Multifocal holographic scanning system

Details Multifocal holographic scanning system Multifocal holographic scanning system

G - Physics

06

K

88/0.14

G06K 7/10 (2006.01) G02B 26/10 (2006.01)

Patent

CA 1156862

MULTIFOCAL HOLOGRAPHIC SCANNING APPARATUS AND SYSTEM Abstract of the Disclosure A holographic scanning system for scanning bar code indicia is disclosed in which the light beam of a laser is directed to a first set of holograms located on a single rotating disc in which each hologram will generate an individual scan beam having a slightly different focal length and direction angle from that of the other holograms. The generated scanning beams are directed on a target area through which passes a label or object bearing a bar code indicia. Each of the scan beams is projected in an overlapping relationship on the target area, thereby providing an enhanced depth of focus enabling a more effective reading operation. The light reflected from the bar code indicia is picked up by a second set of holograms mounted on the rotating disc and focused at a point at which is located an optical detector for use in reading the bar code.

391871

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