JP2021058304A - Fitting device of golf club - Google Patents

Abstract

To provide a fitting device that enables a golf club with a balance suitable for a golfer to be selected.SOLUTION: A fitting device acquires measurement data obtained by measuring a swing action of a test club by a golfer with a measuring device; calculates, on the basis of the measurement data, a cock index showing movement of a cock in a latter half of downswing in the swing action, and a push index showing movement of rotation of the test club in a direction projecting from a swing plane in the swing action; and selects, on the basis of the cock index and the push index, a value larger than a predetermined value out of a plurality of candidates as at least one of weight and a moment of inertia of a golf club suitable for the golfer when the movement of the cock is determined to be large, and the movement of the rotation is determined to be large.SELECTED DRAWING: Figure 3

Description

The present invention relates to fitting devices, methods and programs for selecting a golf club suitable for a golfer.

Conventionally, various fitting methods have been proposed in which a golfer is made to test-hit a test club, the operation is measured by a measuring device, and a golf club suitable for the golfer is selected based on the measurement data at this time. Patent Document 1 discloses a fitting method in which a golf club weight or moment of inertia value suitable for a golfer is specified based on measurement data, and a golf club that meets the specified value condition is recommended to the golfer. ing. According to the fitting method as described above, it is possible to provide a golf club with specifications suitable for each individual, and improvement of shots such as an increase in flight distance and a reduction in left-right blur is expected.

JP-A-2017-170105

More specifically, in Patent Document 1, indexes called arm output power and club input power are calculated based on the measurement data, and the weight or moment of inertia suitable for the golfer is calculated according to the magnitude of these values. The value is specified. There is a certain relationship between the arm output power and the club input power and the value of the weight or moment of inertia suitable for the golfer. Therefore, in Patent Document 1, a weight or moment of inertia suitable for a golfer is specified with reference to such a predetermined relationship. But there are always exceptions. It is important to handle such exceptions well in order to accurately fit a golf club suitable for an individual.

It is an object of the present invention to provide a fitting device, method and program that enables a golfer to accurately select a golf club having at least one of a weight and a moment of inertia suitable for the golfer.

The fitting device according to the first aspect is an acquisition unit that acquires measurement data obtained by measuring the swing motion of a test club by a golfer with a measuring device, and a cock movement in the latter half of the downswing during the swing motion based on the measurement data. A cock index representing the above, a calculation unit that calculates a push index representing the rotation movement of the test club in the direction of jumping out of the swing plane during the swing operation, and the movement of the cock based on the cock index and the push index. Is large, and when it is determined that the rotation movement is large, a value larger than a predetermined value is selected from a plurality of candidates as at least one of the weight and the moment of inertia of the golf club suitable for the golfer. It has a part.

The fitting device according to the second aspect is the fitting device according to the first aspect, and the calculation unit represents the characteristics of the swing operation, which is different from the cock index and the push index, based on the measurement data. Calculate one or more swing indices. The selection unit is suitable for the golfer according to the swing index when it is determined that the movement of the cock is small or the movement of the rotation is small based on the cock index and the push index. Select at least one of the weight and moment of inertia of the golf club.

The fitting program according to the third aspect causes the computer to execute the following.
-Acquiring measurement data obtained by measuring the swing motion of a test club by a golfer with a measuring device-Calculating a cock index representing the cock movement in the latter half of the downswing during the swing motion based on the measurement data-The above Based on the measurement data, calculate a push index representing the rotation movement of the test club in the direction of jumping out of the swing plane during the swing operation.-Based on the cock index and the push index, the movement of the cock is large. In addition, when it is determined that the rotation movement is large, a value larger than a predetermined value is selected from a plurality of candidates as at least one of the weight and the moment of inertia of the golf club suitable for the golfer.

The fitting method according to the fourth aspect includes the following.
-Acquisition of measurement data that measures the swing motion of the test club by the golfer using a measuring device
-Using a computer, based on the measurement data, calculate a cock index indicating the movement of the cock in the latter half of the downswing during the swing operation, and
-Using the computer, based on the measurement data, a push index representing the rotation movement of the test club in the direction of jumping out of the swing plane during the swing operation is calculated.
-When it is determined that the movement of the cock is large and the movement of the rotation is large based on the cock index and the push index, as at least one of the weight and the moment of inertia of the golf club suitable for the golfer. , Select a value larger than the specified value from multiple candidates

According to the findings obtained by the present inventors, when the cock index during the swing operation by the golfer is large and the push index is large, a golf club having a larger weight and moment of inertia is suitable for the golfer. There is a tendency. In this respect, from the above viewpoint, when both the cock index and the push index are large, a value larger than a predetermined value is selected from a plurality of candidates as at least one of the weight and the moment of inertia suitable for the golfer. .. Therefore, it is possible to accurately select a golf club having at least one of a weight and a moment of inertia suitable for a golfer.

