JP6428815B2 - Motion analysis device, motion analysis system, and motion analysis method - Google Patents

Description

The present invention, motion analysis device, a motion analysis system and motion analysis how like.

  The motion analysis device is used for motion analysis such as swing motion. The exercise equipment is swung during the swing. The grip of the exercise equipment is held by hand when shaking. When shaken, the posture of the exercise device changes along the time axis. An inertial sensor is attached to the exercise equipment. The swing motion is visually reproduced based on the output of the inertial sensor. As a specific example of such a motion analysis device, for example, a golf swing analysis device is disclosed as disclosed in Patent Document 1.

JP 2008-73210 A

  In golf, the direction of the hit ball is greatly influenced by the orientation of the face at the moment of impact. As you know, if you try to fit the club head face by returning your wrist just before the impact, the fit will be delayed, and returning the wrist will adversely affect the impact face and adversely affect the swing. . The movement of the wrist during a golf swing is difficult to observe with an optical motion capture using a camera or the like, and it is not possible to trace the movement of the delicate wrist. In the case of precise tracing, it is necessary to prepare a number of high-precision cameras, resulting in a large-scale measuring device. In addition, optical motion capture using a camera or the like can only be measured indoors and cannot be used in general outdoor practice.

According to at least one aspect of the present invention, motion analysis device capable of visually and easily presenting the motion of the wrist in association with the swing motion can be provided a motion analysis system and motion analysis how.

  (1) According to one aspect of the present invention, a first calculation unit that calculates a movement locus of the exercise tool during a swing using an output of the inertia sensor, and a shaft portion of the exercise tool using the output of the inertia sensor A second calculation unit that calculates a rotation angle generated around the axis of the movement tool, and the rotation angle obtained by the second calculation unit is added to the movement locus of the exercise tool obtained by the first calculation unit. The present invention relates to an associated motion analysis device.

  The exercise equipment is swung during the swing. When shaken, the posture of the exercise device changes along the time axis. The change in posture is detected by an inertial sensor. Thus, the movement trajectory of the exercise tool is specified along the time axis. A swing motion is visually presented on the screen. At this time, wrist movement is simultaneously detected by an inertial sensor. In this way, wrist movement is visually presented in association with the swing motion. In response to these wrist movements, the subject can make improvements to the swing form. Compared to optical motion capture using a camera, etc., it can trace the delicate movement of the wrist return without using a large-scale device, and attach an inertial sensor to a golf club or other exercise equipment or the subject's hand. It is easy to measure even outdoors.

  (2) The motion analysis apparatus can synchronize the calculation result of the second calculation unit with the calculation result of the first calculation unit. The movement trajectory of the exercise tool calculated by the first calculation unit and the rotation angle generated around the shaft of the exercise tool calculated by the second calculation unit are synchronized to return the wrist during the swing more accurately. It is possible to measure changes in timing and angle of the hitting surface.

  (3) The motion analysis apparatus may include a display unit that displays data in which the rotation angle obtained by the second calculation unit is associated with the movement locus of the exercise tool obtained by the first calculation unit. . The display unit can display the wrist return timing during swing and the change in angle of the ball striking surface as an indicator of progress of exercise.

  (4) The display unit can display a marking together with a movement trajectory of the exercise tool, and the marking is a rotation generated around the shaft of the exercise tool calculated by the second calculation unit. The direction can be changed according to the change of the corner. Since the shaft of the exercise tool is rod-shaped, there is a problem that it is difficult for the subject to grasp how much the subject is rotating even if the rotation around the shaft axis is displayed. Therefore, by displaying a marking indicating the change in the rotation angle around the shaft of the exercise tool along with the movement track of the exercise tool, the display unit displays the state of the wrist return and the angle of the ball striking surface. The change can be easily displayed to the subject.

  (5) The marking may include a flat surface that changes direction according to the movement of the striking surface of the exercise tool. The rotation of the grip, that is, the rotation of the wrist is expressed by the rotation of the plane. Thus, the subject can clearly grasp the wrist rotation from the image. In response to this grasp, the subject can make improvements to the swing form.

