D3操作手册 - 第34页

34 Vision Sensor Technology Bad Board Recognition Position Recognition for Feeder Modules Ink Spot Crit eria Method s • Synt hetic fid ucial recogniti on method • Mean gr ayscal e val ue • Histogram m ethod • Templat e m…

Vision Sensor Technology

PCB Position Recognition

Description

Different fiducial shapes

prove to be optimal depend-

ing on the condition of the

surface.

Particularly advisable for bare

copper surfaces with little

oxidation is the single cross.

Maximum accuracy is

achieved due to the high in-

formation content. Rectan-

gle, 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

particularly favorable.

Fiducial criteria

Locate 2 fiducials

Locate 3 fiducials

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

in addition: shear, distortion in X- and Y-direction separately

Fiducial shapes Synthetic fiducials: circle, cross, square, rectangle, rhombus, circu-

lar, square, and rectangular contours, double cross, any pattern

Fiducial surface:

copper

tin

without oxidation and solder resist

Warp ≤ 1/10 of structure width, both with good contrast to envi-

ronment

Dimensions of synthetic fiducials

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 lozenge: 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 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 for Feeder Modules

Ink Spot Criteria

Methods • Synthetic fiducial recognition

method

• Mean grayscale value

• Histogram method

• Template matching

Shapes and sizes of fiducials/

structures for

synthetic fiducials

other methods

For dimensions of synthetic fidu-

cials, see page 33

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 dur-

ing the measurement via the

PCB vision module, the corre-

sponding subpanel is popu-

lated.

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 popula-

tion of faulty subpanels.

Global Ink Spot

Each GOOD/SCRAP scan takes

some time, and the time re-

quired is even greater if there

are a large number of sub-

panels on a PCB. Using the

global ink spot can result in a

significant reduction of these

secondary 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

choose also the reverse inter-

pretation.

Recognition of the position

of the feeder modules

The pick-up position of the

components can be deter-

mined precisely with the aid

of the position recognition

for the feeder. The offset in

position relative to the stored

ideal position is determined

on the basis of fiducials on

the feeder modules using the

PCB vision module. This pro-

vides very high pick-up reli-

ability even for the very first

component, which is particu-

larly important for small com-

ponents.

Sample Configuration

Services

As a service, SIEMENS A&D

EA can fully integrate the

SIPLACE D3 placement

machine into your produc-

tion line. With our extensive

expertise and by using the

right tools and equipment,

we can ensure that the instal-

lation process runs smoothly

and efficiently. However, this

will require you to clarify the

infrastructure aspects in ad-

vance and make any neces-

sary changes at your

production facility.

Safety instructions

Read the operating instruc-

tions before starting to set up

and commission the place-

ment machine. The applica-

ble accident prevention

regulations concerning the

transportation of heavy

goods must be followed.

Nozzle changer C&P12

Component

changeover table

with 15 locations

Nozzle Changer (TwinHead)

5-part conveyor belt

with automatic width adjustment

from 50 mm to 508 mm (2“ to 20“)

Nozzle Changer (TwinHead)

Component

changeover table

with 15 locations

Nozzle changer C&P12

Component changeover table

with 15 locations

C&P12