| 摘要 |
Golf ball has dimples 8 . The dimple 8 has a first curved face S 1 , a second curved face S 2 , a third curved face S 3 , a first edge E 1 , a second edge E 2 and a third edge E 3 . The second edge E 2 and the third edge E 3 are disposed concentrically with the first edge E 1 . The first curved face S 1 is ring-shaped. The first curved face S 1 is inclined downward from the first edge E 1 toward the center of the dimple 8 . The second curved face S 2 is ring-shaped. The second curved face S 2 is inclined upward from the second edge E 2 toward the center of the dimple 8 . The third curved face S 3 is bowl-shaped. The third curved face S 3 is inclined downward from the third edge E 3 toward the center of the dimple 8 . The air that flows toward the center of the dimple 8 collides with the third edge E 3 . Due to this collision, the air flow is disrupted.
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