Article comprising an authenticated item of sheet material...

Details Article comprising an authenticated item of sheet material... Article comprising an authenticated item of sheet material...

G - Physics

02

B

88/120

G02B 27/00 (2006.01)

Patent

CA 1198919

AN ARTICLE COMPRISING AN AUTHENTICATED ITEM OF SHEET MATERIAL AND AN AUTHENTICATING DEVICE BONDED THERETO Abstract An article comprises an item of sheet material, which is subject to counterfeiting, and an authenticating device bonded to the item. The device includes: a substrate bonded to the sheet material with at least one diffraction grating embossed as a relief pattern in a viewable surface of the substrate material; a solid material deposited with the same thickness on a given portion of each period of the diffraction grating; and an overcoat which covers the relief pattern. The polarization and color characteristics of light reflected from each such grating structure of the device, when viewed at a given viewing angle, are determined by the viewing angle and by: (1) the values of the respective indices of refraction, (2) the waveform of the diffraction grating, (3) the thickness and shape characteristics of the deposited material, and (4) the period, amplitude and overall thickness of the diffraction grating.

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