Golf club shaft fitting device

Abstract

To provide a fitting device or the like of a golf club shaft capable of proposing a shaft convenient for improvement of an error shot and / or further improvement of a nice shot.SOLUTION: A fitting device 200 for selecting a shaft of a golf club suited to a golfer includes: an acquisition part 201 which acquires a first measured value from a swing sensor 100 and a second measured value about a trajectory of a golf ball measured by a trajectory measuring device 400; a calculation part 202 which calculates a feature amount of each of a plurality of swings on the basis of the first measured value; a superiority discrimination part 203 which discriminates superiority of the plurality of swings on the basis of the second measured value; a weighting part 204 which sets a weighting for a plurality of swings on the basis of the swing superiority; and a determination part 205 which determines a first shaft index for identifying specifications of a shaft to be recommended to the golfer on the basis of the swing feature amount and the weight.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a golf club shaft fitting device and the like. [Background technology]

[0002] The following Patent Documents 1 and 2 propose a shaft fitting method and device for selecting a shaft that matches a golfer based on the golfer's swing. This fitting method includes a step of obtaining measurement values ​​from a sensor attached to a grip by a golf club by receiving means of a computer, and a step of selecting a shaft that matches the golfer by using swing feature quantities obtained from the measurement values ​​by an arithmetic processing means of the computer.

[0003] Furthermore, in Patent Documents 1 and 2, a golfer who requests fitting is asked to test hit a predetermined number of balls (for example, five balls), and the average of the swing feature amounts calculated at each hit is set as the swing feature amount of the golfer. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6087132 [Patent Document 2] Patent No. 6911298 Summary of the Invention [Problem to be solved by the invention]

[0005] Golfers cannot always make the same swing. In particular, during a round, they often make mishits. Therefore, it is important to provide as an option a shaft that is suitable for a swing when making a mishit, that is, a shaft that can provide a shot with a long distance and little deviation to the left or right, even when making a swing that previously led to a mishit.

[0006] However, in the above fitting method, the golfer's swing is determined by averaged swing feature values. Therefore, if the number of good shots is greater than the number of mis-shots during swing measurement, the swing feature values ​​for the mis-shots will be weakened, and it will not be possible to propose a shaft that is specifically designed to improve mis-shots.

[0007] Conversely, there are cases where a golfer seeks a shaft that will further improve their good shots. In such cases, if the number of mishits is greater than the number of good shots, the above fitting method weakens the swing feature values ​​of good shots, and as a result, it is not possible to propose a shaft specialized for further improving good shots.

[0008] The present disclosure has been devised in consideration of the above-described circumstances, and its main purpose is to provide a golf club shaft fitting device, etc., that is capable of suggesting shafts that will help improve mis-shots and / or further improve good shots. [Means for solving the problem]

[0009] The present disclosure relates to a fitting device for selecting a golf club shaft suitable for a golfer, the fitting device including: an acquisition unit that acquires first measurement values ​​from a swing sensor that is acquired by making a plurality of swings to hit a golf ball using a golf club with a swing sensor attached in an environment where a trajectory measurement device is installed, and second measurement values ​​related to the trajectory of the golf ball measured by the trajectory measurement device; a calculation unit that calculates swing feature values ​​for each of the plurality of swings based on the first measurement values; a superiority / inferiority discrimination unit that discriminates superiority / inferiority of the plurality of swings based on the second measurement values; a weighting unit that sets weights for the plurality of swings based on the superiority / inferiority of the swings; and a determination unit that determines a first shaft index that specifies the specifications of a shaft to be recommended to the golfer based on the swing feature values ​​and the weights. [Effects of the Invention]

[0010] The golf club shaft fitting device of the present disclosure has the above-mentioned configuration, and its main purpose is to provide a golf club shaft fitting device etc. that can suggest shafts that will help improve mis-shots and / or further improve good shots. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is an overall configuration diagram showing a golf club shaft fitting system according to an embodiment of the present invention; [Figure 2] FIG. 1 is a block diagram of a fitting system according to an embodiment of the present invention. [Figure 3] 10A and 10B are diagrams illustrating the bending behavior of a shaft during a swing. [Figure 4] 10 is a graph showing the relationship between the passage of time during a swing and the angular velocity in the cocking direction. [Figure 5] 10 is a graph showing the relationship between the first to fourth feature amounts and the EI values ​​suitable for each of them. [Figure 6] FIG. [Figure 7] This is a conversion table of EI value to IFC. [Figure 8] 10 is an example of a fitting result displayed on a display unit. [Figure 9] This is the result of a golfer's shot. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings. The specific configurations shown in the embodiments and drawings are for the purpose of understanding the contents of the present disclosure, and the present disclosure is not limited to the specific configurations shown. Furthermore, in multiple embodiments, the same or common elements are designated by the same reference numerals throughout the specification, and redundant explanations will be omitted.

