80S-2080F480F5 - 第382页

5 Vision Functions SIP LACE 80S-20/F4/F5 Us er Manual 5.7 Guidelines for Describi ng Package Forms 05/99 Issue from Software Version SR.405.xx 5 - 150 Line en gineer NOTE With res pect to 060 3 compone nts, avoid th e no…

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SIPLACE 80S-20/F4/F5 User Manual 5 Vision Functions
05/99 Issue from Software Version SR.405.xx 5.7 Guidelines for Describing Package Forms
Line engineer 5 - 149
5.7.8.4 Testing Illumination Settings
You can set the illumination parameters by calling the ’Illumination’ option (see Section 5.6.4.8, Page 5 - 105).
Using the 'Measure Component Option' you can then measure the component and check your settings with
the aid of the measurement results.
Proceed as follows to test your illumination setting:
Using the illumination values suggested in Fig. 5.7.11 carry out measurement. Measurement should run
through successfully.
For each level reduce the set brightness level by 50 %.
Measurement should run through successfully.
For each level raise the set brightness level by 50 %.
Measurement should run through successfully.
If you are not successful with the above procedure, proceed as follows:
Starting with the suggested illumination value, increase the brightness of each individual illumination level
for as long as measurement is still successful.
Find this upper limit value for each individual illumination level in turn.
Starting with the suggested illumination value, decrease the brightness of each individual illumination level
for as long as measurement is still successful. Find this lower limit value for each individual illumination
level in turn.
Determine the average value of the upper and lower limit values. This will be the optimum illumination
value.
Example of an illumination test:
– Settings from the diagram:
flat: 150
steep: 180
– Measure the component. Measurement is successful.
– Reduce setting values by 50%.
flat: 75
steep: 90
– Increase setting values by 50%.
flat: 225
steep: 255
– Measure the component. Measurement is successful.
– Reset the settings to the suggested values:
flat: 150
steep: 180
¬ optimum setting
5 Vision Functions SIPLACE 80S-20/F4/F5 User Manual
5.7 Guidelines for Describing Package Forms 05/99 Issue from Software Version SR.405.xx
5 - 150 Line engineer
NOTE
With respect to 0603 components, avoid the nozzle being displayed during imaging. If this seems likely,
remove the component from the nozzle and use the ’Illumination Option’ on Page 105 to see whether the noz-
zle did appear in the image.
5.7.8.5 General Information on Setting Illumination Values
– As a rule it is better to overilluminate the component than to underilluminate it. A saturated image is prefer-
able to a low-contrast image.
– Optimum illumination is attained when only the leads are imaged and the component body is not shown.
– If you cannot clearly separate the image of the component body from the leads, we recommend to illumi-
nate body and leads equally and then to measure the outline.
5.7.9 Setting the component illumination on the 6-nozzle revolver head
camera (vision system for flip-chips, bare dies, etc. - DCA option)
5.7.9.1 General Information on Illumination Methods
The idea of illumination setting is to obtain an image of the leads of a component which is as high-contrast as
possible. At the same time it is also important to suppress representation of the body of the component.
These instructions are intended to help you find the best possible illumination parameters. This, however,
does not imply that you rigidly comply with the values specified in these instructions. The way you should pro-
ceed is first to follow these instructions and then to adjust the parameters yourself where necessary. It may
well be that you come across one or other component the leads of which are better illuminated using values
different to the ones suggested in these instructions.
The illumination system comprises four different illumination levels. The intensities can be programmed indi-
vidually. By using the individual illumination levels one at a time or in combination with one another you can
adapt the illumination to suit a wide range of components.
X plane illumination level
The X plane illumination level is ideally suited for use with flip-chips, µBGAs and melf components. It high-
lights balls particularly clearly.
Flat illumination level
The flat illumination level is used for illuminating BGAs, µBGAs, flip-chips, J-lead components (PLCC), Melfs
and components with convex-type leads. It tends to emphasize body and lead edges. It is, however, less suit-
able for displaying bright component bodies and ceramic components.
SIPLACE 80S-20/F4/F5 User Manual 5 Vision Functions
05/99 Issue from Software Version SR.405.xx 5.7 Guidelines for Describing Package Forms
Line engineer 5 - 151
Middle illumination level
The middle illumination level can be used universally with a wide range of components. With bright compo-
nent bodies, ceramic components, µBGAs and flip-chips it should, however, only be used at lower intensity
levels.
Steep illumination level
The main application for the steep illumination level is for reflective leads, ceramic components and bright
component bodies. It is less suitable for bare dies, flip-chips or µBGAs.
NOTE
Most components will require a combination of these three illumination levels to achieve optimum illumination.
Using
one
illumination level will only be successful in exceptional cases.
5.7.9.2 Pseudo color representation
The pseudo color representation provides a powerful and objective assessment of the illumination, by repre-
senting a brightness value in a color.
A contrast of at least 4 color scales between the lead and body is required for a measurement. In the ‘Illumina-
tion’ menu of the package form manipulator, components are displayed in the pseudo color representation on
the station computer monitor.
Color scale Brightness
white light
yellow
orange
red
brown
green
light blue
blue
violet
black dark
Tab. 5.7.6 Conversion table for the pseudo color representation at the 6x revolver head