JP6650019B1 - Golf ball recommendation device, golf ball recommendation method, and golf ball recommendation system - Google Patents

Abstract

A golf ball recommendation device capable of more accurately recommending a golf ball to a golfer to improve a flight distance when a driver is used is provided. A golf ball recommendation device includes: an acquisition unit configured to acquire a driver's head speed by a golfer and a maximum trajectory height of a golf ball hit by the driver; and a driver for each of a plurality of golf balls prepared in advance. An information storage unit that stores first information indicating a driver's head speed and a maximum trajectory height of the golf ball, in which a flight distance of the golf ball is maximized when the golf ball is hit with the acquisition unit; A recommendation unit that recommends a golf ball suitable for a golfer from among the plurality of golf balls based on the acquired head speed and maximum trajectory height and the first information about each of the plurality of golf balls. [Selection diagram] FIG.

Description

  The present disclosure relates to a technique for recommending a golf ball suitable for a golfer.

  The golfer selects a golf ball suitable for himself, for example, by referring to catalog information or actually performing a test hit. However, it is difficult to accurately determine whether a golf ball is really suitable for oneself.

  Japanese Patent Laying-Open No. 2002-315860 (Patent Document 1) discloses a method of selecting a golf ball. A golf ball selection method includes a step of obtaining a head speed value and a hit ball data value when a golfer hits a golf ball with a golf club, a step of obtaining ball type selection data, a head speed value and a hit ball data value. And selecting a ball suitable for the golfer based on the ball type selection data.

JP-A-2002-315860

  As a criterion for a golfer to select a golf ball, a flight distance is given. In Patent Literature 1, a ball of a type suitable for a golfer is selected so that the backspin amount of the hit ball approaches the optimum backspin amount corresponding to the head speed value. However, since the parameters related to the flight distance include the initial speed of the hit ball and the launch angle in addition to the backspin amount, from the viewpoint of improving the flight distance of the golf ball, the technique of Patent Document 1 does not include There seems to be room for improvement.

  An object of an aspect of the present disclosure is to provide a golf ball recommendation device, a golf ball recommendation method, and a golf ball recommendation system capable of more accurately recommending a golf ball that improves the flight distance when a driver is used to a golfer. It is to be.

  A golf ball recommendation device according to an embodiment, a head speed of a driver by a golfer, an acquisition unit that acquires a maximum trajectory height of a golf ball hit by the driver, and for each of a plurality of golf balls prepared in advance, An information storage unit that stores first information indicating a driver's head speed and a maximum trajectory height of the golf ball, wherein a flight distance of the golf ball is maximized when the golf ball is hit with the driver; And a recommendation unit that recommends a golf ball suitable for a golfer from among the plurality of golf balls based on the head speed and the maximum trajectory height acquired by the first method and the first information about each of the plurality of golf balls.

  Preferably, the acquisition unit is configured to receive an input of acceleration information and angular velocity information detected by a driver or a sensor attached to a shaft of another golf club, an information input unit, and based on the acceleration information and angular velocity information, A posture calculation unit that calculates the driver's posture information, a head speed calculation unit that calculates the driver's head speed at impact based on the acceleration information and the angular velocity information, and the driver's specification information, the calculated posture information, and the head speed And a trajectory calculation unit that calculates the maximum trajectory height of the golf ball hit by the driver based on the trajectory.

  Preferably, the posture information includes an attack angle indicating an angle of a direction of a swing trajectory with respect to the ground at the time of impact, and a shaft lean angle indicating an angle of the shaft with respect to a virtual plane perpendicular to the ground.

  Preferably, when the sensor is attached to a shaft of another golf club, the posture calculation unit calculates posture information of another golf club based on the acceleration information and the angular velocity information, and outputs the second posture to the calculated posture information. The head speed calculation unit calculates the head speed of another golf club based on the acceleration information and the angular velocity information, and calculates the second relation between the calculated head speed and the calculated head speed. Apply the formula to calculate the driver's head speed.

  Preferably, the driver's specification information includes the driver's club length and loft angle.

  Preferably, the acquisition unit receives the driver's head speed measured by the trajectory measuring device and the maximum trajectory height of the golf ball hit by the driver from the trajectory measuring device.

  Preferably, the recommendation unit displays a screen for recommending a golf ball suitable for a golfer from among the plurality of golf balls on a display. The screen includes a graph showing first information about each of the plurality of golf balls, and second information based on the head speed and the maximum trajectory height acquired by the acquisition unit. The recommendation unit recommends a golf ball suitable for a golfer from among a plurality of golf balls based on the positional relationship between each piece of the first information and the second information in the graph.

  Preferably, the graph is a graph in which the head speed of the driver is the first axis and the maximum trajectory height of the golf ball is the second axis.

  Preferably, the graph is a graph showing the maximum trajectory height of the golf ball corresponding to the head speed acquired by the acquisition unit.

  According to another embodiment, a computer-implemented golf ball recommendation method is provided. The golf ball recommending method includes obtaining a driver's head speed by the golfer and a maximum trajectory height of a predetermined golf ball hit by the driver. The computer calculates, for each of the plurality of golf balls prepared in advance, the head speed of the driver and the maximum trajectory height of the golf ball such that the flight distance of the golf ball when the driver hits the golf ball is maximized. Is stored. The golf ball recommendation method includes a step of recommending a golf ball suitable for a golfer from a plurality of golf balls based on the acquired head speed and maximum trajectory height and specific information about each of the plurality of golf balls. In addition.

  A golf ball recommendation system according to yet another embodiment includes a sensor device mounted on a shaft of a golfer driver or other golf club, and a golf ball recommendation device for recommending a golf ball suitable for a golfer. The golf ball recommendation device is configured such that, for each of a plurality of golf balls prepared in advance, the flight distance of the golf ball when the driver hits the golf ball is maximized. An information storage unit for storing specific information indicating a trajectory height, an information input unit for receiving input of acceleration information and angular velocity information detected by the sensor device, and a driver's posture at impact based on the acceleration information and angular velocity information A posture calculation unit that calculates information, a swing information calculation unit that calculates the driver's head speed at impact based on acceleration information and angular velocity information, and a driver's specification information, based on the calculated posture information and head speed , Maximum trajectory of a golf ball hit by a driver A golf ball suitable for a golfer is recommended from among a plurality of golf balls based on a trajectory calculation unit that calculates the height, a calculated head speed and a maximum trajectory height, and specific information about each of the plurality of golf balls. Recommendations to include.

  According to the present disclosure, a golf ball that improves the flight distance when a driver is used can be more accurately recommended to a golfer.

It is a figure for explaining the whole ball recommendation system composition. It is a figure showing appearance of a sensor device. It is a block diagram which shows the hardware constitutions of a ball recommendation apparatus. FIG. 3 is a block diagram illustrating a hardware configuration of the sensor device. FIG. 3 is a diagram for describing a local coordinate system and a global coordinate system. It is a flowchart for demonstrating the operation | movement outline | summary of a ball recommendation system. It is a figure for explaining a lie angle, an attack angle, a shaft lean angle, a face angle, and a swing path (incident angle). FIG. 4 is a diagram illustrating a relationship between a shaft lean angle and an attack angle between different clubs. FIG. 3 is a diagram for explaining a stillness detection method. It is a figure showing an example of a top screen. It is a figure showing an example of a measurement screen. It is a figure showing an example of a confirmation screen of a selected iron. It is a figure showing an example of a selection screen of a golf ball. It is a figure showing the evaluation result of a plurality of golf balls. It is a figure showing a simulation result of a plurality of golf balls. It is a figure which shows the other example of the confirmation screen of the selected iron. It is a figure showing other examples of a selection screen of a golf ball. FIG. 14 is a diagram showing still another graph displayed on the golf ball selection screen. It is a functional block diagram of a ball recommendation device. It is a functional block diagram of a ball recommendation device according to a modification.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same components are denoted by the same reference numerals. Their names and functions are the same. Therefore, detailed description thereof will not be repeated.

