Patent ID: 7162913

Claim:
A method of evaluating restitution characteristics of a golf club head, comprising: preparing a linear regression formula expressing a relationship between resonant frequencies of striking faces of a plurality of samples of golf club heads and coefficients of restitution of the striking faces of the golf club heads of the respective samples; imparting an external impact force to a striking face of a golf club head to be evaluated at which a golf ball is hit to cause the striking face to vibrate; acquiring a response signal of the striking face which vibrates by the impact force imparted thereto to obtain a resonant frequency of the striking face from the acquired response signal; and calculating a coefficient of restitution of the golf club head from the obtained resonant frequency on the basis of the linear regression formula to evaluate a restitution of the golf club head, the restitution occurring when a golf ball is struck by the striking face, wherein the linear regression formula is prepared before the resonant frequency of the striking face of the golf club head to be evaluated is obtained.