JPH0357468A - Head speed display machine - Google Patents

Abstract

PURPOSE:To obtain a head speed display machine which judges whether a golf swing posture is satisfactory or not and becomes aid for improving it by an arithmetic means for estimating a head speed by using a description of a correlation of a load measured value at the time of impact and the head speed from an output of a load measuring base in the impact time point detected by a head detector, and a display device. CONSTITUTION:The instant a club head impacts a ball on a tee, a head detector 2 detects passing of the head and detects an impact time point. The load of a person to be tested in this case is derived by totaling measured outputs of the respective load calls 12-15 provided on a load measuring base 1. The operation can be executed easily by an arithmetic processing means 31 of an arithmetic means 3. The arithmetic means is provided with a storage means 33, as well, and a correlation expression or a correlation table for describing a correlation of a load measured value and a head speed is recorded therein, therefore, the arithmetic processing means selects and reads out the expression or the table conforming to data of the kind of a club, etc., given specially from therein, applies a load at the time of impact thereto and estimates the head speed. The result of estimation of thee head speed is displayed on a two-dimensional display device 4 so as to be easily understandable.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a head speed display device configured to be able to estimate and display head speed without adding any special measuring mechanism.

[Conventional technology]

The quality of a golf swing is greatly influenced by the movement of the center of gravity or the load, so a golf swing diagnostic device has been developed that measures and displays changes in the center of gravity or load during a swing, and is useful for swing practice and correction. ing. These golf swing diagnostic machines usually use the test subject's load,
A load sensor is attached to detect the center of gravity.

By the way, the flight distance of the ball is strongly correlated with the speed of the club head at the moment of impact on the ball.
Measuring head speed is essential for diagnosing the above-mentioned swing.

Conventionally, for the head speed display function attached to such golf swing diagnostic devices, sensors that detect the passage of the head, such as optical or magnetic sensors, are installed at two locations near the impact, and these two sensors are connected to the head. It was common to calculate it from the time it takes for it to pass.

[Problem to be solved by the invention]

Therefore, the object of the present invention is to make it possible to utilize the sensors for measuring the load attached to the golf swing diagnostic machine that measure and display the load and center of gravity change of the subject during the swing. This is a head speed display device that is configured to estimate and display the speed of the club head at the time of impact without using any special sensors, and is used to judge the quality of the golf swing posture and improve it. The purpose of the present invention is to provide a head speed display device that will help the user to perform the following tasks.

[Means to solve the problem]

In order to solve the above problems, the head speed display device of the present invention includes a load measuring table that measures the load during the subject's swing using a load cell, and a head detector that detects the passing of the club head and detects the point of impact. A head speed display device, comprising a storage means in which a description of the correlation between the load measurement value at impact and the head speed is recorded in advance, and selects a description that meets a given condition from among the descriptions of the correlation, The present invention is characterized by comprising a calculation means for estimating the head speed using the description from the output of the load measuring table at the time of impact detected by the head detector, and a display device for displaying the estimated head speed value.

Further, the head speed display device of the second invention further includes a storage means in which a description of the correlation between the load increase value at impact and the head speed is recorded in advance, and a description that satisfies a given condition from among the descriptions of the correlation is provided. a calculation means for estimating the head speed using the description from the output of the load measuring table when the subject is at rest and the output of the load measuring table at the time of impact detected by the head detector; The present invention is characterized by comprising a display device for displaying estimated values.

Further, the head speed display device of the third invention further includes a storage means in which a description of the correlation between the division value obtained by dividing the load increase value at the time of impact by the load increase period and the head speed is recorded in advance, a calculation means for estimating the head speed from the output of the load measuring table at the time of impact detected by the head detector using the selected description; and a display device for displaying the estimated head speed value. It is characterized by having the following.

