Improved bar code reader system for reading bar codes under high

Details Improved bar code reader system for reading bar codes under high Improved bar code reader system for reading bar codes under high

1990-07-16

1992-09-22

Shepperd, John W.

Registers

Coded record sensors

Particular sensor structure

235455, G06K 710

Patent

active

051499487

ABSTRACT:
An improved bar code reading system for reading bar codes having a wide range of intensity of reflected radiation includes repeatedly scanning a beam of radiation across a bar code containing bar and space code elements; monitoring the number of scans of the beam across the bar code; sensing the radiation reflected from the bar code and providing a bar code signal representative thereof; the bar code signals are amplified at one of a number of different gains, and a different gain is selected for each scan. Also disclosed is an improved bar code reader system for reading bar codes of diffuse bar elements and specular spaced elements. A bar code is illuminated with radiation polarized in a first direction at an acute angle to the surface of the bar code and generally parallel to the bars and spaces for diverting radiation reflected from the specular spaces away from the scanner and for directing a portion of the radiation reflected from specular imperfections in the bars to the receiver; a crossed-polarizer blocks substantially all the radiation directed back to the scanner from the specular spaces and the specular imperfections in the bar, and transmits to the scanner substantially all the diffuse radiation from the bars and a portion of the return of the specular imperfections of the bars.

REFERENCES:
patent: 3801182 (1974-04-01), Jones
patent: 3812374 (1974-05-01), Tuhro
patent: 4211918 (1980-07-01), Nyfeler
patent: 4469442 (1984-09-01), Reich
patent: 4631713 (1986-12-01), Romeas et al.
patent: 4682015 (1987-07-01), Quan
patent: 4794238 (1988-12-01), Hampton
patent: 4820911 (1989-04-01), Arackellian et al.
patent: 4894817 (1990-01-01), Tanaka et al.

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