Abstract: A golf ball comprising an outer surface including a plurality of dimples that form indicia. The plurality of dimples take the form of text letters, characters or other symbols and are relatively similar in size to a plurality of conventional shaped dimples or larger. The plurality of dimples occupy a substantial portion of the ball's surface in a repeating, distributed pattern.

Abstract: Golf ball 2 has numerous dimples 8 formed on its surface. The dimple 8 has a first side wall face 14, a second side wall face 16 that is positioned to the bottom side of this first side wall face 14, and a bottom face 18 that is positioned to the bottom side of this second side wall face 16. Curvature radius R1 of the first side wall face 14 is equal to or greater than a virtual curvature radius Rx. Curvature radius R2 of the second side wall face 16 is smaller than the virtual curvature radius Rx. Curvature radius R3 of the bottom face 18 is equal to or greater than the virtual curvature radius Rx. Depth d1 of the first side wall face 14 is 0.10 times or greater and 0.50 times or less of the depth d of the dimple 8. Maximum diameter D2 of the second side wall face 16 is 0.60 times or greater and 0.95 times or less of the diameter D1 of the dimple 8.

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: 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 method for arranging dimples on a golf ball involves the steps of previously drawing a plurality of imaginary lines connecting one pole and the equator on one hemisphere to equally divide the hemispherical surface into a plurality of spherical isosceles triangle regions; arranging a number of dimples within a pair of spherical isosceles triangle regions such that the dimples in the triangle regions are in axial symmetry with respect to the imaginary line; rotationally moving the arranged dimples about the ball axis; and arranging dimples on the other hemisphere such that they are in point symmetry with the dimples as moved on the one hemisphere with respect to the ball center.

Abstract: Disclosed is a dimple pattern on a golf ball, which consists of a plurality of dimples of various sizes for providing an optimum impact at the moment of hitting the golf ball. The dimple pattern formed on a circumferential surface of a golf ball has a total of 1070 dimples, including first dimples with a diameter of 3.8 mm, second dimples with a diameter of 3.2 mm, third dimples with a diameter of 2.4 mm, and fourth dimples with a diameter of 0.9 mm, wherein the number of the first dimples is 414, and the total number of the second to fourth dimples is 656. As the dimples of various sizes are repeatedly arranged with predetermined spaces, impact pressure is uniformly transferred to the golf ball over an entire contact area with a club face at the moment a golf club impacts on the golf ball, thereby removing the hook and slice, so that the straightness and stability of the golf ball while the golf ball is flying can be improved and the flight distance of the golf ball can be increased.

Abstract: A golf ball which has markings of letters or figures on its surface with concave parts and/or convex parts, wherein the markings manifest themselves with depressions and/or grooves having a substantially uniform depth from the surface. The markings are clearly visible.

Abstract: Golf ball 2 has a core 4, a mid layer 6, a reinforcing layer 8 and a cover 10. Base polymer of the mid layer 6 includes an ionomer resin as a principal component. The mid layer 6 has a hardness Hm as measured with a Shore D type hardness scale of equal to or greater than 55. Base polymer of the reinforcing layer 8 is a thermosetting resin. Base polymer of the cover 10 includes a thermoplastic polyurethane elastomer as a principal component. The cover 10 has a nominal thickness Tc of equal to or less than 0.6 mm. The cover 10 has a hardness Hc as measured with a Shore D type hardness scale of equal to or less than 54. Ratio (Tr/Tc) of the thickness Tr of the reinforcing layer to the nominal thickness Tc of the cover is 0.005 or greater and 3.0 or less. This golf ball 2 includes dimples 12 having a depth Dp. Thickness Td of the cover 10 immediately below the deepest site of one or more of the dimples 12 is greater than (Tc?Dp).

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: Golf ball 2 has a core 4, a mid layer 5 and a cover 6. The mid layer 5 has a hardness of 50 or greater and 70 or less, and a thickness of equal to or greater than 0.8 mm. The cover 6 has a hardness of less than 57, and a thickness of less than 1.5 mm. The golf ball 2 has numerous double radius dimples and numerous triple radius dimples on the surface thereof. Proportion of the double radius dimples is 20% or greater and 42% or less, and proportion of the triple radius dimples is equal to or greater than 50%. Ratio (Tm/Tc) of the thickness Tm of the mid layer 5 to the thickness Tc of the cover 6 is 0.5 or greater and 4.0 or less.

