KR20100026389A - Training device for short game of golf - Google Patents

Abstract

PURPOSE: A golf short game exercise device is provided, which provides information including the translation distance of a golf ball and accuracy of the swing operation. CONSTITUTION: A golf short game exercise device comprises a club sensor, a golf ball sensor, a microprocessor, and a display unit(50). The club sensor is formed in the front and rear of the central part(A). The golf ball sensor is formed in the front both ends of the mat part(10). The microprocessor produces the short game analyzed result from the club sensor and the information sensed from the golf ball sensor. The display unit indicates the short game analyzed result calculated from the microprocessor.

Description

Training Device For Short Game Of Golf

The present invention relates to a golf short game practice apparatus, and more specifically, the approach distance and direction of the golf ball, the swing rhythm of the club, the impact state, the heating point of the club at impact when the approach shot or putting to approach the hole The present invention relates to a golf short game practice apparatus that enables a user to directly identify and correct problems in the short game by providing analysis information.

As golf becomes popular, golf-related industries such as screen golf courses, indoor golf course projects, putting and swiveling correction devices, etc., are being activated in the city center.

However, the conventional putting device is a fragmentary device that can simply put a golf ball into the hole cup of a fixed distance, it is impossible to accurately measure the swing or putting distance of the user, so that their putting ability or problems cannot be grasped. In addition, the minimum space of several meters is necessary, which is not only limited to the practice space but also has a problem that cannot be carried.

In addition, although not only the putting but also the approach for maximally attaching to the hole cup, there is no device that can provide analysis information about the distance and direction for the approach shot.

As an object of the present invention is to solve the problems described above, the objective of the present invention by providing information on the accuracy of the user's own swing movement and the golf ball when putting or approaching to check and correct their own skills and problems It is to provide a putting and approach analysis device that can be.

In order to achieve the above object, the golf short game practice apparatus according to the present invention is a short game practice apparatus that can play a short game by setting a golf ball in the center portion (A) of the mat, and before and after the center portion (A). A microprocessor and a microprocessor configured to calculate a short game analysis result from a club detector formed to detect a club and a golf ball detector formed at both ends of the front end of the mat and information sensed by the club detector and the golf ball detector; It characterized in that it comprises a display unit for displaying the result analysis of the short game calculated from.

Here, the club detecting unit is formed on the first horizontal axis (Y1) adjacent to the front of the reference horizontal axis (Y) passing through the center symmetrically around the center portion to detect both ends of the club head at the moment of impact and the central portion A second club sensing sensor and the center portion are formed symmetrically about the center portion on a second horizontal axis Y2 adjacent to the reference horizontal axis Y passing through the center to detect both ends of the club head at the start of the backswing and immediately before the impact. It is formed in the rear spaced apart from the back swing characterized in that it comprises a third club sensor for detecting the club.

The second club detection sensor may further include at least one detection sensor adjacent to both sides of the second club detection sensor, in order to measure the degree of separation of the club from the center part upon impact.

In addition, the golf ball detection unit includes a light receiving unit mounting portion and a plurality of light emitting portion mounted on the other side and the light receiving portion mounting portion formed to be inclined to have a predetermined inclination is mounted on one side of the front end of the mat portion; The plurality of light receiving parts may be formed on the outer surface of the light receiving part mounting part at predetermined height intervals, and the plurality of light emitting parts may be formed at the same height so as to correspond to each of the light receiving parts in parallel on a plane.

In addition, the microprocessor is a distance (D ₁ ) between the golf ball and the golf ball sensor and the detection time difference between the golf ball sensor and the average detection time difference between the first club sensor and the second club sensor (Δt) when putting Calculate the speed (V) of the golf ball by using, and the expected moving distance (S) of the golf ball when putting the golf ball (V) in consideration of the average friction constant (μ) input according to the turf conditions ) Is calculated.

In addition, the microprocessor uses the average sensing time (Δt) of the first club sensor and the second club sensor and the sensing information of the golf ball sensor to approach the tilt angle (θ) and the starting speed ( V ₀ ) is calculated and a horizontal reach distance S ₁ from the inclination angle θ and the starting speed V ₀ to the falling point of the golf ball by parabolic motion is calculated.

