JP2012200540A - Swing analyzing system and swing analyzing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To predict the speed of a tip of a playing tool from the measured acceleration of a player's hand.SOLUTION: Provided are: an acceleration sensor 2 that is mounted on a player's hand to measure acceleration; a communication part 11 that receives the measured acceleration from the acceleration sensor 2 as acceleration information; an analyzing part 13 that calculates the acceleration of the tip of the playing tool that the player swings, on the basis of the acceleration information received by the communication part 11; and a display part 14 that displays the speed calculated by the analyzing part 13, wherein the acceleration sensor 2 measures acceleration in a first direction from the wrist on the back of the player's hand to the direction of the base of finger and acceleration in a second direction orthogonal to both directions substantially parallel to the first direction and the back of the player's left hand, and the analyzing part 13 calculates, based on the acceleration in the first direction and the acceleration in the second direction, the speed of the tip of the playing tool that the player swings.

Description

  The present invention relates to a swing analysis system and a swing analysis apparatus for analyzing a swing of a player's game equipment in a game such as golf or baseball using a game tool that hits a ball or the like.

  In the conventional swing analysis system, acceleration sensors are mounted at two locations on the back of the arm and back of the hand near the athlete's joint, and the angle of the joint during the swing is calculated from the two accelerations measured by the acceleration sensor. There is one that analyzes the swing performed by (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 2001-614 (paragraphs “0016” to “0045”, FIGS. 1, 9, and 10)

However, in the above-described conventional technology, an acceleration sensor is attached to two locations of the athlete's arm and back of the hand, and the swing performed by the athlete is calculated by calculating the angle of the joint during the swing from the acceleration of the two locations. Although there was a problem, there is a problem that the speed of the tip of the competition equipment on which the athlete swings cannot be predicted.
An object of the present invention is to solve such a problem, and an object of the present invention is to predict the speed of the front end of the competition equipment from the measured acceleration of the athlete's hand.

  Therefore, the present invention provides a swing analysis system for analyzing a swing from an acceleration measured by an acceleration measuring means attached to the athlete's body, an acceleration measuring means attached to the athlete's hand and measuring the acceleration, A communication unit that receives the acceleration measured from the acceleration measuring means as acceleration information; and an analysis unit that calculates the speed of the tip of the competition equipment that the athlete swings based on the acceleration information received by the communication unit; Output means for displaying the velocity calculated by the analysis unit, and the acceleration measuring means includes an acceleration in a first direction from a wrist to a base of a finger on the back of the player's hand, and the first direction. And an acceleration in a second direction orthogonal to the direction substantially parallel to the back of the left hand of the athlete, and the analysis unit adds the first direction. The competitor based on the acceleration in degrees and the second direction and calculates the speed of the tip of competition tool to swing.

  According to the present invention as described above, an effect that the speed of the tip of the competition equipment can be predicted from the measured acceleration of the athlete's hand can be obtained.

The block diagram which shows the structure of the swing analysis system and swing analysis apparatus in an Example Explanatory drawing of the acceleration sensor arranged in the player's hand in the embodiment Explanatory drawing which shows the change of the acceleration at the time of a swing in an Example. Explanatory drawing which shows the change of the acceleration at the time of a backswing in an Example. Explanatory drawing which shows the change of the acceleration at the time of a backswing in an Example. Explanatory drawing which shows the change of the acceleration at the time of a downswing in an Example Explanatory drawing which shows the change of the acceleration at the time of a downswing in an Example Explanatory drawing which shows the change of the acceleration at the time of impact in an Example Explanatory drawing which shows the change of the acceleration at the time of impact in an Example Explanatory drawing of head speed prediction in the embodiment Illustration of the display screen in the embodiment Illustration of the display screen in the embodiment

  Embodiments of a swing analysis system and a swing analysis device according to the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram illustrating a configuration of a swing analysis system and a swing analysis device in the embodiment.
In FIG. 1, reference numeral 1 denotes a swing analysis device, which analyzes the posture of a player who swings a game tool that strikes a ball or the like in a game such as golf or baseball, and predicts the speed of the tip of the game tool. In this embodiment, it is assumed that the competition is golf, the posture of the player who swings the golf club as the competition equipment is analyzed, and the speed of the tip of the golf club at the time of hitting the golf ball is predicted.

