Patent ID: 6390935
Filing Date: 2002-05-21
Classification: A63B

Abstract:
A three-piece golf ball comprising:a core having diameter of 38 to 41 mm consisting of a center which has a diameter of 27 to 37 mm, a specific gravity (a) wherein the specific gravity (a) ranges from 1.0 to 1.2, a JIS-C hardness (X) at the center point thereof, a JIS-C hardness (Y) at a surface thereof satisfying the equation: 8&lE;(Yâˆ’X)&lE;25, and a deformation amount (p) of the center when applying a load from 10 kgf as an initial load to 130 kgf as a final load thereto, and an outer shell placed-on the center, and having a specific gravity (b) satisfying the equation: 0.1&lE;(bâˆ’a) &lE;0.3; and a cover placed on the core having a Shore D hardness in the range of 50 to 60, wherein a JIS-C hardness (Z) at a surface of the core is in the range of 82 to 90, the JIS-C hardness (Z) satisfying the equation: 10&lE;(Zâˆ’X)&lE;35, and a deformation amount (q) of the core satisfies the equation: 0.5&lE;(pâˆ’q)<1.5, when applying a load from 10 kgf as an initial load to 130 kgf as a final load to the core.