JP7487543B2 - Golf club shaft fitting device - Google Patents

Description

The present invention relates to a fitting device and program for fitting a golf club shaft suitable for a golfer.

Conventionally, various fitting methods have been proposed in which a golfer's golf swing is measured using a measuring device, and a golf club suitable for the golfer is selected based on the measurement data. Patent Document 1 discloses a fitting method that calculates characteristic values of a golf club suitable for a golfer based on the measurement data, and recommends a golf club that matches those characteristic values to the golfer. In Patent Document 1, an index called the International Flex Code (IFC) suitable for a golfer is calculated as one of the characteristic values of a golf club suitable for a golfer. IFC is a well-known index that indicates the characteristics of a shaft and has been widely proposed by the present applicant.

JP 2017-170105 A

Although the system of Patent Document 1 can calculate an IFC suitable for a golfer and recommend a shaft that matches this, such a shaft does not necessarily meet the golfer's needs exactly. For example, a golfer may wish to select a shaft that prioritizes their own feeling rather than the ideal shaft recommended by the system. However, the system of Patent Document 1 was unable to fully meet the needs of such golfers.

The present invention aims to provide a fitting device and program that can suggest a shaft that better meets the needs of a golfer.

The fitting device according to the first aspect includes an analysis unit that derives an optimal stiffness index, which is a stiffness index including stiffness values at multiple positions of a shaft included in a golf club and is suitable for the golfer, based on measurement data obtained by measuring a golf swing by a golfer using a measuring device, a screen creation unit that creates a screen displaying at least one of the optimal stiffness index and a candidate shaft that is a shaft that matches the optimal stiffness index, and an adjustment unit that accepts input of request data indicating the requests of the golfer based on the test-hitting results of golf clubs including the candidate shafts, and derives an adjusted stiffness index by adjusting the optimal stiffness index in accordance with the request data. The screen creation unit creates a screen displaying at least one of the adjusted stiffness index and a recommended shaft that is a shaft that matches the adjusted stiffness index.

The fitting device according to the second aspect is the fitting device according to the first aspect, and when data indicating that a stiffer shaft is desired is input as the desired data, the adjustment unit derives the adjusted stiffness index by increasing all of the multiple stiffness values included in the optimal stiffness index, or by increasing only the stiffness values at one or more positions on the grip side of the shaft among the multiple stiffness values included in the optimal stiffness index.

The fitting device according to the third aspect is the fitting device according to the first or second aspect, and when data indicating that a softer shaft is desired is input as the desired data, the adjustment unit derives the adjusted stiffness index by reducing all of the stiffness values included in the optimal stiffness index, or by reducing only the stiffness values at one or more positions on the grip side of the shaft among the stiffness values included in the optimal stiffness index.

The fitting device according to the fourth aspect is a fitting device according to any one of the first to third aspects, and when data indicating that the ball direction is desired to be directed to the left is input as the desired data, the adjustment unit derives the adjusted stiffness index by reducing only the stiffness values at one or more positions on the tip side of the shaft out of the multiple stiffness values included in the optimal stiffness index.

The fitting device according to the fifth aspect is a fitting device according to any one of the first to third aspects, and when data indicating that the ball direction is desired to be directed to the left is input as the desired data, the adjustment unit reduces only the stiffness values at multiple positions on the tip side of the shaft out of the multiple stiffness values included in the optimal stiffness index, and at this time, derives the adjusted stiffness index by reducing the stiffness values at the multiple positions by different levels.

The fitting device according to the sixth aspect is a fitting device according to any one of the first to fifth aspects, and when data indicating that the ball direction is desired to be directed to the right is input as the desired data, the adjustment unit derives the adjusted stiffness index by increasing only the stiffness values at one or more positions on the tip side of the shaft out of the multiple stiffness values included in the optimal stiffness index.

The fitting device according to the seventh aspect is a fitting device according to any one of the first to fifth aspects, and when data indicating that the ball direction is desired to be directed to the right is input as the desired data, the adjustment unit increases only the stiffness values at multiple positions on the tip side of the shaft out of the multiple stiffness values included in the optimal stiffness index, and at this time, derives the adjusted stiffness index by increasing the stiffness values at the multiple positions by different levels.

The fitting device according to the eighth aspect is a fitting device according to any one of the first to seventh aspects, in which the stiffness index includes stiffness values at at least three positions on the shaft.

The fitting program according to the ninth aspect causes a computer to execute the following: derive an optimal stiffness index, which is a stiffness index including stiffness values at multiple positions of a shaft included in a golf club and is suitable for the golfer, based on measurement data obtained by measuring a golf swing by a golfer using a measuring device; create a screen displaying at least one of the optimal stiffness index and a candidate shaft that is a shaft that matches the optimal stiffness index; accept input of request data indicating the requests of the golfer based on the test-hitting results of a golf club including the candidate shaft, derive an adjusted stiffness index by adjusting the optimal stiffness index in accordance with the request data; and create a screen displaying at least one of the adjusted stiffness index and a recommended shaft that is a shaft that matches the adjusted stiffness index.

Based on the above perspective, it is possible to propose a shaft that better meets the needs of golfers.

1 is an overall configuration diagram of a fitting system including a fitting device (computer) according to one embodiment of the present invention. FIG. 2 is a functional block diagram showing the electrical configuration of the fitting system of FIG. 1 . 11 is a flowchart showing the flow of a fitting process. A diagram explaining the International Flex Code (IFC). 1 is a diagram illustrating the bending of a shaft during a golf swing. An example of an analysis results screen that displays the analysis results of a golf swing. 13 is an example of a shaft selection screen displaying optimal stiffness index and candidate shafts. 13 is an example of a shaft selection screen displaying an optimal stiffness index, candidate shafts, and stiffness indices of the candidate shafts. 13 is an example of a shaft selection screen displaying adjustment stiffness index and recommended shafts. 13 is another example of a shaft selection screen displaying an adjustment stiffness index and a recommended shaft. 13 is yet another example of a shaft selection screen displaying an adjustment stiffness index and a recommended shaft. 13 is yet another example of a shaft selection screen displaying an adjustment stiffness index and a recommended shaft. 13 is an example of a shaft selection screen displaying an adjustment stiffness index, a recommended shaft, and a stiffness index of the recommended shaft. 13 is another example of a shaft selection screen displaying an adjustment stiffness index, a recommended shaft, and a stiffness index of the recommended shaft. 13 is yet another example of a shaft selection screen displaying an adjustment stiffness index, a recommended shaft, and a stiffness index of the recommended shaft. 13 is yet another example of a shaft selection screen displaying an adjustment stiffness index, a recommended shaft, and a stiffness index of the recommended shaft.

The following describes a golf club shaft fitting device and program according to one embodiment of the present invention, with reference to the drawings.

1. Overview of fitting system
FIG. 1 shows an overall configuration diagram of a fitting system 100 including a computer 1 as a fitting device for a golf club shaft according to this embodiment, and FIG. 2 shows its electrical configuration. The fitting system 100 is a system for selecting one or more shafts suitable for a golfer G from among a large number of golf club shafts, in other words, for fitting one or more shafts to a golfer G. The fitting is performed by the golfer G trying out one or more test golf clubs (which may include golf clubs that the golfer G normally uses; hereinafter, referred to as test clubs) 4, and determining a shaft (hereinafter, referred to as a recommended shaft) suitable for the golfer G that should ultimately be recommended to the golfer G. At this time, preferably, a specialized staff member called a fitter appropriately navigates the fitting of the shaft while observing the golfer G trying out the test clubs 4.

The fitting system 100 includes a measuring device 2 that measures the manner in which golfer G tries out a test club 4. A computer 1 analyzes the measurement data collected by the measuring device 2, and performs a golf swing analysis and shaft fitting. The user proceeds with the fitting while referring to the analysis results of golfer G's golf swing presented by computer 1. Note that the user here is a general term for anyone who requires the results of the golf swing analysis and fitting, and is primarily intended to refer to golfer G, but may also include the fitter if one is present. The computer 1 displays the results of the golf swing analysis based on the measurement data to the user, and also displays the results of the fitting based on the measurement data to the user.

Below, we will explain the configuration of the measuring device 2 and computer 1, and then explain the flow of shaft fitting performed using the fitting system 100.

<2. Configuration of each part>
<2-1. Measuring equipment>
The measuring device 2 is installed at a tee box where a golfer G takes a test shot in a specialized location such as a golf goods store or a golf school, and measures the shot (golf swing) of the golfer G at the tee box. The measurement data measured by the measuring device 2 is transmitted to a computer 1 connected to the measuring device 2.

As shown in FIG. 2, the measuring device 2 according to this embodiment includes an inertial sensor unit 3 and a camera system 5. However, the configuration of the measuring device 2 is not limited to this, and is not particularly limited as long as it is capable of measuring measurement data suitable for analyzing a golf swing by golfer G. Golfer G test-hits a test club 4 to which an inertial sensor unit 3 is attached, at a hitting box where the camera system 5 is installed. The test club 4 is a typical 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.

<2-1-1. Inertial sensor unit>
1, the inertial sensor unit 3 is attached to the end of the grip 42 of the test club 4 opposite the head 41, and measures the behavior of the test club 4 during a golf swing. However, the inertial sensor unit 3 can also be attached to another location such as the head 41 or the shaft 40. The inertial sensor unit 3 is configured to be small and lightweight so as not to interfere with the swing motion of the golfer G. The inertial sensor unit 3 may be detachable from the test club 4, or may be fixed so as not to be removable.

As shown in FIG. 2, the inertial sensor unit 3 is equipped with an acceleration sensor 31, an angular velocity sensor 32, and a geomagnetic sensor 33. These sensors 31 to 33 are triaxial sensors that detect data on accelerations a _x , a _y , and a _z , angular velocities ω _x , ω _y , and ω _z , and geomagnetic fields m _x , m _y , and m _z in an xyz local coordinate system with the mounting positions of these sensors 31 to 33 as the origin. The inertial sensor unit 3 is also equipped with a communication device 34 for transmitting the measurement data output from these sensors 31 to 33 to an external computer 1. In this embodiment, the communication device 34 is wireless so as not to interfere with the swing motion, but it may be connected to the computer 1 in a wired manner via a cable.

<2-1-2. Camera system>
As shown in Fig. 1 and Fig. 2, 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 photography. The camera 51 is fixed to a support base 57 in front of the golfer G so that the head 41 and the ball 60 before and after impact can be photographed from above, and is disposed diagonally above the ball 60 at address. The strobes 53 and 53 are also fixed to the support base 57 and disposed below the camera 51. The camera 52 is disposed in front of the ball 60 at address in front of the golfer G so that the head 41 and the ball 60 before and after impact can be photographed from a position different from the camera 51. The strobes 54 and 54 are disposed on the left and right of the camera 52. The head 41 and the ball 60 are provided with markers having shapes such as dots and lines as appropriate so that the behavior of the head 41 and the ball 60 can be easily extracted from the image data photographed by the cameras 51 and 52.

The camera system 5 also includes light projectors 55A and 55B and light receivers 56A and 56B. The light projector 55A and the light receiver 56A constitute one timing sensor, and the light projector 55B and the light receiver 56B constitute another timing sensor. The timing signals generated by these timing sensors are used to determine the timing of the emission of the strobes 53, 53, 54, and 54 and the subsequent photographing by the cameras 51 and 52.

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, ROM, RAM, etc., and is connected to the above devices 51 to 56B as well as to the communication unit 15 of the computer 1.

The projectors 55A and 55B are disposed below the camera 51 near the ground in front of the golfer G. On the other hand, the receivers 56A and 56B are disposed near the toes of the golfer G at the plate. The projector 55A and the receiver 56A are disposed on a line that is approximately parallel to the direction from the back to the stomach of the golfer G, and face each other. The same is true for the projector 55B and the receiver 56B. The projectors 55A and 55B constantly emit light toward the receivers 56A and 56B, respectively, during a golf swing, and the receivers 56A and 56B receive the light. However, at the timing when the test club 4 passes between the projectors 55A and 55B and the receivers 56A and 56B, the light from the projectors 55A and 55B is blocked by the test club 4, and the receivers 56A and 56B cannot receive the light. The photoreceivers 56A and 56B detect this timing and generate a timing signal in response to it. The control device 50 commands the strobes 53, 53, 54, and 54 to emit light and commands the cameras 51 and 52 to take pictures at a predetermined timing based on the time the timing signal was generated. The image data captured by the cameras 51 and 52 is sent to the control device 50 as measurement data, and is further sent from the control device 50 to the computer 1.

<2-2. Computer>
As the name suggests, the computer 1 is a general-purpose computer in terms of hardware, and is realized as, for example, a desktop computer, a laptop computer, a tablet computer, or a smartphone. As shown in Fig. 2, a program 13a, which is a fitting program according to this embodiment, is installed in the computer 1. The program 13a is acquired from a recording medium such as a CD-ROM that can be read by the computer 1, or from another computer on a communication network such as a local area network (LAN) or the Internet to which the computer 1 is connected. The program 13a is software for supporting shaft fitting based on measurement data transmitted from the measuring device 2, and causes the computer 1 to execute the operations described below.

The computer 1 comprises a display 11, an input unit 12, a memory unit 13, a control unit 14, and a communication unit 15. These units 11 to 15 are connected to each other via a communication line 16 such as a bus line, and can communicate with each other. The display 11 may be integrated into the main body of the computer 1 (the housing that houses the control unit 14, etc.), or may be external.

The storage unit 13 is composed of a non-volatile storage device such as a hard disk or a flash memory. In addition to storing a program 13a, the storage unit 13 also saves measurement data transmitted from the measuring device 2. The storage unit 13 also stores a shaft database (DB) 17. The shaft DB 17 stores information indicating various specifications of a large number of shafts (including rank values _K1 to _K4 constituting the IFC described below) in association with information specifying the type of shaft.