The microprocessor divides the height H from the ground and the inclination angle θ from the center for each of the plurality of golf ball detection sensors into areas L, C, and R, and stores them in advance. And determining the area (L, C, R) according to whether the face of the club is open, closed or square from the difference in the detection time between the first and second club detection sensors immediately before or after the impact. If there is only one ball sensor, the horizontal distance (S ₁ ) from the pre-stored height (H) and the inclination angle (θ) of the corresponding sensor to the falling point of the golf ball is calculated. It is characterized by calculating the horizontal reaching distance S ₁ from one height H and the inclination angle θ to the falling point of the golf ball.

In addition, the microprocessor calculates the speed (V ₁ ) at the falling point of the golf ball from the inclination angle (θ) and the starting speed (V ₀ ) and the average according to the speed (V ₁ ) of the falling point and turf conditions The distance (S ₂ ) at which the golf ball rolls from the falling point is calculated using a friction constant (μ), and the horizontal moving distance (S ₁ ) to the falling point of the golf ball is added to the total moving distance (S) of the golf ball. ) Is calculated.

In addition, the microprocessor is the difference between the average detection time of the second club detection sensor and the detection time of the third club detection sensor (Δt ₁ ) and the distance from the golf ball to the third club detection sensor (D ₂ ) at the start of the backswing. by using by using the back swing speed (V _B) and the downswing, the mean detection time difference (△ t ₂₎ of the third club detecting sensor of the detection time and the second club sensor calculates a down swing speed (V _D) And calculating a backswing size S _B from the backswing and downswing speeds V _B and V _D and the average detection time difference Δt ₁ and Δt ₂ .

In addition, the microprocessor determines whether the face state of the club head is open, closed or square from the difference in the sensing time between the second club detecting sensor immediately before the impact and the difference in the sensing time between the first club detecting sensor immediately after the impact. And determining whether the face state of the club head is open, closed or square.

As described above, the golf short game practice apparatus according to the present invention is portable and can practice the short game without any restrictions if a minimum space is secured, and provides all analysis information related to putting and approach shots. Since it is possible to check and correct the results and problems of his own shots, there is an excellent effect to improve the ability to adapt the short game.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 1a is a schematic diagram showing a golf short game practice apparatus according to a preferred embodiment of the present invention, Figure 1b is a block diagram of Figure 1a.

Referring to Figures 1a and 1b, the golf short game practice apparatus according to the present invention is a golf ball is set in the center portion (A) to provide a space for playing a short game and the mat portion 10 is formed in front of the back of the center portion backswing And a plurality of club detectors 20 for detecting golf clubs before and after impact, golf ball detectors 30 formed on both sides of the front end of the mat, and information sensed by the plurality of club detectors and golf ball detectors. And a microprocessor 40 for calculating a short game analysis result such as a moving distance of a ball, a swing trajectory, an impact state, and a heating point at impact, and a display unit 50 for displaying information calculated from the microprocessor. Can be.

Here, the golf short game is defined as a term including an approach shot and a putting shot on an on-green which can be reached without a full shot of a club (pitching wedge, approach wedge or sand wedge) that makes the shortest distance.

The microprocessor 40 may be mounted inside a panel constituting the display unit 50, and the panel may further include a key input unit for inputting keys for various functions in addition to the display unit 50. .

The club detection unit 20 may be composed of a plurality of club detection sensors, and formed to correspond to both ends of the club on the first horizontal axis (Y1) adjacent to the front of the reference horizontal axis (Y) passing through the central portion (A). And the first club detection sensor 21 for detecting both ends of the club at the moment of impact and the rear end of the second horizontal axis Y2 adjacent to the rear of the central horizontal axis Y so as to correspond to both ends of the club. And a second club detection sensor 22 for detecting both ends of the club immediately before the impact, and a third club detection sensor 23 formed at a rear end spaced apart from the center to detect the club at the time of backswing.

Here, two or more sensors may be formed adjacent to each other on the first horizontal axis Y1 in order to measure the degree of separation of the club from the center when impacting each of the second club sensor 22.

2 is a cross-sectional view of the club detector A-A 'of FIG. 1A.

Club detection unit is composed of a plurality of sensors and when the club swings the club often touches the mat part, in this case there is a risk that the sensor installed in the mat part needs to cushion the impact of the club.

Therefore, as shown in FIG. 2, the club sensing unit 20 may be separated from the mat unit 10, and the elastic member 240 may be formed under the club sensing unit 20.

