JP4201672B2 - Golf swing classification method and golf swing classification device - Google Patents

Description

The present invention relates to a golf swing classification apparatus implementing golf swing classification method, and the method of classifying a golf swing that golfer performed by gripping a golf club.

Many golfers find and purchase golf clubs suitable for themselves among the many golf clubs on the market in order to accurately and stably fly the golf ball and to increase the flight distance. try to. For example, whether or not it is easy to actually hit a golf ball by trial hitting and the degree of flight distance of the hit golf ball are used as judgment materials for purchase. However, it is often very difficult for a golfer to determine whether or not it is easy to hit a golf ball.
On the other hand, golf manufacturers classify golfers into several types and provide golf clubs suitable for each type.

  For example, the present applicant recommends golfers to purchase a golf club suitable for this head speed by measuring the head speed of the golf club head when the golf club is held and a golf swing is performed. In this method, by classifying golfers according to the difference in head speed, it is possible to provide a golf club that is appropriate to some extent for golfers.

In recent years, however, the requirements of golfers when selecting a golf club have become finer. In addition, due to the increase in the size and length of the golf club head, there is a case where it is not always possible to provide a golf club that is optimal for a golfer's golf swing using only the head speed of the golf club head. It was.
In addition, today, it is strongly desired to provide an optimum golf club based not only on the difference in the head speed of the golf club head but also on the difference in the golf swing itself.

Therefore, the present invention relates to a golf swing by a golfer in order to solve the above-described problems of the prior art. It is an object of the present invention to provide a golf swing classification method for classifying and a golf swing classification device for implementing the method.

  In order to achieve the above object, the present invention relates to a method for classifying golf swings performed by a golfer by grasping a golf club, and the position of the grip portion of the golf club in the golf swing and the golf club corresponding to this position A golf ball during a golf swing follow-through in a measuring step for measuring the orientation of the shaft, and a projection plane representing the position of the grip portion and the orientation of the golf club shaft when viewed from the front or upper front of the golfer. The position of the grip portion when the club shaft faces the horizontal direction with respect to the ground is determined, and a straight line parallel to the horizontal direction passing through this position is used as a reference line, and immediately before the follow-through, the golf club shaft is aligned with the horizontal direction. The distance from the reference line of the position of the grip portion when facing in the orthogonal direction A calculation step of leaving, to provide a golf swing classification method characterized in that it comprises a classification step of classifying the golf swing, the using the distance.

Here, the measuring step simultaneously measures the head speed of the golf club head,
Preferably, the classifying step classifies the golf swing using the head speed and the distance.

  The present invention also relates to a golf swing classification device for classifying golf swings performed by a golfer by holding a golf club, the position of the grip portion of the golf club in the golf swing and the orientation of the golf club shaft corresponding to this position A golf club shaft at the time of follow-through of a golf swing in a measuring plane for measuring the position of the grip portion when viewed from the front or upper front of the golfer and the orientation of the golf club shaft at this position. Finding the position of the grip part when facing the horizontal direction with respect to the ground, using a straight line passing through this position parallel to the horizontal direction as a reference line, and immediately before the follow-through, the golf club shaft in a direction perpendicular to the horizontal direction Calculate the distance from the reference line of the position of the grip when facing And calculation means, to provide a golf swing classifier, characterized in that it comprises an evaluation means for evaluating and classifying the golf swing, the using the distance.

  According to the present invention, as will be described later, the IF length is calculated and used to classify the golf swing. Therefore, in addition to the difference in the head speed of the golf club head, the difference in the golf swing itself is clarified. The golf swing of the golfer can be classified.

Hereinafter, golf swing classification method of the present invention, and with the golf swing classification device will be described in detail based on preferred embodiments shown in the accompanying drawings.

The golf swing classifying apparatus of the present invention that implements the golf swing classifying method of the present invention will be described in detail below based on preferred embodiments shown in the accompanying drawings.
FIG. 1 shows a schematic configuration of an apparatus when a golf swing of a golfer G is classified using a golf swing classification apparatus 10.

