Tennis racket with longitudinal strings different in tensile force from transversal strings.

摘要

A tennis racket has longitudinal strings (G1') stretched in a longitudinal direction between a frame top and a grid end and transversal strings (G2') stretched in a transversal direction perpendicular to the longitudinal direction, and a ratio of a tensile force exerted on each longitudinal string to a tensile force exerted on each transversal string ranges from 2.5 : 1 to 4.0 : 1 so that a nodal line (ND2') for vibrations in the secondary mode passes through a sweet area, thereby decreasing a reaction from the tennis racket at an impact against a tennis ball.