Installation and mounting
Leuze electronic
BCL 338
i
69
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 6.7)!
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 6.7:
Total reflection – line scanner
6.3.3
Avoiding total reflection – deflecting mirror scanner
For the BCL 338
i
with
deflecting mirror
, the laser beam exits at an angle of 105° to the rear
housing wall.
An angle of incidence of 15° of the laser to the label has already been integrated in the
deflecting mirror so that the BCL 338
i
can be installed parallel to the bar code (rear housing
wall).
Figure 6.8:
Total reflection – line scanner
Zero
pos
ition
Dist
ance
acc
. to
read
ing f
ield
curv
es
Bar code
The BCL 338
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°
Dist
ance
acc
. to
read
ing f
ield
curv
es
Bar code
The BCL 338
i
with deflecting mirror should be mounted
parallel to the bar code.
15°
Zero position