<System configuration>
(overall structure)
FIG. 1 is a diagram for explaining the overall configuration of the ball recommendation system. With reference to FIG. 1, the ball recommendation system 1000 analyzes a swing when the golfer hits the ball 54 and presents information indicating a golf ball suitable for the golfer. Specifically, the ball recommendation system 1000 includes the ball recommendation device 10 and the sensor device 20.

  The golf club 50 includes a shaft 52, a head provided at one end of the shaft 52, and a grip provided at the other end of the shaft 52. The golf club 50 may be any golf club, such as one prepared by the golfer himself or one prepared by another person. Note that the ball 54 may be any golf ball such as one prepared by the golfer himself or one prepared by another person.

  The ball recommendation device 10 is configured by a smartphone. However, the ball recommendation device 10 can be realized as any device regardless of the type. For example, the ball recommendation device 10 may be a device such as a laptop PC (personal computer), a tablet terminal, or a desktop PC.

  The ball recommendation device 10 communicates with the sensor device 20 using wireless communication such as Bluetooth (registered trademark), wireless LAN (Local Area Network), and infrared communication. Note that the ball recommendation device 10 may be configured to be able to communicate with the sensor device 20 using wired communication such as USB (Universal Serial Bus).

  FIG. 2 is a diagram illustrating an appearance of the sensor device 20. Specifically, FIG. 2 is an enlarged view of the sensor device 20 in FIG. The sensor device 20 is mounted on the shaft 52 such that the center of gravity of the sensor device 20 is located at a position, for example, about 12 inches to 15 inches from the upper end of the grip. The golf club 50 is balanced in weight, for example, at 14 inches from the end of the grip, and attaching a weight or the like to this portion does not significantly affect the weight balance of the golf club 50 as a whole. For this reason, by mounting the sensor device 20 at the above-described position, the characteristics of the golf club 50 are prevented from significantly changing before and after the sensor device 20 is mounted.

  The sensor device 20 includes an acceleration sensor, an angular velocity sensor, and a distortion sensor. The sensor device 20 transmits sensor data detected by each sensor, a calculation result based on the sensor data, and the like to the ball recommendation device 10. The ball recommendation device 10 receives various information from the sensor device 20 and executes various processes such as golfer swing analysis.

(Hardware configuration)
FIG. 3 is a block diagram showing a hardware configuration of the ball recommending device. Referring to FIG. 3, ball recommending apparatus 10 includes, as main components, processor 102, memory 104, touch panel 106, button 108, display 110, wireless communication unit 112, communication antenna 113, memory An interface (I / F) 114, a speaker 116, a microphone 118, and a communication interface (I / F) 120 are included. The recording medium 115 is an external storage medium.

  The processor 102 is typically an arithmetic processing unit such as a CPU (Central Processing Unit) or an MPU (Multi Processing Unit). The processor 102 controls the operation of each unit of the ball recommending device 10 by reading and executing the program stored in the memory 104. More specifically, the processor 102 implements each of the processes (steps) of the ball recommending device 10 described below by executing the program.

  The memory 104 is realized by a RAM (Random Access Memory), a ROM (Read-Only Memory), a flash memory, or the like. The memory 104 stores a program executed by the processor 102, data used by the processor 102, and the like.

  The touch panel 106 is provided on the display 110 having a function as a display unit, and may be of any type such as a resistive type and a capacitive type. The button 108 is arranged on the surface of the ball recommending device 10, receives an instruction from a user, and inputs the instruction to the processor 102.

  The wireless communication unit 112 connects to a mobile communication network via a communication antenna 113 to transmit and receive signals for wireless communication. Thereby, the ball recommendation device 10 can communicate with a predetermined external device via a mobile communication network such as LTE (Long Term Evolution).

  The memory interface (I / F) 114 reads data from an external recording medium 115. That is, the processor 102 reads data stored in the external recording medium 115 via the memory interface 114 and stores the data in the memory 104. The processor 102 reads data from the memory 104 and stores the data on an external recording medium 115 via the memory interface 114.

  Examples of the recording medium 115 include a CD (Compact Disc), a DVD (Digital Versatile Disk), a BD (Blu-ray (registered trademark) Disc), a USB (Universal Serial Bus) memory, a memory card, an FD (Flexible Disk), and a hard disk. And a medium for storing a program in a nonvolatile manner.

  The speaker 116 outputs sound based on a command from the processor 102. The microphone 118 accepts an utterance to the ball recommendation device 10.

  The communication interface (I / F) 120 is, for example, a communication interface for transmitting and receiving data between the ball recommending device 10 and the sensor device 20, and is realized by an adapter, a connector, or the like. The communication method is, for example, wireless communication using Bluetooth (registered trademark), a wireless LAN, or wired communication using USB.

  FIG. 4 is a block diagram illustrating a hardware configuration of the sensor device 20. Referring to FIG. 4, sensor device 20 includes, as main components, processor 202 for executing various processes, memory 204 for storing programs executed by processor 202, data, and the like, and acceleration sensor 206. , An angular velocity sensor 208, a communication interface (I / F) 212 for communicating with the ball recommendation device 10, a storage battery 214 for supplying power to various components of the sensor device 20, an LED (light emitting diode) 216, including.

  The acceleration sensor 206 detects accelerations in three orthogonal directions (hereinafter, also referred to as “acceleration information”). The angular velocity sensor 208 detects angular velocities around three axes orthogonal to each other (hereinafter, also referred to as “angular velocity information”).

  FIG. 5 is a diagram illustrating a local coordinate system and a global coordinate system. Referring to FIG. 5, the x-axis in the sensor coordinate system (local coordinate system) is set in the longitudinal direction of shaft 52, and the y-axis and the z-axis are set arbitrarily. In the absolute coordinate system (global coordinate system), the Z axis is set in the vertical direction, the Y axis is set in the golfer's swing direction, and the X axis is set in the vertical direction of the Y axis and the Z axis.

  Referring to FIG. 4 again, strain sensor 210 detects each amount of strain of shaft 52 in the hitting direction and the toe-down direction. Specifically, the strain sensor 210 includes two strain gauges (strain gauges for hitting direction) and strain gauges (strain gauges for toe-down) mounted on the shaft 52.

<System operation overview>
FIG. 6 is a flowchart for explaining an outline of the operation of the ball recommendation system 1000. Here, as shown in FIG. 1, it is assumed that a golfer hits a ball 54 placed on the ground with a golf club 50. Here, the golf club 50 on which the golfer swings is, for example, a 7-iron. The golf club 50 may be another iron such as a 6-iron or a wood such as a driver. It is assumed that the ball recommendation device 10 and the sensor device 20 can communicate with each other.

  Referring to FIG. 6, sensor device 20 attached to shaft 52 of golf club 50 detects acceleration information and angular velocity information in a time series (step S100). Specifically, the sensor device 20 detects acceleration information and angular velocity information in a sensor coordinate system (local coordinate system) every sampling period (for example, 1 ms). The sensor device 20 transmits the detected acceleration information and angular velocity information to the ball recommendation device 10 (Step S110).

  The ball recommendation device 10 calculates the head speed and the posture information of the golf club 50 during the swing period based on the acceleration information and the angular velocity information acquired from the sensor device 20 (Step S120). Specifically, the ball recommendation device 10 calculates the attitude angle of the head of the golf club 50 at the time of impact (that is, at the time of hitting a ball). The posture angle includes a lie angle, an attack angle, a shaft lean angle, and a face angle (more specifically, a relative face angle described later) at the time of impact. In the specification of the present application, "at the time of impact" means a point in time at the same time as the impact or a predetermined time (for example, about 1/1000 second) before the impact time (that is, immediately before the impact).