The figure which shows the fitting system which includes the fitting apparatus which concerns on 1st Embodiment. The functional block diagram of the fitting system which concerns on 1st Embodiment. The flowchart which shows the flow of the fitting process which concerns on 1st Embodiment. A conceptual diagram illustrating a push index. The figure explaining the model for calculating various indicators. A graph showing the relationship between the arm output power and the club input power and the optimum shaft weight. A graph summarizing the relationship between the arm output power and club input power and the optimum weight for a golfer whose cock index and push index are smaller when a large number of golfers actually try out a golf club. A graph summarizing the relationship between the arm output power and club input power and the optimum weight for a golfer whose cock index and push index are both large when a large number of golfers actually try out a golf club. The figure explaining the index which shows the change amount of the opening degree of the face surface of the head which concerns on 1st Embodiment. The figure explaining another index showing the amount of change of the opening degree of the face surface of the head which concerns on 1st Embodiment. A graph summarizing the relationship between two indexes showing the amount of change in the degree of opening of the face surface of the head according to the first embodiment and the optimum balance when a large number of golfers actually hit a golf club. The flowchart which shows the flow of the fitting process which concerns on 2nd Embodiment. A graph summarizing the relationship between the index and arm output power representing the amount of change in the degree of opening of the face surface of the head according to the second embodiment when a large number of golfers actually hit a golf club, and the optimum balance. The figure which shows the fitting system which includes the fitting apparatus which concerns on 3rd Embodiment. The functional block diagram of the fitting system which concerns on 3rd Embodiment. The figure explaining the index which shows the change amount of the opening degree of the face surface of the head which concerns on 3rd Embodiment. A table summarizing the relationship between an index showing the amount of change in the degree of opening of the face surface of the head according to the third embodiment and the optimum balance when a large number of golfers actually hit a golf club.

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

<1. First Embodiment>
<1-1. Outline configuration of fitting system>
1 and 2 show the overall configuration of the fitting system 100 including the fitting device 2 according to the present embodiment. The fitting device 2 assists the golfer G in selecting a golf club suitable for the golfer G based on the measurement data obtained by measuring the swing of the test golf club (hereinafter referred to as the test club) 4. It is a device of. 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 fitting device 2 constitutes a fitting system 100 together with the inertial sensor unit 1.

Hereinafter, the configuration of the inertial sensor unit 1 and the fitting device 2 will be described, and then the flow of the fitting process 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 fitting device 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 fitting device 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 in a predetermined sampling cycle Δt and transmitted to the fitting device 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. Fitting device configuration>
The fitting device 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 fitting device 2 is manufactured by installing the fitting program 3 according to the present embodiment on a general-purpose computer. The fitting program 3 is acquired by the fitting device 2 from a recording medium 20 such as a computer-readable CD-ROM, or via a communication network such as a local area network (LAN) or the Internet connected to the communication unit 25. To. The fitting program 3 is software for analyzing the swing motion based on the measurement data transmitted from the inertial sensor unit 1 and outputting information that assists in selecting a golf club suitable for the golfer G. The fitting program 3 causes the fitting device 2 to execute an operation described later.

The fitting device 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 golfers G themselves, their instructors, golf club salespeople, and other persons who require fitting results. 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 fitting device 2. The communication unit 25 is a communication interface that enables communication between the fitting device 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. In addition to storing the fitting program 3 in the storage unit 23, measurement data transmitted from the inertial sensor unit 1 is stored. Further, the club database (DB) 27, the head database (DB) 28, the shaft database (DB) 29, and the grip database (DB) 30 are stored in the storage unit 23. In the club DB 27, information indicating various specifications (overall weight, head weight, head volume, shaft weight, shaft length, loft angle, balance, etc.) of a large number of golf clubs identifies the type of golf club. It is stored in association with the information to be used. Similarly, information indicating various specifications (weight, volume, loft angle, etc.) of a large number of heads is stored in the head DB 28 in association with information for specifying the type of the head, and a large number of information is stored in the shaft DB 29. Information indicating various specifications (weight, length, etc.) of the shaft is stored in association with information for specifying the type of the shaft, and various specifications (weight, hardness, etc.) of a large number of grips are stored in the grip DB30. The information shown is stored in association with the information that identifies the type of grip.

