PCB chip pin detection based on line structure light
Chong‐song Zhou, Bo Tao · AOPC 2021: Optical Sensing and Imaging Technology · 2021
Printed Circuit Boards (PCB) are widely used, in which the PCB chips are the control core of the whole PCB Board and the pins of the chip are very important in the soldering process. Aiming at this demand, a laser triangulation detection platform based on line structured light is designed. The system emits a laser beam through the semi-conductor laser, which is diffusely reflected by the pin of the target object and its solder, and is then imaged on CMOS to form a point cloud pattern through weighted total least square method. Then, the height of each pin, the distance between each pin and the height change of PCB plane are calculated by the depth map. Fit the straight line of the lead edge by the least square method, measure the distance from the straight line to the straight line to get the distance between the leads, and use the change of the distance to judge whether the lead is misaligned.