  For example, the shaft lean angle may be calculated using data of 1/1000 second before, and the attack angle may be calculated using data of a period from 2/1000 second to 1/1000 second before. Alternatively, the shaft lean angle and the attack angle at the time of impact may be obtained by obtaining a regression curve using data in a period from 5/1000 seconds to 1/1000 seconds ago.

  FIG. 7 is a diagram for explaining a lie angle, an attack angle, a shaft lean angle, a face angle, and a swing path (incident angle). In FIG. 7, a coordinate system in which one axis on the ground (for example, a horizontal plane) is a Bx axis, the other axis on the ground perpendicular to the Bx axis is a By axis, and a direction perpendicular to the Bx axis and the By axis is a Bz axis. Is defined. The direction (-Bz direction) when viewed from a direction perpendicular to the ground is referred to as plan view. The Bx axis is defined as a target line direction. The target line direction is, for example, a target direction of a hit ball in plan view. Specifically, FIG. 7A is a diagram illustrating a lie angle at the time of impact. FIG. 7B is a diagram illustrating an attack angle and a shaft lean angle at the time of impact. FIG. 7C is a diagram showing a face angle and a swing path at the time of impact.

  Referring to FIG. 7A, the lie angle at the time of impact is defined as an angle θ1 of the shaft 52 (specifically, the shaft centerline) of the golf club 50 with respect to the ground (BxBy plane in the figure). .

  Referring to FIG. 7B, the attack angle at the time of impact is the time of impact at the time of contact with the swing trajectory of the head of golf club 50 projected on a virtual vertical plane (BxBz plane in the figure) perpendicular to the ground. Is defined as an angle θ2 between the tangent direction (swing line direction) of the target and the target line direction projected on the virtual vertical plane. In other words, the attack angle θ2 at the time of impact is the angle of the direction of the swing trajectory with respect to the ground at the time of impact.

  In the present embodiment, when the inclination of the swing line is a negative value (as shown in FIG. 7B), the attack angle θ2 is a negative value, and when the inclination of the swing line is a positive value, the attack angle is θ2 is a positive value. Specifically, in the case of a down blow in which the head enters the ball obliquely downward, the attack angle θ2 <0 °, and in the case of a level blow in which the head enters the ball horizontally, the attack angle θ2 = 0 °, and in the case of an upper blow in which the head enters the ball obliquely upward, the attack angle θ2> 0 °.

  Referring to FIG. 7B, the shaft lean angle at the time of impact is defined as the angle θ3 of the shaft 52 with respect to the virtual plane J1 perpendicular to the target line direction. In other words, the shaft lean angle θ3 at impact is the angle of the shaft 52 with respect to the virtual plane J1 perpendicular to the ground at impact. In the present embodiment, when the inclination of the shaft center line is a positive value (the case shown in FIG. 7B), the shaft lean angle θ3 is a negative value, and when the inclination of the shaft center line is a negative value, Is a positive value of the shaft lean angle θ3.

  Referring to FIG. 7C, the face angle at the time of impact is defined as an angle θ4 of the face surface of golf club 50 with respect to virtual surface J2 orthogonal to the target line direction. In the present embodiment, when the inclination of the face surface is a positive value (as shown in FIG. 7C), the face angle θ4 is a positive value, and when the inclination of the face surface is a negative value, the face angle is θ4 is a negative value.

  The swing path (incident angle) at the time of impact is defined as an angle θ5 between the swing line direction and the target line direction. In the present embodiment, when the inclination in the swing line direction is a positive value (as shown in FIG. 7C), the swing path θ5 is a negative value, and when the inclination in the swing line direction is a negative value, The swing path θ5 has a positive value.

  The face angle θ4 represents the inclination of the face surface with respect to the direction of the target line whose direction is fixed irrespective of the direction of incidence (swing line direction) of the head at the hitting point. On the other hand, the relative face angle (hereinafter, also referred to as “relative face angle”) representing the inclination of the face surface with respect to the swing line direction is an angle obtained by subtracting the swing path θ5 from the face angle θ4. Note that the relative face angle is also called a face-to-pass angle.

  Referring again to FIG. 6, based on the posture information and the head speed calculated in step S <b> 120, ball recommendation device 10 determines the posture of the driver when assuming that golfer has hit ball 54 with the driver. The information and the head speed are calculated (step S130).

  FIG. 8 is a diagram showing a relationship between a shaft lean angle and an attack angle between different clubs. Referring to FIG. 8, in step S120, it is assumed that the shaft lean angle and the attack angle when hitting ball 54 with golf club 50 (7-iron) are −3.0 ° and −1.0 °, respectively. . In this case, using a predetermined relational expression for each posture angle, the shaft lean angle is 6.0 ° and the attack angle is 2.0 ° when it is assumed that the ball 54 is hit with a driver (1st wood). Is calculated. The predetermined relational expression for each attitude angle is defined according to the driver's specification information (for example, club length, etc.) owned by the golfer.

  Similarly, it is assumed that the head speed when hitting the ball 54 with a 7-iron is calculated to be 38 m / s in step S120. In this case, using a predetermined relational expression for the head speed, the head speed when the driver hits the ball 54 is calculated to be 45 m / s. The predetermined relational expression for the head speed is defined according to the specification information of the driver owned by the golfer.

  Referring again to FIG. 6, the ball recommendation device 10 determines the maximum trajectory of the ball 54 hit by the driver based on the specification information of the driver owned by the golfer, the posture information calculated in step S130, and the head speed. The height is calculated (step S140).

  The maximum trajectory height is determined by the initial conditions of the hit ball. The main initial conditions of the hit ball are a ball initial speed, a launch angle, and a back spin. The predicted maximum trajectory height is calculated by inputting the ball initial velocity, launch angle, and back spin into a three-dimensional ballistic simulation function (ballistic equation). The three-dimensional ballistic equation is created by a combination of actual measurement and simulation.

  The ball initial speed is calculated by inputting various kinds of information to a predetermined ball initial speed prediction function. The various information includes driver's specification information (for example, club length, club mass, center of gravity depth, lateral moment of inertia, vertical moment of inertia, restitution coefficient, slip coefficient), and head speed at impact (that is, step). It includes the head speed calculated in S130, the attack angle at impact (that is, the attack angle calculated in step S130), and the loft angle at impact. The driver's specification information is stored in the memory 104 of the ball recommendation device 10 in advance.

  The loft angle at impact is calculated based on the loft angle of the driver (original loft angle) and the shaft lean angle at impact (that is, the shaft lean angle calculated in step S130). The ball initial speed prediction function is created by simulation.

  The launch angle is calculated by inputting the above various information to a predetermined launch angle prediction function. The launch angle prediction function is created by simulation.

  The backspin is calculated by inputting the above various information to a predetermined backspin prediction function. The backspin prediction function is created by simulation.

  The ball recommending device 10 receives an instruction from the user via the touch panel 106 and displays a screen for recommending a golf ball suitable for a golfer (step S150).

<Details of each process>
Hereinafter, details of each process executed by the ball recommendation system 1000 will be described.

(Stationary detection)
Here, a method of detecting a stationary state immediately before a swing will be described. When a golfer swings a golf club, the procedure is generally performed as follows. Specifically, the golfer grasps the golf club, takes an address posture, performs a swing operation, and hits a golf ball.

  The ball recommendation device 10 calculates swing analysis information (for example, posture information, head speed, and the like) in time series based on sensor data (for example, acceleration information and angular velocity information) acquired from the sensor device 20. For example, if the swing preparation (for example, during the waggle operation) is set as the swing start time, integration errors and the like may be accumulated and appropriate swing analysis information may not be obtained. , Swing start point) must be accurately detected.

  FIG. 9 is a diagram for explaining the stillness detection method. The horizontal axis in FIG. 9 indicates time T (s), and the vertical axis indicates angular velocities (deg / s) and composite angular velocities around three axes (sensor coordinate system) orthogonal to each other.

