Device comprising optical elements of selected refractive index

Patent metadata

Field	Value
Publication number	US-11520150-B2
Application number	US-202017035241-A
Country	US
Kind code	B2
Filing date	Sep 28, 2020
Priority date	Sep 27, 2019
Publication date	Dec 6, 2022
Grant date	Dec 6, 2022

Abstract

The present disclosure relates to a device, in particular an augmented reality device. In particular, the disclosure relates to a device, a kit, a process for making the device, and a process for making a visual impression.

First claim

The invention claimed is:

1. A device comprising:
a. a grouping of x optical elements, wherein each of the optical elements has a front face and a back face, wherein the x optical elements are arranged in a stack from first to last in which the front face of an optical element faces the back face of the next optical element; and
b. a spacer region made of a material having a refractive index below 1.4 for vacuum wavelengths in the range from 400 to 760 nm located between each pair of adjacent optical elements,
wherein:
x is an integer that is at least 3,
the grouping of x optical elements comprises a first R-type optical element, a first G-type optical element and a first B-type optical element,
R 610 is the refractive index of the first R-type optical element for light of vacuum wavelength 610 nm;
R 760 is the refractive index of the first R-type optical element for light of vacuum wavelength 760 nm;
G 500 is the refractive index of the first G-type optical element for light of vacuum wavelength 500 nm;
G 610 is the refractive index of the first G-type optical element for light of vacuum wavelength 610 nm;
B 400 is the refractive index of the first B-type optical element for light of vacuum wavelength 400 nm;
B 500 is the refractive index of the first B-type optical element for light of vacuum wavelength 500 nm;
n 0 is the minimum selected from R 760 , G 610 and B 500 ;
δ is the difference between n 0 and the maximum selected from R 610 , G 500 and B 400 ;
n 0 is in the range from 1.550 to 2.500;
δ is equal to or less than 0.200.

2. The device according to claim 1 , wherein one or more of the following is satisfied:
i.) n 0 is in the range from 1.550 to less than 1.600 and 6 satisfies:
δ≤0.05(1+( n 0 −1.54)*10/6);

ii.) n 0 is in the range from 1.600 to less than 1.650 and 6 satisfies:
δ≤0.05(1+( n 0 −1.52)*10/6);

iii.) n 0 is in the range from 1.650 to less than 1.700 and 6 satisfies:
δ≤0.05(1+( n 0 −1.54)*10/6);

iv.) n 0 is in the range from 1.700 to less than 1.750 and 6 satisfies:
δ≤0.05(1+( n 0 −1.58)*10/6);

v.) n 0 is in the range from 1.750 to less than 1.800 and 6 satisfies:
δ≤0.05(1+( n 0 −1.34)*10/6);

vi.) n 0 is in the range from 1.800 to less than 1.850 and 6 satisfies:
δ≤0.05(1+( n 0 −1.40)*10/6);

vii.) n 0 is in the range from 1.850 to less than 1.900 and 6 satisfies:
δ≤0.05(1+( n 0 −1.43)*10/6);

viii.)no is in the range from 1.900 to less than 1.950 and 6 satisfies:
δ≤0.05(1+( n 0 −0.39)*10/6);

ix.) n 0 is in the range from 1.950 to less than 2.300 and 6 satisfies:
δ≤0.05(1+( n 0 −0.30)*10/6).

3. The device according to claim 1 , wherein one or more of the optical elements has a coating.

4. The device according to claim 1 , wherein the first R-type optical element is at least 50% by volume of a material A; the first G-type optical element is at least 50% by volume of a material B; and the first B-type optical element is at least 50% by volume of a material C; wherein A, B and C are different materials.

5. The device according to claim 1 , wherein the x optical elements comprise an optical element which comprises a material selected from the group consisting of: a glass, a ceramic, a crystal, a polymer and a combination of two or more thereof.

6. The device according to claim 1 , wherein the first R-type optical element is separated from the first G-type optical element by a distance RG, the first R-type optical element is separated from the first B-type optical element by a distance RB and the first G-type optical element is separated from the first B-type optical element by a distance GB, wherein RG, RB and GB are each less than 500 μm.

