JP2008104726A - Golf swing evaluation method and golf swing evaluation apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To evaluate the feature of the golf swing of each golfer, especially the degree of setting hands ahead of a ball in an impact state, without using a large-scale apparatus. <P>SOLUTION: On a projection plane viewing from the side facing a golfer posing in a setup state, the golf club head of a golf club from the upper side of a horizontal plane, timings at which a plurality of measurement points set along the golf club shaft of a golf club respectively pass through a passing reference line preset on the projection plane are respectively detected. On the basis of the information of the passing timings of the respective measurement points detected in a passing timing detection step and the moving speed information of the golf club head in the impact state, an evaluation value indicating the posture of the golf club shaft in the impact state is calculated and output. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention analyzes the behavior of a golf club in a golf swing performed by holding the golf club, and the characteristics of the golf swing, in particular, the posture of the golf club shaft in an impact state, and thus the face surface of the golf club head in the impact state. The present invention relates to a method and apparatus for evaluating the degree of hand first in golf swing that affects the size of the loft angle of the golf swing.

  Conventionally, various methods and apparatuses for analyzing the behavior of a golf club in a golf swing performed by holding the golf club and evaluating the characteristics of the golf swing have been proposed. Among the behaviors of golf clubs in golf swing, the direction perpendicular to the ground and the angle of the golf club shaft in the impact state affect the loft angle of the golf club head at the time of impact, and the golf club hits the face surface. This greatly affects the launch angle of the golf ball, the amount of spin applied to the launched golf ball, and the trajectory of the launched golf ball. In addition, in such an impact state, the direction perpendicular to the ground and the angle of the golf club shaft well represent the degree of hand first in golf swing. It can be said that measuring the angle of the golf club shaft and the direction perpendicular to the ground in such an impact state is important in evaluating the golf swing.

  However, since the moving speed of the golf club shaft is remarkably high in the impact state, it is difficult to check the angle of such a golf club shaft with the naked eye or to shoot using a relatively inexpensive camera. For this reason, a general golfer could not know exactly how the direction perpendicular to the ground and the angle of the golf club shaft in his / her golf swing was, and thus how much the hand first was in the golf swing. .

Conventionally, various methods and apparatuses for measuring the angle of the golf club shaft and the direction perpendicular to the ground in such an impact state have been proposed. For example, Patent Document 1 below describes the behavior of a golf club shaft in a golf swing by using a magnetic sensor to acquire time-series three-dimensional position information and three-dimensional direction information of a golf club grip portion in the golf swing. A method and an apparatus for measuring are described. Patent Document 2 below discloses a method and apparatus that can acquire information such as the direction of the golf club shaft in the impact state by photographing the behavior of the golf club shaft in the impact state using a high-speed camera. Is described.
JP 2001-112903 A Japanese Patent Laid-Open No. 2005-218783

  However, the apparatus for measuring the angle of the golf club shaft and the direction perpendicular to the ground in the impact state described in the above cited references requires a very large apparatus, and the apparatus itself necessary for the evaluation The price of was high, and the cost for evaluation was relatively large. The present invention has been made in view of such problems, and simply and objectively measures the angle perpendicular to the ground and the angle of the golf club shaft in the impact state in the golf swing of each golfer. An object of the present invention is to provide a golf club evaluation method and apparatus capable of evaluating the characteristics of a golf swing.

  In order to solve the above problems, the present invention analyzes the behavior of the golf club in an impact state immediately before hitting a golf ball with respect to a golf swing performed by a golfer standing on a horizontal plane holding the golf club. A method for evaluating the characteristics of the golf swing, wherein a plurality of measurement points are set along the golf club shaft axis of the golf club on a projection plane viewed from the side facing the golfer in the address state. Each passing timing detection step for detecting the timing of passing through a preset passage reference line on the projection plane, and information on the passing timing of each of the measurement points detected in the passing timing detection step, Based on the moving speed information of the golf club in the impact state, An evaluation step for calculating and outputting an evaluation value representing the posture of the golf club shaft in a compact state, and the passing reference line is within a range through which the golf club shaft of the golf club passes in the impact state. A golf swing evaluation method is provided, wherein the golf swing evaluation method is set in a direction substantially perpendicular to the horizontal plane.

  The present invention also relates to a golf swing performed by a golfer standing on a horizontal plane by gripping the golf club, analyzing the behavior of the golf club in an impact state immediately before hitting a golf ball, and characteristics of the golf swing. Each of the plurality of measurement points set along the golf club shaft axis of the golf club on the projection plane viewed from the side facing the golfer holding in the address state. Passing timing detecting means for detecting the timing of passing through a preset passing reference line, information on the passing timing of each of the measurement points detected in the passing timing detecting step, and the golf in the impact state Based on the moving speed information of the club, the golf in the impact state Evaluation means for calculating and outputting an evaluation value representing the attitude of the club shaft, and the passing reference line is substantially the same as the horizontal plane within a range in which the golf club shaft of the golf club passes in the impact state. A golf swing evaluation device characterized in that it is set in a vertical direction is also provided.

  In this specification, the impact state in the golf swing refers to golf by a golf club from the installation position of the golf ball in the golf swing (including the virtual installation position when the golf ball is not actually installed). A state in which the golf club head is positioned in a direction opposite to the ball striking direction, for example, within a range of 200 mm or less. Further, the impact state in the golf swing is, for example, within 5.0 (ms) before and after, based on the moment of hitting, including the moment of hitting the golf ball with the golf club head in the golf swing to be evaluated. It may be a time range. That is, the range through which the golf club head passes in the impact state refers to the golf club head from the installation position of the golf ball in the golf swing (including the virtual installation position when the golf ball is not actually installed). It means a range within 200 mm, for example, in the direction opposite to the golf ball striking direction. Or, the range in which the golf club head is located within a time range within, for example, 5.0 (ms) before and after the moment of hitting, including the moment of hitting the golf ball with the golf club head. Say.

  The evaluation means includes a time difference between the passing timings of the plurality of measurement points passing through the passing reference line and a moving speed of the golf club in the impact state detected by the passing timing detecting means. By multiplying the information, a distance in the vertical direction between the plurality of measurement points when passing through the passage reference line is derived, and the derived vertical distance is calculated, It is preferable that an evaluation value representing the posture of the golf club shaft in the impact state is calculated and output using information on a distance along the golf club shaft axis between a plurality of measurement points.

Further, two measurement points are set along the golf club shaft axis of the golf club, and the distance in the vertical direction is F, and the golf club shaft axis between the two measurement points. When the magnitude of the distance along L is L, the evaluation means uses the angle between the length direction of the golf club shaft and the passage reference line when passing the passage reference line as the evaluation value. α is preferably derived using the following formula (1).
α = sin ⁻¹ (F / L) (1)

  In addition, a plurality of the passing reference lines are set in a range in which the golf club passes in the impact state, and the passing timing detecting unit passes each of the plurality of measurement points on each of the plurality of passing reference lines. And the evaluation means detects the time difference between the passage timings of each of the plurality of passage reference lines, one of the plurality of measurement points detected by the passage timing detection means, A moving speed of the one measurement point is derived based on a distance in parallel with the horizontal plane between the plurality of passage reference lines, and the derived moving speed of the one measurement point is determined as the golf in the impact state. It is preferable to calculate the evaluation value by using it as club moving speed information.

