Golf Club Head Scoreline Geometry for Spin Consistency
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Solution Overview
Problem
Existing golf club head designs with chamfered scorelines or finer grooves experience a decrease in back spin and variations in spin depending on the striking point, which can be uncomfortable for advanced golfers.
Innovation Solution
A golf club head with scorelines and fine grooves formed at an equal pitch, featuring rounded edges and fine groove formation regions between adjacent scorelines, where the fine grooves are parallel to the scorelines and perpendicular in direction, with specific geometric relationships to ensure consistent contact and minimize spin variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If chamfered edges are formed on scorelines to comply with the two-circle rule, then the scorelines meet regulatory requirements, but the back spin amount on struck golf balls decreases
Solution Approach 1:
The face surface is segmented into multiple functional zones: scoreline regions with rounded edges for compliance, fine groove formation regions for spin generation, and transition regions connecting them. This segmentation allows each zone to perform its specific function without compromising the other.
Solution Approach 2:
Different regions of the face surface are given different local qualities: scoreline edges are rounded for regulatory compliance, while the fine groove formation regions between scorelines maintain sharper features for spin generation. This local differentiation resolves the contradiction between compliance and performance.
2Reliability
If grooves finer than scorelines are formed in the face surface to prevent back spin decrease, then back spin is maintained, but a variation in back spin amount occurs depending on the position of a striking point
Solution Approach 1:
The fine grooves are arranged to create equipotential zones across the face surface, where each zone between adjacent scorelines has uniform spin-generating properties. This ensures that strikes at different positions within a zone produce consistent back spin, eliminating position-dependent variation.
Solution Approach 2:
The fine grooves are pre-formed in predetermined patterns during manufacturing, establishing consistent spin-generating characteristics across the face surface before use. This preliminary structuring ensures uniform performance regardless of striking position.
3Reliability
If multiple fine grooves are formed between adjacent scorelines to maintain back spin, then spin generation is improved, but the device complexity increases
Solution Approach 1:
The fine grooves are defined by specific geometric parameters (number N≥2, width W, interval d≥0, depth) that can be precisely controlled during manufacturing. By optimizing these parameters, the invention achieves effective spin generation without excessive complexity, as the grooves follow regular repeating patterns rather than irregular complex structures.
Data Source
AI summary
This invention provides a golf club head in which a plurality of scorelines are formed in its face surface at an equal pitch. Rounded portions are formed on the edges of the scorelines. Each region between adjacent scorelines includes a fine groove formation region in which N (N≧2) fine grooves are formed to extend parallel to the scorelines and to align themselves in a direction perpendicular to the scorelines at an interval d (d≧0). Letting S be the distance between the endpoints of the rounded portions of the adjacent scorelines, Wt be the sum total of the widths of all the fine grooves, A1 be the distance from the endpoint of the rounded portion of one scoreline of the adjacent scorelines to the fine groove formation region, A2 be the distance from the endpoint of the rounded portion of the other scoreline of the adjacent scorelines to the fine groove formation region, and Wmax be the maximum width of the widths of the fine grooves, 0≦A1+A2<Wmax+d, |A1−A2|<(Wmax+d)/4, and Wt+d×(N−1)+A1+A2=S.