Optical Grid Pattern for Smart Card Surface Defect Detection

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Solution Overview

Problem

Existing smart card fabrication processes face challenges in ensuring consistent physical properties and standard compliance, leading to variations in card quality and potential defects that can affect their functionality and longevity.

Innovation Solution

A system and method utilizing a grid or graphic pattern to optically accentuate surface features, allowing for comprehensive quality assurance and defect identification before large-scale production, thereby reducing testing time and costs while ensuring compliance with industry standards.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If traditional quality assurance methods are used for smart card fabrication, then manufacturing processes can be completed, but variations in physical properties and defects occur leading to inconsistent card quality

Engineering Contradiction:

Improvecard physical property consistencyVSAvoidcard functionality and longevity

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

The patent applies preliminary action by implementing quality assurance testing before volume manufacture. The method identifies deformations and defects in card blanks prior to production, allowing corrective measures to be taken before defective cards are manufactured. This prevents variations in physical properties and ensures consistent card quality, resolving the contradiction between manufacturing precision and reliability.

Inventive Principle:

Principle #10Preliminary action

2Measurement precision

If comprehensive quality testing is performed across the entire card surface, then defect identification improves, but testing time and costs increase

Engineering Contradiction:

Improvedefect identification accuracyVSAvoidtesting time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent replaces manual or mechanical inspection methods with an optical system that uses a grid pattern overlay. This optical system automatically detects deformations and defects across the entire card surface, providing comprehensive measurement precision without the time consumption of manual inspection. The optical detection method maintains high defect identification accuracy while significantly reducing testing time.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Measurement precision

If comprehensive quality testing is performed across the entire card surface, then defect identification improves, but testing costs increase

Engineering Contradiction:

Improvedefect identification accuracyVSAvoidtesting cost

Core Design Contradiction:

Measurement precisionVSEase of manufacture

Solution Approach 1:

The patent replaces expensive manual inspection processes with an automated optical detection system. The grid pattern overlay method uses simple optical components to detect deformations, eliminating the need for costly manual labor while maintaining high measurement precision. This substitution reduces testing costs while improving defect identification accuracy.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

4Strength

If pressure is increased during lamination to ensure proper bonding, then card assembly improves, but antenna breakage occurs rendering contactless feature useless

Engineering Contradiction:

Improvecard assembly bondingVSAvoidcontactless functionality

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The patent applies preliminary action by testing card blanks and identifying potential antenna vulnerabilities before the lamination process. The quality assurance method detects deformations that could lead to antenna breakage during pressing, allowing adjustments to be made before actual production. This ensures proper card assembly bonding while preventing contactless functionality loss.

Inventive Principle:

Principle #10Preliminary action

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

The solution enables efficient and cost-effective quality assurance across the entire card surface, reducing the likelihood of defective cards and improving standard compliance, ensuring reliable and functional smart cards.

Implementation Method 1

The grid or similar graphic enables a generic test that checks the quality across the whole card

Methodology Applied

Scientific EffectOptical diffraction: Diffraction

Implementation Method 2

use a grid or similar graphic to optically accentuate card surface feature or deformations

Methodology Applied

Scientific EffectOptical reflection: Reflection

Data Source

PatentUS8910867B2System and method for card quality assurance

Publication Date: 2014.12.16 MASTERCARD INT INC

AI summary

A system and method for payment card quality assurance is provided. The system and method use a grid or similar graphic to optically accentuate card surface deformations in test cards. The grid enables a generic test that checks the quality across the whole card surface. Process card monitors with the grid pattern can be used to qualify card-manufacturing processes.