SOM-1627-002.pdf - 第34页
• In the case of “BGA”, the center of the ball grids must be aligned with the center of the mold. Fig. 76 Sequence of Polarity Determination T op View of Component (Polarity Different by 180°) Fig. 77 0102-001 3 2 AGQ01E…
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(B02-14) Polarity detn
Specify how to determine the polarity (direction) of the component.
Fig. 74 Edit Window (Example)
(1) Polarity detn
Set a parameter to specify whether or not the polarity determination
should be made.
Disable : Select this when the polarity determination
should not be made.
Enable (Discard) : When the polarity is checked and determined
as a different one, a recognition error occurs.
Enable (Placement) : After the polarity is checked and determined,
the component is placed according to the de-
termined polarity.
(a) When "Enable (Placement)" is selected, the recognition processing
time becomes twice or more as long as the normal one.
(b) When it is required to check whether or not a component has a po-
larity (when components are not fed in the specified direction), "En-
able (Discard)" or "Enable (Placement)" must be set in the text box.
The machine performs the recognition operation after checking the
polarity.
(c) The following requirements must be met when "Enable (Discard)"
or "Enable (Placement)" is selected.
• There should be a clear difference in the average gray values be-
tween the inspection range of the polarity mark and the others.
5.2 Parameters (B02-14)
Fig.75
Polarity detn
Disable
• In the case of “BGA”, the center of the ball grids must be aligned
with the center of the mold.
Fig. 76
Sequence of Polarity Determination
Top View of Component
(Polarity Different by 180°)
Fig. 77
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5.2 Parameters (B02-14)
(2) Inspection method
Specify how many places should be inspected for polarity determina-
tion.
Select "4-Point Insp" or "2-Point Insp" as an inspection method.
4-Point Insp: Select this to inspect the four places rotated in incre-
ments of 90°, based on the center of the component.
Select this for a square component.
Fig. 79
2-Point Insp: Select this to inspect the two places rotated by 180°,
based on the center of the component.
Select this for a rectangular component.
Fig. 80
Regarding the missing ball as a polarity
Top View of Component
Fig. 81
5.2 Parameters (B02-14)
Fig.78
Inspection method 4-Point Insp
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