Motion analyzing apparatus, motion analyzing method, and motion analyzing program

Abstract

When a sporting tool or a subject changes from a first state (e.g., address state) to a second state (during swing), a detection part detects, within a plane orthogonal to a first direction (y-axis) in which a shaft part of the sporting tool extends, a rotation angle θxn or θzn at which the sporting tool or the subject changes around an axis in a second direction or a third direction orthogonal to each other (x-axis or z-axis) using output of an inertial sensor.

What is claimed is: 
     
         1 . A motion analyzing apparatus comprising an arithmetic processing circuit that calculates, within a plane orthogonal to a first direction in which a shaft part of a sporting tool extends, a rotation angle of the shaft part changing around an axis in at least one of a second direction and a third direction orthogonal to each other based on an inertial force generated when a first state of the sporting tool changes to a second state by swing motion of the sporting tool. 
     
     
         2 . The motion analyzing apparatus according to  claim 1 , wherein the first state is a state before start of the swing motion and the second state is a dynamic state of the swing motion. 
     
     
         3 . The motion analyzing apparatus according to  claim 1 , wherein the second direction is along a rotation axis at pronation or supination of a wrist of the subject holding a grip part of the sporting tool. 
     
     
         4 . The motion analyzing apparatus according to  claim 1 , wherein the third direction is along a rotation axis at ulnar flexion or radial flexion of a wrist of the subject holding a grip part of the sporting tool. 
     
     
         5 . The motion analyzing apparatus according to  claim 1 , wherein the arithmetic processing circuit calculates a relative value of the rotation angle changing around the axis in the first direction between the first state and the second state. 
     
     
         6 . The motion analyzing apparatus according to  claim 1 , wherein information of the rotation angle is output. 
     
     
         7 . The motion analyzing apparatus according to  claim 1 , wherein a change of the rotation angle is output in response to a time during swing motion of the sporting tool. 
     
     
         8 . The motion analyzing apparatus according to  claim 6 , wherein the information of the rotation angle is output with information of another rotation angle for comparison. 
     
     
         9 . The motion analyzing apparatus according to  claim 1 , further comprising an event detection part that specifies an event during swing motion based on the inertial force,
 wherein information of the rotation angle is correlated with the event.   
     
     
         10 . The motion analyzing apparatus according to  claim 9 , wherein the event and the information of the rotation angle are output. 
     
     
         11 . The motion analyzing apparatus according to  claim 9 , wherein the event is output with information of another rotation angle for comparison. 
     
     
         12 . A motion analyzing method comprising calculating, within a plane orthogonal to a first direction in which a shaft part of a sporting tool extends, a rotation angle of the shaft part changing around an axis in at least one of a second direction and a third direction orthogonal to each other based on an inertial force generated when a first state of the sporting tool changes to a second state by swing motion of the sporting tool. 
     
     
         13 . A non-transitory computer-readable medium storing a motion analyzing program causing a computer to execute:
 a procedure of calculating, within a plane orthogonal to a first direction in which a shaft part of a sporting tool extends, a rotation angle of the shaft part changing around an axis in at least one of a second direction and a third direction orthogonal to each other based on an inertial force generated when a first state of the sporting tool changes to a second state by swing motion of the sporting tool.   
     
     
         14 . A motion analyzing apparatus for analyzing motion of a sporting tool, comprising:
 an inertial sensor including an arithmetic processing circuit that calculates, within a plane orthogonal to a first direction in which a shaft part of the sporting tool extends, a first rotation angle of the shaft part changing around an axis in a second direction orthogonal to the first direction, and calculating a second rotation angle of the shaft part changing around an axis in a third direction orthogonal to the first direction and to the second direction based on an inertial force generated when a first state of the sporting tool changes to a second state by swing motion of the sporting tool.   
     
     
         15 . The motion analyzing apparatus according to  claim 14 , wherein the first state is a state before start of the swing motion and the second state is a dynamic state of the swing motion. 
     
     
         16 . The motion analyzing apparatus according to  claim 14 , wherein the second direction is along a rotation axis at pronation or supination of a wrist of the subject holding a grip part of the sporting tool. 
     
     
         17 . The motion analyzing apparatus according to  claim 14 , wherein the third direction is along a rotation axis at ulnar flexion or radial flexion of a wrist of the subject holding a grip part of the sporting tool. 
     
     
         18 . The motion analyzing apparatus according to  claim 14 , further comprising a display device configured to display the first rotation angle and the second rotation angle in association with a time of the swing motion of the sporting tool.