JP2017018169A - Display method and display chart of swing of golf club - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately provide features of a swing which affect the position of an impact area of a golf ball.SOLUTION: A display screen of a display 46 shows a two-dimensional coordinate axis indicating a right/left approach angle θ and a hit-time face angle φ, a plurality of areas that are bordered from each other according to the tendency of a course of a golf ball 2 with consideration of a shift amount ΔS estimated from the right/left approach angle θ and the hit-time face angle φ, and measurement points obtained by measuring the behavior of a golf club head 16 at a time when a golfer actually performed a swing. The plurality of areas displayed include a slice area A1, a fade area A2, a straight area A3, a draw area A4, and a hook area A5, which is advantageous in simple and intelligible provision of the features of the swing which affect the course of the ball, such as slice and hook, on the basis of the area in which the measurement point is positioned.SELECTED DRAWING: Figure 23

Description

  The present invention relates to a golf club swing display method and display chart.

Conventionally, as a method of measuring and analyzing a golf swing, a method of capturing a golf swing with a camera, analyzing a behavior of the golf club head from the captured image, and extracting a feature of the golf swing, or a golf club head with a magnetic sensor A method for directly measuring the behavior of a golf club, or a method for measuring the behavior of a golf club head using an interrupter type optical sensor that senses that a plurality of light beams arranged at predetermined positions pass across the golf club head. Can be mentioned.
All of these can measure the approximate trajectory of the golf club head, but cannot accurately grasp the behavior of the golf club head immediately before the golf ball hitting the golf ball.

On the other hand, Patent Documents 1 and 2 below describe devices that can measure the behavior of a golf club when a golf ball is hit.
As described in [0023] of Patent Document 1, by arranging four sensors, it is possible to roughly know the incident angle of the golf club head with respect to the golf ball. Similarly, in Patent Document 2, it is possible to roughly know the incident angle of the golf club head with respect to the golf ball by arranging four sensors.
However, in the measurement of the behavior of the golf club according to Patent Documents 1 and 2, although the golf club head can roughly know the incident angle of the golf club head with respect to the golf ball, the golf that affects the spherical muscles such as hooks and slices of the golf ball. It was difficult to easily understand the characteristics of the club swing.

Therefore, the present applicant has proposed a swing display method for a golf club that makes it easy and easy to understand the characteristics of the swing that affects the ball muscle (see Patent Document 3).
In this display method, a reference line obtained by projecting a target line connecting the center of the golf ball and the target onto a plane parallel to the horizontal plane and a tangent line to the movement locus of the golf club head immediately before hitting the golf ball are projected onto the plane. The angle formed by the straight line is the left / right approach angle.
The angle formed between the reference line and the second straight line projected on the plane from the normal line passing through the center point of the face surface of the golf club head immediately before hitting the golf ball is defined as the face angle at the time of hitting.
An X axis indicating the left and right approach angle and a Y axis perpendicular to the X axis and indicating the face angle at the time of hitting are formed, and the intersection of the X axis and the Y axis is formed as a zero degree of the left and right approach angle and the face angle at the time of hitting. On the display screen, the two-dimensional coordinates and a plurality of areas divided according to the tendency of the spherical muscles are displayed on the two-dimensional coordinates.
The plurality of areas are, for example, a slice area, a fade area, a hook area, a draw area, and a straight area.
Then, on the display screen, coordinate points indicating the value of the left and right approach angle measured when the golfer hits the golf ball using the golf club and the value of the face angle at the time of hitting are displayed as measurement points.

JP 2001-314540 A Japanese Patent No. 3073828 JP 2011-110164 A

According to the above-described conventional technology, it is advantageous in displaying swing characteristics that affect the ball muscles such as hooks and slices of a golf ball in a simple and easy-to-understand manner.
By the way, the ball of the golf ball has a better evaluation as the distance (shift amount) from the reference line to the landing point is shorter.
In the above prior art, although the ball muscle is evaluated in consideration of the left and right approach angle when the golf ball is hit and the face angle at the time of hitting, the actual trajectory of the golf ball, in other words, the shift amount is affected. The left and right launch angles of the hit golf ball and the side spin amount of the hit golf ball are not sufficiently considered.
For this reason, the conventional technology has room for improvement in evaluating the distance (shift amount) from the reference line to the landing point more accurately.
The present invention has been made in view of such circumstances, and an object of the present invention is to display a swing of a golf club that is advantageous in accurately providing a swing feature that affects the position of a landing point of a golf ball. The object is to provide a method and display chart.

In order to achieve the above object, the present invention displays on a display device swing characteristics measured based on the behavior of a golf club head immediately before the golf club head of a golf club swung by a golfer hits a golf ball. A method for displaying a swing of a golf club, comprising: a reference line obtained by projecting a target line connecting the center of the golf ball and a target onto a plane parallel to a horizontal plane; and the golf club head immediately before hitting the golf ball. The angle formed by the first straight line projected on the plane with the tangent to the movement trajectory is the left and right approach angle, and the sign of the left and right approach angle is the positive angle on the opposite side of the golfer with the reference line as the center. Is a negative angle, and the golf club head fades immediately before hitting the golf ball with the reference line. The angle formed by the normal line passing through the center point of the surface and the second straight line projected on the plane is the face angle at the time of hitting, and the positive / negative of the face angle at the time of hitting is positive on the opposite side of the golfer around the reference line. A line obtained by projecting a trajectory of a golf ball immediately after being hit by a golf club head of a golf club swung by the golfer onto the plane and the reference line. The golf ball of the golf club swung by the golfer has a left and right launch angle, and the positive and negative of the left and right launch angle is a positive angle on the opposite side of the golfer around the reference line and a negative angle on the golfer side. The amount of spin around the vertical line passing through the center of the golf ball immediately after being hit by the club head is taken as the amount of side spin. The positive or negative side spin amount is positive in the clockwise direction in plan view, negative in the counterclockwise direction, and the left and right launch angles and the side spin amount are estimated from the measured values of the left and right approach angles and the hitting face angle. Based on the estimation step, the estimated left and right launch angle and the side spin amount, the initial ball velocity of the golf ball, and the up and down launch angle of the golf ball, the movement trajectory of the golf ball is simulated and the reference line By repeating the simulation step for calculating the shift amount that is the distance from the landing point to the landing point, the estimation step, and the simulation step, data including the left and right approach angles, the striking face angle, and the shift amount is accumulated. Based on the accumulated data, the X axis indicating the left and right approach angles, and The left and right approach angles and the striking face angle on a two-dimensional coordinate with the Y axis indicating the striking face angle and the intersection of the X axis and Y axis as the left and right approach angles and the zero angle of the striking face angle. A classification map creating step for creating a classification map that defines a plurality of areas demarcated according to the tendency of the spherical muscle specified based on the shift amount and the two-dimensional coordinate axes on the display screen of the display device A coordinate axis display step for displaying the image, various area display steps for displaying a plurality of areas on the display screen based on the classification map, and when the golfer hits a golf ball using a golf club on the display screen. And a measurement point display step of displaying, as measurement points, coordinate points indicating the measured value of the left and right approach angle and the value of the face angle at the time of hitting.
Further, the present invention is a golf club swing display chart displaying swing characteristics measured based on the behavior of the golf club head immediately before the golf club head of the golf club swung by the golfer hits the golf ball. Then, a reference line obtained by projecting a target line connecting the center of the golf ball and the target onto a plane parallel to a horizontal plane and a tangent to the movement track of the golf club head immediately before hitting the golf ball are projected onto the plane. The angle formed by the first straight line is a left and right approach angle, and the positive and negative of the left and right approach angle is a positive angle on the opposite side of the golfer around the reference line, a negative angle on the golfer side, and the reference line A normal line passing through the center point of the face surface of the golf club head immediately before hitting the golf ball is the plane. The angle formed by the projected second straight line is the face angle at the time of hitting, and the positive / negative of the face angle at the time of hitting is the positive angle on the opposite side of the golfer around the reference line, and the negative angle on the golfer side An X axis indicating the left and right approach angle and a Y axis perpendicular to the X axis and indicating the face angle at the time of hitting, and the intersection of the X axis and the Y axis is the left and right approach angle and the face angle at the time of hitting. Two-dimensional coordinates formed as zero degrees, and a plurality of areas divided on the two-dimensional coordinates according to the tendency of spherical muscles, and intersect the X axis and the Y axis in the two-dimensional coordinate axes. A first boundary line consisting of a straight line corresponding to zero and the shift amount extending with a positive slope, and a positive line that intersects the first boundary line on the two-dimensional coordinate axis and is larger than the first boundary line. The amount of side spin extending with a slope of And a plurality of areas divided according to the tendency of the spherical muscles are sandwiched between the first boundary line and the second boundary line. Of the two areas, the draw area displayed in the area located near the positive direction of the X axis and the Y axis, and the two areas sandwiched between the first boundary line and the second boundary line, A fade area displayed in a region located closer to the negative direction of the X axis and the Y axis, a slice area displayed in a region located on the positive side of the Y axis than the draw area and the fade area, and the draw A hook area displayed in an area located on the negative direction side of the Y axis with respect to the area and the fade area, and a straight area displayed on the second boundary line are included. .

  According to the golf club swing display method and display chart of the present invention, based on the left and right approach angles and the hitting face angle of the golf club head immediately before hitting the golf ball, and the left and right approaching angles and the hitting face Since the type of golf swing is classified in consideration of the shift amount estimated from the angle, it is advantageous to more accurately classify the type of golf swing that affects the position of the landing point of the golf ball.

It is explanatory drawing of the element which affects the ball | bowl muscle of the golf ball hit | struck by the golf club which the golfer swung. 1 is a block diagram showing a configuration of a golf club setting device 10 of the present embodiment. (A) is a perspective view of an iron-based golf club head 16A to be measured by the golf club selection device 10, (b) is a perspective view of a wood-based golf club head 16B, and (c) is a marker 20a, 20b. 20c and marker feature points 21a, 21b, 21c. 2 is a perspective view of an irradiation photographing unit 11. FIG. 3 is a plan view of an irradiation photographing unit 11. FIG. It is a top view which shows the modification of the irradiation imaging | photography part 11. FIG. 2 is a block diagram showing a configuration of a computer 14. FIG. 2 is a functional block diagram of a computer 14. FIG. (A) is a schematic diagram showing the time history of marker movement determined from the three-dimensional position coordinates of the marker feature points, and (b) shows the behavior of the golf club head based on the time history of marker movement shown in (a). It is a schematic diagram. 1 is a plan view showing a state in which a golf club head 16 just before hitting a golf ball 2 is viewed in plan. It is a plane schematic diagram explaining the right-and-left approach angle (theta). It is a schematic diagram explaining the face angle φ at the time of impact. FIG. 5 is a schematic diagram when a horizontal approach angle X is taken on the horizontal axis (X axis), a face angle φ at impact is taken on the vertical axis (Y axis), and left and right launch angle data is arranged at each coordinate point. FIG. 5 is a schematic diagram when a horizontal approach angle X is taken on the horizontal axis (X axis), a face angle φ at impact is taken on the vertical axis (Y axis), and side spin amount data is arranged at each coordinate point. It is a schematic diagram explaining the structure of a classification map. It is a schematic diagram explaining each area and a boundary line. It is the 1st explanatory view of a classification map in case a golf club is a driver. It is the 2nd explanatory view of a classification map in case a golf club is a driver. It is the 3rd explanatory view of a classification map in case a golf club is a driver. It is the 1st explanatory view of a classification map in case a golf club is an iron. It is the 2nd explanatory view of a classification map in case a golf club is an iron. It is the 3rd explanatory view of a classification map in case a golf club is an iron. It is a figure which shows the example of a display of the simplified classification | category map. FIG. 4 is a schematic diagram for explaining a center of gravity distance L and a center of gravity angle α of a golf club head 16. (A), (b) is a schematic diagram explaining how to obtain | require the gravity center distance L defined with the golf club of this invention. (A), (b) is an explanatory diagram for explaining a centroid distance _{F GL} and face Progressive Deployment _{F P} on the face. (A) is a perspective view of an iron-based golf club 4, (b) is a cross-sectional view of the golf club 4 taken along the line XX ′ shown in (a), and (c) is a grip before mounting. 7 is a cross-sectional view of FIG. (A) is a front view explaining the state which installed the golf club 4 in the normal address position, (b) is a top view. (A), (b), (c) is a figure explaining the relationship between the grip angle β and the orientation of the face surface 1602 of the golf club 4. (A), (b) is explanatory drawing which shows the grip position mark 7C formed in the grip 7. FIG. FIG. 6 is a diagram in which a change in face angle φ at the time of hitting when the lie angle of a golf club is changed is measured. 5 is a flowchart for explaining a classification map creation operation of the golf club selection apparatus 10. 5 is a flowchart for explaining a swing feature display operation and a display chart creation operation by the golf club selection device 10. 4 is a flowchart for explaining a selecting operation of the golf club selecting apparatus 10.