The golf swing classification device 10 includes a measuring device 12 that measures the position of the grip portion 20 of the golf club 18 during the golf swing and the orientation of the golf club shaft 19 of the golf club corresponding to this position (the orientation of the grip portion 20). Have.
The measuring device 12 includes a transmitter 12a that forms a magnetic field having a known distribution of strength and direction within a moving range of the grip portion 20 during golf swing performed by gripping the grip portion 20 of the golf club 18, and the grip portion 20. And a receiver (magnetic sensor) 12b that outputs a signal including information on a three-dimensional position with respect to a reference position and Euler angle by sensing a magnetic field, and 3 of the grip part 20 based on this signal. A controller 12c that generates time-series data of dimension positions (x _m , y _m , z _m ) and time-series data of Euler angles (θ _y , θ _p , θ _r ) of the grip part;

  That is, as shown in FIG. 1, the measuring device 12 generates three types of predetermined magnetic fields one after another from a transmitter 12a arranged and fixed behind a golfer who performs golf swinging, and is fixed to a grip unit 20 that moves and rotates. The receiver 12b senses magnetism corresponding to the positions and orientations in the three types of magnetic fields created by the transmitter 12a and outputs a total of nine output voltages, and data processing is performed in the controller 12c from this output voltage. This is a device that can obtain data of the three-dimensional position and orientation (Euler angle) of the receiver 12b.

Such a measuring device 12 will be described. As shown in FIG. 2, a transmitter 12a that forms a predetermined magnetic field, a receiver 12b that generates an output voltage in three axial directions according to the strength and direction of the magnetic field, And a controller 12c.
The controller 12c generates a drive signal that sequentially generates predetermined three types of magnetic fields in the transmitter 12a, detects a signal output from the receiver 12b, performs data processing from the detected signal, performs a predetermined position, For example, the position of the transmitter 12a is set as a reference position, and three-dimensional position coordinates (x _m , y _m , z _m ) with reference to three axes X, Y, Z orthogonal to each other and a predetermined reference direction, for example, X, Y , Calculating the time series data of the attitude angle representing the orientation of the receiver 12b with respect to the Z coordinate axis direction, that is, the yaw angle, the pitch angle, and the roll angle (hereinafter referred to as Euler angles (θ _y , θ _p , θ _r )) Output.

As shown in FIG. 2, the transmitter 12a and the receiver 12b are configured by three coils wound in a loop shape in three axial directions orthogonal to each other, and the transmitter 12a is fixedly disposed behind the golfer who performs golf swing. The receiver 12b is fixed to the end of the grip portion 20 of the golf club 18.
The controller 12c controls a drive circuit 12d that generates a drive signal that sequentially generates three types of magnetic fields, a detection circuit 12e that detects a signal output from the receiver 12b, and the drive circuit 12d and the detection circuit 12e. The control unit 12f obtains the three-dimensional position and Euler angle of the receiver 12b from the signal sent from the detection circuit 12e. The transmitter 12a is connected to the drive circuit 12d, and the receiver 12b is connected to the detection circuit 12e.

The measuring device 12 is configured as described above. The time-series data of the three-dimensional position coordinates (x _m , y _m , z _m ) with respect to the reference position of the receiver 12b fixed to the grip portion 20 and the Euler angles (θ _y , θ _p , θ _r ) with respect to the reference direction are as follows: It is obtained as follows.
As shown in FIG. 2, the drive circuit 12d outputs the same signal whose frequency and phase are always constant according to the command signal of the control unit 12f, and outputs three loop coils wound in the three axis directions of the transmitter 12a. Energize sequentially. Each loop-like coil generates a different magnetic field each time it is excited, and based on this magnetic field, three loop-like coils wound around the three axes of the receiver 12b generate independent voltages. Since this voltage is three independent voltages generated in the three loop coils of the receiver 12b in accordance with the three magnetic fields excited by the three loop coils of the transmitter 12a, a total of nine (3 × 3) voltage is obtained.

