Abstract: A golf ball 2 has a large number of dimples 10 on a surface thereof. A dimple pattern of each hemisphere of the golf ball 2 includes three units (T1, T2, and T3) that are rotationally symmetrical to each other. A dimple pattern of each unit includes two small units (T1a, T1b) that are mirror-symmetrical to each other. A standard deviation Su of areas of all the dimples 10 is not greater than 1.7 mm2. A standard deviation Pd of distances L between dimples 10 of all neighboring dimple pairs is less than 0.500 mm. A ratio So of a sum of areas of the dimples 10 relative to a surface area of a phantom sphere of the golf ball 2 is not less than 78.0%.

Abstract: A golf ball 2 includes a core 4, one or more mid layers 6, a cover 8, and dimples 10. A central hardness Ho and a surface hardness Hs of the core 4, a hardness Hm(min) of a layer having a lowest hardness among the mid layers 6, and a hardness Hc of the cover 8 satisfy the following mathematical formulas (1) to (4). Hs?Ho>15??(1) Hc?Hm(min)>20??(2) ?10<Hm(min)?Ho<15??(3) 5<Hc?Hs<20??(4) An occupation ratio So and a ratio Rs of a number of the dimples 10 each having a diameter of from 9.60% to 10.37% of a diameter of the golf ball 2, relative to a total number of the dimples 10, satisfy the following mathematical formula (5). Rs??2.5*So+273??(5).

Abstract: A golf ball has, on a surface thereof, a rugged pattern composed of a land and a large number of dimples. A method for designing the rugged pattern includes the steps of: (1) assuming a large number of circles on a surface of a phantom sphere; (2) assuming a large number of generating points 16 based on positions of the large number of circles; (3) assuming a large number of Voronoi regions 18 on the surface of the phantom sphere by a Voronoi tessellation based on the large number of generating points 16; and (4) assigning a dimple and a land to the surface of the phantom sphere based on contours of the large number of Voronoi regions 18.

Abstract: A golf ball 2 includes a core 4, a cover 8 positioned outside the core 4, and a paint film 10 positioned outside the cover 8. The paint film 10 includes an inner layer 12 and an outer layer 14 positioned outside the inner layer 12. A 10% modulus Mo of the outer layer 14 is lower than a 10% modulus Mi of the inner layer 12. A difference (Mi-Mo) between the modulus Mi and the modulus Mo is not less than 25.0 kgf/cm2. The cover 8 has a Shore D hardness Hc of not less than 50 and not greater than 65. The cover 8 has a thickness Tc of not less than 0.80 mm and not greater than 1.80 mm.

Abstract: A golf ball 2 includes a core 4, a mid layer 6, a cover 8, and dimples 10. A Shore C hardness Hmc of the mid layer 6 is greater than a Shore C hardness Hs at a surface of the core 4. A Shore D hardness He of the cover 8 is less than a Shore D hardness Hm of the mid layer 6. Peak values and orders of maximum peaks of data constellations of the golf ball 2 are calculated. A minimum value of the peak values is not less than 95 mm. A minimum value of the orders is not less than 27, and a maximum value of the orders is not greater than 37. An average of the orders is not less than 30 and not greater than 34.

Abstract: A golf ball 2 has a large number of dimples 10 on a surface thereof. Fifteen axes are assumed for a phantom sphere of the golf ball 2. 30240 points on a predetermined region of the surface of the golf ball 2 during backspin about each axis are determined. A length L1 of a perpendicular line that extends from each point to the axis is calculated. A total length L2 is calculated by summing 21 lengths L1 calculated based on 21 perpendicular lines arranged in a direction of the axis. A transformed data constellation is obtained by performing Fourier transformation on a data constellation of 1440 total lengths L2 calculated along a direction of rotation about the axis. A peak value and an order of a maximum peak of the transformed data constellation are calculated. A minimum value of 15 peak values is not less than 95 mm.

Abstract: A golf ball includes a core, one or more mid layers, a cover, and dimples. A central hardness Ho and a surface hardness Hs of the core, a hardness Hm(min) of a layer having a lowest hardness among the mid layers, and a hardness Hc of the cover satisfy the following mathematical formulas (i) to (iv).

Abstract: An object of the present invention is to provide a golf ball traveling a great distance on driver shots.

Abstract: A golf ball 2 includes a large number of dimples 10 on a surface thereof. The surface has a northern hemisphere N and a southern hemisphere S. Each of the hemispheres has a high-latitude region 14, a mid-latitude region 18 and a low-latitude region 16. The high-latitude region 14 has a latitude range of 40° or greater but 90° or less. The mid-latitude region 18 has a latitude range of 20° or greater but less than 40°. The low-latitude region 16 has a latitude range of 0° or greater but less than 20°. The number of planes that can divide a dimple pattern of the hemisphere so that divided dimple patterns are mirror symmetry to each other is one. Neither a dimple pattern of the high-latitude region 14 nor a dimple pattern of the low-latitude region 16 is rotationally symmetrical.

