Abstract: Based on a surface shape appearing at a predetermined point moment by moment during rotation of a golf ball having numerous dimples on its surface, a data constellation regarding a parameter dependent on a surface shape of the golf ball is calculated. Preferably, the parameter is a distance between an axis of the rotation and the surface of the golf ball. Another preferable parameter is a volume of space between a surface of a phantom sphere and the surface of the golf ball. Based on a maximum value and a minimum value of the data constellation, a fluctuation range is calculated. By dividing the fluctuation range by a total volume of the dimples, an evaluation value is calculated. This value is calculated for each of PH rotation and POP rotation.

Abstract: A golf ball 2 includes a spherical core 4, a mid layer 6 outside the core 4, and a cover 8 outside the mid layer 6. The core 4 includes a spherical center 10 and an envelope layer 12 outside the center 10. At all points P included in a zone that extends over a distance range from equal to or greater than 1 mm to equal to or less than 15 mm from the central point of the core 4, the following mathematical formula is satisfied. ?5<H2?H1<5 In the mathematical formula, H1 indicates the JIS-C hardness at a point P1 located radially inward of each point P at a distance of 1 mm from the point P, and H2 indicates the JIS-C hardness at a point P2 located radially outward of each point P at a distance of 1 mm from the point P.

Abstract: At all points Pa in a zone A extending over a distance range from equal to or greater than 1 mm to less than 5 mm from the central point of a core 4, a mathematical formula, Ha2?Ha1<5, is satisfied. At any of points Pb in a zone B extending over a distance range from equal to or greater than 5 mm to equal to or less than 10 mm from the central point of the core 4, a mathematical formula, Hb2?Hb1?5, is satisfied. Ha1 and Ha2 indicate JIS-C hardnesses at points Pa1 and Pa2 located radially inward and outward of each point Pa at a distance of 1 mm from the point Pa. Hb1 and Hb2 indicate JIS-C hardnesses at points Pb1 and Pb2 located radially inward and outward of the point Pb at a distance of 1 mm from the point Pb.

Abstract: A ball 2 has, in a ball surface layer area, an aroma layer 16 including a scent component. The aroma layer 16 is provided locally. The aroma layer 16 may be provided on the entire surface. The scent component is preferably at least one member selected from the group consisting of terpenes, ester compounds, aromatic compounds, ether compounds, aldehyde compounds, alcohol compounds, natural essential oils, hydrocarbons, ketone compounds, lactone compounds, and nitrogen-containing compounds. A perfume-material-encapsulating microcapsule may be used. The local aroma layer 16 is preferably provided by stamping. The aroma layer may be formed by spraying. A scent adsorbent may be further used. Preferably, the golf ball 2 is put into a package 20.

Abstract: A golf ball 2 has a spherical core 4, a mid layer 6 situated on the external side of the core 4, and a cover 8 situated on the external side of the mid layer 6. The core 4 has a spherical center 10 and an envelope layer 12 situated on the external side of the center 10. At all points P included in a zone away from the central point of the core 4 at a distance of 1 mm or greater and 15 mm or less, the following mathematical expression is satisfied. H2?H1?5 In the above mathematical expression, H1 represents the JIS-C hardness at a point P1 that is located inside the point P along the radial direction and away from the point P at a distance of 1 mm, and H2 represents the JIS-C hardness at a point P2 that is located outside the point P along the radial direction and away from the point P at a distance of 1 mm.

Abstract: At all points Pa included in zone “A” away from the central point of the core 4 at a distance of 1 mm or greater and less than 5 mm, the following mathematical expression (I) is satisfied, and at any point Pb included in zone “B” away from the central point of the core 4 at a distance of 5 mm or greater and 10 mm or less, the following mathematical expression (II) is satisfied. Ha2?Ha1<5??(I) Hb2?Hb1?5??(II) Ha1 represents the hardness at a point Pa1 that is located inside the point Pa along the radial direction and away from the point Pa at a distance of 1 mm, and Ha2 represents the hardness at a point Pa2 that is located outside the point Pa along the radial direction and away from the point Pa at a distance of 1 mm.

Abstract: The golf ball 2 has a northern hemisphere N and a southern hemisphere S. The northern hemisphere N is adjacent to the southern hemisphere S across an equatorial line Eq. Each of the northern hemisphere N and the southern hemisphere S has a pole vicinity region 14 and an equator vicinity region 16. Each of the pole vicinity region 14 and the equator vicinity region 16 has a large number of dimples. The dimple pattern of the pole vicinity region 14 includes three units that are rotationally symmetrical to each other about a pole Po. The dimple pattern of the equator vicinity region 16 includes six units that are rotationally symmetrical to each other about the pole Po. The sum (Ps+Pp) of a peak value Ps and a peak value Pp of the golf ball 2 is equal to or greater than 600 mm.