[0013] FIG. 1 shows an overall configuration diagram of a golf club shaft fitting system 1 according to this embodiment. FIG. 2 shows a block configuration diagram of the fitting system 1 according to this embodiment. The fitting system 1 and fitting method according to this embodiment measure the swing of a golfer 3 who wishes to be fitted and can select specifications for a shaft 22 of a golf club 2 that are suitable for this swing. Therefore, the fitting system 1 according to the present disclosure proposes a shaft 22 that corresponds to the swing of the golfer 3, and ultimately improves the distance and directionality of the golfer's 3 hits. In particular, the fitting system 1 according to this embodiment is configured with the primary purpose of recommending a shaft that will improve the golfer's 3 mishits.

[0014] As shown in FIGS. 1 and 2, a fitting system 1 of this embodiment includes, for example, a swing sensor 100 that can be attached to a golf club 2, a fitting device 200, a display unit 300, and a trajectory measurement device 400.

[0015] [Golf Clubs] The golf club 2 has, for example, a grip 21, a shaft 22, and a head 23. In this embodiment, a wood-type golf club is shown as the golf club 2. In other embodiments, the golf club 2 may be an iron-type or a putter-type club.

[0016] [Swing sensor] 1, for example, the swing sensor 100 is configured to be attachable to a golf club 2. The swing sensor 100 of this embodiment is detachable from the grip 21 or the shaft 22 of the golf club 2. It is desirable that the swing sensor 100 be configured to be small and lightweight so as not to interfere with the swing motion of the golfer 3.

[0017] The swing sensor 100 of this embodiment can measure a first measurement value, which is a predetermined physical quantity, from the golf club 2 during a swing. As shown in FIG. 2, the swing sensor 100 of this embodiment includes an angular velocity measurement unit 101, and illustrates a case where the first measurement value is the angular velocity of the golf club 2 during a swing. In a preferred embodiment, the swing sensor 100 can measure angular velocity around at least one axis of a three-dimensional local coordinate system associated with the golf club 2. In another embodiment, as described in Patent Document 2, the physical quantity may be the acceleration of the golf club 2 and / or geomagnetism.

[0018] 1, the local coordinate system may have, for example, a z-axis that corresponds to the axial direction of the shaft 22 of the golf club 2, an x-axis that corresponds to the toe-heel direction of the head 23, and a y-axis that corresponds to the direction of the target ball flight at address of the golf club 2. The swing sensor 100 of this embodiment can measure the angular velocity around each of the above three axes during a swing at a predetermined sampling period (for example, 1 millisecond).

[0019] Therefore, when the golfer 3 swings the golf club 2 equipped with the swing sensor 100 to hit the golf ball 4 multiple times, the first measurement value can be measured by the swing sensor 100. The number of swings is not particularly limited as long as it is two or more, but may be preferably three or more, and more preferably five or more.

[0020] As shown in FIG. 2, swing sensor 100 of this embodiment further includes a communication unit 102 for providing the measured first measurement value to fitting device 200. Communication unit 102 is preferably wireless so as not to interfere with the swing motion. In another aspect, communication unit 102 may be wired. Furthermore, swing sensor 100 may include a removable storage medium (not shown) instead of or in addition to communication unit 102. In this case, the first measurement value may be temporarily stored in the storage medium and then imported into fitting device 200 via this storage medium.

[0021] [Ballistic measurement device] The trajectory measurement device 400 can measure second measurement values ​​that are information related to the trajectories of each golf ball 4 hit by multiple swings. The "information related to the trajectory" of the golf ball 4 is data that specifies the motion state of the golf ball 4 hit with a golf club, and includes, for example, first trajectory information and / or second trajectory information.

[0022] The first trajectory information includes information corresponding to or the flight distance of the hit golf ball 4. The flight distance of the golf ball 4 may be a value approximately calculated from information on the flight distance itself as well as various information on the hit golf ball 4 (for example, information on the launch angle, ball speed, amount of backspin, etc.).

[0023] The second trajectory information includes the lateral deviation of the hit golf ball 4 from a predetermined target flight line or information corresponding thereto. The lateral deviation of the golf ball 4 may be information on the deviation amount itself or may be a value approximately calculated from various information on the hit golf ball 4 (information on launch angle, ball speed, amount of backspin, amount of sidespin, etc.).

[0024] As shown in FIGS. 1 and 2, the trajectory measurement device 400 is installed, for example, on the opposite side of the target ball flight line from the golfer 3. The trajectory measurement device 400 includes a measurement unit 401 including, for example, a camera and a control device (not shown). The measurement unit 401 can measure a second measurement value by capturing images of the head 23 and the hit golf ball 4 and analyzing the captured image data. The trajectory measurement device 400 can also measure the head speed (hereinafter, sometimes referred to as "HS"), which is the speed at which the head 23 of the golf club 2 strikes the golf ball 4 during a swing. Various commercially available trajectory measurement devices can be used as this trajectory measurement device 400, and a small, portable device such as "SkyTrak" (a registered trademark of SkyTrak, LLC) is suitable.

[0025] As shown in FIG. 2, the trajectory measurement device 400 of this embodiment further includes a communication unit 402 for providing the second measurement value to the fitting device 200. The communication unit 402 of this embodiment is wireless, but it may also be wired using a cable. The trajectory measurement device 400 may also include a removable storage medium (not shown) in place of or in addition to the communication unit 402. In this case, the second measurement value may be imported into the fitting device 200 via the storage medium.

