| 摘要 |
A gold club in which the repulsion area of the face portion is shifted downward, and a manufacturing method of such a golf club are provided. The structure of the golf club is such that, in order to shift the sweet area of a face portion having a striking face downward, a crown portion is subjected to an age hardening process to intentionally enhance any one or more of the mechanical qualities of material of the rigidity, strength and hardness of the crown portion. By shifting the sweet area downward, eventually a repulsion effect in the shifted position can be improved, and a ball can be struck without causing a decrease in a traveling distance as in the case when striking the ball on the upper position, even if the striking position is the position shifted to the lower part of the face portion.
|
