Marking device for identifying article, has patterns engraved on upper face of semiconductor substrate and arranged in matrix, where depths of patterns are variable and have distinct values for representing additional information

摘要

The device (1) has multiple patterns (2-4, 12-14) engraved on an upper face (5) of a substrate in semiconductor material e.g. silicon. The patterns have a square shape and are arranged in matrix to represent information. The patterns have variable depths that have distinct values to represent additional information. The patterns are formed by folding frustums of a pyramid. Independent claims are also included for the following: (a) an article integrating a marking device (b) a marking detection device for analyzing a marking device.