  Reference numeral 2 denotes an acceleration sensor as an acceleration measuring unit, which is an acceleration sensor capable of measuring (measuring) acceleration in three directions of the X axis, the Y axis, and the Z axis. The acceleration sensor 2 can transmit information on accelerations in three directions measured at predetermined sampling times to the swing analysis apparatus 1 via a communication line 3 such as a wireless communication line. Therefore, time information is also included in the acceleration information transmitted from the acceleration sensor 2. In the present embodiment, for example, as shown in FIG. 2, the acceleration sensor 2 is described as being arranged on the back of the player's left hand, but may be arranged on the back of the player's right hand.

  Here, the X axis is the direction from the wrist to the base of the finger (first direction) on the back of the athlete's left hand, and the Y axis is orthogonal to the X axis and substantially parallel to the back of the athlete's left hand. Direction (third direction), and the Z-axis is a direction orthogonal to the X-axis and Y-axis, that is, a direction orthogonal to the X-axis direction and the direction substantially parallel to the back of the left hand of the player 2 direction). Therefore, the X axis, the Y axis, and the Z axis are orthogonal to the other two directions.

  In addition, as shown in FIG. 2, the positive direction of the X-axis is the direction from the wrist to the fingertip on the back of the player's left hand, the negative direction of the X-axis is the direction from the fingertip to the wrist of the player's left hand The positive direction is the body direction from the left hand on the back of the athlete's left hand, the negative direction of the Y-axis is the front direction from the left hand on the back of the athlete's left hand, and the positive direction of the Z-axis is the left hand on the back of the athlete's left hand The direction opposite to the right hand (left side of the body) and the negative direction of the Z-axis are from the left hand to the right hand (right side of the body) on the back of the player's left hand.

The acceleration sensor 2 is attached to a glove or the like, and the athlete wears the glove. Further, the acceleration sensor 2 may transmit the measured acceleration information to the swing analysis apparatus 1 via a wired line instead of a wireless communication line.
As described above, the swing analysis system includes the swing analysis device 1, the acceleration sensor 2, and the communication line 3 that connects the swing analysis device 1 and the acceleration sensor 2 so that they can communicate with each other.

The swing analysis apparatus 1 includes a communication unit 11, a storage unit 12, an analysis unit 13, a display unit 14, and a control unit 15. The swing analysis apparatus 1 is, for example, a computer that includes a communication unit 11, a storage unit 12, an analysis unit 13, a display unit 14, and a control unit 15.
The communication unit 11 performs transmission / reception control of information with the acceleration sensor 2 via the communication line 3 and receives acceleration information transmitted from the acceleration sensor 2 as acceleration information.

The storage unit 12 is a storage unit configured by a memory or the like, stores information on acceleration received from the acceleration sensor 2 by the communication unit 11, and controls a control program (software) for controlling the overall operation of the swing analysis apparatus 1. ), Control information, and the like.
The analysis unit 13 analyzes the athlete's swing based on the acceleration information stored in the storage unit 12 and calculates and predicts the tip speed of the competition equipment. The analysis unit 13 extracts information representing the passage of time and information representing the acceleration from the acceleration information stored in the storage unit 12, and further changes the X-axis, the Y-axis, The Z-axis acceleration information is extracted, the athlete's swing is analyzed based on the extracted X-axis, Y-axis, and Z-axis acceleration information, and the tip speed of the competition equipment is predicted.

The display unit 14 is a display output unit such as a liquid crystal display. The display unit 14 displays acceleration information stored in the storage unit 12 and is calculated by the information about the athlete's swing analyzed by the analysis unit 13 and the analysis unit 13. The predicted speed of the tip of the competition equipment is displayed.
The control unit 15 is a calculation unit and control unit such as a CPU (Central Processing Unit), and controls the overall operation of the swing analysis apparatus 1 based on a control program (software), control information, and the like stored in the storage unit 12. Is.

  The swing analysis apparatus 1 configured as described above receives information on acceleration in three directions measured at a predetermined cycle time from the acceleration sensor 2 by the communication unit 11 and stores the information in the storage unit 12. The analysis unit 13 stores the information. The player's swing is analyzed from the information on the accelerations in the three directions stored in the unit 12, the speed of the tip of the competition equipment is predicted, and the result is displayed on the display unit 14. Therefore, the player can correct his / her swing based on the information displayed on the display unit 14 of the swing analysis apparatus 1.

