Optically variable and machine-readable device for use on...

Details Optically variable and machine-readable device for use on... Optically variable and machine-readable device for use on...

B - Operations, Transporting

44

F

B44F 1/12 (2006.01) B41M 3/14 (2006.01) B42D 15/00 (2006.01) G03G 21/04 (2006.01)

Patent

CA 2088960

Abstract of the Disclosure An optically variable device for use on security documents to deter unauthorized reproduction is provided which contains a warning message that is not readily apparent to an observer but that reproduces as a visible warning message when copied. The device comprises a pattern of light reflecting surfaces which comprise a reflection diffraction grating having a plurality of grooves that vary in orientation and blaze angle. In an alternative embodiment, a machine-readable optically variable device is provided in which the pattern of specularly light-reflecting surfaces produces a machine-readable message in response to light impinging on the device.

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