Image Sensor Lens Array Specular Reflection for Adhesive Tape Detection
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Solution Overview
Problem
Existing banknote thickness detection apparatuses are bulky and inefficient, using numerous parts and occupying significant space, which hinders assembly efficiency and device miniaturization, when detecting whether a banknote surface is stuck to transparent adhesive tape.
Innovation Solution
An image sensor system with a first and second photosensitive assembly, light source assemblies, and lens arrays that aggregate light reflected and transmitted through the banknote, utilizing specular reflection to differentiate grayscale values and determine if a banknote is stuck to adhesive tape, along with a compact structure and pressing roller with a brush layer for enhanced detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a banknote thickness detection apparatus is used to detect whether the banknote surface is stuck to adhesive tape, then detection function is achieved, but the apparatus occupies large space and has low assembly efficiency
Solution Approach 1:
The patent combines multiple detection functions (thickness detection and adhesive tape detection) into a single integrated apparatus. The detection roller and sensor assembly are merged into one compact unit that can detect both banknote thickness and the presence of adhesive tape, thereby reducing the overall space required compared to separate detection devices.
Solution Approach 2:
The detection apparatus is designed with multi-functionality to perform both thickness measurement and adhesive tape detection using the same structural components. The sensor system can distinguish between different objects (banknote alone vs. banknote with adhesive tape) based on detection signals, eliminating the need for separate specialized devices.
2Measurement precision
If a banknote thickness detection apparatus with multiple parts is used, then detection accuracy is achieved, but assembly efficiency is reduced
Solution Approach 1:
The detection apparatus is divided into functional modules (light source assembly, lens array, photosensitive assembly, detection roller) that can be independently designed and assembled. This modular segmentation allows for standardized production and easier assembly while maintaining detection accuracy through optimized functional separation.
Solution Approach 2:
The patent employs a nested structure where the light source assembly, lens array, and photosensitive assembly are arranged in a compact nested configuration. The detection roller is positioned within the detection chamber, and components are layered to minimize space while maintaining functional integrity and detection precision.
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 solution allows for accurate detection of banknote adherence to adhesive tape based on image grayscale values, reducing the number of components and space requirements, enhancing assembly efficiency and facilitating device miniaturization.
Implementation Method 1
a light-entering surface of the lens array is located in a transmission path of reflected light generated due to specular reflection occurred when light emitted from the light source assembly irradiates on the banknote
Data Source
AI summary
An image sensor and a banknote processing apparatus are provided. The image sensor includes a first photosensitive assembly and a first light source assembly which is configured to irradiate light to an original, and further includes a first lens array configured to aggregate light reflected by the original to the first photosensitive assembly, and a light-entering surface of the first lens array is located in a transmission path of reflected light generated due to specular reflection occurred when light emitted from the first light source assembly irradiates on the original. According to different image grayscale values generated by the image sensor, the banknote processing apparatus judges whether a banknote surface is stuck to an adhesive tape.