Abstract: A golf ball dimple pattern based on a hexagonal dipyramid polyhedron is disclosed. Preferably, the dimple pattern disclosed by the present invention includes dimples that are arranged such that at least a portion of neighboring dimples have one or more predetermined diameter ratios. The dimples are arranged based on six substantially similar mating dimple sections on each hemisphere. Each of the six substantially similar mating dimple sections on each hemisphere share a dimple positioned at the pole of that hemisphere. The dimple pattern is capable of achieving a surface coverage of about 82% or greater.

Abstract: A golf ball (20) having a low volume cover layer (14) is disclosed herein. The golf ball (20) has a cover layer (14) with a volume less than 0.1550 cubic inches. In a preferred embodiment, the cover layer (14) is composed of a reaction-injection molded polyurethane material. Preferably, the cover layer (14) has a plurality of deep depressions (99) with either a plurality of multi-faceted polygons (44) or dimples.

Abstract: A golf ball comprising a core and a cover layer, wherein the cover layer provides one or more deep depressions that extend through the cover layer to and/or into a layer or component underneath is disclosed. The cover may be a single layer or it may include multiple layers. If the cover is a multi-layer cover, the deep depressions extend to or into at least the first inner cover layer, and may extend to and/or into two or more inner cover layers. If the cover is a single layer, the deep depressions extend to and/or into the core. The cover layer(s) may be formed from any material suitable for use as a cover, including, but not limited to, ionomers, non-ionomers and blends of ionomers and non-ionomers. The deep depressions may be spherical or non-spherical, and the portion of the deep depression that extends to or into the next inner layer may be the same or different shape as the outer portion of the deep depression.

Abstract: The present invention relates to dimples and dimple patterns for golf balls (20), preferably dimple patterns composed of letters, symbols, logos and combinations thereof, inset into the cover of the golf ball (20). The golf ball (20) has dimples (40) and logo depressions (50) in a cover of the golf ball (20). The logo depressions (50) are preferably letters, symbols, logos and combinations thereof, inset into the cover of the golf ball (20).

Abstract: A two-piece golf ball having a reaction injection molded polyurethane cover is disclosed herein. The golf ball has a core with a diameter preferably ranging from 1.610 inches to 1.670 inches, and a cover having a thickness preferably ranging from 0.015 inch to 0.045 inch. The cover also preferably has a plurality of deep apertures extending through the cover.

Abstract: A golf ball including a core and a cover layer, wherein the golf ball has a lift to weight ratio greater than about 1.7 at a Reynolds number of about 207,000 and a non-dimensional spin ratio of about 0.095, a COR of 0.790 or less, and a weight of about 1.39 to 1.62 oz; and wherein the cover layer has an outer surface including dimples covering 55% to 75% of the outer surface.

Abstract: The present invention relates to a mold having a parting line along dimples which allows manufacturing of golf balls free from burrs, and to golf balls manufactured using such a mold. The mold of the present invention is provided with a spherical cavity inside thereof; and an upper mold and a lower mold separable from each other, wherein a plurality of convex portions for forming dimples is provided in the inner surface of the cavity, at least one of the plurality of convex portions lies over the equator of the cavity, a parting line, which corresponds to the boundary between the upper mold and the lower mold, extends along the inner surface of the cavity, the parting line comprises first lines extending along the peripheries of the convex portions lying over the equator and second lines connecting the first lines, and the first line is disposed apart from the periphery by a distance of 0.1 to 0.5 mm.

Abstract: A golf ball having an improved surface pattern is disclosed. The golf ball has one or more channels or ridges on its surface. These ridges or channels may decrease drag, or may increase lift, and may increase or decrease flight symmetry. These channels or ridges may be linear, or may be curved, and may or may not fully circumscribe the golf ball. These channels or ridges may also be combined with traditional or non-traditional dimples.

Abstract: In a golf ball, a plurality of flat surface regions, typically hexagonal plane regions are defined on the ball surface. The proportion of the land area in the golf ball surface area is reduced to below 20%, eventually reducing the air resistance of the ball in flight and drastically improving the flight performance.