Through this, even if the club detecting unit 20 is impacted by the club, it is possible to prevent the damage of the sensor mounted on the PCB by reducing the impact by the elastic force by the elastic member 240.

In addition, the golf ball detection unit 30 in this embodiment is for nine golf ball detection unit (first sensor to the ninth sensor) is formed, but the number of sensors can be added or subtracted as needed.

In addition, the golf ball detector 30 has a plurality of light receiving parts mounted on one side of the front end of the mat part and is inclined to have a predetermined inclination, and a light emitting part mounting part having a plurality of light emitting parts mounted on the other side. And 320. Here, the plurality of light receiving parts 31a to 31i are formed on the outer surface of the light receiving part mounting part 310 at predetermined height intervals, and the plurality of light emitting parts 32a to 32i are parallel to each of the light receiving parts at the same height. Is formed on the outer surface of the light emitting unit mounting portion 320 so as to correspond.

Therefore, the light emitting unit and the light receiving unit detect the golf ball in an oblique form without being parallel to the ground.

Here, the ninth sensors 31i and 32i formed at the bottom may be formed at a position lower than the golf ball diameter (42.67 mm) when the putting shot is performed, that is, the rolling ball is detected.

The club sensor and the golf ball sensor may be configured as an optical sensor including a light emitting unit and a light receiving unit.

-Golf ball travel distance calculation-

First, the average detection time of the second club sensor 21 and the first club sensor 22 at the moment of placing the golf ball in the center portion (A) of the pad portion 10, backswing and downswing the club impact. And the detection time of the ninth sensors 31i and 32i installed at the bottom of the golf ball detection sensor.

The difference between the detection time of the ninth sensors 31i and 32i for detecting the golf ball and the average detection time of the club detection sensor 21 and the distance from the golf ball to the golf ball detection sensors 31i and 32i. From (D), the speed (V, V = D / Δt) of the golf ball is calculated by the following equation. Here, D is a value that can be determined and stored according to the position where the golf ball sensor is installed.

When the speed is determined as described above, the traveling distance S of the golf ball can be calculated from the following kinetic energy conservation law (Equation 1).

Where m is the mass of the golf ball, μ is the coefficient of friction, and g is the gravitational acceleration.

The friction coefficient μ is selected from the friction coefficient values of the actual green input in advance and substituted into Equation 1. That is, when the user selects any one of three conditions of slow, normal, and fast of the green state input switch included in the control unit included in the display unit, the friction coefficient corresponding to the selected state is expressed by Equation 2 below. Can be obtained by

Here, the green speed can be obtained from a method for obtaining a golf course green speed using a steam meter in the actual golf course design. The steam meter is a tool designed to roll the golf ball. It is installed at an angle of about 20 degrees with respect to the golf course green. When the golf ball is rolled 90 cm along the steam meter from the ground, the golf ball moves down the slope. do.

The golf ball descended from the steam meter rolls the green, at which time the golf ball measures the length rolled to obtain the green speed.

In general, the green speed can be calculated as 3.2m for fast green, 2.6m for middle green, and 2m for slow green, and the friction coefficient (μ) can be calculated by substituting the above value in Equation 2 above. In this way, it is possible to calculate the moving distance (S) of the golf ball.

- Approach  Golf ball travel distance calculation

3 is a plan view of FIG. 1A, and FIG. 4 is a side view of FIG. 1A.

Referring to FIGS. 3 and 4, when the user attempts an approach shot, the user selects an appropriate club and places a golf ball on the pad center A.

The moment of backswing and downswing of the club is measured to measure the average detection time of the second club sensor 22 and the first club sensor 21 and the detection time of the golf ball sensor.

Here, in the case of the approach shot, the golf ball flies by drawing a parabola from the ground at impact, unlike putting. Therefore, in order to detect a golf ball, a golf ball detection sensor should be installed a plurality of sensors at a predetermined height interval from the ground.

In this embodiment, the vertical bar is installed in a state inclined 45 degrees from the ground, but the inclination angle of the vertical bar may be freely set between 0 and 90, and if the angle is too low, it does not detect a shot that is highly approached. If the angle is too high, it is difficult to arrange the light emitting part, so it is preferable to set it between 30 and 60.

Since the first to eighth sensors (the ninth sensor is formed at a height lower than the diameter of the golf ball to detect only the rolling golf ball) formed in the golf ball detection sensor according to an embodiment of the present invention, When a specific sensor detects a golf ball, the height (H) of the golf ball can be known, and since the distance (D) from the golf ball in the center of the mat to the first to eighth sensors can be known, respectively, the inclination angle of the golf ball The degree θ can be extracted.

Table 1 below is a specification table in which the first to ninth sensors according to the preferred embodiment of the present invention are disposed.

In Table 1, the distance (D) means the distance from the golf ball to each sensor, the height (H) means the height from the ground of each sensor, L is the left area, C is the center area, R Means the right area, the TAN ratio means the tangent value of each sensor according to the distance D and the height H, and the inclination angle θ represents the angle of the golf ball according to the tangent value.

When the approach shot is made using the specifications shown in Table 1, the sensor determines whether the shot corresponds to the left region L, the central region C, or the right region R, and detects a golf ball. By detecting the number of can determine the average value of the height and distance of the detected plurality of sensors as the height and distance, and calculates the inclination angle (θ) of the golf ball from the determined height and distance.

More specifically, the area determination determines whether the face state of the club is OPEN, CLOSED or SQUARE from the difference in sensor detection time between the second club detection sensor immediately before the impact, and immediately after the impact. It is determined by determining whether the face state of the club is open, closed or square from the sensor detection time difference between the first club detection sensor of the first club detection sensor.

5 is an exemplary view showing an area (direction) of a golf ball along a club face according to a preferred embodiment of the present invention.

Referring to FIG. 5, when the left sensor 212 is first detected among the sensors detecting both ends of the club head, the club corresponds to an open state, and when the right sensor 213 is detected first, the club is closed. It corresponds to a state and, if detected at the same time, corresponds to a SQUARE state.

If the face of the club is opened immediately before or immediately after the impact, the golf ball will fly to the right area R. If the club is closed, the golf ball will fly to the right area R. In the (SQUARE) state, the golf ball will fly to the center area (C). Therefore, it is possible to determine the area where the golf ball flies from the face state of the club.

<Table 2> is a table of areas according to the face state before and after impact.

When the area is determined as described above, the number of sensors that detect the golf ball is detected, and when the number of the detected sensors is odd, the tilt angle θ of the golf ball is calculated based on the sensor located at the center.

If the number is even, the tilt angle θ of the golf ball may be calculated based on the average value of the sensor at the highest position and the sensor at the lowest position.

For example, if the face immediately before and after the impact is in a square state, and the first to third sensors 31a, 31b, and 31c at the top of the golf ball detecting sensor are detected as shown in FIG. It is determined that the flying in (C), and with reference to the specification table on the basis of the second sensor 31b located in the center of the first to third sensors 31a, 31b, 31c, the inclination angle of the golf ball ( θ) can be measured.

Therefore, the second sensor in the region C has an inclination angle θ of 52 degrees and a distance D from the golf ball of 68 mm, so that the difference between the detection time of the golf ball sensor and the average detection time of the club sensor (Δt ) And the speed (V ₁ , V ₁ = 68 mm / Δt) of the golf ball from the golf ball and the distance (D) from the golf ball sensor to the golf ball detection sensor. ) Is 52 degrees.

As described above, the angle of inclination of the golf ball [θ, θ = tan ⁻¹ (H /) from the distance D from the golf ball to the golf ball sensor and the height H of the detected golf ball H as shown in the specification table. D)], and the speed V of the golf ball can be calculated by the same method as the speed of the golf ball at the time of putting.

By calculating the speed V and the inclination angle θ of the golf ball as described above, it is possible to calculate the horizontal distance to the falling point due to the parabolic motion and the expected distance that the golf ball will roll from the falling point.

A detailed movement distance calculation process will be described in detail with reference to FIG. 7.

Assuming that the velocity V of the golf ball calculated as described above is an initial velocity V ₀ , and that the parabolic motion is performed at an inclination angle θ, the horizontal reach distance ( S1) can be calculated.

More specifically, the solution of x when y = 0 in Equation 3 is

이 된다.x = 0,

Becomes

이 수평도달거리(S1)가 된다.Where X = 0 is the starting point,

This horizontal reach distance S1 is obtained.

And, since the speed (V ₁ ) of the golf ball at the horizontal reach point is the same as the speed of the component in the X direction can be obtained as follows.

