JPH09215807A - Golf club head swing action-measuring method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To measure swing action by setting specific points at a club head as reference points, displaying stroboscopic picture images at the time of swing ing combined with each other to detect action of each point, and analyzing action of the club head. SOLUTION: A club shaft 11 is put perpendicularly to an ideal ball flying direction to be set to correctly provide a specific real loft angle of it for supposing a plane through an axial line 11x of the club shaft 11 and perpendicular to the ball flying direction. Three plane reference points PH, Pc, Pr are set on a straight line 12 drawn by this plane on a cutting line to an upper surface of a head 10, and three side surface reference points are set on a line cutting a side surface, totalling six points. Action at the time of swinging of the head 10 is continuously photographed stroboscopically from the side surface and the plane, obtained images are combined with each other to be displayed in an image surface, and action at six points between the stroboscopically photographed images is detected, thereby action of the head 10 is analyzed.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method for measuring the behavior of a golf club head during a swing.

[0002]

2. Description of the Related Art Golf and golf clubs In order to evaluate the properties and performance of golf clubs, it is essential to observe and study the behavior when actually swinging. Because of this, already
A system has been put into practical use in which, when the golf club head is swung, continuous stroboscopic photography is performed at predetermined time intervals (for example, 500 ms), and the continuously photographed images are displayed on the screen in an overlapping manner to measure the behavior of the golf club head. However, the conventional system is swing-in outside-in,
It was limited to the determination of inside-out etc. and simple data such as head speed, and it was not enough to know more detailed behavior.

[0003]

SUMMARY OF THE INVENTION The present invention is directed to the behavior of a golf club head during swing, for example, head speed before and after impact of a plurality of parts of the head, change in face angle, change in loft angle, and position of the ball on the head face at impact. It is an object of the present invention to obtain a method capable of measuring a head speed of a hit portion, a head speed of the hit portion, a head trajectory in a plane and a side surface.

[0004]

SUMMARY OF THE INVENTION According to one aspect of the present invention, a golf club head is set with a total of 6 points, that is, a center of a side surface of the head and three points above and below, and a center of a plane and three points on the left and right as a reference point. Then, the behavior when the golf club head is swung is continuously stroboscopically photographed from the side surface and the plane and the stroboscopic images are overlapped and displayed on the screen, and the behaviors of the above six points between the respective stroboscopic images are detected. Then, the behavior of the golf club head is analyzed. Of course, each of the three reference points on the plane and the side surface can be set by using all three points as actual points.
It is also possible to set two points at both ends as actual points, and calculate and set the position of one point at the center between the two points.

The method preferably further comprises the step of inputting a unique real loft angle of the club head, and this real loft angle information and position information of three points on the side surface of the golf club head in each stroboscopic image. From this, the variable loft angle at each time can be detected. Furthermore, the change in the variable loft angle during the swing can be detected from the variable loft angle obtained from each stroboscopic image.

Similarly, it is desirable to have a step of inputting a unique reference face angle of the club head. Based on the reference face angle information and the position information of the three points of the plane of the golf club head in each stroboscopic image, respective information is obtained. The fluctuating face angle at the time point can be detected. Furthermore, it is possible to detect a change in the fluctuating face angle during a swing from the fluctuating face angle obtained from each stroboscopic image.

According to the method of the present invention, the head speeds on the toe side, the center, and the heel side can be detected from the changes in the positions of three points on the plane of the golf club head in each stroboscopic image.

Further, in the method of the present invention, the step of inputting the center origin coordinates of the plane of the ball before the impact on the screen, and the stroboscopic image, the center of the plane of the ball at the time of impact and the center of the plane of the head are determined. And a step of detecting a positional shift.

Further, in the method of the present invention, since the side image is used, the step of inputting the center origin coordinates of the side face of the ball before the impact on the screen, and the side face center of the ball at the time of impact from the strobe photographed image And a step of detecting a positional deviation between the center of the side surface of the head and the center of the side surface of the head.

According to another aspect of the present invention, the behavior of the golf club head when the golf club head is swung is continuously strobed at predetermined time intervals, and the strobed images are superposed and displayed on the screen. In the system for measuring the golf ball, the step of inputting the center origin coordinates of the plane and the side surface of the ball before the impact on the screen; the golf club head, the center of the plane and the upper and lower three points, and the center of the side surface. Step of setting a total of 6 points of the left and right 3 points as reference points; Step of inputting the positions of the above 6 points of reference points on the stroboscopic photographing screen immediately before or immediately after the ball hits the golf club head; and the center of the ball Displaying the ball hitting position on the face of the club head from the coordinates of the origin and the positions of the six reference points. It is characterized in.

