end point R and perpendicular to the direction of flight and the origin O, a straight line passing through the end point L and perpendicular to the direction of flight and the origin O And the distance b is
It is preferable to select the optimum golf club for a golfer by calculating the value of (a / b). Specifically, the ratio of the weight shift in the left and right (flying ball) direction can be obtained from the value of (a / b), and the balance between the backswing and the downswing can be known. That is, in the case of a right (left) handed golfer, it is ideal to rotate the right (left) foot around the backswing and rotate the left (right) foot around the downswing. Then, it is possible to determine that the golf club is most suitable for the golfer if the distance a and the distance b are evenly close. Therefore, by determining the value of (a / b), the suitability of the golf club can be quantitatively, accurately and easily determined. Further, the optimum ratio between the distance a and the distance b can be appropriately set depending on the standing position of the golf player.

The deviation, the length of the trajectory per unit time,
The golf club may be selected based only on the value of any one of the three determination items (a / b), but in order to make a better selection, any two or more The club selection is preferably based on all three values. Further, it is also possible to select a golf club from the above trajectory data by using a determination item other than the above three determination items.

In addition, the behavior of the golf club head immediately before the impact (face angle, loft angle), the launch angle of the ball (up / down, left / right), the spin of the ball (back, side), etc. are measured, and these evaluation results are obtained. By combining with the trajectory data, more accurate club selection can be performed.

The swinging golf club head may be a wood-type head, an iron-type head, a putter-type head, or the like, and may be any type of golf club such as a driver, an iron club, or a putter. . Further, the material, shape, etc. of the shaft, head, grip, etc. constituting the golf club are not limited, and various forms can be adopted.

[0022]

DETAILED DESCRIPTION OF THE INVENTION A first embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a floor reaction force meter 20 that measures a load center position when the golf player G swings. The floor reaction force meter 20 includes a load measuring table 21 capable of measuring a load transmitted from both legs of the golfer G to the measuring table when the golfer G swings the golf club 10, and the load measuring table 21 of the floor reaction force meter 20 includes Four load cells are arranged, a force perpendicular to the ground H (horizontal plane) can be measured, and the locus of the load center position can be calculated from the applied load value.

A high-speed camera 23 for photographing a swing image of the golfer G from the front side of the golfer G.
Is installed and the voltage signal from the floor reaction force meter 20 is input to the high-speed camera 23 as a trigger, and the trajectory of the load center position obtained and the swing image are synchronized. The trajectory of the load center position and the swing image are
Both are configured so that the personal computer 24 can perform data processing and observation.

The golf club selection method of the present invention will be described in detail. First, the golfer G swings the golf club 10 with his / her feet on the load measuring table 21 of the floor reaction force meter 20, and as shown in FIG. 2, the swing address → backswing → top → impact → followthrough → The trajectory data of the load center position of the load generated in the direction (vertical direction) perpendicular to the horizontal plane H during the golf club swing of the golf player G is measured in synchronization with the captured swing image of a series of movements up to the finish. In the present embodiment, the golf club 10 is a driver with a wood-type head attached.

Golf club 10 obtained by the above measurement
FIG. 3 shows locus data D of the load center position of the load in the vertical direction generated on the golf player G during the swing. With the address point as the origin O, the trajectory data D advances in the direction of the arrow as the swing progresses, and a downward swing initial point S, an impact point I, and a finish point F are drawn in this order.

Next, in the trajectory data D during the swing of the golf club, a straight line m (dotted line in the figure) connecting the initial point S of the downswing and the impact point I, the initial point S of the downswing and the impact point I. The deviation from the actual locus between and is calculated. Specifically, the straight line m connecting the downswing initial point S and the impact point I can be created on a personal computer, and the deviation from the actual locus is the area T of the portion surrounded by the straight line and the locus curve (in the figure). The area of the shaded area).

Further, in the trajectory data D during the swing of the golf club, the trajectory length per unit time from the impact point I to the finish point F is calculated. In particular,
Two points, impact point I and finish point F, are specified on the personal computer, the locus length from impact point I to finish point F is calculated on the personal computer, and the value of this locus length is the time taken from impact to finish. The trajectory length per unit time is obtained by dividing.

Further, in the trajectory data D during the golf club swing, the load center position at the time of address is the origin (address point) O, the end of the trajectory of the load center position at the time of backswing in the flight direction is the end point R, The end of the trajectory of the load center position during the downswing in the flight direction is defined as the end point L,
A distance a between a straight line n1 passing through the end point R and perpendicular to the flight direction and the origin O, and a straight line n2 passing through the end point L and perpendicular to the flight direction and the origin O
And the distance b is calculated as the value of (a / b). Specifically, the addresser determines the address point on the personal computer, and the coordinates of the end point R at the right end and the end point L at the left end as viewed from the right-handed golfer G are obtained to obtain the ratio of the distance a and the distance b. ing.

The above deviation, trajectory length per unit time, (a
The golfer G
The behavior of the golf club 10 during the swing is evaluated, and the optimum golf club for the golfer G is selected.

As described above, by measuring the locus data D of the load center position of the load vertically generated on the golfer G during the swing, a subtle change in the swing behavior of the golfer G can be detected. It is possible to determine at a glance the variation in weight and the state of weight shift, and it is possible to easily select the most suitable club for the person only by measuring the data once rather than comparing a plurality of data. That is, it is possible to quantitatively and objectively select the optimum club even for golfers who are difficult to judge for themselves whether the club is good or bad for beginners, and because the data reproducibility is good, it is possible to accurately judge the suitability of the golf club. You can judge.

