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Component Shapes Specific Component Shapes Optical Re cognition and Evaluation of Leaded COs S tudent Guide SIPLACE V ision (Customer) Component Shapes Edition 12/2008 EN 84 Lead inspection of tab (heat sink) i n recogni…

Component Shapes

Optical Recognition and Evaluation of Leaded COs Specific Component Shapes

Student Guide SIPLACE Vision (Customer)

Edition 12/2008 EN Component Shapes

5.3.8.2 Recognition of Very Wide Leads

Heat sink (tab) and ground connection leads are often produced as overwide leads. They need to be

included in the programming, otherwise the angle calculation step will deliver incorrect results, if there

are too few leads on the opposite side or if the lead rows are too short.

Recognition step Coarse position 1

This step measures the outer edges (1) with the

help of brightness evaluation, performed vertically

to the lead in the region around the light blue Vs.

This step also determines the lead center (2) at the

outer edge in the left measurement window (the

same procedure is used for coarse/fine position 2

in the right-hand window).

Finally, the left side edge is determined. The

procedure here is to set the image point pairs so

low that the normal slant of the side edge is not

included in the measurement.

Recognition step Fine position 1

Several point pairs are now used to determine a

fine position and fine angle, within the position

defined during the step Coarse position1.

As described for SO components, the same

process is applied to the leads in group 2.

Lead inspection is then performed for the

recognized lead positions.

Component Shapes

Specific Component Shapes Optical Recognition and Evaluation of Leaded COs

Student Guide SIPLACE Vision (Customer)

Component Shapes Edition 12/2008 EN

Lead inspection of tab (heat sink) in

recognition step Lead tip1

The yellow areasmark the results window (1)

with brightness and gradient characteristics.

The red measurement window is where the

brightness is determined from bottom to top. This

is then entered in the results window (light green)

from left to right.

The brightness gradient (alteration) is used to

calculate the position of the lead outer edge

(orange).

Lead inspection of tab (heat sink) in

recognition step Lead width1

The system scans the red measurement window

in a horizontal direction, searching for regions of

brightness (light green ). The evaluation and

marking of results will be displayed accordingly, as

in the diagram.

Lead inspection is performed as described for SO

components.

Component Shapes

Components With Round Leads Specific Component Shapes

Student Guide SIPLACE Vision (Customer)

Edition 12/2008 EN Component Shapes

5.3.9 Components With Round Leads

Ball Grid Arrays or Ceramic Column Grid Arrays have various round connection points under the body

surface. In the initial step, up to 20 features are applied in the CO corners, to determine the coarse and

fine positions (including the angle). The recognized CO position and angle are then checked to ensure

that all leads are present and in the correct position on the grid.

5.3.9.1 BGA Component Shape (Ball Grid Array / FlipChip)

JEDEC description

Lead description

 The leads are distributed throughout the CO surface, as hemispherical contacts which are arranged

in a matrix . This component shape has so-called Ball leads.

 The ball diameter and ball tolerance must be identical for all groups.

Special features

The ball quality is set to only 66%, due to the ceramic BGAs. For a reliable ball check on normal BGAs,

we recommend raising this value to 70-80% in the algorithm menu.

Joint datasets with ICOS data possible –

(see MS-034)

Body description: rectangular.

 The Z height of the body determines the CO height for the

Z positioning profile.

 The X/Y body dimensions determine the field of vision, the

Region of Interest.

 The body size should be adjusted to reflect the real body

size and not just cover the size indicated by the ball leads.

 This component shape has hemispherical leads arranged

in columns and rows. It can contain one or more groups.

 Leads may be missing in the rows or columns.

 The (pitch) and pitch tolerance for the ball arrangement

must be identical in all groups.

The pitch is greater than the ball diameter, even with

individual balls.

 The contrast between the body and the Ball lead can be set

as required. Normally, the Ball lead is brighter than the

body.

 The standard flat illumination for BGAs only illuminates the

hemispherical Ball leads and not the flat connection circles

on the body. A special filter has been programmed for this

purpose.

 You can also select an option for inspection of ball

presence and arrangement.