[0026] [Fitting device] The fitting device 200 of this embodiment acquires first and second measurement values ​​from the swing sensor 100 and trajectory measurement device 400, respectively, and executes predetermined processing. The fitting device 200 is, for example, a computer, and can be realized as, among other things, various general-purpose personal computers, tablet computers, smartphones, or even dedicated terminals.

[0027] As shown in FIG. 2, the fitting device 200 includes an acquisition unit 201 that acquires first and second measurement values ​​from the swing sensor 100 and the trajectory measurement device 400, respectively; a calculation unit 202 that calculates swing feature values ​​based on the first measurement values; a superiority / inferiority discrimination unit 203 that discriminates the superiority or inferiority of multiple swings based on the second measurement values; a weighting unit 204 that assigns weights to the multiple swings based on the superiority or inferiority of the swings; and a determination unit 205 that determines a first shaft index that specifies the specifications of the shaft to be recommended to the golfer based on the swing feature values ​​and weights.

[0028] The fitting device 200 of this embodiment also includes a storage unit 206 (described later), an input unit 207, and a control unit 208. The storage unit 206 includes, for example, a non-volatile first storage unit 206A (described in detail later) in which a fitting program and various master data (described later) are stored, and a volatile second storage unit 206B that serves as a working memory. The input unit 207 is composed of, for example, a keyboard, a mouse, a virtual keyboard of a tablet, etc. The control unit 208 operates the above-mentioned units in accordance with the program, and is composed of, for example, a central processor (CPU).

[0029] [Acquisition Department] Acquisition unit 201 is configured to be able to wirelessly communicate with communication unit 102 of swing sensor 100 and communication unit 402 of trajectory measurement device 400. Therefore, acquisition unit 201 can execute the step of acquiring the first measurement value and the second measurement value measured by swing sensor 100 and trajectory measurement device 400 via communication units 102 and 402, respectively. Acquisition unit 201 stores the acquired first measurement value and second measurement value in memory unit 206.

[0030] [Calculation section] The calculation unit 202 can execute a step of calculating a swing feature amount for each of a plurality of swings based on the first measurement value acquired by the acquisition unit 201. The swing feature amount is a feature amount that quantitatively characterizes the swing motion of the golfer 3. There are no particular limitations on the swing feature amount as long as it is such a feature amount. In this embodiment, the swing feature amount already described in detail in Patent Documents 1 and 2 is adopted. Below, a brief explanation of this swing feature amount will be given.

[0031] Generally, a golfer's swing progresses through address, top, and impact. During this time, bending occurs in the shaft 22 of the golf club 2 due to the inertia of the head 23. This bending is transmitted from the grip side of the shaft 22 to the tip side during the swing process, from the top to the impact. Figure 3 shows the hands of the golfer 3 and a portion of the shaft 22 during the swing process, from the take-back (top) to the impact. In Figure 3, the portion of the shaft 22 that is most bent is surrounded by an imaginary line.

[0032] In Figure 3, at point 1 when the top of the swing is reached, bending occurs near the grip of the shaft 22. Next, from the transition point to point 2 at the beginning of the downswing, the bending moves slightly toward the tip of the shaft 22. Furthermore, at point 3 when the arms of the golfer 3 become horizontal, the bending moves toward the tip of the shaft 22 rather than the center. Furthermore, at point 4 just before impact, the bending moves to the vicinity of the tip of the shaft 22.

[0033] Considering the change in the bending position of the shaft 22 during the swing as described above, in this embodiment, attention is focused on the angular velocity ωy in the cocking direction during the downswing from near the top to impact as a swing feature. Specifically, attention is focused on the angular velocity ωy at several points in time as the swing progresses. Here, "near the top" of the swing refers to a time period that includes a predetermined time just before the top and a predetermined time just after the top, and specifically refers to a 100 ms time period from -50 ms after the top to +50 ms after the top, for example.

[0034] 4 shows the relationship between the time (s) from address to impact for a certain swing and the angular velocity ωy (deg / s) in the cocking direction of the golf club 2 during the swing. In this embodiment, as shown in FIG. 4, the following four first to fourth feature amounts F1 to F4 are included as swing feature amounts per swing.

[0035] The first feature value F1 is the gradient of the angular velocity ωy in the cocking direction near the top. The first feature value F1 can be calculated, for example, by adding the angular velocity ωy 50 ms before the top and the angular velocity ωy 50 ms after the top. Note that the direction of the angular velocity of the golf club 2 during the swing changes at the top. Therefore, when calculating the sum, a minus sign is added in advance to the angular velocity before the top.

[0036] The second feature value F2 is the average value of the angular velocity ωy from the top to the point where the angular velocity ωy reaches its maximum. The second feature value F2 can be calculated by finding the maximum value of the angular velocity ωy from the top to impact, and dividing the cumulative value of the angular velocity ωy from the top to the point where this maximum value is reached by the time from the top to the point where the maximum value is reached.

[0037] The third feature value F3 is the average value of the angular velocity ωy from the time when the angular velocity ωy reaches its maximum until the impact, and can be calculated by dividing the cumulative value of the angular velocity ωy from the time when the angular velocity ωy reaches its maximum until the impact by the time from the time when the angular velocity ωy reaches its maximum until the impact.

