Hand-held instant bar code reader system with automated focus ba

Details Hand-held instant bar code reader system with automated focus ba Hand-held instant bar code reader system with automated focus ba

1986-08-08

1989-10-31

Faber, Alan

Registers

Coded record sensors

Particular sensor structure

235472, 235454, G06K 710

Patent

active

048779490

ABSTRACT:
In the instant reading of bar codes by flash illumination, the disclosed system automatically adapts to bar code configurations of greater extent and/or curvature, for example by measuring distance to one or more points on the bar code and adjusting a lens barrel, and/or by selecting from multiple image paths through a lens system. Plural illumination sources may be used to enhance the uniformity of the reflected bar code image, may be flashed jointly and/or in rapid sequence, and may have flash durations individually adapted to respective segments of a bar code for optimum sensitivity and signal to noise ratio. One or a plurality of reflected light sensors may control integration time of a bar code image sensor, for example during sequential activation of plural illumination sources. Marker light beams may originate in the vicinity of the bar code image sensor and be projected through the optics to produce light spots on the bar code label precisely delineating the image sensor field of view.

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