Golf swing determination device, determination method, and determination program

Abstract

The present invention evaluates a swing motion from a take-back motion during a golf swing. The present invention includes: an acquisition unit 204 that acquires measurement data from a swing sensor 100 when a target golfer performs a swing motion using a golf club to which the swing sensor 100 is attached; an extraction unit 205 that extracts a take-back section of the swing motion from the measurement data; a calculation unit 206 that calculates at least one swing index obtained by quantifying a predetermined motion, from the measurement data of the take-back section; and an evaluation unit 207 that evaluates the swing motion on the basis of the swing index. The at least one swing index includes an index calculated on the basis of an angular velocity ωx around an x-axis, the x-axis being orthogonal to an axis of a golf club shaft of the golf club and along a direction from the heel to the toe of the golf club head, and / or an angular velocity ωy around a y-axis, the y-axis being orthogonal to the axis of the shaft and along a target ball flight line direction.

Description

Golf swing evaluation device, evaluation method, and evaluation program

[0001] The present invention relates to a golf swing judgment device, a judgment method, and a judgment program.

[0002] In recent years, various methods for analyzing a golfer's swing have been proposed. For example, Patent Document 1 listed below proposes a method of measuring a golfer's swing motion, calculating swing feature amounts from the swing motion, determining shaft indices to be recommended to the golfer from the swing feature amounts, and analyzing the swing based on the shaft indices.

[0003] Japanese Patent Application Laid-Open No. 2023-119950

[0004] While golfers always try to perform the same swing motion while playing golf, in reality, the swing motion tends to vary from shot to shot, and such variations in swing motion tend to lead to missed shots.

[0005] As a result of research by the inventors, it has been found that the take-back motion during a swing from address to the top has a significant effect on the downswing, including the subsequent impact with the ball. Therefore, the quality of a swing can be evaluated by analyzing the take-back motion during a swing.

[0006] On the other hand, in a typical take-back motion, the rotational movement of the golf club around the shaft axis is very small. Therefore, when analyzing the take-back motion, it is important to focus on the movement of the golf club other than around the shaft axis.

[0007] The present invention has been devised in view of the above-described circumstances, and its main objective is to provide a golf swing judgment device, judgment method, and judgment program that can evaluate a swing motion from the take-back motion during a golf swing.

[0008] The present invention is a golf swing judgment device that includes an acquisition unit that acquires measurement data from a swing sensor when a target golfer performs a swing motion using a golf club to which the swing sensor is attached, an extraction unit that extracts a take-back section of the swing motion from the measurement data, a calculation unit that calculates at least one swing index that quantifies a predetermined motion from the measurement data of the take-back section, and an evaluation unit that evaluates the swing motion based on the swing index, wherein the at least one swing index includes an index calculated based on an angular velocity ωx about an x-axis that is perpendicular to an axis of a golf club shaft of the golf club and extends in a direction from the heel to the toe of the golf club head, and / or an angular velocity ωy about a y-axis that is perpendicular to the axis of the shaft and extends in the direction of a target ball flight line.

[0009] By employing the above-described configuration, the golf swing judging device of the present invention can evaluate the swing motion from the take-back motion during the golf swing.

[0010] 5 is a diagram showing an overall configuration of a golf swing judgment system according to the present embodiment; FIG. 6 is a schematic block diagram of the golf swing judgment system according to the present embodiment; FIG. 7 is a flowchart showing an example of a golf swing judgment method according to the present embodiment; FIG. 8 is a graph showing the angular velocity ωx of a golf club during a golf swing; FIG. 9 is a graph showing the angular velocity ωy of a golf club during a golf swing; FIG. 10 is a diagram showing a golf club when a golfer addresses the ball as viewed from the front; FIG. 11 is a diagram showing a golf club when a golfer addresses the ball as viewed from the front in the direction of a target ball flight line; FIG. 12 is a graph showing an enlarged view of the take-back section of FIG. 4; FIG. 13 is a graph showing an enlarged view of the take-back section of FIG. 14; FIG. 15 is a flowchart showing an example of a swing evaluation step in the flowchart of FIG. 3; FIG. 16 is an example of an alert display; (A) is a graph of the angular velocity ωx of golfer A's golf swing, and (B) is a graph of the angular velocity ωy of golfer A's golf swing. (A) to (D) are graphs showing swing indicators of golfer A's golf swing. (A) is a graph of the angular velocity ωx of the golf swing of golfer B, and (B) is a graph of the angular velocity ωy of the golf swing of golfer B. (A) to (F) are graphs showing swing indicators of the golf swing of golfer B. (A) is a graph of the angular velocity ωx of the golf swing of golfer C, and (B) is a graph of the angular velocity ωy of the golf swing of golfer C. (A) to (F) are graphs showing swing indicators of the golf swing of golfer C. (A) is a graph of the angular velocity ωx of the golf swing of golfer D, and (B) is a graph of the angular velocity ωy of the golf swing of golfer D. (A) to (F) are graphs showing swing indicators of the golf swing of golfer D.

