Golf putter and method of designing the same

1. A golf putter designed to have a weight balance wherein:

three moments of inertia M 1 , M 2 , and M 3 defined in units of g·cm 2 by the following descriptions (1) to (3) satisfy the following expressions (A) and (B):

M 1− M 2<12000  (A)

M1> M 2> M 3  (B),

(1) M 1 : a moment of inertia of the putter about a first axis through a reference point P, parallel to a face surface and perpendicular to a shaft axis, the reference point P defined by an intersection of the shaft axis and a perpendicular line from a putter-supporting point on the shaft to the shaft axis in a static balance state of the one-point supported putter;

(2) M 2 : a moment of inertia of the putter about a second axis through the reference point P and perpendicular to the first axis and to the shaft axis; and

(3) M 3 : a moment of inertia of the putter about a third axis defined by the shaft axis.

2. The golf putter according to claim 1 , wherein the M 3 is more than 5000 g·cm 2 .

3. A method of designing a golf putter, which defines a weight balance of the putter considering a correlation of magnitudes of three moments of inertia M 1 , M 2 , and M 3 g·cm 2 defined by the following descriptions (1) to (3) and a value of M 1 −M 2 ,

(1) M 1 : a moment of inertia of the putter about a first axis through a reference point P, parallel to a face surface and perpendicular to a shaft axis, the reference point P defined by an intersection of the shaft axis and a perpendicular line from a putter-supporting point on the shaft to the shaft axis in a static balance state of the one-point supported putter;

(2) M 2 : a moment of inertia of the putter about a second axis through the reference point P and perpendicular to the first axis and to the shaft axis; and

(3) M 3 : a moment of inertia of the putter about a third axis defined by the shaft axis; and wherein the method comprises the following steps:

adjusting the magnitudes of M 1 , M 2 and M 3 to achieve a predetermined correlation of M 1 , M 2 and M 3 ; and

further adjusting the magnitudes of M 1 and M 2 , as needed, so that M 1 is greater than M 2 , and the value of M 1 −M 2 is no greater than a predetermined magnitude.

4. The method of designing a golf putter according to claim 3 , which defines the M 1 , the M 2 , and the M 3 g·cm 2 in a manner to provide a weight balance satisfying following expressions (A) and (B):

M 1 −M 2<12000  (A)

M 1 >M 2 >M 3   (A).