On the other hand, since the transmitter 12a for forming the magnetic field is fixedly installed at a predetermined position, the distribution regarding the strength and direction of the generated magnetic field is known with respect to the reference position and the reference direction where the transmitter 12a is installed. Therefore, by using nine voltages generated by the formed magnetic field, the three-dimensional position coordinates (x _m , y _m , z _m ) of the receiver 12b with respect to the reference position and the Euler angles (θ _y , θ with respect to the reference direction) are used. Six unknowns of _p , θ _r ) can be obtained.
The control unit 12f of the controller 12c uses the nine voltages sent from the detection circuit 12e to three-dimensional position coordinates (x _m , y _m , z _m ) and Euler angles (θ _y , θ _p , θ _r ). The data is calculated and obtained.
The three-dimensional position coordinates (x _m , y _m , z _m ) and the Euler angles (θ _y , θ _p , θ _r ) obtained by the three-dimensional position measuring device 12 are supplied to a computer 14 that is a data processing unit. .

In the present embodiment, as shown in FIG. 2, the receiver 12b has a coil wound in a loop shape in three axial directions orthogonal to each other. The end portion of the grip portion 20 of the golf club 18 is determined with the direction of the receiver 12b so as to match the axial direction of the golf club shaft 19 and further match one of the remaining two axial directions to the striking direction of the golf club. Fixed to.
An example of such a measuring device 12 is 3SPACE FASTRAK (manufactured by Polhemus).

Here, the three-dimensional position coordinates _{(x m, y m, z} m) , as shown in FIG. 3 (a), of the grip portion 20, the distance _x m from the reference position in the XYZ coordinate system, _{y m} and z _m . On the other hand, as shown in FIGS. 3B to 3D, Euler angles (θ _y , θ _p , θ _r ) indicate how each coordinate axis of the xyz coordinate system in the receiver 12b is relative to the XYZ coordinate system. It is a rotation angle that defines whether or not it is rotating. That is, the Euler angles (θ _y , θ _p , θ _r ) are rotationally converted with the X, Y, and Z axes first rotating about the Z axis and the X axis as the X ′ axis (FIG. 3 ( b)), rotation conversion performed around the Y ′ axis generated by this rotation (see FIG. 3C), and rotation conversion performed around the X ″ axis generated by this rotation (FIG. 3). (See (d)), the yaw angle θ _y and the pitch angle θ _p that are the rotation angles of the rotation conversion defined so as to coincide with the x-axis, y-axis, and z-axis of the receiver 12 fixed to the grip portion 20. And the roll angle θ _r .

  Further, the golf swing classification device 10 is provided with sensors 13a and 13b that output detection signals for detecting the passage of the golf club head along the swing path of the golf club head, thereby forming the head speed measuring sensor 13. Detection signals from the sensors 13a and 13b are sent to the computer 14 and used to calculate the head speed of the golf club head.

  As shown in FIG. 4, the computer 14 includes a position / orientation calculation unit 14a, a distance calculation unit 14b, and an evaluation unit 14c. These parts exhibit their functions by executing a program. In addition, it may be configured by a dedicated circuit instead of the computer 14.

The position / orientation calculation unit 14a calculates the three-dimensional position of the grip unit 20 from the supplied three-dimensional position coordinates (x _m , y _m , z _m ) and time series data of Euler angles (θ _y , θ _p , θ _r ). This is a part obtained by calculating time-series data about the position and the direction of the grip portion 20 in the three-dimensional direction in the XYZ coordinate system. For example, three-dimensional position coordinates (x _m , y _m , z _m ), azimuth and elevation angles in the XYZ coordinate system, and time series data of rotation around the axis of the golf club shaft 19 are obtained. The time-series data of the three-dimensional position of the grip unit 20 and the direction of the grip unit 20 in the three-dimensional direction in the XYZ coordinate system is stored in a memory or a recording medium (not shown) of the computer 14.
Further, the calculated time-series data of the three-dimensional position of the grip portion 20 and the direction in the three-dimensional direction is the track of the grip portion 20 viewed from the set predetermined direction, for example, golf viewed from the front facing the golfer G. It is converted into the data of the track of the grip part 20 during the swing and supplied to the monitor 16.

