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6. Inspections following SMT sequences

In the SMT assembling process there are three main phases where AOI plays an important

role; after-paste printing, component placement and soldering. In the case of wave, r selective

or partial soldering there are other sequences e.g. glue dispensing, through-hole component

insertion etc. But SMT processes are used mainly for inspection in discussions about this

method of assembly. Possible locations where AOI can be placed in an SMT line are: the post-

paste, post-placement or pre-reflow and post reflow (Fig. 3.).

At each location AOI appliances have a special name. These are: Solder Paste Inspection (SPI,

also known as Post-Printing Inspection), Automatic Placement Inspection (API. also known

as Post-Placement Inspection) and Post-Soldering Inspection (PSI). The AOI systems able to

inspect each manufacturing sequence are called: Universal AOI (UAOI). If there is a possibility

that the equipment can inspect the finished product optically, it is then called the Automatic

Final Inspection (AFI).

Manufacturer Amistar Automation Inc.

Model

K5L doutech Excalibur phasor redline LD 6000

Board size max.

[mm x mm]

510 x 410 610 x 760 610 x 760

760 x 760

(extended:

1000 x 2000)

610 x 760

(extended:

915 x 1525)

Board size min.

[mm x mm]

50 x 50 n.a. n.a. n.a. n.a. n.a.

Board thickness

[mm]

0.5 - 3.0 n.a. n.a. n.a. n.a. n.a.

Board warp [mm]

+ 0.5; - 1.0 n.a. n.a. n.a. n.a. n.a.

Board clearance

top [mm]

50 n.a. n.a. n.a. n.a. n.a.

Board clearance

bottom [mm]

50 n.a. n.a. n.a. n.a. n.a.

Camera type

CCD n.a. n.a. n.a. n.a. n.a.

Illumination

3-stage LED dome lighting

(Upper: IR; Middle: WH;

Lower: WH)

n.a. n.a. n.a. n.a. n.a.

View size [mm]

30.4 x 22.8 500 x 635 500 x 610

500 x 635

(extended:

915 x 1980)

500 x 635

(extended:

1000 x 2000)

500 x 610

(extended:

865 x 1475)

Resolution [µm]

19 50 50 60 50 n.a.

Inspection time

0.45 sec/screen 20 - 60 sq. m/h 45 sq. m/h n.a. 20 - 60 sq. m/h

15 sec @ 3/3

mil line/space;

27 sec @ 2/2

mil line/space

(for 480 x 600

mm board size)

Applicability

missing components, position

shift, rotation error, wrong

components, polarity check,

bridge, character recognition

functional and

cosmetic faults

functional and

cosmetic faults

functional and

cosmetic faults

functional and

cosmetic faults

functional and

cosmetic faults

Lloyd Doyle Limited

Table 1. Comparison of Automatic Optical Test (AOT) machines

Automatic Optical Inspection of Soldering

http://dx.doi.org/10.5772/51699

391

1 2 3 4 5 6 7 8 9 10 ... 55 56

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