JP2006255303A - Device for detecting head advance degree in golf club shaft, device for detecting toe-down degree in golf club shaft, and device for detecting flex speed - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shaft behavior measuring instrument capable of correctly and simply evaluating the degree of "front bending angle", "toe-down amount", or "flex speed" in swinging of each golfer. <P>SOLUTION: The shaft behavior measuring instrument comprises: a strain measurement unit 100 for measuring the strain of a prescribed position in a shaft when the golfer swings; a storage part 300 for storing a table 200 indicating relation between a strain amount around an impact in the swing of the golfer and the largeness (higher or lower) of different parameters concerning the shaft behavior; an evaluation unit 400 for evaluating the largeness (higher or lower) of the parameters step by step, based on the measurement result by the strain measurement unit 100; and a display device 500 for displaying the evaluation result by the evaluation unit 400. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a golf club shaft head advance detection device (front warpage analyzer), a golf club shaft toe down detection device (toe down analyzer), and a deflection speed detection device (deflection velocity analyzer). Pre-warp analyzer that evaluates the degree of deflection angle in the swing direction of the shaft before impact stepwise, Toe-down analyzer that evaluates the degree of toe-down amount during the swing stepwise, and the head speed due to the deflection of the shaft during the swing The present invention relates to a bending speed analyzer that evaluates the degree in stages.

  Golf clubs come in a variety of shaft flex and tone (FLEX POINTs), and golfers need to select a golf club with the flex and tone that suits them.

  An example of a golf club shaft selection system focusing on shaft flex (EI: flexural rigidity) is described in Japanese Patent No. 3061640. Here, it is possible to measure any of the golfer's swing time, swing speed (club head speed), club head acceleration and shaft distortion, or to measure the above measurement items and head speed. It is disclosed.

  Moreover, as a golf club shaft selection system paying attention to the bending rigidity distribution (EI distribution) of a shaft, what was described in Unexamined-Japanese-Patent No. 2004-129687 is mentioned. Here, the shaft behavior measuring means for measuring the deformation behavior of the shaft during the swing, the shaft EI calculation means for calculating the EI distribution of the shaft, and the shaft shape calculation means for calculating the deformation shape of the shaft during the swing are provided. 1 analysis system and a second analysis system having a swing classification means for analyzing and classifying a golfer's swing, analyzing the deformation behavior of the shaft during the swing, classifying the golfer's swing, and It is disclosed to select an optimum shaft.

  Moreover, as a golf club shaft selection system paying attention to the torsional rigidity (torque) of a shaft, what was described in Unexamined-Japanese-Patent No. 2001-70482 etc. is mentioned. Here, it is disclosed that the amount of distortion of the shaft during the swing of each golfer is measured or the head speed is measured simultaneously with the amount of distortion.

  Other examples of the method for measuring torsional strain include those described in JP-A-2003-205053. Here, it is disclosed that torsional distortion generated in a shaft during a swing of a golf club is measured, and dynamic evaluation of the shaft including the torsional behavior of the shaft is performed based on time history data of the measured torsional distortion.

  Moreover, as a golf club shaft selection system which paid attention to the amount of toe down at the time of a swing, what was described in Unexamined-Japanese-Patent No. 2003-284802 etc. is mentioned. Here, the bending moment distribution applied to the shaft when the sample golf club is swung is measured, and from the measured data and the bending rigidity distribution of the shaft, the shaft head in the direction in which the toe side of the club head is lowered immediately before the impact is measured. There is disclosed a method of calculating five elements including a “toe down amount” that is a deflection amount, and selecting a shaft that is more appropriate or optimal for a golfer based on the calculation result.

Another example of the method for measuring the “toe down amount” is that described in Japanese Patent No. 3549334. Here, it is disclosed that a television camera or optical detection means is used when measuring the toe down amount of a golf club.
Japanese Patent No. 3061640 JP 2004-129687 A JP 2001-70482 A JP 2003-205053 A JP 2003-284802 A Japanese Patent No. 3549334

  However, even when a golf club shaft is selected by making full use of the system as described above, a shaft selection criterion that is sufficiently satisfactory for some golfers may not be obtained.