  (6) The marking may be displayed in a three-dimensional shape. As a result, the test subject can clearly recognize the movement of the wrist conceptually.

  (7) The display unit can display a surface rotating around an axis of the shaft portion of the exercise tool on the movement locus of the exercise tool. In this way, the wrist rotation is expressed by the exercise equipment itself. The subject can visually check the movement of the exercise equipment. Through these confirmations, subjects can make improvements to the swing form.

  (8) The inertial sensor can include a detection axis parallel to the axis of the shaft portion of the exercise tool, and can detect an angular velocity generated around the detection axis. Thus, when one detection axis of the inertial sensor is aligned with the axis of the grip, the calculation process can be simplified in detecting the rotation angle around the axis.

  (9) According to another aspect of the present invention, the output of the inertial sensor is used to calculate the movement trajectory of the exercise tool during a swing, and the shaft of the exercise tool is used to determine the axis of the shaft of the exercise tool. Means for calculating a rotation angle generated around, and relates to a motion analysis apparatus that associates the rotation angle with a movement locus of the exercise tool.

  (10) According to another aspect of the present invention, a procedure for calculating a movement trajectory of the exercise tool during a swing using the output of the inertia sensor, and an axis of the shaft portion of the exercise tool using the output of the inertia sensor A procedure for calculating a rotation angle of the exercise tool generated around, and a procedure for associating the rotation angle obtained by the second calculation unit with a movement locus of the exercise tool obtained by the first calculation unit. The present invention relates to a motion analysis program to be executed by a computer.

  The exercise equipment is swung during the swing. When shaken, the posture of the exercise device changes along the time axis. The change in posture is detected by an inertial sensor. Thus, the movement trajectory of the exercise tool is specified along the time axis. A swing motion is visually presented on the screen. At this time, wrist movement is simultaneously detected by an inertial sensor. In this way, wrist movement is visually presented in association with the swing motion. In response to these wrist movements, the subject can make improvements to the swing form. Compared to optical motion capture using a camera, etc., it can trace the delicate movement of the wrist return without using a large-scale device, and attach an inertial sensor to a golf club or other exercise equipment or the subject's hand. Measurement is easy even outdoors.

It is a conceptual diagram which shows roughly the structure of the golf swing analyzer which concerns on one Embodiment of this invention. It is a conceptual diagram which shows roughly the relationship between a motion analysis model, a golfer, and a golf club. It is a block diagram which shows roughly the structure of the arithmetic processing circuit which concerns on one Embodiment. It is a figure which shows an example of the image which expresses the movement locus | trajectory of a golf club visually. It is a figure which shows an example of the image which expresses the movement locus | trajectory of a golf club visually.

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. The present embodiment described below does not unduly limit the contents of the present invention described in the claims, and all the configurations described in the present embodiment are essential as means for solving the present invention. Not necessarily.

(1) Configuration of Golf Club Analysis Device FIG. 1 schematically shows the configuration of a golf swing analysis device (motion analysis device) 11 according to an embodiment of the present invention. The golf swing analysis device 11 includes an inertial sensor 12, for example. For example, an acceleration sensor and a gyro sensor are incorporated in the inertial sensor 12. The acceleration sensor can individually detect acceleration in three axial directions orthogonal to each other. The gyro sensor can individually detect the angular velocity around each of three axes orthogonal to each other. The inertial sensor 12 outputs a detection signal. The acceleration and angular velocity are specified for each axis in the detection signal. The acceleration sensor and the gyro sensor detect acceleration and angular velocity information with relatively high accuracy.

  The inertial sensor 12 is attached to a golf club (exercise tool) 13. The golf club 13 includes a shaft 13a and a grip 13b. The grip 13b is gripped by hand. The grip 13b is formed coaxially with the axis of the shaft 13a. A club head 13c is coupled to the tip of the shaft 13a. Desirably, the inertial sensor 12 is attached to the shaft 13 a or the grip 13 b of the golf club 13. The shaft 13a refers to a rod-like portion including the grip 13b to the club head 13c. The inertial sensor 12 may be fixed to the golf club 13 so as not to be relatively movable. Here, when the inertial sensor 12 is attached, one of the detection axes of the inertial sensor 12 is aligned with the axis of the shaft 13a. The other detection axis of the inertial sensor 12 is adjusted to the orientation of the face (ball striking surface) of the club head 13c.

