WO2014045854A1

WO2014045854A1 - Golf club and golf swing measurement system

Info

Publication number: WO2014045854A1
Application number: PCT/JP2013/073550
Authority: WO
Inventors: 伸幸能澤
Original assignee: 株式会社村田製作所
Priority date: 2012-09-19
Filing date: 2013-09-02
Publication date: 2014-03-27

Abstract

Provided are a golf club and a golf swing measurement system with which golf swings can be measured easily. This golf club is characterized in being provided with: a main golf club body equipped with a shaft (1), a head (2), and a grip (3); and a sheet-shaped displacement sensor (4) that is installed on the shaft (1) and is for detecting the magnitude of the displacement of the shaft (1).

Description

Golf club and golf swing measurement system

The present invention relates to a golf club provided with a sheet-like displacement sensor for detecting a displacement amount of a shaft. The present invention also relates to a golf swing measurement system provided with the golf club.

In order to achieve good results in golf competitions, it is important to acquire the ability to fly the ball far away and the ability to fly the ball in the desired direction. In order to fly the ball far away or in a desired direction, it is necessary to perform an exemplary correct golf swing.

Golf swing consists of take back, swing down, impact and follow.

A golf club or a measurement system for measuring such a golf swing is disclosed in Patent Document 1 (Japanese Patent Publication No. 2008-506421) and Patent Document 2 (Japanese Patent Laid-Open No. 2008-73210). Patent Document 1 discloses a golf club in which a gyro sensor and an acceleration sensor are provided in the head of the golf club. Patent Document 2 discloses a golf club in which a gyro sensor and an acceleration sensor are provided on both a head portion and a grip portion of the golf club, respectively. These golf clubs use a gyro sensor and an acceleration sensor to measure the trajectory of the head due to the golf swing or the trajectory of the golf club itself, and determine whether the golf swing is good or bad.

On the other hand, in recent years, the development of a sheet-like displacement sensor that detects the amount of bending of a measured object using a sheet-like member having piezoelectric characteristics has been progressing. For example, Patent Document 3 (Japanese Patent Application Laid-Open No. 2000-41960) describes a sensor that uses polyvinylidene fluoride to detect the movement of columnar protrusions that move up and down due to pulsation.

Special table 2008-506421 gazette JP 2008-73210 A JP 2000-41960 A

The golf clubs or golf swing measurement systems disclosed in Patent Document 1 and Patent Document 2 described above measure the trajectory of the head by the golf swing or the trajectory of the golf club itself, and determine whether the golf swing is good or bad. .

However, in the evaluation of a golf swing based on the trajectory of the head or the golf club itself, the timing and strength of the golfer (measured person) himself is an indirect measurement, and is not necessarily related to the movement of the golfer's body. It is not information that can be directly fed back. Usually, the track of the club and the head speed could be improved only by the trial and error of the golfer himself or the advice of an expert. Further, in order to perform a more accurate evaluation, it is necessary to determine the quality of the golf swing after analyzing the data of the locus of the head or the like using a complicated program.

Further, the golf clubs disclosed in Patent Document 1 and Patent Document 2 are golf clubs dedicated to golf swing measurement in which a gyro sensor or an acceleration sensor is embedded in a head portion or a grip portion, and are usually used by a measured person. The golf swing could not be measured by a golf club.

As a result of earnest research, the inventor of the present application does not measure the trajectory of the head or the like in order to judge the quality of the golf swing, but rather detects the displacement of the golf club shaft, such as bending or twisting. It has been found that the quality of a golf swing can be judged more directly and simply, and information that can be directly fed back to the movement of a golfer's body can be obtained.

A golf club according to the present invention includes a golf club body including a shaft, a head, and a grip, and a sheet-like displacement sensor that is attached to the shaft and detects a displacement amount of the shaft. To do.

The sheet-like displacement sensor may be at least one of a bending displacement sensor and a torsional displacement sensor, the bending displacement sensor may detect the amount of bending of the shaft, and the torsional displacement sensor may detect the amount of twisting of the shaft. .

The sheet-like displacement sensor may be detachably attached to the shaft with a double-sided adhesive tape or an adhesive tape covering the displacement sensor. In this case, it is possible to measure a golf swing by sticking a sheet-like displacement sensor to a golf club that is normally used by the player. In addition, golf club dealers prepare a plurality of types of golf clubs having different shaft lengths, thicknesses, head shapes, sizes, weights, and the like, and seat-type displacement sensors are provided on these golf clubs. By pasting them in order and measuring the golf swing with a plurality of types of golf clubs from different customers visiting the purchase of the golf club, it is possible to select and purchase the golf club that is most suitable for the customer.

Further, the apparatus further includes data transmitting means for transmitting data output from the sheet-like displacement sensor installed at any part of the golf club body or provided outside the golf club body. Also good. In this case, it is not necessary to connect the golf club and the data display means for displaying the detected data with a wire such as a cord, and the golf swing can be measured without being obstructed by the cord.