  On the other hand, the inventors of the present application proceeded with investigation, and it was found that the “front warp angle”, “Droop amount” or “deflection speed” at the time of swing of each golfer affects the position of the hitting point. I understood. Therefore, if these parameters are evaluated step by step for each golfer and the degree thereof can be accurately grasped, it is considered that an appropriate golf club shaft can be selected for each golfer.

  In Patent Documents 1 to 6, the degree of “front warp angle”, “toe down amount” or “deflection speed” at the time of swing of each golfer is evaluated step by step based on a reference value prepared in advance. The idea is not disclosed.

  The present invention has been made in view of the above problems, and an object of the present invention is to accurately determine the degree of “front warp angle”, “toe down amount”, or “deflection speed” during swing of each golfer. It is an object of the present invention to provide a warp analyzer, a toe down analyzer, and a deflection velocity analyzer that can be easily and easily evaluated.

  A golf club shaft head leading degree detection device (front warp analyzer) according to the present invention includes a strain measuring means for measuring a strain amount at a predetermined position on a shaft during a golfer's swing, and a strain amount near an impact in a golfer's swing. Based on the measurement result by the strain measurement means while referring to the table stored in the storage means and the table stored in the storage means showing the relationship between the degree of the front warp angle which is the deflection angle in the swing direction of the shaft And an evaluation means for stepwise evaluating the degree of the forward warp angle and a display means for displaying an evaluation result by the evaluation means.

  According to the above configuration, it is possible to accurately and easily evaluate the degree of the “front warp angle” when each golfer swings.

  Here, “front warp” means the deflection of the shaft in the swing direction immediately before impact. That is, the “front warp angle” is an index indicating how much the head side end portion of the golf club shaft precedes the grip side end portion immediately before impact. When the head side end of the shaft is positioned on the rear side with respect to the grip side end immediately before the impact, the “front warp angle” indicates a negative value.

  A golf club shaft toe down degree detecting device (toe down analyzer) according to the present invention includes a strain measuring means for measuring a strain amount at a predetermined position on a shaft during a golfer's swing, and a strain amount and a toedown in the vicinity of the golfer's swing. Evaluation that evaluates the degree of toe down step by step based on the measurement result by the strain measurement means while referring to the table stored in the storage means and the storage means for storing the table showing the relationship with the amount degree Means and display means for displaying an evaluation result by the evaluation means.

  According to the above configuration, the degree of “toe down amount” at the time of swing of each golfer can be accurately and easily evaluated.

  Here, “toe down” means a phenomenon in which the toe side portion of the club head is drawn toward the heel immediately before impact, and the club shaft bends in that direction.

  A deflection speed detection device (flexure speed analyzer) according to the present invention includes a strain measurement unit that measures a strain amount at a predetermined position on a shaft during a golfer's swing, and a strain per unit time based on a measurement result by the strain measurement unit. A strain change amount calculating means for calculating a change amount; a storage means for storing a table showing a relationship between a strain change amount near an impact in a golfer's swing and a degree of a deflection speed which is a head speed due to the deflection of the shaft; While referring to the table stored in the storage means, based on the calculation result by the strain change amount calculation means, the evaluation means for stepwise evaluating the degree of the bending speed, and the display means for displaying the evaluation result by the evaluation means Prepare.

  According to the above configuration, the degree of “deflection speed” at the time of swing of each golfer can be accurately and easily evaluated.

  The “bending speed” here is a head speed added by the deflection of the shaft immediately before impact, and is a part of the head speed measured immediately before impact. In general, the head speed can be separated into a speed component caused by a golfer's swing and a speed component added when the shaft is bent during the swing.

  According to the present invention, the degree of “front warping angle”, “toe down amount”, or “deflection speed” at the time of swing of each golfer can be accurately and easily evaluated. As a result, an appropriate golf club shaft can be selected.

