Multi-piece solid golf ball

  • US 6,780,125 B1
  • Filed: 08/06/1998
  • Issued: 08/24/2004
  • Est. Priority Date: 08/11/1997
  • Status: Expired due to Term
First Claim
Patent Images

1. A multi-piece solid golf ball comprising;

  • a solid core and a cover consisting of inner and outer layers surrounding the core, the outer cover layer having a surface formed with a plurality of dimples,said solid core having a distortion of 2.8 to 6.5 mm under an applied load of 100 kg, and a product of the Shore D hardnesses of said inner cover layer multiplied by the Shore D hardness of said outer cover layer and a proportion VR (%) of the total of the volumes of dimple spaces each defined below a plane circumscribed by the dimple edge to the overall volume of a phantom sphere given on the assumption that the golf ball surface is free of dimples satisfy any one of the following combinations (1) to (5);

    (1) the product of Shore D hardnesses of inner and outer cover layers;

    1,500 to less than 2,000 VR;

    0.8 to 0.93% (2) the product of Shore D hardnesses of inner and outer cover layers;

    2,000 to less than 2,500 VR;

    0.75 to 1.05% (3) the product of Shore D hardnesses of inner and outer cover layers;

    t2,500 to less than 3,000 VR;

    0.7 to 1% (4) the product of Shore D hardnesses of inner and outer cover layers;

    3,000 to less than 3,500 VR;

    0.65 to 0.95% (5) the product of Shore D hardnesses of inner and outer cover layers;

    3.500 to 4,000 VR;

    0.6 to 0.9%, and said dimples include at least three types of dimples which are different in at least one of, diameter, depth, and value V0 which is the volume of one dimple space defined below a plane circumscribed by the dimple edge divided by the volume of a cylinder whose bottom is the plane and whose height is the maximum depth of the dimple from the bottom; and

    wherein both the hardness of the inner and outer cover layers are up to 63 in Shore D hardness.

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