  Further, the golf swing is performed by holding a golf club provided with a reflective marker at each of the plurality of measurement points of the golf club shaft, and the passage timing detection means includes a light source for emitting projection light, By detecting the reflected light of the projection light in the measurement region from the projection unit that projects the projection light from the light source toward the measurement region corresponding to the passage reference line, and the plurality of reflection markers, It is preferable that each of the plurality of measurement points includes a line sensor that detects the timing of passing through the passage reference line.

  In addition, a plurality of the passing reference lines are set in a range in which the golf club passes in the impact state, and the projection unit of the passing timing detection unit faces each measurement region corresponding to each passing reference line. The projection light is projected, and the line sensor of the passage timing detection means detects the reflected light of the projection light in each of the plurality of different measurement regions, thereby providing a plurality of measurement points at each of the plurality of measurement points. And the evaluation means detects the passage of each of the plurality of passage reference lines, one of the plurality of measurement points detected by the passage timing detection means. Based on a time difference between timings to be performed and a distance in a direction parallel to the ground between the plurality of passage reference lines. Derives the moving speed of the fixed point, the moving speed of the derived the one measuring point, as the mobile speed information of the golf club in the impact state, it is preferable to calculate the evaluation value.

  Also. The reflective marker is a retroreflective reflector formed in a tape shape and affixed to the golf club shaft, and reflects the projection light on the reverse optical path from the light source to the passage reference line. It is preferable.

  The present invention detects, for each of a plurality of predetermined positions on the golf club, a passage timing of a passage reference line perpendicular to the ground where the golfer stands, and based on information on the passage timings of each of the plurality of such predetermined positions, The posture of the golf club shaft in the golf swing is derived. With the golf swing evaluation method and apparatus of the present invention, it is easy to determine the posture of the golf club shaft in each golf swing of an individual golfer, such as the degree of hand first in the golf swing, which a general golfer could not evaluate himself. In addition, objective evaluation can be made at low cost.

  A golf swing evaluation method and a golf swing evaluation device according to the present invention will be described in detail below. FIG. 1 is a configuration diagram showing an outline of an evaluation device 10 which is an example of a golf swing evaluation device of the present invention, and shows a state in which a golf swing performed by a golfer 12 is evaluated using the evaluation device 10. The evaluation device 10 analyzes the posture of the golf club 14 in an impact state with respect to the golf swing performed by the golfer 12 standing on the ground (horizontal plane) holding the golf club 14 and evaluates the degree of hand first in the golf swing. The evaluation apparatus 10 includes a swing measurement / data processing unit 20 (hereinafter simply referred to as a unit 20) and a computer 30.

  The golf club 14 gripped by the golfer 12 is, for example, within a range of a length of 1066 to 1219 mm (about 42 to about 48 inches), a frequency of 3.3 to 5.0 Hz (200 to 300 cpm), and a mass of 280 to 320 g. Standard golf clubs with standard specifications. The golf club shaft 15 of the golf club 14 is provided with reflection markers 16a and 16b described later at two measurement points on the golf club, respectively.

  2A and 2B are schematic side views for explaining the behavior of the golf club in the impact state of the golf swing, and correspond to the projection plane viewed from the direction facing the golfer 12 held in the address state. . Each of FIGS. 2A and 2B shows the behavior of the golf club 14 in each of two golf swings having different postures of the golf club in the impact state.

  In the evaluation device 10, the golf club 14 passes through the passage reference lines (the first passage reference line 17 s and the second passage reference line 19 s) extending in a direction substantially perpendicular to the ground on such a projection surface in an impact state. Is set in advance within the range (impact range). Specifically, two planes that are perpendicular to the ground (horizontal plane) on which the golfer 12 stands and are parallel to each other are set in advance. Then, the golfer 12 performs golf swing by setting the golf club head 18 so as to pass through these two planes in the impact state. Each passing reference line (the first passing reference line 17s and the second passing reference line 19s) corresponds to a line of intersection between the two planes and the swing surface of the golf swing performed by the golfer 12. Such a passing reference line is defined by projection light projected from the unit 20 and a light receiving surface of a line sensor 50 described later. The swing surface is a surface that substantially matches the locus of the golf club shaft in the golf swing (that is, in the golf swing, the golf club shaft moves along such a swing surface).

In the golf swing shown in FIG. 2 (a), the length direction of the golf club shaft 15, the state in which the angle alpha ₁ of was keeping a certain size as the ground and substantially perpendicular first passing reference line 17s, Immediately before hitting the golf ball, the length direction of the golf club shaft is substantially perpendicular to the ground (the angle α ₂ formed by the length direction of the golf club shaft and the second passage reference line 19s is relatively small). ing). On the other hand, in the golf swing shown in FIG. 2B, the angle formed by the length direction of the golf club shaft 15 and the second passage reference line 19s substantially perpendicular to the ground is just before hitting the golf ball. Keeping a relatively large angle. As described above, the angle α (α ₁ and α ₂ ) between the length direction of the golf club shaft and the passage reference line that is substantially perpendicular to the ground, and the mode of change of this angle are different for each golf swing. . When comparing FIG. 2 (a) and FIG. 2 (b), the golf swing shown in FIG. 2 (b) has a wrist that precedes the golf club head at the time of impact. It can be said that this is a golf swing with a higher degree. The angle α (α ₁ and α ₂ ) between the length direction of the golf club shaft and the passage reference line that is substantially perpendicular to the ground, and the aspect of the change in this angle well represent the degree of hand first in golf swing. It can be said that. The degree of such hand first affects the loft angle of the face surface of the golf club head at the time of impact, and can be said to characterize the golf swing. The unit 20 obtains and outputs the angle α (α ₁ and α ₂ ) formed by the length direction of the golf club shaft and the passing reference line substantially perpendicular to the ground.

  In the present embodiment, the first passage reference line 17s is separated from the golf ball hitting position on the golf swing set on the projection plane in a direction opposite to the golf ball hitting direction by, for example, 125 mm. This is an imaginary line passing through the selected position and in a direction substantially perpendicular to the ground. The second passage reference line 19s is a line that is substantially perpendicular to the ground and that passes through a position separated by, for example, 75 mm from the installation position in a direction opposite to the striking direction. Both the first passage reference line 17s and the second passage reference line 19s are set within the impact range.

FIG. 3 is a schematic configuration diagram of the unit 20. The unit 20 includes a light source 48, a line sensor 50, a half mirror 52, a mirror 54, a data processing unit 56, and a memory 58 in a housing 46 having a transparent window 42 and a display 44. The unit 20 is connected to the computer 30, and can transmit information detected and derived by the unit 20 to the computer 30 or information stored in the memory 58 from the computer 30. It has become. The unit 20 derives an evaluation value representing the posture of the golf club 14 in the impact state using information on measured timing described later and various kinds of information stored in advance in the memory. Specifically, an angle α (α shown in FIG. 2) formed by the length direction of the golf club shaft 15 and each passage reference line (first passage reference line 17s and second passage reference line 19s) in the impact state. ₁ and α ₂ ), respectively. The angle α derived in the unit 20 is sent to the computer 30. The computer 30 determines the characteristics of the golf swing of the golfer 12 according to the value of the evaluation value (angle α), and outputs the evaluation result.

