创建组件识别数据的方法.pdf - 第14页
14/178 IM-SMT-VSNDI C-0002 -000 1.3 . Simple settings for component dat a As the left/right and upper/ lo wer leads of the QFP compone nts are symm etrical, the components can be ex press ed in one group. Also, the outer…
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<Group 2: right-side group in N direction>
Reference lead position X N2 : 3.00mm
Reference lead position Y N2 : 6.00mm
ReflectLL N2 : 1.00mm
Lead width N2 : 0.60mm
Lead pitch N2 : 1.27mm
Lead number N2 : 3
Defining the Lead Groups in this way makes it possible to define the components that have
different lead width, lead pitches and lead length.
For the E direction, in the same way, pe1 is defined as the reference for the first Lead Group
and pe4 is defined as the reference for the second Lead Group.
< 1
st
Lead Group >
Reference lead position X E1 : 7.50mm
Reference lead position Y E1 : 3.81mm
ReflectLL E1 : 1.00mm
Lead width E1 : 0.40mm
Lead pitch E1 : 1.27mm
Lead Number E1 : 3
<2nd Lead Group >
Reference lead position X E2 : 7.50mm
Reference lead position Y E2 : -1.27mm
ReflectLL E2 : 1.00mm
Lead width E2 : 0.60mm
Lead pitch E2 : 1.27mm
Lead Number E2 : 3
It is possible to define the leads by a single Lead Group in the S and W direction.
<S direction Lead Group >
Reference lead position X S1 : - 5.08mm
Reference lead position Y S1 : - 6.00mm
ReflectLL S1 : 1.00mm
Lead width S1 : 0.40mm
Lead pitch S1 : 1.27mm
Lead Number S1 : 9
<W direction Lead Group >
Reference lead position X W2 : - 7.50mm
Reference lead position Y W2 : 3.81mm
ReflectLL W2 : 1.00mm
Lead width W2 : 0.40mm
Lead pitch W2 : 1.27mm
Lead Number W2 : 7
Basically, the component data can be created in this way. However, there is a method to
create the data more simply by inputting only the minimum data on the machine.
The following section describes the process.
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1.3 . Simple settings for component data
As the left/right and upper/lower leads of the QFP components are symmetrical, the
components can be expressed in one group. Also, the outer shape is determined based on
the lead tips. Therefore, the center of the QFP component is equal to the center of the outer
shape.
The lead length, the lead pitch, the lead width are the same in each direction and only the
number of the leads in N/S and E/W direction may be different.
For these reasons, it is possible to define the component shape as long as the following
information is available.
- Body size X (xsize)
- Body size Y (ysize)
- Body size Z (zsize)
- Lead Number N (hnum)
- Lead Number E (vnum)
- Lead pitch (pitch)
- LeadWidth (width)
- ReflectLL. (length)
Figure 8
The following is the explanation of the above mentioned simple setting for QFP component.
In the QFP mode, the component data (shape parameters) is created automatically in the
machine by just setting the data indicated in Table 3.
Items to be set Set Value
Body Size X (mm) Xsize
Body Size Y (mm) ysize
Lead Number N hnum
Lead Number E vnum
Lead pitch (mm) pitch
Lead width (mm) width
Reflecting lead length (mm) length
Table 3
Number of the leads N
Body Size X
Number of the leads E
Reflect lead length
Body Size Y
Center of the component
Lead Pitch
Lead Width
S direction
N direction
E direction
W direction
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<Automatic settings>
The setting is calculated as follows (See
Figure 9
):
hposx = (hnum - 1) * pitch / 2
hposy = ysize / 2
vposx = xsize / 2
vposy = (vnum - 1) * pitch / 2
Figure 9
<< The result of the automatic setting for GFP recognition >>
Items to be set Set value
Alignment Group IC
Alignment Type QFP
Comp. Threshold -
Comp. Tolerance -
Search Area (mm) -
Body Size X (mm) xsize
Body Size Y (mm) ysize
Body Size Z (mm) zsize
Cntr. Offset X (mm) 0
Cntr. Offset Y (mm) 0
Cntr. Offset R (mm) 0
Ruler Width 3
Algorithm 0
Base Alignment 0
Vision Option 0
Vision Option 2 0
Body Size X (xsize)
Body Size Y (ysize)
Center of the component
S
E
W
N