Hereinafter, a golf club selection apparatus to which the golf club swing display method of the present invention is applied and a golf club swing display chart of the present invention will be described.
First, with reference to FIG. 1, elements that affect the ball streak of a golf ball hit by a golf club swung by a golfer will be described.
Assume that the shortest distance between the reference line obtained by projecting the target line connecting the center of the golf ball and the target onto a plane parallel to the horizontal plane and the landing point of the golf ball is the shift amount. can do.
Factors that affect the shift amount include the left and right launch angle, side spin amount, ball initial speed, vertical launch angle, and back spin amount, which will be described later.
Further, it is considered that the left and right launch angle and the side spin amount are determined by the left and right approach angle θ and the hitting face angle φ of the golf club head described later. Strictly speaking, the left and right launch angles and the side spin amount are affected by the position of the hit point on the face surface, but in the present embodiment, the hit point is treated as being the center of the face surface.
The present invention is focused on the fact that the left and right launch angles are correlated with the left and right approach angles and the hitting face angle, and the side spin amount is correlated with the left and right approaching angles and the hitting face angle.
That is, the present invention simulates the movement trajectory of the golf ball using the left and right launch angles and the side spin amount estimated from the correlation based on the measured values of the left and right approach angles and the hitting face angle. Shift amount is obtained, and the quality of the ball muscle is classified and evaluated in consideration of this shift amount.

A schematic configuration of the golf club selection device 10 of the present embodiment will be described.
As shown in FIG. 2, the golf club selection device 10 includes an irradiation photographing unit 11, a control unit 12, and a computer 14.
The irradiation photographing unit 11 photographs the golf club head by stereo photographing from two different directions. In the present embodiment, the irradiation imaging unit 11 constitutes an imaging unit.
The control unit 12 controls the irradiation photographing unit 11 and supplies image data generated by the irradiation photographing unit 11 to the computer 14.
The computer 14 captures data of an image photographed by the irradiation photographing unit 11 and performs signal processing, image processing, and operation analysis, classifies golf swings into types, and selects an optimal golf club.
In FIG. 2, reference numeral P indicates a golfer, and reference numeral 4 indicates a golf club.

Next, a golf club head to be measured by the golf club selection device 10 will be described.
FIG. 3A shows an iron-based golf club head 16A to be measured by the golf club selection apparatus 10, and FIG. 3B shows a wood-based golf club head 16B.
In the following, when the iron-based and wood-based golf club heads are expressed without distinction, they are expressed as a golf club 16.
As shown in FIG. 3A, in the iron-based golf club head 16A, markers 20a, 20b, and 20c are provided on the upper end surface of the golf club head 16 that contacts the face surface (striking surface) 1602 and the hosel portion. Yes. Hereinafter, when the markers 20a, 20b, and 20c are not distinguished, they are referred to as the marker 20.
Further, as shown in FIG. 3B, markers 20a, 20b, and 20c are provided at three locations on the top surface that forms a crown portion that contacts the face surface 1602 of the wood-based golf club head 16B.
For example, the markers 20a, 20b, and 20c have a retroreflective function that reflects the irradiation light of the irradiation light source 22 that will be described later so that the images of the markers 20a, 20b, and 20c can be always identified when the image is taken by the camera 26 that will be described later. It has a configuration. The markers 20a, 20b, and 20c are obtained by cutting a known retroreflective sheet into a predetermined shape, for example.
The markers 20 are provided at three or more locations on the golf club head, and the arrangement positions are set so that these markers 20 form triangular vertices and do not rest on one straight line.
In the example of FIG. 3A, one marker 20 is provided in the hosel part so that the three retroreflective markers do not rest on one straight line.

In this embodiment, in order to obtain the position of the marker as will be described later, for example, three or more marker feature points obtained from the marker are used. A marker feature point is a point that characterizes a marker.
In other words, the marker is provided on the surface of the golf club head 16 and has three or more marker feature points.
For example, as shown in FIG. 3C, when the markers 20a, 20b, and 20c have a circular shape, the center points of the circular shapes are set as marker feature points 21a to 21c, and the positions thereof are set in the image processing unit 32 described later. Extracted.

In the present invention, in addition to the circular markers 20a, 20b, and 20c of the present embodiment shown in FIG. 3C, for example, a regular polygon such as a regular triangle or a square may be used. it can. In this case, the position of the extracted marker feature point can be the center point (centroid point) of the marker in the case of each regular polygon.
Moreover, the shape of each marker does not need to be the same, The thing of the above-mentioned shape can also be combined freely. Also in this case, each marker feature point of each marker is, for example, the center point (center of gravity) of the marker.
Further, when the marker has, for example, an equilateral triangle shape, each of the three vertexes (intersections of the three sides) of the marker may be used as the marker feature point.
The shape of the marker is not particularly limited as long as it has one or a plurality of marker feature points that characterize the marker and that can be uniquely extracted.

Next, the golf club selection apparatus 10 will be specifically described.
4 is a perspective view of the irradiation photographing unit 11, and FIG. 5 is a plan view of the irradiation photographing unit 11.
As shown in FIGS. 4 and 5, the irradiation photographing unit 11 includes an irradiation light source 22, a half mirror 24, a camera 26, a reflection mirror 28, and a base 30. The mirror 24, the camera 26, and the reflection mirror 28 are provided on the base 30.
The irradiation light source 22 irradiates the golf club head 16 as a measurement target.
In the present embodiment, the irradiation light source 22 is composed of a halogen light source or an LED light source, and irradiates continuous light that is continuous in time.
The irradiation light source 22 is disposed so as to irradiate the marker 20 of the golf club head 16 through the half mirror 24.
The half mirror 24 is a mirror having substantially the same light transmittance and reflectance, and transmits half of the light incident on the reflection surface (boundary surface) of the half mirror 24 and reflects the remaining half of the light.
The half mirror 24 is provided such that, when viewed in plan, the optical path of the light emitted from the irradiation light source 22 forms an incident angle of approximately 45 degrees with respect to the reflection surface.
The camera 26 includes a photographic lens, an imaging element that captures a subject image guided by the photographic lens, a signal processing unit that generates an image signal based on an imaging signal generated by the imaging element, and the like. Yes.
When viewed in plan, the camera 26 passes through a position where the optical axis of the photographing lens intersects the optical path of the irradiation light source 22 and the reflecting surface of the half mirror 24, and the optical axis of the photographing lens is the irradiation light source 22. Is formed so as to form an angle of approximately 90 degrees with the optical path of the light.
The reflection mirror 28 has a total reflection surface that totally reflects light, and has a function of adjusting the reflection direction (angle) and position of the total reflection surface.
The reflection mirror 28 reflects the light irradiated from the irradiation light source 22 and reflected by the half mirror 24 on the total reflection surface to irradiate the markers 20a, 20b, and 20c of the golf club head 16, and the markers 20a, 20b, and 20c. The reflection direction and position of the total reflection surface are adjusted so that the reflected light from the light is reflected again by the total reflection surface and guided to the camera 26 through the half mirror 24.

Here, as shown in FIG. 5, in the irradiation photographing unit 11, the irradiation light source 22 emits continuous light toward the reflection surface of the half mirror 24.
Half of the light applied to the reflecting surface of the half mirror 24 is applied to the markers 20a, 20b, and 20c provided on the golf club head to be measured as transmitted light that passes through the position Shm on the reflecting surface. It becomes.
Reflected light (hereinafter referred to as marker reflected light 1a) from the markers 20a, 20b, and 20c travels toward the reflective surface of the half mirror 24.
Here, the marker reflected light 1a travels in the opposite direction to the irradiated light from the irradiation light source 22, and the marker reflected light 1a is reflected light whose optical path matches the irradiation light from the irradiation light source 22. Therefore, the emission angle formed by the light that passes through the reflection surface of the half mirror 24 and is irradiated to the markers 20a, 20b, and 20c with the reflection surface of the half mirror 24, and the marker reflected light 1a is incident on the reflection surface of the half mirror 24. The incident angle is substantially the same.
Thus, the marker reflected light 1a is reflected by the reflecting surface of the half mirror 24 and guided to the photographing lens of the camera 26.

On the other hand, as shown in FIG. 5, the remaining half of the light irradiated on the reflection surface of the half mirror 24 is reflected by the reflection surface of the half mirror 24 and enters the total reflection surface of the reflection mirror 28.
Here, the totally reflected light is irradiated as irradiation light to the markers 20a, 20b, and 20c provided on the golf club head 16 that is a measurement target.
The reflected light from the markers 20a, 20b, and 20c (hereinafter referred to as the marker reflected light 1b) of the irradiated light overlaps with the optical path of the irradiated light that is totally reflected from the reflection mirror 28 and applied to the markers 20a, 20b, and 20c. It goes to the total reflection surface of the reflection mirror 28.
The marker reflected light 1 b is reflected toward the half mirror 24 on the total reflection surface of the reflection mirror 28.
Here, the reflection angle (irradiation angle) at which the light reflected by the reflecting surface of the half mirror 24 and traveling toward the reflecting mirror 28 forms the reflecting surface of the half mirror 24, and the incident light where the marker reflected light 1b enters the reflecting surface of the half mirror 24. The angles are substantially the same.
Further, the marker reflected light 1 b transmitted through the half mirror 24 enters the photographing lens of the camera 26 together with the marker reflected light 1 a reflected by the half mirror 24.
Accordingly, images of the markers 20a, 20b, and 20c by the two reflected lights from the markers 20a, 20b, and 20c that are substantially coincident with the optical paths of the irradiation light irradiated from two different directions are taken by the camera 26.
In the present embodiment, light is irradiated toward the golf club head 16 from two different directions, and an image of the golf club head 16 is taken from two different directions.
In the present invention, the golf club head 16 may be photographed from two or more directions. For example, using a known motion capture system, images of the golf club head 16 are photographed from three different directions by three or more cameras. You can also

In this case, the position and orientation of the reflection mirror 28 are finely adjusted in advance so that the image of the marker reflected light 1b photographed by the camera 26 and the image of the marker reflected light 1a do not overlap.
More specifically, a single image taken by the camera 26 is divided into two in the vertical direction and set as two areas, an upper area and a lower area.
Then, the position and orientation of the reflecting mirror 28 are finely adjusted in advance so that the image by the marker reflected light 1a is taken in the upper area of the image and the image by the marker reflected light 1b is taken in the lower area of the image. Keep it.
Thus, the golf club head 16 is obtained by photographing the images of the markers 20a, 20b, and 20c by the marker reflected light 1a and the images of the markers 20a, 20b, and 20c by the marker reflected light 1b with one camera 26. The images of the markers 20a, 20b, and 20c are taken as stereo images.
Then, with the golf club head 16 moving by the swing, the camera 26 takes images of the markers 20a, 20b, and 20c by multiple exposure, for example, at intervals of 1/2000 seconds.
Thereby, the stereo image of many marker 20a, 20b, 20c is produced | generated by the camera 26 as one image.

