Specification SIPLACE CA-Series2011版 - 第42页

42 Vision Sensor Technology Bad Board Recognition Position Recognition of Feeder Modules Ink Spot Criteria Methods • Synthetic fiducial recognition method • Mean grayscale value • Histogram method • Template matching Sha…

Vision Sensor Technology

PCB Position Recognition

Description

Different fiducial shapes

prove to be optimal depend-

ing on the condition of the

surface. Particularly advis-

able for bare copper surfaces

with little oxidation is the sin-

gle cross. Maximum accura-

cy is achieved due to the high

information content.

Rectangle, square and circle

are less "informative" but

save space and can even be

used when oxidation is at an

advanced stage.

Advisable for tinned struc-

tures are circle or square be-

cause in this case the ratio of

the fiducial dimensions to the

presolder thickness is partic-

ularly favorable.

Fiducial criteria

Locate 2 fiducials

Locate 3 fiducials

X-/Y-position, rotation angle, mean PCB distortion

Additional: shearing, distortion separately in X and Y direc-

tion

Fiducial shapes Synthetic fiducials: circle, cross, square, rectangle, diamond,

circular, square and rectangular contours, double cross

pattern: any

Fiducial surface:

copper

tin

Without oxidation and solder resist

Warpage  1/10 of structure width, good contrast to sur-

rounding area in each case

Dimensions of synthetical fiducials (standard)

Min. X/Y size for circle and rectangle: 0.25 mm

Min. X/Y size for annulus and rectangle: 0.3 mm

Min. X/Y size for cross: 0.3 mm

Min. X/Y size for double-cross: 0.5 mm

Min. X/Y size for rhombus: 0.35 mm

Min. frame width for annulus and rectangle: 0.1 mm

Min. bar width / bar distance for cross, double-cross: 0.1 mm

Max. X/Y size for all fiducial shapes: 3 mm

Max. bar width for cross, double-cross: 1.5 mm

Min. tolerances, general: 2% of nominal dimension

Max. tolerances, general: 20% of nominal dimension

Dimensions of patterns

min. size

max. size

0.5 mm

3 mm

Fiducial environment Clearance around reference fiducial not necessary if there is

no similar fiducial structure in the search area

Vision Sensor Technology

Bad Board Recognition

Position Recognition of Feeder Modules

Ink Spot Criteria

Methods • Synthetic fiducial recognition

method

• Mean grayscale value

• Histogram method

• Template matching

Shapes and sizes of fidu-

cials/structures for

synthetic fiducials

other methods

For dimensions of synthetic fidu-

cials, see page 41

min. 0.3 mm

max. 5 mm

Masking material good coverage

Recognition time depends on the method: 20 ms -

0.2s

Description

In the cluster technology

each subpanel is assigned

an ink spot. If this is present

during the measurement via

the PCB vision module, the

corresponding subpanel is

populated.

It is also possible to accom-

plish the population of the

subpanel when the ink spot

is missing. With this function

it is possible to eliminate

costs due to unnecessary

population of faulty subpan-

els.

Inkspot files can be imported

with the optional software

module "iSkip".

Global Ink Spot

Each GOOD/SCRAP scan

takes some time, and the

time required is even greater

if there are a large number of

panels on a PCB. The global

inkspot helps to significantly

reduce these secondary pro-

cessing times.

The PCB vision module

searches at positions taught

before for the defined fidu-

cial. In case of recognition

there is no following evalua-

tion of subpanels. The sys-

tem allows the operator to

also choose the reverse in-

terpretation.

Position recognition of

feeder modules

Position recognition helps to

precisely pinpoint the exact

pickup position of the compo-

nents. The offset in position

relative to the stored ideal

position is determined on the

basis of fiducials on the feed-

er modules using the PCB vi-

sion module. With 0201

components, the position de-

viation is determined by the

component pocket detection.

This ensures a very high

pickup reliability from the

very first component.

Technical data

Siemens Signal Interface - Connector Assignment

Signal interface (14-pole connecting socket, interface standard 1.2)

Upstream station X1 Downstream station X2

Pin 1 NOT READY + Pin 1 NOT READY +

Pin 2 NOT READY – Pin 2 NOT READY –

Pin 3 BOARD AVAILABLE + Pin 3 BOARD AVAILABLE +

Pin 4 BOARD AVAILABLE – Pin 4 BOARD AVAILABLE –

Pin 5 Not used Pin 5 Not used

Pin 6 Not used Pin 6 Not used

Pin 7 Not used Pin 7 Not used

Pin 8 Reserved Pin 8 Reserved

Pin 9 Reserved Pin 9 Reserved

Pin 10 Reserved Pin 10 Reserved

Pin 11 Reserved Pin 11 Reserved

Pin 12 Reserved Pin 12 Reserved

Pin 13 Reserved Pin 13 Reserved

Pin 14 Reserved Pin 14 Reserved