JP2015139561A - Swing measurement method and swing measurement device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a measurement method capable of improving measurement accuracy when measuring an evaluation index of a striking implement using an inertial sensor.SOLUTION: An inertial sensor 12 is mounted on a golf club 20 by roughly aligning a first axis of three-dimensional rectangular coordinates in the direction of the shaft 22 of the golf club 20 and the third axis in a direction parallel to the striking surface (face) of the golf club 20, respectively. The state in which the second axis of the three-dimensional rectangular coordinates is roughly aligned with a direction parallel to a projection line (first axis of the measurement space S) in the direction of the intended hit projected onto the ground G is the reference state for the golf club 20. The direction of the first axis when the golf club 20 is held in the reference state is displayed prior to swinging by adjustment assistance means 16 so as to allow visual confirmation and posture is adjusted by having the measured person F align the shaft 22 with the display.

Description

  The present invention relates to a swing measuring method and a swing measuring apparatus that measure an evaluation index of a swing of a hitting tool using an inertia sensor.

  In recent years, in response to miniaturization and high performance of inertial sensors, a technique for measuring a swing of a golf club or the like by using the inertial sensor has become widespread. For example, in the following Patent Document 1, using a sensor capable of measuring acceleration in three axes and an angular velocity or angle around three axes, a grip angular velocity at at least one time during a downswing, or at least one time during a downswing. A swing analysis method for obtaining an index including a grip speed and classifying a swing in a golf club is disclosed.

JP 2013-56074 A

In swing measurement by an inertial sensor, a position in an initial state (for example, at the start of measurement) is used as a reference point, and relative motion with respect to this reference point is measured. For this reason, in order to evaluate the swing with an absolute reference, it is necessary to perform calibration in accordance with preset reference coordinates. In particular, when measuring the moving direction of the golf club head with respect to predetermined reference coordinates, it is important to obtain posture information such as the orientation of the inertial sensor in the initial state.
In Patent Document 1 described above, since the address state of the golfer is used as a reference, there is a problem that a deviation from a preset reference coordinate cannot be recognized and the measurement accuracy is low.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to improve measurement accuracy when measuring an evaluation index of a swing of a hitting tool using an inertial sensor.

In order to solve the above-mentioned problems and achieve the object, a swing measuring method according to the invention of claim 1 is a swing measuring method for measuring an evaluation index of a swing of a hitting tool using an inertial sensor, wherein the inertial sensor Measures the acceleration and angular velocity of the impact tool using the origin of the three-dimensional orthogonal coordinate as a measurement point, and sets the first axis of the three-dimensional orthogonal coordinate in the axial direction of the impact tool and the third axis of the impact tool. The striking tool is attached to the striking tool substantially in parallel with the striking surface, and the striking tool has a second axis of the three-dimensional orthogonal coordinate in a direction parallel to a projection line on the ground in the striking direction of the striking tool. The reference step is a state substantially matched to the reference state, the adjustment step of adjusting the posture of the hitting tool to the reference state, the acceleration measuring step of measuring the acceleration of the hitting device during the swing, and the measured acceleration And calculating the evaluation index, and in the adjustment step, the direction of the first axis when the impact tool is held in the reference state is displayed so as to be visible, and the display and the axis line And adjusting the posture of the hitting tool so as to coincide with each other, and in the acceleration measuring step, the swing is performed from the posture adjusted by the adjusting step.
In the swing measuring method according to a second aspect of the present invention, in the adjusting step, the linear light is displayed in the direction of the first axis by the light emitting means, and the axis of the hitting tool is aligned with the light. The posture of the hitting tool is adjusted.
In the swing measuring method according to a third aspect of the present invention, in the adjusting step, a mirror with a linear mark in the direction of the first axis is installed at a position facing the swing position of the hitting tool. The posture of the hitting tool is adjusted by aligning the reflected axis of the hitting tool with the mark.
The swing measurement method according to a fourth aspect of the invention is installed in the adjustment step so that a projection line obtained by projecting the axis line on the ground when the hitting tool is placed at the reference position and a visual axis are parallel to each other. An image around the swing position of the hitting tool is taken using the camera, the image is displayed on the display screen together with the direction of the visual axis, and the axial direction of the hitting tool in the image is matched with the visual axis. Thus, the posture of the impacting tool is adjusted.
The swing measuring method according to the invention of claim 5 is characterized in that, in the acceleration measuring step, the measurement of the acceleration is started in response to an input of a trigger signal indicating that the adjustment of the posture of the hitting tool is completed. To do.
The swing measuring method according to the invention of claim 6 is characterized in that the hitting tool is a golf club.
A swing measuring apparatus according to a seventh aspect of the invention is a swing measuring apparatus that measures an evaluation index of a swing of a hitting tool using an inertial sensor, wherein the inertial sensor uses the origin of three-dimensional orthogonal coordinates as a measurement point. Measure the acceleration and angular velocity of the hitting tool, and make the first axis of the three-dimensional orthogonal coordinates substantially coincide with the axis of the hitting tool and the third axis in the direction parallel to the hitting surface of the hitting tool. The striking tool is attached to a striking tool, and the striking tool has a state in which the second axis of the three-dimensional orthogonal coordinates is substantially coincided with a projection line on the ground in the target striking direction of the striking tool as a reference state. Adjustment assisting means for assisting in adjusting the posture of the tool to the reference state, and a calculation unit for calculating the evaluation index using the acceleration of the hitting tool during the swing measured using the inertial sensor; The adjustment assisting means displays the direction of the first axis when the impact tool is held in the reference state so as to be visible, and causes the measurer F to match the display with the axis. The adjustment of the attitude of the impacting tool is assisted, and the inertial sensor measures the acceleration from the attitude adjusted using the adjustment assisting means.
In the swing measuring apparatus according to an eighth aspect of the present invention, the adjustment assisting means is a light emitting means for displaying linear light in the direction of the first axis, and aligning the axis of the hitting tool with the light. The posture of the hitting tool is adjusted.
The swing measuring apparatus according to a ninth aspect of the present invention is the mirror, wherein the adjustment assisting unit is a mirror provided with a linear mark in the direction of the first axis and opposed to the swing position of the hitting tool. The posture of the hitting tool is adjusted by aligning the axis of the hitting tool reflected in the mirror with the mark.
In the swing measuring apparatus according to the invention of claim 10, the adjustment assisting means is configured such that a projection line obtained by projecting the axis line on the ground when the hitting tool is placed at the reference position and a visual axis are parallel to each other. An installed camera, taking an image around the swing position of the impact tool using the camera, displaying the image on the display screen together with the visual axis direction, and indicating the axial direction of the impact tool in the image The posture of the hitting tool is adjusted by adjusting to the visual axis.
The swing measuring apparatus according to an eleventh aspect of the invention includes signal generation means for outputting a trigger signal indicating that the adjustment of the posture of the hitting tool is completed, and the inertial sensor receives the trigger signal and receives the trigger signal. The measurement of acceleration is started.
The swing measuring apparatus according to the invention of claim 12 is characterized in that the hitting tool is a golf club.

