JP2022515242A - Table tennis racket swing accuracy and replacement discrimination device - Google Patents

Abstract

The present invention repeatedly stores a table tennis racket including a handle for gripping and a striking portion connected to the handle to hit a ball, and acceleration information and angular velocity information installed on the handle and generated when the table tennis racket swings. The sensing sensor unit, the discrimination unit for determining the swing accuracy by calculating and comparing the swing locus of the table tennis racket based on the sensing information sensed through the sensing sensor unit, and the impact amount applied to the striking portion are calculated. It includes a replacement judgment unit that senses a change in the amount of impact and guides the judgment at the time of replacement with respect to the striking portion.

Description

The present invention relates to the swing accuracy of the table tennis racket and the exchange determination device, and more specifically, determines whether or not the swing is accurate through the swing trajectory analysis of the table tennis racket according to the technology, and accurately determines the replacement time of the table tennis racket. Regarding the swing accuracy of the table tennis racket and the exchange determination device that can be performed.

In general, table tennis is a competition in which a net is set up in the center of the table tennis table and a small and light ball is struck with a racket on the opponent's court to compete for a match. Precise control of swing movement and adjustment of swing force are very important competitions, and it is necessary to master and master the technique by continuously and repeatedly practicing the swing movement due to such characteristics. In addition, the natural conversion of forehand swing and backhand swing must be mastered and skilled by practicing continuously and repeatedly.

For example, the service and receive, which can be said to be the start of table tennis competition, can be effectively received only through continuous practice because the height, speed, and direction of the ball differ depending on the person who provides the service, and it can also be converted into an attack. can do.

Therefore, recently, various forms of practice devices have been developed to compensate for such problems, and as an example of the table tennis practice device, there is a "table tennis game robot" according to Korean Registered Patent No. 10-1114595. be.

The table tennis game robot disclosed in the above patent document includes a table tennis robot capable of launching a ball and a sensitive sheet sensor manufactured in a thin film form on a table tennis table on which a ball hit by a user collides. The prior art with the configuration is that the table tennis robot shoots the ball at the user, and the sensitive sheet sensor detects the landing point of the ball hit by the user with the racket, and the distance and angle of the ball fired by the table tennis robot, It is designed to control the direction.

However, the table tennis game robot re-launches the ball to the user so as to correspond to the ball hit by the user, but has a disadvantage that it is difficult to determine the swing state of the user and give feedback to the user.

An object of the present invention is that when an impact amount is generated at a preset point in a swing trajectory, it is possible to determine that the ball has been hit accurately and confirm the accuracy of the swing, and the impact amount at this time. The swing accuracy of the table tennis racket can accurately determine the replacement time of the rubber by continuously storing, for example, determining that the rubber bonded to the table tennis racket has been consumed when the impact amount value becomes small. And to provide a replacement discriminator.

The swing accuracy and exchange determination device for a table tennis racket according to the present invention is a table tennis racket including a handle for gripping and a striking portion connected to the handle to hit a ball, and a table tennis racket installed on the handle and generated when the table tennis racket swings. A sensing sensor unit that repeatedly stores acceleration information and angular velocity information, and a discrimination unit that calculates and compares the swing locus of the table tennis racket based on the sensing information sensed through the sensing sensor unit to determine swing accuracy. It is characterized by including a replacement determination unit that calculates and stores the amount of impact applied to the striking portion and senses a change in the impact amount to guide the determination of the replacement time point for the striking portion.

Here, the replacement determination unit includes a sensing unit that is installed in the striking portion and detects vibration generated by hitting a ball and calculates it as an impact amount.
A measuring unit provided with an imaging means for photographing the impacting portion while making a determination for the impacting portion replacement time point when the impact amount starts to decrease through the sensing unit when it is electrically connected to the sensing unit. And prepare.

The measuring unit photographs the striking portion through the photographing means, collects the pattern region portion formed in the striking portion, compares the pattern region portion with a preset reference pattern region portion, and compares the striking portion with the preset reference pattern region portion. To determine the point of exchange for.

