Patent ID: 7563180
Filing Date: 2009-07-21
Classification: A63B

Abstract:
1. A multi-piece solid golfball comprising a core, an intermediate layer enclosing the core to form a sphere, and a cover enclosing the intermediate layer, and numerous dimples formed on a surface of the cover, wherein each component has a Shore D hardness, a Deflection amount, an initial velocity (in m/s) and a thickness (in mm), the Deflection amount being defined as an amount of deflection (in mm) under load of a spherical body incurred when the load is increased from an initial value of 98 N (10 kgf) to a final value of 1275 N (130 kgf, and the ball satisfies the following requirements (1)to(4), (11)&(12): (1) (Shore D hardness of the cover)−(Shore D hardness of the intermediate layer)>0, (2A) (initial velocity of the core)−(initial velocity of the ball)≧0, (3) 0.87≦(Deflection amount of the sphere)/(Deflection amount of the core)≦0.97, (4) the total of the thickness of the intermediate layer and the thickness of the cover is up to 3.0 mm, (11) (Deflection amount of the golf ball)/(Deflection amount of the sphere)≦0.98, and (12) (Shore D hardness of core surface)−(Shore D hardness of core center)≧15.