The control unit 14 is composed of a CPU, ROM, RAM, etc. The control unit 14 reads and executes the program 13a in the storage unit 13, and virtually operates as an analysis unit 14a, a screen creation unit 14b, and an adjustment unit 14c. The operation of each unit 14a to 14c will be described in detail later. The communication unit 15 functions as a communication interface that establishes a connection with a communication network such as a LAN or the Internet, and enables data communication with external devices including the measuring instrument 2 via this communication network. The input unit 12 is composed of a mouse, keyboard, touch panel, etc., and accepts operations from the user on the computer 1. The display 11 is composed of a liquid crystal display, etc., and displays various information to the user, including the analysis results of the golf swing by the control unit 14 and the fitting results.

<3. Shaft fitting>
Next, there will be described the flow of shaft fitting carried out using the fitting system 100. Fig. 3 is a flowchart showing the flow of the fitting process executed by the computer 1 during shaft fitting.

First, the user operates the input unit 12 to input to the computer 1 that a test shot will be performed (step S1), and then the golfer G performs a test shot with the test club 4 at the hit box. At this time, the golfer G performs a golf swing once or multiple times with respect to one test club 4. The measurement device 2 collects measurement data obtained by measuring the golf swing by the golfer G. Meanwhile, when the analysis unit 14a of the computer 1 receives an input from the user via the input unit 12 that a test shot will be performed (yes in step S1), it acquires the measurement data from the measurement device 2 via the communication unit 15 (step S2). More specifically, when the test club 4 is swung and the ball 60 is hit, the inertial sensor unit 3 measures time series data of the accelerations a _x , a _y , and a _z , the _angular velocities ω _x , ω y , and ω _{z ,} and the geomagnetic fields m _x , my _y , and m _z of the grip 42 at least from the address to the finish during this golf swing. These time series data are transmitted as measurement data from the inertial sensor unit 3 to the computer 1, which is received by the analysis unit 14a and stored in the memory unit 13. In parallel with the measurement by the inertial sensor unit 3, the camera system 5 captures image data showing the state of the head 41 and the vicinity of the ball 60 before and after impact during this golf swing. These image data are also transmitted as measurement data to the computer 1 via the control device 50, which is received by the analysis unit 14a and stored in the memory unit 13.

In the next step S3, the analysis unit 14a analyzes the measurement data each time the measurement data for one golf swing is stored in the memory unit 13. More specifically, the analysis unit 14a analyzes the golf swing based on the measurement data in the memory unit 13, and derives values (hereinafter referred to as swing characteristic values) that represent the characteristics of the golf swing of the golfer G. In this embodiment, the swing characteristic values calculated are the head speed just before the impact, the ball speed just after the impact, the meet rate, the vertical launch angle, the backspin amount, the left and right launch angle (also called the left and right swing angle), the side spin amount, the left and right flight distance (also called the left and right deviation), the flight distance of the carry only, the total flight distance of the carry and run, the opening amount of the face, the trajectory angle of the head 41, and the impact point (left and right impact point) on the face surface. In addition, the trajectory of the ball 60 is also calculated as the swing characteristic value. However, these are examples, and it is not necessary to derive all of the swing characteristic values listed here, and other swing characteristic values may be derived. There are various known methods for deriving swing characteristic values based on the above-mentioned measurement data, so a detailed explanation will be omitted here.

In step S3, the analysis unit 14a derives a stiffness index (hereinafter referred to as an optimal stiffness index) suitable for the golfer G, which is a stiffness index including stiffness values at multiple positions of the shaft, based on the measurement data in the memory unit 13. The stiffness index of the shaft in this embodiment is evaluated as a distribution of bending stiffness at multiple positions of the shaft (hereinafter sometimes referred to as an EI distribution). The EI distribution according to this embodiment is quantitatively expressed using numerical values, more specifically, it is expressed using the International Flex Code (IFC). Here, this IFC will be explained. Note that the IFC is a known index indicating the characteristics of a shaft that has been widely proposed by the present applicant, and has already been explained in detail in various documents, including Patent Document 1, for example. Therefore, it is not necessarily necessary to explain it again here, but a brief explanation will be given here for reference.

As shown in Fig. 4, the IFC is a code in which the bending stiffness of the shaft at four positions H1 to H4 along the direction of extension of the shaft is expressed by a single digit number from 0 to 9, and these four numbers are arranged along the direction of extension of the shaft. More specifically, four measurement points H1 to H4 are defined in this order from the butt end to the tip end of the shaft at approximately regular intervals. For example, the measurement point H1 can be a point 36 inches from the tip end of the shaft, the measurement point H2 can be a point 26 inches, the measurement point H3 can be a point 16 inches, and the measurement point H4 can be a point 6 inches. Then, the bending stiffness values (hereinafter sometimes referred to as EI values) _J1 to _J4 at each of these four measurement points H1 to H4 are measured.

Next, the EI values _J1 to _J4 at the four measurement points H1 to H4 are converted into rank values _K1 to _K4 on a 10-level scale. Specifically, the rank values _K1 to _K4 can be calculated from the EI values _J1 to _J4 according to conversion rules prepared for each of the measurement points H1 to H4. The four rank values _K1 to _K4 thus assigned to the measurement points H1 to H4 are then arranged so that the value corresponding to the butt side is on the left and the value corresponding to the tip side is on the right. The four-digit code thus obtained is the IFC. In the IFC, the larger the value of each digit, the higher the rigidity at the corresponding position.

In step S3, as described above, an IFC suitable for golfer G is derived as the optimal stiffness index. To this end, first, the analysis unit 14a calculates the first to fourth feature amounts F ₁ to F ₄ based on the measurement data stored in the storage unit 13. The first to fourth feature amounts F 1 to F ₄ are indexes for determining the optimal EI values J _S1 to J _{S4 which are the EI values J 1 to J 4 suitable for} golfer G _, respectively, and the optimal rank values K _S1 to K _S4 which are the rank values K ₁ to K ₄ suitable for golfer G. As is clear from the above, the number string in which the optimal rank values K _S1 to K _S4 are arranged from left to right is the optimal stiffness index (IFC) in this embodiment. In this embodiment, the following feature amounts having a correlation with the optimal EI values J _S1 to J _S4 are calculated as the first to fourth feature amounts F ₁ to F ₄ , respectively. However, the index (feature amount) for determining the optimal stiffness index is not limited to this.

The first feature amount _F1 is the gradient of the angular velocity _ωy in the cocking direction near the top, and can be expressed, for example, as the sum of the angular velocity _ωy 50 ms before the top and the angular velocity _ωy 50 ms after the top.

The second feature value _F2 is the average value of the angular velocity _ωy from the top to the point at which the angular velocity _ωy is maximum. The second feature value _F2 is calculated by first determining the point at which the angular velocity _ωy is maximum between the top and impact, and then dividing the cumulative value of the angular velocity _ωy from the top to this point by the time from the top to this point.

The third feature value _F3 is the average value of the angular velocity _ωy from the time when the angular velocity _ωy is maximum to the impact, and is calculated by dividing the cumulative value of the angular velocity _ωy from the time when the angular velocity _ωy is maximum to the impact by the time from the time when the angular velocity _{ωy is} maximum to the impact.

