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US 6,533,182 B1Granted
Two-dimensional dot code and reader thereof
AssigneeOMRON Corporation
InventorsManabu Ohshima, Tomohiro Inoue, Hideki Chujo
Life of this patent
Estimating the term…
Abstract
Timing marks are printed at the left and right of a data mark of a two-dimensional dot code. Whether or not the data mark exists is determined based on the position on the line connecting the centers of the timing marks at both ends at the left and right of the data mark.
Claims10
A two-dimensional dot code comprising:
- a plurality of dots placed in two dimensions of a data field for representing a predetermined code, said two dimensions being made up of a plurality of rows of said dots;
- and
- a plurality of timing marks for indicating positions of the dots within said data field, said timing marks being located at at least one end of predetermined ones of said plurality of rows of said dots, each of said plurality of rows of said dots running in a direction perpendicular to a read direction of the dots for representing the code, a line running through a center of each of said plurality of timing marks representing a center of a corresponding row of said data field such that a center of a dot located on said corresponding row in said data field is located either on said line or within a predetermined search range relative to said line.
A reader for reading a two-dimensional dot code comprising dots placed in two dimensions of a data field for representing a predetermined code, said data field being made up of a plurality of rows of said dots, said reader comprising:
- first detection means for detecting positions of respective pairs of timing marks placed at both ends of each of said plurality of rows of said dots, a line running through a center of each pair of tiring marks representing a center of a corresponding row of said data field;
- and
- second detection means for detecting the dots representing the code between the timing marks such that a center of a dot located on said corresponding row in said data field is located either on said line or within a predetermined search range relative to said line.
Dependencies are inferred from the claim text.