Abstract: A golf ball having a plurality of dimples on its surface, the dimples as a whole are distributed on at least a portion of the golf ball based on Soddy circles. The portion of the golf ball may be triangulated, and Soddy circles may be generated based on the vertices of each triangle. Dimples may then be arranged according to the generated Soddy circles. Alternately, dimples within the portion of the golf ball may be distributed based on circle packing.

Abstract: A golf ball comprising a core and a cover layer, wherein the cover layer provides one or more deep dimples having two or more different radii is disclosed. The deep dimples(s) extend(s) through the cover layer to and/or into a layer or component underneath. The cover may be a single layer or it may include multiple layers. The deep dual dimples may be spherical or non-spherical, and the portion of the dimple that extends to or into the next inner layer may be the same or different shape as the outer portion of the dimple.

Abstract: A golf ball is provided that has improved aerodynamic efficiency, resulting in increased flight distance for golfers of all swing speeds, and more particularly for golfers possessing very high swing speeds, such as those who can launch the balls at an initial speed greater than 160 miles per hour and more particularly at initial ball speed of about 170 miles per hour or higher. The golf ball of the present invention combines lower dimple count with multiple dimple sizes to provide higher dimple coverage and improved aerodynamic characteristics.

Abstract: A golf ball (20) having a plurality of primary dimples (50) with annular tubular portion (60) is disclosed herein. In a preferred embodiment, there are 332 primary dimples which cover a surface area ranging from 81% to 87% of the golf ball (20). Also in a preferred embodiment, there are twenty different types of primary dimples (50), which vary in diameter, chord depth and/or entry angle.

Abstract: The invention provides a multi-piece solid golf ball comprising a core, an envelope layer encasing the core, an intermediate layer encasing the envelope layer, and a cover which encases the intermediate layer and has formed on a surface thereof a plurality of dimples. The core is formed primarily of a rubber material, has a diameter of at least 31 mm, and has a hardness which gradually increases from a center to a surface thereof, the hardness difference in JIS-C hardness units between the core center and the core surface being at least 15 and, letting (I) be the average value for cross-sectional hardnesses at a position 15 mm from the core center and at the core center and letting (II) be the cross-sectional hardness at a position 7.5 mm from the core center, the hardness difference (I)-(II) therebetween in JIS-C units being not more than ±2. The envelope layer and the intermediate layer are each formed primarily of the same or different resin materials.

Abstract: The invention provides a golf ball composed of a core, a cover, and an intermediate layer between the core and the cover, which ball has a surface with a plurality of non-circular dimples thereon. The cover is harder than the intermediate layer. The ball surface has land areas with intervals therebetween of from 0.05 to 1.0 mm, the lands having outer surfaces that define an outermost peripheral face of the ball. The non-circular dimples have non-circular inside corners that are curved. The ball satisfies conditions (I) to (IV) below: (I) (core initial velocity)?(ball initial velocity)?0; (II) 0.87?(deflection of intermediate layer-covered sphere)/(core deflection)?0.97; (III) combined thickness of intermediate layer and cover?3.0 mm; and (IV) (ball deflection)/(deflection of intermediate layer-covered sphere)?0.98. The golf ball of the invention has an increased distance and a stable flight performance.

Abstract: A golf ball includes an outer spherical surface and a plurality of dimples formed thereon. In accordance to one aspect of the invention, the dimples in accordance to the invention have a polygonal perimeter and a substantially spherical, concave depression. The substantially spherical depression comprises a spherical depression and a transitional portion bridging the area between the polygonal perimeter and the spherical depression. In accordance to another aspect of the invention, one or more sides of the polygonal perimeter may be non-linear or curved. The dimples of the present invention may fill the ball's entire outer surface, or the dimples may occupy a predetermined pattern on the ball. The predetermined pattern may also include one or more channels or raised beads on the surface of the ball.

