| 摘要 |
PURPOSE: An automatic speed control golf ball for putting practice is provided to enable a user to enjoy practicing golf regardless of place. CONSTITUTION: An automatic speed control golf ball for putting practice comprises a change sensing block which senses the change of a golf ball and generates a change sensing signal, holes (104) which are formed on the surface (102) of the golf ball and have a guide groove through which a protrusion (106) enters, protrusions which enter the holes through the guide groove, and a control unit which exposes the protrusions to the outside of the holes when the change sensing signal occurs. The change sensing block senses an impact applied to the golf ball and the movement of the golf ball. |
