| 摘要 |
A surface is comparted into eight spherical regular triangles (T1 to T8) through twelve comparting lines formed by projecting, onto the surface, twelve sides of a regular octahedron inscribed on the surface. Dimples are arranged in the spherical regular triangles (T1 to T8) so as not to intersect any of the comparting lines. Consequently, three great circle paths (L1), (L2) and (L3) are formed. Each of four spherical regular triangles sharing each of six apexes (P1 to P6) has different dimple pattern from those of three other spherical regular triangles, respectively. In the golf ball, it is possible to prevent dimple effects from being reduced when one of the three great circle paths (L1), (L2) and (L3) is coincident with the highest speed portion. |
