创建组件识别数据的方法.pdf - 第55页

55/178 IM-SMT-VSNDI C-0002 -000 [Recognition check items ] Items Y es / No Notes Body Size No Lead pitch Y es The pitch in the d irection wi th one lead is n ot check ed. Lead width Ma y exist Checks only when the lead w…

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Items to be set Set value
Explanation
Body Size Y (mm) Sets the size of the outer edge.
Body Size Z (mm) Sets the size of the outer edge.
Ruler Offset Sets the offset amount for the detection line.
Ruler Width
Lead Number N
Sets the number of leads in the cross direction.
Lead Number E
Sets the number of leads in the lengthwise
direction.
Reflect LL. (mm)
Sets the lead length on the image.
Lead Width (mm)
Sets the width of the lead.
Lead Pitch (mm)
Sets the pitch.
Table 35
In the normal mode, the recognition method is the same as QFP recognition.
Figure 46
QFPs and PLCCs are similar in terms of shape. However, unlike QFPs, the lead tips of
PLCCs may not be stably recognized (because the shape of the leads are not planar).
Also, in some cases, all of the illumination sources (Main light, Coaxal light and Side light)
need to be turned on in order to light up the leads stably. In this case, “Yes” should be
selected from the “All Lighting On” recognition parameter.
If the recognition is still not stable, Lead root recognition mode should be used.
In this mode, the root of the lead is recognized not the tip.
In order to improve the recognition rate, the positional relations between the leads are
checked and the combination best fits the component definition is extracted when the end
leads are detected
When this recognition mode is selected, either “Inside Recognition” or “Inside +
LeadAutoSearch” should be selected for ”Recognition Way” in the recognition parameters.
In the “LeadAutoSearch” mode, Lead detection is performed by using the lead pitch/ lead
width parameter and extracting the data best fits the definition data when detecting the lead
row.
Lead length
Lead width
Pitch
Body Size Y
Body Size X
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[Recognition check items]
Items Yes / No Notes
Body Size No
Lead pitch Yes
The pitch in the direction with one lead is not checked.
Lead width May exist
Checks only when the lead width is more than 1.0mm.
(Note 1)
Reflect LL No
Find Pos No
Table 36
Note:
“Lead width” check function may not be available for the old softwares.
The following is the actual example of the recognition of the normal lead tip detection and root
detection.
Items to be set Set value
Alignment Group IC
Alignment Type PLCC
Comp. Threshold 50
Comp. Tolerance 15
Search Area (mm) 6.0
Body Size X (mm) 17.53
Body Size Y (mm) 17.53
Body Size Z (mm) 4.30
Ruler Offset 5
Ruler Width 3
Lead Number N 11
Lead Number E 11
Reflect LL. (mm) 1.4
Lead Width (mm) 0.43
Lead Pitch (mm) 1.27
Table 37
When performing root recognition, it may not be able to be detected without inputting the
correct Lead length. Please check the display of the defined shape to make sure it matches to
the actual component.
<Lead tip detection> <Lead root detection>
Figure 47
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2.7.1 Special recognition in the PLCC Recognition mode
There are several special recognition algorithms available for PLCC recognition mode.
1) Special 1: Side Lead Fitting
This mode improves the recognition rate by checking the positional relations
between the leads and extracting the combination best fits the component
definition when detecting the end leads.
Option 1: Lead detection flag
As mentioned above, it is possible to perform Lead root detection by setting the option.
[ How to set the detection position when the Root detection mode is used ]
In the Root Detection mode, the root position of the lead is set as the reference lead position
(Find Pos). (See Figure 48.)
Figure 48
Bit position
Lead Search (0:Tip, 1:Root)
Find Pos X E1
Find Pos X N1
Find Pos Y E1
Find Pos Y N1
Find Pos X W1
Find Pos Y W1
Find Pos Y S1
Find Pos X S1