| CPC A63B 37/00221 (2020.08) [A63B 37/0019 (2013.01); A63B 37/0031 (2013.01); A63B 37/0044 (2013.01); A63B 37/0078 (2013.01); A63B 37/0083 (2013.01); A63B 37/06 (2013.01)] | 13 Claims |
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1. A multi-piece solid golf ball comprising a core, an intermediate layer, and a cover, wherein the core is formed of a rubber composition in a single layer or a plurality of layers, the intermediate layer and the cover are both formed of a resin composition, a specific gravity of the intermediate layer is at least 1.05, and the core has a hardness profile in which, letting a Shore C hardness at a core center be Cc, a Shore C hardness at a midpoint M between the core center and a core surface be Cm, respective Shore C hardnesses at positions 2 mm, 4 mm, and 6 mm inward from the midpoint M be Cm−2, Cm−4, and Cm−6, and respective Shore C hardnesses at positions 2 mm, 4 mm, and 6 mm outward from the midpoint M be Cm+2, Cm+4, and Cm+6, and a Shore C hardness at the core surface be Cs, and defining surface areas A to F as follows:
surface area A: ½×2×(Cm−4−Cm−6)
surface area B: ½×2×(Cm−2−Cm−4)
surface area C: ½×2×(Cm−Cm−2)
surface area D: ½×2×(Cm+2−Cm)
surface area E: ½×2×(Cm+4−Cm+2)
surface area F: ½×2×(Cm+6−Cm+4)
the following condition is satisfied:
(surface area E+surface area F)−(surface area A+surface area B)≥3.0
and letting a deflection (mm) when the core is compressed under a final load of 1,275 N (130 kgf) from an initial load of 98 N (10 kgf) be C (mm), the following two conditions are satisfied:
Cs−Cc≥28.0
C×(Cs−Cc)≥132.0.
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