[0011] Hereinafter, one 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 swing determination system 1 according to this embodiment. Furthermore, FIG. 2 shows a schematic block configuration diagram of the golf swing determination system 1 according to this embodiment. The golf swing determination system 1 and determination method according to this embodiment measure the swing motion of a golfer 3 who wishes to have their golf swing evaluated, and can quantitatively evaluate the swing motion. The system and method according to this embodiment can provide an appropriate alert to the target golfer as necessary. Therefore, the golf swing determination system 1 according to the present disclosure can contribute to improving the swing of the golfer 3.

[0013] As shown in FIGS. 1 and 2, a golf swing determination system 1 of this embodiment includes, for example, a swing sensor 100 that can be attached to a golf club 2, a golf swing determination device 200, and a display unit 300.

[0014] 1, a golf club 2 has, for example, a grip 21, a golf club shaft 22, and a golf club 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] 1 , the swing sensor 100 is configured to be attachable to, for example, a golf club 2. The swing sensor 100 of this embodiment is attached to a grip end, which is an end of the grip 21 of the golf club 2, 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 motion when hitting the ball 4, for example. As shown in FIG. 2 , the swing sensor 100 of this embodiment is, for example, an inertial sensor and includes an angular velocity measurement unit 101. This angular velocity measurement unit 101 measures the angular velocity of the golf club 2 about a predetermined axis during a swing, as the physical quantity. In a preferred embodiment, the swing sensor 100 measures the angular velocity about at least one axis of a three-dimensional local coordinate system associated with the golf club 2. In another embodiment, the swing sensor 100 may measure the angular acceleration of the golf club 2.

[0017] As shown in FIG. 1 , the local coordinate system of the golf club 2 includes, for example, x, y, and z axes, and its origin is located near the grip end. The z axis is aligned with the axis of the golf club shaft 22. The x axis is perpendicular to the z axis and is aligned along the heel-to-toe direction of the golf club head 23. The y axis is perpendicular to the z axis and is aligned along the target ball flight line when the golf club 2 is addressed (i.e., perpendicular to the plane of FIG. 1 ). The swing sensor 100 of this embodiment can measure the angular velocities ωx and ωy about the x and y axes, respectively, during a swing at a very short, predetermined sampling period (e.g., 1 millisecond).

[0018] As shown in FIG. 2 , the swing sensor 100 of this embodiment further includes a communication unit 102 for providing data on the measured angular velocities ωx and ωy to the golf swing determination device 200. The communication unit 102 is preferably a wireless unit so as not to interfere with the swing motion. In another aspect, the communication unit 102 may be a wired unit. Furthermore, the swing sensor 100 may include a removable storage medium (not shown) instead of or in addition to the communication unit 102. In this case, the angular velocity data may be temporarily stored in the storage medium and then imported into the determination device 200 via this storage medium.

[0019] [Determination Device] The golf swing determination device 200 of this embodiment acquires measurement data from the swing sensor 100 and executes predetermined processing to evaluate the swing motion of a target golfer. The determination device 200 is implemented by, for example, a computer, and is realized as, among other things, various general-purpose personal computers, tablet computers, smartphones, or even dedicated terminals. An example of the processing procedure of the determination device 200 is shown in FIG. 3.

[0020] 2, the determination device 200 includes a control unit 201, a working memory unit 202, and an input unit 203. The control unit 201 operates the units described below in accordance with the determination program of this embodiment, and is configured, for example, by a central processor (CPU). The memory unit 202 serves as a working memory. The input unit 203 is configured, for example, by a keyboard, a mouse, a virtual keyboard of a tablet, etc.

[0021] Determination device 200 further includes an acquisition unit 204 that acquires measurement data from swing sensor 100, an extraction unit 205 that extracts a take-back section of the swing motion from the measurement data, a calculation unit 206 that calculates at least one swing index that quantifies a predetermined motion from the measurement data of the take-back section, and an evaluation unit 207 that evaluates the swing motion based on the swing index. Determination device 200 of the present embodiment also includes an alert data storage unit 208 that stores a prepared alert, a reference swing index storage unit 209 that stores prepared reference swing indexes, and a determination program storage unit 210 that stores the processing procedures of the determination method of the present embodiment.

[0022] [Acquisition Unit] In this embodiment, the acquisition unit 204 is configured to be able to communicate wirelessly with the communication unit 102 of the swing sensor 100. The acquisition unit 204 in this embodiment acquires, via the communication unit 102, measurement data of the swing sensor 100 when the target golfer performs a swing motion using the golf club 2 to which the swing sensor 100 is attached (step S1 in FIG. 3). In addition, the measurement data acquired by the acquisition unit 204 is stored in the memory unit 202, for example.

