Polarizing optical system

• US 10,261,321 B2
• Filed: 10/10/2016
• Issued: 04/16/2019
• Est. Priority Date: 11/08/2005
• Status: Active Grant

• Current Assignee: Lumus Ltd.
• Original Assignee: Lumus Ltd.
• Inventors: Amitai, Yaakov
• Primary Examiner(s): Shafer, Ricky D
• Application Number:
  US15/289,712
• Publication Number:
  US 20170052376A1
• Time in Patent Office: 918 Days
• Field of Search: 35948703, 35948907, 35948908, 35948915, 359641, 359630, 385 11, 385 36
• CPC Class Codes: G02B 2027/0125 Field-of-view increase by wavefront division
• CPC Class Codes: G02B 2027/0178 Eyeglass type eyeglass details G02C
• CPC Class Codes: G02B 27/0172 characterised by optical features
• CPC Class Codes: G02B 27/283 used for beam splitting or combining
• CPC Class Codes: G02B 27/285 comprising arrays of elements, e.g. microprisms
• CPC Class Codes: G02B 27/286 for controlling or changing the state of polarisation, e.g. transforming one polarisation state into another G02B5/3083 takes precedence; light guide coupling means utilising polarising elements G02B6/34
• CPC Class Codes: G02B 5/3058 comprising electrically conductive elements, e.g. wire grids, conductive particles
• CPC Class Codes: G02B 5/3083 Birefringent or phase retarding elements G02B5/3008, G02B5/3016 take precedence; systems for polarisation control G02B27/286; manufacturing phase modulating patterns by lithographic processes G03F7/001
• CPC Class Codes: G02B 6/003 Lens or lenticular sheet or layer
• CPC Class Codes: G02B 6/0035 provided on the surface of the light guide or in the bulk of it
• CPC Class Codes: G02B 6/0056 for producing polarisation effects, e.g. by a surface with polarizing properties or by an additional polarizing elements
• CPC Class Codes: G02B 6/34 utilising prism or grating G02B6/293 takes precedence

Abstract

There is provided an optical system, including a light-transmitting substrate having at least two major surfaces parallel to each other edges, and an optical device for coupling light into the substrate by total internal reflection. The device includes a polarization sensitive reflecting surface.

Claims

1. An optical system, comprising:

a light-transmitting substrate having at least two major surfaces parallel to each other defining sides of the substrate, and edges;

an array of partially reflecting surfaces embedded inside the substrate between the two major surfaces, wherein the surfaces are not parallel to the major surfaces of the substrate;

an optical device for coupling input light waves emanating from a display source into the substrate to be trapped inside the substrate by total internal reflection; and

at least two partially reflecting surfaces of said array of partially reflecting surfaces partially coupling light waves out of the substrate as image light waves, the input light waves entering the substrate and the image light waves exiting the substrate at the same side of the substrate.

2. The optical system according to claim 1, wherein one surface of the array of partially reflecting surfaces comprises the optical device for coupling light waves into the substrate.

3. The optical system according to claim 2, wherein the optical device is embedded inside the substrate and all the surfaces embedded inside the substrate are parallel to each other.

4. The optical system according to claim 2, wherein the optical device for coupling light is a polarization sensitive reflecting surface.

5. The optical system according to claim 1, wherein the at least two partially reflecting surfaces are coated with angular sensitive thin-film coatings.

6. The optical system according to claim 1, wherein the optical device for coupling light is a polarizing beam splitter.

7. The optical system according to claim 6, wherein the optical device for coupling light reflects s-polarized light and transmits p-polarized light.

8. The optical system according to claim 6, wherein the optical device for coupling light reflects p-polarized light and transmits s-polarized light.

9. The optical system according to claim 6, wherein the optical device for coupling light comprises a polarization sensitive thin film dielectric coating.

10. The optical system according to claim 6, wherein the optical device for coupling light comprises a wire grid polarizer.

11. The optical system according to claim 1, further comprising a first quarter-wave retardation member located next to one of the major surfaces.

12. The optical system according to claim 11, wherein the first quarter-wave retardation member is positioned on a side opposite to the input light waves and the coupled-out image light waves.

13. The optical system according to claim 12, further comprising a converging lens located next to the first quarter-wave retardation member.

14. The optical system according to claim 13, wherein the converging lens has front and back surfaces, and the back surface of the converging lens is coated with a reflecting coating.

15. The optical system according to claim 13, wherein the converging lens is a planoconvex lens.

16. The optical system according to claim 11, further comprising a reflecting surface located next to the first quarter-wave retardation member.

17. The optical system according to claim 16, wherein the reflecting surface is cemented to the first quarter-wave retardation member.

18. The optical system according to claim 16, wherein the reflecting surface is coated on a back side of the first quarter-wave retardation member.

19. The optical system according to claim 16, wherein the first quarter-wave retardation member is a film laminated on a front surface of the reflecting surface.

20. The optical system according to claim 1, further comprising an optical module for collimating the input light waves emanating from the display source.

21. The optical system according to claim 20, wherein the input light waves are linearly polarized.

22. The optical system according to claim 20, wherein the light waves are unpolarized.

23. The optical system according to claim 20, wherein the collimating optical module comprises a folding prism.

24. The optical system according to claim 23, further comprising at least one polarizer beamsplitter embedded inside the folding prism.

25. The optical system according to claim 24, further comprising a second quarter-wave retardation member located next to the folding prism.

26. The optical system according to claim 25, further comprising at least one converging lens located next to the second quarter-wave retardation member.

27. The optical system according to claim 26, wherein a back surface of the at least one converging lens, is coated with a reflective coating.

28. The optical system according to claim 23, further comprising a second converging lens having front and back surfaces, located next to the first quarter-wave retardation member.

29. The optical system according to claim 28, wherein the converging lens is a planoconvex lens.

30. The optical system according to claim 28, wherein the back surface of the converging lens is coated with a reflective coating.

31. The optical system according to claim 28, wherein the second converging lens is optically attached to the first quarter-wave retardation member.

32. The optical system according to claim 28, wherein the second converging lens is a collimating lens.

33. The optical system according to claim 28, wherein the folding prism and the second converging lens are positioned on the two opposite sides of the substrate.

34. The optical system according to claim 20, wherein the optical module is assembled inside an arm portion of an eyeglasses frame.

35. The optical system according to claim 1, wherein the image light waves are coupled-out of the substrate into a viewer'"'"'s eye.

36. The optical system according to claim 1, wherein the display source and a viewer'"'"'s eye are positioned at the same side of the substrate.

37. The optical system according to claim 1, wherein the optical system is embedded in an eyeglasses frame.