[0038] The fourth feature value F4 is the average value of the angular velocity ωy from the top to the impact, and can be 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.

[0039] In this embodiment, since a swing is performed multiple times, a swing feature amount for each swing, i.e., multiple swing feature amounts, are stored in storage unit 206. As described above, each swing feature amount includes first to fourth feature amounts F1 to F4, respectively.

[0040] [Superiority Discrimination Department] The superiority / inferiority determining section 203 of this embodiment can execute a step of determining the superiority / inferiority of a plurality of swings based on the second measurement value.

[0041] The superiority / inferiority determining unit 203 can determine the superiority / inferiority of a swing based on, for example, the first trajectory information (i.e., information related to the flight distance of the hit golf ball 4). More specifically, the superiority / inferiority determining unit 203 can sort the swings by, for example, the flight distance of the hit golf ball 4, and determine that the swing with the greater flight distance is the better swing. According to this standard, the superiority / inferiority determining unit 203 can determine, for example, the best swing as the first swing and the worst swing as the second swing.

[0042] In another aspect, the superiority / inferiority determining unit 203 can determine the superiority of a swing based on, for example, second trajectory information (i.e., information regarding the left / right deviation of the hit golf ball 4 from a predetermined target flight line). More specifically, the superiority / inferiority determining unit 203 can sort the swings by the magnitude of the left / right deviation of the hit golf ball 4, and determine that a swing with a smaller deviation is a better swing. Based on this criterion, the superiority / inferiority determining unit 203 can determine the best swing as the first swing and the worst swing as the second swing.

[0043] In yet another aspect, superiority determination unit 203 may determine the superiority of a swing using both the first trajectory information and the second trajectory information. In this case, for example, an evaluation value may be calculated by multiplying the first trajectory information and / or the second trajectory information by a coefficient or the like and adding the results together, and the superiority of a swing may be determined based on this evaluation value.

[0044] [Weighting section] The weighting unit 204 can execute a step of setting weights to the multiple swings based on the superiority or inferiority of the swings determined by the superiority or inferiority determination unit 203. The weight is a coefficient set according to the purpose of fitting. The weight highlights a specific swing so that the fitting results more closely match the purpose of the fitting system 1. In this embodiment, a weight is set for each of the multiple swings. For example, the larger the weight value, the more the swing will stand out.

[0045] The main purpose of the fitting system 1 of this embodiment is to recommend a shaft that will improve mishits. To this end, the weighting unit 204 of this embodiment sets the weight w2 of the second swing, which is determined to be the poorest of the multiple swings, to be greater than the weight w1 of the first swing, which is determined to be the best (w2>w1). This allows the weighting unit 204 to make the second swing stand out more than the first swing.

[0046] The specific values ​​of the weights w1 and w2 (hereinafter, these may be collectively referred to as weights wi) set for each swing are not particularly limited and may be adjusted appropriately depending on the purpose. In this embodiment, the largest weight w2 is set to 2.0, and the smallest weight w1 is set to 0.5.

[0047] [Decision section] The determination unit 205 can execute a step of determining a first shaft index that specifies the specifications of the shaft 22 that should be recommended to the golfer, based on a plurality of swing feature amounts and the weight wi.

[0048] The determination unit 205 of this embodiment includes a first determination unit 205A that executes a step of determining a plurality of shaft indices for identifying a shaft suitable for each of a plurality of swing feature quantities, and a second determination unit 205B that executes a step of determining a first shaft index by taking a weighted average of the plurality of shaft indices taking the weights into consideration.

[0049] [First Decision Section] In this embodiment, one shaft indicator is made up of bending stiffness values ​​(hereinafter sometimes referred to as "EI values") at four positions (described later) in the axial direction of the shaft 22. Therefore, one shaft indicator is a set of four EI values. Identifying the four EI values ​​helps to specifically identify the specifications of the shaft 22. Furthermore, multiple shaft indicators means that there are multiple shaft indicators, each of which is a set of four EI values, and therefore, it is possible to identify the specifications of multiple shafts 22.

[0050] Furthermore, a shaft suitable for a certain swing feature value means a shaft that increases the flight distance of the ball and reduces the deviation to the left or right when a swing corresponding to the swing feature value is made with a golf club 2 having a pre-specified head 23. The specific head 23 may be, for example, a head 23 that the golfer 3 has already used, or a head that the golfer 3 plans to use.

[0051] 5 shows the relational expressions between the first to fourth feature amounts F1 to F4 calculated by the calculation unit and the shaft indicators appropriate for them. These relational expressions are determined for each of a plurality of predetermined head speed zones (indicated by "HS" in FIG. 5). In this embodiment, the head speed zones are divided into three or four zones. These relational expressions are stored in advance in the first storage unit 206A.

[0052] As disclosed in Patent Documents 1 and 2, through the analysis of the results of a large number of hitting tests, it is possible to roughly identify the relationship between the first to fourth feature amounts F1 to F4 of a golfer 3 and the distribution of EI values ​​at predetermined positions in the axial direction of the shaft 22 that are suitable for that swing. This point will be briefly explained below.

