SIPLACE S-23 HM - 第410页

11 Station extensions / hardware User Manual SIPLACE S-23 HM 11.5 Ceramic subs trate centering Software Version SR.406.xx 02/00 US Edition 410 Fiducial s tructure 11 Recommenda tion 1 Fiduci al structu re Black resisti v…

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

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.

User Manual SIPLACE S-23 HM 11 Station extensions / hardware

Software Version SR.406.xx 02/00 US Edition 11.6 Feeder position recognition

411

11.6 Feeder position recognition

If the feeder modules are equipped with positioning fiducials, the fiducials can be measured.

If the "Conveyor position detection" function has been selected on the line computer, the function

will also appear in the Machine options. It can then be activated or deactivated at each station.

Fig. 11.6 - 1 Feeder position recognition

PLEASE NOTE 11

The "Feeder position recognition" function is always deactivated when the station is switched on. 11

If a track has been entered in the cluster data, the PCB camera on the feeder module will ap-

proach the position of the centering fiducial. Any centering fiducial offset determined during the

measurement will then be assigned to this track and added to the pick-up position during the pick-

up operation. 11