Optical elements and methods for making thereof

• US 6,836,371 B2
• Filed: 09/24/2002
• Issued: 12/28/2004
• Est. Priority Date: 07/11/2002
• Status: Expired due to Term

• Current Assignee: Essilor International SA
• Original Assignee: Ophthonix Incorporated
• Inventors: Sverdrup, Larry, Lai, Shui T.
• Primary Examiner(s): Epps, Georgia
• Assistant Examiner(s): CHOI, WILLIAM C
• Application Number:
  US10/253,956
• Publication Number:
  US 20040008319A1
• Time in Patent Office: 826 Days
• Field of Search: 359/642, 351/160.R, 427/504, 427/510, 427/164
• US Class Current: 359/642
• CPC Class Codes: B29D 11/00355 with a refractive index gradient
• CPC Class Codes: B29D 11/00432 Auxiliary operations, e.g. machines for filling the moulds B29D11/00125 takes precedence
• CPC Class Codes: G02B 1/04 made of organic materials, e.g. plastics G02B1/08 takes precedence
• CPC Class Codes: G02B 3/0087 with index gradient
• CPC Class Codes: G02C 2202/12 Locally varying refractive index, gradient index lenses
• CPC Class Codes: G02C 2202/22 Correction of higher order and chromatic aberrations, wave front measurement and calculation

Abstract

Optical elements are made using micro-jet printing methods to precisely control the type, position and amount of polymer deposited onto a substrate. In preferred embodiments, the proportions of two or more different polymer compositions are varied over the course of the deposition process to deposit adjoining polymer pixels in the form of a film on the substrate surface. The optical properties of each adjoining polymer pixel can be selected to provide a predetermined optical property, including a specific value of index of refraction. Preferably, the film has a radially non-monotonic refractive index profile and/or an angularly non-monotonic refractive index profile.

Claims

1. A method for making an optical element, comprising:

(a) forming a first polymer pixel on a substrate, the first polymer pixel comprising a first polymer composition and a second polymer composition in a first ratio;

(b) forming a second polymer pixel adjoining the first polymer pixel, the second polymer pixel comprising the first polymer composition and the second polymer composition in a ratio that is different from the first ratio; and

(c) repeating steps (a)-(b) to thereby form a continuous film comprising a plurality of adjoining polymer pixels.

2. The method of claim 1 in which the forming of the first polymer pixel is by projecting the first polymer composition and the second polymer composition onto the substrate.

3. The method of claim 1 in which the substrate is a lens blank and in which the continuous film has a refractive index profile selected from the group consisting of a radially non-monotonic profile and an angularly non-monotonic profile.

4. The method of claim 3 in which the lens blank is selected from the group consisting of a plano lens, a lens with positive focusing power, a lens with negative focusing power, and a lens with cylindrical power.

5. The method of claim 1 in which the optical element is a lens.

6. The method of claim 5 in which the lens is a progressive addition lens.

7. A method for making an optical element, comprising:

(a) positioning a first spray head and a second spray head at an operative distance from a substrate;

(b) projecting a first droplet from the first spray head onto a pre-selected location on the substrate to form a first deposited droplet, the first droplet comprising a first amount of a first polymer composition;

(c) projecting a second droplet from the second spray head onto the substrate in close proximity to the first deposited droplet, the second droplet comprising a second amount of a second polymer composition;

(d) forming a first polymer pixel on the substrate, the first polymer pixel comprising the first polymer composition and the second polymer composition in a first ratio;

(e) adjusting at least one of the first and second spray heads to allow an additional droplet to be projected, the additional droplet being different from at least one of the first and second droplets;

(f) adjusting the positioning of the first and second spray heads with respect to the substrate; and

(g) repeating steps (a)-(f) to thereby form a second polymer pixel adjoining the first polymer pixel, the second polymer pixel comprising the first polymer composition and the second polymer composition in a second ratio.

8. The method of claim 7 further comprising repeating steps (a)-(g) to thereby form a continuous film comprising a plurality of adjoining polymer pixels.

9. The method of claim 8 further comprising repeating steps (a)-(g) to thereby form a second continuous film overlying the first continuous film.