The golf swing measuring system of the present invention includes the above-described golf club, data receiving means for receiving data transmitted from the data transmitting means, and data display means for displaying data received by the data receiving means. It is characterized by that.

Since the golf club and the golf swing measurement system of the present invention have the above-described configuration, it is possible to easily measure a golf swing. In addition, the amount of bending and twisting directly detects how to apply force and how to use the wrist, so it can be easily fed back to operation. In addition, since the golf club of the present invention uses a sheet-like displacement sensor attached to the shaft, the displacement sensor does not interfere with the golf swing during the golf swing measurement.

1 is a plan view showing a golf club 100 according to an embodiment of the present invention. FIGS. 2A to 2C show the sheet-like displacement sensor 4 used in the golf club 100 shown in FIG. 1, where FIG. 2A is a plan view and FIG. 2B is a front view. FIG. 2C is a bottom view. It is explanatory drawing which shows the golf swing measurement system 200 concerning the embodiment of this invention provided with the golf club 100 shown in FIG. 4 is a graph showing the amount of bending and twisting of the shaft 1 during a golf swing measured by the golf swing measuring system 200 shown in FIG. 3 using the golf club 100 shown in FIG. 1.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

FIG. 1 shows a golf club 100 according to an embodiment of the present invention.

The golf club 100 includes a shaft 1. The shaft 1 has a rod shape, for example, carbon or metal.

A head 2 is provided at one end of the shaft 1. The head 2 has a desired shape, size, and weight, and is made of, for example, iron, wood, stainless steel, carbon fiber, titanium alloy, or the like.

A grip 3 is provided at the other end of the shaft 1. The grip 3 is made of rubber, for example, and covers the other end of the shaft 1.

A shaft-like displacement sensor 4 is attached to the shaft 1. More specifically, the displacement sensor 4 is attached to the side surface of the shaft 1 with a double-sided adhesive tape (not shown).

The displacement sensor 4 has both functions of a bending displacement sensor and a torsional displacement sensor.

Hereinafter, the details of the displacement sensor 4 will be described with reference to FIGS. 2 (A) to (C). 2A is a plan view of the displacement sensor 4, FIG. 2B is a front view, and FIG. 2C is a bottom view.

The displacement sensor 4 includes an elastic body 10, a first piezoelectric element 20, and a second piezoelectric element 30.

The elastic body 10 has a predetermined thickness, and has a rectangular shape having a long side and a short side, which is long in one direction and short in a direction perpendicular to this direction in plan view. The elastic body 10 is formed of a polymer having a relatively high strength such as polyethylene phthalate (PET) or acrylic resin (PMMA).

The first piezoelectric element 20 includes a piezoelectric sheet 21 having a rectangular shape similar to that of the elastic body 10. An electrode 22 is formed on the substantially entire surface of the first main surface of the piezoelectric sheet 21, and an electrode 23 is formed on the approximately entire surface of the second main surface. Furthermore, an external connection terminal 24A is connected to the electrode 22, and an external connection terminal 24B is connected to the electrode 23.

The second piezoelectric element 30 includes a piezoelectric sheet 31 having a rectangular shape similar to that of the elastic body 10. An electrode 32 is formed on the entire first surface of the piezoelectric sheet 31, and an electrode 33 is formed on the entire second surface of the second main surface. Furthermore, an external connection terminal 34 </ b> A is connected to the electrode 32, and an external connection terminal 34 </ b> B is connected to the electrode 33.

The

piezoelectric sheets

21 and 31 are made of L-type polylactic acid (hereinafter referred to as PLLA). PLLA used for the

piezoelectric sheets

21 and 31 is a chiral polymer, and the main chain has a helical structure. This PLLA sheet is uniaxially stretched and has piezoelectricity when the molecules are oriented.

In the present embodiment, the piezoelectric sheet 21 of the first piezoelectric element 20 is formed such that the uniaxial stretching direction (arrow 21X) and the longitudinal direction form 45 °. The piezoelectric sheet 31 of the second piezoelectric element 30 is formed so that the uniaxial stretching direction (arrow 31X) and the longitudinal direction are parallel (angle formed = 0 °). That is, in the first piezoelectric element 20 and the second piezoelectric element 30, the uniaxial stretching direction of the piezoelectric sheet 21 and the uniaxial stretching direction of the piezoelectric sheet 31 form 45 °, and the longitudinal direction of the piezoelectric sheet 31 is an elastic body. 10 is attached to the elastic body 10 so as to be parallel to the longitudinal direction.

In the present embodiment, the first piezoelectric element 20 of the displacement sensor 4 can detect bending displacement (flexure amount sensor), and the second piezoelectric element 30 can detect torsional displacement (torsion amount sensor). ). These bending displacements and torsional displacements can be detected independently and simultaneously.

