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).
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