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User Manual SIPLAC E F5 HM 7 Options Software Vers ion SR.408.xx 03/2006 U S Edition 7.6 Multicolor PCB camera (t ype 18) 197 7.6 Multicolor PCB ca mera (type 18) 7.6. 1 Gene ral As an op tion, a multicolor PCB cam era c…

7 Options User Manual SIPLACE F5 HM

7.5 Ceramic substrate centering Software Version SR.408.xx 03/2006 US Edition

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7.5.4.2 Fiducial structure

Recommendation 1

Fiducial structure Black resistive paste as the background. Conductive paste printed on it as the

fiducial.

Recommenda-

tion

Background 0.75 mm larger than the fiducial on all sides.

Method of illumi-

nation

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 overprint-

ed with passivated glass 4330.

Method of illumi-

nation

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

background.

Method of illumi-

nation

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

necessary to teach every circuit separately.

Assessment Recommended under certain conditions.

User Manual SIPLACE F5 HM 7 Options

Software Version SR.408.xx 03/2006 US Edition 7.6 Multicolor PCB camera (type 18)

197

7.6 Multicolor PCB camera (type 18)

7.6.1 General

As an option, a multicolor PCB camera can be installed in place of the sub-gantry camera. The

multicolor PCB camera offers four different types of illumination. This greatly increases fiducial de-

tection and thus the centering accuracy.

Fig. 7.6 - 1 Multi-color PCB camera

7.6.2 Types of illumination for the multicolor PCB camera

The following types of illumination can be selected on the multicolor PCB camera:

– Standard lighting

This mixture of white and infrared lighting can be used to detect a broad range of fiducials. The

image contrast can be improved by varying the illumination, thus optimizing the centering of

different fiducials.

– White lighting

This type of illumination is used for standard PCBs with tinned fiducials.

7 Options User Manual SIPLACE F5 HM

7.6 Multicolor PCB camera (type 18) Software Version SR.408.xx 03/2006 US Edition

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– Blue oblique lighting:

In most cases, this can be used to greatly improve the contrast with bright fiducials on a light

base material, such as ceramic or CEM (c

omposite electrochemical materials). Fiducials cov-

ered with solder resist can also be detected better on a light background.

– Infrared lighting

This type of illumination is particularly useful for fiducials that are covered with solder resist or

for fiducials on flex materials. It is also sometimes possible to improve detection of silver/plat-

inum fiducials on ceramic. This should be tested by carrying out a test centering or placement

run.