00191297-02 - 第299页
User Manual S-23 HM 6 Vision functions Software Vers ion SR.405.xx 05/99 Issue 6.7 Guidelines for Describing Package Form s 297 6.7.6.2 Pseudo color repr esent ation The pseudo co lor rep rese ntation prov ides a powerfu…
6 Vision functions User Manual S-23 HM
6.7 Guidelines for Describing Package Forms Software Version SR.405.xx 05/99 Issue
296
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, 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 suitable for displaying bright component bodies and ceramic compo-
nents. 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 three illumination levels to achieve optimum
illumination. Using
one
illumination level will only be successful in exceptional cases. 6
User Manual S-23 HM 6 Vision functions
Software Version SR.405.xx 05/99 Issue 6.7 Guidelines for Describing Package Forms
297
6.7.6.2 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
6.7.6.3 Settings for Illuminating Standard Components
The standard range of components includes chips (0402 to 2220), tantalum capacitors, Melf com-
ponents, PLCCs, QFPs, SOs, SOJs, TSOPs, ICs, power components, flip-chips, µBGAs 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 - 7: 6
– Chips (0402 to 2220)
– Tantalum capacitors (component bodies, non-reflective)
–Melf
– PLCC, QFP, SO, SOJ, TSOP, ICs, power ICs
– Flip-chips, µBGAs, BGAs (not ceramic BGAs)
Color scale Brightness
white light
yellow
orange
red
brown
green
light blue
blue
violet
black dark
Tab. 6.7.2
6 Vision functions User Manual S-23 HM
6.7 Guidelines for Describing Package Forms Software Version SR.405.xx 05/99 Issue
298
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 6.7.6.4 on page 298). 6
6
Fig. 6.7 - 7 Illumination parameters for standard components at the 12x revolver head camera
6
6
6.7.6.4 Settings for Illuminating Other Components
Fig. 6.7 - 8 presents a list of the illumination settings for other components. 6
flat: 255
middle: 90
steep: 60
Diagram for adjusting the illumination of standard components
Chip
IC
Power ICMelf
BGA, µBGA
flip-chip
Tantalum
capacitor
BGA,
µBGA,
flip-chip
0805 and
larger
0402,
0603
Light
General
flat: 120
middle: 40
steep: 170
Reflective
body
flat: 120
middle: 100
steep: 120
flat: 70
middle: 60
steep: 150
Gullwing
SO, SOT,
TSOP
QFP,
flat: 170
middle: 50
steep: 120
flat: 0
middle: 10
steep: 170
flat: 255
middle: 120
steep: 10
flat: 170
middle: 60
steep: 120
J-Lead
PLCC
flat: 80
middle: 40
steep: 120
Ceramic
BGA
flat: 0
middle: 50
steep: 255
flat: 255
middle: 20
steep: 0
Illumination
level
Brightness
150
255
Contrast
graduation