80S-20用户手册 - 第363页
SIPLACE 80S -20/F4 User Manual 6 Vision functions Software version SR.407.xx 01/2001 US Edition 6.8 Recommenda tion for visually centering components 363 6.8.4.3 Recommended sequence of measurement s for > 32 mm x 32 …
6 Vision functions SIPLACE 80S-20/F4 User Manual
6.8 Recommendation for visually centering components Software version SR.407.xx 01/2001 US Edition
362
6.8.3.2 Recommended sequence of measurements for optically centering bare dies
6.8.4 Centering shielding plates using the vision system
PLEASE NOTE:
Do not describe shielding plates as BGAs unless they are larger than 32 mm x 32 mm in size. This
is the maximum permissible size for single measurements. If BGA mode is used to describe
shielding plates, the holes will be measured as well. 6
6.8.4.1 Data input on the line computer
Å Describe the radius of the holes.
Å Select a value between 10% and 20 % for the tolerance.
6.8.4.2 Setting parameters on the station computer
Å Select the ‘Illumination’ option from the ‘Test component’ menu, and then select the flat, aver-
age and steep illumination levels.
Å Select the ‘Ball illustration’ option from the ‘Test component’ menu, and then select a negative
ball contrast.
PLEASE NOTE:
Reduce the negative value if you find that a lot of ‘non-ball structures’ are recognized as ball struc-
tures (which can be identified by the tiny cross marks). The number of crosses can be estimated
during the grid measurements by selecting the ‘Measure’ menu. 6
Measuring mode Size Grid Ball
Settings
Resolution in measuring direction:
very high
——
Resolution in integration direction:
very high
——
Tab. 6.8.2 Recommended sequence of measurements for optically centering bare dies
SIPLACE 80S-20/F4 User Manual 6 Vision functions
Software version SR.407.xx 01/2001 US Edition 6.8 Recommendation for visually centering components
363
6.8.4.3 Recommended sequence of measurements for > 32 mm x 32 mm
shielding plates
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6.8.4.4 Optimizing the multiple measurement for shielding plates
Shielding plates that are larger than 32 mm x 32 mm in size are generally optically centered by
multiple measurement. The single measurement can be used, however, if you select a component
section that is smaller than 32 mm x 32 mm. If you do this, select a characteristic, non-repeating
ball sample in order to avoid placement errors. 6
Å Select the ‘Package dimension’ option from the ‘Test component’ menu, and then enter <
32 mm x 32 mm for the length and width of the component.
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Grid measuring mode Ball measuring mode
Multiple measurement:
5 balls per corner
Hex values for smaller holes:
P1 = 80 (full resolution)
Robust ball recognition:
Hex value P1 = 80
Fast ball recognition:
Hex value P1 = A0
PLEASE NOTE:
Switch Ball mode off if it is not necessary to mea-
sure all the balls.
P1 must then be set to 80 in Grid mode.
Tab. 6.8 - 3 Recommended sequence of measurements for > 32 mm x 32 mm shielding plates
6 Vision functions SIPLACE 80S-20/F4 User Manual
6.8 Recommendation for visually centering components Software version SR.407.xx 01/2001 US Edition
364