Then, it is formed so as to be rested on the striking portion, and by reducing the frictional force of the striking portion, it is determined that the table tennis racket is selectively provided to move at the striking portion when the angle is changed. Provide means.

Further, the measuring unit photographs the angle between the striking portion and the ground at the time when the determining means leaves the striking portion through the photographing means, and exchanges the striking portion with respect to the preset reference exchange angle. Try to judge the point in time.

On the other hand, the discriminating unit includes a locus calculation unit that calculates the swing locus of the table tennis racket based on the sensing information of the sensing sensor unit.
Appropriateness for the swing of the table tennis racket by the hitting determination unit that determines the hitting point where the table tennis racket hits the ball in the swing locus calculated through the locus calculation unit and the hitting point position determined by the hitting determination unit. It is equipped with a swing analysis unit for determining and analyzing.

Here, the discriminating unit further includes a type discriminating unit that analyzes the swing locus pattern calculated by the locus calculating unit to discriminate the swing type of the table tennis racket.
The swing analysis unit receives standard swing locus data corresponding to the type of swing determined by the type discriminating unit from the memory, and compares the swing loci of the table tennis racket calculated through the locus calculation unit.

The discrimination unit further includes a memory for storing standard swing locus data different from each other depending on the type of swing of the table tennis racket.
The swing analysis unit determines the swing accuracy of the user by comparing the standard swing locus data stored in advance in the memory with the swing locus of the table tennis racket calculated through the locus calculation unit.

The locus calculation unit includes a locus tracking unit that calculates the movement locus of the table tennis racket based on the sensing information of the sensing sensor unit, and the table tennis that is calculated by the locus tracking unit based on the sensing information of the sensing sensor unit. Movement between the base point calculation unit that calculates the start point of the swing where the swing starts and the end point of the swing where the swing ends, and the start point and end point of the swing calculated by the base point calculation unit. It is provided with a swing locus determination unit that calculates the locus based on the swing locus for the table tennis racket.

Then, the sensing sensor unit senses the acceleration and the moving direction of the table tennis racket.
The base point calculation unit determines that the movement direction of the table tennis racket is changed by the movement trajectory calculated by the trajectory tracking unit, and the point where the acceleration of the table tennis racket is equal to or lower than the preset first acceleration is regarded as the start point of the swing. Then, the point where the acceleration of the table tennis racket is equal to or less than the preset second acceleration after the swing start point is determined as the swing end point.

The present invention provides in advance the expert swing data including swing acceleration and swing angle information, which is a technical reference, compares the expert swing data with the user's swing data, and converts them into points. By doing so, it is possible to effectively judge whether or not the swing is accurate by comparing the points.

Then, according to the present invention, when an impact amount is generated at a preset point in the swing locus, it can be determined that the ball has been hit accurately and the accuracy of the swing can be confirmed, and the impact amount at this time can be confirmed. Is continuously stored, and even if the impact amount value becomes small, it can be judged that the rubber bonded to the table tennis racket has been consumed.

Further, in the present invention, when it is determined that the rubber has been consumed, the pattern distribution due to wear is grasped by using the photographing means, and at the same time, when the test plate mounted on the table tennis racket slides, the table tennis racket and the ground It has the effect of measuring the angle and comparing it with the preset judgment data so that the rubber replacement time can be accurately judged.

The drawing which showed the swing accuracy of the table tennis racket and the exchange discriminating device according to the Example of this invention schematically. The block diagram which shows the swing accuracy of the table tennis racket and the structure of the exchange discriminating device according to the Example of this invention. The drawing which showed the swing accuracy of the table tennis racket according to the Example of this invention, and the exchange determination unit for exchange determination apparatus. The drawing for demonstrating the swing accuracy of the table tennis racket according to the Example of this invention, and one Example of the exchange time point determination with respect to the exchange determination apparatus. The drawing for demonstrating the swing accuracy of the table tennis racket according to the embodiment of this invention, and the other embodiment of the exchange time point determination with respect to the exchange determination device.