  The graph shown in FIG. 9 shows angular velocity information when the golfer swings the golf club 50 and hits the ball 54. The ball recommendation device 10 calculates a time t1 at which the composite angular velocity W becomes less than the reference threshold Th (for example, 20 deg / s) by going back from a time that is a predetermined time (for example, 0.5 seconds) before the impact time. I do.

angular velocity omega _x around the _x-axis, when an angular velocity omega _z around the angular velocity omega _y, z-axis around the y-axis, the synthetic velocity W is expressed by the following equation (1).

  Next, the impact time will be described. At the time of impact, since the signal of the acceleration sensor 206 of the sensor device 20 makes a transient response due to the impact of the ball, the acceleration changes abruptly. Therefore, the ball recommendation device 10 calculates, as the impact time, a time at which the amount of change in the combined acceleration AC per unit time becomes equal to or greater than a threshold (for example, 500).

acceleration _a x in the x-axis direction, the acceleration _a y in the y-axis direction, when the acceleration _{a z} in the z axis direction, the resultant acceleration AC is expressed by the following equation (2).

  The ball recommendation device 10 starts at time t2, which is a time Ta (for example, 0.2 seconds) before the calculated time t1, and ends at time T3, which is a time Tb (for example, -0.1 seconds) before the time t1. Is calculated as a period in which the golfer is stationary (stationary period).

(Calculation of attitude angle)
The ball recommendation device 10 calculates attitude information of the sensor device 20 based on the acceleration information and the angular velocity information. Here, the direction cosine matrix Rq, which is the attitude information of the sensor device 20, is represented by the following equation (3).

  As shown in FIG. 5, the x-axis in the sensor coordinate system (local coordinate system) is set in the longitudinal direction of the shaft 52. Therefore, the attitude angle of the golf club 50 can be calculated using the attitude information of the sensor device 20 (that is, the direction cosine matrix Rq). Specifically, using each component of the direction cosine matrix Rq, the lie angle A_LIE, the shaft lean angle A_SL, and the face angle A_FA of the golf club 50 are respectively represented by the following equations (4), (5), and ( It is represented as 6).

  The ball recommendation device 10 (processor 102) averages the time-series acceleration information (three-axis acceleration) during the stationary period Tc, and based on the averaged acceleration information, indicates the initial attitude of the sensor device 20. The direction cosine matrix Rq0 is calculated. The processor 102 calculates initial values (ie, initial attitude angles) of the lie angle A_LIE, the shaft lean angle A_SL, and the face angle A_FA using the direction cosine matrix Rq0 and the above-described equations (4) to (6). The processor 102 sets the time t3 in FIG. 9 as the swing start time.

  The processor 102 calculates a direction cosine matrix Rq in a time series during the swing period from the swing start time to the impact time. The direction cosine matrix Rq is calculated in a time series according to the following flow.

  The acceleration information in the sensor coordinate system is converted into acceleration information (acceleration vector) in the global coordinate system using the direction cosine matrix Rq. Subsequently, a vector r (sensor coordinate system) from the sensor device 20 to the center of the head of the golf club 50 is converted to a global coordinate system using the direction cosine matrix Rq.

  Next, a rotation unit vector u of the sensor coordinate system and a rotation angle α per unit are calculated based on the angular velocities around the three axes. The rotation unit vector u of the sensor coordinate system is converted to the global coordinate system using the direction cosine matrix Rq, and the rotation unit vector ug and the rotation angle α converted to the global coordinate system are used to calculate the angular velocity vector ωg of the global coordinate system. Is calculated.

  Next, a transformation matrix R is obtained using the Rodrigues' rotation formula for the rotation unit vector ug. Then, a direction cosine matrix Rq1 obtained by rotating the direction cosine matrix Rq using the transformation matrix R is calculated. The above-described processing is repeated using the direction cosine matrix Rq1. Thereby, the direction cosine matrix Rq is calculated in a time series.

On the other hand, the processor 102 calculates the speed information (speed vector V) of the sensor device 20 in the global coordinate system by time-integrating the acceleration information (acceleration vector) in the global coordinate system. The processor 102 calculates a head speed vector Vh based on the speed vector V in the global coordinate system, the angular speed vector ωg, and the vector r from the sensor device 20 to the head center. X component of the head velocity vector Vh, Y component and Z component _{Vh x,} Vh y, When Vh _z, head speed Vhs is expressed by the following equation (7).

  Using the components of the velocity vector V, the attack angle A_AT and the swing path SWP of the golf club 50 are represented by the following equations (8) and (9), respectively.

  Then, the lie angle Lc, the shaft lean angle SLc, and the face angle FAc at the time of impact are calculated based on the direction cosine matrix Rqi at the time of impact and Expressions (4) and (5). Attack angle ATc and swing path SWc at impact are calculated based on velocity vector V at impact and equations (8) and (9). The relative face angle Frc at the time of impact is equivalent to a value obtained by subtracting the swing path SWc from the face angle FAc.

(fitting)
Here, a flow until a golf ball suitable for a golfer is fitted will be described. In the following description, it is assumed that the user of the ball recommendation device 10 is a fitter. The golf club 50 is assumed to be a 7-iron.

  The fitter selects an icon displayed on the display 110 and gives an instruction to start an application for swing analysis. Upon receiving the activation instruction, the ball recommendation device 10 displays a login screen and accepts input of a predetermined user ID and password. When the login authentication is successful, the ball recommendation device 10 displays a top screen 1200.

  FIG. 10 is a diagram illustrating an example of the top screen. Referring to FIG. 10, top screen 1200 includes a button 1202 for receiving an input of a measured value of wood, a button 1204 for receiving an input of a measured value of iron, and a button 1206 for displaying a past measurement history. In the present embodiment, a case where button 1204 is selected will be described.

  Upon receiving the selection of the button 1204, the ball recommendation device 10 establishes communication with the sensor device 20. Typically, the ball recommendation device 10 and the sensor device 20 are paired and connected. When the pairing connection is completed, the ball recommendation device 10 displays an input screen for various information regarding the golfer. The ball recommendation device 10 receives information such as the golfer's name, age, gender, e-mail address, height, dominant hand, average score, average number of rounds, and fitter's name via the touch panel 106 on the input screen. When the fitter selects a predetermined button on the input screen, a measurement screen is displayed.

  FIG. 11 is a diagram illustrating an example of the measurement screen. Referring to FIG. 11, a measurement screen 1300 includes a result area 1302 in which the measurement result is displayed, a start button 1304 for starting the measurement, a button 1306 for canceling the measurement, and a recommendation screen for the wood shaft. A transition button 1308 for transitioning and a transition button 1310 for transitioning to a recommendation screen of the iron shaft are included.

  Upon receiving the start button 1304, the ball recommendation device 10 notifies the golfer of a message such as "Please stand still" or "Please shot". In accordance with the message, the golfer uses the golf club 50 to which the sensor device 20 is attached, takes an address posture, performs a swing operation, and shoots a golf ball.

  The ball recommendation device 10 performs a swing analysis process based on various information received from the sensor device 20, and displays the analysis result as a measurement result. Specifically, the result area 1302 includes “head speed” at the time of impact, “swing tempo” indicating the maximum amount of bending during a swing, “forward warp angle” at the time of impact, and “toe down at the time of impact”. Amount, Bend coefficient at impact, Lie angle at impact, Shaft lean angle at impact, Attack angle at impact, and Relative face angle at impact Is displayed. The head speed, lie angle, shaft lean angle, attack angle, and relative face angle are calculated using the above-described method. Note that the relative face angle is simply displayed as “face angle” for ease of explanation to the customer.

