| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a driver club head which can increase the probability for a so-called nice shot while ensuring the strength in the actual usage. SOLUTION: This driver club head made of a metal has a hollow structure as a whole. For such a driver club head, a disk-shape impact section at the central section, an annular concave section on the outer periphery of the disk- shape impact section in a manner to be adjacent to the disk-shape impact section, and a peripheral edge section on the outer periphery of the annular concave section in a manner to be adjacent to the annular concave section are integrally formed, when being seen from the internal surface in either case. At the same time, a specified thickness distribution is applied to them to form the face surface.</p> |
