Optical scanner for reading bar codes detected within a large de

Details Optical scanner for reading bar codes detected within a large de Optical scanner for reading bar codes detected within a large de

1986-06-13

1988-05-31

Pitts, Harold I.

Registers

Coded record sensors

Particular sensor structure

235457, G06K 710, G06K 714

Patent

active

047483164

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.

REFERENCES:
patent: 3522437 (1970-08-01), Bargh
patent: 3534332 (1970-10-01), Parks
patent: 3673566 (1972-06-01), Reede
patent: 4160237 (1979-07-01), McMahon
patent: 4224509 (1980-09-01), Cheng

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