摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a golf club head and a golf club which can acquire a relatively stable yardage regardless of the condition that a golf ball is placed eventually by effectively removing foreign matters such as moisture, grass or soil unavoidably interposed between the golf ball and the face plane in hitting the ball. <P>SOLUTION: The golf club has the first group of grooves which has a plurality of the first grooves having a depth of 200-600μm and a width of 250-1,000μm in the face plane built at a prescribed loft and the second group of grooves which has a plurality of the second grooves a depth of 5-50μm and a width of 5-100μm in the face plane. The overall length of the first grooves is 250-1,200 mm and that of the second grooves 100-1,200 mm. The angleαbetween the first grooves and the horizontal virtual line is 45°-90°, the angleγbetween the first and second grooves is 30°-90°and the angleβbetween the second grooves and the horizontal virtual line is 0°-60°. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |