JP5962504B2 - Tennis racket selection system and selection method - Google Patents

Description

  The present invention relates to a system for selecting an appropriate tennis racket for a player when purchasing a tennis racket, and a method for selecting a tennis racket using the system.

  There are many types of tennis rackets (manufacturers, product numbers), and it is not easy to select which of the many tennis rackets is suitable for the customer when purchasing. Patent Documents 1 to 3 describe a method and an apparatus for analyzing a tennis swing, but there is no disclosure about selecting a tennis racket suitable for a player according to the analysis result.

JP 2002-126147 A JP2012-130414 JP2012-130415A

  An object of the present invention is to provide a tennis racket selection system and a selection method capable of easily selecting a tennis racket suitable for a player.

The tennis racket selection system according to the present invention includes a specifying means for specifying a player's classification based on the behavior of a ball that has been hit by a player and / or the behavior of the tennis racket that has been hit, and the player's classification in association with the player's classification. a database recommended tennis racket for recommending the player is recorded, from said database, possess and output means for outputting the read recommended tennis racket corresponding to the classification specified in said specifying means, the player corresponding to the desired improvement information indicating the desire to store additional information to customize the tennis racket, based on the desired improvement information is shall be outputting said corresponding additional information.

  The behavior of the tennis racket is preferably a movement track and a swing speed of the tennis racket.

  According to the tennis racket selection system of the present invention, the player is classified based on the behavior of the ball tried by the player and / or the behavior of the tried tennis racket, and a recommended tennis racket suitable for the player belonging to this classification is provided. It is read from the database and output. For this reason, a tennis racket suitable for the player can be quickly selected from a large number of types of tennis rackets.

  In the present invention, additional information according to the player's desire for improvement can be provided, so that a tennis racket more suitable for the player can be easily selected.

It is a block diagram of the selection system of the tennis racket concerning an embodiment. It is a flowchart which shows operation | movement of the selection system of the tennis racket which concerns on embodiment. It is a schematic diagram which shows a swing type.

  Hereinafter, embodiments will be described with reference to the drawings.

FIG. 3 shows three typical examples of tennis player swing types. Player P ₁ of (a) is a type that hold a relatively flat tennis racket T, racket T in the impact zone, the trajectory is held so as to be slightly rising slope towards the front (ball launch direction) ing. The hit ball in this case tends to have a relatively small amount of spin.

Player P ₂ of (b) is a mid-drive type, and swing to raise rub the ball than (a). The trajectory of the racket T in the impact zone has a higher rising gradient than that in (a), but is lower than that in the next case (c). The amount of spin in this case tends to be greater than (a) but less than (c).

Player P ₃ of (c) is a high drive type, so as to raise rubbed more strongly the ball in the impact zone, and are swing while strongly list turn to return the face surface. In this case, the amount of spin tends to be very large.

  Which of these swing types a player's swing belongs to may be specified by actually shooting the swing and obtaining the movement trajectory of the tennis racket T based on the captured video or image. It is preferable that an acceleration sensor is attached and a movement track of the tennis racket is obtained and specified based on data measured by the acceleration sensor. Further, the ball behavior such as the spin amount of the hit ball and the initial velocity of the ball may be measured, and the swing type may be specified based on the measurement result.

  In this embodiment, an acceleration sensor is attached to the tennis racket, and based on the measured data, the player is divided into three types of swing types and a total of nine types divided into three stages of high, medium and small head speeds. Identify whether it falls under. Then, commercially available tennis rackets (plural) recommended for players belonging to the specified classification are read from the database and displayed.

  Based on the relationship between the player's classification and the tennis racket that the player has chosen to be preferred, ask a wide variety of players to try each tennis racket as to which of the above categories the commercially available tennis racket belongs to. The database is constructed by experimentally defining and registering in the database.

  As the swing when measuring the swing type or the head speed, the swing when a ball hit at a specified speed in a specified direction from a specified height is analyzed. As an acceleration sensor for performing the swing analysis, for example, a 3-axis or 9-axis acceleration sensor or a gyro sensor is preferably used. According to this acceleration sensor, not only the movement track of the tennis racket but also the head speed can be measured. Further, a radar ballistic analyzer that measures the behavior of the ball that the player has tried may be further used. According to this radar type analyzer, the flight distance, the fall angle, etc. are measured (calculated) in addition to the speed and spin amount and direction of the launched ball.

  FIG. 1 is a block diagram of a tennis racket selection system in which the radar ballistic analyzer and the acceleration sensor 7 are used. The player uses the tennis racket to which the acceleration sensor 7 is attached, and strikes the ball as described above. A signal from the radar 1 that tracks the test ball and a signal from the acceleration sensor 7 are input to the analysis device 2 and processed, and at least the spin amount, the head speed at impact, and the movement track of the tennis racket are calculated. Data from the analysis device 2 is input to the selection / output device 3. The selection / output device 3 is configured by a personal computer or a terminal with a portable communication function, and can receive data or an operation signal from input means 4 such as a keyboard and a touch panel, and can display information on a display screen 5 such as a liquid crystal display. Yes. In the memory of the selection / output device 3 (such as a personal computer), there are a number of commercially available tennis racket specifications (at least face size, mass, back width), and the brand name and model of the tennis racket suitable for the above-mentioned nine types of players. Is stored for each type, and a database is configured. The calculation unit of the selection / output device 3 specifies the player's swing type based on the measurement data from the analysis device, reads the product name and model of the tennis racket corresponding to the specified swing type from the database, and displays the display screen. To display.

  Specifically, the selection / output device 3 displays the spin amount, the head speed, and the movement trajectory of the tennis racket, and the operator of the selection / output device 3 performs the above-described operation based on the displayed movement trajectory of the tennis racket. Determine which of the three types is flat drive type, mid drive type, and high drive type. Then, the operator uses the input means 4 to input which type of the swing type the player is.

  Next, the selection / output device 3 specifies whether the swing speed input from the analysis device 2 corresponds to large, medium, or small. Specifically, the first threshold value and the second threshold value are stored in advance, and if it is equal to or lower than the first threshold value, the swing speed is low, and if it is between the first threshold value and the second threshold value, the swing speed is determined. If it is more than the second threshold, it is determined that the swing speed is high. The selection / output device 3 classifies players based on the three types of swings and the three stages of the swing speed.

  The calculation unit of the selection / output device 3 specifies which of the nine types described above is based on the specified swing type and swing speed. The product name and model of a suitable tennis racket stored in the database in association with the specified type are displayed on the display screen 5 as a recommended tennis racket. Then, the player will try again using the recommended tennis racket. As described above, the present system can quickly provide a tennis racket suitable for the player from a large number of types of tennis rackets based on the behavior (movement trajectory and swing speed) of the tennis racket.

  In the above description, since the swing type is classified into three types and the head speed is classified into three stages, a total of nine classifications (3 × 3 = 9) are generated, but the high drive type (FIG. 3 (c) )) Is limited to players with a high or medium head speed, and there are few players with a low head speed among high-drive type players.

  By the way, in general, a player with a fast swing speed prefers a tennis racket whose tennis racket has a face size of 100 square inches or less and a tennis racket with a spine width of 26 mm or less (tennis racket is easy to handle). , Prefers a racket with a larger face size and a spine width of 26 mm or more (the ball flies even with a light swing).

  For this reason, in the present invention, the recommended tennis racket is customized according to the result of the trial hitting with the recommended tennis racket, the player's preference or feeling, the measurement result of the radar ballistic analyzer, the swing improvement desire, etc. Additional information may be further provided. Examples of the swing improvement desire include a desire to increase the spin rate and a desire to increase the head speed. The above-described database stores additional information in association with a swing improvement request, and an operator who has heard the improvement request from the player after the trial hit of the recommended tennis racket inputs it to the selection / output device 3. As a result, the additional information (customization information) is read and displayed on the display screen. Further, the additional information may not be stored in the database described above, and may be stored in a memory different from the database.

  For example, for players who want to increase the amount of spin, in order to relatively increase the ratio of the grip mass to the total mass of the tennis racket, the grip cover can be attached to and detached from the grip, As the body, a plurality of types having the same shape but different masses are prepared, and can be dealt with by adjusting the mass by exchanging with a grip covering body having a different mass.