[0023] 4 and 5 show an example of measurement data acquired by the acquisition unit 204 from the swing sensor 100. Figures 4 and 5 are graphs showing time-series changes in the angular velocities ωx and ωy of the golf club 2 measured by the swing sensor 100 during a swing motion including, for example, the section from address to impact. As shown in Figure 6, the positive angular velocity ωx is in the counterclockwise direction around the x-axis of the golf club 2 when the target golfer's address is viewed from the front. As shown in Figure 7, the positive angular velocity ωy is in the counterclockwise direction around the y-axis of the golf club 2 when the target golfer's address is viewed from the front in the direction of the target ball flight line.

[0024] [Extraction Unit] The extraction unit 205 extracts the take-back section of the swing motion from the measurement data acquired by the acquisition unit 204 (step S2 in FIG. 3). In this specification, the take-back section refers to the section from the address where the golf club is held up (a state where the golf club is essentially stationary) where the golf club starts to move and ends when the golf club is swung up to the highest position (the so-called top). As described above, the take-back section has a significant impact on the quality of the downswing, including the subsequent ball impact, so the determination device 200 of this embodiment focuses on the swing motion in the take-back section.

[0025] The extraction unit 205 determines the start point of the take-back section by, for example, examining the measurement data of Figures 4 and 5 at the time when the angular velocities ωx and ωy begin to change from a zero state (address) to a positive or negative value, and identifies that time or a time rewound several milliseconds from that time. In Figures 4 and 5, the start point of the take-back section is indicated by a fine dashed line as "address (start of swing)." Furthermore, the extraction unit 205 determines the end point of the take-back section by examining the time when the angular velocity ωy of the golf club 2 becomes zero when it switches from a negative value to a positive value, and identifies this time as the end point of the take-back section. In Figures 4 and 5, the end point of the take-back section is indicated by a coarse dashed line as "top." By applying the end time of the take-back section determined by the angular velocity ωy to the measurement data of Figure 5, the end point of the take-back section can also be determined for the measurement data of Figure 4. Then, the extraction section 205 stores the data identified as the take-back section in the storage section 202 .

[0026] The calculation unit 206 calculates at least one swing indicator that quantifies a predetermined movement from the measurement data of the backswing section (step S3 in FIG. 3). In this embodiment, the at least one swing indicator includes an indicator calculated based on (1) the angular velocity ωx about the x-axis of the local coordinate system of the golf club 2 and / or (2) the angular velocity ωy about the y-axis of the local coordinate system of the golf club.

[0027] As a result of research by the inventors, it was found that, in a typical take-back motion, the rotational movement around the axis of the golf club shaft 22 (i.e., around the z-axis) is very small, and therefore, in order to evaluate and analyze the take-back motion, it is important to focus on the movement of the golf club 2 other than around the axis of the golf club shaft 22. Therefore, the determination device 200 of this embodiment employs an index based on the angular velocity ωx and / or ωy of the golf club as a swing index. Below, some preferred examples of such swing indexes will be described assuming the swing of a right-handed golfer.

[0028] [First Swing Indicator: Timing of Pronation and Supination Movements] The swing indicator may include, for example, a first swing indicator related to the timing of pronation and supination movements. During the initial movement of the backswing, the gripping left hand undergoes pronation, in which the thumb rotates clockwise. In other words, the gripping right hand supinsates in the opposite direction to the left hand. In this embodiment, the first swing indicator related to the timing of such pronation and supination movements is the time t1 from the start of the swing to the maximum negative value of the angular velocity ωx of the golf club 2, as shown in FIG. 8 . Time t1 can be considered to be the time from the start of the swing to the completion of the pronation and supination movements. Various experiments have shown that, when examining golf swings of various golfers who hit good shots, the time until the completion of the pronation and supination movements is approximately constant (although there are differences between individual golfers). Furthermore, if time t1 deviates from the reference value for each individual golfer, not only the takeback movement but also the subsequent downswing may deteriorate. Therefore, the first swing index is one of the effective indexes for evaluating a swing motion.

[0029] [Second Swing Indicator: Magnitude of Pronation / Supination] The swing indicator may include, for example, a second swing indicator related to the magnitude of pronation / supination. As shown in FIG. 8 , the second swing indicator is the integral value of the angular velocity ωx of the golf club from the start of the swing until the angular velocity ωx reaches its maximum negative value (the area of ​​the hatched area in FIG. 8 ). The second swing indicator can be considered as the magnitude of pronation / supination at the start of the backswing. Various experiments have shown that, when examining the golf swings of various golfers performing good shots, the magnitude of pronation / supination at the start of the backswing is almost constant (although there are differences between individual golfers). Furthermore, if the magnitude of pronation / supination deviates from the reference value for each individual golfer, not only the backswing but also the subsequent downswing may deteriorate. Therefore, the second swing indicator is one of the effective indicators for evaluating a swing.

