Electronic device having selectively strengthened glass

Patent metadata

Field	Value
Publication number	US-9725359-B2
Application number	US-201113235090-A
Country	US
Kind code	B2
Filing date	Sep 16, 2011
Priority date	Mar 16, 2011
Publication date	Aug 8, 2017
Grant date	Aug 8, 2017

Abstract

Embodiments disclosed therein generally pertain to selectively strengthening glass. More particularly, techniques are described for selectively strengthening cover glass, which tends to be thin, for electronic devices, namely, portable electronic devices.

First claim

What is claimed is:

1. A method for assembling an electronic product comprising:
obtaining a cover glass having an outward facing surface and an inner facing surface;
selectively chemically strengthening one surface region of the outward facing surface of the cover glass differently than chemically strengthening an other surface region of the outward facing surface of the cover glass, the one surface region located at a periphery of the cover glass and having a width less than the width of the other surface region which is not at the periphery of the cover glass; and
subsequently attaching the cover glass to a housing for the electronic product such that the outward facing surface of the cover glass remains at least partially exposed,
wherein the one surface region and the other surface region are both different portions of the outward facing surface of the cover glass, and
wherein the enhanced strengthening of the one surface region comprises both: a) disposing the one surface region in a first heated solution for a first period of time, so as to allow at least one component of the first heated solution to diffuse into the one surface region, and b) thereafter disposing the one surface region in a second heated solution for a second period of time, so as to allow at least one component of the second heated solution to diffuse into the one surface region.

2. The method as recited in claim 1 wherein the selectively chemically strengthening comprises enhanced strengthening of the one surface region that is greater than strengthening of the other surface region.

3. The method as recited in claim 2 wherein the enhanced strengthening of the one surface region further comprises electric field assisted ion exchange strengthening.

4. The method as recited in claim 2 wherein the strengthening of the other surface region comprises disposing the other surface region in one of the first or the second heated solution for a period of time, so as to allow at least one component of the first or the second heated solution to diffuse into the other surface region.

5. The method as recited in claim 4 , wherein the other surface region is shielded when the one surface region is disposed in the other of the first or the second heated solution.

6. The method as recited in claim 2 wherein the cover glass includes at least one aperture, and wherein the other surface region comprises an aperture periphery region disposed around the at least one aperture in the cover glass.

7. The method as recited in claim 2 wherein: the one surface region comprises a peripheral edge region which is part of the outward facing region that extends from 2 to 5 millimeters inward from a peripheral edge of the cover glass; and the enhanced strengthening of the one surface region comprises enhanced strengthening of the peripheral edge region.

8. A method for assembling an electronic product comprising:
obtaining a display cover glass having front, back and side surfaces;
shielding a portion of the front surface of the display cover glass, the shielding providing the front surface of the display cover glass with at least one shielded portion and at least one unshielded portion, the shielded portion shielding a center region of the display cover glass and wherein the at least one unshielded portion comprises at least an edge extremity of the display cover glass, and wherein the at least one unshielded portion has a width between two to ten millimeters;
chemically strengthening the at least one unshielded portion of the front surface of the display cover glass;
arranging the display cover glass with a substantially full view display area that consumes a majority of a front surface of the electronic device, wherein the arranging avoids optically interfering with viewing of the substantially full view display area through the display cover glass; and
subsequently attaching the display cover glass to a housing for the electronic product.

9. The method as recited in claim 8 wherein strengthening comprises patterning the at least one shielded portion of the display cover glass.

10. The method as recited in claim 8 wherein strengthening comprises photolithographically patterning the at least one shielded portion of the display cover glass.

11. The method as recited in claim 8 wherein the chemically strengthening of the at least one unshielded portion of the display cover glass comprises chemically strengthening the edge extremity of the display cover glass.

12. The method as recited in claim 8 further comprising:
removing the shielding from the previously shielded portion of the display cover glass; and
applying a second chemical strengthening to the display cover glass, so as to chemically strengthen the previously shielded portion, and so as to further enhance strengthening of the already strengthened, previously unshielded portion.

13. A method for assembling an electronic product comprising:
chemically strengthening a cover glass defining an outward facing planar surface and an edge surface, including strengthening a peripheral portion of the outward facing planar surface and the edge surface;
further chemically strengthening the peripheral portion of the outward facing planar surface by:
shielding a portion of the cover glass, thereby defining:
a shielded portion shielding a center portion of the outward facing planar surface; and
an unshielded portion including the peripheral portion of the outward facing planar surface, and

applying an additional chemical strengthening to the cover glass, thereby providing enhanced strengthening of the peripheral portion as compared to the center portion; and
attaching the cover glass to a housing for the electronic product.

14. The method as recited in claim 13 wherein further chemically strengthening the peripheral portion of the outward facing planar surface comprises electric field assisted ion exchange strengthening of the peripheral portion.

15. The method as recited in claim 13 wherein when the cover glass is attached to the housing, the outward facing planar surface of the cover glass remains substantially exposed.

16. A method for assembling an electronic product comprising:
obtaining a cover glass having a single layer of glass, the cover glass including at least one aperture;
selectively chemically strengthening one surface region of the cover glass differently than chemically strengthening an other surface region of the cover glass, the one surface region positioned at a periphery of the cover glass and having a first width, the other surface region located at a non-periphery region of the cover glass; and
subsequently attaching the cover glass to a housing for the electronic product,
wherein when the cover glass is attached to the housing, an outer top surface of the cover glass remains substantially exposed, and
wherein the one surface region and the other surface region are both different portions of the outer top surface of the cover glass, and serve as at least a portion of a front surface of the housing for the electronic product, and
wherein the other surface region comprises an aperture periphery region disposed around the at least one aperture in the cover glass.

17. The method as recited in claim 16 wherein:
the one surface region comprises a peripheral edge region of the cover glass; and
the selectively chemically strengthening of the one surface region comprises enhanced strengthening of the peripheral edge region.

Assignees

• Weber Douglas J
• Apple Inc

Inventors

• Weber Douglas J

Classifications

• B32B17/06

  comprising glass as the main or only constituent of a layer, next to another layer of a specific {material} · CPC title

• C03C21/003 Primary

  under application of an electrical potential difference · CPC title

• B32B2457/20

  Displays, e.g. liquid crystal displays, plasma displays · CPC title

• C09K2323/00

  Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition · CPC title

• C03C21/005

  to introduce in the glass such metals or metallic ions as Ag, Cu · CPC title