Abstract: In a golf ball having a spherical surface with numerous dimples thereon, the dimples have a diameter of 2 to 6 mm and number in all from 250 to 330, of which at least 60% are large dimples having a diameter of at least 4.5 mm. The volume of space in a dimple below a planar surface circumscribed by an edge of the dimple, summed for all the dimples on the surface of the ball, is from 320 to 360 mm3. The golf ball rises well when hit and is easy even for an inexperienced golfer to hit.

Abstract: Golf ball 2 has a center 8, a mid layer 10, a cover 6 and dimples 12. The mid layer 10 includes a styrene block-containing thermoplastic elastomer having a material hardness of less than 10, and an ethylene-(meth)acrylic acid copolymer-based ionomer resin having a material hardness of 50 or greater and 70 or less. This mid layer 10 has a hardness equal to or less than 50, and a thickness of equal to or less than 1.6 mm. The dimple has: a first side wall face 18 that has a curvature radius R1 which is equal to or greater than a phantom curvature radius Rx; a second side wall face 20 that is positioned to the bottom side than the first side wall 18 face and has a curvature radius R2 which is smaller than the phantom curvature radius Rx; and a bottom face 22 that is positioned to the bottom side than the second side wall face 20 and has a curvature radius R3 which is equal to or greater than the phantom curvature radius Rx.

Abstract: A golf ball product, or other non-streamlined body, having a dimple pattern in which at least some of the dimples overlap at least one adjacent dimple is disclosed. A new parameter called Overlap Saturation (OS) is disclosed. OS is the ratio of the number of overlap instances on a ball to the maximum possible number for an ideal hypothetical ball with the same number of dimples. Overlap instances are tallied by summing the number of overlapping neighbor dimples for every dimple. Golf ball products employing the disclosed dimple patterns have an increase in total yardage compared to an equivalent product without overlapping dimples.

Abstract: Golf ball 2 has numerous double radius dimples and numerous triple radius dimples on the surface thereof. The double radius dimple has a first side wall face having a curvature radius R1, and a bottom face having a curvature radius R2 that is 5 times or more and 55 times or less greater than the curvature radius R1 and being positioned on the bottom side than the first side wall face. The triple radius dimple has a first side wall face having a curvature radius that is greater than the phantom curvature radius Rx, a second side wall face being positioned on the bottom side than the first side wall face and having a curvature radius that is smaller than the phantom curvature radius Rx, and a bottom face being positioned on the bottom side than the second side wall face and having a curvature radius that is greater than the phantom curvature radius Rx.

Abstract: Disclosed herein is a golf ball having on its surface a number of dimples and a number of edges separating dimples from each other, wherein the edges are formed from a plurality of edge elements joined together such that some of the joining parts of the edge elements assume a smoothly curved shape as viewed from above. The golf ball has improved aerodynamic performance due to dimples and achieves a long flying distance.

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: A golf ball having traditional dimples and a tubular lattice structure is disclosed herein. The golf ball has dimples and a plurality of lattice members that form multi-faceted polygons. Each of the plurality of lattice members has an apex and the golf ball of the present invention conforms with the 1.68 inches requirement for USGA-approved golf balls. The interconnected lattice members form a plurality of polygons, preferably hexagons and pentagons. Each of the lattice members preferably has a continuous contour.

Abstract: A golf ball having a surface on which are formed numerous dimples and numerous edges which define the dimples is characterized in that the edges are composed of a plurality of edge elements, and the dimples include dimples which are defined by a plurality of edge elements and are non-circular as viewed from above. Dimple effects on the golf ball enhance the aerodynamic performance, enabling the ball to achieve an increased carry.

Abstract: Golf ball 2 has a northern hemisphere N above the equatorial line 16, and a southern hemisphere S below the equatorial line 16. Each of the northern hemisphere N and the southern hemisphere S has a pole vicinity region 18, an equator vicinity region 20 and a coordination region 22. The pole vicinity region 18, the equator vicinity region 20 and the coordination region 22 have numerous dimples 8, respectively. The dimple pattern in the pole vicinity region 18 includes multiple units that are rotationally symmetric each other centered on the pole point P. The dimple pattern in the equator vicinity region 20 includes multiple units that are rotationally symmetric each other centered on the pole point P. Number of the units in the pole vicinity region 18 is different from number of the units in the equator vicinity region 20. The dimple pattern in the coordination region 22 cannot be comparted into multiple units that are rotationally symmetric each other centered on the pole point P.

