Optical products, masters for fabricating optical products, and methods for manufacturing masters and optical products
An optical product can be configured to be an anti-counterfeit feature such as a patch, a window, or a thread on a banknote. The optical product can be configured, when illuminated, to reproduce by reflected or refracted light, a 3D image of at least a part of a 3D object. The optical product can include a first surface and a second surface opposite the first surface. The second surface can include a plurality of portions. Each portion can correspond to a point on a surface of the 3D object. Each portion can include features corresponding to non-holographic elements on the optical product. A gradient in the features can correlate to an inclination of the surface of the 3D object at the corresponding point. An orientation of the features can correlate to an orientation of the surface of the 3D object at the corresponding point.
1. An optical product configured, when illuminated, to reproduce by reflected or refracted light, an image that appears 3D of at least a part of a 3D object, said optical product comprising:
a first surface; and
a second surface opposite said first surface, said second surface comprising a plurality of portions, each portion corresponding to a point on a surface of said 3D object, each portion comprising one or more non-holographic features configured to produce at least part of said image without relying on diffraction or Fresnel lenses at viewing angles through a range of angles of 20 degrees to 160 degrees relative to a plane of the optical product as the optical product is tilted,
wherein a gradient in said non-holographic features correlates to an inclination of said surface of said 3D object at said corresponding point,
wherein an orientation of said non-holographic features correlates to an orientation of said surface of said 3D object at said corresponding point, and
wherein said one or more non-holographic features comprise non-linear saw tooth shaped facets when viewed in a cross-section orthogonal to said first and second surfaces.
2. The optical product of claim 1 , wherein said optical product is configured to provide authenticity verification on an item for security.
3. The optical product of claim 2 , wherein said item for security comprises currency, a credit card, a debit card, a passport, a driver's license, an identification card, a document, a tamper evident container or packaging, or a bottle of pharmaceuticals.
4. The optical product of claim 1 , wherein said optical product is an embedded feature, a laminated feature, a hot stamp feature, windowed thread feature, or a transparent window feature.
5. The optical product of claim 1 , wherein said second surface comprises a coating comprising a reflective material.
6. The optical product of claim 5 , wherein the reflective material comprises aluminum, copper, or silver.
7. The optical product of claim 1 , wherein said second surface comprises a transparent, relatively high refractive index coating.
8. The optical product of claim 7 , wherein said coating comprises ZnS or TiO 2 .
9. The optical product of claim 1 , wherein said 3D object comprises an irregularly shaped object.
10. The optical product of claim 1 , wherein said one or more non-holographic features further comprise linear facets when viewed in a cross-section orthogonal to said first and second surface.
11. The optical product of claim 1 , wherein said 3D object comprises a non-symmetrical shaped object.
12. The optical product of claim 11 , wherein said 3D object comprises one or more animals, humans, plants, trees, landscapes, buildings, cars, boats, airplanes, bicycles, furniture, office equipment, drinks, personal care items, or flags.
13. The optical product of claim 1 , wherein said non-linear facets are configured to produce a mirror-like image by reflecting light.
14. The optical product of claim 1 , wherein said 3D object comprises an object in nature.
15. The optical product of claim 1 , wherein said 3D object comprises a man-made object.