Bill Authenticity Judgment Using Dynamic Reference Calibration
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Solution Overview
Problem
Conveyor rollers in bill processing apparatuses can have manufacturing errors, leading to inaccuracies in bill length detection and reduced authenticity judgment accuracy due to deviations in conveyance distance per pulse.
Innovation Solution
A paper sheet processing apparatus that includes an insertion slot, a conveyor member, a reading mechanism to measure the actual length of the paper sheet, and a storage system to compare this measurement with a reference value, allowing for adjustments to the reference value based on actual measurements to account for potential manufacturing errors in the conveyor rollers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conveyor roller with manufacturing errors is used, then the device can be manufactured with standard precision, but the bill length detection accuracy deteriorates
Solution Approach 1:
The system performs a calibration process where a reference bill is read to obtain actual length information, and this information is fed back to adjust the reference data in the dictionary. This feedback mechanism compensates for conveyor roller manufacturing errors by adapting the reference values to match actual measurements, thereby maintaining bill length detection accuracy despite hardware imperfections.
Solution Approach 2:
The invention changes the reference parameter values in the dictionary data by adjusting them based on actual measurements from reference bills. Instead of using fixed theoretical values, the system updates the reference length parameters to reflect real-world conditions, effectively compensating for conveyor roller dimensional errors and maintaining accurate authenticity judgment.
2Ease of operation
If the reference value is fixed without adjustment, then the system is simple to operate, but the authenticity judgment accuracy deteriorates due to conveyor errors
Solution Approach 1:
The system performs a preliminary calibration action during setup, where a reference bill is read and the actual length information is used to adjust the reference data. This preliminary action establishes corrected reference values that account for conveyor roller errors, allowing the system to maintain high reliability without requiring complex ongoing adjustments during normal operation.
Solution Approach 2:
The system performs self-calibration by automatically reading a reference bill and adjusting its own reference data without external intervention. This self-service capability allows the system to compensate for hardware errors autonomously, maintaining authenticity judgment accuracy while keeping the user interface simple and the operation straightforward.
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 ensures accurate authenticity judgments even when conveyor rollers have manufacturing errors, improving the reliability of bill processing apparatuses by dynamically adjusting reference values to match actual measurements.
Implementation Method 1
irradiating the paper sheet moving along the paper sheet travelling route with light, having a light receiving sensor detect the transmitted light and reflected light from the paper sheet
Implementation Method 2
irradiating the paper sheet moving along the paper sheet travelling route with light, having a light receiving sensor detect the transmitted light and reflected light from the paper sheet
Data Source
AI summary
A paper sheet processing apparatus which can accurately determine whether the paper sheet is legitimate or not even if a conveyor member has a manufacturing error. The apparatus includes: a conveyor roller to convey the paper sheet inserted into an insertion slot; a paper sheet reader to read the paper sheet; a detector to detect an actual measurement value in the predetermined area along a traveling direction of the paper sheet; a storage to store a reference value of length; and an authenticity judgment part to judge the authenticity of the paper sheet based on a comparison of the actual measurement value and the reference value. The reference value is determined based on length calculated by reading a legitimate paper sheet, a theoretical value of the length in the predetermined area, and a predetermined tolerant value for a legitimate paper sheet.