JP2016123487A - Golf club head fitting method and device thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a golf club head fitting method capable of achieving the accurate fitting of a golf club head that improves a carry performance for a golfer.SOLUTION: A golf club head fitting method includes: a step for measuring a head speed at the time when a subject swings a golf club for each of a plurality of golf clubs whose head weights are different; a step for acquiring kinetic energy of a golf club head based on the weight of the golf club head and a head speed measured when the golf club is swung for each of the plurality of golf clubs; and a step for estimating a head weight suitable for the subject based on the correlation between the calculated kinetic energy of the head and the head weight.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to a golf club head fitting, and more particularly to a technique for providing an optimum head for increasing a subject's flight distance.

  Selecting a golf club suitable for a golfer (for example, a golf club that is easy to fly away, and that is easy to fly in the direction and angle aimed at the ball) is generally referred to as fitting. Since each golfer has a different swing type and physical characteristics (eg, golfer's height, weight, arm length, etc.), this fitting is extremely important for the golfer to succeed.

  In order to perform this fitting effectively, it is necessary to consider various factors such as the total weight of the golf club, the weight of the club head, and the length of the golf club. The purpose of certain aspects of golf club fitting is to select a golf club that increases flight distance. In this case, in particular, the physical properties of the golf club head greatly affect the quality of the fitting.

  For example, Japanese Unexamined Patent Application Publication No. 2012-95850 (Patent Document 1) discloses a golf club fitting method. The fitting method uses a plurality of golf clubs having different head physical property values, and prepares a relationship in which a face angle before hitting or a hitting ball result is considered when a plurality of golfers swing, and a hitting result; A test ball hitting a test club to obtain a face angle measurement result; and a step of determining a head physical property suitable for the test subject based on the relationship and the face angle measurement result.

JP 2012-95850 A

  In Patent Document 1, focusing on the face angle, it is considered to determine a head property suitable for a golfer. However, the method disclosed in Patent Document 1 is not particularly sufficient as a method for selecting a golf club that increases the flight distance for a golfer.

  The present disclosure has been made to solve the above-described problems, and an object in one aspect thereof is a golf club capable of accurately fitting a golf club head that increases a flight distance for a golfer. It is to provide a head fitting method and a fitting apparatus.

  A method of fitting a golf club head according to an embodiment includes a step of measuring a head speed of a golf club swinging by a subject for each of a plurality of golf clubs having different head weights, and a plurality of golf clubs. Determining the kinetic energy of the head of the golf club based on the head weight of the golf club and the head speed measured during the swing of the golf club; and the calculated kinetic energy of the head and the head weight. Estimating a head weight suitable for the subject based on the correlation between the two.

  Preferably, the estimating step includes estimating the weight of the head when the kinetic energy of the head is maximized as a head weight suitable for the subject.

  Preferably, the golf club head fitting method includes a predetermined sweet spot on the face portion of the golf club head when the predetermined golf club is swung with respect to the ball by the subject, and hitting the ball. The method further includes measuring a relative position with respect to the position.

  Preferably, the golf club head fitting method further includes a step of outputting a head weight estimated by the estimating step and a relative position.

  Preferably, the golf club head fitting method further includes providing a head having a head weight estimated by the estimating step and a sweet spot adjusted based on the relative position.

  A golf club head fitting device according to another embodiment includes, for each of a plurality of golf clubs having different head weights, a head speed input unit that receives an input of a head speed when the golf club swings by a subject, For each golf club, an energy calculating unit that calculates the kinetic energy of the golf club head based on the head weight of the golf club and the head speed measured when the golf club swings, and the calculated head An estimation unit for estimating a head weight suitable for the subject based on the correlation between the kinetic energy of the head and the head weight.

  Preferably, the estimation unit estimates the weight of the head when the kinetic energy of the head is maximized as a head weight suitable for the subject.

  Preferably, the golf club head fitting device is configured such that when the predetermined golf club is swung with respect to the ball by the subject, the sweet spot on the face portion of the predetermined golf club head and the ball hitting A position input unit that receives an input of a relative position with respect to the position is further provided.

  Preferably, the golf club head fitting device further includes an output unit that outputs the head weight estimated by the estimation unit and the relative position received by the position input unit.

  Preferably, the output unit further outputs information indicating a difference between the head weight estimated by the estimation unit and a predetermined head weight of the golf club.

  According to the present disclosure, it is possible to accurately fit a golf club head that increases a flight distance for a golfer.

