A10011-ASM-T45-EN-Spec-E_DMS - 第32页

32 Vision Sensor Technology Reading the Barcode and Data Matrix Code with a PCB Camera Description The PCB camera can read either a bar code or a data matrix code. The data can be used for traceability pur- poses. The ba…

Vision Sensor Technology

PCB Position Recognition

Bad Board Recognition

Ink spot criteria

Methods • Synthetic fiducial recognition method

• Mean gray scale value

• Histogram method

• Template matching

Shapes and sizes of fiducials/structures for

synthetic fiducials

other methods

For dimensions of synthetic fiducials, see page

min. 0.3 mm

max. 5 mm

Masking material Good coverage

Recognition time Depends on the method: 20 ms - 200ms

Description

In the cluster technology

each subpanel is assigned

an inkspot. If this is present

during the measurement via

the PCB vision module, the

corresponding subpanel is

populated. This function

helps prevent unnecessary

costs caused by placement

of defective panels.

Technical data for PCB position detection

PCB fiducials

Local fiducials

Library of bad panel recognition

Up to 3 (subpanels and multiple panels)

Up to 6 for the long board option (optional PCB fiducials

are output by the optimization.)

Up to 2 per PCB (may be of different type)

Up to 255 fiducial types per subpanel

Image analysis Edge detection method (singular feature) based on gray

scale values

Illumination type Front lighting

Fiducial recognition time 0.1 s

Field of vision 5.78 mm x 5.78 mm

Vision Sensor Technology

Reading the Barcode and Data Matrix Code with a

PCB Camera

Description

The PCB camera can read

either a barcode or a data

matrix code. The data can be

used for traceability pur-

poses.

The barcode can be on the

board itself or on a compo-

nent. In addition, it is also

possible to attach a barcode

label to a board or a compo-

nent and to then read this

barcode label with the PCB

camera, directly after place-

ment. The focal height must

be taken into account during

reading, if there is a barcode

or barcode label on the top of

a component.

Data Matrix Codes

Code types supported Only Data Matrix ECC 200 is supported.

No. rows/columns All combinations of rows/columns as defined in the standard will be

accepted, including rectangular symbols and large symbols with multi-

ple data areas.

Minimum dot size 50 µ

Maximum size of data matrix

codes

≤ 30 mm and Y ≤ 30 mm, or

≤ 10 mm and Y ≤ 100 mm, or

X ≤ 100 mm and Y ≤ 10 mm

Symbol angle All symbol angles will be accepted.

Inverse symbols Inverse symbols (light modules on a dark background) will be

accepted.

Mirrored symbols Mirrored symbols will be accepted.

(Station software version 707.1 SP2 or higher required)

Ratio of column width to row

height

1/2

≤ (column width) / (row height) ≤ 2

Region of Interest (ROI) The area in which the barcode is searched for (ROI) should not

exceed the following values:

Width of ROI

≤ 6 * width of barcode symbol

Height of ROI

≤ 6 * Height of barcode symbol

Contrast Minimum 20 gray values.

Print growth The size of a module must be at least 1/3 of the cell size in the data

matrix grid.

The size of a module must be at most 5/3 of the cell size in the data

matrix grid.

Vision Sensor Technology

Reading the barcode and data matrix code with a

PCB camera

1D Barcodes

Code types Code 39

Code 93

Code 128

EAN-8 (AddOn 2, AddOn 5), EAN-13 (AddOn 2, AddOn 5)

Interleaved 2 of 5 (station software version 709.1 or higher required)

Minimum width of bar 50 µ

If the quality of the marking is high enough, the width can be reduced

down to 30 µ.

Maximum size of barcode X

≤ 30 mm and Y ≤ 30 mm, or

X ≤ 10 mm and Y ≤ 100 mm, or

≤ 100 mm and Y ≤ 10 mm

Minimum height of symbol 5% of length of whole symbol.

Symbol angle All symbol angles will be accepted.

Inverse symbols Light bars on a dark background will be accepted.

(Station software version 708.0 or higher required)

Mirrored symbols Mirrored symbols will be accepted.

(this corresponds to a rotation of 180 degrees for 1D codes)

Region of Interest (ROI) The area on the board, in which the barcode is searched for (ROI),

should not exceed the following values:

ROI (direction of reading)

≤ 3 * symbol width

ROI (vertical to direction of reading) ≤ 10 * symbol width

Uniformity of bars and spaces Each bar and space represents 1 to 4 bits (applies to all code types

implemented), whereby the number of bits corresponds to the width of

the bar/space. When the barcode is read with the PCB camera, it is

assumed that the code is flat. This is why the same nominal width is

applied to all bars and spaces in the symbol when reading 1D bar-

codes with the PCB camera. As a consequence, barcodes cannot be

read if a bar/space with n bits appears to be smaller than another bar/

space with n-1 bits.