Apple Inc.
Spiral Grain Coatings for Glass Structures in Electronic Devices

Abstract:

An electronic device may include electrical components mounted within a housing. The device may have a display on a front face of the device that is covered with a glass structure and may have a glass structure that forms part of the housing on a rear face of the device. The housing may also have a sidewall formed from glass, metal, or other materials. The glass structures of the electronic device may have a surface that is covered with an antiscratch layer, an antireflection layer, or other coating. A spiral grain polycrystalline material may form a coating on the surface of the glass structures to help avoid fracturing of the glass structures when the electronic device is dropped or otherwise subjected to stress.