MULTI-PIECE SOLID GOLF BALL

摘要

In a golf ball having a core, a cover and an intermediate layer therebetween, the ball and a sphere consisting of the core encased by the intermediate layer have surface hardnesses which satisfy a specific relationship, the intermediate layer and the cover have thicknesses which satisfy a specific relationship, and (initial velocity of intermediate layer-encased sphere)/(initial velocity of core)≧0.995. Also, the core, the intermediate layer-encased sphere and the ball have respective deflections under given compression conditions which satisfy a specific condition. When used by golfers whose head speed is not very fast, the ball achieves a good distance on shots with a driver, in addition to which it has a soft feel and is able to retain a high spin performance on approach shots.

主权项

1. A multi-piece solid golf comprising a core, a cover and an intermediate layer therebetween, wherein a sphere comprising the core and the intermediate layer which peripherally encases the core (intermediate layer-encased sphere) and the ball have respective surface hardnesses, expressed in terms of Shore D hardness, which satisfy the relationship:
(Shore D hardness at ball surface)≦(Shore D hardness at surface of intermediate layer-encased sphere);  (1) the intermediate layer and the cover have respective thicknesses which satisfy the relationship:
cover thickness≦intermediate layer thickness;  (2) the intermediate layer-encased sphere and the core have respective initial velocities which satisfy the relationship:
(initial velocity of intermediate layer-encased sphere)/(initial velocity of core)≧0.995; and  (3) the core, the intermediate layer-encased sphere and the ball, when compressed under a final load of 1,275 N (130 kgf) from an initial load of 98 N (10 kgf), have respective deflections (mm) A, B and C which satisfy the condition:
A+B+C≧11.5,  (4) with the proviso that A≧4.0 and C≧3.2.