Bar code reader system for reading bar code labels with a highly

Details Bar code reader system for reading bar code labels with a highly Bar code reader system for reading bar code labels with a highly

1989-12-13

1993-01-05

LaRoche, Eugene R.

Registers

Coded record sensors

Particular sensor structure

235470, 250225, 250568, G06K 710, G02F 101, H01J 4014

Patent

active

051773465

ABSTRACT:
A bar code reader system for reading bar code labels with highly specular spaces and bars with low contrast. The bar code label is illuminated with radiation polarized in a first direction. The radiation polarized in a first direction reflected from the bar code label is received and blocked by means of cross polarization. This blocked radiation is representative of the spaces and other radiation passing through unblocked is representative of the bars. The resulting radiation pattern representative of the bars and spaces is consequently inverted from its initial state into a secondary state. The radiation image passed by the block is detected in order to generate a signal representative of the bars and spaces. The strength of the signal representing the spaces is substantially diminished in intensity. The widths of the areas representing the bars and spaces is determined, and the widths representing the bars and spaces are interpreted to obtain the information of the bar code.

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patent: 4729122 (1988-03-01), Itoh
patent: 4740675 (1988-04-01), Brosnan et al.

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