YesAX V3.1.2 - Software User Manual.pdf - 第94页
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SMEMA Conveyor Setup 9-5
3. A delay from the command issued to the pneumatic controls before the action
actually takes place. This may cause problems such as motor reversing before the
hard stop is down, which could cause board jam under the hard stop.
The Middle Sensor On Stable Limit and Middle Sensor On Time Out give user more control
over the middle sensor operations. They redefine the definition of On and Off. Normally the
software checks the sensor every 100 ms while the firmware checks the sensor continuously.
When Stable Limit is set to 0 as default, the middle sensor only has to report “On” once before it
is considered On by the software. If Stable Limit is set to 1, it will have to report On twice,
which means the middle sensor will remain on for 100 ms during that time. If Stable Limit is set
to 10, the middle sensor will need to see the board for one whole second (1000 ms, which is
highly unlikely in real situations) before it is considered as On by software. Therefore, the longer
in Y direction the board is, the bigger the Middle Sensor On Stable Limit will be. In case the
middle sensor misses the board, the left sensor will see the board and reverse the conveyor belt to
prevent boards from dropping.
General Inspection Methodology 10-1
10 - General Inspection Methodology
YesAX software controls three types of inspections:
Marking Inspection
Lead Bank Inspection
Solder Inspection
Each part can have any number and combination of these three types of inspections. A chip part
(e.g. 0805) may have one Marking and two Solder inspections. An SOIC14, on the other hand,
may have one Marking, two Lead Banks and 14 Solder inspections.
The light setting for AXI inspections is always Side Light. For X2 AXI systems there are two
camera views for inspections: Top (Optical) View and Top X-Ray View. Most 2D inspections
will be run under Top X-Ray View with Side Light on. For X3 AXI systems, other than Top
Optical View and Top X-ray View, there are eight more side angle views for X-Ray.
Inspections are conducted in two processing steps: Preprocessing and Decision. The
Preprocessing step prepares the image and the Decision step determines the Pass/Fail. The two
steps use various machine vision algorithms to accomplish the task.
10.1 Preprocessing
The preprocessing step is common for the 3 inspection types. Including NONE there are seven
preprocessing algorithms:
NONE - No preprocessing (default)
Red Filter - Pass the image through red color filter.
Green Filter - Pass the image through green color filter.
Blue Filter - Pass the image through blue color filter.
Binarize - Binarize the image into two gray levels, black and white.
Gain Offset -Adjust the image gray levels by set up gain and offset value.
Median Filter2 -Pass the image through median filter2.
The three color filters are for color inspection only and won’t be used for X-ray inspection. The
first 4 preprocessing algorithms and the last algorithm have no parameters.
The Binarize algorithm has one that is set with the Binarize Threshold dialog displayed below.