Golf Club Head Score Lines With Unequal Convex Portions for Spin
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Solution Overview
Problem
Existing golf club head designs do not effectively enhance the spin performance of the face portion, particularly in iron, short iron, and wedge types, despite the use of score lines.
Innovation Solution
A golf club head design featuring score lines with alternating convex portions of varying dimensions and concave portions to improve spin performance and drainage, including convex portions with different projecting heights and widths, and concave portions to enhance drainage, thereby stabilizing spin performance across the striking surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If score lines are formed on the face portion, then spin performance is improved, but the spin performance of the face portion still has room for improvement
Solution Approach 1:
The face portion is segmented into multiple functional elements: score lines extending in the toe-heel direction, and convex portions positioned between adjacent score lines. This segmentation allows each element to contribute differently to spin performance, with the convex portions providing additional spin enhancement without interfering with the score line function.
Solution Approach 2:
Different regions of the face portion are given different properties: score lines provide baseline spin, while convex portions with varying projecting heights and widths provide enhanced spin in specific locations. The convex portions have non-uniform dimensions (first convex portion has different projecting height and/or width compared to the second convex portion) to optimize spin generation at different striking positions.
2Reliability
If convex portions with varying dimensions are formed, then spin performance is enhanced, but manufacturing complexity increases
Solution Approach 1:
The convex portions are designed with varying parameters (projecting height and width in the orthogonal direction) where the first convex portion has different dimensions compared to the second convex portion. This parameter variation optimizes spin performance across different striking positions while maintaining a relatively simple geometric form that can be manufactured using conventional processes.
Data Source
AI summary
The golf club head includes a face portion, a plurality of score lines formed in the face portion and extending in a toe-heel direction, and a plurality of convex portions formed in the face portion, projecting from reference plane which includes edges of each of the plurality of score lines, and extending in the toe-heel direction. The plurality of convex portions include a first convex portion and a second convex portion formed between adjacent score lines. A projecting height of the first convex portion and/or a width in an orthogonal direction of the toe-heel direction of the first convex portion is larger than that of the second convex portion.