| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a golf club head from which a ball-hitting sound comfortable for a golfer is obtained. <P>SOLUTION: A frequency F1 showing the maximum sound pressure level of the ball-hitting sound ranges 7,000 to 9,000 (Hz), and a frequency F2 at a primary vibration mode is not smaller than 5,000 (Hz). <P>COPYRIGHT: (C)2004,JPO</p> |
