Golf club shaft fitting device

Abstract

To provide a fitting apparatus of a shaft of a golf club or the like which can propose a plurality of shafts corresponding to individual swings of golfers including missed shots.SOLUTION: A fitting apparatus 200 for selecting a shaft of a golf club suitable to a golfer comprises: an acquisition unit 201 which acquires a measurement value from a swing sensor 100 acquired by performing swings that hit golf balls plural times by a golf club attached with the swing sensor 100; a calculation unit 202 which calculates a swing feature amount for each swing on the basis of the acquired measurement value; a decision unit 203 which decides a shaft index for specifying the suitable shaft for each swing on the basis of the swing feature amount; and a ranking unit 204 which ranks the decided shaft indexes.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 for selecting a shaft that matches a golfer based on the golfer's swing. This fitting method includes the steps of: striking a golf ball with a golf club having a sensor attached to its grip that can measure angular velocity around three axes; acquiring measurement values from the sensor using a receiving means of a computer; determining the address, top, and impact of the swing from the measurement values using an arithmetic processing means of the computer; and selecting a shaft that matches the golfer using swing feature quantities obtained from the measurement values using the 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 (especially average golfers) do not always make the same swing. In particular, during a round, mishits often occur. Therefore, it is important to provide a selection of multiple shafts that are suited to each individual golfer's swing, including swings when making mishits.

[0006] However, in the above fitting method, the golfer's swing is determined by averaged swing features, so if the number of good shots is greater than the number of mis-shots, the movement of the mis-shots is weakened by the averaging process, and there is room for improvement in proposing a shaft that can improve mis-shots.

[0007] 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 proposing multiple shafts that correspond to each golfer's swing, including mishits. [Means for solving the problem]

[0008] The present disclosure relates to a fitting device for selecting a golf club shaft suitable for a golfer, the fitting device for golf club shafts including an acquisition unit that acquires measurement values from a swing sensor attached to a golf club by making a swing that strikes a golf ball multiple times, a calculation unit that calculates swing feature amounts for each swing based on the acquired measurement values, a determination unit that determines shaft indicators for identifying a shaft suitable for each swing based on the swing feature amounts, and a ranking unit that ranks the determined shaft indicators. [Effects of the Invention]

[0009] By adopting the above-described configuration, the golf club shaft fitting method of the present disclosure can propose multiple shafts that correspond to individual swings, including mishits, and provide golfers with a wide range of options. [Brief explanation of the drawings]

[0010] [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] FIG. [Figure 6] 10 is a graph showing the relationship between swing feature amounts and appropriate EI values. [Figure 7] This is a conversion table of EI value to IFC. [Figure 8] (A) is a graph showing the relationship between the flight distance of the ball and the amount of deviation in the left-right direction during five swings, and (B) is a graph showing the relationship between the flight distance of the ball and the height during the above five swings. [Figure 9] 10 is an example of a fitting result displayed on a display unit. [Figure 10] 10 is another example of a fitting result displayed on the display unit. DETAILED DESCRIPTION OF THE INVENTION

[0011] 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.

[0012] 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 multiple times, and are able to select multiple golf club shaft specifications suited to each swing. Therefore, the fitting system 1 according to the present disclosure can propose multiple shafts that correspond to each individual golfer's swing, providing a wide variety of options.

[0013] 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, and a display unit 300.

[0014] [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.

[0015] [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.

[0016] The swing sensor 100 of this embodiment can measure 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 measuring unit 101 and can measure the angular velocity of the golf club 2 during a swing. In a preferred embodiment, the swing sensor 100 can measure the 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 the geomagnetism.

[0017] 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).

[0018] Therefore, when a golfer wishing to be fitted swings the golf club 2 equipped with the swing sensor 100 to hit the golf ball 4 multiple times, the measurement values can be measured by the swing sensor 100. The number of swings is not particularly limited, but is preferably two or more, more preferably three or more, and even more preferably five or more.

[0019] As shown in FIG. 2, swing sensor 100 of this embodiment further includes a communication unit 102 for providing the measured values 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 measured values may be temporarily stored in the storage medium and then imported into fitting device 200 via this storage medium.

[0020] [Fitting device] The fitting device 200 of this embodiment acquires the measurement values of the swing sensor 100 and executes predetermined processing. The fitting device 200 can be realized, for example, as various general-purpose personal computers, tablet computers, smartphones, or even dedicated terminals.