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

The advantages and features of the present invention, and methods for achieving these, may be clarified with reference to the examples described in detail with the accompanying drawings.

However, the present invention is not limited to the examples disclosed below, and can be embodied in various forms different from each other. The present embodiment is provided merely to complete the disclosure of the present invention and to fully inform a person having ordinary knowledge in the technical field to which the present invention belongs the scope of the invention. Is only defined by the scope of claims.

If it is determined that the publicly known technology related to the description of the present invention may obscure the gist of the present invention, detailed description thereof will be omitted.

FIG. 1 is a drawing schematically showing a table tennis racket swing accuracy and replacement discrimination device according to an embodiment of the present invention, and FIG. 2 is a drawing showing a table tennis racket swing accuracy and replacement discrimination device according to an embodiment of the present invention. It is a block diagram which shows the structure of.

Further, FIG. 3 is a drawing showing the swing accuracy of the table tennis racket according to the embodiment of the present invention and the exchange determination unit for the exchange determination device, and FIG. 4 shows the swing accuracy of the table tennis racket according to the embodiment of the present invention and the exchange determination unit. It is a drawing for demonstrating one embodiment of the exchange time point determination with respect to the exchange discriminating device, and FIG. 5 is a figure of FIG. It is a drawing for demonstrating.

As shown in FIG. 1, the swing accuracy and exchange determination device of the table tennis racket according to the present embodiment includes the table tennis racket 100, the sensing sensor unit 200, the determination unit 300, and the exchange determination unit 400.

The table tennis racket 100 includes a handle 110 for gripping and a batter 120 connected to the handle 110 to hit a ball.

That is, the table tennis racket 100 is formed by extending in a predetermined length in the front-rear direction so that the user can grasp it, and the striking portion 120 is a base plate 122 connected to the front end portion of the handle 110 and the base plate 122. It is provided with a hitting rubber 124 provided on the upper surface.

Here, the striking rubber 124 is preferably formed so as to cover the upper surface of the base plate 122, and is preferably formed of a rubber-like material having a predetermined elasticity. At this time, the striking rubber 124 has a very high surface viscosity. It is possible to freely demonstrate the high-class technology of table tennis such as drive or cut by allowing the user to give a high rotational force to the ball when hitting the ball with the striking part 120 by using a high material. can.

In this embodiment, the striking rubber 124 is provided on the upper surface of the base plate 122, but the structure is not limited to this, and the striking rubber 124 is provided on the upper and lower surfaces of the base plate 122 depending on the type of the table tennis racket 100. You may.

On the other hand, the sensing sensor unit 200 is installed inside the handle 110 of the table tennis racket 100, and senses the acceleration, the moving direction, or the position information of the table tennis racket 100.

Although not shown, the sensing sensor unit 200 is an acceleration sensor that can detect motion by calculating the increase / decrease ratio of velocity with respect to linear motion in a specific direction, and a table tennis racket that detects an azimuth angle using the earth's magnetic field. It is preferably composed of at least one of a geomagnetic sensor that senses 100 directions or a gyro sensor that can sense the direction by using the value of the angle at which an object rotates with respect to one axis as a numerical value.

Here, since the acceleration sensor, the geomagnetic sensor, and the gyro sensor as described above are the same as the accelerometer, the geomagnetic sensor, and the gyro sensor that are generally used conventionally, detailed description thereof will be omitted.

Further, the sensing sensor unit 200 may include a first communication module (not shown) for wirelessly transmitting information regarding the movement of the table tennis racket 100.

In this embodiment, the structure in which the sensing sensor unit 200 is installed at the rear end portion of the handle 110 is shown, but the sensing sensor unit 200 may be installed at the front end portion or the striking portion 120 of the handle 110.