The effect | action of the structure mentioned above is demonstrated based on FIGS.
3 to 11, the horizontal axis indicates the passage of time, and the vertical axis indicates acceleration (one scale on the vertical axis is 1.0 G (1.0 G = 9.8 m / s ² : gravitational acceleration)). . Further, the broken line in the figure indicates the acceleration in the X-axis direction, the solid line indicates the acceleration in the Y-axis direction, and the alternate long and short dash line indicates the acceleration in the Z-axis direction.

  First, an analysis process of the entire swing performed by the control unit and the analysis unit of the swing analyzing apparatus will be described with reference to FIG. 1 based on an explanatory diagram showing a change in acceleration during a swing in the embodiment of FIG. In the following description, the athlete performs a swing, and the swing analysis apparatus 1 receives information on acceleration associated with the swing performed by the athlete from the acceleration sensor 2 by the communication unit 11 and stores the information in the storage unit 12. It shall be.

  The analysis unit 13 of the swing analysis apparatus 1 extracts the acceleration in the X-axis direction, the acceleration in the Y-axis direction, and the acceleration in the Z-axis direction from the acceleration information stored in the storage unit 12 according to an instruction from the control unit 15. Then, a graph representing changes in acceleration on the X, Y, and Z axes extracted with the horizontal axis representing time and the vertical axis representing acceleration is created. FIG. 3 shows an example in which the created graph is displayed on the display unit 14.

  In FIG. 3, T1 indicates a swing (back swing) start time, T2 indicates a back swing end time, T3 indicates a hit time when the golf club hits (impacts) the golf ball, and T4 indicates a swing end time. Further, the backswing is from T1 to T2, the downswing is from T2 to T3, and the follow after impact is from T3 to T4.

Based on the acceleration information stored in the storage unit 12, the analysis unit 13 generates a change in acceleration in the X-axis direction, the Y-axis direction, or the Z-axis direction over time. The time point to be detected is detected, and that time point is defined as T1 (start of swing).
The analysis unit 13 further proceeds with analysis of the acceleration information stored in the storage unit 12, and the combined acceleration immediately before the value of the combined acceleration in the three directions of the X axis, the Y axis, and the Z axis is the largest. A time point where the value is about 1 G (9.8 m / s ² ) is detected, and that time point is defined as T2 (end of backswing). Here, the combined acceleration in the three directions of the X axis, the Y axis, and the Z axis is the square root of the sum of the squares of the respective accelerations in the three directions of the X axis, the Y axis, and the Z axis.

The analysis unit 13 further proceeds to analyze the acceleration information stored in the storage unit 12, and the acceleration is measured from the vicinity of the peak where the absolute value of the acceleration in the Z-axis direction is maximum (for example, about minus 9G shown in FIG. 3). A time point when a predetermined time (for example, 10 ms) has elapsed from the time point when the change occurs is detected, and that time point is set as T3 (impact).
The analysis unit 13 further proceeds with the analysis of the acceleration information stored in the storage unit 12 to detect a time point at which changes in the X-axis direction acceleration, the Y-axis direction acceleration, and the Z-axis direction acceleration substantially converge, The time is T4 (end of swing).

Next, the analysis unit 13 of the swing analysis apparatus 1 illustrated in FIG. 1 performs a process of extracting features in the backswing from the acceleration information stored in the storage unit 12 according to an instruction from the control unit 15. The process will be described with reference to FIG. 1 on the basis of an explanatory diagram showing a change in acceleration during backswing in the embodiment of FIGS.
The analysis unit 13 of the swing analysis device 1 plays the competition based on the characteristics of the backswing, that is, the acceleration changes in the X-axis direction, the Y-axis direction, and the Z-axis direction, from the detected acceleration information between T1 and T2 shown in FIG. The movement of the wrist of a person.

For example, as shown in FIG. 4, when the analysis unit 13 detects that changes in acceleration in the Y-axis direction and the Z-axis direction are generated substantially simultaneously, a so-called cock in which the left wrist of the player is bent to the thumb side. Detect that has occurred.
Further, as shown in FIG. 5, when the analysis unit 13 detects that the change in the acceleration in the Z-axis direction occurs behind the change in the acceleration in the Y-axis direction, the player's left wrist is cocked. Detect not.

