Optical scanner for reading bar codes detected within a large depth of field
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United States of America Patent
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-
May 31, 1988
Grant Date -
N/A
app pub date -
Jun 13, 1986
filing date -
Jun 13, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
This disclosure describes a technique for reading bar codes scanned by focussed scan lines having different focal lengths where at least one of the scan lines has a beam that is small relative to irregularities of the surface on which the label appears. The scan lines are generated using a holographic disk so as to have a predetermined focal length and focal zone. The focal zone of each generated scan line overlaps the focal point of at least one adjacent scan line. Any bar code label which might be scanned by a beam so small that it would be degraded by surface scatter noise is also scanned by a slightly larger beam. The slightly larger beam 'averages out' the surface scattering noise to produce a smoother or cleaner return signal.
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