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SIPLACE 80S-20/F4/F4-6/F5 User’s Manual 5 Vision Functi on s Edition 03/98 from S oftware Version SR.404.xx 5.8 R ecommendation for visually centering components Line engi neer 5 - 153 5.8.2.4 Optimizing multiple measure…
5 Vision Functions SIPLACE 80S-20/F4/F4-6/F5 User’s Manual
5.8 Recommendation for visually centering components Edition 03/98 from Software Version SR.404.xx
5 - 152 Line engineer
5.8.2 Visually centering screening plates
PLEASE NOTE:
Screening plates must not be described as BGAs unless their dimensions exceed 32 mm x 32 mm. This is the
maximum admissible size for single measurements. If BGA mode is used to describe screening plates, the
holes are measured as well.
5.8.2.1 Entering the data on the line computer
Describe the radius of the holes.
Select tolerances of between 10% and 20 %.
5.8.2.2 Setting the parameters on the station computer
Under the ’Illumination’ option in the ’Test component’ menu, select the flat, medium and steep illumination
planes.
Select a negative ball contrast under the ’Ball image’ option in the ’Test components’ menu.
PLEASE NOTE:
If a lot of ’non-ball structures’ are identified as ball structures (they can be recognized by the small
crosses), reduce the negative value. The number of crosses can be estimated in the ’Measure’ menu dur-
ing the grid measurement.
5.8.2.3 Recommended sequence of measurements for screening plates > 32 mm x
32 mm
Grid measuring mode Ball measuring mode
Multiple measurement:
5 balls per corner
Hex values for small holes:
P1 = 80 (full resolution)
Standard ball detection:
Hex value P1 = 80
Fast ball detection:
Hex value P1 = A0
PLEASE NOTE:
Switch Ball mode off if it is not necessary to measure all
the balls.
In this case, P1 must be set to 80 in Grid mode.
Tab. 5.8.2 Recommended sequence of measurements for visually centering screening plates
SIPLACE 80S-20/F4/F4-6/F5 User’s Manual 5 Vision Functions
Edition 03/98 from Software Version SR.404.xx 5.8 Recommendation for visually centering components
Line engineer 5 - 153
5.8.2.4 Optimizing multiple measurements for screening plates
Screening plates that are larger than 32 mm x 32 mm are generally visually centered by multiple measure-
ment, although single measurement can still be used if you select a section of the component which is less
than 32 mm x 32 mm. To do this, select a characteristic, non-repeated ball pattern in order to avoid incorrect
placement.
Enter a value < 32 mm x 32 mm for the length and width of the component under the ’Case dimension’
option in the ’Test component’ menu.
5.8.3 General recommendations for centering flip-chips, BGAs and
screening plates
5.8.3.1 Setting the ball contrast parameters
If you select a high value for the ’Ball image’ option in the ’Test component’ menu, this will reduce the effect of
any defective structures. It does mean, however, that there is a possibility that not every ball will be detected.
Set a lower value to ensure that all the balls are detected. This will reduce the reject rate, but the measure-
ment will take longer.
5.8.3.2 Setting the ball radius parameters
Enter the ball radius on the line computer. This value is automatically reduced by 20 % since the vision sys-
tem will detect balls even if the specified dimensions are smaller then their actual physical dimensions.
So, set the ball radius on the station computer and then adjust the quality in the ’Measure’ menu.
– If no crosses are displayed on the ball, the radius is incorrect or the contrast is too high.
– If several crosses are displayed on a ball, then the radius has been entered incorrectly in the ’Measure’
menu.
PLEASE NOTE:
We recommend that you select a radius on the line computer that is slightly larger than the theoretical value
and then adjust it in the ’Ball image’ menu.
5.8.3.3 Setting the case shape dimension parameters on the station computer
For high-contrast flip-chips and BGAs, you can reduce the physical case shape dimension to the square sur-
rounding the balls (’Case dimension’ option). This will reduce the measuring time, although it can only be used
for single measurements. Size mode must also be active.
5 Vision Functions SIPLACE 80S-20/F4/F4-6/F5 User’s Manual
5.8 Recommendation for visually centering components Edition 03/98 from Software Version SR.404.xx
5 - 154 Line engineer
5.8.4 Visually centering flip-chips
5.8.4.1 Setting the parameters on the station computer
Under the ’Illumination’ option in the ’Test component’ menu, select:
– a value of around 50 for the medium illumination plane
– a value of around 20 for the steep illumination plane
5.8.4.2 Recommended sequence of measurements for visually centering bare dies
Measuring mode Size Grid Ball
Settings
Resolution in the measuring direction:
very high
——
Resolution in the integration direction:
very high
——
Tab. 5.8.3 Recommended sequence of measurements for visually centering bare dies