JPH04174682A - Golf swing analysis system - Google Patents

Abstract

PURPOSE:To detect minutely and accurately body weight movement conditions or the like at a golf swing impact time, and enable a testee to recognize them easily, by equipping a recording means which records with time the operation outcome of the testee in a swing and at the same time detects and records a golf swing impact time. CONSTITUTION:At a CPU 43, the detection data are recorded with a lapse of time, and at the same time a detection signal from an impact detection sensor 32 is taken in from an input/output device 42, and an impact time is set at the detection data that are with a lapse of time. The fall-point of synthetic load coincides approximately with a load change inflection point between both right and left legs. At the CPU 43, this timepoint is recognized as a top, and the data that is with time are tackled. Thus, gravity center movement conditions in which an address time and top time and impact time and finish time that are important in a swing, are clarified, can be detected. A memory means that memorizes gravity center movement condition data at every swing, is equipped, and the data can be taken out as a gravity center chart at the time of need, and comparison with other data and the simultaneous display of the gravity center chart are possible, which is the constitution.

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention is applicable to measuring changes in the weighted state during a test subject's golf swing, detecting the state of center of gravity movement, and analyzing defects in the test subject's golf swing. This relates to the equipment used.

[Prior Art] Most conventionally known golf swing analysis devices judge a test subject's golf swing only from imaging means using a television video camera.

However, with the spread of home video cameras in recent years, it has become easier to perform swing analysis using only images, but on the other hand, a more advanced swing analysis system is required.

For this reason, a system is known that measures the load applied to the left and right legs during the golf swing and changes in the load in order to detect the state of weight shift of the subject during the golf swing.

[Problems to be Solved by the Invention] In the above-mentioned conventional device, the load applied to each leg is measured using scales placed separately for each leg, so it is difficult to determine the load distribution at address and the golf swing. It is only possible to measure the state of weight shift in the left-right direction (flying ball direction).

However, since the golf swing consists of twisting movements of the subject's body, it is necessary to observe not only the left-right direction but also the state of weight shift in the front-back direction. Observation is preferred.

Furthermore, we can measure the timing of these weight shifts, the weight applied to each leg (for example, whether force is being applied to the soles of the feet), and the state of movement in more detail, and visually understand them. If possible, it will be possible to recognize the sensory golf swing more objectively, which will be an important point of judgment when analyzing the golf swing of the subject.

The present invention enables more detailed and accurate pressure detection of the state of weight movement during a golf swing, which was not possible with conventional devices.
The purpose of the present invention is to provide a device that allows subjects to be easily recognized.

[Means for Solving the Problem] In order to achieve the above object, the invention described in claim (1) of the present application calculates the golf swing of a subject from the measurement results by individual ground reaction force measuring means corresponding to the left and right legs of the subject. A golf swing analysis system for analyzing a golf swing of a subject by detecting the state of weight movement during the test, wherein each of the ground reaction force measuring means is arranged at three or more radial positions approximately centered on a pressurizing point. a calculating means for calculating the pressing force for each leg, the weighting point, or the center of gravity of the entire body from the measured values at each measurement point of the measuring means; The present invention is characterized by comprising a recording means for recording the calculation results over time during the golf swing, and for detecting and recording the time of impact of the golf swing.

In the invention set forth in claim (2) of the present application, the golf swing analysis system set forth in claim (1) is provided with an output means for outputting the recorded content as a center of gravity map.

In the invention as set forth in claim (3) of the present application, the golf swing analysis system as set forth in claim (2) is provided with a storage means for storing the calculation results, and the output means is configured to store the calculation result in the golf swing analysis system as set forth in claim (2). The configuration is such that the first calculation result and the second calculation result calculated for each swing can be output simultaneously.

[Operation] Since the present invention is configured as described above, the measurement value and the amount of change thereof at each measurement point are detected by the measurement means that measures the pressure force at three or more radial positions. Based on this detection result, it is possible to measure the distribution of the load applied to each leg and the amount of movement b<< in the entire circumferential direction.

Furthermore, by comprehensively calculating these, the position of the center of gravity of the entire body as well as the state of movement thereof can be detected.

Then, the state of the nine weighted points and the state of change as well as the state of change are output as a center of gravity map.

In addition, it is also possible to compare the results with other previous swings stored in the storage means.

