Optically variable and machine-readable device for use on securi

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

1992-03-30

1995-04-04

Bell, Paul A.

Printed matter

Having revealable concealed information, fraud preventer or...

Utilizing electromagnetic radiation

283 86, 283 94, 283904, B42D 1500

Patent

active

054030404

ABSTRACT:
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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