According to the first aspect of the present invention, the direction of the first axis when the striking tool is held in the reference state in the adjustment step is displayed so as to be visible, and the striking tool is made to match the display and the axis of the striking tool. Adjust the posture and swing. As a result, the direction of the three-dimensional orthogonal coordinates set in the inertial sensor can be made constant with respect to the measurement space, and the calculation accuracy of the evaluation index can be improved.
According to the second aspect of the invention, since the posture of the hitting tool is adjusted using the light emitting means capable of emitting linear light, the posture of the hitting tool can be adjusted with a simple configuration.
According to the invention of claim 3, since the posture of the hitting tool is adjusted using a mirror with a linear mark in the direction of the first axis, the posture of the hitting tool can be adjusted with a simple configuration.
According to the invention of claim 4, since the posture of the hitting tool is adjusted using the camera and the display screen whose visual axis is aligned with the direction of the first axis, the measurer can also swing the swing posture other than the hitting tool on the display screen. As a result, the swing quality can be improved. In addition, it is possible to instruct an adjustment direction by a third party using the captured image.
According to the fifth aspect of the present invention, the measurement of acceleration is started upon receiving the input of the trigger signal indicating that the adjustment of the attitude of the hitting tool is completed, so that the measurement start point (reference position) in the inertial sensor is clarified. be able to.
According to invention of Claim 6, it can measure using a golf club as an impact tool.
According to the invention of claim 7, the direction of the first axis when the impact tool is held in the reference state by the adjustment assisting means is displayed so as to be visible, and the impact is made so that the display coincides with the axis of the impact tool. Swing by adjusting the posture of the equipment. As a result, the direction of the three-dimensional orthogonal coordinates set in the inertial sensor can be made constant with respect to the measurement space, and the calculation accuracy of the evaluation index can be improved.
According to the invention of claim 8, since the posture of the hitting tool is adjusted using the light emitting means capable of emitting linear light as the adjustment assisting means, the posture of the hitting tool can be adjusted with a simple configuration.
According to the ninth aspect of the present invention, the posture of the hitting tool is adjusted by using a mirror with a linear mark in the direction of the first axis as the adjustment assisting means, so that the posture of the hitting tool is adjusted with a simple configuration. be able to.
According to the invention of claim 10, since the posture of the hitting tool is adjusted using the camera and the display screen whose visual axis is aligned with the direction of the first axis as the adjustment assisting means, the measurer can also perform the swing posture other than the hitting tool. It can be confirmed on the display screen, and the swing quality can be improved. In addition, it is possible to instruct an adjustment direction by a third party using the captured image.
According to the eleventh aspect of the present invention, the measurement of acceleration is started upon receiving the input of the trigger signal indicating that the adjustment of the attitude of the hitting tool is completed, so that the measurement start point (reference position) in the inertial sensor is clarified. be able to.
According to invention of Claim 12, it can measure using a golf club as an impact tool.

