Multiple focus optical system for data reading applications

Details Multiple focus optical system for data reading applications Multiple focus optical system for data reading applications

1995-06-07

1996-10-15

Shepperd, John

Registers

Coded record sensors

Particular sensor structure

359204, G06K 710

Patent

active

055656684

ABSTRACT:
An optical system and method for data reading having a light source which generates an optical beam directed toward an object to be read and a focusing system in the outgoing light path which establishes multiple beam functions. In a preferred application, a scanning system includes a multifocal lens having a single lens element having an inner lens portion of a first focal length and an outer annular lens portion with a second focal length, the optical system of a bar code scanner therefore establishing two separate focal positions from a single light source. Alternately, the system includes a focusing lens system with an corrector element disposed in the outgoing optical path, the corrector element having a plurality of optical zones, each zone having a different optical characteristic for modifying a portion of the outgoing optical beam. A zone may be a refractive region, a reflective region, a diffractive region, an empty region, a window region, or combinations thereof. In one embodiment, the system has two optical elements, namely a glass main focusing lens and a plastic corrector plate.

REFERENCES:
patent: 4808804 (1989-02-01), Krichever et al.
patent: 5073702 (1991-12-01), Schuhmacher
patent: 5200597 (1993-04-01), Eastman et al.
patent: 5386105 (1995-01-01), Quinn et al.

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