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 calculation unit 24B, the selection unit 24C, and the display control unit 24D by reading and executing the fitting program 3 in the storage unit 23. Details of the operation of each part 24A to 24D will be described later.

<1-3. Fitting process>
Subsequently, the fitting process executed by the fitting system 100 will be described. First, the outline of the process will be described. Measurement data obtained by measuring the state of the golfer G when he / she hits the test club 4 is acquired, and based on the measurement data, the specifications of the golf club suitable for the golfer G (hereinafter referred to as “specification”). The optimum specifications) are determined. Then, a golf club that meets the conditions of the optimum specifications is selected as a golf club suitable for the golfer G (hereinafter, may be referred to as an optimum club), and is recommended to the golfer G. This makes it possible to provide the golfer G with an optimum club having optimum specifications that matches the characteristics of the swing operation of the golfer G. As a result, the shot of the golfer G can be improved by increasing the flight distance of the shot and reducing the left-right blur.

In the present embodiment, a balance suitable for the golfer G (hereinafter, may be referred to as an optimum balance) is determined as one item of the optimum specifications. 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, a golf club that matches the characteristics of the swing motion of the golfer G is selected in consideration of the above balance.

Further, in the present embodiment, as another item of the optimum specifications, the weight of the golf club suitable for the golfer G (hereinafter, may be referred to as the optimum weight) is determined. The optimum weight referred to in the present embodiment is, more accurately, the weight of the shaft included in the golf club suitable for the golfer G (hereinafter, may be referred to as the optimum shaft weight).

More specifically, the fitting process according to the present 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 fitting device 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 fitting device 2 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 calculation unit 24B calculates the cock index and the push index based on the measurement data stored in the storage unit 23. The cock index is an index showing the movement of the cock in the latter half of the downswing during the swing operation. The cock index can be calculated, for example, as a value comparing the difference _{in ω y} near the top with _{the average value of ω y from the time when ω y} becomes maximum to the impact. On the other hand, the push index is an index representing the rotation movement (see FIG. 4) of the test club 4 in the direction (push direction) of jumping out of the swing plane P during the swing operation. The swing plane P is a plane including the shaft 40 at the time of impact, and can be defined as a plane parallel to the ground plane and parallel to the direction from the ball hitting point to the target point.

The selection unit 24C determines whether or not the cock index is equal to or higher than a predetermined threshold value and the push index is equal to or higher than a predetermined threshold value, and if the same condition is satisfied, the process proceeds to step S42. On the other hand, if the same condition is not satisfied, in other words, if the cock index is smaller than the predetermined threshold value or the push index is smaller than the predetermined threshold value, the process proceeds to step S3.

In step S3, the calculation unit 24B is an index representing the characteristics of the swing operation of the golfer G based on the measurement data stored in the storage unit 23, and is a predetermined index for selecting the optimum weight (optimum shaft weight). Index A ₁ is calculated. In the present embodiment, _{as such an index A 1} , the power output by the golfer G's arm during the swing operation (hereinafter referred to as the arm output power) P ₁ and the power input to the test club 4 during the swing operation (hereinafter referred to as the arm output power) P 1 , Club input power) P ₂ is calculated. The arm output power P ₁ and the club input power P ₂ are known indexes that are described in detail in, for example, Patent Document 1, and can be defined as shown in the following equation.

Here, T _g1 means the torque around the center of gravity of the golfer's arm, T _g2 means the torque around the center of gravity of the golf club, and ω ₁ means the angular velocity of the golfer G's arm. R ₂ is the binding force generated in the grip, and v _g is the velocity vector of the grip. The arm output power P ₁ and the club input power P ₂ can be analyzed using a pendulum model in which the arm and the golf club are the links and the shoulder and the grip are the nodes as shown in FIG. Further, in the present embodiment, the index A ₁ is analyzed after projecting the movements of the arms of the test club 4 and the golfer G during the swing motion on the swing plane P. Although not limited to this, in the present embodiment, _{the arm output power as the index A 1} is calculated as the average arm output power P ₁ (hereinafter, may be referred to as _{P 1} _ _{AVE) during the swing motion. More specifically, it is calculated by integrating the arm output power P 1} in the interval from the top time to the time when the arm output power P ₁ takes the maximum value, and dividing this integrated value by the integration interval. Similarly, _{the club input power as the index A 1} is also calculated as the average club input power P ₂ during the swing operation (hereinafter, _{may be referred to as P 2} _ _AVE ), and more specifically, the top time. Club input power P ₂ is integral to the club input power P ₂ in a section to the time that takes the maximum value, is calculated by dividing the integrated value by the integration interval from.