7. The device according to claim 3 , wherein one or more of the following is satisfied by one or more of the x optical elements:
a. A thickness of in the range from 10 to 1500 μm;
b. A radius of curvature greater than 600 mm;
c. An optical loss measured perpendicular to the front face of at most 25%;
d. A surface roughness of the optical element of less than 5 nm;
e. A surface roughness of the coating of less than 5 nm;
f. Maximum thickness variation over the area of the optical element of less than 5 μm;
g. A min-max local thickness variation over 75% of the total area of the optical element of less than 5 μm;
h. A warp of less than 350 μm;
i. A bow of less than 300 μm.

8. The device according to claim 1 , wherein one or more of the x optical elements comprises a coupler for coupling light into or decoupling light out of the optical element.

9. The device according to claim 1 , wherein one or more of the following criteria are satisfied:
a. n 0 is in the range from 1.550 to less than 1.600 and the value of the geometric mean of the integrated internal transmission in RGB-range divided by the average density is at least 0.263 g −1 ·cm 3 ;
b. n 0 is in the range from 1.600 to less than 1.650 and the value of the geometric mean of the integrated internal transmission in RGB-range divided by the average density is at least 0.260 g −1 ·cm 3 ;
c. n 0 is in the range from 1.650 to less than 1.700 and the value of the geometric mean of the integrated internal transmission in RGB-range divided by the average density is at least 0.261 g −1 ·cm 3 ;
d. n 0 is in the range from 1.700 to less than 1.750 and the value of the geometric mean of the integrated internal transmission in RGB-range divided by the average density is at least 0.230 g −1 ·cm 3 ;
e. n 0 is in the range from 1.750 to less than 1.800 and the value of the geometric mean of the integrated internal transmission in RGB-range divided by the average density is at least 0.220 g −1 ·cm 3 ;
f. n 0 is in the range from 1.800 to less than 1.850 and the value of the geometric mean of the integrated internal transmission in RGB-range divided by the average density is at least 0.200 g −1 ·cm 3 ;
g. n 0 is in the range from 1.850 to less than 1.900 and the value of the integrated internal transmission in RGB-range divided by the average density is at least 0.190 g −1 ·cm 3 ;
h. n 0 is in the range from 1.900 to less than 1.950 and the value of the integrated internal transmission in RGB-range divided by the average density is at least 0.180 g −1 ·cm 3 ;
i. n 0 is in the range from 1.950 to less than 2.000 and the value of the integrated internal transmission in RGB-range divided by the average density is at least 0.173 g −1 ·cm 3 .

10. A kit comprising two or more devices according to claim 1 .

11. A process for creating a visual impression comprising the following steps:
a. Providing a device according to claim 1 ;
b. Coupling a generated light image into the device;
c. Decoupling the generated light image out of the device.

12. A kit of x optical elements, each of the x optical elements comprising an R-type optical element, a G-type optical element and a B-type optical element,
wherein:
R 610 is the refractive index of the first R-type optical element for light of vacuum wavelength 610 nm;
R 760 is the refractive index of the first R-type optical element for light of vacuum wavelength 760 nm;
G 500 is the refractive index of the first G-type optical element for light of vacuum wavelength 500 nm;
G 610 is the refractive index of the first G-type optical element for light of vacuum wavelength 610 nm;
B 400 is the refractive index of the first B-type optical element for light of vacuum wavelength 400 nm;
B 500 is the refractive index of the first B-type optical element for light of vacuum wavelength 500 nm;
n 0 is the minimum selected from R 760 , G 610 and B 500 ;
δ is the difference between n 0 and th

Assignees

• Schott Ag

Inventors

• Ritter Simone Monika
• Carré Antoine
• Nass Peter
• Lentes Frank-Thomas

Classifications

• G02B27/0172 Primary

  characterised by optical features · CPC title

• G06F3/013

  Eye tracking input arrangements (G06F3/015 takes precedence) · CPC title

• G02B2027/0178

  Eyeglass type (eyeglass details G02C) · CPC title