[0030] [Third Swing Motion: Timing of Golf Club Lifting Motion] The swing indicator may include, for example, a third swing indicator related to the timing of the motion of lifting the golf club 2. As shown in FIG. 9 , the third swing indicator is the time t2 from the start of the swing until the positive value of the angular velocity ωy of the golf club 2 reaches its maximum. Generally, when starting the backswing, the golfer lifts the golf club 2. In this embodiment, this motion of lifting the golf club is detected as a positive value of the angular velocity ωy of the golf club. Therefore, time t2 can be considered the timing of lifting the golf club when starting the backswing. Various experiments have shown that, when examining the golf swings of various golfers when they make good shots, the timing of lifting the golf club is almost constant (although there are differences between individual golfers). Furthermore, if the timing of lifting the golf club deviates from the reference value for each individual golfer, not only the backswing motion but also the subsequent downswing deteriorates. Therefore, the third swing indicator is one of the indicators that can be used to evaluate a swing motion.

[0031] [Fourth Swing Indicator: Amplitude of the Movement to Lift the Golf Club] The swing indicator may include, for example, a fourth swing indicator related to the magnitude of the movement to lift the golf club. The fourth swing indicator is the integral value of the angular velocity ωy of the golf club 2 during the period from the start of the swing in which the angular velocity ωy is a positive value (the area of ​​the gray hatched portion in FIG. 9). The fourth swing indicator can be considered as the magnitude of the movement to lift the golf club 2 when starting the backswing. As a result of various experiments, when examining the golf swings of various golfers when they make good shots, the magnitude of the movement to lift the golf club 2 is almost constant (although there are differences between individual golfers). Furthermore, if the magnitude of the movement to lift the golf club 2 deviates from the reference value for each golfer, not only the backswing but also the subsequent downswing may deteriorate. Therefore, the fourth swing indicator is one of the indicators that can be used to evaluate a swing motion.

[0032] [Fifth Swing Indicator: Timing of Cocking] The swing indicators may include, for example, a fifth swing indicator related to the timing of the cocking motion. The fifth swing indicator is the time t3 from the start of the swing until the angular velocity ωy of the golf club reaches its maximum negative value. Time t3 can be considered as the time until the cocking motion during the take-back is completed. The cocking motion refers to the movement of bending the wrist toward the thumb when swinging the golf club 2 up during a typical take-back. As a result of various experiments, when examining the golf swings of various golfers during good shots, the timing at which the cocking motion is completed is almost constant (although there are differences between individual golfers). Furthermore, if the timing at which the cocking motion is completed deviates from the reference value for each golfer, not only the take-back motion but also the subsequent downswing may deteriorate. Therefore, the fifth swing indicator is one of the indicators that can be used to evaluate a swing motion.

[0033] [Sixth Swing Indicator: Magnitude of Cocking] The swing indicators may include, for example, a sixth swing indicator related to the magnitude of the cocking motion. As shown in FIG. 9 , the sixth swing indicator is the integral value of the angular velocity ωy of the golf club in the section where the angular velocity ωy takes a negative value (the area of ​​the diagonally hatched portion in FIG. 9 ). The sixth swing indicator can be considered as the magnitude of the cocking motion during the take-back. As a result of various experiments, when examining the golf swings of various golfers when they make good shots, the magnitude of the cocking motion is almost constant (although there are differences between individual golfers). Furthermore, if the magnitude of the cocking motion deviates from the reference value for each golfer, not only the take-back motion but also the subsequent downswing may deteriorate. Therefore, the sixth swing indicator is one of the indicators that can be used to evaluate a swing motion.

[0034] Although the first to sixth swing indicators have been described above as swing indicators, at least one, preferably two or more, and more preferably all indicators selected from these may be employed.

[0035] The evaluation unit 207 evaluates the swing motion of the target golfer based on the swing indices described above (e.g., at least one of the first to sixth swing indices) (step S4 in FIG. 3). An example of the processing procedure of the evaluation unit 207 is shown in FIG. 10.

[0036] The evaluation unit 207 of this embodiment includes, for example, a comparison unit 207A. The comparison unit 207A compares the swing index of the target golfer with predetermined reference swing indexes and outputs the comparison result (step S41 in FIG. 10 ). The reference swing index is, for example, an index that serves as a model for the target golfer's swing. In this embodiment, the reference swing index is the first to sixth swing indexes calculated from the swing motion of one or more nice shots (preferably, objective nice shots determined from the direction and distance of the ball) measured in the past by the target golfer. These reference swing indexes are pre-stored in the reference swing index storage unit 209 of the determination device 200.

[0037] The evaluation unit 207 of this embodiment further includes an alert display unit 207B. The alert display unit 207B determines whether the comparison result is within a predetermined tolerance range (step S42 in FIG. 10 ). When the comparison result is outside the predetermined tolerance range, the alert display unit 207B displays an alert on the display unit 300 (step S43 in FIG. 10 ). On the other hand, when the comparison result is within the predetermined tolerance range, the alert display unit 207B does not display an alert (step S44 in FIG. 10 ).

