| 摘要 |
<P>PROBLEM TO BE SOLVED: To realize a hitting point with no impact and no vibration and prevent adverse effect on the human body by matching a hitting central position with a node position of two-node bending vibration in the string face or a racket where the hitting central position is not matched with the node position of a two-node bending vibration and either an impact or a vibration is generated in hitting, thereby producing uncomfortable ball hitting feeling by the impact and vibration and affecting the adverse effect on the body. <P>SOLUTION: A specific amount of weight is disposed at a grip end lower end portion or a racket head tip potion to move the hitting central position and the node position of the two-node bending vibration on the string face of the racket and match them at the same position, thus achieving the hitting point without impact or without vibration. <P>COPYRIGHT: (C)2009,JPO&INPIT |
