Swing measurement method, golf swing analysis method, and computer program product
First Claim
1. A swing measurement method for measuring a swing behavior during a swing with an impact implement grasped on a grip portion thereof, comprising the steps of:
- fixing a three dimensional magnetic sensor to the grip portion of the impact implement;
forming magnetic fields, each distribution of intensity and direction thereof being known, within a range of motion of the grip portion, so that the three dimensional magnetic sensor senses magnetism of each of the formed magnetic fields for outputting signals corresponding to three dimensional position of the grip portion with respect to a predetermined point, and to pointing direction of the grip portion with respect to a predetermined direction; and
acquiring at least one of three dimensional position coordinates data of the grip portion and pointing direction data of the grip portion from the output signals, wherein;
the impact implement is a golf club; and
the three dimensional position coordinates data and the pointing direction data, are acquired during the swing of the golf club; and
further wherein;
the three dimensional magnetic sensor fixed to the grip portion has three mutually orthogonal axes for sensing;
one direction of an axis from among the three mutually orthogonal axes being aligned with a direction of an axis of a shaft of the golf club; and
one direction of an axis from among the other two axes being aligned with an impact direction of the golf club.
1 Assignment
0 Petitions
Accused Products
Abstract
A swing measurement method of directly measuring a swing behavior without being influenced by flexure of an impact implement, such as a golf club or baseball bat is provided. In addition, a golf swing analysis method and computer program product having computer program code for a simple and effective model of the behavior of a grip portion during a golf swing is provided. A three dimensional magnetic sensor capable of measuring position and direction is fixed to a grip portion of the impact implement within magnetic fields in which the magnetic field distribution of intensity and direction are known, and the behavior of the swing is directly measured. In addition, the path of the grip portion is approximated as an arc within a swing plane using the three dimensional position coordinates of the grip portion obtained in this measurement, and thus an arm angle, a wrist angle, and an angle of shaft rotation are found. The time sequence data of the wrist angle and the time sequence data of the shaft rotation angle, with respect to the time sequence data of the arm angle are plotted and the swing behavior is analyzed.
78 Citations
16 Claims
-
1. A swing measurement method for measuring a swing behavior during a swing with an impact implement grasped on a grip portion thereof, comprising the steps of:
-
fixing a three dimensional magnetic sensor to the grip portion of the impact implement;
forming magnetic fields, each distribution of intensity and direction thereof being known, within a range of motion of the grip portion, so that the three dimensional magnetic sensor senses magnetism of each of the formed magnetic fields for outputting signals corresponding to three dimensional position of the grip portion with respect to a predetermined point, and to pointing direction of the grip portion with respect to a predetermined direction; and
acquiring at least one of three dimensional position coordinates data of the grip portion and pointing direction data of the grip portion from the output signals, wherein;
the impact implement is a golf club; and
the three dimensional position coordinates data and the pointing direction data, are acquired during the swing of the golf club; and
further wherein;
the three dimensional magnetic sensor fixed to the grip portion has three mutually orthogonal axes for sensing;
one direction of an axis from among the three mutually orthogonal axes being aligned with a direction of an axis of a shaft of the golf club; and
one direction of an axis from among the other two axes being aligned with an impact direction of the golf club. - View Dependent Claims (2, 3)
-
-
4. A golf swing analysis method for analyzing a swing behavior of a golf club, comprising the steps of:
-
receiving time sequence data of three dimensional position coordinates of a grip portion of the golf club, and time sequence data of pointing direction of the grip portion during a golf swing from a data acquisition means;
calculating a swing plane, on which a swing path of the grip portion is approximated, from the time sequence data of the three dimensional position coordinates;
projecting the swing path of the grip portion on the swing plane and approximating the projected swing path as an arc to obtain the arc as a swing path arc of the grip portion; and
obtaining;
arm angle time sequence data of an arm angle showing a position of the grip portion on the swing plane from the time sequence data of three dimensional position coordinates and the swing path arc; and
at least one time sequence data from the group consisting of;
wrist angle time sequence data of a wrist angle found based on a shaft direction angle obtained from the pointing direction of the grip portion and showing a shaft direction of the golf club on the swing plane, and rotation angle time sequence data of a shaft rotation angle, around a shaft axis of the golf club, from the pointing direction. - View Dependent Claims (5, 6, 7, 8, 9, 10)
the data acquisition means, which has a three dimensional magnetic sensor and a means for forming magnetic fields, each distribution of intensity and direction thereof being known, so that the three dimensional magnetic sensor corresponding to three dimensional position of the three dimensional magnetic sensor with respect to a predetermined point, and to pointing direction of the three dimensional magnetic sensor with respect to a predetermined direction, acquires the time sequence data of the three dimensional position coordinates and the time sequence data of the pointing direction, by fixing the three dimensional magnetic sensor to the grip portion and forming the magnetic fields within a range of motion of the grip portion during the golf swing.
-
-
11. A computer program product, comprising a computer readable medium having computer program code embodied for an analysis of swing behavior of a golf club,
the computer program code including: -
computer program code configured to cause a computer to receive time sequence data of three dimensional position coordinates of a grip portion of the golf club and time sequence data of pointing direction of the grip portion during a golf swing from a data acquisition means;
computer program code configured to cause a computer to compute a swing plane, on which a swing path of the grip portion is approximated, from the time sequence data of the three dimensional position coordinates;
computer program code configured to cause a computer to project the swing path of the grip portion on the swing plane and approximate the projected swing path as an arc to obtain the arc as a swing path arc of the grip portion; and
computer program code configured to cause a computer to obtain;
arm angle time sequence data of an arm angle showing a position of the grip portion on the swing plane from the time sequence data of the three dimensional position data and the swing path arc; and
at least one time sequence data from the group consisting of;
wrist angle time sequence data of an wrist angle found based on a shaft direction angle obtained from the time sequence data of the pointing direction and showing a shaft direction of the golf club on the swing plane, and rotation angle time sequence data of a shaft rotation angle, around a shaft axis of the golf club, from the pointing direction. - View Dependent Claims (12, 13, 14, 15, 16)
-
Specification