Golf ball having surface divided by line segments of great circles and small circles

Abstract

A surface of a sphere is divided by using not only great circles but also small circles, forming a spherical polyhedron. The spherical polyhedron includes two spherical regular pentagons, each having a center at the pole, ten spherical isosceles triangles near the pole, ten spherical pentagons near the equator, and ten other spherical isosceles triangles near the equator. Compared to a related art, dimples are accurately arranged in spherical polygons. Thus, a dimple area ratio is improved and the number of dimples is appropriately maintained.

What is claimed is: 
     
         1 . A golf ball having a surface, wherein:
 dimples are arranged on the surface of the golf ball,   a spherical regular pentagon centered on a pole of the golf ball is defined only by line segments of great circles,   the surface is divided by an equator of the golf ball, the equator being defined by one of the great circles, and combined line segments, each of the combined line segments being defined by connecting three line segments including a line segment of a small circle, a line segment of the great circle, and another line segment of the small circle, which are a line segment of the great circle defining each of sides of the spherical regular pentagon and line segments of the small circle near the equator, into two near-pole spherical regular pentagons, ten near-pole spherical isosceles triangles, ten near-equator spherical pentagons, and ten near-equator spherical isosceles triangles.   
     
     
         2 . The golf ball of  claim 1 , wherein the combined line segments dividing the surface of the golf ball, except for the great circle defining the equator, comprise:
 a parting line defined by a line segment belonging to a small circle and connecting Point  1  (latitude 0° and longitude 0°), Point  11  (latitude 39° and longitude 18°), and Point  16  (latitude 61.4° and longitude 54°), a line segment belonging to a great circle and connecting Point  16  (latitude 61.4° and longitude 54°), Point  22  (latitude 66.19818538° and longitude 90°), and Point  17  (latitude 61.4° and longitude 126°), and a line segment belonging to a small circle and connecting Point  17  (latitude 61.4° and longitude 126°), Point  13  (latitude 39° and longitude 162°), and Point  6  (latitude 0° and longitude 180°);   a parting line obtained by combining a line segment belonging to a small circle and connecting Point  2  (latitude 0° and longitude 36°), Point  11  (latitude 39° and longitude 18°), and Point  20  (latitude 61.4° and longitude 342°), a line segment belonging to a great circle and connecting Point  20  (latitude 61.4° and longitude 342°), Point  25  (latitude 66.19818538° and longitude 306°), and Point  19  (latitude 61.4° and longitude 270°), and a line segment belonging to a small circle and connecting Point  19  (latitude 61.4° and longitude 270°), Point  14  (latitude 39° and longitude 234°), and Point  7  (latitude 0° and longitude 216°);   a parting line obtained by combining a line segment belonging to a small circle and connecting Point  3  (latitude 0° and longitude 72°), Point  12  (latitude 39° and longitude 90°), and Point  17  (latitude 61.4° and longitude 126°), a line segment belonging to a great circle and connecting Point  17  (latitude 61.4° and longitude 126°), Point  23  (latitude 66.19818538° and longitude 162°), and Point  18  (latitude 61.4° and longitude 198°), and a line segment belonging to a small circle and connecting Point  18  (latitude 61.4° and longitude 198°), Point  14  (latitude 39° and longitude 234°), and Point  8  (latitude 0° and longitude 252°);   a parting line obtained by combining a line segment belonging to a small circle and connecting Point  4  (latitude 0° and longitude 108°), Point  12  (latitude 39° and longitude 90°), and Point  16  (latitude 61.4° and longitude 54°), a line segment belonging to a great circle and connecting Point  16  (latitude 61.4° and longitude 54°), Point  21  (latitude 66.19818538° and longitude 18°), and Point  20  (latitude 61.4° and longitude 342°), and a line segment belonging to a small circle and connecting Point  20  (latitude 61.4° and longitude 342°), Point  15  (latitude 39° and longitude 306°), and Point  9  (latitude 0° and longitude 288°); and   a parting line obtained by combining a line segment belonging to a small circle and connecting Point  5  (latitude 0° and longitude 144°), Point  13  (latitude 39° and longitude 162°), and Point  18  (latitude 61.4° and longitude 198°), a line segment belonging to a great circle and connecting Point  18  (latitude 61.4° and longitude 198°), Point  24  (latitude 66.19818538° and longitude 234°), and Point  19  (latitude 61.4° and longitude 270°), and a line segment belonging to a small circle and connecting Point  19  (latitude 61.4° and longitude 270°), Point  15  (latitude 39° and longitude 306°), and Point  10  (latitude 0° and longitude 324°).   
     
     
         3 . The golf ball of  claim 1 , wherein the dimples comprise one or more circular dimples. 
     
     
         4 . The golf ball of  claim 1 , wherein the dimples comprise one or more polygonal dimples. 
     
     
         5 . The golf ball of  claim 3 , wherein the dimples have about two to eight dimple sizes. 
     