It is a flowchart which shows the fitting method of the head of the golf club according to this Embodiment. It is a figure which shows the whole structure of the system used for the fitting method of the head of the golf club according to this Embodiment. It is a block diagram which shows the hardware constitutions of the fitting apparatus according to this Embodiment. It is a figure which shows the face surface of the head to which the pressure sensitive paper for confirming a dent was affixed. It is a figure for demonstrating the relative position of the striking position with respect to a sweet spot. It is a figure which shows the measurement result of the relative position of the striking position with respect to the sweet spot when a test subject uses a plurality of golf clubs. It is a figure which shows head speed, a kinetic energy, and a flight distance when a test subject uses several golf clubs from which head weight differs. It is a figure which shows the relationship between a head weight and kinetic energy. It is a figure which shows the relationship between a head weight and a flight distance. It is a figure which shows the trial hit result at the time of using the head of the golf club after fitting. It is a functional block diagram of the fitting apparatus according to this Embodiment. It is a flowchart which shows an example of the process sequence of the fitting apparatus according to this Embodiment. It is a figure which shows the trial hit result when another test subject uses the predetermined golf club. It is a figure which shows head speed and kinetic energy when another test subject uses several golf clubs from which head weight differs. It is a figure which shows the relationship between a head weight and kinetic energy. It is a figure which shows the test hit result when another test subject uses the head of the golf club after fitting.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

<Overview>
FIG. 1 is a flowchart showing a golf club head fitting method according to the present embodiment. As shown in FIG. 1, the golf club head fitting method according to the present embodiment (hereinafter also simply referred to as “fitting method”) is performed for each of a plurality of golf clubs. Step S100 is included in which the relative position between the sweet spot of the face portion of the head of the golf club and the hitting position of the ball is measured. The hitting position of the ball is specified by the measurer confirming the hitting mark. For example, the pressure-sensitive paper is attached to the face surface, and the striking position is specified by confirming the dent. Typically, the hit position is the center point of the hit mark. Then, the relative position between the sweet spot and the hitting position is measured.

  The fitting method includes, for each of a plurality of golf clubs having different head weights, a step S110 of measuring a head speed when the golf club swings by the subject.

The fitting method includes, for each of the plurality of golf clubs, obtaining a kinetic energy of the head of the golf club based on the head weight of the golf club and the head speed measured when the golf club swings. . Specifically, E = 1 / 2MV ^{2 where} E is the kinetic energy of the head, V is the head speed, and M is the head weight.

  The fitting method includes step S130 of estimating a head weight suitable for the subject based on the correlation between the calculated kinetic energy of the head and the head weight. Specifically, in step S120, since the kinetic energy of a plurality of heads having different head weights is obtained, the correlation between the head weight and the kinetic energy can be grasped. Therefore, the head weight suitable for the subject can be estimated from this correlation. Typically, the weight of the head when the kinetic energy of the head is maximized is estimated as the head weight suitable for the subject. This is because the ball is launched when the moving head collides with the ball, so that it can be expected that the flying distance increases as the kinetic energy of the head immediately before colliding with the ball increases.

  The fitting method includes step S140 of outputting the relative position measured in step S100 and the head weight (estimated head weight) estimated in step S130. Specifically, the estimated head weight and relative position are displayed on a display or the like. Alternatively, the estimated head weight and relative position are notified by a speaker or the like. In addition, as long as a test subject (person) can recognize an estimated head weight and a relative position, the structure output in forms other than this may be sufficient.

  The fitting method includes step S150 of providing a head having a sweet spot adjusted based on the relative position measured in step S100 and an estimated head weight. For example, the sweet spot and the head weight are adjusted using a system in which resin is allowed to flow into the head. Specifically, the sweet spot is adjusted with the relative position as a target by adjusting the inflow position while flowing the viscous resin into the head and adjusting the head weight to the estimated head weight. A head having an adjusted sweet spot and head weight is then provided to the subject.

<Overall system configuration>
FIG. 2 is a diagram showing an overall configuration of a system used for the golf club head fitting method according to the present embodiment. Referring to FIG. 2, the system includes a golf club head fitting device 10 (hereinafter also simply referred to as “fitting device 10”) and a measuring device 20.

  In the present embodiment, the fitting device 10 is a notebook PC (Personal Computer), but can be realized as any device regardless of the type. For example, the fitting device 10 may be a device such as a desktop PC, a tablet terminal device, a PDA (Personal Digital Assistance), or a smartphone. The fitting device 10 functions as a device for fitting the head of the golf club using the measurement result obtained by the measuring device 20.