Abstract: The present invention provides a three-piece solid golf ball having long flight distance by accomplishing low spin amount and high launch angle at the time of hitting, while maintaining good shot feel. The present invention relates to a three-piece solid golf ball comprising a core composed of a center and an intermediate layer formed on the center, and a cover covering the core and having many dimples on the surface thereof, wherein the center has a diameter of 10 to 20 mm and a central point hardness in JIS-A hardness of 20 to 90, the intermediate layer has a surface hardness in Shore D hardness of 50 to 65, and the cover has a Shore D hardness of 55 to 70, a flexural modulus of not less than 280 MPa and a thickness of 0.5 to 2.5 mm.

Abstract: A golf ball having a plurality of dimples arranged on its surface is provided wherein the ball surface is free of a great circle that does not intersect with dimples, at least 7% of the total number of dimples are non-circular dimples, and some non-circular dimples lie across the equator of the ball corresponding to a parting plane of a mold. The ball is improved in flight distance and aerodynamic uniformity.

Abstract: A multi-lobed golf ball dimple 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 and may be further defined by spoke-like ridges. 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 multi-lobed dimple may include uniform and non-uniform dimples. The curvature of the circumferential segments can be defined by a ratio of an inside radius to an outside radius. Each dimple also includes a slightly convex floor that is continuous and smooth. The curvature may match that of the outer surface of the golf ball. Further, a sloped wall interrupted by spoke-like ridges may connect the convex floor with the outer surface of the golf ball.

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: Two-tiered dimples 8 of a golf ball have a first recessed part X and a second recessed part Y. The first recessed part X substantially forms a part of a spherical shape. The first recessed part X includes a first opening 14, a side wall curved face 16 and a flat face 18. The second recessed part Y is substantially a regular quadrangular pyramid. This second recessed part Y includes a second opening 20, a slope 22 and a bottom face 24. The second opening 20 is a regular tetragon. The first recessed part X improves aerodynamic symmetry of the golf ball. The second recessed part Y improves a dimple effect. Proportion of the number of the two-tiered dimples 8 to total number of the dimples is equal to or greater than 70%.

Abstract: Golf ball 2 has a core 4, a mid layer 5 and a cover 6. This mid layer 5 includes 20 parts by weight or greater and 60 parts by weight or less of a styrene block-containing thermoplastic elastomer having a material hardness of less than 10, and 40 parts by weight or greater and 80 parts by weight or less of an ethylene-(meth)acrylic acid copolymer-based ionomer resin having a material hardness of 50 or greater and 70 or less. This mid layer 5 has a hardness of 35 or greater and 50 or less, and a thickness of equal to or less than 1.2 mm. The golf ball 2 has numerous double radius dimples and numerous triple radius dimples on the surface thereof. Proportion of the double radius dimples is 20% or greater and 42% or less, and proportion of triple radius dimples is equal to or greater than 50%.

Abstract: A golf ball having a predetermined radius, and a spherical outer surface with a multiplicity of dimples formed therein. A protrusion is formed in each of the dimples which are located in hit portions having a diameter of 5–15 mm, or alternatively, is formed in each of all the dimples. The protrusion has a distal end whose radial distance from the center of the golf ball is equal to the predetermined radius of the golf ball. The protrusion has a partition wall which divides a space in each dimple into a plurality of segmental spaces. The protrusion may have two partition walls which are perpendicular to each other and intersect at right angles for dividing a space in each of the dimples into four segmental spaces.

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: A golf ball (20) having a plurality of standard dimples (33) and a plurality of covered dimples (31) is disclosed herein. Each of the plurality of covered dimples (31) has at least one overhang land area portion (50) that covers a portion of a concavity (55) of the covered dimple (31). A covered region (70) under the overhang land area portion (50) generates eddy currents during the flight of the golf ball (20) which creates greater turbulence at the surface (22) of the golf ball (20) allowing for greater distance.

Abstract: Golf ball 1 has multisurface dimples 4a. The multisurface dimple 4a has a central concave face 7 and six inclined faces 8. The inclined face 8 extends obliquely upward from the edge 9 of the central concave face 7 up to the phantom sphere. Two multisurface dimples 4a are adjacent each other sharing a boundary line 10 on spherical surface interpositioned therebetween. Total length of the boundary lines 10 that exist at the site where multisurface dimples 4a are adjacent each other is equal to or less than 2400 mm. Proportion of the multisurface dimples 4a occupied in total number of dimples is preferably equal to or greater than 70%. Proportion of the number of the boundary lines 10 occupied in the number of sites where multisurface dimples 4a are adjacent each other is equal to or greater than 70%.

