Solid golf ball
First Claim
1. A solid golf ball, comprising a solid core and a cover of one or more layers which encloses the core and has on a surface thereof numerous dimples, wherein:
- the solid core has a diameter of 38.7 to 39.6 mm and a deflection hardness of 3.0 to 4.0 mm;
the cover has a Shore D hardness of 59 to 70 and has 313 to 371 dimples formed thereon;
the ball has an initial velocity of at least 76.8 m/s, 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, and a 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; and
the solid core has a JIS-C hardness at the surface thereof of 78 to 85, a JIS-C hardness at the center thereof of 60 to 68, and a difference therebetween of at least 10 but not more than 19.
1 Assignment
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Accused Products
Abstract
A solid golf ball is composed of a solid core and a cover of one or more layers which encloses the core and has on a surface thereof numerous dimples. The solid core has a diameter of 38.7 to 39.6 mm and a deflection hardness of 3.0 to 4.0 mm. The cover has a Shore D hardness of 59 to 70 and has 313 to 371 dimples formed thereon. The ball has an initial velocity of at least 76.8 m/s, 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, and a 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. The golf ball has a carry which is long enough to make the ball advantageous for competitive play, in addition to which it has a good feel when hit and excellent durability to cracking with repeated impact.
84 Citations
5 Claims
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1. A solid golf ball, comprising a solid core and a cover of one or more layers which encloses the core and has on a surface thereof numerous dimples, wherein:
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the solid core has a diameter of 38.7 to 39.6 mm and a deflection hardness of 3.0 to 4.0 mm; the cover has a Shore D hardness of 59 to 70 and has 313 to 371 dimples formed thereon; the ball has an initial velocity of at least 76.8 m/s, 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, and a 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; and the solid core has a JIS-C hardness at the surface thereof of 78 to 85, a JIS-C hardness at the center thereof of 60 to 68, and a difference therebetween of at least 10 but not more than 19. - View Dependent Claims (2, 3, 5)
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4. A solid golf ball, comprising a solid core and a cover of one or more layers which encloses the core and has on a surface thereof numerous dimples, wherein:
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the solid core has a diameter of 38.7 to 39.6 mm and a deflection hardness of 3.0 to 4.0 mm; the cover has a Shore D hardness of 59 to 70 and has 313 to 371 dimples formed thereon; the ball has an initial velocity of at least 76.8 m/s, 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, and a 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; and the solid core is formed of a single layer or an inner/outer plurality of layers, and one or all of the core layers contains a rubber material synthesized with a rare earth catalyst or a Periodic Table group VIII metal compound catalyst.
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Specification