Patterned structures with optically variable effects
View Patent ↗An optical structure includes a light transmissive substrate having a surface relief pattern applied thereon, such as a hologram. One or more layers can be patterned corresponding to materials playing the role of absorbers or reflectors on a Fabry-Perot type of optical structure. These materials are applied over portions of the surface relief pattern so as to form alphanumeric characters, bars codes, or pictorial or graphical designs. Additional layers may be applied to the patterned layer of the reflective or absorber materials and exposed portions of the surface relief pattern in order to provide desirable optical effects to the exposed portions of the surface relief pattern. In some embodiments, the optically active coating is a color shifting thin film, or contains color shifting flakes based on Fabry Perot designs.
1. An optical structure comprising: a substrate having a first surface and an opposing second surface, the second surface having a surface relief pattern formed thereon; one or more layers of different materials supported by the second surface of the substrate, at least one of the one or more layers having the surface relief pattern formed therein, wherein one of the one or more layers is deposited so as to form a pattern of windowed and non-windowed regions formed therein such that the layer material is absent in the windowed regions and present in the non-windowed regions, wherein at least one of the one or more layers form an optically active color-shifting coating, wherein the color-shifting coating has a visibly changing color with a change in viewing angle or a change of angle of incident light and wherein different optical effects are seen when viewing the optical structure through the windowed and non-windowed regions, wherein at least one of the different optical effects is a diffractive or thin-film interference effect and another optical effect is a combined thin-film interference effect and a diffractive effect.
2. An optical structure comprising: a substrate having a first surface and an opposing second surface, the second surface having a surface relief pattern formed thereon; one or more layers of different materials supported by the second surface of the substrate, at least one of the one or more layers having the surface relief pattern formed therein, wherein one of the one or more layers is deposited so as to form a pattern of windowed and non-windowed regions formed therein such that the layer material is absent in the windowed regions and present in the non-windowed regions, wherein at least one of the one or more layers form an optically active color-shifting coating, wherein the color-shifting coating has a visibly changing color with a change in viewing angle or a change of angle of incident light and wherein different optical effects are seen when viewing the optical structure through the windowed and non-windowed regions,
wherein the active color-shifting coating is a multilayer coating including an absorber layer, a dielectric layer and a reflective layer.
3. An optical structure as defined in claim 2 , wherein some of the layers of the multilayer color shifting coating span the windowed and non-windowed regions, and wherein at least one layer of the color shifting coating is present in the non-windowed regions and is absent in the windowed regions, there by producing a strong color shifting effect in the non-windowed regions.
4. An optical structure as defined in claim 3 wherein the active color-shifting coating absorbing layer is Cr, and wherein the dielectric and reflective layers are MgF 2 and Al respectively.
5. An optical structure as defined in claim 4 , wherein the Cr, MgF 2 , and Al layers have the surface relief pattern formed therein.
6. An optical structure as defined in claim 5 wherein the at least one of the layers having the surface relief pattern formed therein is a layer which together with other layers form a color-shifting coating, and wherein the other layers that form the color-shifting coating also have the surface relief pattern formed therein.
7. An optical structure as defined in claim 3 wherein the active color-shifting coating absorbing layer is aluminum, and wherein the dielectric and reflective layers are MgF 2 and Al respectively.
8. An optical structure comprising: a substrate having a first surface and an opposing second surface, the second surface having a surface relief pattern formed thereon; one or more layers of different materials supported by the second surface of the substrate, at least one of the one or more layers having the surface relief pattern formed therein, wherein one of the one or more layers is deposited so as to form a pattern of windowed and non-windowed regions formed therein such that the layer material is absent in the windowed regions and present in the non-windowed regions, wherein at least one of the one or more layers form an optically active color-shifting coating, wherein the color-shifting coating has a visibly changing color with a change in viewing angle or a change of angle of incident light and wherein different optical effects are seen when viewing the optical structure through the windowed and non-windowed regions,
wherein the active color-shifting coating is a multilayer coating including a high dielectric layer having a refractive index of at least 1.65 and a reflective layer.
9. An optical structure as defined in claim 8 , wherein the high dielectric material is ZnS.
10. An optical structure comprising: a first structure including: an organic layer having a first surface and an opposing second surface, the second surface having a surface relief pattern formed thereon; a plurality of layers of different materials supported by or supporting the organic layer, at least one of the layers having the surface relief pattern formed therein, wherein one of the plurality of layers is deposited so as to form a pattern of windowed and non-windowed regions formed therein such that the layer material is absent in the windowed regions and present in the non-windowed regions, wherein at least one of the layers form an optically active color-shifting coating, and wherein different optical effects are seen when viewing the optical structure through the windowed and non-windowed regions,
wherein the optically active color shifting coating is a Fabry-Perot structure.
11. An optical structure having a first side and a second side wherein at least one of the sides, is a viewing side, from which a pattern can be seen, comprising:
a substrate with a first surface having a relief structure thereon in at least predetermined regions thereof;
an arrangement of side-by-side Fabry-Perot and non-Fabry-Perot filters, visible from the viewing side, each of the side-by-side filters having a first layer deposited on the first surface, wherein the Fabry-Perot filters are color shifting filters for providing a visible change in color with a change in an angle of incident light or viewing angle, and wherein each of the Fabry-Perot filters have three same ordered layers including an absorber layer a dielectric layer and a reflector layer, and wherein the non- Fabry-Perot filters are absent color shifting effects and are absent at least one of said three layers present in the Fabry-Perot filters, wherein visible optical effects of the Fabry-Perot filters and non- Fabry-Perot filters are visibly distinguishable, characterized in that: regions where the Fabry-Perot filters reside alternate with regions where the non-Fabry-Perot filters reside, and the optical structure exhibits an optical effect associated with the relief structure in the regions where the Fabry-Perot filters reside, and does not exhibit the optical effect associated with the relief structure in the regions where the non-Fabry-Perot filters reside.