  For example, a half prism or various beam splitters can be used as long as it is an optical member that reflects and transmits light incident in both directions on the reflecting surface instead of the half mirror 24. Here, the ratio of the reflectance on the reflecting surface is not particularly limited, but is preferably approximately 1: 1.

Further, the reflection mirror can be configured as follows.
FIG. 6 is a diagram showing an example in which the reflection mirrors 28a and 28b are arranged in addition to the reflection mirror 28 in the optical path formed by the irradiation photographing unit 11 so that the optical path lengths of the marker reflected lights 1a and 1b are aligned.
By providing the reflecting mirrors 28a and 28b in the optical path of the marker reflected light 1a, the optical path from the marker reflected light 1a to the half mirror 24 from the markers 20a, 20b and 20c is lengthened, and the length of the optical path of the marker reflected light 1b is increased. Can be aligned.
That is, by providing the configuration shown in FIG. 6, the optical path length of the marker reflected light 1a is longer than that shown in FIG. 5, and the optical path lengths of the marker reflected lights 1a and 1b to the camera 26 can be made substantially uniform.
By making the optical path lengths close to each other in this way, the camera 26 can take an image of each marker by the marker reflected light 1a, 1b in focus.

  Also in this case, when the light irradiated from two different directions is emitted from the reflection surface of the half mirror 24, the respective emission angles are the two reflected lights reflected from the markers 20a, 20b, and 20c (marker reflected light 1a, 1b) substantially coincides with the incident angle of the corresponding reflected light when entering the reflecting surface of the half mirror 24. Therefore, the two reflected light images of the markers 20a, 20b, and 20c provided on the golf club head 16 can be taken with high contrast.

As shown in FIG. 2, the control unit 12 includes a detector 1202 and a buffer memory 1204.
As shown in FIG. 5, the detector 1202 detects whether or not the golf club 16 has passed at a position on the near side of the shooting range of the camera 26 in the movement locus of the golf club 16. .
As the detector 1202, for example, various conventionally known detectors such as a light reflection type detector that detects the presence or absence of an object by detecting reflected light reflected by the object can be used.
The buffer memory 1204 is a storage device that temporarily stores the image data supplied from the camera 26.
When the detector 1202 detects the passage of the golf club 16, the control unit 12 gives a control command to start the shooting operation to the camera 26 and ends the shooting operation when the golf club 16 is out of the shooting range of the camera 26. A control command is given to the camera 26.
The control unit 12 temporarily stores the image data supplied from the camera 26 in the buffer memory 1204, and then supplies the image data to the computer 14.

The computer 14 has a function of measuring the behavior of the golf club head 16 based on the image data supplied from the control unit 12, classifying the swing of the golf club, and selecting the golf club.
Further, the computer 14 displays the swing characteristics of the golf club and creates a display chart showing the characteristics.
FIG. 7 is a block diagram showing the configuration of the computer 14.
The computer 14 includes a CPU 32, a ROM 34, a RAM 36, a hard disk device 38, a disk device 40, a keyboard 42, a mouse 44, a display 46, a printer 48, an input / output interface 50, and the like connected via an interface circuit (not shown) and a bus line. have.
The ROM 34 stores a control program and the like, and the RAM 36 provides a working area.
The hard disk device 38 stores a dedicated program for measuring the behavior of the golf club head 16, classifying the swing, selecting a golf club, and the like.
The disk device 40 records and / or reproduces data on a recording medium such as a CD or a DVD.
The keyboard 42 and the mouse 44 receive an operation input by the operator.
The display 46 displays and outputs data, and the printer 48 prints and outputs data. The display 46 and the printer 48 output data.
In the present embodiment, the display 46 constitutes the display device of the claims.
The input / output interface 50 exchanges data with an external device.

FIG. 8 is a functional block diagram of the computer 14.
Functionally, the computer 14 includes a signal processing unit 52, an image processing unit 54, an analysis unit 56,
The configuration includes an estimation unit 90, a simulation unit 92, a classification map creation unit 94, a classification unit 58, a selection unit 60, an output unit 62, a storage unit 64, an image forming unit 80, an image output unit 82, and the like.
The signal processing unit 52, the image processing unit 54, the analysis unit 56, the classification unit 58, the selection unit 60, the output unit 62, the image forming unit 80, and the image output unit 82 are executed by the CPU 32 executing the dedicated program. Although realized, these portions may be configured by hardware such as a circuit.

The storage unit 64 is configured by, for example, the hard disk device 38 or the RAM 36, and includes data (CAD data) D1 of the three-dimensional shape model of the golf club head 16, corresponding point position information D2, a classification map D3, and selection information D4. The information including the golf club information D5 is stored.
The information D1 to D5 will be described later.

  For example, only the data values of the portions of the markers 20a, 20b, and 20c can be extracted from the signal processing unit 52 so that the marker feature points 21a, 21b, and 21c can be extracted from the images of the markers 20a, 20b, and 20c in the image. This is a part that performs brightness correction and contrast correction of image data under predetermined processing conditions and further performs gradation processing of a predetermined number of gradations so as to be distinguished from data values of other parts.

The image processing unit 54 is a part that specifies the positions of the marker feature points 21a, 21b, and 21c from the image data of the golf club head 16 during the golf swing, and calculates the behavior of the golf club head 16 using the specified positions. is there.
The image processing unit 54 specifies the marker feature points 21a, 21b, and 21c of the markers 20a, 20b, and 20c and extracts positions in the three-dimensional coordinate system, and 3 of the extracted marker feature points. A calculation unit 54b that calculates time-series data of the position and orientation of the golf club head 16 using the dimensional coordinate position.

The extraction unit 54a identifies image portions of the markers 20a, 20b, and 20c from the image that has been subjected to the gradation processing of a predetermined number of gradations, and extracts the position thereof.
The position coordinates of the marker feature points 21a, 21b, and 21c are obtained for the images of the markers 20a, 20b, and 20c taken from different directions at the same time, which are taken by the irradiation imaging unit 11, and the obtained respective coordinates are obtained. Using the position coordinates of the marker feature points 21a, 21b, and 21c, the position coordinates in the three-dimensional coordinate system that defines the space through which the golf club head 16 passes are obtained, and the marker feature points 21a, 21b, and 21c in the three-dimensional coordinate system are obtained. It is configured to extract a position.

Next, the position coordinates of the marker feature points 21a, 21b, and 21c are obtained for the images of the markers 20a, 20b, and 20c in images taken from different directions by the camera 26 at the same time.
The position coordinates in the three-dimensional coordinate system that define the space through which the golf club head 16 passes using the position coordinates of the respective marker feature points 21a, 21b, 21c thus determined as the position coordinates of the markers 20a, 20b, 20c. The coordinates are obtained, and the positions of the marker feature points 21a, 21b, and 21c in the three-dimensional coordinate system are extracted.
Since the shooting direction of the irradiation imaging unit 11 is known, the information representing the two-dimensional position coordinates in the images shot by these irradiation imaging units 11 is obtained, thereby representing a space through which the golf club head 16 passes. The position in the three-dimensional coordinate system (three-dimensional position coordinates) can be obtained.

  When the images of the markers 20a, 20b, and 20c are taken at a predetermined time interval, for example, a time interval of 1/2000 second, each of the images of the markers 20a, 20b, and 20c every 1/2000 second The time-series data of the three-dimensional position coordinates of the marker feature points (center points of the markers) 21a, 21b, and 21c can be obtained.

In the present embodiment, the irradiation imaging unit 11 is used to photograph from two directions, and the marker feature points 21a, 21b, and 21c to 3 are obtained for the images of the markers 20a, 20b, and 20c obtained from the respective directions. A dimension position coordinate is obtained.
In the present embodiment, as a configuration in which the marker provided on the surface of the golf club head 16 is continuously photographed from two or more different directions, a stereo image is obtained by one camera 26 as shown in FIG. The case where the irradiation imaging | photography part 11 which images is used was demonstrated.
However, as a configuration for continuously photographing the marker provided on the surface of the golf club head 16 from two or more different directions, various conventionally known configurations such as using two or more cameras can be used. is there.

The calculating unit 54b is a part that calculates the position and orientation of the golf club model as time series data from the three-dimensional position coordinates obtained by the extracting unit 54a.
Specifically, in the storage unit 64, in the three-dimensional coordinate system, the three-dimensional shape model corresponding to the arrangement position of the three-dimensional shape model data (CAD data) D1 of the golf club head 16 and the marker feature points. Corresponding point position information D2 indicating the position of the upper corresponding point is stored.
In other words, the three-dimensional shape model data (CAD data) D1 constitutes a three-dimensional shape model reproducing a golf club head, and the corresponding point position information D2 corresponds to the three-dimensional shape model corresponding to three or more marker feature points. The position of the upper corresponding point is shown.
The calculation unit 54b calls the data D1 and the information D2, and the position coordinates of the corresponding points on the three-dimensional shape model in the three-dimensional coordinate system are the three-dimensional position coordinates of the marker feature points extracted by the extraction unit 54a. The position and orientation of the three-dimensional shape model are calculated so as to match, and the time series data of the position and orientation of the golf club head 16 are calculated with the position and orientation as the position and orientation of the golf club head 16. Is done.

FIG. 9A is a schematic diagram showing a time history of movement of the marker at a time interval of 1/2000 second determined from the three-dimensional position coordinates of the marker feature point, and FIG. It is a schematic diagram which shows the behavior of a golf club head based on the time history of the movement of the marker shown in FIG. In the figure, reference numeral 2 indicates a golf ball, and an arrow a indicates the moving direction of the golf club head (the launch direction of the golf ball 2). FIG. 9B shows the golf club head as viewed from above.
9A, with the predetermined position as the origin, the axis parallel to the launch direction of the golf ball 2 is the X axis, the axis perpendicular to the X axis and parallel to the horizontal plane (the ground) is the Y axis, and the axis is perpendicular to the horizontal plane. An XYZ coordinate system with Z as the Z axis is set in advance.
In FIG. 9A, three plot groups M1, M2 to M10 representing the three markers 20a, 20b, and 20c are three marker feature points extracted from markers taken at a time interval of 1/2000 second. The positions of 21a, 21b, and 21c are shown.
Further, by associating the golf club head 16 with the three plot groups M1, M2 to M10 representing the markers, and continuously displaying the movement of the golf club head 16 as shown in FIG. The change in the position of the golf club head 16 and the orientation of the face can be known.
The position of the golf club head 16 represents the position coordinates at the center position of the face surface 1602 as the representative position of the golf club head 16.
The orientation of the face of the golf club head 16 is represented by a normal passing through the center point of the face surface 1602.

The analysis unit 56 uses the time series data of the calculated position and orientation of the golf club head 16, that is, the time series data of the markers 20 a, 20 b, and 20 c, to determine the golf club head 16 immediately before hitting the golf ball 2. The left and right approach angles and the face angle at the time of hitting are obtained.
FIG. 10 is a plan view showing a state in which the golf club head 16 is viewed in plan just before hitting the golf ball 2, FIG. 11 is a schematic diagram for explaining the definition of the left and right approach angle θ, and FIG. It is a schematic diagram to explain.
11 and 12, reference numeral 1610 denotes the center position of the face surface 1602 of the golf club head 16.
As shown in FIGS. 10 and 11, a straight line obtained by projecting a target line connecting the center of the golf ball 2 and the target onto the plane is defined as a reference line L0.
Here, it is assumed that the reference line L0 is parallel to the X axis, and thus the plane is parallel to the X axis and the Y axis and orthogonal to the Z axis.
A straight line obtained by projecting a tangent of the movement locus of the golf club head 16 immediately before hitting the golf ball 2 onto a plane parallel to the horizontal plane is defined as a first straight line L1.
The left / right approach angle θ is an angle formed by the reference line L0 and the first straight line L1.
As shown in FIG. 12, a straight line obtained by projecting a normal line passing through the center point of the face surface 1602 of the golf club head 16 immediately before hitting the golf ball 2 onto the plane is defined as a second straight line L2.
The hit face angle φ is an angle formed by the reference line L0 and the second straight line L2.