10. The method of claim 8 in which the substrate is substantially transparent.

11. The method of claim 8 in which at least some of the adjoining polymer pixels have an optical property that differs from each other to thereby provide the continuous film with a profile in the optical property selected from the group consisting of a radially non-monotonic profile and an angularly non-monotonic profile.

12. The method of claim 11 in which the optical property is selected from the group consisting of index of refraction, polarizability, Verdet constant, Kerr constant, electro-optical constant, birefringence, and absorption.

13. The method of claim 12 in which the optical property is index of refraction.

14. The method of claim 13 in which the optical element is a lens.

15. The method of claim 14 in which the substrate is a lens blank, further comprising obtaining a measurement for a wavefront aberration for an eye, the optical element correcting the wavefront aberration when positioned in front of the eye.

16. The method of claim 15 in which the wavefront aberration comprises at least one aberration selected from the group consisting of a low order aberration and a high order aberration.

17. The method of claim 16 in which the lens blank corrects at least a portion of the low order aberration of the eye.

18. The method of claim 17 in which the lens blank is selected from the group consisting of a plano blank, an optical blank with positive focusing power, an optical blank with negative focusing power, an optical blank with focusing power and cylindrical power, and an optical blank with progressive addition lens power.

19. The method of claim 8 in which the first polymer composition and the second polymer composition each individually comprise a type of polymer selected from the group consisting of poly(acrylate), poly(methylmethacrylate), poly(vinylidene chloride), polycarbonate, poly(vinyl butyral), poly(ethylene), ethylene/1-alkene copolymer, poly(ethylene terephthalate), poly(acrylonitrile), poly(butadiene), polystyrene, acrylonitrile-butadiene-styrene terpolymers, allyl diglycol carbonate polymer, poly(methyl pentene), polyamide, poly(2,6-dimethyl-1,4-phenyleneoxide), poly(vinyl methyl ether), epoxy polymer, thiolene polymer, silicone polymer, and copolymers thereof.

20. The method of claim 8 in which the first polymer composition comprises a metal.

21. The method of claim 20 in which the metal is in the form of nanoparticles having a refractive index of about 1.6 or higher.

22. The method of claim 21 in which the nanoparticles comprise TiO₂.

23. The method of claim 8 in which the first and second polymer pixels comprise the same polymer type, the first polymer pixel comprising an amount of a metal that is different from the second polymer pixel.

24. The method of claim 7 in which the forming of the first polymer pixel comprises at least partially intermixing the first deposited droplet and the second deposited droplet.

25. The method of claim 24 in which the at least partial intermixing is accomplished by heating the first deposited droplet and the second deposited droplet.

26. The method of claim 24 in which at least one of the first polymer composition and the second polymer composition comprises a prepolymer.

27. The method of claim 26 which further comprises curing the prepolymer.

28. The method of claim 27 in which the curing comprises heating the prepolymer.

29. The method of claim 27 in which the curing comprises irradiating the prepolymer with irradiation selected from the group consisting of x-ray, ultraviolet, visible, infrared, microwave, millimeter wave, electron beam, ion beam, and particle beam.

30. The method of claim 7 in which the first deposited polymer droplet and the second deposited polymer droplet each has a volume in the range of about 10 picoliters to about 10 microliters.

31. The method of claim 30 in which the first deposited polymer droplet and the second deposited polymer droplet do not intermix, and the forming of the polymer pixel comprises projecting the second droplet from the second spray head onto the substrate adjacent to the first deposited droplet.

32. The method of claim 7 in which a surface treatment is applied to the substrate prior to step (a).

33. The method of claim 32 in which the surface treatment is selected from the group of applying a surfactant, increasing surface energy, decreasing surface energy, increasing hydrophobicity, and decreasing hydrophobicity.

34. The method of claim 7 in which step (d) is conducted prior to, or simultaneously with, step (e).

35. The method of claim 7 in which step (c) is not conducted immediately after step (b).

36. The method of claim 7 in which at least one of the first polymer composition and the second polymer composition comprises a solvent.

37. The method of claim 36 in which the solvent is present in an amount effective to adjust at least one property selected from the group consisting of first polymer composition viscosity, second polymer composition viscosity, and volume ratio of the first polymer composition to the second polymer composition.