Abstract: Golf ball 1 has a large number of dimples 2 on its surface. A surface area occupation ratio Y of these dimples 2 is equal to or greater than 75%. A ratio R1 of the diameter of the maximum dimple dmax to the diameter D of this golf ball 1 is 11.0% or greater and 18.0% or less. Total number N of the dimples is equal to or less than 320. A ratio R2 of number of dimples 2 having a diameter d accounting for 11.0% or greater and 18.0% or less of the diameter D, occupied in total number N is equal to or greater than 20%. A mean occupation ratio y which is a value calculated by dividing the surface area occupation ratio Y by total number N is equal to or greater than 0.22%. A summation X of the contour length x of the dimples 2 and the surface area occupation ratio Y satisfy the relationship represented by the following formula (I). X?38.

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. Shape constants in the catenary curve are used to vary the ball flight performance according to ball spin characteristics and player swing speed.

Abstract: In a golf ball, ridges each extending to define a non-circular shape, typically a polygonal or star shape, delimiting a predetermined area are arranged on its spherical surface in good balance for reducing the air resistance of the ball in flight and thus drastically improving the flight 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: A golf ball comprising a substantially spherical outer surface and a plurality of dimples formed thereon is provided. The dimples include polygonal dimples that are arranged such that the sides of adjacent polygonal dimples are substantially parallel to each other, and wherein the land area comprises first spacings and second spacings between adjacent dimples. The first spacings and the second spacings have substantially constant width between any two adjacent dimples and the width of the first spacings is different from the width of the second spacings. Circular dimples and circular land areas may also be included in the dimple pattern. The dimple pattern is easily adjusted to manipulate the aerodynamic efficiency of the golf ball.

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 2 containing dimples A having a diameter of 4.65 mm, dimples B having a diameter of 4.45 mm, dimples C having a diameter of 4.25 mm, dimples D having a diameter of 4.05 mm, dimples E having a diameter of 3.95 mm, dimples F having a diameter of 2.80 mm, and dimples G having a diameter of 2.65 mm. When all the dimples are arranged in decreasing order of the diameter Di, the mean diameter of the dimples ranking in the top 10% is represented by Dx (mm), and the mean diameter of the dimples 8 ranking in the bottom 10% is represented by Dn (mm), whereby Dx/Dn is equal to or greater than 1.30. The standard deviation ? of diameters of all the dimples is equal to or less than 0.5% and the mean value of the diameters of all the dimples is equal to or greater than 4.00 mm.

Abstract: A golf ball has a substantially spherical outer surface comprised of a plurality of non-circular dimples. The dimples are formed by a plurality of lobes extending from a central hub, wherein each lobe is defined by a curved outer segment. The curved outer segments form at least a portion of the perimeter of the dimple. The dimples are comprised of at least four lobes. The dimples can also be comprised of a plurality of radiating arms emanating from a location proximate the hub of the dimple.

Abstract: A golf ball (20) approaching zero land area is disclosed herein. The golf ball (20) has an innersphere with a plurality of lattice members (40) and a plurality of deep depressions (99). Each of the plurality of 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 lattice members (40) preferably form a plurality of polygons, preferably hexagons and pentagons. Each of the lattice members (40) preferably has a continuous contour.

Abstract: A golf ball containing a core and a cover, the core being composed of a center and a mid layer. Numerous dimples are formed on the surface of the cover. The cover includes a thermoplastic polyurethane elastomer as a principal component. The Shore D hardness of the cover is 30 or greater and 55 or less. The surface area occupation ratio Y of the dimples is equal to or greater than 75%. A ratio R1 of the diameter dmax of the maximum dimple to the diameter D of the golf ball is 11.0% or greater and 18.0% or less. A ratio R2 of the number of dimples having the diameter d accounting for 11.0% or greater and 18.0% or less of the diameter D of the golf ball to the total number N of the dimples is equal to or greater than 20%.

Abstract: A golf ball having a plurality of dimples demarcated by edges on the ball's surface, characterized in that the dimples each assume a non-circular shape (as viewed form above) with mutually intersecting curved edge elements of the edges and at least one of these non-circular dimples is demarcated by the edge whose edge element bulges toward the inside of the dimple. The golf ball has improved aerodynamic performance due to dimples and achieves a long flying distance.

