Patent ID: 9646235
Date: 2017-05-09
CPC Classifications: B29C,B29D,B29K,G06K

Claim:
1. A method for producing a part or replica by molding or casting with an embedded 2D barcode defined in the surface of said part and said embedded 2D barcode subsequently being readable using a light source and a camera, said method comprising at least the following steps: providing an initial mold with an array of individual areas of optical anisotropic surface structures, where at least a number of said individual optical anisotropic structures forms a two-dimensional barcode or data matrix; and making a replica of the mold using a molding or casting process, thereby making a part comprising a replica of said array of individual areas of optical anisotropic surface structures, wherein said replica of said mold, comprising said array of individual areas of optical anisotropic structures, has the property that the directional reflection coefficient of the individual areas of optical anisotropic surface structures is dependent on the illumination angle and detection angle in a way that is not rotationally symmetric around the axis normal to the surface of said replica, wherein said array of individually optical anisotropic surface structures of said replica thereby being readable by illumination and detection of reflection intensity of said illumination source under a non-normal angle to the surface of said replica, and wherein the individual areas of optical anisotropic structures in the mold are independently rotatable in such a way that a new code can be defined in the mold between each molding or casting process.