| 摘要 |
When hitting a ball to a target with a putter, the ball tends to deviate to the right. The reason of this is as follows. When eye lines follow the target, in order to move both eye lines, the head is inevitably turned toward the target direction. In this case, although the turning axis is different depending on a player's posture, the turning axis is supposed to be the nape at the back of the head or a line extended to the spine from the nape. An illusion occurs when the turning axis is not horizontal and when both eye lines toward the target is not orthogonal to the turning axis. Under these conditions, a trajectory along which the eye lines follows on the lawn does not become a line but an elliptic curve. It is an illusion that the player himself/herself determines this as following on the line. A conventional putter is based on a two-dimensional putter theory, whereas, by embedding a planar pendulum into a putter head, the invented putter is based on a three-dimensional putter theory including elements consisting of both eye lines, a ball, and a target point. |