[0021] As shown in FIG. 2, fitting device 200 includes an acquisition unit 201 that acquires measurement values from swing sensor 100, a calculation unit 202 that calculates swing feature amounts for each swing, a determination unit 203 that determines at least one swing index for identifying a golf club shaft that is appropriate for each swing, and a ranking unit 204 that ranks the swing indexes.

[0022] The fitting device 200 of this embodiment further includes an input unit 205, a storage unit 206, and a control unit 207. The input unit 205 is composed of, for example, a keyboard, a mouse, a virtual keyboard of a tablet, etc. The storage unit 206 includes a non-volatile storage unit such as a hard disk that stores the fitting program and various master data, etc., and a volatile storage unit that is a working memory. The control unit 207 operates each of the above units in accordance with the program, and is composed of, for example, a central processor (CPU).

[0023] [Acquisition Department] Acquisition unit 201 is configured to be able to communicate wirelessly with communication unit 102 of swing sensor 100. Therefore, measurement values measured by swing sensor 100 are acquired by acquisition unit 201 via communication unit 102. Acquisition unit 201 stores the acquired measurement values in storage unit 206 for each swing. In particular, in this embodiment, acquisition unit 201 acquires measurement values including those of swings that the golfer judges to be mis-shots (which refers to shots in which the ball is hit in a direction and / or distance different from the golfer's intended direction).

[0024] [Calculation section] The calculation unit 202 calculates swing feature amounts for each of a plurality of swings based on the measurement values acquired by the acquisition unit 201. The swing feature amount is a feature amount that quantitatively characterizes the swing motion of a golfer. 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 Document 1 is adopted. Below, a brief description of this swing feature amount is given.

[0025] 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 to the tip side during the swing process, from the top to 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 impact. In Figure 3, the portion of the shaft 22 where the bending is greatest is surrounded by an imaginary line.

[0026] 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.

[0027] 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.

[0028] 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 swing feature amounts F1 to F4 are defined as swing feature amounts.

[0029] The swing feature value F1 is the gradient of the angular velocity ωy in the cocking direction near the top of the swing. The swing feature value F1 can be calculated, for example, by adding the angular velocity ωy 50 ms before the top of the swing and the angular velocity ωy 50 ms after the top of the swing.

[0030] The swing feature quantity F2 is the average value of the angular velocity ωy from the top to the point at which the angular velocity ωy reaches its maximum. The swing feature quantity F2 can be calculated by determining 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 at which this maximum value is reached by the time from the top to the point at which the angular velocity ωy reaches its maximum value.

[0031] The swing feature value F3 is the average value of the angular velocity ωy from the point at which the angular velocity ωy reaches its maximum until impact. The swing feature value F3 can be calculated by dividing the cumulative value of the angular velocity ωy from the point at which the angular velocity ωy reaches its maximum until impact by the time from the point at which the angular velocity ωy reaches its maximum until impact.

[0032] The swing feature quantity 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.

[0033] The swing feature amounts F1 to F4 are calculated for each of a plurality of swings, and the values are stored in the storage unit 206.

[0034] [Decision section] The determining unit 203 determines a shaft index appropriate for each swing based on the swing feature values F1 to F4 calculated by the calculating unit 202. The shaft index is an index useful for specifically identifying the shaft 22. As already disclosed in Patent Document 1, if the swing feature values F1 to F4 of a golfer are known through analysis of the results of numerous hitting tests, it is possible to determine a shaft index appropriate for that swing. Here, a shaft (or shaft index) appropriate for a certain swing refers to a shaft (or shaft index) that, when swung with a golf club 2 having a pre-specified head 23, results in a longer ball flight distance and less lateral deviation. The specific head 23 may be, for example, a head 23 already used by the golfer 3, or a head that the golfer plans to use.

[0035] The determination unit 203 of this embodiment first determines an ideal bending stiffness value (hereinafter sometimes referred to as "EI value") for each position of the shaft 22 based on the swing feature amounts F1 to F4 (first determination step), and then determines "IFC," which is one of the shaft indicators, based on the EI value (second determination step). The first determination step and the second determination step will be described in detail below. However, as another aspect, the determination unit 203 may directly determine the shaft indicator "IFC" based on the swing feature amounts F1 to F4, or may use the EI value as the shaft indicator.

[0036] [First decision step] As described in Patent Document 1, by performing regression analysis or the like on the results of a large number of hitting tests, the relationship between a golfer's swing (swing feature values F1 to F4) and the distribution of EI values in the axial direction of the shaft 22 that is suitable for that swing can be identified in advance.