It is explanatory drawing which shows the structure of the swing measuring apparatus 10 concerning embodiment. 3 is an external view of an inertial sensor 12. FIG. 2 is a block diagram showing a configuration of an inertial sensor 12. FIG. 2 is a block diagram showing a configuration of a computer 14. FIG. 4 is an explanatory diagram of a movement locus of a golf club 20. FIG. It is explanatory drawing of each left-right approach (theta) LR. It is explanatory drawing of each up-and-down approach (theta) UD. It is explanatory drawing of face angle (phi) at the time of impact. It is explanatory drawing of the loft angle (alpha) at the time of impact. It is explanatory drawing of the lie angle (beta) at the time of impact. It is a flowchart which shows the procedure of the swing evaluation method of this Embodiment. It is explanatory drawing at the time of using the light emission means 162 as the adjustment assistance means 16. FIG. It is explanatory drawing at the time of using the mirror 164 as the adjustment assistance means 16. FIG. It is explanatory drawing at the time of using the mirror 164 as the adjustment assistance means 16. FIG. It is explanatory drawing at the time of using the camera 166 and the display screen 168 as the adjustment assistance means 16. FIG. It is explanatory drawing at the time of using the camera 166 and the display screen 168 as the adjustment assistance means 16. FIG. 4 is an explanatory diagram of a movement locus of a golf club 20. FIG. 5 is an explanatory diagram of reference coordinates in a measurement space S. FIG. It is explanatory drawing at the time of using the jig | tool 170 as the adjustment assistance means 16. FIG.

Exemplary embodiments of a swing measuring method and a swing measuring apparatus according to the present invention will be explained below in detail with reference to the accompanying drawings. In the present embodiment, a case where a golf club is used as a hitting tool will be described as an example.

(Embodiment)
FIG. 1 is an explanatory diagram illustrating a configuration of a swing measuring apparatus 10 according to the embodiment.
The swing measuring device 10 includes an inertial sensor 12, a computer 14 (calculation unit), and adjustment assisting means 16, and measures an evaluation index of the swing of the hitting tool using the inertial sensor 12.
In the present embodiment, the hitting tool is the golf club 20. The golf club 20 is largely constituted by a shaft 22, a golf club head 24 and a grip 26. A golf club head 24 is provided at one end of the shaft 22, and a grip 26 is provided at the other end.
On the ground G of the measurement space S, a ball placement position P0 for placing the golf ball B is determined in advance, and this ball placement position P0 is displayed by a mark or the like provided on the ground G. ing. Alternatively, a tee is provided at the ball placement position P0, and the golf ball B is placed on the tee.
Further, a target C as a target for launching the golf ball B is provided in front of the ball placement position P0. Although the ball placement position P0 and the target C are drawn close to each other in the drawing due to the constraints shown in the drawings, the ball placement position P0 and the target C are actually set to a predetermined distance (a flying distance such as a driver). It is assumed that there is a certain distance).
The measurer F swings the golf club 20 to launch the golf ball B placed at the ball placement position P0 by the face surface of the golf club head 24 toward the target C.
The acceleration and angular velocity at the time of the swing are measured by the inertial sensor 12, and calculation processing is performed by the computer 14, thereby calculating a swing evaluation index.
A straight line connecting the center point P1 of the golf ball B placed at the ball placement position P0 and the target C is the target line L.

In the measurement space S, reference coordinates centered on the ball placement position P0 are set.
FIG. 18 is an explanatory diagram of the reference coordinates in the measurement space S.
The reference coordinates of the measurement space S are centered on the ball mounting position P0, the first axis Y1 projecting the target line L on the ground G, the second axis Y2 perpendicular to the ground G, It is defined by a third axis Y3 extending in a direction perpendicular to the plane formed by the first axis Y1 and the second axis Y2.
An arbitrary position in the measurement space S can be specified using reference coordinates defined by the first axis Y1 to the third axis Y3.