[0038] The allowable range as a criterion is determined in advance. For example, when the reference swing indicators are the first through sixth swing indicators calculated from a golf swing measured in the past by the target golfer, the allowable range may be set to any allowable range, such as a range of ±5% or ±10% for each of the first through sixth swing indicators. As another aspect, when the reference swing indicators are the first through sixth swing indicators calculated from a plurality of nice shots performed in the past by the target golfer, the allowable range may be set to a range of the standard deviation (-1σ to +1σ) or (-2σ to +2σ) for each of the first through sixth swing indicators of the plurality of nice shots.

[0039] The alerts include information useful for improving the target golfer's swing. The alerts are also information associated with the respective swing indicators. Fig. 11 shows an example of an alert stored in the alert data storage unit 208. As shown in Fig. 11, an alert to be displayed is prepared for each of the first through sixth swing indicators.

[0040] 11 , for example, if the alert display unit 207B determines that the first swing indicator of the target golfer is larger than the allowable range, it selects alert A1 and causes the display unit 300 to display this. The display unit 300 displays text information such as "The timing of the pronation and supination movements during the take-back is delayed." On the other hand, if the alert display unit 207B determines that the first swing indicator of the target golfer is smaller than the allowable range, it selects alert A2 and causes the display unit 300 to display this. The display unit 300 displays text information such as "The timing of the pronation and supination movements during the take-back is early."

[0041] Furthermore, for example, if the alert display unit 207B determines that the second swing indicator of the target golfer is larger than the allowable range, it selects alert A3 and causes it to be displayed on the display unit 300. The display unit 300 displays text information such as "The pronation / supination movements are large at the start of the backswing." On the other hand, for example, if the alert display unit 207B determines that the second swing indicator of the target golfer is smaller than the allowable range, it selects alert A4 and causes it to be displayed on the display unit 300. The display unit 300 displays text information such as "The pronation / supination movements are small at the start of the backswing."

[0042] Furthermore, for example, if the alert display unit 207B determines that the third swing indicator of the target golfer is larger than the allowable range, it selects alert A5 and causes it to be displayed on the display unit 300. The display unit 300 displays text information such as "The timing of lifting the club during the backswing is late." On the other hand, for example, if the alert display unit 207B determines that the third swing indicator of the target golfer is smaller than the allowable range, it selects alert A6 and causes it to be displayed on the display unit 300. The display unit 300 displays text information such as "The timing of lifting the club during the backswing is early."

[0043] Furthermore, for example, if the alert display unit 207B determines that the fourth swing indicator of the target golfer is larger than the allowable range, it selects alert A7 and causes it to be displayed on the display unit 300. The display unit 300 displays text information such as "The club lifting motion at the start of the take-back is too large." On the other hand, for example, if the alert display unit 207B determines that the fourth swing indicator of the target golfer is smaller than the allowable range, it selects alert A8 and causes it to be displayed on the display unit 300. The display unit 300 displays text information such as "The club lifting motion at the start of the take-back is too small."

[0044] Furthermore, for example, if the alert display unit 207B determines that the fifth swing indicator of the target golfer is larger than the allowable range, it selects alert A9 and causes it to be displayed on the display unit 300. The display unit 300 displays text information such as "The timing of the cocking motion during the take-back is late." On the other hand, for example, if the alert display unit 207B determines that the fifth swing indicator of the target golfer is smaller than the allowable range, it selects alert A10 and causes it to be displayed on the display unit 300. The display unit 300 displays text information such as "The timing of the cocking motion during the take-back is early."

[0045] Furthermore, for example, if the alert display unit 207B determines that the sixth swing indicator of the target golfer is larger than the allowable range, it selects alert A11 and causes it to be displayed on the display unit 300. The display unit 300 displays an alert stating, "The cocking motion during the take-back is large." On the other hand, for example, if the alert display unit 207B determines that the sixth swing indicator of the target golfer is smaller than the allowable range, it selects alert A12 and causes it to be displayed on the display unit 300. The display unit 300 displays an alert stating, "The cocking motion during the take-back is small."

[0046] The golf swing evaluation device 200 and evaluation method of this embodiment configured as described above can evaluate a swing motion from the take-back motion during a golf swing. Furthermore, if necessary, the swing index of the target golfer can be compared with a reference swing index, and if the comparison result is outside a predetermined tolerance range, an alert can be displayed to help improve the target golfer's swing. Below, the results of evaluating the golf swings of four target golfers will be explained.

[0047] [Golfer A] Figure 12(A) shows measurement data of the angular velocity ωx of golfer A's golf swing, and Figure 12(B) shows measurement data of the angular velocity ωy of golfer A's golf swing. In Figures 12(A) and 12(B), graph α is the golf swing to be judged, and graph β is measurement data of a model golf swing measured in the past by golfer A. From these graphs β, reference swing indicators for each of golfer A's first to sixth swing indicators are determined. The reference swing indicator is the average value of graph β, and the allowable range is its standard deviation (-1σ to +1σ) (the same applies below).

