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Multi-piece solid golf ball

  • US 7,270,614 B2
  • Filed: 02/08/2006
  • Issued: 09/18/2007
  • Est. Priority Date: 01/28/2004
  • Status: Active Grant
First Claim
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1. A multi-piece solid golf ball, comprising a core, an intermediate layer enclosing the core to form a sphere, and a cover enclosing the intermediate layer, and numerous dimples formed on a surface of the cover, wherein each component has a Shore D hardness, a Deflection amount, an initial velocity (in m/s) and a thickness (in mm), the Deflection amount being defined as an amount of deflection (in mm) under load of a spherical body incurred when the load is increased from an initial value of 98 N (10 kgf) to a final value of 1275 N (130 kgf), and the ball satisfies the following requirements (1) to (4), (11) &

  • (12);

    (1) (Shore D hardness of the cover)—

    (Shore D hardness of the intermediate layer)>

    0,(2A) (initial velocity of the core)—

    (initial velocity of the ball)≧

    0,(3) 0.87 (Deflection amount of the sphere)/(Deflection amount of the core)≦

    0.97,(4) the total of the thickness of the intermediate layer and the thickness of the cover is up to 3.0 mm,(11) (Deflection amount of the golf ball)/(Deflection amount of the sphere)≦

    0.98, and(12) (Shore D hardness of core surface)—

    (Shore D hardness of core center)≧

    15,wherein the total number of the dimples is at least 280 and not more than 360,the ball has a coefficient of lift (CL) when hit of at least 0.165 at a Reynolds number of 70,000 and a spin rate of 2,000 rpm, anda coefficient of drag (CD) when hit of not more than 0.230 at a Reynolds number of 180,000 and a spin rate of 2,520 rpm.

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