     
         6 . The golf ball of  claim 4 , wherein the dimples have about two to eight dimple sizes. 
     
     
         7 . A golf ball having a surface, wherein:
 the golf ball is symmetrical with respect to an equator, and the equator is divided into ten equal parts based on ten reference points,   a spherical regular pentagon centered on a pole of the golf ball is defined by five great circles passing through two reference points which are included among the ten reference points and are located opposite to each other,   a small circle passing through a reference point included among the ten reference points and a vertex of the spherical regular pentagon is defined, and a line segment of the small circle between the reference point and the vertex of the spherical regular pentagon is defined to be a small circle parting line segment,   five spherical triangles surrounding and contacting the spherical regular pentagon, five spherical triangles sharing a vertex with the five spherical triangles and contacting the equator, and five spherical pentagons located in a space between the ten spherical triangles and contacting the equator are formed based on a hemisphere, and   the surface is divided into a plurality of spherical polygons including the spherical regular pentagon, the five spherical triangles surrounding and contacting the spherical regular pentagon, the five spherical triangles surrounding and contacting the equator, and the five spherical pentagons, and dimples are arranged in the plurality of spherical polygons formed on the surface of the golf ball.   
     
     
         8 . The golf ball of  claim 7 , wherein the combined line segments dividing the surface of the golf ball, except for the great circle defining the equator, comprise:
 a parting line obtained by combining three line segments of a small circle line segment connecting Point  1  (latitude 0° and longitude 0°), Point  11  (latitude 39° and longitude 18°), and Point  16  (latitude 61.4° and longitude 54°), a great circle line segment connecting Point  16  (latitude 61.4° and longitude 54°), Point  22  (latitude 66.19818538° and longitude 90°), and Point  17  (latitude 61.4° and longitude 126°), and a small circle line segment connecting Point  17  (latitude 61.4° and longitude 126°), Point  13  (latitude 39° and longitude 162°), and Point  6  (latitude 0° and longitude 180°);   a parting line obtained by combining three line segments of a small circle line segment connecting Point  2  (latitude 0° and longitude 36°), Point  11  (latitude 39° and longitude 18°), and Point  20  (latitude 61.4° and longitude 342°), a great circle line segment connecting Point  20  (latitude 61.4° and longitude 342°), Point  25  (latitude 66.19818538° and longitude 306°), and Point  19  (latitude 61.4° and longitude 270°), and a small circle line segment connecting Point  19  (latitude 61.4° and longitude 270°), Point  14  (latitude 39° and longitude 234°), and Point  7  (latitude 0° and longitude 216°);   a parting line obtained by combining three line segments of a small circle line segment connecting Point  3  (latitude 0° and longitude 72°), Point  12  (latitude 39° and longitude 90°), and Point  17  (latitude 61.4° and longitude 126°), a great circle line segment connecting Point  17  (latitude 61.4° and longitude 126°), Point  23  (latitude 66.19818538° and longitude 162°), and Point  18  (latitude 61.4° and longitude 198°), and a small circle line segment connecting Point  18  (latitude 61.4° and longitude 198°), Point  14  (latitude 39° and longitude 234°), and Point  8  (latitude 0° and longitude 252°);   a parting line obtained by combining three line segments of a small circle line segment connecting Point  4  (latitude 0° and longitude 108°), Point  12  (latitude 39° and longitude 90°), and Point  16  (latitude 61.4° and longitude 54°), a great circle line segment connecting Point  16  (latitude 61.4° and longitude 54°), Point  21  (latitude 66.19818538° and longitude 18°), and Point  20  (latitude 61.4° and longitude 342°), and a small circle line segment connecting Point  20  (latitude 61.4° and longitude 342°), Point  15  (latitude 39° and longitude 306°), and Point  9  (latitude 0° and longitude 288°); and   a parting line obtained by combining three line segments of a small circle line segment connecting Point  5  (latitude 0° and longitude 144°), Point  13  (latitude 39° and longitude 162°), and Point  18  (latitude 61.4° and longitude 198°), a great circle line segment connecting Point  18  (latitude 61.4° and longitude 198°), Point  24  (latitude 66.19818538° and longitude 234°), and Point  19  (latitude 61.4° and longitude 270°), and a small circle line segment connecting Point  19  (latitude 61.4° and longitude 270°), Point  15  (latitude 39° and longitude 306°), and Point  10  (latitude 0° and longitude 324°).   
     
     
         9 . The golf ball of  claim 7 , wherein the dimples comprise one or more circular dimples. 
     
     
         10 . The golf ball of  claim 7 , wherein the dimples comprise one or more polygonal dimples. 
     
     
         11 . The golf ball of  claim 9 , wherein the dimples have about two to eight dimple sizes. 
     
     
         12 . The golf ball of  claim 10 , wherein the dimples have about two to eight dimple sizes.