  The measuring device 20 is a device that can measure the head speed and the flight distance of the hit ball. For example, the measuring device 20 is a ballistic measuring device that can measure these data by tracking a ball trajectory using a Doppler radar. For example, the ballistic measuring device is a ballistic measuring device Trackman manufactured by Interactive Sports Games or a ballistic measuring device GC2 manufactured by Forestes. Other ballistic measuring devices may be used as long as the measurement accuracy is maintained. Further, the flight distance of the hit ball may be a flight distance actually measured in an actual course or a practice field.

  Note that the fitting device 10 and the measuring device 20 may be configured to be able to communicate with each other. For example, the fitting device 10 communicates with the measurement device 20 using Bluetooth (registered trademark), a wireless local area network (LAN), infrared communication, or the like. The fitting device 10 may be configured to be capable of wired communication using a USB (Universal Serial Bus) or the like. The fitting device 10 receives an input of a measurement result measured by the measuring device 20 and executes a process for fitting a golf club head.

<Hardware configuration of fitting device>
FIG. 3 is a block diagram showing a hardware configuration of fitting apparatus 10 according to the present embodiment. Referring to FIG. 3, fitting device 10 includes, as main components, CPU (Central Processing Unit) 100, memory 110, input device 120, display 130, communication interface (I / F) 140, and memory. Interface (I / F) 150.

  The CPU 100 controls the operation of each part of the fitting device 10 by reading and executing the program stored in the memory 110. More specifically, the CPU 100 realizes each process (step) of the fitting apparatus 10 to be described later by executing the program. The CPU 100 is, for example, a microprocessor.

  The memory 110 is realized by a RAM (Random Access Memory), a ROM (Read-Only Memory), a hard disk, or the like. The memory 110 stores a program executed by the CPU 100, data used by the CPU 100, and the like.

  The input device 120 receives an operation input to the fitting device 10. The input device 120 is realized by, for example, a keyboard, a button, a mouse, and the like. The input device 120 may be realized as a touch panel.

  The display 130 displays an image, text, and other information on the display screen based on a signal from the CPU 100. For example, the CPU 100 displays information on the golf club head suitable for the subject on the display 130.

  The communication interface (I / F) 140 is capable of exchanging various data between the fitting device 10 and the measuring device 20. The communication method may be, for example, wireless communication using Bluetooth (registered trademark), wireless LAN, or wired communication using USB or the like.

  A memory interface (I / F) 150 reads data from an external storage medium 152. More specifically, the CPU 100 reads data stored in the external storage medium 152 via the memory interface 150 and stores the data in the memory 110. The CPU 100 reads data from the memory 110 and stores the data in the external storage medium 152 via the memory interface 150. The storage medium 152 stores a program in a nonvolatile manner such as a CD (Compact Disc), a DVD (Digital Versatile Disk), a BD (Blu-ray (registered trademark) Disc), or a USB (Universal Serial Bus) memory. Medium.

<Flow of fitting>
Next, a flow until a golf club head suitable for the subject is fitted will be described.

(Relative position between sweet spot and striking position)
First, a method for measuring the relative position between the sweet spot and the hitting position will be described. FIG. 4 is a diagram showing the face surface of the head to which pressure-sensitive paper for confirming the dent is pasted. FIG. 5 is a diagram for explaining the relative position of the striking position with respect to the sweet spot.

  In the present embodiment, as shown in FIG. 4, a face-type pressure-sensitive paper is attached to the face surface of the head so that the measurer of the striking position can confirm the dent. Specifically, reference points and reference lines (vertical reference lines, horizontal reference lines, etc.) are printed on the pressure sensitive paper. The reference points are aligned with the sweet spot positions measured in advance, and the horizontal lines are parallel to the ground. And pasted on the face. In the present embodiment, the crown side and the sole side of the head are defined as an upper side and a lower side, respectively. Further, the toe side and the heel side are defined as the left side and the right side, respectively.

  When a golfer A who is a subject hits a ball using a golf club having pressure-sensitive paper attached to the face surface, a dent as shown in FIG. 5 remains. Since this dent is substantially circular, in this embodiment, the hitting center point is defined as the hitting position. In addition, the relative position of the hitting position (hitting center point) with respect to the sweet spot is represented by the relative position in the vertical direction and the horizontal direction. In particular, the vertical relative position is defined as the vertical hitting position, and the relative position in the horizontal direction is It is defined as the left / right strike position.

  FIG. 6 is a diagram illustrating a measurement result of the relative position of the striking position with respect to the sweet spot when the golfer A uses a plurality of golf clubs. Specifically, FIGS. 6A and 6B are a table and a graph showing measurement results of the relative positions when the golfer A uses five golf clubs having different head weights, respectively.

