TECHSPEC® Cr SERIES LENSES
Compact Ruggedized (Cr) for Shock and Vibration
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perform this task, the unit is removed by the
operator and a plastic cap placed onto the top.
After placement, the operator then re-inserts
the assembly into the inspection system. Data
Matrix code on the side of the part is then again
inspected to ensure that the part checked for
proper component and placement is the same.
To perform the task of cap inspection, the
unit is illuminated from above and template
matching software again used to verify both its
shape and orientation. After this process is com-
plete, the validated part and image data is trans-
ferred and logged to the automotive company’s
factory automation system, allowing image
archiving against Data Matrix serial num-
bers so that the manufacturer can track any
later warranty claims. Validated parts are then
shipped to the customer for fnal assembly.
As well as ensuring proper component placement, the system must also determine whether the PCB is positioned correctly in the aluminium housing. This positioning is achieved
using three protruding plastic pins located at
both the sides and bottom of the PCB. Since
the pins are used to secure the PCB in the
housing, their presence must be ensured
before a plastic cap is placed onto the unit.
To accomplish this task, a 3D profling system
could have been used to perform this task.
However, since such systems are relatively
expensive, a rather elegant less-costly solution
was employed. Realizing that the protruding
pins would cast a shadow when illuminated
from an angle, the system employs a 150mm
long white bar light from Spectrum Illumination mounted at a 90o angle to the PCB. Thus,
by illuminating the board from the top and
sides simultaneously, the shadows cast by the
protruding pins can be used to determine pin
presence and height, and to confrm they have
not been damaged.
After performing Data Matrix reading along
with proper component placing and fxturing,
the automotive assembly must be capped. To
Industrial Vision Systems
Didcot, Oxfordshire, England
Montague, MI, USA
Shadows cast by the
protruding pins can be
used to determine pin