Multi-piece solid golf ball

摘要

The present invention provides a multi-piece solid golf ball having a core, an envelope layer encasing the core, an intermediate layer encasing the envelope layer, and a cover which encases the intermediate layer and has, on a surface thereof a plurality of dimples. The envelope layer has an inner layer and an outer layer. The core is formed primarily of a rubber material. The inner and outer envelope layers, the intermediate layer and the cover are each formed primarily of the same or different resin materials. The inner and outer envelope layers, intermediate layer and cover have thicknesses and hardness values which satisfy particular specified inequalities and which occupy particular specified ranges. The golf ball has an outstanding flight performance and controllability which are acceptable to professionals and other skilled players, in addition to which it has an excellent durability to cracking under repeated impact and an excellent scuff resistance.

主权项

1. A multi-piece solid golf ball comprising a core, an envelope layer encasing the core, an intermediate layer encasing the envelope layer, and a cover which encases the intermediate layer and has formed on a surface thereof a plurality of dimples, wherein the envelope layer has an inner layer and an outer layer; the core is formed primarily of a rubber material; the inner and outer envelope layers, the intermediate layer and the cover are each formed primarily of the same or different resin materials; the inner and outer envelope layers, intermediate layer and cover have thicknesses which satisfy the following conditions (i) and (ii):
cover thicknessinner envelope layer hardnesscover hardness,  (iii) and wherein the total thickness of the envelope layer is at least 2.0 mm but not more than 10.0 mm; wherein the core has a deflection (P) when compressed under a final load of 1,275 N (130 kgf) from an initial load of 98 N (10 kgf) of at least 5.7 mm but not more than 12.0 mm, and the ball as a whole has a deflection (Q) when compressed under a final load of 1,275 N (130 kgf) from an initial load of 98 N (10 kgf) of at least 1.8 mm but not more than 4.0 mm, and wherein the value (P)−(Q) is at least 1.8 mm but not more than 10.0 mm; and wherein the value represented by (JIS-C hardness of inner envelope layer surface)−(JIS-C hardness of core surface) in JIS-C hardness units is at least 1 but not more than 20.