  In the present embodiment, a golf club having a head weight of 183.4 g is a golf club having a swing weight (swing balance) of D0, which is used as a reference club for the golfer A who is a man. This is because a general male golfer provides a golf club having a swing balance of D0.

  The swing balance is a numerical value indicating how well the golf club head is used (how easy it is to feel the weight of the head during a swing). The swing balance is measured by using a method (14 inch balance measurement method) that measures how heavy the head side is with a place 14 inches from the grip end as a fulcrum. Formula (1) for calculating the calculated value B (inch ounce) of the swing balance is as follows.

  Also, the swing balance is expressed as A0, A1,..., C8, C9, D0, D1, D2. The calculated value B of the swing balance of the D0 golf club (here, the reference club) is 213.50 (inch ounce).

  In order to obtain the measurement results shown in FIG. 6, golf players A have made five trial hits for each golf club. By confirming the dent for each trial hit, the relative position (upper and lower hit positions and left and right hit positions) of the hitting position (hitting center point) with respect to the sweet spot is measured. Typically, the relative position is measured using a measuring instrument (not shown) such as a measure. The relative position may be measured by analyzing an image obtained by capturing the face surface using a camera.

  Referring to FIG. 6, for example, when golfer A uses a golf club having a head weight of 183.4 g, the average value of five shots at the left and right strike positions is −7.7 mm, and five shots at the top and bottom strike positions. It can be seen that the average value of the shots is -5.3 mm. The left and right striking positions are represented as positive on the heel side and negative on the toe side of the sweet spot. In addition, the vertical hitting position is expressed with the upper side (head crown side) of the sweet spot as positive and the lower side (head sole side) as negative. Therefore, when Golfer A uses a golf club having a head weight of 183.4 g, it is understood that the hitting position (hit center point) is shifted 7.7 mm toe side and 5.3 mm below the sweet spot. (See FIG. 6 (b)).

  Similarly, FIG. 6 shows the measurement results of the left and right striking positions and the top and bottom striking positions when the golfer A uses a golf club having a head weight of 190.7 g, 198.5 g, 205.5 g, and 212.5 g. ing. Also shown are the average values of the left and right hit positions and the up and down hit positions of the five golf clubs that have been swung. Based on this average value, in the case of Golfer A, it can be seen that the hitting position is deviated on the 10.1 mm toe side and 2.3 mm lower side on the average relative to the sweet spot.

(Kinetic energy of the head)
Next, a method for calculating the kinetic energy of the golf club head will be described. FIG. 7 is a diagram showing the head speed, kinetic energy, and flight distance when the golfer A uses a plurality of golf clubs having different head weights. FIG. 8 is a diagram showing the relationship between the head weight and kinetic energy. FIG. 9 is a diagram showing the relationship between the head weight and the flight distance.

  In order to obtain the measurement results of the head speed and flight distance shown in FIG. 7, golf players A have made five trial hits for each golf club used for the relative position measurement in FIG. That is, in the present embodiment, the above-described measurement of the relative position and the measurement of the head speed and the flight distance are performed at the timing when the golfer A tries each golf club. However, the relative position measurement and the head speed and flight distance measurement may be measured at different timings.

  Typically, the head speed and the flight distance are measured using the measuring device 20. The measured head speed is the head speed just before impact in the swing of the golfer A. In the present specification, “immediately before impact” means a time point that is the same as the impact or a time that is a predetermined time (for example, about 5/100 seconds) before the impact time.

Referring to FIG. 7, for example, when golfer A uses a golf club having a head weight of 183.4 g, the average value of five head speeds is 43.0 m / s, and the flight distance is five times. It is shown that the average value of is 237.3yard. FIG. 7 also shows the kinetic energy of the head calculated based on the head weight and the head speed. Kinetic energy is expressed by E = 1 / 2MV ^2. Therefore, based on the head weight (183.4 g) and the head speed (43.0 m / s), the kinetic energy of the head is calculated as 169.6 J. Similarly, FIG. 7 shows the head speed, kinetic energy, and flight distance when Golfer A uses a golf club having a head weight of 190.7 g, 198.5 g, 205.5 g, and 212.5 g. .

  FIG. 8 shows a curve obtained by approximating the relationship between the head weight and kinetic energy by a normal distribution. Based on this curve, the kinetic energy increases as the head weight increases up to a certain value (here, 208.0 g), but thereafter, the kinetic energy decreases as the head weight increases. I can see it going. That is, the maximum kinetic energy (180 J) is obtained when the head weight is 208.0 g.

