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Component Shapes Lead Shapes Component Shape Description Rules S tudent Guide SIPLACE Vision (Customer) Edition 12/2008 EN Component Shapes 47 The group offset from the body center to the center of th e lead group is spe…

Component Shapes

Component Shape Description Rules Lead Shapes

Student Guide SIPLACE Vision (Customer)

Component Shapes Edition 12/2008 EN

5.2.1 Lead Shapes

The lead shapes generally have predefined English names.

Gullwing, J-Lead, Wraparound, Ball (for BGAs) and Column are the most common examples.

Lead angle

The lead angle is the angle at which the lead protrudes from the component body. Leads which point

towards the Y-axis (upwards) have an angle of 0°, although 90° was defined in the line computer CS

Editor.

The lead angle specified in SIPLACE Vision depends on the lead type. You need to specify the position

of the lead end.

The diagrams below each show the edge of a component body, with leads. The orientation of the lead

end in its 0° position is marked with a dot.

Blob - special features

The Blob (binary large object ) stands for a lead shape or structure which is saved as a graphic. It can

not be adequately described with the typical dimensions (e.g. lead width and length). In this case,

SIPLACE Vision automatically determines the characteristic contours for measuring the structure.

Overview of lead shapes

Gullwing: J-Lead: Wraparound: Blob:

Lead shape Typical CO Comment / special features

Wraparound: Chip / Melf /

(Moulded)

The surface or metal surface (often as wide as the body) of

this lead shape is folded around the edge of the component

(except with the type Moulded).

Wraparounds are defined only by the visible lead length. This

can be dark or bright!

The ends of the Wraparounds may contain notches, see

Gullwing.

Gullwing: Soxx / QFP The JEDEC description JESD30-B applies for this lead

shape. This indicates a thin lead, which is curved from the IC

surface to the contact surface. The contact length is always

shorter than the lead length. The ends of the Gullwing leads

may contain notches, in which case the CO can be described

as nonstandard.

J-Lead: PLCC / SOJ The J-shaped pins are curved into cavities under the body

surface. Only select this if the pins have the correct shape. J-

Leads are defined only by the visible lead length.

Balls: BGA Hemispherical leads under the CO body surface.

Columns: CCGA Column-shaped lead points under the component body

surface.

Component Shapes

Lead Shapes Component Shape Description Rules

Student Guide SIPLACE Vision (Customer)

Edition 12/2008 EN Component Shapes

The group offset from the body center to the center of the lead group is specified for components with

lead groups.

The reference point for group descriptions is the body center *, as this is calculated during optical

centering for the so-called Best Placement and is then moved by the machine into the placement

position.

A group offset is specified as the distance from the body center to the group center.

When the group center is positioned on a CO symmetry axis, one of the X or Y offset values will be equal

to 0.

Blob: Electromechanical

nonstandard

Irregular lead surfaces with non-assignable geometry. These

are described by a rectangle enclosing them.

Polygon circle: Shields / Socket

(Nonstandard)

Circles are specified as Polygon circles (multiple corners

such as circles), since the circle is depicted with the use of

tangents.

Corners: Shields

(Nonstandard)

Corners on the Shield edges or on the unleaded CO sides of

nonstandard/Socket shapes.

The virtual leads displayed by ICOS and the arrows shown

in the SIPLACE Vision depiction of corners are both marked

in the CS.

Pins with notch Nonstandard only Lead evaluation filters are not set for the notch region.

Centering pins

(for SIPLACE Vision only)

Nonstandard only The height of the centering pin is added to the component

height without leads. Optical recognition is not performed. (In

future SW versions, the centering pin height could also be

used for slow position of the Z axis down.)

Rectangle

(from 702 SIPLACE Vision

4.1 only)

Nonstandard only Rectangular features visible with the illumination for lead

features can be an additional help for optical centering. This

might even be the entire component outline.

Legend

1. Group 1 offset

2. Group 2 offset

The group offset from the body center to the center of the lead group is specified for

components with lead groups. However, these groups can be outside the CO symmetry

axes, in which case neither the X or Y offset values will be equal to 0.

Note: The component pickup point can be separately programmed in SIPLACE Pro 3.x.

This involves programming the pickup coordinates to the body center (for both Vision

systems).

In the case of special shapes (e.g. single-row component shapes), take care that the

values for the lead group offsets are correct. To ensure that the CO is correctly picked

up by the feeder, you need to also program an eccentric position in the feeder.

Lead shape Typical CO Comment / special features

1 2

Component Shapes

Component Shape Description Rules Key Placement Accuracy Points

Student Guide SIPLACE Vision (Customer)

Component Shapes Edition 12/2008 EN

5.2.2 Key Placement Accuracy Points

When describing component shapes, observe the following points for correct placement:

 The group offsets describe the offset for a group of visible features, on the basis of which the body

center is calculated for the placement procedure. Make sure that the group offsets have the same

values for all components which are symmetrical to the center axes.

 The correct offset values will need to be calculated for those components which are not

symmetrically aligned around the center axes (see D-Packs). In this case, the body dimensions

should reflect the actual dimensions, to simplify evaluation of CS tests.

The measurement analysis shown on the screen helps you to assess whether the group offset

values really have the correct dimensions to the body center, thereby ensuring placement accuracy.

ALWAYS check that placement on the board is accurate, as the CAD layout system generally

determines the placement coordinates symmetrically to the center of the pad positions on the PCB.

 When programming, we recommend that you first correct the CS dimensions and then shift these

onto the outer edges of the body. Subsequently, check the lead lengths and group offsets with the

help of the evaluation diagram and the correlation with the camera image.

 Inspection mode allows shape-specific tests, such as the evaluation of body sizes in SIPLACE Vision

(ICOS systems only check this parameter with a SIZE measurement). This prevents COs (Chip

shape) from being placed in an upright position. For this test to work, make sure that the CO body

dimensions have been described correctly and the tolerance description is precise (the lead

dimensions are also processed in inspection mode for molded shapes)!

 The lead spacing is also checked for all Leaded component shapes.

5.2.3 Processing Data

 When programming the camera, do not forget to set the max. field of vision (FOV) data and the

smallest possible lead/Ball structure or smallest pitch (see camera overview at the end of this

document).

 The C&P nozzles have various lengths, so that the bottom edge of the CO can be optimally

positioned in the focal range of the placement head CO camera. A deviation from this is calculated,

displayed and taken into account in the measurement algorithm with C&P head component cameras.

 For optimum processing of COs during the placement procedure, the acceleration and delay values

can be reduced for all axes.

 In addition, the pick and place procedure can be optimized by selecting one of the various positioning

profiles for the Z-axis (Pickup - contactless; Placement - with very high force; Placement - slow

braking; Slow start;...).

 Components smaller than 6 mm should be processed with the pickup mode Early Vacuum .

 Feeder data can be set as default data for the CS (pickup offset ; pickup tolerance; CO availability

time (waiting time ) for the feeder pitch; COs per reel;...). If feeder information has been programmed

for a CO, this will be prioritized for the setup.

 If the pickup tolerance data from the feeder is specified illogically high, this could have a negative

effect on the measurement procedure (feature search range will be too great).

ATTENTION:

Shifting the group offset values means that the centering procedure in the ICOS

system will now apply a placement offset identical to the value entered.