# US 11,906,746 B2 · Light guide plate for augmented reality devices

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- Number: US 11,906,746 B2
- Document ID: US11906746B2
- Status: Granted
- Kind: B2
- Application number: 17/956,258
- Filed: 2022-09-29
- Published: 2023-04-06
- Granted: 2024-02-20
- Earliest claimed: 2021-09-30
- Assignees: Schott AG
- Applicants: Schott AG
- Inventors: Simone Monika Ritter; Bianca Schreder
- Web page: https://patentgrep.com/patent/US11906746B2

## CPC

- G02B 27/0172: {characterised by optical features}
- C03C 3/064: containing boron
- C03C 3/066: containing zinc
- C03C 3/21: containing titanium, zirconium, vanadium, tungsten or molybdenum
- C03C 3/253: containing germanium
- G02B 1/00: Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B 6/0065: {Manufacturing aspects; Material aspects}
- G02B 2027/0178: {Eyeglass type (eyeglass details G02C)}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- C03C: CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS

## Abstract

A light guide plate includes: an optical glass, the optical glass having a refractive index nd of at least 1.75 or of at least 1.80 and including Nb2O5 in an amount of at least 15 mol % and P2O5 in an amount of at least 19 mol %, the light guide plate having an internal transmission of at least 0.80 or of at least 0.90, measured at a wavelength of 440 nm and a sample thickness of 10 mm.

## Claims

### Claim 1

A light guide plate, comprising:
an optical glass, the optical glass having a refractive index nd of at least 1.75 or of at least 1.80 and including Nb2O5 in an amount of at least 15 mol % and P2O5 in an amount of at least 19 mol %, the light guide plate having an internal transmission of at least 0.80 or of at least 0.90, measured at a wavelength of 440 nm and a sample thickness of 10 mm, wherein the optical glass has a ratio of density to the refractive index nd of less than 2.2 or less than 2.1.

### Claim 2 (depends on 1)

The light guide plate according to claim 1, wherein a total amount of P2O5 and Nb2O5 in the optical glass is from 35 mol % to 75 mol %.

### Claim 3 (depends on 1)

The light guide plate according to claim 1, wherein the optical glass is essentially free of at least one of Bi2O3, GeO2, and WO3.

### Claim 4 (depends on 1)

The light guide plate according to claim 1, wherein the optical glass is essentially free of As2O3.

### Claim 5 (depends on 1)

The light guide plate according to claim 1, wherein the optical glass has an Abbe number νd of from 17 to 25.

### Claim 6 (depends on 1)

The light guide plate according to claim 1, wherein the optical glass comprises the following components in mol %:
Nb2O5
15-45
P2O5
17-40
B2O3
0-12
SiO2
0-5
R2O
4-40
RO
0-25
ZnO
0-5
TiO2
0-30
wherein R2O is at least one of Li2O, Na2O, K2O, and Cs2O, and wherein RO is at least one of MgO, CaO, SrO, and BaO.

### Claim 7 (depends on 1)

The light guide plate according to claim 1, wherein the optical glass comprises the following components in mol %:
Nb2O5
19-35
P2O5
19-30
B2O3
0-10
SiO2
0-3
R2O
5-37
RO
0-24
ZnO
0-4
TiO2
0-28

### Claim 8 (depends on 1)

The light guide plate according to claim 1, wherein the optical glass has the refractive index nd of at least 1.80 and less than 1.90 and comprises the following components in mol %:
Nb2O5
19-35
P2O5
19-30
B2O3
>0-10
SiO2
>0-3
R2O
10-40
RO
0-20
ZnO
0-4
TiO2
0-15

### Claim 9 (depends on 1)

The light guide plate according to claim 1, wherein the optical glass has the refractive index nd of at least 1.90 and comprises the following components in mol %:
Nb2O5
20-40
P2O5
20-40
B2O3
0-10
SiO2
0-3
R2O
3-22
RO
>0-30
ZnO
0-4
TiO2
>0-35

### Claim 10 (depends on 1)

The light guide plate according to claim 1, wherein the total thickness variation (TTV) of the light guide plate is less than 2 μm.

### Claim 11 (depends on 1)

The light guide plate according to claim 1, wherein the light guide plate has a surface roughness Rq in a range of from 0.1 nm to 5 nm.

### Claim 12

An augmented reality device, comprising:
a light guide plate, including:
an optical glass, the optical glass having a refractive index nd of at least 1.75 or of at least 1.80 and including Nb2O5 in an amount of at least 15 mol % and P2O5 in an amount of at least 19 mol %, the light guide plate having an internal transmission of at least 0.80 or of at least 0.90, measured at a wavelength of 440 nm and a sample thickness of 10 mm, wherein the optical glass has a ratio of density to the refractive index nd of less than 2.2 or less than 2.1.