[0053] Fig. 6 is a plan view of the shaft 22. As shown in Fig. 6, when the shaft 22 is virtually divided into four regions a to d, the axial distribution of the EI values ​​of the shaft 22 can be identified as representative EI values ​​for each of the regions a to d. Specifically, the EI values ​​of the regions a to d are measured at positions P1 to P4, which are 36 inches, 26 inches, 16 inches, and 6 inches axially from the tip end 22a of the shaft 22, respectively. It has been found that the EI values ​​at these positions P1 to P4 are correlated with the first to fourth feature amounts F1 to F4, respectively.

[0054] Therefore, in this embodiment, by performing regression (simple regression) on the results of the impact test, assuming a specific head 23, relational expressions (approximate expressions) showing the relationship between each of the first to fourth feature amounts F1 to F4 and the EI values ​​at each axial position P1 to P4 of the shaft 22 appropriate for each head speed range are calculated in advance as shown in FIG. 5, and these are stored in the first storage unit 206A. Note that the axial positions P1 to P4 of the shaft 22, which are the measurement points, are not limited to the above-mentioned embodiment and may be changed within approximately ±2 inches from the above-mentioned positions. The EI value at each position is measured by the method described in Patent Document 1.

[0055] As is clear from FIG. 5, each of the relational expressions indicates that as the first to fourth feature amounts F1 to F4 increase, the EI value at each of the positions P1 to P4 on the shaft 22 increases proportionally (the shaft 22 becomes stiffer). Furthermore, each of the relational expressions indicates that as the head speed increases, the EI value at each of the positions P1 to P4 on the shaft 22 that is appropriate for that increase increases (the shaft 22 becomes stiffer). While each of the relational expressions in this embodiment employs a linear expression, the present invention is not limited to this. Furthermore, the divisions of the head speed bands in each of the relational expressions in FIG. 5 are merely examples, and the number of divisions and the specific ranges of head speed may be changed as appropriate.

[0056] As described above, the first determination unit 205A can determine shaft indexes suitable for each of a plurality of swings based on the first to fourth feature amounts F1 to F4, the average head speed of the golfer, and the above relational expressions. More specifically, in this embodiment, one shaft index is determined for each swing, and one shaft index includes four EI values ​​at positions P1 to P4 in the axial direction.

[0057] [Second Decision Section] The second determination unit 205B determines a first shaft index to be recommended to the golfer by taking a weighted average of the multiple shaft indexes determined by the first determination unit 205A, taking into consideration the weight wi described above. The first shaft index in this embodiment also consists of a set of EI values ​​at four positions P1 to P4 in the axial direction of the shaft 22.

[0058] Specifically, the EI value (EI (P1) ) can be determined by a weighted average as follows: EI (P1) =(w1 EI1 (P1) +w2 EI2 (P1) ) / (w1+w2) where w1 and w2 are the weights of the first swing and the second swing, respectively, and EI1 (P1) and EI2 (P1)are the EI values ​​determined from the first feature amount F1 for the first swing and the second swing, respectively.

[0059] Similarly, the EI value (EI (P2) ) can also be determined by a weighted average such as EI (P2) =(w1 EI1 (P2) +w2 EI2 (P2 )) / (w1+w2) Here, EI1 (P2) and EI2 (P2) are the EI values ​​determined from the second feature amount F2 for the first swing and the second swing, respectively.

[0060] In addition, the EI values ​​at the first shaft index positions P3 and P4 (EI (P3) ) and (EI (P4) ) can also be determined by weighted averaging in the same way as above. This gives the four EI values, EI (P1) , E.I. (P2) , E.I. (P3) and EI (P4) A first shaft index consisting of a set of

[0061] The first shaft indicator of this embodiment is useful for identifying a shaft 22 that is more suitable for the second swing, because the weight w2 of the shaft indicator for the second swing determined to be a mis-shot is set to be greater than the weight w1 of the shaft indicator for the first swing. Such a shaft 22 is useful for providing a hit ball with a longer flight distance and less deviation to the left or right, even when making the second swing.

[0062] In a more preferred embodiment, the second determination unit 205B of this embodiment further determines "IFC" based on the first shaft index. IFC stands for International Flex Cord, and is an index that more generally or universally defines the range of EI values ​​at each of positions P1 to P4 in the axial direction of the shaft 22.

[0063] The EI value at each of the first shaft index positions P1 to P4 is converted into an IFC value (an integer from 0 to 9) using an EI value-IFC conversion table such as that shown in Figure 7. As is clear from Figure 7, the larger the IFC value, the stiffer the shaft. Furthermore, the IFC is a four-digit number (e.g., "5655") obtained by arranging the four IFC values ​​of each of regions a to d of shaft 22 in order, and it is possible to identify shafts 22 having a certain bending rigidity distribution.

[0064] [Display] The display unit 300 is, for example, a display. The control unit 208 can execute a step of displaying the determined first shaft index or an index corresponding thereto (e.g., IFC) on the display unit 300. FIG. 8 shows an example of a display of fitting results by the display unit 300. As shown in FIG. 8, the display unit 300 of this embodiment visually displays the IFC of the recommended shaft 22. The display unit 300 of this embodiment displays the IFC "5655" as the recommended shaft. In another aspect, the display unit 300 may display the first shaft index, i.e., the EI values ​​at four positions P1 to P4 in the shaft axial direction, instead of the IFC.

