# US 10,246,369 B2 · High index glasses

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- Number: US 10,246,369 B2
- Document ID: US10246369B2
- Status: Granted
- Kind: B2
- Application number: 15/223,840
- Filed: 2016-07-29
- Published: 2017-02-02
- Granted: 2019-04-02
- Earliest claimed: 2015-07-31
- Assignees: Corning Incorporated
- Applicants: Corning Incorporated
- Inventors: Jean Marc Galea; Thierry Michel Dugue
- Web page: https://patentgrep.com/patent/US10246369B2

## CPC

- C03C 3/112: containing fluorine
- G02B 27/017: {Head mounted}
- G02B 27/0172: {characterised by optical features}
- G02B 2027/0178: {Eyeglass type (eyeglass details G02C)}
- 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
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

A high refractive index glass is provided. The glass has a refractive index greater than or equal to 1.7 and less than about 0.1 wt. % As2O3. A head mounted wearable device having a light guide optical element including high refractive index glass is also provided.

## Claims

### Claim 1

A high refractive index glass comprising:
a refractive index greater than or equal to 1.7;
between about 38 wt. % and about 45 wt. % SiO2;
between about 15 wt. % and about 20 wt. % TiO2;
between about 6.0 wt. % and about 10 wt. % ZrO2;
between about 0.5 wt. % and about 4.0 wt. % La2O3;
between about 0.5 wt. % and about 4.0 wt. % Nb2O5;
between about 12 wt. % and about 19 wt. % BaO;
between about 0 wt. % and about 4.0 wt. % SrO;
between about 3.0 wt. % and about 8.0 wt. % CaO;
between about 0 wt. % and about 3.0 wt. % Li2O;
between about 2.0 wt. % and about 6.0 wt. % Na2O;
between about 4.0 wt. % and about 8.0 wt. % K2O;
between about 0 wt. % and about 3.0 wt. % Al2O3;
between about 0 wt. % and about 3.0 wt. % B2O3;
between about 0 wt. % and about 3.0 wt. % MgO;
between about 0 wt. % and about 3.0 wt. % ZnO;
between about 0 wt. % and about 2.0 wt. % of the combination of Sb2O3+F+Cl+Br; and
wherein the high refractive index glass is essentially free of As2O3,
wherein the combination of BaO+SrO+CaO is between about 17 wt. % and about 25 wt. %,
wherein the combination of Li2O+Na2O+K2O is between about 6.0 wt. % and about 10.5 wt. %, and
wherein the combination of Al2O3+B2O3+MgO+ZnO is between about 0 wt. % and about 12 wt. %.

### Claim 2 (depends on 1)

The glass of claim 1 comprising:
between about 0 wt. % and about 1.0 wt. % B2O3;
between about 0 wt. % and about 1.0 wt. % MgO; and
between about 0 wt. % and about 1.0 wt. % ZnO.

### Claim 3 (depends on 1)

The glass of claim 1 comprising between about 0 wt. % and about 1.0 wt. % of the combination of Sb2O3+F+Cl+Br.

### Claim 4 (depends on 1)

The glass of claim 1, wherein the glass is essentially free of the combination of Sb2O3+F+Cl+Br.

### Claim 5 (depends on 1)

The glass of claim 1, wherein the combination of Al2O3+B2O3+MgO+ZnO is between about 0 wt. % and about 1.0 wt. %.

### Claim 6 (depends on 1)

The glass of claim 1, wherein the glass is essentially free of the combination of Al2O3+B2O3+MgO+ZnO.

### Claim 7 (depends on 1)

The glass of claim 1, wherein the glass further comprises less than 5.0 wt. %. Ba(NO3)2.

### Claim 8 (depends on 1)

The glass of claim 1, wherein the glass further comprises less than 3.0 wt. %. NaF.

### Claim 9 (depends on 1)

The glass of claim 1 having a transmission of greater than 97%.

### Claim 10

A head mounted wearable device comprising:
an image forming device; and
a light guiding device, the light guiding device comprising a light guiding member comprising a high refractive index glass having a refractive index greater than or equal to 1.7, wherein the high refractive index glass is essentially free of As2O3.

### Claim 11 (depends on 10)

The head mounted wearable device of claim 10, wherein the light guiding member comprises at least one total reflection surface.

### Claim 12 (depends on 10)

The head mounted wearable device of claim 10, wherein the light guiding member further comprises an element having a light reflection property.

### Claim 13 (depends on 10)

The head mounted wearable device of claim 10, wherein light exiting the light guiding device is incident to at least one eye of a user.

### Claim 14 (depends on 10)

The head mounted wearable device of claim 10, wherein the high refractive index glass further comprises:
between about 38 wt. % and about 45 wt. % SiO2;
between about 15 wt. % and about 20 wt. % TiO2;
between about 6.0 wt. % and about 10 wt. % ZrO2;
between about 0.5 wt. % and about 4.0 wt. % La2O3;
between about 0.5 wt. % and about 4.0 wt. % Nb2O5;
between about 12 wt. % and about 19 wt. % BaO;
between about 0 wt. % and about 4.0 wt. % SrO;
between about 3.0 wt. % and about 8.0 wt. % CaO;
between about 0 wt. % and about 3.0 wt. % Li2O;
between about 2.0 wt. % and about 6.0 wt. % Na2O;
between about 4.0 wt. % and about 8.0 wt. % K2O;
between about 0 wt. % and about 3.0 wt. % Al2O3;
between about 0 wt. % and about 3.0 wt. % B2O3;
between about 0 wt. % and about 3.0 wt. % MgO;
between about 0 wt. % and about 3.0 wt. % ZnO; and
between about 0 wt. % and about 2.0 wt. % of the combination of Sb2O3+F+Cl+Br,
wherein the combination of BaO+SrO+CaO is between about 17 wt. % and about 25 wt. %,
wherein the combination of Li2O+Na2O+K2O is between about 6.0 wt. % and about 10.5 wt. %, and
wherein the combination of Al2O3+B2O3+MgO+ZnO is between about 0 wt. % and about 12 wt. %.

### Claim 15 (depends on 11)

The head mounted wearable device of claim 11, wherein the high refractive index glass comprises:
between about 0 wt. % and about 1.0 wt. % B2O3;
between about 0 wt. % and about 1.0 wt. % MgO; and
between about 0 wt. % and about 1.0 wt. % ZnO.

### Claim 16 (depends on 11)

The head mounted wearable device of claim 11, wherein the high refractive index glass comprises between about 0 wt. % and about 1.0 wt. % of the combination of Sb2O3+F+Cl+Br.

### Claim 17 (depends on 11)

The head mounted wearable device of claim 11, wherein the high refractive index glass is essentially free of the combination of Sb2O3+F+Cl+Br.

### Claim 18 (depends on 11)

The head mounted wearable device of claim 11, wherein the high refractive index glass comprises a combination of Al2O3+B2O3+MgO+ZnO is between about 0 wt. % and about 1.0 wt. %.

### Claim 19 (depends on 11)

The head mounted wearable device of claim 11, wherein the high refractive index glass is essentially free of the combination of Al2O3+B2O3+MgO+ZnO.

### Claim 20 (depends on 11)

The head mounted wearable device of claim 11, wherein the high refractive index glass has a transmission of greater than 97%.