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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