80S-20用户手册.pdf - 第233页
SIPLACE 80S -20/F4 User Manual 6 Vision functions Software version SR.407.xx 01/2001 US Edition 6.3 Component vision systems 233 6 Fig. 6.3 - 1 Regular component Key to Fig. 6.3 - 1 (1) Axi s of symmet ry 6 Criteria for …
6 Vision functions SIPLACE 80S-20/F4 User Manual
6.3 Component vision systems Software version SR.407.xx 01/2001 US Edition
232
The Pick&Place head picks up components from waffle pack trays, and positions them over the
optical centering system used. Offset rows of LEDs evenly illuminate the component with infrared
light. The digital image of the component generated by the camera is then transferred to the vision
analysis unit, where it is evaluated according to the component type. The results thus obtained
provide information on deviations in position, the rotational angle, lead condition, and the mapping
quality of the component. 6
New illumination methods and special algorithms for obtaining the component parameters have
been developed for BGAs and flip-chips. This means that this new generation of components
can now be optically centered.
The Pick&Place head returns any components that cannot be optically centered to the waffle
pack tray for further analysis.
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6
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6.3.3 Criteria for Recognition of Components
Shape of the components 6
Optical component centering allows both regular and irregular components to be centered. The
maximum number of leads, horizontally and vertically, is 99 in each case. 6
Criteria for regular components 6
Definition:
A component is deemed to be regular when it satisfies the following four conditions: 6
– rectangular package shapes (special case: square shape)
– only one lead type per side
– only one lead group per side
– opposite lead groups located symmetrically with respect to the two main axes
(X and Y axes).
SIPLACE 80S-20/F4 User Manual 6 Vision functions
Software version SR.407.xx 01/2001 US Edition 6.3 Component vision systems
233
6
Fig. 6.3 - 1 Regular component
Key to Fig. 6.3 - 1
(1) Axis of symmetry
6
Criteria for irregular components 6
Definition:
A component is deemed to be irregular when it does not satisfy the conditions for regular compo-
nents. 6
Additional conditions for centering with the component vision system: 6
– In any one row up to 3 different lead types are permitted.
– In any one row up to 15 groups are permitted.
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Y
X
Pin 1
1
1
6 Vision functions SIPLACE 80S-20/F4 User Manual
6.3 Component vision systems Software version SR.407.xx 01/2001 US Edition
234
6
Fig. 6.3 - 2 Example of irregular components
Pitch deviation 6
The pitch deviation (which is the distance from the center of one lead to the center of the next) can
be edited separately for each component in the GF editor. If this value is exceeded during the vi-
sion inspection, the component will not be centered and therefore not placed. 6
Limit values for quality measurement 6
Components exceeding the limit values for quality measurement will be rejected and, therefore,
not placed: 6
– Difference in the number of leads between the original and the model.
– Pitch deviation larger than the value in the GF file.
– Larger orthogonality error than specified in the GF file.
– Larger deviations of the external dimensions.
– Deviation of the central point greater than the permitted positional tolerance for pick-up.
X
Pin 1
Y
X
Pin 1
Type 1
Group 1
Type 2
Group 1
Type 1
Group 2
Type 3
Group 1
Type 2
Group 2