  The golf swing analysis device 11 includes an arithmetic processing circuit 14. An inertial sensor 12 is connected to the arithmetic processing circuit 14. In connection, a predetermined interface circuit 15 is connected to the arithmetic processing circuit 14. The interface circuit 15 may be connected to the inertial sensor 12 by wire or may be connected to the inertial sensor 12 by wireless. A detection signal is supplied from the inertial sensor 12 to the arithmetic processing circuit 14.

  A storage device 16 is connected to the arithmetic processing circuit 14. The storage device 16 can store, for example, a golf swing analysis software program (motion analysis program) 17 and related data. The arithmetic processing circuit 14 executes a golf swing analysis software program 17 to realize a golf swing analysis method. The storage device 16 can include a DRAM (Dynamic Random Access Memory), a mass storage device unit, a non-volatile memory, and the like. For example, in the DRAM, the golf swing analysis software program 17 is temporarily held when the golf swing analysis method is executed. A golf swing analysis software program 17 and data are stored in a mass storage unit such as a hard disk drive (HDD). The nonvolatile memory stores a relatively small capacity program such as BIOS (basic input / output system) and data.

  An image processing circuit 18 is connected to the arithmetic processing circuit 14. The arithmetic processing circuit 14 sends predetermined image data to the image processing circuit 18. A display device 19 is connected to the image processing circuit 18. In connection, a predetermined interface circuit (not shown) is connected to the image processing circuit 18. The image processing circuit 18 sends an image signal to the display device 19 according to the input image data. An image specified by the image signal is displayed on the screen of the display device 19. The display device 19 is a liquid crystal display or other flat panel display. Here, the arithmetic processing circuit 14, the storage device 16, and the image processing circuit 18 are provided as a computer device, for example.

  An input device 21 is connected to the arithmetic processing circuit 14. The input device 21 includes at least alphabet keys and numeric keys. Character information and numerical information are input from the input device 21 to the arithmetic processing circuit 14. The input device 21 may be composed of a keyboard, for example. The combination of the computer device and the keyboard may be replaced with, for example, a smartphone, a mobile phone terminal, a tablet PC (personal computer), or the like.

(2) Motion analysis model The arithmetic processing circuit 14 defines a virtual space. The virtual space is formed in a three-dimensional space. A three-dimensional space specifies a real space. As shown in FIG. 2, the three-dimensional space has an absolute reference coordinate system (overall coordinate system) Σ _xyz . In the three-dimensional space, a three-dimensional motion analysis model 26 is constructed according to the absolute reference coordinate system Σ _xyz . The rod 27 of the three-dimensional motion analysis model 26 is point-constrained at a fulcrum 28 (coordinate x). The rod 27 operates three-dimensionally as a pendulum around the fulcrum 28. The position of the fulcrum 28 can be moved. Here, as the absolute reference coordinate system sigma _xyz, the position of the center of gravity 29 of the rod 27 is identified by the coordinates _{x g,} the position of the club head 13c can be located at the coordinates _{x h.}

が特定され、角速度信号では角速度ω_１、ω_２が特定される。 The three-dimensional motion analysis model 26 corresponds to a model of the golf club 13 at the time of swing. The pendulum rod 27 projects the shaft 13 a of the golf club 13. The fulcrum 28 of the rod 27 projects the grip 13b. The inertial sensor 12 is fixed to the rod 27. According to the absolute reference coordinate system Σ _xyz, the position of the inertial sensor 12 is specified by the coordinate x _s . The inertial sensor 12 outputs an acceleration signal and an angular velocity signal. In the acceleration signal, the acceleration from which the influence of the gravitational acceleration g is subtracted.

And the angular velocities ω ₁ and ω ₂ are specified in the angular velocity signal.