  The light source 48 of the unit 20 is a light emitting diode (LED) and emits projection light spreading in a conical shape. The projection light emitted from the light source 48 is divided by the half mirror 52, and the projection light component transmitted through the half mirror 52 is transmitted through the transparent window 42 and includes the first measurement target region 17 as the first projection light 22. Irradiate space. The projection light component reflected by the half mirror 52 is reflected by the mirror 54, passes through the transparent window 42, and is irradiated as a second projection light 24 to a space including the second measurement target region 19. The first measurement target region 17 is a predetermined spatial range with a line corresponding to the first passage reference line 17s on the projection plane as a center line. The second measurement target region 19 is a predetermined spatial range with a line corresponding to the second passage reference line 19s on the projection plane as a center line. The light source in the present invention can be any light source such as a halogen lamp or a laser diode as long as it is a light emitter that irradiates the first measurement target region 17 and the second measurement target region 19 with sufficient luminance. do it.

  In the impact state of the golf swing, each of the reflection markers 16 a and 16 b of the golf club 14 passes through the first measurement target region 17 and then passes through the second measurement target region 19. Each of the reflection markers 16 a and 16 b of the golf club 14 receives the first projection light 22 when passing through the first measurement target region 17, and converts the first projection light 22 into the optical path of the first projection light 22. Reflects toward the reverse path. The reflected light 26 (the reflected light from the reflective marker 16a and the reflected light from the reflective marker 16b) of the first projection light 22 reflected in the first measurement target region 17 passes through the transparent window 42 and is a half mirror. The light is reflected at 52 and enters the line sensor 50. In addition, each of the reflection markers 16 a and 16 b of the golf club 14 receives the second projection light 24 when passing through the second measurement target region 19, and reflects it toward the reverse path of the second projection light 24. . The reflected light 28 of the second projection light 24 (the reflected light from the reflective marker 16a and the reflected light from the reflective marker 16b) reflected by the second measurement target region 19 passes through the transparent window 42 and is reflected by the mirror 54. And is incident on the line sensor 50.

  Here, the reflection markers 16a and 16b will be described. 4 (a) and 4 (b) are diagrams for explaining the reflection markers 16a and 16b, and FIG. 4 (a) and FIG. 4 (b) are schematic side views of the reflection markers in different forms. Reflective markers 16a and 16b shown in FIG. 4A (hereinafter, the two are represented simply as reflective marker 16) have a substantially tetrahedral shape on the surface facing the planar bottom surface 61a. The prism layer 61 has a shape in which the prism block portions 61 b are arranged, and a backing layer 63 disposed opposite to the prism block portions 61 b of the prism layer 61. A gap between the prism layer 61 and the backing layer 63 is an air layer 62. In the retroreflecting reflector shown in FIG. 4A, the light I incident at the incident angle θ from the planar bottom surface 61a is refracted at the bottom surface 61a and reflected at the interface between the prism block portion 61b and the air layer 62. And has a function of being reflected from the bottom surface 61a at a reflection angle θ. That is, the incident light is reflected, and reflected light returns through the reverse optical path of the incident light. The reflective markers 16a and 16b shown in FIG. 4 (b) (hereinafter, the two representatives are simply represented as reflective markers 16) are formed of a binder layer 62, a reflective layer 64, a surface film layer 66, and a plurality of glass beads. A retroreflector having a glass bead layer 68 of rows. In such a retroreflective reflector, the light I incident at an incident angle θ is refracted and reflected from the surface film layer 66, the glass bead layer 68, and the reflective layer 64 at a reflection angle θ. It has the function of being reflected. In other words, the retroreflective reflector reflects the incident light and turns it into reflected light that passes back through the reverse optical path of the incident light.

  For example, as shown in FIGS. 4A and 4B, such a retroreflective reflector is configured to be easily pasted by applying an adhesive 70 on the back surface. As retroreflective reflectors, various shapes such as those formed into sheets and tapes are commercially available, so retroreflective reflections formed into these commercially available sheets and tapes The body is cut to a required size, and used by sticking it to a predetermined position of the golf club 14 with an adhesive 70. In the present invention, the retroreflective reflector is not particularly limited. For example, the retroreflector may have a form as shown in FIG. 4A or a form as shown in FIG. For example, a microprism retroreflector such as that shown in FIG. 4B is preferable when it is desired to reflect the irradiated light amount at as much a ratio as possible.

  In the line sensor 50, n photosensors 51a, 51b,... 51n are arranged in a line in one direction. As shown in FIG. 5, the light receiving surface of the line sensor 50 is configured such that the light receiving surfaces of the photosensors 51a, 51b,... 51n are arranged in one direction. The line sensor 50 sequentially outputs (scans) the electrical signals corresponding to the reflected light incident on the light receiving surface of each photosensor output from each photosensor 51 in time series. The line sensor 50 is connected to the data processing unit 56, and the data processing unit 56 acquires time-series electrical signals output from the photosensors arranged in a line in one direction. The first measurement target region 17 and the second measurement target region 19 have a shape corresponding to the light receiving surface of the line sensor 50 and are determined according to the arrangement position and the arrangement angle of the unit 20. In other words, corresponding to the light receiving surface of the line sensor 50, the first measurement target region 17 and the second measurement target region 19, and thus the first passage reference line 17s and the second passage reference line on the projection surface. 19s is fixed.

  The unit 20 is arranged with its direction and position adjusted so that the line sensor 50 can receive light (reflected light) coming from this line-shaped measurement target region. The unit 20 includes the reflective markers 16 (reflective markers 16a and 16b) of the golf club 14 that pass through the linear measurement target regions (first measurement target region 17 and second measurement target region 19 respectively) determined by the line sensor 50. ) And the passage timing of the passage reference lines (the first passage reference line 17s and the second passage reference line 19s), which are the center lines of the respective measurement target regions, are detected.

  Since the present invention uses such a line sensor, when detecting a golf club that passes through a limited line-shaped space (measurement target region), the projection light is limited to the line-shaped measurement target region. There is no need to irradiate. According to the present invention, it is possible to detect a moving object passing through a spatially limited line-shaped measurement target area without using a large and expensive apparatus such as a laser beam irradiation means for irradiating a limited spatial range. can do.

In this embodiment, as shown in FIG. 2, the timing at which the reflective marker 16a passes the first passage reference line 17s in the golf swing is T _{a (P1)} , and the reflection marker 16a passes the second passage reference line 19s. The timing is Ta _(P2) , the timing when the reflection marker 16b passes the first passage reference line 17s is Tb _(P1) , and the timing when the reflection marker 16b passes the second passage reference line 19s is Tb _(P2) . To do.

  FIGS. 6A and 6B are diagrams illustrating an example of detection of the passage timing of each reflection marker 16 (reflection markers 16a and 16b) through the measurement target region by the line sensor 50. FIG. FIG. 6A is a schematic side view showing an example of the state of passage of the golf club 14 in the first measurement target region 17 and the second measurement target region 19 in a golf swing impact state. FIG. 6B is a graph of time-series electric signals output from the line sensor 50 and acquired by the data processing unit 56 in the impact state shown in FIG. In the graph of FIG. 6B, the vertical axis indicates the amount of reflected light corresponding to the electrical signal. When the golf club 14 passes through the first measurement target region 17, each of the photosensors 51 a to 51 n constituting the line sensor 50 divides the first measurement target region 17 into n divided regions 17 a and 17 b that are different from each other. , 17c,..., 17n are received respectively. Similarly, when the golf club 14 passes through the second measurement target region 19, each of the photosensors 51 a to 51 n constituting the line sensor 50 divides the second measurement target region 19 into n divided regions. Lights (reflected light) coming from 19a, 19b, 19c,.

