Static Electricity Foreign Object Detection on Sheet Media
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Solution Overview
Problem
Conventional mechanical contact-type thickness identification devices for detecting foreign substances on banknotes are costly due to high manufacturing precision requirements and often miss detections due to manufacturing volume gaps, leading to reduced identification rates.
Innovation Solution
A device utilizing static electricity, comprising a static electricity providing part, a medium transporting part with static electricity receiving and absorbing units, and a sensing and identifying part, which generates and analyzes static electricity virtual images to detect foreign substances on sheet-type media without mechanical contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical contact-type thickness identification method is used, then foreign substances can be detected, but manufacturing cost increases due to high precision requirements
Solution Approach 1:
The patent replaces the mechanical contact-type thickness identification system with a static electricity-based detection system. Instead of using mechanical rollers and sensors that require high precision manufacturing, the invention uses static electricity providing shafts, receiving shafts, and sensing components that detect foreign substances through electrostatic field interactions, thereby reducing manufacturing precision requirements and cost while maintaining detection capability
Solution Approach 2:
The invention changes the detection parameter from mechanical thickness measurement to static electricity field interaction. By using static electricity providing shafts to generate electrostatic fields and receiving shafts to detect changes in these fields caused by foreign substances, the system achieves detection without the high mechanical precision requirements of traditional methods
2Reliability
If multiple driven components are used, then detection coverage increases, but gaps between components cause missed detections
Solution Approach 1:
The patent replaces the mechanical roller system with static electricity providing and receiving shafts that create overlapping electrostatic field zones. This field-based approach eliminates the physical gaps between discrete mechanical components, ensuring continuous detection coverage across the entire banknote surface without missed detections
Solution Approach 2:
The invention uses multiple static electricity providing shafts and receiving shafts arranged to create overlapping detection zones. This redundant arrangement ensures that any foreign substance on the banknote surface will be detected by at least one shaft pair, compensating for potential detection blind spots and maintaining high identification rates
3Measurement precision
If mechanical contact method is used, then thickness traces can be identified, but manufacturing precision requirements are extremely stringent
Solution Approach 1:
The patent substitutes the mechanical contact measurement system with a static electricity field-based detection system. The providing shafts generate electrostatic fields that interact with foreign substances on the banknote, and the receiving shafts detect these interactions through changes in electrostatic capacity or field distribution, achieving precise foreign substance detection without requiring high machining precision of mechanical components
Solution Approach 2:
The invention changes the measurement parameter from mechanical thickness variation to electrostatic field interaction characteristics. By measuring changes in static electricity distribution patterns when foreign substances are present, the system achieves detection precision without the stringent manufacturing precision requirements of mechanical contact methods
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
Enables rapid identification of foreign substances on sheet-type media with reduced manufacturing costs and improved detection accuracy, avoiding the limitations of mechanical contact methods.
Implementation Method 1
a static electricity providing part for providing static electricity charges; The static receiving unit is configured to transfer static electricity charges obtained from the static electricity providing part to a medium to be detected
Implementation Method 2
The static electricity absorbing unit is configured to absorb the static electricity charges of the medium to be detected
Data Source
AI summary
A device for detecting a foreign object attached on a surface of a sheet-like medium, comprising a static electricity providing part (A) for providing static electrical charges, a medium transporting part (B) for transporting a medium under detection, and a static electricity sensor and identifier part (C). The medium transporting part comprises a static electricity receiving unit and a static electricity absorbing unit sequentially connected. The static electricity receiving unit is connected to the static electricity providing part (A), and the static electricity absorbing unit is connected to the static electricity sensor and identifier part (C). The static electricity receiving unit is configured to transfer the static electrical charges obtained from the static electricity providing part (A) to the medium under detection. The static electricity absorbing unit is configured to absorb the static electrical charges of the medium under detection.