JP2021058302A - Golf swing analysis device - Google Patents

Abstract

To provide a golf swing analysis device that allows characteristics of a golfer to be grasped more appropriately.SOLUTION: A golf swing analysis device includes an acquisition part for acquiring measurement data obtained by measuring a golf club swing action of a golfer with a measuring device, a classification part for classifying rotation types, which are types on timings of the face rotation of the golfer, on the basis of the measurement data, and an image creation part for creating a screen for displaying the rotation types of the golfer.SELECTED DRAWING: Figure 6

Description

The present invention relates to a golf swing analyzer and a program for analyzing the swing motion of a golf club by a golfer, and a golf club fitting method using the same.

Conventionally, various methods (for example, Patent Document 1 and the like) have been proposed in which the swing motion of a golf club by a golfer is measured by a measuring device and the characteristics of the golfer are analyzed based on the measurement data at this time. The analysis result of such a golf swing can be used for various purposes such as selecting a golf club suitable for a golfer (so-called fitting) and improving a shot by a golfer.

JP-A-2017-217423

By the way, the timing of face rotation performed during a golf swing is different for each person. Therefore, accurately grasping the type of golfer's face rotation timing can contribute to more appropriately grasping the characteristics of the golfer.

An object of the present invention is to provide a golf swing analyzer and a program that make it possible to more appropriately grasp the characteristics of a golfer, and a golf club fitting method using the same.

The golf swing analyzer according to the first aspect is a type related to the acquisition unit that acquires the measurement data obtained by measuring the swing motion of the golf club by the golfer with the measuring device, and the timing of the face rotation of the golfer based on the measurement data. A classification unit for classifying a certain rotation type and a screen creation unit for creating a screen for displaying the rotation type of the golfer are provided.

The golf swing analyzer according to the second aspect is the golf swing analyzer according to the first aspect, and the classification unit determines the magnitude of the movement of the golfer pulling the golf club immediately before impact based on the measurement data. A first index indicating the above is calculated, and the rotation type of the golfer is classified according to the size of the first index.

The golf swing analysis device according to the third aspect is the golf swing analysis device according to the second aspect, and the screen creation unit is in a region having an axis representing the first index, based on the measurement data. Create a screen that displays a graph that plots the values of one index.

The golf swing analyzer according to the fourth aspect is the golf swing analyzer according to the second aspect, and the classification unit determines the movement of the golfer pushing the golf club during the downswing based on the measurement data. A second index indicating the size is further calculated, and the rotation type of the golfer is classified according to the first index and the second index.

The golf swing analyzer according to the fifth aspect is the golf swing analyzer according to the fourth aspect, and the screen creation unit is in a region having an axis representing the first index and an axis representing the second index. , Create a screen for displaying a graph plotting the values of the first index and the second index based on the measurement data.

The golf swing analyzer according to the sixth viewpoint is a golf swing analyzer according to any one of the first to fifth viewpoints, and the classification unit performs face rotation of the golfer's rotation type immediately before impact. Classify from multiple types including types.

The golf swing analyzer according to the seventh aspect is the golf swing analyzer according to the sixth aspect, and the plurality of types further include a type that performs face rotation in the entire downswing.

The golf swing analysis program according to the eighth aspect causes a computer to execute the following.
-Acquiring measurement data obtained by measuring the swing motion of a golf club by a golfer with a measuring device-Classifying a rotation type that is a type related to the timing of face rotation of the golfer based on the measurement data-Rotation of the golfer Creating a screen to display the type

The fitting method according to the ninth aspect includes the following.
-Displaying the screen using the golf swing analyzer according to any one of the first to seventh viewpoints-Golf suitable for the golfer according to the rotation type of the golfer displayed on the screen. Determine the balance of the club and recommend the balance to the golfer

Based on the above viewpoint, the types related to the timing of the golfer's face rotation are classified based on the measurement data obtained by measuring the swing motion of the golf club by the golfer, and a screen for displaying the types is created. The user who sees this screen knows the type of golfer's face rotation timing and can more appropriately grasp the characteristics of the golfer.

