Abstract: Provided is a golf ball having an improved structure of a plurality of circular dimples formed on a surface of the golf ball to improve flight stability and increase a flying distance. With a golf ball having a plurality of circular dimples on a surface thereof, a plurality of concaves, each of which has a shape of an arc concentric with the circular dimple, are formed at a predetermined interval along a circumference of the entire or a portion of the circular dimple.

Abstract: Disclosed are manufacturing of a golf ball. A golf ball has a plurality of circular dimples in its spherical outer surface, dividing into the faces of a spherical polyhedron by a plurality of division lines, wherein border lines are formed at the position of ±1˜2 latitudinal degrees to the division lines, the circular dimples are arranged by using the border lines as an occupation limit line of the circular dimples positioned opposite to the division lines, and the golf ball has no dimple on the pole in the center of the spherical polyhedron is provided, thereby increasing the performance such as a carry distance by raising the proper amount of area ratio of dimples, obtaining the uniformity thickness cover molding without the inferior product due to the balanced gates with uniform size.

Abstract: Disclosed is a golf ball including a center portion, at least two intermediate tiers sequentially surrounding the center portion, and an outer tier surrounding the intermediate tiers, which comprises: said outer tier having a thickness in a range of 0.8˜1.4 mm, and an a hardness (Shore D) in a range of 40˜50; among the intermediate tiers, said first intermediate tier formed just below the outer tier, having a thickness in a range of 1.0˜2.0 mm and a hardness (Shore D) in a range of 50˜65; each intermediate tier formed just below the first intermediate tier having a thickness in a range of 1.3˜1.5 mm, and a hardness (Shore D) in range of 30˜70; the radius of the center portion is in a range of 5˜18 mm, and a hardness (Shore D) in a range of 30˜70; and a moment of inertia value of the golf ball is less than 83 g·cm2. According to the golf ball of the present invention, an iron spin force is excellent as compared to a conventional golf ball for a match, and the flying distance is almost same.

Abstract: Provided is a golf ball with a transparent cover made of ionomer resin containing 0.02% or less of a pigment or a dyestuff. The surface of the cover of the golf ball is processed using a corona discharge process at a voltage of 90,000V and then together with wedge type grinding media in a revolving hexagonal drum type surface treatment machine to induce microscopic indentations and scratches on the surface of the cover. An anchor coated layer is formed on the surface of the cover using acrylic resin or urethane resin, and a top coated layer is formed on the anchor coated layer using urethane resin. The surface of the golf ball has a number of specula surfaces and thus can induce diffused reflections of light. Therefore, the golf ball appears in dual color due to the color of its core and the color of shadows of dimples.

Abstract: Provided is a golf ball having a plurality of dimples that are arranged symmetrically even in a polygon of the polyhedron made by a new divided method of the spherical outer surface of the golf ball. The golf ball has an aerodynamic stability, so the landing point is stable and uniform and the carry distance has increased.