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4.4
Reading techniques
4.4.1
Line scanner (single line)
A line (scan line) scans the label. Due to the opt. opening angle, the reading field width is
dependent on the read distance. Through the movement of the object, the entire barcode is
automatically transported through the scan line.
The integrated code fragment technology permits twisting of the barcode (tilt angle) within
certain limits. These are dependent on the transport speed, the scanning rate of the scanner
and the barcode properties.
Areas of application of the line scanner
The line scanner is used:
• when the bars of the barcode are printed in the conveying direction ('ladder arrange-
ment').
• with barcodes having very short bar lengths.
• when the ladder code is turned out of the vertical position (tilt angle).
• when the scanning distance is large.
Figure 4.4:
Leuze electronic
Deflection principle for the line scanner
BCL 500
i
i
\ BCL 501
Device description
23
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