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Pr oduc t Ch ang e Ov er User Re f eren ce Manu al 4022 591 960 82 6-80 FCM M ult ifle x 02.02 6. Cal culate th e centr e an d angl e o f th e componen t with th e information of th e lead side s and lead ends. 7. Ch eck…

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4022 591 96082 User Reference Manual
02.02 FCM Multiflex 6-79
Product Change Over
▼ For which components do you use this algorithm
For components that have a good reflection image (lead ends, or body), like:
• 0402, 0603, etc.;
• Yellow tantals;
• MELFs with good reflection.
▼
General important information
• This algorithm is more critical than the RECTANGLE algorithm. This means it
needs a better/sharper vision image of the component.
• Ruler offsets are adjustable in the SMD info file; normally the value 3 is used
for most components (5 or 7 is also possible if you have components with a
bigger lead width). Ruler offset is in pixels; one pixel = 75x 75 µm. Always
use odd ruler widths in order to get valid mean calculation results.
The SOT algorithm
▼ How does it work
1. Find the first and last lead of the South side (for a SOT, normally more than one
lead).
2. Find the first and last lead for the other side.
3. Measure all lead sides (edges) for both component sides (North/South).
4. Measure all lead ends for both component sides (North/South).
5. Chech the pitch between the leads (if there is more then one lead a side).
FIGURE 6-29 The SOT algorithm measuring aspects
Ruler
Ruler
Ruler offset
Ruler offset
Lead edge
Lead end
Search area Fine-search area
Fine-search area
SOUTH
NORTH
Product Change Over
User Reference Manual 4022 591 96082
6-80 FCM Multiflex 02.02
6. Calculate the centre and angle of the component with the information of the
lead sides and lead ends.
7. Check the distance between the middle of the first side (North) to the middle of
the second side (South).
8. Calculate the component origin, based on the found vision origin and gravity
offsets.
FIGURE 6-30 Calculation of the component origin
▼
For which components do you use this algorithm
For components that have leads on two sides (North and South), having only one
lead at one side, like:
• Transistors SOT23, SOT323, etc.;
• DPAKs.
▼
General important information
• Ruler offsets are adjustable in the SMD info file; normally the value 3 is used
for most components (5 or 7 is also possible if you have components with a
bigger lead width). Ruler offset is in pixels; one pixel = 75x 75 µm. Always
use odd ruler widths in order to get valid mean calculation results.
• The body length and width in the SMD info file must be correct, because they
determine the positions of the leads together with the number of leads and
the lead pitch.
• For the ruler threshold, the value is normally between 20 and 30, but it
depends on the specific component type and the amount of light used.
Component origin = vision origin
NORTH
SOUTH
Body length
Body width
4022 591 96082 User Reference Manual
02.02 FCM Multiflex 6-81
Product Change Over
• The search area as indicated in the drawings matches the reject level in the
SMD info file.
The SO algorithm
▼ How does it work
1. On the South side, find the first lead (black one in drawing) with a defined
search area and the last lead with a fine-search area.
2. Find the first lead (black one in drawing) and the last lead for the other side.
3. Measure all lead sides (edges) for both component sides (North/South).
4. Measure all lead ends for both component sides (North/South).
5. Check the pitch between the leads (if there is more than one lead a side).
6. Calculate the centre and angle of the component origin with the information of
the lead sides and lead ends.
FIGURE 6-31 The SO algorithm measuring aspects
7. Check the distance between the middle of the first side (North) to the middle of
the second side (South).
8. Calculate the component origin based on the found vision origin and gravity
offsets.
Ruler
Ruler
Ruler offset
Ruler offset
Search area
Fine-search area Fine-search area
Fine-search area
NORTH
SOUTH