The fourth feature amount _F4 is an average value of the angular velocity _ωy from the top to the impact, and is calculated by dividing the cumulative value of the angular velocity _ωy from the top to the impact by the time from the top to the impact.

During a golf swing, the shaft of a golf club is bent due to the inertia of the relatively heavy head at its tip. This bending does not occur at the same point on the shaft throughout the entire golf swing, but is transmitted from the grip side of the shaft to the tip side as the golf swing progresses from the top to impact, as shown in Figure 5. In other words, as the golf swing progresses from the top to impact, the position of the bend in the shaft moves from the grip side to the tip side of the shaft.

More specifically, when the golfer takes the ball back from the address position and reaches the top (point (1) in Figure 5), the shaft is bent near the grip. Then, when the golfer turns around and reaches the beginning of the downswing (point (2) in Figure 5), the bend moves slightly toward the tip of the shaft. Furthermore, when the golfer's arms become horizontal (point (3) in Figure 5), the bend moves toward the tip of the shaft rather than the center. Then, just before impact (point (4) in Figure 5), the bend moves to the vicinity of the tip of the shaft.

Therefore, the first to fourth feature quantities _F1 to _F4 can be calculated based on the measurement data in the first to fourth sections from near the top to near the impact during the golf swing. The first to third sections are sections along the time course in this order, and may or may not overlap with each other.

The analysis unit 14a selects an optimal stiffness index (IFC) in accordance with the first to fourth feature amounts F ₁ to F _4. In this embodiment, the optimal EI values J _S1 to J _S4 are calculated based on the following approximation formula that represents the correlation between the first to fourth feature amounts F ₁ to F ₄ and the optimal EI values J _S1 to J _S4 :
J _S1 = a ₁ · F ₁ + b ₁
J _S2 = a ₂ · F ₂ + b ₂
J _S3 = a ₃ · F ₃ + b ₃
J _S4 = a ₄ · F ₄ + b ₄

In the above formula, _a1 to _a4 and _b1 to _b4 are constants that are determined in advance by regression analysis based on a large number of data sets obtained by experiments and are stored in advance in the storage unit 13. Note that methods for deriving _a1 to _a4 and _b1 to _b4 are disclosed in, for example, Patent Document 1 and JP2013-226375A, and therefore detailed explanations thereof will be omitted here.

The analysis unit 14a calculates the optimal EI values J _S1 to J _S4 by substituting the first to fourth feature amounts F ₁ to F ₄ into the above approximation formula. Then, the analysis unit 14a converts the optimal EI values J _S1 to J _S4 into optimal rank values K _S1 to K _S4 , respectively, in accordance with a predetermined conversion rule. Then, the optimal rank values K _S1 to K _S4 are combined to determine the optimal stiffness index (IFC).

In step S3, the analysis unit 14a determines a shaft (hereinafter, referred to as a candidate shaft) that matches the optimal stiffness index (IFC) as a candidate for a recommended shaft to be recommended to the golfer G. More specifically, the analysis unit 14a searches the shaft DB 17 to extract one or more shafts that match the optimal stiffness index as candidate shafts. Note that the "shaft that matches the optimal stiffness index" in this embodiment may include not only a shaft having a stiffness index (IFC) that is completely the same as the optimal stiffness index, but also a shaft having a stiffness index (IFC) similar to the optimal stiffness index. Whether or not a shaft in the shaft DB 17 matches the optimal stiffness index is determined based on the degree of agreement defined, for example, according to the following formula 1. This degree of agreement is the sum of the differences between the rank values K ₁ to K ₄ of the shafts in the shaft DB 17 and the optimal rank values K _S1 to K _S4 that constitute the optimal stiffness index, and the smaller the value, the higher the degree of agreement. In addition, as the candidate shafts, a predetermined number of shafts that have a relatively high degree of match among the shafts registered in shaft DB17 may be identified, or all shafts that have a certain degree of match or higher may be identified.

The swing characteristic values derived in step S3 are displayed on an analysis result screen W1 as shown in FIG. 6 (step S4). The analysis result screen W1 is created by the screen creation unit 14b and displayed on the display 11. A table T1 for displaying a list of swing characteristic values is arranged on the analysis result screen W1. Then, every time the swing characteristic values for one golf swing are calculated, the swing characteristic values are input to this table T1. In the table T1, a set of swing characteristic values for the first stroke is displayed on the first line, a set of swing characteristic values for the second stroke is displayed on the second line, and the same applies for the third stroke and onwards. The bottom row of the table T1 displays the average value of the swing characteristic values for multiple golf swings. In addition, a graphic T2 representing the trajectory of the ball 60 corresponding to the above golf swing is displayed below the table T1. In the graphic T2, the trajectory of the ball 60 is displayed for the number of strokes of the golf swing.

The user can switch between screens on the display 11 by operating the input unit 12. In response to the user's operation, the screen creation unit 14b creates a shaft selection screen W2 in addition to the analysis result screen W1, and displays them on the display 11 (step S4). Both the optimal stiffness index and the candidate shafts are displayed on the shaft selection screen W2. In the example of FIG. 7, the optimal stiffness index (7755) is displayed as text and graphics in area A1, and the candidate shafts are displayed in a list in area A2.

In area A2, a button B1 for selecting a candidate shaft is displayed next to the name of the candidate shaft. When the screen creation unit 14b detects that one of the buttons B1 has been pressed by the user (yes in step S5), it updates the shaft selection screen W2 and displays in area A1 the stiffness index (IFC) of the candidate shaft corresponding to the button B1 (step S6). Figure 8 is an example of the screen W2 when one button B1 has been pressed. In this example, in addition to the optimal stiffness index (7755), the stiffness index (6644) of the selected candidate shaft is displayed in area A1.

The user selects a new test club 4 for the next test shot by golfer G while viewing the swing characteristic values, optimal stiffness index, and stiffness index of the candidate shaft on the analysis result screen W1 and shaft selection screen W2. As the new test club 4, a golf club having a shaft selected from one or more candidate shafts is selected.

After selecting a new test club 4, the user operates the input unit 12 to input to the computer 1 that the next test shot will be performed. As shown in FIG. 3, the user may input to the computer 1 that the test shot will be performed without selecting a candidate shaft on the shaft selection screen W2 (no in step S5). After the test shot is input, the golfer G test-hits the new test club 4 at the tee. At this time, the golfer G also performs a golf swing once or multiple times for one test club 4. The measuring device 2 collects measurement data obtained by measuring the golf swing of the new test club 4 by the golfer G. On the other hand, when the analysis unit 14a receives an input from the user that the test shot will be performed via the input unit 12 (yes in step S7), the analysis unit 14a acquires the measurement data from the measuring device 2 via the communication unit 15 and stores it in the memory unit 13 (step S8) in the same manner as in step S2. In the subsequent step S9, the analysis unit 14a derives the swing characteristic value by analyzing the measurement data in the memory unit 13 in the same manner as in step S3. Also, in step S9, the screen creation unit 14b displays the newly derived swing characteristic value on the analysis result screen W1, similar to step S4.

