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1. WO2020167427 - GUIDE D'ONDES POUR LA TRANSMISSION DE LUMIÈRE

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

WHAT IS CLAIMED IS:

1. An optical device comprising:

a stack of curved optical elements, the stack comprising:

a first curved optical element stacked with a second curved optical element, wherein the second curved optical element is configured to propagate light by total internal reflection;

an incoupling diffractive grating configured to incouple the light into the second curved optical element; and

an outcoupling diffractive grating optically coupled to the incoupling diffractive grating through the second curved optical element, the outcoupling diffractive grating configured to direct the light,

wherein the first curved optical element has a first refractive index, wherein the second curved optical element has a second refractive index, and wherein the first refractive index is different from the second refractive index by approximately 0.15 to 1.2.

2. The optical device of claim 1, wherein:

the stack further comprises a third curved optical element stacked with the second curved optical element;

the third curved optical element is configured to protect the second curved optical element; and

the third curved optical element has a third refractive index that is different from the second refractive index by approximately 0.15 to 1.2.

3. The optical device of claims 1 or 2, wherein the first and/or third refractive indices are higher than the second refractive index.

4. The optical device of claims 1 or 2, wherein the first and/or third refractive indices are lower than the second refractive index.

5. The optical device of any one of claims 1 to 4, wherein the first and/or third refractive indices are between approximately 1.4-1.6 and the second refractive index is greater than approximately 1.7.

6. The optical device of any one of claims 1 to 5, wherein the outcoupling diffractive grating is further configured to redirect at least a portion of the light into the second curved optical element.

7. The optical device of any one of claims 1 to 6, wherein the outcoupling diffractive grating is further configured to outcouple at least a portion of the light into the first curved optical element.

8. The optical device of any one of claims 1 to 7, wherein the outcoupling diffractive grating is positioned along an interface between the first curved optical element and the second curved optical element, along another interface between the second curved optical element and third curved optical element, or inside the second curved optical element.

9. The optical device of any one of claims 1 to 8, wherein the incoupling diffractive grating is positioned along an interface between the first curved optical element and the second curved optical element, along another interface between the second curved optical element and third curved optical element, or inside the second curved optical element.

10. The optical device of any one of claims 1 to 9, wherein the outcoupling diffractive grating comprises a reflective grating or a refractive grating.

11. The optical device of any one of claims 1 to 10, wherein the incoupling diffractive grating comprises a reflective grating or a refractive grating.

12. The optical device of any one of claims 10 or 11, wherein the outcoupling diffractive grating and the incoupling grating are further configured to direct the light using -1 st order transmission, +lst order transmission, -1st order reflection, and/or +lst order reflection.

13. The optical device of any one of claims 1 to 12, wherein the light is transmitted through the first curved optical element before interacting with the incoupling diffractive grating.

14. The optical device of any one of claims 1 to 12, wherein the light is not transmitted through the first curved optical element before interacting with the incoupling diffractive grating.

15. The optical device of any one of claims 1 to 14, further comprising an interlayer positioned between the first curved optical element and the second curved optical element, and/or another interlayer positioned between the second curved optical element and third curved optical element.

16. The optical device of any one of claims 15, wherein the interlayer and/or another interlayer comprise an air gap or adhesive material.

17. The optical device of any one of claims 1 to 16, wherein the light comprises a red, green, and/or blue wavelengths.

18. The optical device of any one of claims 1 to 17, wherein the first curved optical element, the second curved optical element, and/or third curved optical element comprise a rigid body configured to support the optical device and prevent the optical device from bending.

19. The optical device of any one of claims 1 to 18, further comprising a horizontal base curve greater than approximately base 2, base 4, base 6, base 8, or base 10.

20. The optical device of any one of claims 1 to 19, wherein a thickness of the second curved optical element does not exceed approximately 1000 microns, 800 microns, or 600 microns.

21. The optical device of any one of claims 1 to 20, wherein a thickness of the optical device does not exceed approximately 15.0 mm, 12.0 mm, 11 mm, or 10 mm.

22. The optical device of any one of claims 1 to 21, wherein the second curved optical element comprises silicon nitride, silicon oxy nitride, hafnia, alumina, tantala, tantalum oxy nitrides, titanium dioxide, or zirconia, scandium oxide, niobium oxide, lanthanum titanate, lanthana, ceria, praseodymia, or yttria.

23. The optical device of any one of claims 1 to 22, wherein the first curved optical element and/or third curved optical element comprise polymethylmethacrylate, polymethylpentene, cyclo olefin polymer, cyclic olefin copolymer, styrene acrylate, polycarbonate, CR-39, polystyrene, polyetherimide, polyethersulfone, polyethylene terephthalate, or high purity fused silica.

24. The optical device of any one of claims 1 to 23, wherein the third curved optical element comprises an optical shape configured to provide ophthalmic corrective power on a real-world image.

25. The optical device of claim 24, wherein the ophthalmic corrective power is between approximately -10 to 10 diopter.

26. The optical device of any one of claims 1 to 25, wherein the outcoupling diffractive grating is further configured to direct the outcoupled portion of the light such that the light converges, diverges, or is substantially collimated.

27. The optical device of any one of claims 1 to 26, wherein the first curved optical element comprises an optical shape configured to redirect the outcoupled portion of the light such that the light converges, diverges, or is substantially collimated as the light exits the first curved optical element.

28. The optical device of any one of claims 1 to 27, further comprising a maximum horizontal field of view greater than approximately 40 degrees and less than approximately 140 degrees, greater than approximately 60 degrees and less than approximately 140, greater than approximately 80 degrees and less than approximately 140, greater than approximately 100

degrees and less than approximately 140, or greater than approximately 120 degrees and less than approximately 140.

29. The optical device of any one of claims 1 to 28, further comprising at least an intermediate grating configured to expand the incoupled light so that the outcoupled portion of the light forms a two-dimensional array where each member of the two-dimensional array is a replication of the incoupled light.

30. A system of optical devices, the system comprising a plurality of the optical devices of claim 1.