  FIG. 9 shows a curve that approximates the relationship between the head weight and the flight distance by a normal distribution. Based on this curve, the maximum flight distance of 249 yards is obtained when the head weight is 207.1 g. Thus, kinetic energy and flight distance have approximately the same correlation with the head weight. That is, when the maximum kinetic energy is obtained, it can be seen that the flight distance is almost maximized. Therefore, from the viewpoint of the flight distance, the weight of the head of the golf club suitable for the golfer A is estimated to be 208.0 g, which is the head weight that can obtain the maximum kinetic energy. Typically, the head weight is estimated by the fitting device 10 based on the measurement result of the measurement device 20.

(Output of relative position and head weight)
Next, the measured relative position and the estimated head weight (estimated head weight) are output. Specifically, the relative position and the estimated head weight are displayed on the display 130 of the fitting apparatus 10. For example, in the case of golfer A, information (for example, a table and a graph as shown in FIG. 6) indicating that the hitting position is shifted 10.1 mm toe side and 2.3 mm below the sweet spot. Information (for example, a numerical value or a graph as shown in FIG. 8) indicating that the optimum head weight is 208.0 g is displayed. Or the structure by which these information is alert | reported by the speaker (not shown) of the fitting apparatus 10 may be sufficient. Thereby, the golfer A can grasp the head weight suitable for himself and the relative position of the hitting position with respect to the sweet spot of the golf club used for the test hit. Further, the store clerk can select a golf club head suitable for the golfer A based on these pieces of information.

(Head adjustment)
From the above, in the case of Golfer A, the head weight was adjusted to 208.0 g, and the position of the sweet spot was adjusted to 10.1 mm toe side and 2.3 mm below the sweet spot of the golf club used for trial hitting. It is understood that it is sufficient to provide.

  The adjustment of the head is performed using, for example, a system in which resin is allowed to flow into the head. Specifically, the viscous resin is poured into the head and the head weight is adjusted to 208.0 g, and the inflow position is adjusted so that the target is 10.1 mm toe side and 2.3 mm below the current level. As the sweet spot moves.

  The head adjustment method is not limited to the method of injecting resin into the head. For example, a method of screwing a weight into the head, a method of inserting a weight into the shaft hole, a method of polishing the thickness of the head, a lead tape, etc. A known method such as a method of bonding to the head can be employed. Alternatively, instead of adjusting the weight of the current golf club head by adding a weight or the like, the head weight is 208.0 g, and a sweet spot which is 10.1 mm toe side and 2.3 mm lower than the current weight is provided. A head may be manufactured and provided to golfer A.

(Effect of fitting)
Next, the effect of increasing the flight distance after fitting by the golfer A will be described. Here, the flight distance when the golf club A makes a trial hit with the head of the 183.4 g golf club, which is the reference club, and the flight distance when the trial strike with the head adjusted by the fitting are compared. Specifically, the adjusted head has a head weight of 208.0 g and moves the sweet spot with a target of 10.1 mm toe side and 2.3 mm below the sweet spot of the reference club head. It is.

  FIG. 10 is a diagram showing a test hit result when the golf club head after fitting is used.

  Referring to FIG. 10, golf player A has performed four trial hits on the golf club after the fitting. The average values of the left and right strike positions, the top and bottom strike positions, the head speed, and the flight distance are -8.5 mm, -3.3 mm, 42.1 m / s, and 250.5 years, respectively. Note that the left and right hit positions and the upper and lower hit positions respectively indicate the relative positions in the vertical and horizontal directions of the hit position with respect to the sweet spot of the reference club of the golfer A.

  Here, as described above, the position of the sweet spot of the head after fitting is adjusted with a target of 10.1 mm toe side and 2.3 mm below the sweet spot of the head of the reference club. Therefore, it can be seen that the striking position after fitting (8.5 mm toe side and 3.3 mm lower side than the sweet spot of the head of the reference club) is closer to the relatively adjusted sweet spot than before the fitting.

  Referring to FIG. 10, the kinetic energy of the golf club head after fitting is 184.3 (J) from the head weight (208.0 g) and the head speed (42.1 m / s). On the other hand, the kinetic energy of the head of the reference club before fitting is 169.6 (J) (see FIG. 7). Thus, it can be seen that the kinetic energy of the golf club head after fitting is higher than that before fitting.

