| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a designing method of a golf ball which has very soft hitting feeling, excels in durability and can increase carry with low spin, high starting flight angle and high repulsion. <P>SOLUTION: The core has a JIS-C center hardness of 50-70, a JIS-C surface hardness of 60-80 and a diameter of 35-40 mm, the intermediate layer is made of an ionomer resin as a main material, has a JIS-C hardness of 70-85, a thickness of 0.5-2 mm, the cover is made of an ionomer resin as a main material, has a JIS-C hardness of 85 or more, a thickness of 0.5-2 mm, then, the intermediate layer is harder than the core surface by 9 or less in terms of the JIS-C hardness, the cover is harder than the intermediate layer by 10 or more in terms of the JIS-C hardness, the gradient of the hardness of the core, the intermediate layer and the cover is 6 or more, and the dimples are arranged so that no great circle line not intersecting with the dimples is present at all in the golf ball. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