  In this example, the line sensor 50 scans the amount of light received by each of the plurality of photosensors from the top to the bottom at the scan time A (the first measurement target region 17 and the second measurement target region 19 are scanned from the top. The data acquisition means 56 receives a time-series electrical signal output corresponding to a change in the time-series light amount received by each sensor, and the light amount incident on the line sensor 50 has a peak value. Detect timing. In the example shown in FIG. 6A, when the golf club 14 passes through the first measurement target region 17, the golf club 14 moves while being inclined with respect to the first measurement target region 17, and the reflection markers 16 a and 16 b are in the first measurement. It passes through the target area 17 in order. When passing through the first measurement target region 17 and passing through the second measurement target region 19, the golf club 14 is in a state substantially parallel to the extending direction of the second measurement target region 19 and reflected. The markers 16a and 16b pass through the second measurement target region 19 almost simultaneously.

  In this embodiment, the scanning by the line sensor 20 is performed from the top to the bottom. Therefore, the reflection marker 16a provided on the grip side is further scanned as shown in the graph of FIG. 6B. The reflection marker 16b is always detected at a relatively late timing (second half time) of the scanning time A. Upon receiving such a signal output from the line sensor 50, the data processing unit 56 (more specifically, a timing information acquisition unit 82 to be described later) checks the peak position of the light amount (electrical signal) at the scan time A. Thus, the reflected light from the reflective marker 16a and the reflected light from the reflective marker 16b can be distinguished. By checking the peak position of the light amount (electric signal) at the scan time A for each measurement target region, the timing at which each reflection marker passes through each passage reference line can be detected.

  In the case of the line sensor 50, when the time required to scan the entire plurality of photosensors is remarkably shortened, each reflection marker is positioned at the center of each measurement target region, that is, the first passage reference line 17s as described below. The timing of passing through the second passage reference line 19s may be derived. FIGS. 7A and 7B illustrate another example (second example) of detection of the passage timing of each reflection marker 16 (reflection markers 16a and 16b) through the measurement target region by the line sensor 50. FIG. is there. FIG. 7A is a schematic side view showing another example of the state of passage of the golf club 14 in the first measurement target region 17 and the second measurement target region 19 in a golf swing impact state. 7 (b) is a graph of time-series output values output from the line sensor 50 and acquired by the data processing means 56 in the impact state shown in FIG. 7 (a). In this second example, the line sensor 50 detects whether or not the reflected light is received for each of the photosensors 51a, 51b,... 51n at every scan time B (see FIG. 7B). Then, a digital signal indicating whether or not the reflected light is received is output. Then, for each scan time B, an output value corresponding to the arrangement position in the line sensor 50 of each photosensor that detects light is output. The data processing means 50 detects the timing at which each reflection marker passes each passing reference line based on such output values. In the above-described example, the case where the reflection marker 16a and the reflection marker 16b pass through each measurement target region while the scan time A passes has been described. In the second example, the scan time B (for example, 51.2 (μs)) is remarkably shorter than the scan time A. At the scan time B, the reflective marker 16a and the reflective marker 16b pass through each measurement target region. I won't do it.

  In the second example, light is detected from a photosensor that receives reflected light from a measurement target region among a plurality of photosensors of the line sensor 50 at every scan time B (for example, 51.2 μs). An informing digital signal is output. In the line sensor 50, when reflected light is detected by each of the m photosensors in the upper part among the plurality of photosensors of the line sensor 50, that is, light (reflected light) coming from any of the divided regions 17 a to 17 m. ) Is received, the output value “2” is output. In addition, when reflected light is detected by nm photosensors in the lower part among the plurality of photosensors of the line sensor 50, that is, light (reflected light) coming from any one of the divided regions 17m + 1 to 17n. Is received, the output value “1” is output. These divided areas 17a to 17m are upper areas of the divided areas, and this area is set so that only the reflective marker 16a on the grip side among the reflective markers 16a and 16b passes. The divided areas 17m + 1 to 17n are lower areas of the divided areas, and this area is set so that only the reflective marker 16b on the head side among the reflective markers 16a and 16b passes.

  In the example shown in FIG. 7A, when the golf club 14 passes through the first measurement target region 17, the golf club 14 moves while being inclined with respect to the first measurement target region 17, and the reflection markers 16 a and 16 b are in the first measurement. It passes through the target area 17 in order. When passing through the first measurement target region 17 and passing through the second measurement target region 19, the golf club 14 has a relaxed angle with respect to the extending direction of the second measurement target region 19 (small). ) In this state, the reflection markers 16a and 16b are passing through the second measurement target region 19 temporarily at the same time.

In the example shown in FIG. 7, it takes a scan time B × 9 (the number of output values “2” continuously output) for the reflective marker 16 a to pass through the first measurement target region 17. Yes. Reflective markers 16a the timing _{T a} which passes through the center line (i.e. the first pass reference line 17s) in the first measurement target area 17 _(P1), the timing _{T b (P1} of reflective markers 16b passes through the first passage reference line 17s ₎ Are as shown in FIG. 7B.

Further, the reflection markers 16a and 16b pass through the second measurement target region 19 temporarily at the same time. The output value is “3” (output value “2” + “1”) while passing simultaneously at the same time. It takes a scan time B × 11 (the number of output values “2” and “3” being continuously output) for the reflective marker 16a to pass through the second measurement target region 19. Reflective markers 16a center line of the second measurement target area 19 (i.e., the second pass reference line 19s) timing _{T a (P2)} passing through the timing _{T b} of reflective markers 16b passes through the second second pass reference line 19s _(P2) is as shown in FIG. 7B. When the time required to scan the entire plurality of photosensors is remarkably shortened, each timing can be derived in this manner based on the output value output from the line sensor 50.

  FIG. 8 is a schematic configuration diagram for explaining the configuration of the data processing means 56. Hereinafter, the data processing means 56 will be described with reference to FIGS. The data processing means 56 includes a timing information acquisition unit 82, a reference position passage timing difference deriving unit (timing difference deriving unit) 84, a reference position movement required time deriving unit (movement required time deriving unit) 86, and a golf club moving speed deriving unit. (Movement speed deriving unit) 88, a horizontal delay distance deriving unit 90, and a golf club angle deriving unit 92 are provided. The timing information acquisition unit 82 of the data processing unit 56 receives a signal output from the line sensor 50, and passes through the first passage reference line 17s of the first measurement target region 17 for each of the reflection markers 16a and 16b. For each. Similarly, for each of the reflection markers 16a and 16b, the timing of passing through the second passage reference line 19s of the second measurement target region 19 is obtained.

Then, the timing difference deriving unit 84, a timing _{T a} which reflective markers 16a passes through the first passage reference line 17s _(P1), and the timing _{T b} of reflective markers 16b passes through the first passage reference line 17s _(P1) The timing difference _Td1 is obtained. Similarly, reflecting the marker 16a is a timing _{T a} which passes through the second passage reference line 19s _(P2), and the timing _{T b} of reflective markers 16b passes through the second passage reference line 19s _(P2), timing difference T _{d2 is} also obtained and stored in the memory.

The required travel time deriving unit 86 includes a timing Ta _{(P1) at} which the reflective marker 16a passes the first passage reference line 17s, a timing Ta _{(P2) at} which the reflective marker 16a passes the second passage reference line 19s, The timing difference _Tpa is obtained. Similarly, the timing difference between the timing Tb _(P1) when the reflection marker 16b passes the first passage reference line 17s and the timing Tb _(P2) when the reflection marker 16b passes the second passage reference line 19s. T _{pb is} also obtained and stored in the memory 58.

The moving speed deriving unit 88 uses the distance D in the horizontal direction from the ground between at least one of these T _pa and T _pb and the first passage reference line 17s and the second passage reference line 19s in the impact state. As the moving speed V of the golf club, the moving speed between the first passage reference line 17s and the second passage reference line 19s at one of the measurement position 16a and the measurement position 16b is obtained. The memory 58 stores a distance D between the first passage reference line 17s and the second passage reference line 19s. The moving speed deriving unit 88 uses the timing difference T _pa and timing difference T _pb derived by the required moving time deriving unit 82 and the distance D, and the moving speed in the impact state of the reflective marker 16 a provided on the golf club shaft 15. At least one of V _a (= D / T _pa ) or the moving speed V _b (= D / T _pb ) in the impact state of the reflective marker 16 _b is obtained. In addition, this distance D is the first passage reference line 17s and the second passage reference line 19s in the direction parallel to the ground where the golfer stands (the direction perpendicular to both the first passage reference line 17s and the second passage reference line 19s). the distance between these moving speed V _a and V _b are the ground substantially parallel to the direction of the velocity of golfer stands. In the impact state of the golf swing, it can be assumed that the golf club shaft is moving while keeping the length direction perpendicular to the ground (perpendicular to the projection plane). Moving speed V _a represents the movement speed of the reflective markers 16a in impact state, the moving velocity Vb can be said to represent the moving speed of the reflective markers 16b in impact state. In the moving speed deriving unit 88, the golf club moving speed V in the state of impact in the golf swing is calculated using either the moving speed Va of the reflective marker 16a or the moving speed Vb of the reflective marker 16b derived as described above. Is stored in the memory 58.

In the present invention, a golf club in an impact state using a distance D in the horizontal direction from the ground between at least one of T _pa and T _pb and the first passage reference line 17s and the second passage reference line 19s. The moving speed V is not limited to obtaining the moving speed between the first passage reference line 17s and the second passage reference line 19s in one of the measurement position 16a and the measurement position 16b. For example, the moving speed of the predetermined position in the golf club is detected by speed detection means (not shown) capable of detecting the moving speed of the predetermined position in the golf club, and the moving speed of the predetermined position is used as the moving speed V of the golf club. May be. The predetermined position in the golf club for use as the moving speed V of the golf club is not particularly limited.

The horizontal lag distance deriving unit 90 multiplies the obtained moving speed V and the timing difference _Td1 to obtain 2 provided on the golf club shaft when the golf club passes the first passage reference line 17s. One between the measurement positions 16a and 16b of the first passage reference line 17s and vertical direction (i.e., ground and horizontal directions) derives the distance (horizontal delay amount information) F ₁ of. Similarly, by multiplying the moving speed V and the timing difference T _d2 that this determined, golf clubs when passing through the second passage reference line 19s, 2 two measurement positions 16a and 16b provided on the golf club shaft between, the second pass reference line 19s and vertical direction (i.e., ground and horizontal directions) derives the distance (horizontal delay amount information) F _2.

Golf club angle deriving unit 92 uses the delay amount information F ₁ obtained, between the measurement positions 16a and 16b in the golf club shaft, and information of distance L along the length of the golf club shaft, the, An angle α ₁ formed by the length direction of the golf club shaft and the first passage reference line 17s (direction perpendicular to the ground) when passing through the first passage reference line 17s is expressed by the following equation (2). Ask. Similarly, the delay amount information F ₂ obtained by using the information of the distance L between the measurement positions 16a and 16b in the golf club shaft, when passing through the second passage reference line 19s, Golf Club the angle alpha ₂ of the length direction and the second pass reference line 19s of the shaft is obtained using the following equation (3). The memory 58 stores information on the length L between the reflective marker 16a and the reflective marker 16b on the golf club shaft. The golf club angle deriving unit 92 reads out information on such a length L from the memory 58, and when passing through the first passage reference line 17s and the second passage reference line 19s, the respective golf club shaft length directions. And angles (α ₁ and α ₂ ) between the ground and the vertical direction are obtained.
α ₁ = sin ⁻¹ (F ₁ / L) (2)
α ₂ = sin ⁻¹ (F ₂ / L) (3)

As described above, the angle (α ₁ and α ₂ ) formed by the length direction of the golf club shaft and the passage reference line that is substantially perpendicular to the ground, and the mode of change of this angle (the magnitude of α ₁ and α ₂ The difference between the first and second) well represents the degree of hand first in golf swing, and the degree of such hand first affects the loft angle of the face surface of the golf club head at the time of impact. It can be said that the evaluation value characterizes the swing.

In the data processing unit 56, by using the moving velocity V _a and V _b obtained in the moving speed deriving portion 88, in the golf swing may be obtained head speed V _h and the grip end speed V _g in impact state . 9, in the golf swing, the head speed V _h and the grip end speed V _g in impact state, the moving speed V _a in the impact state of the reflective markers 16a provided in a golf club shaft 15, the impact of the reflective markers 16b It is a figure explaining the relationship with the moving speed _Vb in a state, and is a schematic side view which shows the behavior of the golf club 14 in the impact state during a golf swing.

As described above, the movement of any position on the golf club shaft in the golf swing (grip position 18a, head position 18b, reflection marker 16a application position, reflection marker 16b application position, etc.) is generally golf. It can be approximated by a motion of a substantially circular orbit around a specific position (virtual rotation center position) on the extension line of the central axis of the club shaft. From the geometric similarity, the magnitude of the head speed vector V _h (head speed V _h ) and the magnitude of the grip speed vector V _g (grip speed V _g ) in a direction substantially parallel to the ground on which the golfer stands are shown. Can be expressed by using the moving speeds V _a and V _b (indicated by the velocity vector V _a and the velocity vector V _b in FIG. 7) of the reflective marker 16a and the reflective marker 16b, respectively. More specifically, the head speed V _h and the grip speed V _g are respectively the distance R between the virtual rotation center position of the golf swing and the grip position of the golf club, and the two measurement positions (reflection markers 16a and 16b). more measurement positions of the grip side from (the position corresponding to the velocity vector V _a), along the golf club shaft of the distance l, the measurement position of the two positions to the clip position the set (reflective markers 16a and 16b) direction distance H, and the magnitude of the velocity vector V _a (moving velocity V _a), and velocity magnitude of the vector V _b (moving velocity V of the distance L, from the grip position of the golf club to the head position of the golf club head portion _b ).

Specifically, the distance R from the virtual rotation center position to the grip position of the golf club can be expressed by the following formula (4), and the grip speed V _g and the head speed V _h are respectively expressed by the following formula (5). And the following formula (6).
R = {(V _a −V _b ) × l + L × V _a } / (V _b −V _a ) (4)
V _g = (V _a × R) / (R + 1) (5)
V _h = {V _a × (R + H)} / (R + l) (6)

From the above formulas (4) to (6), the head speed V _h and the grip speed V _g are calculated by the formulas (7) and (8), respectively.
V _g = {(L + l) × V _a −l × V _b } / L (7)
V _h = {(L + l−H) × V _a + (H−l) × V _b } / L (8)

In this way, the data processing means 56 may calculate the head speed V _h and the grip speed V _g at the time of impact using the moving speeds V _a and V _b derived by the moving speed deriving unit 88.

