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US 2004/0061325 A1Published application
Printed security device and method
AssigneeCanadian Bank Note Company, Limited
InventorsEric A. Lyen, Laurence M. -F. Suzzarini
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AssigneeCanadian Bank Note Company, Limited
InventorsEric A. Lyen, Laurence M. -F. Suzzarini
Estimating the term…
According to one aspect of the invention, a printed security device for a document comprises an intaglio printed latent image which has been printed onto a substrate using a highly reflective ink, wherein the intaglio printed latent image is visible when viewed within a first angle range extending from near-vertical to the plane of the latent image towards the image and also within a second angle range closer to the plane of the image, and is not visible when viewed within an angle range between the first and second angle ranges. A change in viewing angle from one angle range to an adjacent angle range results in a visible latent image becoming invisible or vice versa (creating a flip-flop image visibility effect). According to another aspect of the invention a non-intaglio printed second image is added, preferably between the substrate and the intaglio printed latent image, wherein the second image is visible when viewed within an angle range between the first and second angle ranges of visibility of the intaglio printed latent image and is not visible when viewed at other angles. The flip-flop image visibility effect is thereby enhanced such that distinct images (viz. the intaglio latent image and non-intaglio image) are viewed as the viewing angle of the security device moves from near-vertical to near-horizontal angles.
A printed security device for a document, said security device comprising an intaglio printed latent image which has been printed onto a substrate using a highly reflective ink, wherein said intaglio printed latent image is visible when viewed within a first angle range extending from near-vertical to the plane of said latent image towards said image and also within a second angle range closer to the plane of the image, and is not visible when viewed within an angle range between said first and second angle ranges, whereby a change in viewing angle from one said angle range to an adjacent angle range results in a visible said latent image becoming invisible or an invisible said latent image becoming visible.
A method of making a printed security device for a document, said method comprising intaglio printing a latent image onto a substrate using a highly reflective ink, whereby said intaglio printed latent image is visible when viewed within a first angle range extending from near-vertical to the plane of said latent image towards said image and also within a second angle range closer to the plane of the image, and is not visible when viewed within an angle range between said first and second angle ranges, such that a change in viewing angle from one said angle range to an adjacent angle range results in a visible said latent image becoming invisible or an invisible latent image becoming visible.
A method according to 11 whereby a change in viewing angle between said third angle range and said second angle range results in a visible said second image becoming invisible and an invisible said latent image becoming visible or vice versa.
Dependencies are inferred from the claim text.