To provide a golf ball with two or more kinds of many dimples, different in diameter and/or depth, arranged on the surface, the Eastdev value of which in the following equation is 2 or under.
Equation 1 (In the above equation, N is the total number of the dimples, subscripts i and j are ID numbers for the dimples, EA is an aerodynamic index of the dimple arrangement around the rotation axis specified in the parenthesis, α is a rotation axis of a golf ball determined by the straight line between the center of the dimple identified by a subscript and the center of gravity of the golf ball, θ is an angle between the straight line between the center of the dimple identified by a subscript and the center of gravity of the golf ball and the rotation axis α of the golf ball and S is a plane area formed by the edge of the dimple identified by a subscript). In the above structure the dimples can be arranged in a good symmetry and the golf ball can exercise a stable flying performance regardless of its hitting points.
| JPS56130168 | BOWL FOR BOWLING |
| JP2680405 | [Title of Invention] Large size three-piece solid golf ball |
| JP6406834 | Golf ball |
IHARA KEISUKE
KASASHIMA ATSUNORI