On the other hand, the discrimination unit 300 includes a locus calculation unit 310 that calculates the swing locus of the table tennis racket 100 based on the sensing information of the sensing sensor unit 200, a memory 350 that stores standard swing locus data for each swing type of table tennis, and a locus. The type determination unit 340 that analyzes the pattern of the swing locus calculated by the calculation unit 310 to determine the swing type of the table tennis racket 100, and the hit that the table tennis racket 100 hits the ball with the swing locus calculated through the locus calculation unit 310. A swing analysis unit that determines the swing accuracy of the user by comparing the hit determination unit 320 that determines the point, the standard trajectory data stored in the memory 350, and the swing trajectory of the table tennis racket 100 calculated through the trajectory calculation unit 310. It is equipped with 330.

On the other hand, although not shown, the discrimination unit 300 can receive the sensing information of the sensor sensing unit transmitted through the first communication module (not shown) of the sensor sensing unit 200 (not shown). (Not shown) is further provided.

The locus calculation unit 310 includes a locus tracking unit 312, a base point calculation unit 314, and a swing locus determination unit 316.

The trajectory tracking unit 310 calculates the movement trajectory of the table tennis racket 100 based on the sensing information of the sensing sensor unit 200.

The locus tracking unit 310 calculates a movement locus in which the user moves the table tennis racket 100 based on the acceleration information, the movement direction information, or the position information of the table tennis racket 100 provided by the sensing sensor unit 200.

At this time, it is preferable that the locus tracking unit 310 calculates the movement locus of the table tennis racket 100 from the time when the user starts the exercise to the time when the exercise ends.

The base point calculation unit 314 calculates the start point of the swing at which the swing starts and the end point of the swing at which the swing ends in the movement trajectory of the table tennis racket 100 calculated by the trajectory tracking unit 310 based on the detection information of the detection sensor unit 200. do.

That is, when the user starts swinging the table tennis racket 100, the table tennis racket 100 is swung around in anticipation of the trajectory of the ball in the stopped standby posture. At this time, the acceleration of the table tennis racket 100 increases from the stopped state, and the direction suddenly changes depending on the trajectory of the ball. Therefore, the base point calculation unit 314 uses the movement trajectory calculated by the trajectory tracking unit 312 to obtain the table tennis racket 100. The point where the moving direction of the table tennis racket 100 changes and the acceleration of the table tennis racket 100 becomes equal to or less than the preset first acceleration is determined as the start point of the swing.

Here, the first acceleration is preferably 0 to 1 cm / s ² .

Further, the base point calculation unit 314 determines that the point of the movement locus where the acceleration of the table tennis racket 100 is equal to or less than the preset second acceleration after the start point of the swing is determined as the end point of the swing, and the user determines that the end point of the swing is the table tennis racket 100. When completing the swing, since it is after hitting the ball, the user takes a stopped standby posture and observes the opponent's hit ball.

Therefore, at the moment when the swing ends, the user's table tennis racket 100 stops, and the acceleration of the table tennis racket 100 drops sharply.

Therefore, the base point calculation unit 314 can determine the point where the acceleration of the table tennis racket 100 suddenly decreases to the second acceleration or less after the start point of the swing as the end point of the swing, and at this time, the second acceleration is 0-1 cm. It is preferably / s ² .

The swing locus determination unit 316 calculates the movement locus between the start point and the end point of the swing calculated by the base point calculation unit 314 as the swing locus of the table tennis racket 100.

The swing locus determination unit 316 provides the calculated swing locus data of the table tennis racket 100 to the type determination unit 340, the impact determination unit 320, and the swing analysis unit 330.

The memory 350 stores standard swing trajectory data for each type of table tennis swing, in other words, the memory 350 stores standard swing trajectory data for each type of swing such as drive, short, cut, and stroke. There is.

The type determination unit 340 receives the swing locus of the table tennis racket 100 from the locus calculation unit 310, analyzes the pattern of the swing locus, and determines the swing type of the table tennis racket 100.

