NOTE
The SOPAS-ET configuration software can be used to configure the trigger source:
The auto focus function allows the device to conduct the distance detection for the
object without help from external sensors and to set the focus position independently.
In order to do this, the device measures the distance from the object in its field of
vision, uses this to create a distance profile internally and positions the focus on the
object.
The auto focus function works in the “Difference to background” mode. The device is
taught the distance profile of the background of its vision area without an object. Then
the device focuses on the object, which it detects by establishing the difference from
the background. The application is carried out e.g. with free vision of the object with
restriction from structures which permanently protrude into the read level. Only one
object with bar code(s) is in the reading field for each read cycle.
The distance profile of the background that is created can be displayed in the SOPAS ET
configuration software. The definition of the auto focus area is carried out by selecting
the aperture angle, the auto focus area and for line scanners with oscillating mirror also
by limiting the oscillation amplitude (the angle of deflection). It is possible to specify,
among other things, the park position (preferred position) of the focus position, from
which refocusing is carried out for each reading, for the device and a temporal and/or
spatial delay time (timeout/hysteresis).
The focus position to be set via measurement can also have an additional offset
applied if necessary. This means that the depth of field, which runs radially in the direc‐
tion of the scan line and is caused by the V-principle of light beam deflection, can be
optimized for the object.
1
2
3
Re
ad
y
Rea
d D
iag
n
Re
ss
ult
T ea
ch-
in
La
se
r
Aut
o-S
etu
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Da
ta
Adj
ust
in
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CA
N
Use
r d
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LIN
K T
X
[%
]
10
0
Figure 6: Auto-focus
1
Measured distance
2
Optimized focus position: measured distance plus offset for maximum
3
Depth of field (DOF)
NOTE
The auto focus function can be configured with the SOPAS-ET configuration software:
project tree, CLV6xx, parameters, read configuration, focus control, options tab, auto
focus parameters
3
PRODUCT DESCRIPTION
16
O P E R A T I N G I N S T R U C T I O N S | CLV69x
8014396/ZMG8/2017-07-04 | SICK
Subject to change without notice
