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What is AOI?
What is AOI used for?
How does an AOI inspection work?
Short & simple explanation:
AOI (Automated Optical Inspection) is an automated optical inspection process for quality control of assembled printed circuit boards.
What is AOI?
AOI (Automated Optical Inspection) is an automated inspection process used in electronics manufacturing to check components and solder joints for defects. Assembled components are automatically inspected using cameras and image processing technologies. They scan the printed circuit board and compare the images captured with a target template to detect possible defects such as solder joint problems, missing components, short circuits, or incorrect component placement. The goal of AOI is to identify defects early on in order to ensure product quality and minimize scrap. It is a fast and efficient method.
What is AOI used for?
An AOI system is used in electronics manufacturing to ensure the quality of printed circuit boards during the production process.
It is primarily used in the following situations:
- After component placement: Once the components have been placed on the printed circuit board, the AOI checks whether they are all correctly positioned and that no components are missing or incorrectly oriented.
- Before soldering: To ensure that the components are correctly positioned before soldering takes place. This allows errors to be detected and corrected at an early stage.nn3.
- After soldering: To identify soldering errors such as cold solder joints, short circuits, or missing solder joints. This helps to sort out defective products before they are further processed.nn4.
- During quality control: In the final stage of production to ensure that the finished circuit boards meet quality standards.
- During fault analysis: If there are repeated problems, AOI can help find the causes by systematically identifying faults.
In short: AOI is used to detect errors early on, ensure quality, and make production more efficient. It is an important step in modern electronics manufacturing.
How does an AOI inspection work?
An AOI inspection is carried out in several steps.
Once the assembled circuit board has been inserted into the AOI system, the following steps are performed:
- Image capture: The AOI system uses high-resolution cameras that automatically scan the assembly (PCBA). Several images are taken from different angles to ensure that all areas are captured clearly.
- Image processing: The captured images are transferred to image processing software. This software compares the images with a predefined target image that shows the correct arrangement and condition of the components.
- Error detection: The software searches for deviations, such as missing components, incorrect placement, incorrect component orientation, soldering errors, or short circuits. Special algorithms and pattern recognition are used for this purpose.
- Evaluation: If errors are detected, the system marks the affected areas on the image and creates an inspection report. This enables SMD revision staff to quickly identify and correct the errors.
- Decision: Based on the results of the AOI system, qualified personnel decide whether the assembly is OK or whether it needs to be rejected.
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