Golf ball,申请号US20050050770-传众专利搜索

Golf ball

申请公布号：US7300363(B2)

申请号：US20050050770

申请日期：2005.02.07

申请公布日期：2007.11.27

申请人：

BRIDGESTONE SPORTS CO., LTD.

发明人：KASASHIMA ATSUKI

分类号：A63B37/06

主分类号：A63B37/06

摘要：A golf ball is composed of a resilient core, a cover which encloses the core, is made primarily of a polyurethane thermoplastic elastomer and has on a surface thereof 250 to 370 dimples, and at least one intermediate layer disposed between the core and the cover. The core has a center portion and a surface portion that is harder than the center portion, the hardness difference expressed in JIS-C hardness units being in a range of 15 to 30, and has a deflection of 1.8 to 4.0 mm when subjected to an increase in load from an initial load state of 98 N (10 kgf) to a load of 1,275 N (130 kgf). The intermediate layer has a Shore D hardness of 55 to 75, and the cover has a Shore D hardness of 30 to 58. The dimples, which are a combination of at least five types having contour lengths at a dimple edge position in a range of 7 to 20 mm, have a total volume of 400 to 700 mm<SUP>3 </SUP>and a surface coverage relative to an overall surface of the ball of at least 79%.