  The measured values of the swing tempo, the forward warp angle, the toe-down amount, and the bending coefficient are calculated by the sensor device 20 using the strain sensor 210. The calculation method of the swing tempo, the forward warpage angle, and the toe-down amount is disclosed in, for example, Japanese Patent Application Laid-Open No. 2010-187749. A method of calculating a bending coefficient is disclosed in Japanese Patent Application Laid-Open No. 2010-187749 as a method of calculating an assumed bending point value.

  FIG. 11 shows a scene in which the golfer has performed the analysis of the first swing motion and displayed the respective measurement results. Each time the golfer makes a swing, the measurement result is added. The average value of each measurement result is also displayed. When the golfer's swing ends, the fitter selects the transition button 1310.

  Based on the measurement results shown in FIG. 11, an iron shaft suitable for a golfer is recommended on an iron shaft recommendation screen (not shown), and an iron head suitable for a golfer is recommended on an iron head recommendation screen (not shown). The golfer selects the recommended iron shaft and iron head on a predetermined selection screen. Further, the golfer selects a grip on the grip selection screen. Then, an iron confirmation screen shown in FIG. 12 is displayed according to the instruction of the fitter.

  FIG. 12 is a diagram illustrating an example of a confirmation screen of the selected iron. Referring to FIG. 12, confirmation screen 1450 includes an area 1454 displaying the selected iron model, count, shaft, and grip, an area 1456 displaying the selected golf ball, and a golf ball selection screen. Button 1458 for displaying, button 1460 for returning to the top screen, button 1462 for returning to the previous screen, transition button 1464 for returning to the selection screen of iron, and transition for switching to the selection screen of wood , And a completion button 1468.

  Referring to FIG. 12, on the confirmation screen 1450, the golf ball has not been selected, so that the area 1456 displays the ball name in gray scale. Specifically, a ball name (that is, ball A2) recommended by the ball recommendation device 10 is shown according to a recommendation method described later. When the fitter selects the button 1458, a golf ball selection screen is displayed.

  FIG. 13 is a diagram illustrating an example of a golf ball selection screen. Typically, upon receiving the selection of button 1458, ball recommendation apparatus 10 pops up selection screen 1530. Referring to FIG. 13, selection screen 1530 includes a region 1532 indicating a type of golf ball recommended for a golfer, a region 1534 indicating a golf ball recommended for a golfer, and a selection for selecting a golf ball. Region 1536.

  Specifically, the region 1532 indicates whether each of the plurality of balls A1 to A3 prepared in advance is a ball to which spin is hardly applied (small spin amount) or a ball to which spin is easily applied (high spin amount). And the information indicating whether the hit feeling is soft or hard is displayed. For example, the ball A2 is a golf ball of a type in which spin is relatively easily applied and the hit feeling is soft.

  In the area 1534, a graph 30 for recommending a golf ball suitable for a golfer based on the head speed and the maximum trajectory height is shown. The graph 30 is a graph in which the horizontal axis represents the driver's head speed, which is the first index relating to the flight distance of the golf ball, and the vertical axis, the maximum trajectory height of the golf ball which is the second index relating to the flight distance.

  As a result of extensive studies by the present inventors, it has been found that the relationship between the driver's head speed and the maximum trajectory height of a golf ball hit by the driver greatly affects the flight distance of the golf ball. Then, according to three types of head speeds and three types of trajectory height settings, the golf robot was made to test hit the balls A1 to A3, and the flight distances of the balls A1 to A3 were measured using a trajectory measuring device. The suitability of the balls A1 to A3 was evaluated based on the actual measurement results of the flight distance.

  FIG. 14 is a diagram showing evaluation results of a plurality of golf balls. Referring to FIG. 14, the head speed is set to one of three types of SLOW (for example, 38 m / s), STANDARD (for example, 43 m / s), and FAST (for example, 47 m / s). The maximum trajectory height is set to one of three types, HIGH, MID, and LOW.

  In FIG. 14, for example, when the golf robot makes a test hit of each of the balls A1 to A3 with the setting of the head speed “SLOW” and the maximum trajectory height “HIGH”, the ball A2 among the three balls A1 to A3 fly the most. This indicates that the distance was large. As another example, when the golf robot makes a test hit of each of the balls A1 to A3 with the setting of the head speed “FAST” and the maximum trajectory height “MID”, the ball A1 has the longest flight distance. .

  According to the evaluation result of FIG. 14, when the head speed is from “SLOW” to “STANDARD” and the maximum trajectory height is from “MID” to “HIGH”, the flight distance of the three balls A1 to A3 is maximized. It is suggested that the golf ball that runs (has the longest flight distance) is the ball A2. In addition, when the head speed is from “SLOW” to “STANDARD” and the maximum trajectory height is from “LOW” to “MID”, it is suggested that the golf ball with the longest flight distance is the ball A3. When the head speed is “FAST” and the maximum trajectory height is “MID”, it is suggested that the golf ball that maximizes the flight distance is the ball A1.

  Subsequent to the above evaluation results, the inventor of the present application performed a trajectory simulation for each of the balls A1 to A3 using various parameters measured when tens of thousands of golfers had hit the golf ball in the past. Then, based on the results of the trajectory simulation, for each combination of “head speed and maximum trajectory height”, the ball having the maximum flight distance from the three balls A1 to A3 was specified and plotted. The result is shown in FIG.

  FIG. 15 is a diagram illustrating simulation results of a plurality of golf balls. Referring to FIG. 15, the plot points indicating the coordinates (head speed, maximum trajectory height) at which ball A1 of three balls A1 to A3 has the maximum flight distance are concentrated in area Ea1. The plot points indicating the coordinates at which the ball A2 has the maximum flight distance are concentrated in the area Ea2, and the plot points indicating the coordinates at which the ball A3 has the maximum flight distance are clustered in the area Ea3.

  The region Xa1 is a circle having a predetermined radius centered on the average value of all coordinates at which the ball A1 has the maximum flight distance. The area Xa2 is a circle having a predetermined radius centered on the average value of all coordinates at which the ball A2 has the maximum flight distance. The area Xa3 is a circle having a predetermined radius centered on the average value of all coordinates at which the ball A3 has the maximum flight distance.

  According to the above simulation results, it is suggested that the golf ball that maximizes the flight distance is the ball A1 in the region where the head speed is high and the maximum trajectory height is the middle trajectory (that is, the region Ea1). In a region where the maximum trajectory height is large (that is, the region Ea2), it is suggested that the golf ball that maximizes the flight distance is the ball A2. In a region where the head speed is relatively low and the maximum trajectory height is relatively low (that is, the region Ea3), it is suggested that the golf ball that maximizes the flight distance is the ball A3.

  Therefore, the simulation result of FIG. 15 shows almost the same tendency as the evaluation result of FIG. 14, and is considered to be valid.

  Referring to FIG. 13 again, regions Xa1 to Xa3 corresponding to balls A1 to A3 are drawn on graph 30 based on the simulation results of FIG. Specifically, in the area Xa1, when the balls A1 to A3 are hit with a driver, the flight distance of the ball A1 is maximized (for example, the flight distance of the ball A1 is smaller than the flight distance of the remaining balls A2 and A3). Is larger), the head speed and the maximum trajectory height (combination). The same applies to the regions Xa2 and Xa3.

  Therefore, of the three balls A1 to A3, the ball A1 is the ball that has the longest flight distance for golfers who have a high driver's head speed and tend to hit a shot from a low trajectory to an intermediate trajectory. The ball A2 is a ball that has a relatively high head speed of a driver and has the longest flight distance for golfers who tend to hit high trajectory shots. The ball A3 is a ball having the longest flight distance for a golfer who has a relatively low driver's head speed and tends to hit a shot from a low trajectory to an intermediate trajectory.

  The circle area 1541 in the graph 30 is drawn based on the calculation result of the head speed and the maximum trajectory height of the driver by the golfer. Specifically, the ball recommendation device 10 analyzes the swing when the golfer hits the ball 54 with the golf club 50 (here, the 7-iron) based on various information received from the sensor device 20, The head speed at impact and the maximum trajectory height of the ball 54 are calculated.

