SIPLACE S-23 HM.pdf - 第409页
User Manual SIPLACE S-23 HM 11 Station extensions / hardware Software Version SR.406.xx 02/00 US Edition 11.5 Ceramic substrate centering 409 PLEASE NOTE Oblique lightin g can onl y be used on the “sub-gantr y came ra”. …
11 Station extensions / hardware User Manual SIPLACE S-23 HM
11.5 Ceramic substrate centering Software Version SR.406.xx 02/00 US Edition
408
11.5.4 Technical data
11.5.5 Optical centering with oblique lighting
11.5.5.1 General
For optical centering, the special features of the ceramic substrate must be taken into account.
The contrast depends very much on the paste used for the adjustment structure, the clear area
surrounding the adjustment structure, and the type of illumination. 11
The oblique lighting unit is located on the front part of the sub-gantry camera. 11
Fig. 11.5 - 3 Oblique lighting unit for the sub-gantry camera
11
Oblique lighting may be switched on instead of the existing lighting (see table in Section Abschnitt
11.5.2). 11
Substrate format 50 mm x 50 mm to 100 mm x 180 mm
Substrate thickness 0.5 mm to 1.5 mm
Substrate model unscribed (without problems)
scribed (requires testing)
Support on the conveyor 2.5 mm
Optical centering: field of view of the PCB vision module
Type of illumination for light pastes:
Type of illumination for dark pastes and close spacing to
adjacent structures (> 1 mm)
5.7 mm x 5.7 mm
PCB vision module (standard)
Oblique lighting (option)
Fiducial criteria See PCB vision module position recog-
nition
Mechanical centering:
X/Y centering accuracy ± 0.07 mm / 4 sigma
PCB underside clearance 12 mm
Compressed air connection 5.5 bar
User Manual SIPLACE S-23 HM 11 Station extensions / hardware
Software Version SR.406.xx 02/00 US Edition 11.5 Ceramic substrate centering
409
PLEASE NOTE
Oblique lighting can only be used on the “sub-gantry camera”. 11
11.5.5.2 Fiducial mark recommendation for ceramic substrates
The contrast between the carrier package material and the circuit-board conductor layer is gener-
ally very small with ceramic substrates. The fiducials must therefore be selected with regard to
certain criteria concerning the fiducial shape and structure. Recommended fiducial shapes and
structures are given below. 11
Fiducial shape 11
We recommend a rectangle or square with an edge length of > 1 mm, and a clearance
of > 0.5 mm. 11
11
Fig. 11.5 - 4 Recommended fiducial shape
PLEASE NOTE
Single crosses are also suitable, but they take up more space. 11
0.5 mm
1.0 mm
11 Station extensions / hardware User Manual SIPLACE S-23 HM
11.5 Ceramic substrate centering Software Version SR.406.xx 02/00 US Edition
410
Fiducial structure 11
Recommendation 1
Fiducial structure Black resistive paste as the background, with conductive paste printed on it as
the fiducial.
Recommendation Background 0.75 mm larger than the fiducial on all sides.
Method of illumination Normal light
Advantage Good contrast, good sharpness;
Reference Circuit-board conductor layer
Assessment This combination gives the best results. Highly recommended.
Recommendation 2
Fiducial structure Fiducial made from circuit-board conductor material, e.g. 6119, and overprinted
with passivated glass 4330.
Method of illumination Oblique light
Advantage No additional steps required
Reference Circuit-board conductor layer
Assessment Fiducials are less sharp than for recommendation 1. Recommended.
Recommendation 3
Fiducial structure Fiducials made from circuit-board conductor layer against a free ceramic back-
ground.
Method of illumination Oblique or normal light (depending on the paste)
Advantage No additional steps required
Reference Circuit-board conductor layer
Note Fiducials are less sharp than for recommendation 2.
The fiducial image depends on the surrounding free surface. It may be neces-
sary to teach every circuit separately.
Assessment Recommended under certain conditions.