Abstract: In a golf ball having, on a spherical surface, numerous dimples in a plurality of types of differing diameter, the dimples include smallest size dimples having a diameter of 2.7 mm or less and largest size dimples having a diameter of 4.3 mm or less. At least 50% of the total number of dimples are dimples in which an arc that connects mutually opposing positions on a wall of the dimple at a 70% dimple depth level with a deepest position on the dimple wall has a radius of curvature R of at least 15 mm.

Abstract: A golf ball (20) having a low volume cover layer (14) is disclosed herein. The golf ball (20) has a cover layer (14) with a volume less than 0.1550 cubic inches. In a preferred embodiment, the cover layer (14) is composed of a reaction-injection molded polyurethane material. Preferably, the cover layer (14) has a plurality of deep depressions (99) with either a plurality of multi-faceted polygons (44) or dimples.

Abstract: A golf ball includes a spherical outer surface and a plurality of dimples formed thereon. The dimples have an inner land surface with at least one spiral depression either disposed or superimposed on the inner land surface to energize or agitate the airflow over the dimpled surfaces to increase the aerodynamic performance of the golf ball. The spiral depression may turn clockwise or counterclockwise and can be either spaced apart, touching or overlapping each other. While the dimples may be circular, polygonal, triangular or elliptical, dimples having a cross section greater than 0.18 inch are preferred. The dimples may also comprise spiral depressions directly on the spherical surface of the ball.

Abstract: A golf ball that is formed by a mold developed from a computerized modeling system such as CAD or CAE in combination with a CNC machine tool which superimposes a short waveform, or multiple waveforms, onto a longer base waveform to create a non-planar parting line that is functionally dependent on the underlying dimple geometry. The non-planar parting line is comprised of a plurality of peaks and valleys that are offset from the dimple perimeters, as not to bisect any dimple edge. Also, dimples on one side of the parting line interdigitate with dimples on the other side to form a more uniform distribution of dimples over the entire golf ball surface. Still further, the non-planar parting line has a amplitude which is less than 0.02 inch from an axis substantially coincident with the equator of the ball and the length of the parting line is less than 110 percent of the length of a curve defined by the circumference of the equator.

Abstract: A golf ball having an improved dimple pattern is disclosed. The dimples may have a regular or irregular polygonal perimeter, an undimpled land surface and a depression therein. The perimeter may alternatively comprise a number of linear sides and at least one curved side. At least a portion of the bottom of the depression is convex such that its curvature is substantially identical to the curvature of the land surface making the depth of that portion constant along its surface relative to the land surface. The depression may further comprise a sub-depression. Alternatively, the depression may further comprise a projection. Additionally, the depression may have a polygonal or circular perimeter.

Abstract: A golf ball having an outside surface with a plurality of dimples formed thereon. The dimples on the ball have a cross-sectional profiles formed by a catenary curve. Combinations of varying dimple diameters, shape factors, and chordal depths in the catenary curve are used to vary the ball flight performance according to ball spin characteristics, player swing speed, as well as satisfy specific aerodynamic magnitude and direction criteria.

Abstract: The invention provides a golf ball composed of a core, an intermediate layer which encases the core, and a cover which encases the intermediate layer. The core has a diameter of 36 to 40 mm and a deflection of 3.5 to 4.2 mm, and the intermediate layer has a Shore D hardness of 45 to 55 and a thickness of 0.6 to 1.6 mm. The cover has a Shore D hardness of 63 to 66 and a thickness of 0.6 to 1.6. The ball as a whole has a deflection of 2.6 to 3.5 mm, and the intermediate layer and cover have a combined thickness of 1.8 to 2.8 mm. The ball has a hardness design such that the Shore D hardnesses of the ball components satisfy the relationship core center?core surface?intermediate layer?cover, and the cover is made of a material composed primarily of a thermoplastic resin or a thermoplastic elastomer. The intermediate layer is made of a material that is a resin composition in which at least 90 mol % of the acid groups are neutralized.