  When it is desired to increase the head speed, a grommet having a mass larger than that of a normal grommet is recommended, or a mass member (weight material) that can be detached from the string (gut) is recommended.

  FIG. 2 is a flowchart showing the series of tennis racket selection operations described above. A personal computer (this personal computer is installed in, for example, a tennis shop) is started to start this selection program, and the player takes a test shot to capture analysis data. Next, the players are classified based on the spin amount and head speed data of the player, and a tennis racket suitable for the player is read from the database. After that, if there is an input of the player's own desired specifications (preferences and improvement points), further narrowing down is performed based on the input, and the result is displayed on the screen.

  Tables 1, 2, and 3 schematically show data structures indicating tennis rackets for each classification registered in the database. Table 1 shows the brand name, model, face size, mass, and spine width of a tennis racket suitable for a flat drive type player with a spin rate of around 1000 rpm (for example, less than 1500 rpm) by head speed. Table 2 shows the brand name, model, face size, mass, and back width of a tennis racket suitable for a mid-drive type player with a spin rate of around 1800 rpm (for example, 1500 to 2000 rpm) by head speed. Table 3 shows the trade names, types, face sizes, masses and back widths of tennis rackets suitable for high-drive players with a spin rate of over 2000 rpm by head speed. The unit of the face size in Tables 1 to 3 is square inch.

  In the present invention, after the recommended tennis racket is selected based on the behavior of the head of the tennis racket, the tennis racket may be subjected to mass adjustment or balance adjustment to adjust the face mass ratio or grip mass ratio of the tennis racket. In order to adjust the face mass, it is possible to employ a means for making the grommet attached to the face have a different mass or attaching or removing a mass adding material (weight) to / from the string (gut).

  In the above description, each characteristic of the player's swing type and tennis racket is classified into three stages, but any of them may be two stages or four or more stages. However, about 3 to 4 steps are preferable.

  In the above description, the player is asked to improve the swing after trying the recommended tennis racket, and the additional information is output by inputting it to the selection / output device 3, but the invention is not limited to this and the test is made. It may be possible to output the recommended tennis racket and the additional information at the same time by listening to the player's desire to improve the swing beforehand and inputting it to the selection / output device 3. That is, it is only necessary to output the recommended tennis racket and the additional information, and the timing for outputting the additional information is not limited.

  In the above description, the operator who operates the selection / output device 3 recognizes the swing type and specifies the swing type via the input means. However, the present invention is not limited to this, and the operator is not involved. Alternatively, the selection / output device 3 may specify the swing type. For example, the impact point of the ball in the movement track of the tennis racket is calculated from the data of the acceleration sensor, and the angle between the tangent line of the impact point and the horizontal line in the movement track of the tennis racket is θ. Also, a minimum curvature radius point indicating the minimum curvature radius (in the direction of jumping out of the ball) in the movement track of the tennis racket is calculated, and the curvature radius is set to r. The swing type may be specified according to Table 4 based on θ and r.

  In the above embodiment, the players are classified based on the behavior of the tennis racket. However, the present invention is not limited to this, and as described above, the players are classified based only on the ball behavior based on the data of the radar ballistic analyzer. May be. Further, the players may be classified based on data from both the radar ballistic analyzer and the acceleration sensor. Specifically, instead of the head speed stored in the above-described database, the spin amount and initial speed of the ball are stored, the recommended tennis racket is stored in association with them, and the recommended tennis racket is output. It may be.

1 Radar 2 Analysis device 3 Selection / output device 7 Acceleration sensor

Claims (3)

A specific means for identifying the classification of the player based on the behavior of the ball struck by the player and / or the behavior of the tennis racket struck,
A database in which recommended tennis rackets are recorded to be recommended to the player in association with the classification of the player;
From the database, it possesses and output means for outputting the read recommended tennis racket corresponding to the identified at a particular unit classification,
Storing additional information for customizing the tennis racket in response to the desired improvement information indicating the player's desire,
The choice on the basis of the improvement information, the corresponding tennis racket selection system that outputs the additional information. Oite to claim 1, the behavior of the tennis racket, a tennis racket of a selection system which is a moving track and swing speed of the tennis racket. A tennis racket selection method for selecting a tennis racket using the tennis racket selection system according to claim 1 or 2 .

Images