The user, while appropriately referring to the new swing characteristic values displayed on the analysis result screen W1, determines the needs of golfer G when ultimately deciding on a recommended shaft to be recommended to golfer G based on the test shot results of the test club 4 including one of the candidate shafts. The test shot results of the test club 4 here typically refer to the feeling of golfer G at the time of the test shot.

In this embodiment, the following four requirements of the golfer G are considered.
(Request 1) The candidate shaft of test club 4 that was tried out felt soft or light, so a stiffer shaft would be selected.
(Request 2) The candidate shaft of test club 4 that was tried out felt to be stiff or heavy, so a softer shaft would be preferred.
(Request 3) With the candidate shaft for test club 4 that was tried out, the ball trajectory heads to the right, and since it would be desirable to catch the ball more, it would be desirable to select a shaft that would point the ball more to the left.
(Request 4) With the candidate shaft for test club 4 that was tried out, the ball trajectory headed to the left, and since it would be better to let the ball escape further, it would be desirable to select a shaft that would point the ball more to the right.

As shown in Figures 7 and 8, buttons B21 to B24 corresponding to the above needs 1 to 4 are displayed on the shaft selection screen W2. The user can input data indicating golfer G's needs (hereinafter referred to as need data) to the computer 1 by operating the input unit 12 and pressing one of these buttons B21 to B24.

The adjustment unit 14c of the computer 1 accepts the input of request data corresponding to one of the requests 1 to 4 through the buttons B21 to B24 on the shaft selection screen W2 (steps S10 to S13). As shown in FIG. 3, the adjustment unit 14c can accept the input of request data even if the golfer G does not test a new test club 4 (no in step S7). In this case, steps S8 and S9 are also omitted, so the user determines the request of the golfer G without referring to the test result of the test club 4 including one of the candidate shafts. After that, if the button B21 corresponding to request 1 is selected, step S14 is executed, if the button B24 corresponding to request 2 is selected, step S15 is executed, if the button B22 corresponding to request 3 is selected, step S16 is executed, and if the button B23 corresponding to request 4 is selected, step S17 is executed. In these steps S14 to S17, the adjustment unit 14c derives a stiffness index (hereinafter referred to as an adjusted stiffness index) by adjusting the optimal stiffness index according to the desired data input by the user.

Step S14 corresponding to the request 1 is executed when the request data indicating that a stiffer shaft is requested is input. In step S14 of this embodiment, the adjustment unit 14c derives the adjusted stiffness index by increasing all of the multiple stiffness values included in the optimal stiffness index derived in step S3. In this case, for example, the adjusted stiffness index can be an index obtained by increasing all of the optimal rank values K _S1 to K _S4 constituting the optimal stiffness index by 1, and if the optimal stiffness index (IFC) is 7755, the adjusted stiffness index (IFC) becomes 8866. Alternatively, in another embodiment, the adjustment unit 14c may derive the adjusted stiffness index by increasing only stiffness values at one or more positions (not all positions) on the grip side of the shaft among the multiple stiffness values included in the optimal stiffness index derived in step S3. In this case, for example, the adjusted stiffness index can be an index obtained by increasing one or more (not all) of the optimal rank values K _S1 to K _S4 constituting the optimal stiffness index on the proximal side by one, and if the optimal stiffness index (IFC) is 7755, the adjusted stiffness index (IFC) will be 8755, 8855, or 8865.

When Demand 1 is selected, the adjustment stiffness index as described above is calculated for the following reason. That is, according to the inventors' investigations, the stiffness of the shaft depends on the stiffness of the part of the shaft that is closer to the grip. Therefore, it is desirable to select a recommended shaft with a larger stiffness value at least in a part closer to the grip. Note that in the case of a four-digit IFC, it is desirable to increase the stiffness values of the two parts closer to the grip. However, if only the stiffness value of a part closer to the grip is changed, the overall characteristics of the shaft will change, and the feeling may also change significantly, so it is also desirable to change the stiffness value of the entire shaft.

In step S14, the adjustment unit 14c determines a shaft that matches the adjustment stiffness index as a recommended shaft to be recommended to the golfer G. More specifically, the adjustment unit 14c searches the shaft DB 17 as in step S3, and extracts one or more shafts that match the adjustment stiffness index as recommended shafts. Note that the "shaft that matches the adjustment stiffness index" in this embodiment may include not only a shaft that has a stiffness index (IFC) that is completely the same as the adjustment stiffness index, but also a shaft that has a stiffness index (IFC) similar to the adjustment stiffness index. Whether or not a shaft in the shaft DB 17 matches the adjustment stiffness index is determined based on the degree of agreement defined, for example, according to the formula 1. Note that, as the recommended shaft, a predetermined number of shafts that have a relatively high degree of agreement among the shafts registered in the shaft DB 17 may be specified, or all shafts that have a certain degree of agreement or higher may be specified.

Moreover, step S15 corresponding to the request 2 is executed when the request data indicating that a softer shaft is requested is input. In step S15 of this embodiment, the adjustment unit 14c derives the adjusted stiffness index by reducing all of the multiple stiffness values included in the optimal stiffness index derived in step S3. In this case, for example, the adjusted stiffness index can be an index obtained by reducing all of the optimal rank values K _S1 to K _S4 constituting the optimal stiffness index by one each, and if the optimal stiffness index (IFC) is 7755, the adjusted stiffness index (IFC) is 6644. Alternatively, in another embodiment, the adjustment unit 14c may derive the adjusted stiffness index by reducing only the stiffness values at one or more positions (not all positions) on the grip side of the shaft among the multiple stiffness values included in the optimal stiffness index derived in step S3. In this case, for example, the adjusted stiffness index can be an index obtained by decreasing one or more (not all) of the optimal rank values K _S1 to K _S4 constituting the optimal stiffness index on the proximal side by one, and if the optimal stiffness index (IFC) is 7755, the adjusted stiffness index (IFC) will be 6755, 6655, or 6645.

When Demand 2 is selected, the adjustment stiffness index as described above is calculated for the following reason. That is, according to the inventors' investigation, the flexibility of the shaft depends on the flexibility of the part of the shaft that is closer to the grip. Therefore, as a recommended shaft that satisfies Demand 2, it is desirable to select a shaft with a smaller stiffness value at least in a part closer to the grip. Note that in the case of a four-digit IFC, it is desirable to reduce the two stiffness values on the grip side. However, if only the stiffness value of a part closer to the grip is changed, the overall characteristics of the shaft will change and the feeling may also change significantly, so it is also desirable to change the stiffness value of the entire shaft.

In step S15, the adjustment unit 14c determines a shaft that matches the adjustment stiffness index as a recommended shaft to be recommended to the golfer G. More specifically, the adjustment unit 14c searches the shaft DB 17 in the same manner as in step S14, and extracts one or more shafts that match the adjustment stiffness index as recommended shafts.

