Transparent Object Quality Control with Reflector and Dynamic Lighting
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Solution Overview
Problem
Existing quality control systems for transparent objects, such as container glasses, face challenges in accurately detecting contamination and structural deviations due to complex shapes, leading to false positive or false negative results.
Innovation Solution
A device and method utilizing a reflector placed between the object and the light source and image acquisition device, with a variable distance and adjustable beam path, combined with dark field illumination and multiple light sources, to enhance image contrast and differentiate between refracting structures and contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a transmission test with diffuse lighting is used for quality control, then the system is simple to operate, but the measurement precision deteriorates due to false positive or false negative results from complex structural elements
Solution Approach 1:
The patent employs dynamic control of the light source, switching between diffuse lighting and structured lighting patterns (such as line lights or point lights) depending on the inspection requirements. This dynamic adaptation allows the system to maintain ease of operation while achieving high measurement precision by selecting the appropriate lighting mode for different inspection scenarios
Solution Approach 2:
The system changes lighting parameters including the spatial distribution of light (from diffuse to structured), the wavelength of light, and the intensity distribution. By varying these parameters, the system can differentiate between actual defects and structural elements, thereby improving measurement precision without complicating the operation
2Shape
If structured elements are present on the object surface, then the object has functional structural features, but the reliability of defect detection deteriorates due to false positive or false negative results
Solution Approach 1:
The patent segments the lighting into multiple independent light sources or light patterns that can be individually controlled. By using multiple line lights or point lights at different positions and angles, the system can selectively illuminate different regions and differentiate between structural elements and defects, thereby improving detection reliability
Solution Approach 2:
The system introduces reference markers or calibration patterns as intermediaries between the light source and the object. These intermediaries help distinguish between actual defects and structural elements by providing known reference points for comparison, thereby enhancing the reliability of defect detection
3Measurement precision
If multiple light sources and adjustable beam paths are used, then the measurement precision improves, but the device complexity increases
Solution Approach 1:
The patent designs the lighting system with multi-functional components that can serve multiple purposes. For example, the same light source can function both as a diffuse illuminator and as a structured light projector by changing the optical elements or control modes. This universality reduces the need for separate dedicated components, thereby limiting the increase in device complexity while maintaining high measurement 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 improves the reliability of quality control by compensating for structural elements, increasing contrast, and allowing for accurate differentiation between defects and contamination, even in complex-shaped objects.
Implementation Method 1
at least one light source (3) which is set up to illuminate the object (5)
Implementation Method 2
the apparatus also having at least one reflector (6), the object (5) being placeable between the reflector (6) on the one hand and the image acquisition device (2) and the light source (3) on the other hand
Implementation Method 3
at least one image acquisition device (2) with which at least one image of the object (5) can be acquired
Data Source
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AI summary
The invention relates to a device (1) for quality control of transparent objects (5), comprising at least one light source (3, 7) configured to illuminate the object (5) and at least one image acquisition device (2) with which at least one image of the object (5) can be acquired, wherein the device further comprises at least one reflector (6), and wherein the object (5) can be positioned between the reflector (6) on the one hand and the image acquisition device (2) and the light source (3) on the other. The invention further relates to a corresponding method for quality control of transparent objects.