PRINTED MATTER AND PEN TYPE READING VOCAL APPARATUS

摘要

PROBLEM TO BE SOLVED: To prevent a printing other than a code pattern from being visually affected by printing the code pattern composed of a plurality of dots so as not to be viewed as much as possible.

SOLUTION: The first printing element of the code pattern is 0.06-0.2 mm in the diameter or the length of one side of the dot. The total area of the dots contained in a unit code pattern relative to the area occupied by the unit code pattern is in the range of 5-33% ratio. The first printing element is printed using an ink which contains 0.7-2.0 wt.% of carbon black.

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