Similarly, the arithmetic processing circuit 14 fixes the local coordinate system Σ _s to the inertial sensor 12. The origin of the local coordinate system Σ _s is set to the origin of the detection axis of the inertial sensor 12. The y axis of the local coordinate system Σ _s coincides with the axis of the shaft 13a. The x axis of the local coordinate system Σ _s coincides with the hitting direction specified by the face direction. Therefore, the fulcrum position l _sj is specified by (0, l _sji , 0) according to the local coordinate system Σ _s . Similarly, on this local coordinate system Σ _s , the position l _{sg of the} center of gravity 29 is specified by (0, l _sgy , 0), and the position l _sh of the club head 13c is specified by (0, l _shy , 0). .

スイング軌跡算出部３１は算出された加速度に基づきグリップ１３ｂの移動速度を算出する。ここでは、次式に従って加速度に規定のサンプリング間隔ｄｔで積分処理が施される。Ｎはサンプル数を示す（以下、同じ）。

さらにスイング軌跡算出部３１は算出された速度に基づきグリップ１３ｂの位置を算出する。ここでは、次式に従って速度に規定のサンプリング間隔ｄｔで積分処理が施される。

スイング軌跡算出部３１は予め仮想三次元空間内で局所座標系Σ_ｓの位置（またはグリップ１３ｂの位置）を特定する。局所座標系Σ_ｓの変位またはグリップ１３ｂの変位が仮想三次元空間内の座標系に変換されると、ゴルフクラブ１３の位置が特定される。 (3) Configuration of Arithmetic Processing Circuit FIG. 3 schematically shows the configuration of the arithmetic processing circuit 14 according to an embodiment. The arithmetic processing circuit 14 includes a swing locus calculation unit 31 as a first calculation unit and a rotation angle calculation unit 32 as a second calculation unit. The swing locus calculation unit 31 is connected to the inertial sensor 12. An output signal is supplied from the inertial sensor 12 to the swing locus calculation unit 31. Here, the output of the inertial sensor 12 includes acceleration detected along the three orthogonal axes and angular velocity detected around the three orthogonal axes, respectively. The swing trajectory calculation unit 31 detects the position and posture of the golf club 13 based on the output of the inertia sensor 12. The swing trajectory calculation unit 31 detects the positions of the grip 13b and the club head 13c during exercise, for example. For detection, the swing trajectory calculation unit 31 calculates the acceleration of the grip 13b according to the following equation, for example. In calculating the acceleration, the swing locus calculation unit 31 specifies the position l _{sj of the} grip 13b according to the local coordinate system Σ _s inherent to the inertial sensor 12. In specifying, the swing trajectory calculation unit 31 acquires position information from the storage device 16. The storage device 16 stores in advance the position l _{sj of the} grip 13b. The position l _{sj of the} grip 13b may be specified via the input device 21, for example.

The swing locus calculation unit 31 calculates the moving speed of the grip 13b based on the calculated acceleration. Here, integration processing is performed on the acceleration at a specified sampling interval dt according to the following equation. N indicates the number of samples (hereinafter the same).

Further, the swing trajectory calculation unit 31 calculates the position of the grip 13b based on the calculated speed. Here, integration processing is performed on the speed at a specified sampling interval dt according to the following equation.

The swing trajectory calculation unit 31 specifies the position of the local coordinate system Σ _s (or the position of the grip 13b) in advance in the virtual three-dimensional space. When the displacement of the displacement or the grip 13b of the local coordinate system sigma _s is converted into the coordinate system in the virtual three-dimensional space, the position of the golf club 13 is identified.

Similarly, the swing trajectory calculation unit 31 detects the position of the club head 13c according to the following equation. In detecting the position, the swing trajectory calculation unit 31 specifies the position l _sh of the club head 13 c according to the unique local coordinate system Σ _s of the inertial sensor 12. In specifying, the swing trajectory calculation unit 31 acquires position information from the storage device 16. The storage device 16 stores in advance the position l _{sh of the} club head 13c. The position l _sh of the club head 13c may be specified via the input device 21, for example.