  The ball recommendation device 10 applies a predetermined relational expression to the calculated head speed and the maximum trajectory height, and assuming that the golfer has hit the ball 54 with the driver, the head speed of the driver and the maximum value of the ball 54. Calculate the trajectory height. The ball recommendation device 10 displays a circular area 1541 on the graph 30 based on the calculated head speed and maximum trajectory height.

  The circular area 1541 (hatched portion in the graph 30) is centered on a point formed by the calculated head speed (for example, 45.2 m / s) and the calculated maximum trajectory height (for example, 33.9yard). Is a circle having a predetermined radius. The circle area 1541 is information indicating a golf ball suitable for a golfer.

  The regions Xa1 to Xa3 are regions indicating the head speed and the maximum trajectory height (combination) where the flight distance of the balls A1 to A3 is maximized. Therefore, it can be said that the ball corresponding to the region closest to the circular region 1541 among the regions Xa1 to Xa3 is most suitable for the golfer from the viewpoint of increasing the flight distance. More specifically, in graph 30, among the center points of regions Xa1 to Xa3, ball A2 corresponding to region Xa2 having the center point closest to the center point of circular region 1541 is a golf ball most suitable for a golfer. Become. Note that the radius of each of the regions Xa1 to Xa3 and the circular region 1541 is arbitrarily set for convenience of display, and is not considered when determining a recommended golf ball.

  The ball recommendation device 10 determines that the golf ball recommended to the golfer is the ball A2, and highlights only the ball A2 in the selection area 1536 with a thick line. Accordingly, it is understood that the golf ball recommended by the ball recommendation device 10 is the ball A2. If the golfer agrees to select ball A2, the fitter presses button 1546 to close golf ball selection screen 1530. If the golfer does not agree to select ball A2, the fitter selects another ball and presses button 1546 to close golf ball selection screen 1530. When the selection screen 1530 is closed, a confirmation screen shown in FIG. 16 is displayed. In the example of FIG. 13, the button corresponding to the ball A1 is checked in the selection area 1536, so that the ball A1 is selected.

  FIG. 16 is a diagram showing another example of the confirmation screen of the selected iron. As shown in FIG. 16, in the area 1456 of the confirmation screen 1450, information indicating that “ball A1” has been selected as the ball recommended by the fitter is displayed. This indicates that the ball A1 is finally selected as a result of the consultation between the fitter and the golfer. Specifically, when the fitter selects the ball A1 and presses the button 1546 to close the golf ball selection screen 1530, the confirmation screen shown in FIG. 16 is displayed.

  The graph for recommending a golf ball suitable for a golfer is not limited to the graph 30 in FIG. 13, but may be another graph.

  FIG. 17 is a diagram showing another example of the golf ball selection screen. Referring to FIG. 17, region 1534A includes a graph 30A for recommending a golf ball suitable for a golfer. The graph 30A is divided into regions Ya1 to Ya3 respectively corresponding to the balls A1 to A3 based on the simulation result of FIG. The area Ya1 reflects the head speed and the maximum trajectory height (combination) in which when the balls A1 to A3 are hit with a driver, the flight distance of the ball A1 becomes larger than the flight distances of the remaining balls A2 and A3. Area. The same applies to the regions Ya2 and Ya3.

  In the graph 30A, the direction in which the maximum trajectory height is high and the direction in which the maximum trajectory height is low are referred to as upward and downward, respectively, and the direction in which the head speed is fast and low are referred to as right and left, respectively. In this case, the area Ya1 is an area defined below the curve 601 and to the right of the curve 602. The area Ya2 is an area defined above the curve 601 and above the curve 602. The region Ya3 is a region defined below the curve 602.

  The circle area 1541 in the graph 30A is the same as the circle area 1541 in FIG. 13, and shows the calculation result of the golfer's head speed and maximum trajectory height. For example, it indicates that a ball corresponding to a region including the center of the circular region 1541 among the regions Ya1 to Ya3 is a golf ball most suitable for a golfer. More specifically, the circular region 1541 is included in the region Ya1 and the region Ya2, but the center of the circular region 1541 is included in the region Ya2. Therefore, the ball A2 corresponding to the region Ya2 is a golf ball most suitable for a golfer.

  FIG. 18 is a diagram showing still another graph displayed on the golf ball selection screen. Referring to FIG. 18, unlike graphs 30 and 30A, graph 30B is drawn with only one axis having the maximum trajectory height. Specifically, the graph 30B is a graph in which the maximum trajectory height corresponding to the calculated value of the head speed of the driver (for example, 45.2 m / s) in the circular region 1541 in FIG. 13 is plotted on the horizontal axis. Therefore, the area 1610 indicates an area indicating the maximum trajectory height corresponding to the calculated value of the head speed (for example, 45.2 m / s).

  The area Za1 is an area indicating the maximum trajectory height corresponding to the calculated value of the head speed at which the flight distance of the ball A1 is maximized when the driver hits the balls A1 to A3 with the driver. The same applies to the regions Za2 and Za3.

  FIG. 18 shows that the ball A1 is suitable for a medium trajectory shot, the ball A2 is suitable for a high trajectory shot, and the ball A3 is suitable for a low trajectory shot. Since the area 1610 indicates that the shot of the golfer has a high trajectory, the ball A2 is the most suitable golf ball for the golfer.

<Functional configuration>
FIG. 19 is a functional block diagram of the ball recommending device 10. Referring to FIG. 19, ball recommendation device 10 includes, as main functional components, information input unit 150, stationary period calculation unit 152, posture calculation unit 154, head speed calculation unit 156, trajectory calculation unit 158, And a recommendation unit 162. Basically, these are realized by the processor 102 of the ball recommendation device 10 executing a program stored in the memory 104 and giving instructions to the components of the ball recommendation device 10. Note that some or all of these functional configurations may be implemented by hardware. Further, the ball recommendation device 10 further includes an information storage unit 160 realized by the memory 104.

  The information input unit 150 receives inputs of acceleration information and angular velocity information detected by the sensor device 20 attached to the golf club 50. Note that the information input unit 150 may receive inputs of “swing tempo”, “forward warp angle”, “toe-down amount”, and “flexion coefficient” calculated by the sensor device 20. Typically, the information input unit 150 receives such information transmitted from the sensor device 20 via the communication interface 120. However, the information input unit 150 may receive the input of such information via the touch panel 106 (or the button 108).

  The still period calculation unit 152 calculates the still period according to the above (still detection method). The stationary period calculation unit 152 calculates a time t1 at which the composite angular velocity W based on the angular velocity information reaches the reference threshold Th. More specifically, the stationary period calculation unit 152 calculates the resultant acceleration AC, and calculates the time at which the amount of change per unit time of the resultant acceleration AC reaches a threshold or more as the impact time. The stationary period calculation unit 152 calculates a time t1 at which the combined angular velocity W becomes less than the reference threshold Th by going back from a time that is a predetermined time before the impact time.

  The stationary period calculation unit 152 determines that the golfer is stationary for a period Tc from time t2, which is a time Ta (for example, 0.5 seconds) earlier than the time t1, to time t3, which is a time Tb earlier than the time t1. Is calculated as the stationary period.

  The posture calculation unit 154 calculates the posture information of the golf club 50 based on the acceleration information and the angular velocity information according to the above (posture calculation method). Specifically, the posture calculation unit 154 calculates posture information from the start of the swing period to the end (at the time of impact). In particular, the posture calculation unit 154 calculates at least the shaft lean angle SLc and the attack angle ATc as the posture information of the golf club 50 at the time of impact. Note that the posture calculation unit 154 may calculate the lie angle Lc, the face angle FAc, and the swing path SWc as the posture information of the golf club 50 at the time of impact.

