As one of the most fundamental components in electronic circuits, the size accuracy and identification information of resistors directly affect circuit performance and product reliability. Traditional manual inspection has pain points such as low efficiency, easy fatigue, and untraceable data, making automated visual inspection technology the key to breaking through.

In this issue, Xiao Ming shares a real case study - how Akusense Sensing uses a visual sensor to simultaneously measure the size of resistors and OCR recognition, doubling quality inspection efficiency and reducing costs!

I hope to complete size measurement and OCR recognition at the same workstation to reduce equipment space occupation and process flow time; Non contact detection is required to avoid material wear and tear

1. Identify whether the characters on the resistor are correct to avoid mixing materials

2. Measure resistance length

3. Measure the width of the resistance

4. More than 150 detections per minute

5. Accuracy error within 0.5mm

Visual Sensor VDS20 Series 

Red light source: adapted to the metal screen printing characteristics on the surface of resistors, enhancing contrast and suppressing environmental light interference.

6mm focal length lens: Balancing field of view and resolution to ensure precise measurement of small dimensions.

Mechanical focusing: Adapt to the fast focusing needs of resistors at different heights.

Software tools: OCR recognition, size measurement

Detection process: When the resistor reaches the detection station, the red light source lights up, and the sensor captures high-definition images; The algorithm automatically recognizes the resistance profile and calculates the length and width; At the same time, the OCR module recognizes silk screen information; The results are uploaded to the MES system in real-time, and defective products are automatically removed.

The detection speed can reach 150/minute, with an accuracy error of within 0.5mm