[0065] Furthermore, in this embodiment, the control unit 208 can display the "cocking movement" during a swing on the display unit 300. This "cocking movement" corresponds to the magnitudes of the first to fourth feature amounts F1 to F4 in the swing feature amount.

[0066] Furthermore, in this embodiment, the control unit 208 can display a list (compatible shaft list) of one or more shafts that satisfy the recommended IFC on the display unit 300. Displaying such a compatible shaft list can be easily achieved by previously storing a database in the first storage unit 206A that associates the IFC with the product numbers, etc., of the shafts that are compatible with it.

[0067] As described above, the fitting system 1, fitting device 200, and fitting method of this embodiment can propose a shaft 22 that is useful for improving mishits by the golfer 3.

[0068] [Modification of the first embodiment] The fitting system 1 may be configured to recommend a shaft specialized for further improving a nice shot, for example. In such an embodiment, the weighting unit 204 sets a weight w1 of a first swing determined to be the best among a plurality of swings to be greater than a weight w2 of a second swing determined to be the worst (w1>w2), and determines the first shaft index using these weights.

[0069] The first shaft indicator of this embodiment is useful for identifying a shaft more suitable for the first swing because the weight w1 of the shaft indicator for the first swing, which is likely to be determined as a good shot, is set to be greater than the weight w2 of the shaft indicator for the second swing. Such a shaft 22 is useful for providing a shot that has a longer flight distance and less deviation to the left or right when making the first swing.

[0070] [Second embodiment] In the second embodiment, the function of the determination unit 205 is different from that of the first embodiment, but other parts are the same as those of the first embodiment. The determination unit 205 of the second embodiment is made up of a first determination unit 205A and a second determination unit 205B. This can be easily realized by changing the fitting program.

[0071] The first determination unit 205A of the second embodiment determines a first swing feature amount by taking a weighted average of multiple swing feature amounts calculated for multiple swings in consideration of weights. Specifically, the first feature amount F1a of the first swing feature amount can be determined by the following weighted average. F1a=(w1·F11+w2·F12) / (w1+w2) Here, w1 and w2 are the weights of the first swing and the second swing, respectively, and F11 and FI2 are the first feature amounts of the first swing and the second swing, respectively.

[0072] Similarly, the second feature amount F2a of the first swing feature amount can be determined by the following weighted average. F2a=(w1·F21+w2·F22) / (w1+w2) Here, F21 and F22 are the second feature amounts of the first swing and the second swing, respectively.

[0073] Similarly, the third feature amount F3a and the fourth feature amount F4a of the first swing feature amount can be determined by the weighted average, thereby determining the first swing feature amount consisting of the set of the first to fourth feature amounts F1a, F2a, F3a, and F4a.

[0074] Furthermore, the second determination unit 205B of the second embodiment determines the first shaft index based on the first swing feature amount. That is, in the first embodiment, multiple shaft indexes were determined from multiple swing feature amounts, and then a weighted average was calculated. On the other hand, in the second embodiment, multiple swing feature amounts are first weighted averaged to calculate one first swing feature amount, and the first shaft index is determined based on this first swing feature amount. The fitting system 1, fitting device 200, and fitting method of this embodiment can also suggest a shaft suitable for a swing for which a large weight is set.

[0075] [Modifications of the first and second embodiments] In the above embodiment, an index related to the bending stiffness value of the shaft 22 is used as the shaft index to select a shaft 22 suitable for the golfer 3. However, the present disclosure allows various indexes already known at the time of filing of this application to be used as the shaft index instead of or in addition to the index related to bending stiffness. Such indexes may be, for example, the weight or moment of inertia of the shaft 22 (and / or the golf club 2). Fitting of these shaft indexes may be performed according to known methods, such as those described in Patent Document 2 (the entire contents of Patent Documents 1 and 2 are incorporated herein by reference).

[0076] Although the embodiments of the present disclosure have been described in detail above, the present disclosure is not limited to the above specific disclosure, and can be implemented with various modifications within the scope of the technical idea described in the claims. [Example]

[0077] 9 shows the trajectories of a golfer swinging a golf club at a golf ball four times. The quality determination unit of the fitting system of the embodiment determined the first swing to be a good shot and the second swing to be a bad shot from the four swings, as shown in the figure.

[0078] The first swing has the longest distance and the smallest deviation from side to side, while the second swing has the shortest distance and the ball deviates to the right with the largest deviation.

[0079] <Comparative Example 1> In the fitting system of Comparative Example 1, the swing feature amounts of four swings were arithmetically averaged (without weighting), and the first shaft index was determined from the average value. The IFC at this time was "5655."

[0080] <Comparative Example 2> The fitting system of Comparative Example 2 determined the first shaft index based only on the swing feature values ​​of the second swing, which could be identified as a mishit. The IFC value at this time was "4644." Generally, when the EI value at the tip end of the shaft is small, it is easier to catch the golf ball and the ball tends to fly to the left. With the fitting device of Comparative Example 2, the IFC values ​​were one point smaller at three positions in the axial direction of the shaft, except for position P2, compared to Comparative Example 1. Therefore, Comparative Example 2 proposes a shaft that makes it difficult for the ball to fly to the right. On the other hand, the shaft recommended in Comparative Example 2 may cause the ball to fly excessively to the left.