V ₁ = V ₀ cosθ

As described above, when the speed V1 of the golf ball is calculated at the horizontal reach point, the distance in which the golf ball rolls from the horizontal reach point by inputting V = V1 and the friction coefficient μ of the turf in Equation 1 above. ) Can be calculated.

Therefore, in the case of the approach shot, the distance S reached by the golf ball is the sum of the horizontal reaching distance S ₁ due to the parabolic motion and the distance S ₂ rolling from the point where the golf ball is horizontally reached. 4>.

-Calculate backswing speed, downswing speed, swing rhythm, backswing size

The microprocessor calculates the backswing speed V _B using the difference between the average detection time of the second club detection sensor and the detection time difference Δt ₁ of the third club detection sensor at the start of the backswing.

That is, since the distance D ₂ from the golf ball to the third club sensor is already determined and stored by the microprocessor, the back swing speed V _B = D ₂ / Δt ₁ may be calculated.

Further, by the same method as described above, the difference between the detection time of the third club sensor and the average detection time of the second club sensor (Δt3) and the distance (D ₂ ) to the third club detection sensor during downswing. The down swing speed V _D , V _D = D ₂ / Δt ₂ can be calculated.

The swing rhythm is calculated from the difference between the average detection time Δt ₁ at the start of the backswing of the second club sensor and the average detection time Δt ₂ at the downswing.

In addition, the backswing size S _B can be calculated by the following Equation 5 from the backswing and downswing speed.

Golf ball Heating point  Calculation

The second club detection sensor which detects the club at the start of the backswing, downswing after the backswing, detects the club just before the impact, so that the club can know the degree of departure from the center.

More specifically, referring to FIG. 9, when the club center and the golf ball coincide with each other, only two pairs of first and second detection sensors 221a, 222a, 221b, and 222b which detect both ends of the club among the second club detection sensors are recognized. If the club is off the center, some of the two pairs of sensors 221a, 222a, 221b, and 222b are not recognized, but other sensors are recognized and the club is separated from the center.

If only the first detection sensor 221b is recognized at the left end of the club, and the first to third detection sensors 221a, 222a, and 223a are recognized at the right end of the club, the club head may be separated from the center to the right. On the contrary, if the first to third detection sensors 221b, 222b and 223b are recognized at the left end of the club and only the first detection sensor 221a is detected at the right end of the club, the club head may be separated from the center to the left.

Therefore, if the club head is in the center, the golf ball is centered in the center of the club. If the club head is off to the right, the golf ball is to the left of the club. If the club head is to the left, the golf ball is to the right of the club. As such, the microprocessor can determine and provide the heating point.

Although the detailed description of the present invention described above has been described with reference to the preferred embodiment of the present invention, the protection scope of the present invention is not limited to the above embodiment, and those skilled in the art will appreciate It will be understood that various modifications and changes can be made in the present invention without departing from the spirit and scope of the invention.

Figure 1a is a schematic diagram showing a golf short game practice apparatus according to a preferred embodiment of the present invention, Figure 1b is a block diagram of Figure 1a.

2 is a cross-sectional view of the club detector A-A 'of FIG. 1A.

3 is a plan view of FIG. 1A, and FIG. 4 is a side view of FIG. 1A.

5 is an exemplary view showing an area (direction) of a golf ball along a club face according to a preferred embodiment of the present invention.

6 is an exemplary view of sensing a golf ball according to a preferred embodiment of the present invention.

7 illustrates a parabolic trajectory of a golf ball according to a preferred embodiment of the present invention.

8 is an exemplary view for providing a face state and a heating point according to a preferred embodiment of the present invention.

9 is an exemplary view of the deviation detection of the club head according to a preferred embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

10: mat part 20: club detection unit

21: first club detection sensor 22: second club detection sensor

23: third club detection sensor 30: golf ball detection unit

310: light receiving unit mounting unit 320: light emitting unit mounting unit

40: microprocessor 50: display unit

Claims (11)

