Optical switch devices
An optical device includes an array of lenses and a plurality of first and second segments disposed under the array of lenses. At a first viewing angle, the array of lenses presents a first image for viewing without presenting the second image for viewing, and at a second viewing angle different from the first viewing angle, the array of lenses presents for viewing the second image without presenting the first image for viewing. In some examples, individual ones of the first and second segments can comprise specular reflecting, transparent, diffusely reflecting, and/or diffusely transmissive features. In some examples, individual ones of the first and second segments can comprise transparent and non-transparent regions. Some examples can incorporate more than one region producing an optical effect.
1. An optical device comprising:
an array of lenses;
a plurality of first and second segments disposed under the array of lenses, the first segments corresponding to portions of an icon and a background; and
a substrate having a first side and a second side opposite the first side,
wherein the array of lenses is disposed on the first side of the substrate,
wherein the first and second segments are disposed on the second side of the substrate,
wherein at a first viewing angle, the array of lenses presents the icon for viewing, and at a second viewing angle different from the first viewing angle, the array of lenses does not present the icon for viewing, and
wherein for the first segments,
transparent features define the icon, and non-transparent features define the background, or
transparent features define the background, and non-transparent features define the icon.
2. The device of claim 1 , wherein for the first segments, the transparent features define the icon, and the non-transparent features define the background.
3. The device of claim 1 , wherein for the first segments, the transparent features define the background, and the non-transparent features define the icon.
4. The device of claim 1 , wherein the non-transparent features are specular reflecting regions.
5. The device of claim 1 , further comprising a layer of material, wherein the transparent features are disposed over the layer of material.
6. The device of claim 5 , wherein the layer of material comprises a window, and wherein the transparent features are disposed over the window.
7. The device of claim 1 , wherein the device is configured to provide authenticity verification on an item for security.
8. The device of claim 7 , wherein the item is a credit card, a debit card, currency, a passport, a driver's license, an identification card, a document, a ticket, a tamper evident container or packaging, or a bottle of pharmaceuticals.
9. The device of claim 7 , further comprising an additional transparent region disposed over information on the item.
10. The device of claim 9 , wherein the information comprises printed information, graphics, or a photograph.
11. The device of claim 9 , wherein the transparent region comprises a material having a refractive index of about 1.8 to about 2.75.
12. The device of claim 11 , wherein the material comprises zinc sulfide, titanium dioxide, tantalum pentoxide, zirconium dioxide, or a combination thereof.
13. The device of claim 1 , wherein the non-transparent features comprise diffusely reflective features or the transparent features comprise diffusely transmissive features, and wherein the device comprises a kinoform diffuser providing the diffusely reflective features or the diffusely transmissive features.
14. The device of claim 1 , wherein the array of lenses comprises a 1D lens array comprising a series of lenses in one direction.
15. The device of claim 1 , wherein the array of lenses comprises a 2D array of lenses comprising a series of lenses in two directions.
16. An optical device configured to provide authenticity verification on an item for security, the device comprising:
an array of lenses;
a plurality of first and second segments disposed under the array of lenses, the first segments corresponding to portions of an icon and a background; and
a transparent region disposed over information on the item,
wherein the transparent region comprises a material having a refractive index of about 1.8 to about 2.75,
wherein at a first viewing angle, the array of lenses presents the icon for viewing, and at a second viewing angle different from the first viewing angle, the array of lenses does not present the icon for viewing, and
wherein for the first segments,
transparent features define the icon, and non-transparent features define the background, or
transparent features define the background, and non-transparent features define the icon.
17. The device of claim 16 , wherein the material comprises zinc sulfide, titanium dioxide, tantalum pentoxide, zirconium dioxide, or a combination thereof.
18. The device of claim 16 , wherein for the first segments, the transparent features define the icon, and the non-transparent features define the background.
19. The device of claim 16 , wherein for the first segments, the transparent features define the background, and the non-transparent features define the icon.
20. The device of claim 16 , wherein the non-transparent features are specular reflecting regions.
21. The device of claim 16 , further comprising a layer of material, wherein the transparent features are disposed over the layer of material.
22. The device of claim 21 , wherein the layer of material comprises a window, and wherein the transparent features are disposed over the window.
23. The device of claim 16 , wherein the item is a credit card, a debit card, currency, a passport, a driver's license, an identification card, a document, a ticket, a tamper evident container or packaging, or a bottle of pharmaceuticals.
24. The device of claim 16 , wherein the information comprises printed information, graphics, or a photograph.
25. The device of claim 16 , wherein the non-transparent features comprise diffusely reflective features or the transparent features comprise diffusely transmissive features, and wherein the device comprises a kinoform diffuser providing the diffusely reflective features or the diffusely transmissive features.
26. The device of claim 16 , wherein the array of lenses comprises a 1D lens array comprising a series of lenses in one direction.
27. The device of claim 16 , wherein the array of lenses comprises a 2D array of lenses comprising a series of lenses in two directions.