MLT-DPM Illuminator
Product Reference Guide 195
MLT-DPM Illuminator
This is both a Bright Field and a Dark Field illuminator available for 1.3 MP
models.
Figure 95 - 39/24-LED MLT-DPM Illuminator
The MLT-DPM illuminator is made up of 63 LEDs divided into two groups of four
sectors each, independently controlled by the software application.
Four sectors of six LEDs each make up the internal group called
Central LED
Group
and correspond to Bright Field illumination. The operating distance range
is typically from 20 to 250 mm. The reader focus distance further limits this
range.
The use of the MLT-DPM
Central LED Group
is particularly effective in direct part
mark applications (DPM), where linear machining flaws are present on the part
surfaces. In these cases, an image of the code can be obtained having a very
light background.
The other four sectors make up the external group called
Peripheral LED Group
and correspond to Dark Field illumination. Dark Field illumination is guaranteed
by the 39 side-emitting blue LEDs divided as follows: a TOP sector of 7 LEDs, a
BOTTOM sector of 8 LEDs and two sectors (LEFT and RIGHT) of 12 LEDs each.
The
Peripheral LED Group
can be the correct solution for DPM applications with
highly reflective surfaces. In these applications, by using a traditional bright field
illuminator, the code can result unreadable because in the acquired image some
parts of the code are made invisible due to gray-level saturation generated by
direct reflection of the illuminator LEDs.
To obtain optimum Dark Field illumination, it is necessary to work at close
ra
nge, typically in the range from 20 to 50 mm. The reader focus distance
further limits this range.
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