Security device
First Claim
1. A security device comprising:
- luminescent materials in distinct, non-overlapping regions of the device from one another, that are the same or different from one another, with no overlap between any luminescent materials, that when stimulated emit luminescent radiations from the distinct, non-overlapping regions of the security device;
an angle-dependent optical filter coupled to one of the luminescent materials so that luminescent radiation emitted therefrom is transmitted through and emitted from the filter only at certain angles, to selectively coincide with luminescent radiation emitted from another of the luminescent materials, thereby to form a composite image comprising the luminescent radiations emitted from the luminescent materials in said distinct, non-overlapping regions of the device only when the device is viewed at said certain angles.
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Accused Products
Abstract
A security device with multiple layers. A substrate provides the backing to a first luminescent layer. An optically variable structure is positioned between the first luminescent layer and a second luminescent layer. Both the first and second luminescent layers emit luminescent radiation when stimulated. When the first layer is stimulated, the optically variable structure filters the emitted luminescent radiation such that the emitted luminescent radiation only escapes the optically variable structure at a predetermined range of emission angles. A user, when viewing the security device from the predetermined range of angles as both layers are stimulated, can see a completed image of a predetermined indicia. When the security device is viewed at angles other than the predetermined range of angles as both layers are stimulated, a user will only see an incomplete image of the predetermined indicia.
39 Citations
10 Claims
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1. A security device comprising:
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luminescent materials in distinct, non-overlapping regions of the device from one another, that are the same or different from one another, with no overlap between any luminescent materials, that when stimulated emit luminescent radiations from the distinct, non-overlapping regions of the security device; an angle-dependent optical filter coupled to one of the luminescent materials so that luminescent radiation emitted therefrom is transmitted through and emitted from the filter only at certain angles, to selectively coincide with luminescent radiation emitted from another of the luminescent materials, thereby to form a composite image comprising the luminescent radiations emitted from the luminescent materials in said distinct, non-overlapping regions of the device only when the device is viewed at said certain angles. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification