Thread wound golf ball

#1. Field of the Invention

#The present invention relates to a thread wound golf ball.

#2. Description of the Related Art

#FIG. 1 is a cross-sectional view of a golf ball having a cover layer, a thread-wound layer, and a center.

#FIG. 1 shows the cross-sectional structure of a thread wound golf ball, according to the present invention. The rubber center 1 has a surface hardness (JIS-A) of not more than 60, and a deformation on 500 g loading of not less than 0.5 mm, as discussed below. Thread rubber layer 2 comprises a thread rubber wound around the solid rubber center. Cover layer 3 covers the thread rubber layer.

#The rubber center used in the present invention has a surface hardness (JIS-A) of not more than 60, preferably 10 to 45, and a deformation (500 g loading) of not less than 0.5 mm. When the surface hardness (JIS-A) of the rubber center is larger than upper limit of the above range, the formation of spin on hitting becomes large and impact strength is large, which results in inferior hit feeling. Further, when the deformation (500 g loading) is smaller than the lower limit of the above range, the formation of spin also becomes large and hit feeling becomes inferior.

#The outer diameter of the rubber center is preferably 23 to 34 mm, more preferably 26 to 32 mm. When the outer diameter is smaller than 23 mm, the formation of spin becomes large and launch angle becomes small. On the other hand, when the outer diameter is larger than 34 mm, the thread rubber layer becomes thin and a golf ball having a predetermined hardness can not be obtained.