Custom Application - Lead Frame Inspection


Custom Application - Lead Frame Inspection

This is an illustration of a custom application for lead frame inspection where MNEMONICS integrated a custom software development into a lead frame feeder apparatus. The MNEMONICS software controls the material advance mechanism, so that lead frames are properly positioned for a two-camera inspection - a plan view (as shown) and an axial view (not shown). The lead frame is inspected by the front and back half of the lead frame. (In this case there are 10 leads, and five leads are inspected in any particular field of view.)

In the view shown (plan view), measurements are made to determine the lead body width, lead body angle, head width, and lead pitch. The various graphic overlays show the various edge detection processes, line fitting, and centroid calculation processes. From these raw image analysis results, derived measurements such as lead pitch and head-to-body offset can be calculated. The axial view (not shown) also measures lead displacement and pin gap opening.

The MNEMONICS software also interfaces with the PLC (programmable logic controller) on the lead frame advance mechanism. MNEMONICS also provided all camera and custom illumination design and implementation, designed the camera and illumination fixtures, and provided and integrated the PC, image digitizer, and I/O control hardware. MNEMONICS' ALIGN software was used as a building block for part of the system implementation.

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