JPH04343867A - Impact detecting device - Google Patents

Abstract

PURPOSE:To detect the actual impact time by recognizing the passing time first detected by a passing time detecting means as an impact time and detecting the same after the speed higher than a predetermined threshold value is detected by a head speed detecting means. CONSTITUTION:An optical sensor 3 detects the passing of a club in a ball placing position. The passing speed of a club head is detected from the time difference between the club passing times individually detected by optical sensors 1, 2 and the mutual relative interval. In this case, if the threshold value of head speed detection is fixed to 10m/s, for example, even if the optical sensor 3 detects the passing of a club due to the waggling motion or the like, the waggling is not detected as an impact time by mistake. Since the time of passing of a club first detected by the optical sensor 3 is detected as an impact time after the head speed higher than a threshold value is detected, when the club is let down after the finish of the swing motion, it is not erroneously detected as an impact time.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used as a device for analyzing defects in golf swing motion of a test subject, and relates to a device for detecting impact during a swing motion.

0002

2. Description of the Related Art Reflecting the recent golf boom, various devices have been devised for the purpose of improving golf skills. One such system is a system that measures a subject's golf swing by detecting the state of the subject's weight shift during the golf swing.

[0003] Most of these devices use video TV or the like to visually observe the swing motion, but they detect the state of weight shift during the swing motion and use this detection result to monitor the swing motion. A device has been devised that can numerically analyze the state of a test subject's swing motion by displaying it along the time axis (Japanese Patent Application No. 2-29906
5, patent application No. 2-299066). The above-mentioned devices detect the state of the subject's weight shift during actual ball hitting, and some devices allow comparison of detection results based on multiple ball hitting results.

By the way, when using these devices, if it is clearly recognized to which point during the swing motion the time series data of the detected weight shift state corresponds,
It becomes easy to analyze the swing motion of the subject from the obtained data. For this reason, conventional swing motion analysis devices are equipped with an impact detection means for detecting the time of impact during the swing motion, and are incorporated into the time-series data, for example, to clearly recognize the time of impact during the swing motion. I'm letting you do it.

An example of a conventional impact detection device is shown in FIG. Here, it is assumed that the test subject actually hits a ball and performs a swing analysis. Detect the point in time when the is blown away.

[0006] This is the detection of the time when the club hits the ball (at the time of impact), but actually the time when the golf club crosses the optical axis of the optical sensor is detected. Therefore, since the time of impact can be detected regardless of the presence or absence of a ball, it is possible to detect the time of impact even when the subject is practicing swinging.

[0007] In this conventional example, the ball 31 is irradiated with the detection light from the lateral direction, but the system is not limited to this method. It is fine as long as it can be detected. Alternatively, it may be of a type in which an optical sensor is embedded in the lower part of the ball placement part, or a type in which a metal sensor is used to detect the passage of a club.

[0008]

[Problems to be Solved by the Invention] By the way, when performing a normal golf swing motion, "waggle" occurs at address.
In many cases, a preliminary operation called . This "waggle" refers to a movement in which the subject frequently moves the club near the ball position in order to time the start of the swing motion. For this reason, the above-mentioned impact detection means is activated by the waggle motion at the time of address, causing a problem in which the time of impact is erroneously detected.

[0009] Furthermore, the subject completed the swing motion (
The problem of erroneous detection at impact also occurs when the club is lowered near the ball position after the swing motion has reached its finish. Therefore, if data based on these false detections is incorporated, it will become impossible to accurately analyze the swing motion, and if it is incorporated into other swing motion analysis data, the data itself may become unusable. Become.

Furthermore, when importing data based on a series of swing motions, if the data from the start of the swing motion to the end of the swing motion is captured with the time of impact as a reference, if the above erroneous detection occurs, the actual swing motion may not be correct. The data inside cannot be imported, but only the data before the start of the swing motion or after the end of the swing motion can be captured. The present invention aims to solve the above-mentioned problems and provide a device that can accurately detect only the actual impact during a swing motion.

[0011]

[Means for Solving the Problems] To achieve the above object, the present invention provides an impact detection means for detecting the time of impact in a golf swing motion of a test subject, which detects the time when the club head passes the golf ball placement position. and a head speed detecting means for detecting the passing speed of the club head passing a position immediately before the golf ball placement position, and the head speed detecting means detects a speed faster than a predetermined threshold value. The invention is characterized in that the passing time first detected by the passing time detection means is recognized and detected as an impact point.