Step S16 corresponding to the request 3 is executed when the request data indicating that a shaft that directs the ball more to the left is requested in order to catch the ball better is input. In step S16 of this embodiment, the adjustment unit 14c derives the adjusted stiffness index by decreasing only the stiffness values at one or more positions (not all positions) on the tip side of the shaft among the multiple stiffness values included in the optimal stiffness index derived in step S3. In this case, for example, the adjusted stiffness index can be an index obtained by decreasing one or more values (not all values) on the tip side of the optimal rank values K _S1 to K _S4 constituting the optimal stiffness index by one, and if the optimal stiffness index (IFC) is 7755, the adjusted stiffness index (IFC) can be 7754, 7744, or 7644.

However, in this embodiment, the adjustment unit 14c derives the adjusted stiffness index by reducing stiffness values at multiple positions (not all positions) on the tip side of the shaft by different levels among the multiple stiffness values included in the optimal stiffness index. That is, a gradient is applied to the degree of change of the stiffness value on the tip side of the shaft. In this case, for example, the adjusted stiffness index can be an index in which two values on the tip side of the optimal rank values K _S1 to K _S4 constituting the optimal stiffness index are reduced, and among these, the value on the tip side is reduced by 2, and the value on the second tip side is reduced by 1. In this example, if the optimal stiffness index (IFC) is 7755, the adjusted stiffness index (IFC) is 7743.

When requirement 3 is selected, the adjustment stiffness index as described above is calculated for the following reason. That is, according to the inventors' investigation, the ball's catch depends on the stiffness of the shaft's tip, and the softer the tip, the easier it is to catch the ball. Therefore, as a recommended shaft that satisfies requirement 3, it is desirable to select a shaft with a small stiffness value on part of the tip side. Note that, in the case of a four-digit IFC, it is desirable to make the two stiffness values on the tip side small. Also, when making multiple stiffness values on the tip side small, it is possible to give a gradient to the degree of change in the stiffness value on the tip side of the shaft, and in this case, it is also possible to give a gradient so that the degree of change becomes greater as it approaches the tip side.

In step S16, the adjustment unit 14c determines a shaft that matches the adjustment stiffness index as a recommended shaft to be recommended to the golfer G. More specifically, the adjustment unit 14c searches the shaft DB 17 in the same manner as in step S14, and extracts one or more shafts that match the adjustment stiffness index as the recommended shaft.

Step S17 corresponding to the request 4 is executed when the request data indicating that a shaft that directs the ball further to the right in order to allow the ball to escape further is input. In step S17 of this embodiment, the adjustment unit 14c derives the adjusted stiffness index by increasing only the stiffness values at one or more positions (not all positions) on the tip side of the shaft among the multiple stiffness values included in the optimal stiffness index derived in step S3. In this case, for example, the adjusted stiffness index can be an index obtained by increasing one or more values (not all values) on the tip side of the optimal rank values K _S1 to K _S4 constituting the optimal stiffness index by one, and if the optimal stiffness index (IFC) is 7755, the adjusted stiffness index (IFC) can be 7756, 7766, or 7866.

However, in this embodiment, the adjustment unit 14c derives the adjusted stiffness index by increasing stiffness values at multiple positions (not all positions) on the tip side of the shaft by different levels among the multiple stiffness values included in the optimal stiffness index. That is, a gradient is applied to the degree of change of the stiffness value on the tip side of the shaft. In this case, for example, the adjusted stiffness index can be an index in which two values on the tip side of the optimal rank values K _S1 to K _S4 constituting the optimal stiffness index are increased, and among these, the value on the most tip side is increased by 2, and the value on the second most tip side is increased by 1. In this example, if the optimal stiffness index (IFC) is 7755, the adjusted stiffness index (IFC) is 7767.

When requirement 4 is selected, the adjustment stiffness index as described above is calculated for the following reason. That is, according to the inventors' investigation, the stiffer the tip of the shaft, the easier it is for the ball to escape. Therefore, as a recommended shaft that satisfies requirement 4, it is desirable to select a shaft with a large stiffness value on part of the tip side. Note that, in the case of a four-digit IFC, it is desirable to increase the two stiffness values on the tip side. Also, when increasing multiple stiffness values on the tip side, it is possible to give a gradient to the degree of change in the stiffness value on the tip side of the shaft, and in this case, it is also possible to give a gradient so that the degree of change becomes greater as it approaches the tip side.

In step S17, the adjustment unit 14c determines a shaft that matches the adjustment stiffness index as a recommended shaft to be recommended to the golfer G. More specifically, the adjustment unit 14c searches the shaft DB 17 in the same manner as in step S14, and extracts one or more shafts that match the adjustment stiffness index as recommended shafts.

In step S18 following steps S14 to S17, the screen creation unit 14b updates the shaft selection screen W2 and displays both the adjustment stiffness index and the recommended shaft on the shaft selection screen W2 as shown in Figs. 9 to 12. Figs. 9 to 12 are screen examples corresponding to requests 1 to 4, respectively. In these screen examples, as in the example of Fig. 7, the adjustment stiffness index (8866, 6644, 7743, 7767) is displayed as text and graphics in area A1, and the recommended shaft is displayed in a list in area A2.

In area A2, a button B3 for selecting the recommended shaft is displayed next to the name of the recommended shaft. When the screen creation unit 14b detects that one of the buttons B3 has been pressed by the user, it updates the shaft selection screen W2 and displays the stiffness index (IFC) of the recommended shaft corresponding to the button B3 in area A1, as shown in Figs. 13 to 16. Figs. 13 to 16 are screen examples corresponding to requests 1 to 4, respectively, and are examples of screen W2 when one button B3 is pressed on the screens of Figs. 9 to 12. In the examples of Figs. 13 to 16, in addition to the adjustment stiffness indexes (8866, 6644, 7743, 7767), the stiffness indexes of the selected recommended shaft (7755, 7755, 7755, 7766) are displayed in area A1.

By performing step S18, the user can grasp the adjustment stiffness index and the recommended shaft. The adjustment stiffness index is a stiffness index that should be recommended to golfer G, taking into account the requests of golfer G. The recommended shaft is a shaft that should be recommended to golfer G, taking into account the requests of golfer G. A golf club that includes a recommended shaft that matches such an adjustment stiffness index can improve a golf swing by increasing the distance of a shot and reducing left-right deviation. Therefore, golfer G can easily select a shaft that can better meet his or her requests while improving his or her golf swing. After step S18, the fitting process ends.

4. Modifications
Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications are possible without departing from the spirit of the present invention. For example, the following modifications are possible. In addition, the gist of the following modifications can be combined as appropriate.

<4-1>
In the above embodiment, the inertial sensor unit 3 and the camera system 5 are used as the measuring device 2 for measuring the golf swing. However, the configuration of the measuring device 2 is not limited to this, and can be changed as appropriate. For example, a three-dimensional motion capture system or a distance image sensor may be used, or multiple types of measuring devices may be appropriately selected from the measuring devices exemplified here or other measuring devices, and these may be used in combination.