That is, the analysis unit 56 obtains the angle formed by the reference line L0 and the first straight line L1 as the left and right approach angle θ from the time series data of the position and orientation of the three-dimensional shape model calculated by the calculation unit 56, The angle formed by the reference line L0 and the second straight line L2 is determined as the face angle φ at impact.
This will be specifically described.
Immediately after the golf ball 2 is hit, the moving speed of the golf club head 16 decreases. Therefore, in the time-series data of the position coordinates representing the movement of the center position 1610 of the face surface 1602 at a certain time interval, the position coordinates immediately before and after the hit. The moving distance of is abruptly shorter than the moving distance at each previous time point.
By utilizing this fact, as shown in FIG. 11, from the time-series data indicating the position coordinates of the golf club head 16, the position coordinates (center position 1610) of the golf club head 16 immediately before the golf ball 2 is hit, It is possible to specify the previous position coordinate in the series data.
A straight line L1 connecting the two position coordinates is a tangent to the movement locus of the golf club head 16.
Similarly, using the above, as shown in FIG. 12, the face of the golf club head 16 immediately before hitting the golf ball 2 is obtained from time-series data indicating the normal line indicating the direction of the golf club head 16. The normal of the surface 1602 can be specified.
The analysis unit 56 thus identifies the tangent line of the movement path of the golf club head 16 immediately before hitting the golf ball 2 and the normal line of the face surface 1602, and thus the left and right approach angle θ in the above-described procedure. Further, the face angle φ upon hitting is obtained.

Since the head speed of the golf club head 16 is normally 30 to 50 m / sec, the golf club head 16 moves by 15 mm to 25 mm at a time interval δ of 1/2000 second, which is an imaging interval by the camera 26.
Therefore, two time-series data (positional coordinate data) are specified in a range 50 mm before the launching direction of the golf ball 2 along the X-axis direction from the center of the golf ball 2.
Therefore, in the present embodiment, the left / right approach angle θ and the hitting face angle φ are obtained based on time-series data in a range of 50 mm from the center of the golf ball 2.
Note that the shooting interval by the camera 26 is not limited to 1/2000 seconds, and it is only necessary to obtain the left and right approach angle θ and the hitting face angle φ based on the obtained time-series data. The shooting interval is arbitrarily set between 1 / 10,000 seconds and 1/500 seconds.
Further, in the present embodiment, the left and right approach angle θ is a positive (plus) angle on the opposite side of the golfer around the reference line L0, and a negative (minus) angle on the golfer side.
Similarly, with respect to the hitting face angle φ, the opposite side of the golfer around the reference line L0 is a positive (plus) angle, and the golfer side is a negative (minus) angle.

The estimation unit 90 estimates the left and right launch angle α and the side spin amount Ss of the golf ball from the measured values of the left and right approach angle θ and the hitting face angle φ.
The left and right launch angle α is an angle formed by a reference line L0 and a line formed by projecting a trajectory of a golf ball immediately after being hit by the golf club head 16 of a golf club swung by a golfer onto a plane.
With respect to the right and left launch angle α, the opposite side of the golfer around the reference line L0 is a positive angle, and the golfer side is a negative angle.
In FIG. 13, the horizontal axis (X-axis) displays the left and right approach angle θ, and the vertical axis (Y-axis) displays the hitting face angle φ from 0 degree to positive and negative in 0.5 degree units. It is a schematic diagram at the time of arrange | positioning the data of angle | corner (alpha).
Note that specific numerical values of the data are omitted. Further, the case where the left and right approach angles θ and the hitting face angle φ are changed in units of 0.5 degrees is exemplified, but the angle unit may be arbitrarily set to be smaller than 0.5 degrees.
The hatched portion has a left and right launch angle α corresponding to 0 degree, the range above the hatched portion is positive (rightward), and the range below the hatched portion has a left and right launch angle α. Negative (left direction) (when golfer is right-handed).

The side spin amount Ss is a spin amount around a vertical line passing through the center of the golf ball 2 of the golf ball 2 immediately after being hit by the golf club head 16 of the golf club swung by the golfer.
The positive or negative side spin amount Ss is positive when viewed clockwise in plan view and negative when counterclockwise.
The estimation unit 90 specifies the left and right launch angle α from the measured values of the left and right approach angle θ and the hitting face angle φ based on the first regression formula, and the left and right approach angle θ based on the second regression formula. The side spin amount Ss is specified from the measured value of the hit face angle φ.
In FIG. 14, the horizontal axis (X-axis) displays the left and right approach angle θ, and the vertical axis (Y-axis) displays the hitting face angle φ from 0 degree to positive and negative in 0.5 degree units. It is a schematic diagram at the time of arrange | positioning the data of quantity Ss.
Note that specific numerical values of the data are omitted. Further, similarly to FIG. 13, the unit of the angle is arbitrary, for example, smaller than 0.5 degrees.
The hatched portion corresponds to zero side spin amount Ss, the range above the hatched portion has a positive side spin amount Ss (slice tendency), and the range below the hatched portion has a negative side spin amount Ss. (Hook tendency) (when golfer is right-handed).

The first regression equation and the second regression equation are created as follows.
The left and right approach angle θ of the golf club head 16 of the golf club actually swung by the golfer and the hitting face angle φ are measured by the procedure as described above.
At that time, the left and right launch angle α and the side spin amount Ss of the golf ball 2 immediately after being hit and hit by the golf club head 16 are measured by a reference measuring instrument. As such a reference measuring instrument, for example, various conventionally known measuring devices as disclosed in Japanese Patent No. 4104384 can be used.
By performing such measurement a plurality of times by a plurality of golfers, data of the left and right approach angle θ, the hitting face angle φ, the left and right launch angle α, and the side spin amount Ss are acquired.
Then, based on the measured values of the left and right approach angle θ, the hitting face angle φ, and the left and right launch angle α, a first regression equation is created that specifies the left and right launch angle α from the left and right approach angle θ and the hitting face angle φ. To do.
Also, a second regression equation is created that specifies the side spin amount Ss from the left and right approach angle θ and the hitting face angle φ based on the measured values of the left and right approaching angle θ, the hitting face angle φ, and the side spin rate Ss. To do.
The first regression equation is expressed as follows, for example.
Left and right launch angle α = left and right approach angle θ × coefficient a1 + striking face angle φ × coefficient b1 + constant c1
The second regression equation is expressed as follows, for example.
Side spin amount Ss = left and right approach angle θ × coefficient a 2 + hit face angle φ × coefficient b 2 + constant c 2
The coefficients a1, a2, b1, b2 and the constants c1, c2 are different depending on the bulge of the club head, the presence / absence (large or small) of roll, and the magnitude of the moment of inertia.
The forms of the first and second regression equations are not limited to those illustrated, and various conventionally known regression equations can be employed.
The estimation unit 90 holds such a first regression equation and a second regression equation. Further, the estimation unit 90 replaces the first regression equation and the second regression equation with a first map that specifies the left and right launch angle α from the left and right approach angle θ and the hitting face angle φ, and the left and right approach angle θ. And a second map for specifying the side spin amount Ss from the hitting face angle φ.

The simulation unit 92 calculates the movement trajectory (ball trajectory) of the golf ball 2 based on the estimated left and right launch angle α and side spin amount Ss, the initial ball velocity V0 of the golf ball 2 and the vertical launch angle β of the golf ball 2. A shift amount ΔS, which is a distance from the reference line L0 to the landing point, is calculated by simulation.
The vertical launch angle β is defined by a line obtained by projecting the trajectory of the golf ball 2 immediately after being hit by the golf club head 16 of the golf club swung by the golfer onto a vertical plane including the reference line L0 and the reference line L0. The angle to make.
Note that fixed values predetermined in accordance with the attributes of the golfer can be used as the initial ball velocity V0 and the vertical launch angle β. The attributes of golfers are classified according to physique (muscular strength) and skill level such as male professional golf, male amateur golfer, female professional golfer, and female amateur golfer.
In the simulation, the backspin amount Sb of the golf ball 2 immediately after being hit by the golf club head 16 of the golf club swung by the golfer may be taken into consideration, or the backspin amount Sb is taken into consideration. This is advantageous in increasing the accuracy of the simulation.
Note that the initial ball speed V0, the vertical launch angle β, and the backspin amount Sb are not fixed values, and simulation is performed using the measured values of the initial ball velocity V0, the vertical launch angle β, and the backspin amount Sb measured by the reference measuring device. It is advantageous to increase the accuracy of the simulation by using these measured values.

The classification map creation unit 94 accumulates data including the left and right approach angle θ, the hitting face angle φ, and the shift amount ΔS, and based on the accumulated data, the X axis indicating the left and right approach angle θ and the X axis The left and right approach angles θ and the hitting angle on a two-dimensional coordinate with the Y axis indicating the face angle φ at the time of hitting and the intersection of the X and Y axes as the left and right approaching angles θ and the hitting face angle φ of zero degrees A classification map D3 that defines a plurality of areas that are demarcated according to the tendency of the spherical muscles specified based on the face angle φ and the shift amount ΔS is created.
The classification map D3 is stored in the storage unit 64. Note that where the classification map D3 is provided is arbitrary.

The relationship between the left / right approach angle θ and the hitting face angle φ and the ball of the golf ball 2 will be described.
As the left / right approach angle θ becomes negative and the absolute value thereof increases, the trajectory of the golf club head 16 shows an outside-in tendency, so that the launched golf ball 2 is launched leftward.
As the left and right approach angle θ becomes a positive value and the absolute value thereof increases, the trajectory of the golf club head 16 shows an inside-out tendency.
The golf ball 2 that is hit as the face angle φ at the time of hitting becomes a negative value and the absolute value thereof becomes larger is more likely to be counter-clockwise when viewed from above.
The golf ball 2 that is hit as the face angle φ at the time of hitting becomes a positive value and the absolute value thereof becomes larger is likely to be subjected to a clockwise side spin as viewed from above.
Thus, the combination of the left / right approach angle θ and the hitting face angle φ affects the left / right of the launch direction of the golf ball 2 and the ease of applying side spin, so that the launched golf ball 2 has a slicing tendency, It becomes a ball of fading tendency, straight tendency, draw tendency and hook tendency.
Here, the slicing tendency means that when a right-handed golfer hits the golf ball 2, the golf ball 2 bends to the right. In the case of a left-handed golfer, the one that turns to the left.
The fade tendency refers to a controlled slicing tendency, in which the landing position of the golf ball 2 launched to the left with respect to the target line returns almost to the target line.
The hook tendency means that when a right-handed golfer hits the golf ball 2, the golf ball 2 bends to the left. In the case of a left-handed golfer, the golfer turns to the right.
The draw tendency refers to a controlled hook tendency, in which the landing position of the golf ball 2 launched to the right with respect to the target line returns almost to the target line.
Further, the straight tendency means that the hit golf ball 2 goes straight without bending.
As described above, the ball streak (trajectory) of the golf ball 2 varies depending on the behavior of the golf club head 16 immediately before hitting the golf ball 2.
Furthermore, it is evaluated that the smaller the shift amount ΔS obtained by the simulation, the closer the landing point is to the reference line L0, and the more preferable the ball point, and the larger the shift amount ΔS, the farther the landing point is from the reference line L0, the less favorable the ball point. The

In the classification map D3, the left and right approach angle θ is set as an X-coordinate value, the hitting face angle φ is set as a Y-coordinate value on a two-dimensional coordinate, and a plane indicated by the two-dimensional coordinate is set as a spherical muscle of the golf ball 2. These are associated with a plurality of corresponding areas (regions).
In other words, the classification map D3 includes an X axis that indicates the left and right approach angle θ and a Y axis that is orthogonal to the X axis and indicates the hitting face angle φ, and the intersection of the X axis and the Y axis is the left and right approach angles θ and A plane indicated by a two-dimensional coordinate axis having a face angle φ of 0 when hit is divided into a plurality of areas (regions) corresponding to the spherical muscles of the golf ball 2 and associated with each other.
The plurality of areas are demarcated according to the tendency of the spherical muscle specified based on the left / right approach angle θ, the hitting face angle φ, and the shift amount ΔS.
The golf club swing is identified by the classification unit 58 using the classification map D3.
FIG. 15 is a schematic diagram for explaining the configuration of the classification map D3. The horizontal axis (X-axis) has a left / right approach angle θ, and the vertical axis (Y-axis) has a striking face angle φ from 0 degrees to 0. The data is displayed in units of 5 degrees, and shift amount ΔS data is arranged at each coordinate point. In the figure, specific numerical values of the data are omitted. In the following, it is assumed that the golfer is right-handed, and in the case of left-handed, the sign is opposite.