  Further, since the average value of the flying distance before fitting is 237.3 years (see FIG. 7) and the average value of the flying distance after fitting is 250.5 years, the distance after the fitting is longer than before the fitting. It can be seen that there is an increase of 13.2 years. This is considered to be due to the fact that the kinetic energy has increased and that the striking position is relatively close to the sweet spot. Specifically, referring to FIG. 9, it is estimated that the flight distance obtained when the golf club head weight (208.0 g) after fitting is 249 years. Therefore, it can be considered that the 1.5-yard portion is an effect of increasing the flight distance due to the hit position relatively approaching the sweet spot.

<Functional configuration>
Next, with reference to FIG. 11, a functional configuration for realizing fitting device 10 according to the present embodiment will be described. FIG. 11 is a functional block diagram of fitting apparatus 10 according to the present embodiment.

  Referring to FIG. 11, fitting apparatus 10 includes a position input unit 200, an input unit 210, a calculation unit 220, an estimation unit 230, and an output unit 240. These are basically realized by the CPU 100 of the fitting apparatus 10 executing a program stored in the memory 110 and giving a command to the components of the fitting apparatus 10. That is, the CPU 100 functions as a control unit that controls the overall operation of the fitting apparatus 10. Note that some or all of these functional configurations may be realized by hardware.

  For each of a plurality of golf clubs having different head weights, the position input unit 200, when the golf club is swung with respect to the ball by the subject, the sweet spot on the face portion of the head of the golf club, and the ball hitting Accepts the input of relative position. Specifically, the position input unit 200 receives an input of the relative position for each of the plurality of golf clubs via the input device 120.

  The input unit 210 receives, for each of a plurality of golf clubs having different head weights, an input of a head speed when the golf club swings by a subject. Specifically, the input unit 210 acquires the head speed at the time of swing of each golf club measured by the measuring device 20 via the communication interface 140. Further, the input unit 210 may accept input of measurement information of the measurement device 20 via the input device 120.

  For each of the plurality of golf clubs, the calculation unit 220 calculates the kinetic energy of the golf club head based on the head weight of the golf club and the head speed measured during the swing of the golf club. The head weight of each of the plurality of golf clubs and the kinetic energy calculation formula are stored in the memory 110 in advance.

  The estimation unit 230 estimates a head weight suitable for the subject based on the correlation between the calculated kinetic energy of the head and the head weight. Specifically, the estimation unit 230 generates a curve (for example, a normal distribution approximate curve) that approximates the relationship between the head weight and the kinetic energy based on the kinetic energy calculated for each head weight. And the estimation part 230 estimates the weight of the said head in case the kinetic energy of a head becomes the maximum as a head weight suitable for a test subject based on the said curve.

  The output unit 240 outputs the head weight (estimated head weight) estimated by the estimation unit 230 and the relative position received by the position input unit 200. Specifically, the output unit 240 displays the estimated head weight and relative position on the display 130, and outputs the estimated head weight and relative position from a speaker. The output unit 240 may further output information (difference information) indicating a difference between the estimated head weight and the reference head weight. The reference head weight is a head weight of a reference head (reference head) when adjusting to the estimated head weight. For example, the reference head weight is stored in the memory 110 in advance. By outputting the difference information, it is possible to immediately grasp how much the head weight should be increased (or decreased) from the reference head.

  The output unit 240 may be configured to print the estimated head weight and relative position on paper. Note that the output unit 240 may be configured to output only the estimated head weight and not the relative position.

<Processing procedure>
Next, with reference to FIG. 12, a processing procedure of fitting apparatus 10 according to the present embodiment will be described.

  FIG. 12 is a flowchart showing an example of the processing procedure of fitting apparatus 10 according to the present embodiment. The following steps are realized by the CPU 100 executing a program stored in the memory 110.

  Referring to FIG. 12, CPU 100 determines, for each golf club, whether an input of a relative position between the sweet spot of the golf club and the ball hitting position has been received via input device 120 (step). S10). When the input of the relative position for each golf club is not received (NO in step S10), CPU 100 repeats the process of step S10. On the other hand, when the input of the relative position for each golf club is received (YES in step S10), CPU 100 calculates an average value of the plurality of relative positions for which the input has been received (step S12).

  Next, the CPU 100 determines whether or not an input of the head speed at the time of swing of each golf club by the subject has been accepted via the communication interface 140 (step S14). If the input is not accepted (NO in step S14), CPU 100 repeats the process of step S14. On the other hand, when the input is accepted (YES in step S14), CPU 100 calculates the kinetic energy of the head of each golf club based on the head weight and head speed for each golf club (step S16). . The CPU 100 estimates a head weight suitable for the subject based on the correlation between the kinetic energy of the head and the head weight (step S18). Then, the CPU 100 displays the average value of the relative positions calculated in step S12 and the head weight estimated in step S18 on the display 130 (step S20), and ends the process.