Next, the analysis unit 13 of the swing analysis apparatus 1 illustrated in FIG. 1 performs a process of extracting features in the downswing from the acceleration information stored in the storage unit 12 according to an instruction from the control unit 15. The process will be described with reference to FIG. 1 based on the explanatory view showing the change in acceleration during the downswing in the embodiment of FIGS.
The analysis unit 13 of the swing analysis apparatus 1 plays a competition based on the detected information on the acceleration between T2 and T3 shown in FIG. 2 based on downswing characteristics, that is, changes in acceleration in the X-axis direction, the Y-axis direction, and the Z-axis direction. The movement of the wrist of the athlete, that is, the release time of the cock of the left hand of the competitor is extracted.

For example, as shown in FIGS. 6A and 6C, when the analysis unit 13 detects that the acceleration in the Y-axis direction is positive during the downswing, the left hand of the player shown in FIG. It is detected that there is a so-called tart with a slow release of the cock.
Further, as shown in FIGS. 7A and 7C, when the analysis unit 13 detects that the acceleration in the Y-axis direction is negative during the downswing, FIG. 7B shows the left hand cock of the player. It is detected that there is no so-called game that releases quickly.

The analysis unit 13 of the swing analyzing apparatus 1 extracts the characteristics of the athlete's swing from the measured acceleration information in the X-axis, Y-axis, and Z-axis directions of the athlete's swing, and the extracted characteristics on the display unit 14 are shown in FIG. And it displays with a moving image as shown in FIG.
FIG. 11 shows an example in which the left wrist of the competitor cocks and the swing with the slow release of the cock is displayed on the display unit 14 as a moving image, and FIG. 12 shows that there is no cock on the left wrist of the competitor, Moreover, the example which displays on the display part 14 with a moving image the swing which does not have a result is shown.

  As described above, the swing analysis apparatus 1 extracts the characteristics of the athlete's swing from the measured acceleration information in the X-axis, Y-axis, and Z-axis directions of the athlete, and displays the extracted characteristics on the display unit 14. This makes it possible to inform the player of the characteristics of the swing.

  Next, the analysis unit 13 of the swing analysis apparatus 1 illustrated in FIG. 1 performs a process of extracting features before impact from the information on the acceleration in the X-axis direction stored in the storage unit 12 according to an instruction from the control unit 15. The process will be described with reference to FIG. 1 based on an explanatory diagram showing a change in acceleration upon impact in the embodiment of FIG.

The analysis unit 13 of the swing analysis apparatus 1 calculates the head speed of the golf club on which the player swings from the characteristics before impact, that is, the change in acceleration in the X-axis direction, from the detected acceleration information in the vicinity of T3 shown in FIG. Extract features for
As the peak of acceleration in the X-axis direction before impact increases, the moving speed of the player's left hand increases, and the head speed of the golf club on which the player swings increases, so the analysis unit 13 determines the X-axis before impact. Detect peak acceleration in direction.

  For example, as shown in FIGS. 8A to 8C, the analysis unit 13 detects an acceleration peak (hereinafter referred to as “X-axis peak”) 81 in the X-axis direction before impact. It is detected that the X-axis peak 81 is, for example, plus 10G (FIG. 8A), plus 5.1G (FIG. 8B), plus 3.9G (FIG. 8C).

Next, the analysis unit 13 of the swing analysis apparatus 1 illustrated in FIG. 1 performs a process of extracting features before impact from information on acceleration in the Z-axis direction stored in the storage unit 12 according to an instruction from the control unit 15. The process will be described with reference to FIG. 1 based on an explanatory diagram showing a change in acceleration at impact in the embodiment of FIG.
The analysis unit 13 of the swing analysis device 1 calculates the head speed of the golf club on which the player swings from the characteristics before the impact, that is, the change in acceleration in the Z-axis direction, from the detected acceleration information before T3 shown in FIG. Extract features for

As the acceleration value in the Z-axis direction before impact changes from a large value to a small value, the competitor's cock is released more sharply, and the head speed is increased by turning the wrist when the cock is released. Is the rate of change of acceleration in the Z-axis direction before impact, that is, the slope (hereinafter referred to as “Z-axis slope”) 91.
For example, as shown in FIGS. 9A and 9B, the analysis unit 13 derives the Z-axis inclination 91 before impact.

  Furthermore, the analysis unit 13 of the swing analysis apparatus 1 illustrated in FIG. 1 performs a process of extracting a pre-impact feature from the Z-axis direction acceleration information stored in the storage unit 12 according to an instruction from the control unit 15. The process will be described with reference to FIG. 1 based on an explanatory diagram showing a change in acceleration at impact in the embodiment of FIG.

