Patent ID: 8202177
Filing Date: 2012-06-19
Classification: A63B

Abstract:
1. A golf ball having values Ad 1 and Ad 2 which are obtained by the steps of: (1) assuming a line connecting both poles of the golf ball as a first rotation axis; (2) assuming a great circle which exists on a surface of a phantom sphere of the golf ball and is orthogonal to the first rotation axis; (3) assuming two small circles which exist on the surface of the phantom sphere of the golf ball, which are orthogonal to the first rotation axis, and of which an absolute value of a central angle with the great circle is 30°; (4) defining, among the surface of the phantom sphere, a region sandwiched between the two small circles by dividing the phantom sphere at the two small circles; (5) determining 30240 points arranged at an interval of a central angle of 3° in a direction of the first rotation axis and at an interval of a central angle of 0.25° in a direction of rotation about the first rotation axis; (6) calculating a length L (7) calculating a total length L (8) determining a maximum value and a minimum value among 1440 total lengths L (9) calculating the value Ad (10) assuming a second rotation axis orthogonal to the first rotation axis assumed at the step (1); (11) assuming a great circle which exists on the surface of the phantom sphere of the golf ball and is orthogonal to the second rotation axis; (12) assuming two small circles which exist on the surface of the phantom sphere of the golf ball, which are orthogonal to the second rotation axis, and of which an absolute value of a central angle with the great circle is 30°; (13) defining, among the surface of the phantom sphere, a region sandwiched between the two small circles by dividing the phantom sphere at the two small circles; (14) determining 30240 points arranged at an interval of a central angle of 3° in a direction of the second rotation axis and at an interval of a central angle of 0.25° in a direction of rotation about the second rotation axis; (15) calculating a length L (16) calculating a total length L (17) determining a maximum value and a minimum value among 1440 total lengths L (18) calculating the value Ad wherein the values Ad