80S-2080F480F4-680F5 User’s Manual - 第331页

5 Vision Functions SIPLACE 80S-20/F4/F4-6/F5 User’s Manual 5.6 Test Component Edition 03/98 from Software Version SR.404.xx 5 - 110 Line engine er Grid-d riven (component inspection with the 80F 4 , 80F 4 -6 o r 80 F 5 m…

SIPLACE 80S-20/F4/F4-6/F5 User’s Manual 5 Vision Functions

Edition 03/98 from Software Version SR.404.xx 5.6 Test Component

Line engineer 5 - 109

5.6.4.14 Information on Measurement Methods

As far as conventional components with lead connections are concerned, component centering is essentially

based on four measurement methods used to determine the position (x and y coordinates, Φ = skew) of the

component and the lead parameters:

– Size-driven mode

– Row-driven mode

– Corner-driven mode

– Lead-driven mode

For BGAs (B

all Grid Arrays) and flip-chips new algorithms have been implemented in order to determine the

position (x and y coordinates, Φ = skew) of the component and the ball parameters (see ’Measure Compo-

nent Option’ on Page 5 - 88.):

– Grid-driven mode

– Ball-driven mode

In accordance with your specifications any measurement method can be omitted from this sequence. How-

ever, it is not possible to change the way this sequence runs.

Definition of the measuring methods

Size-driven

This measurement method has been especially developed for small components. On the basis of the infor-

mation on dimension parameters the position and rotation of small components is determined rapidly and

reliably.

This method is very resistant to unwanted intrusive elements such as ink markings.

The size-driven mode also employs profiling. You can have the profile formed along either the width

the

length of the component. You should make your choice within the options field. The default selection is for

profiling along the longer side.

Row-driven

This measurement method is based on information from one row of leads.

This method is very fast and supplies approximate values for the coordinates and rotational angle of the

component.

Corner-driven (Component inspection)

The measurement results provide precise information on the coordinates and rotation of the component,

the number of leads, the pitch and the row offset.

This method is not sensitive to fluctuations in the lead dimensions.

Lead-driven (Leads inspection)

This method is used to obtain information from an inspection of every single lead.

The following combinations of measurement methods are used:

– Size-driven — corner-driven — lead-driven (see the table in Section 5.6.4.15) or

– Row-driven — corner-driven — lead-driven (see the table in Section 5.6.4.15)

5 Vision Functions SIPLACE 80S-20/F4/F4-6/F5 User’s Manual

5.6 Test Component Edition 03/98 from Software Version SR.404.xx

5 - 110 Line engineer

Grid-driven (component inspection with the 80F

, 80F

-6 or 80F

machines)

The measurement results will provide information on the approximate coordinates and approximate rota-

tion of the component. In addition, you will be informed of the quality of measurement.

Ball-driven (determining the balls position with the 80F

, 80F

-6 or 80F

machines)

The measurement results will provide precise information on the approximate coordinates and approxi-

mate rotation of the component. In addition, you will be informed of the maximum ball offset and the quality

of measurement.

5.6.4.15 Recommendations regarding the Optimum Sequence of Measurement

Methods

The following table contains our recommendations for the optimum sequence of measurement methods for

particular components. The following abbreviations are used:

B = ball-driven

C = corner-driven

G = grid-driven

L = lead-driven

R = row-driven

S = size-driven

L applies to irregularly shaped components with separate windows

Component Measurement sequence

S R G C L B

MELF S L

CHIP S L

SOT S C L

SOJC6 S C

SOJC14 R C

LCC R C L

PLCC R C L

QFP R C L

TAB R C

BGA, Flip-Chip S G B

Bare Dies S

Tab. 5.6.1 Optimum sequences of measurement methods

SIPLACE 80S-20/F4/F4-6/F5 User’s Manual 5 Vision Functions

Edition 03/98 from Software Version SR.404.xx 5.6 Test Component

Line engineer 5 - 111

5.6.4.16 ‘Size’ measuring mode

Click on the ‘Setting’ field for the ‘Size’ measuring mode to overlay the Size measuring mode menu on the

screen.

Fig. 5.6.26 Measuring mode option, Size measuring mode menu

This menu is used to

– vary the resolution the angle calculation.

– specify the method for the rotation calculation and

– vary the integration settings.

Resolution for the angle calculation

In this measuring mode, if the component rotation has been calculated incorrectly on account of ambiguity,

you can increase the angular resolution in order to determine the angle of rotation. The following increments

may be used in relation to the resolution in order to determine the angle of the components:

– Low resolution: