| 摘要 |
A golf ball having a multi-layered core comprising at least three core layers and a dimpled cover is disclosed. The core may have three layers, A, B and C, four layers, A, B, C and D, five layers, A, B, C, D and E or up to six layers, A, B, C, D, E and F. In accordance to the present invention, the radius or thickness of each core layer is at least twice as much as the adjacent outer core layer. One outer core layer can be a water vapor barrier layer to protect the ball from water vapor encroachment, which reduces the performance of the ball. Another outer core layer can be a thin dense layer with high specific gravity to increase the rotational moment of inertia to reduce the spin of the ball during flight. Another outer core layer can be a perforated spherical shell to increase the resilience and/or coefficient of restitution of the ball. Another outer core layer could be a cushioning layer to act as a shock absorber. The core layers may also have increasing or decreasing hardness.
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