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6 Vision functions SIPLA CE 80S-20/F4 User Manual 6.7 Guidelines for Describing Package Forms Software version SR.407.xx 01/2001 US Edition 354 6.7.7 Setting the Component Illumination on the Fine Pitch V ision Module 6.…

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SIPLACE 80S-20/F4 User Manual 6 Vision functions
Software version SR.407.xx 01/2001 US Edition 6.7 Guidelines for Describing Package Forms
353
– Measure the component. Measurement is successful.
– Reset the settings to the suggested values:
flat: 170
middle: 60
steep: 120
© optimum setting
NOTE 6
With respect to 0402 and 0603 components, avoid the nozzle being displayed during imaging. If
this seems likely, remove the component from the nozzle and use the ’Illumination Option
’ (see
page 311 to see whether the nozzle did appear in the image.
6.7.6.6 General Information on Setting Illumination Values
– As a rule it is better to overilluminate the component than to underilluminate it. A saturated im-
age is preferable 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 recom-
mend to illuminate body and leads equally and then to measure the outline.
6 Vision functions SIPLACE 80S-20/F4 User Manual
6.7 Guidelines for Describing Package Forms Software version SR.407.xx 01/2001 US Edition
354
6.7.7 Setting the Component Illumination on the Fine Pitch Vision Module
6.7.7.1 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. 6
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 proceed is first to follow these instructions and then to adjust the parameters your-
self where necessary. It may well be that you come across a component where the leads are better
illuminated using values different than the ones suggested in these instructions. 6
The illumination system consists of three different illumination levels. The intensities can be pro-
grammed individually. By using the individual illumination levels one at a time or in combination,
you can adapt the illumination to suit a wide range of components. 6
Flat illumination level 6
The flat illumination level is used for illuminating BGAs, J-lead components (PLCC) and compo-
nents 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. 6
Middle illumination level 6
The middle illumination level can be used universally with a wide range of components. With bright
component bodies, ceramic components, µBGAs and flip-chips it should, however, only be used
at lower intensity levels. 6
Steep illumination level 6
The main application for the steep illumination level is for reflective leads, ceramic components
and bright component bodies. It is less suitable for reflective component bodies, flip-chips or
µBGAs. 6
NOTE 6
Most components will require a combination of these illumination levels to achieve optimum illu-
mination. Using one illumination level will only be successful in exceptional cases.
SIPLACE 80S-20/F4 User Manual 6 Vision functions
Software version SR.407.xx 01/2001 US Edition 6.7 Guidelines for Describing Package Forms
355
6.7.7.2 Pseudo color representation
The pseudo color representation provides a powerful and objective assessment of the illumina-
tion, by representing a brightness value in a color. 6
A contrast of at least 4 color scales between the lead and body is required for a measurement. In
the ‘Illumination’ menu of the package form manipulator, components are displayed in the pseudo
color representation on the station computer monitor. 6
6.7.7.3 Settings for Illuminating Standard Components
The standard range of components includes tantalum capacitors, PLCCs, QFPs, SOs, SOJs,
TSOPs, ICs, power components and BGAs. 6
For the components which are listed below the GF interpreter in the station computer uses the
default illumination parameters listed in Fig. 6.7 - 9
: 6
– Tantalum capacitors (component bodies, non-reflective)
– PLCC, QFP, SO, SOJ, TSOP, ICs, power ICs
– BGAs (not ceramic BGAs)
As a rule you will not need to change the illumination parameters for the standard components.
For all other components you will need to determine the illumination values and test them (see
Section 6.7.7.4
on page 350). 6
Color scale Brightness
white light
yellow
orange
red
brown
green
light blue
blue
violet
black dark