Surface structure i.e. flat golf ball structure, has shallow recesses distributed on upper boundary surface, where edge sections of recesses pass over spherical convex transition area in upper boundary surface

摘要

The structure has shallow recesses (16) distributed on an upper boundary surface (12), where edge sections of the recesses pass over a spherical convex transition area (20) in the surface. The recesses include intermediate groove sections, respectively, where the groove sections are designed in a spherical cap-shaped manner. The recesses exhibit a larger dimension in a flow direction. The recesses exhibit an average diameter of about 0.3 cm to 0.5 cm. Depth of the recesses ranges between 0.2 mm and 0.4 mm. An average distance between adjacent recesses lies between 0.2 cm and 0.5 cm.