1. Field of the Invention
The present invention relates to a golf ball for a putting practice, and in particular to an improved golf ball for a putting practice in which a golf ball rolls and is moved in a desired direction by forming a concave groove or convex belt on a spherical surface of a golf ball.
2. Description of the Background Art
As shown in FIG. 2, a groove represents a concave portion formed in a spherical surface of a golf ball and having a certain width and depth, and as shown in FIG. 12 a belt represents a convex portion formed a spherical surface of the same and having a certain width and height.
Researches have been performed for many years for changing a size, depth and arrangement of the dimples formed on a surface of a golf ball for implementing a desired hydrodynamic property.
FIG. 1 is a perspective view illustrating a conventional golf ball. As shown in FIG. 1, the golf ball 1 has a plurality of dimples formed on a surface 2 of the same at a certain interval therebetween for thereby implementing a desired hydrodynamic property. When a golf practice player puts a golf ball, the golf ball rolls based on a putting force and putting angle and a state of a practice field and then is moved into a hole. The putting practice is directed to straightly rolling a golf ball in a direction of a hole. The golf ball may be rolled and moved in various directions based on the condition of the practice field. Therefore, in order to test and enhance a player's ability, the golf ball must be rolled and moved in a desired direction when practicing the golf ball. At this time, the players practice the putting using a golf ball which is generally used in an actual golf field.
However, in the conventional art, it is impossible for a practice player to select a certain golf ball based on his ability and to select the same based on his advanced ability.