The figure which shows the analysis system which includes the golf swing analysis apparatus which concerns on 1st Embodiment. The functional block diagram of the analysis system which concerns on 1st Embodiment. The flowchart which shows the flow of the analysis process which concerns on 1st Embodiment. The figure explaining the index for classifying the rotation type which concerns on 1st Embodiment. The figure explaining another index for classifying the rotation type which concerns on 1st Embodiment. The graph which shows the relationship between the index and the rotation type for classifying the rotation type which concerns on 1st Embodiment. The figure which shows the result screen which concerns on 1st Embodiment. A graph summarizing the relationship between two indexes and the optimum balance in order to classify the rotation type according to the first embodiment when a large number of golfers actually hit a golf club. The figure which shows the analysis system which includes the golf swing analysis apparatus which concerns on 2nd Embodiment. The functional block diagram of the analysis system which concerns on 2nd Embodiment. The figure explaining the index for classifying the rotation type which concerns on 2nd Embodiment. The figure which shows the result screen which concerns on 2nd Embodiment. A table summarizing the relationship between the index and the optimum balance for classifying the rotation type according to the second embodiment when a large number of golfers actually hit a golf club.

Hereinafter, a golf swing analyzer and a program according to some embodiments of the present invention, and a golf club fitting method using the same will be described with reference to the drawings.

<1. First Embodiment>
<1-1. Outline configuration of golf swing analyzer>
1 and 2 show the overall configuration of the analysis system 100 including the golf swing analysis device 2 according to the present embodiment. The golf swing analyzer 2 is an apparatus for analyzing the characteristics of the golfer G based on the measurement data obtained by measuring the state in which the golfer G swings the golf club 4 for testing (hereinafter referred to as a test club) 4. The test club 4 is a general golf club, and includes a shaft 40, a head 41 provided at one end of the shaft 40, and a grip 42 provided at the other end of the shaft 40. In the present embodiment, the measuring device that measures the swing motion is the inertial sensor unit 1. The golf swing analysis device 2 constitutes an analysis system 100 together with the inertial sensor unit 1.

The golf swing analyzer 2 analyzes the rotation type, which is a type related to the timing of the face rotation of the golfer G, as a characteristic of the golfer G. The face rotation means that the golfer G rotates the face surface 41a by opening and closing the face surface 41a of the head 41 during the swing operation.

In the present embodiment, the analysis result regarding the rotation type of the golfer G is used for the purpose of fitting the golf club to the golfer G, and in particular, a golf club having a balance suitable for the golfer (hereinafter, may be referred to as an optimum balance) is selected. Used to do. The balance, also called a swing weight, is an index showing the weight feeling of the head when swinging a golf club, and affects the swing comfort. Generally, the balance is represented by a combination of the alphabets A to E and the numbers 0-9, with "A0" being the lightest and "E9" being the heaviest. A "heavy" balance can mean that the center of gravity of the golf club is closer to the head side, making it easier to feel the resistance of the head when swinging the golf club, and thus making it more difficult to swing. On the contrary, "light" balance can mean that the center of gravity of the golf club is closer to the grip side, the resistance of the head is less likely to be felt when swinging the golf club, and therefore it is easier to swing. In the present embodiment, the above balance is taken into consideration, and it becomes possible to provide the golf club with the optimum swinging comfort for the golfer G.

Hereinafter, the configurations of the inertial sensor unit 1 and the golf swing analyzer 2 will be described, and then the fitting method realized by using the analysis system 100 will be described.

<1-2. Composition of each part>
<1-2-1. Inertia sensor unit configuration>
As shown in FIG. 1, the inertial sensor unit 1 is attached to the end of the grip 42 of the test club 4 opposite to the head 41, and measures the behavior of the grip 42. The inertial sensor unit 1 is compact and lightweight so as not to interfere with the swing operation. The inertial sensor unit 1 can be detachably configured with respect to the test club 4.

As shown in FIG. 2, the inertial sensor unit 1 is equipped with an acceleration sensor 11, an angular velocity sensor 12, and a geomagnetic sensor 13. Further, the inertial sensor unit 1 is also equipped with a communication device 10 for transmitting measurement data output from these sensors 11 to 13 to an external golf swing analyzer 2. In the present embodiment, the communication device 10 is wireless so as not to interfere with the swing operation, but may be connected to the golf swing analyzer 2 by wire via a cable.

The acceleration sensor 11, the angular velocity sensor 12, and the geomagnetic sensor 13 measure acceleration, angular velocity, and geomagnetism in the xyz local coordinate system with the mounting positions of these sensors 11 to 13 as the origin, respectively. More specifically, the acceleration sensor 11 measures _{accelerations a x} , a _y , a _z in the x-axis, y-axis, and z-axis directions. The angular velocity sensor 12 measures _{the angular velocities ω x} , ω _y , and ω _z around the x-axis, y-axis, and z-axis. Geomagnetic sensor 13 measures the x-axis, y-axis and z-axis direction terrestrial magnetism m _x, m _y, a m _z. These measurement data are collected as time-series data from at least the address to the finish in a predetermined sampling cycle Δt, and are transmitted to the golf swing analyzer 2 via the communication device 10. The xyz local coordinate system is a three-axis Cartesian coordinate system, and the z-axis is oriented substantially parallel to the shaft 40. The x-axis is oriented as parallel as possible to the toe-heel direction of the head 41, and the y-axis is oriented as parallel as possible to the normal direction of the face surface of the head 41.

