Bill Authenticity Sensor Black Calibration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The light receiving sensor in bill processing apparatuses can deteriorate over time and be affected by environmental changes, leading to inaccurate authentication of paper sheets, potentially identifying legitimate bills as fake due to variations in output values.
Innovation Solution
Incorporating a black calibration process that sets a reference value for the lowest brightness before each authenticity judgment, using a light receiving part to convert light into pixel data with color information, and comparing this data with reference pixel data to ensure accurate authentication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the light receiving sensor is used continuously without recalibration, then the device operation is simple and fast, but the measurement precision deteriorates due to environmental changes and sensor deterioration
Solution Approach 1:
The system performs black calibration before each authenticity judgment to pre-adjust the reference value, ensuring the light receiving sensor is properly calibrated before measurement. This preliminary action compensates for environmental changes and sensor deterioration, maintaining measurement precision without requiring complex post-calibration procedures
Solution Approach 2:
The system automatically detects paper sheet insertion and triggers black calibration in response, creating a feedback loop that maintains calibration accuracy. The control unit monitors sensor signals and initiates recalibration when needed, balancing measurement precision with operational simplicity through automated decision-making
2Measurement precision
If black calibration is performed frequently, then the measurement precision is maintained, but the productivity decreases due to additional processing time
Solution Approach 1:
The system performs black calibration periodically based on paper sheet insertion events rather than continuously or at fixed time intervals. This periodic recalibration maintains reference value accuracy while minimizing interruptions to bill processing flow, optimizing the balance between precision and productivity
Solution Approach 2:
The system automatically performs black calibration without requiring manual intervention or stopping the main processing flow. The control unit manages the calibration process autonomously, allowing the system to self-correct reference values while maintaining operational efficiency and minimizing impact on productivity
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 approach ensures accurate authenticity judgments even with environmental changes, such as temperature fluctuations, by correcting output values and preventing false identifications of legitimate bills as counterfeit.
Implementation Method 1
a light emitting part irradiating the bill moving in a bill traveling route with light and a light receiving sensor receiving transmitted light and reflected light of the light irradiated by the light emitting part
Data Source
AI summary
A paper sheet processing apparatus includes: an insertion slot through which a paper sheet is inserted; a sensor which detects insertion of the paper sheet; a traveling route through which the paper sheet is conveyed; a light emitting part which irradiates the traveling route with light; a light receiving part which receives light from the traveling route; a black calibration part which sets a reference value for the lowest brightness in a state that the emission of the light emitting part is ineffective; and an authenticity judgment processing part which judges an authenticity. The black calibration part can set the reference value before the authenticity judgment processing part judges the authenticity after the sensor detects the insertion of the paper sheet at every time when the paper sheet is inserted.