FIG. 2 is a diagram illustrating an appearance of the inertial sensor 12.
FIG. 2A is an external perspective view of the inertial sensor 12, and FIG. 2B is a view showing a state where the inertial sensor 12 is attached to the golf club 20.
The inertial sensor 12 is a small sensor unit having a wireless communication function. The sampling frequency of the inertial sensor 12 is, for example, 500 Hz to 1000 Hz, and has a time resolution several times that of the sampling frequency of an existing magnetic sensor (for example, 240 Hz). Further, while the existing magnetic sensor is a wired system, the inertial sensor 12 can transmit the measurement result to the computer 14 by a wireless system.
The inertial sensor 12 includes a housing 122, a display unit 124, and operation buttons 126.
2A, the housing 122 of the inertial sensor 12 includes a front surface 1221, a rear surface 1222, an upper surface 1223, a lower surface 1224, a right side surface 1225, and a left side surface 1226, and has a thickness in the front-rear direction and a dimension larger than the thickness. It has a width in the left-right direction and a length in the up-down direction that is larger than the width, and has a rectangular plate shape.
The front surface 1221 of the housing 122 has a substantially rectangular shape whose longitudinal direction is parallel to the vertical direction of the housing 122.
A display unit 124 and operation buttons 126 are provided on the front surface 1221.
The display unit 124 is a liquid crystal monitor or the like, and displays a measurement state (display “measurement in progress” or the like) by the inertial sensor 12, a measurement result, and the like.
Note that the display unit 124 may be omitted, and for example, the measurement status of the inertial sensor may be visually recognized based on whether or not the LED or the like is lit or the lighting color.
The operation button 126 receives an instruction input for instructing the start and end of measurement by the inertial sensor 12.
The operation button 126 may be omitted, and an instruction input for instructing the start or end of measurement may be given from the outside (for example, the computer 14).
The rear surface 1222 that faces the front surface 1221 is provided with a fixing portion (not shown) for attaching the housing 122 to the golf club 20.

The inertial sensor 12 measures the acceleration and angular velocity of the measurement point in three-dimensional orthogonal coordinates in real time.
In the present embodiment, the three-dimensional orthogonal coordinates for measurement of the inertial sensor 12 are set with the center point of the housing 122 as the measurement point O and the measurement point O as the origin. Specifically, from the measurement point O, a first axis X1 is set in the direction of the lower surface 1224 of the housing 122, a second axis X2 is set in the direction of the right side 1225, and a third axis X3 is set in the direction of the rear surface 1222.
When the inertial sensor 12 is attached to the golf club 20, the first axis X <b> 1 is made to coincide with the axial direction of the golf club 20 that is the hitting tool, that is, the shaft 22. Further, the third axis X3 is made to coincide with the face surface of the golf club 20 in a parallel direction.
Note that the inclination of the shaft 22 (first axis X direction) of the golf club 20 from the ground G can be measured by specifying the gravity direction g in the inertial sensor 12.
Here, at the initial position of the swing (at the start of measurement), golf is performed so that the second axis X2 of the inertial sensor 12 coincides with the first axis Y1 (projection line of the target line L on the ground G) of the measurement space S. A state where the club 20 is held is referred to as a “reference state of the golf club 20”.
By holding the golf club 20 in the reference state, it is possible to define a correspondence between the reference coordinates in the measurement space S and the three-dimensional orthogonal coordinates for measurement of the inertial sensor 12, and the direction measured by the inertial sensor 12. Can be expressed by a relative positional relationship in the measurement space S.
Even if the golf club 20 is deviated from the reference state, if the deviation amount between the reference coordinate in the measurement space S and the three-dimensional orthogonal coordinates for measurement of the acceleration sensor 12 is known, the measurement result of the acceleration sensor 12 is calibrated. It becomes possible to do.

FIG. 3 is a block diagram showing the configuration of the inertial sensor 12.
The inertial sensor 12 includes a triaxial acceleration sensor 128, a triaxial gyro sensor 130, a processing unit 132, a wireless communication unit 134, and the like in addition to the display unit 124 and the operation button 126.
The triaxial acceleration sensor 128 measures the acceleration in the direction of each axis (X1, X2, X3) of the three-dimensional orthogonal coordinates at the measurement point O.
The three-axis gyro sensor 130 measures angular acceleration around each axis (X1, X2, X3) of the three-dimensional orthogonal coordinates at the measurement point O.
The wireless communication unit 134 transmits measurement data of the triaxial acceleration sensor 128 and the triaxial gyro sensor 130 to the computer 14.
The processing unit 132 performs activation of the inertial sensor 12, imparting a time stamp to measurement data, control of transmission of measurement data, and the like.
In the present embodiment, the processing unit 132 is configured by a microcomputer.
The processing unit 132 includes a CPU 132A, a ROM 132B, a RAM 132C, an interface 132D, a display driver 132E, and the like connected via an interface circuit (not shown) and a bus line.
The ROM 132B stores a control program for calculating the moving direction and moving speed of the moving body executed by the CPU 132A, and the RAM 132C provides a working area.
The interface 132D inputs measurement values of the three-axis acceleration sensor 128 and the three-axis gyro sensor 130 and supplies them to the CPU 132A, and receives an operation signal from the operation button 126 and supplies it to the CPU 132A.
The display driver 132E drives the display unit 124 based on the control of the CPU 132A.