The type determination unit 340 analyzes the total length, shape, traveling direction, and the like of the swing locus, and determines which swing of the drive, short, cut, and stroke the swing locus corresponds to.

The type discrimination unit 340 provides the swing analysis unit 330 with the type information of the discriminated swing.

The hitting determination unit 320 determines the hitting point where the table tennis racket 100 hits the ball based on the swing locus calculated through the locus calculation unit 310, and at this time, the user determines the hitting point where the ball hits the table tennis racket while the user is swinging the table tennis racket 100. If it collides with 100, the acceleration of the table tennis racket 100 is reduced by the ball. The time when the acceleration of the table tennis racket 100 decreases can be determined as the hitting point of the ball.

Therefore, the hitting determination unit 320 determines that the point where the acceleration of the table tennis racket 100 decreases in the swing locus calculated by the locus calculation unit 310 is the hitting point based on the sensing information provided by the sensing sensor unit 200.

The swing analysis unit 330 compares the standard locus data stored in the memory 350 with the swing locus of the table tennis racket 100 calculated through the locus calculation unit 310, and determines the swing accuracy of the user.

At this time, the swing analysis unit 330 has a standard swing corresponding to the swing type of the swing locus from the standard swing locus data stored in the memory 350 based on the swing type information of the swing locus provided by the type determination unit 340. The trajectory data is received, and the swing trajectory of the table tennis racket 100 calculated through the trajectory calculation unit 310 is compared.

Further, although not shown, the swing analysis unit 330 is a display unit such as a monitor so that the standard swing locus data and the comparison result of the swing locus of the table tennis racket 100 received from the locus calculation unit 310 can be displayed. Further provided (not shown).

The display unit may display the degree of coincidence of the swing locus of the locus calculation unit 310 with respect to the standard swing locus data as a numerical value, or may display the standard swing locus data and the swing locus of the locus calculation unit 310 so as to overlap each other.

On the other hand, the swing analysis unit 330 determines and analyzes the suitability of the swing of the table tennis racket 100 based on the position of the impact point determined from the impact determination unit 320 in the swing locus.

Here, the swing analysis unit 330 sets the range from the swing start point to the preset reference point in the swing locus calculated by the locus calculation unit 310 as the immature range, and uses it if the hitting point is located in the immature range. It is determined that the swing of the user is in an immature state, and if the hitting point exceeds the immature range, it is determined that the swing of the user is excellent, and this determination result is displayed through the display unit.

Here, the most preferable point where the table tennis racket 100 hits the ball on the swing locus is a point separated from the start point of the swing between 2/3 and 3/3 of the total length of the swing. This is because if the table tennis racket 100 hits the ball before the point separated by 2/3 of the total length of the swing from the start point of the swing on the swing trajectory, sufficient kinetic energy is generated by the swing of the table tennis racket 100. Since it is a previous point, only a relatively small force is transmitted to the ball. Therefore, the swing analysis unit 330 sets the reference to the swing locus at a position separated from the swing start point by an isolation distance corresponding to 65% to 70% of the total length of the swing locus calculated by the locus calculation unit 310. It is preferable to set a point.

On the other hand, although a computer is applied to the discrimination unit 300 in the illustrated example, the discriminant unit 300 is not limited to this, and an information processing device such as a notebook / pancon, a PDA, or a smartphone may be applied.

The operation for swing accuracy analysis of the table tennis racket according to the present embodiment configured as described above and the swing accuracy analysis in the exchange discriminating device will be described in detail as follows.

First, the user starts a table tennis competition or practice using the table tennis racket 100 in which the sensing sensor unit 200 is installed.

At this time, the locus tracking unit 312 of the locus calculation unit 310 calculates the movement locus of the table tennis racket 100, and the base point calculation unit 314 and the swing locus determination unit 316 swing based on the sensing information provided through the sensing sensor unit 200. The start point and the end point of the table tennis racket 100 are determined, and a large number of swing loci are calculated from the movement locus of the table tennis racket 100 with the start point and the end point of the swing as a reference.