<4-2>
In the above embodiment, the bending stiffness is evaluated as the stiffness index of the shaft, but instead, the torsional stiffness may be evaluated. The value of the torsional stiffness (hereinafter, sometimes referred to as the GJ value) can also be evaluated at multiple positions along the extension direction of the shaft. That is, the distribution of the torsional stiffness at multiple positions along the extension direction of the shaft may be used as the stiffness index of the shaft. In this case, as an index (feature amount) for determining the optimal stiffness index (i.e., the optimal GJ value that is the GJ value suitable for golfer G), any index that is recognized to be correlated with the optimal GJ value and can be calculated from measurement data can be used. As such an index, for example, the following index as described in JP 2014-212862 A can be used.

(1) The magnitude of the change in angular velocity ω _x per unit time from when the angular velocity ω _y is at its maximum to the impact. (2) The amount of change in angular velocity ω _z near the top. (3) The magnitude of the change in angular velocity ω _z from the top to when the angular velocity ω _y is at its maximum during the downswing.

In addition, in the above embodiment, an index composed of stiffness values at four positions on the shaft is exemplified as the stiffness index of the shaft, but it may be an index composed of stiffness values at three positions on the shaft, an index composed of stiffness values at two positions on the shaft, or an index composed of stiffness values at five or more positions on the shaft.

<4-3>
In the above embodiment, both the optimum stiffness index and the candidate shafts are displayed on the shaft selection screen W2, but it is also possible to display only one of them. Similarly, in the above embodiment, both the adjustment stiffness index and the recommended shaft are displayed on the shaft selection screen W2, but it is also possible to display only one of them.

100 Fitting system 1 Computer (fitting device)
13a Program (Fitting Program)
14a Analysis unit 14b Screen creation unit 14c Adjustment unit 2 Measurement device 3 Inertial sensor unit (measurement device)
4 Test club 40 Shaft 41 Head 42 Grip 5 Camera system (measurement equipment)
G. Golfer

Claims (13)