<1-2-2. Configuration of golf swing analyzer>
The golf swing analyzer 2 is a general-purpose computer as hardware, and is realized as, for example, a desktop computer, a notebook computer, a tablet computer, a smartphone, or the like. As shown in FIG. 2, the golf swing analyzer 2 is manufactured by installing the analysis program 3 according to the present embodiment on a general-purpose computer. The analysis program 3 is transferred to the golf swing analyzer 2 from a computer-readable recording medium 20 such as a CD-ROM, or via a communication network such as a local area network (LAN) or the Internet connected to the communication unit 25. To be acquired. The analysis program 3 is software for analyzing the rotation type of the golfer G based on the measurement data transmitted from the inertial sensor unit 1. The analysis program 3 causes the golf swing analyzer 2 to execute an operation described later.

The golf swing analyzer 2 includes a display unit 21, an input unit 22, a storage unit 23, a control unit 24, and a communication unit 25. These units 21 to 25 are connected via a bus line 26 and can communicate with each other. In the present embodiment, the display unit 21 is composed of a liquid crystal display or the like, and displays information described later to the user. The term "user" as used herein is a general term for golfer G himself, his instructor, a golf club salesperson, and other persons who need the analysis results here. The input unit 22 can be composed of a mouse, a keyboard, a touch panel, and the like, and receives an operation from the user on the golf swing analyzer 2. The communication unit 25 is a communication interface that enables communication between the golf swing analyzer 2 and the external device, and receives measurement data from the inertial sensor unit 1.

The storage unit 23 is composed of a non-volatile storage device such as a hard disk. The analysis program 3 is stored in the storage unit 23, and measurement data transmitted from the inertial sensor unit 1 is stored.

The control unit 24 can be composed of a CPU, a ROM, a RAM, and the like. The control unit 24 virtually operates as the acquisition unit 24A, the classification unit 24B, and the screen creation unit 24C by reading and executing the analysis program 3 in the storage unit 23. Details of the operation of each part 24A to 24C will be described later.

<1-3. Fitting method ＞
Subsequently, the analysis process executed by the analysis system 100 and the fitting method based on the analysis result will be described.

The analysis process according to this embodiment proceeds as shown in FIG. First, in step S1, measurement data is collected. More specifically, the golfer G swings the test club 4 to which the inertial sensor unit 1 is attached and hits the ball. In this case, the inertial sensor unit 1 includes an acceleration a _x between at least the address to the finish, a _y, a _z, the angular velocity ω _x, ω _y, ω _z and geomagnetism m _x, m _y, time-series data of m _z To measure. This time-series data is transmitted to the golf swing analyzer 2 via the communication device 10 as measurement data for measuring the swing motion of the test club 4 by the golfer G. On the other hand, on the golf swing analyzer 2 side, the acquisition unit 24A acquires this measurement data via the communication unit 25 and stores it in the storage unit 23.

In the following step S2, the classification unit 24B is an index representing the characteristics of the swing motion of the golfer G based on the measurement data stored in the storage unit 23, and serves as a reference for classifying the rotation type of the golfer G. The predetermined indicators C ₁₁ and C ₁₂ are calculated. It should be noted that there is a tendency for each person to perform face rotation during the swing operation. The rotation type is a type that classifies the characteristics of the golfer G regarding the timing of face rotation during the swing operation. The indexes C ₁₁ and C ₁₂ are both indexes representing the amount of change in posture including the degree of opening of the face surface 41a of the head 41 during the swing operation, and are defined as follows in the present embodiment.

Here, ω _z _ _imp is the angular velocity ω _z at the timing of impact, and ω _z _ _top is the angular velocity ω _z at the timing of the top. The integral included in C ₁₂ represents the integral from the top timing to the impact timing. 4A and 4B are diagrams illustrating indicators C ₁₁ and C _{12 using actually measured graphs of ω z} and ω _x . The indexes C ₁₁ and C ₁₂ can be calculated based on the data of the _{angular velocities ω x} and ω _z included in the measurement data as defined.

In the following step S3, the classification unit 24B classifies the rotation type of the golfer G according to the magnitudes _{of the indicators C 11} and C _12. In the present embodiment, the golfer G rotation type includes a type that performs face rotation immediately before impact (hereinafter, may be referred to as impact rotation type) and a type that performs face rotation for the entire downswing (hereinafter, referred to as total rotation type). There is) and it is classified from two types.

