Formation method of two-dimensional code
US6681055B1 · kind B1 · utility
Inventor
Key dates
| Filing date | Jan 24, 2000 |
| Grant date | Jan 20, 2004 |
| Priority date | — |
| Expiry date | Jan 24, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K19/06037
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A formation method of a two-dimensional code is characterized by including the steps of: storing each cell having a bright pattern or a dark pattern as 0 or 1 in a two-dimensional array after reading a bit map file; calculating a number of round dots contained in a cell from the size of one cell to be laser-marked and a processed diameter of a round dot formed by a laser beam according to material processed; obtaining a processed area from the two-dimensional array stored and the size of one cell; setting a plurality of cell frames in a checked pattern with this center point as a base; arranging the round dots in equal intervals in the cell frames; storing in memory the coordinates of beam spots corresponding to the respective round dots arranged; and outputting process data stored in this memory to a laser marker and performing laser-marking.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.