YesAX V3.1.2 - Software User Manual.pdf - 第149页
3D X-Ray Inspection Methodolo gy 11 -5 Add 3D Site button, when clicked, will capture 9 total images from different ang les at the current site, and then launch the Add 3D Site dialog window. Before clicking this button,…
11-4 3D X-Ray Inspection Methodology
2D X-ray image cannot determine barrel condition
3D Slice image showing solder not reaching the bottom surface of the circuit board.
11.2 User Interface for 3D Inspection
The 3D Control dialog (shown below) will always be on top of the screen. It can also be moved
around within the YesAX window and software will remember the position after each move, just
like the X-ray control window.
Side Angle View buttons allow the user to step through the 8 side angled views at 0, 45, 90, 135,
180, 225, 270 and 315 degrees. Center “+” image represents the regular 2D (top-down) view.
When navigating through sample board, it is advisable to use regular 2D view only.
Cycle Angle View button will cycle between all 8 angle views and the 2D view.
3D X-Ray Inspection Methodology 11-5
Add 3D Site button, when clicked, will capture 9 total images from different angles at the
current site, and then launch the Add 3D Site dialog window. Before clicking this button, please
make sure to use X-Ray camera, , by clicking on the X-Ray camera button and ensure that
you are in 2D mode by checking that the “Slice View” button is not depressed and that the “+”
button in the dialog is pressed. Two FOVs may be used for 3D mode, either 1” or 0.5”. Please
check that one of these FOVs is selected before adding a 3D site. Once an FOV is selected, an X-
ray power level must be selected. The power level setting affects the brightness of the image.
Select a power setting by choosing a brightness that is best suited for defect detection.
Edit 3D Site button when clicked will launch the Edit 3D Site dialog. The button will only be
clickable when there is a 3D site available and the site is right at current position.
Slice View button when clicked will toggle between 3D slice view mode and normal 2D view
mode. When the button’s been pressed down, system is in 3D slice view mode. Otherwise the
system is in 2D view mode. Each time after this button’s been pressed, status of the other buttons
in 3D control window will also be updated, whether be disabled or not. When in normal 2D view
mode, if there is at least one 3D site already defined in current FOV, click the Slice View button
will also move stage to the nearest 3D site position.
Next Site button when clicked will step through 3D sites one at a time. This button will allow
user navigate through different 3D sites easily.
Slice # field indicates the slice number, within current 3D site.
Next Slice button when clicked will step through slices within current 3D site, one at a time.
This button will allow user navigate through different slices with same site easily.
11.3 Add 3D Site
Before adding a 3D site, it is important to make sure to select X-Ray camera view and the
regular 2D view. It is also a good idea to pick the right FOV (either 1” or 0.5” FOV for X3) and
right X-ray power level setting for the device being inspected.
Once everything is ready, one click of the Add 3D Site button will prompt system to capture one
set of side angle images at current stage position automatically. After that the Add 3D Site dialog
will be launched. Slice at level 0 will be constructed and shown on screen. For 3D programming
the top side of the board is always set to at slice level 0 and should never be changed.
11-6 3D X-Ray Inspection Methodology
Current slice level is shown in top left corner. For Add 3D Site dialog, 0 (as representing the top
side of the board) will always be shown at first time.
The slider bar on left allows user to adjust current slice level and update the slice view on
screen. Click the up and down arrow will change slice level one at a time and click on the empty
space between slider bar and arrow button will change slice level at the step of 10. The user can
also hold the slider button and change slice level to any number between -300 and 300.
Top and Bottom buttons indicate the slices correspond to board top surface and bottom surface.
Board top surface will always have a slice number of 0. Depends on the board thickness and the
current FOV, default bottom slice level will be calculated automatically. The distance (in Z axis)
between each slice depends on the FOV. For 1” FOV, the distance is 1 mil (0.001 inch or 25.4
um). For 0.5” FOV, the distance is 0.5 mil (0.0005 inch or 12.7 um). So if current site is in 1”
FOV and the board thickness is 60mil, the default slice level for bottom side board will be -60.
Sometimes the measurement of the board is not perfect and the slice level for bottom side of
board may not be at the exact number as calculated. It is recommended to fine tune the bottom
side slice level. Once the best number has been found the same number should be used for
different site, for consistency purpose.
Surface Offset defines the offset number for current 3D site. Ideally the slice at 0 should give
the best result for top slice of the board. But for multiple reasons slice number 0 does not
necessarily represent the best slice. These reasons include board warp, board clamping,
component location and others. Since slice level 0 is used for top slice at any time, an offset
number needs to be introduced and offset the actual height change. To adjust the surface offset
number, user always need to put slice level at 0 first and then adjust the surface offset number to
get the best slice for top side of the board.
List of Slices shows a list of slices have been added to current site. This list can hold up to 10
different numbers for each 3D site. Normally 2 slices is required for board inspection, one
represents top side and the other one represents bottom side.
Add Slice button will allow user to add the current slice level to slice list with one click. Please
note that information of current 3D site won’t be added to recipe if no slice’s been added to slice
list before the Add Slice dialog’s been closed. For people only want to take a look at slices at
different level and don’t want to add current 3D site to list, use Add Slice dialog without adding
an actual slice will be a good idea.