Patent ID: 7175542
Filing Date: 2007-02-13
Classification: A63B

Abstract:
1. A multi-piece solid golf ball comprising a multilayer core having at least an inner core layer and an outer core layer, one or more cover layer which encloses the core, and numerous dimples formed on a surface of the cover layer, the golf ball being characterized in that at least one cover layer is made primarily of an ionomer resin, the following hardness conditions (1) to (3) are satisfied: (1) (JIS-C hardness of cover)−(JIS-C hardness at center of core)≧27, (2) 23≦(JIS-C hardness at surface of core)−(JIS-C hardness at center of core)≦40, and (3) 0.50≦[(deflection amount of entire core)/(deflection amount of inner core layer)]≦0.75, the number of dimples is from 250 to 390, and the ball has an initial velocity of at least 76.8 m/s.