In the following step S41, the selection unit 24C selects the optimum weight (optimum shaft weight) according to _{the index A 1} (arm output power P ₁ _ _AVE and club input power P ₂ _ _{AVE) calculated in step S3.} .. As disclosed in Patent Document 1 and the like, it is known _{that the larger the arm output power P 1} _ _AVE , the larger the optimum weight, and similarly, the larger the club input power P ₂ _ _AVE , the larger the optimum weight. Has been done. In particular, by combining such a plurality of indexes P ₁ _ _AVE and P ₂ _ _AVE , the optimum weight can be determined with a higher probability. FIG. 6 is a graph showing the relationship between the arm output power P ₁ _ _AVE and the club input power P ₂ _ _{AVE for a specific head and the optimum shaft weight.} As shown in FIG. 6, _{the plane centered on the arm output power P 1} _ _AVE and the club input power P ₂ _ _AVE is divided into a plurality of regions to which a larger optimum weight is associated toward the upper right.

Based on the above findings, in step S41, the selection unit 24C sets _{the values of the arm output power P 1} _ _AVE and the club input power P ₂ _ _AVE calculated in step S3 to both indexes P ₁ _ _AVE and P ₂ _. _{Plot in a plane with AVE} as the axis (see graph area in FIG. 6), and any area where the plotted points are separated by a predetermined boundary line (see L1 in FIG. 6) in the same plane. Determine if it belongs to. Then, the optimum weight (optimum shaft weight) associated with the region to which the plotted points belong is selected. From the viewpoint of determining the optimum shaft weight more accurately, the information for specifying the above boundary line and the information for the optimum shaft weight associated with the region divided by the boundary line (hereinafter referred to as shaft weight determination information). Is preferably determined for each type of head. Therefore, in the present embodiment, shaft weight determination information is stored in advance in the storage unit 23 for each of a large number of head types. Then, the selection unit 24C receives input of information for specifying the head type from the user via the input unit 22, and determines the optimum shaft weight based on the shaft weight determination information corresponding to the head type.

On the other hand, in step S42, the selection unit 24C selects a value larger than a predetermined value from a plurality of candidate values as the optimum weight (optimum shaft weight). The predetermined value referred to here can be, for example, any one of a plurality of candidate values that can be selected as the value of the optimum weight in step S41. In step S42 of the present embodiment, the maximum value among the candidate values that can be selected as the optimum weight value in step S41 is selected as the optimum weight. Therefore, in step S42 of the present embodiment, as the optimum weight, a value less than or equal to a predetermined value that can be selected in step S41 is not selected.

As described above, the reason why step S41 or step S42 is selectively executed as the step of selecting the optimum weight is as follows. That is, the rotation movement represented by the push index does not appear on the swing plane P, and the overall image of the cock movement represented by the cock index is not necessarily projected on the swing plane P. However, the cock and push indicators can affect the optimum weight. _{On the other hand, since the index A 1 which} is a reference for selecting the optimum weight in step S41 represents the characteristics of the swing motion projected on the swing plane P, it cannot represent the motion represented by the push index and the cock index. Therefore, in step S2, it is determined whether or not to execute step S42 as an exception to step S41, depending on the cock index and the push index.

The present inventors have confirmed by experiments the significance of performing the exception handling in step S42. We had 27 subjects try out two golf clubs of different weights. Of the two golf clubs, one was a 275 g golf club and the other was a 294 g golf club. The head is common between these two golf clubs, and a 294 g golf club is prepared by changing the shaft and grip of the 275 g golf club to a heavier shaft and grip of 11 g and 8 g, respectively. did.

In addition, the present inventors have a cock index and a push index when each of the 27 subjects tried a lighter 275 g golf club, and an arm output power P ₁ _ _AVE and a club input power P ₂ _ at this time. _AVE was calculated. 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 evaluated comprehensively by observing the flight distance and directionality (left-right blur). 7A and 7B are graphs summarizing the results. FIG. 7A is a distribution diagram of the values of _{the arm output power P 1} _ _AVE and the club input power P ₂ _ _AVE of 19 persons whose cock index was smaller than the predetermined threshold value or whose push index was smaller than the predetermined threshold value. is there. On the other hand, FIG. 7B shows the distribution of the values of _{the arm output power P 1} _ _AVE and the club input power P ₂ _ _AVE of eight persons whose cock index was equal to or higher than a predetermined threshold and whose push index was equal to or higher than a predetermined threshold. It is a figure.