Abstract: An improved mold for making a golf ball comprises a pair of mold cups which are assembled together at an angular interlock. An upper mold cup has a projection rim that mates with a recess in the lower mold cup to provide for a substantially perfect registration, wherein the shift on the molded golf ball is minimized, and the parting line has a minimal amount of flashing that needs to be removed. The upper and lower mold cups have mating surfaces that can produce a corrugated parting line. Each mating surface comprising a plurality of peaks and valleys which are created by multiple radii, whereby when assembled the parting line follows the dimple outline pattern and allows the dimple outline pattern of one mold cup to interdigitate with the dimple outline pattern of the mating mold cup, to form a golf ball of substantially seamless appearance.

Abstract: A golf ball with multi-lobed dimples is provided. The dimple comprises a plurality of lobes positioned radially around the center of the dimple, wherein each lobe is defined by a circumferential segment. Each lobe comprises a first curved profile extending from the circumferential segment toward the center of the dimple and the first curved profile of each lobe abuts each other in an uninterrupted manner. The curvature of the circumferential segments can be defined by a ratio of an inside radius to an outside radius.

Abstract: A golf ball (20) having a low volume cover layer (14) is disclosed herein. The golf ball (20) has a cover layer (14) with a volume less than 0.1550 cubic inches. In a preferred embodiment, the cover layer (14) is composed of a reaction-injection molded polyurethane material. Preferably, the cover layer (14) has a plurality of deep depressions (99) with either a plurality of multi-faceted polygons (44) or dimples.

Abstract: A golf ball (20) approaching zero land area is disclosed herein. The golf ball (20) has an innersphere with a plurality of primary lattice members (40) and a plurality of sub-lattice members (41). Each of the plurality of primary lattice members (40) has an apex and the golf ball (20) of the present invention conforms with the 1.68 inches requirement for USGA-approved golf balls. The interconnected primary lattice members (40) and plurality of sub-lattice members (41) preferably form a plurality of dual polygons, preferably dual hexagons and dual pentagons.

Abstract: A golf ball is provided with a dimple pattern comprising two substantially identical elongated dimple pattern elements which fit together to form the complete dimple pattern. The dimple pattern can contain 344 dimples covering about 70.4% of the golf ball surface or 392 dimples covering about 73.3%, or other combinations of dimple count and coverage. The sizes of the dimples can be varied among either four distinct dimple sizes ranging from about 0.14 inches to about 0.17 inches or eight distinct dimple sizes ranging from about 0.11 inches to about 0.175 inches, or other dimple size combinations. The arrangement of dimples on the golf ball can be divided into a plurality of triangles having identical dimple arrangements with bilateral symmetry.

Abstract: The invention provides a golf ball that is molded using a golf ball mold composed of a pair of mold halves, each having a hemispherical cavity, which when separably mated form an interior spherical cavity, the golf ball comprising a surface that includes an equator located at a place which corresponds to the parting line of the mold and a pole located at each of two vertices on either side of the equator, wherein the ball has on the surface thereof one or more dimple that lies across the equator and additionally has, at and near the poles, dimples some or all of which are formed to either a shallower depth or a smaller volume than dimples of the same diameter in other regions. The invention enables golf balls having numerous dimples formed thereon to be efficiently produced with a split mold. The golf balls thus obtained have a high symmetry performance.

Abstract: A golf ball with aerodynamic coefficient magnitude and aerodynamic force angle, resulting in improved flight performance, such as increased carry and flight consistency regardless of ball orientation. In particular, the present invention is directed to a golf ball having increased flight distance as defined by a set of aerodynamic requirements at certain spin ratios and Reynolds Numbers, and more particularly the golf ball has a low lift coefficient at a high Reynolds Number.

Abstract: The invention provides a golf ball with a ball surface having a plurality of non-circular dimples thereon, wherein mutually neighboring dimples have contour lines therebetween which are arranged so as to be substantially parallel and are separated by an interval of 0.05 to 1.0 mm, land areas defined by the substantially parallel contour lines have an outer surface which forms the outermost peripheral face of the ball, and the non-circular dimples have a non-circular shape with inside angles that are curved. This arrangement endows the ball with a distinctive, aesthetically pleasing appearance on account of the dimple pattern composed largely of non-circular dimples. Moreover, even though numerous non-circular dimples are arranged on the surface of the ball, the high surface coverage and air resistance-lowering effect enable the distance traveled by the ball to be increased.