Even if the golf swings such as the head speed V _h and the grip speed V _g are the same, if the posture of the golf club in the impact state is different, for example, the orientation of the face surface (loft angle) at the time of impact Are different. Thus, if the orientation of the face surface (loft angle) at the time of impact differs, the trajectory of the golf ball launched by the golf swing also differs. The angle α (α ₁ and α ₂ ) between the length direction of the golf club shaft and the reference line that is substantially perpendicular to the ground has a good first-hand effect that affects the loft angle of the face surface of the golf club head. Represents. Such a degree of hand first (the angles α (α ₁ and α ₂ ) formed above) can be said to be an important index characterizing the golf swing together with the head speed V _h and the grip speed V _g .

The obtained evaluation value, that is, the angle α (α ₁ and α ₂ ) between the length direction of the golf club shaft and the direction perpendicular to the ground, and the degree of change in the angle formed (α ₂ -α _1, etc.) ) Is output on the display 44 provided in the housing 46. The display 44 is a known display device such as a liquid crystal display, and can display various information such as a grip speed V _g , a head speed V _h and a V _h / V _g required by the unit 20 in addition to the evaluation value α. It can be configured.

The computer 30 receives the evaluation values calculated by the unit 20 and determines the golf swing characteristics of the golfer 12 according to these evaluation values (α ₁ , α ₂ , and α ₂ −α ₁ ). In the computer 30, for example, the evaluation value α ₂ is compared with a predetermined threshold value. When the calculated evaluation value α ₂ is equal to or larger than the predetermined threshold value, “Your golf swing is displayed on the display 34 of the computer 30. "Swing with a high degree of hand first," and the like. In addition, the evaluation value α ₂ obtained, if it is smaller than a predetermined threshold, the display 34, "your golf swing is a swing degree of hand fast is small," such as to display the contents of the letter. It should be noted that, if the evaluation value α ₂ obtained is a negative value, in the golf swing, which means that more of the golf club head is ahead of the grip portion of the golf club. In this case (when the evaluation value α is a negative value), it is only necessary to display characters such as “Your golf swing is a swing with a tendency opposite to hand first”.

Further, the computer 30, the evaluation value alpha ₁ and evaluation value alpha ₂ received from the unit 20, the first passage reference line 17s and the second pass reference line 19s, ground and the horizontal distance D, the measurement positions 16a and 16b Based on information such as the distance L between the two, a diagram representing the behavior of the golf club in the impact state may be created and displayed on the display 34. FIGS. 10 (a) and 10 (b) show examples of such diagrams created by the computer 30 and displayed on the display 34. The golf clubs in the impact state in different golf swings are shown in FIGS. Each behavior is represented. By displaying such a diagram, the operator or the golfer 12 himself / herself can change the behavior of the golf club in the impact state (the angle between the golf club shaft and the passage reference line when passing through each passage reference line, It is possible to intuitively grasp the degree of change in the angle between the passing reference lines and the degree of hand first in the golf swing.

  For example, in the example shown in FIG. 10, the golf club shown in FIG. 10A is closer to the golf club just before the impact (when passing through the second passage reference line) than in the figure shown in FIG. It can be seen that the grip side of the shaft is leading. In addition, it can be seen that the golf swing represented by the diagram shown in FIG. 10A has less change in the angle formed as it approaches the impact. It can be said that the golf swing represented by the diagram shown in FIG. 10A is a golf swing having a higher hand first degree in which the grip portion precedes the impact and the golfer's wrist is less bent.

  FIG. 11 is a flowchart of an example of the golf swing evaluation method of the present invention that is implemented using such an apparatus 10. In the golf swing evaluation method of the present invention, first, the golfer 12 grips the golf club 14 provided with the reflective marker 16a and the reflective marker 16b, and performs golf swing (step S102). In the apparatus 10, for the golf swing performed by the golfer 12, the first passing reference line 17 s and the second passing reference are used for the positions corresponding to the reflective marker 16 a and the reflective marker 16 b provided on the golf club 14 using the unit 20. The passage timing of the line 19a is obtained.

  Specifically, the timing information acquisition unit 82 receives a signal output from the line sensor 50, and determines the timing at which each of the reflection markers 16 a and 16 b passes through the first passage reference line 17 s of the first measurement target region 17. Ask for each. Similarly, for each of the reflection markers 16a and 16b, the timing of passing through the second passage reference line 19s of the second measurement target region 19 is obtained (step S104).

Then, the timing difference deriving unit 84, a timing _{T a} which reflective markers 16a passes through the first passage reference line 17s _(P1), and the timing _{T b} of reflective markers 16b passes through the first passage reference line 17s _(P1) The timing difference _Td1 is obtained. Similarly, reflecting the marker 16a is a timing _{T a} which passes through the second passage reference line 19s _(P2), and the timing _{T b} of reflective markers 16b passes through the second passage reference line 19s _(P2), timing difference T _{d2 is} also obtained and stored in the memory (step S106).

Along with this, the movement required time deriving unit 86 has a timing T _{b (P1)} when the reflective marker 16a passes the first passage reference line 17s and a timing Ta _{(P2 )} when the reflective marker 16a passes the second passage reference line 19s. ₎ And a timing difference _Tpa . Similarly, the timing difference between the timing Tb _(P1) when the reflection marker 16b passes the first passage reference line 17s and the timing Tb _(P2) when the reflection marker 16b passes the second passage reference line 19s. T _{pb is} also obtained and stored in the memory (step S108).

Then, the moving speed deriving unit 88 uses the distance D in the horizontal direction from the ground between at least one of these T _pa and T _pb , the first passage reference line 17 s, and the second passage reference line 19 s to perform an impact. The moving speed V of the golf club in the state is obtained (step S110). The moving speed V is a moving speed between the first passage reference line 17s and the second passage reference line 19s at one of the measurement position 16a and the measurement position 16b. As described above, the memory 58 stores the distance D between the first passage reference line 17s and the second passage reference line 19s. The moving speed deriving unit 88 uses the timing difference T _pa and timing difference T _pb derived by the required moving time deriving unit 82 and the distance D, and the moving speed in the impact state of the reflective marker 16 a provided on the golf club shaft 15. At least one of V _a (= D / T ₁ ) or the moving speed V _b (= D / T ₂ ) in the impact state of the reflective marker 16 _b is obtained. In the movement speed deriving unit 88, the movement speed V of the golf club in the state of impact in the golf swing is calculated by using either the movement speed Va of the reflection marker 16a or the movement speed Vb of the reflection marker 16b derived as described above. Is stored in the memory 58.

Then, the horizontal delay distance deriving unit 90, from the calculated moving speed V and the timing difference T _d1 Prefecture, golf clubs when passing through the first passage reference line 17s, 2 two measurement positions provided on the golf club shaft between 16a and 16b, and derives a delay amount information _{F 1} of the ground and the horizontal direction. Similarly, from the obtained moving speed V and timing difference _Td2 , the ground between the two measurement positions 16a and 16b provided on the golf club shaft when the golf club passes through the second measurement target region. and to derive the horizontal direction of the delay amount information _{F 2} (step S112).

