Chapter
5
Operating Instructions
CLV640 Bar Code Scanner
44
©
SICK AG · Division Auto Ident · Germany · All rights reserved
8011975/0000/2008-04-14
Installation
5.3.1
Allocation of the scanning line for the bar code
The main allocation of the scanning line to the bar code on the object depends on the ver-
sion of the bar code scanner (
line scanner
,
raster scanner
or
line scanner with oscillating
mirror
).
Fig. 5-3:
Allocation of the scanning line(s) for the bar code and conveyor system
5.3.2
Reading distance to the bar code and aperture angle
α
The maximum distance between the bar code scanner's reading window and the bar code
must not exceed the device-specific thresholds.
The usable length of the scanning line that is used for the evaluation (reading area height)
depends on the reading distance because of the V-shaped deflection of the beam.
Fig. 5-4:
Definition of the reading distance a and the aperture angle
α
In the specification diagrams (
chapter 10.3 Specification diagrams, page 84
) the depth of
field is shown depending on the adjustable focus position and the aperture angles used for
various resolutions (modul widths).