Abstract: Golf ball 2 has a core 4, a cover 6 and numerous dimples 8. The cover 6 has a thickness of less than 3.0 mm and a hardness H4 of equal to or greater than 90. A difference (H2?H1) of a surface hardness H2 of the core 4 and a central hardness H1 of the core 4 is 10 or greater and 25 or less. A difference (H4?H1) of the hardness H4 of the cover 6 and a surface hardness H1 of the core 4 is equal to or greater than 25. A difference (H4?H2) of the hardness H4 of the cover 6 and a surface hardness H2 of the core 4 is 10 or greater and 20 or less. Provided that mean diameter of all the dimples 8 is Da, a ratio (N1/N) of number N1 of adjacent dimple pairs having a pitch of (Da/4) or less to total number N of the dimples 8 is equal to or greater than 2.70. A ratio (N2/N1) of number N2 of adjacent dimple pairs having a pitch of (Da/20) or less to the number N1 is equal to or greater than 0.50.

Abstract: Golf ball 2 has dimples A having a diameter of 5.15 mm, dimples B having a diameter of 5.00 mm, dimples C having a diameter of 4.60 mm, dimples D having a diameter of 4.50 mm, dimples E having a diameter of 4.20 mm, dimples F having a diameter of 4.10 mm, dimples G having a diameter of 3.90 mm and dimples H having a diameter of 3.00 mm. Mean value of the diameter of all the dimples 8 is equal to or greater than 4.00 mm. Standard deviation ? of the diameter of all the dimples 8 is 0.52 or greater and 0.72 or less. Occupation ratio of total area of the dimples in the surface area of the phantom sphere is equal to or greater than 75%.

Abstract: In a golf ball composed of a resilient solid core and a resin cover which encloses the core and has on an outside surface thereof numerous circular dimples, the cover has a maximum thickness of 0.5 to 1.5 mm and is made of a polyurethane elastomer having a Shore D hardness of 40 to 58; the total number of dimples on the cover is from 390 to 420, of which 40 to 80 are small-diameter dimples with a diameter of 2.0 to 2.7 mm; and the dimples are arranged so that total planar surfaces circumscribed by dimple edges which delineate boundaries between individual dimples and surrounding land areas that form an outermost surface of the ball account for 74 to 84% to an imaginary sphere defined by the surface of the ball having no dimples thereon. The golf ball of the invention does not readily lose lift even near the highest point in the trajectory of the ball when it has been hit, and thus can beneficially increase the distance of travel.

Abstract: Golf ball 2 has a center 8, mid layer 10 and a cover 6. The mid layer 10 is formed by a resin composition containing a metal oxide with a three-dimensional shape. A D hardness of the mid layer 10 is 32 or greater and 39 or less. A ratio of an amount of compressive deformation C1 of the center 8 to an amount of compressive deformation C2 of a core 4, (C1/C2), is less than 1.09. A ratio of the amount of compressive deformation C1 to an amount of compressive deformation C3, (C1/C3), is equal to or greater than 1.08. This golf ball has three or more kinds of dimples 12, each having a different diameter. Total number of the dimples 12 is equal to or greater than 300. A ratio Pn of the number of the dimples 12 with a diameter of equal to or greater than 3.40 mm to the total number of the dimples is equal to or greater than 90%. The number of kinds of the dimples having a diameter of equal to or greater than 3.40 mm in a low latitude region is greater than that in a middle region and a high latitude region.

Abstract: A golf ball (20) having a non-planar parting line (25), a first false non-planar parting line (26a) and a second false non-planar parting line (26b). A first group 32 of parting dimples defines the non-planar parting line (25). A second group (33) of parting dimples defines the first false non-planar parting line (26a). A third group (34) of parting dimples defines the second false non-planar parting line (26b). A plurality of hexispheres (70) are defined by the non-planar parting line (25) the first false non-planar parting line (26a) and the second false non-planar parting line (26b).