In this mode, the position data of the reference point of the strobe photographed image before the head hits the ball and the strobe photographed image after the striking and the strobe photographing time interval data indicate the position where the ball hits. A step of calculating the head speed can be provided.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A swing behavior measuring method according to the present invention will be described below with reference to the drawings. 1 and 2 show examples of reference points attached to a golf club head (hereinafter referred to as a head) 10. Now, assuming that the club shaft 11 is placed at right angles to the ideal flight line direction and is set so that its unique real loft angle is accurately obtained, a plane passing through the axis line 11x of the club shaft 11 and orthogonal to the flight direction is assumed. To do. Draw straight lines 12 and 13 on the planes that cut the upper surface and the side surfaces of the head 10, respectively, and
3 parallel lines 12a, 12b, 12 parallel to each other
c, 13a, 13b, 13c are drawn, and as plane reference points, P _H (heel), P _C (center), P _T (toe)
And S _U (top), S _C (center), and S _D (bottom) are formed as side reference points. The intersection of the plane orthogonal projection of the reference point P _C and the side orthogonal projection of S _C on the face surface 10a is approximately matched with the sweet spot on the face surface 10a.

These six reference points in total can be arbitrarily set if the positional relationship with the face surface 10a can be accurately grasped, but if set as described above, the face surface 10a of the head 10 can be set. The angle α formed by the straight line 12 can be set as the reference face angle, and the angle β formed by the straight line 13 can be set as the real loft angle. The reference face angle α and the real loft angle β are values unique to each head 10. Although these reference points may be drawn directly on the head 10, they can be formed by attaching an E-shaped tape body to the measured head 10. Of course, it may be drawn as a simple spot, but drawing as an intersection of straight lines has the advantage of being easy to see on the screen.

Next, FIGS. 5 and 6 show examples of three peripheral lines 21 drawn on the ball 20 hit by the head 10. The circumferential line 21 is drawn on the maximum diameter portion of the ball 20 in a relationship orthogonal to each other. When placed on the tee 22, one cross wire portion 21x is located at the center when viewed from the plane and is separated when viewed from the side. The cross line portion 21y is positioned at the center, and one of the pair of peripheral lines 21 forming the cross line is set so as to face the flight direction (generally horizontal direction).
FIG. 12 shows a perspective view of the club head 10 and the ball 20.

FIG. 3 conceptually shows a continuous infrared strobe photographing apparatus. A horizontal TV camera (imaging device) 30H and an infrared strobe continuous light emitter 31 are located on the side of the tee 22, and a vertical TV camera (imaging device) 30V is located on the upper part. The infrared strobe continuous light emitter 31 has an adjustable predetermined precise time interval (for example, 200 to 600 ms).
It continuously emits infrared light with a horizontal TV camera 30H.
And the vertical TV camera 30V is sensitive to infrared light.
The TV cameras 30H and 30V, for example, start imaging in a bulb state in synchronization with the first light emission of the infrared strobe continuous light emitter 31 and end after a predetermined time. Alternatively, the number of flashes is taken in synchronization with the flash firing and the images are overlaid on a personal computer. In any case, if the infrared strobe continuous light-emitting device 31 is continuously made to emit light during a swing, a plurality of stroboscopic images at the time of that light emission are overlapped, and the specific image pickup method is not shown. Display 33 schematically shown
Displayed on the screen.

In FIG. 4, a plane image is displayed in the upper half of the screen and a side image is displayed in the lower half. 4 and 10 show
The signal processing system is shown, and image signals from the horizontal TV camera 30H and the vertical TV camera 30V are input to the CPU 35 via the image input means 34. A keyboard 36 and a mouse (screen input means) 37 are connected to the CPU 35, and the display 33 is an image input / output means 3.
It is connected to the display 33 via 8. The keyboard 36 is used for inputting specific values such as measurement date / time, temperature, humidity, reference face angle α, real loft angle β, and the like, which are unique to the measured club. The mouse 37 gives the CPU 35 position information on the screen of the point touched on the screen of the display 33 by moving the pointer 37a on the screen and clicking. FIG. 11 shows an example of the pointer 37a, and the center of the crosshair is the space 37b. Since the pointer 37a can match the space 37b with the reference point, the position of the reference point can be accurately input. A light pen or the like may be used instead of the mouse.

