Linearization of raster patterns in 2D optical scanners

Details Linearization of raster patterns in 2D optical scanners Linearization of raster patterns in 2D optical scanners

1997-01-27

1999-03-30

Lee, Michael G.

Registers

Coded record sensors

Particular sensor structure

235454, 235470, G06K 710

Patent

active

058892699

ABSTRACT:
An optical scanner for reading two-dimensional indicia such as bar code symbols and the like includes a scan element arranged to create a two-dimensional raster pattern which may be scanned across the indicia to be read. In order to improve linearity of response in the vertical direction, perpendicular to the direction of the scan lines, the scan element is driven in that direction by a modified triangle waveform in which the amplitude and/or the phase of at least one of the harmonics has been altered. A scanning synchronization signal is provided by a long thin photodetector which is swept by the scanning beam at the left hand end of each scan path. This enables reading of vertically-modulated bar code symbologies such as POSTNET and PostBar.

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