More specifically, as shown in FIG. 15, the classification map D3 corresponds to the combination of the left and right approach angle θ and the hitting face angle φ, the slice area A1, the fade area A2, the straight area A3, and the draw area. Five areas corresponding to the ball of the golf ball 2 such as A4 and hook area A5 are associated with each other.
The slice area A1 is an area where the spherical muscle tends to slice, the fade area A2 is an area where the spherical muscle tends to fade, the straight area A3 is an area where the spherical muscle tends to be straight, and the draw area A4 is a trend where the spherical muscle tends to draw. The hook area A5 is an area where the spherical muscle tends to hook.
In other words, depending on whether the combination of the left and right approach angle θ and the hitting face angle φ corresponds to any of the areas A1 to A5, the golf club swing type is slice type, fade type, straight type, draw type, hook type Specific to any type.
That is, the classification unit 58 corresponds to any of a plurality of types in which the golf swing is stored in the classification map D3 based on the left and right approach angle θ and the hitting face angle φ obtained by the analysis unit 58. To identify.

The slice area A1, fade area A2, straight area A3, draw area A4, and hook area A5 on the classification map D3 are determined as follows.
FIG. 16 is a schematic diagram illustrating each area and boundary line.
FIG. 16 shows the horizontal approach angle θ on the horizontal axis (X axis) and the face angle φ at impact on the vertical axis (Y axis) in units of 0.5 degrees from 0 degree to positive and negative, respectively, as in FIG. Data of the shift amount ΔS is arranged at each coordinate point. In the figure, specific numerical values of the data are omitted.
The hatched portion indicated by the symbol LA is the first boundary line, the landing point matches the reference line L0, and the shift amount ΔS is zero.
Further, the hatched portion indicated by reference numeral M1 indicates a range where the landing point is located on the right side with respect to the reference line L0 and the shift amount ΔS is greater than 0 and equal to or less than 10 yards.
The hatched portion indicated by reference numeral M2 indicates a range where the landing point is located on the left side with respect to the reference line L0 and the shift amount ΔS is 0 or more and 10 yards or less.
A portion indicated by a symbol LB is the second boundary line, and the side spin amount Ss corresponds to 0 rpm (straight area A3). The second boundary line LB intersects with the first boundary line LA on the two-dimensional coordinates indicated by the X axis and the Y axis, and has a larger positive slope than the first boundary line LA. ing.
A portion indicated by a symbol M3 indicates a range in which the side spin amount Ss is a positive value and is from 0 rpm to 500 rpm.
A portion indicated by a symbol M4 indicates a range in which the side spin amount Ss is a negative value and is from 0 rpm to 500 rpm.
The upper limit value and lower limit value of the shift amount ΔS and the upper limit value and lower limit value of the side spin amount Ss are not limited to the above numerical values, and are arbitrarily set.

Of the two regions sandwiched between the first boundary line LA and the second boundary line LB, the region located closer to the positive direction of the X axis and the Y axis is the draw area A4.
Of the two regions sandwiched between the first boundary line LA and the second boundary line LB, the region located closer to the negative direction of the X axis and the Y axis is the fade area A2.
A region located on the positive side of the Y axis from the draw area A4 and the fade region A2 is the slice area A1.
The area located on the negative direction side of the Y axis from the draw area A4 and the fade area A2 is the hook area A5.
The portion of the second boundary line LB is the straight area A3.

In this embodiment, in addition to classifying the ball muscles into the above five types, the ball muscles are evaluated by the shift amount ΔS.
First, the range of the shift amount ΔS of 0 yard ± 10 yards is defined as a good ball line.
Therefore, in FIG. 16, a region that falls within the range of 0 yard ± 10 yards, that is, a region indicated by symbols M1, LA, and M2 is evaluated as a good ball.

  In addition, even if the shift amount ΔS is within ± 10 yards, the flying distance is reduced when the side spin amount Ss is large and the movement locus of the golf ball 2 is greatly curved. Areas indicated by M1, LA, M2, and areas indicated by reference numerals M3, M4, that is, a range where the shift amount ΔS is within ± 10 yards and the side spin amount Ss is 0 rpm or more and 500 rpm or less is evaluated as a better ball muscle. To do.

Further, even when the shift amount ΔS is within ± 10 yards and the spin amount is 500 rpm or less, the movement trajectory of the golf ball 2 when viewed in a plane once once draws a convex shape on the right side (left side) of the reference line L0. When the golf ball reaches a point on the left side (right side) on the opposite side beyond the reference line L0, the technical evaluation as a golf game is lower than when landing without exceeding the reference line L0.
Therefore, when the movement trajectory of the golf ball 2 when viewed in plan is bent to draw a convex shape on the right side (left side) of the reference line L0 and landed on the same right side (left side) without exceeding the reference line L0 Will give good evaluation of the ball muscles.
In FIG. 16, the regions indicated by reference signs N <b> 1 and N <b> 2 have a shift amount ΔS of 0 yard ± 10 yards and a side spin amount Ss of 0 rpm to 500 rpm. Corresponds to the ball muscle that landed beyond the reference line L0.
Therefore, in the areas indicated by reference numerals M1, L1, and M2 in FIG. 16 and the areas indicated by reference numerals M3 and M4, the remaining areas O and P (except for the areas N1 and N2 that are spherical streaks that exceed the reference line L0 are included. The area surrounded by the bold line) is evaluated as the best bulb.
In the present embodiment, it is assumed that the area indicated by the symbols O and P among the fade area A2, the draw area A4, and the straight area A3 is evaluated as the best ball line.
It should be noted that which of the following three types of evaluation is adopted is arbitrary, but the area occupied on the classification map D3 by the area of the ball muscle evaluated as good in the order of 1), 2) and 3) is acceptable. It becomes smaller and evaluation becomes more severe.
1) Evaluate the region indicated by the symbols M1, L1, and M2 (side spin amount Ss in the range of 0 rpm to 500 rpm) as a good ball.
2) Spherical muscles in the areas indicated by the symbols M1, L1, and M2 and the regions indicated by the symbols M3 and M4 (the range in which the shift amount ΔS is within ± 10 yards and the side spin amount Ss is 0 rpm or more and 500 rpm or less) Evaluate as
3) The remaining areas O and P excluding the areas N1 and N2, which are the areas indicated by the symbols M1, L1, and M2, and the areas indicated by the symbols M3 and M4 and that exceed the reference line L0 are used as good spherical muscles. evaluate.

Referring to FIG. 15, hatching is applied to a portion that is evaluated as having good spherical muscles in the fade area A2, the draw area A4, and the straight area A3. In order to simplify the drawing, the straight area A3 is shown by a straight line.
Note that the first boundary line LA, the second boundary line LB, and the areas A2, A3, and A4 vary depending on the golf club head 16, the golfer's attributes, and the like. This will be described with reference to FIGS. 17 to 22, the first boundary line LA is not shown.
FIGS. 17 to 19 are examples of a classification map D3 when the golf club is a driver. FIG. 18 shows a male professional golfer (initial speed V0: 70 m / s, vertical launch angle β: 13 degrees, backspin amount Sb: 3000 rpm. 19 is a male amateur (initial speed V0: 60 m / s, vertical launch angle β: 15 degrees, backspin amount Sb: 2500 rpm), and FIG. 20 is a female amateur (initial speed V0: 45 m / s, vertical launch angle β: 17). Degree, backspin amount Sb: 2200 rpm).

20 to 22 are examples of the classification map D3 when the golf club is a 7 iron. FIG. 20 shows a male professional golfer (initial speed V0: 53 m / s, vertical launch angle β: 18 degrees, back spin amount Sb. 21 is a male amateur (initial speed V0: 46 m / s, vertical launch angle β: 19 degrees, backspin amount Sb: 5000 rpm), FIG. 22 is a female amateur (initial speed V0: 35 m / s, vertical launch angle β). : 20 degrees, backspin amount Sb: 4000 rpm).
As shown in FIGS. 17-22, it turns out that the shape and area of each area differ in a driver and the 7th iron.
In addition, as the ball initial velocity V0 increases, the area of the area evaluated as a good spherical muscle is narrowed, and the range of the left and right approach angle θ and the hitting face angle φ required to obtain a good spherical muscle tends to be narrowed. I understand that.

In addition, since the position and area of each area on the classification map D3 change due to the cause caused by the selection device 10, the classification map D3 is created according to the selection device 10.
Strictly speaking, the inclinations of the first and second boundary lines LA and LB slightly change due to the influence of the bulge of the face surface 1602 of the golf club head 16 and the moment of inertia of the golf club head 16.

FIG. 23 is a diagram illustrating a display example of a simplified classification map D3.
In FIG. 23, the fade area A2 and the draw area A4 are shown in an oval shape for the convenience of visually simplifying and displaying each area, and the fade area A2 and the draw area A4 partially overlap, so Although the area A4 protrudes outside the first and second boundary lines LA and LB, strictly speaking, as shown in FIG. 15 described above, the fade area A2, the draw area A4, the first and second areas The boundary lines LA and LB do not overlap each other.
In addition, an arrow F1 indicating the moving direction of the golf club head 16 with respect to the reference line L0 is shown in the upper part of FIG. 23, and the left and right approach angle θ is schematically shown.
Further, on the left side of FIG. 23, an arrow F2 indicating the direction of the face surface 1602 of the golf club head 16 is shown, and the hitting face angle φ is schematically shown.
Further, the areas of the fade area A2, the draw area A4, and the straight area A3 increase or decrease depending on which of the three types of evaluation described above is adopted.

  The classification unit 58 uses the classification map D3 to identify which type of golf club swing falls into a predetermined type based on the left / right approach angle θ and the hitting face angle φ. To do.

The selection unit 60 selects an optimal golf club according to the type specified by the classification unit 58.
In the present embodiment, selection information D4 in which a swing type of a golf club and a golf club optimum for the type are associated is prepared in advance. Specifically, the selection information D4 is stored in the storage unit 64. ing. Note that where the selection information D4 is stored is arbitrary.
The selection information D4 is information in which the swing type of the golf club is associated with the golf club most suitable for the type.
The format of the selection information D4 is arbitrary, for example, including a data table in which a golf club swing type and a golf club optimum for the type are associated with each other.
That is, the golf club most suitable for the type is a golf club that is advantageous in correcting the spherical muscle when the golf ball 2 is hit with the type of swing.
The selection unit 60 selects an optimal golf club from the selection information D4 based on the golf club swing type specified by the classification unit 58.