As a short game practice device that can play a short game by setting a golf ball in the center (A) of the mat, A club detector formed at the front of the center portion A to detect a club; Golf ball detectors formed on both sides of the mat front end; A microprocessor configured to calculate a short game analysis result from information sensed by the club detector and the golf ball detector; And a display unit for displaying a result of analyzing the short game calculated from the microprocessor. The method of claim 1, The club detection unit A golf short game practice device, characterized in that separated from the mat, the elastic member is formed on the lower portion. The method of claim 1, The club detection unit A first club detection sensor symmetrically formed about the center part on a first horizontal axis Y1 adjacent to the reference horizontal axis Y passing through the center part to sense both ends of the club head at the moment of impact; A second club sensor formed on the second horizontal axis (Y2) adjacent to the rear of the reference horizontal axis (Y) passing through the center to be symmetrical about the center to sense both ends of the club head at the start of the backswing and immediately before the impact; It is formed in the rear spaced apart from the center portion of the golf short game practice device comprising a third club sensor for sensing the club at the time of the backswing. The method of claim 3, wherein The second club detection sensor The golf short game practice apparatus further comprises at least one detection sensor adjacent to both sides of the second club sensor is formed to measure the degree of separation of the club from the center at impact. The method of claim 1, The golf ball detector A plurality of light receiving parts mounted on one side of the front end of the mat part, the light receiving part mounting part formed to be inclined to have a predetermined inclination, and a light emitting part mounting part having a plurality of light emitting parts mounted on the other side; The plurality of light receiving units are formed at predetermined height intervals on the outer surface of the light receiving unit mounting unit, And the plurality of light emitting parts are formed at the same height so as to correspond to each of the light receiving parts in parallel with each other. The method of claim 1, The microprocessor The golf ball using the distance (D ₁ ) between the golf ball sensor and the golf ball sensor using the detection time of the golf ball sensor and the average time difference (△ t) between the first club sensor and the second club sensor when putting Calculate the speed (V) of the golf ball, and calculates the expected travel distance (S) of the golf ball when putting the golf ball (V) in consideration of the average friction constant (μ) input according to the turf conditions. Golf short game practice device. The method of claim 1, The microprocessor The angle of inclination (θ) and the starting speed (V ₀ ) of the golf ball are calculated using the average detection time (△ t) of the first club sensor and the second club sensor and the sensing information of the golf ball sensor. ; The golf short game practice apparatus for calculating the horizontal distance (S ₁ ) from the inclination angle (θ) and the starting speed (V ₀ ) to the falling point of the golf ball by the parabolic motion. The method of claim 7, wherein The microprocessor The height (H) from the ground of each sensor for the plurality of golf ball detection sensors and the inclination angle (θ) value from the center are divided and stored in advance for each area (L, C, R), From the difference in detection time between the first and second club detection sensors immediately before or after the impact, the corresponding areas (L, C, R) are determined according to whether the face of the club is open, closed or square. If the number of sensing golf ball sensor is one, calculate the horizontal reach distance (S ₁ ) from the pre-stored height (H) and the inclination angle (θ) of the corresponding sensor to the falling point of the golf ball, and detects a large number A golf short game practice device, characterized in that the horizontal reach distance (S ₁ ) from the height (H) and the inclination angle (θ) the average of the sensor to the falling point of the golf ball. The method according to claim 7 or 8, The microprocessor Calculating a speed V ₁ at the falling point of the golf ball from the inclination angle θ and the starting speed V ₀ ; Using the speed (V ₁ ) of the dropping point and the average friction constant (μ) according to the turf conditions, the distance (S ₂ ) the golf ball rolls from the dropping point to the horizontal reach distance to the falling point of the golf ball Golf short game practice device, characterized in that to calculate the total travel distance (S) of the golf ball by summing with (S ₁ ). The method of claim 1, The microprocessor Using the distance (D ₂₎ to the third club sensor from backswing started when the second average detection time and the third detection time difference (△ t ₁₎ and the golf ball of the club detecting sensor of the club sensor back swing speed ( Calculate V _B ); Calculating a downswing speed V _D by using a difference time DELTA t ₂ between the sensing time of the third club detecting sensor and the second club detecting sensor during downswing; Golf back game practice apparatus, characterized in that for calculating the back swing size (S _B ) from the back swing and down swing speed (V _B , V _D ) and the average detection time difference (Δt ₁ , Δt ₂ ). The method of claim 1, The microprocessor Determining whether the face state of the club head is open, closed or square from the difference in the sensing time between the second club detecting sensor immediately before the impact; The golf short game practice apparatus, characterized in that it is determined whether the face state of the club head is open, closed or square from the difference in the detection time of both ends of the first club sensor immediately after the impact.

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