  Hereinafter, embodiments of a warp analyzer, a toe down analyzer, and a deflection rate analyzer as a shaft behavior measuring apparatus according to the present invention will be described.

  The shaft behavior measuring apparatus according to the present embodiment includes a strain measuring unit 100 that measures the amount of strain at a predetermined position on the shaft during a golfer's swing, and various parameters relating to the amount of strain near the impact and shaft behavior in the golfer's swing. Based on the measurement result by the strain measurement unit 100, referring to the storage unit 300 that stores the table 200 indicating the relationship between the magnitude of the size and the level (high and low), and the table 200 stored in the storage unit 300. The evaluation unit 400 that evaluates the degree of magnitude (high and low) in stages, and the display device 500 that displays the evaluation result by the evaluation unit 400 are provided. The strain measurement unit 100 is included in the swing analysis apparatus 1 described later.

  As an example, the table 200 stores the relationship between the amount of distortion and the degree of “front warp angle”. In this case, the shaft behavior measuring device becomes a “front warp analyzer” that evaluates the degree of front warp step by step.

  As another example, the table 200 stores the relationship between the distortion amount and the degree of “toe down amount”. In this case, the shaft behavior measuring device becomes a “toe down analyzer” that evaluates the degree of toe down step by step.

  As yet another example, the table 200 stores the relationship between the amount of distortion and the degree of “deflection speed (head speed added by bending of the club shaft 3)”. In this case, the shaft behavior measuring device is a “deflection velocity analyzer” that evaluates the degree of the deflection velocity step by step.

  The storage unit 300 that stores the table 200 is, for example, a hard disk in a computer, and the evaluation unit 400 includes, for example, a CPU in the computer. The display device 500 connected to the evaluation unit 400 may be a display device or a printer device.

  Information from the strain measurement unit 100 is input to the evaluation unit 400. The evaluation unit 400 evaluates the measurement result by the strain measurement unit 100 step by step (for example, 10 steps) while referring to the table 200. The evaluation result is displayed on the display device 500.

  FIG. 2 is a block diagram showing the configuration of the swing analysis apparatus that constitutes the strain measurement unit 100 shown in FIG. Referring to FIG. 2, swing analysis apparatus 1 analyzes a swing when hitting ball 4 with golf club 2 having club shaft 3. The swing analysis apparatus 1 includes a strain gauge 1A, a bridge 1B, and an amplifier 1C.

  FIG. 3 is an axial sectional view of the club shaft 3 to which the strain gauge 1A is attached. Referring to FIG. 3, the strain gauge 1 </ b> A is attached to the side surface of the club shaft 3 in the flying ball direction (x-axis direction) and / or the side surface in the direction orthogonal to the flying ball direction (y-axis direction). The “front warp angle” is detected from the amount of distortion in the x-axis direction. Further, the “toe down amount” is detected from the distortion amount in the y-axis direction. Then, the “deflection speed” of the club head is detected from the amount of change per unit time in the amount of strain in the x-axis direction (hereinafter sometimes referred to as strain change amount). Note that the distortion change amount is calculated by a distortion change amount calculation unit 410 (FIG. 1) provided in the evaluation unit 400. Further, by combining the amount of strain in the x-axis direction and the amount of strain in the y-axis direction, it is possible to detect the amount of club shaft deflection in any direction.

  The strain gauge 1A is provided at a position away from the club head side end of the club shaft 3 by a predetermined distance (L: for example, about 600 mm to 860 mm). The strain gauge 1A is connected to an evaluation unit 400, which is a computer, via a bridge 1B and an amplifier 1C. The detection of the impact time is performed based on the change over time in the distortion amount of the club shaft measured by the strain gauge 1A and input to the evaluation unit 400 via the bridge 1B and the amplifier 1C. Specifically, the time when the amount of distortion of the club shaft suddenly changes to a predetermined threshold value or more (the time-varying curve begins to be disturbed) is detected as the impact time. With the above configuration, the amount of distortion of the club shaft 3 during the swing is detected. The evaluation unit 400 refers to the table 200 stored in the storage unit 300, and based on the magnitude of the distortion amount and the magnitude of the distortion change amount, the “front warp angle”, “toe down amount”, and “deflection speed” at the time of impact. Is evaluated in stages. The evaluation result by the evaluation unit 400 is displayed on the display device 500.