Next, the configuration of the computer 14 will be described.
FIG. 4 is a block diagram showing the configuration of the computer 14.
The computer 14 calculates the behavior of the golf club 20 in the measurement space S based on the measurement result of the inertial sensor 12 and calculates a swing evaluation index.
The computer 14 includes a CPU 1402, a ROM 1404, a RAM 1406, a hard disk device 1408, a disk device 1410, a keyboard 1412, a mouse 1414, a display 1416, a printer 1418, an input / output interface 1420, connected via an interface circuit (not shown) and a bus line. A wireless communication unit 1422 and the like are included.
A ROM 1404 stores a control program and the like, and a RAM 1406 provides a working area.

The hard disk device 1408 stores an evaluation index calculation program that calculates the behavior of the golf club 20 in the measurement space S based on the measurement result of the inertial sensor 12 and calculates the swing evaluation index based on the behavior of the golf club 20. doing. The hard disk device 1408 stores a three-dimensional shape model that reproduces the golf club 20 in a three-dimensional coordinate system.
Here, a method for calculating an evaluation index in the evaluation index calculation program will be described.
As described above, the inertial sensor 12 is attached to the golf club 20. However, since the shape of the golf club 20 is known and substantially constant (the bending at the time of hitting can be ignored), the measurement point of the inertial sensor 12 is set. If fixed, the relative position between any point on the golf club 20 and the measurement point can be specified. The evaluation index calculation program calculates the position of each point of the golf club 20 at each time based on the measurement result of the inertial sensor 12, and reproduces the behavior of the golf club 20 during the swing on the virtual space on the RAM 1406. Then, various evaluation indexes for the swing are calculated.

In the present embodiment, for example, the following evaluation index is calculated in the evaluation index calculation program.
(1) Movement locus data as time series data indicating the movement locus of the golf club 20:
The movement locus data is indicated by the movement locus of the shaft 22 of the golf club 20 (FIG. 17) or by the movement locus of the center point of the face surface of the golf club 20 (FIG. 5).
FIG. 17A is a movement locus seen from the front of the measurer F, and FIG. 17B is a movement locus seen from the side of the measurer F on the dominant arm side.
(2) Head speed data based on movement trajectory data:
Based on the distance that the center point 410 (FIG. 5) of the face surface of the golf club 20 moves per unit time, the head speed during the swing is calculated.
(3) Left / right approach angle θLR:
As shown in FIG. 6, the left and right approach angle θLR is obtained by projecting the movement locus T and the target line on the horizontal plane when the movement locus T and the target line L of the center point 410 of the face surface 402 of the golf club 20 are projected onto the horizontal plane. An angle formed by L. In the drawing, an arrow F indicates the moving direction of the golf club head 24.
(4) Vertical approach angle θUD:
As shown in FIG. 7, the vertical approach angle θUD is vertical when the movement trajectory T of the center point 410 of the face surface 402 of the golf club 20 and the target line L are projected onto a vertical plane parallel to the target line L. An angle formed by the movement trajectory T and the target line L on the surface.
(5) Orientation data Df indicating the orientation of the golf club head 24 immediately before the face surface 402 hits the golf ball B:
In the present embodiment, the orientation data Df includes a hitting face angle φ, a hitting loft angle α, and a hitting lie angle β.
Hereinafter, a description will be given with reference to FIGS.
(5-1) The hitting face angle φ is a normal line H and a target line passing through the center point 410 of the face surface 402 immediately before the face surface 402 of the golf club 20 hits the golf ball B, as shown in FIG. When L is projected onto the horizontal plane, it is indicated by the angle formed by the normal H and the target line L on the horizontal plane.
(5-2) The loft angle α at the time of hitting is the normal H passing through the center point 410 of the face surface 402 immediately before the face surface 402 of the golf club 20 hits the golf ball B, as shown in FIG. This is indicated by an angle formed by a horizontal plane (ground G) intersecting the line H and a parallel plane.
(5-3) As shown in FIG. 10, the lie angle β at the time of hitting is a horizontal plane where the extension line of the shaft 22 immediately before the face surface 402 of the golf club 20 hits the golf ball B and the extension line intersect ( In this example, this is indicated by the angle formed by the ground G).
Note that the above-described swing evaluation index is an example, and it is needless to say that only a part of the above-described evaluation index may be calculated, or an evaluation index other than the above-described evaluation index may be calculated.

