Golf Club Face Line Geometry for Spin and Ball Protection
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Solution Overview
Problem
Golf club face lines enhance spin performance but can damage the ball and reduce control due to sharp edges, and existing designs struggle to balance spin performance with ball protection, especially in wet conditions and rough terrain.
Innovation Solution
A golf club head with face lines having specific geometric features, including a radius of 0.01 to 0.10 mm and a groove angle between 40 to 70 degrees, designed to minimize ball damage while maintaining spin performance by ensuring smooth continuous edges and effective dischargeability of water and debris.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If face lines have sharp edges to increase spin amount, then spin performance is improved, but ball damage increases
Solution Approach 1:
The invention changes the geometric parameters of the face line section shape, specifically defining precise relationships between points at different depths (Pa at surface, Pb at D1/4, Pc at D1/2, Pd at 3D1/4) with controlled radius R3 (0.01-0.10mm) and angle θm (40-70 degrees). This parameter optimization allows the face line to generate sufficient spin while the rounded geometry prevents ball damage.
Solution Approach 2:
The invention applies curvature by defining a specific radius R3 for the circle passing through points Pa, Pb, and Pc, and controlling the groove angle θm. This curvature replaces sharp edges with rounded profiles, maintaining the spin-generating capability of face lines while eliminating the harmful sharp edges that cause ball damage.
2Ease of operation
If face lines are used to suppress flier in rough conditions, then control is improved, but ball damage increases due to grass cutting action
Solution Approach 1:
The invention optimizes the section shape parameters including radius R3 (0.01-0.10mm) and angle θm (40-70 degrees) to achieve a balance where the face line is effective at cutting grass to suppress flier, while the controlled geometry prevents excessive ball damage. The smooth continuous section line between Pa and Pd further reduces damage.
3Object-affected harmful factors
If face lines have specific geometric features to reduce ball damage, then ball protection is improved, but spin performance may be reduced
Solution Approach 1:
The invention carefully selects and optimizes the parameter ranges: radius R3 between 0.01-0.10mm and angle θm between 40-70 degrees. These specific ranges were determined to provide the optimal balance, where the rounded geometry (controlled by R3) protects the ball while the groove angle (θm) maintains sufficient spin generation capability.
Solution Approach 2:
By implementing controlled curvature through the radius R3 definition and smooth continuous section line requirement, the invention creates a face line geometry that is rounded enough to protect the ball but maintains the structural features necessary for spin generation through the optimized angle θm.
Data Source
AI summary
A head 2 has a face line 8 having a depth of D1 (mm). In a section line of a surface of the face line 8, a boundary between a land area LA and the face line 8 is defined as a point Pa; a point of which a depth is [D¼] (mm) is defined as a point Pb; a point of which a depth is [D½] (mm) is defined as a point Pc; a point of which a depth is [(D1)×(¾)] (mm) is defined as a point Pd; a radius of a circle CL1 passing through three points of the point Pa, the point Pb, and the point Pc is defined as R3 (mm); a straight line passing through the point Pc and the point Pd is defined as a straight line Lcd; a straight line perpendicular to the land area LA is defined as a straight line Lp; and an angle between the straight line Lcd and the straight line Lp is defined as θm. At that time, the radius R3 is 0.01 (mm) or greater and 0.10 (mm) or less, and the angle θm is 40 degrees or greater and 70 degrees or less.