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6 Vision functions User Manual HS-50 6.6 Test Component Software-Version 5.01 Edition 01/99 282 The followi ng combi nations o f meas urement m ethods ar e used: – Size -driven — cor ner-driv en — l ead-drive n (s ee t…
User Manual HS-50 6 Vision functions
Software-Version 5.01Edition 01/99 6.6 Test Component
281
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As far as conventional components with lead connections are concerned, component centering is
essentially based on four measurement methods used to determine the position (x and y coordi-
nates,
Φ
= skew) of the component and the lead parameters:
– Size-driven mode
– Row-driven mode
– Corner-driven mode
– Lead-driven mode
For BGAs (B
all Grid Arrays) and flip-chips new algorithms have been implemented in order to de-
termine the position (x and y coordinates,
Φ
= skew) of the component and the ball parameters
(see Section 6.6.4.4 on page 6 - 257 ):
– Grid-driven mode
– Ball-driven mode
In accordance with your specifications any measurement method can be omitted from this se-
quence. However, it is not possible to change the way this sequence runs.
Definition of the measuring methods
– 6L]HGULYHQ
This measurement method has been especially developed for small components. On the basis
of the information on dimension parameters the position and rotation of small components is
determined rapidly and reliably.
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The size-driven mode also employs profiling. You can have the profile formed along either the
width RU the length of the component. You should make your choice within the options field.
The default selection is for profiling along the longer side.
– 5RZGU LYH Q
This measurement method is based on information from one row of leads.
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The measurement results provide precise information on the coordinates and rotation of the
component, the number of leads, the pitch and the row offset.
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This method is used to obtain information from an inspection of every single lead.
6 Vision functions User Manual HS-50
6.6 Test Component Software-Version 5.01 Edition 01/99
282
The following combinations of measurement methods are used:
– Size-driven — corner-driven — lead-driven (see table in Section 6.6.4.15) or
– Row-driven — corner-driven — lead-driven (see table in Section 6.6.4.15)
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The measurement results will provide information on the approximate coordinates and approx-
imate rotation of the component. In addition, you will be informed of the quality of measure-
ment.
– The measurement results will provide precise information on the approximate coordinates and
approximate rotation of the component. In addition, you will be informed of the maximum ball
offset and the quality of measurement.
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The following table contains our recommendations for the optimum sequence of measurement
methods for particular components. The following abbreviations are used:
B = ball-driven C = corner-driven G = grid-driven
L = lead-driven R = row-driven S = size-driven
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6 5 * & / %
MELF S L
CHIP S L
SOT S C L
SL
SOJC6 S C
SOJC14 R C
LCC R C L
PLCC R C L
QFP R C L
TAB R C
L
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BGA, flip-chip S G B
User Manual HS-50 6 Vision functions
Software-Version 5.01Edition 01/99 6.6 Test Component
283
*)
L applies to irregularly shaped components with separate windows
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Click on the ‘Setting’ field for the ‘Size’ measuring mode to overlay the 6L]HPHDVXULQJPRGH
menu on the screen.
This menu is used to
– vary the resolution the angle calculation.
– specify the method for the rotation calculation and
Bare dies S
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Tab. 6.6.1