Golf club head

• US 7,677,990 B2
• Filed: 11/26/2007
• Issued: 03/16/2010
• Est. Priority Date: 11/30/2006
• Status: Active Grant

• Current Assignee: Bridgestone Sports Co Limited (Bridgestone Corporation)
• Original Assignee: Bridgestone Sports Co Limited (Bridgestone Corporation)
• Inventors: Ban, Wataru
• Primary Examiner(s): Passaniti; Sebastiano
• Application Number:
  US11/944,920
• Publication Number:
  US 20080132352A1
• Time in Patent Office: 841 Days
• Field of Search: 473324-350, 473287-292
• US Class Current: 473/331
• CPC Class Codes: A63B 53/0408 characterised by specific dimensions, e.g. thickness
• CPC Class Codes: A63B 53/0445 Details of grooves or the like on the impact surface
• CPC Class Codes: A63B 53/0466 wood-type
• CPC Class Codes: A63B 53/047 iron-type

Abstract

A golf club head of this invention includes a face and a plurality of striations formed on the face by milling. A pitch P in the arrangement direction of the plurality of striations satisfies 300 μm≦P≦600 μm. The surface roughness of a region in the face with the striations satisfies in the maximum height of the profile Ry, 15 μm≦Ry≦0.005×P+15.7 μm.

Claims

1. A golf club head including:

a face;

a plurality of score line grooves formed on the face; and

a plurality of striations formed on said face by milling,

wherein a pitch P in an arrangement direction of said plurality of striations satisfies

300 μ

m≦

P≦

600 μ

m,

a surface roughness of a region in said face with said striations satisfies in a maximum height of profile Ry, where

15 μ

m≦

Ry≦

0.005×

P+15.7 μ

m,

said striations do not intersect with each other on said face, and

each score line groove intersects with a plurality of said striations.

2. The golf club head according to claim 1, wherein the pitch P satisfies

400 μ

m≦

P≦

500 μ

m.

3. The golf club head according to claim 1, wherein each striation forms a circular arc, and said arrangement direction is a direction that intersects the center of the circular arc of each striation.

4. The golf club head according to claim 3, wherein a radius of each circular arc is the same.