Paper Sheet Recognition Using Dual-Angle Line Sensor
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Solution Overview
Problem
Conventional paper sheet recognition technologies for motion threads are bulky and costly due to the need for multiple light-receiving elements and complex optical systems, making them inefficient for accurately and swiftly identifying the presence of motion threads.
Innovation Solution
A compact paper sheet recognition apparatus using a single line sensor and dual light sources irradiating the paper sheet from different directions, with a light source controller and image processing unit to capture and compare images, determining the presence of a motion thread by analyzing differences in thread images captured from varying angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple light-receiving elements and complex optical systems are used for motion thread recognition, then measurement precision is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines multiple light-receiving elements into a single line sensor that can detect reflected light from the motion thread. The line sensor integrates the function of multiple photoreceivers into one component, reducing device complexity while maintaining the ability to capture optical information from different directions for accurate motion thread recognition.
Solution Approach 2:
The line sensor serves multiple functions: it detects reflected light from the motion thread, captures images from different viewing angles, and provides data for authenticity judgment. This multi-functional design eliminates the need for separate specialized sensors for each function, thereby reducing overall device complexity.
2Measurement precision
If multiple light-receiving elements are used to measure reflected lights, then measurement precision is improved, but manufacturing cost increases
Solution Approach 1:
The patent merges multiple light-receiving elements into a single line sensor, significantly reducing the number of components that need to be manufactured and assembled. This consolidation maintains the capability to measure reflected lights from multiple directions while dramatically lowering manufacturing costs associated with producing and integrating multiple separate sensors.
Solution Approach 2:
Instead of using multiple expensive light-receiving elements, the patent employs a single line sensor that can capture optical information equivalent to what multiple sensors would provide. The line sensor creates a simplified copy of the multi-sensor system's functionality, reducing component costs while maintaining measurement capabilities.
3Measurement precision
If an optical system such as SLA is required between light receiving element and paper sheet, then measurement precision is improved, but device complexity and size increase
Solution Approach 1:
The patent integrates the optical detection function directly into the line sensor, eliminating the need for separate complex optical systems like SLA between the light-receiving element and the paper sheet. The line sensor is positioned to directly receive reflected light from the motion thread, simplifying the overall optical path while maintaining detection accuracy.
Solution Approach 2:
The patent extracts the optical detection function from the complex optical system and concentrates it into the line sensor. By taking out the essential light-receiving capability and placing it in a single, simpler component, the patent eliminates the need for intermediate optical systems like SLA, thereby reducing device complexity and size.
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 accurate and rapid recognition of motion threads with reduced size and manufacturing cost, utilizing a single line sensor and dual light sources to capture and compare images, effectively addressing the inefficiencies of conventional methods.
Implementation Method 1
a line sensor that receives a reflected light reflected from the paper sheet that is being transported by the transport mechanism and that is irradiated with the lights from the first direction and the second direction
Data Source
AI summary
A paper sheet recognition apparatus recognizes whether a paper sheet has a motion thread that is a thread part in which a pattern varies with a viewing angle. The paper sheet recognition apparatus includes multiple light sources that irradiate the paper sheet with lights from corresponding multiple directions, a line sensor that receives reflected light reflected from the paper sheet that is irradiated with the lights from the multiple directions by the light sources, an image processing unit that creates, based on an output signal that is outputted by the line sensor, multiple paper sheet images captured by using the light irradiated by the light source from each direction, and a recognition unit that judges whether the motion thread is present by comparing each image of the thread part included in each of the paper sheet images created by the image processing unit.