The rapid iteration of electronic products has generated massive demand for PCBs. In pursuit of higher production output, many manufacturers compromise on quality control, typically adopting batch-based management solutions. When defects occur in boards, entire production batches must be recalled for inspection—not only causing significant waste of corporate manpower and material resources, but also inflicting substantial harm to both businesses and consumers. To address this challenge, PCB traceability systems have emerged as a critical solution. These systems penetrate deep into the PCB industry, ensuring product safety through comprehensive quality control—from internal manufacturing processes to external supply chain tracking—safeguarding every step of the production and distribution chain.
PCB manufacturers must establish full traceability by associating solder paste printing quality pre-reflow placement quality and post-reflow assembly quality with individual PCBs across production stages (SPI pre-reflow AOI and post-reflow AOI).
The barcode scanning module must reliably decode PCB-mounted 2D codes with the following specifications:
Code Standards: QR Code & Data Matrix (DM)
Code Dimensions: ≤10×10mm (variable sizes)
FOV (Field of View): Max. 65×50mm
Dynamic Decoding: Capable of real-time scanning at conveyor speeds ≥50mm/s
Working Distance: 80–100mm
Key Performance Requirements:
High-speed & high-accuracy reading (>99.9% first-pass rate)
Fully automated contactless operation
Contamination-free & stable recognition
Industrial-grade robustness for SMT environments
Customer Pain Points：
Requires reading multiple small codes within a wide field of view, with simultaneous presence of QR codes and Data Matrix (DM) codes. Additionally, QR codes on PCB boards are not coplanar, making them unreadable by a single code reader and necessitating multiple readers, which increases costs. After decoding, the data is uploaded to the MES (Manufacturing Execution System) to enable full-process tracking of product status and establish one-to-one data correlation.
Project Challenges:
Challenges in Achieving Accurate and Stable Code Reading During PCB Production:
1.Large Scanning Field with Small, Varied-Size 2D Codes
The PCB's large scanning area contains numerous small 2D codes of inconsistent sizes, significantly increasing reading difficulty.
2.Component-Obstructed Codes
Some QR codes are partially or fully blocked by mounted components, requiring advanced imaging solutions.
3. Multi-Plane Code Recognition
Codes distributed across different height planes demand high depth-of-field reading capabilities.
Solution:
Featuring an expanded field of view (FOV) and the capability to handle a high volume of product barcodes, enabling large-area scanning of multiple barcode types. Equipped with high-precision AI algorithms for accurate reading of various barcodes and QR codes, unaffected by smudges, damage, or other interferences. Incorporates the industry's latest liquid lens technology to resolve decoding challenges across non-coplanar surfaces.
Model selection:
The barcode reader is mounted above the conveyor at the post-reflow station. The conveyor transports PCB boards into the reader's scanning area, where the device identifies all QR codes on the PCBs. The decoded data is then uploaded to the MES (Manufacturing Execution System) and correlated with scan results from other station readers for traceability.
Recommended model: R-5350 (Quantity: 1 unit).
Advantages:
High-precision MIL-grade hardware and software effortlessly decode ultra-small barcodes.
Industry-leading AI algorithms ensure accurate and efficient reading of damaged or low-quality codes.
Liquid autofocus lens enables faster and more precise focusing, delivering sharper imaging with automatic adjustment for simplified set up.
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