Leuze electronic
BCL 558
i
71
TNT
35/7-2
4
V
6.3.2
Avoiding total reflection – Line scanner
The bar code label must be positioned at an angle of inclination greater than ±10° … 15°
from vertical in order to avoid total reflection of the laser beam (see figure 6.6)!
Total reflection occurs whenever the laser light of the bar code reader is directly incident
on the surface of the bar code at an angle of 90°. The light directly reflected by the bar code
may overload the bar code reader and thereby cause non-readings!
Figure 6.6:
Total reflection – line scanner
6.3.3
Avoiding total reflection – oscillating/deflection-mirror scanner
For the BCL 558
i
with
oscillating/deflection mirror
, the laser beam exits at an angle of
90°
to vertical
.
For the BCL 558
i
with
deflection mirror
, it is also possible to
use software to adjust the
direction of the beam by ±10°
.
For the BCL 558
i
with
oscillating mirror
, the
swivel range of ±20°
(±12° for devices with
heating)
is to be taken into account
.
This means that in order to be on the safe side and to avoid total reflection, the BCL 558
i
with oscillating/deflection mirror must be inclined upward or downward 20° … 30°!
Notice!
Mount the BCL 558
i
with oscillating/deflection mirror in such a way that the outlet window
of the bar code reader is parallel to the object. This will result in an angle of inclination of
approx. 25°.
Notice!
Please note: the BCL 558
i
line scanner with deflection mirror (perpendicular beam exit) is
currently not available.
Zero
pos
ition
Dist
ance
acc
. to
read
ing f
ield
curv
es
Bar code
The BCL 558
i
should be mounted in such a way that the
scanning beam is incident on the bar code at an angle of
inclination greater than ±10° … 15° to vertical.
±10 … 1
5°
