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US 2014/0193606 A1Published application
Sapphire component with residual compressive stress
AssigneeApple Inc.
InventorKelvin Kwong
Life of this patent
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Abstract
A method comprises shaping an aluminum oxide ceramic material into a component for an electronic device. The component has first and second major surfaces. A selected region of one or both of the first and second major surfaces is heated to an annealing temperature. The selected region is then cooled below the annealing temperature, so that residual compressive stress is generated in the selected region.
Claims23
A method comprising:
- shaping an aluminum oxide ceramic material into a sapphire component for an electronic device, the sapphire component having first and second major surfaces;
- heating a selected region of one or both of the first and second major surfaces of the sapphire component to an annealing temperature;
- and
- cooling the selected region of the sapphire component below the annealing temperature, such that residual compressive stress is generated in the selected region of the sapphire component.
1 more element
A cover glass component for an electronic device, the cover glass component comprising:
- a substantially single crystal aluminum oxide ceramic material having first and second major surfaces, the first and second major surfaces defining the cover glass component therebetween;
- a first portion of the cover glass component having a residual compressive stress induced therein;
- and
- a second portion of the cover glass component not having the residual compressive stress induced therein;
- wherein the first portion of the cover glass component in which the residual compressive stress is induced has greater residual compressive stress than the second portion of the cover glass component in which the residual compressive stress is not induced.
2 more elements
A mobile electronic device comprising:
- a display;
- a sapphire cover glass component adjacent the display, the sapphire cover glass component having a first major surface adjacent the display, oriented toward an interior of the device, and a second major surface opposite the display, oriented toward an exterior of the device;
- wherein a residual compressive stress is induced in a selected region of the sapphire cover glass component, such that the selected region has greater residual compressive stress than another region of the sapphire cover glass component in which the residual compressive stress is not induced.
Dependencies are inferred from the claim text.