Optical products, masters for fabricating optical products, and methods for manufacturing masters and optical products
An optical product can reproduce a first 3D image of at least part of a first 3D object and a second 3D image of at least part of a second 3D object. The optical product comprises a surface configured, when illuminated, to reproduce by reflected or transmitted light, the first 3D image without reproducing the second 3D image at a first angle of view, and the second 3D image without reproducing the first 3D image at a second angle of view. Each portion of first portions can correspond to a point on a surface of the first 3D object, and comprise first non-holographic features configured to produce at least part of the first 3D image. Each portion of second portions can correspond to a point on a surface of the second 3D object, and comprise second non-holographic features configured to produce at least part of the second 3D image.
1. An optical product configured to reproduce a first 3D image of at least part of a first 3D object and a second 3D image of at least part of a second 3D object, the optical product comprising:
a first surface; and
a second surface opposite said first surface, said second surface configured, when illuminated, to reproduce by reflected or transmitted light, the first 3D image without reproducing the second 3D image at a first angle of view, and the second 3D image without reproducing the first 3D image at a second angle of view, said second surface comprising:
a first plurality of portions, each portion of said first plurality of portions corresponding to a point on a surface of said first 3D object, each portion comprising first non-holographic features configured to produce at least part of said first 3D image of said first 3D object, and
a second plurality of portions, each portion of said second plurality of portions corresponding to a point on a surface of said second 3D object, each portion of said second plurality of portions comprising second non-holographic features configured to produce at least part of said second 3D image of said second 3D object,
wherein said first and second non-holographic features comprise facets.
2. The optical product of claim 1 ,
wherein a gradient of said first non-holographic features correlates to an inclination of said surface of said first 3D object at said corresponding point on the surface of said first 3D object, and
wherein an orientation of said first non-holographic features correlates to an orientation of said surface of said first 3D object at said corresponding point on the surface of said first 3D object.
3. The optical product of claim 1 ,
wherein a gradient of said second non-holographic features correlates to an inclination of said surface of said second 3D object at said corresponding point on the surface of said second 3D object, and
wherein an orientation of said second non-holographic features correlates to an orientation of said surface of said second 3D object at said corresponding point on the surface of said second 3D object.
4. The optical product of claim 1 , further comprising borders surrounding at least part of said portions of said first and second plurality of portions.
5. The optical product of claim 1 , wherein some of said portions of said first and second plurality of portions form a periodic array.
6. The optical product of claim 5 , wherein said periodic array includes a striped, zigzagged, checkerboard, or houndstooth pattern.
7. The optical product of claim 1 , wherein said portions of said first and second plurality of portions form an aperiodic array.
8. The optical product of claim 1 , wherein said optical product when tilted in a direction from said first angle of view to said second angle of view, said first 3D image appears to change to said second 3D image in a direction orthogonal to said direction from said first angle of view to said second angle of view.
9. The optical product of claim 1 , wherein said first or second non-holographic features have a dimension between 7 μm and 100 μm.
10. The optical product of claim 1 , wherein some of said portions of said first and second plurality of portions comprise features discontinuous with features in surrounding adjacent portions.
11. The optical product of claim 1 , wherein when viewed from a top or front view, said first or second features comprise linear features corresponding to a substantially smooth region of said surface of said first or second 3D object respectively.
12. The optical product of claim 1 , wherein when viewed from a top or front view, said first or second features comprise non-linear features corresponding to a curved region of said surface of said first or second 3D object respectively.
13. The optical product of claim 2 ,
wherein said inclination of said surface of said first 3D object comprises a polar angle from a first reference line of said first 3D object, and
wherein said orientation of said surface of said first 3D object comprises an azimuth angle from a second reference line orthogonal to said first reference line of said first 3D object.
14. The optical product of claim 3 ,
wherein said inclination of said surface of said second 3D object comprises a polar angle from a first reference line of said second 3D object, and
wherein said orientation of said surface of said second 3D object comprises an azimuth angle from a second reference line orthogonal to said first reference line of said second 3D object.
15. The optical product of claim 1 , wherein said second surface comprises a reflective surface.
16. The optical product of claim 1 , wherein said second surface further comprises holographic features.
17. The optical product of claim 16 , wherein said holographic features are integrated into at least one of said portions of said first and second plurality of portions.
18. The optical product of claim 1 , wherein said first or second 3D object comprises an irregularly shaped object.
19. The optical product of claim 1 , wherein said first or second 3D object comprises one or more alphanumeric characters.
20. The optical product of claim 1 , wherein said second surface further comprises additional features that when illuminated, do not reproduce a part of said first or second 3D object.
21. The optical product of claim 1 , wherein said optical product is configured to provide authenticity verification on an item for security.
22. The optical product of claim 21 , wherein said item is 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.
23. The optical product of claim 1 , wherein said facets comprise linear features when viewed in a cross-section orthogonal to said first and second surfaces.
24. The optical product of claim 1 , wherein said facets comprise non-linear features when viewed in a cross-section orthogonal to said first and second surfaces.
25. The optical product of claim 1 , wherein said facets comprise linear and non-linear features when viewed in a cross-section orthogonal to said first and second surfaces.
26. The optical product of claim 1 , wherein said facets are configured such that the intensity of light reflected and/or transmitted through the optical product from the facets is varied to form regions of varying brightness and darkness.