Abstract: An object of the present invention is to provide a golf ball having an individualized and improved appearance by imparting the luster, without lowering durability and a color developing property of the paint film and/or the mark. Another object of the present invention is to provide a golf ball having an improved visibility, which the mark should inherently provide. The present invention provides a golf ball comprising a golf ball body, a mark formed on the golf ball body, a paint film coating the golf ball body and the mark, wherein the mark and/or the paint film contains a luster material, wherein the luster material has a core material having a transparent base and a first transparent layer formed on the transparent base; and at least one composite layer formed on the core material and consisting of a second transparent layer having a lower refractive index than the first transparent layer, and a third transparent layer having a higher refractive index than the second transparent layer.

Abstract: A golf ball 14 has a northern hemisphere N above an equatorial line Eq and a southern hemisphere S below the equatorial line Eq. Each of the northern hemisphere N and the southern hemisphere S has a pole vicinity region 30, an equator vicinity region 32, and a mid region 34. Each of the pole vicinity region 30, the equator vicinity region 32, and the mid region 34 has numerous dimples 20. The dimple pattern of the pole vicinity region 30 includes four units that are rotationally symmetrical to each other about a pole P. The dimple pattern of the equator vicinity region 32 includes six units that are rotationally symmetrical to each other about the pole P. The dimples 20 included in the mid region 34 are arranged along a mid latitude line 28. The number of the dimples 20 included in the mid region 34 is 24.

Abstract: A mold (1) includes an upper mold half (U) and a lower mold half (L). The mold (1) includes a gate (G), a pole vent pin (P), a support pin (S) and an intermediate vent pin (M). The support pin (S) has a latitude (?s) of 45 degrees to 85 degrees. Each of the upper mold half (U) and the lower mold half (L) has at least three support pins (S). The intermediate vent pin (M) has a latitude (?m) of 45 degrees to 85 degrees. Each of the upper mold half (U) and the lower mold half (L) has at least three intermediate vent pins (M). A difference between the latitude (?m) of the intermediate vent pin (M) and the latitude (?s) of the support pin (S) is equal to or smaller than 15 degrees. A clearance between the intermediate vent pin (M) and a pin hole (13) is 5 ?m to 50 ?m. By the mold (1), a cover having a thickness of 1.4 mm or less is formed.

Abstract: A golf ball 2 has a core, a mid layer and a cover. This mid layer comprises 10 parts by weight or greater and 70 parts by weight or less of a thermoplastic elastomer containing a styrene block having a material hardness of less than 10, and 30 parts by weight or greater and 90 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. Hardness of this mid layer is less than 40, and the thickness is equal to or less than 1.2 mm. This golf ball 2 has seven kinds of dimples (A to G), each having a different diameter. When all the dimples are arranged in decreasing order of the diameter Di, ratio (Dx/Dn) of the mean diameter Dx of the dimples ranking in the top 10% to the mean diameter Dn of the dimples ranking in the bottom 10% is equal to or greater than 1.30. Standard deviation ? of diameters of all the dimples is equal to or less than 0.52.

Abstract: A mold 2 includes a pair of mold halves (upper mold half 4 and lower mold half 6). A spherical cavity is formed by mating upper mold half 4 and lower mold half 6. A large number of pimples 10 are provided on the cavity face of the upper mold half 4 and lower mold half 6. The upper mold half 4 and the lower mold half 6 have flat plane 14, protrusions 16 and recesses 18, respectively. Each protrusion 16 projects from the equator Eq. Each recess 18 is depressed from the equator Eq. The protrusion 16 includes a part of the pimple 10. A central angle ? between a protrusion (a) and a protrusion (b) adjacent to the protrusion (a) is different from the central angle ? between the protrusion (a) and a protrusion (c) adjacent to the protrusion (a). The absolute value of a difference (???) is equal to or greater than 10°.

Abstract: Golf ball 2 has numerous dimples 8. Provided that mean diameter of all the dimples 8 is Da, 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 is equal to or greater than 2.70. Ratio (N2/N1) of number N2 of the adjacent dimple pairs having a pitch of (Da/20) or less to the number N1 is equal to or greater than 0.50. The northern hemisphere N and the southern hemisphere S of this golf ball 2 have a pole vicinity region 20, an equator vicinity region 22 and a coordination region 24, respectively. The pole vicinity region 20 includes 5 units which are rotationally symmetric each other centered on the pole point P. The equator vicinity region 22 includes 6 units which are rotationally symmetric each other centered on the pole point P. The coordination region 24 does not include any unit.

