Layered coatings for sapphire substrate
First Claim
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1. An electronic device, comprising:
- a window, comprising;
a sapphire substrate comprising a first surface and a second surface each having an array of surface defects, the second surface positioned opposite the first surface;
a first layer adhered to the first surface and the array of surface defects on the first surface to fill the surface defects, the first layer formed of one of alumina or silicon oxynitride at a first thickness; and
a second layer adhered to the second surface and the array of surface defects on the second surface, the second layer formed from one of alumina or silicon oxynitride at a second thickness that is less than the first thickness,wherein the second layer induces a compressive stress within the sapphire substrate.
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Abstract
A layered coating for a sapphire component is described herein. The sapphire component comprises one or more layers of alumina adhered to the surface of a sapphire member. At least the first layer of alumina adheres to the surface of the sapphire member filling all defects in the surface forming a pristine new layer that also provides isolation from damage.
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Citations
19 Claims
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1. An electronic device, comprising:
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a window, comprising; a sapphire substrate comprising a first surface and a second surface each having an array of surface defects, the second surface positioned opposite the first surface; a first layer adhered to the first surface and the array of surface defects on the first surface to fill the surface defects, the first layer formed of one of alumina or silicon oxynitride at a first thickness; and a second layer adhered to the second surface and the array of surface defects on the second surface, the second layer formed from one of alumina or silicon oxynitride at a second thickness that is less than the first thickness, wherein the second layer induces a compressive stress within the sapphire substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An electronic device, comprising:
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a housing; and a sapphire structure coupled to the housing, comprising; a sapphire layer having an array of surface defects; and first and second layers directly bonded to opposing surfaces of the sapphire structure to fill the surface defects and having distinct thicknesses, wherein; at least one of the first and second layers induces a compressive stress within the sapphire structure. - View Dependent Claims (11, 12, 13, 14, 15)
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16. An electronic device, comprising:
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a first sheet defined by a sapphire structure having first and second surfaces with an array of surface defects; a first layer positioned on the first surface and over the surface defects; and a second layer positioned on the second surface and over the surface defects, wherein; the first and second layers are formed from one of alumina or silicon oxynitride; and the second layer induces a compressive stress within the first sheet. - View Dependent Claims (17, 18, 19)
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Specification