Machine readable conductive array and devices for reading the same

摘要

The invention relates to two-dimensional machine readable codes, to devices for reading such codes and to systems for creating such codes. The machine readable code 3 comprises an array of electrically conductive code elements 9 that are electrically connected to each other, preferably by using a grid 27. The machine readable codes are formed by printing them onto a substrate using conductive ink. A capacitive sensing transducer 13 may be used to read the code wherein the transducer can also be used to read fingerprints.