Returning to the description of FIG. 4, the disk device 1410 records and / or reproduces data on a recording medium such as a CD or a DVD.
The keyboard 1412 and the mouse 1414 receive operation inputs from the operator.
A display 1416 displays and outputs data such as the above-described evaluation index, and a printer 1418 prints and outputs the data. The display 1416 and the printer 1418 output data.
The input / output interface 1420 exchanges data with an external device.
The wireless communication unit 1422 exchanges data (measurement data and the like) with the inertial sensor 12 using wireless communication.
In this embodiment, the computer 14 is used as a device for calculating the swing evaluation index based on the measurement result of the inertial sensor 12, but the evaluation index is calculated by a small information processing device such as a smart phone or a tablet. Also good. For example, the inertial sensor 12 may be equipped with a function for calculating an evaluation index. In this case, the calculated evaluation index may be displayed on the display unit 124 of the inertial sensor 12, or may be transmitted to another information processing apparatus and output such as display.

Next, the swing measurement method of the present embodiment will be described with reference to the flowchart of FIG.
FIG. 11 is a flowchart showing the procedure of the swing measurement method of the present embodiment.
First, the measurer F attaches the inertial sensor 12 to the golf club 20 (step S10). The attachment position of the inertial sensor 12 is arbitrary, but a position that does not disturb the swing by the measurer F is preferable. In the example of FIG. 2B, it is attached near the boundary between the grip 26 and the shaft 22.
Next, the measurer F inputs the attachment position information of the inertial sensor 12 (step S12). The attachment position information is, for example, the distance between the reference point of the inertial sensor 12 after attachment (for example, the center point in the vertical and horizontal directions of the housing 122) and the end of the grip 26, the length of the golf club 20, the loft angle, and the line. It is a corner etc.
Subsequently, the measurer F adjusts the address posture so that the golf club 20 is in the reference state (step S14). That is, an adjustment process for adjusting the posture of the golf club 20 that is a hitting tool to the reference state is performed.
In the adjustment step of step S14, the direction of the first axis X1 when the golf club 20 is held in the reference state is displayed so as to be visible by the adjustment assisting means 16 (see FIG. 1), and the display and the axis (shaft 22). The posture of the golf club 20 is adjusted so as to match.

Here, details of the adjustment assisting means 16 will be described.
Specific examples of the adjustment assisting means 16 include the following aspects.
(1) Method Using Light Source As shown in FIG. 1, a light emitting unit 162 is used as the adjustment assisting unit 16. The light emitting means 162 is a laser, LED, or the like, and is a device that can irradiate linear light N1 in an arbitrary direction. The linear light may be continuous (linear) or discontinuous (dotted line or the like) within the irradiation region.
As shown in FIG. 12, the linear light N1 is displayed in the direction of the first axis X1 by the light emitting means 162, and the golf club 20 is positioned by aligning the axis (shaft 22) of the golf club 20 with the light N1. adjust.
(2) Method Using Mirror As shown in FIGS. 13 and 14, a mirror 164 is used as the adjustment auxiliary means 16. The mirror 164 is provided with a linear mark M in the direction of the first axis. The mirror 164 is installed at a position facing the swing position (ball placement position P0) of the golf club 20, and the axis (shaft 22) of the golf club 20 reflected on the mirror 164 is aligned with the mark so that the golf club 20 Adjust posture.
(3) Method Using Camera As shown in FIGS. 15 and 16, a camera 166 and a display screen 168 are used as the adjustment auxiliary means 16. The camera 166 is installed such that the axis (shaft 22) when the golf club 20 is placed at the reference position, that is, the projection line N2 obtained by projecting the first axis X1 onto the ground and the visual axis N3 are parallel to each other. . The camera 166 is used to capture an image around the swing position (ball placement position P0) of the golf club 20, and the captured image is displayed on the display screen 168 along with the visual axis N3 direction. And the attitude | position of the golf club 20 is adjusted by making the axis line (shaft 22) direction of the golf club 20 in an image match with the visual axis N3.
At this time, as shown in FIG. 15, the measurer F may adjust the posture of the golf club 20 while looking at the image displayed on the display screen 168, or as shown in FIG. The third person may adjust the posture of the golf club 20 by giving an instruction to the measurer F while viewing a display screen (not shown). Note that the display 1416 of the computer 14 may be used as the display screen 168.
Further, when the projection line N2 and the visual axis N3 of the camera 166 are not parallel, and the amount of deviation between the projection line N2 and the visual axis N3 is known, the display position of the visual axis N3 is shifted according to the amount of deviation. May be displayed on the display screen 168.
(4) Method Using Jig As shown in FIG. 19, a stand-like jig 170 capable of holding the golf club 20 in the reference state may be provided around the ball placement position P0 as the adjustment assisting means 16. FIG. 19A is a side view of the jig 170, and FIG. 19B is a front view of the jig 170. The jig 170 is formed so that the shaft 22 of the golf club 20 matches the shaft direction (first axis direction) when the golf club 20 is held in the reference state. By leaning the golf club 20 against the jig 170, the golf club 20 can be positioned in the reference state.
As illustrated in FIG. 19, the jig 170 includes a base 1702, a frame 1704, a support portion 1706, and a positioning plate 1708.
The base 1702 is placed on the ground G.
The frame 1704 is erected from the base 1702.
The support portion 1706 is provided on the frame 1704 and supports the shaft 22 of the golf club 20 so that the shaft 22 is detachable and the position and orientation of the golf club 20 can be adjusted. Various known structures can be used as the support portion 1706.
The positioning plate 1708 has a rectangular plate shape, and is attached to the base 1702 via a spacer 1710 so as to extend on a horizontal plane. The positioning plate 2008 is formed so as to extend linearly so that an edge portion 1708A having a sharp cross section on one side thereof is parallel to the ground G.
The golf club 20 can be easily positioned in the reference state by leaning the shaft 22 of the golf club 20 against the support 1706 of the jig 170 and aligning the position of the golf club head 24 with the positioning plate 1708.

