G - Physics – 02 – B
Patent
G - Physics
02
B
88/0.11
G02B 27/42 (2006.01) G02B 5/28 (2006.01) G06K 1/12 (2006.01) G06K 7/14 (2006.01) G06K 19/16 (2006.01) G07F 7/08 (2006.01)
Patent
CA 1077314
ABSTRACT OF THE DISCLOSURE An information-carrier contains at least one dif- fraction screen which modifies the trace of the rays from a reading device and has a specific structure representing the authenticity information. The reading device consists of a light source and at least two photodetectors arranged in different diffraction arrangements and connected to a decision logic device. The decision logic device releases an authenti- city signal when the amounts of energy in the diffraction arrangements fitted with photodetectors are in a predetermined relationship with each other. In one embodiment, the information carrier is an identity card or a tape arranged in a cassette. The diffraction screen has a symmetrical rectangular groove profile. Associated with each photodetector is one threshold switch of the decision logic device. The dif- fraction screen is imprinted with a master-diffraction grating in the information carrier. The said master-diffraction grating is produced by exposing a light-sensitive layer with two interfering coherent beams and then developing.
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