Golf ball

Abstract

Disclosed herein is a golf ball which has not only an air resistance similar to or smaller than that of a dimpled golf ball, but also a significantly reduced area ratio of grooves relative to the total surface area of the golf ball, thereby achieving an enhanced carry distance and high accuracy in the directionality of putting. The golf ball has net-shaped grooves formed on an outer surface of a sphere.

1 . A golf ball wherein net-shaped grooves are formed on an outer surface of a sphere, and the net-shaped grooves are connected to or separated from one another. 
     
     
         2 . The golf ball according to  claim 1 , wherein the area of the grooves is 14 to 69% of the total surface area of the golf ball. 
     
     
         3 . The golf ball according to  claim 2 , wherein each groove has a width below 4 mm and a depth of 0.1 to 0.4 mm. 
     
     
         4 . The golf ball according to  claim 2 , wherein each groove has a width of 1 to 5 mm and a depth of 0.1 to 0.5 mm, and the groove is formed with a protrusion merely having a height smaller than the depth of the groove, and the protrusion is connected to or separated from other protrusions. 
     
     
         5 . The golf ball according to  claim 1 , wherein the sphere has a divisional composition of a spherical regular polyhedron, and each groove is formed along a circular path drawn by connecting specific points on the surface of the sphere, each specific point being determined such that an included angle between a straight line connecting one of vertexes of spherical regular polygons constituting the spherical regular polyhedron to a center of the sphere and a straight line connecting the specific point to the center of the sphere has a predetermined value. 
     
     
         6 . The golf ball according to  claim 5 , wherein the spherical regular polyhedron is a spherical regular hexahedron or regular icosahedron, and the included angle is 45 to 80 degrees. 
     
     
         7 . The golf ball according to  claim 1 , wherein the sphere has a divisional composition of a spherical regular polyhedron, and each groove is formed along a circular path drawn by connecting specific points on the surface of the sphere, each specific point being determined such that an included angle between a straight line connecting one of centers of gravity of spherical regular polygons constituting the spherical regular polyhedron to a center of the sphere and a straight line connecting the specific point to the center of the sphere has a predetermined value. 
     
     
         8 . The golf ball according to  claim 7 , wherein the spherical regular polyhedron is a spherical regular octahedron or regular dodecahedron, and the included angle is 45 to 80 degrees. 
     
     
         9 . The golf ball according to  claim 1 , wherein the sphere has a divisional composition of a spherical polyhedron, and the grooves are formed along edges of the spherical polyhedron. 
     
     
         10 . The golf ball according to  claim 9 , wherein the spherical polyhedron is a spherical regular icosahedron, or a spherical icosahedron consisting of eight spherical regular pentagons and twelve spherical regular hexagons.