Returning to the description of FIG. 11, when the adjustment of the address posture is completed so that the golf club 20 is in the reference state, the measurer F turns on the operation button 126 of the inertial sensor 12 and starts measurement (step S16). That is, the operation button 126 is a signal generating unit that outputs a trigger signal indicating that the adjustment of the posture of the golf club 20 has been completed, and the inertial sensor 12 starts measuring acceleration in response to the input of the trigger signal.
The measurer F starts the swing after turning on the operation button 126. The inertial sensor 12 performs an acceleration measurement process for measuring the acceleration of the golf club 20 during the swing (step S18). In the acceleration measurement step, the magnitude and direction of acceleration applied to the inertial sensor are acquired in time series. Moreover, the acquired measurement data is transmitted to the computer 14 using wireless communication.
Subsequently, the computer 14 generates behavior data indicating the behavior of the golf club 20 based on the time series data of the acceleration measured by the inertial sensor 12 and the three-dimensional shape model of the golf club 20 by the swing evaluation index program. Generate (step S20).
That is, the swing evaluation index program generates behavior data by moving the three-dimensional shape model in the virtual space based on the time series data of acceleration.
Then, the computer 14 calculates a swing evaluation index based on the behavior data (step S22), outputs the calculated evaluation index to the display 1416 or the like (step S24), and ends the processing according to this flowchart.

As described above, the swing measuring apparatus 10 according to the embodiment displays the direction of the first axis X1 when the golf club 20 is held in the reference state by the adjustment assisting means 16 so as to be visible. Measurement is performed by adjusting the posture of the golf club 20 so as to coincide with the axis (shaft 22) of the golf club 20.
Thereby, the direction of the three-dimensional orthogonal coordinate set in the inertial sensor 12 can be made constant with respect to the measurement space S, and the calculation accuracy of the evaluation index can be improved.
Particularly, since the golf club head is placed on the ground so that the lie angle and loft angle of the golf club 20 are catalog values, the reference state can be swung in a generally preferred address state, The swing quality can be improved.
Further, in the swing measuring apparatus 10, if the light emitting means 162 capable of emitting linear light or the mirror 164 with the linear mark M in the direction of the first axis X1 is used as the adjustment auxiliary means 16. The posture of the golf club 20 can be adjusted with a simple configuration.
Further, in the swing measurement apparatus 10, the posture of the golf club 20 is adjusted using the camera 166 and the display screen 168 in which the visual axis N3 is aligned with the direction of the first axis X1 as the adjustment assisting means 16, so that the measurer can play golf The swing posture other than the club 20 can also be confirmed on the display screen 168, and the swing quality can be improved. In addition, it is possible to instruct an adjustment direction by a third party using the captured image.
Further, since the swing measuring apparatus 10 starts measuring the acceleration upon receiving the input of the trigger signal indicating that the adjustment of the posture of the golf club 20 is completed, that is, pressing the operation button 126, the measurement start point in the inertial sensor 12 is measured. (Reference position) can be clarified.

  In the present embodiment, the example in which the golf club 20 is used as the hitting tool has been described. However, the present invention can be applied to various hitting tools having an axial shape such as a baseball bat, a tennis racket, and a hockey stick. .

