SICK CLV 420, Руководство по эксплуатации

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Chapter 4 Operating Instructions
CLV 42x bar code scanner
4-4
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SICK AG · Division Auto Ident · Germany · All rights reserved 8 009 981/O078/16-08-2004
Installation
4.2.7 Distance between the CLV and the bar code
Basic alignment of the scan line to the bar code
Depending on the application, the line scanner or raster scanner version of the CLV is used.
Fig. 4-4 shows how the device is aligned with the bar code on the object for each of the two
scanning methods.
Reading distance between bar code and aperture angle
α
The distance between the reading window of the CLV and the bar code must not exceed
the technical limits. The height of the reading field is shown as a function of the reading
distance “a“ for various resolutions (module widths) in Chapter 10.2 Specification diagrams,
Page 10-1 .
Fig. 4-5 shows the definition of the reading distance a from the reading window and of the
aperture angle
α
for each of the two scanning methods.
The useable aperture angle
α
is max. 50
°
for both scanning methods, even with the
additional 105
°
angle attachment. Due to the V-principle of beam deflection, the reading
field height (for evaluating the useful length of the scan line) depends on the reading
distance.
Fig. 4-4: Scanning methods: alignment with bar code and conveyor direction
Raster scanner Line scanner
Fig. 4-5: Definition of the reading distance a and the aperture angle
α
Line scanner Raster scanner
Reading distance a
Reading distance a