Abstract: A golf ball 2 includes a main body 4 and a paint film 6. The paint film 6 includes an inner layer 14 and an outer layer 16. A modulus Min of the inner layer 14 is higher than a modulus Mout of the outer layer 16. A difference (Min?Mout) is not less than 25 kgf/cm2. The golf ball 2 has a plurality of dimples 18. A ratio So of a sum of areas of the dimples 18 relative to a surface area of a phantom sphere of the golf ball 2 and a ratio Rs of a number of the dimples 18 each having a diameter of not less than 9.60% and not greater than 10.37% of a diameter of the golf ball 2, relative to a total number of the dimples 18, satisfy the following mathematical formula (1). Rs??2.

Abstract: An object of the present invention is to provide a golf ball traveling a great distance on driver shots.

Abstract: A golf ball 2 has a plurality of dimples 12 and a land 14 on a surface thereof. The golf ball 2 further has a large number of minute projections 18 formed on surfaces of the dimples 12 and the land 14. An average depth Fav of the dimples 12 and an average height Hav of the minute projections 18 satisfy the following mathematical formula (1). Hav<Fav*0.05??(1) An average value Pav of pitches P between the minute projections 18 and other minute projections 18 adjacent to the minute projections 18 is not less than 10 ?m and not greater than 2000 ?m.

Abstract: A golf ball has a plurality of dimples 12 and a land 14 on a surface thereof. The golf ball further has a large number of minute projections 18 formed on surfaces of the dimples 12 and the land 14. An average pitch Pav of these minute projections 18 is less than 100 ?m. An average height Hav of these minute projections 18 is not less than 0.5 ?m and not greater than 50 ?m. The golf ball satisfies the following mathematical formula. Lav<3*Tav In the mathematical formula, Lav represents an average value of distances L between the minute projections 18 and other minute projections 18 adjacent to the minute projections 18, and Tav represents an average value of widths T of these minute projections 18.

Abstract: A golf ball 2 includes a main body 4 and a paint film 6. The paint film 6 includes an inner layer 14 and an outer layer 16. A modulus Min of the inner layer 14 is higher than a modulus Mout of the outer layer 16. A difference (Min?Mout) is not less than 25 kgf/cm2. The golf ball 2 has a plurality of dimples 18. A ratio So of a sum of areas of the dimples 18 relative to a surface area of a phantom sphere of the golf ball 2 and a ratio Rs of a number of the dimples 18 each having a diameter of not less than 9.60% and not greater than 10.37% of a diameter of the golf ball 2, relative to a total number of the dimples 18, satisfy the following mathematical formula (1). Rs??2.

Abstract: A golf ball 2 includes a core 4, one or more mid layers 6, a cover 8, and dimples 10. A central hardness Ho and a surface hardness Hs of the core 4, a hardness Hm(min) of a layer having a lowest hardness among the mid layers 6, and a hardness Hc of the cover 8 satisfy the following mathematical formulas (1) to (4). Hs?Ho>15??(1) Hc?Hm(min)>20??(2) ?10<Hm(min)?Ho<15??(3) 5<Hc?Hs<20??(4) An occupation ratio So and a ratio Rs of a number of the dimples 10 each having a diameter of from 9.60% to 10.37% of a diameter of the golf ball 2, relative to a total number of the dimples 10, satisfy the following mathematical formula (5). Rs??2.

Abstract: A golf ball 2 includes a core 4, a mid layer 6, a cover 8, and dimples 10. A difference DH in hardness between a surface and a central point of the core 4, a thickness Tm and a hardness Hm of the mid layer 6, a thickness Tc and a hardness Hc of the cover 8, and an amount of compressive deformation Sb meet the following mathematical formulas. (DH*Hm)/(Hc*Tc)>80 ((Sb*Tc)/(Hc* Hm*Tm))*1000>0.75 An area ratio So of dimples 10 and a ratio Rs of a number of the dimples 10 each having a diameter of equal to or greater than 9.60% but equal to or less than 10.37% of a diameter of the golf ball 2 meet the following mathematical formula (3). Rs??2.

Abstract: A golf ball 2 has a large number of dimples 10 on a surface thereof. The contours of the dimples 10 are non-circular. A standard deviation of areas of the dimples 10 is equal to or less than 1.7 mm2. A ratio of a total area of the dimples 10 relative to a surface area of a phantom sphere of the golf ball 2 is equal to or greater than 80%. By comparting lines CS obtained by projecting sides of a regular dodecahedron, which is inscribed in the phantom sphere, onto the phantom sphere, a surface of the phantom sphere can be divided into 12 units Ut each of which meets the following mathematical formula (I): ?2?(Nt/12)?Nu?2??(I), where Nt represents the total number of the dimples 10 and Nu represents the number of the dimples 10 on one unit.

Abstract: An object of the present invention is to provide a golf ball traveling a great distance on driver shots and on iron shots.

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: 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%. The number NL of the large dimples 10L is equal to or greater than 250 but less than 450. The number NL of the large dimples 10L and a degree G of uniformity of areas of the large dimples 10L satisfy the following mathematical formula (II): G<0.0032·NL+0.26??(II).