SOM-1735-001.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 0307-001 …

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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.

"Enable (Placement)" is selected.

• The average gray value in the inspection range of the polarity

mark must be 20 shades of gray or more, compared with the other

inspection ranges.

(The gray value in the inspection range can be checked through

the component recognition test.)

5.2 Parameters (B02-14)

Fig.75

Polarity detn

Disable

Note

• 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

0307-001 33 Tg0930-PM-SO

5.2 Parameters (B02-14)

Fig.78

Inspection method 4-Point Insp

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(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