Chapter
3
Operating Instructions
CLV 45x Bar Code Scanner
3-6
©
SICK AG · Division Auto Ident · Germany · All rights reserved
8 009 139/K949/06-06-2002
Product description
3.2.1
Changeable focal position
The CLV 45x can change its focal position dynamically and thus cover a large reading range.
To this purpose a max. of 8 reading ranges can be defined internally as a distance configu-
ration and can be approached during reading mode by the optics in a random order
The changeover is carried out on the basis of the changing object distance (when reading
from above: object height detection). The trigger source for the changeover with a maximum
of 2 stages is a signal at the "Sensor 2" switching input. For the changeover with a maximum
of 8 stages a command at the host interface interface or the integrated timer (e. g. for
search runs). At the line scanner with oscillating mirror additionally the oscillating mirror in-
version points of the two-sided displacement. The distance configurations are assigned to
the changeover sequence by means of a programmable assignment table.
3.2.2
Variants of the scanning process
Line scanner
Generates one scan line. The reading area height (for evaluating the usable length of the
scan line) depends on the reading distance because of the V principle of the beam deflec-
tion.
Line scanner with oscillating mirror
The oscillating mirror additionally deflects the scan line vertically to the scanning direction to
both sides at a low oscillating frequency. This means that the CLV can also scan larger areas
or ranges for bar codes. The reading field height (for evaluating the usable length of the scan
line) depends on the reading distance because of the V principle of the beam deflection.
In addition to parking (fixed position) and the simple deflection with a maximum deflection
width, optimized function runs of the oscillating mirror are also possible:
•
Oscillation with variable deflection per distance configuration
•
One-Shot: Single defined deflection per reading pulse (forward and return).
Fig. 3-4:
Focal position changeover: Division of the overall reading range into distance
configurations
Reading
field
height
Focal
position
Reading
distance
DC 8
DC 7
DC 6
DC 5
DC 4
DC 3
DC2
DC 1
DC =
D
istance
c
onfiguration
Focal position
Reading
distance
