Golf Ball Guide Mark Geometry for Accurate Swing Alignment
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Solution Overview
Problem
Existing golf ball guide marks are straight in plan view, leading to misperception during a swing and inadequate adjustment of swing trajectory.
Innovation Solution
The golf ball incorporates a guide mark that is distorted in plan view but perceived as undistorted in the player's sight line, utilizing anamorphosis to facilitate accurate swing trajectory adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a straight guide mark is used on a spherical golf ball, then the mark is easy to manufacture, but the player perceives it as curved during swing and cannot accurately adjust swing trajectory
Solution Approach 1:
The guide mark is designed with an asymmetric distorted shape in plan view, where the distortion compensates for the curvature effect when viewed from the player's sight line during swing. The mark appears curved in top view but straightens out when projected onto the player's visual field, enabling accurate trajectory alignment.
Solution Approach 2:
The guide mark design transitions from a two-dimensional straight line in plan view to a three-dimensional visual perception that appears straight on the spherical surface during swing. The distortion in plan view creates a mark that, when wrapped around the sphere, presents a straight appearance to the player's eye during the swing motion.
2Ease of operation
If a distorted guide mark is used to appear straight during swing, then swing trajectory adjustment is improved, but the mark shape becomes complex in plan view
Solution Approach 1:
The guide mark employs asymmetric distortion in its plan view geometry, deliberately deviating from a straight line configuration. This asymmetric shape is calculated to counteract the visual curvature effect, creating a mark that appears straight and uniform when viewed by the player during the swing motion.
Solution Approach 2:
The guide mark's geometric parameters are modified from a standard straight line configuration. The distortion degree, curvature radius, and positional parameters are specifically adjusted so that when the mark is applied to the spherical surface and viewed from the player's sight line, it presents a straight appearance for accurate swing alignment.
Data Source
AI summary
A golf ball includes an assist mark 10 and a guide mark. The assist mark is straight in plan. The guide mark is distorted in plan. The guide mark is in the shape of an arrow as a whole. The guide mark looks straight to a player swinging a golf club. The player moves the head of the golf club along the direction of the guide mark.