YesAX V3.1.2 - Software User Manual.pdf - 第130页
10 - 36 General Inspecti on Methodolo gy 10.5.2.1 Edit Lead Bank Parameters On this dialog the user sets the pitch of the BGA balls, the number of balls in the BGA lead bank , the direction , the view , the lighting and …
General Inspection Methodology 10-35
10.5.2 Lead Bank Inspection
BGA Lead Bank inspection checks for bridges between BGA balls, missing balls, and ball off-
position cases. The default algorithm for BGA lead bank inspection is BGA Group. Currently
there are two algorithms for BGA lead inspection, BGA Group and Image Subtraction.
After a lead bank inspection box is created, you can display the Lead Bank pop-up menu by
clicking the right mouse button while pointing at the inspection box.
Edit Lead Params..
Launches the Lead Parameters dialog. See 10.3.1 Edit Lead
Bank Parameters.
BGA Group Parameters
Launches the Lead Blob Analysis Parameter dialog. See
10.3.2 Lead Blob Analysis Parameter.
Align..
Launches the Lead Bank Alignment dialog to allow
alignment of lead bank inspection box. See 10.3.3 Lead
Bank Alignment.
Train Solder
Trains the solder inspection within the lead bank.
Move/Resize
Moves or resizes the lead bank inspection box.
Break into Sectors
Breaks up a long lead bank into smaller sectors. See 10.3.4
Break Lead Bank into Sectors.
Delete
Deletes the inspection box.
Update
Uses the current lead bank as reference to update the
parameters of other lead banks.
Test
Tests the lead bank inspection on the current image.
10-36 General Inspection Methodology
10.5.2.1 Edit Lead Bank Parameters
On this dialog the user sets the pitch of the BGA balls, the number of balls in the BGA lead bank,
the direction, the view, the lighting and the algorithm selection.
BGA lead banks will always have more than one Row Count, which is different from normal IC
components.
The Camera View for X-Ray images is always set to X-ray.
The Slice View should always be checked for 3D inspection and unchecked for 2D inspection.
The Slice No. must be specified for 3D inspection.
The Lighting for X-Ray images is always set to Side.
The X-Ray Power Level lists the power level number for the current lead bank.
The Preprocess for BGA lead bank is always set to NONE and the Decision is always set to
BGA Group.
General Inspection Methodology 10-37
It is somewhat tricky if you want to change the FOV of an X-ray inspection (e.g. from 1” FOV to
0.5” FOV). Here are the steps to do so: First use the Move Z dialog to move the Z stage to the
desire FOV, point the mouse to the Region of Interest (ROI), and open the Edit Lead Bank
Parameters dialog. Press the X-ray button (the button is already depressed) in the Camera View
group again, and then press OK to close the dialog. Double click near the video cross hair to
refresh the screen display; you will see the ROI box change from blue to green indicating the
FOV has changed.
BGA Group Analysis Params launches the BGA Group Parameters dialog.
Pitch is the distance between each BGA balls, either in row or column. It can be in mils or
microns. (Typical values, 1500 um, 1270 um, 1000 um)
Min Area Percent sets up the threshold for detecting a BGA ball missing case. A BGA ball with
its area less than the minimum area will be caught as a missing ball. A value of 25% is typical
for this parameter. It can range from 5 to 40%.
Off Position Percent combined with pitch, defines the maximum distance (in the percentage of
pitch) that one BGA ball could be off from its original position. Set this parameter to detect off-
position solder balls. A value of 20% is typical for this parameter. It can range from 0 to 40%.
Binary (BGA ball) Threshold sets the binary threshold value which is used to convert gray
scale images into binary images. A good binary threshold value separates the majority of BGA
balls from their background and results in good measurement values. The Suggest Binary
Threshold Value is the pre-calculated value based on the current image. When the dialog is first
launched, the binary threshold value will be set equal to the suggested binary threshold value.
Later on you can select a different binary threshold value by moving the slider bar.