[0081] <Example> In the example, the weight w1 of the first swing in the hitting results was set to 0.5, and the weight w1 of the second swing was set to 2.0. Then, a first shaft index was determined by performing a weighted average according to the aspect of claim 2. The IFC value at this time was "5645." The shaft recommended in the example had an IFC value one point lower only at the shaft axial position P3 compared to the shaft recommended in Comparative Example 1. Therefore, the specifications of the shaft recommended in the example make it easier to catch the ball when hitting it, suppressing deviation of the ball to the right, while reducing the possibility of the ball flying excessively to the left.

[0082] [Note] The present disclosure includes the following aspects.

[0083] [Disclosure 1] A fitting device for selecting a golf club shaft suitable for a golfer, an acquisition unit that acquires first measurement values ​​from a swing sensor that is acquired by making a swing to hit a golf ball multiple times using a golf club to which a swing sensor is attached in an environment where a trajectory measurement device is installed, and second measurement values ​​related to the trajectory of the golf ball that are measured by the trajectory measurement device; a calculation unit that calculates a swing feature amount for each of the plurality of swings based on the first measurement value; a superiority / inferiority determining unit that determines the superiority / inferiority of the plurality of swings based on the second measurement value; a weighting unit that sets weights for the plurality of swings based on the quality of the swings; a determination unit that determines a first shaft index that specifies a shaft specification to be recommended to the golfer based on the swing feature amount and the weight, Golf club shaft fitting device. [Disclosure 2] The determination unit includes a first determination unit that determines a plurality of shaft indices for identifying a shaft suitable for each of the plurality of swing feature amounts; and a second determination unit that determines the first shaft index by taking a weighted average of the multiple shaft indexes in consideration of the weights. [Disclosure 3] the determination unit determines a first swing feature amount by taking a weighted average of the plurality of swing feature amounts in consideration of the weights; and a second determination unit that determines the first shaft index based on the first swing feature amount. [Disclosure 4] the second measurement value includes first trajectory information relating to the distance traveled by the golf ball; The golf club shaft fitting device according to any one of Disclosures 1 to 3, wherein the superiority / inferiority determining unit determines the superiority / inferiority of the swing based on the first trajectory information. [Disclosure 5] the second measurement value includes second trajectory information relating to a lateral deviation of the golf ball from a predetermined target flight line; 5. The golf club shaft fitting device according to any one of Disclosures 1 to 4, wherein the quality determining unit determines the quality of the swing based on the second trajectory information. [Disclosure 6] the superiority / inferiority determining unit determines a best first swing and a worst second swing from the plurality of swings, 6. The golf club shaft fitting device according to any one of Disclosures 1 to 5, wherein the weighting section sets the weight of the second swing to be greater than the weight of the first swing. [Disclosure 7] the superiority / inferiority determining unit determines a best first swing and a worst second swing from the plurality of swings, 6. The golf club shaft fitting device according to any one of Disclosures 1 to 5, wherein the weighting section sets the weight of the first swing to be greater than the weight of the second swing. [Disclosure 8] 8. A golf club shaft fitting device according to any one of Disclosures 1 to 7, wherein the first shaft indicator includes an indicator relating to the bending stiffness of the shaft. [Disclosure 9] 9. A golf club shaft fitting device according to any one of Disclosures 1 to 8, wherein the first shaft indicator includes an indicator relating to the weight of the shaft. [Disclosure 10] A fitting system for selecting a golf club shaft suitable for a golfer, comprising the fitting device described in any one of claims 1 to 9 of the present disclosure, the swing sensor for measuring the first measurement value; the trajectory measurement device for measuring the second measurement; and a display unit that displays the first shaft indicator or an indicator corresponding thereto. Golf club shaft fitting system. [Disclosure 11] A fitting method for selecting a golf club shaft suitable for a golfer, comprising: A step of using a golf club equipped with a swing sensor to make a swing that hits a golf ball multiple times in an environment where a trajectory measurement device is installed, and acquiring a first measurement value from the swing sensor and a second measurement value related to the trajectory of the golf ball measured by the trajectory measurement device; calculating a swing feature amount for each of the plurality of swings based on the first measurement value; determining whether the plurality of swings are superior or inferior based on the second measurement values; setting weights for the plurality of swings based on the merits of the swings; determining a first shaft index that specifies specifications of a shaft to be recommended to the golfer based on the swing feature amount and the weight; How to fit a golf club shaft. [Disclosure 12] 12. A golf club shaft fitting method according to Disclosure 11, further comprising the step of displaying the first shaft indicator or an indicator corresponding thereto. [Disclosure 13] A fitting program for selecting a golf club shaft suitable for a golfer, comprising: A step of using a golf club equipped with a swing sensor to make a swing that hits a golf ball multiple times in an environment where a trajectory measurement device is installed, and acquiring a first measurement value from the swing sensor and a second measurement value related to the trajectory of the golf ball measured by the trajectory measurement device; calculating a swing feature amount for each of the plurality of swings based on the first measurement value; determining whether the plurality of swings are superior or inferior based on the second measurement values; setting weights for the plurality of swings based on the merits of the swings; determining a first shaft index that specifies specifications of a shaft to be recommended to the golfer based on the swing feature amount and the weight; to the computer, Golf club shaft fitting program. [Disclosure 14] 14. The golf club shaft fitting program of Disclosure 13, further comprising the step of displaying the first shaft indicator or an indicator corresponding thereto. [Explanation of symbols]