  Here, when the sensor device 20 is attached to the driver (for example, when the golf club 50 is the driver of the golfer), the posture calculator 154 converts the posture information of the golf club 50 into the posture information of the golfer driver. Is output to the trajectory calculation unit 158.

  On the other hand, it is assumed that the sensor device 20 is attached to another golf club different from the golfer driver (for example, the golf club 50 is not a golfer driver). In this case, the posture calculation unit 154 applies a predetermined relational expression for the posture angle to the calculated posture information of the golf club 50 (here, the shaft lean angle SLc and the attack angle ATc), and allows the golfer to use the driver. The posture information of the driver when it is assumed that the golf ball has been hit is calculated. For example, as shown in FIG. 7, a shaft lean angle SLc and an attack angle ATc corresponding to the driver are calculated. The posture calculation unit 154 outputs the calculated posture information of the driver to the trajectory calculation unit 158.

  The head speed calculation unit 156 calculates the head speed of the golf club 50 during the swing period based on the acceleration information and the angular velocity information. In particular, the head speed calculation unit 156 calculates the head speed at the time of impact.

  Here, when the sensor device 20 is attached to the driver of the golfer, the head speed calculation unit 156 outputs the head speed of the golf club 50 to the trajectory calculation unit 158 as the head speed of the golfer driver.

  On the other hand, when the sensor device 20 is attached to another golf club different from the driver of the golfer, the head speed calculation unit 156 calculates the head speed of the golf club 50 by a predetermined relational expression for the head speed. Is applied to calculate the head speed of the driver when it is assumed that the golfer has hit the golf ball with the driver. The head speed calculation unit 156 outputs the calculated head speed of the driver to the trajectory calculation unit 158.

  The trajectory calculation unit 158 calculates the maximum trajectory height of the golf ball hit by the driver based on the specification information of the driver of the golfer, the posture information of the driver at impact, and the head speed of the driver at impact. I do.

  As described above, the trajectory calculation unit 158 uses the driver's specification information, the attack angle and the shaft lean angle at the time of impact, and the head speed at the time of impact to obtain the ball initial speed, launch angle, and back Calculate the spin. The driver's specification information includes at least the club length and the loft angle. The trajectory calculation unit 158 calculates the maximum trajectory height by inputting the ball initial velocity, the launch angle, and the backspin into a trajectory equation.

  The information storage unit 160 stores a plurality of golf balls (e.g., balls A1 to A3) prepared in advance so that when the driver hits the golf ball, the flight distance of the golf ball is maximized. Information D1 indicating the head speed and (the combination of) the maximum trajectory height of the golf ball is stored.

  The information D1 includes information for defining the regions Xa1 to Xa3 in the graph 30. That is, the information D1 includes information indicating a combination of the head speed and the maximum trajectory height corresponding to each of the regions Xa1 to Xa3. Similarly, information D1 includes information for defining regions Ya1 to Ya3 in graph 30A and information for defining regions Za1 to Za3 in graph 30B.

  The recommendation unit 162 reads information D1 for each of the plurality of golf balls from the information storage unit 160. The recommendation unit 162 determines a plurality of golf balls based on the driver's head speed calculated by the head speed calculation unit 156, the maximum trajectory height calculated by the trajectory calculation unit 158, and information D1 for each of the plurality of golf balls. A golf ball suitable for a golfer is recommended from among the balls.

  Specifically, the recommendation unit 162 displays a screen (for example, a screen including any of the graphs 30 to 30B) for recommending a golf ball suitable for a golfer from among the plurality of golf balls on the display 110. This screen includes a graph (for example, graphs 30 to 30B) showing information D1 for each of the plurality of golf balls and information D2 based on the calculated head speed and the calculated maximum trajectory height. The information D2 may be stored in the information storage unit 160.

  When the screen includes the graph 30, regions Xa1 to Xa3 corresponding to the information D1 for each of the balls A1 to A3 and a circular region 1541 corresponding to the information D2 are displayed on the graph 30. When the screen includes the graph 30A, regions Ya1 to Ya3 corresponding to the information D1 for each of the balls A1 to A3 and a circular region 1541 corresponding to the information D2 are displayed on the graph 30A. When the screen includes the graph 30B, the regions Za1 to Za3 corresponding to the information D1 for each of the balls A1 to A3 and the region 1610 corresponding to the information D2 are displayed on the graph 30B.

  The recommendation unit 162 recommends a golf ball suitable for a golfer from the plurality of golf balls based on the positional relationship between the information D1 and the information D2 of each of the plurality of golf balls.

  In the example of FIG. 13, the recommendation unit 162 recommends the ball A2 corresponding to the area Xa2 closest to the circular area 1541 among the areas Xa1 to Xa3 as a golf ball most suitable for a golfer. In the example of FIG. 17, the recommendation unit 162 recommends the ball A2 corresponding to the area Ya2 including the center of the circular area 1541 among the areas Ya1 to Ya3 as a golf ball suitable for a golfer. In the case of the example of FIG. 18, the recommendation unit 162 recommends the ball A2 corresponding to the region Za2 having the largest range that overlaps with the region 1610 among the regions Za1 to Za3 as a golf ball suitable for a golfer.

<Advantages>
According to the present embodiment, the head speed and the maximum trajectory height of the driver, which are hard to change in conjunction with each other, are used as indices of the flight distance of the golf ball hit by the driver. Golf balls can be recommended.

  According to the present embodiment, the head speed and the maximum trajectory height of the driver are calculated by analyzing the golfer's swing. Therefore, even for a golfer of an intermediate level in which the hit ball is not stable, the head speed and the maximum trajectory height can be appropriately calculated, and the number of trial hits can be reduced.

  According to the present embodiment, a graph for recommending a golf ball suitable for a golfer is displayed on the display, so that the golfer can immediately grasp which golf ball is suitable for himself. In addition, by using a plurality of graphs, it is possible to recommend a golf ball that is multifaceted and suitable for a golfer.

<Modification>
In the above-described embodiment, the configuration in which the information from the sensor device 20 attached to the golf club 50 is used to recommend a golf ball suitable for a golfer has been described, but the present invention is not limited to this configuration. For example, a configuration may be used in which a golf ball suitable for a golfer is recommended based on the driver's head speed and a predetermined maximum trajectory height of a golf ball obtained using a known trajectory measuring device.

  FIG. 20 is a functional block diagram of a ball recommending device 10A according to a modification. Referring to FIG. 20, ball recommendation device 10A includes an acquisition unit 170, an information storage unit 160, and a recommendation unit 162A as main functional components.

  When a golfer hits a golf ball with a driver, a known trajectory measuring device measures each parameter of the golf ball immediately after impact to determine a head speed of the driver and a predetermined golf ball hit by the driver. Calculate the maximum trajectory height of the ball. Alternatively, the trajectory measuring device calculates the head speed of the driver and the maximum trajectory height of a predetermined golf ball hit by the driver from the measurement result of the head immediately before the impact (for example, head speed, shaft lean angle, and attack angle). Is calculated.

  The acquisition unit 170 acquires (receives) the head speed and the maximum trajectory height calculated by the trajectory measuring device from the trajectory measuring device. The communication method may be any of wireless communication and wired communication.

  The recommendation unit 162A recommends a golf ball suitable for a golfer from a plurality of golf balls based on the head speed and the maximum trajectory height acquired by the acquisition unit 170 and the information D1 about each of the plurality of golf balls. I do. The recommended method of the golf ball is the same as in the above-described embodiment.

  In the above modification, according to the configuration in which the trajectory measuring device calculates the head speed and the maximum trajectory height based on the measurement result of each parameter of the golf ball immediately after impact, if the golfer is a first-intermediate golfer, the hit ball is not hit. Because it is stable, the number of test hits may increase in order to recommend a golf ball with high accuracy. However, if this point is neglected, it has substantially the same advantages as the above-described embodiment.

