Hand-held barcode label reader with increased depth of field

Details Hand-held barcode label reader with increased depth of field Hand-held barcode label reader with increased depth of field

1993-12-29

1995-03-14

Hajec, Donald

Registers

Coded record sensors

Particular sensor structure

235472, G06K 710

Patent

active

053978854

ABSTRACT:
A barcode label reader comprises a read window having a longer dimension parallel to an X axis and a lens system with an optical axis Y substantially normal to the window at its center which projects a conjugate image of a read line of the label onto a CCD type strip which is scanned sequentially to form a signal representing the barcode carried by the label. A strip of light-emitting diodes is disposed outside the X-Y plane to illuminate the label through the read window. A prismlike lens in the form of two refractors separated by a slot in the X-Y plane deflects the beam emitted by this strip so that it is substantially parallel to the X-Y plane. Thus, the depth of field of the reader is limited only by the aperture of the lens system.

REFERENCES:
patent: 4742220 (1988-05-01), Beyor
patent: 4743773 (1988-05-01), Katana et al.
patent: 4866258 (1989-09-01), Ueda et al.
patent: 5166820 (1992-11-01), Fujita
patent: 5280161 (1994-01-01), Niwa

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