  The distance calculation unit 14b is a projection that represents the position of the grip unit 20 and the orientation of the golf club shaft 19 when viewed from the front of the golfer G performing golf swing (when viewed from the right side of the drawing in FIG. 1). In the plane, a straight line parallel to the horizontal direction passing through the position of the grip portion 20 when the golf club shaft is oriented in the horizontal direction with respect to the ground during the follow-through of the golf swing is used as a reference line, and the golf club shaft 19 is immediately before the follow-through. This is a part for calculating the distance from the reference line to this measurement position (hereinafter referred to as IF length), where the position of the grip portion 20 when facing in the direction orthogonal to the horizontal direction is the measurement position. The calculated IF length is supplied to the evaluation unit 14c.

In FIGS. 5A and 5B, a projection surface representing the behavior of the grip portion 20 of the golf swing performed by two golfers with different golf swings when viewed from the front of the golfer is displayed on the monitor 16. It is an example.
In this projection plane, the behavior of the grip part 20 from the state of the top T in the golf swing when viewed from the front of the golfer to the down swing D, the impact I, and the follow through F is expressed using line segments. Yes. The direction of the line segment indicates the direction of the golf club shaft 19 (the direction of the grip portion 20).
Here, the reference line is a straight line L. On the other hand, the IF length is the position of the grip portion 20 in the vicinity of the impact I region when the direction of the golf club shaft is orthogonal to the straight line L (the direction of the golf club shaft 19 is downward in the drawing). Is a distance from the straight line L of the position P.
The IF length obtained in this manner varies depending on the golf swing of the golfer. As shown in FIG. 5A, there is a golf swing having an IF length of 20 to 30 cm, as shown in FIG. 5B. Some golf swings have an IF length of 5 cm or less.
In the present invention, golf swings are classified using the difference in IF length.

The evaluation unit 14c calculates the head speed using the detection signal supplied from the head speed measurement sensor 13, and uses the head speed and the I-F length supplied from the distance calculation unit 14b as follows. In this way, the golf swing is classified by type.
Here, as shown in FIG. 7, the evaluation unit 14c has a type α (IF length: 0 cm or more and 10 cm or less), a type β (IF length: longer than 10 cm and 20 cm or less) and a type. Classification is made into γ (IF length: longer than 20 cm), and combined with the classification according to the head speed that has been conventionally performed, classification of type I to type V is performed. In the example shown in FIG. 7, the golf club head has a mass of 190 g, the length of the golf club shaft is 45 inches, and the I-F length is added to the length of the golf club shaft. Rotating radius when drawing a circle and calculating the centrifugal force acting on the golf club head using this rotating radius and the measured head speed, rounding the calculation result to an integer value, This integer value is used for classification into types I to V.
As described above, the present invention is characterized by classifying golf swings using the IF length, more precisely, using the IF length and the head speed.

In general, the flight distance of a golf ball is roughly determined by the head speed of the golf club head when the golf ball is hit with the golf club head. This flight distance is determined by the face surface of the golf club head when impacting the golf ball. It changes slightly depending on the angle. As is well known, the position of the center of gravity of the golf club head H is offset to the rear of the face surface with respect to the golf club shaft 19, so that the golf club head has increased centrifugal force from downswing to impact as shown in FIG. A bending moment that tends to move in the front direction of the face surface is generated by the force F, and as a result, the golf club shaft 19 is bent. Due to this bending deformation, the loft angle of the face surface of the golf club head changes, and the trajectory and flight distance of the flying golf ball change. That is, it can be said that the flying distance and the trajectory of the golf ball change due to the centrifugal force applied to the golf club head H when impacting the golf ball.
Therefore, as described above, when the IF length that varies depending on the golf swing is measured, the centrifugal force F applied to the golf club head is roughly determined using the IF length and the head speed of the golf club head H. The golf swing can be classified by the centrifugal force F.