At this time, the swing locus calculated through the locus calculation unit 310 is provided to the swing analysis unit 330, and the swing analysis unit 330 has standard swing locus data corresponding to the swing type of each swing locus determined through the type discrimination unit 340. Is received from the memory 350 and compared with each swing locus.

At this time, the swing analysis unit 330 displays the coincidence degree information of the swing locus of the locus calculation unit 310 with respect to the standard swing locus data and the graph information in which the standard swing locus data and the swing locus of the locus calculation unit 310 overlap each other (not shown). It can also be displayed in.

Further, the swing analysis unit 330 analyzes the swing state of the table tennis racket 100 based on the hit point information of the ball determined through the hit determination unit 320.

That is, the swing analysis unit 330 determines whether or not the hitting point at which the ball is hit in the entire swing is preferable, and outputs the judgment result through the display unit (not shown).

As described above, the swing accuracy and exchange discriminating device for the table tennis racket according to the present embodiment calculates the swing locus of the table tennis racket 100 through the sensing sensor unit 200 installed in the table tennis racket 100 to discriminate the swing state. Therefore, there is an advantage that the user can more easily learn the correct swing posture.

On the other hand, the swing accuracy and exchange determination device of the table tennis racket according to the present embodiment further includes the exchange determination unit 400.

The exchange determination unit 400 calculates and stores the amount of impact applied to the hitting portion 120 by the ball, and also senses the change in the impact amount to detect the hitting portion 120, more specifically, the hitting portion 120. It is possible to guide the judgment at the time of replacement for the rubber 124.

For this purpose, the replacement determination unit 400 includes a sensing unit 410 and a measuring unit 420.

First, the sensing unit 410 is installed in the hitting unit 120, senses the vibration generated by hitting the ball, and calculates it as an impact amount.

Preferably, the sensing unit 410 is composed of a vibration sensor and is installed between the boundary with the handle 110 to minimize the direct collision with the ball, while effectively calculating the amount of impact due to the vibration generated at the time of collision. can do.

The measuring unit 420 is electrically connected to the sensing unit 410 so that a determination regarding the replacement time of the striking rubber 124 is made at the time when the impact amount starts to decrease through the sensing unit 410.

Such a measuring unit 420 is provided with a photographing means 420a for photographing the striking rubber 124, and is provided separately from the discrimination unit 300 in the form of a smartphone, or when the discrimination unit 300 is a smartphone. It can be embodied in a form in which the photographing means 420a is built in together with the application.

Here, the measuring unit 420 photographs the striking rubber 124 through the photographing means 420a, collects the pattern region A formed on the striking rubber 124 as shown in FIG. 4, and obtains such a pattern region A. It is possible to determine the replacement time point for the striking rubber 124 in comparison with the preset reference pattern region portion.

That is, the striking rubber 124 is embodied in a form in which a honeycomb-shaped pattern region portion A is formed inside, and a rubber is additionally coated on the upper surface thereof. By using the table tennis racket 100 for a long period of time, such a pattern region portion A gradually appears on the surface of the table tennis racket 100 due to the collision between the ball and the hitting rubber 124, and such a pattern region portion A becomes the hitting rubber. If it seems to spread over a wide range to 124, it means that the life is long.

Therefore, if the amount of impact applied to the striking rubber 124 through the sensing unit 410 is kept constant and then becomes smaller, the measuring unit 420 may execute the corresponding application through the measuring unit 420 to replace the striking rubber 124. Try to judge whether or not. When the application is executed in this way, the operation of the shooting means 420a is activated, and thereby, if the surface of the hitting rubber 124 is photographed using the shooting means 420a, a pattern area is formed on the surface of the hitting rubber 124. The numerical value of how much the part A spreads with respect to the total area is displayed in% format.

