| 摘要 |
A tennis racket frame having the head and shaft, preferably made of a hollow FRP material, have uniform thickness along the longitudinal direction of the racket frame in a range from 23 to 28 mm with a natural frequency in a range from 160 to 260 Hz. Raised product of the Young's modulus (E) and moment of inertia of area (I) of the racket frame much improves its repulsion characteristics for long distance shot accurately in an intended direction. The specified natural frequency makes the vibrately performance of the racket frame very close to that of balls just after striking so that the vibration energy of the racket frame should be efficiently utilized for acceleration of balls. Further, the increased thickness of the head end assures raised accuracy in striking even when a ball is struck by a section of the face near the head end.
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