Operating Instructions
Chapter
4
CLV 45x Bar Code Scanner
Installation
8 009 139/K949/06-06-2002
©
SICK AG · Division Auto Ident · Germany · All rights reserved
4-5
The effective aperture angle
α
amounts for the CLV 450 to a
max. of 50
°
, for the CLV 451
to a
max. of 55
°
at both scanning processes. Due to the V principle of the beam deflection
the reading field height (for evaluating the usable length of the scan line) depends on the
reading distance.
Angle position of the CLV
The optimum position of the CLV is reached when the scan line passes over the bar code
right-angled (90
°
) (
). Possible reading angles which can occur between the scan line
and the bar code have to be taken into consideration (
and
Fig. 4-6:
Definition of the reading distance a and of the aperture angle
α
a
a
Line scanner
Line scanner with
oscillating mirror
Reading distance
Reading di-
a
a
Reading distance a
Reading distance a
Fig. 4-7:
Line scanner: Reading angle occurring between the scan line and the bar code
b
a
g
α:
Azimuth angle (tilt)
β:
Angle of inclination (pitch)
γ:
Angle of rotation (skew)
Reading
range
Reading
distance
Angle
Limit
Azimuth
α
(tilt)
Max.
±
45
°
(in scan axis and at focal position 200 ... 900 mm for a modul
width of 0.35 ... 1.0 mm)
Inclination
β
(pitch)
Max.
±
45
°
(depending on module width and focal position)
Rotation
γ
(skew)
Max.
±
45
°
(depending on module width and focal position)
Table 4-1: Permitted reading angle between the scan line and the bar code
