Golf club head
Abstract
Disclosed is a golf club head which enables to improve a direction of a hit ball while assuring a carry and run of the ball corresponding to a head speed and a position at which the ball is hit on a face part, and enables to assure a stable direction of a hit ball while realizing a stable carry and run of the ball even if the ball is hit at a position other than the sweet spot. More specifically, in the golf club head, center of figure Cf of the face part roughly coincides with sweet spot Ss which is a point of intersection of the face part and a perpendicular line dropped from the center of gravity of the head toward the face part, and roll radius R 2 of the face part at a position distance Z apart from center of figure Cf of the face part along vertical axis Lz fulfils a predetermined conditional equation, provided that a moment of inertia around an axis orthogonal to a vertical plane containing sweet spot Ss and a center of gravity of the head is Ix, a distance from the sweet spot to the center of gravity of the head is Yg, and a loft angle is θ 0 .
Claims
exact text as granted — not AI-modified1 . A golf club head comprising:
a face part having a curved surface and being a ball-hitting surface; a crown part connecting to an upper edge of said face part and composing an upper part; and a sole part connecting to a lower edge of said face part and composing a lower part, and satisfying a requirement that a center of figure of said face part roughly coincide with a sweet spot which is a point of intersection of said face part and a perpendicular line dropped from a center of gravity of the head toward said face part.
2 . The golf club head according to claim 1 , wherein bulge radius R 1 of said face part fulfils the following conditional Equation 1, provided that a moment of inertia around a vertical axis is Iz and a distance from the sweet spot to the center of gravity of the head is Yg.
(
Sp
+
16
)
·
Iz
1930
·
Yg
Rb
-
30.4
<
R
1
<
(
Sp
+
32
)
·
Iz
1930
·
Yg
Rb
-
60.8
[
Equation
1
]
3 . The golf club head according to claim 2 , wherein bulge radius R 1 of said face part is constant throughout said face part.
4 . A golf club head comprising:
a face part having a curved surface and being a ball-hitting surface; a crown part connecting to an upper edge of said face part and composing an upper part; and a sole part connecting to a lower edge of said face part and composing a lower part, and satisfying requirements that a center of figure of said face part roughly coincide with a sweet spot which is a point of intersection of said face part and a perpendicular line dropped from a center of gravity of the head toward said face part and roll radius R 2 of said face part at a position distance Z apart from a center of figure of said face part along a vertical axis fulfill the following conditional Equation 2, provided that a moment of inertia around an axis orthogonal to a vertical plane containing a sweet spot and a center of gravity of the head is Ix, a distance from the sweet spot to the center of gravity of the head is Yg, and a loft angle is θ 0 .
170
·
z
(
106
·
Yg
-
224
)
·
z
Ix
-
2.97
·
θ
0
+
68.1
<
R
2
<
170
·
z
(
106
·
Yg
-
224
)
·
z
Ix
-
2.97
·
θ
0
+
64.6
[
Equation
2
]
5 . The golf club head according to claim 4 , wherein roll radius R 2 of said face part is constant throughout said face part.Cited by (0)
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