<Example>
Here, the above-described fitting was performed on golfer B, which is a subject different from golfer A, and it was verified whether the flight distance increase effect could be obtained.

  FIG. 13 is a diagram showing a test hit result when the golfer B uses a predetermined golf club. The predetermined golf club is a golf club that Golfer B usually uses, and its head weight is 184.0 g. Referring to FIG. 13, golf player B has made five trial hits for this golf club (my club), and the average values of head speed, left and right hit positions, up and down hit positions and flight distance are 42.7 ( m / s), 9.6 mm, −5.0 mm, and 235.6 (yard). The left and right striking positions and the top and bottom striking positions are the relative positions in the up and down direction and the left and right direction of the striking position with respect to the sweet spot of the golf club B's My Club.

  FIG. 14 is a diagram showing head speed and kinetic energy when Golfer B uses a plurality of golf clubs having different head weights. The heads having a head weight of 192.0 g and 200.0 g are heads in which the head weight is increased by attaching lead or the like to a head having a head weight of 184.0 g. FIG. 15 is a diagram showing the relationship between the head weight and kinetic energy.

  Referring to FIG. 14, the golf club having a head weight of 184.0 g is the golf club B's My Club used for obtaining the measurement results shown in FIG. For golf clubs having head weights of 192.0 g and 200.0 g, golf player B has made five trial hits, and the average value of each head speed is 42.8 m / s and 42.2 m / s. I understand that. Also shown are the kinetic energies when Golfer B uses golf clubs with head weights of 184.0 g, 192.0 g, and 200.0 g. In the case of using 192.0 g and 200.0 g golf clubs, the left and right hit positions and the upper and lower hit positions are not measured.

  FIG. 15 shows a curve obtained by approximating the relationship between the head weight and kinetic energy by a polynomial distribution. As in the case of FIG. 8, the kinetic energy increases as the head weight increases up to a certain value (here, 199 g), but thereafter, the kinetic energy decreases as the head weight increases. I can see it going. That is, the maximum kinetic energy (178 J) is obtained when the head weight is 199 g.

  From the above, in the case of Golfer B, the head weight is adjusted to 199 g, and the position of the sweet spot is adjusted to 9.6 mm heel side and 5.0 mm below the sweet spot of Golfer B's My Club. You can see that it should be provided.

  The inflow position was adjusted while flowing the viscous resin into the head and adjusting the head weight to 199 g. Thereby, the position of the sweet spot moved to the 3.8 mm heel side and 1.9 mm lower side than the present condition.

  FIG. 16 is a diagram showing a test hit result when the golfer B uses the head of the golf club after the fitting. Referring to FIG. 16, golf player B has made five trial hits on the golf club after the fitting, and the average values of head speed, left and right hit positions, up and down hit positions and flight distance are 42.8 m / s, It turns out that it is 9.5 mm, -4.0 mm, and 238.6yard. The left and right hit positions and the up and down hit positions indicate the relative positions in the up and down direction and the left and right direction of the hit position with respect to the sweet spot of the golfer B's My Club.

  Since the position of the sweet spot is adjusted to the 3.8 mm heel side and the 1.9 mm lower side, it can be seen that the striking position after the fitting is closer to the sweet spot adjusted relatively than before the fitting.

  Referring to FIG. 16, the kinetic energy of the golf club head after fitting is 182.2 (J) from the head weight (199 g) and the head speed (42.8 m / s). On the other hand, the kinetic energy of the head of the golf club before fitting is 167.7 (J) (see FIG. 14). Thus, it can be seen that the kinetic energy of the golf club head after fitting is higher than that before fitting.

  Comparing FIG. 13 and FIG. 16, the effect of increasing the flight distance after fitting is 3.0 years. This is considered to be due to the fact that the kinetic energy has increased and that the striking position is relatively close to the sweet spot. From the above, it can be seen that also in the case of Golfer B, the effect of increasing the flight distance is obtained by fitting.

  In this embodiment, the relative position between the sweet spot and the ball hitting position is measured only at the golf club B's My Club. ing. Therefore, it is not always necessary to measure the relative position of each golf club. The relative position between the sweet spot of the face portion of the head of a predetermined golf club (for example, My Club of Golfer B) and the hit position of the ball It can be seen that the position may be measured.

  In the case of the golfer A fitting, the head weight suitable for the golfer A was estimated using five golf clubs having different head weights. However, in the case of the golfer B fitting, it was possible to estimate a head weight suitable for the golfer B using three golf clubs having different head weights. From this, it is only necessary to generate an approximate curve that can estimate the head weight at which the kinetic energy is maximized by using a plurality of golf clubs having different head weights, and the number thereof is not limited.

