Optical marking device
AssigneeCrime Science Technology
InventorsCosimo Prete, Jérémy Malinge, Gautier Alloyez
Life of this patent
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Abstract
An optical marking device including at least a first layer and a second layer disposed at least partially opposite each other, at least one of the first and second layers having an optically variable element being able to change colour between a first colour and a second colour, the first and second colours contrasting from a colour of the other layer in such a way that when the optically variable element displays the first colour, the first layer is visible and when the optically variable element displays the second colour, the second colour is visible, or when the optically variable element displays the first colour, the second layer is visible and when the optically variable element displays the second colour, the first layer is visible.
Claims18
An optical marking device comprising a first layer and a second layer disposed at least partially opposite one another, at least one of said first and second layers comprising an optically variable element showing a color change between a first color and a second color, said first and second colors being contrasting relative to a color of an other layer among the first layer and the second layer, so that when the optically variable element shows said first color, the first layer is visible and when the optically variable element shows said second color, the second layer is visible or when the optically variable element shows said first color, the second layer is visible and when the optically variable element shows said second color, the first layer is visible, wherein the optically variable element comprises one or more fluorescent compounds, each fluorescent compound being either of a 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene class or of a difluoroboron β-diketonate class (BF2bdks).
An optical marking device comprising a first layer and a second layer disposed at least partially opposite one another, at least one of said first and second layers comprising an optically variable element showing a color change between a first color and a second color, said first and second colors being contrasting relative to a color of an other layer among the first layer and the second layer, so that when the optically variable element shows said first color, the first layer is visible and when the optically variable element shows said second color, the second layer is visible or when the optically variable element shows said first color, the second layer is visible and when the optically variable element shows said second color, the first layer is visible, wherein the first layer and the second layer comprise an optically variable element showing a color change, the optically variable element of the first layer and the optically variable element of the second layer being at least partially superposed and configured in such a way that only the first layer is visible when a first stimulation is applied to the device and that only the second layer is visible when a second stimulation is applied to the device.
An optical marking device comprising a first layer and a second layer disposed at least partially opposite one another, at least one of said first and second layers comprising an optically variable element showing a color change between a first color and a second color, said first and second colors being contrasting relative to a color of an other layer among the first layer and the second layer, so that when the optically variable element shows said first color, the first layer is visible and when the optically variable element shows said second color, the second layer is visible or when the optically variable element shows said first color, the second layer is visible and when the optically variable element shows said second color, the first layer is visible, wherein at least one of the first layer and the second layer is at least partially diffusing in a visible light spectrum.
Dependencies are inferred from the claim text.