Two-dimensional code mark detecting method and apparatus therefo

Details Two-dimensional code mark detecting method and apparatus therefo Two-dimensional code mark detecting method and apparatus therefo

1996-08-08

1998-05-05

Le, Que

Radiant energy

Photocells; circuits and apparatus

With circuit for evaluating a web, strand, strip, or sheet

250566, 235494, G01N 2186

Patent

active

057478236

ABSTRACT:
A method of and an apparatus for detecting information from a code marking formed on a carrier by illuminating the code marking with illuminating light and detecting an emission from an illuminated position on which the illuminating light is projected. The code marking is a two-dimensional code marking bearing the information in first and second directions perpendicular to each other, and an illuminated area at the illuminated position is of a fine ribbon-like shape having a length greater than a maximum possible width of the code marking in the first direction and smaller than a minimum possible information width in the second direction. Illumination of the code marking is carried out by moving in a direction parallel to the second direction while traversing in the first direction.

REFERENCES:
patent: 3790756 (1974-02-01), Graves et al.
patent: 5430284 (1995-07-01), Numazaki
patent: 5506394 (1996-04-01), Plesko

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