  FIG. 4 is a block diagram showing the configuration of the swing analysis apparatus 1 in more detail. Referring to FIG. 4, swing analysis apparatus 1 further includes an A / D converter 1F, a data latch 1G, and a reset switch 1H. The output of the strain gauge 1A is amplified by the amplifier 1C, then applied to the A / D converter 1F, converted into a digital signal, and latched in the data latch 1G. The data given to the data latch 1G is sent to the evaluation unit 400. The data latched in the data latch 1G is reset by operating the reset switch 1H.

  Next, the operation of the shaft behavior measuring device will be described. First, the power switch of the shaft behavior measuring device is operated to turn on the power of the device. Then, it is confirmed whether the display device 500 displays “0” (initial value). If “0” is not displayed, the reset switch 1H is operated to reset the data latch 1G. Then, the golf club 2 is swung. At this time, the strain gauge 1A outputs a voltage corresponding to the amount of strain of the club shaft 3 accompanying the swing, the voltage is amplified by the amplifier 1C, and the analog signal is converted into a digital signal by the A / D converter 1F. The The digital signal is latched in the data latch 1G. The latched data is evaluated step by step by the evaluation unit 400, and the evaluation result is displayed on the display device 500. When swinging again, the reset switch 1H is operated to reset the data in the data latch 1G. When the swing analysis is finished, the shaft behavior measuring device is turned off.

  FIG. 5 is a flowchart showing evaluation and display operations in the shaft behavior measuring apparatus. When the strain amount is detected by the strain gauge 1A and the data is latched in the data latch 1G, it is determined whether or not the value exceeds a preset setting value 9 (set value of rank “9”) in the table 200. If the value 9 is exceeded, “9” is displayed on the display device 500, and if it does not exceed the set value 9, it is determined whether the set value 8 has been exceeded. If the data exceeds the set value 8, “8” is displayed on the display device 500. If the data does not exceed the set value 8, it is determined whether the set value 7 has been exceeded. By repeating this step, the level of the data latched in the data latch 1G is evaluated, and the evaluation result is displayed as “9”, “8”,... “2”, “1”. . In this embodiment, the data is evaluated in 10 stages, but the number of stages can be changed as appropriate.

  Next, the significance of stepwise evaluation of the “front warp angle”, “toe down amount”, and “deflection speed” will be described.

  13 to 15 are diagrams for explaining the “front warp” phenomenon. 13 to 15, the golf club is swung in the direction of the arrow DR0, the club shaft moves from the first position 3A toward the second position 3B, and when the shaft reaches the third position 3C, the ball 4 Is hit. FIG. 13 to FIG. 15 show examples of a small (minus) swing (FIG. 13), a proper swing (FIG. 14), and a large swing (FIG. 15) with a forward warping angle (θ). 13 to 15, the balls 4 jump out in the directions of arrows DR1, DR2, DR3, respectively. FIG. 13 shows an example of a swing in which the club head is delayed. In such a case, a “heel hit point” is likely to occur, the ball muscle is low, and (in the case of a right-handed golfer), there is a tendency that the right hit ball is increased. FIG. 14 shows an example of a swing slightly preceded by a head. Such swings are common in advanced and skilled people. FIG. 15 shows an example of a swing in which the club head seems to be ahead. In such a case, the launch angle tends to be large and the ball muscle tends to be high. Further, “toe hitting points” are likely to occur, and (in the case of a right-handed golfer), the number of hitting balls that seem to “hook” in the left direction increases. Or, by “cutting”, the number of balls hit in the right direction increases (in the case of a right-handed golfer).

