| 摘要 |
PROBLEM TO BE SOLVED: To improve the repulsion elasticity of a racket frame and to realize weight-saving, without lowering the operability and durability of the racket frame. SOLUTION: Assuming that a ball hitting area F in a head part 3 of the racket frame 2 is the face of a watch, then a top position is 12 o' clock. The ratio (B/A) of the weight A per unit length of the head part 3 of the racket frame 2 from 12 o' clock to 1 o' clock (12-11 o' clock) to the weight B per unit length of the head part 3 from 3 o'clock to 5 o' clock (9-7 o' clock) is 1.2 to 2.0, while the distance between a balance point G (center of gravity) and a hitting center COP (point on a hitting area where no strong reaction or shock is generated on a player's hand when an impact is imparted to a ball by the hitting area) is set to be less than 145 mm. |