[0048] 13A to 13D are graphs showing the first swing index, second swing index, fifth swing index, and sixth swing index of golfer A's golf swing. In each graph, the left side is the reference swing index, and the error bars indicate a standard deviation of 1σ. The right side is the swing index to be judged (the same applies below). Note that the third swing index and fourth swing index could not be quantified from golfer A's golf swing to be judged this time. As is clear from FIG. 13 , the first swing index, second swing index, fifth swing index, and sixth swing index of golfer A's golf swing to be judged all fell outside the allowable range. Therefore, the evaluation unit 207 of the judgment device 200 displayed alerts A1, A4, A9, and A11 as text information on the display unit 300 in accordance with the judgment results.

[0049] [Golfer B] Fig. 14(A) shows measurement data of the angular velocity ωx of the golf swing of golfer B, and Fig. 14(B) shows measurement data of the angular velocity ωy of the golf swing of golfer B. In Figs. 14(A) and 14(B), graph α is the golf swing to be judged, and graph β is measurement data of a model golf swing measured in the past by golfer B. From these graphs β, reference swing indicators for each of golfer B's first to sixth swing indicators are determined.

[0050] 15A to 15F are graphs showing the first to sixth swing indicators of the golf swing of golfer B. As is clear from Fig. 15, the first swing indicator, the third swing indicator, the fourth swing indicator, and the fifth swing indicator of the golf swing to be judged of golfer B were outside the allowable ranges. Therefore, the evaluation unit 207 of the judgment device 200 displayed alerts A1, A5, A7, and A9 as text information on the display unit 300 in accordance with the judgment results.

[0051] [Golfer C] Fig. 16(A) shows measurement data of the angular velocity ωx of the golf swing of golfer C, and Fig. 16(B) shows measurement data of the angular velocity ωy of the golf swing of golfer C. In Fig. 16(A) and (B), graph α is the golf swing to be judged, and graph β is measurement data of a model golf swing measured in the past by golfer C. From these graphs β, reference swing indicators for each of golfer C's first to sixth swing indicators are determined.

[0052] 17A to 17F are graphs showing the first to sixth swing indicators of the golf swing of golfer C. As is clear from Fig. 17, the third swing indicator, fourth swing indicator, fifth swing indicator, and sixth swing indicator of the golf swing to be judged of golfer C were outside the allowable ranges. Therefore, the evaluation unit 207 of the judgment device 200 displayed alerts A5, A7, A9, and A12 as text information on the display unit 300 in accordance with the judgment results.

[0053] [Golfer D] Fig. 18(A) shows measurement data of the angular velocity ωx of the golf swing of golfer D, and Fig. 18(B) shows measurement data of the angular velocity ωy of the golf swing of golfer D. In Figs. 18(A) and (B), graph α is the golf swing to be judged, and graph β is measurement data of a model golf swing measured in the past by golfer D. From these graphs β, reference swing indicators for each of golfer D's first to sixth swing indicators are determined.

[0054] 19A to 19F are graphs showing the first to sixth swing indicators of the golf swing of golfer D. As is clear from Fig. 19, the first swing indicator, the third swing indicator, the fourth swing indicator, and the fifth swing indicator of the golf swing to be judged of golfer D were outside the allowable ranges. The evaluation unit 207 of the judgment device 200 displayed alerts A1, A5, A7, and A9 as text information on the display unit 300 in accordance with the judgment results.

[0055] Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above specific disclosure, and can be implemented in various modified forms within the scope of the technical idea described in the claims.

[0056] [Additional Notes] The present invention includes the following aspects.