Abstract: Golf ball 2 has a center 5, a mid layer 6, a cover 4 and numerous dimples 8. A product Pm of a volume Vm multiplied by a flexural rigidity Fm in the mid layer 6 and a product Pc of a volume Vc multiplied by a flexural rigidity Fc in the cover meet the following formulae (I) and (II). 1400<(Pm+Pc)<2000 ??(I) 5.0<(Pc/Pm)<7.6 ??(II) 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 the 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 numerous dimples 8. The surface of the golf ball is divided by comparting lines CM corresponds to edges of a regular icosahedron into eight first spherical regular triangles T1, six second spherical regular triangles T2, and six third spherical regular triangles T3. The first spherical regular triangles T1 do not include the equatorial line EQ. The second spherical regular triangles T2 and the third spherical regular triangles T3 include the equatorial line EQ. The dimple pattern on the first spherical regular triangle T1 is different from the dimple patterns on the second spherical regular triangle T2 and third spherical regular triangle T3. The dimple pattern on the first spherical regular triangle T1 has rotational symmetry and line symmetry. The dimple pattern on the second spherical regular triangle T2 and the third spherical regular triangle T3 has neither a rotational symmetry nor line symmetry. This golf ball 2 does not have any great circle path.

Abstract: A golf ball 2 includes a center 12, a mid layer 14, a reinforcing layer 6, a cover 8 and a paint layer 10. The golf ball 2 has a large number of dimples 16 on the surface thereof. The cover 8 is formed of a resin composition including thermoplastic polyurethane (A) and a polyisocyanate mixture (B). The polyisocyanate mixture (B) includes a urethane prepolymer (B1) having two or more isocyanate groups or an isocyanate compound (B2) having three or more isocyanate groups. The polyisocyanate mixture (B) further includes a thermoplastic resin (B3) which substantially does not react with an isocyanate group. The golf ball 2 is obtained by a mold having protrusions which project from the equator of the mold. Each protrusion includes a part of a pimple.

Abstract: A golf ball 2 includes a center 12, a mid layer 14, a reinforcing layer 6, a cover 8 and a paint layer 10. The golf ball 2 has a large number of dimples 16 on the surface thereof. The cover 8 is formed of a resin composition including thermoplastic polyurethane (A) and a polyisocyanate mixture (B). The polyisocyanate mixture (B) includes a urethane prepolymer (B1) having two or more isocyanate groups or an isocyanate compound (B2) having three or more isocyanate groups. The polyisocyanate composition (B) further includes a thermoplastic resin (B3) which substantially does not react with an isocyanate goup. The golf ball 2 is obtained by a mold having protrusions which projects from the equator of the mold. Each protrusion includes a part of a pimple.

Abstract: A golf ball 2 includes a core 4, a cover 6, and a paint layer 8. The golf ball 2 has numerous dimples 10 on the surface thereof. The cover 6 is formed of a resin composition including thermoplastic polyurethane (A) and a polyisocyanate mixture (B). The polyisocyanate mixture (B) includes a polyisocyanate compound (B1) having two or more isocyanate groups or a urethane prepolymer (B2) having two or more isocyanate groups. The cover 6 has a hardness of 30 or greater and 55 or less. The cover 6 has a thickness of 1.0 mm or greater and 2.0 mm or less. The ratio of the total volume of all the dimples 10 to the surface area of a phantom sphere of the golf ball is less than 75%. The dimples 10 have a curvature radius at the edge thereof in a range of 0.1 mm to 10 mm.

Abstract: Based on a surface shape appearing at a predetermined point moment by moment during rotation of a golf ball having numerous dimples on its surface, a data constellation regarding a parameter dependent on a surface shape of the golf ball is calculated. Preferably, the parameter is a distance between an axis of the rotation and the surface of the golf ball. Another preferable parameter is a volume of space between a surface of a phantom sphere and the surface of the golf ball. Based on a maximum value and a minimum value of the data constellation, a fluctuation range is calculated. By dividing the fluctuation range by a total volume of the dimples, an evaluation value is calculated. This value is calculated for each of PH rotation and POP rotation.

Abstract: Mold 2 includes a pair of mold halves (upper mold half 4 and lower mold half 6). A spherical cavity is formed by mating upper mold half 4 and lower mold half 6. A large number of pimples 10 are provided on the cavity face of the upper mold half 4 and lower mold half 6. The upper mold half 4 and the lower mold half 6 have flat plane 14, protrusion 16 and recess 18, respectively. The protrusion 16 projects from the equator Eq. The recess 18 is depressed from the equator Eq. The protrusion 16 includes a part of the pimple 10. The proportion P1 of the number of the protrusion 16 that is adjacent to other protrusion 16 belonging to other mold half distinct from the mold half to which itself belongs, to the total number of the protrusions 16 is equal to or greater than 50%. The proportion Pw of the sum total of the widths of the protrusions 16 measured along the equator, to the entire length of the equator is equal to or greater than 35%.