As an example, when the pattern region portion A is displayed as being spread over a range of 40% or more with respect to the entire region of the striking rubber 124, the rubber additionally coated on the upper surface of the pattern region portion A is worn. , Judging that the frictional force due to it has been lost, interpreting that it is time to replace the striking rubber 12, informs the user of the contents in the form of vibration or the like, and accurately grasps the replacement time of the striking rubber 124. To be able to.

In addition to the above method, it is also possible to grasp the replacement time point of the hitting rubber 124 by using the determination means 422. The determination means 422 is formed so as to be settled on the striking rubber 124, and is provided so as to selectively move on the striking rubber 124 when the angle of the table tennis racket 100 is changed as the frictional force of the striking rubber 124 decreases.

In other words, as in the above-described embodiment, if the amount of impact applied to the striking rubber 124 through the sensing unit 410 is kept constant and then becomes smaller, the corresponding application is executed through the measuring unit 420 to replace the striking rubber 124. Try to decide whether or not to do it. When the application is executed in this way, the operation of the photographing means 420a is activated, and the angle θ between the table tennis racket 100 and the ground at the time when the determining means 422 slides and moves from the striking rubber 124 through the photographing means 420a is measured. By doing so, it is possible to accurately grasp the replacement time point for the striking rubber 124.

More specifically, the angle θ between the table tennis racket 100 and the ground at the time when the determination means 422 leaves the striking rubber 124 is photographed through the photographing means 420a, and this is compared with a preset reference exchange angle, for example, 45 degrees. When it is confirmed that the determination means 422 moves with the striking rubber 124 at the reference exchange angle set below, it is determined that the frictional force with respect to the striking rubber 124 has decreased, and the corresponding content is vibrated to the user. By notifying in such a form, it is possible to accurately grasp the replacement time point of the striking rubber 124.

As a result, the present invention can accurately determine the replacement time of the striking rubber 124 through the above-described embodiment, whereby the striking rubber 124 included in the table tennis racket 100 always maintains the best condition. To be able to.

The present invention is to store expert swing data including swing acceleration and swing angle information as a technical standard in advance, compare expert swing data with user swing data, convert them into points, and provide them. Therefore, it is possible to effectively judge the accuracy of the swing through the score comparison.

Then, according to the present invention, it is possible to determine that the ball has been accurately hit when an impact amount is generated at a preset point in the swing trajectory, and to confirm the accuracy of the swing, and the impact amount at this time can be determined. It has the effect that it can be judged that the rubber bonded to the table tennis racket has been consumed if it is continuously stored and the impact amount value becomes small.

Further, in the present invention, when it is determined that the rubber is consumed, the pattern distribution due to wear is grasped by using the photographing means, and at the same time, the angle between the table tennis racket and the ground when the test plate mounted on the table tennis racket slides. It has the effect of being able to accurately determine when to replace the rubber by measuring and comparing with the preset judgment data.

The present invention has been described above with reference to the examples shown in the drawings, but this is merely an example, and anyone with ordinary knowledge in the art will be able to make various modifications. It should be understood that it can be applied and that all or part of the embodiments described above can be selectively combined and configured. Therefore, the true technical protection scope of the present invention should be defined by the technical idea of the scope of claims.

100: Table tennis racket 110: Handle 120: Strike unit 122: Base plate 124: Impact rubber 200: Sensing sensor unit 300: Discrimination unit 310: Trajectory calculation unit 312: Trajectory tracking unit 314: Base point calculation unit 316: Swing locus determination unit 320: Impact discrimination unit 330: Swing analysis unit 340: Type discrimination unit 350: Memory 400: Exchange determination unit 410: Sensor unit 420: Measurement unit 420a: Imaging means 422: Judgment means A: Pattern area unit

Claims (10)