[0057] [Present Invention 1] A golf swing judgment device comprising: an acquisition unit that acquires measurement data from a swing sensor when a target golfer performs a swing motion using a golf club equipped with the swing sensor, an extraction unit that extracts a take-back section of the swing motion from the measurement data, a calculation unit that calculates at least one swing index that quantifies a predetermined motion from the measurement data of the take-back section, and an evaluation unit that evaluates the swing motion based on the swing index, wherein the at least one swing index includes an index calculated based on an angular velocity ωx about an x-axis that is orthogonal to an axis of a golf club shaft of the golf club and extends in a direction from the heel to the toe of the golf club head, and / or an angular velocity ωy about a y-axis that is orthogonal to the axis of the shaft and extends in the direction of a target ball flight line. [Present Invention 2] The golf swing judgment device according to Present Invention 1, wherein the swing index is an index calculated from one or more past swing motions of the target golfer. [Invention 3] The golf swing judgment device according to Invention 1 or 2, wherein the evaluation unit includes a comparison unit that outputs a comparison result between the swing index and a predetermined reference swing index. [Invention 4] The golf swing judgment device according to Invention 3, wherein the evaluation unit includes an alert display unit that displays an alert on a display unit when the comparison result exceeds a predetermined tolerance range. [Invention 5] The golf swing judgment device according to any of Inventions 1 to 4, wherein, when the counterclockwise direction of the angular velocity ωx about the x-axis when the target golfer's address is viewed from the front is taken as positive, the swing index includes a first swing index that is a time t1 from the start of the swing to when the angular velocity ωx reaches its maximum negative value. [Invention 6] The golf swing judgment device according to any of Inventions 1 to 5, wherein, when the counterclockwise direction of the angular velocity ωx about the x-axis when the target golfer's address is viewed from the front is taken as positive, the swing index includes a second swing index that is an integral of the angular velocity ωx over a section from the start of the swing to when the angular velocity ωx reaches its maximum negative value.[Invention 7] The golf swing judgment device according to any one of Inventions 1 to 6, wherein, when the counterclockwise direction of the angular velocity ωy about the y-axis when the address of the target golfer is viewed from in front of the direction of the target ball flight line is taken as positive, the swing indicator includes a third swing indicator which is the time t2 from the start of the swing to when the angular velocity ωy reaches its maximum positive value. [Invention 8] The golf swing judgment device according to any one of Inventions 1 to 7, wherein, when the counterclockwise direction of the angular velocity ωy about the y-axis when the address of the target golfer is viewed from in front of the direction of the target ball flight line is taken as positive, the swing indicator includes a fourth swing indicator which is the integral of the angular velocity ωy from the start of the swing during a section in which the angular velocity ωy takes a positive value. [Invention 9] The golf swing judgment device according to any one of Inventions 1 to 8, wherein, when the counterclockwise direction of the angular velocity ωy about the y-axis when the address of the target golfer is viewed from in front of the direction of the target ball flight line is taken as positive, the swing indicator includes a fifth swing indicator which is the time t3 from the start of the swing to when the angular velocity ωy reaches its maximum negative value. [Invention 10] The golf swing judgment device according to any one of Inventions 1 to 9, wherein, when the counterclockwise direction of the angular velocity ωy about the y-axis when the address of the target golfer is viewed from in front of the direction of the target ball flight line is taken as positive, the swing indicator includes a sixth swing indicator which is the integral of the angular velocity ωy in an interval where the angular velocity ωy takes a negative value.[Invention 11] A method for judging a golf swing, comprising the steps of: acquiring measurement data from a swing sensor attached to a golf club when a target golfer performs a swing motion using the swing sensor; extracting a take-back section of the swing motion from the measurement data; calculating at least one swing index that quantifies a predetermined motion from the measurement data of the take-back section; and evaluating the swing motion based on the swing index, wherein the at least one swing index includes an index calculated based on an angular velocity ωx about an x-axis that is perpendicular to an axis of a golf club shaft of the golf club and extends in a direction from the heel to the toe of the golf club head, and / or an angular velocity ωy about a y-axis that is perpendicular to the axis of the shaft and extends in the direction of a target ball flight line. [Invention 12] A golf swing judgment program that causes a computer to execute the following steps: acquiring measurement data from a swing sensor attached to a golf club when a target golfer performs a swing motion using the golf club; extracting a take-back section of the swing motion from the measurement data; calculating at least one swing index that quantifies a predetermined motion from the measurement data of the take-back section; and evaluating the swing motion based on the swing index, wherein the at least one swing index includes an index calculated based on an angular velocity ωx about an x-axis that is perpendicular to an axis of a golf club shaft of the golf club and extends in a direction from the heel to the toe of the golf club head, and / or an angular velocity ωy about a y-axis that is perpendicular to the axis of the shaft and extends in a direction of a target ball flight line.[Invention 13] A recording medium having recorded thereon a program for causing a computer to execute the following steps: acquiring measurement data from a swing sensor when a target golfer performs a swing motion using a golf club equipped with the swing sensor; extracting a take-back section of the swing motion from the measurement data; calculating at least one swing index that quantifies a predetermined motion from the measurement data of the take-back section; and evaluating the swing motion based on the swing index, wherein the at least one swing index includes an index calculated based on an angular velocity ωx about an x-axis that is perpendicular to an axis of a golf club shaft of the golf club and extends in a direction from the heel to the toe of the golf club head, and / or an angular velocity ωy about a y-axis that is perpendicular to the axis of the shaft and extends in a direction of a target ball flight line.

[0058] 2 Golf club 3 Golfer 22 Golf club shaft 23 Golf club head 100 Swing sensor 200 Determination device 204 Acquisition unit 205 Extraction unit 206 Calculation unit 207 Evaluation unit 207A Comparison unit 207B Alert display unit 300 Display unit

Claims

1. A golf swing judgment device comprising: an acquisition unit that acquires measurement data from a swing sensor when a target golfer performs a swing motion using a golf club equipped with the swing sensor; an extraction unit that extracts a take-back section of the swing motion from the measurement data; a calculation unit that calculates at least one swing index that quantifies a predetermined motion from the measurement data of the take-back section; and an evaluation unit that evaluates the swing motion based on the swing index, wherein the at least one swing index includes an index calculated based on an angular velocity ωx about an x-axis that is perpendicular to the axis of a golf club shaft of the golf club and extends in a direction from the heel to the toe of the golf club head, and / or an angular velocity ωy about a y-axis that is perpendicular to the axis of the shaft and extends in the direction of a target ball flight line.