[For production]

According to the research conducted by the inventors of the present invention, it has been found that the speed of the club head at impact is not related to the maximum load during the test subject's swing, but to the load near the time of impact. It was found that there was an extremely high correlation between the load value measured by the load measuring table and the head speed. Moreover, this correlation is based on the type of club, i.e. the length of the club shaft,
Although the coefficients differ depending on factors such as the weight of the club head and the length of the subject's arms, it has been found that there is no difference in the basic relational expression, and that it is not significantly influenced by the subject's actual weight. The above relationships determined experimentally can be described in the form of a correlation equation or a correlation table.

In the head speed display device of the present invention, since the head detector is installed near the tee, when a test subject climbs onto the load measuring table and performs a test move, the moment the club head impacts the ball on the tee, the A detector detects the passage of the head and detects the point of impact. The load on the subject at this time is determined by summing the measurement output of each load cell installed on the load measurement table.

This calculation is easily performed by the calculation processing means of the calculation means.

The calculation means further includes a storage means in which a correlation formula or a correlation table describing the above-mentioned correlation is recorded, so that the calculation processing means can adapt the data such as club type etc. given separately from this storage means. The head speed is estimated by selecting and reading out a formula or table, and applying the load at impact determined by the method described above to this formula. The estimation result of the speed is displayed in an easy-to-understand manner on a two-dimensional display device such as a CRT, liquid crystal display, or plasma display, or a dedicated display device using, for example, a bar display using an LED. The display device may also be configured to provide an estimated value of head speed or flight distance by voice.

The present device displays the club head speed at impact for each attempt, allowing subjects to accurately and easily judge whether the swing is good or bad, making it easy to correct the swing and improve efficiency in practice. It is also extremely useful for making adjustments before playing.

Further, according to the head speed display device of the second invention, when the subject stands still on the load measuring table, the weight at rest is measured from the output of the load measuring table, and the head detector detects the impact. The amount of load increase is calculated by subtracting the body weight at rest from the load determined from the output of the load measuring table at the time of detection, and the correlation between the load increase value and head speed at the time of impact for each condition recorded in advance in the storage means. By selecting a description that meets the given conditions from among the descriptions and applying the load increase value to this description, the head speed can be estimated, and the estimated head speed value can be displayed.

According to the head speed display device of the third aspect of the invention, the body weight of the subject at rest is measured from the output of the load measuring table when the subject stands still on the load measuring table, and the head detector detects the impact. The amount of load increase is calculated by subtracting the body weight at rest from the load determined from the output of the load measuring table at the time of detection, and the amount of load increase is calculated based on the load increase period at the time of impact (when the load exceeds the body weight at rest). time). Then, from among the descriptions of the correlation between the division value and head speed at impact for each condition recorded in advance in the storage means, a description that meets the given condition is selected, and the head speed is estimated by applying the multiplication result to this description. The estimated head speed value can be displayed.

〔Effect of the invention〕

Since the club head speed display device of the present invention can estimate and display the speed of the club head using the load measuring mechanism and the impact detector, it can also be used when combined with a golf swing diagnostic device that measures and displays the center of gravity position. This is easy as there is no need to add additional sensors.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS The head speed indicator of the present invention will be described in detail below with reference to drawings showing embodiments. Figure 1 is part 1 of the claimed invention.
FIG. 2 is a plan view showing the arrangement relationship between the load measuring table and the head detector in the embodiment, and FIG. 2 is an elevational view thereof. Figure 3 is a drawing showing an example of a correspondence table between impact load and club head speed.
FIG. 4 is a diagram showing changes in the measured value of the load measuring table in the time domain, and FIG. 5 is a diagram showing an example of a correspondence table between the value obtained by dividing the load increase value by the load increase period and the head speed. Further, FIG. 6 shows an example of the structure of a head speed display device, and FIG. 7 shows its signal block diagram.

In this embodiment, a head detector (2) is disposed in front of the load measuring table (1). The load measuring table (1) has four load cells (12), (13). (14), (
A top plate (l1) supported at four corners by 15) is provided. Load cell output (Wl). (W2),
(W3) and (W4) are converted by the load converter (16) into digital load values that can be easily processed by mechanical calculation.

