IRON-TYPE GOLF CLUB HEAD

摘要

An iron-type golf club head comprises an upper heel-side region having a specific gravity ρ1, a lower heel-side region having a specific gravity ρ2, an upper middle region having a specific gravity ρ3, a lower middle region having a specific gravity ρ4, an upper toe-side region having a specific gravity ρ5 and a lower toe-side region having a specific gravity ρ6 which satisfy the following conditions: ρ1<ρ2, ρ3<ρ4, ρ5<ρ6, ρ4<ρ2, ρ4<ρ6, ρ3<ρ1, and ρ3<ρ5. These six regions are sectioned by a horizontal plane, a toe-side vertical plane and a heel-side vertical plane.

主权项

1. An iron-type golf club head comprising
an upper heel-side region having an average specific gravity ρ1, a lower heel-side region having an average specific gravity ρ2, an upper middle region having an average specific gravity ρ3, a lower middle region having an average specific gravity ρ4, an upper toe-side region having an average specific gravity ρ5 and a lower toe-side region having an average specific gravity ρ6 which satisfy the following conditions (1) to (7):
ρ1<ρ2  (1)ρ3<ρ4  (2)ρ5<ρ6  (3)ρ4<ρ2  (4)ρ4<ρ6  (5)ρ3<ρ1  (6)ρ3<ρ5  (7)and which regions are sectioned by an upper horizontal plane, a toe-side vertical plane and a heel-side vertical plane,wherein
in a standard state of the club head set on a horizontal plane at a lie angle and a loft angle specified for the club head, the upper horizontal plane is positioned 17 mm above the horizontal plane, the toe-side vertical plane extends parallel with a front-back direction of the club head at a position 15 mm toward the toe from a club face center, and the heel-side vertical plane extends parallel with a front-back direction of the club head at a position 15 mm toward the heel from the club face center.