Abstract: The present invention provides a dimple structure for golf balls. In the present invention, a plurality of dimples (50a) each having a predetermined shape is disposed on an outer surface of a golf ball in a predetermined arrangement. The dimple structure of the present invention includes at least one protrusion (60a) which is integrally provided in the dimple (50a), thus increasing the contact area between the golf ball and the head of a golf club, and increasing resilient force of the golf ball against the golf club head, thereby increasing the distance that the golf ball is driven. As well, the present invention increases the amount of backspin on the golf ball when an approach shot is executed near the putting green, thus allowing the rolling action of the golf ball on the putting green to be easily controlled.

Abstract: This invention provides a multi-piece golf ball composed of a core, an intermediate layer enclosing the core, and a cover layer which encloses the intermediate layer and has on an outside surface thereof a plurality of dimples. The cover layer is harder than the intermediate layer. Letting A be the thickness of the intermediate layer, B be the thickness of the cover layer and C be the diameter of the core, 65?C/A?30 and 65?C/B?30. In addition, a specific gravity of the core ranges from 1.0 to 1.2, a specific gravity of the intermediate layer ranges from 0.88 to 1.00, and the ball has an initial velocity, as measured by a method set forth in the Rules of Golf using an initial velocity measuring apparatus of the same type as the USGA drum rotation-type initial velocity instrument, of at least 77.0 m/s.

Abstract: A golf ball has a spherical surface bearing a plurality of plan view circular dimples and plan view non-circular dimples, which non-circular dimples have at a top edge position a contour length of at least 20 mm and account for at most 10% of all the dimples. The ball has a surface with a novel and unique aesthetic appearance, and exhibits an excellent flight performance.

Abstract: A golf ball with multi-lobed dimples is provided. The dimple comprises a plurality of lobes positioned radially around the center of the dimple, wherein each lobe is defined by a circumferential segment. Each lobe comprises a first curved profile extending from the circumferential segment toward the center of the dimple and the first curved profile of each lobe abuts each other in an uninterrupted manner. The curvature of the circumferential segments can be defined by a ratio of an inside radius to an outside radius.

Abstract: A golf ball has a plurality of linearly or curvilinearly extending ridge-like lands on its spherical surface. The percent occupation of the total of land areas relative to the overall area of a phantom spherical surface assumed at the level of the top of lands can be reduced to substantially zero.

Abstract: A golf ball has a plurality of polygonal dimples, each with an interior wall that includes areas formed by a plurality of flat surfaces. The ball retains a good carry without a decline in flight performance. In addition, the many novel and distinctive dimples formed on the surface of the ball cause it to glitter from the irregular reflection of light by the dimples, imparting to the ball an attractive appearance that makes it highly desirable to the consumer.

Abstract: Golf ball has dimples 8. The dimple 8 has a first curved face S1, a second curved face S2, a third curved face S3, a first edge E1, a second edge E2 and a third edge E3. The second edge E2 and the third edge E3 are disposed concentrically with the first edge E1. The first curved face S1 is ring-shaped. The first curved face S1 is inclined downward from the first edge E1 toward the center of the dimple 8. The second curved face S2 is ring-shaped. The second curved face S2 is inclined upward from the second edge E2 toward the center of the dimple 8. The third curved face S3 is bowl-shaped. The third curved face S3 is inclined downward from the third edge E3 toward the center of the dimple 8. The air that flows toward the center of the dimple 8 collides with the third edge E3. Due to this collision, the air flow is disrupted.

Abstract: A golf ball with a dimple pattern designed to maximize flight characteristics employs dimples which are created by joining two or more intersecting surfaces. The invention provides for single radius or dual radius dimples, preferably including smaller radius cylinders tangentially arranged along the side of the larger cylinders. The intersection of the cylinders forms tri-cylinders, tri-semicylinders, bi-cylinders, quad-semicylinders, penta-semicylinders, or more generally n-cylinders depending upon the number of intersecting cylinders. The golf ball includes a plurality of single or dual radius dimples created by intersecting n-cylinders to create maximum turbulence on the ball during flight.