The evaluation unit 14c calculates the centrifugal force applied to the golf club head during golf swing, supplies type I to type V classification results based on the head speed and IF length to the monitor 16, and displays the results on the monitor 16. Let Thus, the golfer can know his golf swing type from the classification result displayed on the monitor 16.
On the other hand, a golf club in which the hardness of the golf club shaft, the kick point, the mass of the golf club head, etc. are adjusted so as to be optimal for classification of golf swing type I to type V, etc. is provided and attached to the golf club Information indicating that the golf swing has been adjusted is written on a sticker or tag attached.
A golfer who knows the type of golf swing from the classification result displayed on the monitor 16 selects a golf club by referring to the display information described on the tag and the sticker while using his golf swing type as a guide. be able to.

In this embodiment, as shown in FIG. 7, using the IF length and the head speed of the golf club head, the head speed is classified into five categories and the IF length is classified into three categories, and the centrifugal force is divided. There are five types of types I to V, but the number of head speeds and I-F lengths is not limited to this, and can be set freely.
In FIG. 7, the golf club head has a mass of 190 g and the golf club shaft has a length of 45 inches. However, the present invention is not limited to such values. The computer 14 inputs and sets the mass of the golf club head and the length of the golf club shaft using an input operation device such as a keyboard or a mouse (not shown), calculates the centrifugal force using the set values, and the calculation result You may classify by.
In the above embodiment, the golf swing is classified by obtaining the centrifugal force applied to the golf club head. However, in the present invention, the classification of the head speed and the IF length of the golf club head is obtained without obtaining the centrifugal force. And the golf swing may be classified according to these two classifications.
The golf swing classification device 10 is configured as described above.

FIG. 8 is a flowchart showing a golf swing classification method performed by the golf swing classification device 10.
In the golf swing classification device 10, first, the golf swing by the golf club 18 is made by the golfer G.
A receiver 12b is fixedly provided at the end of the grip portion 20 of the golf club 18, and the behavior of the three-dimensional position of the grip portion 20 and the orientation of the golf club shaft 19 of the golf club 18 corresponding to this position (grip The behavior of the part 20 is measured (step 100).
At that time, a detection signal when the golf club head passes the sensors 13a and 13b is supplied to the computer 14, and the head speed of the golf club head is measured (step 102).

Further, the computer 14 displays on the monitor 16 the behavior of the grip portion 20 on the projection plane representing the position of the grip portion 20 and the orientation of the golf club shaft 19 when viewed from the front of the golfer (step 104).
Next, the distance from the reference line L to the position P on this projection plane is calculated as the IF length (step 106).
Thereafter, the golf swing is classified by roughly calculating the centrifugal force applied to the golf club head using the calculated IF length and the head speed value measured in step 102 (step 108). .

The table below mass 190 g, of the golf club shaft when performing a golf swing by gripping the golf club of 45 inches long, the head speed and I-F length golfer G _A ~G _U of 21 people It is the result of calculating and classifying the golf swing. The classification based on the head speed is conventionally performed, and is classified into type M37, type M40, type M43, type M46, and type M49. The classification based on the IF length is obtained by the golf swing classification device 10 and is classified into the types α, β, and γ shown in FIG. Further, the classification by centrifugal force is classified into types I to V shown in FIG. Further, in FIG. 7 shows information about results of the classification of the golf swing the golfer G _A ~G _U.

According to the above table, even if the conventional head speed classification is golfers G _{I to} G _N of type M43, the IF length is different from types α, β and γ, and the classification by centrifugal force is type III, Divided with IV. As described above, even if the conventional head speed classifications belong to the same classification, since the IF lengths are different, the centrifugal force applied to the golf club head is different, and the bending deformation received by the golf club shaft is also different. For this reason, the golf club optimized by the golfers G _{J to} G _N (type III) is not optimal for the golfer G _I (type IV).
As described above, according to the present invention, in addition to the head speed, the IF length is obtained from the behavior of the grip portion in the golf swing, and the golf swing is classified using the IF length. Can be done high.