Hereinafter, the present invention will be explained in more detail through Examples.

[Example] FIG. 1 shows an example of the present invention. In this embodiment, raw reaction force meters IL and IR corresponding to the right leg and left leg are respectively provided, and each raw reaction force meter has four load cells 2a.
~d, 2a'~d' are provided approximately radially around the pressurizing centers OL, OR. The subject steps on the floor reaction force meter IL, IR and performs a golf swing with the left and right legs (soles of the feet) positioned at the pressure centers OL, O*. At this time, it is desirable to take into consideration the differences in the physique of each subject and configure the system so that the interval (relative positional relationship) between the left and right raw reaction force gauges can be varied.

Next, a method for detecting the center of gravity position in this embodiment will be explained using FIG. 2.

First, if the output from each load cell 28-d, 2a'-d' is w1-w, w,'-W4', then the loads WL and WR on the left and right legs and the overall load are WL=W.
I +W2 -1"1l13 +I14wR=w,
' +w, ' +1l13°+w4゜w, = WL+
It is determined by wR.

Next, for the position of the center of gravity of each left and right leg, if the coordinates and relative positional relationship of each leg are determined as shown in Figures 1 and 2, the position of the center of gravity of the left leg (xt, yL) is %, (
Il+, +w3) ) X L2/1'lL! /L=
(1'l++flz-(L×W4)) X L
Similarly, the right leg center of gravity position (XR, yR
) can also be found.

Furthermore, from these results, the overall center of gravity position (X, , Y
A) is obtained from the coordinate system shown in Figure 2 (B), ×1= (stomach R/wA) X (L3-XL+XR
) L3/2+XLYA= (wst/ wA
) × (3'R' Vt,) + Vi.

becomes.

As described above, the position of the center of gravity of each of the left and right legs and the position of the center of gravity of the entire body can be determined based on the measurement results from the original reaction force meters IL and IR.

During the subject's golf swing, that is, from the start of the backswing from the address state to the top, through the downswing from the top, after impact, through the follow-through, and to the finish, the above measurement and calculation results were obtained. By recording this over time, it is possible to measure changes in the center of gravity during the swing.

Incidentally, when analyzing a golf swing, the movement of the center of gravity during the swing as well as the swing conditions particularly at the time of address, top, impact, and finish are important issues. When determining the center of gravity position during a swing using the above device, it is easy to detect at address and finish as it captures the front and back of the movement, but at the top and impact it can be easily detected. Because they are located in the middle, they are often difficult to detect.

Therefore, in this embodiment, a separate detection means is provided for impact detection.

Figure 'tS3 shows an example of the impact detection means. Here, it is assumed that the test subject placed on the floor reaction force meter IL, IR will actually hit the ball and perform a swing analysis. On the other hand, the optical sensor 32 is used to detect the point in time when the ball 31 is actually hit (at the time of impact).

In this embodiment, the ball 31 is irradiated with detection light from the lateral direction, but the invention is not limited to this method.

However, although there is a conventional method in which an optical sensor is embedded in the lower part of the ball placement section, this method has a problem in that dust and other foreign matter easily enter the detection section of the optical sensor. Furthermore, there are conventional examples of configurations in which a metal sensor is used to detect the passage of a club, but this requires the detection part to be brought close to the ball, which poses a problem of making the subject feel uneasy. Furthermore, in these two conventional methods, there is a risk that the subject may accidentally hit a part other than the ball with a club (in the case of so-called duffling), and there is a problem that there is a high possibility that the detection unit will be damaged. This embodiment has the advantage of solving these problems.

The time of impact detected here is incorporated into the previous data on the movement of the center of gravity over time, so that the time of impact can be clearly determined.

FIG. 4 shows an outline of the system configuration of this embodiment. In this embodiment, the detection outputs from the left and right original reaction force meters IL and IR are input to the A/D converter 42, and the CPU outputs them as detection data.
43. The CPLI 43 records this detection data over time, and also records the detection data over time.
The detection signal from the input/output device 42 is taken in from the input/output device 42, and the time of impact is set in the detection data over time.

This clarifies the time of impact during the chronological recording of detection data.

On the other hand, at the top of the swing, the top of the swing is generally a transition from a backswing (performed by twisting the body to the right) to a downswing (performing by twisting the body to the left). It is considered to be a point (or a turning point).