Abstract: A golf ball conforming a core, a cover and numerous dimples formed on the surface of the cover. The thickness of the cover is equal to or less than 1.4 mm. The Shore D hardness of the cover is equal to or less than 53. The dimple 4 has an inclined face, a circular flat face, an annular groove and a round flat face. The surface area s1 is calculated by summing up the surface area of the inclined face, the surface area of the circular flat face, the surface area of the annular groove and the surface area of the round flat face 9. The ratio (S1/S2) between a summation S1 of surface areas s1 of all the dimples, and a summation S2 of the areas s2 of the regions cut away by the dimples on the phantom spherical face, is equal to or greater than 1.03. The difference (Cc?Cb) between the amount of compressive deformation Cb of the golf ball and the amount of compressive deformation Cc of the core is equal to or less than 0.20 mm. The amount of compressive deformation Cc of the core is equal to or less than 3.00 mm.

Abstract: A golf ball comprising a core and a cover layer, wherein the cover layer provides one or more deep dimples having two or more different radii is disclosed. The deep dimples(s) extend(s) through the cover layer to and/or into a layer or component underneath. The cover may be a single layer or it may include multiple layers. The deep dual dimples may be spherical or non-spherical, and the portion of the dimple that extends to or into the next inner layer may be the same or different shape as the outer portion of the dimple.

Abstract: Golf ball 2 has three or more different kinds of dimples 8. The total number of the dimples 8 is 300 or more. A ratio Pn of the number of the dimples 8 with a diameter of equal to or greater than 3.40 mm to the total number is equal to or greater than 90%. The golf ball 2 meet the following formulae (I) and (II). NL?NH?0 ??(I) NL>NHm?NHp ??(II) NL represents the number of kinds of the dimples being located in a low latitude region ZL and having a diameter of equal to or greater than 3.40 mm, NH represents the number of kinds of the dimples being located in a high latitude region ZH and having a diameter of equal to or greater than 3.40 mm, NHm represents the number of kinds of the dimples being located in a middle latitude region ZHm and having a diameter of equal to or greater than 3.40 mm and NHp represents the number of kinds of the dimples being located in a polar region ZHp and having a diameter of equal to or greater than 3.40 mm.

Abstract: The invention provides a golf ball with a ball surface having a plurality of non-circular dimples thereon, wherein mutually neighboring dimples have contour lines therebetween which are arranged so as to be substantially parallel and are separated by an interval of 0.05 to 1.0 mm, land areas defined by the substantially parallel contour lines have an outer surface which forms the outermost peripheral face of the ball, and the non-circular dimples have a non-circular shape with inside angles that are curved. This arrangement endows the ball with a distinctive, aesthetically pleasing appearance on account of the dimple pattern composed largely of non-circular dimples. Moreover, even though numerous non-circular dimples are arranged on the surface of the ball, the high surface coverage and air resistance-lowering effect enable the distance traveled by the ball to be increased.

Abstract: The invention provides a golf ball having a surface on which are formed a plurality of dimples having a circular outer edge that defines the dimple contour. Each dimple has formed therein, near a portion inside the dimple, a raised region with a circular edge, and also has formed therein, between the circular edge of the raised region and the circular outer edge of the dimple, a ring-like wall having a curved cross-sectional shape. The raised region has a top face which is substantially flat, and a height which is at most 60% of the dimple depth from the circular outer edge to the deepest position on the ring-like wall. In this golf ball, the distance of travel can be increased due to an air resistance-decreasing effect and a lift-maintaining effect.

Abstract: A golf ball includes an outer spherical surface and a plurality of dimples formed thereon. In accordance to one aspect of the invention, the dimples have a polygonal perimeter and a concave depression. The concave depression satisfies only two of the following conditions: a substantially circular depression perimeter, a substantially spherical shape, and the depression contacting the perimeter of the dimple. In accordance to another aspect of the invention, one or more sides of the polygonal perimeter may be non-linear or curved. The dimples of the present invention may fill the ball's entire outer surface, or the dimples may occupy a predetermined pattern on the ball. The predetermined pattern may also include one or more channels or raised beads on the surface of the ball.