The number of cameras, the arrangement position, the measurement accuracy, etc. are appropriately set, and the behavior (face angle, loft angle) of the swinging golf club head immediately before the impact, the launch angle of the ball (vertical, left and right), It can also be configured to measure the spin (back, side) of the ball,
A golf club can be selected by combining these evaluation results and the trajectory data. Further, swing data of various golf clubs other than the driver can be measured to select these clubs.

An embodiment of the golf club selection method of the present invention will be described in detail below. Under the conditions shown below, one golfer swings two golf clubs A (Example 1) and golf club B (Example 2) having different configurations on the measurement table of the floor reaction force meter, The locus data of the load center position was measured.

Golfer: Senior (HC8) 1 person Floor reaction force meter: Made by Kistler (4 load cells having X, Y, Z and 3 axes are embedded in a metal plate, and the load cell 3 A measuring device that can measure the axial force and the center of the applied force. Swing image: Photoron high-speed camera (sampling speed 120 frames / s, shutter speed 1/10)
00, shooting time 5 seconds) Club: A, B (A and B are both drivers)

The trajectory data D1 of the first embodiment is shown in FIG. 4, and the trajectory data D2 of the second embodiment is shown in FIG. 4 and 5, the address point O, the downswing initial point S, the impact point I, and the like are designated by the same method as in the first embodiment, and the deviation value, the trajectory length per unit time, the ( a /
The values of the three evaluation items of b) were calculated. The results are shown in Table 1 below.

[0035]

[Table 1]

Further, golfers of Examples 1 and 2 were hit with a ball by a golfer similar to the above to perform a feeling test. As a result of the test, the one having the best feeling was "5", and the one having the worst feeling was "1", and the evaluation was conducted in five levels. The evaluation of Example 1 was "5", and the evaluation of Example 2 was "3".

As shown in Table 1, when the results of the judgment items of Example 1 and Example 2 using the golf club selection method of the present invention are compared, Example 1 shows the deviation and the unit time Since the value of the trajectory length is small and the value of the a / b ratio is close to 1, it can be determined that the golf club A is suitable for the golf player of the example. Also in Example 2, the deviation and the value of the trajectory length per unit time are not so large, and the value of the ratio is not far from 1, so it can be determined that the golf club is suitable for the golfer to some extent. It was

Further, comparing Table 1 with the results of the feeling test, the evaluations are in agreement that the club A is a club having a good feeling suitable for golfers, and the club B is not optimal, but to a certain extent. The evaluations were the same because the feeling was good and it was suitable for golfers. Thus, the results of both are in agreement,
It was confirmed that the suitability of the club can be determined by the golf club selection method of the present invention.

[0039]

As is apparent from the above description, according to the present invention, by measuring the locus data of the load center position, it is possible to judge the variation of swing and the state of weight shift at a glance. You can easily select the most suitable club for the person by only measuring the data once. That is, it is possible to quantitatively and objectively select the optimum club even for golfers who are difficult to judge for themselves whether the club is good or bad for beginners, and because the data reproducibility is good, it is possible to accurately judge the suitability of the golf club. You can judge.

[Brief description of drawings]

FIG. 1 is a diagram showing a method of measuring a trajectory of a load center position of a vertical load generated on a golfer during a swing in a golf club selection method of the present invention.

FIG. 2 is a diagram showing a series of swing behaviors of a golfer.

FIG. 3 is a diagram showing trajectory data of a load center position of a vertical load generated on a golfer during a swing of a golf club in the first embodiment of the present invention.

FIG. 4 is a diagram showing trajectory data of a load center position of a vertical load generated on a golfer during a swing of a golf club in Example 1.

FIG. 5 is a diagram showing locus data of a load center position of a vertical load generated on a golfer during a swing of a golf club in Example 2.

[Explanation of symbols]

10 golf clubs 20 Floor reaction force meter 21 load measuring table 23 High-speed camera G Golfer H horizontal plane D trajectory data O address point S down swing initial point I Impact point F finish point

Claims (5)

[Claims] 1. When a golf club swings by a golfer, trajectory data of a load center position of a load generated in a direction perpendicular to a horizontal plane is measured, and the trajectory data is used to select an optimum golf club for a golfer. How to select a characteristic golf rub. 2. The golf rub selection method according to claim 1, wherein the trajectory data from the swing address to the finish is measured by synchronizing the trajectory data with a swing image of a golf club. 3. The deviation between the straight line connecting the initial point of the downswing and the impact point and the actual path between the initial point of the downswing and the impact point in the trajectory data during the golf club swing. Calculated claim 1
Alternatively, the golf lab selection method according to claim 2. 4. The golf club according to claim 1, wherein a trajectory length per unit time from impact to finish is calculated in the trajectory data during the swing of the golf club. Selection method. 5. In the trajectory data during the golf club swing, the load center position at the time of address is the origin O, the end of the trajectory of the load center position at the time of backswing in the flight direction is the end point R, and at the time of downswing. The end of the trajectory of the load center position in the direction of flight is defined as the end point L, the distance a between the origin O and a straight line passing through the end point R and perpendicular to the direction of the flight, and the end point L.
And the distance b between the origin O and a straight line passing through
The golf lab selection method according to any one of claims 1 to 4, wherein the value of (a / b) is calculated.