Then, using a golf club angle deriving unit 92, the delay amount information F ₁ obtained, between the measurement positions 16a and 16b in the golf club shaft, and information of distance L along the length of the golf club shaft, the Te, when passing through the first passage reference line 17s, the angle alpha ₁ between the length direction and the ground of a golf club shaft seek. Similarly, using the obtained delay amount information F2 and the information on the distance L between the measurement positions 16a and 16b on the golf club shaft, the golf club shaft when passing through the second passage reference line 19s. of determining the angle alpha ₂ of the length direction and the ground (step S114). The memory 58 stores information on the length L between the measurement position a and the measurement position b on the golf club shaft. The golf club angle deriving unit 92 reads out information on such a length L from the memory 58, and when passing through the first passage reference line 17s and the second passage reference line 19s, the respective golf club shaft length directions. And the angle between the ground and the vertical direction.

Then, the computer 30 receives the evaluation value calculated by the unit 20 and determines the golf swing characteristics of the golfer 12 according to these evaluation values (α ₁ , α ₂ , and α ₂ −α ₁ ). Then, the computer 30 compares the evaluation value with the threshold value, and outputs the evaluation result corresponding to the comparison result on the display 34 as described above (step S116). The golf swing evaluation method of the present invention is implemented as described above.

  In the above embodiment, the swing measurement / data processing unit 20 is provided with the data processing means 56 that receives the digital information indicating the timing and calculates the evaluation value. In the golf swing evaluation apparatus of the present invention, such data processing means may be provided in a computer connected to the swing measurement / data processing unit. In other words, the swing measurement / data processing unit may acquire and output only digital information representing timing, and the computer (CPU) that acquired this information may obtain the evaluation value by executing software.

  Table 1 below shows the golf club shaft length direction and the passage perpendicular to the ground when passing through a plurality of passage reference lines in the golf swing impact state using the golf swing evaluation method of the present invention. The result of deriving the angle made with the reference line is shown. Table 1 below shows the result of deriving the angle formed by the length direction of the golf club shaft and the passing reference line based on an image showing the behavior of the golf club in the same golf swing taken with a camera. Also shown together. At this time, two different types of golf swing were performed using a predetermined golf club of standard specifications having a length of 45 inches (about 1143 mm), a frequency of 245 cpm (about 4.1 Hz), and a mass of 296 g. This golf swing was performed using a known swing robot. The golf club shaft of this golf club is provided with two reflective markers spaced apart by 190 mm along the golf club shaft axis. The first passage reference line was an imaginary line in a direction substantially perpendicular to the ground passing through a position separated by 125 mm in the direction opposite to the golf ball hitting direction by the golf club from the installation position of the golf ball in the golf swing. Further, the second passage reference line was a line substantially perpendicular to the ground passing through a position separated by 75 mm from the installation position in a direction opposite to the striking direction.

The results according to the present invention in Table 1 are as follows. For the two different golf swings A and B, the apparatus 10 shown in FIG. 1 is used and the first passing reference line is passed according to the flowchart shown in FIG. Angle α ₁ formed by the length direction of the golf club shaft and the first passage reference line, and angle formed by the length direction of the golf club shaft and the second passage reference line when passing through the second passage reference line it is the result of obtaining the α _2. In addition, in order to derive the respective timings at which each reflective marker passes the first passage reference line and the second passage reference line based on the output signal from the line sensor, the above-described second example (a plurality of line sensors may be used). The method described in the case where the time required to scan the entire photosensor is remarkably shortened) was used. The scan time B of the entire line sensor was 51.2 (μs). When the measurement results based on the images in Table 1 were derived, the state of the golf club in the same golf swing performed using the same golf club was continuously photographed using a high-speed camera. Then, from the image of the golf club passing through the first passage reference line, the angle α ₁ ′ formed by the length direction of the golf club shaft and the first passage reference line when passing through the first passage reference line. And the length direction of the golf club shaft when passing through the second passage reference line, and the second passage reference line from the image of the golf club when passing through the second passage reference line The angle α ₂ ′ is measured and obtained. Note that the angle α formed (the angle α ₂ ′ formed in the swing B) has a negative value means that the golf club shaft is preceded by the golf club head side rather than the golf club shaft grip side. It shows that it is inclined.

  As shown in Table 1, the angle formed by the golf club shaft length direction and each passing reference line, which was derived using the golf swing evaluation method of the present invention, was confirmed by an image obtained by actually shooting the golf swing. The angle formed by the length direction of the golf club shaft and each passing reference line is in good agreement. Then, it can be confirmed that the golf swing A has a higher degree of hand first, and the golf swing B has a lower degree of hand first. Furthermore, it can also be confirmed that the golf swing B is a swing that precedes the golf club head side rather than the grip side of the golf club shaft. By using the golf swing evaluation device and the golf swing evaluation method of the present invention, the angle formed by the length direction of the golf club shaft and each passing reference line can be derived with high accuracy. As a result, the degree of hand first in the golf swing can be determined. Can be evaluated with high accuracy.

  Conventionally, in order to acquire information on the posture of a golf club in a golf swing, a large-scale device using a magnetic sensor or the like has been required. By using the golf swing evaluation method of the present invention, it is possible to easily and accurately evaluate the hand first degree in a golf swing using a relatively inexpensive apparatus with a simple configuration.

  As described above, the golf class wing evaluation apparatus and method according to the present invention have been described in detail. However, the present invention is not limited to the above-described embodiments, and various modifications are possible without departing from the gist of the present invention. Improvements and changes may be made.

It is a schematic side view which shows the structure of an example of the golf swing evaluation apparatus of this invention. (A) And (b) is a schematic side view explaining the behavior of the golf club in the impact state of a golf swing, respectively. It is a schematic block diagram which shows the structure of the swing measurement and data processing unit with which the golf swing evaluation apparatus shown in FIG. 1 is provided. It is a schematic sectional drawing of the reflective marker installed in a golf club used with the golf swing evaluation method of this invention. It is a schematic block diagram explaining the line sensor with which the swing measurement and data processing unit shown in FIG. 3 is provided. It is a figure explaining an example of the detection of the passage timing of a golf club in the swing measurement and data processing unit shown in FIG. 3, (a) is a 1st measurement object area | region and a 2nd measurement in the state of the impact of a golf swing. It is a schematic side view shown about an example of the passage state of the golf club in an object field, and (b) is a time series electric signal graph outputted from a line sensor in the impact state shown in (a). It is a figure explaining the other example of the detection of the passage timing of a golf club in the swing measurement and data processing unit shown in FIG. 3, (a) is a 1st measurement object area | region and the 1st in the state of the impact of a golf swing. It is a schematic side view shown about the other example of the state of the passage of the golf club in 2 measurement object area | regions, (b) has shown the output value output from a line sensor in the impact state shown to (a). It is a schematic block diagram explaining the structure of the data processing means with which the swing measurement and data processing unit shown in FIG. 3 is provided. During a golf swing, the head speed V _h and the grip end speed V _g of the impact state, provided on a golf club shaft, the moving speed V _a in the impact state of the reflective markers grip side impact condition of the reflective markers on the head side It is a figure explaining the relationship with the moving speed _{Vb in} and is a schematic side view which shows the behavior of the golf club in the impact state in a golf swing. (A) And (b) is an example of the figure showing the behavior of the golf club in an impact state respectively displayed on the display with which the golf swing evaluation apparatus shown in FIG. 1 is equipped. It is a flowchart figure of an example of the evaluation method of the golf swing of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Evaluation apparatus 12 Golfer 14 Golf club 15 Golf club shaft 16a, 16b Reflective marker 17 1st measurement object area | region 17s 1st passage reference line 18a Grip position 18b Head position 19 2nd measurement object area 19s 2nd passage reference line 20 Swing measurement Data processing unit 22 First projection light 24 Second projection light 26, 28 Reflected light (projected light reflected light)
DESCRIPTION OF SYMBOLS 30 Computer 32 Main body 34 Display 36 Input means 42 Transparent window 44 Display 46 Case 46 Light source 50 Line sensor 51a, 51b, ... 51n Photo sensor 52 Half mirror 54 Mirror 56 Data processing means 58 Memory 62 Binder layer 64 Reflective layer 66 Surface film layer 68 Glass bead layer 70 Adhesive 82 Timing information acquisition unit 84 Reference position passage timing difference deriving unit 86 Reference line movement required time deriving unit 88 Golf club moving speed deriving unit 90 Horizontal delay distance deriving unit 92 Golf club angle deriving unit Part