The analysis unit 13 of the swing analysis apparatus 1 calculates the head speed of the golf club on which the player swings from the characteristics before impact, that is, the change in acceleration in the Z-axis direction, from the detected acceleration information in the vicinity of T3 shown in FIG. Extract features for
The analysis unit 13 performs the impact from the time when the acceleration value in the Z-axis direction before the impact starts to change (change start point), and from the time when the value begins to decrease (hereinafter referred to as the “down start point”) in the present embodiment. An area 92 (hereinafter referred to as “Z-axis area”) 92 surrounded by the horizontal axis representing the descending start point G up to T3 and the Z-axis acceleration is derived.

For example, as shown in FIG. 10, the analysis unit 13 determines the acceleration in the Z-axis direction from the time when the value of the acceleration in the Z-axis direction before the impact falls below the G at the descent start point to the impact T3 and the G at the descent start point. The Z-axis area 92 is derived from the integrated value obtained by integrating the difference between the two.
As described above, the analysis unit 13 derives the X-axis peak 81, the Z-axis inclination 91, and the Z-axis area 92 shown in FIG. 10 from the acceleration information in the X-axis direction and the Z-axis direction.

Next, the analysis unit 13 performs processing for predicting the head speed of the golf club on which the player swings based on the derived X-axis peak 81, Z-axis inclination 91, and Z-axis area 92.
The analysis unit 13 calculates the left hand speed Vh from the derived X-axis peak 81. The velocity Vh (m / s) of the left hand is calculated by (angular velocity (rad / s) × the length of the player's hand (m)), and the angular velocity is ((X-axis peak-fixed value (0. 8G)) × 9.8 (m / s ² ) / Athlete's hand length (m)).

Here, the length (m) of the athlete's hand is the distance between the midpoint of the athlete's shoulders and the acceleration sensor 2, and is set to 0.75 m, for example, in this embodiment.
The analysis unit 13 that has calculated the left hand speed Vh calculates the head speed Vc. The head speed Vc is, for example, given that the Z-axis inclination 91 is Az and the Z-axis area 92 is Sz.
Vc = ((k1 * Vh) + (k2 * Az) + (k3 * Vh * Az) + (k4 * Sz) + k5) * k6.

Note that k1, k2, k3, k4, and k5 are constants and are determined by multiple regression analysis. K6 is a ratio according to the length of the club. Further, the formula for calculating the head speed Vc is not limited to the above formula, and may be another calculation formula using the Z-axis inclination 91 and the Z-axis area 92.
In this way, the analysis unit 13 of the swing analysis device 1 calculates the head speed of the golf club on which the player swings from the information on the acceleration in the X-axis direction and the Z-axis direction.
The control unit 15 of the swing analyzing apparatus 1 displays the head speed calculated by the analyzing unit 13 on the display unit 14 and notifies the player.

The swing of the expert is measured by the acceleration sensor 2, and the measured acceleration information in the X-axis, Y-axis, and Z-axis directions of the expert's swing is stored in the storage unit 12 in advance as reference acceleration information for analysis. The unit 13 compares the measured acceleration information in the X-axis, Y-axis, and Z-axis directions of the athlete's swing with the reference acceleration information stored in the storage unit 12, and extracts the characteristics of the athlete's swing. The feature extracted on the display unit 14 may be displayed as a message.
Further, the analysis unit 13 of the swing analysis device 1 may calculate the flight distance of the ball from the calculated head speed of the golf club.

As described above, in the present embodiment, an effect that the speed of the tip of the competition equipment can be predicted from the acceleration of the athlete's hand measured by the acceleration sensor is obtained.
In this embodiment, the acceleration sensor and the swing analysis device are separated from each other. However, the acceleration sensor and the swing analysis device may be integrated and attached to the player's hand.
In this embodiment, the acceleration sensor is described as being mounted on the back of the player's hand, but may be mounted on the grip of a golf club.