As shown in FIG. 7B, when both the cock index and the push index are large, it was found that a heavier golf club is suitable regardless _{of the arm output power P 1} _ _AVE and the club input power P ₂ _ _AVE. .. On the other hand, as shown in FIG. 7A, when at least one of the cock index and the push index is small, a heavier golf club has a heavier golf club depending on the magnitude _{of the arm output power P 1} _ _AVE and the club input power P ₂ _ _AVE. It turns out that there are people who are suitable and those who are suitable for lighter golf clubs. More specifically, in the plane centered on the arm output power P ₁ _ _AVE and the club input power P ₂ _ _AVE , the area lower left than the boundary line L1 is associated with the lighter golf club and is associated with the boundary line L1. It was confirmed that the area on the upper right of the area tends to be associated with a heavier golf club.

In FIGS. 7A and 7B, the results that deviate from the above trends are circled. From the results of the above experiments, when the optimum weight was selected only in step S41, the optimum weight could be correctly selected in 19 out of 27 persons, that is, with a probability of about 70%. On the other hand, when the same conditions as in step S2 are satisfied, as an exception to step S41, when step S42 is executed, the optimum weight is correctly selected in 23 out of 27 persons, that is, with a probability of 85% or more. It turns out that it can be done.

When step S41 or S42 is completed, step S5 is executed. _{In step S5, the calculation unit 24B sets a predetermined index C 1} for selecting the optimum balance, which is an index representing the characteristics of the swing operation of the golfer G based on the measurement data stored in the storage unit 23. calculate. The index C ₁ is an index representing the amount of change in the degree of opening of the face surface 41a of the head 41 during the swing operation, and includes two indexes C ₁₁ and C ₁₂ 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. 8A and 8B 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.

The index C ₁ as described above is calculated in step S5 based on the finding that the amount of change in the degree of opening of the face surface 41a during the swing operation affects the optimum balance. The present inventors obtained this finding through the following experiments.

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. 9 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, the index C ₁₁ showed a stronger tendency than the index C _12.

As a result of the above, as shown in FIG. 9, _{the plane centered on the indexes 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. 9, 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.}

Based on the above findings, in the following step S6, the selection unit 24C selects the optimum balance according to the magnitudes _{of the indicators C 11} and C _12. More specifically, the selection unit 24C sets the value of the index C ₁₁ and C ₁₂ calculated in the step S5, both indices C ₁₁ and C ₁₂ are plotted in a plane whose axes, the point plotted, It is determined which region is divided by a predetermined boundary line (see L2 in FIG. 9) in the same plane. Then, the balance associated with the area to which the plotted points belong is selected as the optimum balance. In the example of FIG. 9, the boundary line is one, but one or a plurality of boundary lines can be set here, and the optimum balance is selected from two or three or more balances. Be selected.

In the following step S7, the selection unit 24C selects a golf club having the optimum specifications selected in steps S41 or S42 and step S6 as the optimum club. That is, a golf club having the optimum weight selected in step S41 or S42 and the optimum balance selected in step S6 is selected as the optimum club. More specifically, the selection unit 24C searches the club DB 27, extracts a golf club that matches the conditions of the optimum weight and the optimum balance, and specifies this as the optimum club. Alternatively, the selection unit 24C combines the appropriate heads, shafts and grips extracted from the head DB28, the shaft DB29 and the grip DB30 to create a golf club that meets the conditions of the optimum weight and the optimum balance, and optimizes the golf club. It may be specified as a club. In the present embodiment, as described above, since the type of head is specified by the user, a golf club having the type of head is specified as the optimum club.

In the following step S8, the display control unit 24D displays the information for identifying the optimum club selected in step S7 together with the information on the optimum weight and the information on the optimum balance selected in steps S41 or S42 and S6, respectively. 21 Displayed on top. A golf club salesperson, an instructor, or the like confirms such information on the display unit 21 together with the golfer G, and recommends the golf club to the golf club having the optimum weight and the optimum balance. With the above, the fitting process is completed.

<2. Second Embodiment>
Next, the fitting process according to the second embodiment will be described with reference to FIG. The main difference between the first embodiment and the second embodiment is that the index for selecting the optimum balance is 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.