  DESCRIPTION OF SYMBOLS 10 ... Swing measuring device, 12 ... Inertia sensor, 122 ... Housing, 124 ... Display part, 126 ... Operation button, 14 ... Computer, 16 ... Adjustment assistance means, 162 ... Light emission means, 164 ...... Mirror 166 Camera 168 Display screen 20 Golf club 22 Shaft 24 Golf club head 26 Grip 402 Face face 410 Center point

Claims (12)

A swing measurement method for measuring an evaluation index of a swing of a hitting tool using an inertial sensor,
The inertial sensor measures the acceleration and angular velocity of the impact tool using the origin of the three-dimensional orthogonal coordinate as a measurement point, and sets the first axis of the three-dimensional orthogonal coordinate in the axial direction of the impact tool and the third axis as the axis. Attached to the striking tool in substantially the same direction as the striking surface of the striking tool,
The striking tool has a state in which the second axis of the three-dimensional Cartesian coordinates substantially coincides with the projection line on the ground in the target striking direction of the striking tool as a reference state,
An adjustment step of adjusting the attitude of the impact tool to the reference state;
An acceleration measuring step of measuring acceleration of the hitting tool during the swing;
Calculating the evaluation index using the measured acceleration, and
In the adjusting step, the direction of the first axis when the striking tool is held in the reference state is displayed so as to be visible, and the posture of the striking tool is adjusted so that the display and the axis line coincide with each other. ,
In the acceleration measurement step, the swing is performed from the posture adjusted by the adjustment step.
The swing measuring method characterized by the above-mentioned. In the adjusting step, linear light is displayed in the direction of the first axis by the light emitting means, and the posture of the hitting tool is adjusted by matching the axis of the hitting tool with the light.
The swing measuring method according to claim 1. In the adjustment step, a mirror with a linear mark in the direction of the first axis is installed at a position facing the swing position of the impact tool, and the axis of the impact tool reflected in the mirror is used as the mark. Adjusting the posture of the hitting tool by matching,
The swing measuring method according to claim 1. In the adjustment step, the swing position of the hitting tool using a camera installed so that a projection line obtained by projecting the axis line on the ground and the visual axis when the hitting tool is placed at the reference position is parallel Taking a peripheral image, displaying the image on the display screen together with the direction of the visual axis, and adjusting the position of the impact tool by matching the axial direction of the impact tool in the image with the visual axis.
The swing measuring method according to claim 1. In the acceleration measurement step, the measurement of the acceleration is started in response to an input of a trigger signal indicating that the adjustment of the posture of the hitting tool is completed.
The swing measuring method according to any one of claims 1 to 4, wherein The hitting tool is a golf club;
The swing measurement method according to any one of claims 1 to 5, wherein A swing measuring device that measures an evaluation index of a swing of a hitting tool using an inertial sensor,
The inertial sensor measures the acceleration and angular velocity of the impact tool using the origin of the three-dimensional orthogonal coordinate as a measurement point, and sets the first axis of the three-dimensional orthogonal coordinate in the axial direction of the impact tool and the third axis as the axis. Attached to the striking tool in substantially the same direction as the striking surface of the striking tool,
The striking tool has a state in which the second axis of the three-dimensional Cartesian coordinates substantially coincides with the projection line on the ground in the target striking direction of the striking tool as a reference state,
Adjustment assisting means for assisting in adjusting the posture of the impact tool to the reference state;
A calculation unit that calculates the evaluation index using acceleration of the hitting tool during the swing measured using the inertial sensor,
The adjustment assisting means displays the direction of the first axis when the striking tool is held in the reference state so as to be visible, and causes the measurer F to match the display with the axis so as to match the striking tool. To help adjust the posture of the
The inertial sensor measures the acceleration from a posture adjusted using the adjustment assisting means;
A swing measuring apparatus characterized by that. The adjustment assisting means is a light emitting means for displaying linear light in the direction of the first axis,
Adjusting the attitude of the impact tool by aligning the axis of the impact tool with the light;
The swing measuring device according to claim 7. The adjustment assisting means is a mirror that attaches a linear mark in the direction of the first axis and is installed at a position facing the swing position of the impact tool,
Adjusting the attitude of the impact tool by aligning the axis of the impact tool reflected in the mirror with the mark;
The swing measuring device according to claim 7. The adjustment assisting means is a camera installed so that a projection line obtained by projecting the axis line on the ground and the visual axis when the impact tool is placed at the reference position are parallel to each other,
By taking an image around the swing position of the impact tool using the camera, displaying the image on the display screen together with the visual axis direction, and aligning the axial direction of the impact tool in the image with the visual axis Adjusting the posture of the impact tool,
The swing measuring device according to claim 7. Comprising signal generating means for outputting a trigger signal indicating that the adjustment of the posture of the striking tool has been completed,
The inertial sensor receives the trigger signal and starts measuring the acceleration;
The swing measuring apparatus according to claim 7, wherein The hitting tool is a golf club;
The swing measuring device according to any one of claims 7 to 11, wherein

Images