Piezochromic Impact Structure for Accurate Line Calls
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Solution Overview
Problem
Current line-calling systems in sports, such as tennis, face challenges in accurately determining whether a ball is 'in' or 'out' due to limitations in existing technologies like Hawk-Eye, which can be distracting and occasionally erroneous, and other systems that suffer from issues like erosion or player aversion due to special treatments on tennis balls.
Innovation Solution
A variable-color object-impact structure that temporarily changes color upon impact, utilizing an electrode assembly with a core layer between near and far electrodes, allowing for accurate visual determination of impact location by changing color only at the impact area, reducing the need for challenges and minimizing distractions during play.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Hawk-Eye system is used for line calling, then measurement precision is improved, but device complexity and distraction to players increase
Solution Approach 1:
The patent extracts the line-calling function from the complex Hawk-Eye system and implements it through a simple piezochromic material embedded in the court surface. The material changes color when a ball impacts it, providing immediate visual feedback without requiring cameras, computers, or complex tracking systems. This eliminates the distraction of monitors and challenges while maintaining accuracy.
Solution Approach 2:
The piezochromic material performs the line-calling function autonomously through its inherent physical property of color change upon impact. The system requires no external power sources, control systems, or human intervention beyond the natural play of the sport. The material itself generates the visual signal that determines inbounds/outbounds status.
2Measurement precision
If special treatments are applied to tennis balls for line calling, then measurement precision is improved, but object-generated harmful factors increase due to erosion and player aversion
Solution Approach 1:
The patent introduces an intermediary substance (piezochromic material) embedded in the court surface that mediates the interaction between the ball and the line-calling system. Instead of modifying the ball itself, the material responds to ball impacts through color change, eliminating erosion of ball treatments and player aversion to modified balls while maintaining accurate impact detection.
3Measurement precision
If challenges are used to verify line calls, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The piezochromic material provides immediate, self-verifying line calls through instantaneous color change upon impact. There is no need for challenges or verification processes, as the material's physical response occurs in real-time during play. This eliminates the time loss associated with challenging calls while maintaining high precision through the material's reliable color-change mechanism.
4Measurement precision
If camera-based systems like Hawk-Eye are implemented, then measurement precision is improved, but ease of operation deteriorates due to distraction during play
Solution Approach 1:
The patent removes the complex camera-based monitoring system entirely and replaces it with a passive piezochromic material embedded in the court surface. The material provides continuous, real-time visual feedback without requiring players to look at monitors or officials to challenge calls. Play continues uninterrupted as the material automatically indicates inbounds/outbounds status through color change.
Solution Approach 2:
The piezochromic material operates autonomously during play, providing immediate visual feedback without requiring player attention, challenge mechanisms, or external monitoring systems. The system serves itself by using the ball's own impact to trigger the color change, eliminating distractions and maintaining ease of operation throughout the match.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution provides high accuracy in determining the location of impacts on a tennis court, significantly reducing the need for challenges and delays in line calls, and can be used in various sports, enhancing the efficiency and fairness of line calls.
Implementation Method 1
A piezochromic material changes color upon applying suitable pressure and returns to the original color upon releasing the pressure.
Data Source
AI summary
A variable-color region (106) of an information-presentation structure extends to an exposed surface (102) at a surface zone (112), normally appears along it as a principal color, and includes impact-sensitive and color-change components (182 and 184). A segment (192) of the impact-sensitive component responds to an object (104) impacting the zone at an object-contact area (116) by providing an impact effect if the impact meets threshold impact criteria. A segment (194) of the color-change component responds to the effect by causing an impact-dependent portion (138) of the variable-color region to temporarily appear along a print area (118) of the zone as changed color materially different from the principal color. The print area closely matches the object-contact area in size, shape, and location. The color-change component employs an electrode assembly (202) having a core layer (222) sandwiched between two electrode structures (224 and 226) for controlling the color change.