As the golf club selected by the selection unit 60 (in other words, the golf club associated with the swing type of the golf club in the selection information D4), it is preferable that the center of gravity distance and the center of gravity angle of the golf club head 16 are varied. What is obtained by setting is used.
That is, the golf club head 16 that is optimal for each type described above is configured so that at least one of the center-of-gravity distance and the center-of-gravity angle is different.

As shown in FIG. 24, the center of gravity distance of the golf club head 16 is the shortest distance from the center of gravity G of the golf club head 16 to the center axis S (shaft axis) of the golf club shaft or an extension of the center axis S. When a straight line is defined, this is the distance L of this shortest straight line.
The center-of-gravity angle means that the golf club head 16 is placed on the horizontal plane according to the set lie angle, and the shortest straight line and the central axis S of the golf club shaft or an extension line of the central axis S are set from the vertical direction to the horizontal plane. An angle α formed between the shortest straight line and the central axis S of the golf club shaft or an extension line of the central axis S when projected toward the front. That is, the barycenter angle α is an angle representing the direction of the shortest straight line.
And it can be made suitable for each said type by changing the value of the gravity center distance L into large and small according to each said type.
In other words, the type corresponding to the slice area A1 selects the golf club head 16 with a short center of gravity distance L (short), and the type corresponding to the hook area A5 selects the golf club head 16 with a large center length L (long). .
In order to clarify the range of difference in the center of gravity distance L between the golf club heads 16, the difference in center of gravity distance L between the golf club heads 16 is preferably 3 mm to 10 mm.
Further, by changing the value of the barycentric angle α to large or small according to each type, it is possible to make it suitable for each type.
In other words, the type corresponding to the slice area A1 selects the golf club head 16 having a large center of gravity angle α, and the type corresponding to the hook area A5 selects the golf club head 16 having a small center of gravity angle α.

The above-described center-of-gravity distance L can be obtained as follows, for example.
As shown in FIG. 25A, the measurement is performed by a seesaw type balance 70 that can swing in the direction of an arrow U around a fulcrum 71.
The balance 70 has a shaft pin 72 having a fit with no gap with respect to the hosel hole of the golf club head 16. Yes.
As shown in FIG. 25 (b), the center of gravity distance L of the center of gravity G of the golf club head 16 from the golf club shaft axis is measured by mounting and fixing the golf club head 16 having a mass W on the shaft pin 72. Then, a precision balance is placed at a predetermined position (L ′) so that the arm 73 is horizontally balanced, and the load when the balance 70 is suspended is measured.
Then, the direction of the golf club head 16 attached to the shaft pin 72 is adjusted so that this load is maximized, and the load W ′ when it is maximized is obtained. L = (W ′ × L ′) / W is calculated. This calculated value is the centroid distance L.

The case where the wood-based golf club head 16 that is optimal for each type is prepared and selected by adjusting the center-of-gravity distance L and the center-of-gravity angle α has been described above. The distance _FGL can also be used.

Here, “the gravity center distance F _GL on the face surface 1602” will be described.
As shown in FIGS. 26A and _{26B, the} “center of gravity distance F _GL on the face surface 1602” is a point g where a perpendicular line L1 perpendicular to the face surface 1602 passing through the center of gravity G intersects the face surface 1602 and golf. This is the shortest distance between the center axis S of the club shaft or an extension line of the center axis S projected onto the face surface 1602 or a surface obtained by extending the face surface 1602.
The point g can be detected using a conventionally known center-of-gravity measuring instrument. For example, the method described in paragraphs 0028 to 0030 of Japanese Patent No. 4233886 can be used. In short, the detection method of the point g is arbitrary as long as the perpendicular L1 perpendicular to the face surface 1602 passing through the center of gravity G intersects the face surface 1602.
Then, the value of the centroid distance F _GL on the face surface 1602 in response to each type of the large, by changing the small, may be suitable to each type of the.
Words the type corresponding to the slice area A1 is smaller centroid distance _{F GL} on the face surface 1602 (short) selects a golf club head 16, the type corresponding to the hook area A5 is the centroid distance _{F GL} on the face surface 1602 A golf club head 16 having a large (long) is selected.

  Furthermore, as described in JP 2006-247045 A, when the grip angle β in the golf club is determined, the grip angle β can be used instead of the barycentric angle α.

Here, “grip angle β” will be described.
FIG. 27A is a perspective view of an iron-based golf club 4.
The golf club 4 includes a golf club shaft 5, a golf club head 16 attached to the front end portion of the golf club shaft 5, and a grip 7 attached to the rear end portion of the golf club shaft 5.
FIG. 27B is a cross-sectional view of the golf club 4 taken along the line XX ′ shown in FIG.
A grip 7 is provided so as to surround the golf club shaft 5, and a partially protruding protrusion is provided on a part of the outer periphery of the grip 7.
This protrusion is provided at the same circumferential position in the longitudinal direction of the golf club shaft 5 to form a back line 7A.
As shown in FIG. 27 (c), the back line 7 A has a flat portion 7 B formed on a part of the inner peripheral surface of the grip 7 before mounting. By mounting the golf club shaft 5, the back line 7 A is It is formed in a convex shape.
The back line 7 </ b> A is a specific part for specifying the mounting direction when the grip 7 is mounted on the golf club shaft 5.
The grip angle β is information indicating the mounting direction of the specific part (back line 7A) with respect to the direction of the face surface 1602 of the golf club head 16.
The specific portion is not limited to the back line 7A, and may be a visually recognizable index formed on the surface of the golf club shaft 5 or the surface of the grip 7.
For example, as shown in FIGS. 30A and 30B, a grip position mark 7 </ b> C is formed on the surface of the grip 7 to display a grip position where the thumbs of the left and right hands are applied when the grip 7 is gripped. In this case, the grip position mark 7C may be a specific part.

FIG. 28A is a front view for explaining a state in which the golf club 4 is installed at a normal address position, and FIG. 28B is a plan view.
FIGS. 29A, 29B, and 29C are diagrams illustrating the relationship between the grip angle β and the orientation of the face surface 1602 of the golf club 4.
Specifically, as shown in FIGS. 28A and 28B, the grip angle β is set by placing the golf club 4 on a horizontal reference plane B (horizontal plane) according to the lie angle, and the grip 7 and the golf club. In the cutting plane when the shaft 5 is cut perpendicularly to the central axis S, as shown in FIGS. 29 (a), (b), and (c), the circumference around the golf club shaft 5 provided with the back line 7A When a straight line L2 passing from the position through the central axis S and a projection line H1 when a horizontal line (a straight line parallel to the score line) on the face surface 1602 of the golf club head 16 is projected onto the cutting plane are defined, An angle formed by the direction of L2 with respect to the direction of the projection line H1.
Therefore, when the straight line L2 and the projection line H1 are parallel, the grip angle β is 0 degree.

The horizontal line on the face surface 1602 of the golf club head 16 refers to a straight line on the face surface 1602 parallel to the reference surface B in a state where the golf club 4 is installed at a normal address position (installed according to the lie angle).
This horizontal line is generally substituted by a score line 1630 or a straight line parallel to the score line 1630.
The score line 1630 is set to indicate a reference for the face surface 1602.
If the score line 1630 is not linear, for example, a line parallel to the reference plane B is marked on the face surface 1602 on the face surface 1602 in a state where the score line 1630 is installed at a normal address position. It can be a horizontal line.
Here, setting the golf club 4 at the normal address position means that the golf club head 16 is set at the lie angle and the leading axis S and the reading are as shown in FIGS. 28 (a) and 28 (b). This means that the edge 1620 is installed so as to be parallel to each other and so as to be parallel to the score line 15.
Further, when the score line 1630 is not linear, the fact that the central axis S and the leading edge 1620 are parallel to each other indicates a state in which the face angle is 0 degree.

In the present embodiment, the grip angle β is defined as a negative (minus) angle when the face surface 1602 closes around 0 degrees, and a positive (plus) angle when the face surface 1602 opens.
By changing the sign of the grip angle β and the magnitude of the absolute value according to each type, the grip angle β can be made suitable for each type.
In other words, the type corresponding to the slice area A1 selects the golf club head 16 having a negative grip angle β (with the face surface 1602 closed), and the type corresponding to the hook area A5 has a positive grip angle β (the face surface). The golf club head 16 (with 1602 open) is selected.
When a golfer grips a golf club, the golfer grips the golf club with reference to a mark or display displayed on the grip. Therefore, by changing the grip angle β, the orientation of the golf club head 16 facing the face surface 1602 is changed. Further, the moving direction of the face surface 1602 immediately before hitting the golf ball 2 changes. For this reason, the optimal golf club can be provided according to each said type.

In addition, as the golf club selected by the selection unit 60, a golf club obtained by setting various face progressions of the golf club head 16 is preferably used.
As shown in FIG. 26, the face progression F _P, the distance from the center axis S to the most advanced position C of the golf club head 16. That is, face progression F _P is the distance from the central axis S to the leading edge is a place where the face surface 1602 and the sole portion 1604 is in contact.
By changing the magnitude of the face progression F _P depending on the type of the can to be suitable for each type of the.
In other words, the type corresponding to the slice area A1 is selected golf club head 16 face progression F _P is small, the type corresponding to the hook area A5 is selected golf club head 16 face progression F _P is large.
The golf club head 16 having a small face progression is called a gooseneck or offset.

Further, when the golf club selected by the selection unit 60 is a wood type, a golf club obtained by setting various face angles of the golf club head 16 is preferably used.
In the present embodiment, the face angle is defined as a negative (minus) angle in the direction in which the face surface 1602 closes around 0 degree, and a positive (plus) angle in the direction in which the face surface 1602 opens.
That is, by changing the sign of the face angle of the golf club head 16 and the magnitude of the absolute value according to each type, the golf club head 16 can be made suitable for each type.
In other words, the type corresponding to the slice area A1 selects the golf club head 16 having a negative face angle (the face surface 1602 is closed), and the type corresponding to the hook area A5 has a positive face angle (the face surface 1602). The golf club head 16 is selected.
In other words, the type corresponding to the slice area A1 may be selected as the golf club head 16 having a hook face, and the type corresponding to the hook area A5 may be selected as the golf club head 16 having a slice face.

Further, when the golf club selected by the selection unit 60 is an iron type, a golf club obtained by setting various lie angles of the golf club head 16 is preferably used.
In other words, the type corresponding to the slice area A1 selects the golf club head 16 having an upright lie angle, and the type corresponding to the hook area A5 selects the golf club head 16 having a flat lie angle.

As the golf club selected by the selection unit 60, a golf club obtained by setting various lie angles of the golf club is used.
More specifically, FIG. 31 is a diagram in which a change in the face angle φ at the time of hitting when the lie angle of the golf club is changed is measured. As a golf club, a driver, a 5 iron, a 7 iron, No. 9 iron and sand wedge are measured.
That is, since the loft angle is set for the golf club head 16, the orientation of the face surface 1602 (the direction of the normal of the face surface 1602) changes to the left and right as the lie angle changes. Also, the change in the direction of the normal of the face surface 1602 is larger as the club has a larger loft angle.
Therefore, when using a golf club with an adjustable lie angle, select a golf club that can correct the ball muscle by adjusting the lie angle and adjusting the face angle φ at the time of hitting by the following procedure. Can do.
1) Make a test shot with a standard lie angle golf club.
2) Plot the measurement point P1 on the classification map D3 as shown in FIG.
In this case, since the measurement point P1 corresponds to the hook area A5, the hitting face angle φ may be adjusted in the + direction so that the measurement point P1 can move to the draw area A4.
3) Therefore, when the lie angle is adjusted in the direction to lower the toe side, the normal of the face surface 1602 turns to the right side in relation to the loft angle, in other words, the face angle φ at the time of impact can be changed in the + direction.
4) Try a golf club with an adjusted lie angle.
Again, as shown in FIG. 23, the measurement point P2 after the lie angle adjustment is plotted on the classification map D3.
It is confirmed that the ball muscle has entered the draw area A4 (optimum trajectory area) and the ball muscle has been corrected.
That is, in the above procedure, the selection unit 60 selects a golf club having a lie angle sufficient to correct the ball muscle by adjusting the face angle φ at the time of hitting in the + direction (or − direction).
In the upper part of FIG. 23, when the lie angle of the golf club head 16 is adjusted, a schematic diagram showing the degree of adjustment of the lie angle and the change of the face angle φ at the time of hitting are shown by the positions of the measurement points P1 and P2. A figure has been added.

