Lighting for the standard-compliant reading and verification of codes
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Lighting for the standard-compliant reading and verification of codes - 1

POWER LIGHTS FOR MACHINE VISION 6. Lighting systems for the standards-compliant reading (validation) and verification of codes In tomorrow’s state-of-the-art, fully automated facilities, products control their own manufacturing process. Influence of the lighting angle With the aid of machine-readable product labelling, innovative tracking procedures enable the optimisation of manufacturing processes, machine capacity utilisation, costs and product quality. Yet the vision of ‘Industry 4.0’ depends crucially on the communication between product and machine. Only a high-quality product code can guarantee a smooth, error-free flow of information. Thanks to Machine Vision-based code verification, potential problems are resolved before they even occur. In a ‘smart’ factory, the products communicate directly with the Reading machinery. Via its product code, the product itself tells the system Simple code reading which step must be performed next. And thanks to the information obtained, the complete production process can be tracked for each Standardised reading (validation or grading) Objective evaluation of code quality without strict adherence to standards individual product. This ensures optimal process flow control. Nor does the versatility of product label applications stop at process optimisation and quality inspection: a Data Matrix Code can also be used to provide the end user with all of the information that they require. Product Checking of code quality using standardised procedures and parameters according to international standards traceability is another area that is now increasingly important – such as for combating counterfeit pharmaceutical products, for example. Optical filters Direct Part Marking (DPM) procedure ■ ■ ■ ■ Dot peen marker Laser marker Scribe marker Electrolytic marker (etching) ■ Inkjet Yet the proper functioning of these kinds of systems is dependent on the reliability of product code scanning. Direct Part Marking (DPM) codes are especially durable and long-lasting. With DPM technology, the machine-readable code is marked directly and permanently on the product. Additional product labels are no longer necessary. The quality of the code is then verified using standardised procedures: ideally, this takes place in the plant Fluorescence applications directly after marking and then whenever the mark could be later affected. Trend analysis is used to ensure that the marking process proceeds without errors at all times. If the quality of a marking system starts to decline, this problem can be caught early before the mark actually becomes illegible. Right from the outset, this avoids time-consuming rework – or scrapping, in the worst case. The verification procedure guarantees the 100% legibility of the code throughout the entire production process – and beyond. To execute the reading and verification process in line with the standards, the lighting situation is determined alongside camera and software factors. Lighting systems for the reading and verification of codes A standard-compliant set-up usually requires a 90° viewing angle for the camera and thus the camera must be positioned vertically to the test piece. Lighting technology for shape-fromshading Changes to this viewing angle would cause axial unevenness in the code and thus lead to a poor result in the quality assessment. Data Matrix code code correctly imaged at a 90 ° viewing angle LUMIMAX Knowledge Base Chapter 6 Lighting systems for the reading and verification of codes code skewed by a chang

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Lighting for the standard-compliant reading and verification of codes - 2

POWER LIGHTS FOR MACHINE VISION 6. Lighting systems for the standards-compliant reading (validation) and verification of codes Influence of the lighting angle The standards The standards ISO/IEC 15415:2011/ 15416:2016 and ISO/IEC 29158:2020 are particularly interesting when it comes to the standard-compliant reading and verification of codes. ISO/IEC 15415:2011/ 15416:2016 ISO standard 15415:2011/ 15416: 2016 relates to printed codes on labels and similar. ISO/IEC 29158:2020 Optical filters Fluorescence applications Lighting systems for the reading and verification of codes In contrast, the...

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Lighting for the standard-compliant reading and verification of codes - 3

POWER LIGHTS FOR MACHINE VISION 6. Lighting systems for the standards-compliant reading (validation) and verification of codes Depending on the material and shape of the test piece, a suitable version can be determined here: Influence of the lighting angle ■ plane, matt and rough surfaces: four-sided lighting arrangement ■ curved and rotationally symmetrical surfaces: two- or one-sided lighting arrangement ■ glossy and reflective surfaces: Coaxial or dome lighting ■ glossy surfaces with a complex structure: Dome lighting Standard-complaint set-up Off-axis diffuse „D“ Norm ISO/IEC 29158:2020...

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Lighting for the standard-compliant reading and verification of codes - 4

POWER LIGHTS FOR MACHINE VISION 6. Lighting systems for the standards-compliant reading (validation) and verification of codes Influence of the lighting angle Optical filters Simple integration The lighting system and its setup for the test object is an important factor for the standards-compliant reading and verification of codes. To ensure the standards-compliant, reproducible and simple integration of lighting into the plant environment, customers can rely on the LUMIMAX® Mounting Systems. One interesting option for mounting a coaxial or dome lighting system is offered by the LUMIMAX®...

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