The head detector (2) is equipped with a tee stand (25) planted with artificial grass.
) is equipped with a light receiver (21A) on the front side across the path of the club head, and a corresponding light emitter (21B) on the other side to detect the passage of the club head and detect the impact. An impact detector (21) for detecting the moment and a reset button (23) are provided.

These emitters and receivers and the reset button are controlled by a control box (24). A tee can be erected at the pole set position, and various clubs can be used.

The test subject holds a club and takes a stance while standing on the load measuring table (1) at approximately the center of the top plate (1l). Load cells (12), (13) located at the four corners of the load measuring table (1)
, (14), and (15) have previously canceled out the load on the top plate (1l) by zero adjustment in the load converter (16), so the outputs (Wl), (W2), (
The total (WT) of W3) and (W4) is the weight of the subject sitting on the top plate. In addition, when the load cells are arranged in a triangular shape, there is an advantage that the number of load cells is small and furthermore, even if there is an imbalance in the supporting points, the influence on measurement errors is small, so assembly and adjustment is easy. There is a risk of instability if someone is on top of it.

The moment when the test subject makes an impact and makes an impact is automatically detected by an impact detector (2l) installed at the tee position by detecting the passing of the head or the moment when the ball disappears.

The load at this time is determined by the load cells (
12), (13), (14), and (15) and converts it into a load value.
/O interface (32), the calculation means (3
).

On the other hand, the calculation means (3) includes an internal storage device (33) as one of the components in addition to the I/O interface (32), the calculation processing means (3l), and the control console (34). A correspondence table between the load at impact and the head speed determined experimentally is stored here. Since the above measures differ depending on the club, a corresponding table is also prepared for each club. Figure 3 shows the driver (W1) and the 5-iron (
The corresponding curve for case I5) is shown together with an actual measurement example. The horizontal axis shows the load value in kg, and the vertical axis shows the head speed in m/s. In the case of a driver (solid line Wl in the figure), the head speed is approximately 34 m/s with a load of 60 kg, approximately 42 m/s with a load of 120 kg, and in the case of a 5 iron (
Broken line I5) indicates a head speed of approximately 29 when the load is 60 kg.
m/s, and with a load of 120 kg, it is about 35 m/s, and both graphs are slightly swollen downward, so they are very similar. The actual measured values indicated by crosses or squares in the figure are the results obtained by a plurality of test takers, and it can be seen that even when the test takers are different, the relationship between the load value and the head speed can be approximated by the same curve. In addition, since a more accurate correlation formula will be established if the difference in the weight of the subjects is corrected, it is recommended to use a value that corrects the load at impact based on the measured weight when the subject stands on the load measuring table (1). This will make it more reliable.

In this case, it is necessary to use these functions in the above-mentioned correspondence table, but it is also possible to approximately calculate it by correcting it from the relationship between the load measurement value and the head speed.

In the above case, it has been found that the head speed is not related to the maximum load during the swing, but is actually related to the load near the impact, and therefore the head speed is determined by the head detector (2) at the time of impact. It is necessary to specify the

By the way, the load converter (1
Figure 4 shows the changes in the output (WT) of 6) in time series. Here, the load increase value (h) is obtained by subtracting the measured value of the subject's body weight when standing on the load measuring table (1) from the load at the time of impact, and this load increase value (h) is calculated as the load increase period at the time of impact. It has also been experimentally found that the value divided by (1) has a high correlation with the head speed.

FIG. 5 shows the corresponding curve for the driver (Wl) together with an actual measurement example. The division result is plotted in kg/sec on the horizontal axis, and the head speed in m/s on the vertical axis. The actual measured values shown in squares are the results of multiple test takers. From this result, it can be seen that the measured values are arranged on a straight line expressed by a linear function. Therefore, the internal storage device (33) can also store a correspondence table between the division value and the head speed at the time of impact, which is determined experimentally.

The above correlation may be described using a mathematical formula or a numerical table. It is also possible to select parameters corresponding to each club and determine an appropriate equation without having to prepare a large number of correlation equations.