An analysis unit that derives an optimal stiffness index, which is a stiffness index including stiffness values at multiple positions of a shaft included in a golf club based on measurement data obtained by measuring a golf swing by a golfer using a measuring device, and which is the stiffness index suitable for the golfer;
a screen creation unit that creates a screen displaying at least one of the optimal stiffness index and candidate shafts that match the optimal stiffness index;
an adjustment unit that receives input of request data indicating the request of the golfer based on a test hit result of a golf club including the candidate shaft, and derives an adjusted stiffness index by adjusting the optimal stiffness index in accordance with the request data,
when data indicating that a stiffer shaft is desired is input as the desired data, the adjustment unit derives the adjusted stiffness index by increasing all of the plurality of stiffness values included in the optimal stiffness index, or by increasing only the stiffness values at one or a plurality of positions on the grip side of the shaft among the plurality of stiffness values included in the optimal stiffness index,
the screen creation unit creates a screen displaying at least one of the adjustment stiffness index and a recommended shaft that matches the adjustment stiffness index.
Fitting device. An analysis unit that derives an optimal stiffness index, which is a stiffness index including stiffness values at multiple positions of a shaft included in a golf club based on measurement data obtained by measuring a golf swing by a golfer using a measuring device, and which is the stiffness index suitable for the golfer;
a screen creation unit that creates a screen displaying at least one of the optimal stiffness index and candidate shafts that match the optimal stiffness index;
an adjustment unit that receives an input of request data indicating the request of the golfer based on a test hit result of a golf club including the candidate shaft, and derives an adjusted stiffness index by adjusting the optimal stiffness index in accordance with the request data;
Equipped with
when data indicating that a softer shaft is desired is input as the desired data, the adjustment unit derives the adjusted stiffness index by reducing all of the plurality of stiffness values included in the optimal stiffness index, or by reducing only the stiffness values at one or a plurality of positions on the grip side of the shaft among the plurality of stiffness values included in the optimal stiffness index,
the screen creation unit creates a screen displaying at least one of the adjustment stiffness index and a recommended shaft that matches the adjustment stiffness index.
Fitting device. An analysis unit that derives an optimal stiffness index, which is a stiffness index including stiffness values at multiple positions of a shaft included in a golf club based on measurement data obtained by measuring a golf swing by a golfer using a measuring device, and which is the stiffness index suitable for the golfer;
a screen creation unit that creates a screen displaying at least one of the optimal stiffness index and candidate shafts that match the optimal stiffness index;
an adjustment unit that receives an input of request data indicating the request of the golfer based on a test hit result of a golf club including the candidate shaft, and derives an adjusted stiffness index by adjusting the optimal stiffness index in accordance with the request data;
Equipped with
when data indicating that a ball directionality to be directed to the left is desired is input as the desired data, the adjustment unit derives the adjusted stiffness index by reducing only the stiffness values at one or a plurality of positions on a tip side of the shaft, among the plurality of stiffness values included in the optimal stiffness index ;
the screen creation unit creates a screen displaying at least one of the adjustment stiffness index and a recommended shaft that matches the adjustment stiffness index.
Fitting device. An analysis unit that derives an optimal stiffness index, which is a stiffness index including stiffness values at multiple positions of a shaft included in a golf club based on measurement data obtained by measuring a golf swing by a golfer using a measuring device, and which is the stiffness index suitable for the golfer;
a screen creation unit that creates a screen displaying at least one of the optimal stiffness index and candidate shafts that match the optimal stiffness index;
an adjustment unit that receives an input of request data indicating the request of the golfer based on a test hit result of a golf club including the candidate shaft, and derives an adjusted stiffness index by adjusting the optimal stiffness index in accordance with the request data;
Equipped with
when data indicating that a ball directionality to be turned to the left is desired is input as the desired data, the adjustment unit reduces only the stiffness values at a plurality of positions on the tip side of the shaft among the plurality of stiffness values included in the optimal stiffness index, and at this time, derives the adjusted stiffness index by reducing the stiffness values at the plurality of positions by different levels;
the screen creation unit creates a screen displaying at least one of the adjustment stiffness index and a recommended shaft that matches the adjustment stiffness index.
Fitting device. An analysis unit that derives an optimal stiffness index, which is a stiffness index including stiffness values at multiple positions of a shaft included in a golf club based on measurement data obtained by measuring a golf swing by a golfer using a measuring device, and which is the stiffness index suitable for the golfer;
a screen creation unit that creates a screen displaying at least one of the optimal stiffness index and candidate shafts that match the optimal stiffness index;
an adjustment unit that receives an input of request data indicating the request of the golfer based on a test hit result of a golf club including the candidate shaft, and derives an adjusted stiffness index by adjusting the optimal stiffness index in accordance with the request data;
Equipped with
when data indicating that a ball directionality to be turned to the right is desired is input as the desired data, the adjustment unit derives the adjusted stiffness index by increasing only the stiffness values at one or a plurality of positions on a tip side of the shaft, among the plurality of stiffness values included in the optimal stiffness index ;
the screen creation unit creates a screen displaying at least one of the adjustment stiffness index and a recommended shaft that matches the adjustment stiffness index.
Fitting device. An analysis unit that derives an optimal stiffness index, which is a stiffness index including stiffness values at multiple positions of a shaft included in a golf club based on measurement data obtained by measuring a golf swing by a golfer using a measuring device, and which is the stiffness index suitable for the golfer;
a screen creation unit that creates a screen displaying at least one of the optimal stiffness index and candidate shafts that match the optimal stiffness index;
an adjustment unit that receives an input of request data indicating the request of the golfer based on a test hit result of a golf club including the candidate shaft, and derives an adjusted stiffness index by adjusting the optimal stiffness index in accordance with the request data;
Equipped with
when data indicating that a ball directionality to be turned to the right is desired is input as the desired data, the adjustment unit increases only the stiffness values at a plurality of positions on the tip side of the shaft among the plurality of stiffness values included in the optimal stiffness index, and at this time, derives the adjusted stiffness index by increasing the stiffness values at the plurality of positions by different levels;
the screen creation unit creates a screen displaying at least one of the adjustment stiffness index and a recommended shaft that matches the adjustment stiffness index.
Fitting device. The stiffness index includes stiffness values at at least three positions of the shaft.
A fitting device according to any one of claims 1 to 6 . Deriving an optimal stiffness index, which is a stiffness index including stiffness values at a plurality of positions of a shaft included in a golf club based on measurement data obtained by measuring a golf swing by a golfer using a measuring device, and which is the stiffness index suitable for the golfer;
creating a screen displaying at least one of the optimal stiffness index and candidate shafts that match the optimal stiffness index;
receiving input of request data indicating the request of the golfer based on a test hit result of a golf club including the candidate shaft, and deriving an adjusted stiffness index by adjusting the optimal stiffness index in accordance with the request data;
creating a screen displaying at least one of the adjustment stiffness index and a recommended shaft that matches the adjustment stiffness index ;
Deriving the adjustment stiffness index includes, when data indicating that a stiffer shaft is desired is input as the desired data, deriving the adjustment stiffness index by increasing all of the plurality of stiffness values included in the optimal stiffness index, or by increasing only the stiffness values at one or more positions on the grip side of the shaft among the plurality of stiffness values included in the optimal stiffness index.
Fitting program. Deriving an optimal stiffness index, which is a stiffness index including stiffness values at a plurality of positions of a shaft included in a golf club based on measurement data obtained by measuring a golf swing by a golfer using a measuring device, and which is the stiffness index suitable for the golfer;
creating a screen displaying at least one of the optimal stiffness index and candidate shafts that match the optimal stiffness index;
receiving input of request data indicating the request of the golfer based on a test hit result of a golf club including the candidate shaft, and deriving an adjusted stiffness index by adjusting the optimal stiffness index in accordance with the request data;
creating a screen displaying at least one of the adjustment stiffness index and a recommended shaft that matches the adjustment stiffness index;
Run the following on your computer:
A fitting program in which deriving the adjustment stiffness index includes, when data indicating that a softer shaft is desired is input as the desired data, deriving the adjustment stiffness index by reducing all of the multiple stiffness values included in the optimal stiffness index, or by reducing only the stiffness values at one or more positions on the grip side of the shaft among the multiple stiffness values included in the optimal stiffness index. Deriving an optimal stiffness index, which is a stiffness index including stiffness values at a plurality of positions of a shaft included in a golf club based on measurement data obtained by measuring a golf swing by a golfer using a measuring device, and which is the stiffness index suitable for the golfer;
creating a screen displaying at least one of the optimal stiffness index and candidate shafts that match the optimal stiffness index;
receiving input of request data indicating the request of the golfer based on a test hit result of a golf club including the candidate shaft, and deriving an adjusted stiffness index by adjusting the optimal stiffness index in accordance with the request data;
creating a screen displaying at least one of the adjustment stiffness index and a recommended shaft that matches the adjustment stiffness index;
Run the following on your computer:
A fitting program in which deriving the adjustment stiffness index includes, when data indicating that the ball direction is desired to be turned to the left is input as the desired data, deriving the adjustment stiffness index by reducing only the stiffness values at one or more positions on the tip side of the shaft, among the multiple stiffness values included in the optimal stiffness index. Deriving an optimal stiffness index, which is a stiffness index including stiffness values at a plurality of positions of a shaft included in a golf club based on measurement data obtained by measuring a golf swing by a golfer using a measuring device, and which is the stiffness index suitable for the golfer;
creating a screen displaying at least one of the optimal stiffness index and candidate shafts that match the optimal stiffness index;
receiving input of request data indicating the request of the golfer based on a test hit result of a golf club including the candidate shaft, and deriving an adjusted stiffness index by adjusting the optimal stiffness index in accordance with the request data;
creating a screen displaying at least one of the adjustment stiffness index and a recommended shaft that matches the adjustment stiffness index;
Run the following on your computer:
A fitting program in which deriving the adjustment stiffness index includes, when data indicating that the ball direction is desired to be turned to the left is input as the desired data, reducing only the stiffness values at multiple positions on the tip side of the shaft among the multiple stiffness values included in the optimal stiffness index, and at this time, deriving the adjustment stiffness index by reducing the stiffness values at the multiple positions by different levels. Deriving an optimal stiffness index, which is a stiffness index including stiffness values at a plurality of positions of a shaft included in a golf club based on measurement data obtained by measuring a golf swing by a golfer using a measuring device, and which is the stiffness index suitable for the golfer;
creating a screen displaying at least one of the optimal stiffness index and candidate shafts that match the optimal stiffness index;
receiving input of request data indicating the request of the golfer based on a test hit result of a golf club including the candidate shaft, and deriving an adjusted stiffness index by adjusting the optimal stiffness index in accordance with the request data;
creating a screen displaying at least one of the adjustment stiffness index and a recommended shaft that matches the adjustment stiffness index;
Run the following on your computer:
A fitting program in which deriving the adjustment stiffness index includes, when data indicating that the ball direction is desired to be turned to the right is input as the desired data, deriving the adjustment stiffness index by increasing only the stiffness values at one or more positions on the tip side of the shaft, among the multiple stiffness values included in the optimal stiffness index. Deriving an optimal stiffness index, which is a stiffness index including stiffness values at a plurality of positions of a shaft included in a golf club based on measurement data obtained by measuring a golf swing by a golfer using a measuring device, and which is the stiffness index suitable for the golfer;
creating a screen displaying at least one of the optimal stiffness index and candidate shafts that match the optimal stiffness index;
receiving input of request data indicating the request of the golfer based on a test hit result of a golf club including the candidate shaft, and deriving an adjusted stiffness index by adjusting the optimal stiffness index in accordance with the request data;
creating a screen displaying at least one of the adjustment stiffness index and a recommended shaft that matches the adjustment stiffness index;
Run the following on your computer:
A fitting program in which deriving the adjustment stiffness index includes, when data indicating that the ball direction is desired to be turned to the right is input as the desired data, increasing only the stiffness values at multiple positions on the tip side of the shaft among the multiple stiffness values included in the optimal stiffness index, and at this time, deriving the adjustment stiffness index by increasing the stiffness values at the multiple positions by different levels.