Here, as shown in FIG. 4A, the index C ₁₁ indicates the magnitude of the amount of change in _{the angular velocity ω z} around the axis substantially parallel to the extending direction of the shaft 40 between the top and the impact. This substantially indicates the magnitude of the movement of the golfer G pulling the test club 4 toward his / her body immediately before the impact during the downswing. Alternatively, it can be said to indicate the amount of face rotation immediately before impact. Therefore, it can be said that the larger the value of the index C _11, the easier it is for the golfer G to correspond to the impact rotation type, and the _{smaller the value of the index C 11} , the easier it is to correspond to the total rotation type.

On the other hand, the index C ₁₂ shows the cumulative value of the amount of change in _{the angular velocity ω x} around the axis substantially parallel to the toe-heel direction between the top and the impact, as shown in FIG. 4B. This substantially indicates the magnitude of the movement in which the golfer G pushes the test club 4 in the swing direction (rotational direction around the shoulder) during the downswing. Alternatively, it can be said to indicate the amount of face rotation throughout the downswing. Therefore, it can be said that the larger the value of the index C _12, the easier it is for the golfer G to correspond to the total rotation type, and the _{smaller the value of the index C 12} , the easier it is to correspond to the impact rotation type.

From the above, as shown in FIG. 5, _{when considering a plane centered on the indexes C 11} and C ₁₂ , the region corresponding to the impact rotation type and the region corresponding to the total rotation type are predetermined in the same plane. The straight line L1 can be divided as a boundary line. The straight line L1 is a straight line having a slope so that the larger the value of one of _{the indexes C 11} and C _{12, the larger the value of the other.}

In step S3, the classifying unit 24B sets the value of the index C ₁₁ and C ₁₂ calculated in step S2, the two indices C ₁₁ and C ₁₂ are plotted in a plane whose axes, the point plotted, the plane It is determined which region is divided by the predetermined boundary line (see L1 in FIG. 5). Then, the rotation type previously associated with the area to which the plotted points belong is determined as the rotation type of the golfer G.

In the following step S4, the above analysis result is displayed to the user. More specifically, the screen creation unit 24C creates a result screen W1 (see FIG. 6) and displays it on the display unit 21. The rotation type of golfer G is displayed on the result screen W1. Although not limited to this, in the example of FIG. 6, as shown in D2, a plurality of objects corresponding to the plurality of candidate rotation types are displayed, and the corresponding objects are colored. Each of these objects is given a letter indicating the name of the corresponding rotation type. In the example of FIG. 6, as shown in D3, a description of the corresponding rotation type is also displayed. Therefore, the user who sees the result screen W1 can appropriately grasp the characteristics of the golfer G.

Further, on the result screen W1, as shown in D1, a graph area D11 having an axis representing _{the indexes C 11} and C _{12 for classifying the rotation type is displayed.} In the graph area D11, a point D12 in which the values of _{the indexes C 11} and C _{12 calculated in step S2 are plotted is displayed.} Further, as an explanation of the axes of the graph area D11, the meanings _{of the indexes C 11} and C _{12 are displayed so that the user can easily understand them.} In the example of FIG. 6, "movement of pulling a club" is displayed as an explanation of _{index C 11} corresponding to the vertical axis, and "movement of pushing a club" is displayed as an explanation of _{index C 12 corresponding to the horizontal axis.} .. Therefore, the user who sees the result screen W1 can know not only the rotation type of the golfer G but also the characteristics of the golfer G which is the reason for being classified into the rotation type. In the example of FIG. 6, it is possible to know the characteristics of the golfer G regarding the magnitude of the movement of pulling and pushing the golf club during the swing operation, and as a result of such characteristics, how the face rotation is performed. Can be grasped.

In the present embodiment, the golfer G rotation type information displayed on the result screen W1 is used for fitting a golf club suitable for the golfer G. According to the findings obtained by the present inventors, the balance (optimal balance) of the golf club suitable for the golfer G depends on the rotation type of the golfer G. Therefore, the user confirms the rotation type of the golfer G on the result screen W1 and determines the optimum balance accordingly. In addition, the user can identify a golf club having an optimum balance by referring to a catalog or the like. At this time, the user may specify the grip to be used for a specific golf club from a catalog or the like in order to achieve the optimum balance. Alternatively, the weight to be attached to the grip or head of a specific golf club or the weight thereof may be specified from a catalog or the like. When the user is a golf club salesperson, an instructor, or the like, such a golf club, grip, weight, or weight thereof can be recommended to the golfer G.