38. A method for making an optical element, comprising:

(a) positioning a spray head an operative distance from a substrate;

(b) charging the spray head with a first polymer composition;

(c) projecting a first droplet from the spray head onto the substrate to form a first polymer pixel on the substrate;

(d) charging the spray head with a second polymer composition different from the first polymer composition;

(e) adjusting the positioning of the spray head with respect to the substrate; and

(f) projecting a second droplet from the spray head onto the substrate to form a second polymer pixel adjoining the first polymer pixel.

39. The method of claim 38 further comprising repeating steps (a)-(f) to thereby form a continuous film comprising a plurality of adjoining polymer pixels.

40. The method of claim 39 further comprising repeating steps (a)-(f) to thereby form a second continuous film overlying the first continuous film.

41. The method of claim 38 in which the substrate is substantially transparent.

42. The method of claim 41 in which the plurality of adjoining polymer pixels have an optical property that differs from each other to thereby provide the continuous film with a profile in the optical property selected from the group consisting of a radially non-monotonic profile and an angularly non-monotonic profile.

43. The method of claim 42 in which the optical property is selected from the group consisting of index of refraction, polarizability, Verdet constant, Kerr constant, electro-optical constant, birefringence, and absorption.

44. The method of claim 43 in which the optical property is index of refraction.

45. The method of claim 44 in which the optical element is a lens.

46. The method of claim 45 in which the substrate is a lens blank, further comprising obtaining a measurement for a wavefront aberration for an eye, the optical element correcting the wavefront aberration when positioned in front of the eye.

47. The method of claim 46 in which the wavefront aberration comprises a low order aberration and a high order aberration.

48. The method of claim 47 in which the lens blank corrects at least a portion of the low order aberration.

49. The method of claim 46 in which the lens blank is selected from the group consisting of a plano blank, an optical blank with positive focusing power, an optical blank with negative focusing power, an optical blank with focusing power and cylindrical power, and an optical blank with progressive addition lens power.

50. The method of claim 38 in which the first polymer composition and the second polymer composition each individually comprise a type of polymer selected from the group consisting of poly(acrylate), poly(methylmethacrylate), poly(vinylidene chloride), polycarbonate, poly(vinyl butyral), poly(ethylene), ethylene/1-alkene copolymer, poly(ethylene terephthalate), poly(acrylonitrile), poly(butadiene), polystyrene, acrylonitrile-butadiene-styrene terpolymers, allyl diglycol carbonate polymer, poly(methyl pentene), polyamide, poly(2,6-dimethyl-1,4-phenyleneoxide), poly(vinyl methyl ether), epoxy polymer, thiolene polymer, silicone polymer, and copolymers thereof.

51. The method of claim 38 in which the first polymer composition comprises a metal.

52. The method of claim 51 in which the metal is in the form of nanoparticles having a refractive index of about 1.6 or higher.

53. The method of claim 52 in which the nanoparticles comprise TiO₂.

54. The method of claim 38 in which the first and second polymer pixels each comprise the same polymer type, the first polymer pixel comprising an amount of a metal that is different from the second polymer pixel.

55. The method of claim 38 in which at least one of the first polymer composition and the second polymer composition comprises a prepolymer.

56. The method of claim 55 which further comprises curing the prepolymer.

57. The method of claim 56 in which the curing comprises heating the first and second polymer pixels.

58. The method of claim 56 in which the curing comprises irradiating the first and second polymer pixels, the irradiation being selected from the group consisting of x-ray, ultraviolet, visible, infrared, microwave, millimeter wave, electron beam, ion beam and particle beam.

59. The method of claim 38 in which a surface treatment is applied to the substrate prior to step (a).

60. The method of claim 38 in which at least one of the first polymer composition and the second polymer composition comprises a solvent.

61. The method of claim 60 in which the solvent is present in an amount effective to adjust at least one property selected from the group consisting first polymer composition viscosity, second polymer composition viscosity, and volume ratio of the first polymer composition and the second polymer composition.

62. The method of claim 38 in which step (d) is conducted prior to, or simultaneously with, step (e).