  On the other hand, in the above modification, the configuration in which the trajectory measuring device calculates the head speed and the maximum trajectory height based on the measurement result of the head immediately before the impact has the same advantages as the above-described embodiment.

<Other embodiments>
(1) The ball recommendation device described above may have the function shown in FIG. 19 and the function shown in FIG. Specifically, the ball recommendation device uses the information received from the sensor device 20 to calculate the head speed of the driver and the maximum trajectory height of the golf ball, and to directly receive these from the trajectory measuring device. May be provided.

  In other words, the ball recommendation device may be configured to obtain the head speed and the maximum trajectory height by calculation using the information received from the sensor device 20, or to obtain these by receiving from the trajectory measuring device. The configuration may be as follows.

  When the ball recommendation device acquires the head speed and the maximum trajectory height by calculation using information from the sensor device 20, the function of the acquisition unit of the ball recommendation device is the information input unit 150, the stationary period calculation unit 152, a posture calculation unit 154, a head speed calculation unit 156, and a trajectory calculation unit 158. On the other hand, when the ball recommendation device acquires the head speed and the maximum trajectory height by receiving them from the trajectory measuring device, the function of the acquisition unit of the ball recommendation device corresponds to the function of the acquisition unit 170 in FIG.

  (2) In the above-described embodiment, as shown in Japanese Patent No. 634234, a configuration may be adopted in which the posture information of the golf club is corrected using the distortion information detected by the distortion sensor 210.

  (3) It is also possible to provide a program that causes a computer to execute the above-described control. Such a program is recorded on a non-transitory computer-readable recording medium such as a flexible disk, a CD-ROM (Compact Disk Read Only Memory), a ROM, a RAM, and a memory card attached to the computer, and is stored as a program product. Can also be provided. Alternatively, the program may be provided by being recorded on a recording medium such as a hard disk incorporated in the computer. Also, the program can be provided by downloading via a network.

  The program may be a program module that calls a necessary module at a predetermined timing and executes a process among program modules provided as a part of an operating system (OS) of the computer. In that case, the program itself does not include the above module, and the process is executed in cooperation with the OS. A program that does not include such a module can also be included in the program according to the present embodiment.

  Further, the program according to the present embodiment may be provided by being incorporated in a part of another program. Also in that case, the program itself does not include the module included in the other program, and the process is executed in cooperation with the other program. A program incorporated in such another program can also be included in the program according to the present embodiment.

  (4) The configuration exemplified as the above-described embodiment is an example of the configuration of the present invention, and can be combined with another known technique, and a part of the configuration is provided without departing from the gist of the present invention. It is also possible to change the configuration, such as omitting it.

  The embodiments disclosed this time are to be considered in all respects as illustrative and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  10, 10A ball recommendation device, 20 sensor device, 30, 30A, 30B graph, 50 golf club, 52 shaft, 54 ball, 102, 202 processor, 104, 204 memory, 106 touch panel, 110 display, 112 wireless communication unit, 113 Communication antenna, 114 memory interface, 115 recording medium, 116 speaker, 118 microphone, 120 communication interface, 150 information input unit, 152 stationary period calculation unit, 154 attitude calculation unit, 156 head speed calculation unit, 158 trajectory calculation unit, 160 information Storage unit, 162, 162A recommended unit, 170 acquisition unit, 206 acceleration sensor, 208 angular velocity sensor, 210 distortion sensor, 214 storage battery, 1000 ball recommended system.

Claims (11)

An acquisition unit that acquires a head speed of a driver by a golfer and a maximum trajectory height of a golf ball hit by the driver;
For each of a plurality of golf balls prepared in advance, the head speed of the driver and the maximum trajectory height of the golf ball are maximized when the golf ball is hit with the driver. An information storage unit for storing first information to be indicated;
A golf ball suitable for the golfer from the plurality of golf balls based on the head speed and the maximum trajectory height acquired by the acquiring unit and the first information about each of the plurality of golf balls; A golf ball recommendation device, comprising: The acquisition unit,
An information input unit for receiving input of acceleration information and angular velocity information detected by a sensor attached to the driver or another golf club shaft;
A posture calculation unit that calculates posture information of the driver at the time of impact based on the acceleration information and the angular velocity information;
A head speed calculation unit that calculates a head speed of the driver at impact based on the acceleration information and the angular velocity information;
The golf according to claim 1, further comprising: a trajectory calculation unit configured to calculate a maximum trajectory height of a golf ball hit by the driver based on the driver's specification information, the calculated attitude information, and the head speed. Ball recommendation device.   The attitude information according to claim 2, wherein the attitude information includes an attack angle indicating an angle of a direction of a swing trajectory with respect to the ground at the time of impact, and a shaft lean angle indicating an angle of the shaft with respect to a virtual plane perpendicular to the ground. Golf ball recommendation device. When the sensor is attached to the shaft of the other golf club,
The posture calculation unit calculates posture information of the other golf club based on the acceleration information and the angular velocity information, and calculates a posture information of the driver by applying a first relational expression to the calculated posture information. And
The head speed calculation unit calculates a head speed of the other golf club based on the acceleration information and the angular velocity information, and applies a second relational expression to the calculated head speed to calculate a head speed of the driver. The golf ball recommendation device according to claim 2, wherein the calculation is performed.   The golf ball recommendation device according to any one of claims 2 to 4, wherein the driver's specification information includes a club length and a loft angle of the driver.   The golf ball recommendation according to claim 1, wherein the obtaining unit receives, from the trajectory measuring device, a head speed of the driver measured by a trajectory measuring device and a maximum trajectory height of a golf ball hit by the driver. apparatus. The recommendation unit displays a screen for recommending a golf ball suitable for the golfer from among the plurality of golf balls on a display,
The screen includes a graph showing the first information about each of the plurality of golf balls, and second information based on the head speed and the maximum trajectory height acquired by the acquisition unit,
The said recommendation part recommends the golf ball suitable for the said golfer among the said several golf balls based on the positional relationship of each said 1st information and the said 2nd information in the said graph. The golf ball recommendation device according to any one of the above.   The golf ball recommendation device according to claim 7, wherein the graph is a graph in which a head speed of the driver is a first axis and a maximum trajectory height of the golf ball is a second axis.   The golf ball recommendation device according to claim 7, wherein the graph is a graph indicating a maximum trajectory height of the golf ball corresponding to the head speed acquired by the acquisition unit. A computer-implemented golf ball recommendation method,
Obtaining a head speed of the driver by the golfer and a maximum trajectory height of a predetermined golf ball hit by the driver,
For each of a plurality of golf balls prepared in advance, the computer is configured to maximize the flight distance of the golf ball when the golf ball is hit with the driver. Contains specific information indicating the trajectory height,
Recommending a golf ball suitable for the golfer from the plurality of golf balls based on the acquired head speed and the maximum trajectory height and the specific information for each of the plurality of golf balls. Golf ball recommendation method further including. A sensor device mounted on a shaft of a golfer driver or other golf club;
A golf ball recommendation device for recommending a golf ball suitable for the golfer,
The golf ball recommendation device,
For each of a plurality of golf balls prepared in advance, the head speed of the driver and the maximum trajectory height of the golf ball are maximized when the golf ball is hit with the driver. An information storage unit for storing specific information to be indicated,
An information input unit that receives inputs of acceleration information and angular velocity information detected by the sensor device;
A posture calculation unit that calculates posture information of the driver at the time of impact based on the acceleration information and the angular velocity information;
A swing information calculation unit that calculates a head speed of the driver at impact based on the acceleration information and the angular velocity information;
A trajectory calculation unit that calculates a maximum trajectory height of a golf ball hit by the driver based on the driver's specification information, the calculated attitude information, and the head speed;
A recommendation unit that recommends a golf ball suitable for the golfer from among the plurality of golf balls based on the calculated head speed and the maximum trajectory height and the specific information about each of the plurality of golf balls. And a golf ball recommendation system.