Multiple depth of field laser optical scanner

Details Multiple depth of field laser optical scanner Multiple depth of field laser optical scanner

1993-12-15

1996-01-16

Shepperd, John

Registers

Coded record sensors

Particular sensor structure

235472, G06K 710

Patent

active

054849900

ABSTRACT:
A multiple depth of field optical scanner which produces a plurality of scan beams having different focal distances. The optical scanner includes a laser beam having a centerline, a mirrored spinner having a plurality of facets with different curvatures, a detector, and a microcontroller. The optical scanner may additionally include a deflector mirror for changing the direction of the laser beam, collecting optics for equalizing the optical coupling of the reflected light across the field of view of the facets, a distance selection circuit for instructing the microcontroller within the scanner to decode bar code information from a predetermined range of focal distances and an amplification circuit for amplifying the electrical signals from the detector enough to produce other electrical signals having substantially equal amplitudes. The microcontroller may also include the feature of reducing laser power when the scan beams focus more than a predetermined distance from the centerline of the laser beam.

REFERENCES:
patent: 4560862 (1985-12-01), Eastman et al.
patent: 4591242 (1986-05-01), Boockman et al.
patent: 4748316 (1988-05-01), Dickson
patent: 4820911 (1989-04-01), Arackellian et al.
patent: 4841129 (1989-06-01), Tawara et al.
patent: 5179271 (1993-01-01), Lindacher et al.

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