Claims (11)

A golf swing performed by a golfer standing on a horizontal plane holding a golf club is a method for evaluating the characteristics of the golf swing by analyzing the behavior of the golf club in an impact state immediately before hitting a golf ball. And
A plurality of measurement points set along the golf club shaft axis of the golf club on the projection plane viewed from the side facing the golfer held in the address state are preset passage criteria set on the projection plane. A passage timing detection step for detecting each timing of passing through the line;
The posture of the golf club shaft in the impact state is represented based on the information on the timing to pass each of the measurement points detected in the passage timing detection step and the moving speed information of the golf club in the impact state. An evaluation step for calculating and outputting an evaluation value,
The golf swing evaluation method, wherein the passage reference line is set in a direction substantially perpendicular to the horizontal plane within a range in which the golf club shaft of the golf club passes in the impact state. In the evaluation step,
Multiplying the time difference between the passing timings of each of the plurality of measurement points passing through the passing reference line detected in the passing timing detecting step by the information on the moving speed of the golf club in the impact state. And deriving a distance perpendicular to the passage reference line between the plurality of measurement points when passing through the passage reference line,
Using the derived vertical distance and information on the distance along the golf club shaft axis between the plurality of measurement points, an evaluation value representing the degree of hand first of the golf swing is calculated and output. The golf swing evaluation method according to claim 1, wherein: Two measurement points are set along the golf club shaft axis of the golf club,
When the magnitude of the distance in the vertical direction is F, and the magnitude of the distance along the golf club shaft axis between the two measurement points is L,
In the evaluation step, as the evaluation value, an angle α formed between the length direction of the golf club shaft and the passage reference line when passing the passage reference line is derived using the following formula (1). The golf swing evaluation method according to claim 2, wherein:
α = sin ⁻¹ (F / L) (1) A plurality of the passage reference lines are set in a range in which the golf club passes in the impact state, and in the passage timing detection step, a timing at which each of the plurality of measurement points passes through each of the plurality of passage reference lines. Detect
In the evaluation step,
The time difference between the passage timings of each of the plurality of passage reference lines, the horizontal plane between the plurality of passage reference lines, and one of the plurality of measurement points detected in the passage timing detection step, Based on the distance in the parallel direction, the moving speed of the one measuring point is derived,
4. The golf according to claim 1, wherein the evaluation value is calculated using the derived moving speed of the one measurement point as moving speed information of the golf club in the impact state. Swing evaluation method. A golf swing performed by a golfer standing on a horizontal plane holding a golf club is an apparatus for analyzing the behavior of the golf club in an impact state immediately before hitting a golf ball and evaluating the characteristics of the golf swing. And
A plurality of measurement points set along the golf club shaft axis of the golf club on the projection plane viewed from the side facing the golfer held in the address state are preset passage criteria set on the projection plane. Passage timing detection means for detecting the timing of passing through each line;
The posture of the golf club shaft in the impact state is represented based on the information on the timing to pass each of the measurement points detected in the passage timing detection step and the moving speed information of the golf club in the impact state. An evaluation means for calculating and outputting an evaluation value,
The golf swing evaluation apparatus, wherein the passing reference line is set in a direction substantially perpendicular to the horizontal plane within a range in which the golf club shaft of the golf club passes in the impact state. The evaluation means includes
Multiplying the time difference between the passing timings of each of the plurality of measurement points passing through the passing reference line, detected by the passing timing detecting means, and information on the moving speed of the golf club in the impact state. And deriving a distance perpendicular to the passage reference line between the plurality of measurement points when passing through the passage reference line,
Using the derived vertical distance and information on the distance along the golf club shaft axis between the plurality of measurement points, an evaluation value representing the posture of the golf club shaft in the impact state is calculated. The golf swing evaluation apparatus according to claim 5, wherein the golf swing evaluation apparatus outputs the golf swing. Two measurement points are set along the golf club shaft axis of the golf club,
When the magnitude of the distance in the vertical direction is F, and the magnitude of the distance along the golf club shaft axis between the two measurement points is L,
The evaluation means derives, as the evaluation value, an angle α formed by the length direction of the golf club shaft and the passage reference line when passing the passage reference line using the following formula (1). The golf swing evaluation apparatus according to claim 6.
α = sin ⁻¹ (F / L) (1) A plurality of the passage reference lines are set in a range in which the golf club passes in the impact state, and the passage timing detection means is a timing at which each of the plurality of measurement points passes through each of the plurality of passage reference lines. Detect
The evaluation means includes
The time difference between the passing timings of each of the plurality of passing reference lines, the horizontal plane between the plurality of passing reference lines, and any one of the plurality of measurement points detected by the passing timing detecting means Based on the distance in the parallel direction, the moving speed of the one measuring point is derived,
8. The golf according to claim 5, wherein the evaluation value is calculated using the derived moving speed of the one measurement point as moving speed information of the golf club in the impact state. Swing evaluation device. The golf swing is performed by holding a golf club provided with a reflective marker at each of the plurality of measurement points of the golf club shaft,
The passage timing detection means includes
A light source for emitting projection light;
A projection unit that projects the projection light from the light source toward the measurement region corresponding to the passage reference line; and
A line sensor that detects the timing of passing through the passage reference line for each of the plurality of measurement points by detecting the reflected light of the projection light in the measurement region from the plurality of reflection markers,
The golf swing evaluation device according to any one of claims 5 to 8, wherein the golf swing evaluation device is provided. A plurality of the passing reference lines are set in a range through which the golf club passes in the impact state,
The projection unit of the passage timing detection unit projects the projection light toward each measurement region corresponding to each passage reference line, and the line sensors of the passage timing detection unit are respectively different from the plurality of measurement regions. , By detecting the reflected light of the projection light, respectively, in each of the plurality of measurement points, to detect the timing of each of the plurality of measurement points passing,
The evaluation means includes
The time difference between the passage timings of each of the plurality of passage reference lines, which is detected by the passage timing detection means, among the plurality of measurement points, and parallel to the ground between the passage reference lines. Based on the distance in the direction, the moving speed of the one measuring point is derived,
The golf swing evaluation apparatus according to claim 9, wherein the evaluation value is calculated using the derived movement speed of the one measurement point as movement speed information of the golf club in the impact state.   The reflective marker is a retroreflective reflector formed in a tape shape and affixed to the golf club shaft, and reflects the projection light on the reverse optical path from the light source to the passage reference line. The golf swing evaluation apparatus according to claim 9 or 10, wherein:

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