Importance

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Abstract

A golf ball has a plurality of dimples in its spherical outer surface and its spherical outer surface is divided into the faces of an icosahedron consisting of 20 regular spherical triangles, and the golf ball's spherical outer surface is further divided by great circle paths which obtained by extending spherical straight lines connecting the midpoint of each side of the sperical triangles of icosahedron to its opposite apex, then large spherical pentagons will be created on the polar regions of the golf ball's spherical outer surface. The center of large pentagon as a pole, which is a common apex of 5 regular spherical triangles of the spherical icosahedron, from the pole, spherical straight lines extend along the both sides of each of the 5 spherical triangles to the equator. (Same thing happens on the opposite pole.) The spherical outer surface is further divided by the spherical straight lines into small sections to arrange the dimples. Regarding to the dimples, arrange the largest circular dimples on the central region of each spherical triangle and also on each apex of the spherical triangles of the spherical icosahedron, and arrange the annular dimples which have the same center as the largest circular dimples on each apex of the spherical triangles, outside of them. In accordance with the dimple arrangement of the present invention, the drag coefficient of a golf ball in a low-speed area has reduced and the carry distance has increased. In addition, the center of each annular dimple will act as an authentic axis of rotation when the annular dimple becomes at a right angle with the direction of air stream and so keep the ball's rotation longer, that secure the flying stability and a longer carry distance.

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First Claim