Abstract: A golf ball has a large number of dimples (A to D) on a surface thereof. A surface area occupation ratio Y of the dimples is 0.80 to 0.90. A total volume V of the dimples is 300 mm3 to 700 mm3. A mean volume Va to be a value obtained by dividing the total volume V by a total number N of the dimples is 1.30 mm3 or more. A mean curvature R to be a mean value of a curvature r in the sectional shape of the dimple is 16 mm or more. A mean occupation ratio y to be a value obtained by dividing the surface area occupation ratio Y by the total number N of the dimples is 0.0022 or more. A sum X of a contour length x of the dimple and the surface area occupation ratio Y satisfy a relationship indicated by an expression (I): X?3882·Y+1495.

Abstract: A two-piece solid golf ball having long flight distance when hit by a middle iron club to a driver, large spin amount when hit by a short iron club and the like and excellent controllability, while maintaining good shot feel as good as thread wound golf ball, said golf ball including a core and cover, wherein the core mainly contains cis-1,4-polybutadiene, with the surface hardness (D) of the core being higher than the center hardness of the core by not less than 15, and the cover is formed from a cover composition mainly containing a polyurethane-based thermoplastic elastomer as a base resin having a hardness (A) of 35 to 55 which is lower than that of (D), and assuming that the total dimple volume is represented by B (mm3), the product AB is within the range of 20,000 to 30,000.

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: Golf ball has a core, a cover, and numerous dimples 12 formed on the surface of this cover. Principal component of the cover is a polyurethane elastomer. This cover has a Shore D hardness of 30 or greater and 55 or less. Occupation ratio Y of total area of the dimples 12 to surface area of a phantom sphere is equal to or greater than 75%. Proportion of the number NL of the dimples 12 having a diameter of equal to or greater than 3.90 mm to total number N of the dimples 12 is equal to or greater than 75%. Proportion of the number ML of dimples having a diameter of equal to or greater than 3.90 mm, having (Re/Rw) of 0.5 or greater and 1.5 or less, and having Re of 2.0 mm or greater and 5.0 mm or less to the number NL is equal to or greater than 50%.

Abstract: A golf ball of the type having a large number of convex parts projecting from the spherical surface, the convex parts assuming a round or non-round shape as viewed from above, wherein the improvement includes a large number of convex parts which are arranged such that the upper surface of the convex part has a certain radius of curvature and coincides with a hypothetical spherical surface covering the spherical surface, at least part of a large number of convex parts form a string of convex parts connected to each other through a part thereof, and the strings of convex parts form at least one great circle which is substantially continuous on the spherical surface. This golf ball is novel in appearance and excellent in flight performance.

Abstract: A golf ball 2 has a core 4, a cover 6, and numerous dimples 8. This cover 6 is composed of a resin composition which includes a thermoplastic styrene elastomer and an ionomer resin as principle components. A melt index of this resin composition at 190° C. is equal to or greater than 4.0 g/10 min. Ratio R1 of the diameter dmax of the maximum dimple to the diameter D of the golf ball 2 is 10.5% or greater and 17.0% or less. A ratio R2 of the number of dimples 8 having a diameter d accounting for 10.5% or greater and 17.0% or less of the diameter D of the golf ball 2, occupied in total number N of the dimples is equal to or greater than 20%. Shore D hardness of the cover 6 is 50 or greater and 63 or less.

Abstract: An improved dimple pattern for a golf ball is disclosed. The dimples may be arranged according to an Archimedean pattern. The dimples may be arranged on the golf ball such that there is no great circle about the golf ball that does not intersect a dimple. Preferred Archimedean patterns include a truncated octahedron, a great rhombcuboctahedron, a truncated dodecahedron, and a great rhombicosidodecahedron. A nonplanar parting line may be used. The parting line may include a parallel segment parallel to the true equator of the golf ball and a plurality of diverging segments that diverge and converge relative the true equator. The parallel segment may be non-collinear with the true equator. The diverging and converging parting line segments may cooperate to form areas that diverge and converge away from the true equator. The size of this area may be designed to not fully surround the biggest dimple or to minimize any undercut.

Abstract: In a golf ball, ridges each extending to define a non-circular shape, typically a polygonal or star shape, delimiting a predetermined area are arranged on its spherical surface in good balance for reducing the air resistance of the ball in flight and thus drastically improving the flight performance.

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 includes a multiplicity of dimples on its outer surface. At least one or more of the multiplicity of dimples are each configured to have a convex bottom portion formed by a circular-arc defined by a center positioned inside the ball and a curvature radius “r” mm smaller than a radius “R” mm of the ball but larger than a value (R?0.5) mm. The golf ball specified such that the shapes of the dimples are optimized as described above exhibits high flight characteristics.