Abstract: A golf ball has a large number of dimples 10 on a surface thereof. The dimples 10 include a plurality of small dimples 10S each having an area of less than 8.0 mm2, and a plurality of large dimples 10L each having an area of equal to or greater than 8.0 mm2. A ratio PS of a sum of areas of all the small dimples 10S to a surface area of a phantom sphere of the golf ball is less than 2.0%. A ratio PL of a sum of areas of all the large dimples 10L to the surface area of the phantom sphere is equal to or greater than 79.0%. A degree G of uniformity of areas of the large dimples 10L is equal to or less than 1.15.

Abstract: Disclosed is a golf ball in which a plurality of dimples is arranged. The golf ball includes first dimples having the largest diameter and second dimples having the second largest diameter arranged on the surface of the golf ball divided into a spherical rhombic dodecahedron, the first dimples are arranged in an LF region of a radius of ?/10 radian±10% around a first apex of the spherical rhombic dodecahedron, shared jointly by 4 spherical rhomi, and the second dimples are arranged in an LS region of a radius of ?/20 radian±10% around a second apex of the spherical rhombic dodecahedron, shared jointly by 3 spherical rhombi. Thereby, air flow and pressure drag are uniformized in all of spherical polygons and thus, a carry distance of the golf ball may be improved.

Abstract: A designing method according to the present invention includes the steps of: (1) dividing a surface of a phantom sphere of a golf ball 2 into a plurality of units U by division lines 14 obtained by projecting edge lines of a regular polyhedron inscribed in the phantom sphere, on the surface of the phantom sphere; (2) obtaining a base pattern by randomly arranging a plurality of dimples 8 in one unit U such that the dimples 8 do not overlap each other; and (3) developing the base pattern over other units U such that patterns of two adjacent units U are not mirror-symmetrical to each other. The regular polyhedron is preferably a regular dodecahedron or a regular icosahedrons.

Abstract: Non-circular dimples such as oval form dimples are provided on the spherical surface of a ball body. A golf ball includes a spherical land surface of the ball body and a dimple pattern of a plurality of dimples formed on the spherical land surface, the spherical surface of the ball body being divided into a plurality of spherical surface parts (land surfaces) with each polygon faces of polyhedron which is virtually inscribed in said spherical surface of ball body, by a projection method from each polygon faces of the inscribed polyhedron, on each spherical surface parts some or all of the dimples being formed as non-circular dimple having a width of more than 1.5 mm and a length of more than 2 times of the width and the dimple pattern is disposed so as to make vortices generated in the non-circular dimples flow out in at least two different directions.

Abstract: The present invention provides a method for arranging dimples on a golf ball surface that significantly improves aerodynamic symmetry and minimizes parting line visibility by arranging the dimples in a pattern derived from at least one irregular domain generated from a regular or non-regular polyhedron. One or more irregular domains may have an initial dimple sub-pattern of nearest neighbor dimples wherein the dimple sub-pattern is packed in one or more irregular domains; and the unfilled regions of the irregular domains are packed with dimples and the irregular domains are tessellated around the golf ball surface.

Abstract: The present invention is directed to a golf ball comprising of non-concentric arcs defining a non-planar parting line on its spherical surface resulting in having a large size disparity between dimples in one hemisphere and adjacent dimples from the opposing hemisphere. The parting line is produced by a pair of adjacent dimples, wherein D indicates dimples and N indicates dimples from the Northern hemisphere and those from the Southern hemisphere are indicated by S. A large disparity may be created, if the following condition is satisfied: D ? ( N ) D ? ( S ) > 1.25 ? ? or ? ? D ? ( N ) D ? ( S ) < 0.80 .

Abstract: A golf ball has a plurality of dimples, wherein: (1) the dimples have a peripheral edge with a radius of curvature R from 0.5 mm to 2.5 mm; (2) the surface coverage SR of the dimples, expressed as a percentage of the surface area of a hypothetical sphere representing the ball if it had no dimples, is from 60% to 74%; and (3) the ratio ER of a collective number of dimples RA having a radius of curvature R to diameter D ratio (R/D) of at least 20%, divided by a total number of dimples N on the surface of the ball, is from 15% to 95%. This combination of features enables damage to the paint film on the surface of the ball to be minimized, improves the durability of markings on the surface of the ball, and prevents a decline in ball performance.

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.

Abstract: A designing method according to the present invention includes the steps of: (1) dividing a surface of a phantom sphere of a golf ball 2 into a plurality of units U by division lines 14 obtained by projecting edge lines of a regular polyhedron inscribed in the phantom sphere, on the surface of the phantom sphere; (2) obtaining a base pattern by randomly arranging a plurality of dimples 8 in one unit U such that the dimples 8 do not overlap each other; and (3) developing the base pattern over other units U such that patterns of two adjacent units U are not mirror-symmetrical to each other. The regular polyhedron is preferably a regular dodecahedron or a regular icosahedrons.

Abstract: A golf ball having a plurality of dimples formed on its outer surface, the outer surface of the golf ball being divided into plural areas, a first group of areas containing a plurality of first dimples and a second group of areas containing a plurality of second dimples, each area of the second group abutting one or more areas of the first group, the first and second groups of areas and dimple shapes and dimensions being configured such that the golf ball is spherically symmetrical as defined by the United States Golf Association (USGA) Symmetry Rules, the plural areas configured such that the golf ball has a Drag Coefficient (CD) and a Lift Coefficient (CL) of less than about 0.330 and 0.270, respectively, at a Reynolds Number (Re) of about 80,000 and a spin rate of between about 2,900 rpm and about 3,000 rpm and a CD and CL of less than about 0.260 and 0.