More specifically, in the second embodiment, as an index for selecting the optimum balance, _{in addition to the above-mentioned index C 1} , a preliminary index representing another characteristic of the swing motion of the golfer G is calculated. Preliminary indicators are indicators that are preliminarily considered to select the optimal balance. In the second embodiment, the optimum balance is determined according to the combination of _{the index C 1 and the preliminary index (step S61).} The preliminary index of the present embodiment is the arm output power P ₁ _ _AVE, which is _{one of the indexes A 1 for selecting the optimum weight.}

_{In FIG. 11, the arm output power P 1} _ _AVE is calculated from the measurement data acquired in the same experiment as in FIG. 9, and the arm output power P ₁ _ _AVE and the index C ₁₁ are in a plane centered on both of them. The result plotted in is shown. From the figure, even when the index C ₁₁ and the arm output power P ₁ _ _AVE are used, the golfer who fits the normal club and the golfer who fits the light balance club are stratified with the same high probability as in the case of Fig. 9. It was confirmed that it could be done. Therefore, the index C ₁ representing the amount of change in opening degree of the face surface 41a of the head 41 during the swing operation, by combining the arm output power P _1, it was found that the optimum balance is accurately determinable.

Based on the above findings, the fitting process according to the second embodiment proceeds as shown in FIG. Steps S1 to S42 are the same as those in the first embodiment. In the second embodiment, after step SS41 or S42, step S51 is executed instead of step S5. Step S51 is substantially the same as step S5, but the calculation of the _{index C 12 is omitted, and only the index C 11} is calculated.

Then, in the second embodiment, step S61 is executed instead of step S6. In step S61, the selection unit 24C acquires a preliminary index for selecting the optimum balance. Since the preliminary index of this embodiment is the arm output power P ₁ _ _AVE , it has already been calculated as _one of the indexes A 1 for selecting the optimum weight when step S3 is executed. .. In this case, the selection unit 24C uses the calculation result of step S3 to acquire the value _{of the arm output power P 1} _ _{AVE as a preliminary index.} On the other hand, when step S3 is not executed, the same calculation as in step S3 is executed here, and _{the value of the arm output power P 1} _ _AVE as a preliminary index is acquired.

Subsequently, the selection unit 24C selects the optimum balance according to the magnitude of the _{index C 1} indicating the amount of change in the opening degree of the face surface 41a and the arm output power P ₁ _ _{AVE which is a preliminary index.} More specifically, the selection unit 24C sets the value of the above index C ₁₁ as calculated in and P ₁ _ _AVE, both indices C ₁₁ and P ₁ _ _AVE plotted in a plane whose axes are plotted It is determined which region the point belongs to, which is divided by a predetermined boundary line (see L2 in FIG. 11) in the same plane. Then, the balance associated with the area to which the plotted points belong is selected as the optimum balance. In the example of FIG. 11, the boundary line is one, but one or a plurality of boundary lines can be set here, and the optimum balance is selected from two or three or more balances. Be selected. Steps S7 and S8 after the optimum balance is selected are the same as in the first embodiment.

<3. Third Embodiment>
12 and 13 show the overall configuration of the fitting system 200 having the fitting device 102 according to the third embodiment. The main difference between the first and second embodiments and the third embodiment is that the indexes for selecting the optimum balance are 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 and second embodiments will be omitted, and the third embodiment will be described focusing on the differences between these embodiments.

In the third embodiment, the measuring device for measuring the swing motion includes the camera system 5 in addition to the inertial sensor unit 1. 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. 12 and 13, 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 golf 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. Has been done.

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 fitting device 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. 12). 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 fitting device 102.

Next, an index for selecting the optimum balance according to the third embodiment will be described. As described above, according to the findings obtained by the present inventors, the amount of change in the degree of opening of the face surface 41a during the swing operation affects the optimum balance. Therefore, in the third embodiment, the index C ₁₃ representing the amount of change in the face angle is calculated as an index for selecting the optimum balance. The index C _{13 is also an index C 1} indicating the amount of change in the degree of opening of the face surface 41a during the swing operation, similarly to the _{indexes C 11} and C _{12 according} to the first and second embodiments. _{In the present embodiment, as shown in FIG. 14, the face angle FA 1} at the first position separated from the ball 60 at the time of addressing by a predetermined distance and the ball 60 are closer than the first position, but the ball 60 is still present. _{The face angle FA 2} at the second position separated from the above by a predetermined distance is calculated, and the index C ₁₃ is calculated as the difference FA _{1 − FA 2} . 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. 14, 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 calculation 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.

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. 15 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. 15, _{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.

The fitting process according to the third embodiment proceeds as shown in FIG. 3, similarly to the first embodiment. _{However, based on the above findings, in step S5, the calculation unit 24B sets the index C 11} as the index C ₁ indicating the amount of change in the opening degree of the face surface 41a based on the measurement data stored in the storage unit 23. And C ₁₂ but index C ₁₃ is calculated.

