Omron V530-R150E-2 Operation Manual page 230

Glossary
Marking Methods
There are several marking methods that can be used. The most suitable method will
depend on factors such as the material of the object onto which the code is marked.
The most commonly used marking devices are listed below.
Printer
A printer can be used to print codes onto paper and different kinds of labels.
Laser Marker
A laser marker can be used to mark metal objects. A laser marker can mark very
finely enabling the size of 2-dimensional codes can be reduced.
Exposure Marking
Using exposure marking, particles are not created (unlike laser marking) and
even finer marking is possible than with laser marking. Exposure marking is used
with semiconductor wafers, LCD panels, and color filters that have exposure pro-
cessing.
Margin
This is the empty space around 2-dimensional codes. Usually it is necessary to
ensure that there is a margin around 2-dimensional codes.
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The black area is the margin.
Appendix D