その結果、単位時間で累積される時刻ごとに初期位置からの変化量は算出される。こうして時間軸に従ってグリップ１３ｂの回転角θｎは特定される。 The rotation angle calculation unit 32 is connected to the inertial sensor 12. An output from the inertial sensor 12 is supplied to the rotation angle calculation unit 32. The rotation angle calculation unit 32 detects the rotation angle θn (n = 1,..., N) of the grip 13b around the axis from the initial position of the angular position “0 °” based on the output of the inertial sensor 12. In the detection, the rotation angle calculation unit 32 calculates a change amount of the rotation angle per unit time. As shown in the following equation, the calculated change amount is accumulated.

As a result, the amount of change from the initial position is calculated for each time accumulated in unit time. Thus, the rotation angle θn of the grip 13b is specified along the time axis.

  In detecting the rotation angle θn, the rotation angle calculation unit 32 detects the initial position of the grip 13b around the axis of the grip 13b (coaxial to the shaft 13a) based on the output of the inertial sensor 12. In the detection, the rotation angle calculation unit 32 acquires the angular velocity at the time of addressing around one detection axis (here around the y axis) parallel to the shaft 13a by the inertial sensor 12. The rotation angle calculation unit 32 sets the acquired angular velocity to an initial value. Since no angular velocity is generated around the y-axis at the time of addressing, the angular position “0 ° (zero degree)” (= initial position) is set when the angular velocity stops at “0 (zero)”.

  Although not shown, the arithmetic processing circuit 14 may include a synchronization unit that synchronizes the calculation result from the swing locus calculation unit 31 and the calculation result from the rotation angle calculation unit 32 with each other. The synchronization unit is connected to the swing locus calculation unit 31 and the rotation angle calculation unit 32. Output signals are supplied from the swing trajectory calculation unit 31 and the rotation angle calculation unit 32 to the synchronization unit. The synchronization unit synchronizes the rotation angle θn of the grip 13 b calculated by the rotation angle calculation unit 32 with the position and posture of the golf club 13 calculated by the swing locus calculation unit 31. As a result, the angular position of the grip 13b is specified around the axis of the grip 13b at each position of the golf club 13. In such identification, the position of the golf club 13 and the rotation angle of the grip 13b calculated based on the acceleration and the angular velocity output from the inertial sensor 12 at the same time may be associated with each other on a one-to-one basis.

  The arithmetic processing circuit 14 includes an image data generation unit 34 as a display unit. The image data generation unit 34 is connected to the swing locus calculation unit 31 and the rotation angle calculation unit 32. Output signals are supplied to the image data generation unit 34 from the swing locus calculation unit 31 and the rotation angle calculation unit 32. The image data generation unit 34 includes a movement trajectory image generation unit 35, a surface rotation image generation unit 36, and a cube image generation unit 37. The movement locus image generation unit 35 generates an image for visually displaying the movement locus of the golf club 13 based on the position and posture of the golf club 13. The surface rotation image generation unit 36 generates an image (marking) that displays a surface, that is, a face that is defined on the golf club 13 and rotates around the axis of the grip 13b. The orientation of the face at the same time is specified for each position of the movement locus. The cube image generation unit 37 generates a cube image having a ridge line parallel to the axis of the grip 13b. The cube is defined with one plane having a geometric outline (here, a square outline) extending parallel to the axis of the grip 13b. The plane of the cube changes its direction around the axis of the grip 13b according to the change in the rotation angle θn of the grip 13b. The images at the same time are associated with each other and output from the image data generation unit 34 as one image data. Note that the marking can be a three-dimensional shape such as a curved surface or a sphere other than a cube in addition to a flat surface or a cube.

  The arithmetic processing circuit 14 includes a drawing unit 38. The drawing unit 38 is connected to the image data generation unit 34. Image data is supplied from the image data generation unit 34 to the drawing unit 38. The drawing unit 38 draws an image that visually displays the movement locus of the golf club 13 based on the output signal of the movement locus image generation unit 35. The drawing unit 38 superimposes the face image and the cube image on the movement locus image of the golf club 13 for each position. As a result, an image that is visually displayed while associating the rotation angle of the face and the rotation angle of the cube with the movement locus of the golf club 13 is generated in the virtual three-dimensional space. Here, the drawing unit 38 draws an animation with continuous image data along the time axis.

