| 摘要 |
<p>PROBLEM TO BE SOLVED: To make it possible to obtain a golf club head which is extremely less in the loss which occurs at the time of impact than a soft elastic material, such as rubber, and is high in the initial speed at the time of hitting the ball by using a rock crystal on the impact face of the golf club hard. SOLUTION: The entire part of the golf hard is produced by using metals, such as mild iron, stainless steel or titanium, or an alloy beryllium copper or iron and nickel, or carbon fibers, etc., and is finished as a rigid body of mainly a metallic lump or carbon fiber lump. The head is connected to a shaft via neck part existing alongside a heel part. The rock crystal 5 is fixed to the impact face 2 of the golf club hard. As a result, the impact face is functioned as a piezoelectric vibrator so that the head exhibiting the loss of, for example, 1/1000 to 1/10000 in the coefft. of mechanical quality (loss), smaller by about, for example, 100 to 1000 times than the conventional heads is obtd.</p> |
