Bar code scanner with quasi-retroreflective light collection

Details Bar code scanner with quasi-retroreflective light collection Bar code scanner with quasi-retroreflective light collection

1994-06-30

1996-06-25

Hajec, Donald T.

Registers

Coded record sensors

Particular sensor structure

235454, 235462, G06K 710

Patent

active

055302335

ABSTRACT:
Optical scanning of bar code symbols in which light reflected from the scanned symbol is collected with stationary light collection optics and swept across an array of individual light detection elements (e.g., photodetectors). Detection circuitry determines which of the detection elements is receiving the incoming light beam at a given time, and produces an output signal based preferably only on the outputs of those detection elements. The selection of detection elements to be used in forming the output signal may be made by synchronizing the sampling of the detection elements with the scanning movement of the outgoing light beam. Alternatively, the selection may be based on the output level of the detection elements (e.g., by only using outputs that exceed a predetermined threshold).

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