(4) Operation of Golf Swing Analysis Device The operation of the golf swing analysis device 11 will be briefly described. First, a golfer's golf swing is measured. Prior to the measurement, necessary information is input from the input device 21 to the arithmetic processing circuit 14. Here, according to the three-dimensional motion analysis model 26, the input of the position l _{sj of the} fulcrum 28 according to the local coordinate system Σ _s and the rotation matrix R ⁰ of the initial posture of the inertial sensor 12 is prompted. The input information is managed under a specific identifier, for example. The identifier may identify a specific golfer.

  Prior to measurement, the inertial sensor 12 is attached to the shaft 13 a of the golf club 13. The inertial sensor 12 is fixed to the golf club 13 so as not to be relatively displaced. Here, one of the detection axes of the inertial sensor 12 is aligned with the axis of the shaft 13a. One of the detection axes of the inertial sensor 12 is adjusted to the hitting direction specified by the direction of the face (hitting surface).

Prior to execution of the golf swing, measurement of the inertial sensor 12 is started. At the start of operation, the inertial sensor 12 is set to a predetermined position and posture. These positions and postures correspond to those specified by the rotation matrix R ⁰ of the initial posture. The inertial sensor 12 continuously measures acceleration and angular velocity at specific sampling intervals. The sampling interval defines the measurement resolution. The detection signal of the inertial sensor 12 is sent to the arithmetic processing circuit 14 in real time. The arithmetic processing circuit 14 receives a signal specifying the output of the inertial sensor 12.

  The golf swing starts at the address, takes back, halfway back, top to down swing, impact, follow through, and finish. When the golf club 13 is shaken, the posture of the golf club 13 changes along the time axis. The inertial sensor 12 outputs a detection signal according to the posture of the golf club 13. At this time, the swing trajectory calculation unit 31 detects the position and posture of the golf club 13 based on the output of the inertial sensor 12. The rotation angle calculation unit 32 detects the angular position of the grip 13b around the axis of the grip 13b based on the output of the inertial sensor 12. The image data generation unit 34 generates three-dimensional image data (for example, polygon data) that specifies a face image and a cube image in association with the movement locus of the golf club 13 at each time. The drawing unit 38 draws the image of the face 41 and the image of the cube 42 in association with the movement trajectory T of the golf club 13 based on the three-dimensional image data, for example, as shown in FIGS. The rotation of the face 41 and the rotation of the cube 42 represent the rotation (return) of the wrist. In this way, the swing motion and the wrist turn are expressed visually in the image. The drawing data is sent to the image processing circuit 18, and the image is displayed on the screen of the display device 19 according to the drawing data. As a result, the wrist movement is visually presented in association with the swing motion. In response to these wrist movements, the subject can make improvements to the swing form. Moreover, the drawing unit 38 draws an animation with continuous image data according to the time axis. Thus, the swing motion is reproduced on the screen along with the wrist movement. Through observation of such reproduction, the subject can make improvements to the swing form. Since the shaft of the exercise tool is rod-shaped, it is difficult to determine how much the subject is rotating even if the rotation around the shaft axis is displayed. By displaying markings indicating a change in the rotation angle that occurs around the wrist, it is possible to display the wrist turn-back state and the change in the angle of the ball striking face in an easily understandable manner.

  In measuring the golf swing, the subject first takes the address posture. At this address, the subject reproduces the posture at the moment of impact. As a result, the posture at the moment of impact is extracted from a series of operations “golf swing”. At this time, the golf club 13 is held in a stationary posture. The rotation angle calculation unit 32 sets an initial position of the angular position “0 °” and starts calculating the rotation angle.

  In the image, the plane 43 of the cube 42 changes its direction according to the rotation of the grip 13b. The rotation of the grip 13b, that is, the rotation of the wrist is expressed by the rotation of the plane 43. Thus, the subject can clearly grasp the wrist rotation from the image. In response to this grasp, the subject can make improvements to the swing form. In particular, the cube 42 reflects the three orthogonal axes of the grip 13b. As a result, the test subject can clearly recognize the movement of the wrist conceptually.

