Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
April 12, 2022
Patent Application Number
16652365
Date Filed
September 28, 2018
Patent Citations
Patent Primary Examiner
The invention relates to a thin optical security element comprising a reflective or refractive light-redirecting surface having a relief pattern operable to redirect incident light from a light source and form a projected image on a projection surface, the projected image comprising a caustic pattern reproducing a reference pattern that is easily visually recognizable by a person. The invention also relates to a method for designing a relief pattern of a light-redirecting surface of a thin optical security element.
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