  Further, when the “toe down amount” is excessive, the influence on the lie angle of the golf club at the time of impact becomes large, and the influence on the directionality of the hit ball also becomes large.

  If the “deflection speed” is within an appropriate range, the head speed can be increased to improve the flight distance. However, if the “deflection speed” is excessive, the directionality of the hit ball is increased. It may become unstable.

  The “front warp angle”, “toe down amount”, and “deflection speed” vary according to the swing characteristics of each golfer. Furthermore, the degree of “front warping”, “toe down”, and “deflection speed” are related to phenomena such as “toe hitting point”, “heel hitting point”, and “variation of hitting point” that plague golfers.

  Here, “toe hitting point” means a tendency for the hitting position to be biased toward the toe side of the club head, and “heel hitting point” means a tendency for the hitting position to be biased toward the heel side of the club head. Further, “variation in hitting points” means that the hitting position is not stable.

  Regarding “front warp”, for example, a golfer who is troubled by “toe hitting point” may cause the following phenomena (A1) and (A2).

  (A1) A golfer with a fast wrist turn that returns the wrist before and after impact (generally, a swing that is said to have a “left wall”) moves to the front side of the club head of the club shaft just before the impact. Tend to swing with a large deflection (i.e., large "front warp"), the club head is likely to return, and (for right-handed golfers) the trajectory tends to go to the left.

  (A2) A golfer with a slow wrist-turn swing that does not return the wrist before and after impact, but a swing that moves the right hand to raise the ball (generally a swing that is said to “knead” or “suck up” the wrist / hand) Tends to be a swing with a large deflection of the club shaft toward the leading side of the club head just before impact (ie, “front warp” is large), and the club head tends to return, and (for right-handed golfers) the trajectory It becomes easier to go to the left.

  In the case of a golfer who is troubled by “heel hitting point”, the following phenomena (A3) and (A4) may occur.

  (A3) A golfer with a slow wrist turn that does not return his wrist before and after impact, and a swing in which the golfer's right hand sneaks in at impact (generally, a swing said that the right hand is down) The club shaft just before impact has a large deflection toward the leading side of the club head (ie, “front warping” is large), but the club head is difficult to return, and the trajectory (for right-handed golfers) Easy to go right and high trajectory.

(A4) A golfer with a slow swing with a wrist turn that does not return the wrist before and after impact (generally a swing that is said not to have a “left wall”)
The club shaft just before the impact tends to swing with the club head leading to the leading side of the club head (ie, the “front warp” is small), and in some cases the club head flexes toward the side retracting from the shaft. Because it greets, the club head is difficult to return, and (in the case of a right-handed golfer) the trajectory is easy to go to the right and has a low trajectory.

  Which of the above four types (A1 to A4) each golfer suffering from “toe hitting point” and “heel hitting point” can be roughly estimated by an interview or the like. However, it becomes easier to grasp the clues for eliminating the “toe hit points” and “heel hit points” by specifically grasping how strong the tendency of each golfer belongs to the above types (A1 to A4).

  On the other hand, according to the above-mentioned “front warp analyzer”, the degree of “front warp” of each golfer can be evaluated in stages, so that each golfer tends to belong to the type (A1 to A4). It becomes possible to grasp concretely how strong is. As a result, clues for eliminating the “toe hitting point” and “heel hitting point” can be obtained, the hitting point position can be brought to the center, the meet rate can be increased, and the flight distance can be increased.

  Regarding “toe down”, for example, a golfer suffering from “toe hitting point” may experience the following phenomenon (B1).

  (B1) Shaft deflection during “turn-back” or “cock release” is large, grip passes relatively close to golfer at impact, grips firmly at impact (strong grip), does not use wrist turn, etc. In a swing golfer in which these factors are intertwined, the toe side of the club head is drawn toward the heel side (golfer side) immediately before impact, and the shaft tends to bend in that direction. As a result, it tends to be a “tow hitting point”. Or, “variation of hit points” increases.

  In addition, in the case of a golfer who is troubled by “heel hitting point”, the following phenomenon (B2) may occur.

