5.3.2
Reading distance to the bar code and aperture angle α
The maximum distance from the reading window of the device to the bar code may not
exceed the design values for the device. Because of the V-shaped deflection of the
beams, the usable length of the scan line for evaluation (reading field height) depends
on the reading distance.
In the specification diagrams, the height of the reading field dependent on the reading
distance is shown for differing resolutions (module widths),
5.3.3
Angle alignment of the device
The optimum alignment of the device is achieved when the scan line crosses the
stripes of the bar code as close to a right angle as possible (tilt and inclination). Possi‐
ble reading angles that can arise between scan line and bar code at all three levels in
the area must be taken into account.
β
α
γ
1
2
Figure 5: Line scanner: Read angle occurring between scanning line and bar code
1
Depth of field
2
Reading distance
NOTE
The specified maximum values can only be achieved if conditions are optimal. The
actual maximum depends on the module width, code type, print contrast, ambient light,
distance and scanning frequency.
Table 6: Permitted read angle between scanning line and bar code
Angle
Limit value
Tilt α
±5° (with code resolution
≥
0.125 mm)
±10° (with code resolution
≥
0.15 mm)
±15° (with code resolution
≥
0.2 mm)
±25° (with code resolution
≥
0.35 mm)
Pitch β
±6° (with code resolution
≥
0.2 mm)
±15° (with code resolution
≥
0.5 mm)
Skew γ
±20° (with code resolution
≥
0.2 mm)
±30° (with code resolution
≥
0.5 mm)
5.3.4
Avoidance of surface reflections
If the light of the scan line(s) hits the surface of the bar code precisely vertically, this
may cause interference when the light reflected back is received. To prevent this effect,
the device must be mounted so that the light emitted is tilted relative to the vertical.
MOUNTING
5
8021817/10Y9/2018-09-14 | SICK
O P E R A T I N G I N S T R U C T I O N S | CLV60x
17
Subject to change without notice