Siloxane coating for a display lens assembly for mobile devices

Patent metadata

Field	Value
Publication number	US-9475947-B2
Application number	US-201414200381-A
Country	US
Kind code	B2
Filing date	Mar 7, 2014
Priority date	Mar 15, 2013
Publication date	Oct 25, 2016
Grant date	Oct 25, 2016

Abstract

Hard coatings are applied to a lens assembly. In an embodiment, the coated lens assembly ( 140 ) includes a first layer ( 106 B) including siloxane; a second layer ( 106 A) including siloxane, wherein the second layer has opposing sides and a hardness greater than the first layer; and a third layer ( 104 ) including an amorphous carbon selected from a diamond-like carbon and a diamond-like nano-composite. The first layer ( 106 B) and third layer ( 104 ) are positioned on opposing sides of the second layer ( 106 A). The third layer ( 104 ) has a hardness greater than the second layer ( 106 A).

First claim

What is claimed is:

1. A coating for a substrate comprising:
a siloxane layer comprising a siloxane-organic interpenetrating network contacting the substrate, the siloxane layer having a hardness greater than a hardness of the substrate;
another siloxane layer comprising a siloxane-organic interpenetrating network contacting the siloxane layer, the another siloxane layer having a hardness greater than the hardness of the siloxane layer, the siloxane layer and the another siloxane layer having a combined thickness of at least 20 microns; and
a diamond-like nano-composite layer comprising an amorphous carbon and a siloxane contacting the another siloxane layer, the diamond-like nano-composite layer having a hardness greater than the hardness of the another siloxane layer.

2. The coating of claim 1 , wherein the siloxane layer and the another siloxane layer have a combined thickness of less than 75 microns.

3. The coating of claim 1 , further comprising a hydrophobic treatment layer contacting the diamond-like nano-composite layer.

4. The coating of claim 1 , wherein the amorphous carbon is an amorphous hydrogenated diamond-like carbon.

5. The coating of claim 1 , wherein the diamond-like nano-composite layer has a hardness of 400 Vickers or greater.

6. The coating of claim 1 , wherein the diamond-like nano-composite layer has a thickness between 3 microns and 20 microns.

7. The coating of claim 1 , wherein the diamond-like nano-composite layer is applied to the siloxane layer by a chemical vapor deposition process.

8. The coating of claim 7 , wherein the chemical vapor deposition process is selected from ion beam plasma enhanced chemical vapor deposition and plasma enhanced chemical vapor deposition.

9. The coating of claim 1 , wherein the substrate is a lens.

10. The coating of claim 1 , wherein the substrate is a plastic.

11. The coating of claim 10 , wherein the substrate is selected from the group consisting of poly(methyl methacrylate), polycarbonate, and co-extrusions of poly(methyl methacrylate) and polycarbonate.

12. The coating of claim 1 , wherein the substrate is flexible.

13. The coating of claim 1 , wherein the siloxane layer comprises an interpenetrating network of a siloxane and an acrylic.

14. The coating of claim 1 , wherein the siloxane layer comprises from 25 wt.% to 50 wt.% siloxane.

15. The coating of claim 1 , wherein the another siloxane layer comprises an interpenetrating network of a siloxane and an acrylic.

16. The coating of claim 1 , wherein the another siloxane layer comprises from 10 wt.% to 25 wt.% siloxane.

17. The coating of claim 1 , wherein the siloxane layer has a hardness from 20 Vickers to 200 Vickers.

18. The coating of claim 1 , wherein the another siloxane layer has a hardness from 100 Vickers to 250 Vickers.

19. The coating of claim 1 , wherein the siloxane layer has a thickness from 20 microns to 50 microns.

20. The coating of claim 1 , wherein the another siloxane layer has a thickness from 5 microns to 25 microns.

Assignees

• Motorola Mobility Llc
• Google Technology Holdings LLC

Inventors

• Sirois Ernest J

Classifications

• Y10T428/24975

  No layer or component greater than 5 mils thick · CPC title

• G02B1/18

  Coatings for keeping optical surfaces clean, e.g. hydrophobic or photo-catalytic films (G02B1/16 takes precedence) · CPC title

• Y10T428/24983

  Hardness · CPC title

• G02B1/10

  Optical coatings produced by application to, or surface treatment of, optical elements (G02B1/08 takes precedence) · CPC title

• G02B1/105

  Physics · mapped topic