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2 Retrofit Instructions for PCB Camera Multicolor, HS-50 / HS-60 SIPLACE HS- 50/HS-60 2.93 Illumination Setting 11/2004 Edition 74 2.93.2 Orient ation Aid f or Selecting Illuminati on The foll owing table is der ived fro…

SIPLACE HS-50/HS-60 2 Retrofit Instructions for PCB Camera Multicolor, HS-50 / HS-60

11/2004 Edition 2.93 Illumination Setting

2.93 Illumination Setting

: Adjust the illumination setting at the station to the current substrate to be placed, proceeding

as described below.

2.93.1 Possible Illumination Settings and Selection Criteria

The following types of illumination are possible with the PCB camera Multicolor by using the per-

tinent setting (see Abschn. 2.12.3): 2

– Standard light:

Using this mixture of white and IR light it is possible to recognize a broad range of fiducials. By

selecting special types of illumination, the contrast of the image can be improved and, as a

consequence, the range of recognizable fiducials increased.

– White light:

This is used for standard PCBs (tinned fiducials).

– Blue oblique illumination:

By using this light, an obvious improvement in contrast can usually be attained where bright

fiducials on a light base material are involved, e.g., on ceramic or CEM. In a few instances,

fiducials covered by solder resist can also be recognized better on a light background.

–IR light:

It is usually practical to use this type of illumination for fiducials that are covered by solder resist

or for fiducials on flex material. It may also be possible to improve recognition where silver-pla-

tinum fiducials on ceramic are involved. Ascertain this in advance by conducting a trial cen-

tering and/or a trial placement.

2 Retrofit Instructions for PCB Camera Multicolor, HS-50 / HS-60 SIPLACE HS-50/HS-60

2.93 Illumination Setting 11/2004 Edition

2.93.2 Orientation Aid for Selecting Illumination

The following table is derived from empirical values and is therefore only to serve as an orientation

aid. A few materials often exhibit very drastic fluctuations (particularly in the case of CEM1), the-

refore the best illumination has to be ascertained through testing. In each instance this is done by

selecting the setting for illumination during the course of a sample placement with recognition of

the position of the pertinent PCBs or ceramic substrates. 2

2.93.3 Setting the Illumination

The best illumination selection must be ascertained by using the function "Test fiducials" or the

substrate to be populated. 2

NOTE:

The processes which must be executed prior to setting the illumination are described in detail in

the section "Teaching Fiducials" or "Teaching Synthetic Fiducials" of the User Manual, Software

version SR 502.xx.

During them, the current substrate or PCB is moved onto the processing belt of the conveyor and

mechanically centered / clamped in place. 2

Base material Fiducial material Oblique illu-

mination

BLUE

Infrared

light

White light

FR 4 Tin x

Ceramic NiAu, Cu, AgPl x

Ceramic AgPt x

CEM1 Bright copper fiducials,

tin

CEM1 Fiducials covered by sol-

der resist

(x) x

Flex on alumi-

num carrier

SIPLACE HS-50/HS-60 2 Retrofit Instructions for PCB Camera Multicolor, HS-50 / HS-60

11/2004 Edition 2.93 Illumination Setting

: Select the ICON "Setting illumination"

: In the "illumination" menu select the "Setting illumination" button.

The following screen will appear:

Fig. 2.13.1 Screen: "Setting the Illumination"

NOTE:

Utilize Abschn. 2.12.2 and the table in Abschn. 2.12.3 to select the best type of illumination. 2

: Select the desired illumination level by activating the pertinent radio button.

: Select complete or reduced brightness by activating or deactivating the rectangular field.

: Select the button "Positioning the gantry" and position the gantry over the fiducial that is cur-

rently to be recognized / tested.

: Check the quality of the image on the vision screen (see the section "Teaching Fiducials" in the

User Manual).

: If the image of the fiducial is still not optimal, select another illumination level or, if appropriate,

change the brightness too and select the button "Positioning the gantry" again.

: If the image of the fiducial is alright, select the button "OK".

As a result, the illumination set is accepted for all 4 gantries.