Dek-265GSX-User-Manual.pdf.pdf - 第272页
Auto Learn 2Di inspection can automatically learn different types of features as shown below. 8.8 User Manual Software Version 6 2Di INSPECTION MODULE OVERVIEW Column of Sites QFP BGA Single Site Row of Sites Site 1 2 3 …
Paste Volume
Prediction
2Di uses blockage and paste on pad inspection results for a site to predict the
volume of paste on a pad, thisis only availablewhile the level of inspection is set
toadvanced for both the board and screen. An example of how thisis achieved is
given below.
Software Version 6 User Manual 8.7
2Di INSPECTION
MODULE OVERVIEW
In the example shown the aperture is 100% clear. The paste on pad value was 100%.
This can be represented by the following model of the printed paste :
This is represented by the following model of the printed paste :
Top face equals area of
aperture not blocked by
paste, ie 100%.
Top face equals area of
aperture not blocked by
paste, ie 60%.
Bottom face equals area of
paste on pad, ie 100%.
Bottom face equals area of
paste on pad, ie 90%.
Using a complex formula 2Di predicts the volume of paste, in this case 74.48%.
Aperture
From this information the system predicts the volume of paste, in this case 100%.
In the following example the aperture has a blockage of 40%. Therefore the aperture is 60%
clear. The 60% is equal to a rectangle of the same size as shown below. The paste on pad
inspection result is 90%.
Screen
Pa d
Pa s t e o n Pa d
Board
Aperture
Paste (Blockage) 40%
Screen
Aperture
Paste (Blockage) 40%
Screen
=
Figure 8-6 Paste Volume Prediction
Auto Learn 2Di inspection can automatically learn different types of features as shown
below.
8.8 User Manual Software Version 6
2Di INSPECTION
MODULE OVERVIEW
Column of Sites
QFP
BGA
Single Site
Row of Sites
Site 1
2
3
Site 1
2
3
Site 1
2
3
4
5
6
7
8
9
10
11
12
Site 1
2
3
4
5
9
12
13
16
15
14
8
NOTE
When auto learning a component,
setup Site 1.
The component is learnt in the
sequences shown above.
BGA Frame
Site 1
2
3
4
16
6
14
7
8
13
5
12
15
11
10
9
Figure 8-7 Auto Learn Site Types
Inspection Cycles During setup, sites are given a priority of either Every Cycle (EC) or General
(G). The amount of sites inspected during each cycle is set using the min
sites/cycle parameter, this must be set to at least the amount of every cycle sites.
As the name suggests, EC sites are inspected every cycle. General sites are
inspected depending on the value of the min sites/cycle parameter and the
number of EC sites as follows:
Number of general sites inspected per cycle = Min sites/cycle parameter - EC
sites.
The general sites are inspected in rotation as shown below.
Software Version 6 User Manual 8.9
2Di INSPECTION
MODULE OVERVIEW
Site 1
Cycle 1
Cycle 2
Cycle 3
Cycle 4
Cycle 5
In the above example, 7 sites have been setup, with 2 given the priority of Every Cycle (EC)
and 5 given the priority of General (G). The min sites/cycle parameter is set at 5.
As there are 2 EC sites, this leaves 3 G sites to be inspected at each cycle as follows:
Cycle 1 - Sites 3, 4 and 5.
Cycle 2 - Sites 6, 7 and 3.
Cycle 3 - Sites 4, 5 and 6.
Cycle 4 - Sites 7, 3 and 4.
Cycle 5 - Sites 5, 6 and 7.
Cycle 6 - Process repeats.
Site 2 Site 3 Site 4 Site 5 Site 6 Site 7
EC
EC
EC
EC
EC EC
EC
EC
EC
EC
EC
EC
G
G
G GG
G
G
GG
G G G
G
G G
G
G G G G
Figure 8-8 Site Inspection Cycles