创建组件识别数据的方法.pdf - 第50页
50/178 IM-SMT-VSNDI C-0002 -000 Figure 44 2.6.1. Special recogn ition in the QFP Recogn ition mode There are som e special alg orithms available f or QFP recogn ition mode. 1) S pecia l 1: Side Lead F itting This m ode i…
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This mode is used for recognition of standard QFPs.
Figure 43
[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 32
Note:
1. This function may not be available for some old softwares.
<Items to be set for QFPs>
Items to be set Set value
Alignment Group IC
Alignment Type QFP
Comp. Threshold 50
Comp. Tolerance 30
Search Area (mm) 6.0
Body Size X (mm) 16.0
Body Size Y (mm) 16.0
Body Size Z (mm) 1.5
Ruler Offset 2
Ruler Width 3
Lead Number N 25
Lead Number E 25
Lead Pitch (mm) 0.5
Lead Width (mm) 0.18
Reflect LL. (mm) 0.5
Bumper Mask (mm) 0
Table 33
Body Size Y
Body Size X
Pitch
Lead width
Lead length
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Figure 44
2.6.1. Special recognition in the QFP Recognition mode
There are some special algorithms available for QFP 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 3: Recognition Flag
2) Special 2: NS Base Search
In this mode, SOJ recognition is performed by first using the leads in the N/S
direction, then based on the data, the recognition of W/E direction is
performed.
Option 3: Recognition Flag (same as Special 1)
3) Special 3: WE Base Search
In this mode, SOJ recognition is performed by first using the leads in the W/E
direction, then based on the data, the recognition of N/S direction is
performed.
4) Special 4: Check Lead Length
In this mode, a function that checks the lead length is added to the normal
QFP recognition.
It checks whether the distance between the straight line running across the
Bit position
Excessive Lead Check (0:Non, 1:Exist)
(It checks whether the extra leads exist outside of the pitch 1.)
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lead tips and tips of each lead is less than the specified distance.
Option 1: Bumper mask offset X:(The offset in the X direction: Pixel)
Option 2: Bumper mask offset Y: (The offset in the Y direction: Pixel)
Option 3: Allowable length error (set as a value in units of 1/100 mm).
Values that may be set are those between 0 and 255 (0.01 ~ 2.55 mm).
It does not perform a check when the value is 0.
(When setting the value larger than 128, please input the value that subtract
256 from the set value.)
Figure 45
Note:
Please refer to “Appendix 3. Creating simple data in the special recognition modes” for the
method how to create components data in Special mode
<< Items to be set for QFP Special recognition >>
Items to be set Set value
Explanation
Alignment Group
Special
Sets the component category.
Alignment Type
Special
Sets the component type.
Comp. Threshold
Sets the detection level difference for
lead detection.
(See “Appendix 2.
Detection level differences used to detect
leads (threshold value)”.)
Comp. Tolerance
Specifies the tolerance of the lead pitch
as a percentage.
Search Area (mm) Sets the range of the detection.
Body Size X (mm) Sets the size of the outer edge.
Body Size Y (mm) Sets the size of the outer edge.
Body Size Z (mm) Sets the size of the outer edge.
Cntr. Offset X (mm)
Sets the offset amount in the X direction
from the center position.
Common
Data
Cntr. Offset Y (mm)
Sets the offset amount in the Y direction
from the center position.
Line running across the tips.
Checks the distance between the line running
across the tips of the leads and the lead tip.