A table tennis racket including a handle for gripping and a hitting portion connected to the handle and hitting a ball,
A sensing sensor unit installed on the handle and repeatedly storing acceleration information and angular velocity information generated during the swing of the table tennis racket.
A discrimination unit that calculates and compares the swing locus of the table tennis racket based on the sensing information sensed through the sensing sensor unit to determine the swing accuracy.
The swing accuracy of the table tennis racket is characterized by including a replacement judgment unit that calculates and stores the amount of impact applied to the striking portion, senses a change in the impact amount, and guides the determination of the replacement time point for the striking portion. Degree and replacement discriminator. The replacement determination unit is
A sensing unit installed in the battering unit that senses vibration generated by hitting a ball and calculates it as an impact amount.
With a measuring unit provided with an imaging means for electrically connecting to the sensing unit, making a judgment on the replacement time of the striking portion at the time when the impact amount starts to decrease through the sensing unit, and photographing the striking portion. The swing accuracy and replacement determination device for a table tennis racket according to claim 1, further comprising. The measuring unit
By photographing the striking portion through the photographing means, the pattern region portion formed in the striking portion is collected, and the pattern region portion is compared with the preset reference pattern region portion to determine the replacement time point for the striking portion. The swing accuracy and replacement determination device for a table tennis racket according to claim 2, wherein the determination is made. The measuring unit
Judgment means provided so as to be settled on the striking portion and selectively move by the striking portion when the angle of the table tennis racket is changed by reducing the frictional force of the striking portion. 2. The table tennis racket swing accuracy and exchange determination device according to claim 2. The measuring unit
Through the photographing means, the angle between the striking portion and the ground at the time when the determining means leaves the striking portion is photographed, and the exchange time point with respect to the striking portion is determined by comparing with a preset reference exchange angle. The swing accuracy and replacement determination device for a table tennis racket according to claim 4. The discrimination unit is
A locus calculation unit that calculates the swing locus of the table tennis racket based on the sensing information of the sensing sensor unit, and
A hitting determination unit that determines a hitting point at which the table tennis racket hits the ball in the swing trajectory calculated through the trajectory calculating unit, and a hitting determination unit.
The swing accuracy and replacement of the table tennis racket according to claim 1, further comprising a swing analysis unit that determines and analyzes suitability for the swing of the table tennis racket based on the impact point position determined from the impact determination unit. Discriminating device. The discrimination unit is
Further provided with a type discriminating unit that analyzes the swing locus pattern calculated by the locus calculation unit and discriminates the swing type of the table tennis racket.
The swing analysis unit receives standard swing locus data corresponding to the type of swing determined by the type discriminating unit from the memory, and compares it with the swing locus of the table tennis racket calculated through the locus calculation unit. The swing accuracy and replacement determination device for a table tennis racket according to claim 6. The discrimination unit is
Further equipped with a memory for storing standard swing trajectory data different from each other depending on the type of swing of the table tennis racket.
The swing analysis unit is characterized in that the standard swing locus data stored in advance in the memory is compared with the swing locus of the table tennis racket calculated through the locus calculation unit to determine the swing accuracy of the user. The swing accuracy and replacement determination device for the table tennis racket according to claim 6. The locus calculation unit
A locus tracking unit that calculates the movement locus of the table tennis racket based on the sensing information of the sensing sensor unit, and
A base point calculation unit that calculates the start point of the swing where the swing starts and the end point of the swing where the swing ends in the movement trajectory of the table tennis racket calculated by the trajectory tracking unit based on the detection information of the detection sensor unit.
The eighth aspect of claim 8 is characterized by comprising a swing locus determination unit that calculates a movement locus between a swing start point and an end point calculated by the base point calculation unit based on a swing locus for the table tennis racket. Swing accuracy and replacement discrimination device for table tennis racket. The sensing sensor unit is
Detecting the acceleration and moving direction of the table tennis racket,
The base point calculation unit determines that the point at which the movement direction of the table tennis racket is changed in the movement trajectory calculated by the trajectory tracking unit and the acceleration of the table tennis racket becomes equal to or less than the preset first acceleration is defined as the start point of the swing. The swing accuracy of the table tennis racket according to claim 9, wherein the point where the acceleration of the table tennis racket is equal to or less than the preset second acceleration after the swing start point is determined as the end point of the swing. Replacement discriminator.

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