Golf ball dimple shape
The present invention is directed to golf balls having improved aesthetics and desirable aerodynamic properties due, at least in part, to the novel shape of the dimples on the surface thereof. In particular, the present invention is directed to a golf ball that includes at least a portion of its dimples having a shape obtained from the intersection of a prismatic polyhedron and the golf ball outer surface. The resulting curve of intersection represents the dimple perimeter and the intersecting portion of the surface of the prismatic polyhedron represents the dimple surface shape.
1. A golf ball having a generally spherical surface and comprising a plurality of dimples on the spherical surface, including at least one dimple having:
a dimple perimeter defined by a curve of intersection resulting from the intersection of a prism with the spherical surface of the golf ball; and
a surface shape defined by the portion of the prismatic outer surface that intersects with the spherical surface of the golf ball;
wherein the prismatic outer surface includes two parallel and congruent n-sided polygonal bases and at least three side faces, wherein each side face is adjacent to two other side faces and is adjoined to one side of each polygonal base; and
wherein the portion of the prismatic outer surface that intersects with the spherical surface of the golf ball includes at least two adjacent side faces and does not include any portion of the polygonal bases.
2. The golf ball of claim 1 , wherein the dimple perimeter is not axially symmetric when viewed in the direction normal to an axis connecting the center of the ball to the centroid of the dimple.
3. The golf ball of claim 1 , wherein the prism is a regular prism.
4. The golf ball of claim 1 , wherein the prism is an irregular prism.
5. The golf ball of claim 1 , wherein the prism is a right prism.
6. The golf ball of claim 1 , wherein the prism is an oblique prism.
7. The golf ball of claim 1 , wherein each of the two polygonal bases has ten or fewer sides.
8. The golf ball of claim 1 , wherein the at least one dimple has a surface depth SD of no greater than 0.020 inches.
9. The golf ball of claim 1 , wherein a distance L E between two points at which the prism and the sphere intersect is from 0.050 inches to 0.400 inches.
10. The golf ball of claim 1 , wherein each dimple of the portion has a plan shape area within a range having a lower limit of about 0.002 in. 2 and an upper limit of about 0.045 in. 2 ; and a dimple surface volume within a range having a lower limit of about 0.1 ×10−4 in. 3 and an upper limit of about 4.3 ×10−4 in. 3 .
11. The golf ball of claim 10 , wherein each dimple of the portion has a plan shape area within a range having a lower limit of from about 0.006 in. 2 and an upper limit of about 0.032 in. 2 ; and a dimple surface volume within a range having a lower limit of about 0.2 ×10−4 in. 3 and an upper limit of about 2.1 ×10−4 in. 3 .