Golf club head
View Patent ↗A golf club head in which a frequency F (fix) indicating a primary minimum value of a frequency transfer function of a head obtained by firmly fixing the head to a vibrator and measured in accordance with an vibrator method is between 600 and 1200 (Hz), and a frequency F (free) indicating a primary minimum value of a frequency transfer function of the head obtained by making the head in a free state and measured in accordance with an impact hammer method is between 2500 and 4000 (Hz).
1. A golf club head having
a face portion,
a crown portion forming a head upper surface, and
a sole portion forming a head bottom surface, and wherein
a thickness of the face portion is not more than 2.7 mm,
a thickness of the crown portion is not more than 0.9 mm,
a thickness of the sole portion is not more than 1.0 mm, and
the head, when mounted on a horizontal surface to have a set lie angle and face angle, with a vertical cross section passing through a center of the face portion and being perpendicular to the face surface and said horizontal surface, has (1) a smallest radius of curvature of an outer surface in the crown portion of not less than 500 mm, measured at the vertical cross section, and (2) a smallest radius of curvature of an outer surface in the sole portion of not less than 1000 mm, measured at the vertical cross section, and wherein
a frequency F (fix) indicating a primary minimum value of a frequency transfer function of a head obtained by firmly fixing the head to a vibrator and measured in accordance with a vibrator method is between 600 and 1200 Hz, a frequency F (free) indicating a primary minimum value of a frequency transfer function of the head obtained by placing the head in a free state and measured in accordance with an impact hammer method is between 2500 and 4000 Hz, and a ratio F (free)/F (fix) between said frequency F (fix) and said frequency F (free) is between 4.2 and 6.0.
2. A golf club head according to claim 1 , wherein
said frequency F (fix) is between 600 and 1000 Hz, and
said frequency F (free) is between 2500 and 3800 Hz.
3. A golf club head according to claim 1 , wherein
said frequency F (fix) is between 600 and 900 Hz, and
said frequency F (free) is between 2500 and 3500 Hz.
4. A golf club having the head according to claim 1 .
5. A golf club head according to claim 1 , wherein the golf club head comprises a hollow, metallic structure.
6. A golf club head according to claim 1 , wherein the head has a smallest radius of curvature of an outer surface in the crown portion of 600 to 800 mm, measured at the vertical cross section.
7. A golf club head according to claim 1 , wherein the head when mounted on a horizontal surface to have a set lie angle and face angle, with a vertical cross section passing through a center of the face portion and being perpendicular to the face surface and said horizontal surface, has a smallest radius of curvature of an outer surface in the sole portion of 1200 to 1500 mm, measured at the vertical cross section.
8. A golf club head according to claim 1 , wherein the head when mounted on a horizontal surface to have a set lie angle and face angle, with a vertical cross section passing through a center of the face portion and being perpendicular to the face surface and said horizontal surface, has a ratio of a smallest radius of curvature of an outer surface in the crown portion, measured at the vertical cross section, to a smallest radius of curvature of an outer surface in the sole portion, measured at the vertical cross section, in the range of 0.4 to 0.6.
9. A golf club head according to claim 1 , wherein said frequency F (free) is between 2500 and 3500 Hz.
10. A golf club head having a hollow, metallic structure comprising a face portion, a crown portion forming a head upper surface, and a sole portion forming a head bottom surface, wherein
the head has a frequency F(fix) of a primary minimum value of a frequency transfer function of between 600 and 1200 Hz obtained by firmly fixing the head to a vibrator and measured in accordance with an vibrator method, and
a frequency F(free) of a primary minimum value of a frequency transfer function of between 2500 and 4000 Hz obtained by placing the head in a free state and measured in accordance with an impact hammer method, and wherein
the head when mounted on a horizontal surface to have a set lie angle and face angle, with a vertical cross section passing through a center of the face portion and being perpendicular to the face surface and said horizontal surface, has a ratio of a smallest radius of curvature of an outer surface in the crown portion, measured at the vertical cross section, to a smallest radius of curvature of an outer surface in the sole portion, measured at the vertical cross section, in the range of 0.4 to 0.6.
11. A golf club head according to claim 10 , wherein said frequency F (free) is between 2500 and 3500 Hz.
12. A golf club head according to claims 10 or 11 , wherein a ratio F (free)/F (fix) between said frequency F (fix) and said frequency F (free) is between 4.2 and 6.0.
13. A golf club head according to claim 1 , wherein the golf club head is formed substantially from a metallic alloy.
14. A golf club head having
a face portion,
a crown portion forming a head upper surface, and
a sole portion forming a head bottom surface, and wherein
the face portion has a thickness of not more than 2.7 mm,
the crown portion has a thickness of not more than 0.9 mm, and
the sole portion has a thickness of not more than 1.0 mm, and wherein
a frequency F (fix) indicating a primary minimum value of a frequency transfer function of a head obtained by firmly fixing the head to a vibrator and measured in accordance with a vibrator method is between 600 and 1200 Hz, a frequency F (free) indicating a primary minimum value of a frequency transfer function of the head obtained by placing the head in a free state and measured in accordance with an impact hammer method is between 2500 and 4000 Hz, and a ratio F (free)/F (fix) between said frequency F (fix) and said frequency F (free) is between 4.2 and 6.0.
15. A golf club head according to claim 14 , wherein
the face portion has a thickness of about 2.0 to 2.7 mm,
the crown portion has a thickness of about 0.5 to 0.9 mm, and
the sole portion has a thickness of about 0.5 to 1.0 mm.
16. A golf club head according to claim 14 , wherein
the face portion has a thickness of about 2.3 to 2.7 mm,
the crown portion has a thickness of about 0.7 to 0.9 mm, and
the sole portion has a thickness of about 0.7 to 1.0 mm.
17. A golf club head in which a frequency F (fix) indicating a primary minimum value of a frequency transfer function of a head obtained by firmly fixing the head to a vibrator and measured in accordance with an vibrator method is between 600 and 1200 Hz, a frequency F (free) indicating a primary minimum value of a frequency transfer function of the head obtained by placing the head in a free state and measured in accordance with an impact hammer method is between 2500 and 4000 Hz, and a ratio F (free)/F (fix) between said frequency F (fix) and said frequency F (free) is between 4.2 and 6.0, and wherein
the golf club head is formed substantially from a metallic alloy, and
the golf club head has a crown portion having a thickness of not more than 0.9 mm.