VI User Manual.pdf - 第190页

Tools library 7 - 28 Vision 2007 4.10 User Manual Re v 01 7.6.2.2 BGA test Click on Test ( A ) button to apply all the inspection pa- rameters to the model. Score ( B ): score of the tested tool (rate of detection suc- c…

Tools library

Vision 2007 4.10 User Manual Rev 01 7 - 27

7.6.2.1 BGA parameters

General section

Select the Color (A) of the

component to determine the

edge polarity.

If necessary indicate the Off-

set X & Y (mm) (B) from CAD

position.

Angle tab

Contrast (C): minimum contrast transition.

Side (D): side of BGA to test.

Angle (°) (E): search angle.

Step (°) (F): search angle accuracy.

Filter half size (mm) (G): filter half size of edge.

Width (mm) (H): width of turning edge.

Press Test ( I ) button to test the angle detection.

Angle test result (J).

Width & height tabs

The parameters are the

same for Width and Height

detection.

Expected width (mm) (K) of

the component.

Tolerance (mm) (L) on ex-

pected width.

Width or Height test result (M).

If you have not tested the

Angle

before,

Width

and

Height

are tested at 0°.

A B

BGA

Tools library

7 - 28 Vision 2007 4.10 User Manual Rev 01

7.6.2.2 BGA test

Click on Test (A) button to

apply all the inspection pa-

rameters to the model.

Score (B): score of the tested

tool (rate of detection suc-

cess).

dX&Y(mm) (C): position in X and Y between the transitions (centre between the 2 tran-

sitions).

dT(d°) (D

): position result in theta of the tested model.

Contrast (E): difference of a transition, in gray level values between background bright-

ness and component brightness. This value is the average of the transition contrast

found during the test.

T (ms) (F): inspection time.

If only one transition is looked for, this is the position of the transition found.

Angle and postion detections

The BGA angle is detected by a turning edge. This edge re-

turns the angle that gave the best contrast in its search angle.

BGA position detection is returned by 2

double transition edges.

These 2 double transition edges return the

X and Y position of the BGA component.

B C D E F

Scoring by size

and contrast

BGA

Tools library

Vision 2007 4.10 User Manual Rev 01 7 - 29

7.7 SO or QFP model

7.7.1 Joints detection

Joint inspection is the ability to check if there is solder or not. This tool does not consider quality. The

solder reflect few light to camera when the solder is good, and many when the solder is not good.

Histogram is used to perform joint inspection.

7.7.1.1 Good joint

With solder the reflection is out of the camera, which

causes a black area at the end of lead.

7.7.1.2 Bad joint

The curve of a bad joint weld reflects the major light

flux at the vertical of the solder.

7.7.1.3 No joint

Without solder the reflection is directly inside the

camera which causes a very bright area at the end

of lead.

7.7.2 Solder joint detection

The bridge tool allows inspection of bridges between 2 leads of SO or

QFP components.

Edge is used to perform bridge detection.

There are 2 equation fields in the Edit a model window for de-

tecting joints and solder bridges.

If you want to detect weld joints on small SMCs, like the 0603 or

0402, place a histogram at the end of the component. The equa-

tion in the Joint field will be R2 and R3 if your histograms are pro-

grammed in windows 2 and 3. If you use direct lighting, bad

solder will be very shiny and good welding will be dull.

This enables the presence or absence of joints to be checked.