[0084] 1. Fitting System 2. Golf clubs 3. Golfer 4 golf balls 5 Swing 22 shaft 100 Swing Sensor 200 Fitting Device 201 Acquisition Department 202 Calculation Unit 203 Superiority / Inferiority Discrimination Department 204 Weighting section 205 Decision Section 205A 1st decision section 205B 2nd decision section F1~F4 First to fourth feature

Claims

1. A fitting device for selecting a golf club shaft suitable for a golfer, an acquisition unit that acquires first measurement values ​​from a swing sensor and second measurement values ​​related to the trajectory of the golf ball measured by the trajectory measurement device, the first measurement values ​​being acquired by making multiple swings to hit a golf ball using a golf club to which a swing sensor is attached in an environment where a trajectory measurement device is installed; a calculation unit that calculates a swing feature amount for each of the plurality of swings based on the first measurement value; a superiority / inferiority determining unit that determines superiority / inferiority of the plurality of swings based on the second measurement value; a weighting unit that sets weights for the plurality of swings based on the quality of the swings; a determination unit that determines a first shaft index that specifies a shaft specification to be recommended to the golfer based on the swing feature amount and the weight, Golf club shaft fitting device.

2. the determination unit includes a first determination unit that determines a plurality of shaft indices for identifying a shaft suitable for each of the plurality of swing feature amounts; 2. The golf club shaft fitting device according to claim 1, further comprising: a second determination unit that determines the first shaft index by taking a weighted average of the plurality of shaft indexes in consideration of the weights.

3. the determiner determines a first swing feature amount by taking a weighted average of the plurality of swing feature amounts in consideration of the weights; The golf club shaft fitting device according to claim 1 , further comprising: a second determination unit that determines the first shaft index based on the first swing feature amount.

4. the second measurement value includes first trajectory information relating to the distance traveled by the golf ball; The golf club shaft fitting device according to claim 1 , wherein the quality determining unit determines whether the swing is good or bad based on the first trajectory information.

5. the second measurement value includes second trajectory information relating to a lateral deviation of the golf ball from a predetermined target flight line; The golf club shaft fitting device according to claim 1 , wherein the quality determining unit determines whether the swing is good or bad based on the second trajectory information.

6. the superiority / inferiority determining unit determines a best first swing and a worst second swing from the plurality of swings, The golf club shaft fitting device according to claim 1 , wherein the weighting section sets the weight of the second swing to be greater than the weight of the first swing.

7. the superiority / inferiority determining unit determines a best first swing and a worst second swing from the plurality of swings, The golf club shaft fitting device according to claim 1 , wherein the weighting section sets the weight of the first swing to be greater than the weight of the second swing.

8. The golf club shaft fitting device according to claim 1 , wherein the first shaft indicator includes an indicator relating to the bending stiffness of the shaft.

9. The golf club shaft fitting device according to claim 1 , wherein the first shaft index includes an index relating to the weight of the shaft.

10. A fitting system for selecting a golf club shaft suitable for a golfer, comprising the fitting device according to any one of claims 1 to 9, the swing sensor for measuring the first measurement value; the trajectory measurement device for measuring the second measurement; a display unit that displays the first shaft indicator or an indicator corresponding thereto, Golf club shaft fitting system.

11. A fitting method for selecting a golf club shaft suitable for a golfer, comprising: In an environment where a trajectory measurement device is installed, a golf club having a swing sensor attached thereto is used to make a plurality of swings to strike a golf ball, and a first measurement value is obtained from the swing sensor, and a second measurement value relating to the trajectory of the golf ball is measured by the trajectory measurement device; calculating a swing feature amount for each of the plurality of swings based on the first measurement value; determining whether the plurality of swings are superior or inferior based on the second measurement values; setting weights for the plurality of swings based on the merits of the swings; determining a first shaft index that specifies specifications of a shaft to be recommended to the golfer based on the swing feature amount and the weight; How to fit a golf club shaft.

12. The method of claim 11 , further comprising the step of displaying the first shaft indicia or an indicia corresponding thereto.

13. A fitting program for selecting a golf club shaft suitable for a golfer, comprising: In an environment where a trajectory measurement device is installed, a golf club having a swing sensor attached thereto is used to make a plurality of swings to strike a golf ball, and a first measurement value is obtained from the swing sensor, and a second measurement value relating to the trajectory of the golf ball is measured by the trajectory measurement device; calculating a swing feature amount for each of the plurality of swings based on the first measurement value; determining whether the plurality of swings are superior or inferior based on the second measurement values; setting weights for the plurality of swings based on the merits of the swings; determining a first shaft index that specifies specifications of a shaft to be recommended to the golfer based on the swing feature amount and the weight; to the computer, Golf club shaft fitting program.

14. The golf club shaft fitting program of claim 13 , further comprising the step of displaying the first shaft index or an index corresponding thereto.

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