[0037] FIG. 5 is a plan view of the shaft 22. As shown in FIG. 5, the axial distribution of the EI values of the shaft 22 can be determined by virtually dividing the shaft 22 into four regions a to d and identifying the representative EI values for each region a to d. Specifically, the EI values of 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. The EI values at these positions P1 to P4 are correlated with the swing feature quantities F1 to F4, respectively. Note that the measurement points P1 to P4 are not limited to the above-described embodiment and may be varied by approximately ±2 inches from the above-described positions. Note that the bending rigidity at each position is measured using the method described in Patent Document 1.

[0038] FIG. 6 is a graph showing the relationship, obtained by regression analysis, between each swing feature amount F1-F4 and the EI value at each position P1-P4 in the axial direction of shaft 22 that is suited to each of them. Generally, as swing feature amounts F1-F4 increase, the EI value at each position P1-P4 that is suited to each of them also increases (the shaft becomes stiffer). The relationship in FIG. 6 is stored in advance as a relational expression in storage unit 206. Note that "HS" in FIG. 6 represents head speed, and this relationship is determined for each head speed. Note that the head speed of the golfer being fitted is assumed to have been measured in advance.

[0039] Therefore, the determination unit 203 can determine an appropriate EI value at each of positions P1 to P4 in the axial direction of the shaft 22 based on the swing feature amounts F1 to F4 calculated by the calculation unit 202. Note that the determination unit 203 of this embodiment does not perform averaging processing of the swing feature amounts of each swing. Therefore, it is possible to determine an appropriate EI value at each of positions P1 to P4 in the axial direction of the shaft 22 for each swing.

[0040] [Second decision step] The determination unit 203 of this embodiment determines "IFC" as a final shaft index based on the EI value determined in the first determination step. IFC stands for International Flex Cord, and is an index for specifying the range of EI values at each of positions P1 to P4 in the axial direction of the shaft 22.

[0041] The EI values at each position P1 to P4 of the shaft are converted into IFC values (integers from 0 to 9) using an EI value-IFC conversion table such as that shown in Fig. 7. The IFC can then be used to identify a shaft 22 having a certain bending stiffness distribution using a four-digit number (e.g., "5655") obtained by arranging the four IFC values for each of the regions a to d in order. Therefore, the determination unit 203 of this embodiment can determine various shaft indicators that are suited to each individual swing.

[0042] A specific example of the determination unit 203 of this embodiment will be shown below. The graphs in Figures 8(A) and (B) show the results when a right-handed golfer hits a golf ball 4 five times with a golf club 2 equipped with a swing sensor 100. In the graph in Figure 8(A), the vertical axis represents the left-right deviation of the hit ball from the target flight line, and the horizontal axis represents the flight distance of the hit ball. With respect to the left-right deviation, deviations to the right are displayed as negative values. In the graph in Figure 8(B), the vertical axis represents the height of the hit ball in the flight area, and the horizontal axis represents the flight distance of the hit ball. The flight distance, left-right deviation, and height of the hit ball obtained with each swing may be measured using, for example, a trajectory measurement device (not shown).

[0043] In swings 1 to 3, the ball tends to fly to the left (hook), but the deviation from left to right is relatively small (for example, less than 50 yards). On the other hand, in swings 4 and 5, the ball tends to fly to the right (slice), and the deviation from left to right is considerably larger (for example, more than 50 yards), compared to swings 1 to 3. Therefore, swings 4 to 5 may be recognized as mishits.

[0044] In the conventional fitting method of Patent Document 1, the swing feature amounts calculated from each of these swings 1 to 5 are averaged, and the shaft is fitted using this average value. This means that the features of swings 4 to 5 tend to be diluted. Furthermore, according to the conventional method, the shaft index IFC output as the fitting result is determined to be, for example, "5655." This is because the EI values (×9.8 N·m) at positions P1 to P4 of the shaft 22 are 2 ) means that the following shaft ranges are recommended: P1: 6.99~6.555 P2: 5.069~4.832 P3: 3.276~3.085 P4: 2.7~2.62

[0045] On the other hand, the determination unit 203 of this embodiment can determine a shaft index for identifying the appropriate shaft 22 for each of multiple swings, and as a result, multiple (two types in this example) shaft indexes are determined, for example, as follows: Suitable for Swing 1 IFC:5655 Suitable for Swing 2 IFC:5655 Suitable for Swing 3 IFC:5655 Suitable for Swing 4 IFC:6655 Suitable for Swing 5 IFC:6655