The present inventors have confirmed by the following experiments that the optimum balance depends on the rotation type of golfer G. More specifically, this experiment confirmed that the _{optimal balance depends on the indicators C 11} and C _{12 for classifying rotation types.} First, the present inventors had 23 subjects try out two golf clubs with different balances. Of the two golf clubs, one is a golf club with a balance of "D5" (hereinafter sometimes referred to as a normal club), and the other is a golf club with a lighter balance and a balance of "D2". It was a golf club (hereinafter sometimes referred to as a light balance club). The head and shaft are common to the normal club and the light balance club, and a light balance club is prepared by changing the grip of the normal club to a heavier grip.

_{In addition, the present inventors calculated indexes C 11} and C ₁₂ when each of the 23 subjects tried to hit a normal club by the same measuring equipment and measuring method as described above. In addition, for each of the 23 subjects, of the above two golf clubs, the club with the better shot result was identified. The quality of the shot result was evaluated comprehensively by observing the flight distance and directionality (left-right blur). FIG. 7 is a graph summarizing the results. From the experimental results shown in the graph, the golfer index C ₁₁ is small, normally has club better suited to golfers index C ₁₁ is large, a tendency that light balance clubs are more suitable was confirmed .. Furthermore, the golfer small indicator C _12, and light balance club better suited to golfers larger index C _12, a tendency that normal club is more suitable was confirmed. However, although the indexes C ₁₁ and C ₁₂ both represent the amount of change in the opening degree of the face surface 41a during the swing operation, ω _z is more dominant than the opening degree of the face surface 41a _{than ω x.} Is. As a result, it is considered that the above tendency appears more strongly _{in the index C 11} than in the index C _12.

As a result of the above, as shown in FIG. 7, _{the region centered on the indicators C 11} and C ₁₂ is divided into a region where the normal club fits and a region where the light balance club fits by the linear boundary line L2. I found out. In FIG. 7, the results that deviate from the above tendency are circled. According to the results of this experiment, the above tendency appeared in 21 out of 23 persons, that is, with a probability of 91% or more. Therefore, it was found that the optimum balance can be determined if the amount of change in the opening degree of the face surface 41a during the swing operation as defined by the indexes C ₁₁ and C _{12 is known.}

By setting the boundary line L1 for classifying the above-mentioned rotation type to match the boundary line L2 for classifying such an optimum balance, the optimum balance can be appropriately adjusted according to the rotation type. It becomes possible to classify. In the present embodiment, the above-mentioned experiment is repeated for a large number of subjects in advance to identify the highly accurate boundary line L2, which is stored in the storage unit 23 as the boundary line L1. Then, the classification of step S3 is realized by referring to the information that identifies such a boundary line L1 in the storage unit 23.

<2. Second Embodiment>
8 and 9 show the overall configuration of the analysis system 200 having the golf swing analysis device 102 according to the second embodiment. The main difference between the first embodiment and the second embodiment is that the index as a reference for classifying the rotation type of golfer G is different. Further, the configuration of the measuring device for measuring the measurement data for calculating such an index is also different. Hereinafter, the description of the common points with the first embodiment will be omitted, and the second embodiment will be described focusing on the differences between the two embodiments.

In the second embodiment, the measuring device that measures the swing motion is the camera system 5. The camera system 5 is installed in a turn at bat where the golfer G makes a trial hit at a specialized place such as a golf equipment store or a golf school, and measures the swing motion of the golfer G standing in the turn at bat. As shown in FIGS. 8 and 9, the camera system 5 includes a plurality of cameras 51 and 52 and a plurality of strobes 53, 53, 54 and 54, and performs strobe-type shooting. The camera 51 is fixed to the support base 57 on the front side of the golfer G so that the state of the head 41 and the ball 60 before and after the impact can be photographed from above, and is arranged diagonally above the ball 60 at the time of addressing. There is. The strobes 53 and 53 are also fixed to the support base 57 and are arranged below the camera 51. Further, the camera 52 is arranged in front of the ball 60 at the time of addressing on the front side of the golfer G so that the state of the head 41 and the ball 60 before and after the impact can be photographed from a position different from that of the camera 51. The strobes 54 and 54 are arranged on the left and right sides of the camera 52. The head 41 and the ball 60 are appropriately provided with markers having a shape such as a dot or a line so that the behavior of the head 41 and the ball 60 can be easily extracted from the image data taken by the cameras 51 and 52. ing.

Further, the camera system 5 includes floodlights 55A and 55B and receivers 56A and 56B, the floodlight 55A and the receiver 56A constitute one timing sensor, and the floodlight 55B and the receiver 56B have another timing. It constitutes a sensor. The timing signals generated by these timing sensors are used to determine the timing of light emission of strobes 53, 53, 54 and 54 and subsequent shooting of cameras 51 and 52.

