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III- 61 Programming Manual Part III Inspection Algorithm 1.16.3 Setting Procedur e Step1: Select SideLight from the Lighting drop-down list. NOTE Change the lighting to LowLight , if ﬂ ux is detected as bridge with SideL…

III-60

Programming Manual

Part III Inspection Algorithm

1.16 Distribution

1.16.1 Inspection Overview

Distribution is the algorithm to detect a solder bridge between leads of IC components.

Set the inspection window between leads of IC components. If a solder bridge exists between leads,

a bright line is laid across the inspection window because the solder is brighter than PCB.

The inspection window will be separated to several windows in longitudinal direction. The differences

between maximum minus minimum brightness level in each separated windows are calculated.

The sample value is the minimum value calculated among separated window (refer to Figure 1-76).

1.16.2 Parameter Setting

Figure 1-75 Distribution

Parameter Description

Lighting

Select SideLight. Change the lighting to LowLight, if ﬂ ux is detected as bridge with

SideLight.

Algorithm Select Distribution.

OverRange[Pixel] Enter 0.

Width[Pixel] Default is 2. Set the bigger value to reduce noise.

Option Enter 0.

Shift[V1-V8]

Enter the appropriate vector. Any value from V1 to V8 is available.

Select the vector according to the Memorize to ﬁ eld of the Adjust window.

Memorize to -

Upper, Lower Set upper and lower limit of the OK range.

Sample Refer to Figure 1-76.

Table 1-26 Parameter of Distribution

III-61

Programming Manual

Part III Inspection Algorithm

1.16.3 Setting Procedure

Step1: Select SideLight from the Lighting drop-down list.

NOTE

Change the lighting to LowLight, if ﬂ ux is detected as bridge with SideLight.

Step2: Change the inspection window size to surround the area from the lead base to the pad end.

Align its width to the lead pitch.

Step3: Enter values in the Upper ﬁ eld and the Lower ﬁ eld.

NOTE

Standard values are 80 (Upper) and 0 (Lower).

Step4: Enter the appropriate vector into the Shift ﬁ eld by selecting from V1 to V8 according to the

vector used in the Memorize to ﬁ eld in the Adjust window.

Step5: Right-click on Distribution in the inspection item list and select Parameter Copy to copy

parameter to the other leads.

Step6: Lead pitch is adjusted automatically by pressing Jump in the upper left side of the dialog.

Step7: Press Inspect. Make sure that the inspection is completed properly.

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(a) Normal (c) Bridge

(b) Bleeding

(It is not bridge)

Divide inspection window into several blocks.

Calculate maximum brightness level minus minimum brightness level in each column.

Minimum value is sample value.

(Sample Value is higher)

Figure 1-76 Bridge Inspection by Distribution

III-62

Programming Manual

Part III Inspection Algorithm

1.17 ImageMatchEx

1.17.1 Inspection Overview

ImageMatchEx is the algorithm to inspect for pattern matching inspection.

ImageMatchEx compares registered image and actual image inside the inspection window and

calculate matching rate.

ImageMatchEx can be recognized not only alphanumeric character but also symbol.

ImageMatchEx is suitable for missing or miss-mounting of any components inspection.

NOTE

ImageMatchEx can be used for Adjust. This algorithm corrects the amount of

misalignment of CAD data with the actual position on the components.

1.17.2 Parameter Setting

Figure 1-77 ImageMatchEx

Parameter Description

Lighting Select a lighting that displays characters visually clear.

Algorithm Select ImageMatchEx.

Search Range X,

Search Range Y

Set search range (=yellow dotted line). Enter the bigger value to enlarge the search

range. If the search range is not appropriate, the calculation time might be long.

Method[1/2/3]

Enter 1.

Shift[V1-V8]

Enter the appropriate vector. Any value from V1 to V8 is available.

Select the vector according to the Memorize to ﬁ eld of the Adjust window.

If using ImageMatchEx for misalignment adjustment, enter 0.

Resolution Enter 1.

Memorize to

Enter V4 in Memorize to to reﬂ ect this amount of misalignment to other

algorithm.

Upper, Lower

Set the upper and lower limit of the OK range.

Sample

Shows the match percentage.

The X and Y in the lower

right side of the dialog

Enter 99999.

If using ImageMatchEx for Adjust, enter the OK range in the X ﬁ eld and Y ﬁ eld.

Table 1-27 Parameter of ImageMatchEx