| 摘要 |
<p>PROBLEM TO BE SOLVED: To drive a ball high, suppress the unnecessary back spin, provide an ideal ballistic never blown up, and consequently extend the flying distance by providing such a structure as the loft angle of a face plane is largely changed in driving. SOLUTION: A club head body 1 is constituted so that the rigidity of the back side 3 is minimized, whereby the vertical rigidity of a face plane 2 can be minimized. Namely, as the means for minimizing the rigidity of the back side of the club head body 1, a notch part 5 substantially parallel to a sole part 4 is formed in the substantially central position of the height H of the club head body 1 and on the back part 3 of the club head, extending from the toe side 1x to the heel side 1y. Such a notch part 5 is integrally formed in the manufacture of the club head body 1 or formed after the shell of the club head body 1 is formed.</p> |