In the following step S6, the selection unit 24C selects the optimum balance according to the magnitude of _{the index C 13.} More specifically, the selection unit 24C selects a lighter optimum balance as the _{index C 13 is larger.} At this time, the selection unit 24C _{compares the index C 13} with a predetermined threshold value of 1 or a plurality of threshold values determined stepwise, and the index C ₁₃ is in any range with the threshold value as a boundary. Judge whether it belongs to, and select a lighter optimum balance as it belongs to a larger range. Steps S7 and S8 after the optimum balance is selected are the same as in the first embodiment.

<4. 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.

<4-1>
In the above embodiment, the inertial sensor unit 1 and / or the camera system 5 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 appropriately selected from the above-exemplified or other measuring devices, and these may be used in combination. ..

<4-2>
In the above embodiment, in step S8, all of the information for identifying the optimum club, the information for the optimum balance, and the information for the optimum weight are displayed on the display unit 21, but only a part of them may be displayed. For example, when only information on the optimum balance and the optimum weight is displayed, a golf club salesperson or an instructor who sees this information searches a catalog or the like for a golf club that matches the optimum balance and the optimum weight, and golfer G. May be recommended for. If the information for identifying the optimum club is not displayed in step S8, step S7 can be omitted. Further, in addition to step S7, at least one of steps S41, S42, S6 and S61 can be omitted. In this case, _{by appropriately displaying the indexes A 1} , C ₁ , the preliminary index, the cock index, and the push index in step S8, the index is omitted while referring to the information prepared in advance indicating the relationship between these indexes and the optimum specifications. A person can also perform the steps taken.

Further, the selection unit 24C derives a customization method for customizing a specific golf club that matches the optimum weight condition so as to achieve the optimum balance, and the display control unit 24D displays this on the display unit 21. You may. For example, the weight of the weight that should be attached to the grip, head, etc. of the golf club in order to achieve the optimum balance while displaying information that identifies the types of shafts and heads that make up the golf club that meets the optimum weight conditions. May be calculated and displayed as a customization method.

<4-3>
_{The index C 1} representing the amount of change in the degree of opening of the face surface 41a during the swing operation described above is an example, and can be appropriately changed. For example, instead of the indicator C _11, 'can either be used in place of the indicator C _12, the following indicators C _12' following indicators 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.

In the first embodiment, 'the index relating omega _z, such as, C ₁₂ and C _12' C ₁₁ and C ₁₁ is not necessary to combine the metrics for such omega _x as, one of the omega _z or omega _x The optimum balance may be selected according to only the index related to. However, in this case, it is desirable to use an index related _{to ω z, which is} more dominant with respect to the amount of change in the degree of opening of the face surface 41a, as in the second embodiment.

Although various indexes C ₁ including the index C ₁₃ have been described above, the optimum balance can be determined according to one or a plurality of combinations thereof.

<4-4>
In the above embodiment, the arm output power P _{1 is illustrated as a preliminary index used in combination with the index C 1} to select the optimum balance, but other indexes can also be used. For example, in addition to the arm output power P ₁ , the optimum balance can be determined when the index C _{1 is combined with the following preliminary indexes.}
・ Club input power P ₂
・ Energy exerted by golfer G during swing operation (hereinafter referred to as exerted energy) E ₁
-Torque exerted by golfer G during swing operation (hereinafter referred to as exerted torque) T

The exerted energy E ₁ is a known index described in detail in Patent Document 1 and the like. For example, the amount of work exerted by the golfer G's arm or the exerted energy per unit time by the golfer G's arm is averagely exerted. Can be defined as the average workload. Workload arms, for example, 'from a predetermined time period (e.g., the top of the time, the arm work rate in the subsequent top E _1' arm of work rate E ₁ as described below until the time turns from positive to negative ) Can be calculated, and the average work of the arm can be calculated as a value obtained by dividing such an integrated value by the length of the integration interval.

The exerted torque T is also a known index described in detail in Patent Document 1 and the like, and is defined as, for example, an integrated value obtained by integrating the torque around the shoulder of the golfer G in a predetermined period (for example, from the top to the impact). Alternatively, it can be defined as a value obtained by dividing this integrated value by the length of the integrated interval, that is, the average torque around the shoulder that is exerted on average per unit time.

Having described the various preliminary indicators, one or more optional indicator C ₁ described above, by combining one or more of these preliminary indicators as appropriate, can determine the optimal balance.

