Multifeed Sheet Detection Using Transmission and Reflection Light
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Solution Overview
Problem
Existing multifeed detection systems struggle to accurately distinguish between single and multiple overlaid sheets, particularly when soiled notes are involved, due to variations in light transmission levels.
Innovation Solution
A multifeed detection device utilizing a light source and a light receiver to capture both transmission and reflection light data, employing a controller to analyze these data using machine-learned functions to determine the occurrence of multifeed based on both transmission and reflection output data, enhancing accuracy through pixel-level analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If only transmission light detection is used, then the device complexity is reduced, but the measurement precision deteriorates due to inability to distinguish soiled notes from multifeed
Solution Approach 1:
The patent combines transmission light detection and reflection light detection into a single integrated detection system. The light receiver includes both transmission light receiving pixels and reflection light receiving pixels that work simultaneously to detect multifeed conditions, merging two detection methods into one unified device to improve measurement precision without proportionally increasing complexity.
Solution Approach 2:
The patent adds reflection light detection as an additional dimension to the traditional transmission light detection method. By incorporating reflection light receiving pixels alongside transmission light receiving pixels, the system creates a multi-dimensional detection approach that provides more information for distinguishing soiled notes from multifeed conditions, thereby improving measurement precision.
2Measurement precision
If transmission light and reflection light detection are both used, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The light receiver is designed as a multi-functional device that can perform both transmission light detection and reflection light detection using the same basic structure. The light receiver includes multiple types of light receiving pixels (transmission and reflection) that can operate together, making the device universal and reducing the need for separate detection systems, thereby limiting the increase in device complexity.
3Measurement precision
If machine-learned functions are used for analysis, then the measurement precision is improved through pixel-level analysis, but the use of energy increases due to complex computations
Solution Approach 1:
The patent applies machine-learned functions that have been pre-trained and stored in the detection device. The complex computational work of training the machine learning model is performed in advance, and during actual multifeed detection, the pre-trained model performs faster inference with lower energy consumption, thus improving measurement precision while limiting real-time energy usage.
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 system provides more precise detection of multifeed by considering both transmission and reflection light data, reducing erroneous detections and improving accuracy even with soiled notes, regardless of sheet type or pattern.
Implementation Method 1
a light source configured to irradiate a sheet with light
Implementation Method 2
a light receiver configured to receive transmission light transmitted through a sheet and reflection light reflected by a sheet
Data Source
AI summary
A multifeed detection device according to the present disclosure includes: a light source configured to irradiate a sheet with light; a light receiver configured to receive transmission light transmitted through a sheet and reflection light reflected by a sheet; and a controller configured to acquire, from the light receiver, transmission output data that is output data of the transmission light and reflection output data that is output data of the reflection light, the controller being configured to determine whether or not a multifeed of sheets has occurred based on the transmission output data and the reflection output data.