Patent ID: 6551202
Filing Date: 2003-04-22
Classification: A63B

Abstract:
A multi-piece solid golf ball comprising:a core composed of an inner layer core and an outer layer core formed on the inner layer, and at least one layer of a cover formed on the core, wherein the inner layer core has a diameter of 24 to 40 mm and a center hardness in JIS-C hardness of 40 to 60, a surface hardness in JIS-C hardness of the inner layer core higher than the center hardness by 20 to 40, the outer layer core having a thickness of 2.0 to 7.0 mm and a surface hardness in JIS-C hardness of 75 to 90, and the outermost layer of the cover has a thickness of 1.0 to 2.0 mm and a Shore D of 40 to 63, and assuming that the center hardness and surface hardness in JIS-C hardness of the inner layer core are represented as A and B respectively, and the surface hardness in JIS-C hardness and the thickness of the outer layer core are represented as C and T respectively, the golf ball satisfies the following formula: 0&lE;{T(Câˆ’B)âˆ’(60âˆ’A)}&lE;10; and â€ƒthe difference between the surface hardness of the outer layer core and the inner hardness at the central point in the thickness of the outer layer core is not more than 2.