Machine Vision

View 725 PLCC Inspector

Using 4 cameras with custom aspheric optics for the side view. The aspheric view gave 5x magnification in the axis of the critical dimension. Using a custom target to define a 3D plane in space to coordinate the four side cameras each lead is measured from that plane. The three tallest pins are then used to determines the mounting plane of PLCC chip without contacting the pins. The coordinates of the remaining pins are then measured to determine the space between each pin and the mounting plane. The pin furthest from the mounting plane is then used to determine the pass/fail criteria. A fifth camera from the top is used to measure the package dimensions for additional quality criteria.