In this embodiment, the IF length is obtained on the projection plane when the behavior of the grip portion is viewed from the front of the golfer. However, the IF length is obtained on the projection plane when the behavior of the grip portion is viewed from the upper front of the golfer. May be. For example, since the locus of the grip portion from the downswing to the follow-through during golf swing is located on a substantially plane, this plane may be the projection plane.
In this embodiment, the behavior of the grip portion is measured by measuring the position of the grip portion and the orientation of the grip portion (direction of the golf club shaft) using a magnetic sensor. In the present invention, the position of the grip portion is measured. The method for measuring the orientation of the grip portion is not limited. For example, the position of the grip portion and the orientation of the grip portion may be measured by image processing from an image taken using a video camera or the like.

  Thus, golfers who know their golf swing type, etc., categorize golf clubs classified by golf swing type using IF length and head speed as classification parameters, using the classified golf swing type as a guideline. Selection can be easily made based on display information such as a tag or a seal of a golf club. In such a golf club, the hardness of the golf club shaft and the kick point of the golf club shaft such as the first tone and the original tone are adjusted for each type of golf swing. That is, the golf club shaft, the golf club head, and the like are adjusted so as to be suitable for each type of golf swing.

The golf club swing classification method and golf swing classification apparatus of the present invention are not limited to the above-described embodiments, and various improvements and modifications may be made without departing from the scope of the present invention. Of course.

It is a schematic block diagram of an apparatus at the time of classifying a golf swing of a golfer using a golf swing classification apparatus of the present invention. It is a schematic block diagram of the measuring apparatus in the golf swing classification | category apparatus shown in FIG. (A)-(d) is a figure explaining the measurement data at the time of measuring using the measuring apparatus shown in FIG. FIG. 2 is a block diagram functionally illustrating a schematic configuration of the computer illustrated in FIG. 1. (A) And (b) is a figure which shows the example of the measurement result obtained with the golf swing classification | category apparatus of this invention. It is a figure explaining the deformation | transformation of the golf club shaft during a golf swing. It is a figure explaining the classification | category in the golf club swing of this invention. It is a flowchart which shows an example of the golf swing classification | category method of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Golf swing classification | category device 12 Measuring apparatus 12a Transmitter 12b Emitter 12c Controller 13 Head speed measurement sensor 14 Computer 14a Position direction calculating part 14b Distance calculation part 14c Evaluation part 16 Monitor 18 Golf club 19 Golf club shaft 20 Grip part

Claims (3)

A method of classifying golf swings performed by a golfer holding a golf club,
A measuring step for measuring the position of the grip portion of the golf club during the golf swing and the orientation of the golf club shaft corresponding to the position;
In the projection plane showing the position of the grip portion when viewed from the front or upper front of the golfer and the orientation of the golf club shaft at this position, the golf club shaft is in a horizontal direction with respect to the ground during follow-through of the golf swing. The grip portion when the golf club shaft faces in a direction orthogonal to the horizontal direction immediately before the follow-through is obtained with a straight line parallel to the horizontal direction passing through this position as a reference line. A calculation step of calculating a distance from the reference line of the position of
A golf swing classification method comprising: classifying a golf swing using the distance. The measuring step simultaneously measures the head speed of the golf club head,
The golf swing classification method according to claim 1, wherein the classification step classifies a golf swing using the head speed and the distance. A golf swing classifying device for classifying a golf swing performed by a golfer holding a golf club,
Measuring means for measuring the position of the grip portion of the golf club during the golf swing and the orientation of the golf club shaft corresponding to this position;
In the projection plane showing the position of the grip portion when viewed from the front or upper front of the golfer and the orientation of the golf club shaft at this position, the golf club shaft is in a horizontal direction with respect to the ground during follow-through of the golf swing. Finding the position of the grip part when facing, using the straight line parallel to the horizontal direction passing through this position as a reference line, and immediately before the follow-through, the golf club shaft when facing the direction perpendicular to the horizontal direction Calculating means for calculating the distance of the position from the reference line;
And an evaluation means for classifying and evaluating the golf swing using the distance.

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