Operating Instructions
Chapter
4
CLV65x Bar Code Scanner
Product description
8011980/0000/2009-04-21
©
SICK AG · Division Auto Ident · Germany · All rights reserved
31
4.6.3
Autofocus function
The autofocus function enables the CLV65x to detect the distance of an object without the
need for external sensors and adjusts the focus position automatically. In order to do so,
the CLV65x measures the object distance in its reading field in front of the reading window
and internally creates a distance profile.
The autofocus function operates in "Differential background" mode. The distance profile of
the reading field background is programmed (teach-in) in the CLV65x without any objects
present. The CLV65x focuses on the object which it recognizes by comparing the object with
the background. Application: with unobstructed view of the object restricted by other ob-
jects that protrude constantly into the reading plane. Only one object with barcode(s) is in-
side the reading field during one reading pulse.
The distance profile of the background can also be displayed in the SOPAS-ET configuration
software. The autofocus range is defined by the aperture angle, the autofocus space, and
(in the case of line scanners with oscillating mirror) also by the angle of deflection. The park
setting of the focus position, from which the device focuses for each read, can be specified
to the CLV65x in addition to a time and/or position-related delay (timeout or hysteresis). If
necessary, an offset can be defined for the focus position to be set by the measurement.
The depth of field, which radiates in the direction of the scan lines caused by the V-principle
of the beam deflection, is optimized as a result.
Fig. 4-4:
Optimization of the depth of field for the object
Note
The autofocus function can be configured using the SOPAS-ET configuration software:
P
ROJECT
TREE
, CLV65
X
, P
ARAMETER
, R
EADING
CONFIGURATION
, F
OCUS
CONTROL
, O
PTIONS
register
tab, A
UTOFOCUS
parameter