Therefore, in this example, from the recording of the temporally detected data, it is considered that the change in the load between the left and right legs or the change point in the total load indicates the top of the swing.An example of this temporally detected data is shown in the fifth example. It is shown in Figure 2. In the figure, the point where the total load drops almost coincides with the inflection point of the load change between the left and right legs.In other words, this point can be considered the top of the swing, so the CPU 43 Recognize this point as the top and work on data over time.

As described above, it is possible to detect the center of gravity movement state in which the important address, top, impact, and finish times during the swing are clarified.

Next, an example in which the movement state (trajectory) of the center of gravity during these swings is displayed as a center of gravity map will be explained using FIG. 6.

In this figure, the left leg center of gravity shift state is shown by line 61, the right leg center of gravity shift state is shown by line 62, and the total center of gravity shift state is shown by line 63. In addition, the front and left and right directions are shown in consideration of ease of recognition by subjects and the like.

In 1g61 to 1g63 showing these center of gravity movement states, the time at the top is indicated by rXJ, and the time at impact is indicated by r10-.

This center of gravity map is displayed on the CRT 44 or printer 45 and shown to the subject.

Looking at the center of gravity (moving state) diagram displayed in this way, the subject can see the center of gravity 8 during his own golf swing.
The operating status can be recognized at a glance.

Furthermore, it is also possible to indicate the weight ratio (%) applied to both the left and right legs during the swing as a numerical value.

By the way, this embodiment is equipped with a storage means for storing the data of the center of gravity movement state for each swing, so that the data can be retrieved as a center of gravity map when necessary, and furthermore, it can be compared with other data. The configuration allows the center of gravity map to be displayed at the same time.

Therefore, if the data is stored as data for each swing and taken out and compared when necessary, it will be effective in determining the results of practice and the cause of poor performance. Furthermore, if the swing data of professional players and advanced players is stored, there is an advantage that swing analysis can be made more sophisticated and clear by comparison with data of test subjects.

[Effects of the Invention] As explained above, according to the invention described in claim (1) of the present application, it is possible to clearly detect the state of movement of the center of gravity of the subject during the swing. Therefore, there is an advantage that swing analysis can be easily performed by recognizing defects in the state of center of gravity movement.

Further, according to the invention described in claim (2) of the present application, the subject can very easily recognize the state of movement of the center of gravity during a swing from the center of gravity map subjected to eight forces.

Furthermore, according to the invention described in claim (3), past swings and data of professional players, advanced players, etc. can be stored and output at the same time as the individual swing data of the test subject for direct comparison. Therefore, it has the advantage of being an effective judgment material for swing analysis of the subject.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a barber dynamometer of a golf swing analysis system according to an embodiment of the present invention, FIG. 2 is an explanatory diagram showing a method of detecting the center of gravity according to an embodiment, and FIG. An explanatory diagram showing the impact detection means of the example, FIG. 4 is a block diagram showing the configuration of the embodiment, FIG. 5 is a diagram showing the load change state in the embodiment, and FIG. 6 is the diagram of the embodiment. It is an explanatory view showing an example of a center of gravity diagram in . [Explanation of symbols of main parts] IL, IR...floor reaction force meter, 2a-d, a'-d°...load cell, 32...
optical sensor,

Claims (3)

[Claims] (1) A golf swing analysis system that analyzes the subject's golf swing by detecting the state of weight shift during the subject's golf swing from the measurement results obtained by individual ground reaction force measuring means corresponding to the subject's left and right legs. Each of the floor reaction force measuring means has a measuring means for individually measuring the pressurizing force at three or more radial positions approximately centered on the pressurizing point, and the measurement at each measuring point of the measuring means A calculation means for calculating the pressing force for each leg, weighted point, or center of gravity of the entire body from the value; A golf swing analysis system comprising a recording means for detecting and recording. (2) The golf swing analysis system according to claim (1), further comprising an output means for outputting the recorded content as a center of gravity map. (3) The golf swing analysis system according to claim (2), further comprising a storage means for storing the calculation result, and wherein the output means stores the first calculation result stored in the storage means and the golf swing analysis system. A golf swing analysis system characterized in that it is configured to be able to simultaneously output a second calculation result calculated at each time.