Patent ID: 7520824
Filing Date: 2009-04-21
Classification: A63B

Abstract:
1. A golf ball comprising: a multiplicity of dimples on a spherical surface of said golf ball; wherein any great circle line not crossing any one of said dimples is not present on the spherical surface of said golf ball; said dimples crossing an equator of said golf ball as a great circle line partially cross the equator and the number of said partially crossing dimples is in a range of 4 to 32; and given that longitude lines extending from each of both poles of said golf ball to the equator are taken as virtual circular-arcs, said dimples are not linear-symmetric with respect to each of said circular-arcs; wherein said dimples including said dimples crossing the equator are rotation-symmetric of a specific angle of 360° /n (n:natural number) about a rotational axis which connects both of the poles of said golf ball to each other while passing through a center of an equatorial plane of said golf ball, wherein a phase of a dimple arrangement on a southern hemisphere of the golf ball is not shifted in a latitudinal direction from a phase of a dimple arrangement on a northern hemisphere of the golf ball, wherein said dimples crossing the equator of said golf ball cross the equator in a range of 10 to 50% of a diameter of said dimples; wherein a dimple total volume is a range of 280 to 350 mm wherein a ratio of a total area occupied by the dimples to an entire surface area of a spherical surface of a virtual ball which is the same as the golf ball except that any dimple is not present on the surface of the virtual ball, is in the range of 78.0 to 85%; and wherein a volume of each of the dimples crossing the equator or near the equator is larger than that of other dimples by 2 to 30%.