Patent ID: 6626771
Filing Date: 2003-09-30
Classification: A63B

Abstract:
A golf ball comprising a core and a cover, said golf ball satisfying the following conditions (1) to (6):(1) the number of dimples is 360 to 492; (2) total volume enclosed by the dimples as expressed as a percentage of the volume of said golf ball, VR, is 0.715% to 0.825%, wherein VR is expressed as below; VR=VS43&it;Ï€&it;â€ƒ&it;R3Ã—100wherein VS is total space volume of dimples, each having a dimple space volume VP, and R is the radius of the golf ball (an imaginary sphere) and a dimple space volume VP is defined as the volume of a space enclosed by a dimple surface and a plane surrounded by an edge of the dimple; (3) total surface area of the dimples as expressed as a percentage of the surface area of said golf ball, SR, is not less than 70%, wherein SR is expressed as below; SR=SS4&it;Ï€&it;â€ƒ&it;R2wherein SS is total surface area of dimples, and R is the radius of a golf ball (an imaginary sphere) and surface area of a dimple is defined as the area of a dimple surface below the plane surrounded by the dimple edge; (4) said cover has a Shore D hardness of 53 to 63; (5) a difference obtained through subtraction of JIS C hardness of a surface portion of said core from JIS C hardness of said cover is 4 to 16; and (6) initial velocity is in excess of 77.7 m/s (255 ft/s).