VI User Manual.pdf - 第206页

Tools library 7 - 44 Vision 2007 4.10 User Manual Re v 01 7.9 Profiler ™ in Custom The Profiler ™ tool, included in the Custom tool is used to detect th e lifted leads and bad joints. The meth od is based on the analysis…

Tools library

Vision 2007 4.10 User Manual Rev 01 7 - 43

7.8.6 Bridges inspection

Bridges inspection uses histograms or edges

placed between 2 leads. Each bridge inspec-

tion can have individual parameters and can be

active or not.

Select the tab (

A) of the component side to edit.

Number

(

), select the bridge number to edit.

Tick Active processing (C) to run the bridge

inspection,

Change, if necessary, in

Offset X & Y, Width

and Length (D) the tool window size and posi-

tion,

Choose to use an

Edge or an Histogram (E) to

check the solder bridge,

Light level (F) select the light level to use.

Press

Propagate >>> (G) button to propagate

the parameters to all the leads and all the

sides.

Custom

Tools library

7 - 44 Vision 2007 4.10 User Manual Rev 01

7.9 Profiler

™

in Custom

The Profiler

™

tool, included in the Custom tool is used to detect the

lifted leads and bad joints. The method is based on the analysis of

the gray level profile of each lead and joint.

When a lead is lifted, his position and his angle change. The light is

consequently reflected differently. The appearance of joint can also

change. The gray level repartition along the lead and the joint is

thus different between a lifted and a joined lead. The Profiler

™

method uses this characteristic to detect lifted leads and bad joints.

A profile is a projection onto one axis, of the gray level sum.

7.9.1 Profiler™ tool description

Profiler

™

tool works within comparison to references. Principle is to verify that profile of each

lead/joint of a component are included into tolerances.

There are 2 Profiler modes for Custom tool :

Fixed and Dynamic.

The main differences between these 2 modes are the way to set profile reference curve.

 With

Dynamic mode, for each side, profile reference curve is set with profiles average of all

leads of this side. By this way, profile reference curve is set dynamically (the user does not

have to set it) and as a result, tolerances curves are set dynamically.

 With

Fixed mode, the reference curve is set with profile curve of one lead. By this way, the

user has to set it manually.

For both mode, the profile reference curve for

Lead to lead is set with average of all leads of all

sides.

These 2 modes are constituted of 2 parts:



The

Global adjustment

tool, based on a global comparison of leads profile. 2 modes are available:

- Standard mode: which contains tolerance algorithm (see § 6.9.2 Profiler™ tool using)

Expert mode: which contains advanced algorithm

 The

Lead to lead tool, based on a comparison lead with lead on a same component. This

analysis detects leads that are not similar to the other leads of the component. It allows to

take into account variations of production. On this tool, the same 2 modes (

Standard and Ex-

pert

) are available.

These 2 parts are necessary because of the variability of a production. In fact, on a same com-

ponent, welding and lead have the same aspect. On the other hand, during production, shape

of lead and aspect of welding can change.

Lead

axis

Gradient

Lead

axis

Profile

Tools library

Vision 2007 4.10 User Manual Rev 01 7 - 45

7.9.1.1 Global adjustment tool principle

This tool is based on a comparison with fixed reference (a good lead/joint). Tolerances

are constructed in relation to this reference. This reference is defined on several good

leads. For this, a reference profile is done on a good lead, and tolerances are constructed

in relation to this reference. So they are fixed for all components of a same models. Each

profile out of tolerances is considered as bad.

7.9.1.2 Lead to Lead tool principle

This tool allows to adapt to the variations

of aspect related to a change in the pro-

duction (aspect of the welding, aspect of

the component leads…). It is not sensi-

tive to difference between components.

For the lead to lead tool, the comparison

is with the average of all profiles of the

components.

This tool is based on a comparison with

adaptive reference.

Tolerances are auto-

matically adjusted for

each component of a

same model. Toleranc-

es are adaptive.

By using these 2 methods simultaneously, bad leads can be detected on joint by taking

into account of variation of production.

Tolerance must

be large to in-

clude all possible

variations of pro-

duction (lead and

welding aspect,

lead size ...).

Tolerances

could be tight

to detect more

defects.

Bad welding

Component A

Component B

Profiler

™

in Custom

Tolerances (in black) are adapted on the profile average (in white)