Further, the camera system 5 also includes a control device 50 for controlling the operation of the above devices 51 to 56B. The control device 50 has a CPU, a ROM, a RAM, and the like, and is connected to the communication unit 25 of the golf swing analyzer 102 in addition to the above devices 51 to 56B.

The floodlights 55A and 55B are arranged below the camera 51 near the ground on the front side of the golfer G. On the other hand, the receivers 56A and 56B are arranged near the toes of the golfer G's foot. The floodlight 55A and the receiver 56A are arranged on a straight line substantially parallel to the direction from the back to the abdomen of the golfer G, and face each other (see FIG. 8). The same applies to the floodlight 55B and the receiver 56B. The floodlights 55A and 55B constantly irradiate the light receivers 56A and 56B, respectively, during the swing operation by the golfer G, and the light receivers 56A and 56B receive the light. However, at the timing when the test club 4 passes between the floodlights 55A and 55B and the receivers 56A and 56B, the light from the floodlights 55A and 55B is blocked by the test club 4, so that the receivers 56A and 56B receive the light. Can not do it. The receivers 56A and 56B detect this timing and generate a timing signal in response to this timing. The control device 50 commands the strobes 53, 53, 54, and 54 to emit light and commands the cameras 51 and 52 to shoot at a predetermined timing based on the time when the timing signal is generated. The measurement data in the form of image data captured by the cameras 51 and 52 is transmitted to the control device 50, and is further transmitted from the control device 50 to the golf swing analyzer 102.

The analysis process according to the second embodiment also proceeds as shown in FIG. 3, similarly to the first embodiment. First, in step S1, measurement data is collected. More specifically, the golfer G stands in the turn at bat where the camera system 5 is introduced, swings the test club 4, and hits the ball 60. At this time, the camera system 5 captures image data showing the state of the vicinity of the head 41 and the ball 60 before and after the impact. This image data is transmitted to the golf swing analyzer 102 via the control device 50 as measurement data for measuring the swing motion of the test club 4 by the golfer G. On the other hand, on the golf swing analyzer 102 side, the acquisition unit 24A acquires the measurement data via the communication unit 25 and stores it in the storage unit 23.

In the following step S2, the classification unit 24B calculates an _{index C 13} as a reference for classifying the rotation type of the golfer G based on the measurement data stored in the storage unit 23. The index C ₁₃ is defined as the amount of change in the opening degree of the face surface 41a during the swing operation, and in particular, is defined as the amount of change in the opening degree of the face surface 41a immediately before the impact. Therefore, the _{larger the value of the index C 13,} the easier it is for the golfer G to correspond to the impact rotation type, and the _{smaller the value of the index C 13} , the easier it is to correspond to the total rotation type.

_{More specifically, as shown in FIG. 10, the face angle FA 1} at the first position, which is a predetermined distance away from the ball 60 at the time of addressing, and the ball 60, which is closer to the ball 60 than the first position, are still the ball. _{The face angle FA 2} at the second position, which is separated from 60 by a predetermined distance, is calculated. Then, the index C ₁₃ is calculated as the _{amount of change FA 1 − FA 2} of the face angle, which is the difference between them. Both the first position and the second position are positions through which the test club 4 passes immediately before the impact.

In the present embodiment, the index C ₁₃ is calculated by image processing the measurement data, which is the image data captured by the camera system 5. As shown in FIG. 10, in the present embodiment, a band-shaped marker M1 is attached to the crown portion of the head 41 along the face surface 41a so that the face angle can be easily grasped. The marker M1 is made of a material that efficiently reflects light from the strobes 53 and 54. Therefore, on the images taken by the cameras 51 and 52, the region of the marker M1, in other words, the strip-shaped region along the face surface 41a is clearly reflected in the plan view of the head 41. The classification unit 24B displays an image of the marker M1 on two images (images at the first position and the second position) at the timing of light emission of the strobes 53 and 54 immediately before the impact stored in the storage unit 23. Extract. Then, based on the images of these markers M1, the face angles FA ₁ and FA ₂ are calculated, and the index C ₁₃ = FA _{1 − FA 2} is calculated.

In the following step S3, the classification unit 24B classifies the rotation type of the golfer G according to the size of _{the index C 13.} More specifically, the classification unit 24B _{compares the index C 13} with a predetermined threshold value, and _{if the index C 13} is larger than the threshold value, classifies the rotation type of the golfer G into the impact rotation type, and the index C _{If 13} is below the threshold, it is classified as a total rotation type.