0012

[Operations] Since the present invention is constructed as described above, it exhibits the following functions. First, in a swing motion, the head speed of the club generally reaches its maximum before and after impact, and it goes without saying that this speed is much faster than the moving speed of the head in a waggle motion.

[0013] For this reason, a predetermined value is set as the threshold value, which is faster than the head speed of the club expected in a wagging motion or the like and slower than the head speed before and after impact in an actual swing motion. Since this head speed differs from subject to subject, it is preferable to set it according to the subject, or to make it variable and set it at the appropriate time.

[0014] If a value earlier than this threshold is detected, it can be clearly recognized that a swing motion is actually being made, so immediately after that (initially) the golf ball placement position is adjusted to the club head. If the time point at which the object passes is detected, the time at which the object passes detected at that time becomes the true time of impact.

[0015]Furthermore, since the first passage after a value earlier than the threshold value is detected is determined, the time of impact will not be erroneously detected in cases such as when the club is lowered after finishing the swing motion.

[0016] Here, at the time of impact of the swing motion,
Since this is the time when the club head hits the ball, by capturing the time when the club head passes the ball placement position, the time of impact during the swing motion can be detected regardless of the presence or absence of the ball. Therefore, the time of impact can be detected by detecting the time when the club head passes the golf ball placement position using the passing time detection means. This passage detection means is not particularly limited, and may be one using the conventional example described above.

Further, the mechanism of the head speed detection means is not particularly limited as long as it can detect the passing speed of the club head passing the position immediately in front of the golf ball placement position. Hereinafter, the present invention will be explained in more detail through Examples.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an impact detection means according to an embodiment of the present invention incorporated into a device for time-sequentially detecting the state of weight shift during a swing motion. In this figure, optical sensors 1 to 3 are placed in the swing motion direction on the tee mat 5.
are arranged side by side in order, and each optical sensor 1-3 detects the time point when the club passes.

Here, the optical sensor 3 detects the passage of the club at the ball placement position, and detects the club head from the time difference when the club passes, detected individually by the optical sensors 1 and 2, and the relative distance between them. Passing speed (head speed)
is detected. Then, the subject
When the user rides on R and performs a swing motion on the tee mat 5, the time of impact is detected together with the head speed of the club.

[0020]Here, the head speed during a general swing motion is 30 m/s or more, and the moving speed of the club head due to the waggle motion before the swing motion is considered to be 10 m/s or less, so the head speed detection is If the threshold value is set to, for example, 10 m/s, even if the optical sensor 3 detects the passing of the club during a waggle motion or the like before starting the swing motion, this passing time will not be erroneously detected as an impact time.

[0021] Furthermore, since the time when the optical sensor 3 first detects the passing of the club after the head speed exceeding the threshold is detected is detected as the time of impact, the club is lowered after the finish of the swing motion. Even if the optical sensor 3 detects the passing of the club in some cases, it will not erroneously detect this detection as the time of impact.

Furthermore, in this embodiment, two sensors, optical sensors 1 and 2, are used to detect the head speed, one of which is placed immediately in front of the ball placement position, and the other is placed at a predetermined distance from there. As a result, the head speed itself is not detected due to small movements of the club head due to the waggle motion, and this also prevents false detection due to the waggle motion or the like.

Next, in this embodiment, the state of weight shift during the swing motion is detected in time series, and the detected time of impact is included in the detected data of the test subject's swing motion. This will be explained using FIG. 2, which schematically shows an example in which the impact detection means of this embodiment is applied to a golf swing check system.

[0024] Here, the means for detecting the state of weight shift over time during the swing motion is not particularly limited, and is disclosed in the earlier application (Japanese Patent Application No. 2-299065,
-299066) or other methods may be used.

First, as mentioned above, the subject performs a swing motion on the floor reaction force meters 11L and 11R corresponding to the right and left legs. Start instruction voice (e.g. "Please start.")
) to start (prepare) the swing motion.

