| 摘要 |
PROBLEM TO BE SOLVED: To eliminate shortcomings such that for a force applied to a racket frame at the time of a ball-hitting, a force wherein forces in the in-plane direction and the inplane direction of the ball-hitting surface are synthesized is applied, and conventionally, various kinds of methods are applied for the bending vibration by the force in the in-plane direction, but a method to solve the problem of the in-plane vibration by the force in the in-plane direction has not been developed. SOLUTION: At areas equivalent to nodes A and B of the in-plane vibration of this racket frame 1, at least one mass body 5 is fitted on or incorporated into the constituent member 1b which constitutes the racket frame 1, and thus, the in-plane vibration is reduced. |