The method of the present invention measures the swing behavior by the apparatus having the above-mentioned structure as follows. First, the scale is set on the screen of the display 33. To set the scale, use the mouse 3
It is a setting for inputting at 7 and converting to the length on the screen. Since the horizontal TV camera 30H and the vertical TV camera 30V are separate cameras, this scale setting is performed for each of the plane image and the side image in principle. Next, the center of the plane of the ball 20 placed on the tee 22 (cross line portion) 2
Enter 1x and the position of the center of the side surface (crosshair part 21y),
An XY coordinate system whose origin is the intersection of the two is constructed. Since the diameter of the ball 20 is known, the side surface center of the origin coordinates can be set by previously inputting the height of the tee 22. Also, the center of the plane is Tee 2.
If the position of 2 is fixed, it is possible to input from the position of the tee 22. Further, the required data including the reference face angle α and the real loft angle β of the measured head 10 are input via the keyboard 36.

After the above initial setting, the club shaft 11
A golfer with a swing actually swings and hits the ball 20. Before and after this collision, the infrared strobe continuous light emitter 31 is driven to drive the horizontal TV camera 30H and the vertical TV.
When the camera 30V is operated to take an image, the display 3
In FIG. 3, the continuous stroboscopic shot images schematically shown in FIGS. 7 and 8 are obtained. In this embodiment, the trigger timing and the light emission interval of the infrared strobe continuous light emitter 31 are set so that the strobe light is emitted twice before striking and three times after. In order to accurately know the behavior of the club head before and after the ball hit, it is desirable that the stroboscopic light emission images are displayed on the screen at least five times in this manner.
In FIGS. 7 and 8, the head 1
0, the plane reference points P _H , P _C , P _T , and the side reference points S _U , S _C , S _D are respectively suffixed with 1 to 5.

Next, on the display 33, the positional information of these plane reference points and side reference points is input via the mouse 37. From this position information, it is possible to know at which point in the swing each reference point was located. Since the shooting interval of each stroboscopically shot image is constant (for example, 500 ms), each reference point is
If the distance moved within this fixed time is calculated, the speed of each reference point can be calculated. That is, to obtain changes in the toe, center, heel, upper, center, and lower head speeds between the respective movement sections (strobe photographing screens) of the head 10, and the head speed changes at these points before and after hitting the ball 20. You can Further, since the inclinations of the straight lines 12 and 13 can be known from the position information of each reference point, the variable loft angle at each swing position can be obtained by adding the reference face angle α and the real loft angle β unique to the measured head 10. It is possible to know the fluctuating face angle and how the fluctuating loft angle and the fluctuating face angle change. The angle formed by the face surface with the horizontal plane during the swing is defined as the variable loft angle, and the angle formed by the vertical surface is defined as the variable face angle. Further, the movement locus (trajectory) of the head 10 on the plane and the side can be digitized and obtained from the variation position data between the plane reference point and the side reference point.

Further, since the position of the ball 20 is input as the origin coordinate, by using the stroboscopic image of the head 10 before and after hitting the ball 20,
It is also possible to detect the position where the ball hits the face surface 10a. For this purpose, position data obtained by strobing images of the head 10 once before and immediately after hitting the ball are used, and it is assumed that each reference point moves in a straight line or a specific curve between these images. By doing so, it is possible to know where on the face surface 10a of the head 10 that has moved along the virtual straight line or curved line, the ball 20 has abutted. FIG. 9 shows the center of the ball 20 (origin)
And the position 39 on the face surface 10a where the ball 20 hits
The display example of is shown. Further, it is possible to calculate the head speed of the face surface 10a where the ball hits. In this calculation, for example, since the moving speeds of the toe and heel are known on a plane, the moving speed may be proportionally distributed according to the distance from the toe and heel of the hit portion. The side face can also be calculated by the same calculation.

[0021]

According to the swing behavior measuring method of the present invention, the behavior of the golf club head, for example, the head speed before and after the impact of a plurality of parts of the head, the change of the face angle, the change of the loft angle, the head face at the time of impact. It is possible to measure the position of the ball hit by the ball, the head speed of the hit part, and the head orbit of the plane and the side surface. These data can be used for golf club trial manufacture, design, simulation golf, etc. in addition to finding the problems of golfers, as well as measuring the behavior of the ball. More specifically, the swing robot changes the impact position when swinging the same swing while changing the club shaft, and the impact position when swinging club shafts of the same lot in the same swing. It is possible to check the characteristics of the shaft, variations in manufacturing, etc. by detecting the above.