[0046] [Ranking section] The ranking unit 204 has a function of ranking the determined shaft indices (IFCs). The ranking unit 204 of this embodiment, for example, ranks a shaft indices that appear more frequently higher and ranks a shaft indices that appear less frequently lower. For example, in the above swings 1 to 5, the shaft indices IFC "5655" appear three times, and the IFC "6655" appears two times. Therefore, the ranking unit 204 of this embodiment sorts the IFCs by the number of times they appear, ranks the IFC "5655" that appears more frequently as the first shaft indices, and then ranks the IFC "6655" as the second shaft indices, and stores them in the storage unit 206. Note that in this specification, "ranking" refers to the degree of recommendation to the golfer who is the subject of fitting, and the higher the ranking, the higher the recommendation level.

[0047] [Display] The display unit 300 is, for example, a display that displays ranked shaft indices. FIG. 9 shows an example of fitting results displayed by the display unit 300. As shown in FIG. 9, recommended shafts (shaft indices) can be ranked and visually displayed. In the display unit 300 of this embodiment, the shaft indices IFC "5655" are displayed at the top as the first recommended shaft, and the shaft indices IFC "6655" are displayed below as the second recommended shaft. The recommended shaft (ranked first) is a shaft suitable for swings 1 to 3 above. That is, the recommended shaft (ranked first) tends to result in a longer ball flight distance and smaller left-right deviation when swings 1 to 3 are performed. On the other hand, the recommended shaft (ranked second) is a shaft suitable for swings 4 to 5 above. That is, the recommended shaft (ranked second) tends to result in a longer ball flight distance and smaller left-right deviation even when swings 4 to 5 are performed, which are considered to be miss shots. Therefore, by ranking and displaying swing indices according to the frequency of their appearance, as in the fitting method of this embodiment, it is possible to propose not only the best shaft indices that are more in line with the golfer's swing tendency, but also so-called second best shaft indices. Note that, although the shaft indices up to the second place are displayed in the example of Fig. 9, depending on the result of the determination unit 203, shaft indices from the third place onwards may be displayed.

[0048] Furthermore, the display unit 300 of this embodiment displays the "cocking movement" during the swing adjacent to each shaft indicator. This "cocking movement" is displayed as the magnitude of swing feature amounts F1 to F4. Furthermore, in this embodiment, the control unit 207 can display a list of one or more shafts (suitable shafts) that satisfy the first and second rankings of the recommended shaft indicators on the display unit 300. Displaying such suitable shafts can be easily achieved by previously storing in the storage unit 206 a database that associates IFCs with the product numbers, etc., of shafts that are suitable for each IFC.

[0049] As described above, the fitting system 1 and fitting method of this embodiment can determine shaft indices for identifying the appropriate shaft for each individual swing, including mishits, and display them in a ranked order. Therefore, the fitting device 1 and fitting method of this embodiment can recommend various shafts to golfers that correspond to their individual swings, including mishits. Furthermore, golfers can select, for example, a shaft index that corresponds to their ideal swing from the recommended shaft indices. In this way, the fitting system 1 and fitting method of this embodiment can respond to golfers' needs in a more detailed manner.

[0050] FIG. 10 shows another example of fitting results displayed by the display unit 300. As shown in FIG. 10, the control unit 207 may cause the display unit 300 to display, along with the recommended shaft indicator, the swing impact results corresponding to the shaft indicator. In this example, the first-ranked example is shown, with information about the recommended shaft displayed in the upper row and the impact results corresponding to the shaft indicator displayed below. As shown in FIG. 8, the impact results may include the left / right deviation of the ball, the tendency to hook or slice, and / or the height of the ball. In this manner, the golfer can more easily select a shaft that matches their desired impact tendency from among multiple options. Note that by scrolling the display unit 300, the second-ranked shaft indicator is also displayed in a similar manner.

[0051] In the above embodiment, an index related to the bending stiffness of the shaft 22 is used as the shaft index to select a shaft 22 suitable for a golfer. However, the present disclosure allows for the use of various indexes that were already known at the time of filing of this application 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).

[0052] 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.

[0053] [Note] The present disclosure includes the following aspects.