  (B2) Shaft deflection during "turn-back" or "cock release" is small, grip passes relatively away from golfer during impact, grip is not firmly gripped during impact (grip strength is not strong), wrist A golfer with a swing that uses a turn or a wrist turn that is not often used but has a large forward warp, the toe side of the club head is not attracted to the heel side (golfer side) immediately before impact, and the shaft There is a tendency not to do much in the direction. As a result, it tends to be a “heel hit point”. In addition, the club head is difficult to return, and (in the case of a right-handed golfer) the trajectory tends to go to the right and has a low trajectory.

  Which of the above two types (B1, B2) each golfer suffering from “toe hitting point” and “heel hitting point” can be roughly estimated by an interview or the like. However, it becomes easier to grasp the clues for eliminating the “toe hit points” and “heel hit points” by specifically grasping how strong each golfer has a tendency to belong to the type (B1, B2).

  On the other hand, according to the above-mentioned “toe down analyzer”, the degree of “toe down” of each golfer can be evaluated in stages, so which golfer has a tendency to belong to the type (B1, B2). It becomes possible to grasp specifically whether it is strong enough. As a result, clues for eliminating the “toe hitting point” and “heel hitting point” can be obtained, the hitting point position can be brought to the center, the meet rate can be increased, and the flight distance can be increased.

  With regard to “deflection speed”, for example, for golfers suffering from “variation of hit points”, the following phenomena (C1) and (C2) may occur.

  (C1) Of the head speed, a golfer having a high proportion of club shaft deflection (that is, the deflection speed can be used effectively), although the shaft hardness is selected in accordance with the total head speed. In some cases, the amount of deflection of the shaft varies and the hit points vary.

  (C2) Of the head speeds, golfers with a low ratio of speed due to club shaft deflection (that is, do not use the deflection speed), despite selecting the shaft hardness according to the total head speed, The timing may not match and the hit points may vary.

  Which of the above two types (C1, C2) corresponds to each golfer who suffers from “variation of hit points” can be generally estimated by interviews or the like. However, by grasping specifically how strong each golfer tends to belong to the type (C1, C2), it becomes easy to grasp the clues to eliminate the “variation of hit points”.

  On the other hand, according to the above-mentioned “deflection speed analyzer”, the degree of “deflection speed” of each golfer can be evaluated step by step, so that each golfer tends to belong to the type (C1, C2). It becomes possible to grasp concretely how strong is. As a result, clues for eliminating the “variation of hit points” can be obtained, the hit point position can be brought to the center, the meet rate can be increased, and the flight distance can be increased.

  By the way, generally, a golfer with a fast head speed tends to have a fast wrist turn, and a golfer with a slow head speed tends to have a slow wrist turn. In this specification, “the wrist turn is fast / slow” means “the wrist turn is fast / slow for the head speed”. The speed of the wrist turn can be detected, for example, by attaching a rotation detection sensor to the golfer's hand during a swing.

  The causes of “toe hitting point”, “heel hitting point”, and “variation of hitting point” are shown in Table 1, Table 2, and Table 3, respectively.

  On the other hand, the correspondence to “toe hitting point”, “heel hitting point”, and “variation of hitting point” is shown in Table 4, Table 5, and Table 6, respectively.

  In Tables 4 to 6, “STD” and “STF” mean shaft tone (EI distribution) characteristics. “STD” means a shaft tone in which the entire club shaft including the grip portion is easily bent, and “STF” means a shaft tone in which the grip portion has a high bending rigidity.

  According to the shaft behavior measuring apparatus according to the present embodiment, the “front warp”, “toe down”, and “deflection speed” are quantitatively evaluated by a simple method, so that “toe hit point”, “heel hit point” and The club shaft suitable for the swing characteristics of each golfer can be selected by grasping the factor of “variation of hit points”.