[0026]However, regardless of the instruction, the subject generally does not start the swinging motion immediately, but after performing a wagging motion or the like for several seconds, the subject generally starts the swinging motion.
This interval differs for each subject. Therefore, at the same time as the start instruction voice is issued, the acquisition of detection data from the left and right floor reaction force gauges 11L and 11R is started. Then, the data is continued to be taken in for several seconds after the swing motion is started and the time of impact is detected, and ends after the elapse of this time.

[0027] Here, since the actual swing movement is around 2 seconds before and after the time of impact, from the above-mentioned input data, the 2 seconds before and 1 second after the detected impact time are compared to the actual swing motion. The data is stored in the CPU 24 as data during the swing operation. At this time, the detected impact time is marked in the storage data and stored at the same time. Then, a center-of-gravity movement diagram or the like is created from this stored data and displayed on the CRT 25, printer 27, or the like.

Here, the CPU 24 can individually store detection data based on a plurality of swing movements,
The configuration is such that any data can be recalled from these stored data and displayed over the center of gravity movement diagram.

An example of this display method is shown in FIG. As shown in the figure, when a plurality of pieces of detection data are superimposed, in order to clearly compare these data, it is preferable to match the time of impact as a reference position and superimpose the data.

[0030] This is because the time of impact is the time when a change in weight shift becomes noticeable, and is also the time when the intended action of hitting the ball is actually performed during the swing motion. Furthermore, although the time from the start of the swing motion, or from the start to the top of the swing motion, varies depending on the individual subject, the time from the top to the finish, centering on the time of impact, is
It has been confirmed that there are not many individual differences.

For this reason, in order to clearly compare multiple pieces of detection data, the times of impact are matched and superimposed. However, if an erroneous detection occurs by the conventional impact detection mechanism, ), there was a problem in which mutual comparisons using superimposed comparison data could not be performed.

However, according to this embodiment, since the true time of impact is reliably detected by the above-mentioned impact detection means, when multiple pieces of data are displayed in a superimposed manner as shown in FIG. It also allows accurate comparisons to be made.

[0033] As is clear from the individual overlapping diagrams of the plurality of data, there is an advantage in that variations in each swing motion can be clearly determined by overlapping the data at the same time of impact. Note that the sampling data shown in this example is from an advanced user, and there is relatively little variation among each data.

[0034] Also, when comparing the data of another person, such as an expert, for example, when performing superimposition processing on each of these stored data, the comparison should be made with the impact times matched as described above. , the characteristics of the subject's swing motion can be determined.

[0035] Furthermore, it is also possible to perform superimposition processing such as taking the average value of multiple detection data of a subject, and when calculating such averaged data, it is possible to calculate the true value as described above. A clear average value can be obtained by overlapping and averaging the impact times of the test subjects with the same time, and the characteristics (habits, etc.) of the subject's swing movement can be determined more clearly from this average value data.

In this embodiment, the detection light is irradiated from the side to the ball placement position, but the system is not limited to this method. It is fine as long as it can be detected.

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 that these problems do not occur.

[0038]

As explained above, according to the present invention, when detecting the time of impact during a swing motion, it is possible to reliably detect the time of true impact.

[0039] Then, when comparing or combining detected data based on multiple swing movements based on the time of impact detected here, since the true time of impact can be matched and superimposed, the individual data can be It has the advantage of being able to make a clear comparison judgment, and also has the advantage of being able to measure accurate average values.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing an example in which an impact detection means according to an embodiment of the present invention is applied to a golf swing analysis system.

FIG. 2 is a block diagram showing the configuration of the embodiment.

FIG. 3 is an explanatory diagram showing an example of a center of gravity diagram in the same embodiment.

FIG. 4 is an explanatory diagram showing an example of a conventional impact detection device.

[Explanation of symbols]

1 to 3...Optical sensor 5...Tea mat 11L, 11R...floor reaction force meter,

Claims (1)

[Claims] Claim 1. An impact detection means for detecting the time of impact in a golf swing motion of a subject, comprising:
A passing time detection means for detecting the time point when the club head passes the golf ball mounting position; and a head speed detection means for detecting the passing speed of the club head passing the position immediately before the golf ball mounting position; An impact detection device characterized in that, after the head speed detection means detects a speed higher than a predetermined threshold, the passing time first detected by the passing time detection means is recognized and detected as an impact point.