[Brief description of the drawings]

FIG. 1 is a plan view showing an example of a plane reference point of a club head used in a swing behavior measuring method according to the present invention.

FIG. 2 is a side view showing an example of the same side reference point.

FIG. 3 is a conceptual diagram of a swing continuous stroboscopic imaging device.

FIG. 4 is a diagram showing a connection example of a hardware configuration for carrying out the method of the present invention.

FIG. 5 is a side view of the ball set on the tee.

FIG. 6 is a plan view of the same.

FIG. 7 is a diagram illustrating a processing example using a plane reference point.

FIG. 8 is a diagram showing an example of processing by a side reference point.

FIG. 9 is a diagram showing an example of a display that displays where on the club face the ball has hit.

FIG. 10 is a block diagram showing a processing procedure of the method of the present invention.

FIG. 11 is a diagram showing a specific example of a pointer for inputting the position of a reference point on the screen.

FIG. 12 is a perspective view of a club head with reference points and a ball with a perimeter line.

[Explanation of symbols]

Plane reference point P _H P _C P _T Side reference point S _H S _C S _D 10 Head 11 Club shaft 20 Ball 21 Circumference 22 Tee 30H 30V TV camera (imaging device) 31 Infrared continuous light emitter 33 Display 34 Image input Means 35 CPU 36 Keyboard 37 Mouse (screen input means) 37a Pointer 38 Image input / output means

Claims (10)

[Claims] 1. A step of setting, on a golf club head, a total of 6 points, that is, a center of a side surface, three points above and below, and a center of a plane and three points on the left and right, as reference points; the golf club head is swung. A step of continuously stroboscopically photographing the behavior at this time from the side surface and the plane and superimposing the respective stroboscopically photographed images on the screen; and detecting the behavior of the above six points between the stroboscopically photographed images, A method of measuring swing behavior of a golf club head, comprising: analyzing the behavior. 2. The method according to claim 1, further comprising the step of inputting a peculiar real loft angle of the club head, the real loft angle information and position information of three points on the side surface of the golf club head in each stroboscopic image. Swing behavior measurement method to detect the variable loft angle at each time. 3. The swing behavior measuring method according to claim 4, wherein a change in the variable loft angle during a swing is detected from the variable loft angle obtained from each stroboscopic image. 4. The method according to claim 1, further comprising the step of inputting a unique reference face angle of the club head, and the reference face angle information and position information of three points on the plane of the golf club head in each stroboscopic image. A method for measuring the swing behavior of the golf club head, which detects the variable face angle at each time point. 5. The swing behavior measuring method according to claim 4, wherein a change in the variable loft angle during a swing is detected from the variable loft angle obtained from each stroboscopic image. 6. The swing behavior measuring method according to claim 1, wherein head speeds on the toe side, the center, and the heel side are detected from changes in the positions of three points on the plane of the golf club head in each stroboscopic image. 7. The method according to claim 1, further comprising the step of inputting the center origin coordinates of the plane of the ball before the impact on the screen, and the center of the plane of the ball and the plane of the head at the time of impact from the stroboscopic image. And a step of detecting a positional deviation from the center. 8. The method according to claim 1, further comprising the step of inputting the center origin coordinates of the side surface of the ball before the hit on the screen, and the center of the side surface of the ball at the time of the ball hit and the side surface of the head from the stroboscopic image. And a step of detecting a positional deviation from the center. 9. A system for measuring the behavior of a golf club head by continuously stroboscopically photographing the behavior when the golf club head is swung at predetermined time intervals and superimposing the stroboscopically photographed images on the screen. In the step of inputting the center origin coordinates of the plane and side surface of the ball before hitting, the golf club head has a total of 6 points including the center of the plane and three points above and below, and the center of the side surface and three points on the left and right sides. As a reference point; a step of inputting the positions of the above-mentioned 6 reference points on the stroboscopic photographing screen immediately before or after the ball hits the golf club head; Of the golf club head, the step of displaying the ball hitting position on the face of the club head from the position of the reference point of Behavior measurement method. 10. The ball is hit based on the position data of the respective reference points in the strobe photographed image before the head hits the ball and the strobe photographed image after the head hits, and the strobe photographing time interval data. A swing behavior measuring method further comprising the step of calculating a head speed at a different place.