DESCRIPTION OF SYMBOLS 1 Swing analyzer 2 Acceleration sensor 3 Communication line 11 Communication part 12 Memory | storage part 13 Analysis part 14 Display part 15 Control part

Claims (8)

In the swing analysis system that analyzes the swing from the acceleration measured by the acceleration measuring means attached to the athlete's body,
Acceleration measuring means mounted on the athlete's hand and measuring acceleration;
A communication unit that receives acceleration measured from the acceleration measuring means as acceleration information;
An analysis unit that calculates the speed of the tip of the competition equipment that the athlete swings based on the acceleration information received by the communication unit;
Output means for displaying the speed calculated by the analysis unit,
The acceleration measuring means is orthogonal to the acceleration in the first direction from the wrist to the base of the finger on the back of the player's hand, and to both directions in the first direction and the direction substantially parallel to the back of the left hand of the player. Measure the acceleration in the second direction of direction,
The analysis unit calculates a speed of a tip of a competition equipment on which the player swings based on the acceleration in the first direction and the acceleration in the second direction. The swing analysis system according to claim 1,
The swing is a golf swing;
The analysis unit detects a maximum value of the absolute value of the second acceleration and extracts a hitting time point at which the player hits a ball placed in front of the player with a competition tool,
Before the hitting time, the maximum value of acceleration in the first direction, the rate of change in acceleration in the second direction, the acceleration in the second direction, and the start of change in acceleration in the second direction A swing analysis system characterized in that a speed of a tip of a competition equipment on which the athlete swings is calculated based on an integral value of a difference from acceleration. The swing analysis system according to claim 2,
The acceleration measuring means measures acceleration in a third direction orthogonal to both the first direction and the second direction in addition to the acceleration in the first direction and the acceleration in the second direction. And
The analysis unit detects a swing start time at which a change in acceleration occurs in any one of the acceleration in the first direction, the acceleration in the second direction, and the acceleration in the third direction, and then The value of the combined acceleration immediately before the value of the combined acceleration of the acceleration in the first direction, the acceleration in the second direction, and the acceleration in the third direction is maximized is about 9.8 m / s ^2. Detects the end of the backswing,
Between the start of the swing and the end of the backswing, it is detected that changes in the acceleration in the second direction and the acceleration in the third direction occur substantially simultaneously, and the left wrist of the player is detected. A swing analysis system that detects that a finger is bent to the thumb side. In the swing analysis system of claim 3,
The analysis unit detects a release time of the player's left wrist bending based on a change in acceleration in the third direction from the backswing end time to the hitting time point. Analysis system. In the swing analysis device that analyzes the characteristics of the swing from the acceleration measured by the acceleration measuring means mounted on the athlete's body,
A communication unit that is worn on the athlete's hand and receives acceleration measured as acceleration information from the acceleration measuring means for measuring acceleration;
An analysis unit that calculates the speed of the tip of the competition equipment that the athlete swings based on the acceleration information received by the communication unit;
Output means for displaying the speed calculated by the analysis unit,
The acceleration measuring means is orthogonal to the acceleration in the first direction from the wrist to the base of the finger on the back of the player's hand, and to both directions in the first direction and the direction substantially parallel to the back of the left hand of the player. Measure the acceleration in the second direction of direction,
The analysis unit calculates a speed of a tip of a competition equipment on which the player swings based on the acceleration in the first direction and the acceleration in the second direction. In the swing analysis apparatus according to claim 5,
The swing is a golf swing;
The analysis unit detects a maximum value of the absolute value of the second acceleration and extracts a hitting time point at which the player hits a ball placed in front of the player with a competition tool,
Before the hitting time, the maximum value of acceleration in the first direction, the rate of change in acceleration in the second direction, the acceleration in the second direction, and the start of change in acceleration in the second direction A swing analysis device that calculates a speed of a tip of a competition equipment on which the player swings based on an integral value of a difference from acceleration. In the swing analysis apparatus according to claim 6,
The acceleration measuring means measures acceleration in a third direction orthogonal to both the first direction and the second direction in addition to the acceleration in the first direction and the acceleration in the second direction. And
The analysis unit detects a swing start time at which a change in acceleration occurs in any one of the acceleration in the first direction, the acceleration in the second direction, and the acceleration in the third direction, and then The value of the combined acceleration immediately before the value of the combined acceleration of the acceleration in the first direction, the acceleration in the second direction, and the acceleration in the third direction is maximized is about 9.8 m / s ^2. Detects the end of the backswing,
Between the start of the swing and the end of the backswing, it is detected that changes in the acceleration in the second direction and the acceleration in the third direction occur substantially simultaneously, and the left wrist of the player is detected. A swing analyzing apparatus characterized by detecting that the finger is bent to the thumb side. The swing analysis apparatus according to claim 7,
The analysis unit detects a release time of the player's left wrist bending based on a change in acceleration in the third direction from the backswing end time to the hitting time point. Analysis device.

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