In this embodiment, an internal storage device (33) is provided to ensure speed of calculation, but an external storage device may also be added, and descriptions of correlations may be recorded and used here. It goes without saying that it is possible.

The arithmetic processing means (31) selects and pulls out a description of the correlation that matches the swing conditions separately given such as the type of club from the storage means (33),
By applying and calculating the load measurement value, the head speed at the time of impact is estimated. Head speed at the time of impact should directly reflect the flight distance of the ball if the club head hits the ball correctly, so it is a direct indicator of the quality of the swing.

The above estimated head speed at impact is I
The information is displayed in numerical or analog form on the display (4) via the /O interface (32). Display device (4)
may be part of a two-dimensional display device such as a CRT, liquid crystal display, or plasma display attached to the golf swing diagnostic device, or may be a dedicated display device using an LED bar display or numerical display, for example. There may be. In any case, it is preferable that the display device (4) is arranged so that the subject can read the display while standing on the table.

This display remains until the subject resets it, so the subject can look at it after the swing and judge whether it is good or bad. If the reset instruction signal is sent by providing a switch (23) at an appropriate position on the tee stand (25) and touching it with the club head, the test subject will not change his/her stance. It can be operated repeatedly, so it is convenient when trying out a skill repeatedly and comparing it.

The control console (34) is used for managing calculation programs, setting measurement parameters, and the like.

Needless to say, it can be used as is for left-handed subjects by arranging the head detector (2) in the opposite direction.

Furthermore, although numbers referring to drawings are added in the description of the claims, these are added for the purpose of aiding understanding, and do not limit the technical idea of the claimed invention. Needless to say.

[Brief explanation of drawings]

Fig. 1 is a plan view showing the arrangement relationship between the load measuring table and the head detector in one embodiment of the head speed indicator of the present invention, Fig. 2 is an elevational view of the same, and Fig. 3 shows the relationship between the load at impact and the head speed. Correspondence examples, Figure 4 is an example of changes in the measured value of the load measuring table in the time domain, Figure 5 is an example of the correspondence between the load increase value divided by the load increase period and the head speed, and Figure 6 is the head speed. An example of the structure of the display device, FIG. 7 shows its signal block diaphragm. (1)... Load measuring table, (2)... Head detector, (3)... Arithmetic device, (4)...
・・・Display device, (12)"・(15)...
Load cell, (21)...impact detector,
(h) Load increase value, <1> Load increase period.

Claims (1)

[Claims] 1. A head equipped with a load measuring table (1) that measures the load of the subject during his swing using a load cell, and a head detector (2) that detects the passage of the club head and detects the point of impact. The speed display device is equipped with a storage means (33) in which a description of the correlation between the load measurement value at the time of impact and the head speed is recorded in advance, and the device selects an appropriate description from among the descriptions of the correlation and uses the selected description. and the head detector (2)
) at the point of impact detected by the load measuring platform (1
) Calculation means (3) for estimating head speed from the output of
and a display device (4) that displays the estimated head speed value.
Head speed display device equipped with. 2. A head speed display device equipped with a load measuring table (1) that measures the load during the test subject's swing using a load cell, and a head detector (2) that detects the passing of the club head and detects the point of impact. , is provided with a storage means (33) in which a description of the correlation between the load increase value and the head speed at the time of impact is recorded in advance, and an appropriate description is selected from among the descriptions of the correlation, and the impact detected by the head detector (2) is selected. Calculating means for estimating the head speed using the selected description from a value obtained by correcting the output at the time by the output of the load measuring table (1) when the subject is stationary;
3) and a display device (
4) A head speed display device comprising: 3. A head speed display device equipped with a load measuring table (1) that measures the load during the test subject's swing using a load cell, and a head detector (2) that detects the passing of the club head and detects the point of impact. , a storage means (3
3), the head speed is determined from the output of the load measuring table (1) at the time of impact detected by the head detector (2) using the selected description by selecting an appropriate description from the correlation descriptions. A head speed display device comprising a calculation means (3) for estimating and a display device (4) for displaying the estimated head speed value.