Patent ID: 8910368

Claim:
A method for manufacturing an iron golf club that includes a head main body having a face, on which is formed on its front surface a plurality of grooves disposed so that a toe-heel direction corresponds to a lengthwise direction thereof, and having a shaft attachment portion provided on one side thereof and a shaft connected to the shaft attachment portion, the method comprising: forming the grooves such that each groove includes a bottom surface, a side wall, and a contour line connecting the side wall to the face surface; implementing heat input on an edge portion of each of the grooves facing a striking surface of the face in order to melt the edge portion so that a comer is formed, wherein; the heat input is implemented such that the corner taken in a cross-sectional plane orthogonal to the face surface and the lengthwise direction of the grooves is formed so that the contour line of the edge portion of each of the grooves is located between a first circle that contacts the face surface and a side surface of each of the grooves and has a radius of 0.010 inches (0.254 millimeters) and a second circle that is concentric with the first circle and has a radius of 0.011 inches (0.2794 millimeters); the heat input is performed using laser beam heating; the corner is formed by heat generated during the heat input simultaneously with the heat input in which only the edge portion is irradiated and the edge portion is melted into a liquid or semi-liquid, and by surface tension; and the contour line before the heat input was located outside of the region defined between the first circle and the second circle.