Patent ID: 7201671
Filing Date: 2007-04-10
Classification: A63B

Abstract:
1. A multi-piece solid golf ball 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): (1) (Shore D hardness of the cover)−(Shore D hardness of the intermediate layer)>0, (2) (initial velocity of the sphere)−(initial velocity of the core)>−0.2, (3) 0.90≦(Deflection amount of the sphere)/(Deflection amount of the core)≦1.00, (4) the total of the thickness of the intermediate layer and the thickness of the cover is up to 3.0 mm, and the ball has a coefficient of lift (CL) when hit of at least 0.165 at a Reynolds number of 70,000 and a spin rate of 2,000 rpm, and a coefficient of drag (CD) when hit of not more than 0.230 at a Reynolds number of 180,000 and a spin rate of 2,520 rpm.