80S-20用户手册.pdf - 第490页

11 Station extensions /Hardware SIPLACE 80S-20 /F4 User Manual 11.5 Ceramic substrate centering Software v ersion SR.407.xx 01/2001 US Edition 490 Fiducial s tructure 11 Recommenda tion 1 Fiduci al structure Black res is…

SIPLACE 80S-20/F4 User Manual 11 Station extensions /Hardware

Software version SR.407.xx 01/2001 US Edition 11.5 Ceramic substrate centering

489

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 SIPLACE 80S-20/F4 User Manual

11.5 Ceramic substrate centering Software version SR.407.xx 01/2001 US Edition

490

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.

SIPLACE 80S-20/F4 User Manual 11 Station extensions /Hardware

Software version SR.407.xx 01/2001 US Edition 11.6 Nozzle changer for the Pick&Place head

491

11.6 Nozzle changer for the Pick&Place head

11.6.1 Overview

Fig. 11.6 - 1 Mounting position of the nozzle changer for the Pick&Place head

(1) Magazine for 5 nozzles

(2) Reject bin

(3) Mounting plate