  FIG. 6 is a diagram showing the outer diameter and bending stiffness distribution of a golf club used in the shaft behavior measuring method according to one embodiment of the present invention. The horizontal axis in FIG. 6 indicates the distance from the club head side end of the golf club shaft. In the example of FIG. 6, the outer diameter and bending rigidity of the golf club shaft increase from the club head side toward the grip side.

  FIG. 7 is a diagram showing the relationship between the bending moment acting on a predetermined position of the shaft (here, the vicinity of the grip portion of 600 mm, 740 mm, and 860 mm from the head side end portion) and the “front warp angle”. FIG. 8 is a diagram showing the relationship between the bending moment acting on the predetermined position and the “toe down amount”. FIG. 9 is a diagram showing the relationship between the bending moment change amount acting on the predetermined position and the “deflection speed”. Note that the “shaft tip deflection angle / deflection amount” for obtaining the “front warp angle”, “toe down amount”, and “deflection speed” shown in FIGS. 7 to 9 is, for example, the length direction of the club shaft. It is possible to detect by attaching strain gauges 1A at a plurality of positions (for example, four places) arranged in a row.

  Referring to FIGS. 7 to 9, “bending moment”, “front warping angle”, “toe down amount”, and “deflection speed” at a predetermined position are in a substantially linear relationship. Therefore, by measuring the amount of distortion of the club shaft at a predetermined position, it is possible to obtain the “front warp angle”, “toe down amount”, and “deflection speed”. In this embodiment, based on the amount of distortion of the club shaft at a position of 740 mm from the head side end of the club shaft, the “front warp angle”, “toe down amount”, and “deflection speed” are obtained. The degree is evaluated in stages.

  10 to 12 are diagrams showing distributions of “front warping angle”, “toe down amount”, and “deflection speed” measured for a plurality of intermediate to advanced golfers, respectively. Note that “N” in FIGS. 10 to 12 indicates a normal distribution curve.

  Referring to FIG. 10, the average value of “front warp angle” of intermediate to advanced golfers is about 2.0 °. If this value is excessively large, the spherical muscle tends to be high, and if it is too small, the spherical muscle tends to be low. Therefore, it is necessary to make the range suitable for the preference of the loft angle and hitting height of the club head.

  Referring to FIG. 11, the average value of “toe down amount” of intermediate to advanced golfers is about 60 mm to 70 mm. If this value is excessive, the direction of hitting ball will not be stable. Although the head speed at the time of impact also affects the magnitude of the “toe down amount”, the preferable range of the “toe down amount” is estimated to be approximately 60 mm or less (or approximately 70 mm or less).

  Referring to FIG. 12, the average value of “deflection speed” of intermediate to advanced golfers is about 2.5 m / s. If this value is too large, the direction of the ball will not be stable, and if it is too small, the head speed at impact will decrease. Therefore, the “deflection speed” is preferably about 1.5 m / s or more and 3.5 m / s or less, for example.

  Table 7 is a table showing the relationship between the amount of strain measured by the strain gauge 1A and the magnitude of each parameter (high and low) used in the warp analyzer, toe down analyzer, and deflection rate analyzer according to this example. Tables 8 and 9 show. Table 7 shows the relationship between the amount of distortion and the degree of “front warp” (evaluation result), Table 8 shows the relationship between the amount of distortion and the degree of “toe down” (evaluation result), and Table 9 shows the relationship between The relationship between the quantity and the degree of “bending speed” (evaluation result) is shown.

  Referring to Tables 7 to 9, in the front warp analyzer, for example, if the strain amount is α3 to α4, “3” is displayed as the degree of “front warp”, and in the toe down analyzer, for example, the strain amount Is β4 to β5, “4” is displayed as the degree of “toe down”. In the bending speed analyzer, for example, when the strain amount is γ5 to γ6, the degree of “flexing speed” is “5”. Is displayed.