Referring again to FIG. 1, the golf club 100 includes data transmission means 5 that is attached to the shaft 1 and transmits data output from the displacement sensor 4 to the outside. The data transmission means 5 includes a known data transmission circuit, an antenna, and the like. The data transmission means 5 is connected to the

external connection terminals

24A, 24B, 34A, 34B of the displacement sensor 4. Note that the data transmission means 5 may be attached to another part of the golf club 100 instead of being attached to the shaft 1 or attached to the clothes of the user of the golf club 100 as a separate body from the golf club 100. You may do it.

FIG. 3 shows a golf swing measurement system 200 according to the present embodiment.

The golf swing measurement system 200 includes the above-described golf club 100 according to the present embodiment, data receiving means 6 that receives data transmitted from the data transmitting means 5 of the golf club 100, and data received by the data receiving means 6. Is provided with data display means 7 for displaying.

The data receiving means 6 includes a known antenna, a data receiving circuit, and the like. For data transmission from the data transmission means 5 to the data reception means 6, known data transmission means such as a wireless LAN and Bluetooth (registered trademark) can be used.

The data display means 7 may be a known data display means such as a personal computer, a tablet computer, a smartphone, or the like. Existing software may be used as the software for display, or dedicated software may be newly created.

The golf club 100 and the golf swing measurement system 200 according to the embodiment of the present invention have been described above. However, the present invention is not limited to these embodiments, and various modifications can be made in accordance with the spirit of the invention.

For example, in the golf club 100, the displacement sensor 4 including the

piezoelectric sheets

21 and 31 made of PLLA was used, but the principle, material, structure, etc. of the displacement sensor are not limited to this, Other types can be used as long as they are sheet-like.

Also, the mounting position of the displacement sensor 4 on the shaft 1 is arbitrary, and is not limited to the position shown in FIG. Also, the number of displacement sensors 4 attached to the shaft 1 is arbitrary, and a plurality of displacement sensors 4 may be attached instead of attaching one as described above.

Experimental example

Using the golf club 100 and the golf swing measurement system 200 according to the above-described embodiment, the bending amount and the twisting amount of the shaft 1 of the golf club 100 during the golf swing of the measurement subject were measured.

Fig. 4 shows the measurement results. In FIG. 4, the X-axis shows the time from 1 × 10 msec to 180 × 10 msec required from the start to the end of the swing, and the Y-axis shows the amount of bending measured through the electromotive force due to the piezoelectric effect. dl / dt and twist amount dr / dt were shown. Here, dt is a minute time, dl is a bending change amount in the minute time dt, and dr is a twist change amount in the minute time dt.

From the bending amount, it is possible to directly grasp the bending state of the shaft 1 of the golf club 100 at the time of takeback, swinging down, impact, and follow-up. Further, the twist of the shaft can be understood from the twist amount, and the behavior of the club head in the twist direction can be read.

Such a golf swing measurement result is, for example, by comparing a golf swing measurement result of an exemplary measurement subject with a measurement result of the golf swing of the own person and repeating the swing to exemplify the state of the golf swing of the user. It can be used to improve the ability of the golf swing by a method such as making it close to the state of the golf swing of a typical person to be measured.

In general, in the measurement results shown in FIG. 4, the larger the area S formed by the deflection amount line and the Y-axis zero line when swinging down, the greater the swing energy and the greater the ball flight distance. It is thought to grow. Also, if the impact is made within the time t _{1 when the} amount of deflection after the end of swinging is negative, the energy obtained by the repulsion of the shaft can be sufficiently transmitted to the ball, and the flying distance of the ball can be reduced. It is thought to grow.

Also, the measurement result of the golf swing can be used to select and purchase the most suitable golf club by measuring the golf swing with a plurality of types of golf clubs at a golf club store.

In addition, the amount of flexure and the amount of torsion are the direct measurements of how a golfer applies force to the golf club (arm swing and body rotation) and wrist turn, so feed back the measurement results. This makes it possible for golfers themselves to improve their swings intuitively and specifically.

1: Shaft 2: Head 3: Grip 4: Displacement sensor 5: Data transmission means 6: Data reception means 7: Data display means 100: Golf club 200: Golf swing measurement system

Claims

A golf club body having a shaft, a head, and a grip;
A golf club comprising: a sheet-like displacement sensor attached to the shaft for detecting a displacement amount of the shaft.
The sheet-like displacement sensor is at least one of a bending displacement sensor and a torsional displacement sensor, the bending displacement sensor detects the amount of bending of the shaft, and the torsional displacement sensor detects the amount of twisting of the shaft. The golf club according to claim 1, wherein:
The sheet-like displacement sensor is detachably attached to the shaft by a double-sided adhesive tape or an adhesive tape-like material covering the displacement sensor. Golf club.
The apparatus further comprises data transmitting means for transmitting data output from the sheet-like displacement sensor installed at any part of the golf club body or provided outside the golf club body. The golf club according to any one of claims 1 to 3, wherein:
5. A golf club according to claim 4, comprising: data receiving means for receiving data transmitted from said data transmitting means; and data display means for displaying data received by said data receiving means. A golf swing measurement system.