Abstract: A golf ball mold having a non-planar parting surface formed by superimposing a base waveform with a least one shorter secondary waveform. The base waveform is defined by a series of concentric arcs wherein adjacent arcs are connected with a straight line segment that is tangent to the arcs and creates an acute angle. The length of the straight line segment being critical to the accuracy and predictability of the parting line.

Abstract: A golf ball is disclosed having a plurality of dimples on its surface, the dimples being arranged in patterns determined by the science of phyllotaxis. Phyllotactic patterns are used to ascertain the placement of dimples in each polygonal face of a polyhedron based dimple pattern. Phyllotactic patterns provide for the arrangement of multiple spiral shaped strings of dimples within individual polygonal faces of a golf ball surface, with each polygonal face area having its own phyllotactic origination point at its center. The resulting multiple axes of symmetry in the overall dimple pattern provide improved symmetry of flight performance.

Abstract: A resin composition comprising, in admixture, (A) a specific thermoplastic resin component, (B) at least one wax component selected from among (b-1) a fatty acid having 20-80 carbon atoms and/or a derivative thereof and (b-2) an oxidized natural wax and/or derivative having a neutralization value of 60-190 mg KOH/g, and optionally, (C) a basic inorganic metal compound capable of neutralizing acid groups in the thermoplastic resin component (A) and/or the wax component (B) is improved in flow, moldability and heat resistance and thus suitable to form a layer of a golf ball which exhibits improved rebound and distance properties.

Abstract: The golf ball comprises all known cores provided with a cover produced by a polymer blend that combines the durability of a conventional cover with the feel of a traditional balata cover having a plurality of dimples in a modified dodecahedron pattern. The dodecahedron consists of twelve pentagons, which are subdivided into a total of sixty triangles. The triangles are then further subdivided into rows into which various diameter dimples are placed. The dimple pattern can be arranged to produce a pattern of ten great circles, which are free of dimples. The cover formulation is a blend of various ethylene/methacrylic acid copolymers wherein at least one copolymer has a high modulus and at least one copolymer has a moderate modulus forming a miscible blend having a PDI index that maximizes durability while still maintaining feel and playability.

Abstract: Golf balls are disclosed having novel dimple patterns determined by a pentagonal hexecontahedron. A method of packing dimples according to a pentagonal hexecontahedron is also disclosed. For each disclosed dimple pattern, a pentagonal hexecontahedron extend from a pole of the golf ball and dimples are positioned on the golf ball surface according to a pentagonal hexecontahedron.

Abstract: An ionomer resin component containing (a) a ternary ionomer resin and optionally (b) a binary ionomer resin, optionally blended with (c) a non-neutralized olefin-unsaturated carboxylic acid random copolymer, is blended with (d) a metal soap of a fatty acid neutralized with a Ca, Mg or Zn cation in a weight ratio from 95:5 to 80:20. A golf ball cover composition based on this mixture has a melt index of 1-10 dg/sec. The cover composition is drastically improved in moldability, resilience and paint coating adhesion. A golf ball having a cover made of the composition is improved in feel and flight performance.

Abstract: A golf ball has plural types of dimples on a spherical surface, which is assumed to be a regular icosahedron having twenty triangles. Apexes of five triangles join together at a vertex. Those dimples arranged in each triangle constitute an arrangement unit. A first dimple having a smallest diameter is located at the vertex, and second dimples having a greater diameter are equidistantly arranged around the first dimple. When a pentagon which circumscribes the second dimples is drawn, an average depth of those dimples located within the pentagon is up to 85% of the average depth of those dimples located in the remaining areas.

Abstract: A spherical ball and a method of making the spherical ball wherein the ball has a plurality of elongated dimples substantially covering the outer surface of the ball without any dimple overlap. The elongated dimples are of at least two types including a first plurality of dimples having a minor axis and a major axis which together form the long axis of the first plurality of dimples. The minor axis being less than the major axis. A second plurality of dimples has a minor axis equal to that of the first plurality of dimples and a major axis less than the major axis of the first plurality of dimples but greater than the minor axis.

Abstract: A golf ball is molded in a mold comprising a pair of removably joined mold sections. The golf ball has a plurality of dimples, the dimples being arranged in a polyhedral arrangement. The golf ball is free of a great circle which does not intersect with the dimples. The dimples (D2) lying across the parting line (P) between the mold sections, except for the dimples (D1) whose center lies on the parting line, are shifted upward or downward from the parting line or reduced in diameter so that these dimples are located outside the parting line (P). The dimple surface coverage is at least 71%. A golf ball having high symmetry and excellent flight performance can be prepared using a simple mold.

Abstract: A golf ball having a plurality of dimples on its spherical surface molded by a mold which has a spherical cavity therein and is composed of a pair of mold sections being removably mated along with a parting surface at the position corresponding to an equator line of the spherical cavity of the mold, wherein at least one dimple lies across the equator line of the ball, such that a center of the dimple is displaced from the equator line, and the dimple is formed by a pin disposed at the parting surface of the mold sections such that a center axis passing the axial center of the pin is positioned below or above the parting line.

Abstract: A golf ball includes a substantially spherical surface containing a plurality of dimples of differing diameter. Twelve spherical regular pentagons and twenty spherical regular triangles are arranged on the spherical surface in a manner corresponding to a dodecaicosahedron (12-20 hedron). Each pentagon shares a same asymmetrical dimple pattern such that each of five sides of each pentagon have a dimple pattern that differs from a dimple pattern on four other sides, and all of the pentagons share the same five differing side patterns. Six great circle paths are arranged about the spherical surface, each great circle path being bounded on one side by a series of five adjacent pentagons, one of which is a reference pentagon, and the other four of which are respectively and angularly displaced at angles of 72.degree., 288.degree., 144.degree. and 216.degree. with respect to the reference pentagon. A sequence of angular pentagon displacement of the series is consistent along all six great circle paths.