  As described above, the degree of “front warp”, “toe down”, and “deflection speed” varies depending on the swing characteristics (癖) of each golfer, and “toe hit point”, “heel hit point”, and “variation of hit points” Cause. Therefore, when the degree of “front warp”, “toe down”, and “deflection speed” is excessive / excessive, “toe hit point” and “heel hit point” are appropriately changed by changing the characteristics of the club shaft and club head. In addition, it is possible to suppress “variation of hit points”. For example, if the “deflection speed” is evaluated as excessive by the bending speed analyzer, the club shaft is hardened (flex is increased). Thereby, the “deflection speed” is suppressed, and “variation in hitting points” can be suppressed.

  Although the embodiments and examples of the present invention have been described above, the embodiments and examples 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, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is the block diagram which showed the structure of the shaft behavior measuring apparatus which concerns on one embodiment of this invention. It is the block diagram which showed the structure of the swing analyzer which comprises the distortion measurement unit shown by FIG. FIG. 3 is an axial sectional view of the golf club shaft shown in FIG. 2. It is the block diagram which showed the structure of the shaft behavior measuring apparatus shown by FIG. 1 in detail. It is the flowchart which showed the evaluation and display operation | movement in the shaft behavior measuring apparatus shown by FIG. It is the figure which showed the outer diameter and bending rigidity distribution of the golf club used for the shaft behavior measuring method which concerns on one Example of this invention. It is a figure which shows the relationship between the bending moment which acts on the predetermined position of a shaft, and a "front curvature angle". It is a figure which shows the relationship between the bending moment which acts on the predetermined position of a shaft, and "toe down amount". It is a figure which shows the relationship between the bending moment variation | change_quantity which acts on the predetermined position of a shaft, and "bending speed". It is the figure which showed distribution of the "front curvature angle" measured about several golfers. It is the figure which showed distribution of the "toe down amount" measured about several golfers. It is the figure which showed distribution of the "bending speed" measured about the several golfer. FIG. 6 is a diagram (part 1) for explaining a “front warp” phenomenon; FIG. 6 is a diagram (part 2) for explaining the “front warp” phenomenon; FIG. 6 is a diagram (part 3) for explaining the “front warp” phenomenon;

Explanation of symbols

  1 swing analyzer, 1A strain gauge, 1B bridge, 1C amplifier, 1F A / D converter, 1G data latch, 1H reset switch, 2 golf club, 3 club shaft, 3A to 3C first to third positions, 4 balls, 100 strain measurement unit, 200 table, 300 storage unit, 400 evaluation unit, 410 strain change amount calculation unit, 500 display device.

Claims (3)

A strain measuring means for measuring a strain amount at a predetermined position on the shaft during the swing of the golfer;
Storage means for storing a table showing a relationship between the amount of distortion in the vicinity of an impact in the golfer's swing and a degree of a front warp angle which is a deflection angle in the swing direction of the shaft;
Referring to the table stored in the storage means, based on the measurement result by the distortion measurement means, evaluation means for stepwise evaluating the degree of the front warp angle;
An apparatus for detecting the degree of head advance of a golf club shaft, comprising: display means for displaying an evaluation result by the evaluation means. A strain measuring means for measuring a strain amount at a predetermined position on the shaft during the swing of the golfer;
Storage means for storing a table showing a relationship between the amount of distortion and the degree of toe down in the vicinity of the impact in the golfer's swing;
Referring to the table stored in the storage means, based on the measurement result by the distortion measurement means, evaluation means for stepwise evaluating the degree of the toe down amount;
A golf club shaft toe down degree detecting device comprising: display means for displaying an evaluation result by the evaluation means. A strain measuring means for measuring a strain amount at a predetermined position on the shaft during the swing of the golfer;
A strain change amount calculating means for calculating a strain change amount per unit time based on a measurement result by the strain measuring means;
Storage means for storing a table showing a relationship between the distortion change amount near the impact in the golfer's swing and the degree of the deflection speed which is the head speed due to the deflection of the shaft;
An evaluation means for stepwise evaluating the degree of the bending speed based on the calculation result by the distortion change amount calculation means while referring to the table stored in the storage means;
A bending speed detection apparatus comprising: display means for displaying an evaluation result by the evaluation means.

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