  In presenting the swing motion, the face 41 is specified in the image. Thus, the rotation of the wrist is expressed by the golf club 13 itself. The subject can visually confirm the movement of the golf club 13. Through these confirmations, subjects can make improvements to the swing form.

  The inertial sensor 12 detects acceleration along the three orthogonal axes, and detects angular velocity around the three orthogonal axes. Thus, the position and posture of the golf club 13 and the rotation angle of the grip 13b are detected by one inertial sensor 12. Moreover, the inertial sensor 12 has a detection axis parallel to the axis of the grip 13b and detects the angular velocity around the detection axis. Thus, when one detection axis of the inertial sensor 12 is aligned with the axis of the grip 13b, the calculation process is simplified in detecting the rotation angle around the axis.

  In the above embodiment, each functional block of the arithmetic processing circuit 14 is realized in accordance with the execution of the golf swing analysis software program 17. However, each functional block may be realized by hardware without depending on software processing. In addition, the golf swing analysis device 11 may be applied to swing analysis of an exercise tool (for example, a tennis racket, a table tennis racket, or a baseball bat) that is shaken by a hand. Further, although the swing trajectory calculation unit 31 and the rotation angle calculation unit 32 of FIG. 3 are described separately, they may be combined into one calculation unit.

  Although the present embodiment has been described in detail as described above, it will be easily understood by those skilled in the art that many modifications can be made without substantially departing from the novel matters and effects of the present invention. Therefore, all such modifications are included in the scope of the present invention. For example, a term described with a different term having a broader meaning or the same meaning at least once in the specification or the drawings can be replaced with the different term in any part of the specification or the drawings. Further, the configurations and operations of the inertial sensor 12, the golf club 13, the arithmetic processing circuit 14, the three-dimensional motion analysis model 26, the swing locus calculation unit 31, the rotation angle calculation unit 32, and the like are not limited to those described in the present embodiment. Various modifications are possible. In addition to golf, the present invention can also be applied to exercises that use swing motions such as tennis and baseball.

  11 motion analysis device (golf swing analysis device), 12 inertial sensor, 13 motion portion (golf club), 13a shaft portion (shaft), 14 computer (arithmetic processing circuit), 17 motion analysis program (golf swing analysis software program), 31 First detection unit (swing trajectory calculation unit), 32 Second detection unit (rotation angle calculation unit), 34 Display unit (image data generation unit), 41 surface (face), 42 marking (cube), 43 plane, T Movement trajectory

Claims (6)

A calculation unit for calculating a rotation angle generated around a detection axis of the inertial sensor with a swing using an output of the inertial sensor;
A display unit for displaying the marking based on the rotation angle obtained by the calculation unit;
With
The motion analysis apparatus according to claim 1, wherein the marking has a cubic shape whose direction changes according to a change in the rotation angle calculated by the calculation unit. The motion analysis apparatus according to claim 1,
The marking displays the change in angle from the initial position of the swing. The motion analysis apparatus according to claim 1 or 2,
The motion analysis apparatus characterized in that the marking displays a direction perpendicular to at least one surface of the cube shape. The motion analysis apparatus according to any one of claims 1 to 3,
A motion analysis apparatus characterized in that a posture at an address in a golf swing is set as an initial position. An inertial sensor,
Using the output of the inertial sensor, a calculation unit that calculates a rotation angle that occurs around the detection axis of the inertial sensor with a swing;
A display unit for displaying the marking based on the rotation angle obtained by the calculation unit;
With
The motion analysis system is characterized in that the marking displays a change in angle from the initial position of the swing in a cubic shape whose direction changes according to the change in the rotation angle calculated by the calculation unit. Computer
Using the output of the inertial sensor, calculating a rotation angle generated around the detection axis of the inertial sensor with a swing;
Displaying a marking based on the calculated rotation angle;
Carried out
The motion analysis method, wherein the marking displays a change in angle from an initial position of the swing in a cubic shape whose direction changes in accordance with the change in the rotation angle.

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