<Other embodiments>
In the above-described embodiment, the configuration in which the fitting method includes step S100 to step S150 in FIG. 1 has been described, but the present invention is not limited to this. For example, the fitting method may not include step S100 for measuring the relative position. In this case, in step S150, only the head weight estimated in step S130 is output.

  It is also possible to provide a program that causes a computer to function and execute control as described in the above flowchart. Such a program is recorded on a non-temporary computer-readable recording medium such as a flexible disk attached to the computer, a CD-ROM (Compact Disk Read Only Memory), a ROM, a RAM, and a memory card as a program product. It can also be provided. Alternatively, the program can be provided by being recorded on a recording medium such as a hard disk built in the computer. A program can also be provided by downloading via a network.

  The program may be a program module that is provided as a part of a computer operating system (OS) and that calls a required module at a predetermined timing to execute processing. In that case, the program itself does not include the module, and the process is executed in cooperation with the OS. A program that does not include such a module can also be included in the program according to the present embodiment.

  Further, the program according to the present embodiment may be provided by being incorporated in a part of another program. Even in this case, the program itself does not include the module included in the other program, and the process is executed in cooperation with the other program. A program incorporated in such another program can also be included in the program according to the present embodiment.

  The configuration illustrated as the above-described embodiment is an example of the configuration of the present invention, and can be combined with another known technique, and a part of the configuration is omitted without departing from the gist of the present invention. It is also possible to change the configuration.

<Effect of Embodiment>
According to the present embodiment, it is possible to provide a head having a head weight that maximizes the kinetic energy of the head for the subject. Thereby, a subject's flight distance can be increased.

  In addition, according to the present embodiment, since the sweet spot of the head can be set in the vicinity of the hit position of the subject, the kinetic energy of the head can be efficiently transmitted to the ball. Therefore, the flight distance of the subject can be increased, and the hitting sensation can be enhanced.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  10 fitting device, 20 measuring device, 100 CPU, 110 memory, 120 input device, 130 display, 140 communication interface, 150 memory interface, 152 storage medium, 200 position input unit, 210 input unit, 220 calculating unit, 230 estimating unit, 240 Output unit.

Claims (10)

For each of a plurality of golf clubs having different head weights, measuring a head speed when the golf club swings by a subject;
For each of the plurality of golf clubs, obtaining the kinetic energy of the head of the golf club based on the head weight of the golf club and the head speed measured during the swing of the golf club;
A method of fitting a head of a golf club, comprising: estimating the head weight suitable for the subject based on the correlation between the calculated head kinetic energy and the head weight.   2. The golf club head fitting method according to claim 1, wherein the estimating step includes estimating a weight of the head when the kinetic energy of the head is maximized as the head weight suitable for the subject. .   A step of measuring a relative position between a sweet spot of a face part of the head of the predetermined golf club and a hitting position of the ball when the predetermined golf club is swung with respect to the ball by the subject; The golf club head fitting method according to claim 1, further comprising:   4. The golf club head fitting method according to claim 3, further comprising a step of outputting the head weight estimated by the estimating step and the relative position.   5. The golf club head fitting method according to claim 3, further comprising providing a head having a head weight estimated by the estimating step and a sweet spot adjusted based on the relative position. . For each of a plurality of golf clubs having different head weights, a head speed input unit that receives an input of a head speed at the time of swing of the golf club by a subject;
For each of the plurality of golf clubs, an energy calculating unit that calculates kinetic energy of the head of the golf club based on the head weight of the golf club and a head speed measured when the golf club swings;
A golf club head fitting apparatus, comprising: an estimation unit configured to estimate the head weight suitable for the subject based on a correlation between the calculated head kinetic energy and the head weight.   The golf club head fitting device according to claim 6, wherein the estimation unit estimates the weight of the head when the kinetic energy of the head is maximum as the head weight suitable for the subject.   When a predetermined golf club is swung with respect to the ball by the subject, an input of a relative position between the predetermined sweet spot of the face portion of the head of the golf club and the hit position of the ball is received. The golf club head fitting device according to claim 6, further comprising a position input unit.   9. The golf club head fitting device according to claim 8, further comprising an output unit that outputs the head weight estimated by the estimation unit and the relative position received by the position input unit.   The golf club head fitting device according to claim 9, wherein the output unit further outputs information indicating a difference between a head weight estimated by the estimation unit and a reference head weight.

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