In the following step S4, the screen creation unit 24C creates a result screen W2 (see FIG. 11) and displays it on the display unit 21. As shown in D2 and D3, the rotation type of the golfer G and its description are displayed on the result screen W2 as in the first embodiment. Further, on the result screen W2, a one-dimensional graph as shown in D4 is displayed instead of the two-dimensional graph as shown in D1. More specifically, displays the graph area D41 having an axis representing the index C _13, In the graph area D41, D42 points plotted the value of the index C ₁₃ calculated in the step S2 is displayed. Further, as an explanation of the axis of the graph area D41, the meaning of _{the index C 13 is displayed so that the user can easily understand it.}

Therefore, even in the second embodiment, the user who sees the result screen W2 can appropriately grasp the characteristics of the golfer G. In addition, the user can know not only the rotation type of the golfer G but also the characteristics of the golfer G which is the reason for being classified into the rotation type.

Further, also in the second embodiment, the information on the rotation type of the golfer G displayed on the result screen W2 is used for fitting a golf club suitable for the golfer G, and the optimum balance is determined by the user.

We have confirmed that the optimal balance _{also depends on index C 13.} Specifically, the present inventors conducted an experiment in which 27 subjects were made to try out two golf clubs, a normal club and a light balance club described above. Then, each of the 27 subjects _{calculated the index C 13} when the normal club was hit by the same measuring device and measuring method as described above. In addition, for each of the 27 subjects, of the above two golf clubs, the club with the better shot result was identified. The quality of the shot result was determined in the same manner as in the first embodiment. FIG. 12 is a table summarizing the results. From the experimental results shown in the table, the golfer index C ₁₃ is small, normally has club better suited to golfers same index C ₁₃ is large, a tendency that light balance clubs are more suitable is confirmed It was. In FIG. 12, _{the threshold value for determining the magnitude of the index C 13} is set to 6 deg, and the result that deviates from the above tendency is colored with a background. According to the results of this experiment, the above tendency appeared in 24 out of 27 persons, that is, with a probability of 88% or more. Therefore, it was found that the optimum balance can be determined if the _{index C 13} indicating the amount of change in the degree of opening of the face surface is known.

As a result of the above, the user can confirm the rotation type of the golfer G on the result screen W2 and determine the optimum balance accordingly. Also in the present embodiment, the user can use a golf club having an optimum balance, a grip to be used for a specific golf club to achieve the optimum balance, or a grip of a specific golf club to achieve the optimum balance. The weight to be attached to the head or the like or the weight thereof may be specified from the catalog or the like. When the user is a golf club salesperson, an instructor, or the like, such a golf club, grip, weight, or weight thereof can be recommended to the golfer G.

<3. Modification example>
Although some embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention. For example, the following changes can be made. In addition, the gist of the following modified examples can be combined as appropriate.

<3-1>
In the above embodiment, the camera system 5 or the inertial sensor unit 1 is used as the measuring device for measuring the swing motion. However, the configuration of the measuring device is not limited to this, and can be changed as appropriate. For example, a three-dimensional motion capture system, a distance image sensor, or the like may be used, or a plurality of types of measuring devices may be selected from the measuring devices exemplified here or other measuring devices, and these may be used in combination.

<3-2>
In the above embodiment, the rotation type of the golfer G is displayed on the display unit 21, and the user determines the optimum balance based on the display. However, the classification unit 24B determines the optimum balance according to the rotation type determined in step S3, and the screen creation unit 24C displays the information on the optimum balance in place of or in addition to the information on the rotation type of the golfer G. It may be displayed on the unit 21.

In addition, the classification unit 24B is not only the optimum balance, but also the golf club having the optimum balance, the grip to be used for the specific golf club to achieve the optimum balance, or the specific golf club to achieve the optimum balance. The weight to be attached to the grip, the head, or the like or the weight thereof may be specified. Then, the screen creation unit 24C can display the information specified in this way on the display unit 21. As a method for realizing this, for example, a club database (DB), a head database (DB), a shaft database (DB), and a grip database (DB) are stored in the storage unit 23. The club DB referred to here contains information indicating various specifications of a large number of golf clubs (total weight, head weight, head volume, shaft weight, shaft length, various shaft rigidity, loft angle, balance, etc.). Is stored in association with information that identifies the type of golf club. Similarly, information indicating various specifications (weight, volume, loft angle, etc.) of a large number of heads is stored in the head DB in association with information for specifying the type of the head, and the shaft DB stores a large number of shafts. Information indicating various specifications (weight, length, various rigidity, etc.) is stored in association with information for specifying the type of shaft, and the grip DB indicates various specifications (weight, hardness, etc.) of a large number of grips. Information is stored in association with information that identifies the type of grip. Then, the classification unit 24B searches the club DB, extracts a golf club that matches the condition of the optimum balance, and identifies this as a golf club suitable for the golfer G (hereinafter, may be referred to as an optimum club). .. Alternatively, the classification unit 24B combines appropriate heads, shafts, and grips extracted from the head DB, shaft DB, and grip DB to create a golf club that meets the optimum balance condition, and identifies this as the optimum club. You may. At this time, the user may receive input of information indicating the user's wishes regarding the golf club via the input unit 22 and create an optimum club that meets the wishes. For example, the user can specify the type of head he / she likes. At this time, the classification unit 24B extracts information indicating various specifications of the specified type of head from the head DB, selects and combines an appropriate shaft and grip from the shaft DB and the grip DB for the head. Therefore, a golf club having the head and having an optimum balance can be created and specified as the optimum club. Further, the classification unit 24B can specify the grip included in the optimum club specified as described above, or the weight to be attached to the grip, head or the like included in the grip, or the weight thereof.