<4-5>
In step S3 of the above embodiment, the optimum shaft weight is calculated as the optimum weight, but instead of or in addition to this, the weight of the entire golf club suitable for the golfer G (hereinafter, may be referred to as the optimum club weight). May be calculated.

Further, in step S3, the moment of inertia of the golf club suitable for the golfer G (hereinafter, may be referred to as the optimum MI) may be calculated in place of or in addition to the optimum weight. In this case, in step S7, a golf club that meets the optimum MI conditions is selected as one of the optimum specifications. Examples of the moment of inertia referred to here include the swing moment of inertia I _S , the moment of inertia I _{G around the grip end, and the moment of inertia I 2} around the center of gravity of the golf club. Incidentally, the swing moment of inertia I _S, as disclosed in Patent Document 1 or the like, a moment of inertia about the shoulders of the golfer G during the swing operation, for example, can be defined as the following equation.
_IS = I ₂ + m ₂ (R + L) ² + I ₁ + m ₁ (R / 2) ²

Further, for each golfer G, the weight of the arm is the same even if the golf club is changed. Accordingly, the swing moment of inertia I _S omits revolution of the moment of inertia of the arm, may be appropriate as the following equation.
_IS = I ₂ + m ₂ (R + L) ²

However, m ₁ is the mass of the arm, m ₂ is the mass of the golf club, R is the length of the golfer G's arm, L is the distance from the grip end to the center of gravity of the golf club, and I ₁ is the golfer G. The moment of inertia around the center of gravity of the arm.

<4-6>
The arm output power P ₁ can be used _{not only as the optimum shaft weight but also as an index A 1} for selecting the optimum club weight and the optimum MI. Further, various preliminary indexes exemplified in the modified example 4-4 can be used _{not only as the optimum shaft weight but also as the index A 1 for selecting the optimum club weight and the optimum MI.} For details, refer to Patent Document 1 and the like.

<4-7>
In the above embodiment, steps S5 (S51) and S6 (S61) may be omitted, and in step S7, a golf club that meets only the optimum weight condition may be selected as the optimum club.

100,200 Fitting system 1 Inertia sensor unit (measuring equipment)
2,102 Fitting device 24A Acquisition unit 24B Calculation unit 24C Selection unit 24D Display control unit 3 Fitting program 4 Test club 40 Shaft 41 Head 42 Grip 5 Camera system (measuring equipment)
G golfer

Claims (4)

An acquisition unit that acquires measurement data obtained by measuring the swing motion of a test club by a golfer with a measuring device,
Based on the measurement data, a cock index representing the movement of the cock in the latter half of the downswing during the swing operation and a push index representing the rotation movement of the test club in the direction of jumping out from the swing plane during the swing operation are calculated. Calculation part and
When it is determined that the movement of the cock is large and the movement of the rotation is large based on the cock index and the push index, as at least one of the weight and the moment of inertia of the golf club suitable for the golfer. A fitting device including a selection unit that selects a value larger than a predetermined value from a plurality of candidates. Based on the measurement data, the calculation unit calculates one or a plurality of swing indexes representing the characteristics of the swing operation, which are different from the cock index and the push index.
The selection unit is suitable for the golfer according to the swing index when it is determined that the movement of the cock is small or the movement of the rotation is small based on the cock index and the push index. Select at least one of the weight and moment of inertia of the golf club,
The fitting device according to claim 1. Acquiring measurement data obtained by measuring the swing motion of a test club by a golfer with a measuring device,
Based on the measurement data, the cock index representing the movement of the cock in the latter half of the downswing during the swing operation is calculated.
Based on the measurement data, a push index representing the rotation movement of the test club in the direction of jumping out of the swing plane during the swing operation is calculated.
When it is determined that the movement of the cock is large and the movement of the rotation is large based on the cock index and the push index, as at least one of the weight and the moment of inertia of the golf club suitable for the golfer. A fitting program that causes a computer to select a value larger than a predetermined value from multiple candidates. Acquiring measurement data that measures the swing motion of a test club by a golfer using a measuring device,
Using a computer, the cock index representing the movement of the cock in the latter half of the downswing during the swing operation is calculated based on the measurement data.
Using the computer, the push index representing the rotation movement of the test club in the direction of jumping out of the swing plane during the swing operation is calculated based on the measurement data.
When it is determined that the movement of the cock is large and the movement of the rotation is large based on the cock index and the push index, as at least one of the weight and the moment of inertia of the golf club suitable for the golfer. A fitting method that includes selecting a value larger than a predetermined value from a plurality of candidates.

Images