  Also, for these golf clubs, information indicating that the golf club is optimal for each of the above-mentioned types, that is, information on the type to be classified, is presented on a display medium such as a sticker or tag attached to the golf club. It is preferable. A golfer can also select a golf club suitable for his / her golf swing from a large number of golf clubs using the display medium as a guide.

The output unit 62 displays information for specifying the golf club selected by the selection unit 60, that is, the golf club information D5 on the screen by the display 46, or prints it on a print medium by the printer 48 and outputs it. Alternatively, the golf club information D5 is output to a disk-shaped recording medium via the disk device 40, or is output to an external device via the input / output interface 50.
The golf club information D5 is stored in advance in the storage unit 64, and the output unit 62 reads out the golf club information D5 corresponding to the golf club from the storage unit 64 based on the golf club selected by the selection unit 60. Output. It is arbitrary where the golf club information D5 is stored.
The golf club information includes various information such as a golf club product name, product number, various specifications, an external view, and a photograph.

The image forming unit 80 displays on the basis of the data of the classification map D3 read from the storage unit 64 and the data of the measurement points that are the data of the left and right approach angles θ and the hitting face angle φ supplied from the analysis unit 56. Image data for printing and image data for printer output are formed.
The measurement point may be one data obtained by one measurement or may be an average value of N data obtained by N measurements (N is a natural number of 2 or more). Good.
If the measurement point is an average value of N pieces of data, it is advantageous in suppressing variation of the measurement point.
Note that such calculation of the average value may be performed by the analysis unit 56 or the image forming unit 80, and where it is performed is arbitrary.

The image output unit 82 supplies the display display image data supplied from the image forming unit 80 to the display 46 to display the swing characteristics of the golf club on the display screen of the display 46.
The image output unit 82 also supplies the printer output image data supplied from the image forming unit 80 to the printer 48, thereby printing the swing characteristics of the golf club on paper as a recording medium. Create a display chart for.

Here, the display screen displayed on the display 46 by the image forming unit 80 and the image output unit 82 and the display chart created by the printer 48 are as illustrated in FIG.
The display screen generated by the display screen of the display 46 and the printer 48 includes a two-dimensional coordinate axis including an X axis indicating the left and right approach angle θ, and a Y axis orthogonal to the X axis and indicating the face angle φ at impact. One boundary line LA, second boundary line LB, various areas A1 to A5, and measurement points are displayed.

Next, the operation of the golf club selecting apparatus 10 will be described.
The selection device 10 generates the classification map D3, displays the swing characteristics of the golf club by the golfer on the display, generates the display chart showing the swing characteristics, and selects the golf club. And do.
Hereinafter, an operation for creating the classification map D3, a swing feature display operation and a display chart creation operation, and a golf club selection operation will be sequentially described.

First, an operation for creating the classification map D3 will be described.
FIG. 32 is a flowchart for explaining the creation operation of the classification map D3 of the golf club selection apparatus 10.
When the golfer swings the golf club and hits the golf ball 2 placed on the tee, the control unit 12 causes the detector 1202 to detect the golf club head 16, thereby causing the camera 26 to perform a shooting operation and image data. Are stored in the buffer memory 1204 (step S100: photographing step).

  The image data is supplied to the image processing unit 54 via the signal processing unit 52, and each marker feature point is extracted from the image data by the extraction unit 54a (step S102: extraction step).

  The calculation unit 54b is a three-dimensional shape data D1 (three-dimensional shape model) that reproduces the golf club head 16 stored in the storage unit 64, and a three-dimensional shape model corresponding to three or more marker feature points. Based on the corresponding point position information D2 indicating the position of the corresponding point, the position of the corresponding point matches the position in the three-dimensional coordinate system of the three or more marker feature points extracted by the extraction unit 54a. By determining the position and orientation of the three-dimensional shape model, time-series data of the position and orientation of the three-dimensional shape model that reproduces the behavior of the golf club head 16 is calculated (step S104: calculation step).

Next, the analysis unit 56 obtains the left / right approach angle θ and the hitting face angle φ from the time-series data of the position and orientation of the three-dimensional shape model (step S106: analysis step).
Next, the estimation unit 90 estimates the left and right launch angle α and the side spin amount Ss from the measured values of the left and right approach angle θ and the hitting face angle φ (step S108: estimation step).
The estimation of the left and right launch angle α and the side spin amount Ss in the estimation step is performed by the first regression equation for specifying the left and right launch angle α from the left and right approach angle θ and the hitting face angle φ, the left and right approach angle θ and the impact. The second regression equation for specifying the side spin amount Ss from the hour face angle φ is used.
Next, the simulation unit 92 determines the movement trajectory of the golf ball 2 based on the estimated left and right launch angle α and the side spin amount Ss, the initial ball speed of the golf ball 2, and the vertical launch angle of the golf ball 2. A shift amount ΔS, which is a distance from the reference line L0 to the landing point, is calculated by simulation (step S110: simulation step).

By repeating steps S10 to S20, data including the left and right approach angle θ, the hitting face angle φ, and the shift amount ΔS is accumulated (step S112: classification map D3 creation step).
The X-axis indicating the left-right approach angle θ and the Y-axis perpendicular to the X-axis and indicating the face angle φ at impact are provided, and the intersection of the X-axis and the Y-axis is defined by the left-right approach angle θ and the face angle φ at impact. A two-dimensional coordinate axis set to zero degrees is set, and a plurality of boundaries separated according to the tendency of the spherical muscles specified based on the accumulated left and right approach angle θ, the hitting face angle φ, and the shift amount ΔS are set. By setting the areas A1 to A5 on the two-dimensional coordinate axis, a classification map D3 in which various areas are defined is created (step S114: classification map D3 creation step). The created classification map D3 is stored in the storage unit 64.
The creation of the classification map D3 is thus completed.
The classification map D3 is created for each golfer attribute (male professional golfer, male amateur, female professional golfer, female amateur) and for each golf club type (driver, iron, count). The classification map D3 corresponding to the attribute and the type of golf club can be created.

Next, a display operation of swing characteristics and a display chart creation operation by the golf club selection device 10 will be described.
FIG. 33 is a flowchart for explaining the swing feature display operation and display chart creation operation by the golf club selection apparatus 10.
Steps S200 to S206 are the same as steps S100 to S106 in FIG.

  In step S208, the image forming unit 80 converts the data of the classification map D3 read from the storage unit 64 and the data of the measurement points supplied from the analysis unit 56 (data of the left and right approach angle θ and the hitting face angle φ). Based on this, image data for display is formed and image data for printer output is formed (step S208).

The image output unit 82 displays the two-dimensional coordinate axes including the X axis and the Y axis on the display screen of the display 46 based on the display display image data supplied from the image forming unit 80 (step S210: coordinate axis display). Step).
Next, the image output unit 82 displays the first boundary line LA and the second boundary line LB on the display screen of the display 46 based on the image data for display display supplied from the image forming unit 80 ( Step S212: boundary line display step).

  Next, the image output unit 82 displays a slice area A1, a fade area A2, a straight area A3, a draw area A4, a hook on the display screen of the display 46 based on the display display image data supplied from the image forming unit 80. Area A5 is displayed (step S214: various area display step). In other words, the image output unit 82 displays a plurality of areas A1 to A5 that are divided according to the tendency of the spherical muscles.

Next, the image output unit 82 displays the measurement points on the display screen of the display 46 based on the display display image data supplied from the image forming unit 80 (step S216: measurement point display step).
As a result, the swing feature is displayed on the display screen of the display 46, as shown in FIG.

Next, the image output unit 82 supplies the printer output image data supplied from the image forming unit 80 to the printer 48, thereby printing the swing characteristics of the golf club on a recording medium, thereby displaying a swing display chart. Create (step S218).
As a result, as shown in FIG. 23, a display chart showing the swing characteristics is output.
When displaying each area or outputting a display chart, a plurality of classification maps D3 are prepared in advance according to the golfer's attributes, and the classification map D3 corresponding to the customer's attribute is selected to select each area. If displayed, the swing characteristics reflecting the customer attributes can be presented, which is advantageous in ensuring customer satisfaction.

Next, the golf club selection operation will be described.
FIG. 34 is a flowchart for explaining the selecting operation of the golf club selecting apparatus 10.
Steps S300 to S306 are the same as steps S100 to S106 in FIG.

  In step S308, the classification unit 58 uses the classification map D3 to determine which type of golf club swing is a predetermined type based on the left / right approach angle θ and the hitting face angle φ. (Step S308: classification step).

  Next, the selection unit 60 selects a golf club corresponding to the specified type using the selection information D4 (step S310: selection step).

Next, the output unit 62 reads out and outputs the golf club information D5 corresponding to the selected golf club from the storage unit 64 (step S312: output step).
Accordingly, a golf club suitable for the golfer's swing type is selected.

Accordingly, the shift amount ΔS estimated based on the left and right approach angle θ and the hitting face angle φ of the golf club head 16 immediately before hitting the golf ball 2 and estimated from the left and right approaching angle θ and the hitting face angle φ is obtained. In consideration of this, the type of golf swing is classified, which is advantageous for more accurately classifying the type of golf swing affecting the spherical muscles such as hooks and slices of the golf ball 2.
And since a golf club is selected based on the classification result, it is advantageous in selecting an optimum golf club for a golfer.

According to the swing display method of the golf club of the present embodiment, the following operational effects are achieved.
In consideration of the two-dimensional coordinate axis indicating the left / right approach angle θ and the hitting face angle φ and the shift amount ΔS estimated from the left / right approaching angle θ and the hitting face angle φ on the display screen of the display 46, A plurality of areas that are divided according to the tendency and a measurement point that measures the behavior of the golf club head 16 when the golfer actually swings are displayed.
Therefore, it is advantageous in providing a swing feature that affects the spherical muscles such as slices and hooks in a simple and easy-to-understand manner based on which of the plurality of areas the measurement point is located.

In particular, in the present embodiment, a slice area A1, a fade area A2, a straight area A3, a draw area A4, and a hook area A5 are displayed as a plurality of areas. Based on which area the measurement point is located on It is even more advantageous in providing swing features that affect the ball muscles such as slices and hooks in a simple and easy-to-understand manner.
Also, how to correct each of the left and right approach angles θ and the hitting face angle φ by grasping the deviation of the measurement points with respect to the fade area A2 and the draw area A4 which are ideal swings. This is advantageous in understanding the improvements.
In particular, it is possible to easily provide the golfer with the results of practice at a golf driving range or the like, which is advantageous in effectively carrying out the practice of the golfer.
Further, if measurement is performed using a plurality of types of golf clubs at a golf shop or the like, the characteristics of the golf clubs can be specifically compared. Therefore, when a golfer purchases a golf club, the golf club can be accurately evaluated, which is advantageous in promoting sales.
Alternatively, when using a conventional product and a new product to measure when a new product of a golf club is publicized, it is possible to show the improvements of the new product compared to the conventional product, which is advantageous in increasing the effectiveness of the publicity. It becomes.