<3-3>
The above-mentioned indicators used as a reference for classifying the rotation type of the golfer G are examples and can be changed as appropriate. For example, instead of the indicator C _11, 'it can either be used in place of the indicator C _12, the following indicators C _12' following C ₁₁ can also be used. Also, 'to a start point and an end point of the integration interval can alternatively be set to a timing other than the top and impact, C ₁₁ and C _12' C ₁₂ and C ₁₁ difference other than the top and impact the timing of the angular velocity to be taken of It can also be set to the timing.

Although various indexes that serve as a reference for classifying the rotation type of the golfer G have been described above, the rotation type of the golfer G can be classified according to one or a plurality of combinations thereof. For example, the _{golfer G rotation type may be classified only by C 11} (for example, whether or not it is an impact rotation type), or the golfer G rotation type may be classified by combining _{C 11} and C _{13 (for example, impact).} It may be judged whether it is a rotation type or not).

<3-4>
The classification of the rotation type of the golfer G is not limited to the above-mentioned examples of the impact rotation type and the total rotation type, and can be appropriately set. Further, the rotation type of golfer G may be classified from three or more types. For example, the area on or around the boundary line L1 described above is defined as an area corresponding to the early rotation type in which face rotation is performed at the initial stage of the downswing, and the golfer G's rotation type is selected from the three rotation types including this. You can also select.

100,200 Analysis system 1 Inertia sensor unit (measuring equipment)
2,102 Golf swing analyzer 24A Acquisition unit 24B Classification unit 24C Screen creation unit 3 Analysis program 4 Test club (golf club)
40 Shaft 41 Head 42 Grip 5 Camera system (measuring equipment)
G golfer

Claims (9)

An acquisition unit that acquires measurement data obtained by measuring the swing motion of a golf club by a golfer with a measuring device,
Based on the measurement data, a classification unit that classifies the rotation type, which is a type related to the timing of face rotation of the golfer, and a classification unit.
A screen creation unit for creating a screen for displaying the rotation type of the golfer is provided.
Golf swing analyzer. Based on the measurement data, the classification unit calculates a first index indicating the magnitude of the movement of the golfer pulling the golf club immediately before impact, and according to the size of the first index, the golfer's Classify rotation types,
The golf swing analyzer according to claim 1. The screen creation unit creates a screen for displaying a graph in which the values of the first index based on the measurement data are plotted in an area having an axis representing the first index.
The golf swing analyzer according to claim 2. Based on the measurement data, the classification unit further calculates a second index indicating the magnitude of the movement of the golfer pushing the golf club during the downswing, and according to the first index and the second index. , Classify the rotation type of the golfer,
The golf swing analyzer according to claim 2. The screen creation unit displays a graph in which the values of the first index and the second index based on the measurement data are plotted in a region having an axis representing the first index and an axis representing the second index. Create a screen,
The golf swing analyzer according to claim 4. The classification unit classifies the golfer's rotation type from a plurality of types including a type that performs face rotation immediately before impact.
The swing analyzer according to any one of claims 1 to 5. The plurality of types further include a type that performs face rotation throughout the downswing.
The golf swing analyzer according to claim 6. Acquiring measurement data obtained by measuring the swing motion of a golf club by a golfer with a measuring device,
Based on the measurement data, classifying the rotation type, which is a type related to the timing of the face rotation of the golfer, and
Let the computer perform the creation of a screen that displays the golfer's rotation type.
Golf swing analysis program. Displaying the screen using the golf swing analyzer according to any one of claims 1 to 7.
A fitting method comprising determining a balance of a golf club suitable for the golfer according to the rotation type of the golfer displayed on the screen, and recommending the balance to the golfer.

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