2. The golf swing judgment device according to claim 1, wherein the swing index is an index calculated from one or more swing motions measured in the past of the target golfer.

3. The golf swing judgment device according to claim 1, wherein the evaluation unit includes a comparison unit that outputs a result of comparison between the swing index and a predetermined reference swing index.

4. The golf swing judgment device according to claim 3, wherein the evaluation unit includes an alert display unit that displays an alert on a display unit when the comparison result exceeds a predetermined tolerance range.

5. A golf swing judgment device as claimed in any one of claims 1 to 4, wherein the swing indicators include a first swing indicator which is the time t1 from the start of the swing to when the negative value of the angular velocity ωx reaches its maximum, when the counterclockwise direction of the angular velocity ωx around the x-axis when the target golfer's address is viewed from the front is taken as positive.

6. A golf swing judgment device according to any one of claims 1 to 4, wherein, when the counterclockwise direction of the angular velocity ωx around the x-axis when the target golfer's address is viewed from the front is taken as positive, the swing indicator includes a second swing indicator which is the integral value of the angular velocity ωx in the section from the start of the swing to when the negative value of the angular velocity ωx becomes maximum.

7. A golf swing judgment device as claimed in any one of claims 1 to 4, wherein the swing indicators include a third swing indicator which is the time t2 from the start of the swing to when the positive value of the angular velocity ωy reaches its maximum, when the counterclockwise direction of the angular velocity ωy around the y-axis when the address of the subject golfer is viewed from in front of the direction of the target ball flight line is taken as positive.

8. A golf swing judgment device as claimed in any one of claims 1 to 4, wherein, when the counterclockwise direction of the angular velocity ωy around the y-axis when the address of the subject golfer is viewed from in front of the direction of the target ball flight line is taken as positive, the swing indicator includes a fourth swing indicator which is the integral value of the angular velocity ωy from the start of the swing during a section in which the angular velocity ωy is positive.

9. A golf swing judgment device as claimed in any one of claims 1 to 4, wherein the swing indicators include a fifth swing indicator t3 which is the time t3 from the start of the swing to when the negative value of the angular velocity ωy reaches its maximum, when the counterclockwise direction of the angular velocity ωy around the y-axis when the address of the subject golfer is viewed from in front of the direction of the target ball flight line is taken as positive.

10. A golf swing judgment device as claimed in any one of claims 1 to 4, wherein when the counterclockwise direction of the angular velocity ωy around the y-axis when the address of the subject golfer is viewed from in front of the direction of the target ball flight line is taken as positive, the swing indicator includes a sixth swing indicator which is the integral value of the angular velocity ωy in an interval where the angular velocity ωy is negative.

11. A method for judging a golf swing, comprising the steps of: acquiring measurement data from a swing sensor attached to a golf club when a target golfer performs a swing motion using the golf club; extracting a take-back section of the swing motion from the measurement data; calculating at least one swing index that quantifies a predetermined motion from the measurement data of the take-back section; and evaluating the swing motion based on the swing index, wherein the at least one swing index includes an index calculated based on an angular velocity ωx about an x-axis that is perpendicular to the axis of a golf club shaft of the golf club and extends in a direction from the heel to the toe of the golf club head, and / or an angular velocity ωy about a y-axis that is perpendicular to the axis of the shaft and extends in the direction of a target ball flight line.

12. A golf swing judgment program that causes a computer to execute the following steps: acquiring measurement data from a swing sensor attached to a golf club when a target golfer performs a swing motion using the golf club; extracting a take-back section of the swing motion from the measurement data; calculating at least one swing index that quantifies a predetermined motion from the measurement data of the take-back section; and evaluating the swing motion based on the swing index, wherein the at least one swing index includes an index calculated based on an angular velocity ωx about an x-axis that is perpendicular to the axis of a golf club shaft of the golf club and extends in a direction from the heel to the toe of the golf club head, and / or an angular velocity ωy about a y-axis that is perpendicular to the axis of the shaft and extends in the direction of a target ball flight line.

13. A recording medium having recorded thereon a program for causing a computer to execute the following steps: acquiring measurement data from a swing sensor attached to a golf club when a target golfer performs a swing motion using the golf club; extracting a take-back section of the swing motion from the measurement data; calculating at least one swing index that quantifies a predetermined motion from the measurement data of the take-back section; and evaluating the swing motion based on the swing index, wherein the at least one swing index includes an index calculated based on an angular velocity ωx about an x-axis that is perpendicular to the axis of a golf club shaft of the golf club and extends in a direction from the heel to the toe of the golf club head, and / or an angular velocity ωy about a y-axis that is perpendicular to the axis of the shaft and extends in a direction of a target ball flight line.

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