In the present embodiment, the portion corresponding to the predetermined shift amount ΔS or less of the draw area A4, the fade area A2, and the straight area A3 is displayed as an area of a good ball, so that the swing feature can be accurately determined. It is advantageous in providing.
Further, in the present embodiment, a portion corresponding to a predetermined side spin amount Ss or less of the draw area A4, the fade area A2, and the straight area A3 is displayed as a good spherical muscle area, so that the swing feature is accurately determined. It will be advantageous in providing.

  In the present embodiment, since the first regression equation and the second regression equation are used when specifying the left and right launch angle α and the side spin amount Ss in the estimation step, the left and right launch angle α and the side spin amount Ss are specified. This is advantageous in simplifying the processing required for the above.

  In the present embodiment, the simulation of the movement trajectory of the golf ball 2 is performed in consideration of the backspin amount of the golf ball 2, so that the accuracy of the simulation of the movement trajectory is improved and the swing characteristics are provided accurately. This is advantageous.

  In the present embodiment, when simulating the movement trajectory of the golf ball 2, the ball initial speed and the vertical launch angle are determined using a fixed value that is determined in advance according to the attribute of the golfer as the vertical launch angle. There is no need to actually measure and it is advantageous in performing a simple simulation.

  In the present embodiment, the ball initial velocity and the vertical launch angle are measured at the time of hitting by the golfer, and the measured ball initial velocity and the vertical launch angle are used when simulating the movement trajectory of the golf ball 2. This is advantageous in improving the accuracy of the trajectory simulation and providing the swing characteristics accurately.

Moreover, according to the display chart of the swing of the golf club of this Embodiment, the following effects are show | played.
Since the display chart has a two-dimensional coordinate axis indicating the left and right approach angle θ and the hitting face angle φ, and an area indicating the ball muscle of the golf ball 2, the left and right approaching angle θ and the hitting face angle φ, The relationship with the area can be easily understood, that is, it is advantageous to easily understand the characteristics of the swing.

Particularly in the present embodiment, the plurality of areas include a slice area A1, a fade area A2, a straight area A3, a draw area A4, and a hook area A5. The relationship with the area can be more easily understood, that is, it is more advantageous to easily understand the characteristics of the swing.
Further, since it can be carried or stored as a medium, it is more advantageous in increasing the value of services provided to golfers.
In addition, by measuring the behavior of the golf club head 16 when the golfer actually swings and displaying the measurement points on the display chart, the characteristics of the swing can be easily understood based on the area where the measurement points are displayed. This is advantageous.
A display chart having a two-dimensional coordinate axis and an area may be prepared in advance, and the measurement points may be printed later by the printer 48.
This is advantageous in reducing the printing time.

In the present embodiment, the case where the area corresponding to the ball of the golf ball 2 is divided into five areas such as a slice area A1, a fade area A2, a straight area A3, a draw area A4, and a hook area A5 has been described. .
However, for example, if it should be classified as flying straight, turning right, or turning left, it may be divided into three areas such as slice area A1, straight area A3, and hook area A5. .
In addition, it is unlikely that it will fly straight in the first place, and if it should be classified as either turning right or turning left, it may be divided into two areas such as slice area A1 and hook area A5.
That is, each area can be appropriately set according to the concept of those skilled in the art.
The range of each area can also be set as appropriate according to the concept of those skilled in the art, for example, by increasing the tolerance of bending to increase the range of the straight area A3.

2 Golf ball 4 Golf club 10 Golf club selection device 16 Golf club head 1602 Face surface LA First boundary line LB Second boundary line L0 Reference line L1 First straight line L2 Second straight line θ Left and right approach angle θ
φ Face angle at impact φ
α Left and right launch angle α
ΔS Shift amount ΔS
A1 Slice area A2 Fade area A3 Straight area A4 Draw area A5 Hook area

Claims (10)

A golf club swing display method for displaying on a display device swing characteristics measured based on the behavior of a golf club head immediately before the golf club head of a golf club swung by a golfer hits a golf ball.
A reference line obtained by projecting a target line connecting the center of the golf ball and the target onto a plane parallel to a horizontal plane, and a tangent to the movement trajectory of the golf club head immediately before hitting the golf ball are projected onto the plane. The angle formed by the straight line is the left and right approach angle,
The positive and negative of the left and right approach angle is a positive angle on the opposite side of the golfer around the reference line, a negative angle on the golfer side,
The angle formed between the reference line and the second straight line projected on the plane from the normal line passing through the center point of the face surface of the golf club head immediately before hitting the golf ball is the face angle at the time of hitting,
The positive / negative of the face angle at the time of hitting is a positive angle on the opposite side of the golfer around the reference line, and a negative angle on the golfer side,
A left and right launch angle is defined as an angle formed by a line projected on the plane of the trajectory of the golf ball immediately after being hit by a golf club head of a golf club swung by the golfer and the reference line,
The positive and negative of the left and right launch angle is a positive angle on the opposite side of the golfer with the reference line as the center, and a negative angle on the golfer side,
The amount of spin around the vertical line passing through the center of the golf ball immediately after being hit and hit by the golf club head of the golf club swung by the golfer as the side spin amount,
The positive or negative side spin amount is positive in plan view clockwise and negative in counterclockwise direction.
An estimation step of estimating the left and right launch angles and the side spin amount from the measured values of the left and right approach angles and the hitting face angle;
From the reference line to the landing point by simulating the movement trajectory of the golf ball based on the estimated left and right launch angle and the amount of side spin, the initial ball velocity of the golf ball, and the vertical launch angle of the golf ball A simulation step for calculating a shift amount which is a distance of
By repeating the estimation step and the simulation step, data including the left and right approach angles, the hitting face angle and the shift amount is accumulated, and the X axis indicating the left and right approach angles based on the accumulated data And a Y-axis perpendicular to the X-axis and indicating the face angle at the time of hitting, on a two-dimensional coordinate with the intersection of the X-axis and Y-axis being the left and right approach angles and the zero-degree of the hitting face angle A classification map creating step for creating a classification map that defines a plurality of areas demarcated according to the tendency of the spherical muscles specified based on the left and right approach angles, the hitting face angle, and the shift amount;
A coordinate axis display step for displaying the two-dimensional coordinate axes on a display screen of the display device;
Various area display steps for displaying a plurality of areas on the display screen based on the classification map;
A measurement point display step for displaying, on the display screen, a coordinate point indicating the value of the left and right approach angle measured when the golfer hits a golf ball using a golf club and the value of the face angle at the time of hitting as a measurement point. Including
A method for displaying a swing of a golf club. The estimation step includes
The estimation step is created based on the measured values of the left and right approach angles, the striking face angle, and the left and right launch angles, and specifies the left and right launch angles from the left and right approach angles and the striking face angle. The side spin amount is specified from the regression equation of 1 and the measured values of the left and right approach angles, the striking face angle and the side spin amount, and from the left and right approach angles and the striking face angle. And using the second regression equation.
The golf club swing display method according to claim 1, wherein the golf club swing is displayed. The simulation of the movement trajectory of the golf ball by the simulation step is performed in consideration of the backspin amount of the golf ball.
The golf club swing display method according to claim 1, wherein the golf club swing is displayed. The simulation of the movement trajectory of the golf ball by the simulation step uses a fixed value that is predetermined according to the attribute of the golfer as the ball initial velocity and the vertical launch angle.
3. A golf club swing display method according to claim 1, wherein the golf club swing is displayed. A measurement step of measuring the initial velocity of the ball and the vertical launch angle at the time of hitting by the golfer;
In the simulation step, the measurement value measured in the measurement step is used as the initial ball speed and the vertical launch angle.
3. A golf club swing display method according to claim 1, wherein the golf club swing is displayed. Before the various area display steps are performed,
On the display screen,
A first boundary line formed of a straight line corresponding to zero in which the shift amount extends with a positive inclination across the X axis and the Y axis in the two-dimensional coordinate axis;
A second boundary line consisting of a straight line that intersects the first boundary line in the two-dimensional coordinate axis and extends at a positive inclination larger than the first boundary line, the side spin amount corresponding to zero;
The border line display step to display
The display of a plurality of areas divided according to the tendency of the ball muscles by the various area display steps,
Of the two areas sandwiched between the first boundary line and the second boundary line, an area located closer to the positive direction of the X axis and the Y axis is displayed as a draw area,
Of the two areas sandwiched between the first boundary line and the second boundary line, an area located closer to the negative direction of the X axis and the Y axis is displayed as a fade area,
An area located on the positive side of the Y axis from the draw area and the fade area is displayed as a slice area,
An area located on the negative side of the Y axis from the draw area and the fade area is displayed as a hook area,
It is performed by displaying the second boundary line as a straight area.
The golf club swing display method according to claim 1, wherein the golf club swing is displayed. In the various area display step, a portion corresponding to a predetermined shift amount or less among the draw area, the fade area, and the straight area is displayed as an area of a good bulb line.
The golf club swing display method according to claim 6. In the various area display step, a portion corresponding to a predetermined side spin amount or less among the draw area, the fade area, and the straight area is displayed as an area of a good bulb.
8. The method for displaying a swing of a golf club according to claim 6, wherein the swing is displayed. A golf club swing display chart displaying swing characteristics measured based on the behavior of the golf club head just before the golf club head of a golf club swinged by a golfer hits a golf ball,
A reference line obtained by projecting a target line connecting the center of the golf ball and the target onto a plane parallel to a horizontal plane, and a tangent to the movement trajectory of the golf club head immediately before hitting the golf ball are projected onto the plane. The angle formed by the straight line is the left and right approach angle,
The positive and negative of the left and right approach angle is a positive angle on the opposite side of the golfer around the reference line, a negative angle on the golfer side,
The angle formed between the reference line and the second straight line projected on the plane from the normal line passing through the center point of the face surface of the golf club head immediately before hitting the golf ball is the face angle at the time of hitting,
The positive / negative of the face angle at the time of hitting is a positive angle on the opposite side of the golfer around the reference line, and a negative angle on the golfer side,
An X-axis indicating the left-right approach angle and a Y-axis perpendicular to the X-axis and indicating the face angle at the time of hitting are provided, and the intersection of the X-axis and Y-axis is the zero of the left-right approach angle and the hitting face angle. Two-dimensional coordinates formed as degrees,
On the two-dimensional coordinates, and having a plurality of areas divided according to the tendency of the spherical muscle,
A first boundary line formed of a straight line corresponding to zero in which the shift amount extends with a positive inclination across the X axis and the Y axis in the two-dimensional coordinate axis;
A second boundary line formed of a straight line that intersects the first boundary line and extends at a positive inclination larger than the first boundary line on the two-dimensional coordinate axis and corresponding to a side spin amount of zero. And
A plurality of areas divided according to the tendency of the ball muscles,
Of the two areas sandwiched between the first boundary line and the second boundary line, a draw area displayed in an area located closer to the positive direction of the X axis and the Y axis;
Of the two areas sandwiched between the first boundary line and the second boundary line, a fade area displayed in an area located closer to the negative direction of the X axis and the Y axis,
A slice area displayed in an area located on the positive side of the Y axis from the draw area and the fade area;
A hook area displayed in an area located on the negative side of the Y-axis from the draw area and the fade area;
A straight area displayed on the second boundary line,
The display chart of the swing of the golf club of Claim 1 characterized by the above-mentioned. It further has a measurement point displayed in any of the plurality of areas,
The measurement point is a coordinate point indicating the value of the left and right approach angle measured when the golfer hits a golf ball using a golf club and the value of the face angle at the time of hitting,
The display chart of the swing of the golf club of Claim 9 characterized by the above-mentioned.

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