Reading techniques
Leuze electronic
BCL 608i
21
Areas of application of the line scanner with oscillating mirror
For line scanners with oscillating mirror, oscillation frequency, start/stop position etc. are adjustable. It is
used:
• when the position of the label is not fixed, e.g. on pallets – various labels can, thus, be detected at
various positions.
• when the bars of the bar code are printed perpendicular to the conveying direction (“picket fence
arrangement”).
• when reading stationary objects.
• when the bar code is turned out of the horizontal position.
• when the reading distance is large.
• when a large reading field (reading window) has to be covered.
Figure 5.2: Deflection principle for the line scanner with oscillating mirror add-on
5.3
Omnidirectional reading
In order to read arbitrarily oriented bar codes on an object, at least 2 bar code readers are necessary. If
the bar code is not printed over-square, i.e. bar length > code length, bar code readers with integrated code
reconstruction technology are necessary.
Figure 5.3: Principle arrangement for omnidirectional reading
