| 摘要 |
In a tennis racket whose frame and handle shaft are integrally made of fiber reinforced plastics and the frame defines a strung surface, the frame is so designed that its first thickness "t" in a direction of the strung surface is substantially uniform around the circumference of the frame and its second thickness "T" in a direction perpendicular to the strung surface is gradually varied. The second thickness is maximum at side sections of the frame interposing a sweet spot in the strung surface and is minimum at the top and bottom portions of the frame in such a manner that the maximum thickness is thicker in the range from 35% to 60% than the minimum thickness, which increases a weight per unit length of the frame toward the side sections.
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