[0054] [Disclosure 1] A fitting device for selecting a golf club shaft suitable for a golfer, an acquisition unit that acquires measurement values from the swing sensor by performing a swing that strikes a golf ball multiple times with a golf club to which the swing sensor is attached; a calculation unit that calculates a swing feature amount for each swing based on the acquired measurement value; a determination unit that determines a shaft index for identifying a shaft that is appropriate for each swing based on the swing feature amount; and a ranking unit that ranks the determined shaft indexes. Golf club shaft fitting device. [Disclosure 2] The golf club shaft fitting device according to Disclosure 1, wherein the ranking unit ranks the shaft index that appears more frequently higher. [Disclosure 3] 3. The golf club shaft fitting device according to Disclosure 1 or 2, wherein the shaft indicator includes an indicator relating to the bending stiffness of the shaft. [Disclosure 4] 4. A golf club shaft fitting device according to any one of Disclosures 1 to 3, wherein the indicators include an indicator relating to the weight of the shaft. [Disclosure 5] A fitting system for selecting a golf club shaft suitable for a golfer, comprising: A swing sensor that can be attached to a golf club, and a fitting device described in any one of Disclosures 1 to 4, a display unit that displays the ranked shaft index, Golf club shaft fitting system. [Disclosure 6] The golf club shaft fitting system described in Disclosure 5, wherein the display unit displays the shaft indicator and the impact result of the swing corresponding to the shaft indicator. [Disclosure 7] A fitting method for selecting a golf club shaft suitable for a golfer, comprising: a step of performing a swing to strike a golf ball a plurality of times with a golf club to which a swing sensor is attached and acquiring measurement values from the swing sensor; calculating a swing feature amount for each swing based on the acquired measurement values; determining at least one shaft index for identifying a shaft suitable for each swing based on the swing feature amount; ranking the determined shaft indices; and displaying the ranked shaft index. How to fit a golf club shaft. [Disclosure 8] A fitting program for selecting a golf club shaft suitable for a golfer, comprising: a step of performing a swing to strike a golf ball a plurality of times with a golf club to which a swing sensor is attached and acquiring measurement values from the swing sensor; calculating a swing feature amount for each swing based on the acquired measurement values; determining at least one shaft index for identifying a shaft suitable for each swing based on the swing feature amount; ranking the determined shaft indices; and displaying the ranked shaft index. Golf club shaft fitting program. [Explanation of symbols]

[0055] 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 Decision Section 204 Ranking Section 210 Acquisition Department 300 Display F1~F4 Swing feature

Claims

1. A fitting device for selecting a golf club shaft suitable for a golfer, an acquisition unit that acquires measurement values from the swing sensor by performing a swing that strikes a golf ball multiple times with a golf club to which the swing sensor is attached; a calculation unit that calculates a swing feature amount for each swing based on the acquired measurement value; a determination unit that determines a shaft index for identifying a shaft that is appropriate for each swing based on the swing feature amount; and a ranking unit that ranks the determined shaft indexes. Golf club shaft fitting device.

2. The golf club shaft fitting device according to claim 1 , wherein the ranking unit ranks the shaft index that appears more frequently higher.

3. The golf club shaft fitting device according to claim 1 or 2, wherein the shaft indicator includes an indicator relating to the bending stiffness of the shaft.

4. 4. The golf club shaft fitting device according to claim 1, wherein the indicator includes an indicator relating to the weight of the shaft.

5. A fitting system for selecting a golf club shaft suitable for a golfer, comprising: a swing sensor that can be attached to a golf club; and the fitting device according to any one of claims 1 to 4; a display unit that displays the ranked shaft index, Golf club shaft fitting system.

6. The golf club shaft fitting system according to claim 5 , wherein the display unit displays the shaft indicator and a hitting result of a swing corresponding to the shaft indicator.

7. A fitting method for selecting a golf club shaft suitable for a golfer, comprising: a step of performing a swing to strike a golf ball a plurality of times with a golf club to which a swing sensor is attached and acquiring measurement values from the swing sensor; calculating a swing feature amount for each swing based on the acquired measurement values; determining at least one shaft index for identifying a shaft suitable for each swing based on the swing feature amount; ranking the determined shaft indices; and displaying the ranked shaft index. How to fit a golf club shaft.

8. A fitting program for selecting a golf club shaft suitable for a golfer, comprising: a step of performing a swing to strike a golf ball a plurality of times with a golf club to which a swing sensor is attached and acquiring measurement values from the swing sensor; calculating a swing feature amount for each swing based on the acquired measurement values; determining at least one shaft index for identifying a shaft suitable for each swing based on the swing feature amount; ranking the determined shaft indices; and displaying the ranked shaft index. Golf club shaft fitting program.

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