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AssigneeKoninklijke Philips Electronics N.V.
InventorsWil Ophey, Pim Theo Tuyls, Boris Skoric, Antonius Hermanus Maria Akkermans
Estimating the term…
The invention relates to an optical identifier (30) for generating an identification signal in response to an incident radiation beam (12), and to a corresponding method. In order to provide an optical identifier (30) which can be produced by a simplified process and which has nevertheless a sufficient or even improved stability against environmental interferences it is proposed that said identifier comprises a carrier layer (32), at least partially transparent to said radiation beam (12), having a first scattering face (34) comprising a plurality of randomly oriented partial faces for scattering at least a part of said radiation beam (12), wherein said identification signal is formed by a scattered part of said radiation beam (12). Further, a device comprising said identifier, and a reading apparatus for identifying the identifier are proposed.
Optical identifier (10, 30, 50, 70, 80, 100, 120) for generating an identification signal in response to an incident radiation beam (12), said identifier comprising a carrier layer (14, 32, 52, 76, 82, 102, 122) at least partially transparent to said radiation beam, wherein said carrier layer has a first scattering face (16, 34, 54, 74, 84, 104, 124) comprising a plurality of randomly oriented partial faces for scattering at least a part of said radiation beam (12), said identification signal being formed by said part of said radiation beam scattered traversing said carrier layer.
Method for generating an identification signal in response to a radiation beam comprising the steps of:
Reading apparatus (134) for identifying an optical identifier (10, 30, 50, 70, 80, 100, 120) for generating an identification signal in response to an incident radiation beam, said identifier comprising a carrier layer at least partially transparent to said radiation beam, wherein said carrier layer has a first scattering face comprising a plurality of randomly oriented partial faces for scattering at least a part of said radiation beam, said identification signal being formed by said part of said radiation beam scattered traversing said carrier layer, said carrier layer being covered with a protective layer adapted for changing a polarization status of said radiation beam, in particular being birefringent, said reading apparatus (134) comprising a radiation source (18) for generating said radiation beam (12), an imaging device (24) for detecting said identification signal and a circular polarizer (136) arranged in the course of said radiation beam (12) and said identification signal.
Dependencies are inferred from the claim text.