Electronic device with a cover assembly having an adhesion layer
A cover assembly for an electronic device has a cover member including a glass ceramic material. An adhesion layer couples an interior coating to the cover member. The adhesion layer includes an oxide-based layer, such as a silicon oxide-based layer, and a coupling agent.
1. An electronic device comprising:
a display; and
an enclosure including a cover assembly, the cover assembly positioned over the display and comprising:
a cover member formed from a glass ceramic material;
a cosmetic masking layer positioned along an interior surface of the cover member and defining an opening positioned over at least a portion of the display; and
an adhesion layer including a silicon-based oxide and forming a bond between the glass ceramic material of the cover member and the cosmetic masking layer.
2. The electronic device of claim 1 , wherein:
the cosmetic masking layer includes a pigment dispersed within a polymer matrix; and
the polymer matrix is chemically bonded to the adhesion layer.
3. The electronic device of claim 1 , wherein:
the enclosure further includes a housing member that is coupled to the cover member by a coupling structure; and
the coupling structure includes the adhesion layer, the cosmetic masking layer, and an adhesive positioned between the cosmetic masking layer and the housing member.
4. The electronic device of claim 1 , wherein the adhesion layer comprises:
an oxide layer comprising the silicon-based oxide; and
a coupling agent which couples the oxide layer to the cosmetic masking layer.
5. The electronic device of claim 1 , wherein the silicon-based oxide is characterized by the formula SiO x and x is less than 2.
6. The electronic device of claim 1 , wherein:
the glass ceramic material comprises a lithium aluminosilicate glass ceramic; and
the silicon-based oxide further comprises aluminum.
7. The electronic device of claim 1 , wherein the glass ceramic material includes at least 50 percent by volume of a crystalline phase.
8. An electronic device comprising:
an enclosure defining an interior cavity of the electronic device, the enclosure including a cover assembly comprising:
a cover member comprising a glass ceramic material;
an opaque polymer-based layer along a peripheral interior surface of the cover member;
an oxide-based layer between the cover member and the opaque polymer-based layer; and
a coupling agent between the oxide-based layer and the opaque polymer-based layer, and
a display, at least a portion of the display positioned under the cover member and within the interior cavity.
9. The electronic device of claim 8 , wherein the coupling agent bonds with each of the oxide-based layer and the opaque polymer-based layer.
10. The electronic device of claim 9 , wherein the coupling agent forms a chemical bond with at least one of the oxide-based layer and the opaque polymer-based layer.
11. The electronic device of claim 9 , wherein the coupling agent is silane-based.
12. The electronic device of claim 9 , wherein:
the cover assembly defines an interphase region between the oxide-based layer and the opaque polymer-based layer; and
the coupling agent forms a distinct layer in the interphase region.
13. The electronic device of claim 8 , wherein the oxide-based layer is a silicon oxide-based layer.
14. The electronic device of claim 8 , wherein the oxide-based layer has a thickness from 2 nm to 30 nm.
15. An electronic device comprising:
an enclosure including a cover assembly, the cover assembly defining an exterior surface of the electronic device and comprising:
a glass ceramic cover member;
a polymeric layer positioned along an interior surface of the glass ceramic cover member; and
an adhesion layer comprising:
an oxide-based layer positioned between the glass ceramic cover member and the polymeric layer and directly adhered to the glass ceramic cover member; and
a coupling agent directly adhered to each of the oxide-based layer and the polymeric layer.
16. The electronic device of claim 15 , wherein:
the electronic device further comprises a display;
the polymeric layer defines a central opening positioned over at least a portion of the display;
the oxide-based layer spans the central opening defined by the polymeric layer;
the adhesion layer is transparent to visible light; and
the display is viewable through the central opening.
17. The electronic device of claim 15 , wherein the cover assembly defines a rear surface of the electronic device.
18. The electronic device of claim 15 , wherein the polymeric layer has a thickness from 10 microns to 100 microns.
19. The electronic device of claim 15 , wherein the coupling agent chemically bonds to the polymeric layer.
20. The electronic device of claim 15 , wherein:
the polymeric layer defines a first mounting surface; and
the enclosure further comprises:
a housing member defining a second mounting surface; and
an adhesive coupling the first mounting surface and the second mounting surface.