Method and apparatus for the reading of a bar code

Details Method and apparatus for the reading of a bar code Method and apparatus for the reading of a bar code

1998-04-21

2000-11-14

Le, Thien M.

Registers

Coded record sensors

Particular sensor structure

23546225, C06K 710

Patent

active

061457450

ABSTRACT:
A method is described for the reading of a bar code consisting of a predetermined number of code elements for the production of a binary signal with sequential high and low phases the length of which correspond to the width of the sequential code elements. In the method the code elements are scanned by the scanning beam or by a plurality of scanning beams of a bar code reader along scanning lines extending substantial parallel to one another. During this the sweeping of the scanning beam over the bar code defines a scan and a scanning plane is defined by each scanning beam when sweeping over the bar code. The angle of tilt between the respective scanning plane and A predetermined reference plane is determined for essentially each scan. During the decoding of the bar code the angles of tilt thus found are evaluated to compensate for grid errors, i.e. for irregular spacings between adjacent scanning lines. Furthermore, a method for the compensation of fluctuations in the scanning speed and also an apparatus for carrying out the method are described.

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